Transcription of EXTRUSION Troubleshooter - Plastics Touchpoint
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EXTRUSION Troubleshooter - Plastics Touchpoint
March Paul WallerPlastics Touchpoint Group, to Fix Ugly Rolls Appearance counts. Ugly rolls offilm are often rejected, even when thegauge variation of the film itself is wellwithin specification. It is often impos-sible to measure the slight gauge vari-ation that can build up over thousandsof layers to produce a bump in the rolldiameter. So operators must under-stand how to diagnose the cause orcauses of deformed rolls and adjustwinding for changes in raw materials,processing conditions, and winders use some combinationof nip pressure, web tension, and drivetorque to control film winding.
www.ptonline.com March 2005 41 EXTRUSION Troubleshooter causes are winding film too warm or applying too much web tension or lay-on pressure. This problem can also occur with coextruded film where the
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