Extrusion and Screw Design

6,230 views 29 slides Jun 20, 2015
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About This Presentation

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


Slide Content

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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