JP3267792B2 - Beverage bag-in-box bag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bag for a bag in a beverage (Bag in Box), and more particularly, to a liquid or mineral water classified as "milk" in the ordinance of the Ministry of Milk and the like, such as raw milk, milk and processed milk. The present invention relates to a bag for a beverage bag-in-box suitably used for transportation and storage of beverages and the like.

[0002]

2. Description of the Related Art In recent years, bag-in-boxes, which are so-called one-way containers of disposable type, have been widely used for transporting and storing various liquids such as beverages such as mineral water and industrial chemicals.

[0003] This bag-in-box uses a foldable bag-in-box bag or container made of plastic for the interior and a corrugated cardboard box exterior to the interior, and has water resistance and chemical resistance to the contents liquid. The structure is such that the gas barrier properties and the like are given to the interior plastic bag or container, while the rigidity required for transportation and storage is given to the exterior. Compared to conventional glass bottles, tin cans, etc., the bag-in-box constructed in this way does not require collection, which contributes to labor saving and cost saving, and is easy to transport and store empty containers because it can be folded. This has the advantage that the distribution cost can be reduced.

On the other hand, as containers for liquids classified as "milk" in the ordinance of the Ministry of Milk, such as raw milk, milk, and processed milk, containers made of polyethylene-processed paper called so-called milk cartons have been widely used.

However, the above milk carton is
Although it has excellent properties mainly as a small container for home use, it has a drawback that it is not always suitable in terms of its capacity, strength, etc., for example, for business use or transportation between factories.

Here, for example, the use of a bag-in-box as a large container suitable for business use or transportation between factories is conceivable, but the conventional bag-in-box is required for containers such as raw milk and milk. Those that sufficiently satisfy the required properties such as safety and strength have not yet been developed.

Accordingly, the present applicant has developed a bag for a milk bag-in-box which sufficiently satisfies various characteristics such as safety and strength required for containers of raw milk, milk and the like.
An application has already been filed (Japanese Patent Application No. 5-120802,
Japanese Patent Application No. 5-222380).

As shown in FIG. 14, for example, this milk bag-in-box bag is made of high-density polyethylene (HD).
PE) and two or more coextruded PE films (eg, HDPE / LDPE or HDPE / LDPE / HDPE) composed of low density polyethylene (LDPE),
These co-extruded PE films are laminated without bonding to form a co-extruded PE film group laminate 2, and the four-side seal portion 3 is sealed in all directions with two co-extruded PE film group laminates 2 superposed. It is formed.
Further, in the bag 1 for a dairy bag-in-box, the outermost layer of the co-extruded PE film group laminate 2 is made of HDPE.
And the facing layer between each co-extruded PE film is L
The innermost layer of the coextruded PE film group laminate 2 is an LDPE layer.

In this bag for a dairy bag-in-box, the innermost layer and the injection pouring port of the bag body that directly comes into contact with the "milk" as the contents are both formed by LDPE. In addition, sufficient safety and strength satisfying the above-mentioned standards are secured, recycling is easy, and heat sealability is also secured.

[0010] The outermost layer of the bag body is formed of an HDPE layer. This HDPE layer has excellent heat resistance and mechanical strength, is not affected by heat during heat sealing, and is hard to expand. As a result, an excellent dairy bag-in-box bag can be obtained.

Furthermore, since the co-extruded PE films are superposed without bonding, and the facing layer between the co-extruded PE films is formed by the LDPE layer, the slip between the co-extruded films is good. Thus, a favorable buffer effect is exhibited in distribution.

[0012]

However, the bag for a dairy bag-in-box is difficult to remove from the exterior of a cardboard box or the like, and it is difficult to discharge the residual liquid remaining inside the bag, and it is easy to handle and work. There is room for improvement in sex.

