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Liquid package composite membrane and preparation method thereof

A composite film and liquid technology, applied in packaging, wrapping paper, transportation and packaging, etc., can solve the problems of poor drop resistance and pressure resistance, low heat sealing strength of composite films, etc., and achieve excellent drop resistance and pressure resistance, high toughness , the effect of good compatibility

Active Publication Date: 2014-11-05
ZHEJIANG GOLDSTONE PACKING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: the heat-sealing strength of the composite film used to make the liquid packaging bag is low, and the drop and pressure resistance performance is relatively poor, so as to provide a liquid packaging composite film with good drop and pressure resistance performance and its preparation method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A liquid packaging composite film, comprising a surface layer, a barrier layer, a reinforcing layer and a heat-sealing layer, the surface layer is a corona-treated polyethylene terephthalate film layer, the barrier layer is an aluminum foil layer, and the The reinforcing layer is a corona-treated polyethylene terephthalate film layer, and the heat-sealing layer is composed of the following materials by weight, 40wt% of eight carbon linear low density polyethylene, 50wt% of polyacetic acid Ethylene, 10 wt% low density polyethylene.

[0022] The heat-sealing layer in this embodiment is prepared by blow molding at 150° C. after uniformly mixing the eight-carbon linear low-density polyethylene, the polyvinyl acetate, and the low-density polyethylene.

[0023] The preparation method of the liquid packaging composite film described in the present embodiment is as follows:

[0024] (1) Coating an adhesive on the surface of the barrier layer, drying it at 30°C, and curing the ...

Embodiment 2

[0027] A liquid packaging composite film, comprising a surface layer, a barrier layer, a reinforcing layer and a heat-sealing layer, the surface layer is a corona-treated polyethylene terephthalate film layer, and the barrier layer is an aluminum foil layer, The reinforcing layer is a corona-treated polyethylene terephthalate film layer, and the heat-sealing layer is composed of the following materials in parts by weight, 50wt% of eight carbon linear low density polyethylene, 42wt% of Polyvinyl acetate, 8wt% low density polyethylene.

[0028] In this embodiment, the heat-sealing layer is prepared by blow molding at 155° C. after mixing the eight-carbon linear low-density polyethylene, the polyvinyl acetate, and the low-density polyethylene uniformly.

[0029] The preparation method of the liquid packaging composite film described in the present embodiment is as follows:

[0030] (1) Coating an adhesive on the surface of the barrier layer, drying it at 40°C, and curing the adh...

Embodiment 3

[0033] A liquid packaging composite film, comprising a surface layer, a barrier layer, a reinforcing layer and a heat-sealing layer, the surface layer is a corona-treated polyethylene terephthalate film layer, and the barrier layer is an aluminum foil layer, The reinforcing layer is a corona-treated polyethylene terephthalate film layer, and the heat-sealing layer is composed of the following materials in parts by weight, 60wt% of eight-carbon linear low density polyethylene, 35wt% of Polyvinyl acetate, 5wt% low density polyethylene.

[0034] The heat-sealing layer in this embodiment is prepared by blow molding at 160° C. after uniformly mixing the eight-carbon linear low-density polyethylene, the polyvinyl acetate, and the low-density polyethylene.

[0035] The preparation method of the liquid packaging composite film described in this embodiment is as follows:

[0036](1) Apply an adhesive on the surface of the barrier layer, and dry it at 50°C to cure the adhesive on the b...

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Abstract

The invention provides a liquid package composite membrane and a preparation method thereof and belongs to the technical field of plastic package. The composite membrane comprises a surface layer, an obstruction layer, a reinforced layer and a heat seal layer, wherein the surface layer is a polyethylene terephthalate film layer; the obstruction layer is an aluminum foil layer; the reinforced layer is a polyethylene terephthalate film layer; and the heat seal layer consists of the following materials: 40-60wt% of eight-carbon linear low-density polyethylene, 35-50wt% of polyvinyl acetate and 5-10wt% of low-density polyethylene. The liquid package composite membrane provided by the invention has excellent break-resistant and pressure-resistant performances; break-resistant performance test shows that the liquid package composite membrane does not break while falling to a cement floor from a height of 10 meters once; and pressure-resistant performance test shows that the liquid package composite membrane has no leakage within 24 hours when the static pressure is 20MPa.

Description

technical field [0001] The invention relates to a liquid packaging composite film and a preparation method thereof, in particular to a composite film for making drop-resistant and pressure-resistant liquid packaging bags and a preparation method of the composite film, belonging to the technical field of plastic packaging. Background technique [0002] In the prior art, the structure of the composite film used for packaging bags usually includes a protective layer, a barrier layer and a heat-sealing layer, wherein the protective layer protects the printed pattern; the barrier layer is a functional layer with functions such as gas barrier and light shielding. Function; the heat-sealing layer plays the role of heat-sealing, and polyethylene film or polypropylene film is usually used as heat-sealing material. The packaging bag made of the composite film in the prior art has poor pressure resistance, and it is easy to break the packaging bag if it is lightly dropped, and the cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B65D65/40B32B15/085B32B15/20B32B37/12
Inventor 张文锋曾文明孙国锦杨虎平
Owner ZHEJIANG GOLDSTONE PACKING
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