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A kind of preparation method of multi-layer co-extruded biaxially stretched composite film

A composite film and two-way stretching technology, which is applied in the direction of flat products, household utensils, and other household utensils, can solve the problems of resin bonding, low shrinkage, inaccurate control of temperature and stretch ratio, etc.

Active Publication Date: 2020-01-07
KUSN JIAPU PACKING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The stretched film produced by the tubular film stretching method has uniform performance, but the shrinkage rate is low, the thickness is uneven, the temperature and stretch ratio cannot be accurately controlled, and the resin with low heat sealing temperature will have bonding problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A method for preparing a multilayer co-extruded biaxially stretched composite film. The composite film contains a main stretched layer, the material of the main stretched layer is PET, and the thickness of the main stretched layer accounts for 38% of the total thickness of the composite film.

[0056] For the composite film, the secondary synchronous stretching method combining the simultaneous stretching of the tube film method and the simultaneous stretching of the flat film method is used to prepare the composite film. Specifically, the co-extrusion tube film method is used to form the extruded bubble. The longitudinal and transverse directions are synchronized for the first time to melt and stretch to obtain a tubular film, and then the tubular film is folded flat to obtain a double-layer film or a single-layer film. In the flat folded state, when the inner layer material of the bubble is extruded When the temperature reaches or falls below the glass transition temperat...

Embodiment 2

[0063] A method for preparing a multi-layer co-extruded biaxially stretched composite film. The composite film contains a main stretched layer, the material of the main stretched layer is PE, and the thickness of the main stretched layer accounts for 50% of the total thickness of the composite film.

[0064] For the composite film, the secondary synchronous stretching method combining the simultaneous stretching of the tube film method and the simultaneous stretching of the flat film method is used to prepare the composite film. Specifically, the co-extrusion tube film method is used to form the extruded bubble. The longitudinal and transverse directions are synchronized for the first time to melt and stretch to obtain a tubular film, and then the tubular film is folded flat to obtain a double-layer film or a single-layer film. In the flat folded state, when the inner layer material of the bubble is extruded When the temperature reaches or falls below the glass transition temperat...

Embodiment 3

[0071] A method for preparing a multi-layer co-extruded biaxially stretched composite film. The composite film contains a main stretched layer, the material of the main stretched layer is PP, and the thickness of the main stretched layer accounts for 45% of the total thickness of the composite film.

[0072] For the composite film, the secondary synchronous stretching method combining the simultaneous stretching of the tube film method and the simultaneous stretching of the flat film method is used to prepare the composite film. Specifically, the co-extrusion tube film method is used to form the extruded bubble. The longitudinal and transverse directions are synchronized for the first time to melt and stretch to obtain a tubular film, and then the tubular film is folded flat to obtain a double-layer film or a single-layer film. In the flat folded state, when the inner layer material of the bubble is extruded When the temperature reaches or falls below the glass transition temperat...

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PUM

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Abstract

The invention relates to a preparation method of a multi-layer coextrusion two-way stretching composite film. A coextrusion tube film method forming process is firstly adopted for carrying out synchronous first-time melting stretching on the longitudinal direction and the transverse direction of extrusion film bubbles, and a tubular film is obtained; then the tubular film is flatly folded to obtain a dual-layer film piece or a single-layer film piece; then the dual-layer film piece or the single-layer film piece is pretreated; a flat film method is adopted for synchronous stretching, and meanwhile synchronous second-time non-melting stretching in the longitudinal direction and the transverse direction is carried out on the dual-layer film piece or the single-layer film piece; and finally the dual-layer film piece or the single-layer film piece is subjected to aftertreatment, and therefore the multi-layer coextrusion two-way stretching composite film uniform in thickness and designableand controllable in stretching ratio, shrinking percentage and related character is obtained.

Description

Technical field [0001] The invention relates to a method for preparing a multilayer co-extruded biaxially stretched composite film. Background technique [0002] Tube-film simultaneous stretching and flat-film bidirectional stretching are two commonly used biaxially stretched plastic film production processes, each of which has its own advantages and disadvantages. [0003] When the tube film method is simultaneously stretched to form a tubular bubble through inflation, the film is stretched in both directions in the longitudinal and transverse directions. The principle of this method is to extrude a tube first, and then cool the tube in a water bath. Between the first and second pair of clamping rods, the transverse stretch is formed by appropriately adjusting the air pressure state in the film bubble, and the longitudinal stretch is It is achieved by adjusting the speed difference between the first and second pair of nip rollers. The stretched film produced by the tube film str...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C69/02B29C55/26B29C55/14B29L7/00
CPCB29C55/143B29C55/26B29C69/02B29L2007/002
Inventor 夏嘉良高学文夏琪
Owner KUSN JIAPU PACKING MATERIAL