JP7326750B2 - package - Google Patents

Description

The present invention relates to a package intended to be filled with liquid.

2. Description of the Related Art In recent years, packaging bodies for filling liquids such as inks, adhesives, and curing agents have been known. For example, Patent Literature 1 describes, as a laminate used for such a package, a laminate using aluminum foil in order to ensure water vapor barrier properties and light shielding properties.

Japanese Patent No. 5918462

Depending on the package, when a liquid such as ink, adhesive, or curing agent is filled, the components contained in the liquid may permeate the package, reducing the lamination strength between the layers of the package. In addition, there is a possibility that the components contained in the liquid permeate, and the sealing strength of the package may be lowered if the package has a heat-sealed portion.

The present disclosure has been made in consideration of the above, and suppresses a decrease in the lamination strength between the layers of the package, and suppresses a decrease in the seal strength when the package has a heat-sealed portion. By doing so, the main purpose is to provide a good package.

The present disclosure is a package for liquid filling, comprising an inner bag including an inner film and an outer bag including an outer film located outside the inner bag, wherein the inner film is , both main surfaces are heat-sealable, the outer film has a gas barrier film and a heat-sealable film, and the outer film, the inner film, A package is provided in which the inner film and the outer film are directly joined in this order.

Further, in the package of the present disclosure, the outer film has the gas barrier film, the adhesive layer, and the heat-sealable film from the outside of the package toward the inner bag, and the outer film It is preferable that the adhesive layer closest to the heat-sealable film in the thickness direction is closer to the heat-sealable film than the gas barrier film closest to the heat-sealable film.

Further, in the package of the present disclosure, a first welded portion where the first inner film and the heat-sealable film of the outer film are joined, and a second welded portion where the inner films are joined and the length from the edge of the first weld is longer than the length from the edge of the second weld.

Moreover, in the package of the present disclosure, the inner film is preferably a polyethylene film.

Moreover, in the package of the present disclosure, the gas barrier film is preferably a film having a gas barrier film on at least one surface of a metal foil or a resin substrate.

Moreover, the package disclosed above is preferably any one of a flat pouch, a gusseted pouch, and a stand pouch.

The present disclosure also provides a pouch having the wrapper and an inkjet ink or adhesive filled in the wrapper.

According to the present disclosure, when the package is filled with a liquid, the decrease in the strength of the laminate film between the layers of the outer film is suppressed, and if the package has a portion heat-sealed, the seal strength is reduced. suppress

1 is a schematic plan view showing an example of a package of the present disclosure; FIG. 1 is a schematic cross-sectional view showing an example of a package of the present disclosure; FIG. FIG. 4 is a schematic cross-sectional view showing another example of the package of the present disclosure; 1 is a schematic cross-sectional view showing an example of a multiple film in the present disclosure; FIG. FIG. 4 is an explanatory diagram showing an example of the shape of the package of the present disclosure; FIG. 5 is a diagram showing changes in tensile stress with respect to chuck-to-chuck distance S1.

Hereinafter, the package of the present disclosure and the pouch filled with liquid in the package will be described in detail. Note that the present disclosure is not limited to the following embodiments.

In the package in the present specification, the liquid-filled side may be referred to as "inner", and the side opposite to the inner film with respect to the outer film may be referred to as "outer". In addition, the expression "directly joined" may be used, and "directly joined" refers to a state in which surfaces to be joined are joined without an adhesive intervening therebetween.

(package)
First, the package of the present disclosure will be described.

A package of the present disclosure is for filling a liquid, and has an inner bag containing an inner film and an outer bag containing an outer film positioned relatively outside the inner bag, The inner film is heat-sealable on both major surfaces, and the outer film has a gas barrier film and a heat-sealable film. In addition, at least a portion of the edge portion of the package is directly bonded with an outer film, an inner film, an inner film, and an outer film in this order.

A package of the present disclosure will be described with reference to the drawings. FIG. 1 is a schematic plan view showing an example of the package of the present disclosure. As illustrated in FIG. 1 , the package 1 of the present disclosure is for filling with liquid and has a spout 4 , an inner bag 30 and an outer bag 31 . Moreover, the package 1 has a double bag structure in which the inner bag 30 and the outer bag 31 are overlapped.

