Posts: 36
From:germany
Registered: Nov 2006

posted July 26, 2007 04:40 PM            

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Dear All,

Does anyone have idea of gel formation during fluoropolymer melt extrusion. what is the cause and how to reduce or to stop the formation.

thanks in advance.

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Posts: 889
From:Brodheadsville, PA USA
Registered: Jun 2001

posted July 26, 2007 04:54 PM            

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Fluoropolymers tend to have strong degradation tendancies, and are difficult to melt. Degradation product are usually low molecular weight. I would suspect unmelted material before gels.

Can you section the offending piece and look at it microscopically?

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Best Regards,

Tom Cunningham

www.ExtrusionTechnicalServices.com

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Posts: 9
From:Avon, CT
Registered: May 2005

posted August 01, 2007 10:32 AM            

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Good general articles about gel formation
http://www.ptonline.com/articles/200203ts1.html http://www.ptonline.com/articles/200312ts1.html

[This message has been edited by AlexK (edited August 01, 2007).]

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Posts: 34
From:Easton, Pa U.S.A.
Registered: Aug 2005

posted September 12, 2007 12:47 PM            

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Pitted surface is too cold.
Streaking or striations is too hot.
What type of fep?
What color?
Melt flow #?
Breaker or no breaker

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Need medical Tubing ?

[This message has been edited by mademan5284 (edited September 12, 2007).]

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