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Polyester thermal contraction film with balanced thermal contraction performance and production method thereof

A heat-shrinkable film, heat-shrinking technology, applied in chemical instruments and methods, layered products, synthetic resin layered products, etc. The effect of shrinkage equalization

Active Publication Date: 2009-09-16
ANHUI GUOFENG PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polystyrene (PS) heat-shrinkable film has low strength and is not impact-resistant, so it is rarely used, while PVC is not conducive to recycling and does not meet environmental protection requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Polyester film core layer component: polyethylene terephthalate 100%wt;

[0020] The top layer and the bottom layer contain masterbatch by weight percentage: 15%wt; the rest is copolymerized modified polyester PETG.

[0021] The masterbatch is a mixture of copolymerized modified polyester and synthetic silica, wherein the synthetic silica is 15% by weight; the rest is copolymerized modified polyester PETG.

[0022] The manufacture method of polyester film is carried out as follows:

[0023] a. Polyethylene terephthalate slices are dried in a fluidized bed at a temperature of 120-160°C for 4-5 hours to obtain dry raw materials; the dry raw materials are heated in the main extruder into a molten state, and obtained by filtration As the main extruded melt of the core layer; the masterbatch in the auxiliary extruder is also dried at a temperature of 150°C for 4 to 5 hours to obtain dry raw materials. After the copolymerized modified polyester chips and masterbatch are melt...

Embodiment 2

[0026] Polyester film core layer component: polyethylene terephthalate 100%wt;

[0027] The top layer and the bottom layer contain masterbatch by weight percentage: 25%wt; the rest is copolymerized modified polyester PETG.

[0028] The masterbatch is a mixture of copolymerized modified polyester and synthetic silica, wherein the synthetic silica is 25% by weight; the rest is copolymerized modified polyester PETG.

[0029] The production method of this example is the same as that of Example 1.

Embodiment 3

[0031] Polyester film core layer component: polyethylene terephthalate 100%wt;

[0032] The top layer and the bottom layer contain masterbatch by weight percentage: 20%wt; the rest is copolymerized modified polyester PETG.

[0033] The masterbatch is a mixture of copolymerized modified polyester and synthetic silica, wherein the synthetic silica is 20% by weight; the rest is copolymerized modified polyester PETG.

[0034] The production method of this example is the same as that of Example 1.

[0035] The longitudinal and transverse thermal shrinkage of the films in the above three cases are determined to be balanced. When the temperature is 90-100°C, the longitudinal thermal shrinkage rate is about 65%, and the transverse thermal shrinkage rate is about 70%. The longitudinal and transverse tensile strengths are 240-260Mpa. The production process of the invention is mature, has strong operability, and well adapts to the needs of industrialized production. The film can be dir...

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Abstract

The invention discloses a polyester thermal contraction film with balanced thermal contraction performance and production method thereof, the film is of three-layer construction: a top layer, a core layer and a bottom layer, wherein the component of the core layer is polyethylene terephthalate; the top layer and the bottom layer comprise parent material 15-25% wt and copolymerized modified polyester. The vertical, horizontal thermal contractions of the film are balanced and the vertical thermal contraction is about 65% and the horizontal thermal contraction is about 70% at 90-100DEG C; the vertical, horizontal tensile strengths are 240-260MPa. The process is mature with very strong operability, especially suitable for two-step tensile polyester film production line.

Description

technical field [0001] The invention relates to a heat-shrinkable film and a manufacturing method thereof, more specifically to a polyester heat-shrinkable film with balanced heat-shrinking properties and a manufacturing method thereof Background technique [0002] The heat-shrinkable plastic film is required to be stable at room temperature and shrink when heated (above the glass transition temperature and below the melting temperature). Heat-shrinkable labels are the main application fields of heat-shrinkable plastic films. [0003] In addition to being used as shrink labels, heat-shrinkable plastic films have begun to be applied to the outer packaging of daily commodities this year, especially the packaging of items with different appearances, because it can not only protect the packaged items, but also make the items win with a beautifully printed appearance. user. On the other hand, heat-shrinkable plastic films have been used in pallet packaging in recent years, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/08B32B27/20B29B13/06B29C69/02B29C47/06B29C47/92B29C55/14B29C48/08B29C48/92
CPCB29C48/92B29C2948/92704B29C48/08B29C2948/92895
Inventor 陈铸红汪中祥孙善卫
Owner ANHUI GUOFENG PLASTIC
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