In printing technology, there are broad and narrow definitions of printing classification. The broad printing classification refers to traditional analog printing technology and digital printing. The narrow printing classification refers to gravure printing, letterpress printing drama, stencil printing under traditional analog classification Printing, lithography, etc.

1. Gravure printing
Gravure printing is a printing method that uses four editions of printing. For the products printed by the printing plate, the thick line ink layer is thick and protrudes, the glossy line is thin and as thin as hair, but it can still be clearly distinguished. It is characterized by clear lines, fine and beautiful, long-lasting color, and is not easy to imitate. It is mostly used for printing securities. The fourth edition of the photo is extremely expressive of dark tone levels, and is suitable for printing high-quality color magazines. It is suitable for printing and packaging plastic sea films because of the use of organic solvent ink that is easy to dry. The general gravure printing plate can print 500,000 prints. For example, if it is chrome plated on the four copper plates, the printing resistance can reach more than 5 million prints.

2. Letterpress printing
Letterpress printing is a printing method that uses letterpress printing. In relief printing, thicker oil can be attached due to the convexity of graphics and text. During printing, the ink is pressed into the pores of the paper through a large pressure (30KG / CM2), so the relief printing product has a clear outline and strong strokes 3. The bright ink color is suitable for printing mainly printed text.

3. stencil printing
The stencil printing is a printing method using stencil printing. In stencil printing, because the ink leaks through the holes of the text and reaches the substrate, the biggest feature is the thick ink layer, the graphics and text are uplifted, and the relief has a three-dimensional sense. Screen printing accounts for more than 98% of stencil printing, and has become a representative of stencil printing. Screen printing is suitable for printing trademarks, advertisements, book covers and glass, ceramics and other fragile curved surfaces.

4. Lithography
Lithography is a printing method that uses offset printing. Traditional lithography is based on the principle of oil-water repulsion, which imparts different physical and chemical properties to the graphic parts and blank parts that are basically on the same plane, making the graphic parts hydrophilic and oil-repellent. When printing, first apply water to the layout, and then apply ink, so that the image and text are inked and the image is transferred to the paper. Lithographic printing is easy to make plates, the plates are light, and the plate is fast. It can produce large-scale color prints with good quality and accurate overprinting, which is especially suitable for printing pictures and texts.

Among the above printing methods, the most used method of luminous powder is orifice printing (screen printing), and the particle size of the luminous powder is selected according to the size of the screen. The luminous powder is mixed into the transparent ink, and the printing can be performed by stirring evenly. Because the viscosity of the ink is very high, there is no need to consider the problem of luminous powder sedimentation.

Glowing water glass