KR100965016B1 - Plastic bag which is able to be torn-off and method of manufactuing thereof - Google Patents

Abstract

The present invention relates to a plastic bag having airtightness, and more particularly, a product in which vacuum packaging, sterilization packaging, and the like can be packaged so that the contents are not contaminated. It relates to a plastic bag made to be easily cut and a manufacturing method of the plastic bag.

In addition, the cuttable plastic bag is preferably used as a packaging bag that requires particularly tightness in freezing storage and transport, and prevents defects in which the pieces of the plastic bag are mixed into the contents, and cuts the line when cutting for opening. The present invention relates to a cuttable plastic bag that is not twisted and is formed straight in a straight line, and a method of manufacturing the plastic bag.

Cutout, Plastic Bag, PE, Foam, LDPE, HDPE, Easy Cut

Description

Plastic bag that can be cut and its manufacturing method {PLASTIC BAG WHICH IS ABLE TO BE TORN-OFF AND METHOD OF MANUFACTUING THEREOF}

The present invention relates to a plastic bag that can be cut, and more particularly, it is possible to package a product such as vacuum packaging or sterilization packaging so that the contents are not contaminated, but also a horizontal band-shaped cutout is formed so that the cut portion is easily formed by hand. It relates to a plastic bag and a method of manufacturing the plastic bag made to be cut.

Evaporation film composed of a plastic film and a layer of material layers such as plastic, aluminum foil, and other metals and paper are widely used as a light, excellent sealing, and easy to handle bags.

The plastic bag using the film can be utilized as an excellent airtight bag by simply heat sealing without using a special adhesive. Due to these advantages, the films have recently been in the spotlight as bags containing various contents such as food, medicine, other liquids, powders, solids, and the like.

Such a plastic bag is convenient for the end user to be able to easily cut the heat-sealed portion while having the airtightness and sealing property described above, and a lot of effort is put into the development of a plastic bag having such characteristics. to be.

In general, a hermetically sealed plastic bag has a strong resistance to rupture, and thus has the disadvantage that it cannot be easily opened by hand without using a knife or other tool. However, once a small scratch is formed at any point of the plastic bag, it has a characteristic that it is easy to cut off from the scratch.

Therefore, the conventional plastic bag manufactured to be cutable by using the characteristics of the plastic film, to form a small scratch on one side of the corner of the plastic bag in advance so that the plastic bag can be opened by cutting the scratch.

For example, a method of forming a cutout in which a portion of a plastic bag is heat-sealed in a horizontal direction and forming a notch of 2 mm or less in a predetermined portion of the corner is widely used. However, this method has a problem that it is difficult to easily find the formed notch.

Thus, to solve the above problem, a method of forming a V-shaped notch instead of a straight notch has been proposed. According to the V-shaped notch forming method, it is possible to solve some of the problems of notability confirmation in the formation of a straight notch, but when manufacturing a large-capacity plastic bag, the fragments of the V-shaped notch generated in the V-shaped notch forming process There is a problem that is incorporated into the contents.

In addition, according to the method of forming a notch in the heat-sealing specific portion of the plastic bag, there is a possibility that the tear line is unfolded in an unexpected direction when spilling for opening, spilling the contents, and notched in advance before forming the shape of the plastic bag. Due to the formation of the plastic bag produced by this can be easily torn, there is a problem that efficient process control in the process of manufacturing the plastic bag form is difficult.

According to Japanese Laid-Open Patent Publication No. 1983-160252, a plastic bag having a cut portion formed by forming a heat seal portion in a vertical direction at a corner portion and forming a plurality of scratches on the heat seal portion is disclosed. However, since the plurality of scratches are formed by performing a rubbing process by abrasive stone or the like, the appearance thereof is poor, and the size and direction of the scratches formed in this way are highly likely to be irregularly formed, thus making it difficult to open the plastic bag. Followed, there is a problem that when cutting for opening, the cutting line is not formed uniformly.

The present invention is to solve the above problems, an object of the present invention is to provide a removable plastic bag that can be easily opened while maintaining the sealing.

In addition, the present invention by mixing a separate cut resin composition to the plastic bag base material, to prevent the defects in the notch or hole fragments are incorporated into the contents according to the formation of the notch in the corner portion of the conventional plastic bag, or performing the hole forming process. The purpose is to provide a plastic bag.

It is also an object of the present invention to provide a cutable plastic bag which is formed straight in a straight line without being twisted at the time of cutting for opening.

In addition, it is an object of the present invention to provide a manufacturing method that can be easily and economically produced a plastic bag formed with a cut portion made of a resin composition by supplying a resin composition and a plastic bag-based resin composition forming a cut portion at a time.

