EP1784535B1 - Faserbahnverarbeitungsvorrichtung mit metallbandschleife - Google Patents

Faserbahnverarbeitungsvorrichtung mit metallbandschleife Download PDF

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Publication number
EP1784535B1
EP1784535B1 EP05775185.1A EP05775185A EP1784535B1 EP 1784535 B1 EP1784535 B1 EP 1784535B1 EP 05775185 A EP05775185 A EP 05775185A EP 1784535 B1 EP1784535 B1 EP 1784535B1
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EP
European Patent Office
Prior art keywords
metal belt
belt
roll
calender
web
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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.)
Not-in-force
Application number
EP05775185.1A
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English (en)
French (fr)
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EP1784535A4 (de
EP1784535A1 (de
Inventor
Henri Vaittinen
Maria Lepola
Mika Viljanmaa
Kari Hasanen
Matti Leppänen
Reijo PIETIKÄINEN
Eero Suomi
Pauli Kytönen
Timo Torvi
Markku Kirvesmäki
Tony Lehto
Kari Martikainen
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Valmet Technologies Oy
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Valmet Technologies Oy
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Publication of EP1784535A1 publication Critical patent/EP1784535A1/de
Publication of EP1784535A4 publication Critical patent/EP1784535A4/de
Application granted granted Critical
Publication of EP1784535B1 publication Critical patent/EP1784535B1/de
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/006—Calenders; Smoothing apparatus with extended nips
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip

Definitions

  • the present invention relates to optimizing a fibrous web processing apparatus for different uses, the processing apparatus comprising a metal belt forming a loop and rotating around at least one guide means.
  • the term 'web processing' refers to the various measures relating to the processing of a fibrous web in a paper/board machine, such as pressing, drying, calendering, coating, sizing and smoothing.
  • the processing apparatus may also be a fibrous web finishing machine, such as a separate coating machine, printing apparatus or calender.
  • a processing apparatus provided with a metal belt allows the use of an extremely broad pressure range and effective period (heat transfer time and/or processing time) in the processing zone, thus making it possible to use the same apparatus for processing numerous different coated and uncoated printing papers, boards and other paper grades, and it may be used, for example, as a precalender before coating and an final calender after the paper machine or coating, a breaker stack, a wet stack calender or drying apparatus, a coating apparatus, a sizing apparatus, a printing apparatus and/or a press.
  • a processing apparatus with a metal belt can conceivably be used to replace, for example, a soft calender, a multi-nip calender, a machine calender, a shoe calender, the Yankee cylinder part of a dryer group, or a press.
  • Paper and board grades There are numerous different paper and board grades and they can be divided into two categories by grammage: papers, which have one layer and a grammage of 25-300 g/m 2 and boards made by multi-layer technique and having a grammage of 150-600 g/m 2 . As can be seen from this, the borderline between paper and board is a sliding one since boards having the lightest grammage are lighter than the heaviest of papers. Paper is generally used for printing and board for packaging.
  • Mechanical pulp based, i.e. wood-containing printing papers include newsprint, uncoated magazine paper and coated magazine paper.
  • Newsprint is composed either completely of mechanical pulp or it may contain some bleached softwood pulp (0-15%) and/or recycled fibre to replace some of the mechanical pulp.
  • general values for newsprint may be regarded the following: grammage 40-48.8 g/m 2 , ash content (SCAN-P 5:63) 0-20%, PPS-s10 roughness (SCAN-P 76-95) 3.0-4.5 ⁇ m, Bendtsen roughness (SCAN-P21:67) 100-200 ml/min, density 600-750 kg/m 3 , brightness (ISO 2470:1999) 57-63%, and opacity (ISO 2470:1998) 90-96%.
  • Uncoated magazine paper usually contains 50-70% mechanical pulp, 10-25% bleached softwood pulp, and 15-30% fillers.
  • Typical values for calendered SC paper are: grammage 40-60 g/m 2 , ash content (SCAN-P 5:63) 0-35%, Hunter gloss (ISO/DIS 8254/1) ⁇ 20-50%, PPS s10 roughness (SCAN-P 76:95) 1.0-2.5 ⁇ m, density 700-1250 kg/m 3 , brightness (ISO 2470:1999) 62-70%, and opacity (ISO 2470:1998) 90-95%.
  • LWC paper may be regarded the following: grammage 40-70 g/m 2 , Hunter gloss 50-65%, PPS S10 roughness 0.8-1.5 ⁇ m (offset) and 0.6-1.0 ⁇ m (roto), density 1100-1250 kg/m 3 , brightness 70-75%, and opacity 89-94%.
  • MFC paper machine finished coated
  • grammage 50-70 g/m 2 Hunter gloss 25-70%
  • PPS S10 roughness 2.2-2.8 ⁇ m density 900-950 kg/m 3
  • brightness 70-75% brightness 70-75%
  • opacity 91-95% opacity 91-95%.
