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Innovation in Rubber Extrusion Process
The advantages of extrusion via a gear pump is a well known fact in the domain of the plastic industry, where the services of gear pumps have been effectively utilised. Some of the benefits of the gear pumps include an effective pressure build-up, constant throughput and dimensional accuracy of the extrudate.

However it is only in recent years that the benefit of the gear pumps have been extended to the rubber extrusion process. Though this implementation in the rubber industry was not smooth because of the vulnerability of the gear pump as well as high compound viscosities. The following is a schematic of the extruder-gear pump combination.

Extruder Gear Pump Combination

The plasticizing attributes of the extruder are used for proper masticating of the compound and to feed the gear pump. The gear pump generates high die pressures without excessive temperatures. The gear pump and the extruder perfectly complement each other. Actually the extruder screw can plasticize, but does not have the conveying efficiency on the other hand the gear pump though highly efficient material conveyor, but lacks the ability to plasticize.

Advantages of the Gear Pump
Using the gear pump in the rubber extrusion process offers the following advantages in an extrusion line.
Sponge Extrusion
Sponge extrusion is a relatively new addition to the rubber extrusion process. They are closed-cell cellular profiles that are made up of high quality rubber often Silicone, EPDM or Neoprene. Sponge extrusion offers diversified Sponge Extrusionshapes and sizes like cords, tubes rectangular profiles etc. Sponge rubbers are applied for use in seals and gaskets where compression forms the main sealing method.

They can be used in applications where there is a chance of accommodating large tolerances. Some of the typical shapes available are shown here.

Advantages of Sponge extrusions
Sponge extrusion shapes

Processing Silicone Sponge

A standard silicone extrusion equipment is used for processing of silicone sponge. Let's discuss about some aspects of the production methods.
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