EP1556545A1 - Procede et agencement de calandrage d'une toile - Google Patents

Procede et agencement de calandrage d'une toile

Info

Publication number
EP1556545A1
EP1556545A1 EP02772405A EP02772405A EP1556545A1 EP 1556545 A1 EP1556545 A1 EP 1556545A1 EP 02772405 A EP02772405 A EP 02772405A EP 02772405 A EP02772405 A EP 02772405A EP 1556545 A1 EP1556545 A1 EP 1556545A1
Authority
EP
European Patent Office
Prior art keywords
stack
calender
nips
web
rolls
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP02772405A
Other languages
German (de)
English (en)
Inventor
Pasi Kakkonen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Technologies Oy
Original Assignee
Metso Paper Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metso Paper Oy filed Critical Metso Paper Oy
Publication of EP1556545A1 publication Critical patent/EP1556545A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus

Definitions

  • the invention relates to a method for treating a web with heat and compression in a calender arrangement and a calender arrangement having a supporting frame and a stack of calender rolls for calendering a web, such as paper or board.
  • the invention relates also to a method for improving the performance of an existing calender arrangement.
  • a calender arrangement means here the whole calender arrangement containing all parts related to the machine including for example frames, rolls, control system, web handling equipment and auxiliary equipment related to the process of glazing the web.
  • a calender roll means here a revolving roll which has plain metal surface or surface covering made of polymers or other flexible, elastic or resilient material and the calender roll is used for treating the web in a nip formed between two calender rolls.
  • a stack means here a stack of at least two calender rolls arranged next to each others forming nips between the calender rolls. The stack can be opened so that in the nip the distance between the surfaces of the calender rolls is greater than the thickness of the web.
  • a treating mode means here a way to feed the web through the calender arrangement from unwind to the reel-up.
  • select or selectable means here a possibility to a user of the machine to take some or all features into the use without laborous machanical or automation changes, only with some changes in adjustments and changes concerning auxiliary equipment like guide rolls, moistening devices and similar.
  • auxiliary frame It is known from document WO 02/06584 that it is possible to modify existing calender to a calender of modern type with calender roll relief devices by using auxiliary frame.
  • the intermediate rolls are attached revolvingly to arms pivoted on auxiliary frames, which in turn are attached to vertical portions of the supporting frame of the old calender.
  • auxiliary frames all the necessary equipment for modernization can be incorporated in this frame, and the vertical portions of the old frame that existed prior to the rebuilds, that is, the vertical posts designed to carry the vertical spindles and shaped to act as guides for the bearing housings of the rolls need only be modified in view of mounting the auxiliary frames.
  • the auxiliary frames can be designed as profiles, which in part clamp around the old guides of the frame.
  • each roll stack may be separately operable. Both roll stacks may be arranged in a common machine frame to simplify the overall design of the calender. Further, the two roll stacks may be aligned with each other, so as to support more easily the upper roll stack. It is preferred, that each roll stack includes five rolls and that the machine frame or stanchion may correspond to that of known 12-roll calender.
  • the calender arrangement of the publication is intended to replace the prior art 12-roll calender.
  • the existing machine frame for the old calender may be retrofit and used to embody the calender of this publication.
  • Each calendering unit includes at least one intermediate roll and two hard end rolls defining a respective pair of nips with the intermediate roll on substantially diametrically opposed sides thereof.
  • the intermediate roll of a calendering unit may comprise a soft roll so that the pair of nips of the calendering unit is soft nips so that the calender apparatus comprises a supercalender.
  • the web is passed from a first calendering nip in a first stack of rolls to a first calendering nip of a second stack of rolls to a second calendering nip in the second stack of rolls, from the second calendering nip in the second stack of rolls to a second calendering nip in the first stack of rolls, and after the second calendering nip in the first stack of rolls to further processing.
  • a calender In general a calender is designed for a certain range of process parameters based on trial results.
  • the starting point of designing the calender specification in most cases is the already produced base paper.
  • the trials are run and according to the results of these trials the configuration of a calender arrangement is designed. This includes the number of nips; the calender roll diameters, the minimum and the maximum linear loads in the nip, the running speed, the temperature of heated rolls, moistening devices, etc.
  • There is a drawback in present calender arrangements that it is difficult to modify when the base paper changes for some reason, for example due to increase of portion of recycled fiber in stock. It is the object of the invention to provide an improved method and arrangement for increasing the versatility of a calender arrangement.
