FI117675B - Multiple choice Calendar - Google Patents

Description

117675

The present invention relates to paper and board machines or similar fiber web machines, in particular to multi-roll calenders. The invention relates to a multi-roll calender according to the preamble of claim 1.

FIELD OF THE INVENTION FIELD OF THE INVENTION relates to a multi-roll calender with overlapping and / or parallel roll stacks. The prior art is also disclosed in FI 20030003, in which the invention relates to a method for calendering a fibrous web in a calender comprising at least two roll stacks, and in which the invention also relates to a calender. Reference may also be made, in the prior art, to DE-A-196 31 056, which discloses a calender in which movable rolls are arranged at the lower and upper ends of the track. However, the problem with this known arrangement is that when the fiber web is changed, it is necessary to take a new route, which slows down the changeover. Also, this known arrangement does not allow the use of multiple nips for matte grades.

• Calendering generally aims to improve properties such as smoothness, glossiness, and oil adsorption of web-like material such as paper or board. * thio ability. In calendering, the web is guided to a nipple formed between the rolls to be • pressed against each other, i.e. a calendering nip, in which the web is deformed by temperature, humidity and nip pressure. In the calendar, nips are formed • · Φ • · · φ. ···. . A smooth-surfaced press roll such as metal roll, and a resilient coating of the coating φ φ φ "tetyn roll, such as a polymer, between the elastic surface roll adapts the web φ Φ · • φ φ 1.1 surface thereof and to press the web opposing evenly against the smooth-surfaced pressing, • · In this context, calender rolls refer to rolls forming a calendering nipple, top roll means the top roll of the roll stack, top nipple means the top calender nipple formed between the top roll and the bottom roll of the roll roll, i 117675 lower roll roller and lower nipper means the lowest calender nip of the roll stack formed between the lower roller and the calender roll above the lower roller.

5

Typically, compression is accomplished in a multi-roll calender by securing the top or bottom roll of the roll stack and squeezing the stack of rolls against a fixed roll, which may be a top roll, a lower roll, or any of some of the spacers. Alternatively, both the upper and lower rollers are pressed against each other 10 either so that none of the intermediate rolls are locked in place or at least one of the intermediate rolls is locked in place. The deflections of the rolls can generally be compensated by deflection compensating devices in the upper and lower rolls, for example, so that the roll nipples take a straight line shape.

15 Calendering technology is increasingly switching to on-line calendering as the speeds required by paper machines increase. Multi-nip on-line calendering is calendering in a calender unit where nips are alternately formed between successive smooth-surface press rolls, such as a metal roll, and a roll coated with a flexible coating, such as a polymer roll. in calendars from the upper nip to the lower nipple due to the tensile strength of the ground • · · • · · *, unless roller relief systems are used. Downwardly rising 5 • * · · · · ·. to eliminate traction, control the roll deflection line, and also for quick opening of the roller · current multi-nip calendars use a roller • and * * ground compensating roller roller. 25 nips. Such a roller lightening system is used under the applicant's trademarks • · ··· ·. ···. OptiLoad and TwinLine in the well-known multi-roll calendars, I. * The modern calender sets high demands on the calender's melting capacity. Several grades of paper require different ways to load. · «· · 30 ensures calender roll stacking and various calendering methods, which has facilitated the introduction of various load adjustable nipples and various types of roll coatings 3 117675 into the calenders. In calendering, high temperature and high line pressure 5 contribute to high gloss in the final product.

At present, a calender is required to have a structure which enables rapid species conversion by directing the web to pass between the calendering nipples required by the web type. It has been problematic to rapidly change the paper web calendering method for papermaking, for example in the case where the same base paper can be used to produce uncoated and coated paper types, such as uncoated newsprint or newsprint or matte coated paper.

Partial nip driving in this specification means a driving method in which at least one nip of the roll roll stack of a multi-roll calender is an open nip, i. E.

· * · • · ♦ · * · *: 4; : The multi-roll calender currently requires a calendering process of * 20 nibs in one or more nip positions to produce multiple paper types and a variety of paper grades, such as high-caliber paper, with only one roll stack. · .. · polished shiny grades and matte and silk grades. The human eye sees paper as matte when the gloss of the paper is less than 35% Hunter gloss%. Typically, when matting • * • »·: ··: 25, the number of calendering nips is small and the calendering temperature •« * ·· ** is low. On the other hand, soft calendering for the production of matte quality is- »* *. In V line soft calender equipped with a nipple with two soft rollers on one hand *** ··:.

off-line supercalendering, in which the fibrous web is led to a nip formed by soft rolls using a special web entry where any number of nips are bypassed - *: **: 30.

117675

Prior art multi roller calenders with lightening webs have not provided a method for implementing a matte nip on a roller, i.e., a nip with two soft plated rolls facing each other and achieving sufficiently high line loads. This problem has been solved by dimensioning the calender intermediate rollers to oversize, allowing the line load to be raised to matt grades. Intermediate roller oversizing has not achieved sufficiently high line load levels because of the insufficient strength of the roller suspension solutions used and the higher friction caused by growing masses reducing the accuracy of the roller reduction adjustment, and the cost of rolling rolls has been increased by 10 larger diameters. In addition, the suitability of a nip with a variable hard and soft nip for blade-coated paper grades has been poor due to the risk of spotting. In addition, current matt nip strings have tied spare rollers as an integral part of the machine, resulting in reduced machine serviceability and efficiency, and slower roll replacement, for example, when having to replace 15 deflection compensated (tk) roll shells over a fixed spare roll. In addition, known separate mat nip arrangements have required their own use on spare rolls, which has resulted in high investment and operating costs for known solutions. Some of the known solutions also consider the use of pre-calender spare rolls as replacements • · *: · '· rolls with a multi roll calender, but these have not been interchangeable • · * 20 matte nipples as the attachment head may be different or required - * "*: a rolled-up roller or a roller diameter difference has not allowed interchangeability. In prior art two * roller calendars known from the prior art, the use of a matte nip in spaces where a matte nip is formed between two separate rolls, rolls (2pcs) have been involved in calendering and other • ·: 25 parts of the track could not be utilized, prevented the use of both separate track • • · • · *. ·. ! t in the roll calendars could not be utilized for the mattan nip because tk rolls and thermo-* * * ϊ.,. ϊ lats are not o have been secured or interchangeable with, for example, a pre-calender thermo roll, for example, to provide a 30/1 hard / soft nip for heating the calender.

