EP0972880A2 - Calender for paper webs or similar material - Google Patents

Abstract

The calender assembly, to process a web of paper and similar materials, has rollers with an adjustable bend, and all the bending rollers (4,8,9,13) are a lifting mantle type on carriers fixed to the frame. The uppermost intermediate rollers (5,10) in each roller stack are fixed to the frame. The lower roller (8) of the first roller stack (2) in the calendar assembly and the upper roller (9) of the second roller stack (3) are next to each other, and can form an additional closing nip (34) through the lifting mantle action. The roller bending adjustment system has a support row which can be moved by 180 degrees by a setting unit (22) with a lifting guide. The second and third intermediate rollers (6,7,11,12) in each roller stack are mounted on levers (27) which pivot on axes fitted to the machine frame. In both stacks of rollers (2,3), the upper rollers (4,9) and the center intermediate rollers (6,11) and the lower rollers (8,13) have elastic mantle claddings. The other rollers (5,7,10,12) are heated rollers with hard mantles. The entry feed unit (45) directs the web through all the nips (25-33) in both roller stacks (2,3) and the additional nip (34). All the rollers (4-13) in both roller stacks (2,3) have their own drives (46). The calender rollers lie on a common plane (E) at an angle of 45 degrees to the horizontal, on columns (16) supported at the top and bottom on mounting surfaces (35,36) formed by the concrete foundation sections (40,41). The calender rollers are on the upper side of the columns (16), and at least one roller can be moved by a setting unit (49) at right angles to the roller plane (E). The bearing mounting for the carrier of at least one roller with an adjustable bend has an eccentric, which can reduce the gap between adjacent adjustable bend rollers (8,9). The eccentric is rotated with the carrier by the setting unit (22). The calender assembly is located between the final drying cylinder (42) and the web winding station (43), and at their levels.

Description

The invention relates to a calender for webs made of paper or similar material with two at one Stand arranged in a common plane Roll stacks, each a top roller, a bottom roller and have three intermediate rollers, the top roller and the lower roller each as a deflection adjusting roller with a deflection adjustment device jacket supported on a non-rotatable support are trained.

In a known calender of this type (DE 196 33 671 A1) there are two roll stacks of five rolls each, the one above the other in a common vertical plane are arranged and one after the other from the paper web be run through. The top roller is on the stand fixed, while the lower roller on one Carriage is attached by a hydraulic cylinder shifted and loaded in the direction of the roll stack can be. The jackets of the deflection adjustment rollers are therefore at their ends on the associated Carriers stored while the carriers are stationary Stand or held on the sled. Every change the load leads to a change in the compressive stress in all nips of the roll stack.

Deflection adjusting rollers are known from DE 30 04 913 C2 of the jacket lift type as the top and bottom roller of a roller stack known. But here is the coat in operation who ran one end roller up to a stop, so that the position of the jacket fixed relative to the stand is.

The invention has for its object a calender of the kind described at the beginning, that he's used to produce a variety of different Paper quality is suitable.

This object is achieved in that all jacket lift type and their carriers are mounted so that they are uppermost Intermediate rolls are stably mounted that the lower roll of the first roll stack and the top roll of the second roller stack are adjacent to each other and one additional nip that can be closed using the jacket stroke can form, and that the direction of action of Deflection adjustment device optionally to the associated Roll stack or to the other roll stack has.

With this configuration there is in every roll stack two areas, namely the top nip on the one hand and the other nips, on the other hand, a total of four areas, in which there are independent compressive stresses practically over the entire line load range let set. Already in the top nip can be worked with maximum compressive stress, which the Satination effect significantly improved. Add to that the Possibility to treat the paper web in the additional nip, for example to achieve a satin finish if the deflection adjustment rollers involved have an elastic Wear cover. You can also use the additional nip if on the other rolls of the roll stack one Repair or a change must be made. The top and Bottom rollers bring the load from both ends in approximately the same way on the roll stack. Man only needs one reserve roller for all four end rollers.

It is recommended that the deflection adjustment device consists of a row of support elements that together with a stroke guide by means of an adjusting device is displaceable by an angle of 180 °. By simple actuation of the adjusting device becomes the desired one Direction of action reached. In the simplest case becomes the entire support on which the support elements and the stroke guide are attached, rotated by 180 °.

