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Thermo-shrinkable polyester film

A heat-shrinkable polyester film technology, applied in the field of polyester film, can solve problems such as poor printing status, reduced yield, and defective label appearance

Active Publication Date: 2010-12-08
KOLON IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In practice, however, the label may warp, or lose its shape
[0009] This phenomenon occurs because the label or the like shrinks unevenly at a given temperature for a predetermined period of time
Different degrees of shrinkage, i.e. non-uniformity of shrinkage, lead to defects in the appearance of said labels and, in severe cases, to poor printing conditions
[0010] Non-uniformity in shrinkage hinders the shrinking process and reduces yield

Method used

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Examples

Experimental program
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Embodiment Construction

[0061] Shrinkable films are manufactured based on the principle that low-temperature uniaxial stretching enables maximum uniaxial orientation and also prevents the release of residual stress due to heat treatment, so that the uniaxially oriented molecular chains can maintain this residual Stress, and then shrink under the action of said residual stress during the last shrinkage process.

[0062] Shrinkable polyester films are generally obtained by extrusion of copolyester-containing compositions. The problem with copolyester, on its own, is that it is very poorly resistant to heat.

[0063] Since the material has this problem, the heat-shrinkable polyester film has low heat resistance.

[0064] According to an embodiment of the present invention, the shrinkage start temperature of the heat-shrinkable polyester film in the main shrinkage direction is 72-88° C., wherein the shrinkage start temperature is defined as, when kept at room temperature and under a predetermined initia...

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Abstract

Disclosed is a thermo-shrinkable polyester film in which shrinkage uniformity is ensured in a shrinking process thus realizing superior quality of the outer appearance without causing a poorly printed state, reducing the production cost of the shrinking process and improving the productivity.

Description

technical field [0001] The present invention relates to a polyester film having heat-shrinkable properties. Background technique [0002] Heat-shrinkable films are used as packaging materials or labels to trap, bind, or wrap various containers including bottles, cans, etc., and long objects including pipes, rods, etc., and are mainly made of polyester. [0003] The heat-shrinkable film is used to shrink (cumulatively) various containers including, for example, polyethylene terephthalate (PET) containers, polyethylene (polyethylene) containers, glass containers, etc., utilizing its heat shrinkability. Packaging, shrink labels and lidding. [0004] For the manufacture of labels and the like, a polymer material is continuously melted and extruded to produce an unstretched film, which is then stretched to form a roll of heat-shrinkable film. The film in the roll is unrolled, cut to the desired width, and wound into a roll. Subsequently, various characters and patterns includi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08G63/02B29C48/08
CPCB29C61/003C08J5/18B29K2995/0049C08J2367/02B29C55/08B29K2067/00C08L67/02B29C55/06C08G63/127C08G63/137C08G63/189C08G63/18C08G63/183C08G63/199C08G63/123C08G63/181C08G63/12C08G63/16C08G63/13C08L67/03B32B27/36B32B2307/516B32B2307/736B32B2367/00B32B2307/514B29C55/12B29C55/04B29C55/005B29C55/02B29C55/10B29D7/01B29C48/08B29C48/0018
Inventor 金允照尹灿硕李省昊金时敏
Owner KOLON IND INC
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