Dryer-section concept and method in the drying of a...

D - Textiles – Paper – 21 – F

Patent

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D21F 5/04 (2006.01)

Patent

CA 2218114

The invention concerns a dryer-section concept of a paper/board machine and a method in the drying of a paper/board web (W). The dryer section comprises a number of drying cylinder groups (R I...R N), which comprise a single-wire draw, on whose support the web (W) is guided so that it meanders as loop-shaped from a drying cylinder onto a suction cylinder. The web (W)/the wire (H) is guided so that the web is placed against the face of the drying cylinder and the wire is placed outside. In the dryer-section concept, the web (W) is passed from one drying cylinder group (R I) into the next dryer group (R II) and further. According to the invention, at least some of the drying cylinders (K'1, K'2, K'3) include impingement units (100, 101, 102) or equivalent in connection with them, through which units a heated medium, preferably air or steam, is passed through the wire into connection with the web (W) so as to produce a two-sided drying effect and to increase the drying capacity.

La présente invention concerne des principes applicables à un séchoir de machine à papier ou carton et un procédé de séchage d'une feuille continue (W) de papier ou carton. Le séchoir est constitué de plusieurs groupes de cylindres essoreurs (RI, ..., RN) à entraînement par une seule toile servant de support à la feuille continue (W). Le guidage fait que la feuille continue forme des méandres fermés entre cylindre essoreur et cylindre d'aspiration, la feuille continue (W) et la toile (H) circulant de façon à faire passer la feuille contre la surface du cylindre essoreur, la toile se présentant vers l'extérieur. Le principe du séchoir fait que la feuille continue (W) passe d'un groupe de cylindres essoreurs (RI) au suivant (RII), et ainsi de suite. Selon la présente invention, de tels cylindres essoreurs (K'1, K'2, K'3) sont équipés de hottes de soufflage (100, 101, 102) ou analogues qui viennent à leur contact. Ces hottes de soufflage servent à entraîner un milieu chaud, de préférence de l'air ou de la vapeur, au travers de la toile, au niveau où la toile est en contact avec la feuille continue (W), ce qui a pour effet de produire un séchage recto-verso et d'augmenter la capacité de séchage.

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