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Void-containing heat-shrinkable polyester-based film

A heat-shrinking, film technology, applied in rigid containers, thin material processing, flexible coverings, etc., can solve the problems of high light transmittance, uncomfortable content protection, etc., to achieve excellent appearance, good shrinkage processability, amorphous The effect of small difference in raw materials

Active Publication Date: 2018-11-23
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, general heat-shrinkable polyester films are transparent, so they have high light transmittance and are not suitable for protecting the contents.

Method used

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  • Void-containing heat-shrinkable polyester-based film
  • Void-containing heat-shrinkable polyester-based film
  • Void-containing heat-shrinkable polyester-based film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0173] 5% by weight of polyester a, 75% by weight of polyester b, and 20% by weight of polyester c are mixed as layer A, and 65% by weight of polyester b and 15% by weight of polyester c are mixed as layer B. , raw material e 20% by weight of polyester, as layer C mixed with 5% by weight of polyester a, 75% by weight of polyester b, and 20% by weight of polyester c, layer A and layer C were heated at 265°C Melt, melt the B layer at 280°C, and co-extrude from the T die in such a way that the layer thickness ratio becomes A layer / B layer / C layer = 20 / 60 / 20. cold to obtain an unstretched multilayer film with a thickness of 200 μm. The temperature of the cooling roll at this time was 25 degreeC, and it contacted with layer A. To the layer C opposite to the cooling roll, a multiduct was used to blow cold air at 10° C. at a rate of 8 m / S at the center and at 10 m / S at the ends.

[0174] This unstretched film was preheated until the film temperature became 80° C., and then stretche...

Embodiment 2

[0177] Except having changed the raw material e of B layer into raw material f, the heat-shrinkable polyester film containing a hole was obtained by the method similar to Example 1. Table 3 shows the evaluation results of the obtained film. A film with good shrinkage processability was obtained.

Embodiment 3

[0179] The discharge rate of the extruder was changed, and co-extrusion was carried out from the T die head so that the layer thickness ratio became A layer / B layer / A layer=30 / 40 / 30, and it was quenched on a cooling (chilling) roll, and changed to A void-containing heat-shrinkable polyester film was obtained in the same manner as in Example 1 except for an unstretched multilayer film having a thickness of 200 μm. Table 3 shows the evaluation results of the obtained film. Glossiness and apparent specific gravity were increased, but a film with good shrinkage processability was obtained.

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Abstract

To provide a void-containing heat-shrinkable polyester-based film which, even when produced at a heightened productivity, can have satisfactory shrink finishing and printability. A void-containing heat-shrinkable polyester-based film that has a multilayer structure comprising a foamed layer and non-foamed layers disposed as outside layers respectively on both sides of the foamed layer, wherein thetwo outside films are equal in thickness, density, and the number of moles of an amorphous component. Due to this, the polyester-based film has specific heat shrinkability and a specific gloss.

Description

technical field [0001] The present invention relates to a void-containing heat-shrinkable polyester film, and particularly relates to a heat-shrinkable polyester film suitable for label applications. More specifically, it relates to a heat-shrinkable polyester film with voids which is used for labels of PET bottles and which does not curl when the labels are shrunk on the PET bottles, and which has a beautiful appearance. Background technique [0002] As a heat-shrinkable film, especially a heat-shrinkable film for a label of a bottle main body, a film made of polyvinyl chloride, polystyrene, or the like is mainly used. However, polyvinyl chloride has problems such as generation of chlorine-based gas when incinerated when discarded in recent years, and polystyrene has problems such as difficulty in printing. Polyester-based heat-shrinkable films with few of these problems have attracted attention. However, the specific gravity of a polyester film is about 1.4. Furthermore,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C61/06B29C55/06B32B27/36B65D23/08C08J9/00B29K67/00B29K105/04B29L7/00B29L9/00
CPCB32B27/36B29C55/06B29C61/06B65D23/08C08J9/00B29C63/42B65D65/40B32B27/065B32B5/18B32B2266/0264B32B7/028Y10T428/24992Y10T428/249953Y10T428/249987Y10T428/249989B29C48/88B29C48/022B29C48/914B29C48/21B29C48/0018B29K2067/00B29K2509/02B29K2995/0049B29L2031/744B32B7/02B32B27/08B32B27/20B32B2264/102B32B2307/736B32B2519/00B65C3/065B65D23/0878
Inventor 春田雅幸多保田规
Owner TOYOBO CO LTD
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