In the cuttable plastic bag according to the first embodiment of the present invention for solving the above problems, the cutout resin composition forming the cutout part in a cuttable plastic bag having a cutout portion formed in a horizontal band shape on a plastic bag base material, Blowing agent.

In addition, the cut resin composition comprises a low density polyethylene and a blowing agent, in the cut resin composition 100% by weight, the low density polyethylene is 80 to 99% by weight; The blowing agent comprises 1 to 20% by weight.

Here, the cut resin composition further comprises a color-containing pigment, in the cut resin composition 100% by weight, the low density polyethylene is 77 to 96% by weight; The blowing agent 1 to 18% by weight; It is preferable that the pigment comprises 1 to 6% by weight in order to easily distinguish the cutout with the naked eye.

Further, the blowing agent may be azodicarbonamide, N, N'-dinitrosopentamethylenetetramine, N, N'-dinitroso-N, N'-dimethylterephthalateamide, benzenesulfonylhydrazide, p-toluene At least one of sulfonylhydrazide, 4,4'-oxybisbenzenesulfonylhydrazide, benzene-1,3-disulfohydrazide, azide terephthalate, sodium bicarbonate, sodium bicarbonate, and ammonium chloride It is desirable for maximization.

In addition, the plastic encapsulation base material is preferably made of a low density polyethylene alone or a plastic encapsulation base resin composition mixed with a linear low density polyethylene to prevent deformation of the plastic bag by identifying thermal characteristics with the cutout.

A cuttable plastic bag according to a second embodiment of the present invention is a cuttable plastic bag in which a cutout portion is formed in a horizontal band shape on a plastic bag substrate, wherein the cutout portion is formed of a high-density polyethylene. It consists of a cut resin composition consisting of.

In addition, the cut resin composition further comprises a pigment containing a color, in the cut resin composition 100% by weight, the high density polyethylene is 94 to 99% by weight; It is preferable that the pigment comprises 1 to 6% by weight in order to easily distinguish the cutout with the naked eye.

In addition, the cut resin composition further comprises a linear low density polyethylene, in the resin composition 100% by weight, the high density polyethylene is 50 to 90% by weight; It is preferable to include 10 to 50% by weight of the linear low density polyethylene in order to produce a plastic bag having workability or moldability.

Here, the cut resin composition further comprising a linear low density polyethylene further comprises a pigment containing a color, in the cut resin composition 100% by weight, the high density polyethylene is 47 to 87% by weight; The linear low density polyethylene is 8 to 48% by weight; It is preferable that the pigment comprises 1 to 6% by weight in order to easily distinguish the cutout with the naked eye.

The cutout resin composition further comprises an additive in which polystyrene and butadiene rubber are mixed, and the additive is preferably 1 to 70 parts by weight based on 100 parts by weight of the high density polyethylene, for easier cutting and high temperature sterilization. Do.

The plastic bag substrate is preferably made of a high-density polyethylene alone or a plastic bag resin base composition mixed with linear low-density polyethylene for the production of a plastic bag with high temperature sterilization properties.

In addition, the cuttable plastic bag is preferably formed with at least one horizontal cut portion at one end of the left and right both ends of the cut portion so that the cut portion is easily cut.

Method for producing a cuttable plastic bag according to the present invention is a raw material feeder, a molding apparatus comprising a circular molding die for molding the raw material supplied from the raw material feeder into a plastic bag fabric and to produce a plastic bag with the plastic bag fabric A method of manufacturing a cutable plastic bag manufactured by a sealing apparatus and having a cutout portion formed in a horizontal band on a plastic bag substrate, wherein the plastic bag base resin composition and the cut resin composition are respectively transferred to the molding die through the raw material feeder. A raw material supplying step; A fabric forming step of extruding a cylindrical plastic bag fabric having a plurality of strip-shaped cuts formed at predetermined intervals in the molding die; A drying step of drying the plastic bag fabric; The dried plastic bag fabric includes a winding step of being wound on one side of the molding apparatus.

Here, the drying step is a compression step of pressing the cylindrical plastic rod support end formed in the raw material supply step is compressed and overlapped in two layers; Both ends of the compressed plastic bag fabric are cut to include a separation step of separating the plastic bag fabric into one layer, respectively, wherein the winding step is separately wound by one layer of the plastic bag fabric separated by the separation step. It is desirable for stable operation.