  • calendering treatment is selected to be performed in calendering nips which can be of the first stack and/or of the second stack where both of the complete stacks or parts of the stacks can be used independently or as a combination together with the other complete stack or parts of the other stack.
  • a calender is designed only for one treating mode so that there are only one way to feed the web through the machine from unwind to the stack or stacks and further to the reel- up.
  • the present invention enables a fast and easy way to modernize a calender to fulfill the requirements of modern time without removing the possibility to use the original calendering concept.
  • the web is guided first through all the nips of the first stack and after that through all the nips of the second stack.
  • the web is guided first partially through the nips of the first stack and after that at least partially through nips of the second stack.
  • the web is guided first partially through the nips of the first stack and after that at least partially through the nips of the second stack and after that partially through the remaining nips of the first stack.
  • the web is guided first partially through the nips of the second stack and after that at least partially through nips of the first stack.
  • Still another possibility is that the web is guided first partially through the nips of the second stack and after that at least partially through the nips of the first stack and after that partially through the remaining nips of the second stack.
  • At least one of the two stacks are designed such that they provide a complete web treatment arrangement fullfilling predetermined parameters, so that it is possible to exclusively use that stack without the necessity of incorporating the other stack or parts of it into the web treatment process.
  • the object of the invention is also solved in that in addition to a first stack the calender arrangement is provided with a second stack each of which including one or more calendering nips, the calendering nips to be used are selectable out of the first stack and/or of the second stack wherein both of the stacks or parts of the stacks are useable independently or as a combination together with the other stack or parts of the other stack.
  • the calender arrangement comprises the first stack and the second stack and said second stack is arranged on a second frame and said second frame is removable connected to a first frame. This creates a possibility to minimize the preparation work of an existing calender arrangement to modify it according to the invention.
  • the second frame is adjustably interconnected to the first frame.
  • a fast running web is very sensitive to all kind of misalignment errors of rolls contacting the running web.
  • the runnability of the calender arrangement is dependent on these alignments and runnability is one key factor that determines how much production it is possible to do with the calender arrangement.
  • said second frame is adjustable in position in relation to the first frame such that the adjustment is feasible in the directions X, Y or Z independently from each others.
  • FIG. 1 shows schematically a calender arrangement according to one embodiment and the treating mode as it is in existing calender.
  • FIG. 2 shows schematically other option of treating mode according to one embodiment.
  • FIG. 3 shows schematically still another option of treating mode according to one embodiment.
  • FIG. 4 shows schematically still another option of treating mode according to one embodiment.
  • FIG. 1 shows a calender arrangement according to one embodiment of the invention.
  • the first calender rolls 1 to 11 are arranged revolvingly on the top of each other's so that they form a first stack 15.
  • a second stack 33 of revolving calender rolls 34 to 40 is arranged.
  • the calendering nips 0 to be used are selectable out of the first stack 15 and/or of the second stack 33 wherein both of the stacks 15 and 33 or parts of the stacks are useable independently or as a combination together with the other stack or parts of the other stack.
  • the arragement enables a large variety of possibilities how the web can be guided through the whole calender arrangement 13. It can be guided through the first stack exclusively (as shown in FIG.
  • the second stack 33 is arranged through levers 62 to a separate second frame 42, which is removably attached to the first frame 17.
  • the second frame comprises at least two parts of frames; one part in tending side and other part in drive side of the machine arrangement and appropriate number of cross- brackets.
  • Interconnection sections 56 between the first and the second frame are designed so that it requires minimum amount of interconnection preparations to the first frame but the interconnection still creates fixed and sturdy mechanical connection between the first and second frame.
  • the second frame has all the features of the first frame; sometimes it is useful to attach also a number of guiding rolls and tail threading equipment to the second frame.
  • the interconnection section 56 between the first and the second frame is designed, so that it enables very accurate positioning of the second frame 42 compared to the first frame 17.
  • the interconnection allows adjustments in X (horizontal, in direction of the length of the machine), Y (horizontal, in cross direction of the machine) and Z (vertical) directions and most preferably the adjustment of one direction does not change the position in one of the other coordinates.
  • the positioning accuracy must be approximately 1/100 mm.
  • a bolted joint or similar arrangement is preferred.
