JP2020117233A - Package - Google Patents

Abstract

To provide a package for filling liquid therein, having an inner bag including an inner film and an outer bag including an outer film positioned outside the inner bag, both main faces of the inner film being heat-weldable, the outer film having a second heat-weldable film, with the outer film, the inner film, the inner film, and the outer film being directly bonded in this order, at least at a part of the side edges of a multiple packaging body.SOLUTION: In a package, an outer film 21 has a gas barrier film, an adhesion layer and a heat-weldable film from the outside of a package body 1 toward an inner bag 30. The adhesion layer at the nearest position from the heat-weldable film in the thickness direction of the outer film is present at the heat-weldable film side from the gas barrier film present at the nearest position from the heat-weldable film.SELECTED DRAWING: Figure 1

Description

The present invention relates to a package for filling with a liquid.

In recent years, packages for filling liquids such as ink, adhesives, and curing agents are known. For example, Patent Document 1 describes, as a laminate used for such a package, one using an aluminum foil in order to secure a water vapor barrier property and a light shielding property.

Japanese Patent No. 5918462

Depending on the package, when a liquid such as an ink, an adhesive or a curing agent is filled, the components contained in the liquid may permeate into the package and the lamination strength between the layers of the package may be reduced. Further, when the component contained in the liquid permeates, the seal strength of the package may be reduced when the package has a heat-welded portion.

The present disclosure has been made in view of the above, and suppresses a decrease in laminate strength between each layer of a package, and when the package has a heat-welded portion, suppresses a decrease in seal strength. By doing so, the main purpose is to provide a good package.

The present disclosure is a package for filling with a liquid, and has an inner bag including an inner film, and an outer bag including an outer film positioned relatively outside the inner bag, and the inner film is , Both main surfaces are heat-weldable, the outer film has a film that can be heat-welded with a gas barrier film, the outer film, the inner film, at least a portion of the peripheral portion of the package. Provided is a package in which the inner film and the outer film are directly bonded 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-weldable film from the outer side of the package toward the inner bag side. It is preferable that the adhesive layer closest to the heat-weldable film in the thickness direction is closer to the heat-weldable film than the gas barrier film closest to the heat-weldable film.

Moreover, in the said package of this indication, the 1st welding part by which the said 1st inner film and the said heat-weldable film of the said outer film were joined, and the 2nd welding part by which the said inner films were joined. It is preferable that the length of the first welded portion from the peripheral portion is longer than the length of the second welded portion from the peripheral portion.

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

In the package of the present disclosure, it is preferable that the gas barrier film is a film having a gas barrier film on at least one surface of the metal foil or the resin base material.

Further, it is preferable that the package disclosed above is any one of a flat pouch, a gusset pouch, and a stand pouch.

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

According to the present disclosure, in a package when a liquid is filled, a decrease in the laminate film strength between each layer of the outer film is suppressed, and when the package has a site that is heat-welded, the seal strength is decreased. Suppress.

It is a schematic plan view which shows an example of the package of this indication. It is a schematic sectional drawing which shows an example of the package of this indication. It is a schematic sectional drawing which shows the other example of the package of this indication. It is a schematic sectional drawing which shows an example of the multiple film in this indication. It is explanatory drawing which shows the example of the shape of the package of this indication. It is a figure which shows the change of the tensile stress with respect to the distance S1 between chucks.

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

In the package of the present specification, the side filled with the liquid may be described as "inside", and the side opposite to the inner film with respect to the outer film may be described as "outer side". Although the expression “directly bond” is used in some cases, “directly bond” means a state in which the surfaces to be bonded are bonded together without an adhesive.

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

The package of the present disclosure is for filling with a liquid, and has an inner bag including an inner film, and an outer bag including an outer film positioned relatively outside the inner bag, Both main surfaces of the inner film can be heat-welded, and the outer film has a film that can be heat-welded with the gas barrier film. In addition, at least a part of the peripheral portion of the package is formed by directly bonding the outer film, the inner film, the inner film, and the outer film in this order.

The 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 a liquid, and has a spout 4, an inner bag 30, and an outer bag 31. Further, the package 1 has a double bag structure in which an inner bag 30 and an outer bag 31 overlap each other.

