CN2637378Y

CN2637378Y - Five layer coextrusion high interception package composite film

Info

Publication number: CN2637378Y
Application number: CN 03210214
Authority: CN
Inventors: 陈玉胜; 贺爱忠; 王虹; 徐莘
Original assignee: Shanghai Zijiang Colour Printing & Packaging Co Ltd
Current assignee: Shanghai Zijiang Colour Printing & Packaging Co Ltd
Priority date: 2003-09-01
Filing date: 2003-09-01
Publication date: 2004-09-01
Anticipated expiration: 2013-09-01

Abstract

The technic proposal of the utility model provides a five-layer coextrusion highly obstruct package complex film which is composed of a printing plus material layer, an adhesion layer, an aluminum foil, an adhesion layer and a heat sealing layer. One face of the adhesion layer is provided with the printing plus material layer, the other face of the adhesion layer is provided with the aluminum foil, the adhesion layer and the heat sealing layer. The utility model is characterized in that the other face of the adhesion layer is provided with an ethane-vinylol copolymer ( EVOH) five-layer coextrusion film besides the aluminum foil, the adhesion layer and the heat sealing layer. The utility model has the advantages of penetrability, few process procedures, small environmental pollution and good obstruct performance, which can be heated by microwave and is easy to be recycled and regenerated.

Description

Five-layer co-squeezing high-barrier packaging composite film

Technical field

The utility model relates to a kind of five-layer co-squeezing high-barrier packaging composite film that is used for commodity plastic compound flexible packagings such as microwave food, sauce based food, fruit drink, fruit jelly, oily food, spices, rare medicinal herbs, belongs to the plastic compound flexible packaging technical field.

Background technology

At present, traditional high-barrier packaging composite film is made up of the printing surface bed of material, adhesive layer, aluminium foil, adhesive layer, hot sealing layer usually, as shown in Figure 1, although barrier property is outstanding, but it is several all over bonding to need to adopt adhesion agent to carry out, and not only manufacturing procedure is many, cost is high but also environmental pollution is big.

As the aluminium foil that uses on traditional high-barrier packaging composite film, under the enough prerequisite of aluminum foil thickness, can intercept gas and moisture fully, but a fatal defective is arranged---crooked back aluminium foil is easy to produce fracture, influences the barrier property of aluminium foil.Simultaneously traditional high-barrier packaging composite film can't be applied to require transparent occasion, and can not microwave heating and plastic-aluminum combinedly be difficult to recycling together.

Summary of the invention

But the purpose of this utility model just provides a kind of transparency microwave heating, is convenient to reclaiming, the five-layer co-squeezing high-barrier packaging composite film that barrier property is good.

For reaching above purpose, the technical solution of the utility model provides a kind of five-layer co-squeezing high-barrier packaging composite film, form by the printing surface bed of material, adhesive layer, aluminium foil, adhesive layer, hot sealing layer, the one side of adhesive layer is equipped with the printing surface bed of material, another side is equipped with aluminium foil, adhesive layer, hot sealing layer, it is characterized in that, cast out aluminium foil, adhesive layer, hot sealing layer, be equipped with Ethylene vinyl alcohol copolymer EVOH five-layer co-squeezing film at the another side of adhesive layer.

Described ethylene-vinyl alcohol copolymer EVOH five-layer co-squeezing film, be made up of composite bed, bonding resin layer, EVOH resin bed, bonding resin layer, hot sealing layer, composite bed is that interlayer, bonding resin layer are internal layer for time interlayer, hot sealing layer for outer, bonding resin layer for time interlayer, EVOH resin bed.

Described composite bed can be that mono-also can mix for not containing or contain less LLDPE resin, the LDPE resin of opening agent and slip agent; Described hot sealing layer is metallocene LLDPE resin, LLDPE resin, LDPE resin, can be partially mixed, also can be whole mixing, but must contain metallocene LLDPE resin; Described EVOH resin bed is that ethylene contents is not more than 38% EVOH resin, and Thickness Design is 〉=20 μ.

In the combination of five-layer co-squeezing blown film, the EVOH resin is placed on interlayer, resin of binding property is placed on respectively near two of interlayer interlayers, with metallocene LLDPE resin, the LLDPE resin, the hot sealing layer of LDPE resin and blend thereof is placed on internal layer, to not contain or contain less the LLDPE resin of opening agent and slip agent, the composite bed of LDPE resin and blend thereof is placed on skin, can make EVOH five-layer co-squeezing film like this except having high oxygen resistance, one can make its heat cover have the antipollution heat sealability, and two can improve the combined strength bination of its composite surface and the printing surface bed of material.

Adopt raws MAT'L such as high barrier EVOH resin, binder resin, metallocene heat sealing resin on the five-layer co-squeezing membrane blowing production line, to make up blowing and form EVOH five-layer co-squeezing film, both had barrier property, again can be directly as antipollution heat sealability membraneous material, and has a transparency, owing to have the transparency, can be clear that the packing content thing, so that attract customer's desire to purchase; Its microwave heating is applied to the packing of fast food, has satisfied the fast rhythm of life demand of current city white collar.

