apparatus for separating particles from a solution, in particular for regenerating solutions used for the washing of printed circuit panels

摘要

Apparatus is provided for treating articles A, such as printed circuit boards, by removing solid particles, such as polymer resists, by means of chemical action such as a stripping action, with the chemical action being provided by spraying a solution onto the articles. The removed particles are then separated from the solution so that the solution can be re-used. The separation apparatus used has one or more screens or filters 36,37 that are angularly disposed to allow solution to fall through the screen, and solution is provided in such a manner as to wash along or across the screen, to wash particles into a residence zone 40, from which they may be evacuated. The particles are preferably propelled from the residence zone on a periodic basis, for subsequent filtration, whereby the solution in which they are carried may likewise be returned for re-use. IMAGE