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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

Inactive Publication Date: 2015-01-21
ANHUI GUOFENG PLASTIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the biggest disadvantage of this type of composite film is that the composite fastness of the PET layer and the PE layer is low, which is easy to cause bag breakage, and cannot meet the needs of retort bags.

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Such as figure 1 As shown, a polyester composite film for extrusion coating packaging bags is composed of a substrate layer 1, a crosslinking agent layer 2 and a hot melt layer 3, wherein the material of the substrate layer 1 is biaxially stretched polyester In the film, the material of the cross-linking agent layer 2 is a water-based primer curing cross-linking agent, and the material of the hot-melt layer 3 is high-density polyethylene. The cross-linking agent layer 2 is coated on the corona-treated surface of the biaxially stretched polyester film, and after drying, the melt-extruded high-density polyethylene is coated on the cross-linking agent layer 2 to form a hot-melt layer 3, that is, cross-linking agent layer 2 The linking agent layer 2 is located between the substrate layer 1 and the hot-melt layer 3, and the crosslinking agent layer 2 is in contact with the surface of a biaxially stretched polyester film with a surface wetting tension of 56-62 dyn and a rough...

Embodiment 2

[0038] 1) Biaxially stretched polyester film with high surface wetting tension is selected as the substrate layer, and the surface is corona treated;

[0039] 2) Coat the corona-treated surface of the biaxially oriented polyester film with a water-based primer curing cross-linking agent solution, and then enter it into an oven at 60°C for 0.5 seconds;

[0040] 3) High-density polyethylene is melted at a high temperature of 330°C and extrusion coated on the surface of a biaxially oriented polyester film coated with a water-based primer curing crosslinking agent;

[0041] 4) After laminating, the cold roll and the back pressure roll are cooled and pressed together, then trimmed, pulled and rolled up to obtain a finished polyester composite film with a three-layer structure. The temperature of the cold roll is 12°C.

[0042]

Embodiment 3

[0044] 1) Biaxially stretched polyester film with high surface wetting tension is selected as the substrate layer, and the surface is corona treated;

[0045] 2) Coat the corona-treated surface of the biaxially oriented polyester film with a water-based primer curing cross-linking agent solution, and then enter it into an oven at 80°C for 1 second;

[0046] 3) High-density polyethylene is melted at a high temperature of 310°C and extrusion coated on the surface of a biaxially oriented polyester film coated with a water-based primer curing crosslinking agent;

[0047] 4) After laminating, the cold roll and the back pressure roll are cooled and pressed together, then trimmed, pulled and rolled up to obtain a finished polyester composite film with a three-layer structure. The temperature of the cold roll is 9°C.

[0048]

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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.

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

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Application Information

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IPC IPC(8): B32B27/08B32B27/36B32B27/30B32B27/32
CPCB32B27/08B32B27/30B32B27/32B32B27/36
Inventor 陈铸红张娜娜汪中祥惠振京
Owner ANHUI GUOFENG PLASTIC
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