Blowbox for use in a plant for drying a material web

D - Textiles – Paper – 21 – F

Patent

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Details

D21F 5/18 (2006.01) B65H 23/24 (2006.01) F26B 13/20 (2006.01)

Patent

CA 2235836

A blow box (2) for use in a plant for drying a material web (1), comprises an essentially horizontal upper box wall (3) having formed therein circular orifices (5) and so-called eyelid perforations (6), each one of which consists of a slit (7) which extends in parallel with the centre line (C) of the upper box wall (3) and of a depression (8) formed in the upper box wall (3) adjacent one side of the slit. The eyelid perforations (6) are arranged in two rows in parallel with the centre line (C), and together they form a zigzag pattern about the centre line (6) which intersects the depressions (8) of the eyelid perforations (6) in both rows. The orifices (5) are disposed in a first and a second pair of rows (9a, 9b, and 10a, 10b, respectively) with both rows in each pair positioned on either side of and spaced equally from the centre line (C). The upper box wall (3) has a shallow continuous arcuate shape across its entire width.

Caisson (2) de soufflage destiné à être utilisé dans une installation pour sécher une bande (2) de matériau, qui comporte une paroi (3) supérieure horizontale dans laquelle sont ménagés des orifices circulaires (5) et des perforations (6) en forme de paupière dont chacune consiste en une fente (7) qui s'étend parallèlement à la ligne centrale (C) de la paroi (3) supérieure et en une dépression (8) formée dans la paroi (3) supérieure adjacente à un côté de la fente. Les perforations (6) en forme de paupière sont disposées en deux rangées parallèles à la ligne centrale (C) et elles forment ensemble un motif en zigzag autour de la ligne centrale (C) qui coupe les dépressions (8) des perforations (6) en forme de paupière des deux rangées. Les orifices (5) sont disposés selon une première et une sonde paire de rangées (9a, 9b et 10a, 10b respectivement), les deux rangées de chaque paire étant placées de chaque côté de la ligne centrale (C) et espacées également par rapport à cette dernière. La paroi (3) supérieure possède une forme légèrement arquée continue sur toute sa largeur.

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