  • FCO paper film coated offset
  • grammage 40-70 g/m 2 Hunter gloss 45-55%
  • PPS S10 roughness 1.5-2.0 ⁇ m density 1000-1050 kg/m 3
  • brightness 70-75% brightness 70-75%
  • opacity 91-95% opacity 91-95%.
  • MWC paper medium weight coated
  • grammage 70-90 g/m 2 Hunter gloss 65-75%
  • PPS S10 roughness 0.6-1.0 ⁇ m density 1150-1250 kg/m 3
  • brightness 70-75% brightness 70-75%
  • opacity 89-94% opacity 89-94%.
  • HWC heavy weight coated
  • HWC has a grammage of 100-135 g/m 2 and it can be coated even more than twice.
  • Woodfree printing papers made of chemical pulp, or fine papers include uncoated and coated chemical-pulp based printing papers, in which the proportion of mechanical pulp is less than 10%.
  • Uncoated chemical-pulp based printing papers contain 55-80% bleached birchwood pulp, 0-30% bleached softwood pulp, and 10-30% fillers. With WFU, the values vary considerably: grammage 50-90 g/m 2 (up to 240 g/m 2 ), Bendtsen roughness 250-400 ml/min, brightness 86-92%, and opacity 83-98%.
  • Release papers have a basis weight ranging from 25 to 150 g/m 2 .
  • Boards constitute a fairly heterogeneous group which includes grades having a high grammage of up to 500 g/m 2 and grades having a low grammage of about 120 g/m 2 , the grades ranging from ones based on virgin fibre to 100% recycled fibre based grades, and from uncoated to multiply coated.
  • board grades are divided into coated and uncoated grades because coating has the greatest effect on the calendering method.
  • coated grades both precalendering before the coating machine and the final calender after the coating machine are used. Uncoated grades are only subjected to final calendering. These two groups include several board grades as follows:
  • Coated board grades vary from one-layer to five-layer board. The most important qualities are large bulk, rigidity and smoothness.
  • the board is often one-sided, but may also be two-sided (SBB boards).
  • Precalendering is applied before the coating machine to reduce roughness and porosity to a target level characteristic of the coating machine.
  • the precalendering method is dependant on many variables, the most important being the following:
  • Precalendering mainly serves the purpose of CD-direction calibre control when there is a Yankee cylinder in the board machine (typically a folding boxboard machine).
  • the Yankee cylinder produces an extremely smooth surface with large bulk.
  • Precalendering is usually done with one hard-nip calender, based on either thermal or hydraulic calibre control. Line loads are typically fairly low, 10-30 kN/m, and thermo roll temperatures 70-100°C.
  • Typical board grades made without a Yankee cylinder are solid bleached board, white top liner, coated recycled board and liquid packaging board.
  • precalendering was carried out by using a multi-roll hard-nip calender and the calendering effect was enhanced by adding water by means of water boxes (wet stack calenders).
  • the number of rolls varies from 4 to 11 depending on the board grade; the more readily calendered European fibres do not require as many nips as fibres originating from the southern parts of the USA.
  • Recycled fibres are likewise more readily calendered than virgin fibres.
  • thermo roll has shifted precalendering towards hot calendering.
  • the aim is to use hot hard nip calendering or soft calendering.
  • Increased thermo roll temperatures result in bulk savings due to the temperature gradient.
  • the runnability of a hot hard nip calender or soft calender is better than that of a multi-roll hard nip calender.
  • the application of water on wet stack calenders is not easy to control.
  • Uncoated board grades often have only one or two layers. Multi-layered, uncoated boards, such as liquid packaging boards, can also be produced. As with coated boards, the calendering of uncoated boards should also save on bulk and rigidity.
  • calendering is not required.
  • calendering was almost always carried out on hard nip calenders.
  • the display and advertising function of fluted packages has recently become increasingly important. This has increased demands for a higher-quality, bleached surface layer.
  • Soft calenders are, therefore, used also for uncoated board grades when good printability is required.
  • Steam-jet sprayers may be used before the calender to improve the outcome of calendering if the board is cooled.
  • WO 03/064761 A1 WO 03/064764 A1 and WO 03/064762 A1 respective fibrous web processing apparatuses using a metal belt loop and their applications to different uses are described.
  • WO 01/71091 A1 shows an arrangement for calendering a fibrous web by means of a calender in a paper/board machine according to the preamble of claim 16.
  • EP 1 357 225 A1 shows an arrangement for calendering a fibrous web by means of a calender in a paper/board machine according to the preamble of claim 17.
  • a general aim of the present invention is to enhance the operation and the usability of the processing apparatus at different points on production line and/or finishing stages of a fibrous web in said machine.
  • the ratio between a length of a metal belt and a width of a metal belt is a significant factor from the functioning viewpoint in processing apparatuses comprising metal belts forming loops and having a belt width within the range from about 1.5 m to about 12 m.