In addition, the method of manufacturing a cutable plastic bag, the folding step of folding the central portion of the plastic bag fabric is folded in two layers to form an opening of the plastic bag on one side of the plastic bag fabric after the winding step; A fusion step in which the plastic bag fabric is fused at regular intervals to form an opening with the opening of the plastic bag and correspond to the width of the plastic bag; The fusion is formed at a predetermined interval by the fusion step is cut, it is preferable to further include a cutting step in which a plastic bag is formed for the production of a single smooth plastic bag.

In addition, the method of manufacturing a cuttable plastic bag further comprises a cutout forming step of forming at least one horizontal cutout so that the cutout is easily cut at a location where the cutout is formed in a portion where the plastic bag fabric is fused. It is desirable to produce a plastic bag that can be easily cut to include.

According to the present invention, it is possible to provide a removable plastic bag that can be easily opened while maintaining hermeticity.

In addition, the present invention by bonding a separate cut resin composition on the plastic bag substrate, to prevent the defect that the notches or fragments of the holes are incorporated in the contents according to the formation of the notch or the hole forming process of the conventional plastic bag. Has an advantage.

In addition, the present invention can provide a cuttable plastic bag that is formed straight in a straight line without being twisted at the time of cutting for opening.

In addition, according to the present invention, by supplying the resin composition forming the cutout portion and the plastic bag-based resin composition at one time, the plastic bag formed with the cutout portion made of the resin composition can be produced simply and economically.

Hereinafter, a cutable plastic bag according to the present invention and a manufacturing method thereof will be described with reference to the accompanying drawings.

1 is a view showing a cutable plastic bag according to the present invention.

As shown in FIG. 1, the cutable plastic bag 1 according to the present invention has a cutout portion 20 formed on a plastic bag substrate 10 in a horizontal band shape, and is preferably thermally fused at both ends. The part 30 is provided.

In addition, as shown in the circular enlarged view of FIG. 1, the cutout portion 20 is formed with a fine grain in the horizontal direction, so that when the cutout portion 20 is cut along the grain, it is easily cut.

In addition, since the fusion portion 30 maintains airtightness so that the contents do not leak, the front and back surfaces of the cutout portion 20 are fused to each other, thereby making it possible to maintain a completely closed state, as well as the cutout portion 20. By it serves to help facilitate the initial cutting of the corner portion of the plastic bag (1) easily.

As described above, the conventional plastic bag seals a portion of the plastic bag base by heat sealing and forms a V-shaped notch at one end of the heat sealing part, but in the present invention, the cutout portion 20 is a plastic bag. The cutting line 20 is formed of a resin composition of a different type from the base material 10, and is formed of a material that can easily tear the cutout part 20. It was formed smoothly in a straight line in the grain direction, and was configured to facilitate cutting.

Here, the cuttable plastic bag 1 preferably has at least one horizontal cutout 21 formed at both left and right ends of the cutout 20 so that the cutout 20 is easily cut.

Since the cutout 21 is formed in the shape of a straight notch, unlike the conventional V-shaped notch, there is no fear of foreign matter mixed, and unlike the conventional straight notch, the cutout 20 itself is not easily visible. As it is possible to cut, it plays a role as an auxiliary means.

In addition, it is preferable to form at least one cutout 21 in the vertical direction within the range in which the cutout 20 is formed in order to solve the problem that the user cannot easily find the straight notch as described above. Since the user will cut the cutout 20, it will be possible to find and cut at least one of the plurality of cutouts 21.

The raw material of the plastic bag base material 10 is at least one of polyethylene (PE), polypropylene (Polypropylene, PP), orientated polypropylene (OPP) that is commonly used as a raw material of the plastic bag alone or It can be used in combination, preferably low density polyethylene (Low Density Polyethylene, LDPE), high density polyethylene (High Density Polyethylene, HDPE), linear low density polyethylene (Linear Low Density Polyethylene, LLDPE), linear high density polyethylene (Linear High Density Polyethylene, LHDPE) and a polyethylene (PE) type that uses at least one of linear medium density polyethylene (LMDPE), alone or in combination, are mainly used.

The raw material of the plastic encapsulation substrate 10 may be a high-density polyethylene (HDPE) alone or a resin composition in which linear low-density polyethylene (LLDPE) is mixed therein according to its use, when high temperature sterilization is required. If sterilization is not required, low density polyethylene (LDPE) is used alone, or a resin composition mixed with linear low density polyethylene is used.

First, the content of each raw material and the resin composition used in the cutout portion 20 when the low-density polyethylene is the main raw material as the resin composition of the plastic bag substrate 10, and then the high-density polyethylene is used as the main raw material Let's take a look at.

