JP2021050029A - Liquid-sealing pouch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid material-filled pouch in which the generation of pinholes is suppressed in a corner region located near both ends of an inner edge of a sealed heat-sealed portion in a corner region of a housing portion. .. SOLUTION: A pouch having a side edge seal portion formed on a pair of side edge portions, an encapsulation seal portion formed in an opening for encapsulating a liquid substance, and an accommodating portion in which the liquid substance is enclosed. The inner edge of the sealed seal portion is composed of both end portions and an inner edge main body sandwiched between both end portions, and the both end portions extend downward in the height direction of the pouch to and the inner edge main body. , A pouch characterized in that the inner edge of the side edge sealing portion is smoothly and continuously connected to the inner edge. [Selection diagram] Fig. 1

Description

The present invention relates to a pouch in which a liquid material is enclosed.

When transporting a liquid material from a remote place such as overseas, a pouch having an opening for filling the liquid material is widely used. By filling the liquid from the opening, sealing the opening with a heat seal, and enclosing the liquid in the pouch, the liquid can be transported with almost no contact with air. As a result, it is possible to prevent the liquid material from being oxidized during transportation and deteriorating in quality. The liquid-filled pouch to be transported is usually housed in a box-shaped pouch storage container.

FIG. 4 shows a conventionally used liquid-filled pouch. FIG. 5 is an enlarged view of the area A surrounded by the broken line shown in FIG. The liquid-filled pouch shown in FIG. 4 is a three-sided bag. With reference to these figures, the three-sided bag 10 before encapsulating the liquid material is formed by overlapping two films having the same material, size and shape, and the lower edge portion 100a is sealed. The first seal portion 101 formed, the second seal portion 102 formed by sealing the pair of side edge portions 100b, the opening 11 for filling the bag with the liquid material, and the liquid material are housed. It has an accommodating portion 12. After filling the accommodating portion 12 with a liquid material from the opening 11, the sealed heat seal portion 103 is formed by heat-sealing the opening portion 11, and the three-sided bag 10 (liquid) in which the liquid material is sealed in the accommodating portion 12. An enclosed pouch) is manufactured. In the conventional three-sided bag 10, the angle θ formed by the inner edge 102a of the second seal portion 102 and the inner edge 103a of the enclosed heat seal portion 103 is formed at a right angle.

The present inventor has discovered that after transporting the liquid material-filled pouch (the above-mentioned three-sided bag 10), pinholes are formed in the plurality of liquid material-filled pouches and the liquid material is leaking. Therefore, we investigated the location of pinholes in the liquid-filled pouch with pinholes. As a result, it was discovered that most of the corner regions of the accommodating portion 12 have pinholes in the corner regions H (indicated by hatching) located near both ends of the inner edge 103a. did. It is considered that this is because the corner region H of the liquid material-filled pouch rubs against the inner wall of the pouch storage container due to the shaking of the transport vehicle (ship, airplane, etc.).

Therefore, the present invention provides a liquid material-encapsulated pouch in which the occurrence of pinholes is suppressed in the corner regions located near both ends of the inner edge of the enclosed heat-sealed portion in the corner region of the accommodating portion. The purpose.

As a result of further diligent studies to solve the above-mentioned problems, the present inventors have found the following inventions. (1) A pouch having a side edge seal portion formed on a pair of side edge portions, an encapsulation seal portion formed in an opening for encapsulating a liquid substance, and an accommodating portion in which the liquid substance is enclosed. The inner edge of the sealed seal portion is composed of both end portions and an inner edge main body sandwiched between the both end portions, and the both end portions extend downward in the height direction of the pouch to include the inner edge main body. A pouch characterized in that the inner edge of the side edge sealing portion is smoothly and continuously connected to the inner edge.

(2) The pouch according to (1), wherein the sealed seal portion is an enclosed heat-sealed portion formed by heat sealing.

(3) The both ends are formed in an arc shape so that the center of curvature is located in the accommodating portion, and at the contact points between the both ends and the inner edge of the side edge seal portion, the both ends and the side edge are formed. The pouch according to (1) or (2), wherein the angle θ formed by the inner edge of the seal portion satisfies the equation θ ≦ 45 °.

(4) The pouch according to (3), wherein the radius of curvature of both ends is 0.03 times or more the shorter of the height and width of the pouch.

(5) The pouch according to any one of (1) to (4), wherein the amount of the liquid material enclosed in the accommodating portion is 30% or more of the volume of the accommodating portion.

According to the present invention, the generation of pinholes is suppressed in the corner region located near both ends of the inner edge of the enclosed heat-sealed portion in the corner region of the accommodating portion.