But the utility model has the advantages that have transparency microwave heating, manufacturing procedure is few, environmental pollution is little, good, the easy reclaiming of barrier property.

Description of drawings:

Fig. 1 is traditional high-barrier packaging composite film structural representation;

Fig. 2 is a five-layer co-squeezing high-barrier packaging composite film structural representation;

Fig. 3 is an ethylene-vinyl alcohol copolymer EVOH five-layer co-squeezing membrane structure scheme drawing.

Specific embodiments

The utility model is described in further detail below in conjunction with drawings and Examples.

As shown in Figure 2, be a kind of five-layer co-squeezing high-barrier packaging composite film structural representation, form by the printing surface bed of material 1, adhesive layer 2, ethylene-vinyl alcohol copolymer EVOH five-layer co-squeezing film 6.

As shown in Figure 3, for ethylene-vinyl alcohol copolymer EVOH five-layer co-squeezing membrane structure scheme drawing, form by composite bed 7, bonding resin layer 8, EVOH resin bed 9, bonding resin layer 10, hot sealing layer 11.

According to the difference of packing content thing, the type selecting that can be adjusting of EVOH resin layer thickness and EVOH resin brand to the interlayer in the EVOH five-layer co-squeezing film is to reach different oxygen transit dose indexs.For example, EVOH co-extrusion film barrier layer thickness is designed to 〉=and 20 μ, select for use ethylene contents to be not more than 38% EVOH resin such as Japanese synthetic chemistry ET3803, the resistance oxygen value almost can compare favourably with the aluminum foil composite barrier property at 1.0～1.5ml/m2.24hr.23 ℃ below the .50%RH.

Five-layer co-squeezing high-barrier packaging composite film is made like this:

It is Japanese synthetic chemistry ET3803 that the material selection ethylene contents of EVOH resin bed 9 is not more than 38% EVOH resin, and Thickness Design is 〉=20 μ; Composite bed 7 is selected LLDPE resin, LDPE resin and the blend thereof that does not contain or contain less opening agent and slip agent for use; Hot sealing layer 11 is selected metallocene LLDPE resin, LLDPE resin, LDPE resin and blend thereof for use; Composite bed 7, bonding resin layer 8, EVOH resin bed 9, bonding resin layer 10, hot sealing layer 11 are finished EVOH five-layer co-squeezing film 6 on five-layer co-squeezing blown film line.

The offprint brush finish bed of material 1 material is NY or PET, the skins that on the printing surface bed of material 1, are coated with adhesive layer 2 back and EVOH five-layer co-squeezing film 6 be composite bed 7 sides on dry compound machine, finish composite task get final product five-layer co-squeezing high-barrier packaging composite film.

Claims

1. five-layer co-squeezing high-barrier packaging composite film, form by the printing surface bed of material (1), adhesive layer (2), aluminium foil (3), adhesive layer (4), hot sealing layer (5), the one side of adhesive layer (2) is equipped with the printing surface bed of material (1), another side is equipped with aluminium foil (3), adhesive layer (4), hot sealing layer (5), it is characterized in that, cast out aluminium foil (3), adhesive layer (4), hot sealing layer (5), be equipped with ethylene-vinyl alcohol copolymer EVOH five-layer co-squeezing film (6) at the another side of adhesive layer (2).

2. five-layer co-squeezing high-barrier packaging composite film according to claim 1, it is characterized in that, described ethylene-vinyl alcohol copolymer EVOH five-layer co-squeezing film (6), be made up of composite bed (7), bonding resin layer (8), EVOH resin bed (9), bonding resin layer (10), hot sealing layer (11), composite bed (7) is that skin, bonding resin layer (8) are internal layer for interlayer, bonding resin layer (10) for inferior interlayer, hot sealing layer (11) for time interlayer, EVOH resin bed (9).

3. five-layer co-squeezing high-barrier packaging composite film according to claim 1 and 2, it is characterized in that, described ethylene-vinyl alcohol copolymer EVOH five-layer co-squeezing film (6), its composite bed (7) can be that mono-also can mix for not containing or contain less LLDPE resin, the LDPE resin of opening agent and slip agent.

4. five-layer co-squeezing high-barrier packaging composite film according to claim 1 and 2, it is characterized in that, described ethylene-vinyl alcohol copolymer EVOH five-layer co-squeezing film (6), its hot sealing layer (11) is metallocene LLDPE resin, LLDPE resin, LDPE resin, can be partially mixed, also can be whole mixing, but must contain metallocene LLDPE resin.

5. five-layer co-squeezing high-barrier packaging composite film according to claim 1 and 2, it is characterized in that, described ethylene-vinyl alcohol copolymer EVOH five-layer co-squeezing film (6), its EVOH resin bed (9) is not more than 38% EVOH resin for ethylene contents, and Thickness Design is 〉=20 μ.