JPS6322369A - Bag-in box containing aluminum foil - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides an aluminum foil-containing reversible bag in which an inner bag made of a laminated film with aluminum foil used as an intermediate layer is housed in a box. Concerning the improvement of Guinbo Sox.

(Prior Art) As a one-way container for transporting liquids, a so-called bag-in-box is used, in which a cardboard box is used as the exterior and a synthetic resin bag such as plastic is used as the inner bag. This bag-in-box is a rational container that combines the water resistance, oil resistance, chemical resistance, gas barrier properties, etc. of synthetic resin with the rigidity necessary for storage and transportation of paper cartons and cardboard boxes. Compared to liquid containers such as metal cans and glass bottles, they are lighter and more difficult to break, which helps reduce distribution costs and labor.

Incidentally, from the viewpoint of improving gas barrier properties, an aluminum foil bag-in-box using aluminum foil as an intermediate layer has been proposed.

(Problem to be solved by the invention) However, the above-mentioned bag-in-box containing aluminum foil has extremely high rigidity, and pinholes occur frequently around the bends, so the reality is that it is hardly ever put into practical use. be.

However, depending on the contents, there are strong requirements for maintaining gas barrier properties and flavor properties, and it is true that bag-in-boxes containing aluminum foil must be used to meet these requirements.

The present invention has been made in view of the above circumstances, and its purpose is to prevent the occurrence of pinholes and provide a high gas barrier.
To provide a bag-in-box containing aluminum foil that maintains its properties and is sufficiently durable for practical use.

(Means for Solving the Problems) In order to achieve the above object, the present invention stores an inner bag made of a laminated film having a laminate structure of at least three layers: an outer layer, an intermediate layer, and an inner layer in a box body. In a bag-in-box containing aluminum foil, the outer layer is a biaxially stretched 6-nylon film, the middle layer is aluminum foil, and the inner layer is a linear low-density polyethylene film, an ethylene-vinyl acetate copolymer film, and a low-density The box is made of polyethylene film, and the bright side and inner layer of the aluminum foil and the cloak side and outer layer of the aluminum foil are bonded and integrated with urethane adhesive, and the dimensions of the box body are adjusted to the inside of the inner bag. It was determined to satisfy a predetermined relational expression for the dimensions.

(Function) As a result, the adhesive strength between the rough aluminum foil cloak surface and the outer layer is strengthened, and if the inner bag made of such a laminated film is housed in a box of specified dimensions, the inner bag Experiments have demonstrated that the occurrence of pinholes in the bag is prevented and that the bag-in-box containing aluminum foil is sufficiently durable for practical use.

(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

FIG. 1 is a partially cutaway perspective view of a bag-in-box containing aluminum foil according to the present invention, and FIG. 2 is a cut-away sectional view showing the structure of the inner bag film of the bag-in-box.

The bag-in-box 1 containing aluminum foil shown in FIG.
The inner bag 3 is filled with liquid such as juice.

The structure of the laminated film is shown in FIG. 2, and the laminated film has a laminated structure of an inner layer N4, an intermediate layer 5, and an outer layer N6. The inner layer 4 is a 25μ thick biaxially stretched 6-nylon film with high pinhole resistance and adhesive properties, and the intermediate layer 5 is a 7μ thick aluminum foil.
As the outer layer 6, a linear low-density polyethylene film, an ethylene-vinyl acetate copolymer film, or a low-density polyethylene film each having a thickness of 90 μm is employed.

Therefore, the nylon film constituting the inner layer 4, the ply surface 5a of the aluminum foil constituting the intermediate layer 5, the cloak surface 5b of the aluminum foil, and the linear low density polyethylene film constituting the outer layer 6 are bonded, respectively. They are bonded together with adhesive 7.7. In addition, as this adhesive 7.7,
A soft urethane adhesive having a molecule ff of 120.000 or less per 10 carbon atoms and a functional group number of 5 or more is used. or,
The adhesive surfaces of the nylon film constituting the inner layer 4 and the linear low-density polyethylene film constituting the outer layer 6 are plier-coated surfaces (surfaces coated with polyurethane resin) to increase adhesive strength. . Further, as the nylon film constituting the inner layer 4, it is desirable to use nylon blended with an elastomer (nylon polymer) and having high pinhole resistance.

Therefore, by using the box body 2 having dimensions that satisfy a specific relational expression for the predetermined dimensions of the inner bag 3, the degree of bending of the inner bag 3 and the vibration of the bent portion can be extremely suppressed. ,
Moreover, the occurrence of pinholes can be prevented. Although it is generally better to make the clearance between the box body 2 and the inner bag 3 smaller, it is not always better. This is because even if the clearance is small, pinholes may occur due to the way the inner bag 3 is bent or the effects of vibration.Also, from the standpoint of workability, if the clearance is too small, the inner bag 3 may be This is because problems arise such as it being difficult to put into the container or the contents overflowing.