5, 117675

It is an object of the present invention to provide a calender in which the problems and drawbacks of the prior art methods and calendars discussed above are eliminated or at least minimized.

It is a further object of the present invention to enable calendering of a plurality of fiber web types and of different grades of these types of fiber web, in particular both highly calendered high gloss grades and matt and silk grades.

These objects have been achieved by the multi-roll calender mentioned above, the specific features of which are set forth in the characterizing part of the appended independent claim 1.

For other aspects of the invention, reference is made to dependent claims 2 to 11 of the appended claim 15.

In the multi-roll calender according to the invention, partial nip *** can be used as the driving mode. running one or more nip positions. Preferably, the nip positions are * * *: upper and lower nip positions, but partial nip positioning can also be accomplished at intermediate nipples * · * 20 within the limits allowed by the roll stiffness. Loading of calender rolls and *: **: stiffnesses, i.e., outer diameter and inner diameter of calender rolls, and * material are adjusted such that deflections due to the weight of rolls and roller auxiliaries and the loading of rolls do not result in transverse nip load profile, deflection compensated) profiling: 25 months ± 0.5 kW / m.

• · · • * • · • · ·.

::: In the upper position, the intermediate roll (s) are loaded with their bearings and support and load arms * ·· ϊ.,. Ss against a fixed or movable diaphragm compensated top roll or other sufficiently rigid top roll.

• * 30 6 117675

In the lower position, in turn, the loading of a nip formed by one intermediate roller and the lower roller is generated by loading the deflection compensated lower roller with lower cylinders against the upper intermediate roller. In the lower position, the load on the nip formed by the plurality of intermediate rolls and the lower roller is generated by measuring the deflection compensated lower roller load 5 with the lower cylinders against the upper intermediate roller. From the intermediate roll rolled in the lower roll, the load is still transmitted to the intermediate roll above it if there are two nipples in the lower position. Since the lower position typically requires a nip load greater than that caused by the mass of the intermediate roll (s) and auxiliaries, the upper intermediate roll can be locked by its support and loading arms relative to the calender body 10. When loading the lower roller with the intermediate roll (s) to close the nipples, the weights of the intermediate rollers and the auxiliary roller auxiliaries are taken into account when determining the load level.

The multi-roll calender can produce many different types of fiber webs and different grades of these types of fiber webs, such as both glossy paper grades and matte and silk grades. Types of fiber webs may include: News, SC, MFC, LWC and WFC.

• · · • »• · • · ·; According to the invention, a caliper is provided in connection with the calender to which the matt nip rolls are fastened. Preferably, the rolls to be attached are calender spacer rolls or *: · *: deflection compensated rolls. The auxiliary body is secured to the calender body by a lever #t * {* mechanism, a guide mechanism, a fixed arrangement or the like. Apurun-

III

The gate and the upper or lower roller, or both, have at least one loading cylinder for loading the roll nipple in a matte run. Calendars • ·: 25 glossy grades have no nipple contact between the rollers attached to the subframe, and the nipple contact prevention is achieved by a fixed, removable, or adjustable •>: snack positioned between the roll axes. For calendering glossy grades, the subframe can be lifted by a cylinder or similar actuator when closing the rack and at least one load cage arranged alongside the subframe rolls can be utilized to provide nip load. According to a preferred embodiment of 7117675, the upper track is closed by a cylinder and a line load is created into the upper track by a second cylinder.

By means of the invention, a nip or matte nip of two polymer-coated rolls, i.e. a soft roll, can be provided in the roll, i.e. roll, stack of a multi-roll calender, for example using deflection compensated rolls or shoe rolls as a counter roll or a polymer coated tubular roll. By means of the track suspension implemented by means of an auxiliary frame used in connection with the invention, a rapid change of the driving mode from the entire track to the matt driving is achieved. The roller suspension 10 used in connection with the invention allows higher line loads for matt grades than previously known roller hangers, and the invention does not require the reel rolls of the multi roller calender to be oversized due to the one-sided load applied to the matte -15 lan to bend so that the line load is even across the width of the nip.

By means of the roller suspension according to the invention, the idle loads of the overlapping rollers can be varied independently of each other, and when matte calendering the ruler load forces are not transmitted to the calender body because the subframe 20 forms a closed force mat between the rollers.

• · · · · * ·

According to the invention, the roller suspension consists of a subframe to which it is attached

• M

mattanip rollers. Preferably, the rolls to be mounted are calender spacer rolls or deflection compensated rolls. The subframe is preferably attached to a conductor mechanism * · φ ϊ.ϊ: 25 calender body. According to a preferred embodiment, the upper roller is closed by a sinker and a line load is created on the upper roller by a second cylinder. The lower · · ϊ, ί.ί man track load is created with a third cylinder.

* · * • · • · · *

In a preferred embodiment of the invention, a matte nip can be implemented in the multi-roll calender using only one spare roll of the calender. The invention provides for a situation in which one of the two 117675 spare rollers within the scope of delivery of a conventional calender is utilized for a matt drive arrangement and the other spare roll for maintenance or storage. The invention also makes it possible to change the intermediate rolls and the upper roll during the matte run. The invention can also be used to reduce the number of guide rolls required for a matt driving mode compared to prior art solutions. The invention also allows hard / soft nipples to be used on the top of the track when changing the mattip rolls on the bottom of the track. By means of the invention, the investment costs and energy consumption of the mat drive can be reduced by omitting one high-power line drive, for example in the matt surface solution (cf. FI20000076U) 2 spare rolls (pc rolls) are hung before the calender and both rolls must be used. In connection with the invention, a second use of the actual track can be utilized in the mat tip and only one use can be added to the return roll.

