Screw extruder for plastics
US4569595A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 1985 |
| Grant date | Feb 11, 1986 |
| Priority date | — |
| Expiry date | Jun 7, 2005 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/03
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The cylinder of the extruder comprises two parts separated by a heat-insulating gasket. In the wall of the upstream part there are ducts through which a cooling fluid flows. The inside surface of the upstream part is provided with parallel longitudinal grooves or spiralling grooves. The screw is divided into two zones, viz., a feed zone and a plasticizing zone which starts just after the heat-insulating gasket. The plasticizing zone includes an entry channel which gradually decreases in depth downstream and an exit channel which gradually increases in depth downstream. The mass of plastic material leaving the extruder is homogeneous and at a predetermined temperature with high output, as independently as possible of the material used.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.