Heat-shrinkable polyester film and heat-shrinkable polyester label

A polyester, heat shrinkable technology, applied in the field of polyester films, can solve the problems of difficult paper label attachment, label curling, etc., and achieve the effects of good printing appearance, prevention of waste water generation, and high hiding ability.

Active Publication Date: 2015-08-26
KOLON IND INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case of a polyester-based shrink film label having a printing layer, the label itself suffers from severe curling, making it difficult to easily carry out the conventional paper label attaching process

Method used

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  • Heat-shrinkable polyester film and heat-shrinkable polyester label
  • Heat-shrinkable polyester film and heat-shrinkable polyester label
  • Heat-shrinkable polyester film and heat-shrinkable polyester label

Examples

Experimental program
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Effect test

preparation example Construction

[0085] In the method for preparing a heat-shrinkable polyester film according to the present invention, the step of preparing the masterbatch includes: mixing polybutylene terephthalate with particles to obtain a mixture; putting the mixture into a twin-screw extruder Or in a kneader for melting and kneading to obtain a polybutylene terephthalate masterbatch containing particles. When preparing polybutylene terephthalate masterbatches containing particles, a cooling device was added to the inside of the extruder screw to control the melting temperature. If the masterbatch of polybutylene terephthalate containing particles is prepared without using a cooling device to control the melting temperature, the chips may fuse at the feed section of the extruder, causing poor feeding, resulting in Kneadability with particles is reduced.

[0086] As such, the cooling process can be performed over all or part of the screw length using water or air.

[0087] The average particle size of...

Embodiment 1

[0149] (1) 100mol% of terephthalic acid as a dibasic acid component, 100mol% of ethylene glycol and 24mol% of neopentyl glycol as a dibasic alcohol component, and 0.05mol of Antimony trioxide (for the acid component) was polycondensed, whereby a copolyester (Co-PET) having an intrinsic viscosity of 0.67 dl / g and a melting point of 204° C. was produced.

[0150] (2) Polybutylene terephthalate is produced by polymerizing 100 mol% of terephthalic acid, 100 mol% of 1,4-butanediol, and 0.015 parts by weight of tetrabutyl titanate as a catalyst Ester (PBT) resin (intrinsic viscosity: 0.97 dl / g, melting point: 220°C).

[0151] (3) A mixture of PBT resin and titanium dioxide particles (particle size: 0.5 μm) was put into a twin-screw extruder or a kneader, and then melted and kneaded to prepare polyester masterbatch chips containing particles.

[0152]The screw of the extruder is equipped with a cooling device for water cooling, so that the melting temperature is controlled to not ex...

Embodiment 2

[0159] In addition to (4) 96wt% of (1) copolyester (Co-PET) and 4wt% of (2) PBT resin were mixed and dried to make chips, which were then put into the hopper at the top of the extruder, and A heat-shrinkable film was prepared in the same manner as in Example 1, except for (3) the masterbatch in an amount of 20 wt% based on the total weight of the polymer was fed using a side feeder. The properties of this film are shown in Table 3 below.

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Abstract

The present invention relates to a heat-shrinkable polyester-based film and to a heat-shrinkable polyester-based label. The heat-shrinkable polyester-based film of the present invention has superior shrinkability and color, and thus provides aesthetic enhancement to the product to which the film is attached when the film is printed. Therefore, the polyester-based film of the present invention can be valuably used as a label film as it can replace labels made of paper, and can be easily peeled off by means of hot water, and thus may contribute to the recycling of bottles. The heat-shrinkable polyester-based label includes a heat-shrinkable polyester-based film layer, and minimizes the rolling phenomenon thereof. Thus, a label sheet delivery process and an adhesive application process can be performed in a single process line, and therefore an existing paper label production line can be used as is. The bottle, to which the heat-shrinkable polyester-based label is attached, is provided with aesthetic enhancement and superior adhesive stain removability. In addition, the label of the present invention can be removed by means of hot water alone for recycling to thereby prevent the generation of wastewater, and is thus eco-friendly.

Description

technical field [0001] The present invention relates to a heat-shrinkable polyester film and a heat-shrinkable polyester label comprising the polyester film, in particular to a film used as a substitute for a paper label attached to a glass bottle Label. Background technique [0002] Considering environmental requirements and profitability, PET or glass bottles have been collected and reused. When reusing, it is necessary to separate and remove the label with the printed product name, ingredients and other graphics from the bottle except the bottle body of the PET bottle or glass bottle. In particular, paper labels, which have been mainly used so far, are removed using industrial water. Specifically, collected PET bottles or glass bottles were dipped in industrial water at about 80° C. containing sodium hydroxide to remove labels from the bottles. Consequently, the reuse of these bottles generates environmental wastewater, which is regulated by environmental regulations. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18G09F3/02C08G63/183C08K3/22C08L67/03
CPCG09F3/10Y10T428/2495Y10T428/31797C08J2367/02C08J3/226B29K2067/00B29K2105/16Y10T156/10B29C61/003Y10T428/13C08K3/0033Y10T428/25B29C63/42Y10T428/31786Y10T428/31565G09F3/0291C08K3/22G09F2003/0273C08J5/18C08J2467/02B29C55/08C08K3/013C08L67/02
Inventor 金允照金东珍金时敏
Owner KOLON IND INC
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