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aspect ratio: for the effective working length of the screw and screw diameter ratio.
a, large aspect ratio is even easy to eat the material;
b, better thermal stability of the plastic can be used to improve the longer screw without mixing of the burning, poor thermal stability of the plastic can be shorter end of the screw or screw without thread. Plastic properties to consider, such as under the general stream length: thermosetting 14 \ '16, rigid PVC, PU and other heat-sensitive high viscosity of 17 \ '18, usually plastic to 18 \ '22, PC, POM and other high-temperature stability of plastic 22 \ '24.
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