Abstract: Apparatus for exposing a series of plates to radiation. A stack of plates 53 to be processed are placed on the surface of a first table 7 located adjacent to a second table 8. Radiation exposure means 31 above both tables are switched on and after a time equal to half the required exposure time for a single plate a carriage 45 moves to slide the top plate of the stack from the first table 7 to the second table 8, deflecting a switch operating member 52 against a biasing force. This member operates a switch causing a motor 27 through suitable transmission systems to raise the first table 7 and lower the second table 8 by equal distances until the switch operating member 52 returns to its original position under the biasing force.

Abstract: Apparatus for simultaneously treating the surfaces of a plurality of exposed photopolymer printing plates supported one above another by racks on a trolley. The trolley may be moved by a conveyor 18 from a first compartment 6 to a second compartment 7 separated by a curtain door 11. The first compartment has a series of ultra-violet sources 26 interdigitating with the plates to expose these and a hot air supply 34, 35 for driving solvent from the plates. The second compartment has spray means 29 interdigitating with the plates to spray detackifying solution thereon and a hot air supply 34, 35 for drying the plates after detackifying.

Abstract: Apparatus for treating the surfaces of cylindrical objects in a number of sequential steps and, more particularly, for treating photopolymer printing cylinders in alignment with separate treatment bays. The cylinders are individually rotated in each compartment about their individual axes.