It is also favorable that the second and third intermediate roller each roll stack is mounted on levers, that swivel around fixed swivel axes. These intermediate rolls can therefore change with little friction follow the load from the lower rollers. By lowering the lower roller, those below open of the top nip located nips automatically.

In a preferred embodiment, it is ensured that that in each roll stack the top roll, the middle intermediate roller and the lower roller an elastic Wear cover and the remaining intermediate rollers are heated hard rollers. This allows in each of the two roll stacks one or the other the two sides of the web in all nips on a heated hard roller and therefore largely on both sides to get evenly satined paper.

Furthermore, it is recommended that a feed device to insert the web through all nips of the two roll stack and the additional nip is provided. With just a single feeder, therefore all nips supplied, of which only those are effective are, which due to the burden of Deflection adjustment devices are closed. The open column, on the other hand, allows the train to go unhindered through it.

All rollers of the two roller stacks expediently have own drive. This supports the Passing the web through the opened nips.

The calender is also suitable for online operation. The rollers' own drive enables one flawless insertion of the at high speed incoming paper web. When breaks because of the repair or replacement of a roller may be required the paper web is still treated in the additional nip, making usable paper of a different quality arises, but the amount of paper returned to the pulper can be kept small.

Furthermore, it is recommended that the common level runs obliquely to the horizontal and that the approximately parallel to this stand both below as well as supported above. Through the inclination is the prerequisite created for the stand to support two places. Thanks to the double support there is a largely vibration-free stand. The height is less than that of a vertical stand with ten rollers arranged one above the other. The length is shorter than two vertical 5-roll calenders, which are arranged one behind the other. The roll change simplified because a crane can attack better than with a vertical roll stack. Therefore is a Roller change also possible during operation, whereby only the section in which the one to be replaced Roller is ineffective by opening the nips must be done.

It is advantageous that the stand both below as well as supported on top of building-fixed storage areas is. In this way the forces are dissipated well.

It is advantageous that the storage areas are covered by concrete foundations are formed. Such concrete columns are less expensive and easier to manufacture than corresponding ones Support rods on the stand.

The most favorable values (small height, short length) result itself when the common plane is at about an angle runs from 45 ° to the horizontal.

It is recommended that the rollers on the inclined Top of the stand are arranged and at least a roller at right angles by means of an adjusting device is shiftable to the level. It is enough to roll over to drive a relatively short distance so they immediately grabbed by a crane and after can be removed at the top.

It is favorable that the bearings for the carrier at least which have a deflection adjustment eccentric, with which the distance between the neighboring ones Deflection adjustment rollers can be reduced. In order to the new principle is also applicable when the jacket stroke not enough to close the additional nip alone.

It is also advantageous that the eccentric together with the carrier can be rotated through 180 ° by the adjusting device are. It is therefore sufficient to set the Adjustment of carrier and eccentric.

The arrangement between the last drying roller of a dryer section and a winding device, that are at about the same height. Because of the slope, the track section between drying roller and calender and between calenders and winding device a relative have a gently rising course. This in turn is favorable for the introduction of the paper web in an online operation.

Fig. 1

eine schematische Seitenansicht eines erfindungsgemäß Kalanders,

Fig. 2

einen Schnitt durch den Mittelbereich einer Durchbiegungseinstellwalze,

Fig. 3

einen Schnitt durch den Endbereich einer Durchbiegungseinstellwalze und

Fig. 4

eine schematische Darstellung der Lagerung des Trägers einer Durchbiegungseinstellwalze.

The invention is described below with reference to a preferred embodiment in connection with the drawing. Show here:

Fig. 1

2 shows a schematic side view of a calender according to the invention,

Fig. 2

2 shows a section through the central region of a deflection adjustment roller,

Fig. 3

a section through the end portion of a deflection roller and

Fig. 4

is a schematic representation of the storage of the support of a deflection roll.

A calender 1 made for the treatment of webs Paper and similar material, such as cardboard has an upper 5-roll stack 2 and a lower one 5-reel stack 3 on. The upper roll stack 2 consists of the top roller 4, three intermediate rollers 5, 6 and 7 and the lower roller 8. The lower roller stack 3 consists of the top roller 9, three intermediate rollers 10, 11 and 12 and the lower roller 13.

