Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1990-03-09
1991-08-20
Derrington, James
Metal working
Method of mechanical manufacture
Assembling or joining
264 63, 264 56, B21D 3903
Patent
active
050402811
ABSTRACT:
A method for the preparation of apparatus for the application of foam flux in a system for soldering printed boards, comprising the steps of: providing a flux tank having means for maintaining a fixed level of flux liquid therein, providing a partition therein which possesses a top portion rising above the fixed level of flux liquid maintained therein and a bottom portion having perforations therein, said partition serving to divide the interior of said flux tank into an inner tank portion and an outer tank portion, providing a plurality of porous ceramic tubes formed by extrusion molding of an aggregate of uniform and fine ceramic-forming particles having an average particle diameter of 60 to 1000 mesh with the aid of an organic plasticizer and an inorganic binder and then calcining the molded tubes to form porous ceramic tubes possessing pore diameters in the range of 10 to 30 microns and a porosity in the range of 35 to 55%, and then providing said tubes inside said inner tank portion with one end thereof communicating with an external compressed air feed mechanism and the other end thereof closed, is disclosed.
REFERENCES:
patent: 2267877 (1941-12-01), Sebell
patent: 3135630 (1964-06-01), Bielinski
patent: 3218193 (1965-11-01), Isaacson
patent: 3724418 (1973-04-01), McLain
patent: 4684544 (1987-08-01), Arnett
patent: 4796558 (1989-01-01), Chartrand
Derrington James
Hueschen Gordon W.
Skiki Roll Kabushiki Kaisha
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