Biaxially oriented polypropylene heat-sealing film and preparation process thereof

Abstract

The invention discloses a biaxially oriented polypropylene heat-sealing film and a preparation process thereof. The biaxially oriented polypropylene heat-sealing film comprises an outer surface layer,a core layer and an inner surface layer, and is prepared by co-extruding the outer surface layer, the core layer and the inner surface layer from top to bottom. The core layer is prepared from the following components in parts by weight: 87 to 92 parts of homo-polypropylene, 5 to 10 parts of hydrogenated petroleum resin, 0.8 to 1.2 parts of nano glass powder, 0.4 to 0.8 part of calcium carbonate,0.25 to 2.5 parts of nucleating agent, 0.2 to 0.5 part of stabilizer and 0.01 to 0.2 part of antioxidant. By arranging the biaxially oriented film layer structure, the components and the preparationprocess of the biaxially oriented film layer structure, the performance of a prepared tobacco film is improved, the strength, the mechanical performance, the glossiness and the humidity of the prepared tobacco film are improved, the wear resistance and the moisture barrier capacity of the prepared tobacco film are improved, moisture condensation and permeation can be effectively prevented, the existing tobacco quality and tobacco film appearance are kept, and the film is suitable for wide popularization and use.

Description

technical field [0001] The invention relates to the technical field of cigarette films, in particular to a biaxially stretched polypropylene heat-sealing film and a preparation process thereof. Background technique [0002] The tobacco manufacturing industry is a major tax source in China. For the outer surface film of its tobacco packaging, various materials including cellophane, PVC coating film, PVDC coating film, BOPP cigarette film, etc. have been used. BOPP cigarette film is also called two-way stretch film. Stretched polypropylene cigarette film, which is co-extruded and stretched by various polypropylene functional materials, has good optical properties, wide heat-sealing range, high heat-sealing strength, strong water vapor barrier ability, Uniform thickness, wide shrinkage control range, good stiffness and other incomparable characteristics are ideal materials for cigarette packaging, but some existing cigarette films have poor wear resistance and are prone to scra...

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Problems solved by technology

[0002] The tobacco manufacturing industry is a major tax source in China. For the outer surface film of its tobacco packaging, various materials including cellophane, PVC coating film, PVDC coating film, BOPP cigarette film, etc. have been used. BOPP cigarette film is also called two-way stretch film. Stretched polypropylene cigarette film, which is co-extruded and stretched by various polypropylene functional materials, has good optical properties, wide heat-sealing range, high heat-sealing strength, strong water vapor barrier ability, Uniform thickness, wide shrinkage control range, good stiffness and other incomparable characteristics are ideal materials for cigarette packaging, but some existing cigarette films have poor wear resistance and are prone to scratches, which affect the use effect and aesthetics, and the water vapor barrier permeability is poor, which is easy to cause tobacco deterioration. In an environment with high humidity, the humid air is easy to condense on the surface of the cigarette film, showing the appearance defect of "water mist". Therefore, we propose a A kind of biaxially stretched polypropylene heat-sealing film and its preparation process

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