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Three-layer co-extrusion EVA composite casting film and manufacture method thereof

A three-layer co-extrusion and manufacturing method technology, which is applied in the field of preparation of new plastic films, can solve the problems of poor film thickness uniformity, low transparency, and low output, so as to achieve variety diversification, wide application, and low output. Effect

Inactive Publication Date: 2014-06-04
曹修苗
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention adopts the blow molding process, the output is low, the thickness uniformity of the film is not good, and the transparency is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]The three-layer co-extruded EVA composite cast film is composed of three layers of co-extrusion, the outer layer, the middle layer and the inner layer. Among them, the opening agent of the outer raw material is synthetic silica, the nucleating agent is Milliken HPN-20E, and the metallocene polyethylene is Mitsui SP1520 in Japan. The three raw materials are mixed uniformly to form a composition. The mass ratio of the raw materials is Silica: Milliken HPN-20E: Mitsui SP1520=0.5%: 0.5%: 99%. The raw material of the middle layer is EVA, and the VA content in the EVA resin is 14%. The opening agent of the inner layer raw material is synthetic silica, the nucleating agent is Milliken HPN-20E, and the metallocene polyethylene is Mitsui SP1520 of Japan. The three raw materials are mixed uniformly to form a composition, and the mass ratio of the raw materials is two Silicon oxide: Milliken HPN-20E: Mitsui SP1520 = 0.5%: 0.5%: 99%. And the mass percentage among the outer layer, ...

Embodiment 2

[0035] The three-layer co-extruded EVA composite cast film is composed of three layers of co-extrusion, the outer layer, the middle layer and the inner layer. Wherein, the opening agent of the outer layer raw material is synthetic silicon dioxide, the nucleating agent is Milliken HPN-20E, and the low-density polyethylene is Qatar LDPEFD0474, and the three kinds of raw materials are mixed uniformly to form a composition, and the mass ratio of its raw material composition is Silica: Milliken HPN-20E: Qatar LDPE FD0474 = 0.5%: 0.5%: 99%. The raw material of the middle layer is EVA, and the VA content in the EVA resin is 18%. The opening agent of the inner raw material is synthetic silica, the nucleating agent is Milliken HPN-20E, and the low-density polyethylene is Qatar LDPE FD0474. The three raw materials are mixed evenly to form a composition, and the mass ratio of the raw materials is two Silica: Milliken HPN-20E: Qatar LDPE FD0474=0.5%:0.5%:99%. And the mass percentage amo...

Embodiment 3

[0037] The three-layer co-extruded EVA composite cast film is composed of three layers of co-extrusion, the outer layer, the middle layer and the inner layer. Wherein, the opening agent of the outer layer raw material is synthetic silicon dioxide, the nucleating agent is Milliken HPN-20E, and the polypropylene is Exxon 5032E3, and the three kinds of raw materials are mixed uniformly to form a composition, and the mass ratio of its raw material composition is Silica: Milliken HPN-20E: Exxon 5032E3 = 0.5%: 0.5%: 99%. The raw material of the middle layer is EVA, and the VA content in the EVA resin is 21%. The opening agent of the inner layer raw material is synthetic silica, the nucleating agent is Milliken HPN-20E, and the polypropylene is Exxon 5032E3. The three raw materials are mixed evenly to form a composition, and the mass ratio of the raw materials is Silicon: Milliken HPN-20E: Exxon 5032E3 = 0.5%: 0.5%: 99%. And the mass percentage among the outer layer, the middle lay...

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Abstract

The invention relates to a three-layer EVA composite casting film and a manufacturing method thereof. The composite casting film is formed through co-extrusion of three layers including an outer layer, a middle layer and an inner layer. The outer layer comprises the raw material of a composition of an opening agent, a nucleating agent and a mixture of high density polyethylene, low density polyethylene, polypropylene and metallocene polyethylene; the middle layer comprises the raw material of EVA; the inner layer comprises the raw material of a composition of an opening agent, a nucleating agent and a mixture of high density polyethylene, low density polyethylene, polypropylene and metallocene polyethylene. The production process is as below: mixing the raw materials; adding the materials according to the requirements into three extruders, A, B and C, for extrusion casting; then cooling for shaping; conducting corona treatment; and cutting and rolling to eventually obtain a transparent EVA composite film. Through implementation of the invention, the produced EVA film is non-toxic, harmless, recyclable and decomposable, does not produce poisonous gas during combustion or pollute the atmosphere, and contains no plasticizer; and the EVA film is cleaner than a traditional PVC plastic film, and shows promising prospect.

Description

technical field [0001] The invention relates to the technical field of preparation of a novel plastic film, in particular to a three-layer co-extruded EVA composite casting film and a manufacturing method thereof. technical background [0002] my country's plastics production industry has developed rapidly, and plastic film production enterprises have sprung up like mushrooms after rain, and the product structure has also been continuously improved. In the production of cast film, in the past, single-layer structure was basically used to produce products with single performance, but now there are more demands on the market for products with different performance, wide application and good packaging effect. Multi-layer co-extruded cast film is accepted by people because of its low production cost, good film quality, strong adaptability, and convenient post-process processing. It gradually replaces the status of single-layer cast film and becomes a new generation of cast film....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/18
Inventor 曹修苗
Owner 曹修苗
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