custom design, service, repair for the plastics industry. extruder screws, injection screws, feed screws, extrusion feed screws, injection feed screws, plasticizing screws, screw design

Products & Services

• • Plastics
  • Extruder Screws
  • Injection Screws
  • Feed Screws
  • Extrusion Feed Screws
  • Injection Feed Screws
  • Plasticizing Screws
• • Screw Design Injection Molding
  • Extrusion
  • Process Evaluation
  • Screws
  • Screw Design
  • Valves

Web Result

Extrusion Technology

Extrusion Technology We are leaders in primary technology in all types of screw designs and most processes. R. Dray Mfg. is a progressive screw design company that incorporates time proven technology with industry advancing ideas to provide a successful solution for our customers. We have led the industry with new patent technology since our inception and are one of the few companies that have ext...

http://www.rdray.com/et.htm

Injection Molding Technology

Injection Molding Technology The processing of resins in injection molding and extrusion are similar but have obvious differences (reciprocation). R. Dray Mfg. is unique in being able to bring current extrusion screw design technology into injection molding. This ability coupled with the necessary molding experience allows us to give the injection customer the best process technology today. US pat...

http://www.rdray.com/imt.htm

Screw Design in Injection...

SCREW DESIGN IN INJECTION MOLDING Intent - The author in this paper is describing the observed differences between plastics processing in the Extrusion and Injection Molding Industries. These observations were made during thirty- seven years of plastics processing in the Extrusion Industry and eight in the Injection Molding Industry. Quality Control - Plastics processing requirements in Injection ...

http://www.rdray.com/scrdesgn.htm

Barrier Type Screw Designs

BARRIER TYPE SCREW DESIGNS Barrier type screw designs are the most widely used screw designs in the extrusion industry. The first barrier screw design was by Maillefer (Swiss patent # 82,535/59, filed 12/3/1959). The second and currently the most widely used barrier design is by R.F.Dray (Patent # 3,650,652, filed 5/5/1970). There are many different names for versions of this design by virtually a...

http://www.rdray.com/barrier.htm

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