Heat-shrinkable multi-layered film

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...

Examples

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.

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...

Examples

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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