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Solder resist has become an integral part of Printed Circuit Board (PCB) technology today. It is hard to find any PCBs that have no solder masks, although there may be some private individuals who have developed printed circuit boards without solder masks. Even PCBs ordered in very small quantities for prototyping have solder resist. Using solder resist on PCBs manufactured commercially is now the standard worldwide.
At the present time, Surface Mount Technology (SMT) has very fine pitch calculations, which sometimes do not work well with the conventional solder resist process. In these situations, Liquid Photo Imageable (LPI) solder resist is utilized. When first used, PCB solder resist was applied using a silkscreen and stencil printing. The newer LPI technique varies from the old stencil pencil technique quite a bit. In LPI, a very precise solder resist process is ensured by separating both imaging and coating into two different operations. PCB solder resist is actually a liquid photopolymer used by PCB manufacturer on bare PCB surfaces. Epoxy-acrylate or epoxy resin technology is used and the whole PCB surface is coated with it. In general, the material thickness is kept to 20 microns over copper tracks and 30 microns on the bare PCB surface. After applying the epoxy resin material to the PCB, it is dried and then exposed to the required image, which develops the desired solder resist pattern on the PCB. The PCB is then heat-cured, which makes sure that the solder resist has a firm and long lasting finish.
QISMT Electronic Co.,ltd provide a full SMT assembly line solutions, including SMT Reflow Oven, Wave Soldering Machine, Pick and Place Machine, Insert Plug-in machine, SMT Stencil Printer, SMT AOI SPI Machine, SMT Peripheral Equipment, SMT Production line, SMT Spare Parts etc any kind SMT machines you may need, please contact us for more information: wechat whatsapp:+8617748683433, Skype: qismteric, Email:sales@qismt.com
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