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Functions of Screws:
1.      Feed the resin consistently
2.      Melt the resin uniformly
3.      Pump the fluid steadily
4.      Mix the resin homogeneously
The base parameters for each section of the injection Molding Screw and Extrusion Screw are described below.
Feed Section
Lengths should be to a minimum, based on projected shot size. Excessive length is wasted processing space. Front or push side flight radius very small for proper feeding, back or trailing side radius should be larger to increase strength and can be used to control input volume.

Transition Section
Very long compression length impart the shear or drive energy more uniformly, allow more electrical energy into the process and increase the length and effect of any back pressure applied.

Meter Mix Section
Shorter length can be adequate when using a type of distributive mixer to interrupt the problems associated with lamina flow, in the screw, nozzle body and hot runner systems.

Compression Ratios
Much higher compressions that range from 3.2 – 3.8:1 can be used, the shear impact is more that overcome with a long transition length. The required compression should be lower for longer L/D screws and higher for lower L/D Screws.

Flight Depth
Without making major reductions in the screws output or recovery times, depths should be kept low. Less material in the screw improves overall control over process and increase the window of materials that can be processed.

The General Purpose Screw, if designed properly, can perform these functions satisfactorily.

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