A high-strength five-layer co-extrusion composite film and its preparation method

A co-extruded composite film, high-strength technology, applied in the direction of chemical instruments and methods, layered products, flat products, etc., can solve the problems of co-extruded film strength, poor tear resistance, poor appearance quality, unsatisfactory overall uniformity of the film, Poor production stability and other problems, to improve the heat sealing effect, improve the overall tensile strength, and eliminate the effect of cohesion

Active Publication Date: 2019-09-20
杭州巨杰包装科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing five-layer co-extrusion film is usually processed by casting process using PP, PE, EVOH and other materials. The casting process is greatly affected by process equipment, material performance, external environment, process parameters, etc., and the production stability is poor. , resulting in poor strength, tear resistance and appearance quality of the produced co-extruded film
However, the composite co-extrusion film made of metal aluminum foil, kraft paper and other materials, due to the incompatibility of materials, leads to unsatisfactory overall uniformity of the formed film, poor local strength, poor toughness, high production cost, and difficulty in waste recycling. Great harm to the environment
Patent No. "201510008519.9" introduces a polyamide five-layer co-extruded composite film and its preparation method, which is modified with silicone and can be used in solar panels, insulators and other fields, but its preparation method uses multiple extruders to extrude separately , the process is cumbersome and the production efficiency is low
Therefore, the existing co-extruded film material and production process need to be further improved

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] a) LDPE, MDPE, LLDPE, PP, PA6, PA10 raw material particles with a purity greater than 99.5% are weighed according to the different weight ratios of each layer, and then put into the funnel-type circulating air mixer for 3 minutes, and discharged. use;

[0027] b) Put the above-mentioned uniformly mixed ingredients particles around the film blowing machine. The PA material particles of the third layer should be placed in a dry environment to avoid water absorption and denaturation. The co-extruded film is automatically fed according to the requirements of each layer. A layer of formulated plastic particles is added with 1000 mesh talc powder with a ratio of 0.5%, and is located at the bottom, successively upwards into two, three, four, and five layers, which are extruded by a screw and heated and melted and blown upward into a film. The melting temperature is 200°C, the second and fourth layers are adhesive layers, and the first, third and third and fifth layers are bonded ...

Embodiment 2

[0032] a) LDPE, MDPE, LLDPE, PP, PA6, PA10 raw material particles with a purity greater than 99.5% are weighed according to the different weight ratios of each layer, and then put into a funnel-type circulating air mixer for mixing for 5 minutes, and discharged. use;

[0033] b) Put the above-mentioned uniformly mixed ingredients particles around the film blowing machine. The PA material particles of the third layer should be placed in a dry environment to avoid water absorption and denaturation. The co-extruded film is automatically fed according to the requirements of each layer. A layer of formulated plastic particles is added with 1000 meshes of talc powder with a ratio of 1.0%, and is located at the bottom, successively upwards into two, three, four, and five layers, which are extruded by a screw and heated and melted and blown upward into a film. The melting temperature is 220°C, the second and fourth layers are adhesive layers, and the first, third and third and fifth laye...

Embodiment 3

[0038] a) LDPE, MDPE, LLDPE, PP, PA6, PA10 raw material particles with a purity greater than 99.5% are weighed according to the different weight ratio requirements of each layer, and then put into a funnel-type circulating air mixer for mixing for 10 minutes, and discharged. use;

[0039] b) Put the above-mentioned uniformly mixed ingredients particles around the film blowing machine. The PA material particles of the third layer should be placed in a dry environment to avoid water absorption and denaturation. The co-extruded film is automatically fed according to the requirements of each layer. A layer of formula plastic particles is added with 1000 mesh talc powder with a ratio of 1.5%, and is located at the bottom, successively upwards into two, three, four, and five layers, which are extruded by a screw and heated and melted and blown upward into a film. The melting temperature is 250°C, the second and fourth layers are bonding layers, bonding the first, third and third and fi...

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Abstract

The invention belongs to the technical field of composite package films and in particular relates to a high-strength five-layer coextruded composite film and a preparation method of the coextruded composite film. The high-strength five-layer coextruded composite film provided by the invention is prepared through coextruding, blowing and compounding LDPE (Low Density Polyethylene), MDPE (Medium Density Polyethylene), LLDPE (Linear Low Density Polyethylene), PP (Polypropylene), PA6 (Polyamide 6) and PA10 (Polyamide 10) raw material particle combinations, wherein a first layer is formed by mixing the LDPE, the MDPE and the LLDPE according to the weight ratio ranging from (1 to 1 to 1) to (1 to 1 to 2); a second layer is formed by mixing the LLDPE and the PP according to the weight ratio ranging from (5 to 1) to (5 to 2); a third layer is formed by mixing the PA6 and the PA10 according to the weight ratio ranging from (5 to 4) to (5 to 5); a fourth layer is formed by mixing the LLDPE and the PP according to the weight ratio ranging from (5 to 1) to (5 to 2); a fifth layer is formed by mixing the LDPE, the MDPE and the LLDPE according to the weight ratio ranging from (1 to 1 to 1) to (1 to 1 to 2); the preparation method adopts a one-step-method co-extrusion molding process; a funnel type circulating airflow material mixer is used for replacing an original manual or mechanical stirring rod to mix materials, so that the material mixing uniformity of raw material particles is greatly improved; the prepared five-layer coextruded composite film has good whole uniformity, high strength and good toughness and can be widely used for the production field of air column bags; meanwhile, formula materials used by the preparation method have the advantages of greenness and environment friendliness, recyclability, short decomposition period and the like.

Description

Technical field [0001] The invention belongs to the technical field of composite packaging films, and specifically relates to a high-strength five-layer co-extruded composite film and a preparation method of the co-extruded composite film. Background technique [0002] Since the 1970s, with the development of co-extrusion composite molding technology and co-extrusion equipment, traditional packaging materials are gradually being replaced by plastic packaging materials, especially in recent years, the development of multilayer composite materials has been particularly rapid, and its material properties have It can meet the standards of resistance to cooking, baking and low temperature freezing. Some varieties have protective functions such as gas barrier (oxygen, carbon dioxide), shading, and moisture resistance, making multi-layer co-extrusion composite films popular in the packaging and food industries , Has achieved considerable development, and its market prospects are widely ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/08B32B27/18B32B27/32B32B7/12B29C48/08B29C48/21B29L7/00B29L9/00
Inventor 齐志平易绍财易田田
Owner 杭州巨杰包装科技有限公司
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