JP2022095260A - Pressurization pouch - Google Patents

Abstract

To provide a pressurization pouch which can be easily opened by a hand even when a high inner pressure is applied to the pressurization pouch.SOLUTION: A pressurization pouch 1 for housing and storing contents in a state of pressurized to a pressure higher than an atmospheric pressure makes sealant layers of a surface laminate 2 and a rear face laminate 3 each having a gas barrier layer and a sealant layer face each other, thermally seals its peripheral edge part, and is obtained by forming a storage part 10 and a seal part, the seal part has a notch 7 as an opening start part, a non-sealed deformation processed part 8 overhanging toward the notch from the storage part is provided between the notch and the storage part, and an angle (opening angle α) formed by the surface laminate and the rear face laminate at a point that a break of the sealed part starting from the notch reaches the deformation processed part is 100° or less.SELECTED DRAWING: Figure 1

Description

The present invention relates to a pouch that is filled with gas and used under pressure, and more particularly to a pressurized pouch that can be easily opened by hand.

A tennis ball is stored in order to stably store an article that is filled with pressurized gas, such as a tennis ball, and whose internal gas gradually escapes when left at atmospheric pressure. It is necessary to fill the inside of the container with a pressurized gas to prevent the gas inside the tennis ball from escaping.

Nitrogen gas is sealed inside a game tennis ball called a pressure ball, and if left in the air, the nitrogen gas inside will gradually escape and the internal pressure will drop, so conventional new tennis balls have been replaced with metal cans. It is common practice to store in a sealed container, enclose nitrogen in a can, and store in a state where the pressure is increased. As the pressure, a gauge pressure of about 0.1 MPa is required.

Since metal cans are expensive, various attempts have been made to replace metal cans with cheaper packaging. The plastic blow-molded container described in Patent Document 1 is a plastic biaxially stretched blow-molded container having a wide-mouthed opening, and has a convex portion inside the vicinity of the container opening to prevent the contents from popping out. It is a plastic blow-molded container characterized by being provided. Since this container uses an aluminum lid as a lid, it has a drawback that it is troublesome to separate the container at the time of disposal.

The package described in Patent Document 2 and the method of enclosing gas in the package are intended to realize a container for tennis balls by further using a flexible packaging bag, and also a method of enclosing air in the packaging bag. It is described. This package has succeeded in preventing the enclosed gas from coming out by using a gas barrier film that does not easily allow gas to permeate, and since it uses only plastic materials, it does not need to be sorted at the time of disposal. Therefore, it is also advantageous in terms of manufacturing cost as compared with the plastic blow-molded container described in Patent Document 1.

On the other hand, as a method of opening the packaging bag, it is generally practiced to provide a notch for starting opening at any part of the seal portion and to make a tear in the laminate from the notch to tear the seal portion. However, in a packaging bag to which internal pressure is applied, such as the packaging described in Patent Document 2, since the laminate rises at a steep angle at the inner end of the sealing portion, a rift is formed there after passing through the sealing portion. There was a problem that it stopped.

Japanese Unexamined Patent Publication No. 7-256738 Japanese Unexamined Patent Publication No. 2012-11156

An object to be solved by the present invention is to propose a pressure pouch that can be easily opened by hand even in a pressure pouch under a high internal pressure.

As a means for solving the above problems, the invention according to claim 1 is a pressurized pouch for storing and storing the contents in a state of being pressurized to a pressure higher than the atmospheric pressure, and each is a gas barrier. The sealant layers of the front surface laminate having the layer and the sealant layer and the sealant layer of the back surface laminate are opposed to each other, the peripheral edge portion is heat-sealed to form a storage portion and a seal portion, and the seal portion serves as an opening start portion. It has a notch, and between the notch and the storage portion, there is an unsealed deformed portion protruding from the storage portion toward the notch, and the cut of the seal portion starting from the notch reaches the deformed portion. It is a pressure pouch characterized in that the angle (opening angle α) formed by the front surface laminate and the back surface laminate is 100 ° or less.

