smt red adhesive is also called SMT adhesive, also known as SMT adhesive, SMT red adhesive, it is a red paste evenly distributed with hardener, pigment, solvent and other adhesives, mainly used to fix components on the printed board, generally by dispensing or steel screen printing method to distribute. After pasting the components, place them in the oven or reflow welding machine for heating and hardening. It is not the same as the so-called solder paste, once heated and hardened, reheated will not melt, that is to say, the thermal hardening process of the patch is irreversible. The use effect of SMT glue will vary depending on the heat curing conditions, the connected material, the equipment used, and the operating environment. When used, the patch adhesive should be selected according to the production process. The purpose of using patch adhesive
① Prevent components from falling off during wave soldering (wave soldering process)
② Prevent the other side of the components from falling off in the reflow welding (double-sided reflow welding process)
③ Prevent the displacement and standing of components (reflow welding process, pre-coating process)
④ Marking (wave soldering, reflow welding, pre-coating) ① When using wave soldering, the components are fixed on the printed board in order to prevent the components from falling off when the printed board passes through the solder groove. ② In the double-sided reflow welding process, in order to prevent the large devices on the soldered side from falling off due to heat melting of the solder, there should be SMT patch glue. ③ Used for reflow welding process and pre-coating process to prevent displacement and vertical pieces during mounting. ④ In addition, when the printed board and components are changed in batch, the patch adhesive is used as a mark.