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Heat sealing film and preparation method thereof

A heat-sealing film, metallocene polypropylene technology, applied in chemical instruments and methods, flexible coverings, packaging, etc., can solve the problems of low sealing strength and high heat-sealing temperature of heat-sealing films, and achieve reduced packaging difficulty and low heat. The effect of sealing temperature and good compatibility

Active Publication Date: 2011-10-26
HUANGSHAN NOVEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The heat-sealing film is directly sealed to polypropylene by metallocene polyethylene, which can save raw materials, but the heat-sealing temperature of the obtained heat-sealing film is high and the sealing strength is low

Method used

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  • Heat sealing film and preparation method thereof
  • Heat sealing film and preparation method thereof
  • Heat sealing film and preparation method thereof

Examples

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preparation example Construction

[0059] The present invention also provides a method for preparing a heat-sealing film, comprising the following steps:

[0060] Co-extruding polyethylene, metallocene ethylene propylene copolymer and polypropylene to obtain a hot-melt pipe comprising a first polyethylene layer, a first metallocene polypropylene layer and a polypropylene layer in sequential contact;

[0061] Blow molding the hot-melt pipe into a film, cooling and setting;

[0062] Corona treatment is performed on the outer surface of the film after cooling and setting to obtain a heat-sealing film.

[0063] The invention adopts a co-extrusion blow molding process to prepare the heat-sealing film, and the production process is relatively simple.

[0064] First, the raw material resins that form the first polyethylene layer, the first metallocene polypropylene layer and the polypropylene layer, namely polyethylene, metallocene ethylene propylene copolymer and polypropylene, are fed into a screw extruder for co-e...

Embodiment 1

[0076] The seven-layer co-extrusion upper blow molding equipment produced by German W&H company, the model is VAREX, is used for the preparation of heat-sealing film:

[0077] Add the first mixed polyethylene layer raw material (denoted as Y1), the first linear low density polyethylene layer raw material (denoted as Y2), the first metallocene polythene layer raw material (denoted as Y2) and the first metallocene polythene The propylene layer raw material (denoted as Y3), the polypropylene layer raw material (denoted as Y4), the second metallocene polypropylene layer raw material (denoted as Y5), the second linear low density polyethylene layer raw material (denoted as Y6) and the second Mix polyethylene layer raw materials (denoted as Y7), and the specific formula of each raw material is shown in Table 1.

[0078] Table 1 Example 1 preparation of each layer of the heat-sealing layer raw material formula used

[0079]

[0080]The raw materials in the seven barrels were co-e...

Embodiment 2

[0085] A heat-sealing film with a thickness of 70 μm was prepared according to the method and equipment provided in Example 1. The difference is that the specific formula of each raw material is shown in Table 4.

[0086] Table 4 The formula of raw materials used for each layer of the heat-sealing layer prepared in Example 2

[0087]

[0088] The heat-sealing performance test was carried out on the heat-sealing film, and the results are shown in Table 2. Table 2 shows the heat-sealing performance test results of the heat-sealing films provided in the examples and comparative examples of the present invention.

[0089] The heat-sealing film was composited with a PET film with a thickness of 12 μm to obtain a composite film, and the heat-sealing performance test was carried out on the composite film. The results are shown in Table 3. Table 3 shows the properties of the composite films provided by the embodiments of the present invention and comparative examples. Heat sealing ...

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Abstract

The invention provides a heat sealing film. The film comprises a first polyethylene layer, a first metallocene polypropylene layer and a polypropylene layer which contact in sequence, wherein the first metallocene polypropylene layer comprises not less than 25% by mass of a metallocene ethylene-propylene copolymer. The invention also provides a preparation method of the heat sealing film. The preparation method comprises the following steps: carrying out extrusion molding on polyethylene, the metallocene ethylene-propylene copolymer and polypropylene to obtain a hot melt tube containing the first polyethylene layer, the metallocene polypropylene layer and the polypropylene layer which contact in sequence; blow molding the hot melt tube into the film, and cooling and shaping; and carrying out corona processing on an outer surface of the cooled and shaped film to obtain the heat sealing film. The heat sealing film with good performances can be obtained through controlling the thickness of the heat sealing film provided by the present invention in a thin scope, so the packing difficulty is reduced and the packing speed is improved.

Description

technical field [0001] The invention belongs to the technical field of packaging materials, in particular to a heat-sealing film and a preparation method thereof. Background technique [0002] Heat-sealing bags are widely used in daily chemical product packaging, food and drug packaging and other fields. Since leakage is most likely to occur at the heat-sealed part of the packaging bag when the product is filled, and the damage of the packaging bag also occurs in the heat-sealed part during actual use, therefore, choosing the appropriate heat-sealing film and heat-sealing parameters can reduce the scrap rate of the production line, And can effectively improve the overall barrier performance of the package. [0003] Currently commonly used heat-sealing films are polyethylene (PE) films or polypropylene (PP) films. The PP film used as a heat-sealing film is mainly a copolymerized polypropylene film formed by copolymerization of propylene and 5% to 7% ethylene, which has good...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/32B65D65/40
Inventor 江继忠崔鹏鲍祖本潘健郝文涛
Owner HUANGSHAN NOVEL
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