Wirenet Image Band
wirenet.org mobile image band

WAI Forums

Joomla

× If you have a question regarding coaxial, telephone, and building wire, power cable, insulation, extrusion, bunching, stranding, braiding, etc. post it here.

Compression ratios

More
6 years 5 months ago #655 by Archived Forum Admin
Does anynone know what are the typical compression ratio (feed channel / metering channel depth) and screw length (L/D) ranges for PVC, PE and halogen free/flame retardant materials (e.g. filled EVA)? For which of the above materials are double-flight screws beneficial?

Can anyone suggest further reading/information sources on screw design and applications?

Please Log in to join the conversation.

More
6 years 5 months ago #656 by Archived Forum Admin
Hello There,

Please go here and purchase the following WAI book:
www.wirenet.org/waistore/productdetail.cfm?productid=172

This should get you almost everything you are asking about. As far as filled EVA is concerned, I suggest you discuss this with your material compounder.

As far as true double flight screws are concerned (Not Barr or barrier screws), our only experience was with very accurate tubing that was made into balloon sausages and applied hot over the inner conductor of intermediate frequency coaxial cable. This was a very small extruder (1") and the output was very accurate and repeatable on LD PE. All other extruders for manufacturing wire and cable products were single screw.

Kindest regards,
Peter J. Stewart-Hay
Principal
Stewart-Hay Associates

Please Log in to join the conversation.

More
6 years 5 months ago #657 by Archived Forum Admin
hi,
L/D Compression Ratio

pvc 24-26 1.7 - 2.0 if it is plasticized pvc
hffr 20-25 max 1.2
xlpe 24-25 3.0-3.5
pe 24-26 2.5-3.0

Please Log in to join the conversation.

More
6 years 5 months ago #658 by Archived Forum Admin
Thank you vettecoupe, I'll take a look at the WAI book you suggest.

Serdar1970, thank you also for your answer.

Please Log in to join the conversation.

Time to create page: 0.310 seconds

Gallery

 

Contact us

The Wire Association Int.

71 Bradley Road, Suite 9

Madison, CT 06433-2662

P: (203) 453-2777