JP4079123B2 - Pouch with a branched chamber - Google Patents

Description

  The present invention relates to a pouch in which a small chamber branched from a pouch is formed on a side wall of a pouch formed of a plastic film, and a small chamber is formed at the tip of the small chamber.

In order to make it easy to take out the contents of the liquid pouch, a separate spout, for example, a plug attached to the top of the pouch, an integrally formed spout, a spout formed by heat sealing, etc. There is. In either case, there are many cases where these spouts are applied to a pouch of a three-way or four-way seal and a self-supporting pouch in which another film is sealed at the bottom to widen the bottom. Such pouches contain liquid detergents, beverages, soups, etc., but the contents are generally filled from the unsealed portion at the top of the pouch, and this portion is heat sealed and sealed. Moreover, in the use of the refillable liquid pouch, refillability is a problem, but in any of the spouts, as described above, the device for improving the refillability is elaborated at the top of the pouch. However, in conventional pouches, the portion where filling is performed and the portion where the spout is provided are in the same position or close to each other, so the device for improving the refillability is based on extremely limited conditions in terms of filling properties. The actual situation is that it has to be done and a sufficient effect has not been obtained. For example, the outlet of the refilling pouch has a shape that cannot be connected to the filling port of the bottle to be refilled, or even if it can be connected, the content will flow out immediately before the connection, and the contents are likely to spill. There is. In addition, since the plug body is expensive and the filling seal is extremely difficult, a special device is required. In addition, conventional pouches that have been devised in this way have the problem that the devised part is different in shape from the other parts, so local stress concentration is likely to occur due to drop impact, etc., and it is generally easy to break the bag. There is also.
Further, even in a pouch other than the one for refilling, since the filling port and the spout for content are at the same position on the top of the pouch as described above, there is a problem that it is difficult to improve both the filling property and the dispensing property. When taking out the contents, it could not be taken out from the side of the pouch. When it is taken out from the top of the pouch, it is necessary to turn the top of the pouch upside down, which causes problems such as the sticky contents do not come out easily or the remaining contents do not return to the original bottom.
CD-ROM of the actual application No. 4-58629

In order to solve such problems of the prior art, the present invention provides a pouch that is excellent in filling properties and excellent in taking out contents.
Another object of the present invention is to provide a pouch having a bag breaking resistance against a drop impact or the like.

The present invention
“1. In a standing pouch that is formed of a single layer or laminated film, and when the contents are filled with the gusset at the bottom of the pouch, the contents are filled at the top of the pouch. A branched chamber having an opening to be sealed after filling and at a position below the top of the pouch and extending a branch chamber by extending at least one of the side walls of the pouch to the outside, the chamber having a spout at the tip. 2. A standing pouch provided with a branched small chamber as described in 1 above, wherein a pressure absorbing space is arranged between the top of the pouch and the branching portion.
3. A standing pouch provided with the branched small chamber described in item 1 or 2, wherein the spout at the tip of the branched small chamber is sealed with an easy-open seal.
4). Items 1 to 3 wherein the pouch has a filling port for the contents to be sealed after filling the opening at the top of the pouch, and the tip of the small chamber formed by branching the side wall extending outwardly is a tapered spout. A standing pouch provided with a branched chamber according to any one of the above.
5. The branched chamber described in any one of items 1 to 4, wherein the easily openable seal portion is a seal portion obtained by heat-sealing a different type of synthetic resin sheet on the base sheet at the tip of the spout. A standing pouch.
6). Any one of items 1 to 4, wherein the easy-open seal part is a seal part in which a base material sheet is heat-sealed with a base resin sheet incompatible with the base material sheet at the tip of the spout. A standing pouch provided with a branched chamber according to the item. "
About.

Even if the shape of the spout is selected variously, the pouch according to the present invention is not limited in filling conditions, and has an excellent effect on bag breaking resistance against a drop impact.
Moreover, the content in the pouch can be easily poured out from the spout of the branched chamber.

