Differences between the principles, surface characteristics, ink expressiveness and scope of use of the four major traditional printing

Brief printing process:

Layout - plate - fixing - on the machine - color - printing - cutting - gluing - binding

Printing principle:

Printing plate according to the printed part of the print and the non-printed part of the printing process, the principle of the print, can be divided into the physical printing

(Physical

) and chemical printing (ChemicalPrinting) two categories.

Printing) and chemical printing (ChemicalPrinting) two categories.

Physical printing, printing ink in the print part of the print is completely a pile of bearing, no print part of the low concave or raised, and the print part of the height of the print is different and can not be stained with the ink, let it be blank, so the print part of the print ink transfer in the printed material, is only a physical-mechanical role. In general, letterpress, intaglio, perforated printing, dry lithography, etc., are physical printing (the printing surface is higher or lower than the non-printing surface).

Chemical printing, the printing plate without printing part (non-printing surface) of the ink is not stained, not by the part of the low concave, raised, or blocked, but because of the chemical effect, so that it produces water-absorbent refusal of the ink film to make. Of course, the printed part (printing surface) ink absorption and water rejection, non-printed part of the water absorption and ink rejection, water and oil and grease each other reversal, is still a physical phenomenon, but in the printing process, we must continue to make the non-printed part of the complementary water absorption and ink rejection of the film, so it is a chemical printing. Lithographic rubber printing machine printing, that is, belongs to this kind. Cover the sink solution, must be added to the class and glue-like substances, so that the source of supply of carboxyl groups of the mucus layer, in order to maintain the non-printing part of the printing plate is not the face of the oil invasion