Method for producing hollow extrusions
US6582643B1 · kind B1 · utility
5Cited by
9References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 5, 2000 |
| Grant date | Jun 24, 2003 |
| Priority date | — |
| Expiry date | May 5, 2020 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/60
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
Hollow extrusions are formed by initially extruding a plurality of separate strands adapted to form segments of the completed hollow extrusion in their positions corresponding to the locations of those segments in the finished extrusion. Webs between these strands are then formed by feeding an afterflow of the melt at press pressure into the shaping channel in the calibrator downstream from the die zone so that under the pressure of this melt and the melt heat, the webs fuse to the ends of ribs of the separate strands.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.