Method of surface treating paper webs

Details Method of surface treating paper webs Method of surface treating paper webs

B - Operations, Transporting

05

C

117/1

B05C 11/10 (2006.01) B05C 5/02 (2006.01) B05C 9/06 (2006.01) B05C 11/02 (2006.01) B05D 1/26 (2006.01) B05D 1/34 (2006.01) B32B 29/06 (2006.01)

Patent

CA 1087931

Abstract of the Disclosure A method is provided for controlling the amount of active substance applied to the surface of a continuously-moving paper web, with the active sub- stance being dissolved in or dispersed in a treating liquid. The paper web is passed over a coating unit and includes an opening through which the treating liquid is applied to the paper web. The method includes the steps of supplying a first fluid with a predetermined amount of active substance to a first batch- ing device and supplying a second fluid consisting of pure solvent or dispers- ing agent to a second batching device. The output of the first batching de- vice is controlled in response to the speed of the paper web to control the amount of active substance supplied to a mixer, and the output of the second batching device is controlled in response to the fluid pressure at the opening of the coating unit to control the amount of solvent or dispersing agent sup- plied to the mixer. Then, the outputs of the first and second batching devices are mixed to form the treating liquid, which is then supplied to the opening of the coating unit so that the paper web is completely covered with treating liquid even in sections of the paper web where the surface roughness is rela- tively high, as compared to the remainder of the paper web.

284767

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