Abstract: A flat plate wash out machine especially suitable for joint brushing and solvent action on photopolymer printing plates in which brushing fingers are held by a pliable sheet with distributed pressure means behind the pliable sheet and the solvent is held in a container so that any photopolymer plates can be held substantially vertical during any wash out procedure. Mechanical agitation is achieved by a simple to and fro action of a pneumatic ram and two containers with perhaps differing solvents can be used at the same time with the same pneumatic ram driving.

Abstract: Apparatus for the washing out of an unpolymerized portion of a photo polymer printing plate using a selective solvent and brushes, the drive effecting the scrubbing action being either hydraulic or pneumatic and preferably coupling either the brush means or the photo polymer printing plate holding means by means of synchronously driven cranks.