Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Heat-shrinkable polyester film and package

a polyester film and heat shrinkage technology, applied in the direction of synthetic resin layered products, other domestic articles, sustainable manufacturing/processing, etc., can solve the problems of high temperature incineration, low heat resistance, and large black smoke accompanied by abnormal odor, and achieve small shrinkage stress, high followability, and sufficient heat shrinkage properties

Pending Publication Date: 2018-06-14
TOYO TOYOBO CO LTD
View PDF6 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a heat-shrinkable polyester film that has low shrinkage stress and high followability to containers, which reduces slack and improves finishing. The film has a specific composition that allows it to have low shrinkage stress and small attenuation of shrinkage stress in the main shrinkage direction, resulting in high followability to containers during shripping. The film is suitable for use as a label for bottles or a banding film to bind containers and can be efficiently mounted to the container. After heat shrinkage, the film reduces shrinkage shortage, lengthwise sink-marks, and container deformation while maintaining good finishing.

Problems solved by technology

Of these heat-shrinkable films, a polyvinyl chloride film has problems that heat resistance is low, and it generates hydrogen chloride gas in incineration and causes dioxin.
A polystyrene film has problems that it is inferior in solvent resistance, as well as an ink with a special composition needs to be used in printing, it requires high temperature incineration and generates a lot of black smoke accompanied by an abnormal odor.
Therefore, it is difficult to mount a label or a banding film made of the heat-shrinkable film that heat-shrinks in the width direction to a bottle or a box lunch container at high speed.
In the case of a label of a beverage bottle, if the label does not follow the shape of the bottle and has no tightness, there is a problem that when a consumer holds the body of the bottle and opens the cap of the bottle, the cap cannot be opened easily since the label rotates.
However, if the shrinkage stress is too high, there is a problem that when a thin soft beverage bottle or box lunch container is packaged with the film, the bottle or container may deform.
In addition, there is a problem that the bonded portion of a cylindrical label or a banding film may be separated due to high shrinkage stress.
However, in the method described in Patent Document 1, a large-scale facility for biaxially drawing is necessary, which causes a problem of increased cost.
Furthermore, it is difficult to mount a film that shrinks in the width direction as described above to a bottle or a box lunch container at high speed.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Heat-shrinkable polyester film and package
  • Heat-shrinkable polyester film and package

Examples

Experimental program
Comparison scheme
Effect test

synthetic example 1

[0089]100 mol % of dimethyl terephthalate (DMT) as a dicarboxylic acid component and 100 mol % of ethylene glycol (EG) as a polyhydric alcohol component were placed in a stainless steel autoclave equipped with a stirrer, a thermometer and a partially circulating cooler such that the amount of ethylene glycol was 2.2 times the amount of dimethyl terephthalate in terms of the molar ratio, 0.05 mol % (based on the acid component) of zinc acetate was added as an ester exchange catalyst, 0.225 mol % (based on the acid component) of antimony trioxide was added as a polycondensation catalyst, and an ester exchange reaction was carried out while distilling away generated methanol to outside the system. Thereafter, a polycondensation reaction was carried out at 280° C. under a reduced pressure of 26.7 Pa to obtain polyester 1 having an intrinsic viscosity of 0.75 dl / g. The composition is shown in Table 1.

synthetic examples 2 to 7

[0090]Polyesters 2 to 4 shown in Table 1 were prepared in the same manner as in Synthetic Example 1. In the production of polyester 2, SiO2 (Silysia 266, manufactured by FUJI SILYSIA CHEMICAL LTD.; average particle diameter: 1.5 μm) was added as a lubricant at a proportion of 7,200 ppm relative to the polyester. In the Table, NPG is neopentyl glycol, BD is 1,4-butanediol, and DEG is diethylene glycol, which is a side product. The intrinsic viscosities of polyesters 2, 3 and 4 were 2: 0.75 dl / g, 3: 1.20 dl / g and 4: 1.20 dl / g, respectively. Each polyester was appropriately formed into a chip.

example 1

[0091]Polyester 1, polyester 2 and polyester 3 as described above were mixed in the mass ratio of 45:5:50 and the mixed resin was introduced into an extruder. The mixed resin was molten at 280° C. and extruded from a T-die and then quenched by winding it around a rotating metal roll set at a surface temperature of 30° C. to obtain an undrawn film with a thickness of 42 μm. Tg of the undrawn film was 75° C. The obtained undrawn film was introduced to a lengthwise drawing machine in which a plurality of rolls were continuously disposed, heated till the film temperature reached 80° C. on a preheating roll, and then lengthwise drawn by a roll drawing method at the draw ratio in the longitudinal direction of 3.5 times so as to allow the thickness of the film after drawing to be 12 μm. After lengthwise drawing, the film was cooled by a cooling roll whose surface temperature was set to 25° C., and then wound as a roll. The resulting film was evaluated for various properties in the above-me...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
shrinkageaaaaaaaaaa
shrinkageaaaaaaaaaa
shrinkageaaaaaaaaaa
Login to View More

Abstract

The invention provides a heat-shrinkable polyester film which has sufficient heat shrinkage properties in a main shrinkage direction that is in the longitudinal direction, has low heat shrinkage in the width direction orthogonal to the main shrinkage direction, does not have excessively high shrinkage stress in the main shrinkage direction, and has small attenuation of the shrinkage stress, whereby the followability to a container which is an object to be packaged is high, and slack is less likely to be generated.

Description

TECHNICAL FIELD[0001]The present invention relates to a heat-shrinkable polyester film and a package. More particularly, the present invention relates to a heat-shrinkable polyester film which is suitable for a label application and a banding application to bind a box lunch container or the like and which enables finishing with less slack to an object to be packaged since the attenuation of shrinkage stress of the film at the time of shrinking by heating is small.BACKGROUND ART[0002]Recently, in applications such as label package doubling as a protection of a glass bottle and a PET bottle etc. and display of articles, cap sealing, and accumulation package, there have been widely used drawn films (so-called heat-shrinkable films) composed of a polyvinyl chloride resin, a polystyrene resin, a polyester resin or the like. Of these heat-shrinkable films, a polyvinyl chloride film has problems that heat resistance is low, and it generates hydrogen chloride gas in incineration and causes ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(United States)
IPC IPC(8): B65D75/00
CPCB65D75/002C08J5/18B32B27/36C08J2367/02B32B27/08B32B2307/746B32B2250/03B32B2250/02B32B2307/418B32B2264/0235B32B2307/732B32B2264/10B32B2439/66B32B2519/00B32B2439/62B32B2270/00B32B2439/60B32B2264/102B32B2264/025B32B7/022B32B2264/104B32B27/20B32B2307/30B32B27/28B32B2264/0214B32B7/04B32B3/02B32B27/10Y02W30/80B29C61/06B65D65/02C08L67/02
Inventor INOUE, MASAFUMIHARUTA, MASAYUKI
Owner TOYO TOYOBO CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com