Excuse me, what is an electro-engraving plate? Does it have anything to do with film, ps version and print version? Why are electro-engraving plates cylindrical?

God, you are no ordinary layman. Film and ps plate, printing is a traditional process, and the effect is achieved through corrosion. Electric carving is a mechanical operation carving with better effect. How can you run fast if it is not cylindrical? Printed matter is also printed in rolls, then sealed and cut into shapes.