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1. WO2006100345 - CALENDER AND A METHOD IN CALENDERING FIBRE WEB, ESPECIALLY PAPER OR BOARD WEB

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

[ EN ]

Claims

1. A calender which comprises at least two calender rolls which form a calendering nip (N) between them, of which rolls one is a heatable calender roll, i.e., a thermo roll (13), characterised in that at least one of at least two rolls of the calender (10) is a zone-controlled calender roll (15) the shell (16) of which is of composite material, which zone-controlled roll (15) comprises a roll frame which comprises a shaft and load shoes (14) located parallel at least in one row in the longitudinal direction of the roll arranged in connection with the shaft (11) and a rotating flexible shell arranged around the load shoes, the position of which shell is controllable via the loading of each load shoe the speed being 400-3,500 m/min, and that the relation of the weight of the shell (16) to the roll frame is 0.1- 0.025.

2. A calender according to claim 1, characterised in that the calender is a multi-roll calender, in which to the lower position of a roll stack formed by at least two rolls is placed a zone-controlled roll (15) with a composite shell the shell of which is fixed and to the upper position of which is placed a zone-controlled roll (15) with a composite shell the shell of which is moving.

3. A calender according to claim 1 or 2, characterised in that, for loading the calender, load members (14) pressurising the zones of zone-controlled rolls placeable in the upper and the lower position are arranged to be pressurisable with desired pressure.

4. A calender according to claim 1, characterised in that the calender is modernised to a multi-roll calender so that as the calender roll (15) is arranged a zone-controlled roll (15) with a composite shell which has replaced two former rolls of the roll stack when modernising the calender.

5. A calender according to claim 1, characterised in that, in the calender, the calender roll (15) is arranged as a deflectable roll which is provided with members implementing deflecting for achieving clearance to the edge areas of the calendering nip (N) to the external end areas of the web (W) to be calendered for controlling the edge areas.

6. A calender according to claim 1, characterised in that the calender has one or several calendering nips (N) and that the second roll of each calendering nip is a zone-controlled roll (15) with a composite shell so that each load shoe (14) of the roll is controllable of its load, whereby all calender nips are profiling.

7. A calender according to claim 1 or 5, characterised in that, at a certain distance in the ends of the roll, there are one means implementing deflecting, advantageously on the opposite side of the profiling member, whereby the cross-directional width of the calendering nip is controllable.

8. A calender according to claim 7, characterised in that there are several deflecting means at an angle in relation to each other.

9. A calender according to claim 1, characterised in that the bearing arrangement of the roll comprises a slide bearing and a horizontal bearing arranged in connection with it for eliminating the barring phenomenon.

10. A calender according to any one of claims 1 to 9, characterised in that the composite-shelled roll (15) of the calender comprises separately controllable load members for implementing longitudinal profiling so that the thickness profile of the web (W) directed via the calendering nip (N) is controlled in the cross direction of the web (W).

11. A calender according to any one of preceding claims 1 to 5, characterised in that, in the calender, into connection with the composite-shelled roll (15) are arranged measuring instruments for controlling profiling based on the measuring results given by the measuring instruments via the load elements (14).

12. A calender according to any one of preceding claims, characterised in that, in the calender, the zone roll (15) with a composite shell is placed as the roll forming the first calendering nip (N) of the calender roll stack (10).

13. A calender according to any one of preceding claims, characterised in that the composite-shelled roll (15) of the calender is placed as the roll forming the last nip (N) of the calender roll stack (10).

14. A calender according to any one of preceding claims, characterised in that the composite-shelled roll (15) of the calender is arranged as the roll forming a reversing nip (NK).

15. A calender according to any one of preceding claims, characterised in that the composite-shelled roll (15) of the calender is arranged to replace two former rolls of the roll stack when modernising the calender.

16. A calender according to claim 1 or 2, characterised in that into connection with the calender roll stack is arranged an actuator for limiting the closing movement of the nips when closing the nips from down to up.

17. A method for calendering a fibre web in a calender, in which calender (10), fibre web (W), especially paper or board web, is calendered at least in one calendering nip (N) which is formed between two rolls, one of the rolls being a heatable calender roll, i.e., a thermo roll (13), characterised in that, in the method, in the calendering nip (N) calendering the web (W), at least one of at least two rolls is a zone-controlled calender roll (15) the shell of which is flexible and of composite material, which zone-controlled roll (15) comprises a roll frame which comprises a shaft, that the relation of the weight of the shell to the roll frame is 0.1-0.025, that, in the calendering nip, loading is achieved by load shoes (14) located parallel at least in one row in the longitudinal direction of the roll arranged in connection with the shaft, that the position of the shell of the roll (15) is controllable via the loading of each load shoe (14) the speed being 400- 3,500 m/rnin.

18. A method according to claim 17, characterised in that, in the method, the web (W) is calendered in a multi-roll calender, in which to the lower position of a roll stack formed by at least two rolls is placed a zone- controlled roll (15) with a composite shell the shell of which is fixed and, to the upper position of which is placed a zone-controlled roll (15) with a composite shell the shell of which is moving.

19. A method according to claim 17 or 18, characterised in that, in the method, for loading the calender, the zones of zone-controlled rolls placeable in the upper and the lower position are pressurised by pressurising the load members (14) with a desired pressure.

20. A method according to any one of claims 17 to 19, characterised in that, in the method, the calender is modernised to a multi-roll calender so that as the calender roll (15) is arranged a zone-controlled roll (15) with a composite shell which replaces two former rolls of the roll stack.

21. A method according to any one of claims 17 to 20, characterised in that, in the method, the roll (15) of the calender is deflected with members provided in the roll and implementing deflecting for achieving clearance to the edge areas of the calendering nip to the external end areas of the web to be calendered for controlling the edge areas.

22. A method according any one of claims 17 to 21, characterised in that, in the method, the zone-controlled roll (15) with a composite shell in each calendering nip is loaded via each load shoe, whereby the cross-directional profiling of the web (W) is achieved.

23. A method according to any one of claims 17 to 22, characterised in that, in the method, the cross-directional width of the calendering nip is controlled with means deflecting the roll.

24. A method according to any one of claims 17 to 23, characterised in that, in the method, the separately controllable load members of the composite- shelled roll (15) of the calender implement longitudinal profiling so that the thickness profile of the web (W) directed via the calendering nip (N) is controlled in the cross direction of the web (W).

25. A method according to any one of claims 17 to 24, characterised in that, in the method, profiling is controlled based on the measuring results given by measuring instruments.