Metso Paper Inc.

Veli Käsmä

Kaisa Putkisto

Juha Maijala

Vilho Nissinen

Pentti Virtanen

Timo Nyberg

Pasi Rajala

Lars Grönroos

Hannu Niemelä

A paper, board or non-woven product containing a fiber layer containing cellulosic fibers, plant fibers or other material suitable for making a paper, board or non-woven product. One surface of the fiber layer is treated with pigment particles. The web is treated with microscopic particles whose average size is so small as to permit the particles to adhere to each other by van der Waals forces.

Paper having a cellulosic fiber layer treated with elementary particles

A powdery layer is formed on a first side of a web (W) which serves as a substrate by applying electrically charged particles on the web while a rotating grounding electrode is located at a second side of the web.

Electrostatic coating device with insulated grounding electrode

A method for preliminary treatment of particles of a powder in a dry surface treatment process before applying the powder particles on a surface of a substrate by utilizing an electric field created by electrodes. The Electrodes are located at opposite sides of the substrate in such a way that at least one first electrode is located at the side of the substrate to be coated, and at least one second electrode is located at the opposites side of the substrate. The particles of the powder are pre-charged before bringing them into the electric field.

Method for electrostatic coating of a paper web

A continuous web having a first surface and a second surface is coated with a coating powder by allowing the web to move between a first and a second electrode, which are in different potentials and are located on the opposite sides of the web, applying the coating powder on the surface of the web by utilizing the difference in the electric potential, and finishing the coated surface of the web. Both surfaces of the web are coated essentially simultaneously by using oppositely charged electrodes.

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Tampere, Finland

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