That is, generally, the contents are taken out of the bag-in-box from the spout, which is an injection spout, with the bag-in-box bag, which is the interior, stored in the cardboard box, which is the exterior. In the case of using all at once, it is better to take out the bag-in-box bag from the outer cardboard box and use it. However, the above-mentioned bag for a milk bag-in-box,
It is difficult to remove from the exterior such as a cardboard box, and it is also inconvenient to handle the bag-in-box bag after removing it from the exterior. Furthermore, when suspending the bag-in-box bag for discharging the residual liquid remaining inside the bag, a separate holding tool is required, which is inconvenient to handle.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a container for raw milk, milk and the like which only sufficiently satisfies various characteristics such as safety and strength. In addition, it is easy to take out from the exterior, and it is easy to handle after taking out from the exterior, and it is easy to discharge the residual liquid remaining inside the bag body, so that the bag for beverage bag-in-box has good handling and workability. Is to provide the body.

[0015]

In order to achieve the above object, a bag for a beverage bag-in-box according to the present invention comprises a bag body made of a polyethylene (PE) film, an infusion spout attached to the bag body. A bag body for a bag-in-box comprising: a bag body formed by being sealed four-sided in a state where two PE film group laminates are overlapped with each other, and the PE film group laminate is made of high-density polyethylene (H
DPE) and two or more PE films including at least one co-extruded PE film of low density polyethylene (LDPE) are laminated without bonding between the PE films, and the innermost layer of the bag body is The infusion spout is formed of an LDPE layer, and the injection spout comprises a spout made of LDPE and heat-sealed to the inner surface of the bag body, and a cap made of HDPE attached to the spout, and a handle portion is provided on the bag body. There is a configuration.

The bag for a beverage bag-in-box according to the present invention, if necessary, has a structure in which the handle is formed integrally with the bag body in the bag for a beverage bag-in-box. Alternatively, the handle portion is formed by joining a handle portion forming member formed separately from the bag body to the bag body, or the inner peripheral edge of the handle portion is further strengthened by heat sealing. There is.

Further, the bag for a beverage bag-in-box according to the present invention is configured such that the handle portion is formed by cutting in the bag for a beverage bag-in-box as required.

Further, in the bag for a beverage bag-in-box according to the present invention, if necessary, the outermost layer of the bag body may be formed by the HDPE layer of the co-extruded PE film. There is a configuration that has been formed.

In the bag for a beverage bag-in-box according to the present invention, if necessary, in the bag for a beverage bag-in-box, the PE film group laminate may include a plurality of the co-extruded PE films. A co-extruded PE film group laminate formed by sealing four sides in a state of being superposed without bonding between co-extruded films, wherein the innermost layer of the bag body is an LDPE layer of the co-extruded PE film group laminate. The outermost layer of the co-extruded PE film group laminate is an HDPE layer, or the facing layer between the co-extruded PE films is an LDPE layer.
The structure is a PE layer.

Further, the bag for a beverage bag-in-box according to the present invention has a configuration in which the inside of the four-side seal portion is further overlapped by a four-side seal, if necessary, in the bag for a beverage bag-in-box. .

[0021]

The bag for a beverage bag-in-box according to the present invention comprises:
Since the handle is provided on the bag for the beverage bag-in-box, the bag for the beverage bag-in-box can be easily taken out from the exterior such as a cardboard box, and the bag-in-bag for the bag can be taken out from the exterior. Later handling is also easy. Furthermore, when the bag-in-box bag is suspended to discharge the residual liquid remaining inside the bag, the bag may be suspended at the handle, so that a separate holding tool is not required and the operation is easy. As described above, the bag for a beverage bag-in-box of the present invention has good handleability and workability.
In addition, if the handle is formed by cutting, no waste of the film occurs when the handle is formed.

Further, the beverage bag-in-box bag of the present invention can easily discharge the residual liquid remaining inside the bag by hanging the handle at the handle after discharging the beverage. Yes, the residual liquid inside the bag can be reduced to a very low level, so that when the bag is discarded (incinerated), no odor due to the residual liquid inside the bag is generated. Recycling can be easily performed.