The package 1 illustrated in FIG. 1 is formed by facing two multi-layered films 2 each having an inner film 20 and an outer film 21 overlapped with each other, and heat-sealing a peripheral portion 3 excluding a spout 4. .. The peripheral 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 when the liquid component has penetrated into the inner bag, 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 strength of the laminated film between the layers of the outer film.

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

In the packaging body of the present embodiment, the contact portion between the liquid component and the second joint portion when the liquid is filled is made as small as possible by providing the joint portion at the peripheral portion, and the second joint portion is sealed by the liquid component. The reduction in strength can be suppressed.

The reason why the sealing strength of the second joint is reduced by the liquid component is not clear, but when the inner films are joined by heat welding, the applied heat causes the crystallinity of the resin forming the second joint to be increased. It is considered that the entanglement of molecular chains is reduced. Therefore, the second joint portion is more likely to contain the liquid component than the portion of the inner film which is not heat-welded, and the resin of the second joint portion is swollen by the contained liquid component. It is presumed that the sealing strength of the joint will decrease. From this, when the package has a heat-welded portion, the joint strength is provided at the peripheral portion, so that the decrease in the seal strength can be suppressed.

In the present disclosure, as shown in FIG. 3, the length of the first joint portion 50 (broken line 1) from the edge portion is longer than the length of the second joint portion 51 (broken line 2) from the edge portion. It is more preferable to form. By making the second joint portion 51 longer than the first joint portion 50 from the edge portion 3, when the packaging body 1 filled with the liquid is opened, the cutting at the BB′ portion is prevented. It will be possible. By cutting at the BB' portion, the number of cuts is reduced to two compared to the cutting at the CC' portion shown in FIG. 2, so that the opening becomes easier and the liquid is taken out after the opening. Because it will be easier.

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

Further, in the outer film 21 in FIG. 4, the adhesive layer 42 located closest to the heat-weldable film 41 is a heat-weldable film rather than the gas barrier film 43 located closest to the heat-weldable film 41. It is arranged on the 41st side.

In a general package without an inner film, when the adhesive layer is arranged inside the gas barrier film, the filled liquid component penetrates into the package and melts the adhesive layer, resulting in a laminate. A decrease 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 laminate strength between the layers of the package even when the adhesive layer is arranged inside the gas barrier film. In the case where the package has a heat-welded portion, it is possible to suppress a decrease in seal strength, and as a result, it is possible to obtain a good package.

Hereinafter, the configuration of the package will be described in detail.
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 located relatively outside 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 filling the liquid.

The inner film may be made of a material whose both main surfaces can be heat-welded. The inner film is preferably made of a thermoplastic resin, as long as both main surfaces thereof are melted by heating and can be joined to each other or to the outer film. The inner film may be a single layer or a multilayer body in which layers made of the same material or layers made of different materials are laminated.

When the inner film is composed of a single layer, for example, polyethylene such as linear short-chain branched polyethylene (LLDPE) and low density polyethylene (LDPE), and polyolefin such as unstretched polypropylene (CPP) are used. Examples thereof include resins, polyvinyl acetate-based resins, polyvinyl chloride-based resins, poly(meth)acrylic-based resins, urethane resins and the like.

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 the material of the film capable of being heat welded.

When the inner film is a multilayer, it is preferably a multilayer coextruded film. Examples of the multilayer coextrusion film include an ethylene vinyl alcohol copolymer (EVOH) layer, a nylon (Ny) layer, a cycloolefin copolymer (COC) layer, a cycloolefin polymer (COP) layer, and the like. The arrangement of layers is preferred. Among them, a 5-layer coextruded film of LLDPE layer, polyolefin resin layer, EVOH layer, polyolefin resin layer, and 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 and further enhance 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 in the liquid, or a film which hardly dissolves in the liquid. Therefore, it is preferable that the layer that comes into 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 being dissolved in the filled liquid.

Examples of the additive-free resin include additive-free polyethylene, additive-free polypropylene, additive-free polyisobutylene, and other additive-free polyolefins. In particular, additive-free polyethylene can be preferably used because it is excellent in flexibility and flexibility. The term "non-added" is used to mean that it does not include various additives that are generally contained in polyolefin films. Examples of such additives include an antioxidant, a slip agent, and an antiblocking agent, which preferably act during the production of a film.

