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How does the Rubber Extruder Work?

The function of the rubber extruder is to use heat, pressure and shear to transform the solid plastic into a uniform melt and send the melt to the next process. The production of the melt involves mixing additives such as color masterbatches, blending resins, and regrinding. The finished melt must be homogeneous in concentration and temperature. The pressure must be large enough to extrude the viscous polymer.
The rubber extruder completes all the above processes through a barrel with a screw and a screw channel.
  The plastic pellets are fed into the barrel through a hopper in the barrel, and then conveyed to the other end of the barrel by a screw. In order to have sufficient pressure, the depth of the threads on the screw decreases as the distance to the hopper increases. External heating and internal heat due to friction between the plastic and the screw soften and melt the plastic. Different polymers and different applications often have different design requirements for extruders.
  
  Many options involve discharge ports, multiple feeding ports, special mixing devices along the screw, cooling and heating of the melt, or no external heat source (exhaust extruder), the gap between the screw and barrel varies relatively size, and the number of screws. For example, twin-screw extruders allow for more thorough mixing of the melt than single-screw extruders. Tandem extrusion is a melt extruded from one rubber extruder, fed as a feedstock to a second rubber extruder, typically used to produce extruded polyethylene foam.

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