JP2955226B2 - Manufacturing method of aluminum pouch for food - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to relates to a method of manufacturing a food aluminum pouch <br/>, relates to a method for producing a suitable inexpensive food grade aluminum pouch particular as a packaging material for foods hate the smell.

[0002]

BACKGROUND OF THE INVENTION Problems to be Solved by the Invention
2. Description of the Related Art A packaging material called an aluminum pouch has conventionally been used for packaging foods and the like that do not like the smell of baking and the like. For example, as shown in FIG. 2, the packaging material includes a support material 1, a first anchor coat layer 2, a polyethylene layer 3, an aluminum foil layer 4, a second anchor coat layer 5, and a sealant layer 6. The sealant layer 6 has a two-layer structure of a first polyethylene layer 61 and a second polyethylene layer 62. The first polyethylene layer 61 of the sealant layer 6 is coated on the surface of the second anchor coat layer 5 at a normal processing temperature, and then the second polyethylene layer 62 is formed on the laminated surface of the polyethylene layer 61 by low-temperature extrusion. Is formed. This is because the lamination temperature of the first polyethylene layer 61 is relatively high, so that an odor peculiar to polyethylene is generated. In order to prevent this, it is necessary to form the second polyethylene layer 62.

However, this aluminum pouch requires a large number of steps since the sealant layer is formed of two coats, so that the cost is high. Further, the aluminum pouch has a thin sealant layer (for example, 30 μm).
m or less), which has the problem that the resin cost is high.

[0004] In such an aluminum pouch ,
As the anchor coating agent for forming the second anchor coating layer 5, general-purpose anchor coating agents such as resin-based anchor coating agents such as polyethyleneimine, polyurethane, and polyester, and titanate-based anchor coating agents are used.

Accordingly, it is an object of the present invention to provide a method for efficiently producing an inexpensive packaging material having no oxidation odor of polyethylene.

[0006]

As a result of intensive studies in view of the above-mentioned objects, the present inventors have used polyolefin-based anchor coating agents to be applied to an aluminum foil layer and used low-density polyethylene or linear low-density Polyethy
By directly laminating the sealant layer made of ren ,
The present inventors have found that a low-odor aluminum pouch can be obtained so as to be suitable for food use, and reached the present invention.

That is, the method for producing a low-odor packaging material of the present invention comprises applying an anchor coat agent having a dry weight of 0.1 to 2.0 g / m ² by applying and drying a polyolefin-based anchor coat agent on a barrier layer made of aluminum foil. Forming
Then, on the anchor coat layer, a low-density polyethylene or
Is characterized in that a sealant layer is directly laminated by extrusion coating linear low-density polyethylene at a melting temperature of 300 ° C. or less.

[0008]

According to the present invention, an aluminum foil layer and a sealant layer are directly laminated with a polyolefin-based anchor coat layer. Use a polyolefin-based anchor coating agent as the anchor coat layer and a low-density polymer as the sealant layer.
Since ethylene or linear low-density polyethylene is used, both layers have good affinity. Therefore, low-density polyethylene or linear low-density polyethylene forming the sealant layer
Even if the extrusion temperature of styrene is lowered, the adhesiveness is improved.

Based on these properties, the present invention provides a low-density polyethylene or linear low- temperature polyethylene at a melting temperature of 300 ° C. or lower.
Extrusion coating of high density polyethylene forms a sealant layer. For this reason, low density forming the sealant layer
Since low-density polyethylene or linear low-density polyethylene is not oxidized, low odor is achieved. In addition, since the sealant layer is a single layer, the number of steps for manufacturing an aluminum pouch can be reduced, the thickness of the sealant layer can be reduced, and the resin cost can be reduced.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS [1] Structure of Aluminum Pouch FIG. 1 is a sectional view showing the structure of an aluminum pouch according to one embodiment of the present invention. The aluminum pouch of the present invention has an aluminum foil layer 4, a second anchor coat layer 5, and a sealant layer 6 as essential components, and if necessary, a support material 1, a first anchor coat layer 2, a polyolefin And a layer 3.

(1) Aluminum foil layer For the aluminum foil layer 4, a general-purpose soft aluminum foil can be used. 6 ~ 15μ for aluminum foil
A thickness of about m is used. If the thickness is less than 6 μm, the gas barrier properties and strength are insufficient, and a thickness exceeding 15 μm is meaningless.

