Stepped honed core mandrel

Details Stepped honed core mandrel Stepped honed core mandrel

1996-09-30

1997-12-16

Niebling, John

Electrolysis: processes, compositions used therein, and methods

Electroforming or composition therefor

205 70, 205 73, 205 77, 204281, 29 231, C25D 100

Patent

active

056980868

ABSTRACT:
An electroforming process and apparatus for forming an electroform with a roughened surface. The present invention roughens the surface of the mandrel using a sandblasting device in the center region of the mandrel allowing the two end regions to remain smooth. The intersection of the roughened center region and each of the two end regions form a step. This step on either side of the roughened center region facilitates sealing while the roughened center region enables toner distribution. The electroform created using the step roughened mandrel surface is separated from the mandrel without destroying the mandrel. The step roughened mandrel can then be reused to create another electroform with a roughened surface.

REFERENCES:
patent: 2569367 (1951-09-01), Bradner
patent: 3545996 (1970-12-01), Duncan
patent: 4565607 (1986-01-01), Hanak
patent: 4937030 (1990-06-01), Nishiyama et al.
patent: 5044123 (1991-09-01), Hoffman
patent: 5069758 (1991-12-01), Herbert
patent: 5131893 (1992-07-01), Herbert
patent: 5196106 (1993-03-01), DuPree et al.
patent: 5451311 (1995-09-01), Swain

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