In screen process printing, the patterns printed are elongated and deformed because the stencil was stretched to make it touch and lift from the substrate, with which it was kept off contact. The computer simulation showed the rate of elongation could be minimized by using “lift off” process, in which the stencil was lifted up synchronizing the movement of the squeegee to keep minimum contact angle of the stencil to the substrate. In actual printing process using “lift off”process, it was found that the deformation of patterns was rather enlarged when the initial gap between the stencil and the substrate was decreased to minimum, because the gauge was draged to the squeezing direction by friction between the stencil and the squeegee. This result sugests that the squeezing pressure to the substrate and the stretching force of the gauge are the most important factors to minimize the deformation of patterns duplicated by screen process printing.

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[in Japanese]

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[in Japanese]

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[in Japanese]

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