The concept of printing mesh
1. Traditional printing mesh: Traditional printing mesh is an ancient printing method. The plate making method is manual, and the equipment used mainly includes a printing machine, a wire mesh, a wooden frame and the like. The basic principle of printing is that part of the hole of the screen printing plate can be printed on the substrate through the ink: the mesh of the rest of the printing plate is blocked, and the ink cannot pass through, forming a blank on the substrate.
2. Modern printing mesh: Photochemical plate making is more commonly used in modern plate making methods. The plate making method adopts a wire mesh as a support body, and the wire mesh is stretched on the net frame, and then the photosensitive adhesive is coated on the net to form a photosensitive plate film, and then the positive plate bottom plate is adhered to the plate to be printed on the plate. Exposure, development, the part of the printing plate that does not need to pass the ink is formed by the light to form a cured plate film, the mesh is sealed, the ink is not transparent during printing, and the mesh of the portion of the printing plate that needs to pass the ink is not closed, and the ink is transmitted through the printing. , forming ink on the substrate. When printing, the ink is poured into one end of the screen printing plate, and the ink does not leak through the mesh through the mesh without any external force. When the ink is scraped with a certain inclination angle and pressure, the ink is used. Transfer through the screen to the substrate under the screen to achieve image reproduction.
Hole printing, letterpress printing, gravure printing, lithography and modern four major printing. Screen printing is one of the main printing methods in stencil printing. Printing methods that are the same as stencil printing with screen printing include stencil printing, typing wax printing, stencil printing, and spray printing. There are many aliases for screen printing, such as silk lacquer printing, silk screen printing, stencil printing, stencil printing, screen printing and the like. Screen printing was originally made of silk as a mesh material, so in the early days of the world, screen printing was called Silk Screen Printing. This name is still used in the international online information retrieval catalogue, but in the publication of the book, after the net material was replaced by a large number of synthetic screens, Screen Printing was used instead.
The flat, concave, and convex printing methods are all printing methods in which the printing plate transfers ink to the substrate, and the screen printing is a printing method in which the ink is leaked onto the substrate through the mesh of the printing plate image. Therefore, there are more and more types of inks that can be used for screen printing. The substrates are not limited to paper. Others such as metal, plastic, and wood can be screen printed.
The printing principle is the same as screen printing. The difference is that the writing version does not use screen printing. Fabric printing is the same as screen printing. The image reproduction process is almost the same, except that the printing ink is used without printing ink.
3. The amount of ink on the screen: refers to the amount of ink passing through the screen (printing net) in actual printing. Subject to the material, performance, specifications of the screen, the viscosity of the ink, the pigment and other components, the type of substrate, the hardness, pressure, speed of the squeegee, and the gap between the plate and the substrate, etc. There is no established standard for the amount of ink. Generally speaking, a hypothetical transmission volume is called the amount of ink passing. The larger the mesh size of the printing net, the smaller the mesh and the poorer the ink passability; the smaller the mesh size, the larger the mesh and the better the ink passability. Therefore, when using the printing net, the screen of different meshes can be selected according to the precision requirements of the printing.