(2) Second Anchor Coat Layer In the present invention, the anchor coat agent for forming the second anchor coat layer 5 is to improve the adhesion to the sealant layer 6 formed by low-temperature extrusion. , A polyolefin-based anchor coating agent is used. Especially Ann
A polyolefin of the same type as the car coating agent and the sealant layer 6
By using polyethylene, particularly as described later, the adhesiveness of the sealant layer 6 can be further improved.
As such a polyolefin-based anchor coating agent,
An ethylene-vinyl acetate copolymer, an ethylene-acrylic acid copolymer, an ethylene-methacrylic acid copolymer, or a maleic anhydride copolymer or a grafted product thereof can be used.

The coating amount of the polyolefin-based anchor coating agent is 0.1 to 2.0 g / m ² by dry weight, and if the coating amount of the anchor coating agent is less than 0.1 g / m ² , the aluminum foil layer 4 and the sealant layer 6 Lacks the power to bond with
Further, if it exceeds 2.0 g / m ² , no improvement in the adhesive strength corresponding thereto is obtained, and it is meaningless.

(3) Sealant layer In the present invention, a low-density polyethylene
Or linear low-density polyethylene. The sealant layer 6 is made of low-density polyethylene or linear low-density polyethylene at a melt extrusion temperature of 300 DEG C. or less, preferably from 270 to 290.
It is formed by extrusion coating at a melt extrusion temperature of ° C. When the melt extrusion temperature of low-density polyethylene or linear low-density polyethylene exceeds 300 ° C, low-density polyethylene
Oxidation of the low-density polyethylene or linear low-density polyethylene begins, causing odor.

The thickness of the sealant layer 6 is 15 to 60 μm. If the thickness is less than 15 μm, the sealing effect of the sealant layer is not sufficient, and if it exceeds 60 μm, no further improvement in the sealing effect can be obtained. In particular, in the present invention, the conventional 2
It is possible to make the sealant layer thinner (about 30 μm or less), which was impossible with the sealant layer of the layer coat.

(4) Support The support 1 that can be used in the present invention is not particularly limited in its material, and is variously selected depending on the use of packaging. For example, biaxially oriented polyester, biaxially oriented polyester In addition to films such as polyamide and biaxially oriented polypropylene, cellophane, paper, and the like can be used. The thickness of the support 1 can be variously changed depending on the use of the packaging, but generally, about 10 to 100 μm is sufficient.

(5) First anchor coat layer When the first anchor coat layer 2 is provided, the anchor coat agent may be a resin-based anchor coat agent such as polyethyleneimine, polyester or polyurethane, or a titanate-based anchor coat agent. And other general-purpose ones can be used. The coating amount of the anchor coat agent is based on the dry weight.
Preferably 0.1 ~2.0 g / m ^2, the coating amount of the anchor coating agent is insufficient adhesive strength between the support member 1 and the polyethylene layer 2 is less than 0.1 g / m ^2, also exceed 2.0 g / m ² However, further improvement in adhesive strength cannot be obtained, and it is not economical.

(6) Polyolefin Layer Polyethylene, particularly low-density polyethylene or linear low-density polyethylene, is preferably used for the polyolefin layer 3 in the same manner as the sealant layer 6, and particularly, a low melt index (MI) of 2 to 10 is used. High density polyethylene or linear low density polyethylene is preferred. The thickness of the polyolefin layer 3 is
When the thickness is less than 10 μm, it is difficult to form a film at the time of extrusion coating.
There is no point in exceeding.

[2] Manufacturing method of aluminum pouch A manufacturing method of an aluminum pouch having the structure shown in FIG. 1 will be described as an example. First, an anchor coating agent is applied to the support material 1 to form a first anchor coat layer 2, followed by extrusion lamination of this and the aluminum foil layer 4 with polyethylene to form a support material 1 and an anchor coat layer 2. And a polyolefin (polyethylene) layer 3;
A laminate including the aluminum foil layer 4 is formed.

Next, an olefin-based anchor coat agent is applied to the surface of the aluminum foil layer 4 of the laminate thus formed to form a second anchor coat layer 5. And on top of that, low density polyethylene or linear low density
The polyethylene is subjected to extrusion coating under the above conditions to form a sealant layer . In the present invention, since the anchor coating agent of the second anchor coat layer 5 for bonding the sealant layer 6 and the aluminum foil layer 4 is made of polyolefin, even if the extrusion coating is performed at a melting temperature of 300 ° C. or less, the sealant layer 6 and the aluminum foil layer 4 adhere well.

[0021] In the above, the second anchor coat layer 5 is formed on the surface of the aluminum foil layer 4 and then a low-density po
It is essential to stacking Riechiren or sealant layer 6 formed of linear low density polyethylene directly, the anchor coat layer 2 on the support member 1, and the polyolefin layer 3, in particular a method for forming an aluminum foil layer 4 Not limited.

As described above, since the sealant layer 6 is extrusion-coated at a low melting temperature, the oxidation odor of polyethylene does not occur. Further, since the sealant layer 6 has a single-layer structure, the number of manufacturing steps of the aluminum pouch can be reduced.

