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| Author | Topic: Another groove feed question. |
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Tom C Moderator Posts: 378 |
posted September 11, 2004 10:17 AM
   
Is anyone extruding Nylon using a grooved feed throat? If yes, is the extruder vented? If un-vented, and using Nylon or any other resin, do you have problems with bubbles in the product? My own expereince with grooves involves vented extruders. If the extruder is grooved, but un-vented, there is a good theoretical case for trapping air and carring it to the die when processing hard resins like nylon. I'm not sure if this is the actual expereince of processors though. Thanks, Tom C IP: Logged |
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TomBlack Moderator Posts: 54 |
posted September 30, 2004 06:08 PM
Tom, Done it a number of times including non-vented injection molding of nylon w/ grooved feedthroats. Very successful in achieving high recovery rates by eliminating "windmilling." ------------------ www.ppsincorp.com IP: Logged |
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Bob Cunningham Senior Member Posts: 90 |
posted September 30, 2004 07:00 PM
We have done it in the past in our lab, but we don't do it much in the real world. We were able to mix/melt/pump okay, as long as the screw didn't lock up. We figured out how to get around that, but we still usually have a smooth-bore for nylon. We never saw air bubbles. -Bob Cunningham [This message has been edited by Bob Cunningham (edited September 30, 2004).] IP: Logged |
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