B - Operations – Transporting – 41 – F
Patent
B - Operations, Transporting
41
F
32/47, 117/64
B41F 15/00 (2006.01) B41F 15/08 (2006.01) B41M 1/12 (2006.01)
Patent
CA 1200442
Abstract of the Invention Silk-screening apparatus for applying a pattern on a substrate surface includes suction applying facilities for returning residual pattern forming medium back through a screen member to the upper surface thereof after a pattern has been applied. Means are provided for adjusting the magnitude of suction from a minimal value adjacent imperforate portions of the screen member to a substantially constant value adjacent perforated portions sufficient to draw the pattern-forming medium back to the upper surface. Means are provided for maintaining a substantially constant magnitude of suction as a suction applying member passes over perforated portions of the screen member having varying degrees of porosity.
416422
Borden Ladner Gervais Llp
Ppg Industries Ohio Inc.
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