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Performance Tips

The Dyna-Purge family of products have been designed to meet your demanding conditions. However, there may be instances where process alterations may enhance the results. The following is a collection of comments we have received from devoted customers over the years that we feel offer processors potential benefits.

1. Increasing Back Pressure can improve purge results by adding force and agitation to the purge process. This is true of Dyna-Purge, because it is a mechanical purge, needing no chemical component to do its job. Be sure to use enough material to fill the barrel, so Dyna-Purge can scour and push through contamination, including carbon build-up caused by degradation, which leads to black specks. Increasing the back pressure between 50% and 100% will usually improve the purging experience. As with any purging application, extra caution should be taken not to exceed any of the manufacturer's operating requirements.
2. Increasing the Screw Speed by raising the RPMs will help Dyna-Purge flow downstream faster. This increases the level of agitation and allows for the Dyna-Purge to plasticize sooner. The combination of producing more thermal heat and agitation may enhance the purging process. Care should be taken not to increase the temperature of the resident resin to the degradation point.
3. Reducing the Screw Speed will allow the unique scrubbing granules in Dyna-Purge to maintain their rigidity longer and travel further downstream before completely softening. This procedure will allow for extra scrubbing, when contamination is downstream at the end of the barrel and screw.
4. Shutting off the machine between changeovers can allow for additional contamination to be removed from the barrel and screw. Leave one half to 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 for the next production run. When the temperature reaches the lowest level for Dyna-Purge, begin to rotate the screw slowly, being careful not to over-torque the machine. Introduce another scoop of Dyna-Purge to push out the remaining purge and then immediately use your next production resin. This purging procedure allows for the Dyna-Purge to bond with any residual contamination on the barrel and screw, so that, as temperatures are brought up, Dyna-Purge will pull it off the surface and remove it from the machine.

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