The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 06, 1990
Filed:
Oct. 24, 1988
Robert L Metcalf, Beaverton, OR (US);
Coors Porcelain Company, Golden, CO (US);
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 controlled to match the characteristics of the coating liquid for which the roll is to be used.