Low temperature resistant triple coextrusion composite film and preparation method thereof

A three-layer co-extrusion and composite film technology, which is applied in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve the problems of unusable, poor low temperature and freezing resistance, and reduce the heat sealing temperature , Improve the effect of low temperature resistance and freezing resistance

Active Publication Date: 2010-12-29
KAIDA GRP CO LTD FJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The existing three-layer co-extrusion composite film is mostly cast polypropylene film (CPP), which is made of common polypropylene (PP) raw material through three-layer co-extrusion of casting machine. This common PP film The raw material determines that the cast polypropylene film (CPP) has poor low temperature and freezing resistance, and cannot be used for packaging of frozen products below 0°C

Method used

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Embodiment Construction

[0013] The low-temperature-resistant three-layer co-extruded composite film of the invention is formed by three-layer co-extrusion of a casting machine, and has an outer layer, a middle layer and an inner layer compounded together.

[0014] The material of the middle layer adopts metallocene low-density linear polyethylene and polypropylene with a weight ratio of 1:10-1:1; wherein, the melt index of metallocene low-density linear polyethylene is 1-3.5; as a preferred embodiment, The weight ratio of metallocene low-density linear polyethylene to polypropylene can be 1:5 or 1:3 or 1:2.

[0015] The material of the inner layer is ternary copolymerized polypropylene and metallocene low-density linear polyethylene with a weight ratio of 1:10-1:1; wherein, the melt index of the ternary copolymerized polypropylene is 6-12, and the metallocene low-density linear polyethylene The melt index of polyethylene is 1-3.5; as a preferred embodiment, the weight ratio of terpolymerized polyprop...

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Abstract

The invention discloses a low temperature resistant triple coextrusion composite film and a preparation method thereof. The composite film in the invention is formed through carrying out triple coextrusion by a casting machine, and comprises an outer layer, a middle layer and an inner layer which are composited together; the materials of the middle layer adopt metallocene low-density linear polyethylene and polypropylene at the mass ratio of 1:10-1:1; and the melt index of the metallocene low-density linear polyethylene is 1-3.5. After the scheme is adopted, compared with the traditional CPP film, the low temperature resistant triple coextrusion composite film of the invention has the advantages of greatly improving the low temperature resistant and freezing resistance performance, being capable of being normally used under the environment of minus 30 DEG C, having no influence on the barrier property and strength thereof and being particularly suitable for packaging of quick frozen products such as boiled dumplings, sweet soup balls and the like.

Description

technical field [0001] The invention relates to a three-layer co-extruded composite film, in particular to a low-temperature resistant three-layer co-extruded composite film and a preparation method thereof. Background technique [0002] At present, three-layer co-extruded composite films have been widely used in food, medicine, chemical and other fields, among which food packaging accounts for the largest proportion, such as beverage packaging, quick-frozen food packaging, cooking food packaging, fast food packaging, etc. These products All have brought great convenience to people's life. [0003] The existing three-layer co-extrusion composite film is mostly cast polypropylene film (CPP), which is made of common polypropylene (PP) raw material through three-layer co-extrusion of casting machine. This common PP film The raw material determines that the cast polypropylene film (CPP) has poor low temperature and freezing resistance, and cannot be used for the packaging of fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/32B29C47/06B29C47/92B29C48/21B29C48/08B29C48/92
CPCB29C48/92B29C2948/92704B29C48/08B29C48/21B29C2948/92895
Inventor 吕文艺
Owner KAIDA GRP CO LTD FJ
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