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SMT screen printing is science, not art

2013-09-29
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SMT Screen Printing is a Science SMT screen printing is a science, not an art | On a typical PCB (printed circuit board) || there may be hundreds of components and 600 to 1,000 connection points (i.e. pads). Therefore, the solder failure rate of these terminals must be kept to a minimum. Generally speaking, 60% of PCBs that fail testing and need to be reworked are caused by poor solder paste screen printing quality. This article will discuss the basic elements of screen || printing and explore the techniques required for continuous perfect screen printing quality in production. || There are three key elements in solder paste screen printing, here called the three S\'s: Solder paste, Stencils, and Squeegees. The correct combination of these three elements is the key to continuous screen printing quality || ||Solder paste (the first S) ||Solder paste is a combination of solder beads and rosin. The function of rosin is to remove oxides from component leads, pads and solder beads in the first stage of the reflowing oven, which lasts about three minutes at 150° ||C. (Resin is sometimes called rosin. Strictly speaking, resin is a natural product, while rosin is a man-made product.) Solder is an alloy of lead, tin and silver, which reflows at about 220° ||C in the second stage of the reflow oven. Both silver and rosin help melt the solder and wet it to achieve reflow...

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