Feed zone of a screw extruder, which uses forward transmission components with larger pitch, can gain a larger feed capability. Besides, feed zone will compact the powder filler by following measures in order to promote melting and plasticization of materials:
a. Part the modular screw (such as co-rotating twin screw and screw of disc extruders) in order to descend pitch change.
b.Reduce the pitch of non-modular screw gradually.
It is the fluctuation of feed that make the distribution and mixture of materials become particularly important. It is directly related to the consistency of the product.
As for parallel counter-rotating twin screw, the mixture capability of screw can be improved by several measures, such as enlarging the space between screw diameter and barrel wall on the solid transmission part and mixture part, setting reaction thread on pre-plasticization part of screw, setting the kneading disc and so on.