Method of producing multi-ply paper and board products exhibiting increased stiffness

The stiffness of multi-ply paper and board products is increased by dewatering the base ply on the papermaking machine to a consistency of at least about 8% prior to application of the next ply. The desired laminating consistency is more readily achieved through the use of pulp which has been subjec...

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Bibliographische Detailangaben
Hauptverfasser:	YASNOVSKY, VACHESLAV, WAGLE, DINKAR G, NELLI, LEO MICHAEL
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPARATUS THEREFOR FIBREBOARD IMPREGNATING OR COATING OF PAPER MANUFACTURE OF ARTICLES FROM CELLULOSIC FIBROUS SUSPENSIONS ORFROM PAPIER-MACHE 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 PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCESFROM CELLULOSE-CONTAINING MATERIALS PULP COMPOSITIONS REGENERATION OF PULPING LIQUORS TEXTILES TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G
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Beschreibung
Zusammenfassung:	The stiffness of multi-ply paper and board products is increased by dewatering the base ply on the papermaking machine to a consistency of at least about 8% prior to application of the next ply. The desired laminating consistency is more readily achieved through the use of pulp which has been subjected to a heat treatment process comprising heating the pulp at a temperature in the range of 170 DEG C to 250 DEG in the presence of water for at least about 0.1 minutes, which reduces the water retention valve of the pulp. The heat treated pulp also produces a stiffer multi-ply product in its own right, which augments the stiffness advantage connected with attainment of higher laminating consistencies.