Method and apparatus for coating running webs

Details Method and apparatus for coating running webs Method and apparatus for coating running webs

1987-04-07

1989-11-14

Beck, Shrive

Coating processes

With post-treatment of coating or coating material

Solid treating member or material contacts coating

118407, 118410, 118413, B05D 312, B05C 312

Patent

active

048806714

ABSTRACT:
A coating apparatus, for applying a coating substance to a paper web, has a chamber from which the coating substance is supplied via a slit type mouth communicating with an applicator space which is defined by the paper web and a doctor blade element. At the web, on the side of the applicator space from where the paper web enters, a throttling passage is formed by a back-pressure element in such a manner that a stream of excess coating substance issues from the applicator space via the throttling passage and abruptly separates from the web and in so doing flows away from the web predominantly as a film thereby preventing completely or almost completely the admission of air into the applicator space by the air boundary layer adjacent the moving web.

REFERENCES:
patent: 3079889 (1963-03-01), Jacobs et al.
patent: 3518964 (1970-07-01), Nagler
patent: 4250211 (1981-02-01), Damrau et al.
patent: 4452833 (1984-06-01), Holt
patent: 4503804 (1985-03-01), Damrau
patent: 4679524 (1987-07-01), Eklund
patent: 4791879 (1988-12-01), Eklund et al.

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