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.