Coating apparatus – With vacuum or fluid pressure chamber
Patent
1993-08-19
1995-08-22
Warden, Robert J.
Coating apparatus
With vacuum or fluid pressure chamber
118209, 118239, 141 65, B05D 140
Patent
active
054436389
ABSTRACT:
A device for generating a subatmospheric pressure at a coating layer on a web-shaped carrier material which is guided over a coating roll. The device is provided with a pressure chamber which is pressurized symmetrically with compressed air via two end-face inflow openings. The compressed air is fed symmetrically to the inflow openings via a manifold unit. From the pressure chamber, the compressed air emerges via a so-called Laval nozzle, thereby generating in a region above the nozzle a subatmospheric pressure which acts on the meniscus of the coating layer during the transition from the gap of the coating die onto the carrier material. Movable seals are provided to permit the width of the nozzle to be adapted to the coating width of the carrier material.
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Gartmann Uwe
Hultzsch Guenter
Idstein Hermann
Bhat N.
Hoechst Aktiengesellschaft
Warden Robert J.
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