The package 1 exemplified in FIG. 1 is formed by placing two multiple films 2 in which an inner film 20 and an outer film 21 are superimposed on each other and by heat-sealing the edge portions 3 excluding the spout 4 . . The edge portion 3 of the package 1 has a joint portion 10 in which the outer film 21, the inner film 20, the inner film 20, and the outer film 21 are directly joined in this order.

By providing both the inner bag and the outer bag, the package of the present embodiment has a space between the inner bag and the outer bag, and even when the liquid component permeates the inner bag, the outer bag can be It suppresses the permeation of the liquid component of The outer bag of the package of the present disclosure has an outer film. By suppressing the permeation of the liquid component into the outer bag, it is possible to suppress a decrease in the laminate film strength between the layers of the outer film.

FIG. 2 is a schematic cross-sectional view of the package of FIG. 1 taken along the AA' plane. As illustrated in FIG. 2, the joint 10 has a first joint 50 where the outer film 21 and the inner film 20 are joined together, and a second joint 51 where the inner films 20 are joined together. .

In the packaging body of the present embodiment, by providing the joint part at the peripheral part, the contact between the liquid component and the second joint part when filled with liquid is minimized, and the liquid component seals the second joint part. A decrease in strength can be suppressed.

It is not clear why the liquid component reduces the seal strength of the second joint, but when the inner films are joined together by heat welding, the heat applied causes the crystallinity of the resin constituting the second joint to change. , the entanglement of the molecular chains is considered to decrease. For this reason, the second joint portion is more likely to contain a liquid component than the portion of the inner film that is not heat-sealed. It is presumed that the seal strength of the joint is lowered. For this reason, when the package has a portion that is heat-sealed, by providing the joint portion at the peripheral portion, it is possible to suppress a decrease in the seal strength.

The present disclosure also provides that the length from the edge of the first joint 50 (dashed line 1) is greater than the length from the edge of the second joint 51 (dashed line 2), as shown in FIG. It is more preferable to form By making the second joint 51 longer than the first joint 50, the length from the edge 3 is longer than the first joint 50, so that when the liquid-filled package 1 is unsealed, cutting at the BB' portion is avoided. It becomes possible. By cutting at the BB' section, the number of cut sheets is reduced to 2 compared to cutting at the CC' section shown in FIG. because it becomes easier.

FIG. 4 is a schematic cross-sectional view showing one example of a multiple film in the present disclosure. The multilayer film 2 shown in FIG. 4 has an inner film 20 and an outer film 21 , the outer film 21 having a heat-sealable film 41 , an adhesive layer 42 , a gas barrier film 43 and a protective film 44 .

Also, in the outer film 21 in FIG. 4, the adhesive layer 42 closest to the heat-sealable film 41 is positioned closer to the heat-sealable film 41 than the gas barrier film 43 closest to the heat-sealable film 41. 41 side.

In a general package that does not have an inner film, if the adhesive layer is arranged inside the gas barrier film, the liquid component filled in the package will permeate the package and dissolve the adhesive layer, resulting in the lamination. A reduction in strength may occur. On the other hand, by providing the inner film as in the present disclosure, it is possible to suppress the decrease in the lamination strength between the layers of the package even when the adhesive layer is arranged inside the gas barrier film. If the package has a heat-sealed portion, it is possible to suppress a decrease in seal strength, and as a result, a good package can be obtained.

The configuration of the package will be described in detail below.
1. Package The package of the present disclosure is for filling a liquid and has an inner bag including an inner film and an outer bag including an outer film positioned outside the inner bag relative to the inner bag. there is
2. Inner Bag, Inner Film The inner bag in the present disclosure is a bag-shaped inner film. The inner film is arranged at a position in direct contact with the liquid when the liquid is filled.

The inner film may be composed of a material that can be heat-sealed on both main surfaces. The inner film is preferably composed of a thermoplastic resin as long as both main surfaces are melted by heating so that the inner films can be bonded to each other or to the outer film. The inner film may be a single layer, or a multi-layer body in which layers made of the same material or layers made of different materials are laminated.

