CN2649315Y

CN2649315Y - High-separate multi-layer coextruding blow-moulding film

Info

Publication number: CN2649315Y
Application number: CNU032630131U
Authority: CN
Inventors: 赵启辉; 项爱民; 刘万蝉; 白胜国; 康智勇
Original assignee: Research And Development Center Of China Light Industrial Plastic Processing Research Institute; LIGHT INDUSTRY PLASTIC PROC AP
Current assignee: Research And Development Center Of China Light Industrial Plastic Processing Research Institute; LIGHT INDUSTRY PLASTIC PROC AP
Priority date: 2003-09-29
Filing date: 2003-09-29
Publication date: 2004-10-20
Anticipated expiration: 2013-09-29
Also published as: WO2005030478A1

Abstract

The utility model discloses a high barrier property multi-layer co-extrusion blowing plastic film, with PVA as a barrier layer, whose inner and outer lateral respectively provide plastic film of one or two films, and an adhesive film is arranged between the barrier layer and the plastic film. The utility model has good barrier property, high interlayer strength for preventing separation of each layer, rim leftover and waste can be degraded and recycled for utilization, which is nontoxic and harmless to the environment.

Description

The multi-layer co-extruded blown film of a kind of high barrier

Technical field

The utility model relates to a kind of packaging material, specifically, is the multi-layer co-extruded blown film of a kind of high barrier.

Background technology

At present, along with the development in market and improving constantly of people's lives, people also constantly propose new requirement to the requirement of commodity packaging, the packing of some frozen food, aquatic products, high-temperature cooking food, rare medicinal herbs, essence and flavoring agent, various beverage, drinks, tealeaves, coffee, oily food, high-accuracy machine components and instrument etc. particularly, require packaging material not only to have favorable waterproof property, also should have good barrier performance simultaneously, promptly prevent the performance of organic solvent infiltration.For satisfying consumer's requirement, each manufacturer is all endeavouring to research and develop novel barrier packaging material and products thereof.

The waterproof Obstruct membrane that packaging field is commonly used is PVDC film and EVOH film at present.Wherein PVDC (polyvinylidene chloride has another name called Vingon) film has higher barrier, but because the leftover pieces of PVDC film and discarded object are difficult to recycle, emits HCl gas during burning disposal, can cause environmental pollution.America and Europe and Taiwan have turned to uses EVOH (ethylene-vinyl alcohol copolymer) film, and the EVOH film has advantage nontoxic, free from environmental pollution, but it is by the rubbing method preparation, and its complicated operation, production efficiency are low.

Summary of the invention

The purpose of this utility model provides a kind of multi-layer co-extruded blown film, and it has the excellent waterproof barrier property.

For achieving the above object, the utility model is taked following scheme: the utility model adopts PVA (polyvinyl alcohol) as barrier layer.The inboard and the outside at barrier layer have one deck or two-layer plastic film layers respectively.

For the convenience that illustrates, the following noun of specific justice:

The inboard of barrier layer is meant the side that the coextrusion blow film contacts with packing material, and the outside of barrier layer is meant the opposite side that the coextrusion blow film contacts with environment.

With one deck of the inboard next-door neighbour of barrier layer be interior one deck, with interior one deck next-door neighbour be interior two layers, with interior two layers of next-door neighbour be interior three layers; With one deck of barrier layer outside next-door neighbour be outer one deck, with outer one deck next-door neighbour be outer two layers, with outer two layers of next-door neighbour be outer three layers.

Can be according to packing material and environmental condition different, plastic film layers also can be different, can be in PE film (polyethylene film), PP film (polypropylene screen), PA film (PA membrane), PC film (polycarbonate membrane), PET (PETG) film, PBT (polybutylene terephthalate (PBT)) film one or more usually.

In order to improve the adhesive strength of each layer of the utility model, can also between barrier layer and adjacent plastic film layers, be provided with the layer of adhesive layer.At this moment, interior one deck and outer one deck are adhesive phase, and interior two layers, interior three layers, outer two layers, outer three layers is plastic film layers.

Adhesive can be one or both in EVA (vinyl-vinyl acetate copolymer), EAA (ethylene-acrylic acid copolymer), polyacrylate, the maleic anhydride.

The thickness of PVA barrier layer is 1～10 μ m, and the thickness of each plastic film layers is 1～20 μ m, and the thickness of adhesive phase is 1～10 μ m.

The utility model has the advantages that: barrier property is good; Interlaminar strength height, each layer are not easily separated; Leftover pieces and discarded object degradable and recycling, nontoxic to environment.

