A plate cylinder enables a printing plate to be attached thereto and is improved in strength. A plate cylinder is attached to a rotationally driven plate driving shaft, and is configured to mount a cylindrical printing plate attached thereon from a tip end side thereof. The plate cylinder is provided with a plate cylinder main body having a plate mounting surface to which the printing plate is attached. A flat portion is formed on a flat surface positioned further toward a radially inner side than the plate mounting surface. A plurality of hole portions is formed side by side in an axially separated state in the flat portion. A plurality of plate fixing members tightly fixes the printing plate to the plate mounting surface. The plate fixing members are fitted into the hole portions, and are provided to be movable in radially inward and outward directions of the plate cylinder.

An anilox roller for flexographic printing machines, which comprises a sleeve cylinder rotatably supported about its own axis by the fixed structure of a flexographic printing machine, and an anilox sleeve, which has a tubular body provided, on its outer side wall, with an anilox surface which can be axially fitted on and removed from the sleeve cylinder. Forced circulation of a temperature control fluid within the tubular body is further provided.

Provided is a method for manufacturing a sleeve printing plate capable of forming an image pattern which applies printing on an object to be printed by laser engraving without generating cracks and chippings in a printing plate made of a photosensitive resin. The method for manufacturing a sleeve printing plate by making a printing plate made of a photosensitive resin surround an outer peripheral surface of a circular cylindrical sleeve body and forming an image pattern on the printing plate by laser engraving includes the steps of: washing and cooling the printing plate with water; applying heating treatment to the printing plate at a predetermined temperature; and applying heat radiation treatment to the printing plate after the heating treatment.