A new specialty “dual action” purging compound being highlighted by the Shuman Plastics’ Dyna-Purge Division is said to accelerate color changes for stack molds, high-cavitation molds, automated continuous molding environments and select extrusion applications, and further extends the company’s proprietary “3X technology.”

Dyna-Purge L is engineered for fast color or resin changes in demanding manufacturing environments best served through a lower viscosity product. This compound’s dynamic action is designed to work efficiently on the process boundary layers as well as expanding into negative flow and stagnation zones in the system. The L grade’s formulation is said to be safe and effective for removal of resin, color, carbon, additives and impurities without the introduction of abrasives or chemicals. The L grade’s “moldability” makes it essential for automated or closed environments.

The L grade was refined through rigorous field trials under actual processing conditions in order to earn commercial approval. This purging compound has been shown to be effective with all types of thermoplastics, and safely processed in the temperature range of 290°F-625°F (143°C-329°C). Like other Dyna-Purge products, L grade is also heat stable and suitable for shutdowns, startups, preventive maintenance and prior to manual cleaning.  The amount of purge typically required is one to two times barrel capacity, though the actual amount may vary dependent upon age and condition of process equipment. Sample quantities are available at no charge.

Says company president Ken Shuman, “This compound’s attributes were specifically requested by a number of our clients. They asked us to combine specific characteristics, distinct from our other high-performance products. Our client-centered focus put us on a path to engineer this unique compound and it’s quickly becoming one of our fastest growing products.”