Valmet Paper Machinery Inc.

Valmet Technologies, Inc.

Kari Erkkilä

Kari Pellinen

Harri Vahatalo

Jukka Koiranen

Pekka Hilden

Juhani Ahola

The invention relates to a method in a fiber web machine. In the method, a fabric () included in the fiber web machine is used for supporting a web () produced by the fiber web machine. Moreover, in the method the location of the fabric () is changed in the cross direction (CD) of the fiber web machine. The location is changed by means of oscillation, the amplitude () of which is kept so high that the area of impact () of the web () on the fabric () is wider than the width () of the web () throughout the lifetime of the fabric (). The invention also relates to an arrangement in a fiber web machine, and to a software product.

Method and arrangement for fiber web machine, and software product

A method and apparatus for identifying a moving web in a paper making machine are disclosed. The method includes of the steps of illuminating the web with the light from a transmitter, reflecting the transmitted light off the web, receiving the reflected light with a light transducer to produce an electrical signal corresponding to the intensity of the received light, and identifying the moving web based on the received signal. The intensity of the transmitted light is adjusted so that the received light signal from the transducer is normalized with respect to an optimum value. The apparatus includes a light transmitter, a light receiver, and a control and identification circuit which identifies the web based on a signal from the light receiver, and which adjusts the intensity of the light transmitter to optimize the reception of the signal from the light receiver in order to minimize the effects of environmental interference.

Method and device for photoelectric identification of a material web

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Palokka, Finland

Kari Erkkilä