Valmet Paper Machinery Inc.

Risto Makinen

Marko Tiilikainen

Juhani Eskelinen

Jari Tiitta

Markku Järvensivu

Matti M Kemppainen

Petri Asikainen

Raimo Pesonen

Sami Lumijarvi

Rami Maki-Tulokas

Teppo Kojo

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 (8), and a support tube (4) placed inside the frame (3). The support tube (4) is backed against the frame (3) preferably with three asymmetrically placed compensating elements (5), which advantageously are pressurized hoses. The deflection of the doctor blade beam is accomplished by varying the volume of the compensating elements (5) through pressure alterations in the elements. A displacement of desired direction can be achieved by differentially pressurizing the three compensating elements (5). By using this apparatus, 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 this data either automatically or manually.

Deflection-compensated doctor blade beam

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Jarvenpaa, Finland

Risto Makinen