The top and bottom rollers 4, 8, 9 and 13 are deflection adjustment rollers of the jacket lift type, which are among themselves can have the same structure, so that with one reserve roller for all four end rollers. As FIGS. 2 and 3 show, such a deflection adjustment roller has 4 a jacket 14 which over a Deflection adjustment device 15 on one in operation Supported rotatably supported on the stand 6 support 17 is. The deflection adjustment device 15 exists in the present example from a series of hydrostatic Support elements 18 in a known manner via a pressure chamber 19 each with pressure medium be supplied that the deflection adjustment 15 also serves as a loading device. To the The ends of the roller jacket 15 are on a bearing ring 20 mounted in the stroke direction on a stroke guide 21 is movable. The roller jacket 14 is therefore over its entire length is movable in the stroke direction. Moreover is still provided for the deflection adjustment rollers, that the carrier 17 with the help of an actuator 22 can be offset by an angle of 180 ° (cf. the arrow 23 in Fig. 2), so that the direction of action of Deflection adjuster 15 in the opposite Direction points as this by the dash-dotted line arranged row of support elements 18 'illustrated is.

The top intermediate rollers 5 and 10 are fixed to the stand 16 stored. If 4 and 9, the deflection adjuster 15 shown in FIG Fig. 2 has illustrated position, the paper web 24 in the first nips 25 and 26 in the direction of passage the upper roll stack 2 or the lower roll stack 3 with very high line load and therefore high Compressive stress are treated.

The intermediate rollers 6, 7, 11 and 12 are each on a lever 27 stored, about a fixed pivot axis pivots. If the deflection adjusters 15 of the lower rollers 8 and 13 the dashed in Fig. 2 Have the nips 28, 29 and 30 of the top Roll stack 2 and the nips 31, 32 and 33 of the lower one Roll stack 3 loaded accordingly. The amount of the burden is independent of that in the first Nip 25 or 26. There are therefore four sections, in which the paper web 24 is different can be treated so that a variety of different Can produce paper qualities.

Between the two roll stacks 2 and 3 remains in the Normal operation an open additional nip 34 through which the Paper web 24 runs through unhindered, with the result that in the upper roll stack 2 preferably one and lower roll stack 3 preferably the other side of the web is satined.

The upper and lower rollers 4, 8, 9 and 13 and the middle intermediate rolls 7 and 11 are elastic rolls, while the remaining intermediate rolls 5, 7, 10 and 12 are heated hard rollers. But it also comes other combinations, for example with hard top and Bottom rolls, into consideration.

The distance between the two deflection adjustment rollers 9 and 10 is so low that the additional nip 34 under Utilization of the roller stroke from, for example, 30 to 40 mm can be closed. For this it is only deflection adjusters 15 of the two end rollers 8 and 9 with the help of the adjusting device 22 towards each other and then that Supply pressure medium with the appropriate pressure. With this additional nip 34 can then be satinized be because the two bending adjustment rollers 8 and 9 wear an elastic cover. Without significant additional There is therefore another possibility paper handling.

If the opened additional nip 34 is larger and the jacket stroke 4 is not sufficient for closing, according to FIG the carrier 91 of the top roller 9 is mounted in a spherical cap 92 be in turn by an eccentric disk 93 will be carried. The latter is together with the carrier 91 by the adjusting device 22 through 180 ° in the bearing 94. In this way, the open additional nip 34 can be opened For example, 80 mm can be held, which is also an opening the nips 28 and 29 relieved.

The axes of the rollers 4 to 13 lie approximately in a common one Level E, which is opposite to the horizontal Is inclined at 45 °. Accordingly, the stand has 16 an oblique course. It can therefore be in two places are supported, namely with a lower support surface 35 on a building-fixed bearing surface 36 and with an upper bearing surface 37 on an upper building-fixed Storage area 38. The storage area 37 is located itself on a foot 39, the stand 16 near it upper end is attached. The bearing surfaces 36 and 38 run horizontally and are each on a concrete foundation or base 40 or 41 formed. This is the stand 16 largely insensitive to vibrations. The stand 16 can be less stable than so far and therefore cheaper to manufacture.

The calender 1 can work online. He is between the last drying roller 42 Drying section of a paper machine and a winding device 43, for example a slitter and Winding device. Drying roller and winding device are at about the same height and above one Working level 44, which is penetrated by the calender 1. Therefore, the paper web 24 has between the drying roller 42 and the entrance of the calender 1 and between the Exit of the calender 1 and the winding device 43 a relatively weakly increasing course. This makes it easier to insert the paper web in online mode. The same advantage arises when the paper web from the drying roller 42 down into the Calender 1 is inserted and the top of the winding device 43 exits.

