Calender and an arrangement for fastening rolls of a calender

A calender comprising:

• at least two successive calender nips each formed by at least two stacked rolls, wherein the calender nips are arranged so that a mutual distance between the longitudinal axes of lower rolls is smaller than a corresponding mutual distance between respective upper rolls of the nips, so that the axes of the rolls as seen from the end of the rolls forms a V-shaped angle, thereby forming an operating area between the nips for changing the rolls;
• bearing housings by means of which the rolls are stacked into roll pairs forming the calender nips;
• means for mounting the bearing housings of the rolls pairs to each other,
• wherein connections from at least the upper rolls to electrical, fluid, compressed air and other systems are so dimensioned that the upper rolls can be moved vertically without a need for dismantling the connections by a distance required for a change of the lower roll;
• and
• an intervening unit positioned between the calender nips and comprising at least one of a roll, a measurement equipment, and another web handling device, the intervening unit being positioned in a space where a roll is moved when a roll is changed, the intervening unit being mounted on the calender frame in a detachable manner and having connections thereto dimensioned so that the intervening unit can be lowered below the level of the lower rolls without dismantling connections to the intervening unit.

A calender comprising:

• at least two successive calender nips each formed by at least two stacked rolls, wherein the calender nips are arranged so that a mutual distance between the longitudinal axes of lower rolls is smaller than a corresponding mutual distance between respective upper rolls of the nips, so that the axes of the rolls as seen from the end of the rolls forms a V-shaped angle, thereby forming an operating area between the nips for changing the rolls;
• bearing housings by means of which the rolls are stacked into roll pairs forming the calender nips;
• means for mounting the bearing housings of the rolls pairs to each other;
• at least two frames on which said bearing housings of said rolls are mounted, and means mounted on at least one of said frames for, during a change of one of the lower rolls, supporting the bearing housings of the respective upper roll at a level higher than their normal operating position,
• wherein connections from at least the upper rolls to electrical, fluid, compressed air and other systems are so dimensioned that the upper rolls can be moved vertically without a need for dismantling the connections by a distance required for a change of the lower roll;
• and
• an intervening unit positioned between the calender nips and comprising at least one of a roll, a measurement equipment, and another web handling device, the intervening unit being positioned in a space where a roll is moved when a roll is changed, the intervening unit being mounted on the calender frame in a detachable manner and having connections thereto dimensioned so that the intervening unit can be lowered below the level of the lower rolls without dismantling connections to the intervening unit.

A calender comprising:

• at least two successive calender nips each formed by at least two stacked rolls, wherein the calender nips are arranged so that a mutual distance between the longitudinal axes of lower rolls is smaller than a corresponding mutual distance between respective upper rolls of the nips, so that the axes of the rolls as seen from the end of the rolls forms a V-shaped angle, thereby forming an operating area between the nips for changing the rolls;
• bearing housings by means of which the rolls are stacked into roll pairs forming the calender nips;
• means for mounting the bearing housings of the rolls pairs to each other,
• wherein said means for mounting said bearing housings comprises pull rods having locking means adapted thereon so that at an operating temperature a distance between proximal edges of said locking means is shorter than the distance between outer edge surfaces of mounting holes formed in two superimposed bearing housings, and so that when said pull rods are heated the distance between said proximal edges of said locking means becomes larger than said distance between said outer edge surfaces of said mounting holes.