In purging injection molding machines or extruders, the way resin flows through the machine is an important factor. One resin replaces another from “the inside out.” In other words, the last of the resin being purged out will layer along the walls of the barrel and along the flights of the screw – especially the [...]
July 2012
Purge compound used by a company that makes plastic parts for shoes mainly with different PVC resin colors. The company sees an significant reduction in machine down-time (changeover time) and quantity of purging material consumed. Purging Application: PVC resin injected between 160 °C to 190° C. The color changes considered as the most complicated for [...]
As the regular use of an effective purge compound grows in the plastics industry, common misconceptions are being brought to light. In many cases, much to the surprise and delight of purchasing departments. One such misconception is that using resin to purge is more economical than using a commercial purging compound. In a recent example, a [...]
Most of us have experimented with or know someone that has with “Home Brew Purges” at one time or another. If we heard of a new one, we just had to try the new idea out. We would take that idea and maybe add to it with additional resin or regrind lying around. If you [...]
Under the guidance of Professor Milan Maric, Keith Oxby, a student at the Department of Chemical Engineering at McGill University, tested ASACLEAN E Grade and U Grade to clean a conical twin-screw extruder that operates in a co-rotating fashion. Test Steps: Keith found both E Grade and U Grade of ASACLEAN Purging Compound were equally [...]
“We were actually cleaning the barrel by hand and scraping the leftover polymer from the screws. We used ASACLEAN U and it did a really good job. The surfaces of the barrel and screw were free of all impurities after running a few cycles with ASACLEAN. The remnants of ASACLEAN on the screw did come [...]
Sun Plastech Inc. (Parsippany, NJ), maker of the leading purging compound, ASACLEAN, will be presenting a purging webinar “Purging Tips and Trouble Shooting Common Plastics Processing Issues” with Plastics Today (UBM Canon) from 2 pm (EST) on Tuesday, July 17th, 2012. The webinar goes beyond the “why’s” and “how’s” of using a commercial purging compound [...]