An arrangement according to one embodiment of the invention consists of a deflection compensated roll acting as a lower roll of the calender, which is attached to the subframe.

A calender roller is also mounted on the same subframe. The calender top roll is interchangeable with the bottom roll and / or spare roll. The subframe is attached to the · ***. rails on the frame and are movable on the load cylinder while driving the «« «: · * · track. Of the rolls attached to the subframe, the lower roll may be fixed and the spare roller move relative to the subframe or vice versa. In matte driving, the nipple is closed by removing *: ··; snack and moving the spare roller up the cylinder or the lower roller down the cylinder depending on which roll is fixed. For all-wheel-drive when lowering • • · · ...! there is a snack between the wheel to prevent nipple contact and stiffen the structure. The entire track is closed in a manner known per se with a load cylinder. Full Tracks: With 25 runs, the spare roller can be removed for service if needed and replaced with a new snack. The number of ::: rollers used to guide the track is determined by the height of the machine.

• · · • · • · * · *.

; * · *. With one embodiment of the invention, · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · 30 nip for matt and news grades. By means of the invention it is possible to provide a low / high nipple 9117675 hard / soft nipple or, alternatively, a cooling cylinder with or without nip contact, which enables high line loads and high temperatures, depending on the position of the center of the deflection compensated roll. By means of a roller arrangement having a cooling cylinder which enables the invention, the calendered track can be cooled after the roller, thereby lowering the winding temperature. The roll arrangement of the mat nip 5 can be implemented by using a precalender spare thermal roll as a hard surface roll, whereby the total number of rolls in the delivery remains the same as in the current deliveries.

An arrangement according to one embodiment of the invention consists of a subframe 10 to which are matted pin rollers. The upper roll may be a deflection roll of a multi-roll calender or a thermo roll of a (pre-calender) or a cooling cylinder and the lower roll may be a spare roll of a pre-calender or a deflected roll of a roll roll calender or its own roll. The lower roll can be heated using it as a normal thermal roll or it can be cooled 15 when used as a cooling cylinder. The subframe can be fitted with auxiliary rollers for various track options, including the multi roll calender roller skip and use only the mat nipple when cold or hot or the track passes through the track. through, but guided by roller to matte nipple at end of roller, allowing ··· • use of upper roller nipples, but using lowered matte nipple or track 20 passes through roller to guide roller to operate coolant cylinder: ··; around the thermal roller, whereby the track passes through the entire track *: * in a previously known manner without passing through the matt nip.

··· • »• Φ« ··

With the aid of an exemplary embodiment of the invention, a multi-roll calender can be used to provide • 25 hard / soft or soft / soft nips for matte and news grades. The invention allows high line loads and high heat to be tracked at the top of the track. A: Hard / soft nipple for dusty conditions or alternatively a cooling cylinder with or without nip contact, depending on driving mode. By providing a roller arrangement having a cooling cylinder, the invention enables the uncalendered path to be cooled, and to lower the temperature of the web with both coated and uncoated paper, thereby increasing the temperature gradient in the nip. 117675 ι ° can be implemented with a matte nip roller that uses a precalender spare thermal roll as a hard surface roll, so that the total number of rolls in the delivery remains the same as in the current delivery. A preferred embodiment of the invention consists of matt nip rolls mounted on a subframe. The upper roll is the pre-calender spare thermal roll, the multi roll calender hard or soft surface deflection compensated roll, and the lower roll is the multi roll calender deflection roll. The subframe is fixed to the calendar frame. The upper roll can be heated by using it as a normal thermal roll 10 or it can be cooled by using a roll as a cooling cylinder. The calender can be fitted with auxiliary rollers for different track options, including the use of a mat nipple when cold or hot. The track may pass through the entire roller, or the track may be cooled and the track run around the top roll, whereby a nip contact may be provided between the rolls or the rolls are separated depending on the direction of the deflection compensated roll load shoes. If there is no nip contact between the rolls, the entire roll of the multi roll calender can be used. The nipple contact of the mat nip can be accomplished by cylinders and by removing the removable snack between the axes of the rolls or by using a sheath moving in a deflection compensated roll • I *.

20 • ·

In a preferred embodiment of the invention, one or two soft / soft ·· ♦ mat nips or soft / hard mat nips with high line loads can be provided in a multi-roll calender consisting of two separate rolls. The invention also allows the operation of a two-roll multi-roll calender, such as several types of soft-calipers, such as single or double-nip soft calenders. The invention provides a more cost-effective way to control the one-sidedness of matt grades in comparison to earlier matte nipple designs. The matte nip roller arrangement can be accomplished by using a * reel roll or a pre-calender roller for the multi-roll calender; * · *; spare roll. The invention also achieves a high capacity on the calendar with optional track gaps. By means of the invention it is possible, for example, to calender the matte grades by bypassing the rollers or rollers and at the same time to replace the rolls of an unused roller. The auxiliary is located at the bottom of the first, second, or both Telas. One of the rolls attached to the subframe is a deflection compensated roll of the multi-roll calender, which may also have a diaper load. The counter roll may be a deflection compensated roll of a multi-roll calender, a spare roll of a pre-calender, or its own roll or shoe roll sized at this 5 position. The stiffness of the roll and the counter roll in the auxiliary frame can be changed. The subframe is secured to the calender body by a guide mechanism or a hinge mechanism. The counter roll can be heated by using it as a standard thermo roll in a hard / soft nip, or it can also be cooled by using the roll as a cooling cylinder. Auxiliary rollers 10 may be attached to the subframe, which may also be movable for different track options. The tracks can be closed by cylinder independently of each other when using the entire track. In the mat nip drive, the nip contact between the rolls is obtained by loading the diapers of the movable jacket roll or by removing the snack between the axes of the rolls and using the cylinders. The performance of the matt nipples on the tracks can be up to 15 tonnes. The tracks can be partially or completely bypassed by the guide rollers.

The invention will now be described with reference to the accompanying drawings, without, however, limiting the invention to those shown in the drawings.

Figures 1 and 2 show a multi-roll calender comprising only one roll stack if the fiber web passes through all of the calendering nipples.

