Extrusion die for making flat products
US4772197A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 13, 1987 |
| Grant date | Sep 20, 1988 |
| Priority date | — |
| Expiry date | Mar 13, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29C48/695
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
An extrusion die has at least one distribution bore which communicates with a central bore which receives extruded material from an extruder. Each distribution bore extends perpendicularly with respect to the longitudinal central axis of the central bore and then terminates in a first chamber which has an substantially rectangular cross-section. Each first chamber receives the extruded material from its associated distribution bore and terminates in a counter-pressure distribution plate having a cross-section corresponding with that of the first chamber and having a plurality of bores uniformly distributed therein for forming extruded material from the first chamber into a plurality of strands which are received by a second chamber. Each second chamber has a substantially frustopyramidal profile wherein its cross-section tapers from a cross-section corresponding with that of the first chamber and counter-pressure distribution plate to a smaller substantially rectangular cross-section end for expanding and then for compressing and recombining the material of the strands. The end of each second chamber terminates in an extrusion slot which has a substantially rectangular cross-sectio…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.