extrusion and screw design

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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