• · · · · · · · ·

Figures 3, 4 and 5 show a multi-roll calender comprising only one roll stack in which the fibrous web passes through five calendering nips.

;. ··· 25 • * ·

Figure 6 shows the line loading level graphs of the closed nip of the roll stack.

k • k • · * ♦ · * · • k *! Figures 7-12 illustrate preferred embodiments of the invention in the calender. * 5 *. - for use in track suspension arrangements.

··· * # 30 • · 12 117675

When the rollers are movable relative to one another in a multi-roll calender, the calendar can be driven in part nip and more traditional full nip mode. The multi-roll calendars of Figures 1-5 are illustrated in a partial nip run. The top roll of the multi-roll calender may be either fixed or fixed with respect to the body F and provided with a movable diaper. In the Monite-5 lacquer calendars 100, 200, all intermediate rollers and the lower roller are movable. The lower rollers 20 are movable and loadable by the loading cylinders 22 from below. The mobility of the lower recesses 20 is illustrated by a vertical double-headed arrow symbol. The frame F of the multi-roll calenders 100, 200 has bearing brackets and load arms 24 with loading devices 23, such as those used in the multi-roll calenders known under the trade names OptiLoad and TwinLine. The loading devices 23 are mounted between the lever brackets and the loading arms 24 and the body F. Intermediate rollers 12-19 are bearing at their end regions on support and load arms 24. The support and load arms 24 and the load devices 23 are each shown for purposes of clarity only for purposes of explanation.

15

The multi-roll calenders of Figures 1-5 are provided with ten calender rolls, but the number of calender rolls may be 3-14, preferably 8-14, for example eight. ***. nine or twelve. For calendering the fiber web, the multi-roll calender has • · ·:: * · only one roll stack comprising two or more calendering nips. In the patterned 1-5 multi roll roll calipers, the nips are alternately formed between the following roll rolls, such as a metal roll, and a roll coated with a flexible coating, such as a polymer roll. The upper roller 11, 1Γ and the lower roller 20 are preferably rolls coated with a flexible coating. In Figures 1-5, the number of rolls in the roll roll stack of the multi-roll calender is even, whereby the middle soft-surface intermediate rolls form an intermediate nip between them.

»· • *: A: In this specification, partial nip driving is a driving mode in which at least one nip of roll stack 100, 200 is open, i.e., a non-calendered nip of fibrous web W, and at least one nip is calendering a fibrous web.

• · 30 13 117675

In partial nip driving, the web entry of the fiber web W may be complete as in Figures 1 and 2, in which the fiber web W is guided through all the nipples of the calender 100 roll stack. In Figures 1 and 2, at least one nip serves as a closed nip, i.e. a calendering calendering nip. In Figure 1, two nipples are closed, namely the upper nip 15 and the intermediate nip 2 below the upper nip. In Figure 2, one nip is closed, namely the top intermediate nip 2.

In a partial nip drive, a preferred track web entry for the fibrous web comprises passing the fibrous web through all the nipples in the roll stack, whereby the driving pattern can be easily changed from 10 partial nip drives to full nip driving without the need for a new threading.

In the calender, the fibrous web is calendered with a full nip drive when the fibrous web web entry comprises passing the fibrous web through all the nipples of the roll stack and all the nipples of the calender roll stack are closed.

15 '

Another preferred way of implementing a partial nip run is to provide at least one ·· ** in the roll roll stack 10, 101 of the multi-roll calender 100, 200 both above and below. closed nipple, which can influence one-sided quality properties of fiber web W such as gloss, smoothness and oil absorption.

· «· 20 • · *: ··: In rolls 10, 4> * j * 101 of Figures 1-5 with ten calender rolls having a top roll 11, 1Γ having a soft surface and alternating between soft roll and hard surface roll rolls in the roll stack from top to bottom the lower roll 20 is soft-surface and the soft-roll and hard-surface • ·: 25 calender rolls alternate in the roll stack from the bottom up, the shift nipple 5 is in the middle of the roll stack. The soft intermediate rolls 15 and 16 form the interchangeable nip 5 between them.

S sekä "ϊ With the track extensions shown in Figures 1-5, both the upper side Y and the lower * *« side A of the fibrous web W can be calendered, if desired, by a partial nip run, for example, in one nip above shifting nip 5 and preferably in the desired manner for one-sided quality properties of the fibrous web W such as gloss, smoothness and oil absorption.

: 14 117675 ί \ • „'i

In the multi-roll calender 100 shown in Figures 1 and 2, the upper roll 11 is fixed relative to the calender F and is provided with a movable diaper. Naturally, the multi-roll calender stolen by the complete web extension of the fibrous web W of Figs. 1 and 2 may also comprise, in the method of the invention, an upper roll with a calender body F fixed but not movable.

In the multi-roll calender 100 of Figure 1, which comprises only one roll stack 10, the fiber web W passes through the difference intinipots of all of the fish in the roll stack. The roll stack 10 has 10 overlapping ten calender rolls 11-20. In calendering, the fiber web W is led to a calendering nip formed between the rolls to be pressed against each other or to the calendering nips formed between the rolls to be pressed against each other, which are provided in the roll stack 10 of FIG. In the partial nip run, at least one nip 15 of the calendering nipples 1-9 is open, i. The nipples can be closed and opened. Out of the rolls not participating in Nipples 1-9, take-out rolls 21 are shown.

• · ·

The upper nipple 1 is formed by the upper roll 11, in this case a roll coated with a flexible coating 20, preferably a polymer-coated roll, and the upper intermediate roll 12 12. Which is a smooth surface press roll, preferably an upper thermal roll. The top roll 11 is' * in Figures 1 and 2 a movable shell preferably a deflection compensated roll. Ylät roll »t · * ··; The mobility of the 11 diapers is depicted by a vertical double-headed arrow symbol »» * ···. Any other sufficiently rigid upper roll which has not been stolen by deflection compensation equipment may also be considered.

