The meaning of printing is also called the Special edition printing is an irregular name, he meant to set up a separate version of the printing, according to the printing plate and the relative location of the Non-verbal and text areas, the common printing methods can be divided into letterpress printing, intaglio printing, lithography and the printing of the four major categories:
(1) letterpress printing, printing version of the picture and text raised, obviously higher than the blank part, printing principle similar to the seal, the early woodblock printing, type printing and later the print printing, etc. are letterpress printing.
(2) gravure printing, printing plate part of the text is lower than the blank, often used in banknotes, stamps and other securities printing.
(3) lithographic printing, printed version of the text and the blank part is almost in the same plane, the use of oil-water phase dissolve the principle of printing.
(4) Hole version of the printing, printing version of the text part of the hole, ink through the hole to the substrate to transfer to the surface, the common hole plate printing has hollow version and screen version.