Gradient calender

Details Gradient calender Gradient calender

D - Textiles, Paper

21

G

D21G 1/00 (2006.01)

Patent

CA 2169012

The invention concerns a gradient calender, comprising two calender rolls (1, 2) which form a calendering nip (N) between them, of which calender rolls at least one roll is a hard-faced calender roll which can be heated to a high temperature, the paper web (W) or equivalent being passed through the calendering nip (N) for hot calendering of the web (W). At least one of the calender rolls (1, 2) is arranged to be loaded towards the calendering nip (N) by means of a variable-crown support roll (5, 6) so that the auxiliary nip (N1, N2) between said support roll (5, 6) and the corresponding calender roll (1, 2) forms a common nip plane (A) with the calendering nip (N). Deflection of the calendering nip (N) and of the calender rolls (1, 2), respectively, is substantially prevented by the effect of the load produced by means of the hydraulic loading means (9, 13) in the support roll/rolls (5, 6).

L'invention porte sur une calandre à gradients comprenant deux cylindres de calandrage (1, 2) formant entre eux un intervalle (N) et dont l'un au moins est à revêtement dur et peut supporter des températures élevées, le rouleau de papier (W) ou son équivalent passant dans l'intervalle (N) pour y subir un calandrage à chaud. L'un au moins des cylindres est conçu pour pouvoir être pressé en direction de l'intervalle à l'aide d'un cylindre support à couronne flottante (5, 6) de manière à ce que les intervalles auxiliaires (N1, N2) entre ledit cylindre support (5, 6) et le cylindre de calandrage correspondant (1, 2) se situent dans un plan (A) comportant également l'intervalle (N). La flexion de l'intervalle (N) et celle du cylindre de calandrage (1, 2) sont pratiquement évitées sous l'effet de la charge fournie par des moyens hydrauliques (9, 13) placés à l'intérieur des cylindres supports (5, 6).

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