First embodiment

The first embodiment of the present invention is for the case of using low density polyethylene as the resin composition of the plastic bag base 10. The plastic bag base material includes a plastic bag base resin composition alone or mixed with linear low density polyethylene. It is done by

In addition, the cutout portion 20 is formed in a horizontal band shape at a predetermined position of the upper end of the substrate 10 of the plastic bag, and the cutout portion 20 is formed of a cutout resin composition including a blowing agent.

1. Plastic Bag Base (10)

The plastic encapsulation substrate 10 includes a resin composition using low density polyethylene (LDPE) alone or a mixture of the low density polyethylene and linear low density polyethylene (LLDPE).

Although low density polyethylene (LDPE) may be used alone as the resin composition of the plastic bag (10), linear low density polyethylene (LLDPE) has good tensile strength, tensile elongation, and stiffness, so that when used in combination with LDPE, LLDPE is superior to LDPE in stiffness, low temperature impact strength, and crack resistance, and is about 14 ℃ higher than LDPE in heat resistance, and exhibits effects along with other moldings such as rotational molding, extrusion molding and blow molding. For this reason, it is preferable to mix them suitably.

The weight ratio of the low density polyethylene (LDPE) and the linear low density polyethylene (LLDPE) is 100% by weight of the plastic bag resin base composition, the low density polyethylene (LDPE) is 60 to 90% by weight; The linear low density polyethylene (LLDPE) preferably comprises 10 to 40% by weight. The content of the composition is to consider the appropriate properties and economics.

2. Cutout 20

The cutout 20 is a technical feature of the present invention, and is formed in a horizontal band shape at a predetermined position required by the user of the plastic bag 1, and is made of a material that is different from other plastic bag base material 10. By constitution, it is possible to easily cut when opening the plastic bag 1, and also serves to make the cut line to be cut neatly straight.

The cutout 20 is made of a separate resin composition, unlike the resin composition forming the plastic bag base 10 so that the cutout 20 is easily cut by hand, unlike a general plastic bag. A feature of the present invention is to apply a resin composition comprising a blowing agent to form a grain with a certain directionality to it.

The material forming the cut resin composition together with the blowing agent will be no problem if the same resin mainly applied to the plastic bag base 10 is applied.

Cut resin composition in the first embodiment of the present invention comprises a low density polyethylene (LDPE) and a blowing agent, in the cut resin composition 100% by weight, the low density polyethylene is 80 to 99% by weight, preferably 90 to 97% by weight; The blowing agent comprises 1 to 20% by weight, preferably 3 to 10% by weight.

As the cut resin composition, a pigment for coloring may be further added, in which case the content of the composition is 100% by weight of the cut resin composition, wherein the low density polyethylene is 77 to 96% by weight, preferably 85 To 93 weight percent; The blowing agent is from 1 to 18% by weight, preferably from 2 to 15% by weight; The pigment comprises 1 to 6% by weight, preferably 1 to 5% by weight.

Hereinafter, each of the raw materials of the resin composition forming the cutout 20 will be described.

(1) low density polyethylene (LDPE)

Here, the use of low density polyethylene as the main raw material of the resin composition 20 of the cutout portion is performed by using the same resin as the main raw material of the plastic-bag-based resin composition as the main raw material, and similarly to the thermal expansion rate or other characteristics, thereby cutting the thermally deformed portion. This is to prevent distortion between the 20 and the plastic bag base 10.

When the content of the low-density polyethylene is 100% by weight of the cut resin composition, when the pigment is not included, 80% by weight, and when the pigment is included when the content is less than 77% by weight, the thermal expansion and other properties of the plastic bag resin composition is different. Accordingly, there is a problem of causing thermal deformation, and when the content of the pigment is not included 99% by weight, when the pigment is included more than 96% by weight of the blowing agent is reduced by that much, it will not be able to exhibit easily tearing characteristics .

(2) blowing agent

As a raw material of the cutout resin composition, the blowing agent is for imparting the 'good tearing' property of the cutout 20. Unlike the case where the blowing agent is generally combined with the polymer resin and used as an additive for producing a porous foam such as sponge or styropol, the blowing agent is added to form a grain in a certain direction, preferably in a horizontal direction to facilitate cutting. do.

In the present invention, the blowing agent is mixed with the LDPE which is the main raw material and formed on the plastic encapsulation substrate 10, thereby forming a grain having a predetermined porosity of porosity, so that the user cuts the grain in the grain direction, that is, in the horizontal direction by hand. In the case of cutting 20, the tearing line may be opened in a straight line in the cut portion formed in a horizontal band shape without breaking in the other direction, so that the plastic bag can be opened.

