Blow Molding Purging Compound Grades:
The ASACLEAN™ purging compound grade for your blow molding process depends on your thermoplastic resin(s) and plastics processing temperature. Contact a technical representative for proper grade selection for use in blow molding.
Increase push-out speed from accumulator to “maximum safe level”.
In order to increase pressure within the accumulator, reduce the die gap to the smallest clearance that will allow the respective ASACLEAN Grade to pass through. Consult a technical representative for ASACLEAN clearance requirements.
Raise temperatures by 68°F – 86°F (20°C – 30°C) for the entire system.
Start at slow screw speed first, and then raise the screw speed after ASACLEAN starts coming out of the machine.
Increase back pressure to at least 80-90%.
Fill the accumulator head.
Purge out 25% ASACLEAN from accumulator then refill back to 100%.
Purge out 50% ASACLEAN from accumulator then refill back to 100%.
Purge out 75% ASACLEAN from accumulator then refill back to 100%.
Purge out 100% ASACLEAN.
Displace the ASACLEAN with the next processing run, using the same procedure above.
Change the machine parameters back to normal processing conditions.