JP3157561B2 - Laminated resin bag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents deterioration of the contents of foods containing flavoring components such as juices and liquid soups, pharmaceuticals such as poultices and plasters, and has excellent heat sealability. It relates to a three- or four-side heat seal bag.

[0002]

2. Description of the Related Art Conventionally, as a packing material of this kind, a gas barrier material such as an aluminum foil or a polyamide is used as the innermost layer of a polyethylene or ethylene-vinyl acetate copolymer or ethylene / acrylic acid copolymer film as a base material. Laminated laminates are used. The laminated product is filled with the food and the drug, and three or four sides are heat-sealed by a die-roll type automatic filling / packing machine or a hot plate type automatic filling / packaging machine for testing.

[0003]

Disadvantages of the prior art Various additives are added to the innermost layer of the laminated film used for the bags of foods and medicines at the time of molding, and these additives are eluted, and the packaged contents are removed. Move to Further, there is a problem that the flavoring component of the contents is adsorbed to the ethylene-based resin and the contents are deteriorated.

If the gas barrier resin such as polyethylene terephthalate, nylon-6, nylon 6,6 or the like is used for the innermost layer of the packaging material in order to solve such problems, the above-mentioned problems can be solved. Melting point of 2
Since the heat sealing property is high at 38 to 282 ° C. and the heat sealing property is poor, the heat sealing temperature is high (248 to 30) in a general hot plate type heat sealing and an impulse sealing type sealing method.
0 ° C.), and the surface layer of the laminated film shrinks due to heat, resulting in poor appearance or extremely low packaging speed. Further, even if the sealing is performed at a high temperature, the sealing strength is insufficient (30 to 500 g / 15 mm width), so that practical use is difficult.

[0005] That is, when these bags are stacked in many stages for storage and transportation, there is a disadvantage that the heat seal portion of the bags is peeled off by the load applied to the bags.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to provide a packaging bag having a high heat-sealing strength, which prevents deterioration of contents to be stored and migration of flavor components to the packaging material.

[0007]

Specifically, a gas barrier resin having a thickness of 1 to 5 μm is used as an innermost layer, and this and the outermost base material are bonded via an ethylene resin adhesive layer having a thickness of 10 to 60 μm. A laminated material obtained by laminating, and a seal strength obtained by heat-sealing the laminated material in three or four directions with an automatic filling and packaging machine of a die roll system is 1,000 to 6.0.
The present invention provides a laminated resin bag having a width of 00 g / 15 mm.

Examples of the gas barrier resin film include polyethylene terephthalate resin, polybutylene terephthalate resin, glucose-modified polyethylene terephthalate resin, acid-modified polyethylene terephthalate resin, polyvinyl alcohol resin, nylon 6, nylon 6,6 and the like. Polyamide resin, polyvinylidene chloride resin, polyvinyl resin, polyvinyl acetate resin,
Polyacetal resin, polyacrylonitrile resin,
It is an ethylene-vinyl alcohol resin.

Among these, non-crystalline or low-crystalline
Polyethylene terephthalate resin, polybutylene tele
Phthalate resin, ethylene-vinyl alcohol resin
Is preferred. Ethylene-vinyl alcohol resin is ethyl
Those having a len content of 40 to 60 mol% are preferred. 40
If it is less than mol%, the temperature required for heat sealing will increase.
If it is not practical and exceeds 60 mol%,
The tendency to adsorb the flavor component of the container increases. This gasba
The rear resin is ASTM D3985 (20 ° C., relative
Under the condition of 65% humidity and 12 μm thickness)
100cc / m ^TwoSome are for 24 hours at atmospheric pressure.

[0010] The thickness of the gas barrier resin of the innermost layer (A) is 1 to 5 [mu] m, preferably 1 to 3 [mu] m. As the base material layer (C), a polyethylene terephthalate film, a polypropylene film, a polyamide film, BOPP, paper, aluminum foil, and the like can be used, and these are used alone or in a structure in which two or more kinds are laminated.

