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Heat-shrinkable multi-layered film

A shrinkable, multi-layer film technology, applied to layered products, synthetic resin layered products, identification devices, etc., can solve the problems of peeling off shrinkable labels, poor low-temperature shrinkage, and poor tearability

Active Publication Date: 2021-01-01
GUNZE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyester-based films have poor low-temperature shrinkage properties and rapidly shrink, causing wrinkles to easily occur when assembled in containers.
In addition, in order to recycle the container, the shrink film is mostly provided with row perforations for peeling off, so that the shrink label can be easily peeled off from the used container. Issues such as labels peeling off the container

Method used

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  • Heat-shrinkable multi-layered film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0215] As the resin constituting the front and back layers, 100% by weight of polyester-based resin A was used.

[0216] As the resin constituting the adhesive layer, a mixed resin containing 30% by weight of the elastomer A and 70% by weight of the polystyrene-based resin C was used.

[0217] As the resin constituting the intermediate layer, a mixed resin containing 15% by weight of polyester-based resin A, 25% by weight of polystyrene-based resin A, and 60% by weight of polystyrene-based resin B was used.

[0218] These resins were put into an extruder with a barrel temperature of 160-250°C, extruded into a sheet with a 5-layer structure by a multi-layer die at 250°C, and cooled and solidified by a pulling roll at 30°C. Next, after stretching at a draw ratio of 6 times in a tenter stretching machine with a preheating zone of 105°C, a stretching zone of 90°C, and a heat setting zone of 85°C, it was coiled by a coiler to obtain a A heat-shrinkable multilayer film in which the...

Embodiment 2

[0221] As the resin constituting the front and back layers, 100% by weight of polyester-based resin A was used.

[0222] As the resin constituting the adhesive layer, a mixed resin containing 65% by weight of the elastomer A and 35% by weight of the polystyrene-based resin C was used.

[0223] As the resin constituting the intermediate layer, a mixed resin containing 15% by weight of polyester-based resin A, 25% by weight of polystyrene-based resin A, and 60% by weight of polystyrene-based resin B was used.

[0224] These resins were put into an extruder with a barrel temperature of 160-250°C, extruded into a sheet with a 5-layer structure by a multi-layer die at 250°C, and cooled and solidified by a pulling roll at 30°C. Next, after stretching at a draw ratio of 6 times in a tenter stretching machine with a preheating zone of 105°C, a stretching zone of 90°C, and a heat setting zone of 85°C, it was coiled by a coiler to obtain a A heat-shrinkable multilayer film in which the...

Embodiment 3

[0227] As the resin constituting the intermediate layer, a mixed resin containing 5% by weight of polyester-based resin A, 28% by weight of polystyrene-based resin A, and 67% by weight of polystyrene-based resin B was used, except that it was the same as in Example 1. operation to obtain a heat-shrinkable multilayer film.

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Abstract

The purpose of the present invention is to provide a heat-shrinkable multi-layered film that can be used for producing a heat-shrinkable label exhibiting superb impact resistance and transparency andhaving excellent characteristics that enable cutting along perforation both in the TD direction and the MD direction. The present invention pertains to a heat-shrinkable multi-layered film in which anobverse surface layer, a reverse surface layer, and an intermediate layer are laminated via adhesive layers, wherein the obverse and reverse layers contain a polyester resin, and the intermediate layer contains 80-99 wt% of a polystyrene resin and 1-20 wt% of a polyester resin.

Description

technical field [0001] The present invention relates to a heat-shrinkable multilayer film capable of producing a heat-shrinkable label having excellent row perforation tearability in both the TD direction and the MD direction, as well as excellent impact resistance and transparency. Background technique [0002] In recent years, many containers such as plastic bottles and metal cans have been attached with shrink labels obtained by printing or the like on a base film made of a heat-shrinkable resin film. [0003] As shrink labels, labels made of polystyrene-based resins are mainstream due to their excellent low-temperature shrinkability. However, since polystyrene-based resin films have insufficient heat resistance, for example, when heated in a heater in a convenience store or the like, there is a problem that shrinkage occurs when the PET bottle is dumped, and the label is deformed or damaged. In addition, polystyrene-based resin films have insufficient solvent resistance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B7/028B32B7/12B32B27/30B32B27/36G09F3/04
CPCB32B27/08B32B7/12B32B27/302B32B27/36B32B2250/05B32B2250/24B32B2250/40B32B2270/00B32B2274/00B32B2307/30B32B2307/412B32B2307/536B32B2307/514B32B2307/581B32B2307/736B32B2307/732B32B2519/00B32B2439/00B32B2307/748B32B7/028B32B27/32C09J125/06C09J167/00G09F3/02
Inventor 大西祐辅
Owner GUNZE LTD
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