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Extrusion and Screw Design

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Rubber extrusion is in itself a vast subject, and when you know the basics outlined in this presentation, you have made a knowledgeable start.

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Extrusion and Screw Design

  1. 1. Presented at “NRC - 2015” June 19 – 20, Mumbai
  2. 2. GOALGOAL Extrusion Of Rubber Compounds  Safety (Temperature)Safety (Temperature)  Highest OutputHighest Output  Consistent QualityConsistent Quality
  3. 3. OutputOutput TemperatureTemperature AppearanceAppearance IDEALIDEAL OperatingOperating PointPoint
  4. 4. ACTUALACTUAL OperatingOperating PointPoint  PRODUCT:  PROCESS:  MACHINE: Deformed TriangleDeformed Triangle
  5. 5. SCREWSCREW KeyAspectsKeyAspects  DESIGNDESIGN  MATERIALTECHNOLOGYMATERIALTECHNOLOGY  MANUFACTURINGACCURACYMANUFACTURINGACCURACY
  6. 6.  FLIGHTS: Increase Of No. of Flights Increase Of No. of Flights Decrease InDecrease In Output
  7. 7.  PITCH: Increase OfIncrease Of Pitch Increase InIncrease In Output
  8. 8.  CORE DIAMETER: Increase Of Core Diameter Increase Of Core Diameter Decrease InDecrease In Output
  9. 9. FEW DESIGNSFEW DESIGNS ScrewScrew ^^
  10. 10. STANDARD SCREW • 2 Flight Inlet Section • Decreasing Pitch For Compression • Constant Core Diameter IMPROVED SCREW • 1 and ½ Flight Screw • Constant Pitch • Increased Core Diameter at Outlet for Compression
  11. 11. EXTRUSION OUTPUT OF HOT FEED SCREW DESIGNSEXTRUSION OUTPUT OF HOT FEED SCREW DESIGNS Source: HF Mixing
  12. 12. COLD FEEDCOLD FEEDCOLD FEEDCOLD FEED VsVs HOT FEEDHOT FEED L/D RATIO HIGHER FOR CFEL/D RATIO HIGHER FOR CFEL/D RATIO HIGHER FOR CFEL/D RATIO HIGHER FOR CFE SCREWSCREW
  13. 13. STANDARD SCREW • 6 Flight Inlet Section • Constant Pitch • Constant Core Diameter
  14. 14. HIGH PERFORMANCE HOMOGENIZATION SCREW • 6 Flight inlet Section • Constant Pitch (larger than standard screw) • Constant Core Diameter
  15. 15. SCREW WITH THICKENED CORE • 6 Flight inlet Section • Constant Pitch • Constant Core Diameter (larger than standard screw)
  16. 16. COMPRESSION SCREW • 2 Flight inlet Section • Variable Pitch • Increasing Core Diameter from Inlet To Tip
  17. 17. COMPRESSION SCREW WITH HIGHER HOMOGENIZATION • 6 Flight inlet Section • Variable Pitch • Increasing Core Diameter from Inlet To Tip
  18. 18. DECOMPRESSION SCREW • 6 Flight inlet Section • Constant Pitch • Decreasing Core Diameter from Inlet To Tip
  19. 19. EXTRUSION OUTPUT OF COLD FEED SCREW DESIGNSEXTRUSION OUTPUT OF COLD FEED SCREW DESIGNS Source: Konstrukta 965 1090 1104965 1090 1104
  20. 20. ACTUAL OPERATING POINTACTUAL OPERATING POINT –– HOW IT LOOKS ?HOW IT LOOKS ? Source: Konstrukta
  21. 21. COLD FEED EXTRUDERS
  22. 22. Photo:Troester
  23. 23. CO-EXTRUSION
  24. 24. ROLLER HEAD TECHNOLOGY
  25. 25. EXTRUSION HEADS
  26. 26. EXTRUSION LINES
  27. 27. This site is promoted by Prasanth Warrier, who recently stepped down as CEO of a leading rubber machinery manufacturer. He is a B2B Strategist, Marketing, Communications & Business Development Consultant, Speaker and Business Leader. Email us at rubbermachineryworld@gmail.com Who We AreWho We AreWho We AreWho We Are Rubber Machinery World provides authentic information on various aspects of machinery and equips buyers in the global rubber and tire industry to wisely source the right machinery (from the right supplier). Website Accessible on Desktop, Smart Phones & TabsWebsite Accessible on Desktop, Smart Phones & Tabs
  28. 28. Email:Email: rubberm ac hin ery w o r ld @g m ai l. co mrubberm ac hin ery w o r ld @g m ai l. co m

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