Method and apparatus for removing resist particles from strippin

Liquid purification or separation – Structural installation – Closed circulating system

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Details

210767, 210784, 210805, 210196, 210405, 210456, 134 10, 134 42, 216 41, 216 93, B01D 2990, B01D 3372, C23F 100, H01L 213105

Patent

active

055318894

ABSTRACT:
A method for removing polymer particles from the stripping solution used in the treatment of printed wireboards comprises passing a solution having resist particles dispersed therein over a screen having openings of 100 microns, where the screen is maintained at an angle of from 40 to 70.degree. to the horizontal. The apparatus comprises a curtain tube consisting of an inner concentric tube with a plurality of holes and an outer concentric tube with a slot wherein the position of the slot is adjustable, filter means comprising a screen, and a pump for circulating the solution. In one embodiment, the filter means comprises a cylindrical screen.
The stripping solution comprises an aqueous solution of an organoamine, ionic nitrogen compound or alkali or alkaline-earth hydroxide, or mixtures thereof.

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