It is a schematic plan view of the liquid material enclosed pouch in this embodiment. It is an enlarged view of the region B surrounded by the broken line shown in FIG. It is a different shape at both ends of the inner edge of the enclosed heat seal portion. This is a conventionally used liquid-filled pouch. It is an enlarged view of the region A surrounded by the broken line shown in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic plan view of a liquid material-encapsulated pouch according to the present embodiment. FIG. 2 is an enlarged view of the area B surrounded by the broken line shown in FIG. The liquid material-encapsulated pouch in this embodiment is a three-sided bag. With reference to these figures, the three-sided bag 1 before encapsulating the liquid material is formed by overlapping two films having the same material, size and shape, and the lower edge portion 100a is sealed. A first seal portion 101 formed, a second seal portion 102 formed by sealing a pair of side edge portions 100b (corresponding to the "side edge seal portion" in claim 1), and a liquid material are placed in a bag. It has an opening 11 for filling and an accommodating portion 12 for accommodating a liquid substance. After filling the accommodating portion 12 with a liquid material from the opening 11, the encapsulating heat seal portion 104 (corresponding to the “encapsulated seal portion” in claim 1) is formed by heat-sealing the opening 11, and the accommodating portion is formed. A three-sided bag 1 (liquid material-filled pouch) in which a liquid material is sealed in 12 is manufactured. The widths of the first seal portion 101 and the second seal portion 102 can be appropriately set according to the size of the three-sided bag 1 and the like.

The inner edge 104a of the enclosed heat seal portion 104 is composed of both end portions C and an inner edge main body 104b sandwiched between both end portions C. Here, both end portions C extend downward in the height direction of the three-way bag 1 and smoothly and continuously connect the inner edge main body 104b of the enclosed heat seal portion 104 and the inner edge 102a of the second seal portion 102. .. Specifically, (1) both end portions C of the inner edge 104a are formed in an arc shape so that the center of curvature O is located in the accommodating portion 12 (see FIGS. 1 and 2), and (2) both end portions C. At the contact point P between the second seal portion 102 and the inner edge 102a of the second seal portion 102, the angle θ formed by both ends C and the inner edge 102a of the second seal portion 102 satisfies the equation of θ ≦ 45 ° (see FIG. 2). According to these configurations, in the corner region of the accommodating portion 12, the stress received when rubbing against the inner wall of the pouch accommodating container in the corner region H (indicated by hatching) located near both ends of the inner edge 104a. Is relaxed. Therefore, it is possible to suppress the occurrence of pinholes in the corner region H and suppress the quality deterioration of the enclosed liquid material.

The first seal portion 101 and the second heat seal 102 in the present embodiment are formed by various heat seal methods. The method of forming the first seal portion 101 and the second heat seal 102 can be appropriately adopted depending on the type of liquid material to be sealed, the size of the three-sided bag 1, and the like.

The sealed heat-sealing portion 104 in the present embodiment can be formed by various heat-sealing methods. Examples of the heat sealing method for forming the enclosed heat sealing portion 104 include a hot plate sealing method and an ultrasonic sealing method. In addition, the inventors of the present application have applied an impulse sealer (a current is instantly passed through a ribbon-shaped heater wire to heat the heater to generate heat until it can be heat-sealed, and heat-fused the heat-bonded object by heat conduction. It was examined to form the enclosed heat-sealed portion 104 using a wearable sealer). However, as a result of improving the heater wire so that both ends C are formed in an arc shape, the heater wire does not generate heat uniformly, and there are places where the heat fusion of the opening is not sufficient, which is not practical. Further, various sealing methods can be used as the sealing sealing method for sealing the opening of the three-sided bag 1 filled with the liquid material, but from the viewpoint of the strength of the sealing sealing portion and the ease of work. , It is preferable to seal the opening with a heat seal.

The radius of curvature R of both ends C is preferably 0.03 times or more the length of the height T and the width W of the three-sided bag 1, whichever is shorter. By setting the radius of curvature R of both ends C to 0.03 times or more the length of the shorter of the height T and the width W of the three-sided bag 1, a pinhole in the corner region H of the accommodating portion 12. Can be further suppressed.