An only indicated web feeding device 45, the works with rope clamping, for example Start of path through all nips 25 to 33 of the two Roll stack 2 and 3 and the additional nip 34. It is sufficient hence an insertion process for both roll stacks. The Introductory movement is supported by the fact that all Rolling the calender and also the associated guide rolls each have their own drive 46. The paper treatment depends on which one of the mentioned nips are closed. Drawn in dashed lines is a second web insertion device 47, with which only the additional gap 34 is supplied. At The matt satinage of a web introduced in this way exists Possibility of repairs on the other rollers or a To make a replacement. Semimatt operation results for example, if only the top one Nip 25 is used.

The exact inclination of the stand 16 depends on the local conditions. Values ranging from 45 ° deviate by about 10 ° above or below still belong in the preferred range.

The inclination with the roller stacks arranged above has the further advantage that the rollers Substitution are more accessible and for example removed with a crane 48 and corresponding crane control and can be used. In particular can the bearings of the roller to be replaced by means of a hydraulic actuator 49 along a guide be pulled out perpendicular to plane E, like this is shown in dashed lines in Fig. 1. As an actuator 49 comes primarily the piston of one along the lever 27 extending hydraulic cylinder in Consideration. In the external position, the crane 48 can Hold the roller ends immediately and the roller vertically dissipate.

Claims (15)

Calender for a sheet of paper or the like Material with two attached to a stand in one Level stack of rollers, each one Top roller, one bottom roller and three intermediate rollers have, the upper roller and the lower roller each as a deflection adjustment roller with over one Deflection adjustment device on a rotationally fixed held support supported mantle formed are characterized in that all Deflection adjusting rollers (4, 8, 9, 13) of the jacket lift type and their supports (17) are mounted on a stand are that the top intermediate rollers (5, 10) are fixed to the stand such that the lower roller (8) of the first roll stack (2) and the upper roll (9) of the second roll stack (3) adjacent to each other are and taking advantage of the coat stroke closable additional nip (34) can form, and that the direction of action of the deflection adjusting device (15) optionally for the associated roll stack or to the other roller stack. Calender according to claim 1, characterized in that the deflection adjustment device (15) a row of support elements (18), which together with a stroke guide (21) by means of an adjusting device (22) can be offset by an angle of 180 ° is. Calender according to claim 1 or 2, characterized in that the second and third intermediate roller (6,7, 11, 12) of each roll stack on levers (27) are stored around fixed pivot axes swing. Calender according to one of claims 1 to 3, characterized characterized in that in each roll stack (2, 3) the top roller (4, 9), the middle intermediate roller (6, 11) and the lower roller (8, 13) an elastic Wear cover and the remaining intermediate rollers (5, 7, 10, 12) are heated hard rollers. Calender according to one of claims 1 to 4, characterized characterized in that a feed device (45) for inserting the web through all nips (25 to 33) the two roller stacks (2, 3) and the additional nip (34) is provided. Calender according to one of claims 1 to 5, characterized characterized in that all rollers (4 to 13) of the two Roll stack (2, 3) own drive (46) have. Calender according to one of claims 1 to 6 through an online operation. Calender according to one of claims 1 to 7, characterized characterized in that the common plane (E) slants to the horizontal and that it is about parallel stand (16) both is supported both below and above. Calender according to claim 8, characterized in that the stand (16) on both the bottom and the top building-fixed bearing surfaces (36, 38) is supported. Calender according to claim 9, characterized in that the bearing surfaces (36, 38) through concrete foundations are formed. Calender according to one of claims 8 to 10, characterized characterized in that the common level (E) is about runs at an angle of 45 ° to the horizontal. Calender according to one of claims 8 to 11, characterized characterized in that the rollers on the oblique Top of the stand (16) are arranged and at least one roller (6) by means of an adjusting device (49) can be moved at right angles to level (E) is. Calender according to one of claims 1 to 12, characterized characterized in that the bearing (94) for the carrier (91) at least one deflection adjustment roller (9) have eccentrics (93) with which the distance between the adjacent deflection adjustment rollers (8, 9) can be reduced. Calender according to claim 13, characterized in that the eccentric (93) together with the carrier (91) can be rotated through 180 ° by the adjusting device (22) are. Calender according to one of claims 8 to 14, characterized by the arrangement between the last one Drying roller (42) one drying section and one Winding device (43), which is approximately the same Height.

Images