D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 1/10 (2006.01) D21F 1/48 (2006.01) D21F 1/52 (2006.01) D21F 9/00 (2006.01)
Patent
CA 2072271
The invention concerns a twin-wire web former in a paper machine, comprising a carrying wire and a covering wire which together form a twin-wire forming zone. In this forming zone, a forming unit is fitted, which comprises a forming board and a drainage box placed one opposite the other. In the forming board placed facing the drainage box there are a number of transverse loading ribs placed at a distance from each other. Subsequent loading ribs are interconnected by intermediate parts which, together with the loading ribs form ribbed shoes. These shoes can be loaded by means of loading hoses to produce a dewatering pressure in the web (W) placed between the wires. In the area of the forming unit the dewatering takes place both through the covering wire and through the carrying wire also towards the forming board through the open spaces placed between its loading ribs.
Cette invention concerne une machine à papier à deux toiles, soit une toile porteuse et une toile supérieure. Dans la zone de formation à double toile se trouve une unité de formation composée d'un marbre et d'une caisse d'essorage disposés l'un en face de l'autre. Le marbre faisant face à la caisse d'essorage comporte un certain nombre de nervures de pression transversales, espacées. D'autres nervures de pression interconnectées par des pièces intermédiaires forment, avec les précédentes nervures, des sabots de formation nervurés que l'on peut charger au moyen d'un mécanisme hydraulique pour produire une pression d'essorage sur la pâte placée entre les deux toiles. Dans la zone de formation, l'essorage se fait à travers à la fois de la toile supérieure et de la toile porteuse, ainsi qu'en direction du marbre, l'eau s'écoulant dans ce cas entre les nervures de pression.
Sim & Mcburney
Valmet Corporation
LandOfFree
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