[0023]

Next, embodiments of the present invention will be described with reference to the drawings. 1 to 3 are explanatory views each showing an embodiment of a bag for a beverage bag-in-box according to the present invention.

As shown in FIGS. 1 to 3, this bag 1
A bag body 4 formed by sealing a four-sided seal portion 3 in a state where two PE film group laminates 2 each composed of a plurality of polyethylene (PE) films are superimposed.
And an injection pouring port 5, and a handle portion 6.

In the bag for beverage bag-in-box shown in FIG. 1, a pair of handles 6 are provided at both ends of the side of the bag 1 on the side where the injection spout 5 is provided. Handle part 6
Is provided on the side of the bag body 1 where the injection spout 5 is provided, if the inside of the four-side seal portion 3 on the side opposite to this side is cut, the residual liquid remaining inside the bag body is easily discharged. This is in order to be able to do so. In addition, in order to form a pair of the handle portions 6, the operation with both hands is facilitated, and the stability at the time of suspending the bag for discharging the residual liquid remaining inside the bag is improved. . This handle portion 6 has an insertion port 6
a, and the size of the handle 6
The shape is such that the hand can be easily inserted into the insertion opening 6a of the handle part 6, and is easy to hold, and the hand is not hurt when held.

The handle portion 6 includes a plurality of Ps constituting the bag body 4.
A handle forming member formed by punching or cutting out a material (sheet) similar to the PE film group laminate 2 made of an E film or a material different from the PE film group laminate 2 is formed by heat sealing or using an adhesive. It is formed by being joined to the bag body 4 by using it or the like.

In FIG. 2, a pair of handle portions 6 are formed at corners of the bag 1 on the side where the injection port 5 is located. The reason why the handle portion 6 is formed at the corner of the bag body 1 on the side where the injection spout 5 is provided and the reason why a pair of handle portions 6 are formed are the same as those in FIG. 1 described above. The handle 6 has an elliptical shape having an insertion opening 6a. The size and shape of the handle 6 allow the hand to be easily inserted into the insertion opening 6a of the handle 6 and to be easily held. But in a size and shape that will not hurt.

This handle portion 6 is formed by punching or cutting out a pair of insertion holes 6a at the corners of the PE film group laminate 2 composed of a plurality of PE films constituting the bag body 4 on the side where the injection port 5 exists. , These insertion holes 6
a is formed integrally with the bag body 4 by heat-sealing the periphery of a. The punching or cutting of the insertion port 6a may be performed after heat sealing the peripheral edge of the insertion port 6a, at the same time as heat sealing, or before heat sealing. Further, the heat seal portion 6 at the periphery of the insertion port 6a is provided.
Since b also serves as the four-side seal part 3 of the PE film group laminate 2 constituting the bag body 4, it is necessary to seal the heat seal part 6b and the four-side seal part 3 so as to be continuous.

In FIG. 3, the handle portion 6 is formed on the side of the bag body 4 on the side where the injection pouring port 5 is provided by a sheet-like handle portion forming member 7 by a heat sealing method or using an adhesive. It is formed by joining. The handle portion forming member 7 is made of the same material as the PE film group laminated body 2 constituting the bag body 4 and has a pair of elliptical insertion ports 6a. In addition, the periphery of the insertion port 6a may be heat-sealed to have strength. Also,
The PE film group laminate on the side of the bag body 4 where the injection pouring port 5 is provided, without using the handle part 6 to join the handle part forming member 7 separate from the bag body 4 to the bag body 4. 2
May be extended, and an insertion opening 6 a may be formed in the extended portion to form the handle portion 6.

