Metso Paper Automation Oy

Metso Automation Oy

Neles Automation Oy

Hannu Moisio

Mauri Ojala

Jussi Graeffe

Jari Koivu

Timo Saikanm&auml;ki

Timo Saikanmaki

The measuring device comprises at least one measuring head having a reference part, which comprises a reference surface against which the moving web is supported. The reference surface comprises a measuring area in the inside of which the property of the web is measured. The reference part is arranged in connection with the measuring head in such a way that below the reference part, there is a substantially open air space. The measuring head comprises means for generating negative pressure in the air space below the reference part, and the reference part comprises holes formed through it, in such a way that the negative pressure generated in the air space affects through the reference part the space between the reference surface and the moving web in such a way that the web is supported against the reference surface substantially over the whole area of the measuring area.

Method and measuring device for measuring at least one property of moving web

A method and an arrangement for keeping a measuring device clean, the measuring device being arranged to measure at least one property of a moving web and comprising at least one measuring head with at least one measuring element that is cleaned with cleaning agent during measurement.

Method and arrangement for keeping measuring device clean

A measuring probe in a paper measuring apparatus is kept at a distance from the surface of the paper by feeding medium between the paper and a surface of the measuring probe through a feed hole in the surface of the measuring probe. The pressure of the supplied medium, the dimensions of the feed hole and measuring probe, and the distance of the probe surface from the paper are arranged such that after the medium is discharged from the feed hole, the rate of the flowing medium increases so as to produce an underpressure, which generates a force tending to move the paper and the measuring probe toward each other. The discharge of the medium from the feed hole produces an opposite force urging the paper and probe away from each other, and the measuring probe and paper settle in a state of equilibrium determined by the two forces.

Method of measuring properties of paper, and arrangement in a paper measuring apparatus

The invention relates to an apparatus for measuring properties of a moving paper web or cardboard web. The apparatus comprises a sensor and a counterpart. The sensor comprises at least one coil. The sensor is arranged on a first side of the moving web and the counterpart is arranged on a second side of the moving web. The coil comprises a plurality of layers, each layer constituting a part of the coil, the layers being superimposed and coupled in series to constitute the coil.

Apparatus for measuring properties of a moving paper web or cardboard web

The invention relates to a method and an apparatus for measuring properties of a moving web, a sensor ( ) being arranged on a first side of the moving web ( ), the sensor comprising a differential coil ( ), which comprises at least two coils, and a reference plate ( ). A sensor plate ( ) is arranged on a second side of the moving web ( ). Electric current is used to induce a voltage to the differential coil ( ). The voltage of the differential coil ( ) varies as the web ( ) changes the effect caused by the sensor plate ( ) to the differential coil. The properties of the web ( ) are determined by measuring the voltage of the differential coil ( ).

Method and apparatus for determining properties of a moving web with a differential coil sensor

The invention relates to a method and apparatus for measuring paper color. Paper color is measured from the surface of a paper roll on a winder. As the size of the paper roll grows, a measuring device is moved in such a way that the angle between the measuring device and the surface of the paper roll is kept substantially constant and, at the same time, the distance of the measuring device from the surface of the paper roll remains substantially constant

Method and apparatus for measuring paper color

The invention relates to a method and apparatus for measuring the caliper of paper substantially continuously during papermaking. A sensor (,) is arranged above and/or under the paper (,), the sensor (,) measuring the caliper of the paper (,) at least on one side of the paper (,) mainly without contacting the surface of the paper (,). At given intervals the sensor (,) measuring mainly without contact is brought into momentary contact with the surface of the paper (,).

Method and apparatus for measuring caliper of paper

The invention relates to a method of keeping a measuring window of a measuring device clean, and to a measuring device. Gas is blown onto the surface of the measuring window (2) of the measuring device (1). Gas is guided onto the measuring window (2) by a nozzle (3) which is substantially on the same level with the measuring window (2).

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Kangasala, Finland

Hannu Moisio