Davis-Standard is pleased to introduce the latest option in 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 dissipative 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. Building feedscrews for non-Davis-Standard extruders has been a significant area of growth for the company as more and more customers realize the benefits of Davis-Standard feedscrew technology.
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.”
Davis-Standard’s DSB® feedscrews are the industry standard for design excellence. 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.
For more information, visit our website: https://davis-standard.com/service-support/parts-and-upgrades.
For inquiries of our feedscrews for Davis-Standard or non-Davis-Standard extruders, please contact us.
Photo caption: DS-Blend Feedscrew.
Where would you place this two-stage feed section on the screw? What materials work best with it? What materials would have a problem processing with it?
Good afternoon Jeff:
Thanks for checking out our blog.
The DS Blend mixing section is designed to provide a balanced level of distributive and dispersive mixing for single-screw extrusion applications. A wire and cable applications where the technology has worked well is in zero halogen flame retardant applications. LSZH Low smoke, Zero Halogen materials. We have also seen an advantage in applications that require excellent color mixing at low temperatures.
We have several individual dsb1 screws applying LDPE to our paper board. Do you have a technical contact name and phone # that I can ask a few questions about the operation of these screws? Thanks.
Good morning Leslie: Thank you for your inquiry. I will check in with my team and have someone reach out to you asap.