JP2001096683A - Multilayered film and gusset bag with spout - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gusset bag with a spout having the same shape as one using a conventional multilayered film containing aluminum foil while using a multilayered film containing no aluminum foil and excellent in self-supporting properties, barrier properties, printing procesability and impact resistance. SOLUTION: A multilayered film is constituted of a first layer being a transparent vapor-deposited polyester film, a second layer being a nylon film bonded to the first layer by an adhesive and a third layer being a polyethylene film bonded to the second layer by an adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001] The present invention relates to a multilayer film and a gusset bag with a spout formed from the multilayer film and provided with a spout (a spout plug).

[0002]

2. Description of the Related Art Conventionally, as a liquid packaging container (bag) for jelly drinks and soft drinks, a spouted gusset bag made of a soft packaging material formed of a multilayer film and provided with a spout has been known.

As shown in FIG. 2, a polyester film 5 printed with a printing ink e has a first layer, an aluminum foil 6 has a second layer, and a nylon film 7 has a third layer.
Layer, the polyethylene film 8 as the fourth layer, the first layer and the second layer are bonded with the adhesive f with the printed surface of the first layer facing the second layer, and the second layer and the third layer are separated. With the adhesive g, the third layer and the fourth layer
Some layers are bonded with an adhesive h. Since the aluminum foil has a high barrier property and a shape retaining property, the spouted gusset bag formed by forming the multilayer film and providing the spout can obtain a high barrier property and stable self-supporting property. One example of such a spouted gusset bag is shown in FIG.

However, when aluminum foil is used for a multilayer film, the following problems typically occur in a gusset bag with a spout. First, it is difficult to separate trash. Second, the calories burned during incineration are high. Third
In addition, due to the concealment of the aluminum foil, the contents cannot be seen. Fourth, it cannot be hung on a metal detector.

[0005]

In order to solve the above problems, the replacement of aluminum foil with an EVOH (ethylene / vinyl alcohol copolymer) film has been performed. However, in this case, the independence of the gusset bag with the spout becomes extremely poor.

However, the pentagonal side portion 21 as shown in FIG. 3 is transformed into a triangular side portion 31 as shown in FIG. 4 to lower the center of gravity of the spouted gusset bag, thereby recovering the independence. Can do it. However, as compared with the seal portion 23 of FIG. 3, the seal portion 33 of FIG. 4 requires a large area, so that there is a problem that more multilayer film is consumed and the cost is increased in order to secure a predetermined internal capacity. Occurs.

[0007] The present invention has been made in view of the above problems, and while using a multilayer film containing no aluminum foil,
An object of the present invention is to provide a gusset bag with a spout having the same shape as that of a conventional multilayer film containing an aluminum foil and having excellent self-sustainability, barrier properties, printability, and impact resistance.

[0008]

In order to achieve the above object, the present invention firstly comprises bonding a first layer, which is a transparent vapor-deposited polyester film, to the first layer with an adhesive. A second layer of a nylon film;
A multilayer film comprising a layer and a third layer which is a polyethylene film adhered with an adhesive.

According to a second aspect of the present invention, there is provided the multilayer film according to the first aspect, wherein the transparent evaporated polyester film is printed on the surface on the nylon film side.

According to a third aspect of the present invention, the multilayer film is a two-component reactive adhesive.

According to a fourth aspect of the present invention, there is provided the multilayer film according to any one of the first to third aspects, wherein the thickness of the polyethylene film is 75 to 95 μm.

According to a fifth aspect of the present invention, there is provided a gusset bag with a spout, wherein the multilayer film according to any one of the first to fourth aspects is formed and a spout is provided.

[0013]

Embodiments of the present invention will be described below.

FIG. 1 shows a cross-sectional view of the multilayer film of the present invention. This multilayer film has a transparent deposited polyester film 1 printed with a printing ink a as a first layer, a nylon film 2 as a second layer, and a polyethylene film as a third layer. The first layer and the second layer are bonded to each other with an adhesive b, and the second layer and the third layer are bonded to each other with an adhesive c.

While the conventional multilayer film has a four-layer structure, the multilayer film of the present invention has a three-layer structure.
This is for softening the stiffness of the multilayer film and increasing the self-sustainability of the spouted gusset bag of the present invention.

The first layer of transparent vapor-deposited polyester film is a transparent polyester film on which alumina, silica or the like is vapor-deposited, and has both high barrier properties and printability. The nylon film of the second layer is for maintaining strength. The polyethylene film of the third layer is for maintaining heat sealing properties and strength.

As the adhesive, a two-component reactive adhesive may be used.

As can be understood from the results of the examples described later, in order to soften the rigidity of the multilayer film and to maintain the heat sealing property and strength required for the multilayer film, the thickness of the polyethylene film of the third layer is required. Is preferably 75 to 95 μm.

The gusset bag with a spout of the present invention is characterized in that a spout is provided by forming the multilayer film of the present invention, and the shape thereof is not particularly limited. Thus, a shape that can secure a predetermined internal capacity is preferable. Therefore, the gusset bag with a spout of the present invention is more preferably in the shape shown in FIG. 3 than in the shape shown in FIG.

[0020]

Embodiments of the present invention will be described below in detail.

