METHOD AND DEVICE FOR REMOVING SWELLABLE POLYMER PARTICLES FROM A LIQUID DISPERSION

摘要

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.