Die assembly and method for forming honeycomb filters
US7294301B2 · kind B2 · utility
1Cited by
13References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 14, 2005 |
| Grant date | Nov 13, 2007 |
| Priority date | — |
| Expiry date | Jun 14, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/60
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A method for forming honeycomb structures, such as wall-flow honeycomb filters, which utilizes extrusion of multiple material supplies at once. Such methods may be used to form intermittent plugs or other structures in the cell channels during the extrusion process, for example. A die assembly is provided which includes secondary feedholes machined in the pins for intermittently or periodically injecting secondary material (e.g., plug material) into the cell channels of the honeycomb structure while it is being extruded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.