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Shape memory low temperature high shrinking film and its preparation method

A high-shrinkage, low-temperature technology, applied to flexible coverings, packaging, wrapping paper, etc., can solve the problems of damaging the appearance of fresh meat, large equipment investment, and difficult processing

Inactive Publication Date: 2009-05-13
朱家牧
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that existing polyamide is used as the film produced by the main resin, and there is a natural shrinkage phenomenon at normal temperature; the shrink film is processed as the main raw material with polyvinylidene chloride resin, and the processing difficulty is large, and the equipment investment is large ( Radiation cross-linking), has the disadvantages of environmental pollution; the heat shrinkage temperature of the heat shrinkable film used in fresh meat packaging is currently mostly between 80 and 95°C, if the packaging process is not appropriate, the temperature is too high or the heat shrinkage time is too long long, often causes the surface of fresh meat to be scalded, destroys the appearance of fresh meat, and shortens the preservation period. A shape memory low-temperature high-shrinkage film and its preparation method are provided

Method used

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  • Shape memory low temperature high shrinking film and its preparation method
  • Shape memory low temperature high shrinking film and its preparation method
  • Shape memory low temperature high shrinking film and its preparation method

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specific Embodiment approach 1

[0005] Embodiment 1: The heat-shrinkable film of this embodiment is made of a shape-memory polymer that is blown at 175-190°C and then cooled to ≤40°C, then heated to 50-85°C and biaxially stretched, then cooled and shaped to ≤ It is made by winding at a temperature of 50°C, and the shape memory polymer includes polyvinyl lactone (PCL), carbon dioxide polymer (PPC), styrene-butadiene polymer (SB), polyvinyl butyrate Aldehyde (PVB), polylactic acid (PLA), polyvinyl alcohol (PVA), ethylene vinyl alcohol polymer (EVOH) or modified polyolefin (PO).

specific Embodiment approach 2

[0006] Embodiment 2: The shape memory low-temperature high-shrinkage film of this embodiment is a single-material single-layer film or a single-material multilayer film, and the structure is A material layer, B material layer and A material layer, or A material layer , B material layer and C material layer, or A material layer, B material layer, C material layer, B material layer and A material layer, or A material layer, B material layer, C material layer, D material layer, E Material layer and F material layer. Other methods and structures are the same as in the first embodiment. (Different letters in this embodiment represent different materials.)

specific Embodiment approach 3

[0007] Specific embodiment three: the shape-memory low-temperature high-shrinkage film of this embodiment is a multi-material, multi-layer barrier film (or functional film), and the three-layer structure is A material, B material and A material as the first layer, PLA material , SB material, PLASB material, PLA material and SB material as the second layer, A material, B material, C material, PLA material, adhesive resin and PO material as the third layer, or SB as the first layer, adhesive resin is the second layer, PO is the third layer; five or more layers are any one of a certain polymer multilayer, and the barrier layer can be one or any multilayer, and one outer layer is heat-sealed layer, PLA or SB, adhesive resin, EVOH or / and PVA, adhesive resin, PO. Other methods and structures are the same as in the first embodiment.

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Abstract

The present invention relates to a shape memory low-temperature high shrink film for packaging raw fresh meats and its preparation method. Its preparation method includes the following steps: using shape memory polymer as raw material, blowing up at 175-190deg.C, cooling to less than or equal to 40deg.C, more heating to 50-85deg.C, bidirectional tension, cooling and setting to less than or equal to 50deg.C and coiling up so as to obtain the invented product.

Description

technical field [0001] The invention relates to a heat-shrinkable film and a preparation process of the heat-shrinkable film. Background technique [0002] The film produced with polyamide as the main resin has a natural shrinkage phenomenon at room temperature; the shrink film processed with polyvinylidene chloride resin as the main raw material has high processing difficulty, large equipment investment (radiation crosslinking), and environmental pollution. shortcoming. Such as Japan Kureha Chemical Industry Co., Ltd.'s "stretched multilayer film casing and its preparation method", the publication number is CN1252348A; "Heat-shrinkable multilayer film" of Kureha Chemical Industry Co., Ltd., the publication number is CN1365886A; the "multilayer heat-shrinkable film" of Greece Sporos Co., Ltd., the publication number is CN1411409A. The invention patent and invention patent application are all based on The heat-shrinkable films produced by flat-extrusion down-blowing water-c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B65D65/38B65D65/40B29C55/28B29K67/00B29K81/00B29K9/06B29K59/00B29K29/00B29K23/00
Inventor 朱家牧
Owner 朱家牧