The blowing agent used in the present invention is a thermal decomposition organic blowing agent or inorganic blowing agent that is generally used. Examples of thermal decomposition organic blowing agents include azodicarbonamide, N, N'-dinitroso pentamethylenetetramine (DPT), N, N'-dinitroso-N, N'-dimethylterephthalic acid amide, and benzenesulfonylhydra. Zide, p-toluenesulfonylhydrazide, 4,4'-oxybisbenzenesulfonylhydrazide, benzene-1,3-disulfohydrazide, terephthalic acid azide, and the like. Sodium hydrogen, sodium bicarbonate, and ammonium chloride. In the present invention, these blowing agents are used alone or in combination.

More preferably, the blowing agent used in the present invention is a mixture of sodium hydrogen carbonate (NaHCO ₃ ) as the inorganic blowing agent and azodicarbonamide (AC) as the organic blowing agent, and specifically, the sodium hydrogen carbonate and A blowing agent mixed with azodicarbonamide was placed in low density polyethylene (LDPE, melt index of 0.5 to 50 g / 10 minutes), and a lubricant such as EBS wax and a stabilizer such as Zn-St bead type were added in an amount of 0.1 to 100 parts by weight of the blowing agent. To 5.0 parts by weight, and then polyethylene wax is added to the mixing agent as much as the input amount of the foaming agent composition, mixed into the mixer, and extruded by an extrusion apparatus (molding dies) to prepare a plastic bag. .

If the content of the blowing agent is added to 20% by weight when no pigment is included in the cut resin composition 100% by weight, 18% by weight or more when the pigment is included, there is a problem that the thermal properties of the plastic bag substrate 10 is different If it is added to 1% by weight or less, whether or not the pigment is included, there is a problem that can not exhibit the characteristics as the blowing agent.

(3) pigment

The pigment used as the cut resin composition of the present invention may be added in order that the cut portion 20 is distinguished from the plastic bag substrate 10 so that the user can easily recognize the cut portion 20, and the content thereof In 100% by weight of the cut resin composition, 1 to 6% by weight, preferably 1 to 5% by weight is added.

Second embodiment

The second embodiment of the present invention relates to the case where the high density polyethylene (HDPE) is used as the resin composition of the plastic encapsulation substrate 10. The plastic encapsulation substrate 10 is a high density polyethylene (HDPE) alone or a linear low density polyethylene ( LLDPE) and a plastic bag-based resin composition mixed with each other.

In addition, the cutout 20 includes a cut resin composition including high density polyethylene (HDPE) and linear low density polyethylene (LLDPE).

Since the plastic bag 1 formed by the second embodiment of the present invention has a higher temperature adaptability than that of the plastic bag 1 formed by the first embodiment using LDPE, high temperature sterilization is possible. Therefore, it is suitable for use for the storage of materials requiring high temperature sterilization.

1. Plastic Bag Base (10)

Although the type of the high density polyethylene (HDPE) used as the main raw material of the resin composition of the plastic bag substrate 10 is not particularly limited, in order to optimize the easily cut property of the HDPE used in the resin composition of the cutout portion 20, the cutout resin Preference is given to using those which are not aromatic, i.e. having the property of not forming a grain, as properties opposite to the HDPE of the composition. For example, it is preferable to use HDPE having a melt index (Melt Index, ASTM D1238) of 0.10 to 0.30 g / 10 minutes at a density of 0.90 to 0.95 g / cm ³ at 23 ° C. without the aromaticity. .

The use of a mixture of linear low density polyethylene (LLDPE) as the resin composition of the plastic bag substrate 10 enhances the molding and sealing properties of the plastic bag and prevents noise during cutting by utilizing the soft properties of the LLDPE. This is to improve transparency.

As described above, the plastic encapsulation base 10 resin composition may be composed of high density polyethylene alone, which is a case where special sterilization properties are required. On the other hand, when linear low density polyethylene (LLDPE) is mixed, the weight ratio of the high density polyethylene (HDPE) and the linear low density polyethylene (LLDPE) is 100% by weight of the plastic bag resin base composition, the high density polyethylene (HDPE) is 50 to 90% by weight; The linear low density polyethylene (LLDPE) preferably comprises 10 to 50% by weight. The content of the composition is to consider the appropriate properties and economics.

2. Cutout 20

The resin composition constituting the cutout 20 is made of high density polyethylene (HDPE) alone or mixed with linear low density polyethylene (LLDPE) capable of forming a grain.

