Because the graphic part and the non-graphic part in lithography are on the same plane, in order to distinguish the graphic part and the non-graphic part of the printing plate with ink during printing, based on the principle of oil-water separation, the non-graphic part of the printing plate is first supplied with water by the water supply device of the printing plate, thus protecting the non-graphic part of the printing plate from being wetted by the ink.

Then, ink is supplied to the printing plate by the ink supply device of the printing section. Because the non-graphic part of the printing plate is protected by water, ink can only be supplied to the graphic part of the printing plate.

Finally, the ink on the printing plate is transferred to the milk skin, and then the ink on the milk skin is transferred to the substrate by the pressure between the cots and the impression cylinder, thus completing a printing. Therefore, lithography is an indirect printing method.

Transfer printing

Belonging to a special printing method. The pad printing technology is very simple. With a steel (or copper, thermoplastic) intaglio and an arc pad printing head made of silicone rubber, the ink on the intaglio is dipped on the surface of the pad printing head, and then pressed on the surface of the desired object to print characters and patterns.

Curved surface printing

Curved surface printing is to put the ink into an intaglio engraved with characters or patterns, then copy the characters or patterns onto the curved surface, then transfer the characters or patterns to the surface of the molded product by using the curved surface, and finally cure the ink by heat treatment or ultraviolet irradiation.

thermoprint

Lettering, commonly known as "bronzing", has a long history in China. Refers to the first or fourth cover of the hardcover book case and the back of the book with words and patterns made of colored tin foil, or with various titles or patterns of scraggy by hot pressing.

Water transfer printing technology

Water transfer printing technology is a kind of printing that uses water pressure to hydrolyze transfer paper/plastic film with color patterns.

The technological process includes making water transfer decal paper, soaking decal paper, pattern transfer, drying and finished product.