  • the invention provides a fibrous web processing apparatus for different uses in a paper/board machine and/or finishing machine, the processing apparatus comprising a metal belt forming a loop and rotating around at least one guide means, the apparatus comprising one or more processing zones, whereby the contact time of a fibrous web with the metal belt is within the range 10 to 1000 ms and the temperature of the metal belt is within the range 20 to 400°C, and wherein the ratio of the length of the metal belt to its width is greater than 0.8.
  • Outside the metal belt loop is preferably arranged at least one counter-element forming a contact surface with the belt, in such a way that between the belt and the counter-element is formed a web processing zone through which the web to be processed is led.
  • a calender provided with the metal belt loop and a coating machine may have about 70% of interchangeable parts and a calender and press equally about 70%, whereas a press and a coating machine may have some 40% of common parts.
  • cleaning means for cleaning the processing surface of the metal belt said cleaning means being selected from a group including a felt cleaner, a brush cleaner, cleaning by spraying washing solution, steam or compressed air under pressure from a washing device, and cleaning based on ultrasonic vibration or other oscillation.
  • WO 2004/079091 A1 discloses one solution for modernisation.
  • another aim of the invention is to provide a multi-nip calender for calendering a fibrous web in a paper/board machine, a lengthened contact zone being incorporated in the calender for enhancing heat transfer of the web.
  • a metal belt loop is incorporated outside a roll in the calender, in such a way that a lengthened preheating zone is formed immediately before the nips of the calender, whereby a high preheating effect is achieved, the ratio between the length of the belt in the metal belt loop and its width being greater than 0.8.
  • the metal belt loop is incorporated outside a roll of the calender in such a way that a lengthened final cooling zone is formed after the calender nips, the ratio between the length of the belt in the metal belt loop and its width being greater than 0.8.
  • the web is cooled. Cooling preferably takes place against the final roll, most preferably against a polymer roll. Cooling makes it possible to use higher calendering temperatures without endangering rolling or the fibrous web drying excessively.
  • calendering enhanced according to the invention are produced glossy, coated or uncoated printing papers and boards in such a way that the enhancement of heat transfer will promote the smoothing process.
  • Examples include wood-containing uncoated printing paper (SC: Hunter 40-60%), wood-containing coated printing paper (LWC Hunter 50-70%, MWC Hunter 65-75%, HWC) and coated fine paper (e.g. WFC: Hunter 70-90%) and coated folding boxboard (more detailed values are available in the publication FAPET: Papermaking, Part a: Finishing).
  • calendering enhanced according to the invention are produced low-gloss, coated or uncoated printing paper and board products such as newsprint (Hunter 20-30%) and uncoated fine paper (copying paper, WFU: Hunter ⁇ 30%).
  • matt grades By means of calendering enhanced according to the invention can be produced so-called matt grades. This means especially WFC matt grades (Hunter ⁇ 35%).
  • WFC matt grades Hunter ⁇ 35%).
  • the roll used in the matt run can be loaded separately so that the entire set of rolls will not have to be used in a partial nip run.
  • calendering enhanced according to the invention may also be calendered low- or high-gloss boards.
  • the metal belt loop is preferably used in conjunction with a soft or shoe calender.
  • calendering enhanced according to the invention may also be calendered release paper. It is particularly advantageous to use the belt loop in a multi-nip calender.
  • the processing apparatus may form a long preheating or final cooling zone to enhance calendering and may thus be arranged either in a multi-nip calender (super or OptiLoad or TwinLine) or in a soft/shoe calender.
  • the calendering described may be either precalendering or final calendering.
  • Figure 1 shows an embodiment of a LWC paper production line illustrating parts of a line from a press section I onwards.
  • the press section is followed by a dryer section II, the end part of which is marked with reference marking III.
  • the dryer section is followed by a precalendering stage IV and then a coating stage V, which is divided into a coating head Va and a dryer section Vb.
  • the coating head is followed by a final calendering stage VI and last by final processing stages VII including rolling and slitting.
  • the processing apparatus comprising a metal belt could conceivably be located, for example, at the points marked with references a, b, c and/or d on an on-line production line for LWC paper.
  • processing apparatus could conceivably be located, for example, in place of the press of the press section I, the end part III of the dryer section and/or the precalender IV and/or the final calender VI.
  • Figure 2 shows diagrammatically a processing apparatus comprising a calendering belt 2 made of metal which rotates around guide rolls 3 and forming a metal belt loop, of which guide rolls 3 at least a part are movable for adjusting the belt tension and/or overlap angle as desired.
  • the calendering belt 2 travels around a roll 5 arranged outside the belt loop, thus forming a calendering zone between the belt 2 and the roll 5.
  • a material web W being calendered travels through the calendering zone, whereby it is subjected to desired pressure impulse and thermal effect as a function of time.
  • Figure 2 shows in dotted line 9 the shape of the pressure impulse when inside the calendering belt 2 is arranged a nip roll 4 acting as a pressing means, the nip roll 4 pressing the belt against the roll 5, thus forming a higher pressure within the calendering zone of the processing zone.
