Unengraved metering roll of porous ceramic
US4967663A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 24, 1988 |
| Grant date | Nov 6, 1990 |
| Priority date | — |
| Expiry date | Oct 24, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB41N2207/10
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
An unengraved metering roll made of porous ceramic material is described for depositing measured amounts of liquid as a coating on a substrate such as a metal can. The coating liquid is contained within the pores of the ceramic roll and deposited upon the object or a transfer roll without the use of metering cells which are ordinarily provided by engraving a pattern on the outer surface of the roll. The pores are of a substantially uniform size and are distributed substantially uniformly throughout the ceramic roll. The metering roll of porous ceramic material may be more easily resurfaced merely by grinding in a conventional manner to remove the original outer surface and replacing it with a new outer surface having pores which open to such outer surface for receipt of the coating liquid. The size of the pores and the amount of such pores in the ceramic body are controlled by mixing organic filler particles with the ceramic base material before firing so that such organic particles are burned out during heating of the molded roll body prior to sintering of the ceramic particles to form the porous ceramic roll. In this manner, the size and distribution of the particles can be contr…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.