JPH08301298A - Packaging bag for bag-in box - Google Patents

Abstract

PURPOSE: To enhance concealability and light shielding properties and to make residual matter impossible to see through from the outside so as no to apply an unpleasant feeling. CONSTITUTION: A colored resin film 1 and other resin film 2 are superposed one upon another to constitute a multiple structure 3 and an opening part 4 is further formed to the multiple structure 3. Subsequently, a pouring port 6 having a flange part 5 is inserted in the opening part 4 from the inside and the superposed part of the flange part 5 of the pouring port 6 and the multiple structure 3 is heat-sealed to form a seal part 7 to attach the pouring port 6 to the multiple structure 3. Continuously, a multiple structure 3 constituted by superposing a separate colored resin film 1 and other resin film 2 one upon another is superposed on the multiple structure 3 having a pouring port 6 attached thereto and the outer peripheral end parts of both of them are heat- sealed to produce a packing bag A for a bag-in box having seal parts 9 provided to four peripheries thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging bag for bag-in-box, and more specifically, for filling and packaging liquid beverages such as juice, liquor, wine, food seasonings and the like. The present invention relates to a suitable packaging bag for bag-in-box.

[0002]

2. Description of the Related Art Conventionally, containers such as metal cans and bottles have been used as typical packaging containers for filling and packaging liquid beverages such as juice, alcohol and wine.
However, in recent years, pollution problems have been taken up in these containers worldwide, and as a part of these problems, empty cans, empty bottles and the like as one of the solid wastes have become a problem, and there is concern about their use. As an alternative container, a packaging bag for bag-in-box, which is a so-called one-way container that can be disposable, has been receiving attention. This is a so-called bag-in-box (ba) in which a corrugated ball box or the like is used as an exterior and a plastic thin-walled interior can or bag is used for the interior.
This is called a g in box). That is,
It is related to a composite container of paper and plastic, and water resistance, chemical resistance, gas barrier property, etc. for the contents are
The plastic inner thin can or bag, which is the interior, is responsible for the rigidity required for transportation and use.
It is to be shared among the boxes.

[0003]

By the way, as a packaging bag for a bag-in-box which is conventionally used as an inner bag in a bag-in-box, a laminate in which several layers of transparent resin films are laminated is usually used. in use. Since this product has transparency, the contents can be seen through from the outside, and in particular, after use, it is possible to see through the residue and the like adhering to the inner wall and cause an unpleasant sensation of being dirty. is there. For this reason, when manufacturing a packaging bag for bag-in-box, use a vapor deposition film obtained by vapor deposition of a metal such as aluminum or aluminum foil as the laminated material, and expect effects such as gas barrier properties as a packaging bag. At the same time, attempts have been made to obstruct the transparency of the contents by making them opaque. However, when using a vapor-deposited film obtained by vapor-depositing a metal such as aluminum, or an aluminum foil, in the packaging bag for bag-in-box, there is a drawback that cracks or the like occur during transportation, and in particular, aluminum foil In this case, there is a drawback that pinholes or the like are generated and the bag does not function as a packaging bag. Therefore, an object of the present invention is to have a concealing property, a light-shielding property, etc., without deteriorating the function as a packaging bag, and not being able to see through the contents, and in particular, causing discomfort after use. There is no wrapping bag for bag-in-box.

[0004]

Means for Solving the Problems As a result of earnest studies to solve the above problems, the present inventor has found that a colored resin film is used as a resin film forming a bag for a bag-in-box. Paying attention to the above, at least this colored resin film is used in combination with another film to form a multiplex body, and a packaging bag for bag-in-box is formed using this, and the packaging bag is composed of juice, liquor, wine, etc. When the contents of the above are filled and packaged, it is possible to prevent the see-through of the contents with a concealing property without deteriorating the function as a packaging bag, and in particular, without causing discomfort after use, Further, the present invention has been completed by finding a packaging bag for a bag-in-box which is excellent in light-shielding property and can prevent the deterioration of the contents.

That is, the present invention provides a bag-in-box packaging bag comprising a resin film, which is folded or overlapped, and the outer peripheral end portion of which is heat-sealed to form a bag, and which is further provided with an injection port. The present invention also relates to a packaging bag for a bag-in-box, wherein the resin film is a multiple body containing a colored resin film.

