In offset printing heat transfer printing production, the ink on the previous sheet is not dry, and the ink on the previous sheet is overlapped on it, and the ink on the previous sheet is likely to be partially transferred to the back of the later sheet, known as the back rub. On the back of the dirt and through printing are shown to have dirty marks on the back of the sheet, but their formation mechanism is completely different. The back dirt is easy to occur in the printing of paint paper, ink layer, overprint color number, no dirty marks in the middle of the paper; Through printing tends to occur in the printing of non-coated paper, first color printing and ink directly on the back of the white paper, rather than the back of multi-color ink overprint, there are dirty marks in the middle of the paper, can not be erased.
There are two important stages of printing on the back of the dirt: one is the ink fixed stage of the back dirt, refers to the printing process of paper just transferred to the paper pile, there are 3-5 pieces of accumulation sticky dirty; Two is the ink curing stage of the back rub dirty, refers to the ink has been fixed but before curing, still stay in the softening stage, produce the back sticky dirty.
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Including: offset printing sublimation ink, screen printing sublimation ink, gravure sublimation ink, sublimation thermal transfer ink. Looking forward to your call!
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