As each film constituting the three-sided bag 1, for example, a multilayer film in which an outer layer film and an inner layer film are laminated can be used. As the outer layer film, a nylon film is used, but the film is not limited to this, and for example, a polyethylene terephthalate film is used. As the inner layer film, a linear low density polyethylene (LLDPE) film is used, but the film is not limited to this, and polypropylene, for example, is used. A film is produced by adhering an outer layer film and an inner layer film with a dry laminate adhesive. The method of adhering the outer layer film and the inner layer film is not limited to the method using a dry laminate adhesive, and for example, a method of adhering using molten polyethylene is used. Further, it is also possible to adopt a configuration in which an intermediate layer is provided between the outer layer film and the inner layer film. As the intermediate layer, for example, ethylene-vinyl alcohol copolymer (EVOH) or Al is used, but the intermediate layer is not limited to this.

The thickness of the outer layer film is not particularly limited, and can be appropriately set according to the type of liquid material, the size of the three-sided bag 1, and the like. For example, the thickness of the outer layer film can be set to 10 μm or more and 50 μm or less.

The thickness of the inner layer film is not particularly limited, and can be appropriately set according to the type of liquid material, the size of the three-sided bag 1, and the like. For example, the thickness of the inner layer film can be set to 30 μm or more and 150 μm or less.

The outer layer film, the inner layer film, and the adhesive used for adhering the outer layer film to the inner layer film may be one to which additives such as an antioxidant and a lubricant are added, if necessary.

It is preferable that the amount of the liquid material enclosed in the accommodating portion 12 is 30% or more of the internal volume of the three-sided bag 1 (volume of the accommodating portion 12). When the amount of the liquid material sealed in the storage portion 12 is less than 30% of the internal volume of the three-sided bag 1, the liquid material does not sufficiently flow into the corner region H and rubs against the inner wall of the pouch storage container. Is unlikely to occur.

In the present embodiment, the "liquid substance" includes not only a liquid but also a liquid containing a solid substance. Liquids include, for example, liquid detergents such as hand soaps, beverages such as juices, and liquid seasonings such as Worcestershire sauce. Liquids containing solid substances include, for example, foods such as nata de coco, aloe, curry and stew.

Hereinafter, examples for more specifically explaining the present invention will be shown.

In this embodiment, a multilayer film (height 400 mm, height 400 mm,) in which an outer layer film made of a nylon film having a thickness of 25 μm and an inner layer film made of a linear low density polyethylene (LLDPE) film having a thickness of 120 μm are bonded by a dry laminating method. Two sheets (width 300 mm) were used, and these were overlapped and the lower edge portion and the pair of side edge portions were heat-sealed with a width of 10 mm to manufacture a three-sided bag. Drinking water was filled as a liquid from the opening of the three-sided bag. The filling amount of drinking water was 90% of the internal volume of the three-sided bag.

(Examples 1 to 4)
After filling with drinking water, the sealed heat-sealing portion 104 in the above-described embodiment was formed in the opening using a hot plate type sealer to produce a three-sided bag (liquid-filled pouch) in which drinking water was sealed. .. In Example 1, the radius of curvature R of both ends C was 0.02 times the width of the three-sided bag. In Example 2, the radius of curvature R of both ends C was 0.03 times the width of the three-sided bag. In Example 3, the radius of curvature R of both ends C was set to 0.2 times the width of the three-sided bag. In Example 4, the radius of curvature R of both ends C was set to 0.4 times the width of the three-sided bag.

(Comparative Example 1)
After filling with drinking water, a hot plate type sealer is used to form a heat seal portion in the opening so as to be perpendicular to the heat seal portion of the pair of side edges, thereby enclosing the drinking water on three sides. A bag (liquid-filled pouch) was manufactured. That is, the liquid material-filled pouch of Comparative Example 1 is the conventional liquid material-filled pouch shown in FIGS. 4 and 5.

Four three-sided bags (liquid-filled pouches) containing drinking water manufactured in each Example and Comparative Example in a rectangular parallelepiped pouch storage container having a length x width x height of 400 mm x 300 mm x 160 mm. Stacked and packed. The following evaluation was performed on this packaged pouch storage container.

(Evaluation by vibration test)
According to the method B of JIS Z 0232, the vibration test was performed under stricter conditions than the method B. The vibration direction was triaxial, the frequency was 70 Hz, and the peak acceleration difference was 10 G. The test was carried out for 8 hours, and the state of the liquid-encapsulated pouch was visually observed every hour. As a result, if the pinhole did not occur in the corner region H in the above-described embodiment within 4 hours, it was judged that it could withstand practical use (good), and the evaluation was set to "○", 4 Those in which pinholes were generated in the corner region H within the time were evaluated as “x” as impractical (defective). Further, those in which pinholes did not occur in the corner region H within 8 hours were evaluated as “⊚” because they were considered to be very good.

