Device for coating a web of material guided about a counter-roll

Details Device for coating a web of material guided about a counter-roll Device for coating a web of material guided about a counter-roll

1993-08-05

1995-10-24

Housel, James C.

Coating apparatus

Solid applicator contacting work

With work-handling or work-supporting

118246, 118258, 118263, 118413, B05C 502, B05C 108

Patent

active

054601193

DESCRIPTION:

BRIEF SUMMARY
CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a national phase of PCT/EP92/02031 filed Sept. 3, 1992 and based, in turn, on German national application P41 30 118.8 filed Sept. 11, 1991 under the International Convention.


TECHNICAL FIELD

The present invention relates to a device for coating a web of material guided about a counter-roller, particularly a paper or cardboard web.


BACKGROUND OF THE INVENTION

Known devices for the coating of running paper or cardboard webs have a coating mechanism swingable towards the web in the area where it wraps about the counter-roller and apply an excess of coating material e.g. coating paint. This portion of the mechanism is followed in the running direction of the web by a dosage system with a dosing element (e.g. a doctor blade) which wipes the excess off, down to the desired coating level.
From DE 39 16 620-A1 (Corresponding to U.S. Pat. No. 5,117,767) describes a device of this kind is known wherein the coating mechanism comprises an application roller drawing liquid from a liquid chamber and which is swingably supported with respect to the counter-roller. In the working position a narrow clearance (coating gap) is left between the coating roller and the counter-roller, this gap being completely filled by the provided coating paint. The coating mechanism can be swung away into a servicing position for maintenance, e.g. cleaning.
The dosing system comprises a doctor beam swingable towards the counter-roller with a doctor blade as a dosing element which can be pressed against the web supported by the counter-roller with an adjustable pressure and at a preselected angle, for the purpose of dosing the weight of the coating. The doctor beam with the dosing element can also be swung into a servicing position, e.g. for replacement of the doctor blade.
In a high-speed coating installation (web speed>600 m/min) it is required to swing the coating mechanism and/or the dosing system quickly and accurately in the respective working position at the counter-roller. It is also often necessary to swing the coating or dosing mechanism away very quickly from the respective working position, e.g. for instance when it passes a joint with a web splice, or in the case of defective spots or in the case of a web break. If the coating mechanism as well as the dosing system are supposed to be swung back and forth quickly, it becomes necessary to precisely coordinate the timing of the two swinging motions. On the one hand it has to be prevented that an undosed paint film is applied which would contaminate subsequent installation parts and soften and weaken the web, with the consequence of breaks in the web. On the other hand, a doctor blade should only be pressed against a dry web for a short period of time, because otherwise it can heat up and burn out due to high friction.


OBJECT OF THE INVENTION

It is the object of the invention to create a coating device of the aforementioned kind, wherein the coating mechanism and/or the dosing system can be brought very quickly to its working position at the counter-roller, as well as be very quickly swung away from this position.
This object is achieved in a device for coating a web of material, particularly a paper or cardboard web, guided about a counter-roller, with a coating mechanism fastened to pivot arms, whose coating element, particularly a coating roller can be swung from a servicing position into the working position at the counter-roller. The dosing system is fastened to pivot arms whose dosing element (doctor blade) is also swingable from a servicing position into a working position at the counter-roller. According to the invention the pivot mechanism of the coating mechanism and/or the dosing system each comprises, in addition to the piston-and-cylinder unit effecting the swinging motion from the servicing position into the working position, a hydraulic piston-and-cylinder unit which presses the swivel arms from the working position into an intermediate position.
According to the invention when the coating mechan

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