4 to 12 are explanatory views showing the bag 1 in which the handle 6 is formed by cutting.
That is, in these bags 1, the handle portion 6 has the insertion opening 6a formed by punching out or cutting out a part of the forming material of the bag 1, as described above with reference to FIGS. Unlike the beverage bag-in-box bag described above, the handle portion 6 is formed by a simple cut without removing a part of the forming material of the bag 1. As described above, when the handle portion 6 is formed by cutting, it is not necessary to punch out or cut out a part of the material for forming the bag when forming the handle, so that the film as the material for forming the bag 1 is not necessary. There is no waste.

In the bag for beverage bag-in-box shown in FIGS. 4 and 5, the three sides of the PE film group laminated body 2 constituting the bag body 4 are sealed on three sides to form seal portions 3a and 3b. , 3c are formed, and the space between the injection spout 5 and the handle 6 is sealed to form a seal 3d.

Here, the handle part 6 has a pair of cuts 8 formed in the PE film group laminate 2. The size and shape of the cut 8 may be any size and shape that can be easily inserted by a hand and that does not hurt the hand when held easily. 4 to 7 show various shapes of the cut 8.

When the handle portion 6 is formed by the cuts 8 as described above, depending on the shape of the cuts 8, the PE film group laminate 2 around the cuts 8 may be turned, broken, or torn. Since inconvenience may occur, it is preferable to provide strength around the cut 8.

For example, in the bag 1 shown in FIG.
The notch 8 is formed near the central portion, leaving an uncut portion 9. The uncut portion 9 causes the PE film group laminate 2 on one side and the PE film group laminate 2 on the other side to be partially continuous with the cut 8 as a boundary. There is no inconvenience such as the PE film group laminated film 2 being turned up, broken, or torn.

In the bag 1 shown in FIG. 8, when a hand or a support is inserted through an insertion opening (not shown) of the handle 6, the uncut portion 9 may be cut. When the width of the portion 9 is set to 0.5 mm or less, the uncut portion 9 is cut by pressing the PE film group laminated film 2 along the cut 8 to form an insertion opening.

FIGS. 9 to 12 are explanatory views showing an example in which the reinforcement seal portion 10 is formed by heat sealing the periphery of the cut 8 in order to impart strength to the periphery of the cut 8.

By forming the reinforcing seal portion 10 around the cut 8 as described above, the strength around the cut 8 is improved, and the PE film group laminated film 2 around the cut 8 is turned up or broken. Or inconvenience such as tearing can be prevented.

It should be noted that the bag 1 for a beverage bag-in-box according to the present invention is not limited to the embodiment shown in FIGS. 1 to 12 and depends on the size of the bag 1 and the weight of the contents. The design is changed as needed. For example, the formation position, shape, size, number, formation method, strength (joining strength and strength of the handle part itself), etc., of the handle part 6 and the insertion opening 6a are appropriately designed and implemented.

The bag body 4 forming the bag 1 for a beverage bag-in-box according to the present invention comprises a specific PE film, that is, two PE film laminates 2 each composed of a plurality of PE films, and It is formed by sealing.

Here, in this embodiment, as shown in FIG. 13, the PE film group laminate 2 is formed by co-extrusion of high-density polyethylene (HDPE) and low-density polyethylene (LDPE). The coextruded PE films 11, 12, and 13 were coextruded from the outside into coextruded PE film 11, coextruded PE film 12, and coextruded PE film 1.
In the order of No. 3, each film is formed by simply overlapping each other without bonding.

Here, in the present invention, high-density polyethylene (HDPE) refers to polyethylene having a density of 0.94 or more, and low-density polyethylene (LDPE) refers to polyethylene having a density of less than 0.94. Further, these high-density polyethylene (HDPE) and low-density polyethylene (LDPE) are required to satisfy the following criteria for the dissolution test for heavy metals, evaporation residues and potassium permanganate consumption.

That is, dissolution test (60 ° C., 30 minutes)
Medium, 1 ppm or less for heavy metals (4% acetic acid in leaching solution), 15 p for evaporation residue (4% acetic acid in leaching solution)
pm or less, potassium permanganate consumption (leaching solution water)
Is 5 ppm.

