JP3124657B2 - Bags for milk bag-in-box - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a bag-in-box (Bag-in-box).
in Box) for bags, especially raw milk, milk, processed milk, etc.
The present invention relates to a bag for a milk bag-in-box, which is suitably used for transporting and storing a liquid classified as “milk” according to a ministerial ordinance.

[0002]

2. Description of the Related Art Bag-in-boxes, which are disposable so-called one-way containers, 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 or container made of plastic for the interior and a corrugated cardboard box on the interior, and is provided with water resistance, chemical resistance, gas barrier property and the like to the liquid content. The structure is such that the rigidity required for transportation and storage is provided to the exterior while the plastic is provided. 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.

[0005]

However, the above-mentioned milk carton has excellent properties mainly as a small container for home use, but it is not suitable for use in business or transportation between factories, for example. There is a disadvantage that it is not always appropriate in terms of capacity, strength, and the like.

For this reason, it is conceivable to use a bag-in-box as a large-sized container suitable for business use or transportation between factories, for example. A conventional bag-in-box is required for containers such as raw milk and milk. Those that sufficiently satisfy various properties such as safety and strength have not yet been developed.

The present invention has been made in view of such circumstances, and an object of the present invention is to sufficiently satisfy various properties such as safety and strength required for containers of raw milk, milk, and the like.
An object of the present invention is to provide a bag for a milk bag-in-box that can be suitably used for transportation and storage of products classified as "milk" in the Ministerial Order of Milk.

[0008] To achieve the above object, the structure of the present invention is as follows.
What is claimed is: 1. A bag-in-box bag comprising a bag body made of a polyethylene (PE) film, and an injection port attached to the bag body, wherein the bag body is made of high-density polyethylene (HDPE) and low-density polyethylene ( LDPE)
Are formed by laminating a plurality of co-extruded films consisting of a plurality of co-extruded films each other without bonding between the co-extruded films by a four-sided seal, and the outermost layer of this co-extruded film group is HDPE. And the facing layer between each coextruded film is L
A spout made of LDPE, wherein the innermost layer of the group of co-extruded films is formed of an LDPE layer, and the injection spout is heat-sealed to the inner surface of the bag body; and an HDPE attached to the spout. It is a bag for a dairy bag-in-box, characterized by comprising a cap made of a product.

In the bag for a dairy bag-in-box according to the present invention, the above-mentioned co-extruded film group is formed by laminating three co-extruded films, and the outer co-extruded film is the outermost layer from the outside to the inside. 2 of HDPE layer and LDPE layer
The intermediate co-extruded film is composed of three layers of the LDPE layer, the HDPE layer, and the LDPE layer from the outside to the inside.
The inner co-extruded film is composed of an LDPE layer, an HDPE layer, and an innermost LDPE layer.
A dairy bag-in-box bag characterized by having a three-layer structure with a layer.

Further, another configuration for solving the above-mentioned problem is as follows.
What is claimed is: 1. A bag-in-box bag comprising a bag body made of a polyethylene (PE) film, and an injection port attached to the bag body, wherein the bag body is made of high-density polyethylene (HDPE) and low-density polyethylene ( LDPE)
And two or more polyethylene (PE) films including at least one co-extruded film are formed by superimposing with a four-sided seal, the outermost layer is formed by the HDPE layer of the co-extruded film, and the pouring spout Comprises a spout made of LDPE that is heat-fused to the inner surface of the bag body and a cap made of HDPE attached to the spout, and the inside of the four-side seal portion is further overlapped by a four-side seal. It is a bag for a bag-in-box. Alternatively, polyethylene (P
E) A bag body for a bag-in-box having a bag body made of a film and an injection spout attached to the bag body, wherein the bag body is made of high-density polyethylene (HDP).
E) and two or more polyethylene (P) containing at least one coextruded film of low density polyethylene (LDPE).
E) The film is formed by laminating with a four-sided seal, and the outermost layer is the HDP of the coextruded film.
An E layer, wherein the injection spout comprises an LDPE spout which is thermally fused to the inner surface of the bag body, and an HDPE cap attached to the spout,
A dairy bag-in-box bag characterized in that the inside of the four-side seal portion is partially overlapped with a seal.

