Melt-blown cloth machine extruder variable depth and pitch screw

The variable depth and pitch screw means that the screw groove depth and the thread rise angle change gradually from the beginning of the feeding section to the end of the homogenization, that is, the thread lift gradually narrows from wide, and the screw groove depth gradually becomes shallower. The screw has the characteristics of the previous two screws, but mechanical processing is more difficult and less used.