Coating apparatus – With vacuum or fluid pressure chamber
Patent
1986-10-08
1988-12-20
McIntosh, John
Coating apparatus
With vacuum or fluid pressure chamber
118410, 118413, B05C 502
Patent
active
047918799
ABSTRACT:
A coater for coating a running paper or cardboard web comprises a coating chamber having one side open against the web and means for filling the coating chamber with pressurized coating substance. The coating chamber is limited in the longitudinal direction of the web by a web entrance wall, and opposite thereof, a back wall in the form of a doctor member for forming a coating layer on the web. The distance between the walls is so short that, at normal web running speed, the web moves from the web entrance wall to the back wall in a time of at the most 0.3 s, preferably at the most 0.03 s. Coating substance is supplied by means of positive pressure to the coating chamber at a position close to the web entrance wall. Close to the web entrance wall the flow of coating substance in the coating chamber is divided into two branches, of which a first branch follows the web in its running direction towards the back wall and a second branch, which is considerably greater than the first branch, flows out from the coating chamber through a slot between the web entrance wall and the web.
REFERENCES:
patent: 3348526 (1967-10-01), Neubauer
patent: 4250211 (1981-02-01), Damrau et al.
patent: 4369731 (1983-01-01), Damrau
patent: 4396648 (1983-08-01), Holt et al.
patent: 4398494 (1983-08-01), Alheid
patent: 4452833 (1984-06-01), Holt
Eklund Dan
Westergard Sivert
McIntosh John
Oy Wartsila Ab
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