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| Author | Topic: extruding pet/hdpe blend |
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pedro viana Member Posts: 4 |
posted December 11, 2005 04:42 PM
   
I´ve changed for a vented extruded as recommmend here,with good results,but now i´m trying to extrude pet/hdpe with the same equipment;i´ve heard it´s easier and need no predrying? i apreciate comments, thanks in advance IP: Logged |
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Tom C Moderator Posts: 742 |
posted December 11, 2005 05:17 PM
PET/HDPE? These resins are incompatible. What are you trying to do? ------------------
Tom Cunningham
Extrusion Technical Services www.ExtrusionTechnicalServices.com IP: Logged |
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pedro viana Member Posts: 4 |
posted July 31, 2006 05:06 PM
sorry for answer delay,my PC was unable... PET/hdpe blend is possible with the use of compatylizers,as far i know there are at least three companies in europe doing so.. IP: Logged |
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Tom C Moderator Posts: 742 |
posted July 31, 2006 08:30 PM
The thermocouple tip shou be located as close as possible to the inner wall of the barrel. Typically it is placed about 0.25" from the inner wall. The thermocouple should also be located an average distance from all heating elements in a zone. This would mean centered along the axis and not to close to any heating element. In fact the thermocouple should be sheilded from all heating and cooling effects. I would chose to put the first zone thermocouple closer to the feed throat if your material generally used cool first zone temperatures (cooling on mostly). I would place it further away from the feed throat if your polymer required high first zone temperatures (heat on mostly). Things get much more involved than this if you care to investigate. ------------------ Tom Cunningham www.ExtrusionTechnicalServices.com IP: Logged |
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