• ♦ * · • ♦ «« «« «

In this context, the sufficient rigidity referred to herein means the property required of the upper roller 12, or the intermediate rollers 12 below the upper roller 11, which are partially loaded in the direction of the upper roller during partial nip driving, * · · · 30 is not capable of causing 11 deflections in the upper roller that would result in ♦ cross nipple loading protrusion error. Thus, the upper roll 11, which is not a deflection compartment 15; 117675 a retracted roll which receives the load from the lower intermediate roll 12 in the partial nip drive, or receives e.g. the load from the two lower intermediate rolls 12,13 if the partial nip drive has two upper position nips 1,2 according to Figure 1, should be so stiff and a transverse nip load profile error due to load-5. In this case, the load profiles of the calender nip / calender nipples are straight in the transverse direction.

The deflection compensated top roll 11 can compensate for the cross-nip loading profile error caused by the mass and loading of the loading rolls participating in the partial nip, such that the loading profiles of the calendering nip (s) are straight across.

Naturally, in the multi-roll calender 100 of Figure 1, partial nip driving in the upper nip 1 can be used as a driving mode, whereby the nip 2 below the upper nip 1 is kept open.

The multi-roll calender 100 of Figure 2 uses partial nip driving as the driving mode. Otherwise, the multi-roll calender of Figure 2 corresponds to the multi-roll calender of Figure 1, but the number of closed ··· nips differs from that shown in Figure 1. The intermediate nipple φ 20 2 below the upper nipple is closed, whereby the upper nipple 1 is kept open and the load of the intermediate nipple 2 is applied. *: by means of the loading devices 23 of the intermediate rollers 12 and 13 and the brackets and load arms * * * attached to the body F. The corresponding partial nip driving only in the intermediate nip * * · ···· can also be implemented in such other intermediate nipples 3-8 of the · * ··· * where the stiffnesses of the intermediate rolls 13-19 allow a nip to be formed between the two intermediate rolls,, 25. It is recommended that the stiffness of the respective intermediate rolls 12-19, i.e. the outer diameter and inner diameter, and the material be adapted to allow the partial nipple travel in the intermediate nip / s and the material to be adapted to the mass of the rolls and • · * · ·., * · '· * Load deflections do not cause a transverse nip load • • * ·; *' profile profile error.

0:30 pm • ....

····· • * 16 117675

The loading devices 23 refer to, for example, hydraulic power cylinders which, in some cases, can also provide locking of the supporting and loading arms 24 with respect to the calender body F.

The method can also be applied to the multi-roll calender 100 shown in Figures 1 and 2 only in the lower nip positions. In this case, the upper nip positions such as the top nip 1 and the top spacer nip 2 are open and the partial nip driving is performed in the closed / closed lower nip position (s) such as the closed / closed sub nip 9 and / or the upper nip 8. The lower nip adds the multi-roll calender 200 of Figure 3.

The method can be applied to the multi-roll calender 100 shown in Figures 1 and 2 at both the top nip positions and the bottom nip positions, whereby it is possible to calender over the change nip 5 as previously described in this specification. In this case, one of the top nip positions is closed and one of the bottom nip positions is closed, whereby the partial nip driving is performed in closed top and bottom nip positions and can affect one side quality properties of fiber web W such as gloss, smoothness and oil absorption. An example of a partial nip run in both the top nip position and the bottom nip position is illustrated by the multi-roll calender 200 of Figure 5.

• · • t · ···! In partial nip driving, the web entry of the fibrous web W may also be partial, whereby the fibrous web W is guided through some nipples of the calender 200 roll stack 101, as in Figs. 3-5. The fiber web W may be guided outside the multi-roll calender 200 roll stack «· ·" *. * 101 to bypass some calendering nips, whereby during a partial nip run, at least one nip acts as a closed nipple, i.e., a calender. In this case, an advantageous way to implement a partial nip is to arrange at least one closed nip in the roll stack 101 of the multi-roll calender 200 on the roll stack 101 both above and below to one-sided * · * “quality properties of fiber web W such as gloss, smoothness and oil absorption.

17 1 1 7675

In the multi-roll calender 200 shown in Figures 3-5, the top roll 11 'of roll stack 101 is fixed relative to the calender body F. Of course, in the method 5 of the invention, the multi-roll calender with the partial web extension of the fibrous web W in Figures 3-5 may also comprise a top roll with a movable diaper fixed to the calender body F.

In the multi-roll calender 200 of Figures 3-5, which comprises only one roll stack 101. The roll stack 101 overlaps ten calender rolls 1Γ, 12-20, and nine nips 1-9. Out of the rolls not involved in nipples 1-9, take-out rollers 21 are shown. The fibrous web W is illustrated to pass through the five calendering nips 1, 2, 7, 8, 9 of roll stack 101. In the partial nip run, at least one nip of the calendering nipples 1, 2, 7, 8, 9 is open, i. E., A non-calendering nip, and at least one nip calenders the fibrous web. The nipples can be closed and opened.

15 j

In calendering, the fibrous web W is guided into a calendering nip formed between rolls to be pressed against one another, or to calendering nips formed between spaced rolls, which are five in a row in the roll stack of * * · 101 fiber web. In roll stack 101, the fiber web W is arranged to pass through two upper nip positions and three lower nip positions • · »· · *. *: through. In the illustrated web extension, the fibrous web W is taken out of the rolls · · · · * * outside the stack 101 after the intermediate nip 2 to the upper left-hand output roller * · · ·· “21 and reintroduced into the roll stack 101 in the intermediate nip 7 ·· * passed three roller rollers 21, guided from the left side by roll stack 101. . 25 spacer nipples 3, 4, 5 and 6. The bypass of the calendering nipples • · · • ♦ · ** 'shown by roller 101 is intended to be an example of such a web extension of fiber web W, where the partial nip drive can be implemented in the upper nip positions or * * • · · * · * · * in the lower nip positions or both in both the top and bottom nip positions without having to export through all the calendering nipples. In Figures 3-5, in the direction of · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · about W (30) there are five nips 1, 2, 7, 8, 9 in succession.

is 1 1 7675

The lower nip 9 is formed between the lower roll 20, in this case a roll coated with a flexible coating, preferably a polymer-coated roll, and a lower intermediate roll 19, which is a smooth surface press roll, preferably a lower thermal roll. The lower roll 20 in Figs. 5 to 5 is preferably a deflection compensated roll which is loaded and moved by the lower cylinder 22. The lower roll 20's mobility is illustrated by a vertical double-headed arrow symbol. The lowest intermediate roll 19 is lockable relative to the calender body F by a support and loading arm 24 provided with a loading device 23.

