Multilayer coextruding pyrocondensation film

A heat-shrinkable film, multi-layer co-extrusion technology, used in layered products, synthetic resin layered products, grafted polymer adhesives, etc. and other problems, to achieve the effect of good transparency, good anti-pollution heat sealing and good gas barrier properties

Active Publication Date: 2008-11-19
SUZHOU TIPACK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a PVDC multi-layer co-extruded heat shrinkable film, which aims to effectively solve the problems of current multi-layer co-extruded heat-shrinkable bags with low shrinkage, poor barrier properties, and brittleness at low temperatures. defect

Method used

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  • Multilayer coextruding pyrocondensation film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] First prepare the raw materials of each layer, core layer B: 98kg of VDC-MA copolymer and 2kg of epoxidized soybean oil. Surface layer A: 60kg of ethylene-alpha olefin copolymer and 40kg of ethylene-EMAA copolymer, the density of ethylene-alpha olefin copolymer is 0.88g / cm 3 . Heat seal layer C: 50kg of ethylene-propylene copolymer and 50kg of LLDPE, the density of ethylene-propylene is 0.88g / cm 3 , the density of LLDPE is 0.90g / cm 3 . Adhesive layer D and adhesive layer E: 5kg of EVA with a density of 0.93g / cm 3 .

[0025] The raw materials of each layer are added to the extruder of each layer to melt and plasticize, and then enter a multi-layer co-extrusion circular die to distribute the melt to form a multi-layer circular melt tube; The body tube blank is cooled and formed by vacuum sizing, and then enters the hot water tank to be heated to a suitable blowing temperature, and the compressed air is filled between two pairs of nip rollers for horizontal blowing an...

Embodiment 2

[0027] First prepare the raw materials of each layer, core layer B: 98kg of VDC-MA copolymer and 2kg of epoxidized soybean oil. Surface layer A: 50kg of various ethylene-alpha olefin copolymers and 50kg of ethylene-EAA copolymers, the density of various ethylene-alpha olefin copolymers is 0.917g / cm 3 . Heat seal layer C: 60kg of ethylene-butene copolymer and 40kg of POP, the density of ethylene-butene copolymer is 0.917g / cm 3 , the density of POP is 0.92g / cm 3 . Adhesive layer D and adhesive layer E: 25kg of EVA with a density of 0.94g / cm 3 .

[0028] Other methods and structures are the same as in Embodiment 1.

Embodiment 3

[0030] First prepare the raw materials of each layer, core layer B: 98kg of VDC-MA copolymer and 2kg of epoxidized soybean oil. Surface layer A: 100 kg of ethylene-EVA copolymer. Heat seal layer C: 100kg of ethylene-hexene-1 copolymer, the density of ethylene-hexene-1 copolymer is 0.90g / cm 3 . Adhesive layer D and adhesive layer E: 5 kg of maleic anhydride-modified ethylene polymer.

[0031] Other methods and structures are the same as in Embodiment 1.

[0032]After testing, the main performance indicators of the multi-layer co-extruded heat shrinkable film obtained by adopting the technical solution of the present invention are shown in Table 1.

[0033] Table 1

[0034] Test items

Example 1

Example 2

Example 3

Longitudinal and transverse tensile strength

56MPa

58MPa

50MPa

Longitudinal and transverse elongation at break

110％

115％

113％

Seal strength

15N / 15mm

17N / 15mm

16N / 15mm

[00...

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Abstract

2499. The invention provides a multilayer coextrusion heat shrinking film which comprises a surface layer, a sandwich layer and a heat-sealing layer. The surface layer and the heat-sealing layer are respectively bonded with the sandwich layer through a bonding layer; the sandwich layer comprises a mixture composed of 98Wt% of PVDC resin and 2Wt% of processing aid, wherein, the PVDC resin is a VDC-MA copolymer, the melting point is 150 DEG C, the density is 1.7g/cm<3>, and the processing aid is epoxidized soybean oil or other plasticizing agent systems. The proposal increases the shrinkage factor of the multilayer coextrusion heat shrinking film, and improves the barrier property; the multilayer coextrusion heat shrinking film has excellent heat sealing performance, and is widely applied to the vacuum shrink package.

Description

technical field [0001] The invention relates to a heat-shrinkable film, in particular to a PVDC multilayer co-extruded heat-shrinkable film, which belongs to the technical field of plastic products and packaging materials. Background technique [0002] Commodity packaging plays an important role in the storage, transportation, quality assurance and beautification of commodities. The traditional packaging methods are mainly carton packaging and bundled packaging. However, with the development of the economy, the advancement of science and technology, the ever-changing products, and the fact that people's lives are becoming more convenient and leisurely, there are higher requirements for product packaging. Based on this, with the emergence of new materials, people began to use polyethylene (PE) heat shrinkable film packaging to replace carton packaging and bundling. Polyethylene heat-shrinkable film has many advantages as packaging: saving materials, reducing costs, moisture...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/30B32B27/32B32B7/12C08L27/08C08K5/1515C08L23/08C09J123/08C09J151/06B29C69/00B29C47/06B65D65/40C09J123/26
Inventor 张文芳张建岭
Owner SUZHOU TIPACK
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