As the material constituting the inner film, in the case of a single layer, for example, polyethylene such as linear short-chain branched polyethylene (LLDPE), low-density polyethylene (LDPE), and polyolefin-based film such as unstretched polypropylene (CPP) Examples include resins such as resins, polyvinyl acetate-based resins, polyvinyl chloride-based resins, poly(meth)acrylic-based resins, and urethane resins.

In the present disclosure, among the above resins, polyethylene such as LLDPE and LDPE, polyolefin resin such as CPP, and the like are preferably used as materials for heat-sealable films.

If the inner film is a multilayer body, it is preferably a multilayer coextruded film. Multilayer coextruded films include LDPE and LLDPE layers on one or both sides of an ethylene vinyl alcohol copolymer (EVOH) layer, nylon (Ny) layer, cycloolefin copolymer (COC) layer, cycloolefin polymer (COP) layer, etc. A layer arrangement is preferred. Among them, a five-layer coextruded film of an LLDPE layer, a polyolefin resin layer, an EVOH layer, a polyolefin resin layer, and an LLDPE layer is particularly preferable. This is because the use of the EVOH layer in the multilayer coextruded film makes it possible to impart gas barrier properties to the inner film, thereby further enhancing the gas barrier properties of the entire package.

The inner film is preferably a film in which the components of the inner film do not dissolve into the liquid, or are difficult to dissolve. For this reason, it is preferable that the layer that is in contact with the liquid when filled with the liquid is made of an additive-free resin. This is because the resin component can be prevented or suppressed from dissolving into the filled liquid.

Examples of additive-free resins include additive-free polyolefins such as additive-free polyethylene, additive-free polypropylene, and additive-free polyisobutylene. In particular, additive-free polyethylene can be preferably used because of its excellent flexibility and bendability. The term "additive-free" is used in the sense that various additives generally contained in polyolefin films are not contained. Examples of such additives include antioxidants, slip agents, anti-blocking agents, etc., which act favorably during film production.

The melting point of the resin constituting the inner film is preferably in the range of 70° C. or higher and 150° C. or lower, and more preferably in the range of 95° C. or higher and 130° C. or lower. By setting the melting point of the resin constituting the inner film within the above range, it is possible to suppress peeling at the joint between the outer film and the inner film and at the joint between the inner films under the usage environment of the package. In addition, if the melting point of the resin constituting the inner film greatly exceeds the above range, heat welding must be performed at a high temperature, and the resin, etc. used for the package may deteriorate due to heat. be.
The thickness of the inner film is, for example, preferably in the range of 30 µm or more and 200 µm or less, and more preferably in the range of 80 µm or more and 150 µm or less. By setting the thickness of the inner film within the above range, it is possible to impart appropriate hardness and elasticity to the inner film, and it is possible to improve discharge aptitude when the content is filled.
3. Outer Bag, Outer Film The outer bag in the present disclosure is a bag-shaped outer film. The outer film is arranged outside relative to the inner film, and has a gas barrier film and a heat-sealable film. Also, the outer film may have layers other than the gas barrier film and the heat-sealable film.
(Gas barrier film)
The gas barrier film in the present disclosure is generally used as a gas barrier layer, such as a film having a metal foil, a resin substrate, and a barrier film containing an inorganic material disposed on at least one side of the resin substrate. can also By using such a gas barrier film, it is possible to prevent leakage of contents and gas generated from the contents, and prevent inflow of water vapor, oxygen, etc. from the outside of the package.
Metal foils include, for example, metal foils of aluminum, nickel, stainless steel, iron, copper, titanium, and the like.

Examples of the inorganic substance constituting the barrier film include inorganic compounds such as metals, metal oxides, and inorganic oxides such as silicon oxide. The barrier film may be a coating film or a vapor deposition film, but the vapor deposition film is particularly preferable. Moreover, the resin base material of the film having a barrier film is not particularly limited, and for example, a known resin base material such as a PET film can be used.

As a film having a barrier film, a barrier composition film containing a barrier composition may be disposed on the barrier film. Examples of the barrier composition include a barrier composition containing at least one of polyvinyl alcohol resin and EVOH.

