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Seven-layer co-extrusion transparent high-isolation film and preparation method thereof

A high-resistance, transparent technology, applied in the field of packaging materials, can solve problems such as high production costs and environmental pollution, and achieve the effects of preventing oxygen infiltration, high mechanical strength, and good transparency

Active Publication Date: 2015-02-25
HUANGSHAN NOVEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a large amount of compounding solvent remains in the transparent high-barrier film obtained by dry compounding, extrusion compounding and other processes, which will not only cause environmental pollution, but also cause high production costs.

Method used

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  • Seven-layer co-extrusion transparent high-isolation film and preparation method thereof
  • Seven-layer co-extrusion transparent high-isolation film and preparation method thereof
  • Seven-layer co-extrusion transparent high-isolation film and preparation method thereof

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preparation example Construction

[0036] The present invention also provides a preparation method of a transparent high barrier film, comprising the following steps:

[0037] Polyamide, linear low-density polyethylene, ethylene-vinyl alcohol copolymer and polyethylene are co-extruded to obtain a first polyamide layer, a first linear low-density polyethylene layer, and a second polyamide layer in sequential contact. Heat-melt pipe of amide layer, ethylene-vinyl alcohol copolymer layer, third polyamide layer, second linear low density polyethylene layer and polyethylene layer;

[0038] Blow molding the hot-melt pipe into a film, cooling and setting;

[0039] The outer surface of the film after cooling and setting is subjected to corona treatment to obtain a transparent high-barrier film.

[0040] The invention adopts a co-extrusion blow molding process to prepare a transparent high-barrier film, and the production process is relatively simple.

[0041] First, the first polyamide layer, the first linear low-den...

Embodiment 1~5

[0055] The transparent high-barrier film was prepared with a seven-layer co-extrusion upper blow molding equipment of the model VAREX produced by W&H in Germany:

[0056] Add the first polyamide layer raw material (denoted as Y1), the first linear low-density polyethylene layer raw material (denoted as Y2), the second polyamide layer Raw materials (denoted as Y3), raw materials for ethylene-vinyl alcohol copolymer layer (denoted as Y4), raw materials for the third polyamide layer (denoted as Y5), raw materials for the second linear low-density polyethylene layer (denoted as Y6) and polyethylene Layer raw materials (denoted as Y7), the specific formula of each raw material is shown in Table 2.

[0057] The raw materials in the 7 barrels were co-extruded and then blow molded. The inflation ratios were 2.2, 2.2, 2.2, 2.2 and 2.5 respectively, and the thickness of each layer was controlled. The thickness of each layer is shown in Table 2.

[0058] Table 2 The formula of raw mater...

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Abstract

The invention provides a seven-layer co-extrusion transparent high-isolation film and a preparation method thereof. The invention provides a transparent high-isolation film, which comprises a first polyamide layer, a first linear low density polyethylene layer, a second polyamide layer, an ethylene-vinyl copolymer layer, a third polyamide layer, a second linear low density polyethylene layer and a polyethylene layer which are sequentially contacted with one another. According to the transparent high-isolation film, the ethylene-vinyl copolymer has excellent oxygen resistance performance, and can prevent the oxygen from permeating; the polyethylene has excellent moisture resistance performance, and can prevent vapor from permeating; the polyethylene also has excellent low-temperature and heat-sealing performance, and can be used as an inner layer of the transparent high-isolation film; the polyamide has high mechanical strength, has excellent compatibility with the ethylene-vinyl copolymer, and can be used as a support protection layer of the ethylene-vinyl copolymer layer; and the polyamide has excellent printing performance and wear-resisting property, and can be used as an outer layer of the transparent high-isolation film.

Description

technical field [0001] The invention belongs to the technical field of packaging materials, in particular to a seven-layer co-extruded transparent high-barrier film and a preparation method thereof. Background technique [0002] With the advancement of chemical technology, the functional development trend of plastic packaging films is becoming more and more obvious. Among them, high-barrier plastic packaging films are one of the fastest-growing functional films. High-barrier film refers to a packaging film that protects the contents of the package from the infiltration of pollutants and small molecules such as oxygen, water vapor, liquids, and odors, and also prevents the contents of the package from seeping out. The high barrier property of high barrier film means that under the standard state of 23°C and 65% relative humidity, the oxygen transmission rate is less than 5ml / m 2 ·Less than one day, water vapor transmission rate <2g / m 2 d. [0003] The traditional high-b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08B32B27/30B32B27/32B32B27/34B65D65/40
Inventor 江继忠鲍祖本潘健陈旭周黎丽
Owner HUANGSHAN NOVEL
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