In the present invention, at the position below the top of the pouch, at least one of the side walls of the pouch is extended outward to form a branched chamber by separating the filling port and the spout of the contents. This is because adaptation to the machine can be ensured and the shape of the spout can be selected variously.
Forming the spout integrally with the small chamber has the advantage of shortening the manufacturing process. The spout tip may be an easy-open seal that is easily opened by compressing the pouch, or a tight seal that is cut and opened. When cutting and opening, it is desirable to impart tearability to the tip of the spout, and it is preferable to use a uniaxially stretched film or to perform laser processing in order to induce the tearing direction. For the laser processing, a method such as providing a score with one or several focus beams on the outer surface layer or the intermediate layer, or providing a melt weakening line with a defocus beam or a kaleidoscope can be applied.
In addition, the tip of the small chamber has a tapered spout when the contents are poured out after the tapered spout is inserted into the opening of another container or positioned above the item to be poured. This is because inappropriate outflow can be prevented by performing pouring while applying more pressure. The taper angle of the tapered spout varies depending on the size of the pouch and the size of the container opening, because it affects the pouring of the contents and the connectivity with the target container. 150 degrees, preferably 30 to 120 degrees.
Moreover, what is poured into the wide-mouthed container does not need to have a tapered shape, and may be a pouch width spout. Furthermore, in order to prevent blocking of the spout and smooth deformation of the spout at the start of the spout, known bending processing, rib processing, press processing, embossing, and the like can be performed near the tip of the spout.

The pressure absorption space provided between the top and the branch of the pouch prevents bag breakage when unnecessary pressure or impact is applied during handling of the pouch or prevents the contents from breaking through the spout seal. It is preferable to provide this space because the effect of preventing is exhibited.
Since the pouch of the present invention may be sealed with a crushable easy-open seal that peels off with a pressure called a peelable seal so that pouring can be easily performed, if a pressure absorbing space is provided, Even if pressure due to inadvertent dropping or the like is applied, damage to the seal can be prevented by absorbing the contents that move rapidly into the pressure absorption space.
One small chamber may be formed by branching, or two or more small chambers may be provided and poured into a plurality of objects at the same time.

Further, the spout is sealed with a lid such as a lid of a stopper, a screw cap, a crown cap, a rubber stopper and an aluminum plate for fixing the outlet as required.
In addition, a separately molded plug may be heat-sealed and combined.

The chamber having the branched spout of the present invention preferably has a length of 5 to 95% of the length of the pouch.
If it is 5% or less, it is difficult to form a tapered spout, and if it is 95% or more, it is difficult to bend it along the pouch body while providing a pressure absorption space.

If the small chamber having the spout is bent along the pouch body, the easy-open seal of the spout will not be opened even if it is subjected to an impact such as dropping.
Although at least one small chamber is provided, two or more small chambers may be provided, and different seals such as an easy-open seal and a tight seal may be used for each small chamber.

The pouch of the present invention uses a flexible sheet or film that is a single layer or a laminate depending on the contents. For example, the following materials are used as the material constituting the single layer or the laminated layer.
Low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, polybutene resin, polymethylpentene resin, ionomer resin, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene -Saponified vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, polyacrylic resin, polyacrylonitrile resin, polyester resin (polyethylene terephthalate, polyethylene naphthalate, etc.), There are polyamide resin, polystyrene resin, polyvinyl chloride resin, polyvinylidene chloride resin, polycarbonate resin, fluorine resin, phenol resin, and the like.

In particular, when gas barrier properties are required depending on the contents, a layer of polyvinylidene chloride, a layer of saponified ethylene-vinyl acetate copolymer, a layer of stretched polyamide resin, a vapor deposition layer of aluminum, silicon oxide A vapor-deposited layer of metal oxide such as aluminum foil or steel foil is introduced into the laminate.
In order to impart rigidity and heat insulation, foams of these synthetic resins may be introduced into the laminate. Moreover, you may introduce | transduce the layer with which inorganic substances, such as a titanium oxide, a calcium carbonate, and carbon, were filled in these resin. In addition, a layer of paper or cardboard may be introduced.
These materials are used as a sheet or a film which is used alone or as a laminate depending on the purpose of use of the pouch of the present invention. These sheets and films are produced by a casting method, a calendar method, a melt extrusion method such as a T-die method or an inflation method, a melt coextrusion method, a dry lamination method, or the like. These sheets may be unstretched or uniaxially or biaxially stretched.
The film thickness of a single layer or laminated sheet or film varies depending on the purpose of use of the pouch, but it needs to be a film thickness that has flexibility.

  Since the pouch according to the present invention has a heat seal portion, one side of the sheet or film needs to be a resin having a heat seal property. The other surface is preferably a non-heat-sealable resin when providing a branching portion.

  Easy-open seals use heat-sealability of synthetic resins that are different from those of different types of synthetic resins. The material sheet is formed by sandwiching a layer blended with an incompatible synthetic resin and heat-sealing.

