Heat-shrinkable polyester film and process for producing the same

A manufacturing method and heat-shrinking technology, which can be used in thin material processing, flat products, and other household appliances, etc., can solve the problems of low mechanical strength and easy breakage, and achieve the effect of high shrinkage characteristics

Inactive Publication Date: 2010-12-15
TOYOBO CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to assemble a label formed of a heat-shrinkable film thermally shrunk in the width direction into a cylindrical body at high speed.
Therefore, recently, a film that can be directly mounted around a cylindrical body from a film roll (so-called body winding) and heat-shrinkable in the longitudinal direction is sought, but stretching is only performed in the width direction as in Patent Document 1. thin films cannot cope with such demands
[0006] In addition, since the film stretched only in the width direction as in Patent Document 1 has low mechanical strength in the longitudinal direction, it is also prone to breakage during processing.

Method used

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  • Heat-shrinkable polyester film and process for producing the same
  • Heat-shrinkable polyester film and process for producing the same
  • Heat-shrinkable polyester film and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0112] The above-mentioned polyester 1 and polyester 2 were mixed at a weight ratio of 75:25, and charged into an extruder. Then, the mixed resin was melted at 280° C., extruded from a T die, wound on a rotating metal roll cooled to a surface temperature of 30° C., and quenched to obtain an unstretched resin with a thickness of 200 μm. film. The take-up speed (rotational speed of the metal roll) of the unstretched film at this time was about 20 m / min. In addition, Tg of the unstretched film was 76°C. Then, the unstretched film was guided to a tenter (first tenter) in which a transverse stretching zone, an intermediate zone, and an intermediate heat treatment zone were successively provided. In addition, in this tenter, the length of the intermediate region located between the transverse stretching region and the intermediate heat treatment region was set to about 40 cm. In addition, in the middle region, when the elongated paper sheet is hung down without passing the film, ...

Embodiment 2

[0117] In the same manner as in Example 1 except that the final heat treatment temperature in the second tenter was changed to 135°C, a biaxially stretched film (heat-shrinkable film) of about 30 μm was obtained. Winding film rolls. In addition, the properties of the obtained thin film were evaluated by the method described above. The evaluation results are shown in Table 3.

Embodiment 3

[0119] Except that the transverse draw ratio in the first tenter was changed to 3.7 times, and the final heat treatment temperature in the second tenter was changed to 130° C., by the same method as in Example 1, the obtained A film roll in which a biaxially stretched film (heat-shrinkable film) of about 30 μm is wound through a predetermined length. In addition, the properties of the obtained thin film were evaluated by the method described above. The evaluation results are shown in Table 3.

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Abstract

Provided is a heat-shrinkable polyester film whose main shrinkage direction is the machine direction. This film does not shrink in the machine direction in a low-temperature region and, despite this, highly shrinks in a high-temperature region. The film has an extremely high mechanical strength in the transverse direction, which is perpendicular to the main shrinkage direction. The film is suitable for use especially as a film for forming covering labels for dry cells and in applications similar thereto. The heat-shrinkable polyester film shrinks mainly in the machine direction. The film has been regulated so that the degree of machine-direction hot-water thermal shrinkage through 10-second immersion in 80 DEG C water is in a given range and the degree of machine-direction thermal shrinkage and degree of transverse-direction thermal shrinkage through 10-second immersion in a 140 DEG C glycerol bath are in respective given ranges.

Description

technical field [0001] The present invention relates to a heat-shrinkable polyester film and a method for producing the same, and more particularly to a heat-shrinkable polyester film suitable for a label for the exterior of a dry battery or the like, and a method for producing the same. Background technique [0002] In recent years, heat-shrinkable polyester films have been widely used in applications such as labels and packages that improve the appearance of PET bottles and glass containers, and that protect the contents and display products at the same time. The above-mentioned heat-shrinkable polyester film is required to be largely shrunk in the width direction, so it is often produced mainly by stretching only in the width direction (Patent Document 1). [0003] Patent Document 1: Japanese Unexamined Patent Publication No. 9-239833 [0004] Recently, a heat-shrinkable polyester film laminated with a heat-sensitive adhesive has been used for the appearance of dry batte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C61/06B29L7/00B29C55/14C08J5/18B29K67/00B29K105/02
CPCB29C61/003C08J5/18B29K2995/0049C08J2367/02B29K2067/00B29C55/14Y10T428/1328
Inventor 远藤卓郎桥本正敏野濑克彦
Owner TOYOBO CO LTD
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