The deflection compensated lower roll 20 can compensate for the transverse nip loading profile error caused by the mass and loading of the intermediate rolls participating in the partial nip, such that the loading profiles of the calendering nip (s) are straight in the transverse direction.

In Figure 3, the partial nip drive is implemented only in the lower nip 9 with the top nip 1 and the top intermediate nip 2 of the roll stack 101 open. The lower intermediate roll 19, or preferably the lower thermal roll, is locked relative to the calender body F by means of support and loading arms 24 provided with a loading device 23 and the deflection compensated lower roll 20 is loaded with lower cylinders 22 against the lower intermediate roll 19 locked.

:.: V 20 • «•« · *. 1: In Figure 4, the sub-nip drive is implemented in two lower nip positions, namely * in the lower nip 9 and in the lower intermediate nip 8, whereby the upper nip 1 and the upper intermediate nip 2 are • 1 • · ·

* ··: Open. The intermediate roll 18 above the lowest intermediate roll 19 is locked by the calender body F

With the aid of support and loading arms 24, 25, and lower roll 20, the lower roll 20 is loaded up against the lower intermediate roll 19 and the intermediate roll 18 • · t.

»1; 1 In Fig. 5, partial nip driving is implemented in the roll roll stack 101 of the multi-roll calender 200 in both the upper nip position and the lower nip position, with the closed nipples being the upper nip. 1 and lower nipple 9. The other calendering nips of the Telapino 101 are open. The upper * intermediate roll 12 is loaded against a fixed intermediate roll 1Γ and the lower roll 20 is loaded against 19 1 7675 locked lower intermediate roll 19. In Figure 5, the method of the invention has been applied by calendering the fibrous web W over the interchange nip 5, whereby by appropriately selecting the nip load levels and other process parameters such as running speed, temperature, and humidity, the sealed upper and lower nipples öljynab-migration with sorption.

The web extension of the fiber web W shown in Figs. 3-5 can also be used to provide a partial nip position of the intermediate nip position in which the calendering nip is formed between two intermediate rolls 10. Such a partial nip of the intermediate nip position could be, for example, a partial nip in the upper intermediate nip 2 as in Figure 2 or a partial nip in the lower intermediate nip 8.

It is recommended that the outer diameter and the inside diameter of the respective intermediate rolls 12-13, 17-19 and the material be arranged so that the deflections due to the mass and loading of the rolls do not cause a transverse nip loading profile error to allow partial nip driving in the spacer node (s).

With the multi-roll calender 100, 200 with only one roll stack, the method · *:: · * 20 can produce several different types of fiber and different grades of these types of fibers, such as pre-glossy paper and matte and silk grades. . For fiber types * * · **: these may include: News, SC, MFC, LWC, and WFC •••••••• '. The method can provide two or three calender rolls against one another by loading substantially matte producing line loading levels of 100-300 * ·· · kN / m.

• · 9 f * · * · · V. * All calipers in the calender can be loaded with the desired sanding, which can be · · · equal in all closed nipples. This is achieved by eliminating: the nip projection of the roll stack 10, 101 by the masses of rollers 12-19 and the masses of the roller bearing housings and auxiliaries attached thereto. The loads on the calendering nipples 1-9 20 117675 are adjusted to be desired by either over- or under-reducing the masses of each of the intermediate rolls 12-19 and associated auxiliaries by means of support and loading arms 24 provided with loading means 23.

The method provides a substantially wider range of paper grades than conventional solutions with one and the same multi-roll calender 100,200. In addition to the standard line loads, the Monite lacquer calender can also be used for increasing line loads, or vice versa, ie for decreasing line loads. The adjustment is then performed using the adjustment of the relief forces of the loading devices 23.

10

Figure 6 shows line load level graphs of closed calendering nipples involved in partial nip driving of roll stack 10, 101. The effect of friction has been removed from the load curves. The horizontal axis of the rectangles drawn next to the roll stack 10, 101 depicts the line load in closed nipples formed by the calender rolls participating in the vertical run of the roll stack 10,101 partip-15. In step I, there is a simplified schematic example of a top-down linearly increasing linear load distribution achieved by the method. The area shown in step I depicts a line load distribution in which the nip load is substantially linearly increasing from the first nip to the last nip. This line load distribution Φ 20 is usually achieved when the masses of the rollers and auxiliaries are not compensated • · *. *: da with lightening devices.

····· '• · • · ·

By allowing the weights of intermediate rolls and associated peripherals to be * or * lighter as desired, the full calendering potential of the calipers participating in the partial nip drive can be utilized as desired. In Fig. 6, in point II, the shaded area is a top-down linearly constant linear load distribution, which shaded area represents the entire calendering potential. Different shaded areas are plotted. ♦ · * • · *; · * lines across corners to illustrate that in addition to various standard line load measurements, all linear linear load and drop * · * '· image options are available when selected loadings of nipples suitably involved in partial nip driving 21 117675. Line III of Fig. 6 separately shows a linearly decreasing linear load distribution.

By means of the relief devices 23, a relief force is applied to the supporting and loading arms 24 of the intermediate rolls 5 participating in the partial nip of the rolls, which can partially or completely compensate for the loads caused by the weight of the rolls and auxiliary devices. The weights of the rollers and auxiliaries may thus be partially or completely not affected by nipple loads. In this case, the line load at each nip 1-9 can be different or equal if desired, whereby the line load profiles are as shown in Fig. 6.

Embodiments of the invention in which a multi-roll calender sub-nip run, particularly a matte nip run, is provided in a calender where the roll stack is provided with a matt nipple as an alternative roll stack for normal run paper are imitated by the apumngo and the associated roll mount. Figures 7-12 illustrate various embodiments of this embodiment, and in the Figures, the same reference numerals as Figures 1-5 are used, and the structures correspond to each other unless otherwise stated. mentioned.

