Printing – Stenciling – Traveling-inker machines
Patent
1986-12-31
1989-04-04
Crowder, Clifford D.
Printing
Stenciling
Traveling-inker machines
101129, B41F 1508
Patent
active
048175242
ABSTRACT:
A screen printing method and apparatus in which the ink pressure is held constant by varying the squeegee speed and/or the squeegee angle during a print stroke. In one method, the squeegee velocity v and/or squeegee angle .alpha. are controlled such that v times the square root of the amount of ink A on the screen before the squeegee, divided by the square of the sine of .alpha., is substantially constant. In another approach, the pressure is directly measured and held constant during the print stroke. The quantity A may be determined as a linear function of the squeegee position during the print stroke. A screen printing apparatus is provided having a squeegee with a planar surface and a contact edge at the lower edge of the planar surface. The squeegee is mounted such that it can be rotated about the contact edge, to thereby vary the squeegee angle without changing the elevation of the contact edge.
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Crowder Clifford D.
The Boeing Company
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