Deflection-compensated doctor blade beam

Details Deflection-compensated doctor blade beam Deflection-compensated doctor blade beam

1991-12-11

1993-12-14

Jones, W. Gary

Coating apparatus

Solid member or material acting on coating after application

118123, 118101, 118126, 118413, 162281, B05C 1104

Patent

active

052698467

ABSTRACT:
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.

REFERENCES:
patent: 3134126 (1964-05-01), Phillips
patent: 3245378 (1966-04-01), Caple et al.
patent: 4092916 (1978-06-01), Link et al.
patent: 4097528 (1990-03-01), Sollinger
patent: 5005515 (1991-04-01), Sollinger
patent: 5032229 (1991-07-01), Boucher

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