In the exemplary embodiments shown in Figures 7-12, the calender 300, 400 roll stack 10, i.e., • · *. **: The roll set (or roll set 10A, 10B) comprises a subframe 301 to which rolls 303 * * and 304 are attached a matte nipple MN can be formed between them. When running the mat nipple MN * ·· · * · ϊ, the mat mat of the rollers 303,304 is closed by the MN cylinders 305 and in turn while the calender 300, 400 rollers / rollers 10; 10A, 10B are used to shine. In order to prevent nip contact between the rollers 303,304, a snack 306, which may be • · · t * «*”. * Fixed, variable in height, and / or removable, is prevented. In the arrangement of Figure 7, the subframe 301 is secured to the calender body F via lever arms 302, and in the applications shown in Figs. 8-12, the subframe 301 is secured to the calender body. · * Through F conductor mechanism 314 or fixed. The following figures also illustrate application examples for the track export paths of various partial nipples · * ♦ "· WA-WE.

22 117675

Fig. 7 shows a calendar according to a preferred embodiment of the invention, in which the roll stack 10 comprises a subframe 301 to which rolls 303,304 formed of a matte nip MN are attached. The rolls 303,304 to be attached may be calender spacers or deflection compensated rolls. The subframe 301 is secured by a lever mechanism 302 to the body F of the calender 300. Between the subframe 301 and the upper roll 303 or lower roll 304, or both, there is a loading cylinder 305 for loading the roll nip MN in a matte run. When calendering glossy grades, there is no nip contact between the rolls 303,304 and the calendering is performed via the other rolls 10 11-14 and 17-20 of the roll stack 10. The nip contact blocking can be implemented by a fixed spacer 306 between the axes of the rollers 303,304. When calendering glossy grades, the subframe 301 can be raised by the cylinder 307 when the roller 10 is closed.

Fig. 8 shows a multi-15 roll calender 300 according to a preferred embodiment of the invention, wherein the calender comprises a subframe 301 to which matt nip rolls 303,304 are attached. The rolls 303,304 to be attached may be calender spacers or deflection compensated rolls. The subframe 301 is secured by a guide mechanism 314 to the calender body F. Below the upper roll 303 attached to the subframe 301, and above the · ·:, .. ϊ, are load cylinders 305 for loading the roll nipple MN.

20 at a time. The upper rack A is closed by cylinder 307 and a line load is created by the upper · · ·

head roller A with cylinder 305 above roller 303. Lower roller B

* '* line load is created by cylinder 22. When calendering glossy grades »» · 303,304 there is no nip contact. The nip contact blocking in the nip MN can be accomplished with an interchangeable snack 306 between the axes of the rollers 303,304. When calendering matte-quality snack 306, the nip contact * * * · “, * nip, and line load can be lowered to create cylinders 305.

A preferred embodiment of a calender according to the invention is illustrated in Figure 9, in which calender 300 consists of a deflection acting as a lower roller of the calender. A '30 compensated roll 303 attached to a subframe 301. The same auxiliary *' '* size 301 also has a calender spare roll 304. A calender top roll 11 is interchangeable with a lower roll 303 and a spare roll 304. The subframe 301 is secured to the calender body F by the guides 314 and is movable by the loading cylinder 22 while driving the entire track. Of the rolls attached to the subframe 301, the lower roll 303 is fixed and the spare roll 304 is movable relative to the subframe 301 or vice versa.

5

In a matte drive, the nip MN is closed by removing the snack 306 and moving the spare roll 304 upward with the lower cylinder 305 or the lower roll 303 down the upper cylinder 305, whichever roll 303; 304 is fixed. As the entire roller track 10 is driven between the lower roller 303 and the spare roller 304, there is a snack 306 preventing the nip-10 stroke MN and stiffening the structure. As before, the entire track is closed by a loading cylinder 22. When running on the whole track, the spare roller 304 can be removed for service if needed and replaced by another snack. The track gauge WA is used for all track systems and the track gauge WB is used for the MN nipple. The number 15 of the guide rollers 312 for guiding the web is determined by the height of the machine.

Fig. 10 shows a preferred embodiment of the invention in which the calender rib 300 consists of a subframe 301 on which is attached a roll 303,304 of a matt nip MN.

• · ·

The upper roll 303 attached to the subframe 301 is a deflection roll of the multi-roll calender. The lower roller 304 may be a spare calender heat roll or a multi-roller roller • ♦ ·. * ·; lumbar deflection compensated roll or custom roll * * * ** * or shoe roll sized for this position. The subframe 301 is secured by a conductor mechanism 314 to a calender run size F. The lower roll 304 can be heated when used as a normal thermo roll, or it can be cooled by using a roll 304 as a cooling cylinder.

25 • · • · ·

The subframe 301 can be fitted with auxiliary rollers 325,326 for various track options • «*** WB, WC, WD, WA. The WB export option WB can be used to bypass the • · roller blade roller blade 10 and use only the mat nipple MN when cold or hot.

The WC path passes through track 10, but is guided by roll 325 to 30 tampers of MN at end of track 10. This option allows the top nipples of the track 101 to be used, but a matte node MN is used at the bottom of the track 10. At step 24, 117675, the WD track passes through roller track 10 all the way down, where it is guided by roller 326 around a thermal roller 304 which acts as a cooling cylinder. In the alternative, the WA track passes through the entire track as previously known and no longer passes through the mat.

5

The nip contact of the mat nip MN can be accomplished by the cylinders 305 and by removing the removable snack 306 between the axes of the rolls 303,304. When calendering the entire roller 10 or using the lowest roller 304 as a cooling cylinder, a nip contact; between the two lower rollers 303,304 is blocked by a snack 306. The chassis 10 and the entire auxiliary nip are moved by the loading cylinder 22.

