S. C. Dey & Co. Offers Twine Screw Extruder. S. C. Dey & Co. Manufactures testing instrument for Material & Petroleum Testing. The Twin Screw Extruder is used to screw for continuously plastifying and mixing powder or granular thermoplastics and elastomer. It incorporates a hardcrome barrel bore having grinding finish and the screws are nitride. This Twine Screw Extruder features screw rotating at a fixed speed by Gears-Gearbox -Motor assembly at approx. 30/60 rpm.