[0023]

The present invention will be described in more detail with reference to the following specific examples. Example 1 and Comparative Example 1 Cellophane 300 having a thickness of 20 μm (Nimura Chemical Co., Ltd.) as a support material
And an imine anchor coating agent (Epomin P-1000, manufactured by Nippon Shokubai Chemical Co., Ltd.) with a dry weight of 1.
0 g / m ² , followed by this and a thickness of 7
15 μm of soft aluminum foil (manufactured by Tokai Metal Co., Ltd.)
μm low density polyethylene (Mitsui Nisseki Polymer Co., Ltd.)
M-11P) to form a laminate comprising a support, a first anchor coat layer, a polyethylene layer and an aluminum foil layer. The melting temperature of the low density polyethylene during extrusion lamination was 320 ° C.

Next, an olefin-based anchor coating agent (AC-300, manufactured by Dainippon Ink and Chemicals, Inc.) is applied to the aluminum foil surface of the laminate thus formed, and a low-density polyethylene (Mitsui Nisseki Polymer Co., Ltd.) is applied. M-11P) was extrusion coated to a thickness of 30 μm at a melting temperature of 285 ° C ,
An aluminum pouch (Example 1) was formed by processing into a small bag .

For comparison, a conventional imine-based anchor coating agent was applied to the aluminum foil surface of the laminate obtained in Example 1, and low-density polyethylene was extruded to a thickness of 30 μm at a melting temperature of 320 ° C. A packaging material was obtained by a lution coating. The packaging material thus obtained was processed into a small bag shape in the same manner as in Example 1 to obtain an aluminum pouch (Comparative Example 1).

The aluminum pouch thus obtained was tested for adhesion and odor (oxidation odor of polyethylene). The adhesiveness was evaluated by the heat sealing strength when the surfaces of the aluminum pouches were heat-sealed at 140 ° C. and 1 kg / cm ² for 1 second. As an odor test, put pure water in an aluminum pouch, store at 50 ° C for 7 days,
Thereafter, the taste of the water was evaluated. The results are shown in Table 1.

Table 1 Example No. Adhesive odor Example 1 Good None Comparative Example 1 Good Notable

As apparent from Table 1, the aluminum pouch of Example 1 had good adhesiveness and no odor such as oxidation odor of polyethylene. On the other hand, Comparative Example 1
In the aluminum pouch, the oxidation odor of polyethylene was transferred to the water after storage.

[0029]

According to the present invention as described above, according to the present invention, with use of those polyolefin as an anchor coating agent to be applied to an aluminum foil layer, low density polyethylene also
Since the sealant layer made of linear low-density polyethylene is directly laminated, the adhesiveness is good even when the extrusion processing temperature is lowered. Therefore, single-layer lamination of the polyolefin layer by low-temperature extrusion coating becomes possible. As a result, a low-priced aluminum pouch is realized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a layer structure of a low-odor packaging material for an aluminum pouch according to one embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a layer configuration of a conventional low-odor packaging material for aluminum pouches .

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Support body 2 ... 1st anchor coat layer 3 ... Polyolefin layer 4 ... Aluminum foil 5 ... 2nd anchor coat layer 6 ... Sealant layer

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI B32B 15/20 B32B 15/20 27/32 27/32 Z B65D 65/40 B65D 65/40 A (56) References JP 57-157724 (JP, A) JP-B 60-15463 (JP, B2) (58) Fields investigated (Int. Cl. ⁶ , DB name) B32B 15/08 103 A23L 3/00 101 B05D 7/14 101 B05D 7/24 301 B05D 7/24 302 B32B 27/32 B65D 65/40

Claims (3)

(57) [Claims] 1. A method of manufacturing an aluminum pouch for food, wherein an anchor coat layer having a dry weight of 0.1 to 2.0 g / m ² is formed by applying and drying a polyolefin-based anchor coat agent on a barrier layer made of aluminum foil;
Then, on the anchor coat layer, a low-density polyethylene or
Is a method for producing an aluminum pouch for food , wherein a sealant layer is directly laminated by extrusion coating linear low density polyethylene at a melting temperature of 300 ° C. or less. 2. The method for producing an aluminum pouch for food according to claim 1, wherein a polyolefin layer and the aluminum foil are laminated on a support material layer, and then the anchor coat layer and the sealant layer are formed on the aluminum foil. And a method for producing an aluminum pouch for food . 3. The aluminum package for food according to claim 1 or 2.
The method of manufacturing a Uchi method for food aluminum pouch, characterized in that providing an anchor coat layer between the support and the polyolefin layer.