JP7129698B2 - Wrapping stretch film and method for manufacturing the same, roll of stretch film for wrapping and method for winding the same - Google Patents

Description

Article 30, Paragraph 2 of the Patent Act applies Article 30, Paragraph 2 applies, October 24-November 8, 2017 Released at the new product exhibition held at Tsukasa Kasei Kogyo Co., Ltd.

The present invention relates to stretch films for packaging. In particular, by providing an identification color, it is easy to identify what kind of item is wrapped when wrapped around an item and used to pack or wrap the item. The present invention relates to a stretch film and its manufacturing method. Also. The present invention relates to a roll of such a stretch film for packaging, which can be easily peeled off and pulled out from the roll at the time of use, and a method for winding and manufacturing the same.

BACKGROUND ART Stretch film for packaging, which is wrapped around an article to pack and wrap the article, has been known for the purpose of preventing collapse of the load during transportation, preventing deformation, protecting the article, waterproofing, etc. (Patent Document 1).

A stretch film for packaging is a long film made of synthetic resin to a thickness (wall thickness) of about 6 to 30 μm. It is extremely thin with a thickness of about 6 to 30 μm, the length in the longitudinal direction is about 300 m to 500 m, and the size in the transverse direction, that is, the width is about 300 mm to 500 mm. is common.

Blow molding (inflation film forming method), T-die molding (cast film molding), and the like are used as the manufacturing method. In addition, there is also a manufacturing method in which a film formed by these methods is stretched in a secondary process to obtain a pre-stretched film, which is a thinned and toughened film.

As shown in FIGS. 1 and 2, such a long film is wound around a cylindrical roll core 2 and provided to the market as a stretch film roll 1 for packaging. A hollow cylindrical paper tube, plastic tube, or the like is used as the cylindrical core, and the outer diameter thereof is generally about 50 to 75 mm. The thickness of the winding layer 3 of the roll 1 of the stretch film for packaging wound around the cylindrical core 2 is usually at least about 10 mm.

As shown in FIG. 2, when the stretch film for packaging 4 is peeled off from the roll 1 of the stretch film for packaging and pulled out for use, the leading edge 5 in the longitudinal direction is fixedly grasped and stretched by applying tension. Pull out while (stretching) and wrap around the article. The surface of the stretch film for packaging is sticky, and the article is fixed by winding it while applying tension. Wrapping around an article while applying tension (stretching) prevents the film from coming loose due to the stickiness (does not stick to the article) of the stretch film for packaging that is laminated on the outer circumference of the article. The residual tension can be used to prevent cargo from collapsing.

The applicant of the present application has also proposed a roll of stretch film for packaging without a roll core and a method for producing the same (Patent Documents 2 and 3). The purpose is to eliminate shrinkage deformation during storage and deformation during transportation and handling, and to keep the transportation cost to the same level as the stretch film roll wound around a cylindrical core without being bulky. It was what I did.

Rolls of stretch film for packaging are used in hand-rolling work, in which workers hold the film in their hands and stretch it while winding it around an item, or in a machine such as a stretch wrapping machine, in which the film is stretched and wrapped around an item. Used for winding work.

A roll of stretch film for packaging that is hand-rolled is generally a long film having a thickness of 6 to 25 μm and a width of about 300 mm to 500 mm.

The rolls of stretch film for packaging used for machine winding work are conventional types that are not stretched greatly while being wound, long films with a thickness of 12 to 20 μm and a width of about 500 mm, and pre-stretched types that are greatly stretched before winding. In the case of , it is generally a long film having a thickness of 20 to 30 μm and a width of about 500 mm.

PP bands, PE tapes, etc. are conventionally used as materials for packing and so on. These packaging materials are generally colored red, blue, yellow, or the like. By using PP bands and PE tapes of different colors separately for each package to be packed and wrapped, it is possible to identify packages that are packed/wrapped with red bands, packages that are packed/wrapped with blue bands, For example, it becomes possible to sort and manage packages according to the color of the bands and tapes used for packaging.

Therefore, PP bands and PE tapes for packing and wrapping, which are colored in multiple standard colors such as red, blue, and yellow, are used in factories, production, quantity sorting, lot management, etc. .

On the other hand, as described above, the stretch film for packaging is wound around an article, etc., and is used when packing and wrapping the article, etc., and is wound around the article many times to be laminated many times. For this reason, it has generally been the case that stretch films for packaging that are colored entirely have not been used in the past. This is because there is a risk that the packed and wrapped goods may not be visible.

In the first place, since the stretch film for packaging is thin as described above, it is difficult to color it with a coloring agent or a pigment. Powder colorants and pigments have the property of agglomerating, and it is necessary to add a dispersant. However, if they are added to a thin layer, pinholes may form and the film may break during molding. For this reason, there is a problem that the film becomes thicker when trying to color it by mixing a coloring agent or a pigment.

In addition, in the extruder and mold for coloring thin films, it is necessary to replace the main raw material in a large amount to completely remove the pigment inside, which leads to a large amount of time and yield loss. As for production, there is a big problem.

Since the general equipment molds with a transparent width of 2 to 4m, if a colored line appears on a part of the surface, it will all be scrapped, resulting in a large amount of loss.

Due to these problems, conventional stretch films for packaging have generally been transparent as a whole.

Japanese Utility Model Laid-Open No. 63-123563 JP-A-2004-131169 Japanese Patent Application Laid-Open No. 2004-137073 JP-A-3-226414

"Thinking about hand binding materials and soft ropes tied by hand" (Kenichi Suzuki) "Packaging technology JPI Journal April 2016 Japan Packaging Institute pp.50-55"

Over the past 20 to 25 years, stretch film for packaging has been developed due to the technological development of linear low density polyethylene resin (LLDPE) used as the main raw material, and because it is easy to stretch and has excellent moldability. suddenly generalized.

Furthermore, due to the development of metallocene catalysts, LLDPE resins have come to be used in this technical field as resins with additional characteristics, also called m-LLDPE, and stretch films for packaging have been widely used in the market. It's becoming

As mentioned above, conventionally, stretch films for packaging were generally transparent as a whole. It would be convenient if the product could be provided with a color as a mark to be used in order to facilitate factory, production, quantity sorting, lot management, and the like.

In addition, stretch film for packaging has excellent stretchability, excellent toughness (strength), and resistance to tearing (excellent tear strength and puncture strength), so it is becoming increasingly thinner. I'm in.

In particular, due to the rapid increase in the amount used, there is a problem of disposal as industrial waste, environmental measures, and from the viewpoint of manufacturing costs, etc., in recent years, the thickness has been further reduced.

On the other hand, as the thickness of the film is reduced, the stretch film is sticky and difficult to peel off, making it difficult to remove and pull out the stretch film.

In addition, not only is it difficult to peel off due to the thinness of the film, but it also breaks when pulled out and used due to scratches or damage on the side edges of the roll of stretch film for packaging wound around the cylindrical core 2. easier to do.

In addition, in the case of a roll of stretch film for packaging wound around a cylindrical core, the width is as large as 300 mm to 500 mm compared to the diameter of the central core (about 50 to 75 mm). , as the thickness of the film is reduced, it takes time to pull it out completely.

Therefore, in the present invention, by providing a color for identification, it is easy to identify what kind of article is packed or wrapped when wrapping and wrapping the article by wrapping it around the article. The purpose is to provide a stretch film for packaging that becomes

Another object of the present invention is to propose a roll of stretch film for packaging, which can be easily peeled off and pulled out from the roll at the time of use, and a method for winding the same. .

[1]
Between two colorless and transparent ultra-thin first and second packaging stretch films, the first and second packaging stretch films are made of the same material as the first and second packaging stretch films. A stretch film for packaging in which an ultra-thin colored film extending in the longitudinal direction of the stretch film for packaging is sandwiched, wherein the colored portion extending in the longitudinal direction formed by the colored film extends in the longitudinal direction A stretch film for packaging formed in a part of the transverse direction perpendicular to each other.

[2]
The stretch film for packaging according to [1], wherein the colored part extends linearly in the longitudinal direction of the stretch film for packaging.

[3]
The stretch film for packaging according to [1], wherein the colored portion extends while bending in the longitudinal direction of the stretch film for packaging.

[4]
The stretch film for packaging according to any one of [1] to [3], wherein the colored portions are formed at a plurality of locations spaced apart in the lateral direction.

[5]
Between the colorless and transparent, ultra-thin first packaging stretch film and the colored, ultra-thin third packaging stretch film that is smaller in width in the lateral direction than the first packaging stretch film, the first It is made of the same material as the first and third stretch films for packaging, and is extremely thin and stretches in the longitudinal direction orthogonal to the transverse direction of the first and third stretch films for packaging. A stretch film for packaging in which a colored film having a width in the lateral direction smaller than the width in the lateral direction and exhibiting a color different from the color of the third stretch film for packaging is sandwiched,
A stretch film for packaging, wherein a colored portion extending in the longitudinal direction formed by the colored film is formed in a part of the third stretch film for packaging in the lateral direction.

[6]
The stretch film for packaging according to [5], wherein the colored part extends linearly in the longitudinal direction of the stretch film for packaging.

[7]
The stretch film for packaging according to [5], wherein the colored portion extends while bending in the longitudinal direction of the stretch film for packaging.

[8]
The stretch film for packaging according to any one of [5] to [7], wherein the colored portions are formed at a plurality of locations in the third stretch film for packaging that are spaced apart in the lateral direction.

[9]
The stretch film for packaging according to any one of [5] to [8], wherein the third stretch film for packaging is white.

[10]
A colorless and transparent ultra-thin first wrapping stretch film is attached to a fourth wrapping stretch film that is colored and has a width in the transverse direction smaller than that of the first wrapping stretch film and is ultra-thin. Laminated and partially welded between the first stretch film for packaging and the fourth stretch film for packaging to extend in the longitudinal direction formed by the fourth stretch film for packaging A stretch film for packaging, in which a colored portion is formed in a part of a lateral direction orthogonal to the longitudinal direction.

[11]
The stretch film for packaging of [10], wherein the colored part extends linearly in the longitudinal direction of the stretch film for packaging.

[12]
The stretch film for packaging according to [10], wherein the colored portion extends while bending in the longitudinal direction of the stretch film for packaging.

[13]
The stretch film for packaging according to any one of [10] to [12], wherein the colored portions are formed at a plurality of locations spaced apart in the lateral direction.

[14]
Between two colorless and transparent ultra-thin first and second packaging stretch films, the first and second packaging stretch films are made of the same material as the first and second packaging stretch films. A packaging stretch film in which an ultra-thin colored film extending in the longitudinal direction of the packaging stretch film is sandwiched,
The colored portion extending in the longitudinal direction formed by the colored film is formed in a part of the lateral direction orthogonal to the longitudinal direction,
A plurality of portions having different thicknesses continuous in the longitudinal direction of the first and second stretch films for packaging forming the stretch film for packaging are formed in the transverse direction of the first and second stretch films for packaging. Alternatively, a plurality of portions having different thicknesses intermittently formed in the longitudinal direction are formed in the transverse direction of the first and second stretch films for packaging.

[15]
The stretch film for packaging of [14], wherein the colored part extends linearly in the longitudinal direction of the stretch film for packaging.

[16]
The stretch film for packaging according to [14], wherein the colored portion extends while bending in the longitudinal direction of the stretch film for packaging.

[17]
The stretch film for packaging according to any one of [14] to [16], wherein the colored portions are formed at a plurality of locations spaced apart in the lateral direction.

