Briefly on some of the solder paste printing process knowledge

The application of the solder paste printing machine is now more extensive in various industries. Do you have a knowledge of the use process of the solder paste printing machine? The Topco industry will share some process knowledge of the solder paste print. First, the SMT solder paste printing machine once time to the amount of the solder paste (the tumble diameter of the solder paste) 1, the tettle paste diameter ∮H≈10 to 15 mm is suitable. 2, the rolling diameter is too small to make the solder paste, and the amount of tin is small. 3, the diameter of the roll diameter is too large, too much solder paste is necessary to constitute the tin paste if the solder paste can not constitute the rolling movement, the solder paste cannot be scratched, and the printing is poor, the solder paste is thick, etc. Poor printing; too much solder paste is exposed to the air in the air for a long time. 4, at the production of the operator to see the amount of solder paste on the net plate every half hour, move the solder paste outside the sheet on the sheet on the sheet to the meter on the wiper stroke of the sheet and evenly distributed The solder paste, but it cannot be shoveled to the open hole of the steel network. The smaller the angle of the doctor blade and the wire board is smaller, the smaller the scraper and the steel network, the larger the down pressure, and the solder paste is injected into the mesh, but It is also simple to squeete to be squeezed to the bottom surface of the steel mesh and constitute a solder paste adhesion. Typically 45 ~ 60 °. At present, the automatic and semi-automatic printing machines are mostly 60 °. Third, the printed circuit board pattern is aligned with the printing machine camera to the optical positioning point (FIDucialmark point) on the working table, and then the substrate and the steel net X, Y, θ are precisely adjusted, so that the substrate The pad graphics is completely coincident with the steel web openings. Fourth, the pressure scraper pressure of the doctor blade is also an important element affecting the quality of printing. Scraper pressure practice refers to the depth of the doctor blade, too small, and the doctor blade does not stick the steel network appearance, which is equivalent to increasing the printing thickness. Other pressure excessively small residual steel outer layer of paste, constituting a simple print forming bonds (bridges) and other printing defects. FQJ, read full text

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