Principles of screen printing

Stencil printing and letterpress printing, gravure printing, and lithographic printing are also called the four major modern printing techniques. Screen printing is a major printing method in stencil printing. The same printing methods as stencil printing with screen printing also include Yuji printing, stencil printing, hollow printing, and spray printing. There are many aliases for screen printing, such as silk paint printing, silk screen printing, silk screen printing, paste printing, screen printing and so on. Silk screen printing originally used silk as the net material, so in the early days of the world, silk screen printing was called Silk Screen Printing (silk screen printing). Today, this name is still used in the international online information retrieval catalog, but in books and publications, since the web material has been replaced by a large number of synthetic silk screens, Screen Printing has been used instead.

The three printing methods of flat, concave and convex are the printing methods in which the printing plate transfers the ink to the substrate, while the screen printing is a printing method in which the ink is missed on the substrate through the mesh of the printing plate image. . Therefore, more and more types of inks can be used for screen printing, and the substrate is not limited to paper, and metal, plastic, wood, etc. can be screen printed.

The principle of Yuyu plate printing is the same as that of screen printing, the difference is that Yuwen plate does not use silk screen as the plate. Fabric printing and dyeing use screen printing as the same as screen printing, and the image copying process is almost the same, except that printing and dyeing use printing paste instead of printing ink.

Screen printing is an ancient printing method. The basic principle of its printing is: part of the mesh of the screen printing plate can penetrate the ink and miss the printing on the substrate; the remaining mesh on the printing plate is blocked and cannot penetrate the ink, 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. In this plate-making method, the silk screen is used as a support, the silk screen is stretched on the screen frame, and then the photosensitive adhesive is coated on the net to form a photosensitive plate film, and then the positive picture base plate is closely adhered to the plate film and printed. Exposure and development, the part of the printing plate that does not require ink is exposed to light to form a cured plate film, the mesh is sealed, and the ink is not permeable during printing; the mesh of the part of the printing plate that is to be over ink is not closed, and the ink penetrates during printing , Ink is formed on the substrate, and the ink is poured at one end of the screen printing plate during printing. The ink will not leak on the substrate through the mesh hole without the action of external force. And when the pressure scrapes the ink, the ink is transferred to the substrate under the screen through the screen to realize the image copy.

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