The gas barrier film may be a single layer, or may be a multilayer body in which layers made of the same material or layers made of different materials are laminated. In the case where the gas barrier film is a laminate having the resin substrate and the barrier film described above, the barrier film may be a single layer, and two or more layers of barrier films having the same composition or barrier films having different compositions are laminated. may

The thickness of the barrier film is preferably in the range of, for example, 2 μm to 50 μm. If the thickness of the barrier film is less than the above range, the gas barrier film tends to have pinholes or the like. It may lead to a decrease in barrier properties.

A gas barrier film is a film having gas barrier properties such as water vapor or oxygen. As for the barrier performance, it is preferable that the oxygen permeability is 0.1 cc/(m<2>*day*atm) or less. Also, the water vapor permeability is preferably 0.1 g/(m2·day) or less. When the oxygen and water vapor permeability of the gas barrier film are within the above ranges, it is possible to make it difficult for moisture, gas, etc., which permeate from the outside, to permeate the contents of the package.
(Heat-sealable film)
The heat-sealable film in the present disclosure is a film that is arranged closest to the inner film among the outer films and that can be bonded at least partially to the inner film. The heat-sealable film may be a single layer, or a multi-layer body in which layers made of the same material or layers made of different materials are laminated.

Materials constituting the heat-sealable film include polyethylene such as LLDPE and LDPE, polyolefin resin such as CPP, polyvinyl acetate resin, polyvinyl chloride resin, and poly (meth). Resins, such as an acrylic resin and a urethane resin, are mentioned.

In the present disclosure, among the above resins, polyethylene such as LLDPE and LDPE, polyolefin resin such as CPP, and the like are preferably used as materials for heat-sealable films.

If the heat-sealable film is a multi-layer body, it is preferably a multi-layer coextruded film. As the multilayer coextruded film, it is preferable to arrange an LDPE layer or LLDPE layer on one side or both sides of an EVOH layer, a Ny layer, a COC layer, a COP layer, or the like. Among them, a five-layer coextruded film of an LLDPE layer, a polyolefin resin layer, an EVOH layer, a polyolefin resin layer, and an LLDPE layer is particularly preferable. This is because the use of the EVOH layer in the multilayer coextruded film makes it possible to impart further gas barrier properties to the outer film, thereby further enhancing the gas barrier properties of the entire package.

(Other layers)
As other layers, a protective layer, a printing layer, and the like can be provided.

(protective layer)
The protective layer of the present disclosure can be placed on the outermost layer in the outer film opposite the inner film.

As the protective layer, when the outer film of the present disclosure is used to form a package, a layer having sufficient strength to protect the package and having excellent pinhole resistance, puncture resistance, etc. is used. is preferred. As a material constituting the protective layer, resins such as polyester films such as polyethylene terephthalate (PET) and polybutylene terephthalate (PBT) and polyamide films such as Ny can be used.

(Print layer)
The printed layer is a layer on which desired printing such as letters, numerals, patterns, patterns, etc. is carried out for the purpose of decoration, display of contents, etc., display, and aesthetics. The printed layer can be provided as necessary, for example, it can be provided on the outermost layer of the outer film on the side opposite to the inner film, between the gas barrier film and the protective layer. The printed layer can be formed using known pigments and dyes, and the formation method is not particularly limited. However, when imparting light-shielding properties to the package, it preferably contains a black pigment.
3. Adhesive Layer In the package of the present disclosure, each layer constituting the package may be laminated in direct contact, or may be laminated via an interlayer adhesive. As the interlayer adhesive, an adhesive generally used for packaging can be used.

Examples of adhesives include one-component or two-component curing or non-curing vinyl, (meth)acrylic, polyamide, polyester, polyether, polyurethane, epoxy, rubber, and others. Solvent-type, water-based, emulsion-type, etc. adhesives can be used.

4. Pouch The package of the present disclosure can be used as a pouch by filling it with a liquid.

A package used as a pouch can be formed, for example, by stacking an inner film and an outer film to form a multiple film, and stacking two multiple films. Specifically, the formation can be performed by facing the multiple films so that the inner film is on the liquid side when filled with the liquid, and joining the edges of the facing multiple films. As a method for direct bonding, it is sufficient that the bonding is not performed via an adhesive, and is preferably performed by heat welding, but is not limited thereto.

The shape of the pouch can be arbitrary. For example, as shown in FIG. 5, flat pouch (a), gusset pouch (b), stand pouch (c) and the like can be used.

