Mechanical graining Mechanically roughening the surface of a metal sheet by means of abrasive powders, sand bursting, etc, for use as an offset plate.SeeGraining.

• 机械磨版用磨擦粉剂,喷沙等机械方法把金属片的表面造成粗糙,适合为柯式印刷。参阅磨版。