Blow Molding Purging Instructions | How to Use Asaclean®


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Asaclean® Mechanical Grade Purging Instructions for Extrusion Blow Molding

Extrusion Blow

  1. Raise the temperatures of the die 20°C – 30°C (35°F – 55°F).
  2. Extrude the remaining resin from the system.
  3. Clean the hopper and feed throat.
  4. For unfilled grades of Asaclean®, screens and dies may be left in place for purging. Consult your technical service representative for appropriate mesh size and die clearance.
  5. If the machine is heavily contaminated and glass-filled grades (EX, PX2, NF) are required, remove the screen pack to prevent plugging. Remove the die as well, if necessary (recommended for highly polished surfaces).
  6. Feed the required amount of Asaclean® into the hopper.
  7. Start purging at low screw speed first; increase the screw speed to the maximum safe level after material begins coming out from the head.
  8. Periodically stop the screw and allow the Asaclean® to sit for a few minutes. Resume screw rotation at maximum safe screw speed.
  9. When the purge is free of contamination, displace the remaining Asaclean® with the next processing resin, using the same procedure above.
  10. Change the machine parameters back to normal processing conditions.
  11. Replace screen pack with a clean one.

Accumulator Blow

  1. Raise the temperatures of the 20°C – 30°C (35°F – 55°F).
  2. Extrude the remaining resin from the system.
  3. Clean the hopper and feed throat.
  4. For unfilled grades of Asaclean®, screens and dies may be left in place for purging. Consult your technical service representative for appropriate mesh size and die clearance.
  5. If the machine is heavily contaminated and our glass-filled grades (EX, PX2, NF) are required, remove the screen pack to prevent plugging. Remove the die as well, if necessary (recommended for highly polished surfaces).
  6. Feed the required amount of Asaclean® into the hopper.
  7. Start purging at low screw speed first; increase the screw speed to the maximum safe level after material begins coming out from the head. If possible, bypass the accumulator to clean the screw and barrel first. If not possible, reduce the accumulator volume until the purge material from the screw appears free of contamination.
  8. Periodically stop the screw and allow the Asaclean® to sit for a few minutes. Resume screw rotation at maximum safe screw speed.
  9. If machine allows, increase back pressure to at least 80-90%.
  10. Fill the accumulator head, and increase the accumulator’s discharge speed to maximum safe level.
  11. Purge out 25% Asaclean® from accumulator then refill back to 100%.
  12. Purge out 50% Asaclean® from accumulator then refill back to 100%.
  13. Purge out 75% Asaclean® from accumulator then refill back to 100%.
  14. Purge out 100% Asaclean®.
  15. When the purge is free of contamination, displace the remaining Asaclean® with the next processing resin, using the same procedure above.
  16. Change the machine parameters back to normal processing conditions.
  17. Replace screen pack with a clean one.

Injection Blow Molding

Please follow purging procedures for injection molding.

Exercise proper safety precautions and use appropriate PPE.

Technical Questions?

To request detailed technical bulletins or technical support, contact us at Asahi Kasei Plastics North America Inc.

Phone: (800) 787-4348 / (973)257-1999
Fax: (973) 257-1011
Website: www.Asaclean.com
E-mail: sales@Asaclean.com

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