VMCPP film with high aluminium layer adhesive force

Abstract

The invention relates to a VMCPP film with a high aluminium layer adhesive force. A base film is produced by adopting a three-layer co-extrusion tape-casting method. The three layers are a corona layer, an intermediate layer and a heat-sealing layer respectively. Detection results of the aluminum plating adhesive force are higher than 3.0 N / 15 mm that is more than 5 times of the adhesive force of a common aluminum plating film. The thickness ratio of the three layers are that the thickness ratio of the corona layer is 5-30%, the thickness ratio of the intermediate layer is 10-85% and thickness ratio of the heat-sealing layer is 10-30%. By utilization of characteristics of acrylate polymer materials, the adhesion strength of an aluminum layer and polypropylene is enhanced, thus achieving effects of enhancing the adhesive force of aluminum plating layers. The acrylate polymer has good molten miscibility with the polypropylene, and is free of influence on physical properties of the film. In addition, the polarity of the material is in good affinity with aluminum, thus enhancing the adhesive force between the aluminum plating and the corona layer polypropylene.

Description

technical field [0001] The patent of the invention relates to a vacuum aluminized VMCPP film with high aluminum layer adhesion, which is used in the fields of printing, compounding and packaging, and is suitable for packaging of food, medicine and daily chemical products. Background technique [0002] Due to its excellent barrier properties to water vapor and oxygen, the vacuum aluminized film has been widely used in the food packaging industry. However, after ordinary vacuum aluminized cast film is compounded with other films, the aluminum layer will transfer or the peeling force will be too small, resulting in easy delamination of the composite film, which seriously affects the shelf life of the product. Ordinary vacuum aluminized cast film generally adopts a three-layer structure: corona layer, intermediate layer, heat seal layer, the corona layer uses a blend of acrylic polymer and polypropylene, the middle layer uses homopolypropylene, and the heat seal layer Co-polypr...

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Problems solved by technology

[0003] The corona layer described in the patent of patent application number 200710133787.9 is composed of isotactic homopolypropylene or copolymerized polypropylene, polyolefin elastomer that can be melt-mixed with polypropylene, and anti-sticking agent. Increase the adhesion of the coating to 1.0 Newton, which has made some progress compared with the adhesion of 0.6 Newton of the ordinary vacuum aluminized cast film aluminum coating, but it still cannot meet the needs of the people

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