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

1. Presented at “NRC - 2015” June 19 – 20, Mumbai

2. GOALGOAL
Extrusion Of Rubber Compounds
 Safety (Temperature)Safety (Temperature)
 Highest OutputHighest Output
 Consistent QualityConsistent Quality

3. OutputOutput
TemperatureTemperature AppearanceAppearance
IDEALIDEAL OperatingOperating
PointPoint

4. ACTUALACTUAL OperatingOperating
PointPoint
 PRODUCT:
 PROCESS:
 MACHINE:
Deformed TriangleDeformed Triangle

5. SCREWSCREW
KeyAspectsKeyAspects
 DESIGNDESIGN
 MATERIALTECHNOLOGYMATERIALTECHNOLOGY
 MANUFACTURINGACCURACYMANUFACTURINGACCURACY

6.  FLIGHTS:
Increase Of
No. of Flights
Increase Of
No. of Flights
Decrease InDecrease In
Output

7.  PITCH:
Increase OfIncrease Of
Pitch
Increase InIncrease In
Output

8.  CORE DIAMETER:
Increase Of
Core Diameter
Increase Of
Core Diameter
Decrease InDecrease In
Output

9. FEW DESIGNSFEW DESIGNS
ScrewScrew
^^

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. EXTRUSION OUTPUT OF HOT FEED SCREW DESIGNSEXTRUSION OUTPUT OF HOT FEED SCREW DESIGNS
Source: HF Mixing

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. STANDARD SCREW
• 6 Flight Inlet Section
• Constant Pitch
• Constant Core Diameter

14. HIGH PERFORMANCE
HOMOGENIZATION SCREW
• 6 Flight inlet Section
• Constant Pitch (larger than standard screw)
• Constant Core Diameter

15. SCREW WITH THICKENED CORE
• 6 Flight inlet Section
• Constant Pitch
• Constant Core Diameter (larger than standard screw)

16. COMPRESSION SCREW
• 2 Flight inlet Section
• Variable Pitch
• Increasing Core Diameter from Inlet To Tip

17. COMPRESSION SCREW WITH HIGHER
HOMOGENIZATION
• 6 Flight inlet Section
• Variable Pitch
• Increasing Core Diameter from Inlet To Tip

18. DECOMPRESSION SCREW
• 6 Flight inlet Section
• Constant Pitch
• Decreasing Core Diameter from Inlet To Tip

19. EXTRUSION OUTPUT OF COLD FEED SCREW DESIGNSEXTRUSION OUTPUT OF COLD FEED SCREW DESIGNS
Source: Konstrukta
965 1090 1104965 1090 1104

20. ACTUAL OPERATING POINTACTUAL OPERATING POINT –– HOW IT LOOKS ?HOW IT LOOKS ?
Source: Konstrukta

21. COLD FEED EXTRUDERS

22. Photo:Troester

23. CO-EXTRUSION

24. ROLLER HEAD TECHNOLOGY

25. EXTRUSION HEADS

26. EXTRUSION LINES

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and Business Leader. Email us at rubbermachineryworld@gmail.com
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