With respect to the burst strength and the pinhole, it is not required to satisfy a certain standard by a special application under the ordinance of the Ministry of Milk and the like. However, the burst strength is 5 kgf / cm ² when “milk”, which is the content of the bag 1 formed using these polyethylenes, is a low-temperature distribution product.
As described above, it is preferably 8 kgf / cm ² or more in the case of a product distributed at ordinary temperature. For pinholes,
Preferably, there is no pinhole.

Coextruded PE film 11 constituting the outermost layer
Has a two-layer structure of an HDPE layer 11a and an LDPE layer 11b, and the thickness of the HDPE layer 11a is usually 30 μm to
50 μm. Further, the thickness of the LDPE layer 11b is usually 70 μm to 120 μm. In this embodiment, H
The thickness of the DPE layer 11a is 30 μm, and the LDPE layer 1
The thickness of 1b is 100 μm.

The co-extruded PE film 11 constituting the outermost layer is overlaid with a co-extruded PE film 12 adjacent thereto. The co-extruded PE film 12 constituting the middle layer is composed of the LDPE layer 12a, the HDPE layer 12b, and the LDP
It has a three-layer structure with the E layer 12c.

Here, the thickness of each of the LDPE layers 12a and 12c and the HDPE layer 12b is usually 20 to 4
0 μm. In this embodiment, each layer has a thickness of 2
It is 0 μm.

The coextruded PE film 1 constituting the middle layer
In FIG. 3, a co-extruded PE film 13 is superimposed adjacent thereto. The layer configuration of the co-extruded PE film 13 constituting the innermost layer and the thickness of each
It is the same as E film 12.

As described above, the layer structure of the bag body 4 is such that [HDPE layer 11a / LDPE layer 11
b] / [LDPE layer 12a / HDPE layer 12b / LDP
E layer 12c] / [LDPE layer 13a / HDPE layer 13b
/ LDPE layer 13c], the outermost layer is formed by HDPE, and the innermost layer is formed by LDPE.

Here, the reason why the outermost layer is formed of HDPE is that HDPE is superior in heat resistance and mechanical strength as compared with LDPE, is not affected by heat at the time of heat sealing, and is hardly stretched, so that holes are hardly opened. The reason why the innermost layer is formed of LDPE is to ensure heat sealability.

Each of the co-extruded PE films 11, 12,
Numeral 13 denotes a seal that is sealed on all sides and is superimposed.
The whole surfaces of the coextruded PE films are not bonded together. Therefore, slippage occurs between the opposing layers between each co-extruded PE film,
The facing layer between each co-extruded PE film is LDP
Since it is the E layer, the sliding is good, and a favorable buffer effect is obtained in distribution.

The bag body 4 having the above-described structure has the same structure as the conventional bag-in-bag for beverage shown in FIG.
LDPE spout 21 and HDPE cap 22
Is attached.

Specifically, the LDPE layer 13c constituting the innermost layer of the bag body 4 and the spout 21 made of LDPE are heat-sealed, and the screw cap 22 is attached to the spout 21. The spout 21 is attached to a spout hole (not shown) provided in the bag body 1.

The sealing strength of the bag thus formed must be free from breakage and air leakage. The bag 1 for a beverage bag-in-box of the present invention is not limited to the above-described embodiment, and may be appropriately modified and implemented.