In the pressure pouch according to the present invention, an unsealed deformed portion protruding from the storage portion toward the notch is provided between the notch and the storage portion, so that the cut of the seal portion starting from the notch is deformed. The angle (opening angle α) formed by the front surface laminated body and the back surface laminated body at the point where the portion is reached can be set to 100 ° or less, and the opening property is improved.

Further, in the invention according to claim 2, the diameter of the short side of the pouch at the time of pressurization is (D), the inner dimension of the long side of the pouch is (L), and the deformed portion is formed from the center of the long side of the pouch. The pressure pouch according to claim 1, wherein A> D when the distance to the center is (A).

In the pressure pouch according to the present invention, the unsealed deformed portion is provided between the notch which is the opening start portion and the storage portion, so that the cut of the sealed portion starting from the notch reaches the deformed portion. The angle formed by the front surface laminate and the back surface laminate at the point (opening portion angle) is 100 ° or less, and as a result, the cut of the seal portion smoothly shifts to the front surface laminate and the back surface laminate, and the opening is easily performed. Will be.

As in the invention according to claim 2, the diameter of the short side of the pouch at the time of pressurization is (D), the inner dimension of the long side of the pouch is (L), and the deformed portion is formed from the center of the long side of the pouch. When the distance to the center is (A) and A> D, the opening position is farther from the center of the pouch, so that the opening property is better.

FIG. 1 is a plan explanatory view showing the structure of the pressure pouch according to the present invention, the dimensions of each part, and the like. FIG. 2 is a schematic cross-sectional view showing a cross section of FIG. 1 BB', and is an explanatory view of an opening angle α. FIG. 3 is a schematic cross-sectional view showing the CC'cross section of FIG. 1, and is an explanatory view of the diameter D of the short side and the opening angle α when the deformed portion is not present. FIG. 4 is an enlarged plan schematic view showing an example of the shape of the deformed portion. FIG. 5 is an enlarged plan schematic view showing another example of the shape of the deformed portion. FIG. 6 is an enlarged plan schematic view showing another example of the shape of the deformed portion. FIG. 7 is an enlarged plan schematic view showing another example of the shape of the deformed portion. FIG. 8 is an enlarged plan schematic view showing another example of the shape of the deformed portion.

Hereinafter, the pressure pouch according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a plan explanatory view showing the structure of the pressure pouch 1 according to the present invention, the dimensions of each part, and the like. FIG. 2 is a schematic cross-sectional view showing a cross section of FIG. 1 BB', and is an explanatory view of an opening angle α. FIG. 3 is a schematic cross-sectional view showing the CC'cross section of FIG. 1, and is an explanatory view of the diameter D of the short side and the opening angle α when the deformed portion is not present.

The pressurized pouch 1 according to the present invention is a pressurized pouch for storing and storing the contents in a state of being pressurized to a pressure higher than the atmospheric pressure, and is a surface laminate 2 having a gas barrier layer and a sealant layer, respectively. And the sealant layers of the back surface laminate 3 face each other, and the peripheral edge portion is heat-sealed to form the storage portion 10 and the seal portion. In this example, the seal portions are formed on the four sides of the top seal portion 4, the side seal portions 5, 5, and the bottom seal portion 6. A three-way seal bag with only one side seal may be used.

In the example shown in FIG. 1, a check valve 9 is attached to the top seal portion 4. The check valve is a valve for storing contents such as a tennis ball in a pouch, heat-sealing the peripheral portion, and then press-fitting nitrogen gas from the peripheral portion. The check valve can inject gas from the outside to the inside, but the injected gas does not leak from the inside to the outside. As the check valve, a known check valve can be used.

The side seal portion 5 has a notch 7 serving as an opening start portion, and an unsealed irregularly shaped portion 8 protruding from the storage portion 10 toward the notch 7 is formed between the notch 7 and the storage portion 10. ing. As shown in FIG. 2, in the pressure pouch according to the present invention, the angle formed by the front surface laminated body 2 and the back surface laminated body 3 at the point where the cut of the side seal portion 5 starting from the notch 7 reaches the deformed processed portion 8. It is characterized in that (opening angle α) is 100 ° or less.

