The design of the gear structure of the melt metering pump plays a key role in the operation of the metering pump. If the ordinary involute helical gears with a pressure angle of 20 degrees are used, the helical gears can increase the meshing overlap of the gears of the melt metering pump, and the meshing can be used to provide continuous and smooth extrusion of the material and reduce the pressure fluctuation. In addition, helical gears also have a certain self-cleaning effect, which can avoid the decomposition of material deposits.

Polymer melt pump gears using helical gears, although in the reduction of pressure fluctuations and self-cleaning has great advantages, but this form of gears in the work of axial force, affecting the service life of the bearings, but also exacerbate the degree of shear of the melt in the gap between the tooth side, reducing the volume of the melt metering pump.

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