The melting point of the resin forming the inner film is, for example, preferably in the range of 70° C. or higher and 150° C. or lower, and particularly preferably in the range of 95° C. or higher and 130° C. or lower. By setting the melting point of the resin forming the inner film within the above range, peeling of the joint between the outer film and the inner film and the joint between the inner films can be suppressed under the environment in which the package is used. In addition, when the melting point of the resin forming the inner film greatly exceeds the above range, it is necessary to heat-weld at a high temperature, and the resin or the like used for the package may deteriorate due to heat. is there.
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 the discharge suitability when the contents are filled.
3. Outer bag, outer film The outer bag in the present disclosure is an outer film formed into a bag shape. The outer film is arranged relatively outside with respect to the inner film, and has a gas barrier film and a heat-weldable film. The outer film may have other layers in addition to the gas barrier film and the heat-weldable film.
(Gas barrier film)
As the gas barrier film in the present disclosure, for example, a metal foil, a resin base material, and a film having a barrier film containing an inorganic substance disposed on at least one surface side of the resin base material, which is generally used as a gas barrier layer, should be used. Can also By using such a gas barrier film, it is possible to prevent leakage of the contents or gas generated from the contents and to prevent inflow of water vapor, oxygen, or the like from the outside of the package.
Examples of the metal foil include metal foils such as aluminum, nickel, stainless steel, iron, copper, and titanium.

Examples of the inorganic material forming 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 is preferably a vapor deposition film. The resin base material of the film having the barrier film is not particularly limited, and a known resin base material such as a PET film can be used.

The film having a barrier film may be one in which a barrier composition film containing a barrier composition is further 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 a multilayer body in which layers made of the same material or layers made of different materials are laminated. When the gas barrier film is a laminate having the resin base material and the barrier film described above, the barrier film may be a single layer, and two or more barrier films having the same composition or different barrier films are laminated. May be.

The thickness of the barrier film is preferably in the range of 2 μm to 50 μm, for example. If the thickness of the barrier film is smaller than the above range, pinholes and the like are likely to occur in the gas barrier film, and if the thickness of the gas barrier film is greater than the above range, cracks and the like are likely to occur at the bent portion when bent, There is a risk that the barrier property will be reduced.

The gas barrier film is a film having a barrier property against gas such as water vapor or oxygen. As the barrier performance, the oxygen permeability is preferably 0.1 cc/(m2·day·atm) or less. Further, the water vapor permeability is preferably 0.1 g/(m 2 ·day) or less. When the oxygen and water vapor permeability of the gas barrier film is within the above range, it is possible to make it difficult for moisture, gas and the like that have permeated from the outside to permeate into the contents of the package.
(Film that can be heat welded)
The heat-weldable film in the present disclosure is a film that is arranged on the innermost film side among the outer films and can be joined to the inner film at least in part. The heat-weldable 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 a material constituting the heat-weldable film, when it is a single layer, polyethylene resin such as LLDPE and LDPE, polyolefin resin such as CPP, polyvinyl acetate resin, polyvinyl chloride resin, poly(meth) Examples of the resin include acrylic resin and urethane resin.

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 the material of the film capable of being heat-welded.

When the heat-sealable film is a multi-layer body, it is preferably a multi-layer coextrusion film. As the multilayer coextruded film, one having an LDPE layer or an LLDPE layer disposed on one side or both sides of an EVOH layer, a Ny layer, a COC layer, a COP layer, or the like is preferable. Among them, a 5-layer coextruded film of LLDPE layer, polyolefin resin layer, EVOH layer, polyolefin resin layer, and LLDPE layer is particularly preferable. By using the EVOH layer in the multilayer coextruded film, the outer film can be provided with a further gas barrier property, and the gas barrier property of the entire package can be further enhanced.

(Other layers)
As other layers, a protective layer, a printing layer, etc. can be provided.

(Protective layer)
The protective layer of the present disclosure can be disposed on the outermost layer in the outer film, opposite to the inner film.