For example, the PE film group laminate 2 constituting the bag body 1 is not limited to the one shown in FIG. 13. For example, [HDPE layer (thickness: 30 to 50 μm) / LDPE Layer (thickness 70-120μ)
m)] + LDPE film (40-80 μm thickness) + L
A triple bag made of a DPE film (thickness of 40 to 80 μm) (PE film group laminate), [HDPE layer (thickness of 30 to 80 μm)
50 μm) / LDPE layer (thickness: 70 to 120 μm)] +
[LDPE layer (thickness: 20 to 40 μm) / HDPE layer (thickness: 20 to 40 μm) / LDPE layer (thickness: 20 to 40 μm)
m)] (double co-extruded PE film group laminate) or [HDPE layer (thickness: 30 to 50 μm) / L
DPE layer (thickness: 70 to 120 μm)] + [LDPE layer (thickness: 20 to 40 μm) / HDPE layer (thickness: 20 to 40)
μm) / LDPE layer (thickness: 20 to 40 μm)] + [LD
PE layer (thickness 20 to 40 μm) / HDPE layer (thickness 20
４０40 μm) / LDPE layer (thickness 20 to 40 μm)] +
[LDPE layer (thickness: 20 to 40 μm) / HDPE layer (thickness: 20 to 40 μm) / LDPE) layer (thickness: 20 to 40 μm)
m)] (a quadruple bag made of (co-extruded PE film group laminate)).

Further, in place of the outermost layer coextruded PE film composed of the HDPE layer / LDPE layer in the above-described 2 to 4 double bags, the outermost layer coextruded PLD composed of the LDPE layer / HDPE layer is used.
An E film may be used. Thus, when the outermost layer co-extruded PE film is an LDPE layer / HDPE layer,
The impact strength can be improved. More specifically, in the layer structure shown in FIG. 13 described above, heat sealing is performed from the outermost layer side (upper side in the figure) in the bag making process, but this heat sealing deteriorates the surface resistant HDPE. In addition, the distance between the middle and inner layer co-extruded PE films, which are sealants, is too long, and sufficient impact strength cannot be obtained.
If the bag is dropped only from a height of cm, the bag will break. On the other hand, when the outermost layer co-extruded PE film in the above-described embodiment is an LDPE layer / HDPE layer,
Even when the bag is dropped five times with only the bag from a height of 90 cm, sufficient impact strength can be obtained without the occurrence of bag breakage.

Further, the bag for a beverage bag-in-box according to the present invention is the same as the bag for a beverage bag-in-box in the above-described embodiment, except that the inside of the four-side seal portion is further overlapped with a four-side seal (double seal). ). In this case, it is preferable that the four corners of the inner four-side seal are also sealed in a curved shape.

This bag for beverage bag-in-box,
For example, it can be particularly suitably used as a container for products classified as "milk" in ministerial ordinances such as raw milk, milk and processed milk, and used in a state of being stored in an outer cardboard box.

[0058]

As described above, according to the bag for a beverage bag-in-box of the present invention, the handle portion is provided on the bag for a beverage bag-in-box. The bag for the bag is easily taken out of the exterior such as a cardboard box, and the bag-in-box bag is also easily handled after being taken out of the exterior. Furthermore, when hanging the bag-in-box bag for discharging the residual liquid remaining inside the bag, no separate holding tool is required, and the work is easy. Thus, the bag body for a bag-in-box of the present invention has good handleability and workability.

In addition, the bag-in-bag for beverage bag of the present invention can reduce the residual liquid inside the bag very much.
When the bag is discarded (during incineration), an unpleasant odor due to the residual liquid inside the bag is not generated, or the bag can be easily recycled.

Further, if the handle is formed by cutting, there is no waste in the film, which is advantageous from the viewpoint of resource saving.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of a bag for a beverage bag-in-box according to the present invention.

FIG. 2 is a plan view showing another embodiment of the beverage bag-in-box bag of the present invention.

FIG. 3 is a plan view showing another embodiment of the beverage bag-in-box bag of the present invention.

FIG. 4 is a plan view showing another embodiment of the bag for beverage bag-in-box of the present invention.

FIG. 5 is a plan view showing another embodiment of the bag for a beverage bag-in-box of the present invention.

FIG. 6 is a partially cutaway plan view showing another embodiment of the bag-in-bag for beverage bag of the present invention.

FIG. 7 is a partially cutaway plan view showing another embodiment of the beverage bag-in-box bag according to the present invention.

FIG. 8 is an enlarged view showing an example in which a handle of the bag-in-bag for beverage of the present invention is formed by cutting.

