Arrangement of threading in a calender

D - Textiles – Paper – 21 – G

Patent

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Details

D21G 1/00 (2006.01) D21G 9/00 (2006.01)

Patent

CA 2308152

The invention concerns an arrangement of threading of a paper web (W) in a supercalender, which comprises an upper roll (12), a lower roll (13), and a stack of rolls consisting of intermediate rolls (14...23) and fitted between said upper and lower roll. The rolls (12...23) in the calender are in nip contact (Ni...Ni i) with one another. At the sides of the stack of rolls, alternatingly at the left side and at the right side, a take-out leading roll (101...110) has been fitted at each intermediate roll (14...23). The arrangement of threading comprises at least one loop of a transfer belt (Z), which is penetrable by air and which runs outside the edge of the paper web (W) through at least two nips (Ni...Nii) in the calender. The transfer belt (Z) passes the lead-in strip (W1) of the paper web through at least one nip (Ni...Nii) in the calender. In addition to this, the arrangement of threading comprises at least one suction box (201...205; 210....219), which is placed on a free run of the paper web (W) and of the transfer belt (Z) between intermediate rolls ( 14...23) and take-out leading rolls ( 101...110) in the calender. The lead-in strip is kept in contact with the transfer belt by means of the suction of a suction box.

L'invention concerne un agencement du défilage d'une feuille continue de papier (W) dans une supercalandre, comprenant un rouleau supérieur, (12), un rouleau inférieur (13), ainsi qu'un empilement de rouleaux composé de rouleaux intermédiaires (14...23), ajustés entre le rouleau supérieur et le rouleau inférieur. Les rouleaux (12...23) de la calandre sont en contact de pincement (N1...N11) les uns avec les autres. Au niveau des côtés de cet empilement, on a monté de manière alternée, du côté gauche et du côté droit, un rouleau d'entraînement preneur (101...110), à hauteur de chaque rouleau intermédiaire (14...23). L'agencement de défilage du papier comprend au moins une boucle d'une bande de transfert (Z), perméable à l'air, laquelle court sur l'extérieur du bord de la feuille de papier (W) en passant au moins à travers deux pincements (N1...N11) de la calandre. Cette bande de transfert (Z) fait passer la bord d'attaque (W1) de la feuille de papier à travers au moins un pincement (N1...N11) de la calandre. En outre, cet agencement de défilage du papier comprend au moins un caisse aspirante (201...205; 210...219), placée sur un trajet libre de la feuille de papier (W) et de la bande de transfert (Z), entre des rouleaux intermédiaires (14...23) et des rouleaux preneurs (101...110) de la calandre. Le bord d'attaque de la feuille est maintenu en contact avec la bande de transfert sous l'effet d'aspiration d'une caisse d'aspiration.

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