As the protective layer, when a package is formed using the outer film of the present disclosure, a layer having sufficient strength to protect the package and having excellent pinhole resistance, puncture resistance and the like are used. It is preferable. As a material forming the protective layer, for example, a resin such as a polyester film such as polyethylene terephthalate (PET) or polybutylene terephthalate (PBT) or a polyamide film such as Ny can be used.

(Print layer)
The print layer is a layer on which desired printing of characters, numbers, pictures, patterns and the like is performed in order to give decoration, display of contents, etc., and display and aesthetics. The printing layer can be provided as necessary, and can be provided, for example, between the gas barrier film and the protective layer and on the outermost layer of the outer film opposite to the inner film. The printing layer can be formed using a known pigment or dye, and the forming method thereof is not particularly limited, but it is preferable that the printing layer contains a black pigment when the package is provided with a light shielding property.
3. Adhesive Layer In the package of the present disclosure, the layers constituting the package may be laminated in direct contact with each other, or may be laminated via an interlayer adhesive. As the interlayer adhesive, an adhesive generally used for a package can be used.

As the adhesive, for example, one-component or two-component curing or non-curing vinyl type, (meth)acrylic type, polyamide type, polyester type, polyether type, polyurethane type, epoxy type, rubber type, etc. The solvent-type, water-type, emulsion-type and other adhesives can be used.

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

The package used as a pouch can be formed by, for example, 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 causing the multiple films to face each other so that the inner film is on the liquid side when the liquid is filled, and joining the facing edges of the multiple films. As a method of directly bonding, it is sufficient if it does not involve an adhesive, and it is preferable to perform the heat welding, but the method is not limited thereto.

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

The edge portions may be joined by, for example, heat welding. For joining, for example, two multi-layered films may be superposed and heat-welded on four sides, or one folded multi-layered film may be superposed and heat-welded on three sides. The corners of the heat-welded portion may be formed in an arc shape. As a result, the structure is such that the fluid contents are less likely to remain in the corners.

5. Liquid The liquid is to be filled in the package and is not particularly limited. For example, ink for inkjet or the like, an adhesive, or the like can be preferably used. Many of these liquid components include an organic solvent, and the organic solvent itself or degassing generated from the organic solvent easily penetrates into the package. Therefore, by using the package of the present disclosure, it is possible to prevent the penetration of the organic solvent and the generated degas into the package, and effectively suppress the delamination of the pouch and the like.

Hereinafter, the present disclosure will be described more specifically with reference to Examples and Comparative Examples. In addition, "/" in the layer structure in the outer films of the packaging bodies of the examples and the comparative examples indicates a laminating interface using the adhesive layer. Further, for example, a notation such as “A/B/C” indicates that the layers are laminated in the order of A, B, and C from the outer side of the package toward the inner bag side via the adhesive layer.

The members constituting the packages of Examples and Comparative Examples are shown below. The 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
-Linear short chain branched polyethylene (LLDPE) film 100: Toyobo Co., Ltd., L4102 (thickness 100 μm)
・Aluminum foil: Toyo Aluminum Co., IN30 (thickness 7 μm)
-Polyethylene terephthalate (PET) film: manufactured by Toyobo Co., Ltd., E5012 (thickness 12 μm)
Biaxially stretched nylon (ONy) film: Bonito W (thickness 25 μm) manufactured by Kojinsha
-Multilayer coextrusion film (LLDPE/ethylene vinyl alcohol copolymer (EVOH)/LLDPE): BR801 (thickness 100 μm, manufactured by Aicello Co., Ltd.)
Adhesive (two-component curing type polyurethane): 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 having a layer structure of PET film/aluminum foil/ONy film/multi-layer coextruded film was prepared. At this time, an aluminum foil was used as a gas barrier film, and a multilayer coextrusion film was used as a heat-weldable film. The above “/” was obtained by laminating the adhesive by a dry laminating method so that the coating amount was 3 g/m ² .

Next, a package was prepared. First, two pieces of the obtained inner film and two pieces of the outer film were cut out in a size of 10 cm×20 cm. With the outer film heat-weldable 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 10 mm wide, 190° C., 1 second. The package of Example 1 having a spout was obtained by heat-sealing under the conditions.
[Comparative Example 1]
In Comparative Example 1, the inner film was not used and only the outer film was used to produce a package.
(Outer film)
An outer film having a layer structure of PET film/aluminum foil/ONy film/LLDPE100 was prepared. At this time, aluminum foil was used as a gas barrier film and LLDPE100 was used as a heat-weldable film. The above "/" was formed by dry laminating the adhesive so that the coating amount was 3 g/m ² .

