How to eliminate the situation of mistakenly printing solder paste in the SMT process flow?

Nowadays, electronic products are pursuing miniaturization, and the through-hole plug-in components used can no longer be reduced in size. Because the solder joints are too small, solder paste is often mistakenly printed. Today, let's talk about how toSMTRemove the misprinted solder paste during the process. Due to the small solder joints, solder paste misprinting often occurs. Now, let's talk about it with the solder paste manufacturerSMTThere is a misprint in the process flowSolder pasteSome problems on how to clear the situation.

inSMTIn the process flow, it is inevitable that some problems such as misprinting solder paste will occur. In cases like this, throughout the entire process, most people will involuntarily use a small scraper to remove the mistakenly printed solder pastepcbPeel off the board. Although this method seems simple and effective, it might not be appropriate. In fact, during the entire process of peeling off the solder paste, it is very likely to get scratched if one is not carefulpcbThe board is very likely to cause problems subsequently, leading to substandard products. Therefore, it is not recommended to use such a method for peeling. We can start with clear method to thoroughly after soaking, practical skills as follows:

The first step: Soaking

MisprintedpcbThe board was immersed in a compatible solvent for about ten minutes.

Step 2: Erase

Use a soft-bristled brush to slowly remove the mistakenly printed solder paste from the board. It should be noted that it is not recommended to use a hard-bristled brush, cloth strips or ordinary rags for wiping, as the hard-bristled brush may cause damagepcbBoards, cloth strips or rags are prone to contaminating other areas with solder paste.

Step 3: Cleaning

After normal use of a soft-bristled brush for disinfection and cleaning, there may still be a little solder paste remaining. The reason why it is still necessary to use board cleaning water for thorough cleaning is that we can also use an ultrasonic cleaner for this step, which is helpful for a very thorough cleaning.

Step 4: Dry with an air gun

Use an air gun to blow dry to prevent water droplets from remaining and affecting subsequent reprinting.

If we pay attention to the details, we can eliminate some problems. We are all willing to soak and disinfect frequently, spending a little more time, and will not do it by dry brushing or scraping to save money, so as to avoid the possibility of substandard products suddenly appearing later.