In life, the leaflets, books, magazines, etc. we see are all printed. However, there is also a lot of printing in packaging. The patterns and text on food bags and the text on packaging cartons are all inseparable from our printing. So what are our common printing methods? First of all, gravure printing. Gravure printing is printing where the layout is directly pressed on the substrate. In this way, the saturation of the printed items is relatively high and does not require many rollers. However, there are several types of gravure printing plates, one is manual engraving gravure, another is etching gravure, and the other is laser engraving etching. Among them, the element of gravure printing is the original manuscript. The relative requirements are relatively high and must be continuous tones. Nowadays, it is mainly used in the pharmaceutical industry, food packaging bags, etc. It has a wide range of substrates, including high-end tin foil packaging paper. Secondly, there is the more common lithographic printing. This is an indirect printing method. The ink on the printing plate is first transferred to the blanket, and then transferred from the blanket to the substrate. Here, the printing press needs to have water supply and ink supply devices. Due to the certain characteristics of the ink, when printing, it is necessary to protect the non-graphic and text parts first. The ink is printed on the graphic and text parts, and then transferred to the blanket and then passed through. The pressure between the blanket and the roller transfers the graphic portion to the substrate. The plate materials for lithographic printing are mainly zinc plates or aluminum plates. The plate making is relatively simple and the cost is relatively low. Mainly used in printing of books, magazines, leaflets, newspapers, etc. Letterpress printing is obviously the opposite of gravure printing. This is also the oldest printing method in our country. It also prints with relatively high color saturation, but the plate making work is cumbersome and the cost is relatively high. Mainly used for fine printing of books and periodicals. Screen printing, also known as stencil printing. Mainly when printing, the ink is transferred to the substrate through the holes through pressure. Its printing range is very wide, mainly used in paper printing, trademark printing, packaging printing, building materials printing, ceramics, etc. The four main printing methods are as mentioned above, letterpress printing, offset printing, gravure printing, and screen printing.