As the ethylene-based resin layer (B) of the adhesive layer, a resin having a lower melting point than the gas barrier resin of the innermost layer and having good heat sealing properties is used. Specifically, low density polyethylene, linear polyethylene, medium density polyethylene, high density polyethylene, ethylene 50
Examples thereof include an ethylene copolymer resin and an ionomer obtained by copolymerizing at least mol% of a monomer selected from vinyl acetate, acrylic acid, acrylic acid ester, methacrylic acid, methacrylic acid ester, and the like.

The thickness of the ethylene resin adhesive layer is 10 to 6
0 μm. In order to increase the adhesive strength between the innermost gas barrier resin layer (A) and the ethylene-based resin adhesive layer (B), as shown in FIG. The modified polyolefin resin layer (D) modified with an anhydride may be provided with a thickness of 1 to 10 μm.

As such modified polyolefin resin,
Maleic anhydride grafted ethylene / vinyl acetate copolymer, maleic anhydride grafted polyethylene, maleic anhydride polypropylene, acrylic acid grafted polyethylene, methacrylic acid grafted polyethylene and the like can be used. As a method for producing a laminate of the bag forming material, a known extrusion lamination method, a dry lamination method, or the like can be used alone or in combination.

The thickness of the laminate is 23 to 140 μm,
Preferably it is 60 to 100 μm. In order to form a three-side seal bag from the laminated resin film shown in FIG.
For example, using a known die-roll type automatic filling and packaging machine shown in FIG. 2, the laminated resin film 1 is formed such that the inner layer (A) side of the laminated resin film 1 is on the upper side and the base material (C) is on the lower side.
To the guide roll 2, the laminated resin film 1 is folded in two by the lead 3, the content is filled by a filling machine (not shown) between the two-folded laminated resin films, and folded in two by the vertical seal roll 4. Heat sealing is performed in the vertical direction at the left end of the laminated resin film.

Then, after the horizontal seal 6 has been filled with a certain amount of content, the content is heat-sealed with the horizontal seal roll 5 and the heat-seal portion 6 is cut with the knife 7 to fill the content. The manufactured three-side seal bag 8 is manufactured. A four-side sealed bag can be obtained by using a four-side sealed die-roll type automatic filling and packaging machine.

[0016]

The laminated resin bag of the present invention uses a gas barrier resin for the innermost layer of the laminated film in contact with the contents.
Adsorption of flavor components in the contents is prevented. Also, a laminated material in which the gas barrier resin layer as the innermost layer has a thickness of 1 to 5 μm , and the outermost layer of the base material is laminated with an ethylene resin having a thickness of 10 to 60 μm via an adhesive layer. Since this is heat-sealed on three sides or four sides by a die-roll type automatic filling and packaging machine, the heat seal strength of the bag is as high as 1,000 to 6,000 g / 15 mm wide, and a packaging bag with high pressure resistance can be obtained.

[0017]

The present invention will be described in more detail with reference to the following examples. Example 1 Biaxially stretched nylon-6 film / linear linear low density polyethylene (density 0.910 g / cm ³ , M
FR 10 g / 10 min) / Maleic anhydride grafted ethylene / vinyl acetate copolymer “Modic” (density 0.9
1 g / cm ³ , MFR 7 g / 10 min, Mitsubishi Yuka Co., Ltd.
(Trade name) / ethylene-vinyl alcohol copolymer resin (melting point: about 160 ° C., ethylene content: 47 mol%, EVAL EP-G110: trade name of Kuraray Co., Ltd.) 15 μm / 55 μm / 1
μm / 1 μm).

The laminated film was heat-sealed at 135 ° C. in a die-roll type automatic filling and packaging machine to form a three-sided sealed bag (80 m long) containing 20 ml of orange juice.
m, width 70 mm, seal width 5 mm). The three-sided sealed bag was left in an atmosphere of 40 ° C. for 20 days, then opened, smelled of orange juice, and evaluated as follows: (As a blank, 20 ml of orange juice had a volume of 3
It was stored in a 0 ml glass bottle and left at 40 ° C. for 20 days to perform the same evaluation. ) Aroma evaluation method of orange juice ○: Good aroma, having the same aroma component strength as the aroma component of orange juice stored in a glass bottle. X: The fragrance of limonene etc. was lost and the fragrance was weak. Table 1 shows the results.