[18]
Between the colorless and transparent, ultra-thin first packaging stretch film and the colored, ultra-thin third packaging stretch film that is smaller in width in the lateral direction than the first packaging stretch film, the first It is made of the same material as the first and third stretch films for packaging, and is extremely thin and stretches in the longitudinal direction orthogonal to the transverse direction of the first and third stretch films for packaging. A stretch film for packaging in which a colored film having a width in the lateral direction smaller than the width in the lateral direction and exhibiting a color different from the color of the third stretch film for packaging is sandwiched,
A colored portion extending in the longitudinal direction formed by the colored film is formed in a part of the third wrapping stretch film in the lateral direction,
A plurality of portions with different thicknesses continuous in the longitudinal direction of the stretch film for packaging are formed in the transverse direction of the stretch film for packaging, or the stretch films for packaging have different thicknesses intermittently formed in the longitudinal direction. A stretch film for packaging, wherein a plurality of portions are formed in the lateral direction of the stretch film for packaging.

[19]
The stretch film for packaging of [18], wherein the colored part extends linearly in the longitudinal direction of the stretch film for packaging.

[20]
The stretch film for packaging according to [18], wherein the colored part extends while bending in the longitudinal direction of the stretch film for packaging.

[21]
The stretch film for packaging according to any one of [18] to [20], wherein the colored portions are formed at a plurality of locations in the third stretch film for packaging that are spaced apart in the lateral direction.

[22]
The stretch film for packaging according to any one of [18] to [21], wherein the third stretch film for packaging exhibits white color.

[23]
A colorless and transparent ultra-thin first wrapping stretch film is attached to a fourth wrapping stretch film that is colored and has a width in the transverse direction smaller than that of the first wrapping stretch film and is ultra-thin. Laminated and partially welded between the first stretch film for packaging and the fourth stretch film for packaging to extend in the longitudinal direction formed by the fourth stretch film for packaging A stretch film for packaging in which a colored portion is formed in a part of a lateral direction perpendicular to the longitudinal direction,
A plurality of portions with different thicknesses continuous in the longitudinal direction of the stretch film for packaging are formed in the transverse direction of the stretch film for packaging, or the stretch films for packaging have different thicknesses intermittently formed in the longitudinal direction. A stretch film for packaging, wherein a plurality of portions are formed in the lateral direction of the stretch film for packaging.

[24]
The stretch film for packaging of [23], wherein the colored part extends linearly in the longitudinal direction of the stretch film for packaging.

[25]
The stretch film for packaging according to [23], wherein the colored part extends while bending in the longitudinal direction of the stretch film for packaging.

[26]
The stretch film for packaging according to any one of [22] to [25], wherein the colored portions are formed at a plurality of locations spaced apart in the lateral direction.

[27]
Between two colorless and transparent ultra-thin first and second packaging stretch films, the first and second packaging stretch films are made of the same material as the first and second packaging stretch films. Sandwiching process of sandwiching an ultra-thin colored film extending in the longitudinal direction of the stretch film for packaging,
Subsequently, stretching is performed in a uniaxial direction or biaxial direction to reduce the entire thickness of the colored film sandwiched between the first stretch film for packaging and the second stretch film for packaging. , a stretching step of stretching at least half or less of the total thickness of the first wrapping stretch film and the second wrapping stretch film;
A method for producing a stretch film for packaging, comprising a step of winding into a roll after a stretching step.

[28]
Between the colorless and transparent, ultra-thin first packaging stretch film and the colored, ultra-thin third packaging stretch film that is smaller in width in the lateral direction than the first packaging stretch film, the first It is made of the same material as the first and third stretch films for packaging, and is extremely thin and stretches in the longitudinal direction orthogonal to the transverse direction of the first and third stretch films for packaging. A sandwiching step of sandwiching a colored film having a width in the lateral direction smaller than the width in the lateral direction and exhibiting a color different from the color of the third stretching film for packaging;
Subsequently, stretching is performed in a uniaxial direction or a biaxial direction to reduce the entire thickness of the colored film sandwiched between the first stretch film for packaging and the third stretch film for packaging. , a stretching step of stretching to at least half or less of the total thickness of the first stretch film for packaging and the thickness of the third stretch film for packaging;
A method for producing a stretch film for packaging, comprising a step of winding into a roll after a stretching step.

[29]
A colorless and transparent ultra-thin first packaging stretch film is coated with a fourth packaging stretch film that is colored and has a width in the lateral direction smaller than that of the first packaging stretch film and is extremely thin. laminating,
subsequently partially welding the first stretch film for packaging and the fourth stretch film for packaging;
A method for producing a stretch film for packaging, comprising a step of subsequently winding the film into a roll.

[30]
Between two colorless and transparent ultra-thin first and second packaging stretch films, the first and second packaging stretch films are made of the same material as the first and second packaging stretch films. Sandwiching process of sandwiching an ultra-thin colored film extending in the longitudinal direction of the stretch film for packaging,
Subsequently, the first and second stretch films for packaging are stretched in a uniaxial direction or a biaxial direction, and the portions having different thicknesses continuous in the longitudinal direction are stretched by the first and second stretch films for packaging. A plurality of portions having different thicknesses formed intermittently in the longitudinal direction of the film are formed in the transverse direction of the first and second wrapping stretch films, and the first wrapping is formed. The total thickness of the colored film sandwiched between the stretch film for packaging and the second stretch film for packaging is equal to at least the thickness of the first stretch film for packaging and the thickness of the second packaging stretch film. Stretching step of stretching to less than half of the total thickness of the stretch film,
A method for producing a stretch film for packaging, comprising a step of winding into a roll after the stretching step.

[31]
Between the colorless and transparent, ultra-thin first packaging stretch film and the colored, ultra-thin third packaging stretch film that is smaller in width in the lateral direction than the first packaging stretch film, the first It is made of the same material as the first and third stretch films for packaging, and is extremely thin and stretches in the longitudinal direction orthogonal to the transverse direction of the first and third stretch films for packaging. A sandwiching step of sandwiching a colored film having a width in the lateral direction smaller than the width in the lateral direction and exhibiting a color different from the color of the third stretching film for packaging;
Subsequently, the first and third stretch films for packaging are stretched in a uniaxial direction or a biaxial direction, and the portions having different thicknesses continuous in the longitudinal direction of the stretch film for packaging are stretched in the first and third stretches for packaging. A plurality of portions having different thicknesses are formed in the transverse direction of the film, or formed intermittently in the longitudinal direction and formed in the transverse direction of the first and third stretch films for packaging, and the first The total thickness of the colored film sandwiched between the stretch film for packaging and the third stretch film for packaging is at least the thickness of the first stretch film for packaging and the thickness of the third packaging. A stretching process that stretches to less than half of the total thickness of the stretch film for
A method for producing a stretch film for packaging, comprising a step of winding into a roll after a stretching step.

[32]
A colorless and transparent ultra-thin first packaging stretch film is coated with a fourth packaging stretch film that is colored and has a width in the lateral direction smaller than that of the first packaging stretch film and is extremely thin. laminating,
subsequently partially welding the first stretch film for packaging and the fourth stretch film for packaging;
Subsequently, uniaxial or biaxial stretching is performed to form a plurality of portions with different thicknesses continuous in the longitudinal direction orthogonal to the lateral direction, or intermittently in the longitudinal direction. A stretching step of forming a plurality of portions having different thicknesses in the lateral direction,
A method for producing a stretch film for packaging, comprising a step of winding into a roll after the stretching step.

[33]
A roll of stretch film for packaging obtained by winding a stretch film for packaging into a roll,
The stretch film for packaging according to any one of [14] to [26] is
Between the films laminated to form a wound layer, the air layers continuous in the longitudinal direction of the stretch film for packaging are plural in the lateral direction of the stretch film for packaging, or intermittent in the longitudinal direction. A roll of stretch film for packaging, wherein a plurality of air layers are formed in the lateral direction of the stretch film for packaging.

[34]
The air layer includes a plurality of portions having different thicknesses in the transverse direction of the stretch film for packaging, continuously or intermittently in the longitudinal direction of the stretch film for packaging. The wrapping stretch film roll of [33] formed by

[35]
A method for winding a stretch film for packaging into a roll, comprising:
Between two colorless and transparent ultra-thin first and second packaging stretch films, the first and second packaging stretch films are made of the same material as the first and second packaging stretch films. Sandwiching process of sandwiching an ultra-thin colored film extending in the longitudinal direction of the stretch film for packaging,
Subsequently, the first and second stretch films for packaging are stretched in a uniaxial direction or a biaxial direction, and the portions having different thicknesses continuous in the longitudinal direction are stretched by the first and second stretch films for packaging. A plurality of portions having different thicknesses formed intermittently in the longitudinal direction of the film are formed in the transverse direction of the first and second wrapping stretch films, and the first wrapping is formed. The total thickness of the colored film sandwiched between the stretch film for packaging and the second stretch film for packaging is equal to at least the thickness of the first stretch film for packaging and the thickness of the second packaging stretch film. Stretching step of stretching to less than half of the total thickness of the stretch film,
After the stretching step, by winding into a roll, a plurality of air layers continuous in the longitudinal direction are formed between the films laminated to form a wound layer in the lateral direction, or in the longitudinal direction. A method for winding a roll of stretch film for packaging, comprising the step of creating a plurality of intermittently formed air layers in the lateral direction.

[36]
A method for winding a stretch film for packaging into a roll, comprising:
Between the colorless and transparent, ultra-thin first packaging stretch film and the colored, ultra-thin third packaging stretch film that is smaller in width in the lateral direction than the first packaging stretch film, the first It is made of the same material as the first and third stretch films for packaging, and is extremely thin and stretches in the longitudinal direction orthogonal to the transverse direction of the first and third stretch films for packaging. A sandwiching step of sandwiching a colored film having a width in the lateral direction smaller than the width in the lateral direction and exhibiting a color different from the color of the third stretching film for packaging;
Subsequently, the first and third stretch films for packaging are stretched in a uniaxial direction or a biaxial direction, and the portions having different thicknesses continuous in the longitudinal direction of the stretch film for packaging are stretched in the first and third stretches for packaging. A plurality of portions having different thicknesses are formed in the transverse direction of the film, or formed intermittently in the longitudinal direction and formed in the transverse direction of the first and third stretch films for packaging, and the first The total thickness of the colored film sandwiched between the stretch film for packaging and the third stretch film for packaging is at least the thickness of the first stretch film for packaging and the thickness of the third packaging. A stretching process that stretches to less than half of the total thickness of the stretch film for
After the stretching step, by winding into a roll, a plurality of air layers continuous in the longitudinal direction are formed between the films laminated to form a wound layer, or intermittent in the longitudinal direction. A method for winding and producing a roll of stretch film for packaging, comprising the step of causing a plurality of air layers formed in a horizontal direction to exist in the lateral direction.

[37]
A method for winding a stretch film for packaging into a roll, comprising:
A colorless and transparent ultra-thin first packaging stretch film is coated with a fourth packaging stretch film that is colored and has a width in the lateral direction smaller than that of the first packaging stretch film and is extremely thin. laminating,
subsequently partially welding the first stretch film for packaging and the fourth stretch film for packaging;
Subsequently, uniaxial or biaxial stretching is performed to form a plurality of portions with different thicknesses continuous in the longitudinal direction orthogonal to the lateral direction, or intermittently in the longitudinal direction. A stretching step of forming a plurality of portions having different thicknesses in the lateral direction,
After the stretching step, by winding into a roll, a plurality of air layers continuous in the longitudinal direction are formed between the films laminated to form a wound layer in the lateral direction, or in the longitudinal direction. A method for winding a roll of stretch film for packaging, comprising the step of creating a plurality of intermittently formed air layers in the lateral direction.

[38]
The stretching process in the uniaxial direction or the biaxial direction is performed to form a portion having a different thickness continuous in the longitudinal direction of the first and second stretch films for packaging. The step of forming a plurality in the lateral direction of the first and second stretch films for packaging includes forming a plurality of uneven portions continuous in the longitudinal direction of the first and second stretch films for packaging in the lateral direction of the first and second stretch films for packaging. A method for winding a roll of stretch film for packaging according to any one of [35] to [37].

[39]
The first and second stretch films for packaging are stretched in the uniaxial direction or biaxial direction, and the portions having different thicknesses in the longitudinal direction of the first and second stretch films for packaging are discontinued to obtain the stretch films for packaging. The step of forming a plurality of layers in the lateral direction is formed by embossing the entirety of the colored film sandwiched between the first stretch film for packaging and the second stretch film for packaging. The method for winding a roll of stretch film for packaging according to any one of [35] to [37].

