Unlock instant, AI-driven research and patent intelligence for your innovation.

Low shrink polyester films and method of making

A polyester film, polyester technology, used in chemical instruments and methods, flat products, other household appliances, etc., can solve problems such as damage to the flatness of the film, film buckling, etc.

Active Publication Date: 2018-08-31
3M INNOVATIVE PROPERTIES CO
View PDF9 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is well known that thermal relaxation of such membranes leads to buckling of the membrane in the cross-web direction, thereby destroying the desired flattening properties of the membrane.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Low shrink polyester films and method of making
  • Low shrink polyester films and method of making
  • Low shrink polyester films and method of making

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0022] figure 1 is a schematic diagram of an exemplary embodiment of the method of the present invention comprising the steps of:

[0023] (a) providing a treatment assembly 100 comprising two or more polyester films;

[0024] (b) biaxially orienting 200 the processing assembly; then

[0025] (c) heat setting 300 the treatment assembly; and then

[0026] (d) thermally relaxing 400 the processing component; and

[0027] (e) Optionally detaching the individual polyester layer 500 from the processing assembly.

[0028] The process of the present invention requires the sequential treatment of polyester films at many different temperatures and conditions of dimensional tension or stress. Temperature conditions are referred to herein as the following:

[0029] T g

Glass transition temperature of polyester in polyester film.

T 取向

The orientation temperature refers to the temperature of the polyester film during biaxial orientation.

T 使用

The use...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
thicknessaaaaaaaaaa
Login to View More

Abstract

A method for making low shrink polyester films wherein the films are arranged in stacks, tentered, heat treated, and relaxed in unison. Also, polyester films produced by such method.

Description

technical field [0001] The present invention relates to dimensionally stable oriented polyester films (ie, they exhibit low shrinkage when subjected to high temperatures) and methods of making such films. Background technique [0002] Polyester films are typically oriented to impart desired properties to the film (eg, tendency to undergo heat-induced shrinkage, increased tensile strength, increased impact strength, etc.). Orientation is usually performed by a heating and stretching scheme. The film can be oriented in a single axial dimension, such as in the transverse or machine direction (i.e., uniaxially oriented), or in two typically perpendicular axial dimensions, such as in both the transverse and machine directions (i.e., biaxially oriented). orientation). [0003] Oriented films generally exhibit a tendency to shrink when subjected to significant elevated temperatures. It is known that treating an oriented film with thermal relaxation (ie, heating to a temperature ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B29D7/01B29C55/10B32B7/06B32B27/08C08J5/18
CPCB29D7/01B32B7/06B32B27/08B29C55/12B32B25/08B32B25/16B32B27/32B32B27/36B32B2250/24B32B2270/00B32B2307/50B32B2307/518B32B2307/732B32B2307/734B32B2307/736B32B2307/748B32B2307/514B32B2307/30B32B7/035B29C35/045B29C55/005B29C55/023B29C55/14B29C55/16B29C2035/046B29K2067/00B29L2007/008B29L2009/00B32B25/14B32B38/0012
Inventor 约翰·P·珀塞尔詹姆斯·B·什瓦哈斯蒂芬·A·约翰逊蒂莫西·J·林德奎斯特格兰特·F·蒂芬布鲁克查德·R·沃尔德
Owner 3M INNOVATIVE PROPERTIES CO