Polyester composite film applied to extrusion coating type packaging bags and preparation method of polyester composite film

A polyester composite film and packaging bag technology, applied in chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problem of broken bags, low composite fastness of PET layer and PE layer, and inability to meet the requirements of retort bags. Demand and other issues, to achieve high composite fastness, avoid solvent-based adhesives, and use less raw materials
CN104290422AInactive Publication Date: 2015-01-21ANHUI GUOFENG PLASTIC
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ANHUI GUOFENG PLASTIC
Publication Date
2015-01-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a polyester composite film applied to extrusion coating type packaging bags. The polyester composite film comprises a base material layer, a cross-linking agent layer and a hot melt glue layer, wherein the base material layer is integrally laminated with the hot melt glue layer by virtue of the cross-linking agent layer; the base material layer is made of a biaxially oriented polyester film; the cross-linking agent layer is made of an aqueous prime coating and curing cross-linking agent; the hot melt glue layer is made of high-density polyethylene; the aqueous prime coating and curing cross-linking agent is an aqueous solution with the pH value being 8-11; the effective component of the aqueous prime coating and curing cross-linking agent is polyethyleneimine with the molecular weight being 7500-10000; the content of polyethyleneimine in the mass of the aqueous prime coating and curing cross-linking agent is 1-5%. Hot melt layers formed by the biaxially oriented polyester film and the high-density polyethylene are laminated as a whole body by virtue of the cross-linking agent layer, so that the compounding fastness of the hot melt layers cannot be stripped and can be greater than or equal to 4.0N per 15mm; the polyester composite film is low in raw material consumption and low in production cost.
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Description

[0001] technical field

[0002] The invention relates to the technical field of films, in particular to an extrusion coating type polyester composite film for packaging bags and a preparation method thereof.

[0003] Background technique

[0004] Plastic composite film for food packaging is a film that combines several films with different functional properties through a primer. It is used for food packaging and has the functions of beauty, tear resistance, oxygen resistance, and water resistance. Due to the different types of films, the effects of composite films are also different. Among them, biaxially oriented polyester film (BOPET for short) has the characteristics of high strength, good rigidity, transparency, and high gloss; it is odorless, tasteless, colorless, and non-toxic. , outstanding toughness; in addition, the key point is that its tensile strength is 3 times that of PC film and nylon film, and its impact strength is 3-5 times that of BOPET film. It has excel...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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