In each of the examples and comparative examples, a gusset bag with a spout having a shape as shown in FIG. 3 was prepared, and its self-sustainability and strength were evaluated on a three-point scale.

<Example 1> The multilayer film used for the front and side portions is a transparent vapor-deposited PET in which the first layer has a thickness of 12 μm.
(Polyethylene terephthalate) film, the second layer is composed of a 15 μm thick NY (nylon) film, and the third layer is composed of a 90 μm thick LLDPE (linear low density polyethylene) film. Film. Here, GLAEH manufactured by Toppan Printing Co., Ltd. was used for the transparent vapor-deposited PET film.

<Embodiment 2> LL whose third layer is 80 μm thick
Same as Example 1 except that it is a DPE (linear low density polyethylene) film.

<Comparative Example 1> LL in which the third layer has a thickness of 70 μm
Same as Example 1 except that it is a DPE (linear low density polyethylene) film.

Comparative Example 2 The LLDPE (linear low density polyethylene) film having a thickness of 100 μm for the third layer of the multilayer film used for the front portion, and the LLDPE (thickness of 70 μm) for the third layer of the multilayer film for the side portion were used. Same as Example 1 except that the film is a linear low density polyethylene) film.

Comparative Example 3 The multilayer film used for the front part was a PET (polyethylene terephthalate) film having a first layer having a thickness of 12 μm, an AL (aluminum) foil having a second layer having a thickness of 9 μm, and a third layer having a thickness of 9 μm. This is a conventional multilayer film composed of a NY (nylon) film having a thickness of 15 μm and an LLDPE (linear low density polyethylene) film having a fourth layer having a thickness of 100 μm. On the other hand, the multilayer film used for the side portion is a PET (polyethylene terephthalate) film having a first layer of 12 μm, an AL (aluminum) foil having a thickness of 9 μm, and a NY (nylon) having a third layer having a thickness of 15 μm. 2) The film is a conventional multilayer film shown in FIG. 2 in which the fourth layer is composed of an LLDPE (linear low density polyethylene) film having a thickness of 70 μm.

Comparative Example 4 EV in which the second layer has a thickness of 15 μm
The same as Comparative Example 3 except that OH (ethylene / vinyl alcohol copolymer) was used.

Comparative Example 5 The same as Comparative Example 3 except that the second layer was a transparent vapor-deposited PET (polyethylene terephthalate) film having a thickness of 12 μm. Here, GLAE manufactured by Toppan Printing Co., Ltd.
H was used.

The evaluation results of Examples 1 and 2 and Comparative Examples 1 to 5 are shown in Table 1.

[0030]

[Table 1]

From Table 1, it can be seen that the gusseted bags with spouts of Examples 1 and 2 are good in both independence and strength, similarly to the gusseted bags with spouts using the conventional multilayer film containing aluminum foil of Comparative Example 1. It turns out that it is.

[0032]

As a result, the multilayer film of the present invention has
Despite not containing aluminum foil, even when molded into the same shape as a conventional spouted gusset bag made from a conventional multilayer film containing aluminum foil, the same high independence as the conventional spouted gusset bag and There is an effect that a gusset bag with a spout of the present invention having strength can be obtained.

Therefore, the spouted gusset bag of the present invention has a high self-supporting property and a high strength.
There are also the following effects compared to the conventional gusset bag with spout. First, trash can be easily separated. Second, the calories burned during incineration are reduced. Third, if the transparent layer is formed by printing only a part of the first layer of the transparent vapor-deposited polyester film or printing with a transparent printing ink, the contents can be seen. 4th
Can be placed on a metal detector.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a multilayer film of the present invention.

FIG. 2 is a cross-sectional view of a conventional multilayer film.

FIG. 3 is an external perspective view of an example of a gusset bag with a spout.

FIG. 4 is an external perspective view of one example of a gusset bag with a spout.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Transparent vapor-deposited polyester film 2 ... Nylon film 3 ... Polyethylene film 5 ... Polyester film 6 ... Aluminum foil 7 ... Nylon film 8 ... Polyethylene film 20 ... Spout 21 ... Side part 22 ... Front part 23 ... Seal part 30 ... Spout 31 ... Side part 32 ... Front part 33 ... Seal part a ... Printing ink b ... Adhesive c ... Adhesive e ... Printing ink f ... Adhesive g ... Adhesive h ... Adhesive

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) B65D 33/04 B65D 33/04 33/38 33/38

Claims (5)

[Claims] 1. A first material which is a transparent vapor-deposited polyester film.
A second layer, which is a nylon film bonded to the first layer with an adhesive, and a third layer, which is a polyethylene film bonded to the second layer with an adhesive. Multilayer film. 2. The multilayer film according to claim 1, wherein the surface of the transparent evaporated polyester film on the nylon film side is printed. 3. The multilayer film according to claim 1, wherein the adhesive is a two-component reactive adhesive. 4. The polyethylene film has a thickness of 75 to 9
4. The method according to claim 1, wherein the thickness is 5 [mu] m.
Item 8. The multilayer film according to item 1. 5. A gusset bag with a spout, wherein the multilayer film according to any one of claims 1 to 4 is formed and a spout is provided.