EPDM extrusion screw design

Hello Everybody
Can anyone please help me to find the "ideal" screw design for EPDM extrusion?
Type of screw:
L/D:
Compression ratio:

Thanks anyway in advance

Bye

Hello Bighead;

Wow, that is a very good question.

We suggest you discuss this with your EPDM/ EPR supplier and perhaps with one or two extruder manufacturers and then let us all know what the latest thinking is. It would be really great if you got involved and helped others watching this particular thread.

Sincerely,
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com

hi,
screw diameter screw length screw speed
60mm 14-D 1-60
90mm 16-D 1-60
120mm 18-D 1-50
150mm 20-D 1-50
200mm 20-D 1-37

We have moved this older thread up to the "front of the line" so to speak because we are still looking for input. Your help would be greatly appreciated.

Sincerely,
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com

Hello Sr.
We have already received a screw manufactured by Genca. The screw was manufactured for a Davis Standard extruder (6" 24:1). The screw has a low compression ratio (1.2) and a barrier flight located in the compression zone of the screw. We have tested the screw using EPDM and NBR as compounds and the power consumption of the main motor of the extruder went down more than 50%.

Thanks for your cooperation and interest

Thank you very much for the information bighead. It is very interesting and I am sure other readers will much appreciate you letting us know.

Sincerely,
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates
www.Stewart-Hay.com