  • broken line 8 is, on the other hand, illustrated the shape of the pressure impulse when the contact pressure prevailing in the calendering zone is created by belt tension alone, the roll 4 being out of pressing contact with the belt 2 (or when no roll at all is fitted inside the belt 2).
  • the roll 4 may in addition be arranged to be movable for changing the length of the processing zone and/or belt tension. There may also be more than one press roll 4 inside the metal belt loop.
  • the metal belt 2 may also be coated.
  • the nip roll 4 is a shoe roll.
  • Reference numeral 6 denotes heating means, such as an induction heater, an infrared radiator, a gas burner or a capacitive heater.
  • the guide rolls 3 are used as internal guide means of the belt loop 2, said rolls being heatable and having a large diameter, e.g. within the range from 1000 to 2000 mm.
  • the large diameter eliminates metal belt fatigue because the radial bending radius does not allow a fatiguing load with the metal belt thicknesses used.
  • a large guide roll diameter provides the guide roll with high axial rigidity and thus significantly reduces the deflection of the guide roll due to metal belt tension. It is often desirable to heat the metal belt to achieve two-sided calendering during one process stage.
  • the drying cylinders of paper and board machines meet the foregoing demands well.
  • a drying cylinder of a paper/board machine may act as the at least one guide means internally of the metal belt loop, the diameter of the cylinder being about 1000 mm to about 2000 mm.
  • cleaning means for cleaning the processing surface of the metal belt, the cleaning means being selected from a group comprising a felt cleaner, a brush cleaner, cleaning by spraying a washing solution, steam or compressed air under pressure from a washing device, and cleaning based on ultrasonic vibration or other oscillation of the belt.
  • the cleaning means can be made essentially shorter than the width of the belt and arranged to move in an oscillating manner along a beam or other support structure extending transversely to the belt.
  • Cleaning methods used may be divided into three groups: contacting, non-contacting and semi-contacting methods.
  • a felt cleaner 30 shown in Figure 3 is based on a felt 31 travelling around rolls 33, 34 which felt rubs the belt 2 being cleaned when the felt rotates against the surface of the metal belt. If necessary, an additional load shoe 35 may be used to increase compression and contact between the belt and the cleaning felt.
  • the apparatus may be continuously operating or it may be started up when necessary (intermittent).
  • the felt 31 of the felt cleaner may be composed of one layer of felt material 31a or be multi-layered incorporating, for example, a plastic wire or support structure 31b of other material ( Figure 4 ) to support the felt material 31a.
  • the felt material may be soft felt (e.g. material corresponding to the bottom felt) or abrasive material. An advantage of abrasive material is that it also evens out the belt loop's roughness.
  • the belt cleaning system may be freely located in the belt loop of the calender, but a primary location would be after the nip outlet, as marked with reference numeral 10 in Figure 2 , to ensure that the dirt removed will not enter the nip pressing zone. Locating the cleaner in an open draw will also dampen the vibration/oscillation of the belt. With respect to the metal belt 2, the cleaner 30 may be located either horizontally against the belt loop or at a certain angle so that the outer edge of the cleaner will extend beyond the edges of the belt, as shown diagrammatically in Figure 5 .
  • the felt may be humidified by means of nozzles referred to by reference numeral 32 in Figure 3 either outside or inside the felt loop.
  • a washing function for example, a combined compressed air/water wash, steaming (steam wash/heating of the felt) or solvent wash.
  • the liquid used as detergent may be either volatile or non-volatile, a solvent or other liquid.
  • the washing/humidifying of the felt may be carried out as pool washing, for example, as shown in Figure 6 .
  • a washing device or its part is wetted either by directly inclining or turning into a washing trough 37 filled with washing liquid (volatile/non-volatile solvent).
  • the felt may also be washed by means of vibrating methods (e.g. ultrasound).
  • vibrating methods e.g. ultrasound
  • dirt adheres to the washing felt and/or the removed liquid/solid matter is collected into a collection trough 36 (see Fig.3 ) under the washing device.
  • a steel brush cleaner 40 shown in Figure 7 rotates either continuously or intermittently while cleaning the metal belt.
  • the cleaner may rotate either independently or with the metal belt loop. Its cleaning effect is based on the abrasive impact of steel bristles (steel brush) as they rotate. When rotating, the steel brush also grinds possible impurities and/or damage (e.g. grooves) on the metal belt.
  • the steel brush may be located, as the felt washing device, freely on the belt loop of the calender, but the principal location would, however, be after the nip, in accordance with point 10 in Figure 2 .
  • the steel brush cleaner may be located horizontally or obliquely with respect to the metal belt loop ( Figure 5 ). In conjunction with the steel brush cleaner 40 (e.g. combined with a collection trough 41) may also be placed a magnet, which collects metal dust removed from the belt.
  • Figure 8 shows yet another contacting cleaning device 80 comprising a support beam 81, to which are joined two profiles 83, 84 within each other and moving with respect to each other, with an expanding means 85, for example a pneumatic hose, between them.
