Heat-shrinkable polyester-based film

A technology of heat shrinkage and polyester, applied to flexible coverings, identification devices, instruments, etc., can solve the problems of uneven thickness, low heat resistance, loss of film heat shrinkability, etc., and achieve small thickness unevenness , High heat shrinkage effect

Pending Publication Date: 2020-11-10
TOYOBO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among such heat-shrinkable films, polyvinyl chloride-based films have problems such as low heat resistance, generation of hydrogen chloride gas when incinerated, and a cause of dioxins.
In addition, polystyrene-based films have poor solvent resistance and must use special inks for printing. They also have the following problems: they need to be incinerated at high temperatures, and a large amount of black smoke is produced with a foul smell during incineration.
In this way, in heat-shrinkable films, by increasing the compounding ratio of recycled PET that exhibits crystallinity, the heat-shrinkability of the film will be lost, that is, the reduction of environmental burden (increase in the use ratio of recycled PET) and the heat-shrinkability of the film will be eclectic relationship
In addition, as mentioned above, the heat-shrinkable polyester film using an amorphous raw material has the problems of low heat resistance and poor thickness unevenness.

Method used

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  • Heat-shrinkable polyester-based film
  • Heat-shrinkable polyester-based film
  • Heat-shrinkable polyester-based film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0149] Mix polyester B and polyester C at a mass ratio of 95:5 and put them into the extruder. The mixed resin was melted at 280° C., extruded from a T die, wound on a rotating metal roll whose surface temperature was cooled to 30° C., and quenched to obtain an unstretched film with a thickness of about 150 μm. The Tg of the unstretched film was 75°C.

[0150] The obtained unstretched film was introduced into a transverse stretching machine (tenter), and preheated at 130° C. for 5 seconds. The preheated film was continuously introduced into the first half of the lateral stretching region, and laterally stretched at 90° C. to 2.0 times. Next, in the second half region of the lateral stretching, it was laterally stretched at 82° C. to 1.9 times. The final transverse stretch ratio was 3.8 times. Finally, after heat treatment at 50° C. for 3 seconds in the heat treatment zone, cool, cut and remove both edges, and wind it into a roll with a width of 500 mm to continuously produc...

Embodiment 2～4

[0152] In said Example 1, the film of Examples 2-4 was manufactured similarly to Example 1 except having changed the conditions of transverse stretching and polyester raw material as shown in Table 2.

Embodiment 5

[0168] Mix polyester G and polyester C at a mass ratio of 95:5 and put them into the extruder. The mixed resin was melted at 280° C., extruded from a T die, wound on a rotating metal roll whose surface temperature was cooled to 30° C., and quenched to obtain an unstretched film with a thickness of about 150 μm. The Tg of the unstretched film was 74°C.

[0169] The obtained unstretched film was introduced into a transverse stretching machine (tenter), and preheated at 140° C. for 5 seconds. The preheated film was continuously introduced into the first half of the lateral stretching region, and laterally stretched at 95° C. to 2.0 times. Next, in the second half region of the lateral stretching, it was laterally stretched at 82° C. to 1.9 times. The final transverse stretch ratio was 3.8 times. Finally, heat treatment at 50° C. for 3 seconds in the heat treatment zone, cooling, cutting and removing both edges, and winding into a roll with a width of 500 mm, thereby continuous...

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Abstract

[Problem] To provide: a heat-shrinkable polyester-based film which is substantially free of amorphous components, uses biomass resource-derived raw materials and / or recycled PET, preferably at a highratio of recycled PET, has high heat-shrinkage in the width direction, and has small thickness variation; and a method for producing the heat-shrinkable polyester-based film. [Solution] The present invention provides a heat-shrinkable polyester-based film containing at least 90 mol% of an ethylene terephthalate unit in 100 mol% of all ester units, wherein at least a portion of ethylene glycol and / or terephthalic acid constituting the ethylene terephthalate is derived from biomass resources, or contains a polyester resin recycled from PET bottles, and requirements (1) to (4) below are satisfied. (1) Heat-shrinkage in the width direction when shrunk in hot water at 90 DEG C for 10 seconds is 50% to 75%. (2) Heat-shrinkage in the longitudinal direction when shrunk in hot water at 90 DEG C for10 seconds is -6% to 14%. (3) Heat-shrinkage in the longitudinal direction when shrunk in hot water at 70 DEG C for 10 seconds is -6% to 6%. (4) Thickness variation in the width direction is 1% to 20%.

Description

technical field [0001] The present invention relates to a heat-shrinkable polyester film suitable for use in heat-shrinkable labels. Background technique [0002] In recent years, in addition to label packaging, lid sealing, integrated packaging, etc., which take into account the protection of glass bottles or plastic bottles and the display of products, polyvinyl chloride-based resins, Stretched films (so-called heat-shrinkable films) made of polystyrene-based resins and polyester-based resins. Among such heat-shrinkable films, polyvinyl chloride-based films have problems such as low heat resistance, generation of hydrogen chloride gas during incineration, and a cause of dioxin. In addition, polystyrene-based films have poor solvent resistance and require the use of special inks for printing. They also have the following problems: they need to be incinerated at high temperatures, and a large amount of black smoke is produced with a foul smell during incineration. On the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18B29C55/08B29C61/02B65D65/02B65D77/20C08L67/02G09F3/04B29K67/00B29K105/02B29L7/00
CPCB29C55/08B29C61/02C08J5/18G09F3/0291C08J2367/02C08G63/183C08G63/199C08G63/672C08L67/02C08L2207/20C08L2205/025C08J2467/02
Inventor 石丸慎太郎春田雅幸
Owner TOYOBO CO LTD
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