Further, in the present invention, the above-mentioned multiplex body is a film of a resin having a heat seal property, a film of a resin having strength and heat resistance, a film of a resin having a gas barrier property, and The present invention relates to a packaging bag for a bag-in-box, which comprises at least one film selected from a resin film having a water vapor barrier property and a colored resin film.

[0007]

The present invention focuses on a colored resin film as a resin film constituting a bag for a bag-in-box, and produces a multiplex body including at least this colored resin film. By using as a packaging bag for bag-in-box, the function of the packaging bag is not deteriorated, and due to the colored resin film, the hiding property, the light shielding property, etc. are excellent, and the contents can be seen through. It is possible to produce a packaging bag for a bag-in-box, which can be prevented and, in particular, does not cause discomfort after use and can prevent deterioration of the contents.

[0008]

Detailed Description of the Invention The present invention will be described in more detail. First, the materials constituting the packaging bag for bag-in-box according to the present invention will be described. First, in the above-mentioned present invention, as a colored resin film, a packaging bag for a bag-in-box is formed by using this, and when the contents are filled and packaged, it has concealing property, light-shielding property, etc. The resin film may be colored to such an extent that the contents cannot be seen through from the outside,
For example, low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-
Vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer, ethylene-acrylic acid copolymer, methylpentene resin, polyolefin resin such as polybutene resin, polyvinyl chloride resin, polyvinylidene chloride Resin, vinyl chloride-vinylidene chloride copolymer, poly (meth) acrylic resin, polyacrylonitrile resin, polystyrene resin, polyester resin,
Known polyamide-based resins, polycarbonate-based resins, polyvinyl alcohol, saponified ethylene-vinyl acetate copolymers, fluorine-based resins, gen-based resins, polyacetal-based resins, polyurethane-based resins, etc. A resin film or sheet which is colored with a coloring agent such as a dye or a pigment can be used.

In the present invention, any of the above-mentioned film or sheet may be used, such as unstretched film or uniaxially or biaxially stretched film. The thickness is arbitrary, but is from several 0.5 μm to 30 μm.
It can be used by selecting it from the range of about 0 μm.
Preferably, from the standpoint of film formation, packaging materials, and functional aspects of beet,
5 μm to 100 μm is desirable. Further, in the present invention, the film or sheet may be any film such as an extrusion film, an inflation film, a coating film, and a laminate film. The sheet may be composed of one or more layers.

In the above, various methods can be used for coloring the resin film, for example,
Dyes, colorants such as pigments are added to the resin pellets listed above, and other various additives are optionally added, mixed well, and then a film of the colored resin is formed by film formation. A method for producing, or a method for forming a colored film on the resin film mentioned above by a usual coating method or a printing method, and further, a dyeing method for a resin film mentioned above by a usual dyeing method or the like. Then, the dyeing layer can be formed by the method. In the present invention, the colored resin film may be colored in a color that makes it difficult to see through the contents, and it may be colored in any color, and it may have one or more layers. May consist of Specifically, in the present invention, from the viewpoints of hiding property, light-shielding property, etc., it is preferable that the film is composed of two layers of a resin film colored in white and a resin film colored in black. In particular, in the present invention, a colorant such as a white pigment is added to the resin pellets of the resin, and other various additives are optionally added, mixed well, and then whitened by forming a film. Similarly to a colored resin film, a colorant such as a black pigment is added to the resin resin pellets, and other various additives are optionally added, well mixed and then formed into a film. It is preferable to use a colored resin film consisting of two layers with a resin film colored in black by this, in this case, considering the viewpoint of simplification of the manufacturing process, etc., the mixed resin composition It is most desirable to use a laminate in which two layers are laminated by a coextrusion method.

In the above, as a method for forming a film,
For example, the film can be formed by an extrusion laminating method, a coextrusion laminating method, a T-die extrusion method, an inflation method, or any other known method.

