g screw some of the details in the design is worth to explore and analysis.

About plasticizing screw silica gel

Solid silica gel material from the feed hopper into the screw thread groove (screw channel) However, as the screw rotation speed and melt tube (barrel) shearing effect created the role, so raw material mixing silica gel and along the screw thread slot transmission, so that solid material by melting silica gel tube outside the heating film produced by shear heating and the screw under heat, so that melting temperature and melting plastic tube into the melt within the body.