Raute Oyj

Momentive Specialty Chemicals Inc.

Jouni Rainio

Raili Kaarina Virtanen, Legal Representative

Ari-Pekka Tiusanen

Timo Miinalainen

Gatja Ronka

Petri Lammi

Matti Virtanen

Gatja Rönkä

An adhesive composition for use in the manufacture of wood-based boards, wherein the adhesive composition is foamable and comprises a resin, a filler and a foaming agent without any cationic acrylamide copolymer. According to the invention, the adhesive composition contains 40-80 wt % resin, 5-30 wt % filler, 0-40 wt % solvent, and 0.1-10 wt % foaming agent, which has been selected from organic and/or inorganic surface-active sulfate, sulfonate, phosphate or phosphonate compounds or their derivatives or mixtures.

Adhesive composition

The invention relates to a method and a device for foaming glue for the production of wood-based sheets. Gluing substance and gas are fed () into the foaming device through nozzles (), which are directed to mix the gluing substance and gas to be fed to form an essentially homogenous mixture prior to foaming. After this the gluing substance is foamed mechanically in the foaming chamber () with the aid of gas.

Foaming method and device

A nozzle unit for the spreading of foamed glue onto a flat surface in the production of wood-based sheets, wherein the nozzle unit has a feeder canal () for directing glue into the nozzle unit, a row of nozzles () for directing glue from the nozzle unit onto a flat surface and also a distribution canal network between the feeder canal and the nozzles for distributing glue evenly to the nozzles. According to the invention, the area of the distribution canal network has a compensation canal () closed to/from external, that forms a free flow channel between the branches of the distribution canal network leading to the nozzles ().

Nozzle unit

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Puhos, Finland

Jouni Rainio