CN201105860Y

CN201105860Y - Novel fresh meat thermal shrinkage keeping-fresh bag film

Info

Publication number: CN201105860Y
Application number: CN 200720094630
Authority: CN
Inventors: 付家庆; 王蔚; 田永红; 李广宇; 李春生; 王启富; 李春胜; 刘鸿雁; 谭宏杰; 孙明哲; 王安; 庞玉艳; 吴艳丽
Original assignee: Jilin Academy of Agricultural Machinery
Current assignee: Jilin Academy of Agricultural Machinery
Priority date: 2007-11-20
Filing date: 2007-11-20
Publication date: 2008-08-27
Anticipated expiration: 2017-11-20

Abstract

The utility model relates to a novel thermal shrinkage freshness protection package membrane for raw meats, pertaining to the food packaging field, which is pressed and composited by seven layers. By taking modified polyvinyl alcohol PVA as substrate, the novel thermal shrinkage freshness protection package membrane has high barrier property. The seven layers are respectively VLDPE/adhesive/PVA/EVOH/PVA/adhesive/LDPE. The EVOH is copolymer of ethylene - vinyl alcohol, and the VLDPE is modified polyethylene with low density; the membrane is characterized by high barrier, high shrinkage and low cost and is particularly suitable for packaging raw meats and shelf life can reach 50days.

Description

A kind of novel fresh meat thermal contraction freshness protection package film

Technical field

The utility model is applicable to the packing of food, chemical industry, medicine, precision instrument, the fresh-keeping flexible packaging film of particularly a kind of novel fresh meat thermal contraction.

Background technology

The packing requirements of fresh meat is very high in the food, should be fresh-keeping, extend the shelf life again and shelf life, but require to develop have good barrier property, intensity height, anti-puncture, nonpoisonous and tasteless, the transparent low temperature contraction of gloss, long shelf-life, environment friendly and pollution-free, the packaging film that meets the international hygiene standard.Popularly in the world at present pack fresh meat with PP TYPE, especially in recent years development was very rapid, develop into five layers, seven layers by initial three layers, four layers, more domestic large enterprises all select products such as the U.S., Japan for use at present, but cost an arm and a leg, exceed 50%-80% than homemade film price approximately, and homemade film quality instability, the level of performance out of reach film imported, application less.

Summary of the invention

Problem to be solved in the utility model is that make a living fresh meat class packing provides a kind of novel seven-layer co-extrusion thermal contraction preservative film.

The utility model is achieved in that

A kind of novel fresh meat thermal contraction freshness protection package film is characterized in that the freshness protection package membrane structure is the symmetric form structure, is seven layers altogether, i.e. A ₁/ B/C/D/C/B/A ₂Form symmetry, wherein A ₁Layer is outer stress layer, A ₂Layer is the internal layer hot sealing layer, and the B layer is a bonding coat, and the C layer is a gas barrier layer, and the D layer is a high-obstruction; Described A _1,2Layer is modified low-density polyethylene VLDPE and LDPE film, and the B layer is a modification binder resin film, and the C layer is a modified polyvinylalcohol PVA film, and the D layer is ethylene-vinyl alcohol interpolymer EVOH or ethene-vinyl acetate copolymer EVA high-resistant diaphragm.

Above-mentioned polyethylene VLDPE, LDPE film, PVAC polyvinylalcohol film, EVOH or EVA high-resistant diaphragm are prior art and industry specification term.

Because, PVA there is fabulous barrier properties for gases and protects the flavor fragrance protectiveness because of it as the high-barrier functional material, but because the close hygroscopic property with heat decomposition temperature of its fusing point is poor, so by adding plasticizer, interfacial agent and other auxiliary agents carry out blending and modifying and have successfully solved the problems referred to above this project to it.

Ectonexine is selected modification VLDPE and LDPE for use.

Binder resin is selected 528H for use

The D layer is then selected EVOH or EVA for use

Technical characterictic by above-mentioned apolegamy the utility model film is: pulling strengrth 44/46MPa, breaking elongation are 125/150%, oxygen transit dose≤10cm ³/ m ²24h0.1MPa, steam penetrating capacity＜30g/m ²24h, percent thermal shrinkage 30-50%, resistance to cold keeps toughness at-50 ℃.

It is base material that the utility model adopts the modified PVA polyvinyl alcohol, design a kind of seven-layer co-extrusion thermal contraction preservative film, compared with prior art has following obvious advantage: 1. fabulous diaphaneity and glossiness, not dust suction, static electrification not, 2. higher draw tensile strength and percentage elongation are arranged, good resistance to abrasion, 3. fabulous barrier properties for gases is arranged under the low temperature condition and protect the fragrant flavor property of protecting, its resistance oxygen is better than EVOH and PVDC, PA, thermal viscosity and fuel resistance are fabulous, can use down at 180 ℃-200 ℃, 4. and environment friendly and pollution-free, become a kind of novel thermal contraction preservative film in the fresh meat Package.5. cost is low.

Description of drawings

Fig. 1 is embodiment 1 a described novel fresh meat thermal contraction preservative film structural representation.

Below in conjunction with drawings and Examples the utility model is further specified

The specific embodiment

Embodiment 1:

As shown in the figure, the A layer is outermost layer and innermost layer in the seven-layer structure, material is modified low-density polyethylene VLDPE and LDPE, and model is selected AFF/MTYRL1881G for use, and the B layer is a binder resin, selecting model for use is the 528H of Mitsui ﹠ Co., Ltd., the C layer is that high-obstruction (choke) material is the PVA modified polyvinylalcohol, and its fusing point is 160 ℃, and Vicat softening point is about 140 ℃, the D layer is EVOH for high barrier material, and model is EF-443.Above-mentioned material is expressed into the blend of superposing type seven-layer co-extrusion die head through seven extruders and extrudes, and through the vacuum sizing water-cooled, technological processes such as traction, biaxial tension, thermal finalization, rolling, packing form finished product.Gross thickness is 50 μ m, and the folding footpath is 270mm.

This film uses through use department, and reflection is good, and performance reaches the external product level, and cheap, and the market competitiveness is arranged very much.

Claims

1, a kind of novel fresh meat thermal contraction freshness protection package film is characterized in that the freshness protection package membrane structure is the symmetric form structure, is seven layers altogether, i.e. A ₁/ B/C/D/C/B/A ₂Form symmetry, wherein A ₁Layer is outer stress layer, A ₂Layer is the internal layer hot sealing layer, and the B layer is a bonding coat, and the C layer is a gas barrier layer, and the D layer is a high-obstruction.

2, a kind of novel fresh meat thermal contraction freshness protection package film according to claim 1 is characterized in that A _1,2Layer is modified low-density polyethylene VLDPE and LDPE film.

3, a kind of novel fresh meat thermal contraction freshness protection package film according to claim 1 is characterized in that the B layer is a modification binder resin film.

4, according to claim 1 according to claim 1 novel fresh meat thermal contraction freshness protection package film, it is characterized in that the C layer is a modified polyvinylalcohol PVA film.

5, a kind of novel fresh meat thermal contraction freshness protection package film according to claim 1 is characterized in that the D layer is ethylene-vinyl alcohol interpolymer EVOH or ethylene-vinyl acetate copolymer EVA high-resistant diaphragm.