The Study of Solder Paste Printing Parameter Optimizing Control based on Lead-free Sourface Mount Technology

The production system of SMT mainly includes six steps which are stencil printing,component placement,reflow soldering,adhesive dispense,wave soldering and inspection.Stencil printing acts as the first important step in the production line.This text designs printing observation numeric experiment to identify the process-optimized parameters of screen printing and obtains that pressure establishment is 6 kg ~8kg and Print speed is 25 mm/s ~125mm/s with NP-04LP silk-screen press and the 0.127mm thick stainless steel template and Loctite the LF320 non-lead soldering paste.