Stencil manufacturing and printing process and apparatus

Details Stencil manufacturing and printing process and apparatus Stencil manufacturing and printing process and apparatus

1989-06-26

1991-09-24

Fisher, J. Reed

Printing

Stenciling

Stencils

1011284, 101129, B41F 1520, B41F 1534

Patent

active

050504983

ABSTRACT:
A stencil manufacturing and printing process reduces printed image distortion by matching screen deflection in the photostencil preparation phase with stencil deflection in the printing phase. The usual squeegee is replaced by atmospheric pressure and screen/stencil deflection is induced by producing a vacuum in a gasketed airtight chamber under the screen through a specially constructed air distribution frame. Compressed air can be introduced in the chamber through the same frame to rapidly release the stencil from the substrate when the printing is completed. A control unit incorporating a pressure sensor facilitates control of the printing process. Correlation of screen tension constant and frame off-contact distance with chamber pressure readings provides a precise measure of screen area of contact. The frame may have a 2-piece construction with the stencil/screen supported by a removable insert and the air distribution and pressure level sensing functions afforded by a master frame into which the insert fits.

REFERENCES:
patent: 2239619 (1941-04-01), Murgatroyd et al.
patent: 3150583 (1964-09-01), Reed, III et al.
patent: 3172358 (1965-03-01), Weiss
patent: 3221648 (1962-04-01), Weiss
patent: 3221649 (1969-12-01), Weiss
patent: 3372638 (1968-03-01), Tripp
patent: 3463587 (1969-08-01), Oltra et al.
patent: 3871293 (1975-03-01), Valiela
patent: 3964385 (1976-06-01), Knight
patent: 4083301 (1978-04-01), Black
patent: 4388862 (1983-06-01), Thomas, Jr.
patent: 4484813 (1984-11-01), Maher

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