Next, in the present invention, a resin film having heat sealability, a resin film having strength and heat resistance, a resin film having gas barrier properties and a steam barrier property are provided. Explaining other resin films such as the resin film having, as the material constituting such a film, the resin film or sheet described above, for example, low density polyethylene, medium density polyethylene, high density polyethylene, straight chain Low density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer resin, ethylene-ethyl acrylate copolymer, ethylene-
Acrylic acid copolymer, polyolefin resin such as methylpentene resin, polybutene resin, polyvinyl chloride resin, polyvinylidene chloride resin, vinyl chloride-vinylidene chloride copolymer, polyacrylic resin, polyacrylonitrile resin Resin, polystyrene resin, polyester resin, polyamide resin, polycarbonate resin, polyvinyl alcohol, saponified ethylene-vinyl acetate copolymer, fluorine resin, gen resin, polyacetal resin , And other known resin films or sheets can be used. In addition, for example, a film such as cellophane, synthetic paper, or the like can be used. In the present invention, any of the above-mentioned films or sheets may be used, such as unstretched film or uniaxially or biaxially stretched film. The thickness is arbitrary, but it can be selected from the range of several μm to 300 μm and used. Further, in the present invention, as the film, extrusion film formation, inflation film formation,
It may be any film such as a coating film.

In the present invention, the film of the resin having a heat-sealing property includes, for example, low density polyethylene, medium density polyethylene and high density from the above-mentioned films or sheets. Polyethylene, linear low-density polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ionomer-resin, ethylene-ethyl acrylate copolymer,
Films or sheets such as ethylene-acrylic acid copolymers, polyolefin resins such as methylpentene resins and polybutene resins, polyvinyl chloride resins, and the like can be used. In the present invention, as a resin film having a heat-sealing property, the resin used in the production of the film is used in the same manner as in the method for producing the colored resin film described above. , Producing a film of a resin having a colored heat-sealing property,
When this is used as a resin film having a heat seal property, the colored resin film having a heat seal property can be substituted for the colored resin film of the present invention.

In the present invention, the resin film having strength and high heat resistance has excellent strength, heat resistance, weather resistance and solvent resistance among the above-mentioned films or sheets. , A film with various toughness such as chemical resistance,
For example, a film or sheet of a resin such as polypropylene, polyamide resin, polyester resin or polycarbonate resin can be selected and used. In the present invention, the above film functions as a base film for a packaging bag. In addition, in the present invention, for example, a film obtained by coating a composition containing a polyvinylidene chloride resin in order to impart a gas barrier property or the like can be used for these films.

In the present invention, the resin film having a gas barrier property may be selected from the above-mentioned resins such as polyvinylidene chloride and polyvinyl alcohol.
Resin, saponified ethylene-vinyl acetate copolymer, fluorine-based resin or the like can be selected and the film or sheet can be used. In addition, as the gas barrier packaging material, for example, an aluminum foil or a vapor deposition film thereof, or a film having a film of a metal oxide such as silicon oxide or aluminum oxide can be used.

In the present invention, the film of the resin having moisture permeability includes, for example, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, from the above-mentioned resins. A polyolefin resin such as an ethylene-propylene copolymer can be selected and its film or sheet can be used.

The packaging bag for a bag-in-box according to the present invention is a packaging material in consideration of conditions such as the type of contents to be filled therein, the packaging purpose, the packaging form, the packaging method, the distribution form, the sales form, etc. Is designed, and a film or sheet suitable for them is selected, and they are superposed and used as a multiplex body. Thus, in the present invention,
The above-mentioned multiple body is bent or overlapped and the outer peripheral end portion is heat-sealed to form a bag bag for a bag-in-box. Therefore, the resin film having the heat-sealing property mentioned above, having strength,
And, as the resin film such as a resin film having high heat resistance, a resin film having a gas barrier property, and a resin film having a water vapor barrier property, basically, the resin film mentioned above is used as it is. However, in some cases, a film of another resin may be optionally laminated and used to impart another function to the film or sheet. For example, a resin film or gas barrier having the above-mentioned strength and being excellent in heat resistance.
A resin film such as a resin film having a property and a film having a water vapor barrier property can be used as it is, if it has a heat seal property by itself. In the case where the film has poor toseal property or does not have it, heat-seal property is imparted to these films, and then they are superposed to form a multiplex body, and then the outer peripheral ends of the four circumferences are formed. By heat-sealing, a packaging bag for bag-in-box can be manufactured.