  • the fixed first frame 17 is attached to foundations of building.
  • the first frame is made of steel, cast iron or other suitable material, which forms solid basement for the calender arrangement.
  • the first frame is also constructed, so that it is formed from at least two parts, the other part is located on the tending side of the paper or board making machine and the other part is located on the drive side of the machine. Between these two parts there are cross-brackets mechanically connecting these two parts of the first frame 17.
  • the cross- brackets may contain electric cables and hydraulic pipelines going from side to side.
  • Calender rolls 1 to 11 are covered with soft coverings (conventional cotton or polymer covering) or they have plain hard metal outer surface.
  • the diameter of a calender roll is selected according to the wanted process conditions, typically it is from 300 mm up to 1200 mm and more.
  • Calender rolls in different positions might have different inner structure; they might comprise heating equipment or deflection compensating arrangement.
  • the calender rolls 1,3,5,7,8 and 10 are soft covered and the rolls 2, 4, 6, 9 and 11 are hard covered. Also other arrangements of different type of rolls are possible.
  • the calender rolls in the second stack are similar or different type of calender rolls than in the first stack 15.
  • the second stack 33 includes two or more calender rolls, the number of calender rolls in the second stack depends on frame construction and properties of the web which is intended to treat with he second stack. Also the diameter of the calender rolls in the second stack is the same or different to the calender rolls in the first stack.
  • the calender rolls 1 to 11 of the first stack are movably attached to a first frame 17 through levers 60. The calender rolls are pressed against each other's by means of force elements such as hydraulic cylinders. A contact point or line between two calender rolls where the treating of a web W happens is the nip 0.
  • the levers have a stand for a calender roll bearing housings and the levers are attached to the first frame by means of a bearing arrangement.
  • the first frame includes a number of pivot joints or a sliding bearing arrangement where the levers 60 are attached. Distance between the pivot joints is approximately the diameter of a calender roll.
  • a lubricated bronze bearing is commonly used bearing type here.
  • a spindle nut or other similar arrangement is used for moving vertically the calender rolls 1 to 11.
  • the first stack 15 is also of modern type with similar levers 62 as in the second stack 33.
  • a unwinding section 19 is located in the upper portion of the calender arrangement. It is the first element in process direction of a calender arrangement 13.
  • a paper or board web W to be processed is stored on a web roll 23.
  • the web roll is wounded on reel spool or winding core 21 depending on the machine arrangement.
  • the reel spool or winding core comprises a shaft and a bearing housings separated from the shaft.
  • the reel spool together with the web roll is attached through a coupling device to a drive 25.
  • the drive is connected to a control system.
  • the reel spool together with the web roll is supported by a reeling frame, which carries the whole weight of web roll and reel spool.
  • the unwinding section is equipped with a splicing device.
  • the splicing device includes a lifting device and a transport device, a joining device with a tape arrangement and a full width cutting device.
  • a first measuring device 27 has a measuring head and a cross directional guiding arrangement for the measuring head. The device measures different properties of the web for example moisture, ash content, thickness, gloss etc. before the web is processed. A web tension-measuring device is also included in this section. Tension measuring can be based on guiding roll weight measurement or on an air pressure caused by the travelling web.
  • a second measuring device 29 is similar to the first measuring device 27 but it measures properties of the web W after the calendering process.
  • a tail threading device 58 is arranged to every free draw of the web.
  • the tail threading device is a rope arrangement, a belt arrangement, an underpressure or overpressure arrangement or a combination of these. It has a number of guiding devices which guides the web through the calender from the unwinding position to a reel-up position.
  • Guiding rolls 44 are mounted to the calender frames to such locations that the free draws between guiding rolls stay relatively short, for example half the width of the web if the web is 10 meters wide.
  • Special type of guiding roll called spreading roll is arranged in appropriate positions for example before the first nip 0 of the first stack 15.
  • Flyer rolls 54 are used between two nips 0 to turn the web coming from the one nip to the following nip 0.
  • a moistening device 31 moistens either of the sides of the web and it can be controlled in cross direction of the web so that it can create different moisture profiles to the web.
  • the moistening device 31 is attached either to the first frame 17 or to the second frame 42 or it has a frame of it's own.
  • the moistening devices 31 can be located between one nip 0 and the following nip 0 in either of the stacks (as shown in FIG. 4) or between stacks 15 and 33.
  • a reel-up 46 rolls the calendered web back to a roll 23.
  • the roll is wound on similar reel spool 21 or winding core, as it is unwound at the unwinding section 19.
