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| Author | Topic: Groove feed Extruder |
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ac Member Posts: 1 |
posted September 02, 2004 02:13 PM
  
I would like to know if anyone has experience running flexible PVC on groove feed extruder for wire & cable application. We are experiencing severe screw wear problem. The screw is completely worn out in just 18 months. We installed a new screw about one month ago but that has also developed rough edges on the barrier section. Please let me know if anyone has experienced similar problems with groove feed extruders. IP: Logged |
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Tom C Moderator Posts: 361 |
posted September 02, 2004 02:26 PM
I have not heard of that many PVC operations using a grooved feed throat. Seems to me that PVC generally has good output which makes a grooved feed uneccesary. Additionally the grooves can sometimes act as hang up points and allow resins like PVC to degrade. The wear you are expereincing is likely due to the very high pressure that grroved feeding can produce. Most screw desgns are not pressure balanced side to side and the resultant screw deflection can cause high amount of wear. There are screw designs which can better balance the pressure and reduce the wear. Additionally highly viscous polymers sometimes do not provide a very good hydraulic bearing for the screw flight tips allowing metal contact and wear. Sometimes grooves are like a 1000HP engine in your car. You can go really fast, but there are of lot of other issues to consider. Tom C [This message has been edited by Tom C (edited September 02, 2004).] IP: Logged |
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