Posts: 1
From:France
Registered: Nov 2005

posted November 24, 2005 05:39 AM               

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Dear all,

We are thinking about a new screw design (D=45; L/D =25) for reaching high output (50kg/hr). We have a grooved barrel on 5D. Old screw used in the past has double flight in the conveying zone but are not able to reach 50kg/hr at modferate RPM. So we plan to use a single flight with large pitch in the conveying zone. My question : Does the friction coefficient on the barrel change with this large conveying volume ? How to be sure to maintain high friction coef if we increase the conveying volume ?
Thanks in advance for your comments.

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Posts: 648
From:Brodheadsville, PA USA
Registered: Jun 2001

posted November 24, 2005 09:20 AM               

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You shoud expect about 0.5kg/hr/rpm using grooved feed at your diameter.

If you are already getting 0.5 kg/hr/rpm you should be careful regarding screw design in the feed area, which could increase wear and power consumption without gain in output.

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Best Regards,

Tom Cunningham

Extrusion Technical Services
www.ExtrusionTechnicalServices.com

[This message has been edited by Tom C (edited November 24, 2005).]

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