Part of the holes of the screen printing plate can penetrate the ink and leak onto the printing material; the mesh of the rest of the printing plate is blocked and cannot pass through the ink, blanks are formed on the printing material, and the screen is used as the supporting body. Screen stretched on the frame, and then coated with sensitized film on the Internet, the formation of photosensitive film, and then the positive version of the bottom plate close on the printing plate exposure, after exposure. Developing, the part of the plate that does not need to pass the ink receives light to form a cured film, the mesh is sealed, the ink is impermeable to the printing, the mesh of the part that needs to pass the ink on the printing plate is not closed, and the ink is penetrated during printing. Black marks formed on the substrate. Silk screen ink is relatively thick, poor color performance, if you want to get better results, you can increase the number of mesh, at least more than 300 mesh / inch. There are generally no requirements for production, and quality can be met, unlike offset printing or embossing.
Screen printing features:
1. Not subject to the size and shape of the substrate. In general, printing can only be carried out on a flat surface. Silk screen printing can not only be printed on a flat surface, but can also be printed on shapes and concave and convex surfaces of special shapes. It can also print a variety of large-scale advertisement paintings, curtains, and curtains.
2. The layout is soft and small. Screen printing plate is soft and flexible, and the printing pressure is small, so not only can it be printed on soft substrates such as paper and textiles, but also can be easily damaged by pressing glass. Printing on ceramicware.
3. Thick ink layer coverage. Screen printing ink thickness up to 30 ~ 100μm, therefore, the hiding power of ink is particularly strong, can be pure white printing on black paper. The thickness of the screen printing ink is strong, and the three-dimensional printing image is strong, which is unmatched by other printing methods.
4. Suitable for all types of inks. The wide range of inks used in screen printing has exceeded the scope of the usual ink definition. Actually there are pastes, plastics, paints, adhesives, or solid powders. Therefore, screen printing inks are sometimes referred to as "printing materials."
5. Strong light resistance. The problem of ink classification in a broad sense should be classified according to the type of printing, namely, letterpress ink, lithographic ink, gravure ink, and filtered ink. However, such classification is too principled to express all realities. In recent years, due to the ever-increasing variety of inks, new designs have appeared continuously. There are limitations only because of the type.
In addition to classification by type, there are generally classified by dry type. Examples include oxidatively drying inks, osmotic drying inks, volatile drying inks, and freeze drying inks.
There are also classified by product use. Such as book inks, printing inks, glass inks, plastic inks and so on. Also classified by product characteristics. Such as security ink, bright ink, photosensitive ink, transparent ink, electrostatic ink and so on. He also often hears the name of alcohol (soluble) ink and water (soluble) ink, which is a way to reflect their characteristics.
First, Offset Ink: In the future, the demand in the market will increase steadily, and the increase will not be too big, which will increase by about 5% to 6%, and the proportion will be 40% to 45%, of which the offset inks The growth rate will be faster.
Second, letterpress ink: the overall ratio will decline, but the proportion of flexographic ink will continue to rise, which is also consistent with the United States and Japan and other developed countries.
Third, gravure ink: in a steady state, but the plastic ink in the printing and the table is an upward trend, far from the international trend is different, because far involved in environmental recovery and other issues.
Fourth, the mesh version of the ink: the increase in market sales, mainly the increase in the amount of metal, glass and plastic screen printing ink. Moreover, the screen printing equipment has broken the backward situation of the manual printing machine. In these areas, advanced screen printing equipment has been used to increase the screen ink usage.
5. Dedicated special inks: There will be more and more dosages, such as inks for printing inks, anti-counterfeit inks, pearlescent inks, signage inks, fluorescent inks, phosphorescent inks, etc., all of which will be used for increasing market demand.