Metso Paper Inc.

Mika Saari

Ilkka Rata

Reijo Hassinen

Samppa J Salminen

Juhani Vestola

Ilkka Eskelinen

Antti Leinonen

Markku Lyytinen

Jukka Samppala

Seppo Parviainen

Tuomo Juvakka

Juha Isometsä

Kari Paloniemi

Pentti Luoma

Aimo N&auml;rv&auml;inen

Kari Lamminm&auml;ki

Jouni Heiskanen

Jari Jonkka

The operation of a doctor assembly () in a paper machine is monitored. In case of a malfunction, the paper machine's () control devices (-) are used to carry out the necessary measures for eliminating the malfunction and carrying out repair and/or protective measures. In addition, detector devices () are arranged in connection with the doctor assembly (), to detect a malfunction. The detector devices () are connected to the control devices () of the paper machine (), in order to carry out the said measures automatically. The invention also relates to doctor assemblies in a paper machine for implementing the method.

Method for monitoring the operation of a doctor assembly in a paper machine and a doctor assembly for implementing the method

A multi-cylinder dryer of a paper machine, has at least one drying cylinder ( ) and at least one roll ( ) located at a different height to the cylinder and at a distance to it in the machine direction. A paper web ( ) travels from the drying cylinder ( ) to this roll ( ). Dry air is brought to the dryer through a beam ( ) located in front of the web ( ) in the machine direction, the air is directed by means of nozzles ( ) in the beam into a throat ( ) between the drying cylinder ( ) and the web ( ) mainly to intensify the drying effect. A doctor ( ) keeps the surface of the drying cylinder clean. The beam ( ) forms with the roll ( ) a smooth, high channel ( ), at least on the side of the roll ( ), for the passage of the web during a disturbance.

Arrangement in the drying section of a paper machine

The invention relates to a doctor apparatus ( ) in connection with a roll (T) in a paper or board machine. The doctor apparatus ( ) comprises a doctor beam ( ) of lightweight construction and that the doctor beam ( ) is arranged to pivot on bearing means ( . . . ) (pivot movement arrow L ). In connection with the doctor beam there are loading members ( ), a relative linear movement taking place between the loading members ( ) and backup surfaces ( &prime;) when the doctor beam ( ) is being oscillated.

Doctor equipment in connection with a roll/cylinder in a paper/board machine

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Jyväskylä, Finland

Mika Saari