Ceramic honeycomb bodies, honeycomb extrusion dies, and methods of making ceramic honeycomb bodies
US11117083B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 24, 2016 |
| Grant date | Sep 14, 2021 |
| Priority date | — |
| Expiry date | Jan 5, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB01D46/2492
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
A method to form a laminar integral skin of a honeycomb structure is provided. The method includes extruding a ceramic precursor batch through a die with feedholes in entry side and slots in exit face of the die to form the honeycomb structure. In a region on the periphery of the die configured to form the cell matrix, a series of concentric slots around the matrix in the exit face of the die are configured to feed skin onto the matrix. Ring sections between concentric slots are angled away from the center and a mask is disposed on top of the periphery producing a channel for extruded skin to meet and bond to extruded matrix. Optionally, slots in the skin-forming ring sections enhance knitting between laminar skin layers. The die and honeycomb body having uniform integral skin are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.