Metso Paper Inc.

Valmet Technologies, Inc.

Jukka Koskinen

Juha Lipponen

Timo Kiiha

Heikki Vatanen

Timo Nurmiainen

Jukka Mäkinen

Ilpo Honkanen

Kai Aalto

A method and apparatus for exhausting gas from a coating material. The coating material is fed in the bottom part area of a drum () rotating around an essentially vertical axis inside a vacuum tank (), whereby the rotating motion of the drum causes the coating material to rise up the inner wall of the drum and to discharge from the upper edge of the drum as a thin film against the inner wall of a vacuum tank, wherefrom the coating material flows downwards. The coating material is arranged to rise up the wall of the drum stepwise, so that the coating material will form a thin veil-like film on at least two different step levels (-), whereupon the gas bubbles in the coating material will break and be discharged from the coating material.

Method and arrangement for exhausting gas from a coating material

A method for controlling the deflection and/or position of a deflection-compensated doctor blade support beam relative to a web. The movement range of the doctor blade support beam is divided into radial control sectors so that the working directions of compensation elements in the support beam essentially form interface limits of the radial control sectors. When the support beam is to be moved, a set point is selected toward which a reference point of the support beam should move. The specific control sector is then determined within which the set point is located and this control sector becomes the active control sector. Deflection of the doctor blade support beam employs these two compensation elements so that one is used for controlling the deflection in the x-axis direction of the coordinate system, while the other is used for controlling the deflection in the y-axis direction of the coordinate system.

Method for controlling deflection and/or position of a deflection-compensated doctor beam

A curtain coater and a curtain-coating method for coating a moving web of paper or board are described. The curtain coater has an applicator nozzle for applying a coating mix to the surface of the web in the form of a continuous curtain extending uniformly over the cross-machine width of the web. In one aspect, a doctoring means located upstream (in terms of the direction of travel of the web) from the applicator nozzle substantially removes the air boundary layer traveling on the surface of the web. In another aspect, the doctoring means comprises a suction nozzle for removing the air boundary layer. In yet another aspect, a gas nozzle located downstream from the applicator nozzle sprays gas on the coating curtain in order to help apply the coating mix to the surface of the web.

Curtain coater and method for curtain coating

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Järvenpää, Finland

Jukka Koskinen