Next, two pieces of the obtained outer film were cut out in a size of 10 cm×20 cm to prepare. The outer films were laminated so that the heat-weldable films were opposed to each other, and the edges except the spout were heat-sealed to obtain a package of Comparative Example 1 having a spout. The heat sealing conditions were the same as in Example 1.
[Comparative example 2]
A packaging body of Comparative Example 2 was obtained in the same manner as Comparative Example 1 except that LLDPE100 film was used as the heat-weldable film.

<Pouch in which diethylene glycol diethyl ether (DEDE) is enclosed>
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 the main component of the inkjet solvent as the content. Next, the vicinity of the spout was heat-sealed to close the spout and obtain a pouch in which the contents were enclosed. Further, these pouches were subjected to a laminate strength measurement test, a seal strength measurement test, and a content leakage inspection by the following methods.

<Pouch in which amine curing agent is enclosed>
Five packages were prepared for each of Example 1 and Comparative Examples 1 and 2. These packages were filled with an amine curing agent as an adhesive as contents. As the amine curing agent, a mixture of triethylenetetramine, m-xylylenediamine, and polypropylene glycol diamine in a ratio of 6:3:1 was used. Next, the vicinity of the spout was heat-sealed to close the spout and obtain a pouch in which the contents were enclosed. 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 laminate strength measurement test was conducted on the produced packaging bodies of Example 1 and Comparative Examples 1 and 2. Five pouches each enclosing DEDE and five pouches enclosing an amine-based curing agent were stored for one month in a constant temperature bath set at a storage temperature of 60°C. With respect to the pouch after storage, the laminate strength of the laminated portion of the outer film ONy and the heat-weldable film was measured. Specifically, a rectangular sample having a long side of 50 mm and a short side of 15 mm was cut out from the peripheral portion of the package after storage. The laminated portion of these samples was peeled by 15 mm in the long side direction.

A tensilon universal material testing machine RTC-1310 (manufactured by A&D Co.) was used as a measuring instrument for laminate strength measurement. Each of the already peeled portions of the laminated portion was chucked by the grip of the measuring instrument. In addition, the grips were respectively pulled at a speed of 300 mm/min in a direction away from each other in a direction orthogonal to the plane direction of the laminated portion still joined, and the average of the tensile stress in the stable region (see FIG. 6) was obtained. The value was measured.

The chuck-to-chuck distance S1 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 distance S1. As shown in FIG. 6, the change in the 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 having a smaller rate of change than the first region.

The average value of the tensile stress in the stable region was measured for the five test pieces and used as the laminate strength of the laminated portion. The environment at the time of measurement was a temperature of 23° C. and a relative humidity of 50%.
<Seal strength measurement test>
A seal strength measurement test was conducted on the produced packaging bodies of Example 1 and Comparative Examples 1 and 2. Five pouches each enclosing DEDE and five pouches enclosing an amine-based curing agent were stored for one month in a constant temperature bath set at a storage temperature of 60°C. With respect to the stored pouch, the laminating strength of the second welded portion where the inner films were joined together was measured. Specifically, a rectangular sample having a long side of 50 mm and a short side of 15 mm was cut out from the peripheral portion of the stored package. The second welded portions of these samples were separated by 15 mm in the long side direction.

As a measuring instrument for measuring the seal strength, a tensilon universal material testing machine RTC-1310 (manufactured by A&D) was used. The already peeled portions of the second welded portion were each chucked by the grip of the measuring instrument. In addition, the grips are respectively pulled at a speed of 300 mm/min in the directions away from each other in the direction orthogonal to the surface direction of the second welded portion that is still joined, and the average value of the tensile stress in the stable region is measured. did.

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

With respect to the five test pieces, the average value of the tensile stress in the stable region was measured and used as the seal strength of the second welded portion. The environment at the time of measurement was a temperature of 23° C. and a relative humidity of 50%.