[40]
The first and second stretch films for packaging are stretched in the uniaxial direction or biaxial direction to discontinue the portions having different thicknesses in the longitudinal direction of the first and second stretch films for packaging. In the step of forming a plurality in the lateral direction of the above, a stamping die of a predetermined shape is pressed against the entirety of the colored film sandwiched between the first stretch film for packaging and the second stretch film for packaging. The method for winding a roll of stretch film for packaging according to any one of [35] to [37].

[41]
The stretching process in the uniaxial direction or the biaxial direction is performed to stretch the first and second stretch films for packaging, which are continuous in the longitudinal direction and have different thicknesses, into the first and second stretch films for packaging. The step of forming a plurality of films in the lateral direction of the film includes partially stretching the entirety of the colored film sandwiched between the first stretch film for packaging and the second stretch film for packaging. The method for winding a roll of stretch film for packaging according to any one of [35] to [37].

[42]
The partial stretching process is
A pair of cylindrical stretching rollers each alternately provided with an outer peripheral ridge portion and an outer peripheral groove portion in the direction in which the central axis extends and which rotates about the central axis For the stretching rollers arranged in such a manner that the outer peripheral ridges engage with the outer peripheral grooves of the other cylindrical stretching roller,
The wrapping stretch of [41] is performed by inserting the entirety of the colored film sandwiched between the first wrapping stretch film and the second wrapping stretch film in the longitudinal direction. A winding manufacturing method for a roll of film.

[43]
The pair of cylindrical stretching rollers are arranged in the direction in which the entirety of the colored film sandwiched between the first stretch film for packaging and the second stretch film for packaging is inserted in the longitudinal direction. , arranged on the upstream side and the downstream side, and the cylindrical stretching roller on the downstream side rotates at a higher peripheral speed than the cylindrical stretching roller on the upstream side. Body winding manufacturing method.

According to the present invention, by providing an identification color, it is easy to identify what kind of article is packed or wrapped when wrapping the article around the article or the like to pack or wrap the article. It is possible to provide a stretch film for packaging that becomes

Also. It is possible to provide a roll of stretch film for packaging, which can be easily peeled off and pulled out from the roll at the time of use, and a method for winding the same.

FIG. 2 is a front view illustrating an example of a roll of a conventional wrapping stretch film. FIG. 2 is a partially omitted perspective view illustrating a state in which the film is peeled off from a roll of conventional stretch film for packaging and pulled out for use. (a) A front view illustrating an example in which the stretch film for packaging according to one embodiment of the present invention is rolled into a roll, (b) A state in which the film is peeled off and pulled out for use. Front view. (a) A front view illustrating an example in which the stretch film for packaging of another embodiment of the present invention is rolled into a roll, (b) A state in which the film is peeled off and pulled out for use. Front view for explanation. (a) A front view illustrating an example in which the stretch film for packaging according to still another embodiment of the present invention is rolled into a roll, (b) A state in which the film is peeled off and pulled out for use. Front view for explaining. BRIEF DESCRIPTION OF THE DRAWINGS The conceptual diagram which abbreviate|omitted one part explaining the process which manufactures the stretch film for packaging of one Embodiment of this invention. (a) A front view illustrating an example in which the stretch film for packaging according to still another embodiment of the present invention is rolled into a roll, (b) A state in which the film is peeled off and pulled out for use. The perspective view which abbreviate|omitted one part explaining. (a) A front view illustrating an example in which the stretch film for packaging according to still another embodiment of the present invention is rolled into a roll, (b) A state in which the film is peeled off and pulled out for use. The perspective view which abbreviate|omitted one part explaining. 7 and 8 of the embodiment of the present invention, partly explaining the structure of the outer peripheral (outer diameter) side of the stretch film for packaging that is laminated to form a wound layer The schematic sectional drawing which abbreviate|omitted. FIG. 2(a) is a conceptual diagram illustrating steps of an embodiment of a method for producing another stretch film for packaging of the present invention and a method for winding a roll of a stretch film for packaging of the present invention. is a plan view, and (b) is a corresponding side view. One embodiment of the method for producing another stretch film for packaging of the present invention and one of the pair of stretching rolls employed in the stretching step in one embodiment of the method for winding a roll of the stretch film for packaging of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS The figure which abbreviate|omits one part and demonstrates embodiment. (a), (b), and (c) are an embodiment of the method for producing another stretch film for packaging of the present invention and an embodiment of the method for winding a roll of the stretch film for packaging of the present invention. 4 is a diagram illustrating an embodiment of a pair of stretching rolls in a case where the stretching step is performed by embossing, with some parts omitted. FIG. (a) and (b) show another embodiment of the method for producing a stretch film for packaging of the present invention and an embodiment of the method for producing a roll of a stretch film for packaging of the present invention, in which the stretching step is FIG. 4 is a diagram illustrating an embodiment of a pair of stretching rolls in the case of embossing gear processing, with some parts omitted. (a) A front view illustrating an example in which the stretch film for packaging of another embodiment of the present invention is rolled into a roll, (b) A state in which the film is peeled off and pulled out for use. front view. (a) A front view illustrating an example in which a stretch film for packaging according to another embodiment of the present invention is rolled into a roll, (b) Explaining a state in which the film is peeled off and pulled out for use. front view. (a) A front view illustrating an example in which the stretch film for packaging of still another embodiment of the present invention is rolled into a roll, (b) A state in which the film is peeled off and pulled out for use. Front view for explanation. The conceptual diagram which abbreviate|omitted one part explaining the process of manufacturing the stretch film for packaging of other embodiment of this invention. A colorless and transparent ultra-thin first packaging stretch film is laminated with a fourth packaging stretch film that is colored and has a width in the transverse direction smaller than that of the first packaging stretch film and is extremely thin. FIG. 10 is a conceptual diagram for explaining the welding process in the case of manufacturing the stretch film for packaging of the present invention by applying a heating medium from above to partially weld a fourth stretch film for packaging that is colored. FIG. 4 is a conceptual diagram illustrating an example of the structure of a heating roller used in the partial welding process; Sectional drawing which abbreviate|omits one part explaining a partial welding process.

(Embodiment 1 of stretch film for packaging)
3(a) and 3(b) show the stretch film 54 for packaging of this embodiment.

Ultra-thin (for example, about 6 to 30 μm thick), with a length of about 300 m to 500 m in the longitudinal direction, and a width of 300 mm to 500 mm in the lateral direction, which is the direction perpendicular to the longitudinal direction. FIG. 3(a) shows a roll 51 of stretch film for wrapping, which is obtained by winding a stretch film 54 for wrapping around a cylindrical hollow winding core 2 into a roll shape.

In the stretch film for packaging 54 of this embodiment, the colored portion 52 extending in the longitudinal direction of the stretch film for packaging 54 is formed in a part of the lateral direction orthogonal to the longitudinal direction. The portion other than the colored portion 52 is colorless and transparent like the conventional wrapping stretch film.

As shown in FIG. 3(b), the leading edge 55 in the longitudinal direction is fixedly grasped, the stretch film for packaging 54 is peeled off from the roll 51 of the stretch film for packaging, pulled out for use, and wrapped around an article or the like. When the article or the like is packed or wrapped by using the colored portion 52 for identification, it is possible to identify what kind of article is packed or wrapped.

At this time, the colored portion 52 is formed only on a part of the stretch film for packaging 54 in the transverse direction, and the portion other than the colored portion 52 is colorless and transparent. Therefore, even if the article is wound many times and laminated many times and packed and wrapped, the packed and wrapped article is passed through the colorless and transparent part other than the colored part 52. can be viewed from the outside.

In the embodiment shown in FIG. 3, the colored portion 52 extends linearly in the longitudinal direction of the stretch film 54 for packaging and is formed in the central portion of the long stretch film 54 in the lateral direction. The colored portion 52 may be formed on the edge side of the long stretch film 54 in the lateral direction, as long as it can be used as an identification color when the product is wrapped and wrapped around the product.

In the embodiment shown in FIG. 5 , the colored portion 56 extends while bending in the longitudinal direction of the stretch film 54 for packaging, and is formed in the central portion of the long stretch film 54 in the transverse direction. The colored portion 56 may be formed on the edge side in the lateral direction of the long stretch film 54, as long as it can be used as an identification color when the product is wrapped and wrapped around the product.

In the embodiment shown in FIG. 4, the colored portions 53a and 53b are formed at a plurality of locations (two locations) spaced apart in the lateral direction of the long stretch film 54 . In the embodiment shown in FIG. 4, colored portions 53a and 53b extending linearly in the longitudinal direction of the stretch film 54 for packaging are formed. Instead of being linear, as shown in FIG. 5, two colored portions extending while bending in the longitudinal direction of the stretch film 54 for packaging are formed at a plurality of locations spaced apart in the lateral direction of the long stretch film 54. It can also be in the form of

The stretch film for packaging 54 of this embodiment is composed of two colorless and transparent ultra-thin first and second stretch films for packaging. The stretch film for packaging is made of the same material as the first and second stretch films for packaging and is formed by sandwiching an ultra-thin colored film extending in the longitudinal direction of the first and second stretch films for packaging. Colored portion 52 shown in FIGS. 53a, 53b and 56 are formed. As the color of the colored film, various colors such as red, blue, green, etc., which can function as an identification color can be used.

The two colorless and transparent ultra-thin first packaging stretch films, the second packaging stretch film, and the colored films to be the colored parts 52, 53a, 53b, and 56 are made of the same material, for example, all , linear low-density polyethylene resin (LLDPE), m-LLDPE and resin, etc., which are used in the manufacture of conventional stretch films for packaging.

As described above, when the width of the stretch film for packaging 54 is about 300 mm to 500 mm, the width of the colored films to be the colored portions 52, 53a, 53b, and 56 should For example, the horizontal width can be set to about 80 to 100 mm so that it is formed in a part of the direction and can play a role as an identification color.

Instead of the above, the stretch film for packaging 54 of this embodiment is a colorless and transparent sheet of an ultra-thin first stretch film for packaging, which is colored and has a width in the transverse direction that is greater than that of the first stretch film for packaging. A fourth packaging stretch film with a small and extremely thin thickness is laminated, and the first packaging stretch film and the fourth packaging stretch film are partially welded, so that the It is also possible to produce a form in which the colored portion extending in the longitudinal direction formed by the fourth stretch film for packaging is formed in a part of the lateral direction orthogonal to the longitudinal direction. In the above, the lamination of the fourth stretch film for packaging on the first stretch film for packaging can be, for example, in the form of laminating the fourth stretch film for packaging on the first stretch film for packaging.

A colorless and transparent ultra-thin first packaging stretch film is coated with a fourth packaging stretch film that is colored and has a width in the lateral direction smaller than that of the first packaging stretch film and is extremely thin. After lamination, a heating medium is applied from above to partially weld a colored fourth wrapping stretch film. This partial welding is carried out partially in the lateral direction, so that partial welding is performed to such an extent that it does not come off when stretched and used.

For example, if the colored fourth wrapping stretch film has a lateral size (width) of 50 mm, about 5 mm width is melted and continuously fused in the longitudinal direction.

(Embodiment 2 of stretch film for packaging)
FIGS. 14(a) and 14(b) show the stretch film 154 for packaging of this embodiment.

Ultra-thin (for example, about 6 to 30 μm thick), with a length of about 300 m to 500 m in the longitudinal direction, and a width of 300 mm to 500 mm in the lateral direction, which is the direction perpendicular to the longitudinal direction. A roll 151 of a stretch film for packaging is shown in which a stretch film 154 for packaging of about 100 mm is wound around a cylindrical hollow winding core 2 in a roll shape.

