The invention discloses a production process of a protective film. A film blowing
processing device comprises a first motor, a melt extruder, a feeding hopper, a second motor, a guide plate, a
film blowing machine, a rack, a first limiting plate, a heat absorption
pipe, a protective film, a first rotating shaft, a first rotating wheel, a supporting plate, a second rotating shaft, a second rotatingwheel, a second limiting plate, a third limiting plate, a connecting shaft, a shearing base, bolts, cutters, a guide wheel, a third motor and a receiving wheel. The production process is simple in structure and convenient to operate, through cooperation of the melting feeding hopper, the second motor and the guide plate, the structure is simple, use is convenient, and the purpose of automatic quantitative material guide is achieved; through cooperation of the rack and the heat absorption
pipe, the structure is simple, and the purpose of rapid cooling forming of protective films is achieved; and through cooperation of the connecting shaft, the shearing base, the bolts, the cutters, the third motor and the receiving wheel, the structure is simple, and the purpose of automatically
cutting protective films of different sizes is achieved by adjusting the distance between the cutters.