<Content leakage inspection>
A content leakage inspection was performed on five pouches in which DEDE was sealed in the produced packaging bodies of Example 1 and Comparative Examples 1 and 2. The pouch stored for one month in a thermostat set at a storage temperature of 60° C. was further stored at room temperature for one day, and it was confirmed whether the contents leaked out of the packaging bag.

Table 1 summarizes the results of the laminate strength measurement test, the seal strength measurement test, and the content leakage test in the pouch in which DEDE was enclosed.

Evaluation criteria <Appearance>
Good: All of the 5 packages were good.
Poor: Some or all of the five pieces had floating.
<Dissolution test>
◯: In all of the 5 packages, the contents did not leak.
X: Leakage of the contents was confirmed in a part or all of the 5 packages.

The pouch of Example 1 had a lower decrease rate of the laminate strength in the outer film after storage, as compared with the pouch of Comparative Example 1. In addition, the pouch of Example 1 had a lower reduction rate of the seal strength of the second welded portion than the pouches of Comparative Examples 1 and 2. Although leakage of the contents was confirmed from the pouch after storage of Comparative Example 2, leakage of the contents was not confirmed from the package of Example 1.

Table 2 shows a summary of the results of the laminate strength measurement test and the seal strength measurement test for the pouch in which the amine-based curing agent is enclosed.

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

The pouch of Example 1 had a lower reduction rate of the laminate strength in the outer film after storage and a lower reduction rate of the seal strength of the second welded portion than the pouches of Comparative Examples 1 and 2. Further, in the pouches of Comparative Examples 1 and 2, floating occurred after storage, but this was because the contents penetrated into the outer film and the adhesive did not work. It was speculated that this was due to the slippage. On the other hand, the pouch of Example 1 had a good appearance even after storage.

Among the comparative examples, the one in which the laminating strength of the outer film after storage was lowered is considered to be because the filled liquid component penetrated into the outer film. Further, the reason why the seal strength of the outer film after storage is lowered is considered to be that the filled liquid component permeated into the outer film, resulting in lowering of the laminating strength and floating, and the outer film itself became brittle. Since the outer film itself is fragile, when the seal strength is measured, the outer film undergoes further delamination and the seal strength is detected. Therefore, it is presumed that the seal strength value was lower than the initial value.

(Summary)
As described above, according to this embodiment, it is possible to suppress a decrease in the laminating strength of the outer film, a decrease in the sealing strength of the second welded portion, and a leakage from the package. Further, according to the embodiment of the present disclosure, it is possible to prevent the pouch from floating after being filled with the content, and to maintain a good appearance.

1 Package 2 Multiple Film 3 Edge 4 Spout 10 Join 20 Inner Film 21 Outer Film 30 Inner Bag 31 Outer Bag 41 Heat Weldable Film 42 Adhesive Layer 43 Gas Barrier Film 44 Protective Layer 50 First Join 51 Second joint

Claims (7)

A package for filling with a liquid,
An inner bag including an inner film, and the inner bag has an outer bag including an outer film positioned relatively outside,
The inner film has both main surfaces heat-weldable,
The outer film has a gas barrier film and a heat-weldable film,
A package in which the outer film, the inner film, the inner film, and the outer film are directly joined in this order on at least a part of a peripheral portion of the package. The outer film, from the outside of the package toward the inner bag side, has the gas barrier film, an adhesive layer, and the heat-weldable film,
In the thickness direction of the outer film, the adhesive layer at the closest position from the heat-weldable film, than the gas barrier film at the closest position from the heat-weldable film, is on the heat-weldable film side, The package according to claim 1. In the package,
A first welded portion in which the first inner film and the heat-weldable film of the outer film are joined together, and a second welded portion in which the inner films are joined together,
The package according to any one of claims 1 and 2, wherein the length of the first welded portion from the side edge portion is longer than the length of the second welded portion from the side edge portion. The package according to any one of claims 1 to 3, wherein the inner film is a polyethylene film. The package according to any one of claims 1 to 4, 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. The package according to any one of claims 1 to 5, wherein the package is a flat pouch, a gusset pouch, or a stand pouch. A pouch comprising the packaging body according to any one of claims 1 to 6, and an inkjet ink or an adhesive filled in the packaging body.