In the stretch film for packaging 154 of this embodiment, the first colored portion 153 extending in the longitudinal direction of the stretch film for packaging 154 is formed in a part of the stretch film for packaging 154 in the lateral direction perpendicular to the longitudinal direction of the stretch film for packaging 154 . In addition, the second colored portion 152 extending in the longitudinal direction of the stretch film for packaging 154 is formed in a part of the lateral direction orthogonal to the longitudinal direction of the first colored portion 153 extending in the longitudinal direction of the stretch film for packaging 154. There is.

The color of the second colored portion 152 is different from the color of the first colored portion 153 . For example, the color of the first colored portion 153 is white, and the color of the second colored portion 152 is red. This allows for better color contrast. Portions other than the first colored portion 153 and the second colored portion 152 are colorless and transparent, like conventional stretching films for packaging.

As shown in FIG. 14(b), the front end side 55 in the longitudinal direction is fixedly grasped, the stretch film for packaging 154 is peeled off from the roll of stretch film for packaging 151, pulled out for use, and wrapped around an article or the like. When the article or the like is packed or packaged by using the first colored portion 153 and the second colored portion 152 for identification, it is possible to identify what kind of article is packed or wrapped. can.

At this time, the second colored portion 152 is formed only in a part of the first colored portion 153 in the lateral direction, and the first colored portion 153 is formed in the lateral direction of the stretch film 54 for packaging. only partially formed. Portions other than the first colored portion 153 and the second colored portion 152 are colorless and transparent. Therefore, even when the article is wound many times and laminated many times to pack and wrap the article, the colorless transparent portion other than the first colored portion 153 and the second colored portion 152 is used. , the packed and wrapped goods can be visually recognized from the outside.

Also, the color of the second colored portion 152 is different from the color of the first colored portion 153. For example, the color of the first colored portion 153 is white and the color of the second colored portion 152 is white. The color is red. Thereby, the color of the second colored portion 152 formed in a part of the first colored portion 153 in the lateral direction can be clearly visually recognized.

Therefore, the color of the second colored portion 152 makes it easier to identify an article wrapped with the wrapping stretch film 154 and packed.

In the embodiment shown in FIG. 14, the first colored portion 153, in which the second colored portion 152 is partially formed in the lateral direction, extends linearly in the longitudinal direction of the stretch film 154 for packaging. It is formed in the central portion of the length stretch film 154 in the transverse direction. The first colored portion 153, in which the second colored portion 152 is partially formed in the lateral direction, can be used as an identification color when the product is used for packing and packaging by wrapping it around the product. It may be formed on the edge side in the transverse direction of the length stretch film 154 .

Although not shown, like the colored portions 53a and 53b shown in FIG. 4, the second colored portion 152 extending in the longitudinal direction is formed in a part in the transverse direction. 153 can also be formed to extend in the longitudinal direction at a plurality of locations spaced apart in the lateral direction of stretch film 154 for packaging.

Alternatively, although not shown, a first colored portion 153 in which a second colored portion 152 extending in the longitudinal direction is formed partially in the lateral direction like the colored portion 56 shown in FIG. Alternatively, the stretch film for packaging may be bent and stretched in the longitudinal direction.

In the embodiment shown in FIG. 14, the second colored portion 152 is formed in the transverse direction central portion of the first colored portion 153 linearly extending in the longitudinal direction of the stretch film 154 for packaging. Since the color of the first colored portion 153 and the color of the second colored portion 152 are different, as described above, when the stretch film for packaging 154 is wrapped around the article and the article is packed, the article is packed. Since it facilitates identification of the article, the second colored portion 152 extends linearly in the longitudinal direction of the stretch film 154 for packaging. It may be formed on the edge side.

Alternatively, although not shown, a second colored portion 152 extending in the longitudinal direction in a portion of the first colored portion 153 in the transverse direction, like the colored portion 56 shown in FIG. A part of one colored portion 153 in the transverse direction may be bent and extended in the longitudinal direction of the stretch film for packaging.

15 and 16 show that the second colored portion 152 formed in a portion of the first colored portion 153 linearly extending in the longitudinal direction in the stretch film for packaging 154 in the lateral direction is shown in FIG. 1 is formed in a manner different from the embodiment of .

In the embodiment shown in FIG. 15, the second colored portions 153a, 153a extending in the longitudinal direction of the long stretch film 154 are separated from each other in the lateral direction of the first colored portion 153 extending in the longitudinal direction of the long stretch film 154. It is formed in a plurality of vacant places (two places).

In the embodiment shown in FIG. 16, the second colored portion 156 extending in the longitudinal direction of the long stretch film 154 extends while bending in the longitudinal direction of the first colored portion 153 extending in the longitudinal direction of the long stretch film 154. ing.

The wrapping stretch film 154 of this embodiment includes a colorless and transparent, ultra-thin first wrapping stretch film, and a colored, ultra-thin third wrapping film having a smaller width in the transverse direction than the first wrapping stretch film. (the stretch film that constitutes the first colored portion 153) is the same material as the first and third packaging stretch films, and the first and third packaging stretch films are Extending in the longitudinal direction perpendicular to the transverse direction, being extremely thin, having a width in the transverse direction smaller than the width in the transverse direction of the third stretch film for packaging, and having the same color as the third stretch film for packaging. is a stretch film for packaging in which colored films exhibiting different colors (stretch films constituting the second colored portion 152) are sandwiched. The colored portion extending in the longitudinal direction formed by the colored film (the stretch film forming the second colored portion 152) is the third wrapping stretch film (the stretch film forming the first colored portion 153). It is a stretch film for packaging formed in a part of the lateral direction in.

Both the colorless and transparent ultra-thin first stretch film for packaging and the third stretch film for packaging (stretch film constituting the first colored portion 153) are colored films (constituting the second colored portion 152 Stretch film) shall also be of the same material, such as linear low density polyethylene resin (LLDPE) or m-LLDPE and resin, etc., which are used in the manufacture of conventional stretch film for packaging. can be done.

(Embodiment 1 of method for producing stretch film for packaging)
The stretch film for packaging described in Embodiment 1 of the stretch film described above can be produced using an apparatus conventionally used for producing stretch films for packaging. An example will be described with reference to FIG.

(Pinching process)
A raw film 61 of a packaging stretch film 71 (made of LLDPE and having a thickness of 17 microns) before being stretched is attached to a raw film holder 65 equipped with a braking device 63 .

A raw film 67 of an ultra-thin colored film 73 (made of LLDPE and having a thickness of 17 microns) before being stretched is attached to a raw film holder 69 equipped with a brake device 68 .

A raw film 62 of a packaging stretch film 72 (made of LLDPE and having a thickness of 17 microns) before being stretched is attached to a raw film holder 66 equipped with a braking device 64 .

Colored film unwound from the original film holder 69 is placed between the packaging stretch film 71 unwound from the original film holder 65 and the packaging stretch film 72 unwound from the original film holder 66. 73 is sandwiched.

The stretch film for packaging 72 used as a base has a width that takes into account that the stretch film for packaging manufactured through the stretching process described later has a width of about 300 mm to 500 mm. Since the wrapping stretch film 71 plays a covering role by sandwiching the colored film 73 between the wrapping stretch film 72 and the wrapping stretch film 72, a film having a width of, for example, about 100 mm is used in the above case. Since the colored film 73 is sandwiched between the wrapping stretch film 72 having such a width and the wrapping stretch film 71, the width is at least smaller than the width of the wrapping wrapping stretch film 71, for example, the width About 50 mm is used.

(Stretching process)
The entirety of the colored film 73 sandwiched between the packaging stretch film 71 and the packaging stretch film 72 is pressed by a conventionally known roll-shaped compression roll 70 and stretched uniaxially or biaxially. be. Here, for example, a pair of stretching rolls illustrated in FIG. 10 with reference numeral 25 and described in the embodiments described later can be used. In this way, the thickness of the whole (packaging stretch film 74) in which the colored film 73 is sandwiched between the wrapping stretch film 71 and the wrapping stretch film 72 is at least the thickness of the wrapping stretch film 71 and the wrapping. It is stretched to half or less of the total thickness of the stretch film 72 for use.

(winding process)
Subsequently, it is wound into a roll by a winding roll (not shown).

In the stretching process described above, for example, by stretching 3 times in the longitudinal direction and stretching 1.5 times in the transverse direction perpendicular to this, the thickness of the whole (packaging stretch film 74) is 9 microns. 3, a stretch film 54 for packaging as shown in the figure can be manufactured.

Since the stretch film for packaging 74 of this embodiment is manufactured through the stretching process described above, it is desirable that the stretch film for packaging 71, the stretch film for packaging 72, and the colored film 73 have the same elongation properties.

For example, as described above, the wrapping stretch film 71, the wrapping stretch film 72, and the colored film 73 can be made of the same material.

Even in such a laminated structure in which a colored film forming a colored portion is sandwiched between two stretch films for packaging, it can be stretched uniaxially or biaxially to form two wrapping films. The thickness of the laminate structure in which the colored film forming the colored portion is sandwiched between the stretch films for packaging is stretched to be half or less of the total thickness of at least two stretch films for packaging.

Such stretching improves the strength per unit. Therefore, it is also possible to make the structure thinner.

In addition, when stretching a laminated structure in which a colored film forming a colored portion is sandwiched between two stretch films for packaging, in an embodiment in which a roll is pressed with a pressure roll, two wrapping films can be obtained. The stretch film for use and the colored film that forms the colored portion sandwiched therebetween are completely adhered to each other, and are not peeled off.

Both the unstretched packaging stretch film 71 attached to the original film holder 65 and the unstretched packaging stretch film 72 attached to the original film holder 66 are conventionally known packaging stretch films. Therefore, the surface is sticky.

Therefore, by attaching the colored film 73 forming the colored portions 52, 53a, 53b, 56 as they are, it is possible to obtain a wrapping stretch film having colored portions.

That is, instead of manufacturing the packaging stretch film 54 shown in FIG. The stretching film for packaging 54 shown in FIG. 3 can also be manufactured by going through the "sandwiching process" and then the "winding process" by utilizing the stickiness of the surface of the stretch film.

In the above, the colored film 73 is sandwiched between the wrapping stretch film 71 and the wrapping stretch film 72, and is stretched so as not to come off during use. We were manufacturing a stretch film for wrapping in the form. Instead of this, a colorless and transparent first ultra-thin wrapping stretch film is attached to a fourth wrapping stretch film that is colored and has a smaller width in the lateral direction than the first wrapping stretch film and is ultra-thin. A stretch film for packaging is laminated, and a heating medium is applied from above to partially weld a fourth colored stretch film for packaging to form the stretch film for packaging of the embodiment shown in FIGS. 3 to 5. can also be manufactured. In this case, for example, the following manufacturing steps are adopted.

(Lamination process)
A raw film 62 of a packaging stretch film 72 (made of LLDPE and having a thickness of 12 microns) before being stretched is attached to a raw film holder 66 equipped with a braking device 64 (FIG. 18).

A raw film 80 of a colored packaging stretch film 83 (made of LLDPE and having a thickness of 10 microns) before being stretched is attached to a raw film holder 82 equipped with a braking device 81 (FIG. 18).

The width in the lateral direction of the colored stretch film for packaging 83 is smaller than the width in the lateral direction of the stretch film for packaging 72 . For example, the width of the colorless and transparent wrapping stretch film 72 in the lateral direction is 300 mm, and the width of the colored wrapping stretch film 83 in the lateral direction is 50 mm.

The stretch film for packaging 72 and the stretch film for packaging 83 unwound from the original film holders 66 and 82 are guided to the heat-sealing roll portion via the guide roll 70 and laminated together.

(Partial welding (welding) process)
In the embodiment shown in FIG. 18, the heat-sealing roll section includes a lower roll 85 (for example, roll outer diameter: 150 mm) and an upper roll 84, and pressure rolls 86 and 87 are arranged downstream of this. It is

The lower roll 85 is a rubber roll or a metal roll that is driven by a motor (not shown), whose rotational speed is controlled, and whose surface is covered with a rubber roll. The rotation speed is, for example, speed: 100 to 300 m/min.