[0011]

The bag for a milk bag-in-box according to the present invention comprises a bag body made of a polyethylene (PE) film, and an injection spout attached to the bag body.
Here, the bag body is formed by laminating two or more polyethylene (PE) films including at least one coextruded film of high-density polyethylene (HDPE) and low-density polyethylene (LDPE) with a four-sided seal. The outermost layer is formed by the high density polyethylene (HDPE) layer of the coextruded film. That is,
Since both the bag body and the pouring spout that are in direct contact with the contents of "milk" are made of polyethylene (PE), sufficient safety and strength to satisfy the standards of the Ministry of Milk and the like are secured. And easy to recycle. In addition, the bag body has at least two sheets of polyethylene (P
E) The polyethylene (PE) film, which is formed by laminating films by a four-sided seal and forms at least the outermost layer of the bag body, is a co-extruded film of high-density polyethylene (HDPE) and low-density polyethylene (LDPE). Constituting high density polyethylene (HDP
E) It is formed of a layer. Therefore, the outermost layer of the bag body is made of a high-density polyethylene (HDPE) layer that is excellent in heat resistance and strength, and is not easily stretched.
The inner layer is made of low-density polyethylene (LDP)
E) Since it is composed of a layer, it has a favorable property in terms of distribution that two or more polyethylene (PE) films constituting the bag main body have a good sliding property and an excellent cushioning effect, and a hole is not easily opened in the bag main body. ing. Moreover, of the cap and the spout constituting the injection spout, the spout thermally fused to the inner surface of the bag body is made of low-density polyethylene (LDP).
Since it is formed by E), the heat sealability is good.

Further, in another configuration of the present invention, the inside of the four-side seal portion is further overlapped by a four-side seal in the above-mentioned bag for a milk bag in box of the present invention. When an external impact is applied to the body, the four-side seal located inside serves as a shock absorber and absorbs the shock from the internal liquid, and the seal located outside the four-side seal located inside breaks. It becomes difficult. Also, even if the four-sided sealing portion located inside is torn, milk and the like do not leak outside since there is a sealing portion located outside.

[0013]

Next, a first embodiment of the present invention will be described, and the present invention will be described more specifically. FIG. 1 is an explanatory view showing a bag for a milk bag-in-box according to the first embodiment, and FIG. 2 is an explanatory view showing a configuration of the bag body.

As shown in FIG. 1, the bag for a milk bag-in-box according to the first embodiment is made of polyethylene (P).
E) It has a bag body 1 made of a film and an injection spout 2 attached to the bag body 1.

As shown in FIG. 2, the bag body 1 in this embodiment is made of high-density polyethylene (HDP).
E) and three co-extruded films 11, 12, and 13 formed by co-extrusion of low-density polyethylene (LDPE) are superposed by a four-sided seal from the outside in the order of co-extruded film 11, co-extruded film 12, and co-extruded film 13. It is formed. In FIG. 1, reference numeral 3 denotes an outer four-side seal portion.

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.

The burst strength and the pinhole are not required to satisfy a certain standard by a special application under the ordinance of the Ministry of Milk and the like. However, the bursting strength is 5 kgf / cm ² when the “milk”, which is the content of the bag body 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.

The coextruded film 11 constituting the outermost layer has a two-layer structure of a high-density polyethylene (HDPE) layer 11a and a low-density polyethylene (LDPE) layer 11b. The thickness of the high-density polyethylene (HDPE) layer 11a is , Usually 30 μm to 50 μm. The low-density polyethylene (LDPE) layer 11b usually has a thickness of 70 μm or more.
120 μm. In this embodiment, the thickness of the high-density polyethylene (HDPE) layer 11a is 30 μm, and the thickness of the low-density polyethylene layer 11b is 100 μm.

The coextruded film 11 constituting the outermost layer
, A co-extruded film 12 is superimposed adjacent thereto. The co-extruded film 12 constituting the middle layer includes a low density polyethylene (LDPE) layer 12a, a high density polyethylene (HDPE) layer 12b, and a low density polyethylene (LD
(PE) layer 12c.

Here, low density polyethylene (LDPE)
Layers 12a and 12c and a high density polyethylene layer (HDP
E) The thickness of the layer 12b is usually 20 to 40 μm.
m. In this embodiment, each layer has a thickness of 20 μm.
m.

The co-extruded film 13 constituting the middle layer is overlaid with the co-extruded film 13 adjacent thereto. The layer configuration of the coextruded film 13 constituting the innermost layer and the thickness of each layer are the same as those of the coextruded film 12.

As described above, the layer structure of the bag body 1 is such that [the high density polyethylene (HDPE) layer 11a / the low density polyethylene (LDPE) layer 11b] /
[Low density polyethylene (LDPE) layer 12a / High density polyethylene (HDPE) layer 12b / Low density polyethylene (LDPE) layer 12c] / [Low density polyethylene (LD
PE) layer 13a / high-density polyethylene (HDPE) layer 1
3b / low density polyethylene (LDPE) layer 13c], the outermost layer is formed of high density polyethylene (HDPE), and the innermost layer is formed of low density polyethylene (LDPE).

