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(609) 977-2011

  • Home
  • Upcoming Events
  • Contact Us
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Stencil Printing for Nerds

Basics of Solder Paste Printing

Learn how to get defects down and yields up...and have a nerdy laugh or two in the process  

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SMT007 Magazine May 2020

MTV Offers Solder Paste Testing Solution

Feature Interview of Chrys Shea by Nolan Johnson

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SMTAI 2019

Aperture Optimization and Paste Test


Written by: Chrys Shea, Jennifer Fijalkowski, Raymond Whittier, Michael Butler, Edward Nauss, and Dean Fiato

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SMTAI 2018

Accelerating the Solder Paste Selection Process

Written by: Chrys Shea

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SMTAI 2018

Stepped Stencil Study

Written by: Greg Smith, Chrys Shea, Michael Butler, and Edward Nauss

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APEX 2018

Henkel Test Kit 

Written by: Dixon Poole and Chrys Shea 

APEX 2018 Henkel Test Kit Paper and Presentation - Dixon Poole Shea (pdf)Download

Abstract                                                                                                                                                                       Consumer demand has accelerated the pace of the electronics miniaturization trend, compelling assemblers to develop robust capabilities for 01005 components and 0.3mm pitch array packages in order to remain competitive. The process of acquiring these capabilities can be complex, as they involve numerous interactive factors. To optimize the stencil printing and reflow portions of SMT assembly given the challenging new realities, a process evaluation tool has been developed that provides a

turnkey solution for solder paste performance testing. 


The evaluation toolkit incorporates PCB design with some embedded DOEs, a configurator that calculates sample sizes and bill of materials (BOM) costs, a stencil design, a fully integrated BOM for easy programming and feeder optimization, stepby-

step directions for solder paste performance testing, a soldering reference manual, basic statistical reduction of SPI readings, and a score card. The score card is a key element of the concept, as it enables the assembler to customize the selection criteria based on the specific operation.


This paper details the development of the turnkey test model, taking it from an internal test board to a publicly available, production-line ready kit. It discusses component selection, sample size considerations, cost reductions, maximizing test efficiency, and adding intelligence to the data. The overview examines both user and supplier perspectives on testing methods and highlights key  onsiderations for assemblers. It concludes with opportunities and plans for potential future developments to expand the tool’s analytical capabilities.

SMTAI 2017

Solder Paste Qualification

Written by: Chrys Shea

SMTAI 2017_Solder Paste Qualification (pdf)Download

Abstract

In the world of solder pastes, one size does not fit all, which is why so many different formulations exist. The myriad of options can be overwhelming, and matching the right product to the operation can be confusing, time consuming and costly. 


When a small EMS provider determined it was time to update the SMT process chemistry, they needed to develop a test program that they could execute efficiently while keeping production running and costs under control. The result is a consolidated test plan that gauges key solder paste properties and requires less than one shift of line time per product evaluated. 


This paper reviews the test plan, data collection and analysis processes, and presents the results. It discusses some of the issues encountered during test development and their resolutions or workarounds. Finally, it interprets the findings as they apply 

SMTAI 2014

Stencil Foil Alloy Evaluation

Written by: Chrys Shea and Raymond Whittier

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IPC Cleaning and Coating 2016

Effects of Coatings and Cleaning on Stencil Printing

Written by: Chrys Shea

File coming soon.

ICSR 2014

Stencil Nanocoating and UnderWiping

Written by: Chrys Shea, Mike Bixenman, Debbie Carboni, Brook Sandy-Smith, Greg Wade, RayWhittier, Joe Perault, and Eric Hanson

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SMTAI 2013

Stencil Experiments

Written by: Chrys Shea and Ray Whittier

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SMTAI 2011

Evaluation of Stencil Materials, Suppliers and Coatings

Written by: Chrys Shea and Ray Whittier

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