Low-shrinkage rate bidirectional stretching plastic thin film and preparation method thereof

A biaxially stretched plastic film technology, applied in the field of biaxially stretched plastic film, can solve the problems of reduced production efficiency, insufficient product width, poor economy, etc., and achieve the effect of reducing longitudinal shrinkage

Inactive Publication Date: 2014-01-22
NINGBO DXC NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two problems in this method: one is that the transverse width of the plastic film is affected to a certain extent during baking, which may cause insufficient width of the product and thus be scrapped; second, the use of secondary baking increases production costs and reduces production efficiency , less economical

Method used

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  • Low-shrinkage rate bidirectional stretching plastic thin film and preparation method thereof

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Embodiment Construction

[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] refer to figure 1 , a low shrinkage biaxially stretched plastic film, comprising a core layer 1, the material of the core layer 1 is polyethylene terephthalate (PET); also includes an upper surface layer 2 and a lower surface layer 3, the said The upper surface layer 2 covers the upper surface of the core layer 1, and the lower surface layer 3 covers the lower surface of the core layer 1;

[0022] The materials of the upper surface layer 2 and the lower surface layer 3 are:

[0023] Contains SiO 2 Amount of 3000ppm polyethylene terephthalate (PET): 60 parts by mass;

[0024] Polyethylene terephthalate (PET): 40 parts by mass.

[0025] The preparation method of the above-mentioned low shrinkage biaxially stretched plastic film comprises the following steps:

[0026] A. According to the ratio of SiO 2 The powder is mixed in...

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Abstract

The invention discloses a low-shrinkage rate bidirectional stretching plastic thin film which comprises a core layer and also comprises an upper surface layer and a lower surface layer, wherein the upper surface layer and the lower surface layer are made of the following materials in parts by weight: 60 parts of polyethylene glycol terephthalate with the SiO2 content of 3,000 ppm and 40 parts of polyethylene glycol terephthalate. The preparation method for the low-shrinkage rate bidirectional stretching plastic thin film comprises the following steps of A. coextruding an upper surface layer material, a core layer material and a lower surface layer material after material mixing is executed; B. longitudinally stretching; C. transversely stretching, and cutting off two longitudinal edges of the film before the film is completely cooled; D. performing corona treatment on the film from a widening machine in a dragger, and winding the film from the dragger in a winding machine. The two longitudinal edges of the film are cut off before the film is completely cooled, so that the film can be shrunk to a certain extent in the longitudinal direction, and the longitudinal shrinkage rate can be reduced; furthermore, the film can be shrunk to a certain extent in the transverse direction during the longitudinal shrinkage of the film, and therefore, according to the method, the transverse shrinkage rate of the film can be controlled at the same time.

Description

(1) Technical field [0001] The invention relates to a biaxially stretched plastic film and a preparation method of the film. (2) Background technology [0002] The share of plastic film products in the market is increasing, especially composite plastic flexible packaging, which has been widely used in food, medicine, chemical industry and other fields, among which food packaging accounts for the largest proportion, such as beverage packaging, quick-frozen food Packaging, cooking food packaging, fast food packaging, etc. These products have brought great convenience to people's lives. In addition, plastic films are also more and more widely used in various fields of industry, such as lithium battery separators, solar back Films for boards, films for liquid crystal displays, etc. [0003] However, currently the most widely used biaxial stretching technology is to use the following process: raw material mixing - drying - extrusion - casting - longitudinal stretching - horizont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B27/36B32B27/20B29C69/00
Inventor 罗培栋樊华伟
Owner NINGBO DXC NEW MATERIAL TECH
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