  • the inner profile 83 moves with respect to the outer profile 84 towards a surface 86 to be cleaned.
  • a cleaning means 82 is attached to the inner profile 83.
  • the cleaning means may be, for example, a rubber moulding, a cord packing, etc.
  • the profiles 83, 84 are preferably of extruded aluminium due to which the need for machining is minimal and manufacturing costs are low compared with, for example, welded structures or structures bent from sheet metal.
  • Aluminium profile can be coated in different ways, thus making possible the use of a cleaning device also in hot, dirty and humid conditions.
  • the surface treatment may be, for example, anodic coating, pulverisation, different types of painting, etc.
  • the small number of parts and simple structure of the device make possible a functional and reliable implementation.
  • the cleaning device can be made relatively small and light by using aluminium profiles.
  • the cleaning pressure can be distributed evenly on account of the pneumatic or hydraulic hose, regardless of defects in the form, such as deflection, of the support beam or surface to be cleaned.
  • the cleaning means can be replaced, for example, by pulling out the profile inside and pushing a new one back after the removal of the locking means at the end, such as a locking pin. Due to the light and compact structure, the device can be made an oscillating one by installing, for example, a linear guide between the cleaning device and the support beam.
  • Figures 8A and 8B describe a cleaning device comprising a beam 120 implemented as a suction box, to which is connected a tube-loaded doctor blade part 121.
  • the beam is turned by means of hydraulic cylinders 124 between a cleaning position, in which the doctor blade settles against the metal belt 2, and a free position in which the doctor blade is at a distance from the surface of the metal belt.
  • the interior of the beam is connected to an external suction source (not shown) through a suction inlet 123 for collecting fine dust.
  • bristles 125 On the upper part of the beam are arranged bristles 125 which prevent the belt from contacting the beam and also improve the suction effect.
  • On the inside of the beam is preferably arranged a magnet 126 for collecting metal particles.
  • FIG. 8C shows a variation of Figures 8A and 8B , where a rotating brush 127, which may be oscillating, has been incorporated inside the beam. This type of brush enhances the cleaning of dents in the belt.
  • the belt loop of the metal belt calender is cleaned by spraying washing solution, steam or compressed air 54 under pressure from a washing device 50 ( Figure 9 ).
  • the solution may be a solvent (volatile or non-volatile), for example water or other washing solution, or for example, dry ice, the cleaning effect of which is based on the thermal shock phenomenon.
  • From the washing device may also be sprayed steam which will heat the metal belt and at the same time detach dirt particles. Compressed air may be used in the same manner.
  • a collection trough 53 which will collect excess humidity and/or a hood 52, the purpose of which is to prevent liquid/drops/steam from spreading into other parts of the apparatus.
  • a suction device for collecting drops/steam.
  • a doctor blade 51 which will dry the surface of the belt (e.g. a plastic blade). The position and manner of location are the same as in the contacting methods.
  • Non-contacting washing methods may be used either intermittently or continuously.
  • the substance being sprayed/injected may also be a solid substance, for example, washing granules that clean the belt.
  • the cleaning of the belt is based on, for example, ultrasonic vibration or other strong oscillation of the belt.
  • the impurities on the belt are detached and can be collected into a collection trough.
  • Figure 10 shows a figure in principle of incorporating metal belt loops H1 and H2 to the start and end of a multi-nip calender.
  • the belt loop H1 forms a lengthened preheating zone and the belt loop H2 forms a lengthened final cooling zone.
  • W1 and W2 illustrate alternative web draws to the calender, and W' illustrates a route suitable for a matt run.
  • Figure 11 shows an example of a Twin-Line calender with added preheating and cooling metal belt loops H.
  • Figure 12 shows diagrammatically a Yankee cylinder 100, around which the fibrous web W travels.
  • An impression cylinder 101 causes the web to remain in contact with the surface of the cylinder 100.
  • Figure 13 shows the use of the processing apparatus with a metal belt loop as an apparatus replacing the Yankee cylinder, preferably as a smoothing apparatus.
  • a metal belt 102 rotates around guide rolls 105, 106.
  • Rolls 103 and 104 form a press nip for bringing the fibrous web W into contact with the metal belt 102.
  • 103a is a press roll which forms a second press nip with the guide roll 106.
  • the apparatus may include a wire loop (not shown) which presses the web W against the metal belt 102.
  • a metal belt loop formed by a metal belt is arranged to travel around the last drying cylinder 110 in a dryer section and a guide roll 112. Press rolls that press the fibrous web against the metal belt loop are marked with reference numeral 111.
  • the apparatus may include a wire loop (not shown) which presses the web W against the metal belt.
  • Reference numeral 113 denotes a pulper.
  • the processing apparatus comprising a metal belt can replace current precalendering and/or final calendering solutions for all board grades.
  • the board may have the following properties:
  • the coating method may be any one of, for example, the following: blade coating, sizer, curtain coating, spray, or any combination of these in multi-layer coated grades.
