Shutting off the machine between a resin or color change may allow for additional contamination to be removed from the barrel and screw.
Leave a full barrel of Dyna-Purge in the machine, then turn the machine off and let it cool down. Once ambient temperature is reached, turn the machine on and raise the temperature to 50°F (28°C) above the minimum operating temperature of Dyna-Purge. When the desired temperature of Dyna-Purge has been reached, begin rotating the screw slowly to avoid too much torque. The purge may still be stiff, so do not rotate the screw at full RPM. Introduce another scoop of Dyna-Purge to push out the remaining purge and adjust temperature settings for your next production resin. Using your next production resin, flush out the remaining Dyna-Purge. This purging procedure allows for Dyna-Purge to bond with any residual contamination on the barrel and screw during cooling. As temperatures are brought up, Dyna-Purge will remove the contamination from the surface and machine.