Printing – Stenciling – Processes
Patent
1989-10-02
1990-09-04
Burr, Edgar S.
Printing
Stenciling
Processes
101127, 29840, 29829, B41M 112
Patent
active
049534602
ABSTRACT:
An improved stencil (10), for screen printing a material (22) onto a substrate (20), comprises a sheet (12) provided with a plurality of trapezoidal openings (14) arranged in alternating fashion such that the taper of each opening is opposite to the taper of the opening adjacent thereto. Providing the stencil with alternating trapezoidal openings (14) improves the resolution of the pattern of material (22) printed on the substrate when the material is deposited on the stencil and a squeegee blade (24) is displaced thereacross to force the material into the openings (14). The quality of the pattern of the material (22) printed on the substrate (20) can be further improved by providing a friction-reducing coating (34) on the sheet (12) to reduce the drag of the squeegee blade (24) as it travels thereacross.
REFERENCES:
patent: 3363552 (1968-01-01), Rarey
patent: 4872261 (1989-10-01), Sanyal et al.
D. S. Horne and A. Cundy, "Surface-Mount Solder Printing Guidelines", Electronic Packaging & Production, Feb. 1988, pp. 116-118.
S. K. Case and J. A. Thompson, "Intelligent Inspection Increases Yields in Solder Paste Printing", Surface Mount Technology, Jun. 1989, pp. 21-25.
Advertisement, DEK U.S.A., Printed Circuit Board Assembly, Jun. 1989, p. 17.
AT&T Bell Laboratories
Burr Edgar S.
Levy Robert B.
Yan Ren
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