Method for printing indicia on porous sheets

Details Method for printing indicia on porous sheets Method for printing indicia on porous sheets

1983-03-17

1985-10-15

Lawrence, Evan K.

Coating processes

Nonuniform coating

Mask or stencil utilized

248362, 427296, 427350, B05D 500, B05D 132, B05D 312

Patent

active

045474060

ABSTRACT:
A method and apparatus for printing indicia on a porous sheet including an enclosure in which a negative static pressure is produced to cause air flow through a perforated work surface of the enclosure. The porous sheet to be printed and an overlying stencil sheet are arranged and held firmly on the perforated work surface by the negative static pressure in the enclosure. In one embodiment, all but selected areas of the perforated work surface, the porous sheet and the stencil sheet are masked to block air flow through the masked areas and concentratingly direct the air flow through the selected areas. A liquid printing medium is sprayed so that it is carried by the inflowing air onto the areas of the porous sheet which are exposed by the stencial sheet cutouts.

REFERENCES:
patent: 2446010 (1948-07-01), Jahn
patent: 3126192 (1964-03-01), Stein
patent: 3292532 (1966-12-01), Berk et al.
patent: 4312694 (1982-01-01), Sherman et al.

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