Method and solution for the prevention of smear in the manufactu

Details Method and solution for the prevention of smear in the manufactu Method and solution for the prevention of smear in the manufactu

1987-08-18

1990-04-03

Beck, Shrive

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

408704, 427 96, B05D 512

Patent

active

049139312

ABSTRACT:
A solution and a method of using it for preventing smear in the manufacture of printed circuit boards includes monoethanolamine combined with a fatty acid for neutralizing the active amine except in the presence of relatively high heat, and a surface tension reducing agent. The solution is applied to the printed circuit board as holes are being drilled. The friction of the drill bit on the printed circuit board generates heat which activates the amine allowing it to attack the inner glass epoxy walls of the printed circuit board and prevent smear.

REFERENCES:
patent: 3778180 (1973-12-01), Ostrom
patent: 4231692 (1980-11-01), Brabetz
patent: 4294729 (1981-10-01), Bakos
patent: 4425380 (1984-01-01), Nuzzi
patent: 4444802 (1984-04-01), Winters
patent: 4474619 (1984-10-01), Meyer
patent: 4519732 (1985-05-01), Sutcliffe
patent: 4790912 (1988-12-01), Holtzman
Clyde F. Coombs, Jr., "Printed Circuits Handbook" McGraw-Hill, pp. 22-8 through 22-13
Peter E. Kukanskis, "Improved Smear Removal" Circuit Manufacturing, Mar. 1983, pp. 73-74.
John Davey, "Plasma Desmearing" Finishing Industries, Aug. 1981, pp. 33-34.
"Sulfuric Acid Etchback Systems," John W. Burkitt, Printed Circuit Fabrication, Dec. 1980.
"A Scientific Approach to Etchback," D. R. Witherell, publication date unknown.
"Epoxy Smear Not Inevitable," Circuits Manufacturing, publication date unknown.

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