Method and apparatus for coating a porous substratum

Details Method and apparatus for coating a porous substratum Method and apparatus for coating a porous substratum

1981-03-24

1982-12-14

Lusignan, Michael R.

Coating processes

Application to opposite sides of sheet, web, or strip

Roller applicator utilized

101119, 101120, 118123, 118124, 118406, 427358, 427359, 427365, 427428, 427356, B05D 312, B41L 1300, B05C 1102

Patent

active

043638333

ABSTRACT:
Coating a porous substratum with a viscous substance is performed by means of a rotatable cylindrical sieve (plain-mesh screen), comprising an internal squeegee for pressing said substance through the perforations of the screen. The substratum are passed in contact with the screen and is supported at the contact zone by a roller. Although the peripheral speeds of the screen and the substratum is substantially equal, the rotational speed of the support roller is such, that its peripheral speed is either smaller or greater than that of the substratum to an extent of at least 5%. This avoids the occurrence of the phenomenon of pinhole formation in the coated substratum.

REFERENCES:
patent: 1924994 (1933-08-01), Knapp
patent: 3152918 (1964-10-01), Kraus
patent: 3186681 (1965-06-01), Lowrey
patent: 3863597 (1975-02-01), Anselrode
patent: 3919973 (1975-11-01), Zimmer
patent: 4061109 (1977-12-01), Allen
patent: 4103615 (1978-08-01), Craz et al.

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