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Preparation method of multilayer co-extruded biaxially stretched composite film

A composite film, biaxial stretching technology, applied in the direction of flat products, household appliances, other household appliances, etc., can solve the problems of low production speed, unbalanced performance, low flexibility, etc.

Active Publication Date: 2019-09-03
KUSN JIAPU PACKING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Flat film biaxial stretching includes synchronous stretching method and two-step stretching method. The film produced by synchronous stretching method has uniform performance and non-contact stretching, but the mechanical structure of the production equipment is complicated, the flexibility is low, and the production speed is low. ; The film produced by the two-step stretching method has excellent flexibility, good thickness uniformity and low shrinkage, but the performance is uneven

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] A method for preparing a multilayer co-extruded biaxially stretched composite film, wherein the composite film contains a main stretch layer, the material of the main stretch layer is PET, and the thickness of the main stretch layer accounts for 38% of the total thickness of the composite film.

[0060] For the composite film, it is prepared by combining the simultaneous stretching of the tubular film method and the two-step stretching of the flat film method, specifically: firstly, the longitudinal and transverse extrusion of the extruded film bubble is carried out by the co-extrusion tubular film forming process. Simultaneously melt and stretch for the first time to obtain a tubular film, and then fold the tubular film flat to obtain a double-layer film or a single-layer film. At the glass transition temperature of the material, a double-layer diaphragm is obtained, and when the temperature of the inner material of the extruded bubble is higher than the melting point o...

Embodiment 2

[0068] A method for preparing a multilayer co-extruded biaxially stretched composite film, wherein the composite film contains a main stretch layer, the material of which is PE, and the thickness of the main stretch layer accounts for 50% of the total thickness of the composite film.

[0069] For the composite film, it is prepared by combining the simultaneous stretching of the tubular film method and the two-step stretching of the flat film method, specifically: firstly, the longitudinal and transverse extrusion of the extruded film bubble is carried out by the co-extrusion tubular film forming process. Simultaneously melt and stretch for the first time to obtain a tubular film, and then fold the tubular film flat to obtain a double-layer film or a single-layer film. At the glass transition temperature of the material, a double-layer diaphragm is obtained, and when the temperature of the inner material of the extruded bubble is higher than the melting point of the material, a ...

Embodiment 3

[0077] A method for preparing a multilayer co-extruded biaxially stretched composite film, wherein the composite film contains a main stretch layer, the material of the main stretch layer is PP, and the thickness of the main stretch layer accounts for 45% of the total thickness of the composite film.

[0078] For the composite film, it is prepared by combining the simultaneous stretching of the tubular film method and the two-step stretching of the flat film method, specifically: firstly, the longitudinal and transverse extrusion of the extruded film bubble is carried out by the co-extrusion tubular film forming process. Simultaneously melt and stretch for the first time to obtain a tubular film, and then fold the tubular film flat to obtain a double-layer film or a single-layer film. At the glass transition temperature of the material, a double-layer diaphragm is obtained, and when the temperature of the inner material of the extruded bubble is higher than the melting point of t...

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PUM

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Abstract

The invention relates to a preparation method of a multilayer co-extruded biaxially-oriented composite membrane. The membrane is prepared by adopting a mode combining synchronous stretching of the tube membrane method and two-step stretching of the flat membrane method. The mode specifically comprises the following steps: carrying out first melt stretching in the transverse direction and the longitudinal direction through tube membrane synchronous stretching by adopting a co-extrusion tube membrane method forming technology at first so as to obtain tubular membrane bubble; then flatly folding the tubular membrane bubble to obtain a double-layer membrane or a single-layer membrane; then carrying out pretreatment on the double-layer membrane or the single-layer membrane; then carrying out longitudinal second non-melt stretching on the double-layer membrane or the single-layer membrane through a flat membrane stretching method; then carrying out transverse third non-melt stretching through the flat membrane stretching method on the double-layer membrane or the single-layer membrane subjected to the longitudinal second non-melt stretching; and finally, carrying out post treatment on the double-layer membrane or the single-layer membrane, and thus the biaxially-oriented composite membrane is obtained.

Description

technical field [0001] The invention relates to a preparation method of a multilayer co-extruded biaxially stretched composite film. Background technique [0002] Tube-film synchronous stretching and flat-film biaxial stretching are two commonly used biaxially stretched plastic film production processes, both of which have their own advantages and disadvantages. [0003] The simultaneous stretching of the tubular film method completes the longitudinal and transverse bidirectional stretching of the film when the tubular film bubble is formed by inflation. The principle of this method is to extrude a tubular object first, and then cool the tubular object with a water bath. Between the first and second pair of nip rollers, the transverse stretching is formed by properly adjusting the air pressure state in the film bubble, and the longitudinal stretching is This is achieved by adjusting the speed difference between the first and second pair of nip rollers. The stretched film p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C55/26B29C55/14B29L7/00
Inventor 夏嘉良高学文夏琪
Owner KUSN JIAPU PACKING MATERIAL