Posts: 3
From:Coffeyville, KS USA
Registered: Jun 2004

posted June 07, 2004 04:34 PM               

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I work for a company that is producing circuit wire and building wire. With our smaller wire [(14-1, 12-1, 10-1 solid conductors) and (14-19, 12-19, and 10-19 stranded wire)] we are having a rise in sparkouts. We are extruding a PVC inner and a nylon jacket. We seem to keep getting pin holes in the insulation, which cause a sparkout and a sparkout causes scrap. Over the last year, the rate of sparkouts have risen significantly. We have been researching the problem and can not find any correlation between any changes in the process that we have made. We buy PVC resin from Georgia Gulf and color chips from Teknor color. We are trying to see if there has been some change in their products that can relate to our problem. IF ANYONE has ever seen this problem rise in wire and cable industry and found a way to correct it, please give me some advice. We are about to pull our hair out on things to try. Thanks

Brian

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Posts: 42
From:
Registered: Jul 2002

posted June 28, 2004 10:17 PM               

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I've seen this many times when wear creeps into the picture. As a result of wear, compaction on the resin takes place less aggressively and entrained air can make its way along in the process causing blow outs or grounding faults. You can try some zone setting changes to affect compaction or may need to pull the screw and check for wear (w/ the result being a more aggressive screw profile).

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Thomas Black
PPS, Inc.

www.ppsincorp.com

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