Method and device for removing swellable polymer particles...

B - Operations – Transporting – 01 – D

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B01D 35/28 (2006.01) B01D 29/01 (2006.01) B01D 29/90 (2006.01) B01D 33/073 (2006.01) B01D 36/02 (2006.01) G03F 7/42 (2006.01)

Patent

CA 2185009

The invention relates to a method for removing swellable polymer particles from a solution used to remove coatings of resists from printed circuit boards. The dispersion resulting during coating removal, containing fine resist particles, is passed over a screen in order to separate the particles. For this purpose the dispersion is firstly passed through a homogenising and distributing device, in which the dispersion is thoroughly mixed and then very uniformly applied on to the screen. The homogenising and distributing device comprises an inner tube with a plurality of holes and an outer tube with a slot. Furthermore, the device comprises means for circulating the coating removal solution and the dispersion.

L'invention a pour objet un procédé permettant d'éliminer des particules polymériques expansibles d'une solution servant à enlever les couches de résist de circuits imprimés. Afin de séparer les fines particules de résist présentes dans la dispersion obtenue lors de l'enlèvement des couches, on fait passer cette dispersion sur un tamis. A cet effet, on achemine tout d'abord la dispersion vers une unité d'homogénéisation et d'étalement (101) dans laquelle la dispersion est soigneusement mélangée puis appliquée de façon très homogène sur le tamis (121). L'unité d'homogénéisation et d'étalement comprend un tube intérieur (103) pourvu d'une pluralité d'orifices (107) et un tube extérieur (105) pourvu d'une fente (109). Le dispositif comprend en outre des organes (135) permettant de faire circuler la solution d'enlèvement des couches et la dispersion.

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