Screen-printed products have thick ink and bright colors, so they have always had an irreplaceable position in the printing industry. With technological upgrades in recent years, precision has improved and printing positions have become more accurate. We have added a large number of large-area screen printing machines, roll-to-roll fully automatic screen printing machines. It has laid a better and solid foundation for the quality of membrane switches, capacitive touch sensing switches, FPC flexible circuits and other products. But no matter how the technology is upgraded, its basic principles and operating methods remain the same, which can be roughly summarized as the following points:
1. Choose the mesh of the silk screen according to different materials.
Different printing products require different screens, such as synthetic fiber mesh, stainless steel mesh, natural fiber screen, etc. Various wire meshes are also divided into 50T, 100T, 120T, etc. due to different mesh aperture sizes. The larger the mesh number, the less the amount of ink that flows down, and the printed fonts are clearer. On the contrary, the smaller the mesh number, the more ink will be printed, and the printed color will be thicker.
2. Screen frame
Square screen frame, generally made of aluminum alloy, is similar to a square frame and is used to fix the wire mesh in the middle. The size of the screen frame is selected based on the size of the printed pattern. The larger the screen frame, the wider the printable area and the larger the size of the printed membrane switch panel.
3. Printing screen production
It is the process of fixing the mesh into the mesh frame. First, use equipment to flatten the mesh. It is required that the pulled out mesh has uniform tension and the warp and weft are vertical. Apply glue to the edge of the screen frame, and then fix the finished mesh into the screen frame. After the glue dries, the screen plate is ready.
4. Screen exposure
Use photosensitive paste to copy the film pattern onto the screen. First, apply photosensitive paste evenly on the stencil and let it dry. Then put the film and stencil into the exposure machine and expose it with a cold light source. The exposure time is determined by the size of the pattern.
5. Ink preparation
In general product design, not all colors have the corresponding original ink. The color needs to be adjusted according to the actual situation. The prepared ink is compared with the international Pantone color card under different light sources to confirm the color difference before printing to meet the customer's requirements.
6. Printing
Rechan Electronic Technology Co., Ltd. has multiple semi-automatic screen printing machines, large-area screen printing machines, and roll-to-roll fully automatic screen printing machines. Different printing machines are selected for production according to product size and order volume.
Rechan Electronic Technology Co., Ltd. is a manufacturer of capacitive and resistive touch sensing proximity switches. The company has advanced technical experience and a professional design team, as well as a high-quality and mature production workshop. Excellent performance in membrane switches, control panels, light touch switches, medical electrodes and other fields. Welcome to the factory to discuss customization. kevin@rechan.com
