Feedscrew design improves performance of single-screw extruders

The newest addition to Davis-Standard’s DS-Blend feedscrew line features a patent-pending design that improves the performance of single-screw extruders by providing distributive and dissipative melt mixing.

Davis-Standard DS Blend feedscrew

A two-stage approach achieves outputs similar to single-stage barrier screws, but with a lower melt temperature and reduced energy requirements, said Davis-Standard (Pawcatuck, CT). It can be installed on new or existing single-screw Davis-Standard extruders as well as those made by other companies. Building feedscrews for extruders made by competitors has been a significant area of growth for the company, said Davis-Standard, as more and more customers realize the benefits of Davis-Standard feedscrew technology.

“This is one of our most versatile and energy-efficient feedscrews to date,” said John Christiano, Vice President of Technology, in a prepared statement. “Customers interested in seeing this design in operation are invited to visit our research and development facility in Pawcatuck. As with all of our feedscrew designs, we are focused on product line performance, improved outputs, material homogeneity and feedscrew longevity. We are also proud of the fact that we can build a feedscrew for any extruder brand,” said Christiano.

Davis-Standard DSB feedscrews are available in 3/4 to 12 in. (19 to 300 mm) diameters with varying length/diameter ratios. Each screw is engineered for specific polymers and processes; customization is available depending on end product. Davis-Standard feedscrews accommodate the full range of extrusion and converting applications, including blown film, blow molding, cast film, compounding, elastomer, extrusion coating, fiber, laboratory, pipe, profile and tubing, reclaim, sheet and specialty systems.

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