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DS-Blend feedscrew.
DS-Blend feedscrew.

Davis-Standard recently introduced its award-winning feedscrew line, the DS-Blend. This patent-pending design improves the performance of a single screw extruder for demanding applications by providing distributive and disipative melt mixing.

The two-stage approach achieves outputs similar to those of a single-stage barrier screw, but with a lower melt temperature and reduced energy requirements. It can be installed on new or existing single screw Davis-Standard extruders as well as non Davis-Standard brands.

According to John Christiano, Vice President of Technology at Davis-Standard, “This is one of our most versatile and energy-efficient feedscrews to date. Customers interested in seeing this design in operation are invited to visit our research and development facility in Pawcatuck.” He added, “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.”

Feedscrews are available from 3/4 to 12 inches (19 to 300mm) in diameter with varying L/D’s. Each screw is engineered for specific polymers and processes with customization 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. Sales and service engineers work alongside customers to find the right solution based on manufacturing parameters. Testing and trials are available to fine-tune the process prior to purchase.

In addition to design, Davis-Standard’s feedscrew manufacturing process reflects quality from start to finish. Plasma arc welding stations provide wear-resistant materials such as Colmonoy 56 and 83.

Three state-of-the-art whirlers are used for screw cutting and milling for screws made of stainless steel, 4340 steel or Inconel materials. These machines produce screw surfaces at very tight tolerances. After screws are milled and polished, they are treated with chrome plating or other wear-resistant coatings based on application. Screws receive a final inspection and polish before shipment.

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