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Heat shrinkable polyester film and package

A technology of heat shrinkage and film, applied in the direction of transportation and packaging, packaging, wrapping paper, etc., can solve the problems of high shrinkage stress, poor solvent resistance, low heat resistance, etc., and achieve the effect of low shrinkage stress

Active Publication Date: 2018-04-17
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among such heat-shrinkable films, polyvinyl chloride-based films have problems such as low heat resistance, generation of hydrogen chloride gas during incineration, or the cause of dioxins, etc.
In addition, polystyrene-based films have the following problems: poor solvent resistance, ink with a special composition must be used for printing, and it must be incinerated at high temperature, and a large amount of black smoke is generated with a foul smell during incineration
[0006] However, for a raw material that does not contain a large amount of amorphous components, the tensile stress at the time of stretching becomes high, so the stress at the time of shrinkage, that is, the shrinkage stress becomes high
As a problem caused by high shrinkage stress, for example, in bottle labels, a film is wound around a bottle, and the ends of the labels are attached to each other with an adhesive or the like, and then heated to perform shrinkage processing. However, if the shrinkage stress is high, sticking occurs. Attached parts will be misplaced or peeled off the trouble
In addition, in recent years, in order to reduce weight and reduce waste, containers of bento and side dishes sold in convenience stores and supermarkets sometimes use thin containers, and the strength of the containers also decreases for thin containers. If the shrinkage stress of the shrink film is high, the container may be deformed due to the shrinkage stress.

Method used

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  • Heat shrinkable polyester film and package
  • Heat shrinkable polyester film and package
  • Heat shrinkable polyester film and package

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0075] Hereinafter, the present invention will be described in more detail based on examples, but the present invention is not limited to the forms of these examples at all, and can be appropriately changed within a range not departing from the gist of the present invention. The compositions of the raw materials used in Examples and Comparative Examples, the production conditions of the films in Examples and Comparative Examples, and the evaluation results of the films in Examples and Comparative Examples are shown in Table 1, Table 2, and Table 3, respectively.

[0076] [Table 1]

[0077]

[0078] [Table 2]

[0079]

[0080] [table 3]

[0081]

[0082] In addition, the evaluation method of the film is as follows.

[0083] [Tg (glass transition point)]

[0084] Using a differential scanning calorimetry analyzer (manufactured by Seiko Denshi Kogyo Co., Ltd., DSC220), 5 mg of an unstretched film was placed in a sample pan, the lid of the pan was closed, and the tempe...

Synthetic example B~D

[0110] Polyesters B to D shown in Table 1 were obtained by the same method as in Synthesis Example 1. When manufacturing polyesters B and D, SiO is added as a lubricant at a ratio of 7200ppm relative to the polyester 2 (Sylysia 266 manufactured by Fuji Sylysia Co., Ltd.; average particle diameter: 1.5 μm). It should be noted that DEG in the table is diethylene glycol. The intrinsic viscosities of the respective polyesters were B: 0.7 dl / g, C: 0.65 dl / g, and D: 0.65 dl / g. In addition, each polyester is suitably formed into a chip shape.

[0111] In addition, polyester E is a recycled raw material ("Clearpellet" manufactured by Petbottle Recycling Co., Ltd.), and its intrinsic viscosity is 0.63 dl / g. In addition, as described in Table 1, this polyester E contains isophthalic acid (2 mol%) with respect to all the dicarboxylic acid components constituting the polyester.

[0112] For polyester F, a resin was prepared by the following production method. To a mixture of terephth...

Embodiment 1

[0114] The above-mentioned polyester A, polyester C and polyester D were mixed at a weight ratio of 87:7:6, and charged into an extruder. Thereafter, the 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 162 μm. The Tg of the unstretched film was 72°C. Thereafter, this unstretched film was introduced into a transverse stretching machine (hereinafter referred to as a tenter). Then, the unstretched film introduced into the tenter was preheated until the film temperature reached 100°C (Tg+28°C), and then stretched 4.5 times in the transverse direction at 90°C (Tg+18°C). Furthermore, the film stretched horizontally in this way is introduced into a vertical stretching machine in which a plurality of roll groups are continuously arranged, preheated on the preheating roll until it reaches 90°C (Tg+18°C), and stretched using the speed d...

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Abstract

Provided is a heat shrinkable polyester film that has sufficient thermal shrinkage characteristics in the main shrinkage direction, which is the longitudinal direction, without containing a large amount of a monomer component that may serve as an amorphous component, while having low thermal shrinkage in the width direction, which is perpendicular to the main shrinkage direction, and low shrinkagestress. The heat shrinkable polyester film is characterized by containing ethylene terephthalate as a main constituent, while containing from 0 mol% to 5 mol% (inclusive) of a monomer component thatmay serve as an amorphous component in all polyester resin components, and is characterized by satisfying the following conditions (1)-(4). (1) The hot water thermal shrinkage in the main shrinkage direction of film is from 15% to 50% (inclusive) in cases where the film is treated in a hot water at 90 DEG C for 10 seconds. (2) The hot water thermal shrinkage in the width direction, which is perpendicular to the main shrinkage direction of film, is from 0% to 12% (inclusive) in cases where the film is treated in a hot water at 90 DEG C for 10 seconds. (3) The maximum shrinkage stress in the main shrinkage direction of film as measured in a hot air at 90 DEG C is from 2 MPa to 10 MPa (inclusive). (4) A constituent unit derived from diethylene glycol is contained in an amount of from 7 mol% to 30 mol% (inclusive) in 100 mol% of all polyester resin components.

Description

technical field [0001] The present invention relates to a heat-shrinkable polyester-based film and a package. Specifically, it relates to a film suitable for use as a label, a banding application for binding bento containers, etc., which does not contain a large amount of non-polyester as a monomer component constituting polyester. Film with crystalline components, high shrinkage rate in the main shrinkage direction, low shrinkage rate in the direction perpendicular to the main shrinkage direction, and low shrinkage stress, so peeling of the adhesive part of the label and deformation of the container are less likely to occur Heat-shrinkable polyester film. Background technique [0002] In recent years, in applications such as label packaging, cap seals, integrated packaging, etc., which take into account the protection of glass bottles, PET bottles, etc. and the display of products, they are made of polyvinyl chloride resin, polystyrene resin, polyester resin, etc. High-qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B29C61/06B65D65/02B65D75/02B29K67/00B29K105/02B29L7/00
CPCB29C61/06C08J5/18C08J2367/02C08J2467/02B29C61/02B29C61/006B65D65/02B65D75/02C08L67/02B29C61/0666B65D65/14
Inventor 井上雅文春田雅幸
Owner TOYOBO CO LTD
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