(Evaluation by shaking test)
A shaking test was conducted under the conditions of a shaking speed of 170 rpm and an amplitude of 35 mm. The test was carried out for 3 hours, and the state of the liquid-encapsulated pouch was visually observed every 30 minutes. As a result, if a pinhole did not occur in the corner region H within one and a half hours, it was judged that it could withstand practical use (good), and the evaluation was "○", and the corner was evaluated within one and a half hours. Those having pinholes in the partial region H were evaluated as “x” as impractical (defective). Further, those in which pinholes did not occur in the corner region H within 3 hours were evaluated as “⊚” because they were considered to be very good.

Table 1 shows the test results in the above vibration test and shaking test.

In the vibration test, in Comparative Example 1, a pinhole was generated in the corner region H in 3 hours, and the evaluation was “x”. On the other hand, in Example 1, no pinhole was generated in the corner region H within 4 hours, and the evaluation was “◯”. Further, in Examples 2 to 4, no pinhole was generated in the corner region H within 8 hours, and the evaluation was “⊚”.

In the shaking test, in Comparative Example 1, a pinhole was generated in the corner region H in 1 hour, and the evaluation was “x”. On the other hand, in Example 1, no pinhole was generated in the corner region H within one and a half hours, and the evaluation was “◯”. Further, in Examples 2 to 4, no pinhole was generated in the corner region H within 3 hours, and the evaluation was “⊚”.

In practice, if even one of the liquid-filled pouches contained in the pouch storage container is confirmed to have a pinhole (for example, Comparative Example 1), a pinhole will occur for safety and health reasons. It is necessary to dispose of not only the liquid-filled pouch that is used, but also all the liquid-filled pouches contained in the pouch storage container. Therefore, even a liquid material-filled pouch that does not have pinholes can be discarded if it is bundled with the liquid material-filled pouch that has pinholes.
In this respect, according to the present invention, the occurrence of pinholes is suppressed as shown in the evaluation results of Examples 1 to 4, but the waste loss of the liquid material-encapsulated pouch can be significantly reduced accordingly. That is a big economic advantage.

(Modification example)
The shape of both end portions C is not limited to the shape shown in the above-described embodiment, and extends downward in the height direction of the three-sided bag 1 to include the inner edge main body 104b of the enclosed heat seal portion 104 and the inner edge 102a of the second seal portion 102. , As long as it has a shape that smoothly and continuously connects. Therefore, for example, as shown in FIG. 3, both end portions C'of the inner edge 104a may be formed in a straight line so as to be inclined downward in the height direction of the three-sided bag 1. FIG. 3 shows another shape of both ends of the inner edge of the enclosed heat-sealed portion. Even with this configuration, the same effect as that of both ends C in the above-described embodiment (suppression of pinholes by stress relaxation) can be obtained. The angle θ'formed by the both end portions C'and the inner edge 102a of the second seal portion 102 preferably satisfies the equation of 25 ° ≤ θ'≤ 65 °.

(Modification example)
In the above-described embodiment, the three-way bag is used as the liquid material-filled pouch, but the present invention is not limited to this, and a two-way bag or the like can also be used as the liquid material-filled pouch.

1: Three-sided bag 11: Opening 12: Accommodating part 100b: Side edge part 102: Second seal part 102a: Inner edge of second seal part 104: Enclosed heat seal part 104a: Inner edge of enclosed heat seal part 104b: Inner edge main body C : Both ends P: Contact

Claims (5)

A pouch having a side edge seal portion formed on a pair of side edge portions, an encapsulation seal portion formed in an opening for encapsulating a liquid substance, and an accommodating portion in which a liquid substance is enclosed.
The inner edge of the sealed seal portion is composed of both end portions and an inner edge main body sandwiched between both end portions.
The pouch is characterized in that both end portions extend downward in the height direction of the pouch and smoothly and continuously connect the inner edge main body and the inner edge of the side edge sealing portion. The pouch according to claim 1, wherein the sealed seal portion is an enclosed heat-sealed portion formed by heat sealing. Both ends are formed in an arc shape so that the center of curvature is located in the accommodating portion.
A claim that the angle θ formed by the both ends and the inner edge of the side edge seal portion at the contact point between the both ends and the inner edge of the side edge seal portion satisfies the equation θ ≦ 45 °. Item 2. The pouch according to item 1 or 2. The pouch according to claim 3, wherein the radius of curvature of both ends is 0.03 times or more the shorter of the height and width of the pouch. The pouch according to any one of claims 1 to 4, wherein the amount of the liquid material enclosed in the accommodating portion is 30% or more of the volume of the accommodating portion.

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