Preparation process of biodegradable plastic film

Abstract

The invention relates to a preparation process of a biodegradable plastic film, which uses cutting equipment. The cutting equipment comprises a bottom plate, a winding roller, an unwinding roller, a winding motor and a cutting device. The preparation process of the plastic film by adopting the cutting equipment specifically comprises the following process flow of melt extrusion, huffing and molding, cooling and shaping, cutting and winding; and the cutting device comprises a mounting frame, a punching mechanism, a connecting frame, a connecting sliding block, a rotating cam, a rotating motor,a workboard, a stretching sucking disc and a cutting mechanism. According to the preparation process, after bubbles are stretched outwards, a plurality of round holes are formed in the upper ends of the bubbles by the punching mechanism, and then the upper ends of the bubbles are cut by the cutting mechanism. Compared with a bubble cutting method which directly uses a blade, the resistance of a cutting blade is obviously reduced during operation, the condition of irregular cut edges due to pulling can be prevented, and in addition, the cut edges can be prevented from being retracted inwards byapplying suction force to the edge of the film after cutting is performed.

Description

technical field [0001] The invention relates to the technical field of degradable plastic films, in particular to a preparation process for biodegradable plastic films. Background technique [0002] Biodegradable plastics refer to a class of plastics that are degraded by microorganisms that exist in nature, such as bacteria, molds (fungi) and algae. Plastic films processed from biodegradable plastics are called biodegradable plastic films. [0003] Biodegradable plastic films are often processed by blow molding. The film produced by blow molding is a double-layer film obtained by flattening cylindrical bubbles. In order to obtain a single-layer film, the double-layer film needs to be cut. , there are the following problems in the cropping process: [0004] (1) Existing equipment is often in direct contact with the film through the cutting tool when cutting. The film has a certain degree of elasticity, so the cutting tool is subjected to relatively large resistance when work...

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Problems solved by technology

[0004] (1) Existing equipment is often in direct contact with the film through the cutting tool when cutting, and the film has a certain degree of stretchability, so the resistance encountered by the cutting tool is relatively large when it is working, and the film cannot be cut quickly. Pulling occurs between the cutting process and the cutting tool, resulting in jagged folds at the incision, which affects the appearance quality of the finished film

[0005] (2) After the film is cut, the edge of the incision of the film will retract inward due to the tension of the film itself. If the edge of the incision is not processed in time, the edge part retracted inward will be folded on the At the same time, the thickness at the edge of the film is increased, and the middle of the film cannot be tightly attached together, resulting in a large gap in the middle of the roll-shaped film after rolling, and the overall shape is tight on the outside and loose on the inside. The film is vibrating and bumpy during transportation. Easy to loosen

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