B - Operations – Transporting – 05 – D
Patent
B - Operations, Transporting
05
D
117/115
B05D 1/26 (2006.01) B05C 5/02 (2006.01) B05C 9/04 (2006.01)
Patent
CA 1054873
ABSTRACT OF THE DISCLOSURE Method and apparatus for substantially simultaneously coating both surfaces of a web of indeterminate length. The web is fed in an upward direction and passes between a pair of coating members. The coating ?mposition is dispensed from an elongated slot and each coating member arranged transverse to the direction of movement of the paper web. An excess amount of coating composition is dispensed so as to form a dam at the nip defined by the confronting surfaces of the web and the spreading surface or lip of each coating member to assure uniform coating of the surface. The hydraulic pressure provided by the liquid composition passing between the spreading surface of the coating member and the web contributes to the stability of the web and hence attenuates any fluttering of the web. The spreading surfaces of the coating members are arranged in a staggered position relative to the direction of movement of the web and preferably arranged to overlap one another so as to cause the path of the web in the region of the coating members to deviate from an imaginary straight line and hence to be pulled somewhat over each spreading surface which advantageously compensates for any irregulari- ties in the spreading surfaces. The orientation of the coating members and the dispensing outlets, as well as the rate at which coating composition is dispensed are all made independently adjustable to enhance regulation of the thickness and uniformity of the coating layers deposited upon the web.
219332
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