Coating processes – Nonuniform coating – Mask or stencil utilized
Patent
1989-10-18
1992-03-10
Lawrence, Evan
Coating processes
Nonuniform coating
Mask or stencil utilized
427288, 427296, 427350, 118 50, 118406, 118410, 118415, B05D 500, B05D 132, B05D 312, B05C 320
Patent
active
050948865
ABSTRACT:
An apparatus for impregnating the surface of a web with a liquid in the form of a pattern, comprising a vacuum chamber having a suction wall with one or more openings therein; means for pulling and controlling a vacuum on said vacuum chamber; an impregnating chamber adapted to hold the liquid impregnant, said chamber having an exit wall with one or more openings therein, the exit wall being a substantially copolanar extension of the suction wall of the vacuum chamber; a pattern belt having an inner surface and an outer surface and perforations in the configuration of the desired pattern, said belt being mounted over the outside of said vacuum and impregnating chambers and being substantially unperforated except in the area of said pattern; means for moving the pattern belt past first the suction wall of the vacuum chamber and then the exit wall of the impregnating chamber, with the inner surface of the belt being in sealing engagement with the outside surfaces of both said walls; means for pressing the fibrous web to be treated against the outer surface of said pattern belt; and means for conveying said web past said suction and exit walls in synchrony with said pattern belt.
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patent: 4702943 (1987-10-01), Long
patent: 4740391 (1988-04-01), Long
Lawrence Evan
NPD Corporation
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