What to do When Experiencing Contamination in the Accumulator Head

By Tim Cutler

Related links: Purging

If experiencing contamination in the accumulator head, raising the temperature approximately 50˚F and then soaking with a commercial purging compounds, such as Dyna-Purge, will help remove the build-up. Follow the normal Dyna-Purge procedures for purging an extrusion blow molding machine and then fill the accumulator with Dyna-Purge. Purge a small amount of Dyna-Purge through the die, then soak for 30 minutes. If the accumulator has internal agitation, turn on periodically while soaking. When there are more than 2 heads, raise the temperature of the outboard heads 50˚F higher than the rest of the system. This will compensate for the longer flow path. Empty the accumulator, adjust temperature settings for your next resin and flush out Dyna-Purge. Remember to always work within the resident resin temperature profile to minimize possible degradation of the resin.