[Example 2] In Example 1, a low-crystalline polyethylene terephthalate resin (PET G6763, PET G6763) was used in place of the ethylene-vinyl alcohol copolymer resin.
A bag was formed and evaluated in the same manner except that the product was changed to Eastman Kodak Co., Ltd.).

Example 3 The procedure of Example 1 was repeated except that the thickness of the ethylene-vinyl alcohol copolymer resin was changed to 5 μm.

Example 4 The procedure of Example 1 was repeated, except that the ethylene-vinyl alcohol copolymer resin was replaced by a polyacrylonitrile resin (Barex 2090, trade name of Mitsui Toatsu Chemicals, Inc.). Was.

Example 5 The same procedure was performed as in Example 1 except that the modified polyolefin resin was not used.

Comparative Example 1 A bag was formed and evaluated in the same manner as in Example 1 except that the heat seal was changed to a hot plate type heat sealer instead of the die roll method, and the conditions were as shown in Table 1. .

[Comparative Example 2] The same operation as in Example 2 was carried out except that the hot roll type heat sealer was used instead of the die roll type heat seal.

Comparative Example 3 The same procedure was performed as in Example 3 except that the heat seal of the die roll type was changed to a hot plate type heat sealer.

Comparative Example 4 The same operation was performed as in Example 4, except that the heat seal of the die roll type was changed to a hot plate type heat sealer.

Comparative Example 5 In Example 1, the thickness of the ethylene-vinyl alcohol copolymer resin was changed to 15 μm, and the sealing temperature was as shown in Table 1.
Except that the was carried out in the same manner.

Comparative Example 6 The same procedure as in Example 5 was carried out except that no ethylene-vinyl alcohol copolymer resin was used.

Table 1 shows the results of these evaluations.

[0030]

[Table 1]

[0031]

[Effect] A laminated product obtained by bonding and laminating a gas barrier resin having a thickness of 1 to 5 μm as an innermost layer, and a base material of the outermost layer via an ethylene resin adhesive layer having a thickness of 10 to 60 μm. The bag was heat-sealed in three or four directions by a die-roll type automatic filling and packaging machine. Even if the heat-sealing temperature was lower than the melting point of the gas barrier resin, the heat-sealing strength was 1,000 to 6 mm. , 00
It is as high as 0 g / 15 mm width.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a laminated film used to form a bag.

FIG. 2 is a flow chart showing a process of manufacturing a three-way heat seal bag using a die-roll type automatic filling and packaging machine.

[Explanation of symbols]

 A Inner Layer of Gas Barrier Resin B Ethylene Resin Adhesive Layer C Base Layer D Modified Polyolefin Layer 1 Laminated Film 2 Roll 3 Lead 4 Vertical Seal Roll (Metal) 5 Horizontal Seal Roll ( Metal) 6 Seal part 7 Knife 8 Three-way seal bag

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Keiichi Hatano 11-4 Gion-cho, Hakata-ku, Fukuoka, Fukuoka Prefecture Maruto Sangyo Co., Ltd. (56) References JP-A-3-76644 (JP, A) JP-A Sho JP-A-55-9612 (JP, A) JP-A-2-124955 (JP, A) JP-A-61-73752 (JP, A) JP-A-56-121764 (JP, A) A) JP-A-2-128676 (JP, A) JP-A-61-171329 (JP, A) JP-A-62-256643 (JP, A) JP-A-59-15023 (JP, A) (58) Survey Field (Int.Cl. ⁷ , DB name) B32B 1/00-35/00 B65D 30/00-30/28 B31B 1/00-1/98

Claims (1)

(57) [Claims] 1. A wall thickness to the 1~5μm gas barrier resin and the innermost layer, the thickness of this and the outermost layer of the substrate 10 to 60
A laminate material obtained by bonding and laminating via a μm ethylene-based resin adhesive layer, and a seal strength obtained by heat-sealing three or four sides with an automatic filling and packaging machine of a die roll system to obtain a seal strength of 1,000 to 6,000g / 15m
m width laminated resin bag.