Blade metering unit and method for blade-coating a material web

Details Blade metering unit and method for blade-coating a material web Blade metering unit and method for blade-coating a material web

1998-01-29

1999-07-06

Bareford, Katherine A.

Coating processes

With post-treatment of coating or coating material

Gas jet or blast mechanically treats coating

427356, 427359, 118410, 118413, 118414, 118 63, B05D 304

Patent

active

059195240

ABSTRACT:
A method and apparatus for applying a coat mix to a high-speed running board or paper web by accurately premetering and pre-smoothing the applied coat with an applicator apparatus and then minimally doctoring the applied coat with an air knife. The applicator apparatus has a narrow slot-orifice extending in a cross-machine direction for facilitating high-speed laminar flow of coating mix into a gap region defined by confronting surfaces of the applicator apparatus and the web. The applicator apparatus has a member for directing the ejected coating mix in the gap region in a direction reverse to a travel direction of the web so that only a predetermined portion of the ejected coating mix is allowed to form an applied coat on the web. This accurate premetering of the coating mix by the applicator apparatus permits an operator to readily optimize the subsequent process of doctoring the applied coating with an air knife.

REFERENCES:
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patent: 5368893 (1994-11-01), Sommer et al.
patent: 5741550 (1998-04-01), Paloviita et al.
Wochenblatt Fur Papierfabrikation 23/24 1988, pp. 1053-1057 (No Month Date) .

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