Melt pump gear structure

　　Gear structure can be divided into three kinds:

　　Helical (advantages: the material for the engagement of a continuous, smooth extrusion, reducing pressure fluctuations, self-cleaning, pulsating rate of 0.5% to 1% of the output pressure disadvantages: axial forces affect bearing life) can be reduce the helix angle of helical resolved.

　　Straight teeth (advantages: produce a balanced load bearing, low processing costs Disadvantages: pressure fluctuations, pulsation rate is 1% -1.5% of output pressure)

　　Herringbone gear (advantages: a steady pressure and axial force Disadvantages: high cost, shear force, the tooth root easy material retention)

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