Extrusion and Screw Design

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. Output Output
Temperature Temperature Appearance Appearance
IDEALIDEAL
Operating Operating
PointPoint

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

5. SCREWSCREW
Key Aspects Key Aspects
 DESIGNDESIGN
 MATERIAL TECHNOLOGYMATERIAL TECHNOLOGY
 MANUFACTURING ACCURACYMANUFACTURING ACCURACY

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

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

8. CORE DIAMETER:
Increase Of
Core Diameter
Increase Of
Core Diameter
Decrease In Decrease 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 DESIGNS EXTRUSION OUTPUT OF HOT FEED SCREW DESIGNS
Source: HF Mixing

12. COLD FEED COLD FEED COLD FEED COLD FEED
Vs Vs
HOT FEEDHOT FEED
L/D RATIO HIGHER FOR CFEL/D RATIO HIGHER FOR CFE L/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 DESIGNS EXTRUSION OUTPUT OF COLD FEED SCREW DESIGNS
Source: Konstrukta
965 1090 1104965 1090 1104

20. ACTUAL OPERATING POINT ACTUAL 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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Marketing, Communications & Business Development Consultant, Speaker
and Business Leader. Email us at [email protected]
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