  • Metal belt precalendering is preferably carried out in such a way that the board web is led between a thermo roll and the metal belt.
  • the metal belt may also be against a soft roll.
  • Calendering preferably takes place in one stage. Both the metal belt and the thermo roll may be heatable.
  • the metal belt calender can be used as a final calender after the dryer section and/or on the dryer section.
  • Typical process conditions on a metal belt calender are as follows:
  • the metal belt final calendering is preferably carried out so that the board web is led between a soft-surface roll and a metal belt. It is also possible to finally calender the board between a thermo roll and a coated metal belt. To obtain even gloss and printing ink absorption, a soft surface must be used on the nip, which adapts to variation in the formation scale. Calendering preferably takes place in two stages. However, if necessary, the metal belt final calendering may also be carried out on a metal-surface thermo roll and a metal-surface belt.
  • Typical process conditions on a metal belt calender include:
  • the metal belt calender By means of the metal belt calender there is provided an efficient nip, where it is possible to process both sides of the web in one nip. Furthermore, effective control of unequal sidedness by using heat or humidification is possible.
  • a metal belt calender By means of a metal belt calender it is in addition possible to replace a part of the dryer section or to increase the speed of the board machine. Strength properties are improved in metal belt calendering compared with conventional calendering methods and good large-scale smoothness is obtained compared with a machine calender or soft calender (low Bendtsen roughness).

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Claims (17)

  1. Faserstoffbahnbearbeitungsgerät (1) für verschiedene Verwendungen in einer Papier-/Kartonmaschine, wobei das Bearbeitungsgerät (1) ein Metallband (2) aufweist, das eine Schleife ausbildet und sich um zumindest eine Führungseinrichtung (3) dreht, wobei das Gerät (1) eine oder mehrere Bearbeitungszonen aufweist, wonach die Kontaktzeit einer Faserstoffbahn (W) mit dem Metallband (2) innerhalb des Bereichs von 10 bis 1000 ms liegt, und die Temperatur des Metallbands (2) innerhalb des Bereichs von 20 bis 400 °C liegt, dadurch gekennzeichnet, dass das Verhältnis der Länge des Metallbands (2) zu dessen Breite größer als 0,8 ist.
  2. Bearbeitungsgerät (1) nach Anspruch 1, dadurch gekennzeichnet, dass das Verhältnis größer als 1 ist.
  3. Bearbeitungsgerät (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass die zumindest eine Führungseinrichtung (3) innerhalb der Metallbandschleife eine heizbare Walze, bevorzugt ein Trockenzylinder, ist, deren/dessen Durchmesser innerhalb des Bereichs von ungefähr 1000 bis ungefähr 2000 mm liegt.
  4. Bearbeitungsgerät (1) nach einem der vorangegangenen Ansprüche, dadurch gekennzeichnet, dass in Verbindung mit der Metallbandschleife eine Reinigungseinrichtung (30; 40; 80; 120, 121; 50, 51) zum Reinigen der Bearbeitungsfläche des Metallbands angeordnet ist.
  5. Bearbeitungsgerät nach Anspruch 4, dadurch gekennzeichnet, dass die Reinigungseinrichtung (30; 40; 80; 120, 121; 50, 51) aus einer Gruppe ausgewählt wird, die einen Filzreiniger (30), einen Bürstenreiniger (40), eine mechanische Reinigungsvorrichtung (80; 120; 121), die mit einer Gummiform oder einer anderen Reinigungseinrichtung vorgesehen ist, die an der zu reinigenden Fläche angeordnet ist, eine Reinigung durch Sprühen von einer Waschlösung, Dampf oder verdichteter Luft unter Druck aus einer Waschvorrichtung (50), und eine Reinigung auf Grundlage einer Ultraschallschwingung oder einer anderen Oszillation des Bands (2) umfasst.
  6. Papier-/Kartonherstellungslinie, die zumindest zwei Bearbeitungsgeräte (1) nach einem der vorangegangenen Ansprüche aufweist, wobei die zumindest zwei Bearbeitungsgeräte (1) an zumindest zwei verschiedenen Stellen in der Papier-/Kartonherstellungslinie angeordnet sind, wobei die zumindest zwei Bearbeitungsgeräte (1) zumindest 40 % identische, auswechselbare Teile haben.
  7. Papier-/Kartonherstellungslinie nach Anspruch 6, dadurch gekennzeichnet, dass es zumindest 70 % auswechselbare Teile gibt.
  8. Verwendung eines Bearbeitungsgeräts (1) nach einem der vorangegangenen Ansprüche als Ersatz für einen Yankee-Zylinder (100) in einer Papier-/Kartonmaschine.
  9. Verwendung eines Bearbeitungsgeräts (1) nach einem der Ansprüche 1 bis 7 in einem Kalander, der aus einer Gruppe ausgewählt wird, die einen Mehrspaltkalander, einen Softkalander und einen Schuhkalander umfasst.