  • the main parts of the reel-up are frame, pressure roll 48, drives 25, reel change device 50 and reel spool storage 52 for empty reel spools.
  • the reel-up is equipped with oscillating device. The following describes function of above mentioned arrangement and some benefits achieved with the method.
  • Calendering arrangement is normally designed for certain range of process parameters and ways to operate it.
  • the web In the calender stack the web is treated by the effect of heat and compression.
  • the properties of the web itself moisture, pulp and fibers, binding agent, ingredients, etc. together with the elements of compression determines the final result of the calendering process.
  • the treating modes can be created, so that the web runs between the first and the second stack.
  • the following treating modes are possible:
  • At least the second stack 33 is of modern calender type with multiple nips.
  • One preferred embodiment is described in fore mentioned US patent 5,806,415. It has preferably more than one nip, for example 6 nips (7 calender rolls). It has a calender roll weight relief system and possibility to control independently each nip of the second stack.
  • the linear load is adjustable so that the load in each nip can be the same, for example 100 kN/m to 425 kN/m.
  • the calender rolls in the second stack have drives, all the calender rolls may have an own drive.
  • the modern type of calender rolls used in this second stack enables longer running times and faster process speed with less maintenance required. Mainly this is due to improved characteristics of the modern polymer coverings, which can offer several advantages over the traditional ones.
  • the first stack 15 is of conventional type of supercalender. Naturally it can be also of the modern type with multiple nips.
  • the calender rolls 1 ,3,5,7, 8,10 are cotton filled rolls and the calender rolls 2, 4, 6, 9 and 11 are so called chilled cast iron rolls.
  • the diameters of the rolls are approximately 560 to 1000 mm and the compression or linear load varies from the first nips 120 kN/m to the bottom nips 325 kN/m. This means that the nip load between the calender rolls 1 and 2 is 120 kN/M and between the calender rolls 10 and 11 it is 325 kN/m.
  • SC-paper supercalendered paper
  • the possibilities of controlling the first calender stack are quite limited, it is possible to alter the process parameters only inside the originally designed values. Some of the rolls are driven not necessary all. Typically the bottom roll 11 is driven and it is also equipped with deflection compensating elements.
  • the second stack 33 allows also the decrease of linear loads in the first stack 15, because the number of nips 0 can be selectively increased. This enables faster running speeds because the load of the calender roll is reduced and the heating effect of the nips under deformation is reduced. Also the tendency of stack vibration or barring is reduced due to reduced linear load. It is also possible to increase linear load in the beginning of the calendering process and reduce the linear load in last portion of the calendering process to reduce the lost of bulk during the process.
  • the installation of the second frame enables the attachment of all auxiliary equipment in an efficient way. It is not necessary to modify the first frame 17 in a large extent but just so that the optional installation of the second frame 42 is possible. An important detail in the attachment is to create sturdy connection that can be adjusted accurately. The web must run in the calender arrangement smoothly and the alignment of the stacks and the calender rolls as all the guide rolls too is one main element here.
  • the function is to unwind the web roll and maintain proper tension in the web.
  • the drive brakes the unwound roll according to the tension measurement. Proper tension is such that the web does not flap and it runs smoothly to the process.
  • the splicing device joins the web from nearly completely unwound roll to a new web coming from a new web roll. This enables continuous operation of the calender and reduces the laborious tasks of the operating crew.
  • the aim is to affect on physical properties of the processed web, for example gloss, thickness, surface smoothness, etc..
  • measuring devices before and after the calender stack or stacks, it is possibly to monitor these properties on-line during the process.
  • the function of the guiding rolls 44 is to guide the web into the calender stack so that runnability of the whole calender arrangement is as good as possible.
  • the runnability means that the web runs smoothly without disturbance to the process.
  • the spreading roll spreads the web so, that it won't overlap just before going in the calender stack.
  • the calender arrangement has produced SC-grade paper for ten years.
  • the calendering arrangement comprising only the first stack does not produce any longer adequate calendering result for the new type of web.
  • the measured web properties; gloss, smoothness, bulk, etc are deteriorated. It is possible to select the optimal treating mode for the new base paper, by introducing the optional second stock of modern calender type.
  • This new selection can be for example three nips of the second stack run with a load of 250 kN/m at each nip and having hard rolls at the top side of the web and then further processing the web in the three nips between the calender rolls 8,9,10 and 11, having load of 250 kN/m to 300 kN/m and having the hard rolls at the wire side of the web.
  • the gloss of the web remains the same as it was prior to the raw material change, but the bulk is better than used to be.

