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Seven-layer co-extruded high-barrier transparent film and preparation method thereof
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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, thin thickness, and good moisture resistance
Active Publication Date: 2015-09-02
HUANGSHAN NOVEL
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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.
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[0034] The present invention also provides a preparation method of a transparent high barrier film, comprising the following steps:
[0035] Co-extruding polyethylene, adhesive resin and ethylene-vinyl alcohol copolymer to obtain a first polyethylene layer, a second polyethylene layer, a first adhesive resin layer, and an ethylene-vinyl alcohol copolymer layer, the second adhesive resin layer, the third polyethylene layer and the hot-melt pipe of the fourth polyethylene layer;
[0036] Blow molding the hot-melt pipe into a film, cooling and setting;
[0037] The outer surface of the film after cooling and setting is subjected to corona treatment to obtain a transparent high-barrier film.
[0038] The invention adopts a co-extrusionblow molding process to prepare a transparent high-barrier film, and the production process is relatively simple.
[0039] Firstly, the raw materials that make up the first polyethylene layer, the second polyethylene layer, the first adhesive resi...
Embodiment 1~4
[0053] 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:
[0054] Add raw materials for the first polyethylene layer (denoted as Y1), raw materials for the second polyethylene layer (denoted as Y2), and raw materials for the first adhesive resin layer (denoted as Y3), ethylene-vinyl alcohol copolymer layer raw material (denoted as Y4), second adhesive resin layer raw material (denoted as Y5), third polyethylene layer raw material (denoted as Y6) and fourth polyethylene layer raw material (denoted as Y5) Denoted as Y7), the specific formula of each raw material is shown in Table 2.
[0055] The raw materials in the seven barrels were co-extruded and then blown. The inflation ratios were 1.5, 2.0, 2.5 and 3.0, and the thickness of each layer was controlled. The thickness of each layer is shown in Table 2.
[0056] Table 2 The formula of raw materials used in each layer of th...
Embodiment 5
[0065] The 70 μm thick transparent high-barrier film prepared in Example 1 was combined with the 12 μm thick PET film to obtain a composite film; the performance test of the composite film was performed, and the results are shown in Table 4, which is provided for the embodiments of the present invention and comparative examples. Performance test results of the composite membrane.
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Abstract
The invention relates to a seven-layer coextruded high-barrier transparency film and a preparation method thereof. The high-barrier transparency film comprises a first polyethylene layer, a second polyethylene layer, a first adhesive resin layer, a ethylene-vinyl alcoholcopolymer layer, a second adhesive resin layer, a third polyethylene layer and a forth polyethylene layer which sequentially contact. The preparation method comprises the steps of: carrying out coextrusion and formation on polyethylene, adhesive resin and ethylene-vinyl alcoholcopolymer to obtain a hot meltpipe comprising the first polyethylene layer, the second polyethylene layer, the first adhesive resin layer, the ethylene-vinyl alcoholcopolymer layer, the second adhesive resin layer, the third polyethylene layer and the forth polyethylene layer which sequentially contact; carrying out blow molding filming and cooling sizing on the hot meltpipe; and carrying out corona treatment on the outer surface of the film which is cooled and sized to obtain the high-barrier transparency film. The high-barrier transparency film provided by the invention has good transparency, good mechanical strength, good oxygen-barrier property, good moisture barrier property, and good low-temperature heat sealability, and has better flatness.
Description
technical field [0001] The invention belongs to the technical field of packaging materials, in particular to a 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 oxygentransmission rate is less than 5ml / m 2 ·Less than one day, water vaportransmission rate <2g / m 2 d. [0003] The traditional high-barrier film is usually m...
Claims
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