Valmet Paper Machinery Inc.

Juha Mykkanen

Rauno Verner Rantanen

Markku Lummila

A method is provided for measuring and regulating the quantity of coating in surface sizing or pigmenting of paper or board, wherein the coating agent is spread by means of a coating device in the form of a film onto the face of a roll in a size press. The film is transferred from the roll face onto the paper or board in the size press nip. A fluorescent marker agent is mixed into the roll coating or into the coating agent and the measurement of the coating quantity is carried out by means of X-ray fluorescence technique from the face of the size press roll before the film of coating agent is transferred onto the web. The roll face or coating agent present in the roll face is irradiated with X-ray radiation to fluoresce the marker agent, and the fluoresced radiation emitted by the marker agent contaianed in the roll coating and attenuated by the coating agent, or the fluoresced radiation emitted by the marker contained in the coating agent is measured and converted to a value of thickness of the coating quantity. The invention further concerns an arrangement for carrying out this method.

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Jyvaskyla, Finland

Juha Mykkanen