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| Author | Topic: processing of pvc rigid sheets |
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slkoli Member Posts: 2 |
posted January 13, 2005 01:34 AM
   
we have a' theyson twins screw counter rotating parallel extruder and we manufactures pvc rigid sheet,thickness range from 1 to 12mm but we have problem , as we start the extruder initial one and half hours excess flow comes out from both edge.we uses lead as the stablerizer. can anyone tell me how to solve this problem to reduce scrap. IP: Logged |
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Tom C Moderator Posts: 435 |
posted January 13, 2005 10:10 AM
It is likely that initially the die is hotter than the product. The extra contact the polymer has with the die metal near the edges causes the polymer to warm up and flow faster. As time goes on, either the polymer entering the die becomes hotter as the extruder equilabrates, or the die cools down at the edges giving you the flow balance you want. The best solution would be temperature control zones at the die edges where you would modify temperature to control flow.
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slkoli Member Posts: 2 |
posted January 18, 2005 12:58 AM
THANKS TOM FOR YOUR COMMENTS. IP: Logged |
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