The upper roll 84 is a heating element that rotates along the top (tangent line) of the lower roll 85, and is a metal roll whose surface is heated. The upper roll 84 is a free heat roll that is not driven by a motor, and can be lifted by an air cylinder 93 (FIG. 19) to be opened when heat welding is not performed.

The upper roll 84 rotated by the contacting lower roll 85 without being driven by a motor or the like is adhered to the colorless and transparent packaging stretch film 72, laminated and partially fused as described above. When the width of the colored stretch film 83 for packaging is 50 mm in the transverse direction, a roll width of 50 mm can be adopted correspondingly. The outer diameter is 60-100 mm.

The upper roll 84 illustrated in FIG. 19 has a plurality of cartridge heaters 88 embedded therein. In the illustrated embodiment, 300 w cartridge heaters 88 are embedded at two circumferentially spaced locations and two laterally spaced locations each, for a total of four locations.

The cartridge heater 88 is configured to adjust the surface temperature of the contact portion with the colored wrapping stretch film 83 via the temperature sensor 89 . In FIG. 19, a bearing 90 is provided inside, and in order to protect the bearing 90 from heat, a heat insulating material 91 is sandwiched and a heating metal medium 92 incorporated in a cartridge heater 88 surrounds the structure. Metallic copper (Cu), brass, or the like with good thermal conductivity is used for the heating metal medium 92 .

It is desirable to narrow the portion where the cartridge heater 88 contacts the surface of the colored stretch film 83 for packaging, and to narrow the contact width for the purpose of improving heat conduction. As shown in the figure, when the two cartridge heaters 88 are arranged at two locations spaced apart in the circumferential direction, respectively, the width of the welded portion is 3 to 5 mm, for example, and sufficient peeling is required. can be fused without

In addition, when one cartridge heater 88 is arranged at each of two locations spaced apart in the circumferential direction, if the width of the colored stretch film for packaging 83 in the lateral direction is 50 mm, the width of the upper roll 84 If a cartridge heater 88 with a width of 10 mm is provided in the central portion in the direction, fusion bonding can be performed without sufficient peeling.

The pressure rolls 86 and 87 are rolls for maturing fusion. For example, the pressure roll 86 is a nip roll (rubber roll) and the pressure roll 87 is a metal roll (steel roll). The pressure roll 86 is a free roll, while the pressure roll 87 is speed synchronized with the lower roll 85 whose rotational speed is controlled.

The colored stretch film for packaging 83 and the colorless and transparent stretch film for packaging 72 laminated (laminated) as described above are passed between the lower roll 85 and the upper roll 84 of the heat-sealing roll portion. Then, the surface-heated upper roll 84 comes into contact with the colored wrapping stretch film 83 with an appropriate pressing pressure. As a result, the heat is also transferred to the lower transparent and colorless wrapping stretch film 72 , causing the surfaces to fuse together, and the subsequent pressure rollers 86 and 87 mature the fusion.

When the film passing speed of the colored stretch film for packaging 83 and the colorless and transparent stretch film for packaging 72 laminated (laminated) as described above is 100 to 200 m/min, the upper roll 84 which is a heating roll is 60 to 60 m/min. An 80mm outer diameter is easy to control and effective at 160-200°C. When the speed is further increased to 200 to 300 m/min, fusion can be achieved within the same temperature range by setting the outer diameter of the upper roll 84, which is a heating roll, to 100 to 130 mm. If the temperature is too high, the fusion will be violent, causing pinholes in the raw fabric, and the fabric will not withstand stretching during use, and may break. It is important to control the passing speed, crimping force, and surface temperature.

By passing through such a partial welding process, the colored stretch film for packaging 83 is laminated to the colorless and transparent packaging stretch film 72, and a heating medium is applied from above to partially form a colorless and transparent packaging film. When the stretch film 72 and the colored stretch film 83 for packaging are stretched and used, it is possible to manufacture a stretch film for packaging that is partially welded (in the width direction) to such an extent that it does not come off.

As for the partial welding (fusion), for example, when the width of the colored stretch film 83 for packaging is 50 mm, a width of about 5 mm is melted and continuously fused in the longitudinal direction.

(winding process)
Subsequently, it is wound into a roll by a winding roll (not shown).

In this way, a colorless and transparent ultra-thin first packaging stretch film is attached to a colored fourth packaging stretch film that is smaller in width in the lateral direction than the first packaging stretch film and is ultra-thin. A stretch film is laminated, a heating medium is applied from above, and a colored fourth stretch film for packaging is partially welded (fused) to form the fourth stretch film for packaging. 3 to 5 in which a colored portion extending in the longitudinal direction is formed in a part of the lateral direction perpendicular to the longitudinal direction, the stretch film for packaging 71 and the stretch film for packaging A case where a colored film 73 is sandwiched between a film 72 and stretched so as not to come off during use to produce the stretch film for packaging of the embodiment shown in FIGS. thickness can be reduced.

Therefore, it is possible to wind long (m) per outer diameter per roll, and there is an advantage in that it can be wound long for packaging machines when used. This leads to a reduction in replacement frequency.

For example, the colored film 73 is sandwiched between the wrapping stretch film 71 and the wrapping stretch film 72, and stretched so as not to come off during use. If the stretch film for packaging is 240 mm in outer diameter and 1200 m in roll, the stretch film for packaging in the embodiment shown in FIGS. It can be rolled up to 1600m.

By not using sandwiched materials, it is possible to reduce weight and reduce manufacturing costs.

(Embodiment 2 of method for manufacturing stretch film for packaging)
The stretch film for packaging described in the second embodiment of the stretch film described above can also be produced using an apparatus conventionally used for producing stretch films for packaging. An example thereof will be described with reference to FIG.

(Pinching process)
A raw film 61a of a packaging stretch film 71a (made of LLDPE, white, and extremely thin with a thickness of 5 to 12 microns before being stretched) before being stretched to be the first colored portion 153 is provided with a braking device 63. It is attached to the raw film holder 65 that is attached.

A raw film 67 of a colored film (made of LLDPE, red, and extremely thin with a thickness of 5 to 12 microns before being stretched) before being stretched to become the second colored portion 152 is provided with a brake device 68. It is attached to the raw film holder 69 that is in place.

A raw film 62 of a packaging stretch film 72 (made of LLDPE and having a thickness of 17 microns) before being stretched is attached to a raw film holder 66 equipped with a braking device 64 .

Between the wrapping stretch film 71a unstretched to become the first colored portion 153 unwound from the raw film holder 65 and the wrapping stretch film 72 unwound from the raw film holder 66, the original A colored film 73 unwound from the anti-film holder 69 is sandwiched.

The stretch film for packaging 72 unwound from the raw film holder 66 has a width of, for example, 500 mm through a stretching process.

The stretch film for packaging 71a unwound from the raw film holder 65, which will become the first colored portion 153, has a width smaller than the width of the stretch film for packaging 72 (that is, less than 500 mm) through the stretching process. It has width.

The colored film 73 unwound from the raw film holder 69 has a width smaller than the width of the packaging stretch film 71a that becomes the first colored portion 153 through the stretching process. However, it is desirable that the width exceeds 40 mm so that it can be used as an identification mark.

Therefore, the colored film 73 unwound from the raw film holder 69 has a width of 40 mm to 50 mm through the stretching process, and the first colored portion 153 unwound from the raw film holder 65 is a packaging stretch film. 71a can be made to have a width of 80 mm to 100 mm through a stretching process.

(Stretching process)
The color-attached film 73 is sandwiched between the colorless and transparent packaging stretch film 72 and the white packaging stretch film 71a that becomes the first colored portion 153. The whole is a conventionally known roll-shaped compression roll. It is pressed at 70 and stretched uniaxially or biaxially. Also in this case, for example, a pair of stretching rolls, which are illustrated in FIG.

In this way, the whole (packaging stretch film 74) in which the colored film 73 is sandwiched between the colorless and transparent wrapping stretch film 72 and the white wrapping stretch film 71a that becomes the first colored portion 153 The thickness is stretched to at least half or less of the sum of the thickness of the colorless and transparent stretch film for packaging 72 and the thickness of the white stretch film for packaging 71 a that will be the first colored portion 153 .

(winding process)
Subsequently, it is wound into a roll by a winding roll (not shown).

In the stretching process described above, for example, by stretching 3 times in the longitudinal direction and stretching 1.5 times in the transverse direction perpendicular to this, the thickness of the whole (packaging stretch film 74) is 9 microns. 14, a wrapping stretch film 154 can be manufactured.

Since the stretch film for packaging 154 of this embodiment is manufactured through the stretching process described above, it is desirable that the stretch film for packaging 71a, the stretch film for packaging 72, and the colored film 73 have the same elongation properties.

For example, as described above, the wrapping stretch film 71a, the wrapping stretch film 72, and the colored film 73 can be made of the same material.

Even in such a laminated structure in which a colored film forming a colored portion is sandwiched between two stretch films for packaging, it can be stretched uniaxially or biaxially to form two wrapping films. The thickness of the laminate structure in which the colored film forming the colored portion is sandwiched between the stretch films for packaging is stretched to be half or less of the total thickness of at least two stretch films for packaging.

Such stretching improves the strength per unit. Therefore, it is also possible to make the structure thinner.

In addition, when stretching a laminated structure in which a colored film forming a colored portion is sandwiched between two stretch films for packaging, in an embodiment in which a roll is pressed with a pressure roll, two wrapping films can be obtained. The stretch film for use and the colored film that forms the colored portion sandwiched therebetween are completely adhered to each other, and are not peeled off.

Both the unstretched packaging stretch film 71a attached to the original film holder 65 and the unstretched packaging stretch film 72 attached to the original film holder 66 are conventionally known packaging stretch films. Therefore, the surface is sticky.

Therefore, by attaching the colored film 73 that forms the second colored portions 52, 53a, and 56 as they are, it is possible to obtain a wrapping stretch film having colored portions.

That is, instead of manufacturing the packaging stretch film 154 shown in FIG. Using the stickiness of the surface of the stretch film, it is also possible to manufacture the stretch film 154 for packaging shown in FIG.

(Embodiment 3 of stretch film for packaging and embodiment of roll of stretch film for packaging)
7 to 9 show the stretch film for packaging 54a of this embodiment and the stretch film for packaging 54a of this embodiment being formed into a hollow cylindrical shape by a method for winding a roll of the stretch film for packaging, which will be described later. The wound bodies 81 and 91 of the stretch film for packaging of this embodiment, which are wound around the winding core 2 in a roll shape, will be described. The packaging of this embodiment, in which the stretch film for packaging 54a of this embodiment is wound into a roll around the cylindrical hollow winding core 2 by a method for winding and manufacturing a roll of stretch film for packaging, which will be described later. Windings 81, 91 of stretch film for industrial use are illustrated in FIGS. 7(a) and 8(a).

Ultra-thin (for example, about 6 to 30 μm thick), with a length of about 300 m to 500 m in the longitudinal direction, and a width of 300 mm to 500 mm in the lateral direction, which is the direction perpendicular to the longitudinal direction. The stretch film for packaging 54a is wound around the cylindrical hollow winding core 2 in a roll shape by a method for winding a stretch film for packaging described later. They are bodies 81 (FIG. 7(a)) and 91 (FIG. 8(a)).

In the embodiment shown in FIG. 7(a), the cylindrical hollow winding core 2 is provided with the colored portion 57 linearly extending in the longitudinal direction of the stretch film 54 for packaging described in the above embodiment. A wrapping stretch film 54a is wound in the form of being formed in the central portion in the direction.

In the embodiment shown in FIG. 8(a), the cylindrical hollow winding core 2 is provided with the colored portion 58 that bends in the longitudinal direction of the stretch film 54 for packaging, described in the above embodiment, and extends laterally. A wrapping stretch film 54a is wound in the form of being formed in the central portion in the direction.

