FORMING OF A PAPER OR BOARD WEB IN A TWIN-WIRE FORMER OR IN A TWIN-WIRE SECTION OF A FORMER

The former overcomes asymmetric dewatering of a web and permits increased speed with improved two-sidedness. Fibrous stock is supplied by a paper or board machine headbox (1) between looped forming wires (11, 12). Water is removed in a first dewatering zone (Z1) formed with a fixed forming shoe (3)...

Ausführliche Beschreibung

Gespeichert in:

Bibliographische Detailangaben
Hauptverfasser:	ODELL, MICHAEL, KORHONEN, HANNU, PUURTINEN, ARI, ANTTILAINEN, SAMI, IRWIN, JEFFREY C, POIKOLAINEN, ANTTI
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	METHODS OF PRODUCING PAPER THEREON PAPER-MAKING PAPER-MAKING MACHINES PRODUCTION OF CELLULOSE TEXTILES
Online-Zugang:	Volltext bestellen
Tags:	Tag hinzufügen Keine Tags, Fügen Sie den ersten Tag hinzu!

Beschreibung
Zusammenfassung:	The former overcomes asymmetric dewatering of a web and permits increased speed with improved two-sidedness. Fibrous stock is supplied by a paper or board machine headbox (1) between looped forming wires (11, 12). Water is removed in a first dewatering zone (Z1) formed with a fixed forming shoe (3) having a curved surface against which a wire (12) is supported while the opposite wire (11) is unsupported in the area of the shoe (3). Water is removed in a second dewatering zone (Z2) formed by fixed dewatering blades (21) on the other side of the wires (11, 12) and supported against the stock therebetween (21) and on the opposite side of the wires (11, 12) by dewatering blades (24), loaded in a controlled manner against the fixed dewatering blades (21) at gaps (22) between these so that pulsating dewatering is caused in the second zone (Z2). The wires (11, 12) are guided so the shoe (3) causes essentially non-pulsating dewatering in the stock.