Loading patent…
AssigneeUnion Carbide Corporation
InventorsRobert W. Meyerhoff, Richard C. Hill
Estimating the term…
The invention is to friction rolls for working elongate members, e.g., webs or strands, such as crimper rolls, draw rolls, yarn package drive rolls comprising a roll having a generally cylindrical external surface and a ceramic, e.g., alumina, mixtures of alumina and titania, chromia, zirconia, or metallic carbide, e.g., tungsten carbide, coating bonded to the external surface, the coating being laser-engraved, that is, having a plurality of laser-formed depressions having a pattern covering substantially the entire exterior working surface of the roll and providing a uniform, wear-resistant surface texture over substantially the entire working surface.
A friction roll for performing work on an elongate solid material by frictional contact therewith comprising a roll having an external surface defining a working surface and a ceramic or metallic carbide coating bonded to said working surface, said coating having a plurality of laser-formed depressions having a pattern providing a substantially uniform, wear-resistant recast surface to said working surface, said recast surface providing a different morphological structure than the coating and providing a consistent coefficient of friction over a roughness range from about 20 to 1000 Ra, said coefficient of friction measured with a Shirley frictometer using a 150 denier nylon yarn at 10 grams tension and a surface speed of 260 yards per minute.
Method of forming a friction roll for performing work on an elongate solid material by frictional contact with said elongate solid material, said roll having an external surface defining a working surface comprising the steps of bonding a ceramic or metallic carbide coating to said working surface and laser-engraving the coating on said working surface with a plurality of depressions having a pattern covering substantially the entire said working surface and said laser-engraving step providing a uniform, wear-resistant surface texture of recast coating formed by said laser-engraving step over substantially the entire said working surface, said recast surface providing a different morphological structure than the coating and providing a consistent coefficient of friction as measured with a Shirley frictometer using a 150 denier nylon yarn at 10 grams tension and a surface speed of 260 yards per minute.
A device for performing work on an elongate solid material by frictional contact, the device including friction roll having a working surface, the device comprising, a ceramic or metallic carbide coating bonded to said working surface, said coating having a plurality of laser-formed depressions having a pattern providing a substantially uniform, wear-resistant recast surface to said working surface, said recast surface providing a different morphological structure than the coating and providing a consistent coefficient of friction over a roughness range from 20 to 1000 Ra, said coefficient of friction measured with a Shirley frictometer using a 150 denier nylon yarn at 10 grams tension and a surface speed of 260 yards per minute.
Dependencies are inferred from the claim text.