Nip load adjustmeng and/or locking structure for multiroll calender

Abstract

The present invention relates to a nip load adjustment and / or locking structure for a pair of calender rolls in a roll group of a multi-roll calendar and for a nip between the pair of calender rolls. The roll group comprises: at least one of rolls which are used as an upper roll and a lower roll of the calender rolls is provided with an elastic coating and as a supporting roll of a calender surface roll, at least one of intermediate roll between the upper roll and the lower roll, all the central axis of the calender rolls are parallel in the roll group and vertical to the moving direction of a breadth along horizontal direction, thus forming a calender roll nip with calender the breadth between adjacent calender rolls, the line of pressure or pressure face of the nip is parallel to the central axis of the calender rolls of the pair of calender rolls, in order to adjust the loading between at least one pair of calender rolls in the roll group, so that the nip is opened or locked at the opening position, the pair of calender rolls are provided with a nip loading adjustment and / or locking structure, and the structure acts on a bearing box of the calender rolls or acts between a bearing box support and / or loading and / or supporting arms.

Description

[0001] This application is a divisional application of an invention patent application with an application date of December 31, 2003, an application number of 200380107345.7 (international application number of PCT / FI2003 / 000997), and an invention title of "multi-roll calender". technical field [0002] The present invention relates to paper and board machines and in particular to calenders. The invention relates to a multi-roll calender comprising a plurality of sets of rolls arranged one above the other and / or adjacent to each other, wherein at least one set of rolls comprises at least three rolls and at least one other set of rolls Including at least four rolls, thereby forming at least one intermediate nip, so that some intermediate nips can be opened by means of a relief device (relief device), and in this multi-roll calender, the upper and lower rolls in each roll set The rolls are provided with a deflection-compensation device, and at least one heated roll is fixedly su...

AI Technical Summary

Problems solved by technology

[0015] In some prior art of this type of calenders, problems of roll and nip vibrations occur during operation, where, due to some height adjustable roll and load adjustable roll support and required high linearity The combined effect of the load, and / or this vibration is exacerbated by non-uniform web material

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