As a method of providing the same, a laminate sheet can be produced by laminating the above-mentioned film or sheet with the above-mentioned resin film having a heat-sealing property. . As the laminating method, an ordinary method, for example, a wet laminating method, a dry laminating method, an extrusion laminating method, a co-extrusion coating laminating method, a T-die co-extrusion molding method, etc. may be adopted. You can At that time, isocyanate type (urethane type),
Anchors of polyethyleneimine type, polybutadiene type, etc.
Known anchor coats such as coating agents, laminate adhesives such as polyurethane-based, polyacrylic-based, polyester-based, etc.
Agents, adhesives and the like can be used. Alternatively, a resin constituting a film or sheet of the resin having the heat-sealing property mentioned above is selected, a composition using this as a vehicle is prepared, and the resin or film of another resin is prepared. The sheet may be coated with a usual coating or printing method to produce a coating film to impart heat sealability. In the above case, a colorant is added to the resin,
It may be kneaded well to form a film to produce a colored resin film, which may be used as a film of a resin having heat sealability. In this case, the colored heat sealability may be improved. The resin film which it has functions as a film of the colored resin of the present invention, and can be substituted by this.

Next, the injection port according to the present invention will be described. As the injection port, a part of the bag body is opened, and the opening is provided with a heat seal or the like. It is preferable to use a spout formed by molding a resin film forming a bag and a resin having heat sealability, for example, a polyethylene resin, a polypropylene resin, a polystyrene resin, a polycarbonate resin. It is possible to use a spout, a lid, and the like, which are manufactured by injection-molding a G-based resin or the like.

Next, in the present invention, the constitution of the packaging bag for a bag-in-box according to the present invention, which is made by using the above-mentioned materials, the manufacturing method thereof, etc., will be described with reference to the drawings with reference to a few examples thereof. explain. FIG. 1 is a schematic cross-sectional view showing the configuration of an example of a bag-in-box packaging bag using a colored resin film according to the present invention. FIG.
As shown in FIG. 1, first, the colored resin film 1 and the other resin film 2 are overlapped to form a multiplex body 3,
Further, an opening 4 is formed in the multiplex body 3, and then a spout 6 having a flange portion 5 is inserted from the inside of the opening 4 to insert the flange 5 of the spout 6 and the multiplex body 3. The polymerized portion of (3) is heat-sealed to form a seal portion (7), and
Install spout 6. In the figure, 8 indicates a lid of the spout 6. Next, in the present invention, the multiplex body 3 formed by superimposing another colored resin film 1 and another resin film 2 on the multiplex body 3 to which the spout 6 is attached is stacked, The outer peripheral end portion is heat-sealed, and the seal portions 9 are formed on the four circumferences, whereby the bag-in-box packaging bag A according to the present invention can be manufactured.

Next, a packaging bag for a bag-in-box according to another embodiment of the present invention will be exemplified. FIG. 2 is a schematic cross-sectional view showing the structure of another embodiment of the bag-in-box packaging bag. That is, first, as shown in FIG.
A resin film 10 having a resin property, a colored resin film 11 and a resin film 12 having a strength and a high heat resistance are prepared and stacked in this order to form a multiplex body 13.
Is configured. Next, the opening 4 is formed in advance in the multiplex body 13, and then the spout 6 having the flange portion 5 is inserted from the inside of the opening 4 to insert the flange 5 of the spout 6 and the multiplex body 13. The polymerized portion with and is heat-sealed to form a seal portion 7, and the spout 6 is attached to the multiplex body 13. In the figure, 8 indicates a lid of the spout 6. Next, according to the present invention, the multiplex body 13 having the spout 6 attached thereto faces another multiplex body 13 similar to the one formed above, and the resin film 10 having the heat-sealing property faces it. In this way, the packaging bag B for a bag-in-box according to the present invention is manufactured by stacking them, heat-sealing the outer peripheral ends thereof, and forming the seal portions 9 on the four circumferences. it can.

Further, as another example of the packaging bag for bag-in-box, FIG. 3 is a schematic cross-sectional view showing the structure of the packaging bag for bag-in-box of another form. That is, as shown in FIG. 3, first, a film 20 of a resin having a heat seal property, a film 21 of a colored resin, a film 22 of a resin having a barrier property, and having strength and heat resistance. A film 23 of abundant resin is prepared and stacked in that order to form the multiplex body 24. Next, the opening 4 is formed in advance in the multiplex body 24, and then the spout 6 having the flange portion 5 is inserted from the inside of the opening 4 to insert the flange portion 5 of the spout 6 and the multiplex body 24. The polymerized portion is heat-sealed to form a seal portion 7, and the spout 6 is attached to the multiplex body 24. In the figure, 8 indicates a lid of the spout 6. Next, in the present invention, another multiplex body 24 manufactured in the same manner as above is added to the multiplex body 24 to which the spout 6 is attached.
Are overlapped so that the film 20 of the resin having the heat-sealing property faces each other, and the outer peripheral end portion is heat-sealed.
By sealing and forming the seal portion 9 on the four sides thereof, the packaging bag C for bag-in-box according to the present invention
Can be manufactured.

