Extrusion Shaping
The material is fed into the propulsion system feed zone. The propeller exerts a dragging, compaction and compression action on the de-gassed plastic mass. Between the end of the propeller and the extrusion mouth there is a zone without any mechanical parts; here, the plastic body being fed by the rotary propeller accumulates.
Because there are no mechanical parts the body is able to absorb the rotation imparted by the propeller, re-densify and fill the gaps produced by the propeller and its shaft. At this point the body must be given the shape of the manufactured ceramic product, and this is done by passing it through the extrusion mouth. This stage is one of the most delicate stages of the entire process. As the thickness of the extruded body varies it will be necessary to vary the ratio between the attrition force and the pressure to which the extruded mass is subject.
To be Contd…