The pouch having a branched chamber according to the present invention is manufactured by various methods, and an example in the case of using a single layer sheet is shown.
The side that forms the chamber is referred to as the front side for convenience, and the opposite side is referred to as the back side.
The front side sheet is slackened in the length direction and overlapped with the back side sheet, and the slack part does not heat seal with the wall part which becomes the pouch body, but heat seals both ends in the width direction of the slack part to Form the pouch body by sealing three sides of the front and back sheets except the top. In this way, a pouch having a small chamber branched easily is manufactured.

Next, an example of a manufacturing method using a laminated sheet is shown.
A single laminated sheet is folded with the non-heat-sealable surface on the inside and the heat-sealable surface on the outside. On the other hand, the front side sheet and the back side sheet are overlapped with the surfaces having heat sealability, the folded sheet is squeezed between both seals, and the opening side end of the folded sheet is positioned as the end of both the front and back sheets. When the three sheets are sealed except for the top of the stacked sheets, the inner surface side of the folded sheet is not heat sealed, so that a branched chamber is formed, and a pouch having a branched chamber is manufactured. The end of the small chamber thus formed is cut open, and an easy-open seal part is provided in the opening, or a spout is formed by arranging a stopper. Thus, a pouch provided with a branched chamber is manufactured.

Next, an example is given and it demonstrates concretely. First, for easy understanding, FIGS. 1 to 7 and FIG. 10 explain that the filling port and the spout are separated by a general pouch instead of a standing pouch. The filling port is an opening at the top of the pouch and is sealed and satire after filling.
Next the present invention will be specifically described by way of example in FIGS. 8 and 9.

FIG. 1 shows a plastic pouch provided with a branched chamber according to the present invention, wherein 1 is a pouch body, a chamber 2 branched at a branching portion 5 is provided, and the pouch body 1 and the chamber 2 communicate with each other at the branching portion 5. Is done.
The tip of the spout 3 is sealed with a seal portion 3a. The spout tip has the same length as the width of the pouch. A pressure absorption space 4 is formed between the branch portion 5 and the top portion 6 of the pouch body 1.
In this embodiment, the spout 3 is sealed with an easily openable seal portion, but may be sealed with a tight seal portion.

FIG. 2 shows an embodiment in which the spout 3 of the embodiment of FIG. 1 is tapered. The tip of the spout 3 is sealed with a seal portion 3a. The spout 3 has a feature that it can be inserted into the mouth of a small-diameter container.
FIG. 3 is an example in which the sealing portion 3 a of the spout 3 is provided inside the tip of the spout 3 in the embodiment of FIG. 2. Thus, by providing a seal part inside, a seal part is protected by the base material sheet of a spout, and it is prevented that a seal part is damaged by the handling in a distribution process.
Moreover, you may provide in the vicinity of the branch part 5 like FIG.

FIG. 5 shows an embodiment in which seal portions 3a are installed at two locations of the spout 3 and is effective in preventing opening due to breakage of the seal portion during the distribution process.
FIG. 6 shows an embodiment in which a separately produced plug body 9 is heat sealed and joined to the tip of the spout 3. In this embodiment, it is covered with a screw cap, but other caps may be used.

FIG. 7 shows an example in which the tip of the spout is formed not at the center but at the end in the width direction. In this way, when the tapered tip is formed at the end, it becomes easy to inject into the container in which the injection port is offset from the end.
In this example, the top of the pouch is a filling port 7 and is heat sealed after filling the contents.

FIG. 8 shows an embodiment of the present invention, which is an embodiment of a standing pouch provided with a branched chamber 2.
FIG. 9 is a sectional view of the standing pouch of the embodiment of FIG. A gusset portion 8 is arranged to provide independence.

FIG. 10 shows an embodiment in which two small chambers are provided. Two small chambers 2 branched from the pouch body 1 at the branch portion 5 are disposed. In this example, a spout having a different width is provided in each small chamber, and the spout can be selected according to the size of the target container port.
The tip of the spout 3 of the small chamber 2 is sealed with a seal portion 3a. However, the seal portion 3a may be a crush easily openable seal or a tight seal, and the seals of the two spouts 3 may be the same seal. You may change it again. When an easy-open seal and a tight seal are used in combination, only one spout can be opened at the time of pressure opening, so that selective opening can be performed.