As another example of the bag-in-box packaging bag of another form, FIG. 4 is a schematic cross-sectional view showing the structure of another form of the bag-in-box packaging bag. That is, as shown in FIG. 4, first, a film 30 of a resin having a heat-sealing property, and a film 3 of a colored resin.
1. A film 32 made of a resin having a parisability is prepared and laminated in that order to form a multiplex body 33.
Next, the opening 4 is formed in advance in the multiplex body 33, and then the spout 6 having the flange 5 is inserted from the inside of the opening 4 to form the multiplex 33 and the flange 5 of the spout 6. The polymerized portion with and is heat-sealed to form a seal portion 7, and the spout 6 is attached to the multiplex body 33. In the figure, 8 indicates a lid of the spout 6. Next, in the present invention, the multiplex body 33 having the spout 6 attached thereto faces another multiplex body 33 manufactured in the same manner as described above, and the resin film 30 having the heat seal property faces the multiplex body 33. Thus, the outer peripheral end portion is heat-sealed, and the seal portion 9 is formed on the four circumferences thereof to manufacture the bag-in-box packaging bag D according to the present invention. it can.

In the above, when a resin film having a barrier property or a resin film having a high strength and a high heat resistance is inferior in heat sealability by itself,
A film of a resin having heat sealability may be laminated on one side or both sides of the film to impart heat sealability. Alternatively, a heat seal is prepared by preparing a composition containing a resin having a heat seal property as a main component of a vehicle and coating the composition on one or both sides of a film to form a coating film. May be imparted.

The above-mentioned packaging bags for bag-in-box are merely a few examples, and in the present invention, depending on the purpose of filling and packaging, contents, filling and packaging method, distribution form, sales form, etc. It is possible to arbitrarily design the packaging, and thereby, it is possible to manufacture the packaging bag for the bag-in-box in various forms by arbitrarily selecting the materials, and the present invention is limited by the above-mentioned examples. Not a thing. In particular, in the present invention, when the colored resin films and the like are superposed to form a multiple body, the superposing order can be arbitrarily combined and superposed. In addition, in the present invention, the multiplex means a state in which the films of the respective resins are simply laminated, and the films of the respective resins are not adhered to each other.

Next, a method of filling and packaging using the bag for box for bag-in-box produced above will be explained. Such a method can be carried out by a conventionally known method. Remove the lid of the spout of the bag for bag-in-box,
It is possible to manufacture a filled package by measuring and filling a liquid beverage such as liquor or wine, and then covering the spout with a lid and sealing it.

[0027]

EXAMPLES Next, the present invention will be described more specifically by way of examples. Example 1 Twenty parts of titanium oxide as a white pigment was added to 100 parts by weight of linear low-density polyethylene and kneaded well, while similarly, carbon black as carbon black was added to 100 parts by weight of linear low-density polyethylene. Add 5 parts and knead well, and then use both of them to coextrude to a thickness of 15
A μm stretched polyamide film was co-extruded on one side to produce a laminate having the following constitution. Stretched polyamide film 15 μm / white linear low-density polyethylene film 30 μm / black linear low-density polyethylene film 30 μm Next, a linear low-density polyethylene film having a thickness of 60 μm is prepared, and the linear low-density polyethylene film is prepared. On top of this, the above-prepared laminate was superposed with the black linear low-density polyethylene film faces facing each other to produce a multiplex body. Next, an opening for attaching the spout is formed in the multiplex body, and then a polyethylene spout is attached to the opening by heat-sealing, and the same as the above with the multiplex with the spout attached. And the other multiplex produced as described above are laminated so that the surfaces of the linear low-density polyethylene film face each other, and the end portion of the outer periphery is heated over four rounds.
The packaging bag for bag-in-box according to the present invention was manufactured by tossing. The above-obtained packaging bag for bag-in-box was heat-filled with orange juice containing flesh by a usual method, then packed in a corrugated ball box and shipped as a commercial-use juice. After shipping, it was used by a user as a commercial jewel, but after use, the residue remaining in the bag-in-box packaging bag and adhering to the inner surface of the bag could not be seen through from the outside. There was no discomfort when the bag was discarded.

