April 30, 2008 - Before using a new resin, Andrews says, manufacturers must test the material to obtain data on its characteristics that will help determine a successful, well controlled process for extruding it. If none of these provides consistent output, the company sometimes turns to an outside manufacturer to produce a new screw for the material. He is a senior process engineer at Teel Plastics Inc. (Baraboo, WI), which specializes in manufacturing close-tolerance plastic tubing.