FIG. 9 is a partially cutaway plan view showing another embodiment of the bag for a beverage bag-in-box of the present invention.

FIG. 10 is a partially cutaway plan view showing another embodiment of the bag for a beverage bag-in-box of the present invention.

FIG. 11 is a partially cutaway plan view showing another embodiment of the bag for a beverage bag-in-box according to the present invention.

FIG. 12 is a partially cutaway plan view showing another embodiment of the bag for a beverage bag-in-box of the present invention.

FIG. 13 is a partial cross-sectional view showing one example of a PE film group laminate constituting the bag for beverage bag-in-box of the present invention.

FIG. 14 is a perspective view showing a conventional dairy bag-in-box bag.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Beverage bag-in-box bag body 2 ... PE film group laminated body 3 ... Four-side seal part 4 ... Bag body 5 ... Injection and pouring tool 6 ... Handle part 6a ... Insertion port 7 ... Handle part forming member 8 ... Cut 11 ... Coextruded PE film 11a ... High density polyethylene (HDPE) layer 11b ... Low density polyethylene (LDPE) layer 12 ... Coextruded PE film 13 ... Coextruded PE film 21 ... Spout 22 ... Cap

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification code FI B65D 77/06 B65D 77/06 F 85/72 85/72 F (56) References JP-A-5-319454 (JP, A) JP-A-5-77842 (JP, A) JP-A-7-2255 (JP, A) JP-A-57-154654 (JP, A) JP-A-7-2274 (JP, A) (JP, U) Japanese Utility Model Showa 63-27320 (JP, U) Japanese Utility Model Showa 62-80834 (JP, U) Japanese Utility Model Showa 51-4554 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷⁾ B65D 30/08 B65D 33/06-33/14 B65D 33/36-33/38 B65D 77/06 B65D 85/72-85/80

Claims (9)

(57) [Claims] 1. A bag-in-box bag comprising a bag main body made of a polyethylene (PE) film and an injection spout attached to the bag main body, wherein the bag main body is composed of two PE film groups. The laminate is formed by being sealed four-sided in a state where the laminate is superimposed, and the PE film group laminate includes at least one coextruded PE film of high-density polyethylene (HDPE) and low-density polyethylene (LDPE). PE films are stacked without bonding between the PE films, the innermost layer of the bag body is formed by an LDPE layer,
An LDPE spout in which the injection spout is heat-sealed to the inner surface of the bag body, and an H attached to the spout.
A bag for a beverage bag-in-box, comprising a DPE cap, wherein a handle portion is provided on the bag body. 2. The bag for a beverage bag-in-box according to claim 1, wherein the handle is formed integrally with the bag body. 3. The bag for a beverage bag-in-box according to claim 1, wherein the handle portion is formed by joining a handle portion forming member formed separately from the bag body to the bag body. 4. The bag-in-box bag for a beverage bag according to claim 1, wherein an inner peripheral edge of the handle portion is reinforced by heat sealing. 5. The bag for a beverage bag-in-box according to claim 1, wherein the handle is formed by cutting. 6. The bag for a beverage bag-in-box according to claim 1, wherein the outermost layer of the bag body is formed by an HDPE layer of the co-extruded PE film. 7. A co-extruded PE film group laminate formed by sealing the four sides of a plurality of the co-extruded PE films in a state where the plurality of co-extruded PE films are stacked without bonding between the co-extruded films. Wherein the innermost layer of the bag body is formed by the LDPE layer of the co-extruded PE film group laminate, the bag for a beverage bag-in-box. 8. The bag for a beverage bag-in-box according to claim 7, wherein the outermost layer of the co-extruded PE film group laminate is an HDPE layer, and a facing layer between the co-extruded PE films is an LDPE layer. . 9. The bag for a beverage bag-in-box according to claim 1, wherein the inside of the four-side seal portion is further overlapped by a four-side seal.