Injection Blow Molding – Resin or Color Change: Suggested Purging Procedures

The following are suggested purging procedures for injection blow molding as it applies to resin or color change applications.

Changeover Procedure

  1. Maintain temperature and RPM settings for resident resin.
  2. Retract machine carriage from mold, leaving ample room for purge to exit nozzle.
  3. Disconnect or shut-off auxiliary feeding equipment and thoroughly clean the hopper.
  4. Empty barrel and starve the screw of the resident resin.
  5. Introduce Dyna-Purge (1 to 2 times barrel capacity) into empty hopper or side port. Note: actual amount needed depends on machine conditions.
  6. Set machine shot size between 50% and maximum allowable setting.
  7. Purge until the compound flushed out of the machine is clean and free of contamination.
  8. Thoroughly clean the hopper and adjust temperature settings for your next production resin.
  9. Using your next production resin, flush out the remaining Dyna-Purge.
  10. Thoroughly clean machine nozzle and sprue bushing to remove any contamination. Caution: wear the appropriate personal protective equipment.
  11. Move machine carriage forward to make contact with mold sprue bushing.
  12. Start production run.

Safety First

Before performing any procedure, it is the machine operator’s responsibility to be aware of their company’s safety policy, to wear the appropriate personal protective equipment, and to make sure that only authorized personnel are in the area.


Important! The information presented herein, while not guaranteed, was prepared by competent technical personnel and is true to the best of our knowledge. NO WARRANTY OR GUARANTY, EXPRESS OR IMPLIED, IS MADE REGARDING PERFORMANCE, SUITABILITY OR OTHERWISE. This information is not intended to be all-inclusive as to the manner and conditions of use, handling or storage. Other factors may involve other or additional safety or performance considerations. While our technical personnel can respond to questions regarding safe handling and use procedures, safe handling and use remains the responsibility of the customer. No suggestions for use are intended as, and nothing herein shall be construed as, a recommendation to infringe any existing patents or to violate any Federal, State or local laws.

Dyna-Purge Products

Learn more about
the products we offer.

Dyna-Purge in the News

Check out our most recent article
in Plastics Technology

Free Sample

Choose any product and have it
shipped today!