OXIDATION METHOD AND APPARATUS FOR USE IN THE METHOD

• Main Authors: SEKIGUCHI HIROSHI, USUI KATSUMI, OKUBO MASAO
• Format: Patent
• Language: English
• Published: 30.11.2000
• Edition: 7
• Subjects: CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; PRINTED CIRCUITS

PROBLEM TO BE SOLVED: To obtain an oxidation method and apparatus for use in the method, whereby an oxidation process can be made without processing nonuniformity. SOLUTION: This oxidation method is characterized by dipping a printed wiring board in a treating tank 1 contg. an alkaline water soln. to oxidate its Cu surface, forcedly removing precipitates produced in this treatment, and returning the process liq. from which precipitates are filtered, to the treating tank 1, without contacting to the printed wiring board 10. The oxidation apparatus comprises a precipitating tank 6 disposed at the bottom of the treating tank 1, a pump 3 for draining a process liq. from the bottom of the tank 6, a filter 2 for filtering the process liq. drained by the pump 3 and a piping for returning the filtered process liq. to the treating tank 1, and a shield plate 4 is provided for guiding more process liq. to the tank 6 from the opening of the piping so as to return the filtered liq. to the treating tank 1.