High speed plating of flat planar workpieces

Chemistry: electrical and wave energy – Apparatus – Electrolytic

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204224R, 204231, 204297W, 204DIG7, C25D 1708, C25D 1712, C25D 2110

Patent

active

043782817

ABSTRACT:
An overhead monorail transports racks, in which individual generally flat planar workpieces are suspended, along a path which may provide for several discrete processes in the production line of the circuit boards, and which path includes horizontal linear portion defined in a receptacle adapted to contain an electrolytic solution through which solution the racks and workpieces move between opposed insoluble electrode grills. A pressure manifold is provided at the bottom of the electroplating tank and upstanding nozzle defining towers are adapted to spray electrolyte from immediately behind the above mentioned insoluble electrode grills to continuously impinge upon the surfaces of the circuit board as the boards pass downstream through the tank. Metal to be plated is stored in receptacles behind the pressure manifold nozzle defining towers and the workpiece racks and anode baskets are coupled to a primary source of electrical power such as a rectifier. The workpiece racks and both of the insoluble anode grills are connected to a secondary or auxiliary power source to permit varying the outputs of both rectifiers independently of one another to achieve optimum current densities along the path of movement for these workpieces. An exhaust manifold is also provided along the marginal side edges of the receptacle or tank containing the electrolyte, being located behind the anode baskets containing the metal to be plated, to return electrolyte to a pump external to the tank for redelivery to the pressure manifold and to the above described nozzle defining towers.

REFERENCES:
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patent: 3511758 (1970-05-01), Bedi
patent: 3880725 (1975-04-01), Van Raalte
patent: 3939056 (1976-02-01), Fueki
patent: 3963588 (1976-06-01), Glenn
patent: 4029564 (1977-06-01), Higuchi et al.
patent: 4032414 (1977-06-01), Helder et al.
patent: 4033832 (1977-07-01), Sterling et al.
patent: 4045304 (1977-08-01), Tezuka
patent: 4053370 (1977-10-01), Yamashita et al.
patent: 4153523 (1979-05-01), Koontz et al.
patent: 4174261 (1979-11-01), Pellegrino
Eidschun, Continuous Processing for the 1980s, Oct. 1980.

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