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Dyna-Purge introduces compound for polypropylene color changes

News 27.07.2016

The Dyna-Purge Division of Shuman Plastics Inc. (Depew, NY) has introduced Dyna-Purge A for polypropylene (PP) color changes. The hybrid product combines key features of both mechanical and chemical purging systems, with advanced ingredients reaching all stagnation areas breaking down the color contamination. More efficient and thorough purging improves part quality while reducing injection machine downtime and scrap

According to Tim Cutler, Dyna-Purge Vice President, the company commissioned Penn State Erie, The Behrend College, of Erie, PA, to conduct an extensive independent study on Dyna-Purge A in March 2016 at the Burke Center – School of Engineering. The study compared commercial purging compounds and an in-house resin to Dyna-Purge A. In purging and post purge results, only hybrid Dyna-Purge A left the injection molding machine clean and free of contaminants, said the company.

“The independent study on Dyna-Purge A demonstrates that it is more effective than mechanical (abrasive) and chemical purging compounds and in-house resins for purging during PP color changes,” Cutler explained. “Dyna-Purge A saves time and money as it lowers purging costs and scrap rates.”

In testing, the purging process successfully transitioned from black to natural PP in only seven shots using Dyna-Purge A. The hybrid purging compound is engineered to exit the machine with the next production resin, leaving behind no residual purging compound. It is versatile for a variety of applications including hot runners, profiles, sheet and cast film, with no minimum clearances. Dyna-Purge A does not require soaking or temperature alterations, and will not produce noxious fumes and odors or leave behind residue, said the company’s information. Furthermore, the ingredients are safe and non-hazardous.

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