Method and apparatus for controlling the thickness of a coating

Details Method and apparatus for controlling the thickness of a coating Method and apparatus for controlling the thickness of a coating

1996-10-08

1997-07-22

Bareford, Katherine A.

Coating processes

With post-treatment of coating or coating material

Gas jet or blast mechanically treats coating

118 63, B05D 304

Patent

active

056502001

ABSTRACT:
In air-knife coating, the coating mix is applied to the paper or board web by a coating applicator, and the coating mix is doctored to the desired coating thickness by blowing a sharp air jet discharged from an air knife. The air knife doctoring separates coating mix that has not been absorbed by the web forming a filter-cake layer. The air knife is directed at the upper boundary between the filter-cake layer and the un-absorbed coating mix. The coat weight is controlled by adjusting the distance between the point of initial application of the coating mix to the web and the point of doctoring where coating mix is removed.

REFERENCES:
patent: 3329523 (1967-07-01), Best et al.
patent: 3783823 (1974-01-01), Sievert et al.
patent: 4858553 (1989-08-01), Westergard et al.
patent: 4980207 (1990-12-01), Sollinger
patent: 5101760 (1992-04-01), Sollinger
patent: 5112653 (1992-05-01), Damrau et al.
patent: 5179909 (1993-01-01), Sollinger
patent: 5368893 (1994-11-01), Sommer et al.

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