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Suggestions for Purging Extruders

  1. Remove die, adapters, clamp rings, breaker plate and screen pack. OPENING MUST BE FREE OF RESTRICTIONS.
  2. Clean out all polymer from hopper.
  3. Keep barrel temperature at normal for purging polymer. Raise the extruder temperatures to 450 F. Use 450-550 F when purging ABS, nylon, polycarbonate, PET or other high temperature resins.
  4. Feed ULTIMAX PURGING COMPOUND into barrel, a small quantity at a time. Run screw slowly. Do not use stuffer but allow compound to enter equipment by gravity feed. If it doesn’t feed smoothly, raise temperature in increments of 10o F until it does. Total purging compound should not exceed two pounds per inch of screw diameter.
  5. When purging compound begins to drool out, increase speed of screw to maximum.
  6. Minimize possible smoke and odor by purging in water.
  7. Continue adding purging compound until all polymer has been pushed out of the equipment.
  8. Clean out all purging compound from hopper. Run screw dry. Slow screw down.
  9. Clean end of screw and end of barrel.
  10. Remove screw from barrel. Screw can now be cleaned completely by wiping with conventional means without scrubbing.
  11. Make sure all material is out of the equipment before actual shut down.
  12. Reassemble extruder.

Suggestions for Purging Injection Machines

  1. Remove nozzle. Nozzle opening should be at least 3/16” or remove nozzle.
  2. Clean out all polymer from hopper.
  3. Keep cylinder temperature at normal setting for the polymer being purged. Nozzle temperature should be left somewhat higher to avoid resistance flow.
  4. Reduce injection pressure to a minimum and increase as required.
  5. Feed small amount of ULTIMAX PURGING COMPOUND into cylinder, allowing material to go through equipment by gravity feed. If it doesn’t feed smoothly, raise temperature in increments of 10 F until it does. Normally, no more than one cylinder full of purge material is sufficient to purge out old material and complete the cleaning process.
  6. Minimize possible smoke odor by purging into water.
  7. Continue adding purging compound until all polymer has been pushed out of the equipment.
  8. Clean out all purging compound from hopper.
  9. Now feed the next polymer. Set the temperature at normal for this molding powder.
  10. Cycle slowly for first shot of this polymer. Then cycle rapidly to eliminate purging compound completely from cylinder.
  11. Make sure all material is out of the equipment before actual shut down.

Note: Make sure workplace is well ventilated. Odors and fumes are not toxic or harmful even if unpleasant to some.
 

 
   

© 2003 Claude Bamberger Molding Compounds Corp.