Description of drawings

Fig. 1 is the structural representation of embodiment 1 of the present utility model

Fig. 2 is the structural representation of embodiment 6 of the present utility model

Fig. 3 is the process chart of embodiment 6 of the present utility model

Fig. 4 is the structural representation of embodiment 8 of the present utility model

The specific embodiment

Embodiment 1

Please refer to Fig. 1.In the present embodiment, the multi-layer co-extruded blown film of high barrier by outer one deck 1, barrier layer 2, interior one deck 3 totally three layers constitute.Barrier layer 2 is PVA, and its thickness is 5 μ m.Outer one deck 1 is the PE film of 3 μ m, and interior one deck 3 is PP films of 3 μ m.

Embodiment 2-5

Please refer to table 1.These embodiment also be by outer one deck 1, barrier layer 2, interior one deck 3 totally three layers constitute.In these embodiments, outer one deck 1 and interior one deck 3 have adopted the plastic sheeting different with embodiment 1.And the thickness of each layer is identical with embodiment 1, and barrier layer 2 is identical with embodiment 1.

The structural table of table 1 embodiment 2

	Outer one deck 1	Barrier layer 2	Interior one deck 3
	Outer one deck 1	Barrier layer 2	Interior one deck 3	Embodiment 2	PE	PVA	PE
Embodiment 3	PC	PVA	PP	Embodiment 2	PE	PVA	PE
Embodiment 3	PC	PVA	PP	Embodiment 4	PET	PVA	PBT
Embodiment 5	PBT	PVA	PET	Embodiment 4	PET	PVA	PBT

Embodiment 6

Please refer to Fig. 2.In the present embodiment, the multi-layer co-extruded blown film of high barrier by outer two layer 4, outer one deck 1, barrier layer 2, interior one deck 3, interior two layer 5 totally five layers constitute.Outer two layer 4 and interior two layer 5 is plastic film layers, and outer one deck 1 and interior one deck 3 are adhesive phases.Barrier layer 2 is PVA (polyvinyl alcohol), and its thickness is 8 μ m.Outer two layer 4 is PE films of 3 μ m, and interior two layer 5 also is the PE film of 3 μ m.Outer one deck 1 is the EVA of 1 μ m, and interior one deck 3 also is the EVA of 1 μ m.

Please refer to Fig. 3.During the preparation present embodiment, an extruder squeezes PVA barrier layer 2, and another extruder squeezes PE plastic film layers 4 and 5, the three extruder EVA adhesive layers 1 and 3.The runner of PE is divided into two strands symmetrically in head, two aspects of difference, promptly outer two layer 4 and interior two layer 5.In like manner, the runner of EVA also is divided into two strands symmetrically in head, two aspects of difference, promptly outer one deck 1 and interior one deck 3.The benefit of doing like this is only to have used three extruders, just can moulding five layers blown film.The another one advantage of such production process is to need not to add entry or organic solvent.

Embodiment 7

The difference of present embodiment and embodiment 6 is that outer two layer 4 is PP films of 3 μ m, and outer one deck 1 is the EAA of 1 μ m, and the material of other each layer is identical with embodiment 6 with thickness.Present embodiment needs 5 extruders to extrude five layers blown film.

Embodiment 8

Present embodiment has increased outer three layer 6 and interior three layer 7 again and has been total to the two layers of plastic thin films layer on the basis of embodiment 6.This is two-layer all to be the PP film of 3 μ m.Like this, present embodiment constitutes by seven layers, is successively from outside to inside: outer three layer 6 (the PP films of 3 μ m), outer two layer 4 (the PE films of 3 μ m), outer one deck 1 (EVA of 1 μ m), barrier layer 2 (PVA of 8 μ m), interior one deck 3 (EVA of 1 μ m), interior two layer 5 (the PE films of 3 μ m), interior three layer 7 (the PP films of 3 μ m).

The multi-layer co-extruded blown film of the described high barrier of embodiment 1-8 through long term test and on probation, all has excellent waterproof property and barrier property, and preparation is simple, nontoxic pollution-free.

Claims

1. multi-layer co-extruded blown film of high barrier, it is characterized in that: PVA has one deck or two-layer plastic film layers as barrier layer respectively in the inboard and the outside of barrier layer.

2. the multi-layer co-extruded blown film of high barrier according to claim 1 is characterized in that, is provided with the layer of adhesive layer between barrier layer and adjacent plastic film layers.

3. the multi-layer co-extruded blown film of high barrier according to claim 1 is characterized in that: described plastic sheeting is one or more in PE film, PP film, PA film, PC film, PET film, the PBT film.

4. the multi-layer co-extruded blown film of high barrier according to claim 2 is characterized in that: described adhesive is one or both in EVA, EAA, polyacrylate, the maleic anhydride.

5. the multi-layer co-extruded blown film of high barrier according to claim 1 and 2 is characterized in that: the thickness of described barrier layer is 1～10 μ m.

6. the multi-layer co-extruded blown film of high barrier according to claim 1 and 2 is characterized in that: the thickness of described plastic film layers is 1～20 μ m.

7. the multi-layer co-extruded blown film of high barrier according to claim 2 is characterized in that: the thickness of described adhesive phase is 1～10 μ m.