The stretching film for packaging 54a shown in FIGS. 7 and 8 further comprises a plurality of portions having different thicknesses in the lateral direction of the packaging film 54a continuously in the longitudinal direction, so that the stretch film 54a is laminated and wound. A plurality of air layers 17a, 17b, 17c, and 17d continuous in the longitudinal direction of the stretch packaging film exist between the stretch films for packaging forming the layer 13 in the lateral direction of the stretch film for packaging 14. (Fig. 9).

FIG. 9 is a partially omitted cross-sectional view for explaining the structure of the outer periphery (outer diameter) side of the wrapping stretch film 54a laminated to form the winding layer 13. As shown in FIG. In FIG. 9 , the upper side is the outer diameter side of the winding bodies 81 and 91 , and the lower side is the inner diameter side of the winding bodies 81 and 91 .

The stretch film for packaging 54a wound on the outermost side in the stretch film for packaging 54a (FIG. 9) that is laminated to form the winding layer 13 extends from the side edge portion 18a, which is the end edge portion in the lateral direction. A thin portion 15g, a thick portion 15c, a thin portion 15f, a thick portion 15b, a thin portion 15e, a thick portion 15a, and a thin portion 15d are provided inwardly in the lateral direction.

Similarly, in the stretch film for packaging 54a (FIG. 9) laminated to form the winding layer 13, the stretch film for packaging 54b that is on the inner diameter side of the stretch film for packaging 54a in the radial direction is A thin portion 16g, a thick portion 16c, a thin portion 16f, a thick portion 16b, a thin portion 16e, a thick portion 16a, and a thin portion 16d are arranged laterally inward from a side edge portion 18b, which is an edge portion. I have it.

The stretch film for packaging 54a of the embodiment shown in FIGS. 7 and 8 has thick portions and thin portions that are continuous in the longitudinal direction alternately in the lateral direction of the stretch film for packaging 54a.

The stretch film rolls 81 and 91 of this embodiment are wound around the cylindrical hollow core 2 by a method for winding a stretch film roll to be described later. (Fig. 7(a), Fig. 8(a)).

As a result, when the stretch film for packaging 54a is wound around the winding core 2 to form a roll-shaped winding body, the stretch film for packaging is formed between the stretch films for packaging laminated to form the winding layer 13. Air layers 17a, 17b, 17c, and 17d continuous in the longitudinal direction of the film exist in the transverse direction of the stretch film 54a for packaging.

As a result, as shown in FIGS. 7(b) and 8(b), the leading end side 5 in the longitudinal direction is fixedly grasped, and the stretch film for packaging 54a is peeled off from the rolls 81 and 91 of the stretch film for packaging. When pulled out and used, air layers 17a, 17b, 17c, and 17d are present between the outermost (peripheral) wrapping stretch film 54a and the innermost wrapping stretch film 54b. Therefore, the wrapping stretch film 54a can be easily peeled off and pulled out.

In the stretch film 54a for packaging of this embodiment, the colored portion 57 linearly extending in the longitudinal direction and the colored portion 58 bent and extending in the longitudinal direction, which are described in the above embodiments, are arranged in the center in the lateral direction. It is a stretch film for packaging in a form formed into parts (Figs. 7 and 8).

Therefore, as shown in FIGS. 7(b) and 8(b), the leading end side 55 in the longitudinal direction is fixedly grasped, and the stretch film for packaging 54a is peeled off from the rolls 81 and 91 of the stretch film for packaging, When it is pulled out and used, wrapped around an article, etc. to pack and wrap the article, the presence of the colored portions 57 and 58 for identification makes it possible to identify what kind of article is packed and wrapped. can. At this time, the colored portions 57 and 58 are formed only on a part of the stretching film 54a for packaging in the lateral direction, and the portions other than the colored portions 57 and 58 are colorless and transparent, so that the product can be wound many times. Even when the article is attached and laminated many times and packed and wrapped, the packed and wrapped article cannot be visually recognized from the outside through the colorless and transparent parts other than the colored parts 57 and 58. can be done.

In this embodiment, the stretch film for packaging 54a has different thickness portions (thick portions 15a, etc. and thin portions 15d, etc.) that are continuous in the longitudinal direction. By providing a plurality of layers in the lateral direction, the air layers 17a continuous in the longitudinal direction of the stretch packaging film 54a between the stretch films for packaging laminated to form the winding layer 13, etc. The structure in which the film 54a is formed in plural in the lateral direction has been described.

Although not shown, instead of such a structure, the stretch film for packaging 54a is provided with a plurality of portions having different thicknesses intermittently in the longitudinal direction thereof in the lateral direction of the stretch film for packaging 54a. Between the stretch films laminated to form the winding layer 13, a plurality of air layers intermittently formed in the longitudinal direction of the stretch film for packaging 54a are formed in the lateral direction of the stretch film for packaging 54a. 7(b) and 8(b), the front end side 55 in the longitudinal direction is fixedly grasped, and the wrapping stretch film rolls 81 and 91 are separated from the stretch film for wrapping. When the 54a is peeled off and pulled out for use, the presence of an air layer between the outermost (peripheral) wrapping stretch film and the innermost wrapping stretch film allows the wrapping to The stretch film can be easily peeled off and pulled out.

(Embodiment 3 of a method for manufacturing a stretch film for packaging and an embodiment of a method for winding a roll of a stretch film for packaging)
The method for manufacturing the stretch film for packaging of this embodiment is an example of the method for manufacturing the stretch film for packaging 54a of the embodiment described with reference to FIGS. 7 to 9 above.

In addition, the winding manufacturing method of the roll of the stretch film for packaging of this embodiment is extremely thin (for example, about 6 to 30 μm thick) and has a long longitudinal length of about 300 m to 500 m. A stretch film for packaging having a width of about 300 mm to 500 mm in the transverse direction, which is a direction perpendicular to the direction, is wound into a roll as shown in FIGS. 7(a) and 8(a). This is a method for winding and manufacturing rolls 81 and 91 of stretch film for packaging.

In this embodiment, the material is the same as that of the first and second packaging stretch films between two colorless and transparent ultra-thin first and second packaging stretch films. First, a sandwiching step of sandwiching an ultra-thin colored film extending in the longitudinal direction of the first and second packaging stretch films is performed.

Alternatively, between a colorless and transparent, ultra-thin first packaging stretch film and a colored, ultra-thin third packaging stretch film having a smaller width in the lateral direction than the first packaging stretch film, The third wrapping stretch film is made of the same material as the first and third wrapping stretch films, and is extremely thin and extends in the longitudinal direction perpendicular to the lateral direction of the first and third wrapping stretch films. First, a sandwiching step of sandwiching a colored film having a width in the lateral direction smaller than the width in the lateral direction of the film and exhibiting a color different from the color of the third stretch film for packaging is performed.

Alternatively, a colorless and transparent ultra-thin first wrapping stretch film is attached to a fourth wrapping stretch that is colored and has a width in the lateral direction smaller than that of the first wrapping stretch film and is ultra-thin. First, a step of laminating the film and applying a heating medium thereon to partially weld a colored fourth stretch film for packaging is carried out.

Subsequently, uniaxial or biaxial stretching is performed to form a plurality of portions with different thicknesses continuous in the longitudinal direction of the stretch film for packaging in the transverse direction of the stretch film for packaging, or in the longitudinal direction. A plurality of intermittently formed portions having different thicknesses are formed in the lateral direction of the stretch film for packaging, and the thickness of the entirety of the stretch film for packaging, in which the colored film is sandwiched between the stretch films for packaging, is at least It is stretched to half or less of the total thickness of the two stretching films for packaging.

Alternatively, a plurality of portions with different thicknesses that are continuous in the longitudinal direction of the stretch film for packaging are formed in the transverse direction of the stretch film for packaging, or the stretch film for packaging is stretched in the longitudinal direction. A plurality of portions with different thicknesses intermittently formed in the direction are formed in the transverse direction of the stretch film for packaging, and between the first stretch film for packaging and the third stretch film for packaging, the The entire thickness of the sandwiched colored film is stretched to at least half or less of the sum of the thickness of the first stretch film for packaging and the thickness of the third stretch film for packaging.

Alternatively, it is subsequently stretched in a uniaxial direction or in a biaxial direction to form a plurality of portions with different thicknesses continuous in the longitudinal direction orthogonal to the lateral direction, or in the longitudinal direction. A stretching step is performed to form a plurality of portions having different thicknesses intermittently formed in the lateral direction.

After this stretching step, by winding into a roll, a plurality of air layers continuous in the longitudinal direction are formed between the films laminated to form a wound layer in the lateral direction, or in the longitudinal direction. A roll of stretch film for packaging in which a plurality of intermittently formed air layers are present in the lateral direction is wound and manufactured.

In the above, the step of uniaxially or biaxially stretching to form a plurality of portions with different wall thicknesses continuous in the longitudinal direction of the stretch film for packaging in the transverse direction of the stretch film for packaging, A plurality of irregularities continuous in the longitudinal direction of the stretch film for packaging can be formed in the lateral direction of the stretch film for packaging.

Further, in the above, a step of uniaxially or biaxially stretching to form a plurality of portions having different thicknesses in the longitudinal direction of the stretch film for packaging, and forming a plurality of portions in the lateral direction of the stretch film for packaging. can be formed by embossing the entirety of the colored film sandwiched between the wrapping stretch films.

Further, the step of uniaxially or biaxially stretching to form a plurality of portions having different thicknesses in the longitudinal direction of the stretch film for packaging, and forming a plurality of portions in the transverse direction of the stretch film for packaging, It can be formed by pressing a mold having a predetermined shape against the entirety of the colored film sandwiched between the stretch films for packaging.

Furthermore, the step of forming a plurality of portions with different thicknesses continuous in the longitudinal direction of the stretch film for packaging in the transverse direction of the stretch film for packaging by performing the stretching process in the uniaxial direction or biaxial direction. Alternatively, the stretch film for packaging can be formed by subjecting the entirety of the colored film sandwiched between the stretch films to a partial stretching process.

In this case, the partial stretching is performed by a pair of cylindrical stretching rollers, each of which has an outer peripheral ridge portion and an outer peripheral groove portion alternately in the direction in which the central axis extends, and rotates around the central axis. However, with respect to the stretching rollers arranged in such a manner that the outer peripheral ridge of one of the cylindrical stretching rollers meshes with the outer peripheral groove of the other cylindrical stretching roller, the two packages The entirety of the color-imparting film sandwiched between the stretch films for use is inserted in the longitudinal direction.

In this case, the pair of cylindrical stretching rollers are arranged upstream and downstream in the direction in which the entirety of the colored film sandwiched between the stretch films for packaging is inserted in the longitudinal direction. The cylindrical stretching rollers on the downstream side can rotate at a peripheral speed higher than the cylindrical stretching rollers on the upstream side.

FIG. 6 and FIG. 10 show a schematic configuration of an example of an apparatus employed in the manufacturing process described above.

On the right end side of FIG. 10( a ), although illustration is omitted, the unstretched packaging stretch film 71 (made of LLDPE and having a thickness of 17 microns) described in FIG. , and a raw film 67 of an ultra-thin colored film 73 (made of LLDPE and having a thickness of 17 microns) before stretching is attached to a raw film holder 69 equipped with a brake device 68. A raw film 62 of a wrapping stretch film 72 (made of LLDPE and having a thickness of 17 microns) before being stretched is mounted on a raw film holder 66 having a braking device 64 .

Colored film unwound from the original film holder 69 is placed between the packaging stretch film 71 unwound from the original film holder 65 and the packaging stretch film 72 unwound from the original film holder 66. 73 is sandwiched.

Thus, stretching is performed by the pair of stretching rolls 25 while the colored film 73 is sandwiched between the stretch film for packaging 71 and the stretch film for packaging 72 .

As described with reference to FIGS. 18 to 20, one colorless and transparent first ultra-thin stretch film for packaging has a width in the transverse direction that is larger than that of the colored first stretch film for packaging. A small, ultra-thin sheet of the fourth wrapping stretch film is laminated, and a heating medium is applied from above to partially weld the colored fourth wrapping stretch film, and a pair of stretching is performed. A form in which stretching is performed by rolls 25 can also be used.

