Method of producing boards by foam forming

The present invention concerns a method for producing a board, wherein a foamed fibrous layer is formed by contacting foam forming of a fibrous slush and said foamed fibrous layer is dried to form a web, wherein polyvinyl alcohol is used as a foaming agent in foam forming. The invention also concern...

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Bibliographische Detailangaben
Hauptverfasser:	Karita Kinnunen, Tuomo Hjelt
Format:	Patent
Sprache:	swe
Schlagworte:	IMPREGNATING OR COATING OF PAPER METHODS OF PRODUCING PAPER THEREON PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PAPER-MAKING MACHINES PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PULP COMPOSITIONS TEXTILES TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
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Beschreibung
Zusammenfassung:	The present invention concerns a method for producing a board, wherein a foamed fibrous layer is formed by contacting foam forming of a fibrous slush and said foamed fibrous layer is dried to form a web, wherein polyvinyl alcohol is used as a foaming agent in foam forming. The invention also concerns a system for producing a board and a board with at least one dried foamed fibrous layer, wherein the foamed fibrous layer is made from a mixture of fibrous slush with foam formed from water and polyvinyl alcohol.