Example 2 Twenty parts of titanium oxide as a white pigment was added to 100 parts by weight of linear low-density polyethylene and kneaded well, while similarly 100 parts by weight of linear low-density polyethylene was mixed with 100 parts by weight of linear low-density polyethylene as a black pigment. -Bonblack 5 parts was added and kneaded well, and then both were used to produce an inflation film having the following constitution by an inflation coextrusion method. White linear low-density polyethylene film 40 μm / black linear low-density polyethylene film 30 μm Next, vinylidene chloride resin coated thickness 15
A stretched polyamide film having a thickness of .mu.m is prepared, and an anchor coating agent is coated on one side thereof, and then the coating surface and the white linear low-density polyethylene film of the inflation film produced above Extrude using polyethylene resin so that it faces the surface.
The layers were laminated by the John coating method to produce a laminate having the following constitution. Vinylidene chloride resin coated stretched polyamide film 15 μm / polyethylene layer 15 μm / white linear low-density polyethylene film 40 μm / black linear low-density polyethylene film 30 μm Next, a linear low-density polyethylene film having a thickness of 50 μm is prepared. Then, on the linear low-density polyethylene film, the laminate produced above was laminated with the black linear low-density polyethylene film faces facing each other to produce a multiplex body. Next, an opening for attaching the spout is formed in the multiplex body, and then a polyethylene spout is attached to the opening by heat-sealing, and the same as the above with the multiplex with the spout attached. And the other multiplex produced as described above are laminated so that the surfaces of the linear low-density polyethylene film face each other, and the end portion of the outer periphery is heated over four rounds.
The packaging bag for bag-in-box according to the present invention was manufactured by tossing. The above-obtained packaging bag for bag-in-box was heat-filled with orange juice containing flesh by a usual method, and then packed in a corrugated box to be shipped as a commercial-use juice. After shipping, it was used by a user as a commercial jewel, but after use, the residue remaining in the bag-in-box packaging bag and adhering to the inner surface of the bag could not be seen through from the outside. There was no discomfort when the bag was discarded.

Example 3 In Example 2, the white linear low-density polyethylene film 40 μm / black linear low-density polyethylene film 30 μm white linear low-density polyethylene film corona was formed on the surface of the inflation film. A laminate was produced by applying a treatment and then by a dry lamination method using a urethane adhesive to a laminated polyamide film having a thickness of 15 μm coated with a vinylidene chloride resin to produce a laminate. Just like
Similar results were obtained.

[0030]

As is apparent from the above description, the present invention focuses attention on a colored resin film as a resin film constituting a bag for a bag-in-box, and at least the colored resin film. And other films in combination to form a multiplex, and a packaging bag for a bag-in-box is formed using this, and a fruit-containing juice is contained in the packaging bag,
When the contents such as liquor and wine are filled and packaged, it has a concealing property without deteriorating the function as a packaging bag and can prevent see-through of the contents. Especially, it causes discomfort after use. It is possible to manufacture a packaging bag for a bag-in-box, which has no light-shielding property and is capable of preventing alteration of the contents and the like.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing the configuration of an example of a bag-in-box packaging bag using a colored resin film according to the present invention.

FIG. 2 is a schematic cross-sectional view showing a structure of a packaging bag for bag-in-box according to another embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view showing the structure of a packaging bag for bag-in-box according to still another embodiment of the present invention.

FIG. 4 is a schematic sectional view showing the structure of a packaging bag for bag-in-box according to still another embodiment of the present invention.

[Explanation of symbols]

 1 Colored resin film 2 Other resin film 3 Multiplex body 4 Opening part 5 Flange part 6 Spout 7 Seal part 8 Lid 9 Seal part A Bag-in-box packaging bag

Claims (4)

[Claims] 1. A resin film is bent or overlapped, and its outer peripheral end is heat-sealed to form a bag,
A bag-in-box packaging bag further comprising an injection port, wherein the resin film is a multiple body containing a colored resin film. 2. The multiplex has a resin film having heat-sealing properties, a resin film having strength and heat resistance, a resin film having gas barrier properties, and a water vapor barrier property. The packaging bag for a bag-in-box according to claim 1, comprising at least one film selected from resin films and a colored resin film. 3. The packaging bag for bag-in-box according to claim 1, wherein the colored resin film comprises a white resin film and a black resin film. 4. The packaging bag for a bag-in-box according to claim 3, wherein the white resin film and the black resin film are a coextruded laminate.