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

• 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。