Example 1
As the pouch body material, a laminate in which a biaxially stretched nylon film having a thickness of 15 μm and a linear low density polyethylene film having a thickness of 150 μm were laminated with a urethane-based adhesive from the outer layer was used. .
The pouch is provided with a spout at the tip of the branched chamber shown in FIG. 2. The width is 90 mm, the height is 200 mm, the peripheral heat seal part is 5 mm wide, the branch part is 35 mm from the top of the pouch, and the width of the pressure absorption space is The standing pouch is 30 mm, the chamber has a tapered shape, the spout at the tip is 20 mm wide, 50 mm from the branch, and is tightly sealed with a width of 10 mm.
The top of the pouch was filled with 150 ml of liquid detergent and sealed by heat sealing.
In addition, the opening start portion at the tip of the spout was provided with a score that cuts only the U notch and the outer layer at a position of 12 mm from the tip of the spout for easy opening. The score was formed by processing with a carbon dioxide laser.
When the spout of the pouch of Example 1 was torn open from the U-notch portion, it could be easily opened along the score. Next, the tip of the spout was inserted into a detergent bottle having a diameter of 22 mm (inner diameter), and the contents were transferred by inverting the pouch. As a result, the contents could be transferred to the end without spilling.

Example 2
The pouch was the same as in Example 1 except that the tip of the spout was an easy-open seal. The easy-open sealing material has a width having a low-density polyethylene layer having a thickness of 20 μm and a blend layer having a thickness of 7 to 8 μm on both sides of the layer and having a weight ratio of low-density polyethylene and polybutene-1 of 80:20. A 13 mm co-extruded film was used.
The small chamber along the side wall of the main body is tilted to the top of the pouch, and the top of the pouch is turned upside down while being bent along the side wall of the main body. The spout is inserted into the same bottle as used in Example 1, and When compressed, the easy-open seal was easily broken and the contents could be transferred without spilling. When this easy-open strength was measured by the same method as in the compression test described later, it was 23 kgf on average. Further, the T peel strength of the easy-open seal portion was measured according to JIS Z 0238, and it was 170 gf / 15 mm on average.

Example 3
A pouch similar to that of Example 2 was used except that it was sealed with an easy-open seal at a position 10 mm from the branch portion toward the tip of the spout.

Example 4
The pouch was the same as in Example 2 except that the position of the branch portion was near the top of the pouch and the width of the pressure absorption space was 2 mm.

Example 5
The same procedure as in Example 4 was conducted except that the tip of the spout was fixed to the pouch body with a 18 mm wide mending tape manufactured by Sumitomo 3M.

Comparative Example 1
The pouch material was the same as in Example 1, and the pouch had a width of 90 mm and a height of 245 mm, and was tapered from the position at the top of 185 mm from the bottom of the main body toward the top without providing a branched chamber. A spout having a width of 20 mm was provided at the tip, and the same easily peelable sealing material as in Example 2 was used, and the end was sealed with an easily openable seal having a width of 10 mm. The filling seal of the contents was filled with 150 ml of liquid detergent from the top of the pouch using a funnel, and then the easy-open seal part was heat sealed.
The easy opening strength of all pouches was 23 kgf on average. The T peel strength of the easy-open seal part at the tip of the spout was 170 gf / 15 mm on average.

Comparative Example 2
Comparative Example 1 was the same as that of Comparative Example 1 except that the upper part of the pouch was bent along the side wall at a position 60 mm from the pouch tip, and the spout tip was fixed to the pouch side wall with a mending tape having a width of 18 mm.

Comparative test About the pouch of Examples 1-5 which provided the branched chamber by this invention, and the pouch of the comparative examples 1 and 2 which provided the spout in the top of the pouch without providing the branched chamber as follows, a drop test is as follows And compression tests.

  In the drop test, at an atmospheric temperature of 23 ° C., from a position of 120 cm in height, the pouch was dropped 100 times so that the side wall of the pouch hits the floor surface, and the opening of the easy-open seal part and the destruction of the pouch body were visually evaluated. The number of samples was 50. The evaluation results are shown in Table 1.

(註)
Number of samples 50 each Drop count 100 times Height 120cm
Dropped in the horizontal direction (In Examples 1 to 5, the film was dropped with the side wall provided with the branched chambers facing upward).
Atmospheric temperature 23 ° C

  In the compression test, the pouch was squeezed between two transparent and smooth acrylic plates sufficiently larger than this at an atmospheric temperature of 23 ° C., and compressed at a compression rate of 50 mm / min. When the load was measured. The opening of the easy-open seal part was judged by visual inspection through an inflection point appearing on the recorder and an acrylic plate. In addition, the load was evaluated when the pouch main body broke before the easy-open seal part opened. The number of samples was 10 each. The evaluation results are shown in Table 2.

