New Injection Screw Is Said to Be Truly ‘All-Purpose’
A mixing section with removable dams can adjust melting capability to the viscosity of the material.
Robert Dray, a well-known screw designer and builder, has long held that there’s no such thing as a “general-purpose” injection molding screw—calling it rather a “no-purpose” screw because, in his view, it can’t do an adequate job of plasticating any polymer. Now Dray is offering a screw design that he says can properly process a wide range of polymers. His firm, R. Dray Mfg., Hamilton, Tex., is offering the APS, or “All Purpose Screw” (patent pending). The key to this screw is a mixing section with one or more removable dams that can be interchanged to alter the balance of distributive and dispersive mixing, depending on the viscosity of the material. The dams are keys inserted into slots and held by cap screws. This development also is suited to extrusion applications where a variety of resins are processed, according to Dray. (More details on the APS next month.)
Related Content
-
How to Design Three-Plate Molds, Part 1
There are many things to consider, and paying attention to the details can help avoid machine downtime and higher maintenance costs, and keep the customer happy.
-
Three Key Decisions for an Optimal Ejection System
When determining the best ejection option for a tool, molders must consider the ejector’s surface area, location and style.
-
Know Your Options in Injection Machine Nozzles
Improvements in nozzle design in recent years overcome some of the limitations of previous filter, mixing, and shut-off nozzles.