Landscapes

  • Paper (AREA)

Abstract

L'invention concerne un procédé de traitement d'une toile (W) thermiquement et par compression dans un agencement de calandre (13), qui en plus d'un premier empilement (15) comporte un second empilement (33) chacun d'eux comprenant un ou plusieurs points de pinçage (0), le traitement de calandrage étant choisi afin d'être réalisé aux points de pinçage (0) qui peuvent être ceux du premier empilement (15) et/ou du second empilement (33), où les deux empilements (15, 33), ou une partie des ces empilements (15, 33), peuvent être utilisés de manière indépendante ou en combinaison ensemble avec l'autre empilement (15, 33) ou avec une partie de l'autre empilement (15, 33).
EP02772405A 2002-10-30 2002-10-30 Procede et agencement de calandrage d'une toile Withdrawn EP1556545A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2002/012117 WO2004040059A1 (fr) 2002-10-30 2002-10-30 Procede et agencement de calandrage d'une toile

Publications (1)

Publication Number Publication Date
EP1556545A1 true EP1556545A1 (fr) 2005-07-27

Family

ID=32241228

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02772405A Withdrawn EP1556545A1 (fr) 2002-10-30 2002-10-30 Procede et agencement de calandrage d'une toile

Country Status (4)

Country Link
EP (1) EP1556545A1 (fr)
JP (1) JP4224027B2 (fr)
AU (1) AU2002337182A1 (fr)
WO (1) WO2004040059A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103215841A (zh) * 2012-01-18 2013-07-24 美卓造纸机械公司 用于多辊压光机的方法及多辊压光机

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI117868B (fi) * 2006-01-02 2007-03-30 Metso Paper Inc Förfarande och flervalskalander för att kalandrerattapintaisen kuiturainan kalanteroimiseksi
FI119154B (fi) * 2006-12-07 2008-08-15 Metso Paper Inc Monitelakalanteri ja menetelmä monitelakalanterissa

Family Cites Families (8)

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Publication number Priority date Publication date Assignee Title
FI62874C (fi) * 1979-10-15 1983-03-10 Valmet Oy Pappers kalander
FI65106C (fi) * 1980-06-10 1984-03-12 Valmet Oy On-machine superkalander foer en pappersmaskin
DE3821027A1 (de) 1988-06-22 1989-12-28 Kuesters Eduard Maschf Kalanderanordnung
FI95062C (fi) * 1993-12-29 1995-12-11 Valmet Paper Machinery Inc Kalanteri
DE4412625C2 (de) 1994-04-13 1999-05-06 Kleinewefers Gmbh Vorrichtung und Verfahren zum Behandeln einer Materialbahn
FI107746B (fi) * 1996-02-23 2001-09-28 Metso Paper Inc Menetelmä paperiradan tai vastaavan kalanteroinnissa
FI4460U1 (fi) 2000-02-21 2000-06-02 Valmet Corp Kalanteri
US6612228B1 (en) 2000-07-14 2003-09-02 Metso Paper, Inc. Calender and method for rebuilding a calender

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004040059A1 *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103215841A (zh) * 2012-01-18 2013-07-24 美卓造纸机械公司 用于多辊压光机的方法及多辊压光机
CN103215841B (zh) * 2012-01-18 2016-01-06 维美德技术有限公司 用于多辊压光机的方法及多辊压光机

Also Published As

Publication number Publication date
WO2004040059A1 (fr) 2004-05-13
JP4224027B2 (ja) 2009-02-12
JP2006504875A (ja) 2006-02-09
AU2002337182A1 (en) 2004-05-25

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