Here, the outermost layer is made of high-density polyethylene (H
DPE) is made of high-density polyethylene (H
DPE) is superior in heat resistance and mechanical strength to low density polyethylene (LDPE), is not affected by heat during heat sealing, is hard to expand, and is difficult to open holes. The reason why (LDPE) is used is to secure the heat sealing property.

Each of the coextruded films 11, 12, 13
Are co-extruded films sealed on all sides and are not laminated on the whole surface of each co-extruded film. Therefore, slippage occurs between the opposing layers (facing layers) between the coextruded films, but the opposing layers between the coextruded films are all low-density polyethylene (LDPE) layers. Good slip,
From the viewpoint of distribution, a favorable buffering effect is achieved.

The bag body 1 having such a structure is provided with an injection spout 2 composed of a spout 21 made of low density polyethylene (LDPE) and a cap 22 made of high density polyethylene (HDPE).

More specifically, a low-density polyethylene (LDPE) layer 13c constituting the innermost layer of the bag body 1 and a spout 21 made of low-density polyethylene (LDPE) are heat-sealed, and a screw cap 22 is attached to the spout 21. Is attached. 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. Note that the configuration of the bag body 1 is not limited to the illustrated one. For example, [the high-density polyethylene (HDPE) layer (thickness: 30 to 50 μm) / the low-density polyethylene (LDPE) layer (thickness) 70-120μ
m)] + Low density polyethylene (LDPE) film (40-80 μm thickness) + Low density polyethylene (LDPE)
A triple bag made of a film (thickness of 40 to 80 μm), [High-density polyethylene (HDPE) layer (thickness of 30 to 50 μm)
m) / Low density polyethylene (LDPE) layer (thickness 70 ~
120 μm)] + [Low density polyethylene (LDPE) layer (thickness: 20 to 40 μm) / high density polyethylene (HDP)
E) a double bag consisting of a layer (thickness of 20 to 40 μm) / low density polyethylene (LDPE) layer (thickness of 20 to 40 μm) or a high density polyethylene (HDPE) layer (thickness of 30 to 50 μm) / low High density polyethylene (LDPE)
Layer (thickness 70 to 120 μm)] + [low density polyethylene (LDPE) layer (thickness 20 to 40 μm) / high density polyethylene (HDPE) layer (thickness 20 to 40 μm) / low density polyethylene (LDPE) layer (thickness) 20-40 μm)]
+ [Low density polyethylene (LDPE) layer (thickness 20 to 4)
0 μm) / high density polyethylene (HDPE) layer (thickness 2
0-40 μm) / Low density polyethylene (LDPE) layer (thickness 20-40 μm)] + [low density polyethylene (L
DPE) layer (20 to 40 μm in thickness) / high-density polyethylene (HDPE) layer (20 to 40 μm in thickness) / low-density polyethylene (LDPE) layer (20 to 40 μm in thickness). Is also good.

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

Next, a second embodiment of the present invention will be described. The second embodiment is an improvement of the first embodiment. FIG. 3 is an explanatory view showing a bag for a milk bag-in-box according to the second embodiment of the present invention.

As shown in FIG. 3, the bag 1 for a dairy bag-in-box according to the second embodiment has a four-side seal portion 3.
Are further overlapped by a four-sided seal. Here, the outer four-side seal portion 3 has a seal strength of 4 to 5 k.
g / 15 mm wide seal (seal in a state where the resin film is completely melted), and the inner four-side seal portion 4 has a seal strength of 2-3 kg / 15 mm width so that the seal surface peels off. Is preferred. By forming the inner four-side seal portion 4 as a seal that causes peeling of the sealing surface, the impact from the internal liquid can be absorbed by the peeling of the sealing surface. Assuming that the inner four-side seal portion 4 is a complete seal, the inner four-side seal portion 4
The bag may be torn along the inner edge (inner line) 4a.

Air or the like can be interposed between the outer four-side seal portion 3 and the inner four-side seal portion 4. This improves cushioning.
The space between the outer four-side seal portion 3 and the inner four-side seal portion 4, the seal width of each of the four-side seal portions, the seal strength, and the like are appropriately changed in design.

The other structure of the bag for a milk bag in box according to the second embodiment is the same as that of the bag for a milk bag in box of the present invention described above. When an external impact is applied to the dairy bag-in-box bag according to the second embodiment having the above configuration, the external impact is transmitted to the liquid inside the bag, and the impact from the internal liquid is transmitted to the sealing portion. . In this case, the four-side seal portion 4 located inside serves as a shock absorbing member and absorbs the impact from the internal liquid, so that the seal portion 3 located outside is less likely to be broken.
Also, even if the four-side seal portion 4 located inside is torn, milk and the like do not leak to the outside because there is the seal portion 3 located outside.

