Hand Printing using Nanocoated and other High End Stencil Materials
Published: |
May 29, 2019 |
Author: |
Bob Wettermann |
Abstract: |
There are times when a PCB prototype needs to be built quickly to test out a design. In such cases where it is known early on that there will be multiple iterations or that a "one and done" assembly will be made that there will be some SMT assemblers who choose to hand print solder paste onto the board using a "frameless" stencil. In such cases where hand printing is used, the consistency of the printing technique has typically been in question. Furthermore, the effectiveness of both the nanocoatings as well as the higher end stainless steel materials, which have been heretofore studied in controlled printing environments, will be evaluated for their impact on the hand printing process. The purpose of the study was to determine the effectiveness of select nanocoating materials as well as certain high end stainless steel stencil materials as they relate to the manual SMT printing process. A variety of nanocoatings were applied to SMT metal stencils and solder paste volume measurements were taken to compare the effectiveness.... |
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Hand Printing using Nanocoated and other High End Stencil Materials article has been viewed 1101 times
Peter James
May 31, 2019
What was the paste temperature for the various trials? 15 minutes seems a very short time for a jar of paste to reach ambient from 3 degrees before the first trial(s), and this would be critical to performance.