Coating apparatus – Solid member or material acting on coating after application – Running length work
Patent
1997-11-24
1999-08-17
Edwards, Laura
Coating apparatus
Solid member or material acting on coating after application
Running length work
118126, 118413, 118419, B05C 2100
Patent
active
059388447
DESCRIPTION:
BRIEF SUMMARY
SPECIFICATION
CROSS REFERENCE TO RELATED APPLICATION
This application is a National Phase of PCT/EP 97/02166 filed Apr. 26, 1997 and based, in turn, on German National Application 196 17 458.9 filed May 2, 1996 under the International Convention.
FIELD OF THE INVENTION
The invention relates to a support system for a dosing or metering element of a coating device, particularly the doctor blade of a coating device for paper or cardboard webs.
BACKGROUND OF THE INVENTION
The known coating devices for paper or cardboard webs have an application mechanism (roller mechanism or nozzle applicators), by means of which the coating material, e.g. coating dye, is applied to the web in excess. A dosing or metering system provided with a dosage element, arranged downstream of the application mechanism, wipes the excess off to leave the desired coating weight. The setting of the coating weight (weight per unit area of the coated web) is done through the contact pressure of the dosage element on the web, which in the coating region is supported by a backing roll.
During the coating of paper or cardboard webs variations of the cross section profile of the webs occur as a result of production conditions, which make it necessary to set the contact pressure of the dosage element over the work width with local differences, in order to achieve an even coating. When a doctor blade is used as the dosage element, the latter is supported at its back side by a support strip pressing from underneath, this strip being bendable within limits and adjustable along the support line by means of tension and compression screws, depending upon whether the coating weight is too high or too low at the respective locations (see German patent document DE-C 2825 907).
A generic support system is known from International patent document W)93/05887, wherein the doctor blade is supported by a flat strip, which is continuous in the area of its frontal edge resting against the doctor blade and has a number of longitudinal slits for sufficient flexibility to allow for different pressure settings of the doctor blade. A lever engages each tongue between two slits and the lever can be actuated via a pneumatic cushion, by means of which the segments of the support strip can be deformed individually in the direction of the doctor blade, in order to set a certain contact pressure.
OBJECTS OF THE INVENTION
It is the object of the invention to improve a generic support system so that with a simple construction locally different contact pressures against a dosage element can be set.
SUMMARY OF THE INVENTION
A according to the invention the support strip consists of a spring steel sheet which has a row of longitudinal slits separating respective tongues from one another. The tongues formed in this way are securely clamped on their side turned away from the dosage element, while the continuous frontal edge is movably supported between guide strips in the direction of the dosage element. Adjustment elements engage at the tongues, which cause the tongues to bend vertically with respect to the span of the tongues. The vertical bending of the tongues with respect to their span leads to a change in their effective length, which due to the clamping on one side and the guidance on the other side translates into a change in the configuration of the frontal edge at the respective location. In this way the contact pressure of the support strip of the dosage element can be modified in this area.
The contact pressure of the dosage element can be produced by means of a row of pressure chambers. Each pressure chamber is connected through a line which is closable by a valve with a common pressure tank, which is connected to a source of compressed air via a controllable valve, particularly a proportional valve.
BRIEF DESCRIPTION OF THE DRAWING
The above and other objects, features, and advantages will become more readily apparent from the following description, reference being made to the accompanying drawing in which:
FIG. 1 is a longitudinal section through a
REFERENCES:
patent: Re33741 (1991-11-01), Boissevain
patent: 4440105 (1984-04-01), Jeltema
patent: 5597415 (1997-01-01), Graf
Dubno Herbert
Edwards Laura
Jagenberg Papiertechnik GmbH
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