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LeadFree Banner
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Stencil Printing
By Rich Heimsch


What are your views of the impact of lead-free adoption on the pre-placement process?

DEK has been studying the print process impact of lead-free implementation for a number of years now, and continues to conduct follow-up research in order to be able to provide a complete and interacting Pre-placement process.. optimized machine configurations, optimized operating parameters, and optimized stencil materials, manufacturing methodology and pattern design. We utilize pastes from a worldwide variety of sources and publish our findings on a continuous basis. We have definitely seen there to be differences in the imaging characteristics of lead-free materials and our ongoing process development research is focused upon further quantifying those differences and providing documented solutions for dealing with those differences.

For instance, a paper we published in 2002 that investigated mass imaging of lead free materials in enclosed print heads compared critical print characteristics of three lead free materials to those of a common lead rich material. It identified several significant differences, including a measurable and consistent difference in the release efficiency between the lead free and lead rich materials. Briefly summarized, the volume deposited for lead free was reduced on average by 15%. Since then numerous additional paste types have been compared and their characteristics quantified in a similar manner. Additionally, the data collection has been extended to measure the effect of various stencil technologies and imaging techniques, including our patented Vector Guard stencils, VAHT (Variable Aperture Height Technology) foils and ProFlow DirEKt Imaging. Details of these and other Applied Process Engineering studies are always available at www.dek.com

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Last Updated: August 30, 2004
Copyright © 2004
Publisher: Megan Wendling
Webmaster: David Haskell
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