(註)
10 samples each Compression speed 50mm / min
Atmospheric temperature 23 ° C

Evaluation

Drop Test In the pouch of Example 1, an opening score was provided at the tip of the spout, but none of the bags was broken. In addition, in the pouches of Examples 2 to 5, none of the easy-opening seals was broken and opened by the drop test, and the protective property of the easy-opening seal part against the drop impact is excellent in any dimensional condition. It was. Further, when the easily peelable seal portion was observed, in Example 4, peeling of the easily peelable seal portion did not occur except that an average of 2 mm was peeled off.
On the other hand, in Comparative Example 1, the easy-open seal portions of all the pouches were opened. In Comparative Example 2, the end of the small chamber was fixed to the side wall on the pouch body side with tape so that the easy-open seal part could be protected and the folding was not extended, but the easy-open seal part There were eight that opened. Further, when the easy-open seal part was not opened, peeling of 3 mm or more occurred, and the protective property of the easy-open seal part was inferior to the examples.

Compression test The easy-open seal part was protected even if the pouch of the example was subjected to a very strong compression load of 350 to 400 kgf that would destroy the pouch body. On the other hand, in Comparative Example 2, the protection of the easy-open seal part was improved by bending than in Comparative Example 1, but the easy-open seal part opened was 260 kgf or less, compared to the Examples. It was very inferior in the protection of the easy-open seal part.
In addition, the easy-open sealing material used in Examples 2 to 5 is such that the blend layer composed of low-density polyethylene and polybutene-1 causes cohesive failure and exhibits easy peelability. A known easy-open sealing material such as an interface peeling type that peels at the heat seal interface, a type that utilizes delamination in a multilayer film composed of two or more layers, and the like can be used. Moreover, an easily openable sealing material may show easily peelable both surfaces like the easily openable sealing material used in Examples 2-5, or only one surface shows easily peelable. It may be.
Further, in Example 5, the branch portion was fixed to the side wall of the pouch body with tape, but other known fixing methods such as double-sided tape, hot melt adhesive or adhesive adhesive, hook stopper, clip, velcro tape, etc. Applicable.

  The standing pouch of the present invention is excellent in filling and taking out of the contents, and can be self-supporting, so it is excellent in display, packaging liquid products, granular materials, powders, etc., and display in stores. And widely used in packaging and sales.

It is explanatory drawing of one example of a pouch . It is explanatory drawing of the other example of a pouch . It is explanatory drawing of another example of a pouch . It is explanatory drawing of the other example of a pouch . It is explanatory drawing of another example of a pouch . It is explanatory drawing of one example of a pouch . It is explanatory drawing of the other example of a pouch . It is explanatory drawing of the Example of this invention. It is sectional drawing of the pouch of FIG. It is explanatory drawing of the other example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pouch main body 2 Small chamber 3 Spout 3a Seal part 4 Pressure absorption space 5 Branch part 6 Top part 7 Filling port 8 Machi part 9 Plug body

Claims (6)

  In a standing pouch that is made of a single-layer or multi-layer film, and when the gusset is placed at the bottom of the pouch and filled with the contents, the pouch is raised by opening the gusset. A branched chamber is formed by extending at least one of the side walls of the pouch to the outside at a position below the opening to be sealed and the top of the pouch, and the branched chamber has a spout at the tip. Standing pouch.   The standing pouch provided with the branched small chamber according to claim 1, wherein a pressure absorption space is arranged between the top of the pouch and the branch portion.   The standing pouch provided with the branched small chamber according to claim 1 or 2, wherein the spout at the tip of the branched small chamber is sealed with an easy-open seal.   The tip of the small chamber formed by the pouch being a filling port for the contents to be sealed after filling the opening at the top of the pouch and extending the side wall to the outside is a tapered spout. A standing pouch provided with a branched chamber according to any one of the above.   The branched chamber according to any one of claims 1 to 4, wherein the easily openable seal portion is a seal portion obtained by heat-sealing a different type of synthetic resin sheet on the base sheet at the tip of the spout. A standing pouch.   The easily openable seal portion is a seal portion that is heat-sealed by sandwiching a mixture layer of a synthetic resin that is incompatible with the base material sheet on the base material sheet at the tip of the spout. A standing pouch provided with a branched chamber according to the item.

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