New composite film

Abstract

The invention discloses a novel composite film. The composite film consists of an upper outer layer, a lower outer layer and a middle core layer, wherein the core layer and the outer layers are compounded into a whole by adhesive. The outer layer can be in a single layer structure, a double-layer structure or a multi-layer structure which consists of more than two layers of single film. The core layer can be in a single layer structure, a double-layer structure or a multi-layer structure which consists of more than two layers of single film. The core layer is made of polyethylene glycol terephthalate PET has the density of 1.395g / cm<3>-1.405g / cm<3> and the thickness of 10 micrometers to 50 micrometers. The outer layer is made of one of low-density polythene (LDPE), high-density polythene (HDPE) and casting polypropylene (CPP), and also can be made by mixing two or more than two of low-density polythene (LDPE), high-density polythene (HDPE), casting polypropylene (CPP) and metallocene polythene (mPE). The adhesive is one of single-component polyurethane adhesive, bicomponent polyurethane adhesive, alcohol-soluble polyurethane adhesive and water-soluble polyurethane adhesive. The overall thickness of the composite film is 25 micrometers to 150 micrometers.

Description

technical field [0001] The invention relates to the packaging field of water-gel explosives, colloidal and powdery emulsified explosives and materials with equivalent physical states. Background technique [0002] At present, plastic products have been widely used in various fields, among which plastic packaging and plastic packaging products account for an increasing share in the market, especially composite plastic flexible packaging, which has been widely used in food, medicine, chemical industry and other fields . Composite films are generally composed of two or more layers of single-layer films, while packaging materials are usually formed by welding multiple pieces of composite films using welding technology. For example, when a composite film with two layers of PE is welded at a low speed , the welding temperature only needs to reach the melting point of PE. In order to improve production efficiency, the welding temperature should be increased correspondingly when we...

AI Technical Summary

Problems solved by technology

Composite films are generally composed of two or more layers of single-layer films, while packaging materials are usually formed by welding multiple pieces of composite films using welding technology. For example, when a composite film with two layers of PE is welded at a low speed , the welding temperature only needs to reach the melting point of PE. In order to improve production efficiency, the welding temperature should be increased correspondingly when welding at high speed, otherwise the welding cannot be completed, but the ordinary PE layer is easy to be melted at high temperature , so that the seal of the packaging material has perforations of different sizes, which affects the normal use of the packaging material

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