As shown in FIG. 4, the milk bag-in-box bag according to the second embodiment is obtained by partially overlapping the inside of the outer four-side seal portion 3 with the seal 5. It may be. This is because although the bag 1 for a dairy bag-in-box is used by being put in a cardboard box, it does not receive much impact on the corners, but impacts on the other parts of the four-sided seal except for the corners. As shown in FIG. 7, the inside of the four-side seal portion 3 is partially sealed 5 along the four-side seal portion 3 to absorb the impact applied to portions other than the corners of the four-side seal portion.

[0035]

According to the present invention, milk having sufficient safety and strength as a container for raw milk, cow's milk, processed milk, etc., and having favorable properties in distribution such as a buffering effect, etc. A bag for a bag-in-box is provided.

[Brief description of the drawings]

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

FIG. 2 is an explanatory view showing a configuration example of a bag body constituting the bag-in-box bag body of the present invention.

FIG. 3 is an explanatory view showing a second embodiment of the bag-in-box bag of the present invention.

FIG. 4 is an explanatory view showing another mode of the second embodiment of the bag for a bag-in-box according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bag main body 2 ... Injection pouring tool 3 ... Outer four-side seal part 4 ... Inner four-side seal part 11 ... Co-extruded film 11a ... High-density polyethylene (HDPE) layer 11b ... Low-density polyethylene (LDPE) layer 12 ... Co-extrusion Film 13: Co-extruded film 21: Spout 22: Cap

Claims (5)

(57) [Claims] 1. A bag for a bag-in-box comprising a bag body made of a polyethylene (PE) film, and an injection spout attached to the bag body, wherein the bag body is made of high-density polyethylene (HDPE). And low density
Polyethylene (LDPE)
Lumber only, weight without adhesion between each co-extruded film
The co-extruded film group obtained by joining
It is formed by overlapping
The outermost layer of the film group is formed by the HDPE layer,
The facing layers between the exposed films are each formed by an LDPE layer
And the innermost layer of the co-extruded film group is formed by the LDPE layer.
The spout made of LDPE , wherein the pouring spout is heat-sealed to the inner surface of the bag body, and an H attached to the spout.
A dairy bag-in-box bag, comprising a DPE cap. 2. The dairy bag-in-box according to claim 1.
The coextrusion film group comprises three coextrusion films.
The film is laminated and the outer co-extruded film is
Outermost HDPE layer and LDPE from outside to inside
Consists of two layers, the middle co-extruded film is on the outside
LDPE layer, HDPE layer and LDPE
Consists of a three-layer structure, with the inner co-extruded film on the outer side
From the LDPE layer, HDPE layer and innermost layer
Claims characterized by comprising a three-layer structure with an LDPE layer
Item 2. A bag for a milk bag-in-box according to Item 1. 3. A polyethylene (PE) film
It has a bag body and an injection spout attached to the bag body.
A bag body for a bag-in-box, wherein the bag body is made of high-density polyethylene (HDPE) and low density.
Less coextruded film with polyethylene (LDPE)
Two or more polyethylene (PE) fills, including at least one
Is formed by overlapping four-sided seals
In both cases, the outermost layer is formed by the HDPE layer of the co-extruded film.
Formed and the injection spout is thermally fused to the inner surface of the bag body.
LDPE spout and H attached to the spout
It consists of a DPE cap, and the inside of the four-side seal part is further overlapped with a four-side seal.
Milk bag-in-box bag characterized by having
body. 4. A film comprising a polyethylene (PE) film
It has a bag body and an injection spout attached to the bag body.
A bag body for a bag-in-box, wherein the bag body is made of high-density polyethylene (HDPE) and low density.
Less coextruded film with polyethylene (LDPE)
Two or more polyethylene (PE) fills, including at least one
Is formed by overlapping four-sided seals
In both cases, the outermost layer is formed by the HDPE layer of the co-extruded film.
Formed and the injection spout is thermally fused to the inner surface of the bag body.
LDPE spout and H attached to the spout
It consists of a DPE cap, and the inside of the four-sided seal part is partially overlapped with a seal
A bag for a milk bag-in-box, characterized in that: 5. A milk bag-in according to claim 3 or 4.
In a box bag, it consists of HDPE and LDPE
Bonding multiple co-extruded films between each co-extruded film
Coextrusion film group obtained by superimposing without
While being formed by being overlapped by a seal,
The outermost layer of this co-extruded film group is formed by HDPE layer
And the facing layer between each co-extruded film is LDPE
The innermost layer of the group of co-extruded films is LDP
4. The method according to claim 3, wherein the layer is formed by an E layer.
Or a bag for a dairy bag-in-box according to item 4.