Fig. 11 is an embodiment of the invention in which the calender is made up of an auxiliary body 301 on which rolls 303,304 of a matt nip MN are fixed. The upper roll 303 attached to the subframe 301 is a pre-calender spare thermal roll, a multi roll calender coil or soft-surface deflection compensated roll, or a custom roll designed for this position. Lower roll 304 is a deflection compensated roll of a multi roll calender. The subframe is fixedly attached to the calender body F. The upper roller 303 may be heated when used as a normal thermal roller or may be cooled by the use of roller 303 as a cooling cylinder.

20 Auxiliary rollers can be attached to the calendar for 325,326 different track options for WB, • · ·. **: WA, WC. With the WB option, the matte nipple MN can be used * · cold or hot. With the WA option, the track traverses the complete set of tracks ♦ ··· ·· .: min known route. The WA option cools the track and passes around the upper roller 303. In this alternative, the rollers 303,304 may have a nip contact or the rollers 303,304 are spaced apart depending on the deflection compensation. jt * dun the direction of the load shoes of roller 304. If there is no * · * between rollers 303,304. nipple contact, the WC option can be used for the entire roller roller *. *, * to a 10.

··· • · ...

The matte nip MN nip contact of the Matt nip can be accomplished by the cylinders 305 and by removing the * "** i detachable snack 306 between the axes of the rolls 303,304 or by using a flexible sleeve 117675 25 in a macrom compensated roll 304. the roller 303 as a cooling cylinder between the rollers 303,304 is blocked by a snack 306.

Figure 12 shows a preferred embodiment of the invention wherein the calender comprises a subframe 301 located at the bottom of the first 10A, the second 10B, or both 10A, 10B rolls. One of the rolls attached to the subframe 301 is a deflection compensated roll 303 of the multi-roll calender, which may also have a diaper load. The counter roll 304 may be a deflection roll 10 of the multi-roll calender, a spare roll of the pre-calender, or its own roll or shoe sized at this position. The order of roll 303 and counter roll 304 in subframe 301 may be changed. The subframe 301 is secured to the calender body by a guide mechanism 314. The counter roll 304 can be heated by using it as a standard thermo roll in the hard / soft nip, or it can also be cooled by using the roll 304 as a cooling cylinder 15. Auxiliary rollers 325,326 may be attached to the subframe 301, which may also be movable for different track access alternatives.

Tracks 10 A JOB can be closed by cylinder 22 independently of each other when using the entire track. In the mat nip drive, the nip contact between the rollers 303,304 is obtained by loading the moving diaper roll diapers or by removing the interstellar 306 and using the cylinders 305. The operation of the tampers of the 10AJ0B matrix can be independent of each other. Tracks 10AJ0B may be partially or completely bypassed by guide rollers 413.

The invention has been described above by way of example only with reference to the figures in the accompanying drawings * * * • JJ. However, the invention is not limited to the representation of the figures, but various embodiments of the invention may vary within the scope of the inventive idea defined in the appended claims.

··· • · • • • ♦ · ♦ · * • · · • ·.

♦ •••• e.

* ·

Claims (11)

1. Multiple roll calender (100,200,300,400) having at least one roll stack (10, 10A, 10B), or comprises, as calender rolls, an upper roll (11) in roll stack 5 and a lower roll (20) in roll roll, which is joined to a calender frame ( F), and at least one intermediate roller located therebetween which is supported against the calender body, wherein the roll stack (10) comprises at least two calender nip, wherein a fiber web (W) is calendered in at least one of them, characterized in that with the calender (300,400) is provided an auxiliary body (301), to which is attached a soft surface upper roller in the auxiliary body and a lower roller in the auxiliary body (303,304) to form a carpet nip (MN) to enable carpet running and between the rollers fixed to the auxiliary body (301) is provided a spacer (306) for preventing pinch contact in the carpet nip when calendering other qualities with the calender and that in connection with the auxiliary body (301) 15 is provided. at least one load cylinder (305) for providing load in the mat nip and / or in the other nip in the roll stack (10). Multicolor calender according to claim 1, characterized in that the auxiliary body ··· ′ ··· ′ (301) is attached to the calender body (F) with a tilting mechanism (302), with a guide arrangement (314) or steadfastly. 3. Multiplexing calender according to claim 1 or 2, characterized in that the intermediate piece (306) is arranged between the intermediate rollers (303,304) in the auxiliary body (301). ) is • *** fixed, detachable or adjustable. 25 • · · • · ·. · * ·. 4. Multiple roll calender according to any one of claims 1-3, characterized in that the load cylinder (305) attached to the rollers (303,304) attached to the auxiliary body (301) ) is placed in connection with the upper roller (303): • · • · '1' in the auxiliary body. • ·: 30 * · .¾%. 1. 117675 29 5. Multiple roll calender according to any of claims 1 to 4, characterized in that the load cylinder (305) arranged in connection with the rollers fixed to the auxiliary body (301) is placed in connection with the lower roll (304) in the auxiliary body. 5 Multiple roll calender according to any of claims 1-5, characterized in that the roll (303; 304) attached to the auxiliary body (301) is a spare roll in the calender, an intermediate roll in the calender or a bend-compensated roll or a shoe roll. Multiple roll calender according to any of claims 1-6, characterized in that the roll (303,304) attached to the auxiliary body (301) is a coolable / heatable roll in the calender. Multicolor calender according to any of claims 1-7, characterized in that the auxiliary body (301) is movable relative to the calender body (F) when changing the calender method. ... 9. Multiple roll calendars according to any of claims 1-8, characterized in that • the roll stack (s) (10.1 OAJ OB) in the calender can be vertical and / or inclined. • t1 • · ··· * · • · Multiple-choice calender according to any of claims 1-9, characterized in that • · «1, ·· *. the multiple-choice calendar has two separate roll bars, at least one of which has an auxiliary body (301) / a mat nip (MN). : 25 • 1 ·: ***: 11. Multiple roll calendars according to any of claims 1 -10, characterized in that • · · .V, the roll stacks (ΙΟ, ΙΟΑ, ΙΟΒ) in the multiple roll calendars are separate and that the carpet nip can • · · t ·, · · 1. be bypassed when strapping. «· • ·