If the cut resin composition excludes linear low density polyethylene (LLDPE) and consists of high density polyethylene alone, it may further include a pigment to color the user to easily identify the cut 20, in which case the cut The composition of the part 20 is 100% by weight of the cut resin composition, 94 to 99% by weight, preferably 95 to 99% by weight of high density polyethylene; It consists of 1 to 6% by weight of the pigment, preferably 1 to 5% by weight.

In 100% by weight of the cut resin composition when linear low density polyethylene (LLDPE) is mixed, the high density polyethylene is 50 to 90% by weight, preferably 60 to 80% by weight; The linear low density polyethylene comprises 10 to 50% by weight, preferably 20 to 40% by weight.

In addition, a pigment for coloring may be further added to the cut resin composition containing the linear low density polyethylene, in which case the content of the composition is 100% by weight of the cut resin composition. In the present invention, the high density polyethylene is 47 to 87% by weight, preferably 55 to 80% by weight; The linear low density polyethylene is 8 to 48% by weight, preferably 15 to 40% by weight; The pigment comprises 1 to 6% by weight, preferably 1 to 5% by weight.

(1) high density polyethylene (HDPE)

Using the high density polyethylene (HDPE) as the cutout 20 resin composition, as in the case of the first embodiment, by using the same type of raw material as the resin composition of the plastic bag substrate 10, the thermal expansion coefficient other characteristics In the same way, the cutout 20 formed on the plastic bag substrate 10 is intended to be free from thermal, chemical and mechanical external magnetic poles.

The high-density polyethylene used in the cutout 20 resin composition is used, unlike the high-density polyethylene serving as the raw material of the plastic encapsulation substrate 10, having a directivity in a predetermined direction, that is, forming a grain. The purpose of the present invention is to make it easy to cut by using a high density polyethylene capable of forming a grain. As the high density polyethylene capable of forming the grains, it is preferable to use HDPE having a melt index of 0.60 to 0.90 g / 10 minutes and a density of 0.945 to 0.955 g / cm ³ at 23 ° C.

In addition, unlike the first embodiment, the blowing agent is not used in the cut resin composition because the blowing agent is difficult to be mixed with the HDPE used as the raw material of the plastic bag substrate 10.

Therefore, in the second embodiment of the present invention, the HDPE capable of forming a grain serves as the blowing agent in the first embodiment.

The content of the high-density polyethylene that can form the grains may be used alone when sterilization properties are specifically required, and when the pigment is included therein, the content of the pigment may be in the plastic bag base 10 and the cutout portion ( 20) can be distinguished, and the optimal composition ratio within the limit does not impair the sealing of the plastic bag.

In the high-density polyethylene that can form the grain used in the present invention, by using an additive containing polystyrene and butadiene rubber as a main raw material, it is easier to cut, and can be configured to be used for high temperature sterilization treatment.

Specifically, 1 to 70 parts by weight of the additive composition consisting of the polystyrene (MPACT Polystyrene) and butadiene rubber is added to 100 parts by weight of HDPE capable of forming the grains, mixed with the HDPE in a mixer, and extruded in an extrusion apparatus Plastic bags are made using the molded material as the masterbatch.

100% by weight of the high-density polyethylene in the case of the linear low density polyethylene (LLDPE) is contained in the plastic bag resin when the content of the cut resin composition is 50% by weight without the pigment and less than 47% by weight with the pigment As the thermal expansion and other properties of the composition is different, there is a problem of causing thermal deformation and a problem of not being able to easily exhibit a tearing property, 90% by weight without a pigment, 87% by weight of a pigment When more than% is added, there is a problem in that the content of LLDPE is reduced by that and the moldability is lowered.

(2) linear low density polyethylene (LLDPE)

As the cutout 20 resin composition, the use of linear low density polyethylene improves moldability, enhances sealing properties, and cuts, as linear low density polyethylene (LLDPE) is applied to the plastic bag-based resin composition. This is to control the degree of cutting of the part, to prevent noise when cutting, and to enhance transparency, which is a disadvantage of using only HDPE.

However, since the high temperature adaptation property is lowered than when using HDPE alone, when the high temperature sterilization is particularly required, the mixing of the LLDPE is excluded and HDPE is used alone.

When the content of the linear low density polyethylene (LLDPE) is included in the cut resin composition 100% by weight, when the pigment is not included 10% by weight, when the pigment is contained less than 8% by weight easily formed There is a problem in that the molding properties can not be exhibited, when 50% by weight is not included in the pigment, 48% by weight or more when the pigment is added, HDPE which can form a grain is reduced by that much easily tear property and high temperature There is a problem that the adaptation characteristics are degraded.

