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Multilayer heat shrinkage film

A heat-shrinkable film and outer layer technology, applied in the field of packaging materials, can solve the problems of affecting the appearance quality of the heat-shrinkable film, increasing the cost, increasing the processing steps, etc.

Inactive Publication Date: 2012-05-02
广州澳霸塑料制品有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Electron beam accelerator is a very expensive equipment used in the production of heat shrinkable film. Although the use of electron beam accelerator can improve the high temperature resistance of heat shrinkable film, it also increases the cost, increases the processing steps, and reduces the Productivity
In addition, if an electron beam accelerator is used to irradiate a heat shrinkable film with an oxygen barrier layer, such as a heat shrinkable film whose oxygen barrier material is PVDC, the components of the oxygen barrier layer will also be oxidized and appear yellow, which also affects the heat shrinkable film. Appearance quality

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0096] With the raw materials and proportions shown in Table 1, the raw materials used in each layer are first co-extruded into a multi-layer billet tube by means of multi-layer co-extrusion, and then the co-extruded multi-layer billet tube is passed through a warm water bath at 90°C Post-foam blown film, biaxially stretched 3.2 times in the machine direction (MD) and 3.6 times in the transverse direction (TD), then cooled to 15°C with air, and the cooled biaxially stretched The stretched multi-layer heat-shrinkable film is rolled up for further processing. All processed tube-packed films are processed into a width of 350mm for inspection.

[0097] The raw material ratio of embodiment 1~embodiment 9, comparative example 1~5 is shown in Table 1;

[0098] The heat-shrinkable films prepared in Comparative Examples 2 and 3 were treated by an electron accelerator with an intensity of 5 MRad.

[0099] The process parameters of Examples 1 to 9 and Comparative Examples 1 to 5 are sh...

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Abstract

The invention discloses a multilayer heat shrinkage film, which comprises a heat sealing layer, an outer layer and a middle layer, wherein the heat sealing layer is in contact with a packing object, the middle layer is connected with the outer layer and the heat sealing layer, the heat sealing layer comprises ultra-low-density polyethylene and one of materials or a mixture of more than one of materials selected from enhanced middle-density polyethylene, linear low-density polyethylene, low-density polyethylene, ethylene alpha-olefins plastic body copolymers, metallocene polyethylene and ethylene-ethylene vinyl acetate copolymers, and the outer layer comprises ethylene-ethylenepropylene polymers and one of materials or a mixture of more than one of materials selected from enhanced middle-density polyethylene, linear low-density polyethylene, low-density polyethylene, ethylene alpha-olefins plastic body copolymers, metallocene polyethylene and ethylene-ethylene vinyl acetate copolymers. Experiment results show that the multilayer heat shrinkage film prepared by the invention has a wider heat sealing temperature range, and in addition, the mechanical performance and the optical performance are good.

Description

technical field [0001] The invention relates to the technical field of packaging materials, and more specifically relates to a multilayer heat shrinkable film. Background technique [0002] Commodity packaging plays an important role in the storage, transportation, quality assurance and beautification of commodities. With the advancement of technology, people put forward higher performance requirements for packaging materials. At present, as a packaging material with excellent performance, multi-layer heat shrinkable film has been widely used in the packaging of food and industrial products. Compared with traditional packaging materials, multi-layer heat shrinkable film has many advantages: for example, heat shrinkable film can achieve the effect of "body-fitting" packaging for goods after heat shrinkage, so that the goods can maintain their own appearance shape and make the appearance of the goods more beautiful. It is beautiful and saves space; as another example, multi-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/30B32B27/34B32B7/10B65D65/40
CPCB32B27/34B32B7/10B32B27/30B32B27/32B32B2250/242B32B2250/246B32B2307/736
Inventor 林姗吴卓彬
Owner 广州澳霸塑料制品有限公司
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