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The production process and principle of the film blowing machine
are as follows: Dry polyethylene particles are added to the lower hopper. The particles enter the screw from the hopper by their own weight. When the particles come into contact with the bevel of the screw, the rotating bevel generates a thrust perpendicular to the bevel, pushing the plastic particles forward. During this process, the plastic gradually melts due to friction between the screw and the barrel, the plastic and the barrel, and the collision and friction between the particles, as well as due to external heating of the barrel. The molten plastic is filtered through the die to remove impurities, and then emerges from the die. It is cooled by the air ring, inflated, and passed through the herringbone plate, traction rollers, and then wound into a roll.