Posts: 8
From:
Registered: Apr 2003

posted October 13, 2003 11:24 AM            

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I am extruding a polypropylene blend on a 27mm 36D twin-screw extruder. I want to mount a hopper loader directly onto the extruder. Is there any potential risk in flood feeding the extruder as opposed to starve feeding? I know that the mixing capacity will probably be reduced but this is not critical to me at the moment. I have heard that flood feeding can cause excessive wear?

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Posts: 269
From:Brodheadsville, PA USA
Registered: Jun 2001

posted October 14, 2003 09:49 PM               

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Make and style of the twin screw?

Tom Cunningham
Extrusion Technical Services

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Posts: 10
From:Hamilton
Registered: Jul 2003

posted December 30, 2003 07:31 PM            

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I've heard of Krammer Feeder that if installed on a twin screw can potentially cause wear but more importantly special attention must be paid to the amount of downward force being applied.

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Posts: 67
From:Silver City, NM, USA
Registered: Jun 2001

posted December 31, 2003 12:26 AM               

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Most twin screws use a "metering" horizontal feeder in order to control the amount of material entering the feed zone. However, if the compound bulk density is on the low side, possibly a "crammer-feeder" vertical screw in the hopper to provide a more positive material pressure on the feed zone would be helpful. Screw/barrel wear should not be a problem, unless the material is abrasive to the metal surfaces.

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