FIG. 3 is a schematic cross-sectional view showing a cross section taken along the line CC'of FIG. 1, and is an explanatory view of the diameter D of the short side. This is also an explanatory diagram of the opening angle α when the deformed processing portion 8 does not exist. In the absence of the deformed portion, the cross section of the pouch is substantially circular.

As is clear from the comparison between FIGS. 2 and 3, due to the presence of the deformed portion 8, the surface at the point where the cut of the side seal portion 5 starting from the notch 7 reaches the deformed portion 8 at the end of the seal portion. It can be seen that the angle formed by the laminated body 2 and the back surface laminated body 3, that is, the opening angle α is clearly smaller than that in the case of FIG.

The opening angle α is a value close to about 180 ° when the deformed processing portion 8 does not exist, but it becomes a small value by providing the deformed processing portion. As a result of various studies, it was found that the opening property is good when the opening angle α is 100 ° or less.

If the opening angle α exceeds 100 °, there is a risk that the cut that has advanced through the seal portion will not advance when it reaches the storage portion.

4 and 5 are schematic enlarged plan views showing an example of the shape of the deformed processing portion 8. In the example of FIG. 4, the shape of the deformed portion 8 is close to half of the elliptical shape. In the example of FIG. 5, it is a rectangle. The shape of the deformed portion 8 is not particularly limited, and may be any shape as long as the opening angle α is 100 ° or less. 6 to 8 are schematic enlarged plan views showing an example of the shape of the deformed processing portion 8.

The configuration of the laminated body used for the pressure pouch 1 according to the present invention will be described. The basic structure of the laminate is a base film / gas barrier film / sealant film, but the base film and the gas barrier film may be common. Further, in order to improve the overall strength, an intermediate layer can be added as appropriate.

Various synthetic resin films can be used as the base film constituting the laminate. Specifically, stretched polypropylene resin (OPP), polyethylene terephthalate resin (PET), polybutylene terephthalate resin (PBT), polyethylene naphthalate resin (PEN), polymethylmethacrylate resin (PMMA), ionomer resin, nylon-6. , Nylon-66, polystyrene resin (PS), polyvinyl chloride resin (PVC), polyvinylidene chloride resin (PVDC), polycarbonate resin (PC) and other thermoplastic resin films can be used.

Examples of the gas barrier film include gas barrier films such as polyvinylidene chloride film, polyvinyl alcohol film, ethylene vinyl alcohol copolymer film, gas barrier nylon film, and gas barrier polyethylene terephthalate (PET) film, and metal such as aluminum in PET film and the like. A metal vapor-deposited film, a PET film on which an inorganic oxide such as aluminum oxide or silicon oxide is vapor-deposited, a polyvinyllidene chloride coating, a film containing a water-soluble resin and an inorganic layered compound, or A gas barrier coating layer such as a resin layer made of a film obtained by reacting a metal alkoxide or a hydrolyzate thereof with an isocyanate compound can be used. Among them, an inorganic oxide-deposited film obtained by depositing an inorganic oxide such as aluminum oxide or silicon oxide on a PET resin film can be preferably used. It has been confirmed that aluminum foil, which is generally used as a gas barrier layer for packaging materials, may have fine cracks due to tension caused by internal pressure of the pouch.

As the sealant film, a polyolefin resin is generally used. Specifically, low-density polyethylene resin (LDPE), medium-density polyethylene resin (MDPE), linear low-density polyethylene resin (LLDPE), ethylene-vinyl acetate copolymer (EVA), ethylene-α-olefin copolymer. , Ethylene-based resins such as ethylene-methacrylic acid resin copolymers, blended resins of polyethylene and polybutene, homopolypropylene resins (PP), propylene-ethylene random copolymers, propylene-ethylene block copolymers, propylene- Polypropylene resin such as α-olefin copolymer is used.

