A method of processing perforated gypsum boards is disclosed. When the
gypsum boards have been perforated the following steps are performed while
the boards are being moved individually along a path. The moving boards
are sprayed with pressurized water which is directed towards the opposite
surfaces of the boards so as to enter apertures or slots formed by the
perforation of the boards, and then water is removed from the moving
boards by blowing pressurized air against the boards and sucking water
therefrom, wherein dust on the boards is entrained into the water and
removed from the boards together with the water.