The pair of drawing rolls 25 can be, for example, a pair of embossing rolls, a pair of gear rolls, a pair of grooved rollers.

The pair of stretching rolls 25 are driven by a stretching roll driving motor 23 and a drive gear 24 that interlocks the pair of stretching rolls 25 . The stretching ratio between the pair of stretching rolls 25 is set by, for example, a combination gear.

A case in which the pair of stretching rolls 25 are composed of a pair of gear rolls will be described with reference to FIG.

The pair of gear rolls shown in FIG. 11 is a combination of a high-speed side gear 25a and a low-speed side gear 25b. can be set to 15 mm, and the reduction ratio can be set to 1.0 to 3.0.

In FIG. 11, the portion indicated by symbol A is pressed by the convex portion of the low-speed side gear 25b, so that the extension in the lateral direction is difficult to occur. On the other hand, in FIG. 11, at the location indicated by the symbol B, stretching in the lateral direction is caused by being guided by the high-speed side gear 25a. As a result, the stretch film portion for packaging passing through the point indicated by symbol A in FIG. The stretch film portion for packaging passing through the point indicated by symbol B in FIG. 11 has a thinner cross section (thinner) than the stretch film portion for packaging passing through the point indicated by symbol A in FIG. 11 .

As a result, it is possible to form a plurality of portions having different thicknesses continuous in the longitudinal direction of the stretch film for packaging in the transverse direction.

The drawing ratio is increased by the surface speed and engagement (GAP) of the high-speed side gear 25a and the low-speed side gear 25b that form a pair of gear rolls.

In the pair of cylindrical stretching rolls 25 shown in FIG. 10(a), for example, in the direction in which the stretch film for packaging before winding is inserted in the longitudinal direction, as shown in FIG. 10(a) Among the pair of cylindrical stretching rolls 25 arranged upstream and downstream, the downstream stretching roller 25 rotates at a higher peripheral speed than the upstream stretching roller 25. can do.

With reference to FIG. 12, an example of embossing a stretch film for packaging to form a plurality of portions having different thicknesses intermittently in the longitudinal direction in the transverse direction will be described.

A pair of gear rolls shown in FIG. 12 is formed by a pair of embossing rolls 25c and 25d (FIG. 12(a)). When the embossing rolls 25c and 25d are matched, it becomes as shown in FIG. 12(b), and when the embossing rolls 25c and 25d are misaligned, it becomes as shown in FIG. 12(c). A plurality of portions having different thicknesses are intermittently formed on the surface of the stretch film for packaging in the longitudinal direction of the stretch film for packaging and in the transverse direction of the stretch film for packaging.

With reference to FIG. 13, an example of embossed gear processing in which a plurality of portions having different thicknesses intermittently in the longitudinal direction of the stretch film for packaging are formed in the lateral direction will be described.

According to the embossed gear processing shown in FIG. 13, stretching in the longitudinal direction (rotational direction) is performed by the unevenness of the gear, and the notch groove portion is not stretched and becomes a thick portion.

As described above, a stretch film for compensation in which a plurality of portions with different thicknesses continuous in the longitudinal direction are formed in the transverse direction, or a portion with different thicknesses intermittently in the longitudinal direction is formed in the transverse direction. The multi-formed packaging stretch film is subsequently fed to the film expansion section.

In the embodiment shown in FIG. 10, the film is first expanded by wrinkle removal and film expansion guide rolls 26 arranged downstream of the pair of stretching rolls 25 .

The wrinkle removing and film expanding guide roll 26 of the illustrated embodiment is composed of a plurality of wrapped rubber rolls with continuously decreasing central outer diameters.

A pair of stretching rolls 27 are arranged downstream of the crease removing and film stretching guide rolls 26 . The pair of stretching rolls 27 are, for example, rubber rolls, and consist of an upper low-speed roll and a lower high-speed roll in FIG. is stretched to

The stretching in the longitudinal direction here is, for example, the processing by the pair of stretching rolls 25 is by embossing rolls, and the portions with different thickness intermittently in the longitudinal direction of the stretch film for packaging are stretched in the transverse direction. In the case of a plurality of moldings, the stretch film for packaging after such treatment is stretched in the longitudinal direction.

In addition, when the treatment by the pair of stretching rolls 25 is performed by something other than embossing rolls, the stretching treatment by the pair of stretching rolls 27 is performed in the longitudinal (longitudinal) direction (MD) and the biaxial transverse direction (TD). It is a stretching process for optimizing the

The pair of stretching rolls 27 are rotationally driven by a driving motor 29, and stretched in the longitudinal direction by a pair of nip rolls 30 positioned downstream of the pair of stretching rolls 27 and interlocked by a drive interlocking gear 28. The wrapped stretch film for packaging is taken over. In the figure, reference numeral 31 denotes a winding shaft and a paper tube holder.

After that, it is taken up by the take-up roll 32 driven by the take-up drive motor 33 .

Thus, the stretch film for packaging 54a of the embodiment described with reference to FIGS. 7 to 9 is manufactured.

Further, rolls 81 and 91 of the stretch film for packaging of this embodiment described with reference to FIGS. 7 to 9 are wound and manufactured.

When plastic is stretched, a phenomenon called shrinkage occurs. By using this, the plastic film is streaked and then stretched, and the difference in shrinkage after stretching between the streaks (thick parts) and the valleys of the streaks (thin parts) causes the plastic film to crease. , a technique of generating wrinkles to give a voluminous and soft feeling to a string made from such a plastic film is known (Non-Patent Document 1).

A plurality of portions with different thicknesses continuous in the longitudinal direction of the stretch film for packaging are formed in the transverse direction while partially stretching the stretch film for packaging before winding as described above. The process utilizes this technology.

In this way, before winding into a roll, a colored film made of the same material is sandwiched between two stretch films for packaging, and stretched uniaxially or biaxially. A plurality of portions with different thicknesses that are continuous in the longitudinal direction of the two stretch films for packaging by processing are formed in the transverse direction of the two stretch films for packaging, or intermittently in the longitudinal direction. A plurality of portions with different thicknesses are formed in the lateral direction of two stretch films for packaging, and the overall thickness of the colored film sandwiched between the two stretch films for packaging is at least the thickness of the two stretch films. It is intended to be stretched to a half or less of the total thickness of the stretch film for packaging.

As described above with reference to FIGS. 6 and 10 to 13, a pair of stretching rolls 25 consisting of a pair of embossing rolls, a pair of gear rolls, a pair of grooved rollers, etc., stretches, removes creases, and expands the film guide rolls. By stretching the film by 26 and stretching in the longitudinal direction by a pair of stretching rolls 27, for example, the conventional stretch film for packaging that is rotatably set on the raw film feeding side on the right side of FIG. When the stretch film for packaging wrapped around the roll has a thickness of 23 μm and a width of 250 mm, and the colored film has a thickness of 23 μm and a width of 10 mm, the width is doubled and the length is doubled. A package that is stretched, has a thickness of 12 μm and a width of 500 mm, and has a plurality of portions with different thicknesses that are continuous in the longitudinal direction and are formed in the lateral direction, and has a colored part that extends along the longitudinal direction in a part of the lateral direction. The stretch film for packaging can be made into a stretch film for packaging and wound by a winding machine to produce the roll 11 of the stretch film for packaging of this embodiment described with reference to FIGS. 7 to 9 .

In addition, as described above, when the rolls 81 and 91 of the stretch film for packaging of the embodiment are wound and manufactured, the side edges of the roll of stretch film for packaging wound around the cylindrical core (Fig. 9) are not stretched and are wound on a roll of a conventional wrapping stretch film which is rotatably set on the feed side of the original film. The thickness of the long stretch film can be almost maintained. Therefore, it is possible to reduce the risk of breakage due to scratches or damage on the side edges of the roll of stretch film for packaging wound around the cylindrical core when the film is pulled out for use.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-described embodiments, and can be variously modified within the technical scope grasped from the description of the claims. .

For example, as described above, instead of forming a plurality of portions having different thicknesses continuously in the longitudinal direction of the stretch packaging film before winding into a roll, A plurality of portions having different thicknesses can be formed intermittently in the longitudinal direction.

In this case, for example, the stretch film for packaging before being wound is embossed, or the stretch film for packaging before being wound is pressed with a mold of a predetermined shape. , a plurality of portions having different thicknesses can be formed intermittently in the longitudinal direction of the packaging film.

In addition, in order to form the colored portions 52, 53a, 53b, 56, 57, 58, it is sandwiched between two wrapping stretch films before being stretched, and is uniaxially or biaxially stretched together with the two wrapping stretch films. By using a plurality of standard colors such as red, blue, and yellow as the color of the colored film that is stretched in the direction, a part of the colorless and transparent stretch film for packaging in the transverse direction can be applied to the stretch film for packaging. Since it is possible to provide a stretch film for packaging having a colored portion consisting of standard colors extending in the longitudinal direction, it is possible to use this for packaging and packaging of goods, so that factories, production, sorting of quantities, and plot management can be improved. become easier.

2 Cylindrical hollow winding cores 15d, 15e, 15f, 15g, 16d, 16e, 16f, 16g Thin portions 15a, 15b, 15c, 16a, 16b, 16c Thick portions 17a, 17b, 17c, 17d Air layer 18a 18b Side edge portion 23 in the transverse direction of the stretch film for packaging Stretch roll drive motor 24 Drive gear 25 Pair of stretch rolls 25a High speed side gear 25b Low speed side gears 25c and 25d Pair of emboss rolls 26 Wrinkle removal and film expansion guide roll 27 Pair Stretching roll 28 Drive interlocking gear 29 Drive motor 30 Pair of nip rolls 31 Winding shaft, paper tube holder 33 Winding drive motor 32 Winding rolls 51, 61, 71, 81, 91, 151, 161, 171 Stretch film for packaging Roll 52 53a, 53b, 56 Colored parts 54, 54a, 154 Stretch film for packaging 62 Original fabric 63 Brake device 64, 68 Brake device 65, 66, 69 Original film holder 67 Original fabric 70 Crimp rolls 71, 71a Stretching Front packaging stretch film 73 Ultra-thin colored film 72 before stretching Packaging stretch film 153 before stretching First colored parts 152, 153a, 156 Second colored part

Claims (27)

