What are the printing methods for Shenzhen gift box printing?

Most books, periodicals, picture books and packaging color boxes are offset printing products.

Offset printing is a kind of lithography. Simply put, offset printing is a printing method that transfers the pictures and texts on the printing plate to the substrate with the help of blanket, that is, a three-roll lithography method (printing plate, blanket and impression), which is called offset printing in southern China.

Second, gravure printing.

Plastic bag products are generally gravure printed.

Gravure printing ink is full in color, strong in stereoscopic impression, convex in graphics and text, rich in layers, clear in lines, high in quality and long in service life, and suitable for batch printing. Gravure printing can print extremely thin materials, such as plastic films.

The main disadvantages of gravure printing are: complex prepress plate-making process, long cycle and high plate-making cost; Because of the use of volatile solvents, the content of harmful gases in the workshop is high, which is harmful to workers' health; Gravure printing practitioners have relatively high requirements for treatment.

Gravure printing plate making is complex, the cost is high, and ink pollutes the environment. These two problems have affected the development of gravure printing. In particular, the reduction of a large number of printed pieces and the increase of short-version low-priced printed pieces make gravure printing lose its market continuously.

Third, flexography.

The most common logistics packaging corrugated boxes are flexographic products.

Flexo printing is the evolution of letterpress printing and a direct printing method. It is called flexography because it uses elastic and convex image plates. The flexographic printing plate is glued to the printing plate cylinder, and the printing plate is supplied with ink through the engraved metal anilox roller.

Flexo direct printing has the following characteristics:

(1) large format. The maximum width of wide flexographic printing machine can reach 2.5m~2.8m

(2) low price. Flexographic printing has high printing resistance and can be reused; Ink prices are also very low.

(3) Production can be linked, such as printing, slotting, indentation, box binding (gluing) and binding.

(4) The strength of the carton is less reduced. Because flexography is light pressure printing, it has little effect on the strength of corrugated board.

(5) The printing accuracy is not high. The number of screening lines for conventional offset printing is 175 lines/inch, while the number of screening lines for flexographic printing cartons is 35 lines/inch to 65 lines/inch, which is a low-precision printing method and is most suitable for printing characters and line drafts. Although the printing quality of four-color images has improved in recent years, it is still limited.

Fourth, screen printing.

Screen printing is the closest printing method to our life. The common local UV is screen printing, which can form ink accumulation according to the thickness of the screen and has a very good three-dimensional effect; Screen printing is also widely used in self-adhesive label printing.