VISCOSITY AND STENCIL PRINTING BEHAVIOR OF SURFACE MOUNT ADHESIVESAuthors: Neil Poole, Ph.D. and Brian J. Toleno, Ph.D.
Company: Henkel Loctite
Date Published: 12/3/2002 Conference: NEPCON West - Fiberoptic Expo
This investigation was divided into 3 distinct parts: Viscosity characterization, Print characteristics and Deposit analysis. The viscosity profile of each of the materials evaluated was measured in the laboratory to confirm that the material was within specification and to help identify key performance relationships. This data was used to determine the yield point values using the Casson model. Various print performance characteristics were observed during the stencil printing process.
Finally the resulting deposit profiles were measured using acoustic microscopy to determine how the print conditions affect the deposit profile. The correlations between yield point, clean print vs., flood print, and printing speed with respect to deposit height were determined.
Key words: SMA, surface mount adhesive, stencil printing, yield point.
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