The edge portions may be joined by heat welding, for example. For joining, for example, two multiplexed films may be superimposed and four sides may be thermally welded, or one folded multiplexed film may be superimposed and three sides may be thermally welded. Note that the corners of the thermally welded portion may be formed in an arc shape. As a result, the structure is such that the fluid content is less likely to remain at the corners.

5. Liquid The liquid is used to fill the packaging body, and is not particularly limited. Many of these liquid components contain an organic solvent, and the organic solvent itself or degassing generated from the organic solvent easily permeates the package. Therefore, by using the packaging body of the present disclosure, it is possible to prevent permeation of the organic solvent and generated degassing into the packaging body, and to effectively suppress delamination of the pouch.

EXAMPLES The present disclosure will be described more specifically below with reference to examples and comparative examples. "/" in the layer structure of the outer films of the packages of Examples and Comparative Examples indicates a lamination interface using an adhesive layer. Also, for example, a notation such as "A/B/C" indicates that layers are laminated in the order of A, B, and C from the outside of the package to the inner bag side via an adhesive layer.

The members constituting the packages of Examples and Comparative Examples are shown below. Adhesives used in Examples and Comparative Examples are shown below.

(Element)
・ Linear short-chain branched polyethylene (LLDPE) film 80: L535 (thickness 80 μm) manufactured by Aicello Co., Ltd.
・ Linear short-chain branched polyethylene (LLDPE) film 100: L4102 (thickness 100 μm) manufactured by Toyobo Co., Ltd.
・ Aluminum foil: IN30 (thickness 7 μm) manufactured by Toyo Aluminum Co., Ltd.
・ Polyethylene terephthalate (PET) film: E5012 (thickness 12 μm) manufactured by Toyobo Co., Ltd.
・ Biaxially stretched nylon (ONy) film: Bonyl W (thickness 25 μm) manufactured by Kojin Co., Ltd.
・Multilayer coextruded film (LLDPE/ethylene vinyl alcohol copolymer (EVOH)/LLDPE): BR801 (thickness 100 µm, manufactured by Aicello)
Adhesive (two-liquid curable polyurethane system): RU004 (main agent), H1 (curing agent) manufactured by Rock Paint Co., Ltd.
[Example 1]
(inner film)
An LLDPE80 film was used as the inner film.
(outer film)
An outer film was prepared having a layer configuration of PET film/aluminum foil/ONy film/multilayer coextruded film. At this time, an aluminum foil was used as a gas barrier film, and a multilayer coextruded film was used as a heat-sealable film. The "/" was laminated by a dry lamination method so that the adhesive was applied in an amount of 3 g/m ² .

Next, a package was produced. First, two pieces each of the obtained inner film and outer film were cut out to a size of 10 cm×20 cm and prepared. With the heat-sealable film of the outer film facing the inner film side, the outer film, the inner film, the inner film, and the outer film are laminated in this order, and the edge portion excluding the spout is held at a width of 10 mm at 190 ° C for 1 second. By heat-sealing under the conditions of , a package of Example 1 having a spout was obtained.
[Comparative Example 1]
In Comparative Example 1, a package was produced using only the outer film without using the inner film.
(outer film)
An outer film was prepared having a layer configuration of PET film/aluminum foil/ONy film/LLDPE100. At this time, an aluminum foil was used as a gas barrier film, and LLDPE100 was used as a heat-sealable film. The "/" was laminated by a dry lamination method so that the adhesive was applied in an amount of 3 g/m ² .

Next, two sheets of the obtained outer film were cut into pieces each having a size of 10 cm×20 cm. A package of Comparative Example 1 having a spout was obtained by laminating so that the heat-sealable films of the outer films faced each other and heat-sealing the edge portion excluding the spout. The heat sealing conditions were the same as in Example 1.
[Comparative Example 2]
A package of Comparative Example 2 was obtained in the same manner as in Comparative Example 1, except that an LLDPE100 film was used as the heat-sealable film.

