The vast majority of books, magazines, albums and packaging boxes are offset products.
Offset printing is a kind of lithographic printing, very simple to say that offset printing is with the help of rubber (rubber blanket) will be printed on the printing plate to the substrate on the printing method, that is, there are three cylinders (plate, rubber blanket, embossing) lithographic printing method, in the south of our country this printing method is known as Offset printing.
Two, gravure
Plastic bag products are generally gravure printing.
Rotogravure printing ink color is full of three-dimensional sense, the graphics have a sense of convexity, and rich layers, clear lines, high quality printing plate life, suitable for large quantities of printing. Gravure printing can print very thin materials, such as plastic film.
The main drawbacks of gravure printing are: the complexity of pre-press plate making technology, long cycle, high cost of plate making; due to the use of volatile solvents, the workshop has a high content of harmful gases, which is more harmful to the health of the workers; gravure printing practitioners require a relatively high treatment.
Gravure printing plate complexity and high prices, ink pollution of the environment. These two aspects of the problem affects the development of gravure printing. In particular, a large number of large number of prints to reduce the short version at the same time require a large number of low-priced prints to increase, so that gravure printing continues to lose the market.
Three, flexo
The most common logistics packaging corrugated cardboard boxes are flexo products.
Flexographic printing is the evolution of letterpress printing, flexographic printing is a direct printing method, due to the use of flexible, raised image plate and called flexographic printing. In flexographic printing, the plate is glued to a plate cylinder, and the plate is inked by an engraved metal anilox roller.
Flexographic direct printing has the following characteristics:
(1) large format. The maximum width of wide-format flexographic printing machine can reach 2.5m~2.8m.
(2)Low price. Flexographic printing resistance is very high, can be reused; ink prices are also lower.
(3) Can be linked production, such as printing, slotting, creasing, stapling (sticky) boxes, bundling, etc. can be completed in one machine.
(4) The strength of the carton is reduced less. Since flexo printing is light pressure printing, it has little effect on the strength of corrugated cardboard.
(5)Printing accuracy is not high, conventional offset printing plus the number of mesh lines for the 175 lines / inch, and flexo carton conventional plus mesh line figures for 35 lines / inch ~ 65 lines / inch, belonging to the low-precision printing methods, the most suitable for the printing of text line scripts, four-color image printing quality in recent years, although there is an improvement, but there are still limitations.
Four, screen printing
Screen printing is the nearest printing method to our lives. Common local UV is screen printing, according to the thickness of the screen can form a pile of ink, there is a very good sense of three-dimensional; screen printing is also widely used in self-adhesive label printing.