extrusion and screw design
TRANSCRIPT
Presented at “NRC - 2015” June 19 – 20, Mumbai
GOALGOAL Extrusion Of Rubber Compounds
Safety (Temperature) Safety (Temperature)
Highest OutputHighest Output
Consistent QualityConsistent Quality
Output Output
Temperature Temperature Appearance Appearance
IDEALIDEAL Operating Operating PointPoint
ACTUALACTUAL Operating Operating PointPoint
PRODUCT:
PROCESS:
MACHINE:
Deformed TriangleDeformed Triangle
SCREWSCREW
Key Aspects Key Aspects DESIGNDESIGN
MATERIAL TECHNOLOGYMATERIAL TECHNOLOGY
MANUFACTURING ACCURACYMANUFACTURING ACCURACY
FLIGHTS:
Increase Of
No. of Flights
Increase Of
No. of Flights
Decrease In Decrease In
Output
PITCH:
Increase Of Increase Of
Pitch
Increase In Increase In
Output
CORE DIAMETER:
Increase Of
Core Diameter
Increase Of
Core Diameter
Decrease In Decrease In
Output
FEW DESIGNSFEW DESIGNS ScrewScrew
^̂
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
EXTRUSION OUTPUT OF HOT FEED SCREW DESIGNS EXTRUSION OUTPUT OF HOT FEED SCREW DESIGNS
Source: HF Mixing
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
STANDARD SCREW • 6 Flight Inlet Section
• Constant Pitch
• Constant Core Diameter
HIGH PERFORMANCE
HOMOGENIZATION SCREW • 6 Flight inlet Section
• Constant Pitch (larger than standard screw)
• Constant Core Diameter
SCREW WITH THICKENED CORE • 6 Flight inlet Section
• Constant Pitch
• Constant Core Diameter (larger than standard screw)
COMPRESSION SCREW • 2 Flight inlet Section
• Variable Pitch
• Increasing Core Diameter from Inlet To Tip
COMPRESSION SCREW WITH HIGHER
HOMOGENIZATION • 6 Flight inlet Section
• Variable Pitch
• Increasing Core Diameter from Inlet To Tip
DECOMPRESSION SCREW • 6 Flight inlet Section
• Constant Pitch
• Decreasing Core Diameter from Inlet To Tip
EXTRUSION OUTPUT OF COLD FEED SCREW DESIGNS EXTRUSION OUTPUT OF COLD FEED SCREW DESIGNS
Source: Konstrukta
965 1090 1104965 1090 1104
ACTUAL OPERATING POINT ACTUAL OPERATING POINT –– HOW IT LOOKS ?HOW IT LOOKS ?
Source: Konstrukta
COLD FEED EXTRUDERS
Photo: Troester
CO-EXTRUSION
ROLLER HEAD TECHNOLOGY
EXTRUSION HEADS
EXTRUSION LINES
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