<Pouch containing diethylene glycol diethyl ether (DEDE)>
Five packages were prepared for each of Example 1 and Comparative Examples 1 and 2. These packages were filled with DEDE (manufactured by Tokyo Kasei Kogyo Co., Ltd.), which is used as a main agent of an inkjet solvent, as a content. Next, the outlet was closed by heat-sealing the vicinity of the outlet to obtain a pouch containing the contents. Furthermore, these pouches were subjected to a laminate strength measurement test, a seal strength measurement test, and a contents leakage test by the following methods.

<Pouch containing amine curing agent>
Five packages were prepared for each of Example 1 and Comparative Examples 1 and 2. These packages were filled with an adhesive amine curing agent as a content. A 6:3:1 mixture of triethylenetetramine, m-xylylenediamine and polypropylene glycol diamine was used as the amine curing agent. Next, the outlet was closed by heat-sealing the vicinity of the outlet to obtain a pouch containing the contents. These pouches were subjected to a laminate strength measurement test and a seal strength measurement test by the following methods.

<Laminate strength measurement test>
A lamination strength measurement test was performed on the prepared packages of Example 1 and Comparative Examples 1 and 2. Five pouches containing DEDE and five pouches containing an amine-based curing agent were stored in a constant temperature bath set at a storage temperature of 60°C for one month. With respect to the pouch after storage, the lamination strength of the lamination portion of the ONy outer film and the heat-sealable film was measured. Specifically, a rectangular sample with a long side of 50 mm and a short side of 15 mm was cut out from the edge of the package after storage. The laminate portion of these samples was peeled off by 15 mm in the long side direction.

A Tensilon Universal Material Tester RTC-1310 (manufactured by A&D) was used as a measuring instrument for measuring the laminate strength. Each part of the laminate that had already been peeled off was chucked with a gripper of a measuring device. In addition, each of the grippers was pulled away from each other in a direction orthogonal to the plane direction of the still-bonded laminate at a rate of 300 mm/min, and the average tensile stress in the stable region (see FIG. 6) values were measured.

The chuck-to-chuck distance S1 between the grippers was set to 30 mm at the start of pulling and 60 mm at the end of pulling. FIG. 6 is a diagram showing changes in tensile stress with respect to the chuck-to-chuck distance S1. As shown in FIG. 6, the change in tensile stress with respect to the chuck-to-chuck distance S1 passes through the first region and enters the second region, which is a stable region with a smaller rate of change than the first region.

The average value of the tensile stress in the stable region was measured for five test pieces, and this was taken as the lamination strength of the lamination portion. The environment during the measurement was a temperature of 23° C. and a relative humidity of 50%.
<Seal strength measurement test>
A sealing strength measurement test was performed on the prepared packages of Example 1 and Comparative Examples 1 and 2. Five pouches containing DEDE and five pouches containing an amine-based curing agent were stored in a constant temperature bath set at a storage temperature of 60°C for one month. With respect to the pouches after storage, the lamination strength of the second welded portions where the inner films were joined together was measured. Specifically, a rectangular sample with a long side of 50 mm and a short side of 15 mm was cut out from the edge of the package after storage. The second welded portion of these samples was peeled off by 15 mm in the long side direction.

A Tensilon Universal Material Tester RTC-1310 (manufactured by A&D) was used as a measuring instrument for measuring the seal strength. Each of the already peeled portions of the second welded portion was chucked with the gripper of the measuring device. In addition, the grips were pulled at a rate of 300 mm/min in the direction orthogonal to the plane direction of the second welded part still joined, and the average value of the tensile stress in the stable region was measured. did.

The chuck-to-chuck distance S1 between the grippers was set to 30 mm at the start of pulling and 60 mm at the end of pulling.

The average value of the tensile stress in the stable region was measured for five test pieces and taken as the seal strength of the second welded portion. The environment during the measurement was a temperature of 23° C. and a relative humidity of 50%.

<Content leakage inspection>
Five pouches in which DEDE was enclosed in the packages of Example 1 and Comparative Examples 1 and 2 were inspected for contents leakage. The pouch was stored for one month in a constant temperature bath set at a storage temperature of 60° C., and then stored at room temperature for another day, and the presence or absence of leakage of the contents out of the packaging bag was confirmed.

Table 1 summarizes the results of the lamination strength measurement test, the seal strength measurement test, and the content leakage test for the pouches containing DEDE.

