Robert F. Dray is the founder and owner of R. Dray Mfg. Inc., and the founder of Feed Screws Inc. in 1967. A screw of ?general-purpose? design is purported to have the ability to process a wide range ...

When Dave Larson, president of Westland Corp., which designs custom screws to meet specific job requirements, pictures the proper mixing of material by a screw, he always sees the same image.

Barr is credited with major advances in screw technology, large-part blow molding machines and extrusion. His barrier-type extruder screw, since the patent expired in the 1980s, is the most commonly ...

With the miniaturization of many products, manufacturers are streamlining devices to pack more features into smaller packages. For instance, the pitch (spacing) between contacts in electrical ...