(3) pigment

The pigment used as the cut resin composition of the present invention may be added in order that the cut portion 20 is distinguished from the plastic bag substrate 10 so that the user can easily recognize the cut portion 20, and the content thereof In 100% by weight of the cut resin composition, 1 to 6% by weight, preferably 1 to 5% by weight is added.

Next, a method for manufacturing the cutable plastic bag 1 according to the present invention will be described.

Figure 2 is a front view of the manufacturing apparatus for producing a tearable plastic bag according to the present invention.

As shown in FIG. 2, the manufacturing apparatus 100 for manufacturing the cutable plastic bag 1 according to the present invention includes two raw material feeders 110 and 120, and the raw material feeders 110 and 120. Molding die 130 for molding the supplied raw material into a plastic bag fabric (A), a plurality of rollers for transporting and drying the molded plastic bag fabric (A), cut both ends of the plastic bag fabric (A) to double the vinyl It consists of a cutter 142 for separating the sealing fabric (A) in one layer, the winding device 150 is provided to wind the separated plastic bag of one layer.

3A is a perspective view of the molding die 130, and FIG. 3B is a perspective view of the molding die 130.

As shown in Figure 3a, the forming die 130 is a raw material supply pipe (131a and 131b) is a raw material is transferred from the raw material feeders (110 and 120), the air supply pipe 132 is supplied with air for drying the molded vinyl fabric ), A circular substrate extrusion port 133a through which the raw material of the plastic bag substrate 10 is extruded, and a cutting member extrusion port 133b through which the raw material of the cutout 20 is extruded.

As shown in Figure 3b, the operation of the molding die 130, the cylindrical plastic bag substrate 10 is extruded from the substrate extrusion port (133a), the cutting portion 20 through the cutting member extrusion port (133b). ) Is spaced apart at regular intervals and is extruded to have a long strip-shaped connection, is carried out by forming a plastic bag fabric (A) consisting of the plastic bag substrate 10 and the cutout (20).

4, a method of manufacturing a cutable plastic bag 1 according to the present invention using the apparatus will be described. Figure 4 is a flow chart showing a method for producing a cuttable plastic bag according to the present invention.

As shown in Figure 4, the method for producing a cutable plastic bag according to the present invention, raw material supply step (S10), fabric forming step (S20), drying step (S30), winding step (S40) It includes, and the next step is to form a finished plastic bag 1 using a separate processing device after the winding step (S40), folding step (S50), fusion step (S60), It comprises a cutting step (S70).

In addition, the drying step (S30) comprises a compression step (S31) and the separation step (S32).

First, as a starting step, the raw material supply step (S10) is the resin composition of the plastic bag base material (1) and the cutout 20 resin composition of the plastic bag base material feeder 110 and the cut material feeder 120, respectively The step of feeding into the injection unit 111 is supplied to the molding die 130 by the power of the motor 112 and 122, respectively.

The motors 112 and 122 are freely controlled in power, so that the supply amount of raw materials can be freely adjusted. The injected raw material is supplied to the molding die 130 through the raw material supply pipes 131a and 131b.

The fabric forming step (S20) is a step in which a cylindrical plastic bag fabric (A) in which a plurality of strip-shaped cuts are formed at predetermined intervals while raw materials supplied to the molding die 130 are extruded upward. The shape of the plastic bag fabric (A) thus formed is as shown in Figure 5a.

The drying step (S30) is a step in which the plastic bag fabric A is exposed to the air while passing through a plurality of rollers and naturally dried.

Drying step (S30) is, as shown in Figure 5b, while the cylindrical plastic bag extruded fabric (A) is pressed by the presser 141 shown in the apparatus of FIG. S31) and both ends of the compressed plastic bag fabric A as shown in FIG. 5C are cut through the cutter 142 and are separated in a single step (S32).

After the separation step (S32) is finished, as shown in Figure 5d, each of the plastic bag fabric (B) formed in one layer is wound on each side of the winding device 150 shown in Figure 2 (S40) Is performed.

Next, a step of manufacturing a plastic bag 1 as a finished product using a processing device or a sealing device separate from the raw material manufacturing apparatus shown in FIG. 2 is performed. This may be by a conventional plastic bag manufacturing method, and the following method is presented as a preferred embodiment of the present invention.

The post process consists of a folding step (S50), fusion step (S60), cut-out forming step (S70), cutting step (S80). Here, the cutout forming step (S70) as a post-process is applied only when manufacturing the plastic bag 1 having the cutout 21 formed therein.

The folding step (S50), as shown in Figure 5e, after the winding step (S40) to form the opening (C) of the plastic bag (1) on one side of the plastic bag fabric (B) formed in one layer The center part of the bag is folded and folded in two layers.

