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Heat-shrinkable polyester film, process for production thereof, and package

A manufacturing method and heat-shrinking technology, which are applied in packaging, wrapping paper, wrapping paper shrinkage, etc., can solve the problems that it is difficult to obtain heat-shrinkable polyester film and cannot effectively manufacture heat-shrinkable polyester film, and achieve sewing Good eye opening, good tearing, efficient production

Active Publication Date: 2009-11-04
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] If the method of mixing an immiscible thermoplastic resin into the main raw material of the heat-shrinkable polyester film is used as in the above-mentioned Patent Document 1, although the seam-eye unsealability of the heat-shrinkable polyester film is improved to some extent, However, it is difficult to obtain a heat-shrinkable polyester film with sufficient seam eye opening properties
In addition, even when a method like Patent Document 1 is used, it can only be stretched in the width direction at the time of production, so the heat-shrinkable polyester film cannot be efficiently produced.

Method used

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  • Heat-shrinkable polyester film, process for production thereof, and package
  • Heat-shrinkable polyester film, process for production thereof, and package
  • Heat-shrinkable polyester film, process for production thereof, and package

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0188] The polyester A, polyester A2, polyester B and polyester D were mixed in a weight ratio of 5:5:80:10 and put into an extruder. Then, this mixed resin was melted at 280° C., extruded from a T die, wound on a rotating metal roll whose surface temperature was cooled to 30° C., and quenched to obtain an unstretched film with a thickness of 580 μm. The take-up speed (rotation 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 67°C.

[0189] Next, the unstretched film obtained as described above is guided to a longitudinal stretching machine in which a plurality of roll groups are continuously arranged, and stretched in the longitudinal direction in two stages by utilizing the difference in the rotational speed of the rolls. That is, after preheating the unstretched film on the preheating roll until the film temperature becomes 78°C, between the low-speed rotating roll whose surface temperature is set...

Embodiment 2

[0194] Mix the polyester A, polyester A2, polyester B, polyester C and polyester D in a weight ratio of 5:5:15:65:10, and put them into an extruder. Then, the mixed resin was melt-extruded under the same conditions as in Example 1, thereby forming an unstretched film. The Tg of the unstretched film was 67°C. By producing this unstretched film under the same conditions as in Example 1, a biaxially stretched film of about 40 μm was continuously produced with a width of 500 mm. Next, the properties of the obtained film were evaluated by the same method as in Example 1. Table 3 shows the evaluation results.

Embodiment 3

[0196] Mix the polyester A, polyester A2, polyester C and polyester D in a weight ratio of 5:5:80:10, and put them into an extruder. Then, the mixed resin was melt-extruded under the same conditions as in Example 1, thereby forming an unstretched film. The Tg of the unstretched film was 67°C. By producing this unstretched film under the same conditions as in Example 1, a biaxially stretched film of about 40 μm was continuously produced with a width of 500 mm. Next, the properties of the obtained film were evaluated by the same method as in Example 1. Table 3 shows the evaluation results.

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Abstract

The present invention provides a heat-shrinkable polyester film which can be easily torn along perforations and which exhibits extremely high productivity. The heat-shrinkable polyester film made from a polyester resin which comprises ethylene terephthalate units as the main constituent and contains at least 15% by mole of units derived from at least one monomer capable of forming a non-crystalline component based on the whole polyester resin and which exhibits specific heat shrinkage characteristics and specific mechanical characteristics after the heat shrinkage.

Description

technical field [0001] The present invention relates to a heat-shrinkable polyester film, a method for producing the same, and a package, and more specifically, to a heat-shrinkable polyester film suitable for label use, a method for producing the same, and a package using a label. Background technique [0002] In recent years, polyvinyl chloride-based resins, polystyrene-based resins, Stretched films (so-called heat-shrinkable films) made of polyester-based resins and the like are widely used. Among such heat-shrinkable films, the polyvinyl chloride-based film has problems such as low heat resistance, generation of hydrogen chloride gas during combustion, or a cause of dioxin. In addition, polystyrene-based films have to use special inks for printing due to their poor solvent resistance, and they must be burned at high temperatures. Excessive black smoke will be produced along with peculiar smells during burning. Therefore, polyester-based heat-shrinkable films that are h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18G09F3/04B29C55/14B29K67/00B29C61/06B29L7/00B65B53/00
CPCB65B53/02B29C61/003C08J5/18B29K2995/0049B29C55/143B29C55/065C08J2367/02B29K2067/00B29L2031/744Y10T428/1328Y10T428/24479C08L67/00B65D65/00
Inventor 春田雅幸多保田规野濑克彦
Owner TOYOBO CO LTD
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