CHARACTERISTICS AND POTENTIALS OF NANO-COATED STENCILS FOR STENCIL PRINTING OPTIMIZATIONAuthors: Michael Rösch, Prof. Dr.-Ing. Jörg Franke; Carmina Läntzsch, Georg Kleemann
Company: Institute FAPS, University of Erlangen-Nuremberg; LaserJob GmbH
Date Published: 10/24/2010 Conference: SMTA International
The paper presents the new and innovative technology of nano-coated stencils. This includes the coating process and the coating material as well as the resulting stencil characteristics and the potentials of the nano-coated stencil for the printing process. The nano-coating is an innovative finishing technology to improve the stencil performance. The production takes place by a so called sol-gel process, a unique process with an economical possibility to realize a permanent and functional coating on the stencil surface. The nano-coating that covers the aperture walls and the stencil bottom side provides a hydrophobic characteristic with the consequence of a reduced adhesion between stencil surface and solder paste. The potentials of nano-coated stencils are illustrated on the basis of extensive printing experiments. On the one hand nano-coated stencils show less paste residues on the stencil bottom side with the consequence of significantly decreased stencil cleaning intervals. This leads to higher line efficiency and a reduced consumption of cleaning material. On the other hand the improved release behavior results in higher transfer efficiencies, especially for apertures with a critical area ratio. With regard to the stencil design, the area ratio of nano-coated stencils can be reduced down to a value of approximately 0.4. Both effects of nano-coated stencils contribute to a very robust and economical printing process.
Key words: Stencil Printing, Nano-Coated Stencil, Area Ratio, Transfer Efficiency.
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