Mixing machinery of the transfermix type
US5421650A · kind A · utility
Inventor
Key dates
| Filing date | Jun 8, 1993 |
| Grant date | Jun 6, 1995 |
| Priority date | — |
| Expiry date | Jun 8, 2013 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/08
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An apparatus for extruding material is provided which includes a barrel and a screw. The barrel has an axis and an internal operating surface, the internal operating surface defining a barrel interior and a barrel helical thread portion which includes a plurality of grooves reducing in cross-sectional area from a maximum value to a minimum value in a direction axially opposite to the axial direction of flow of material through the barrel. The screw has an external operating surface and extending into the barrel interior, the external operating surface of the screw forming a screw helical thread portion having at least a first and second groove. Each of the first and second grooves has an upstream end, a downstream end, and a body portion extending between the upstream and downstream ends thereof, the first and second grooves being axially co-incident at at least a transition location and being at least partially axially co-extensive. The internal operating surface of the barrel and the external operating surface of the screw together form a passage for the flow of material therethrough in which the material is transferred between the first and second grooves of the screw helical th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.