Top left the melting module is shown, while top right it can be seen a cascade combination of a melting module followed by a mixing module.

On the right side is visible the schematic section of the Melting Unit. We observe the plastic solid particles falling down into SCP (Shearing Channel Pump) feed port. In SCP a grooved rotor and a smooth rotor cooperate to in-take the particulate resin and press against the hot rotor of the processor, which rotates clockwise. The static channel encased into the bush is tapered thus promoting compaction and melting. As soon as enters in forced contact with the hot rotor wall, the resin melts quickly while dragged toward the exit, over the pumping section.

Looking to the cross section, the red colored melt enters in the mixing chamber, spread over the rotor, in a clockwise direction and fills up the mixing chamber up to a certain circumferential level, depending on the processing target. Downstream, the pumping section provides to discharge the melt through the exit die (extrusion die, Nexxus DEGASSING or others).

On the right side the section of the Degassing Chamber is shown. Similarly to Nexxus Mixing also in Nexxus Degassing a thin melt film is spread by a spreading die over the rotor surface. The melt film thickness can be adjusted by changing some modular parts. The degassing chamber has to remain rigorously empty for the vacuum to be applied. In other terms the melt film attached to the rotor remains spaced apart from the static channel of the bush and doesn’t undergo any drag nor shear flow, for all time it travels along with the degassing chamber.

Since no drag flow occurs in the degassing chamber, the melt film is displaced by the running rotor like a carpet by a belt conveyor. At the end of the degassing chamber, the pumping section provides delivering the melt to the discharge port. The filling factor of the degassing chamber is controlled by a pressure transducer fixed at the beginning of the pumping zone. A simple closed loop between that pressure value and the rotor speed, keeps the degassing chamber always empty for effective gas removal.