The basic principle of screen printing is that part of the hole of the screen printing plate can pass through the ink and be printed on the substrate; the mesh of the rest of the printing plate is blocked, and the ink cannot pass through, forming a blank on the substrate. The traditional plate making method is manual, and the photochemical plate making method is more commonly used in modern times. Screen printing is widely used in the electronics industry, ceramic decal industry, textile printing and dyeing industry. In recent years, screen printing has also been widely used in packaging and decoration, advertising, and signage. Screen printing has the following characteristics:
1. Not limited by the size and shape of the substrate. Generally, printing can only be carried out on a flat surface, and silk screen printing can not only print on a flat surface, but also print on a shape and a concave surface of a special shape, and can also print various super large advertisements, drapes, curtains.
2. The layout is soft and the printing pressure is small. The screen printing plate is soft and flexible, and the printing pressure is small, so it can be printed not only on soft substrates such as paper and textiles, but also on glass and ceramic vessels which are easily damaged by pressure.
3. The ink layer has a strong covering power. The thickness of the ink on the letterpress and flat prints is only a few microns, the gravure printing is only valid for 12-15 μm, and the ink thickness of the screen printing can reach 30-100 μm. Therefore, the hiding power of the ink is particularly strong, and it can be used on all black paper. Made in pure white. In addition, printing such as circuit boards and oil paintings can be performed using the characteristics of the ink layer thickness.
4. Suitable for all types of inks. Screen printing has the characteristics that it can be printed using any kind of paint, such as oil, water, synthetic resin, powder and the like. Screen printing inks are actually various coatings. Other printing requires that the pigments of various inks be finer in size, and screen printing can be used as long as inks and coatings that can pass through the mesh mesh fineness. Screen printing can not only print monochrome, but also color printing and screen printing for color printing.
The wide range of inks used in silk screen printing has exceeded the definition of conventional inks. In fact, there are pastes, plastics, paints, adhesives or solid powders. Therefore, screen printing inks are sometimes referred to as "printing materials".
5. Strong light resistance. Since screen printing can print a thick ink layer, various binders and various colorants can be used. Even if coarse particles of pigment can be used, it can be used to put light-resistant pigments and fluorescent pigments in a simple manner. Into the ink, so that the prints of the prints will remain luster free of temperature and sunlight, and even glow at night. The silk screen printing ink is easy to mix and match. Because silk screen products have strong light resistance, they can be used for advertising and signage outdoors.
6. Flexible printing methods. Screen printing, like flat, concave, and convex printing, can be industrially produced on a large scale. At the same time, it has the advantages of flat, concave and convex printing, which is incomparable in plate making, low in price, flexible in printing method, flexible in technology and easy to grasp in technology. Therefore, it has developed rapidly in recent years. It is not limited by the size of the enterprise. Large industrial mechanization can be produced, and township enterprises and individual handicrafts can also be produced.
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