| 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 extensive knowledge in all types of extrusion processes. | |
US patents in Extrusion | |
| Efficient Screw | * Patent #3650652 |
| "W" Mixer | * Patent #3788612 |
| Dray Mixer | * Patent#4444507 |
| Adjustable Dam | * Patent #4723847 |
| 'R" Mixer | * Patent #4842414 |
| Dray Concept | * Patent #4896969 |
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