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| Author | Topic: extruding upvc pipes |
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elhifnawyplast Member Posts: 1 |
posted March 18, 2005 07:18 PM
   
i am new in extruding upvc from powder compound,i have a twin screw pagani extruder 65 screw diameter and 16 Kw motor,when using for zone 1 the feed zone the temperature of 150 cel,zone 2 160 cel,zone 3 159 cel,zone 4 160 cel,adaptor temperature at 170 cel and braker orfice at 165 cel without mounting the rest of die,the extrudate comes out having some powder and allso some powder from the vents. disassembling orfice there is signs of degradation the screw RPM is 30 .pls some one help what is wrong. This message has been edited by elhifnawyplast (edited March 19, 2005).] [This message has been edited by elhifnawyplast (edited March 19, 2005).] IP: Logged |
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zabielski Senior Member Posts: 360 |
posted April 09, 2005 07:38 AM
Well, for one thing, I think your temperatures may be a little to hot. Secondly - without mounting the die, which adds to back pressure, your not getting any mixing done. Now, without adding insult to injury, without knowing what you have synergistically as a heat stabilizer package, it may be to "light" on ingrediants. Put the die on, start at lower temperatures, and slowly ramp up to the speed your trying to achieve. While doing this, watch the melt temperature, and if your getting powder out, start increasing the temperature at 5 *C intervals. Have patience too. Find out exactly who's adding the heat stabilizer(s) and what the levels are. If you continue what your doing, all the heat that is applied is accumulative. By the time you bolt on the die, the dehydrochlorination continues, and you'll wind up with burned product. It sounds like your material is already in the degradation stage. IP: Logged |
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