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.
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[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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