Specific phenomenon: overprint is not accurate; cause: NATURE: in addition to machine reasons, secondary printing, different position phenomenon 1, blanket relaxation 2, blanket installation incorrect 3, cleaning agent not completely dry, blanket surface sticky 4, blanket warp and weft direction incorrect solution: Essence: multiple printing error < 0.101, tight blanket 2, blanket cut into a square, chuck parallel or punched correctly 3, proper use of cleaning agent, dry the surface 4, re-install blanket