As the intermediate layer, a synthetic resin film similar to the synthetic resin film used as the base film can be used. Each of these layers can be bonded using a dry laminating adhesive. Hereinafter, a more specific description will be given based on the examples.

<Example 1>
An inorganic vapor-deposited film (GL film manufactured by relief printing company) in which silicon oxide is vapor-deposited on a 12 μm-thick PET film substrate is used as a substrate film and a gas barrier film, and a 25 μm-thick nylon film is used as an intermediate layer. , And an LLDPE film having a thickness of 120 μm as a sealant layer was used, and these were dry-laminated using an adhesive to prepare a laminated body.

A pressure pouch was prepared by heat-sealing four circumferences of the laminate. At the lower part of the side seal portion, a deformed portion having a shape as shown in FIG. 6 and a notch are provided. The seal portion was diagonally increased at the corner portion, and the angle of the elliptical deformed portion was inclined along the diagonal seal portion. The opening width of the deformed portion is 30 mm, and the depth is 10 mm. A check valve was attached to the top seal. Air was injected into the pouch from the check valve so as to be 0.1 MPa, and the openability from the notch was evaluated. The opening angle α was 100 °.

<Example 2>
The shape of the deformed portion was changed as shown in FIG. 7, and the opening to the storage portion was narrowed. The opening width of the deformed portion is 20 mm, and the depth is 10 mm. Other than that, a pressure pouch was produced in the same manner as in Example 1. The opening angle α was 95 °.

<Example 3>
The shape of the deformed portion was changed as shown in FIG. 8, and the opening to the storage portion was narrowed to form a constricted shape. The opening width of the deformed portion is 3 mm, and the depth is 10 mm. The width of the elliptical deformed portion is 10 mm. Other than that, a pressure pouch was produced in the same manner as in Example 1. The opening angle α was 10 °.

<Comparative Example 1>
A pressure pouch was produced in the same manner as in Example 1 except that the deformed portion was not provided. The opening angle α was 140 °.

<Reference example>
When the deformed part is not provided and air is not injected. The opening angle α is 0 °. The above results are summarized in Table 1.

<Evaluation of openness>
⊚: When the seal is cut with the same force as the force to cut the seal from the notch.
〇: When it was not possible to cut open with the same force, but it was easy to cut.
△: A large amount of force is required, but if you manage to cut it.
×: When the seal cannot be cut because it is caught at the end point.

From this result, it can be seen that the openability is improved by providing the deformed processed portion.

1 ... Pressurized pouch 2 ... Front laminated body 3 ... Back surface laminated body 4 ... Top seal part 5 ... Side seal part 6 ... Bottom seal part 7 ... Notch 8 ...・ Deformed part 9 ・ ・ ・ Check valve 10 ・ ・ ・ Storage part D ・ ・ ・ Diameter of the short side of the pouch L ・ ・ ・ Inner dimension of the long side of the pouch A ・ ・ ・ From the center of the pouch to the deformed part Distance α ・ ・ ・ Opening angle

Claims (2)

It is a pressure pouch for storing and storing the contents in a state of being pressurized to a pressure higher than the atmospheric pressure, and the sealant layers of the front surface laminate and the back surface laminate having the gas barrier layer and the sealant layer are opposed to each other. , The peripheral portion is heat-sealed to form a storage portion and a sealing portion, and the sealing portion has a notch that serves as an opening start portion, and is directed from the storage portion to the notch between the notch and the storage portion. It has an unsealed deformed portion that overhangs, and the angle (opening angle α) between the front laminate and the back laminate at the point where the cut of the seal starting from the notch reaches the deformed portion is 100 ° or less. Pressurized pouch characterized by being. When the diameter of the short side of the pouch under pressure is (D), the inner dimension of the long side of the pouch is (L), and the distance from the center of the long side of the pouch to the center of the deformed portion is (A). , A> D. The pressurized pouch according to claim 1.

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