Between the two ultrathin colorless and transparent synthetic resin first and second packaging stretch films, the first and second packaging stretch films made of synthetic resin are placed. A stretch film for packaging in which an ultra-thin colored film extending in the longitudinal direction is sandwiched,
The colored portion extending in the longitudinal direction formed by the colored film is formed in a part of the lateral direction orthogonal to the longitudinal direction ,
A plurality of portions having different thicknesses continuous in the longitudinal direction of the first and second stretch films for packaging forming the stretch film for packaging are formed in the transverse direction of the first and second stretch films for packaging. Alternatively, a plurality of portions having different thicknesses intermittently formed in the longitudinal direction are formed in the transverse direction of the first and second stretch films for packaging.
Stretch film for packaging. The stretch film for packaging according to claim 1, wherein the colored portion extends linearly in the longitudinal direction of the stretch film for packaging. 2. The stretch film for packaging according to claim 1, wherein the colored portion extends while bending in the longitudinal direction of the stretch film for packaging. The stretch film for packaging according to any one of claims 1 to 3, wherein the colored portions are formed at a plurality of locations spaced apart in the lateral direction. Between a synthetic resin, colorless and transparent, ultra-thin first packaging stretch film and a colored, ultra-thin third packaging stretch film that is smaller in width in the transverse direction than the first packaging stretch film. Secondly, it is made of synthetic resin, extends in the longitudinal direction perpendicular to the lateral direction of the first and third wrapping stretch films, is extremely thin, and is smaller than the width of the third wrapping stretch film in the lateral direction. A stretch film for packaging in which a colored film having a width in the lateral direction and exhibiting a color different from the color of the third stretch film for packaging is sandwiched,
A colored portion extending in the longitudinal direction formed by the colored film is formed in a part of the third wrapping stretch film in the lateral direction ,
A plurality of portions with different thicknesses continuous in the longitudinal direction of the stretch film for packaging are formed in the transverse direction of the stretch film for packaging, or the stretch films for packaging have different thicknesses intermittently formed in the longitudinal direction. A plurality of portions are formed in the lateral direction of the stretch film for packaging
Stretch film for packaging. 6. The stretch film for packaging according to claim 5, wherein the colored portion extends linearly in the longitudinal direction of the stretch film for packaging. 6. The stretch film for packaging according to claim 5, wherein the colored portion extends while bending in the longitudinal direction of the stretch film for packaging. The stretch film for packaging according to any one of claims 5 to 7, wherein the colored portions are formed at a plurality of locations in the third stretch film for packaging that are spaced apart in the lateral direction. The stretch film for packaging according to any one of claims 5 to 8, wherein the third stretch film for packaging exhibits a white color. A colorless and transparent synthetic resin ultra-thin first packaging stretch film is attached to a colored fourth packaging that is smaller in width in the lateral direction than the first packaging stretch film and ultra-thin. The stretch film for packaging is laminated, and the first stretch film for packaging and the fourth stretch film for packaging are partially welded to form the fourth stretch film for packaging. A stretch film for packaging in which a colored portion extending in the longitudinal direction is formed in a part of the lateral direction orthogonal to the longitudinal direction ,
A plurality of portions with different thicknesses continuous in the longitudinal direction of the stretch film for packaging are formed in the transverse direction of the stretch film for packaging, or the stretch films for packaging have different thicknesses intermittently formed in the longitudinal direction. A plurality of portions are formed in the lateral direction of the stretch film for packaging
Stretch film for packaging. The stretch film for packaging according to claim 10, wherein the colored portion extends linearly in the longitudinal direction of the stretch film for packaging. 11. The stretch film for packaging according to claim 10, wherein the colored portion extends while bending in the longitudinal direction of the stretch film for packaging. The stretch film for packaging according to any one of claims 10 to 12, wherein the colored portions are formed at a plurality of locations spaced apart in the lateral direction. Between the two ultrathin colorless and transparent synthetic resin first and second packaging stretch films, the first and second packaging stretch films made of synthetic resin are placed. A sandwiching process that sandwiches an ultra-thin colored film extending in the longitudinal direction,
Subsequently, the first and second stretch films for packaging are stretched in a uniaxial direction or a biaxial direction, and the portions having different thicknesses continuous in the longitudinal direction are stretched by the first and second stretch films for packaging. A plurality of portions having different thicknesses formed intermittently in the longitudinal direction of the film are formed in the transverse direction of the first and second wrapping stretch films, and the first wrapping is formed. The total thickness of the colored film sandwiched between the stretch film for packaging and the second stretch film for packaging is equal to at least the thickness of the first stretch film for packaging and the thickness of the second packaging stretch film. Stretching step of stretching to less than half of the total thickness of the stretch film,
After the stretching step, the step of winding into a roll
A method for producing a stretch film for packaging. Between a synthetic resin, colorless and transparent, ultra-thin first packaging stretch film and a colored, ultra-thin third packaging stretch film that is smaller in width in the transverse direction than the first packaging stretch film. Secondly, it is made of synthetic resin, extends in the longitudinal direction perpendicular to the lateral direction of the first and third wrapping stretch films, is extremely thin, and is smaller than the width of the third wrapping stretch film in the lateral direction. A sandwiching step of sandwiching a colored film having a width in the lateral direction and exhibiting a color different from the color of the third wrapping stretch film;
Subsequently, the first and third stretch films for packaging are stretched in a uniaxial direction or a biaxial direction, and the portions having different thicknesses continuous in the longitudinal direction of the stretch film for packaging are stretched in the first and third stretches for packaging. A plurality of portions having different thicknesses are formed in the transverse direction of the film, or formed intermittently in the longitudinal direction and formed in the transverse direction of the first and third stretch films for packaging, and the first The total thickness of the colored film sandwiched between the stretch film for packaging and the third stretch film for packaging is at least the thickness of the first stretch film for packaging and the thickness of the third packaging. A stretching process that stretches to less than half of the total thickness of the stretch film for
After the stretching process, the process of winding into a roll
A method for producing a stretch film for packaging. A colorless and transparent synthetic resin ultra-thin first packaging stretch film is attached to a colored fourth packaging that is smaller in width in the lateral direction than the first packaging stretch film and ultra-thin. Laminating a stretch film for
subsequently partially welding the first stretch film for packaging and the fourth stretch film for packaging;
Subsequently, uniaxial or biaxial stretching is performed to form a plurality of portions with different thicknesses continuous in the longitudinal direction orthogonal to the lateral direction, or intermittently in the longitudinal direction. A stretching step of forming a plurality of portions having different thicknesses in the lateral direction,
After the stretching step, the step of winding into a roll
A method for producing a stretch film for packaging. A roll of stretch film for packaging obtained by winding a stretch film for packaging into a roll,
The stretch film for packaging according to any one of claims 1 to 13,
Between the films laminated to form a wound layer, the air layers continuous in the longitudinal direction of the stretch film for packaging are plural in the lateral direction of the stretch film for packaging, or intermittent in the longitudinal direction. A roll of stretch film for packaging in which a plurality of air layers are formed in the transverse direction of the stretch film for packaging. The air layer includes a plurality of portions having different thicknesses in the transverse direction of the stretch film for packaging, continuously or intermittently in the longitudinal direction of the stretch film for packaging. 18. The roll of stretch film for packaging according to claim 17, which is formed by A method for winding a stretch film for packaging into a roll, comprising:
Between the two ultrathin colorless and transparent synthetic resin first and second packaging stretch films, the first and second packaging stretch films made of synthetic resin are placed. A sandwiching process that sandwiches an ultra-thin colored film extending in the longitudinal direction,
Subsequently, the first and second stretch films for packaging are stretched in a uniaxial direction or a biaxial direction, and the portions having different thicknesses continuous in the longitudinal direction are stretched by the first and second stretch films for packaging. A plurality of portions having different thicknesses formed intermittently in the longitudinal direction of the film are formed in the transverse direction of the first and second wrapping stretch films, and the first wrapping is formed. The total thickness of the colored film sandwiched between the stretch film for packaging and the second stretch film for packaging is equal to at least the thickness of the first stretch film for packaging and the thickness of the second packaging stretch film. Stretching step of stretching to less than half of the total thickness of the stretch film,
After the stretching step, by winding into a roll, a plurality of air layers continuous in the longitudinal direction are formed between the films laminated to form a wound layer in the lateral direction, or in the longitudinal direction. A step of causing a plurality of intermittently formed air layers to exist in the lateral direction
A winding manufacturing method for a roll of stretch film for packaging. A method for winding a stretch film for packaging into a roll, comprising:
Between a synthetic resin, colorless and transparent, ultra-thin first packaging stretch film and a colored, ultra-thin third packaging stretch film that is smaller in width in the transverse direction than the first packaging stretch film. Secondly, it is made of synthetic resin, extends in the longitudinal direction perpendicular to the lateral direction of the first and third wrapping stretch films, is extremely thin, and is smaller than the width of the third wrapping stretch film in the lateral direction. A sandwiching step of sandwiching a colored film having a width in the lateral direction and exhibiting a color different from the color of the third wrapping stretch film;
Subsequently, the first and third stretch films for packaging are stretched in a uniaxial direction or a biaxial direction, and the portions having different thicknesses continuous in the longitudinal direction of the stretch film for packaging are stretched in the first and third stretches for packaging. A plurality of portions having different thicknesses are formed in the transverse direction of the film, or formed intermittently in the longitudinal direction and formed in the transverse direction of the first and third stretch films for packaging, and the first The total thickness of the colored film sandwiched between the stretch film for packaging and the third stretch film for packaging is at least the thickness of the first stretch film for packaging and the thickness of the third packaging. A stretching process that stretches to less than half of the total thickness of the stretch film for
After the stretching step, by winding into a roll, a plurality of air layers continuous in the longitudinal direction are formed between the films laminated to form a wound layer, or intermittent in the longitudinal direction. A step of allowing a plurality of air layers formed in the horizontal direction to exist in the horizontal direction
A winding manufacturing method for a roll of stretch film for packaging. A method for winding a stretch film for packaging into a roll, comprising:
A colorless and transparent synthetic resin ultra-thin first packaging stretch film is attached to a colored fourth packaging that is smaller in width in the lateral direction than the first packaging stretch film and ultra-thin. Laminating a stretch film for
subsequently partially welding the first stretch film for packaging and the fourth stretch film for packaging;
Subsequently, uniaxial or biaxial stretching is performed to form a plurality of portions with different thicknesses continuous in the longitudinal direction orthogonal to the lateral direction, or intermittently in the longitudinal direction. A stretching step of forming a plurality of portions having different thicknesses in the lateral direction,
After the stretching step, by winding into a roll, a plurality of air layers continuous in the longitudinal direction are formed between the films laminated to form a wound layer in the lateral direction, or in the longitudinal direction. A step of causing a plurality of intermittently formed air layers to exist in the lateral direction
A winding manufacturing method for a roll of stretch film for packaging. The stretching process in the uniaxial direction or the biaxial direction is performed to form a portion having a different thickness continuous in the longitudinal direction of the first and second stretch films for packaging. The step of forming a plurality in the lateral direction of the first and second stretch films for packaging includes forming a plurality of uneven portions continuous in the longitudinal direction of the first and second stretch films for packaging in the lateral direction of the first and second stretch films for packaging. is something
20. The method for winding a roll of the stretch film for packaging according to claim 19 . The first and second stretch films for packaging are stretched in the uniaxial direction or biaxial direction, and the portions having different thicknesses in the longitudinal direction of the first and second stretch films for packaging are discontinued to obtain the stretch films for packaging. The step of forming a plurality of layers in the lateral direction is formed by embossing the entirety of the colored film sandwiched between the first stretch film for packaging and the second stretch film for packaging. do
20. The method for winding a roll of the stretch film for packaging according to claim 19 . The first and second stretch films for packaging are stretched in the uniaxial direction or biaxial direction to discontinue the portions having different thicknesses in the longitudinal direction of the first and second stretch films for packaging. In the step of forming a plurality in the lateral direction of the above, a stamping die of a predetermined shape is pressed against the entirety of the colored film sandwiched between the first stretch film for packaging and the second stretch film for packaging. form by
20. The method for winding a roll of the stretch film for packaging according to claim 19 . The stretching process in the uniaxial direction or the biaxial direction is performed to stretch the first and second stretch films for packaging, which are continuous in the longitudinal direction and have different thicknesses, into the first and second stretch films for packaging. The step of forming a plurality of films in the lateral direction of the film includes partially stretching the entirety of the colored film sandwiched between the first stretch film for packaging and the second stretch film for packaging. formed by applying
20. The method for winding a roll of the stretch film for packaging according to claim 19 . The partial stretching process is
A pair of cylindrical stretching rollers each alternately provided with an outer peripheral ridge portion and an outer peripheral groove portion in the direction in which the central axis extends and which rotates about the central axis For the stretching rollers arranged in such a manner that the outer peripheral ridges engage with the outer peripheral grooves of the other cylindrical stretching roller,
It is performed by inserting the whole in which the colored film is sandwiched between the first wrapping stretch film and the second wrapping stretch film in the longitudinal direction.
26. The method for winding a roll of stretch film for packaging according to claim 25 . The pair of cylindrical stretching rollers are arranged in the direction in which the entirety of the colored film sandwiched between the first stretch film for packaging and the second stretch film for packaging is inserted in the longitudinal direction. , and the cylindrical stretching rollers on the downstream side rotate at a higher peripheral speed than the cylindrical stretching rollers on the upstream side.
27. The method for winding a roll of stretch film for packaging according to claim 26 .

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