Here, the relational expression that the dimensions of the box 2 (width B x length C x height H) should satisfy is shown below. In addition, the inner dimensions of inner bag 3 are a”x
b''''' and the internal volume is AA.

l) In case of flat bag box B x C x H = (0.49a ± 0.08a)”
0,45a + A) ±0.08a) 111IX ((
0.47b+2A)±0.08b)″”・(112)
For gusset box B x Cx H = (0,96a:!: 0.08
a)”X ((0,91a+2A)±0.08a)”
X (0,51b±0.08b)lI11'...
(2) However, each size B, C, and H of the box body 2 falls within the range of the above formula, and the value obtained by multiplying the numerical values of the variations in each size B, C, and H, respectively, is ±1. 25XIO-
'It is necessary that it does not exceed '.

The material for the box body 2 is preferably a liner, and the overall basis weight (weight) is 910 g/n? It is desirable that the

Next, three types of laminate configurations were selected as the laminated film for the inner bag 3, and a vibration experiment was conducted on each inner bag 3 to examine the incidence of pinholes.The results are shown below. In addition, the vibration conditions are 1G (total amplitude 7 dragons, frequency 500 times),
Vertical vibration for 5 hours and horizontal vibration for 5 hours were employed at a temperature of 5 to 14°C.

<Experimental example 1> Dimensions that satisfy the above formula (1) BxCxH = 245'・X
Dimensions aXb-5401 inside the box 2 of 245"X340-
``11 x 6201'' flat inner bag 3 (A=201)
The table below shows the results of the experiment.

Table 1 In addition, in the above table, from the outer layer to the inner layer, 25 μNy is the thickness of 2.
5μ biaxially stretched 6-nylon film, 7μAI is 7μ thick aluminum foil, 90μL LDPE is 90μ thick linear low density polyethylene film, EVA is ethylene-vinyl acetate copolymer film, LDPE is low density Each shows a polyethylene film.

According to this experiment, if the inner bag 3 is made using the laminated film shown in the table and the dimensions of the box body 2 satisfy formula (1), the occurrence of pinholes can be completely prevented. This proves that the aluminum foil-containing Rivasoguinbosoku is sufficiently durable for practical use.

<Experimental Example 2> Using a film with the same laminated structure as Experimental Example 1, axb
= 270" x 5401111 (A = 20j) Make an inner bag for the gusset, put it in a box with dimensions BXCXH = 285" x 2651 x 270" that satisfies the formula (2) above, and conduct under the same conditions as in Experimental Example 1. The results of the vibration experiment are shown in the table below.

In this experiment, as in Experimental Example 1, the occurrence of pinholes could be completely prevented.

Experimental Example 3> The inner bags made in Experimental Example 1 and Experimental Example 2 were each made into BxC.
xH=225ffillx295"X340"(for gloves, A=20p), 300"x310'"1x270"(
The table below shows the results of a vibration experiment conducted in a box with dimensions A=2OA) for gussets. Incidentally, none of the above-mentioned dimensions BXCXH of the box body satisfy the above-mentioned formula (1)2 or (2).

Table 3 According to this experimental example, even if the inner bag is made of a film with a predetermined laminate structure, if the dimensions of the box body do not satisfy the above (Equation 11 or Equation (2)), pinholes cannot be prevented. It turns out that it has no effect.

(Effects of the Invention) As is clear from the above description, according to the present invention, the inner bag is made of a laminated film made of a predetermined material, and the inner bag is housed in a box of predetermined dimensions. , the occurrence of pinholes in the inner bag can be prevented, and the bag-in-box containing aluminum foil can be made sufficiently durable for practical use.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a bag-in-box containing aluminum foil according to the present invention, and FIG. 2 is a cut-away sectional view showing the structure of the inner bag film of the bag-in-box. Explanation of symbols

Claims (2)

[Claims] (1) In a bag-in-box containing aluminum foil, which is constructed by storing an inner bag made of a laminated film having a laminated structure of at least three layers, an outer layer, an intermediate layer, and an inner layer, in a box body, the outer layer is biaxially Stretched 6-nylon film, middle layer made of aluminum foil, inner layer made of linear low density polyethylene film, ethylene-vinyl acetate copolymer film,
The box is made of either low-density polyethylene film, and the bright surface and inner layer of the aluminum foil and the matte surface and outer layer of the aluminum foil are bonded and integrated with urethane adhesive, and the dimensions of the box body are adjusted to the inner bag. A bag-in-box containing aluminum foil, characterized in that the inner dimensions of the bag-in-box are determined to satisfy a predetermined relational expression. (2) The above-mentioned predetermined relational expression expresses the inner dimensions of the inner bag as a^m^m
×b^m^m, the inner volume is Al, and the dimensions of the box are (horizontal)
When B^m^m x (length) C^m^m x (height) H^m^m, the characteristic is that it is expressed by the following formula for the box for flat bags and the box for gussets. A bag-in-box containing aluminum foil according to claim 1. 1) Flat bag box B x C x H = (0.49a±0.08a) x ((0.4
5a+A)±0.08a)×((0.47b+2A)±
0.08b) 2) Gusset box B x C x H = (0.96a±0.08a) x ((0.9
1a+2A)±0.08a)×(0.51b±0.08
b)