Fusion step (S60) is as shown in Figure 5f, perpendicular to the opening (C) of the plastic bag 1 and the plastic bag fabric (B) at regular intervals corresponding to the width of the plastic bag (1) ) Is fused to form a fusion portion 30 of the plastic bag (1).

Cutting part forming step (S70) of at least one horizontal direction so that the cutout 20 is easily cut to a position where the cutout portion 20 is formed in the portion 30 to which the plastic bag fabric (B) is fused It is a step of forming the cutout 21.

When two or more cutouts 21 are formed, a plurality of cutouts 21 spaced apart from each individual straight notched cutout 21 at predetermined distances are arranged in a vertical direction.

The cut is performed by the cutting device 160 shown in Figure 5g. The cutting device 160 has a shape in which one or more cutters 161 having a triangular front face are arranged at a predetermined interval in a vertical direction, and the cutters 161 are welded portions 30 of the plastic bag fabric B. The incision 21 is formed by inserting into the ().

The cutout portion 21 is formed only within a range where the fusion portion 30 and the cutout portion 20 intersect. Since the cutter 161 is formed in a triangle, the cutter 161 is connected to the fusion portion 30. The length of the cutout 21 formed according to the depth to be inserted can be adjusted.

The plastic bag fabric B having the cutout 21 formed as described above is illustrated in FIG. 5H, in a state in which the welded portion 30 is formed at a predetermined interval, the welded portion 30 and the cutout 20. The cutout 21 is formed at the point where () is crossed.

Cutting step (S80) is a step in which the fusion unit 30 formed at a predetermined interval by the fusion step (S60) is cut, a single plastic bag (1) is formed.

It has been described in detail above with reference to preferred embodiments of the present invention. However, the scope of the present invention is not limited to the above embodiments, but may be embodied in various forms of embodiments within the appended claims. Without departing from the gist of the invention as claimed in the claims, any person skilled in the art to which the invention pertains is considered to be within the scope of the claims of the invention to the various possible modifications possible.

1 is a view showing a removable plastic bag according to the present invention

Figure 2 is a front view of the manufacturing apparatus for producing a cutable plastic bag according to the present invention

Figure 3a is a perspective view showing a molding die for producing a cutable plastic bag according to the present invention

Figure 3b is a perspective view showing the operation of the molding die for producing a cutable plastic bag according to the present invention.

Figure 4 is a flow chart showing a method for manufacturing a cutable plastic bag according to the present invention

Figure 5 is a detailed view showing a method for manufacturing a cutable plastic bag according to the present invention

<Description of Major Symbols in Drawing>

1: plastic bag 10: plastic bag base

20: cutout 21: cutout

30: fusion unit 100: plastic bag manufacturing apparatus

110: raw material feeder for plastic bags

120: cut material feeder 130: molding dice

141: presser 142: cutter

150: winding device 160: cutting device

A, B: plastic bag fabric

Claims (16)

delete delete delete delete delete A cuttable plastic bag having a cutout in a horizontal band shape on a plastic bag substrate, wherein the cutout portion is formed of a cutout resin composition composed of a high density polyethylene and a linear low density polyethylene that can form a grain, and the cutout resin composition Further comprising an additive, wherein the additive is made by mixing polystyrene and butadiene rubber, In 100% by weight of the cut resin composition, The high density polyethylene is 50 to 90% by weight; The linear low density polyethylene is 10 to 50% by weight; The additive is a removable plastic bag comprising 1 to 70 parts by weight based on 100 parts by weight of the high density polyethylene. A cuttable plastic bag having a cutout in a horizontal band shape on a plastic bag substrate, wherein the cutout portion is formed of a cutout resin composition composed of a high density polyethylene, a linear low density polyethylene, and a pigment containing color, capable of forming a grain, Further comprising an additive in the cut resin composition, wherein the additive is made by mixing polystyrene and butadiene rubber, In 100% by weight of the cut resin composition, The high density polyethylene is 47 to 87% by weight; The linear low density polyethylene is 8 to 48% by weight; The pigment comprises 1 to 6% by weight; The additive is a removable plastic bag comprising 1 to 70 parts by weight based on 100 parts by weight of the high density polyethylene. The method according to any one of claims 6 to 7, The plastic bag substrate is cuttable plastic bag, characterized in that made of a high-density polyethylene alone or a plastic bag resin base composition mixed with linear low density polyethylene. The method according to any one of claims 6 to 7, The cuttable plastic bag is a cuttable plastic bag, characterized in that at least one horizontal cut portion is formed at one end of the left and right both ends of the cutout to easily cut. delete delete delete delete delete delete delete

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