  10. Verwendung eines Bearbeitungsgeräts (1) nach einem der Ansprüche 1 bis 7 zum Vorkalandrieren, wobei in dem Gerät (1) außerhalb des Metallbands (2) eine Thermowalze (5) angeordnet ist, die eine Kontaktfläche mit dem Band (2) derart ausbildet, dass zwischen dem Band (2) und der Thermowalze (5) eine Bahnbearbeitungszone ausgebildet ist, durch die die zu bearbeitende Bahn (W) geführt wird, wobei die Prozessbedingungen wie folgt sind:
    - Kontaktzeit mit dem Metallband (2) beträgt 10 - 1000 ms,
    - Last auf eine optionale, zumindest eine zusätzliche Lastwalze (4), die innerhalb der Metallbandschleife (2) angeordnet ist, zum Pressen des Bands (2) gegen die Thermowalze (5) beträgt 0 - 400 kN/m, wobei die zusätzliche Lastwalze (4) eine harte oder eine weiche Walze ist,
    - Metallbandtemperatur beträgt 20 - 400 °C,
    - Thermowalzentemperatur beträgt 20 - 400 °C,
    - Bahnfeuchtegehalt beträgt 1 - 50 %.
  11. Verwendung nach Anspruch 10, dadurch gekennzeichnet, dass die Kontaktzeit 20 - 40 ms beträgt, dass die Last, die durch die optionale, zumindest eine Walze vorgesehen wird, 15 - 100 kN/m beträgt, dass die Metallbandtemperatur 150 - 200 °C beträgt, dass die Thermowalzentemperatur 150 - 200 °C beträgt, und dass der Bahnfeuchtegehalt 8 - 15 % beträgt.
  12. Verwendung eines Bearbeitungsgeräts (1) nach einem der Ansprüche 1 bis 7 zum Endkalandrieren, wobei in dem Gerät (1) außerhalb des Metallbands eine Thermowalze (5) angeordnet ist, die eine Kontaktfläche mit dem Band (2) derart ausbildet, dass zwischen dem Band (2) und der Thermowalze (5) eine Bahnbearbeitungszone ausgebildet ist, durch die die zu bearbeitende Bahn (W) geführt wird, wobei die Prozessbedingungen wie folgt sind:
    - Kontaktzeit mit dem Metallband (2) beträgt 10 - 1000 ms,
    - Last auf eine optionale, zumindest eine zusätzliche Lastwalze (4), die innerhalb der Metallbandschleife (2) angeordnet ist, zum Pressen des Bands (2) gegen die Thermowalze (5) beträgt 0 - 400 kN/m,
    - Metallbandtemperatur beträgt 20 - 400 °C,
    - Thermowalzentemperatur beträgt 20 - 400 °C,
    - Bahnfeuchtegehalt beträgt 1 - 50 %.
  13. Verwendung nach Anspruch 12, dadurch gekennzeichnet, dass die Kontaktzeit 60 - 200 ms beträgt, dass die Last, die durch die optionale, zumindest eine Walze vorgesehen wird, 15 - 100 kN/m beträgt, dass die Metallbandtemperatur 150 - 200 °C beträgt, dass die Thermowalzentemperatur 150 - 200 °C beträgt, und dass der Bahnfeuchtegehalt 8 - 15 % beträgt.
  14. Verwendung nach einem der Ansprüche 10 bis 13, dadurch gekennzeichnet, dass das Bearbeitungsgerät (1) zumindest zwei Bearbeitungszonen aufweist.
  15. Verwendung nach einem der Ansprüche 10 bis 14, dadurch gekennzeichnet, dass die zu bearbeitende Bahn ein beschichteter Faltschachtelkarton (FBB) ist.
  16. Mehrspaltkalander zum Kalandrieren einer Faserstoffbahn (W) in einer Papier-/Kartonmaschine, wobei eine verlängerte Kontaktzone in dem Kalander zum Verbessern der Wärmeübertragung der Bahn (W) durch Hinzufügen einer Bandschleife (H1) an einer Außenseite einer Walze des Kalanders derart aufgenommen wird, dass eine verlängerte Vorheizzone unmittelbar vor den Spalten des Kalanders ausgebildet wird, wodurch ein Vorheizeffekt erreicht wird, dadurch gekennzeichnet, dass die Bandschleife (H1) eine Metallbandschleife ist, und dass das Verhältnis zwischen der Länge des Bands (2) in der Metallbandschleife (H1) und dessen Breite größer als 0,8 ist.
  17. Mehrspaltkalander zum Kalandrieren einer Faserstoffbahn (W) in einer Papier-/Kartonmaschine, wobei eine verlängerte Kontaktzone in dem Kalander zum Verbessern der Wärmeübertragung der Bahn (W) durch Hinzufügen einer Metallbandschleife (H2) an einer Außenseite einer Walze des Kalanders derart aufgenommen wird, dass eine verlängerte Endkühlzone nach den Spalten des Kalanders ausgebildet wird, dadurch gekennzeichnet, dass das Verhältnis zwischen der Länge des Bands (2) in der Metallbandschleife (H2) und dessen Breite größer als 0,8 ist.
