Back pressure plate for cardboard box fabrication, has hard anodized surface layer having sufficient thickness and hardness, with grooves formed at predetermined portions of the plate

摘要

The back pressure plate (4), made from aluminum, has a hard anodized surface layer (10) having sufficient thickness and hardness, with grooves (9) formed at predetermined portions of the plate. Independent claims are also included for the following: (a) a technique for fabrication of a back pressure plate; (b) a printing machine; and (c) a technique for punching grooves on a substrate