評価基準
＜外観＞
〇：５個の包装体において、全部が良好であった。
×：５個のうち、一部または全部に浮きが発生していた。
＜溶出試験＞
〇：５個の包装体のうち、全部おいて、内容物が漏出していなかった。
×：５個の包装体のうち、一部または全部において、内容物の漏出が確認された。

Evaluation Criteria <Appearance>
Good: All of the 5 packages were good.
x: Some or all of the 5 pieces had floating.
<Elution test>
◯: Contents did not leak from all of the 5 packages.
×: Leakage of contents was confirmed in some or all of the 5 packages.

Compared to the pouch of Comparative Example 1, the pouch of Example 1 exhibited a lower rate of decrease in laminate strength in the outer film after storage. In addition, the pouch of Example 1 had a lower rate of decrease in seal strength at the second welded portion than the pouches of Comparative Examples 1 and 2. Leakage of the contents was confirmed from the pouch after storage of Comparative Example 2, but no leakage of the contents was confirmed from the package of Example 1.

Table 2 summarizes the results of the lamination strength measurement test and seal strength measurement test for the pouches containing the amine-based curing agent.

評価基準
＜外観＞
〇：５個の包装体において、全部が良好であった。
×：５個のうち、一部または全部に浮きが発生していた。

Evaluation Criteria <Appearance>
Good: All of the 5 packages were good.
x: Some or all of the 5 pieces had floating.

Compared to the pouches of Comparative Examples 1 and 2, the pouch of Example 1 exhibited a lower rate of decrease in laminate strength in the outer film after storage and a lower rate of decrease in sealing strength of the second welded portion. Also, the pouches of Comparative Examples 1 and 2 floated after storage. It was presumed that it was caused by falling off. On the other hand, the pouch of Example 1 had a good appearance even after storage.

Among the above comparative examples, the decrease in the lamination strength of the outer film after storage is considered to be due to the permeation of the filled liquid component into the outer film. In addition, the decrease in the seal strength of the outer film after storage is considered to be due to the permeation of the filled liquid component into the outer film, which causes a decrease in lamination strength and floatation, making the outer film itself brittle. Since the outer film itself is brittle, when the seal strength is measured, the seal strength is detected while further delamination of the outer film occurs. For this reason, the seal strength value is presumed to have decreased from the initial value.

(summary)
As described above, according to the present embodiment, it is possible to suppress the deterioration of the lamination strength of the outer film, the deterioration of the sealing strength of the second welded portion, and the leakage from the package. Moreover, according to the embodiment of the present disclosure, it is possible to suppress floating of the pouch after being filled with contents, and to maintain a good appearance.

1 package 2 multi-layered film 3 edge 4 spout 10 joint 20 inner film 21 outer film 30 inner bag 31 outer bag 41 heat-sealable film 42 adhesive layer 43 gas barrier film 44 protective layer 50 first joint 51 second junction

Claims (6)

A package for filling a liquid,
Having an inner bag containing an inner film and an outer bag containing an outer film positioned relatively outside the inner bag,
Both main surfaces of the inner film are heat-sealable,
The outer film has a gas barrier film and a heat-sealable film,
The outer film, the inner film, the inner film, and the outer film are directly joined in this order on at least part of the peripheral edge of the package,
a first welded portion where the inner film and the heat-sealable film of the outer film are joined, and a second welded portion where the inner films are joined together,
The package, wherein the length from the edge of the first welded portion is longer than the length from the edge of the second welded portion. The outer film has the gas barrier film, the adhesive layer, and the heat-sealable film from the outside of the package toward the inner bag,
The adhesive layer closest to the heat-sealable film in the thickness direction of the outer film is closer to the heat-sealable film than the gas barrier film closest to the heat-sealable film. The package according to claim 1 . The package according to any one of claims 1 and 2 , wherein said inner film is a polyethylene film. The package according to any one of claims 1 to 3 , wherein the gas barrier film is a film having a gas barrier film on at least one surface of a metal foil or a resin substrate. Claim 1, wherein the package is any one of a flat pouch, a gusseted pouch, and a stand pouch.
5. The package according to any one of items 1 to 4. A pouch comprising the package according to any one of claims 1 to 5 , and an inkjet ink or adhesive filled in the package.