Claims
- 1. A method of varying the application amount of coating agent applied by bladecoating of a moving web, preferably a paper web, by control of engagement pressure of a coating blade against the web, the web supported by a rotating support roller, said blade clamped into a blade holder along one longitudinal edge, an opposite longitudinal edge of said blade being in engagement with the web and being in a substantially arcuate shape with predetermined angle defined between a tip of the blade and the web so as to define an area of engagement, comprising, displacing a control pressure acting on a major surface of the blade in a transverse direction of the blade towards and away from the web and controlling the size of the control pressure to the blade position to provide a predetermined blade engagement pressure against the web by said displacing of the control pressure and to substantially constantly maintain the angle between the web and the blade tip.
- 2. A method according to claim 1, wherein the position dependent control pressure is provided by exerting the control pressure with a pressing means, which acts on the blade and by displacing the pressing means along a predetermined path in the transverse direction of the blade.
- 3. A method according to claim 2 wherein said path is substantially circle shaped.
- 4. A method according to claim 2 wherein said path is substantially ellipse shaped.
- 5. A method according to claim 1 wherein said force influence occurs simultaneously along the entire length of the blade.
- 6. A method according to claim 1 wherein said control pressure is provided by means of a pressing means or support means which is displacable along the concave side of the blade.
- 7. A method according to claim 1 wherein the displacement of the pressure means is data controlled depending on the application amount sensed.
- 8. A method according to claim 1 wherein a varying force influence is exerted along the length of the blade.
- 9. A method according to claim 8 wherein said varying force influence on the blade is provided via a bar which is flexible at least in a plane, and is located between the pressing means and the blade side facing the pressing means, said bar pressing the engaging blade.
- 10. A device for changing an amount of coating agent from a surplus of the coating agent applied to a moving web by blade coating by control of an engagement pressure of the coating blade against the web, the web being supported by a rotatable support roller, said blade being clamped in a blade holder along one longitudinal side of the blade, the opposite longitudinal side of said blade being initially forced into engagement with the web so that the blade tip has a predetermined angle with the web, means for displacing a pressure element acting on a major surface of the blade in a transverse direction of the blade towards and away from the web, and a control means for controlling selected displacement positions of the pressing element to exert a pressure and control the angle between the blade tip and the web substantially constant corresponding to different displacement positions of the pressing means.
- 11. A device according to claim 10, wherein the control means comprises a control curve which defines the blade deflections caused by the pressing means in the varying displacement positions, said blade deflections defining the pressure exerted by the pressing means.
- 12. A device according to claim 10 characterized in that the pressure element includes a pivotally arranged support with a support apex arranged adjustably along a path which substantially coincides with the arc shape of the blade, the support roller extending along the entire length of the blade and the support apex being connected to a shaft which is rotatably arranged at the blade holder, said support being arranged adjustably along a mainly circular path.
- 13. A device according to claim 11, wherein the pressing means includes the pivotally arranged support with a support apex arranged adjustably along a path which substantially coincides with the arc shape of the blade, the support extends along the entire length of the blade and that the support is connected to a shaft which is rotatably arranged at the blade holder, said support being arranged adjustably along a mainly circular path.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8502927 |
Jun 1985 |
SEX |
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Parent Case Info
This application is a continuation of application Ser. No. 873,529, filed June 12, 1986, now abandoned.
US Referenced Citations (5)
Foreign Referenced Citations (3)
Number |
Date |
Country |
3001073 |
Apr 1981 |
DEX |
79051645 |
Jun 1979 |
SEX |
2035144 |
Jun 1980 |
GBX |
Continuations (1)
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Number |
Date |
Country |
Parent |
873529 |
Jun 1986 |
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