B - Operations – Transporting – 05 – C
Patent
B - Operations, Transporting
05
C
B05C 21/00 (2006.01) B05C 11/04 (2006.01) D21G 3/00 (2006.01)
Patent
CA 2057329
The present invention concerns a deflection-compensated doctor blade beam of a coater used for coating web materials. The doctor blade beam comprises a box-section frame (3), together with a holder 2) of the doctor blade, and a support tube (4) placed to the interior of the frame (3). The support tube (4) is backed against the frame (3) by means of three asymmetrically placed compensating elements (5), which advantageously are pressurized hoses. The deflection of the doctor blade beam is compensated for by varying the volume of the compensating elements (5) through pressure alterations in the elements. A displacement of desired direction can be achieved by means of three compensating elements (5) in the plane of the blade beam's cross section. By virtue of the achieved displacement, the deflection of the doctor blade can be compensated to full straightness. The compensating system is controlled with the help of a feedback loop using data from a direct measurement of beam deflection, or alternatively, from the coat thickness profile. The straightness of the beam can be controlled on the basis of measurement data either automatically or manually.
Eskelinen Juhani
Jaervensivu Markku
Maekinen Risto
Eskelinen Juhani
Gowling Lafleur Henderson Llp
Jaervensivu Markku
Maekinen Risto
Valmet Paper Machinery Inc.
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