Composite heavy packaging film

Abstract

The invention discloses a composite heavy packaging film, comprising, from exterior to interior, a kraft paper layer, a PET polyester layer, an AL layer and a three-layer co-extruded polyethylene layer. Compared with the prior art, the invention has the following advantages: through usage of a composite structure, AL of a barrier layer can be effectively protected and is prevented from easy fracture; through mutual cooperation of a plurality of substrates, the composite heavy packaging film has good environmental suitability and barrier properties and adapts to packaging of a variety of large-volume contents.

Description

technical field [0001] The invention belongs to a composite heavy packaging film, in particular to a paper-aluminum-plastic composite packaging film. Background technique [0002] At present, the packaging film that can carry 10kg-50kg solid particles or powdery materials is generally called heavy packaging film. Heavy-duty packaging film is mainly used for packaging plastic raw materials, fertilizers, feed, rice, soybeans and grains, etc. It includes PP woven bags, paper bags, and co-extruded PE heavy-duty packaging bags. Although the traditional packaging forms with the above types of packaging as the main body still occupy a dominant position in the domestic market, the traditional heavy packaging forms directly limit their further development in the field of heavy packaging due to the defects of the packaging materials themselves. [0003] (1) Traditional paper-plastic composite bags are easy to break, resulting in a large amount of product loss and poor appearance; ...

AI Technical Summary

Problems solved by technology

Although the above-mentioned traditional packaging forms as the main body still occupy a dominant position in the domestic market, the traditional heavy packaging forms directly limit their further development in the field of heavy packaging due to the defects of the packaging materials themselves.

[0003] (1) Traditional paper-plastic composite bags are easy to break, resulting in a large amount of product loss and poor appearance;

[0004] (2) Traditional paper-plastic composite bags have higher requirements for temperature and humidity in storage, logistics and transportation environments;

[0005] (3) The printing on the surface of plastic woven bags requires the use of benzene-containing ink, which does not meet the requirements of the Food Safety Law, thus restricting its use in the field of food packaging;

[0006] (4) The traditional heavy packaging speed is low, and it is difficult to adapt to the high-speed packaging requirements of the packaging line;

[0007] (5) The traditional FFS packaging (FFS bag is an abbreviation for the integration of bag making (Film)-filling (Fil1)-sealing (Sea1)), although it can realize continuous automatic molding at one time, it is difficult for the packaging content, heat sealing There are some disadvantages in strength, palletizing, transportation and other links

[0008] (6) Traditional packaging bags of this type do not meet the requirements in terms of barrier properties, and cannot pack some products that require high barrier properties

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