Method and apparatus in the drying section of a paper making...

Details Method and apparatus in the drying section of a paper making... Method and apparatus in the drying section of a paper making...

D - Textiles, Paper

21

F

34/39

D21F 5/00 (2006.01) D21F 5/04 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2015344

A method and apparatus in a drying section of a paper making machine wherein a so-called single-wire draw is applied and wherein blow boxes (20) are used, which are intended to prevent phenomena that disturb the mutual support contact between the web (W) and the drying wire (12). The blow boxes (20) extend across the entire width of the web (W), and they communicate with members (17, 18, 21, 22) that supply blow air, and they are provided with at least two nozzle slots (13, 14) transverse to the running and longitudinal direction of the web (W) as well as with a carrier face (16) between said nozzle slots. Negative pressure is produced in the space (A-) defined by the carrier face (16) and the drying wire (12) by means of the ejection and prevention effects of the air jets (F1, F2) blown through the nozzle slots (13,14). In order to speed the threading of the web (W), in the blow boxes (20) the blow sections (24 k+l...24 N) that remain outside the transverse area (A) of the leader band (R) are closed. The blowing, which has thereby been intensified, is applied through both of the opposite nozzles (13, 14) of the blow boxes (20) in connection with the threading only within the area (A) comprising the width (LR) of the leader band (R).

Cette invention concerne une méthode et un dispositif mis en oeuvre dans la sécherie d'une machine à papier et faisant appel à un transfert sur toile simple et des caissons de soufflage (20) dont le rôle est de prévenir les turbulences ayant pour effet de décoller la bande de papier (W) de la toile de séchage (12). Les caissons de soufflage (20) font toute la largeur de la bande de papier, sont alimentés par des canalisations (17, 18, 21, 22) et comportent au moins deux fentes de soufflage (13, 14) perpendiculaires au sens de défilement de la bande de papier (W), ainsi qu'une face portante (16) entre lesdites fentes. Une pression négative est engendrée dans l'espace (A-) entre la face portante (16) et la toile de séchage (12) grâce à l'effet de succion des jets d'air (F1, F2) sortant par les fentes de soufflage (13, 14). Pour accélérer l'engagement de la bande de papier (W), les sections (24 k+l...24 N) des caissons de soufflage (20), qui se trouvent à l'extérieur de la surface transversale (A) de l'amorce (R) sont fermées. Le soufflage qui est ainsi intensifié se produit à la fois par les deux fentes de soufflage opposées (13, 14) des caissons de soufflage (20) lors de l'engagement seulement dans la zone (A) englobant la largeur (LR) de l'amorce.

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