EP05775185.1A 2004-09-02 2005-08-24 Faserbahnverarbeitungsvorrichtung mit metallbandschleife Not-in-force EP1784535B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20045321A FI20045321A (fi) 2004-09-02 2004-09-02 Metallihihnakierrolla varustettu kuiturainan käsittelylaite
PCT/FI2005/050299 WO2006024695A1 (en) 2004-09-02 2005-08-24 Fibrous web processing apparatus with a metal belt loop

Publications (3)

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EP1784535A1 EP1784535A1 (de) 2007-05-16
EP1784535A4 EP1784535A4 (de) 2012-03-07
EP1784535B1 true EP1784535B1 (de) 2017-10-04

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FI (1) FI20045321A (de)
WO (1) WO2006024695A1 (de)

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FI120884B (fi) * 2006-02-01 2010-04-15 Metso Paper Inc Menetelmä paperi-/kartonkikoneessa tai jälkikäsittelykoneessa valmistettavan/käsiteltävän kuiturainan pinnan laatuominaisuuksien profiloimiseksi CD-suunnassa sekä hiomalaite paperi-/kartonkikoneen tai jälkikäsittelykoneen metallihihnaa käyttävän laitteen metallihihnan hiomiseksi
FI121433B (fi) * 2006-03-28 2010-11-15 Metso Paper Inc Menetelmä päällystetyn paperin tai kartongin valmistamiseksi
FI122859B (fi) * 2006-05-09 2012-08-15 Metso Paper Inc Menetelmä ja laitteisto paperin/kartongin pintakäsittelemiseksi
FI120408B (fi) * 2006-06-06 2009-10-15 Metso Paper Inc Käsittelylaite päällystetyn tai päällystämättömän kuiturainan käsittelemiseksi
FI20065447L (fi) * 2006-06-28 2007-12-29 Metso Paper Inc Paperi- tai kartonkikoneen puristinosa
DE102008000021A1 (de) 2008-01-09 2009-07-16 Voith Patent Gmbh Verfahren zur Reduzierung des Verschleißes eines endlos umlaufenden Bandes in einer Maschine zur Herstellung von Faserstoffbahnen und Vorrichtung zur Behandlung einer Faserstoffbahn
DE102008040247A1 (de) 2008-07-08 2010-01-14 Voith Patent Gmbh Bandkalender
DE102010029617A1 (de) * 2010-06-02 2011-12-08 Voith Patent Gmbh Verfahren zur Herstellung einer gestrichenen, mehrlagigen Faserstoffbahn
DE102011076622A1 (de) 2011-05-27 2012-11-29 Metso Paper, Inc. Behandlungsvorrichtung für eine faserstoffbahn, insbesondere papier- oder kartonbahn, sowie ein verfahren zum behandeln einer faserstoffbahn
DE102011081427A1 (de) 2011-08-23 2013-02-28 Metso Paper, Inc. Vorrichtung und Verfahren zur Bearbeitung einer Faserbahn
DE102011082238A1 (de) 2011-09-07 2013-03-07 Metso Paper, Inc. Vorrichtung zum Reinigen eines Bands
DE202012004002U1 (de) 2012-04-24 2012-07-03 Metso Paper, Inc. Vorrichtung zur Bearbeitung einer Faserbahn
EP2682521A1 (de) * 2012-07-04 2014-01-08 Metso Paper Inc. Verfahren und Vorrichtung zur Behandlung von Faserbahnen
DE102012216579A1 (de) 2012-09-17 2014-03-20 Metso Paper, Inc. Vorrichtung zum Behandeln einer Faserbahn
DE102012219518A1 (de) 2012-10-25 2014-04-30 Metso Paper, Inc. Vorrichtung zum Behandeln einer Faserbahn
EP3164542A1 (de) * 2014-07-02 2017-05-10 Voith Patent GmbH Verfahren zur herstellung von flüssigkeitskarton, vorrichtung zur herstellung von flüssigkeitskarton und flüssigkeitskarton hergestellt nach diesem verfahren

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FI20000671A0 (fi) * 2000-03-22 2000-03-22 Valmet Corp Moninippikalanteri ja kalanterointisovitelma
US20060060322A1 (en) * 2002-01-29 2006-03-23 Mika Viljanmaa Processing device for processing a coated or uncoated fibrous web
FI20020159A (fi) * 2002-01-29 2003-07-30 Metso Paper Inc Pinnan muokkauslaite ja laitetta käyttävä menetelmä päällystetyn tai päällystämättömän kuiturainan viimeistelemiseksi
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Publication number Publication date
FI20045321A (fi) 2006-03-03
WO2006024695A1 (en) 2006-03-09
FI20045321A0 (fi) 2004-09-02
EP1784535A4 (de) 2012-03-07
EP1784535A1 (de) 2007-05-16

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