The screw used in the TPU resin film blowing machine is characterized by including a screw body, which consists of a mixing section and a connecting section. The mixing section features a three-stage thread and an oblique groove. This screw design helps reduce plastic slippage, increase friction to enhance production capacity, reduce screw speed, and decrease shear force to prevent TPU cracking. The plastic enters the mixing head and uses its own inertial rotation for even dispersion. After being horizontally mixed by the three-stage thread and the oblique groove, a shark fin-shaped protrusion behind the screw increases longitudinal mixing, and the streamlined shape reduces shear force to prevent cracking due to overheating of the plastic.

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