The types of printing can be roughly divided into relief printing, lithography, gravure printing and stencil printing (screen printing).

Lithography:

This is the most common and widely used printing method at present. Image and non-image are on the same plane. Based on the principle that water and ink repel each other, the graphic part accepts ink but not water, and the non-graphic part is the opposite. In the printing process, indirect method is adopted. First, the image is printed on the rubber drum, and the image and text are changed from positive to negative, and then the image and text on the rubber drum are transferred to paper. This printing method can be used for picture books, picture advertising samples, calendars, etc.

Letterpress printing:

Letterpress printing has the longest history and is the most popular. The protruding parts of layout images and characters accept ink, while the recessed parts do not accept ink. When the printing plate is pressed against the paper, the ink will be printed on the paper. Printing materials mainly include movable type, lead plate, zinc plate, copper plate and photosensitive resin plate. Some books, bills, envelopes, business cards, etc. Still printed in relief; Relief printing is generally used for special processing, such as hot stamping, hot silver stamping, embossing and so on.

Gravure printing:

Gravure printing is the opposite of relief printing. Words and images are concave, and under the layout, the concave parts are inked. The depth of printing is related to the depth of indentation, deep is dry and shallow is light. Because gravure printing ink is different, the printed lines have a protruding feeling. Coins, stamps, securities, etc. It was printed in intaglio. Gravure printing is also suitable for printing plastic films and silk. Because gravure printing takes a long time, the process is complex and the cost is high.

Template printing:

It is also called screen printing. If you saw a teacher carve wax paper in primary school, you will understand this printing method better. Use silk, metal and synthetic screen, wax paper, etc. As a printing plate, the graphic part is hollowed out into fine holes, the non-graphic part is protected by printing materials, the printing plate is close to the substrate, and the ink is infiltrated into the substrate with a scraper or an ink roller. Screen printing can be printed not only on flat substrates, but also on curved substrates, with bright colors and durability. Suitable for printing labels, bags, T-shirts, plastic products, glass, metal utensils and other objects.