EP1974095A1 - Arrangement et procedes pour augmenter la productivite d'une machine a papier ou pour reduire ses dimensions - Google Patents

Arrangement et procedes pour augmenter la productivite d'une machine a papier ou pour reduire ses dimensions

Info

Publication number
EP1974095A1
EP1974095A1 EP06813019A EP06813019A EP1974095A1 EP 1974095 A1 EP1974095 A1 EP 1974095A1 EP 06813019 A EP06813019 A EP 06813019A EP 06813019 A EP06813019 A EP 06813019A EP 1974095 A1 EP1974095 A1 EP 1974095A1
Authority
EP
European Patent Office
Prior art keywords
roll
rolls
machine
lightweight
steel
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Withdrawn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
EP06813019A
Other languages
German (de)
English (en)
Other versions
EP1974095A4 (fr
Inventor
Krister Aspegren
Rune Skogsberg
Rolf Jonsson
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 AB
Original Assignee
Metso Paper Karlstad AB
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 Karlstad AB filed Critical Metso Paper Karlstad AB
Publication of EP1974095A1 publication Critical patent/EP1974095A1/fr
Publication of EP1974095A4 publication Critical patent/EP1974095A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/36—Guiding mechanisms
    • D21F1/40—Rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D21F11/145—Making cellulose wadding, filter or blotting paper including a through-drying process
    • 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
    • D21F3/08—Pressure rolls
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G1/00—Calenders; Smoothing apparatus
    • D21G1/02—Rolls; Their bearings

Definitions

  • the present invention relates to an arrangement and methods for increasing productivity of a papermaking machine by increasing the operation speed, minimising vibrations and/or decreasing the machine dimensions in a cost efficient way with unchanged productivity.
  • the machine productivity the amount of paper that could be produced during a given time, depends on a number of factors such as a width of the machine and its processing speed.
  • the increasing of the machine width could create a number of technical problems depending on the increasing weights of all machine elements, particularly, rotating elements such as rolls mounted on a machine frame. Those elements due to rotating of high masses at a high speed cause vibrations, and, as a consequence, these vibrations limit the increase of the operation speed and the production of the entire machine.
  • the problem is described in PCT/FI2005/050092 publication and solved by a special roll construction.
  • the conventional paper machine comprises a large amount of different rotating elements such as different rolls supporting paper webs of different grades and qualities and a board webs and/or the paper machine clothing used for paper manufacturing purpose in the different paper machine sections.
  • the different rolls have different functions and different placements in the machine sections as will be described below.
  • Guide or leading rolls are used for support of the paper web or the machine clothing or used for changing the direction of movement of the web, the wire, the fabric or the felt.
  • the guide rolls support a number of fabrics used for paper web manufacturing in a forming section, in a dewatering section, in a press section, a drying section and, alternatively in a winding section.
  • Tension rolls are the guide rolls that automatically regulate the tension of the wire or the other kind of papermaking clothing. Stretching rolls are used as the adjustable guide rolls, which stretch the felt or the wire so that the tension roll can achieve its purpose.
  • Alignment rolls are adjustable guide rolls for guiding the wire or the felt.
  • a forming roll or a breast roll is a guide roll supporting the wire in the forming section of a fourdinier, a twin wire or another former types, and changes the direction of movement of the wire immediately prior to the forming zone.
  • Press rolls are used in a roll press or as a transfer roll for transferring the paper web from one surface to the other for further proceeding.
  • All conventional rolls as described above have different functions but generally have more or less the similar design with a very few exceptions, like suction press rolls, and usually comprise two flanges having shafts for mounting of the roll on a machine frame via a bearing house or other suitable means and a shell connecting those flanges in one peace of equipment.
  • the shell could be connected to the flanges in many different ways that are not to be discussed here.
  • the shell thickness could widely vary, and usually the roll is hollow inside in order to decrease its weight.
  • All conventional rolls as mentioned above are made of metal, usually of steel. The nowadays papermaking machines can be run at about 800-1200m/min up to maximum about 2200 m/min.
  • the conventional steel guide roll can weigh from 900 up to 10 000 kilogram depending on its length, that could be between 1 and 9 m, and the diameter between 300 and 1200 mm.
  • the vibrations occur in the different sections of the paper machine due to rotating of the different elements such as dry cylinders, guide rolls, leading rolls, a forming roll and the like.
  • the vibrations could be transferred through the entire machine via a frame, on which the rotating elements are mounted, and through the clothing running about the rotating elements in the loop or through the machine foundation.
  • the traditional solution of the problem with bending of the roll is to increase the diameter of the steel roll for achieving a higher stiffness and a higher critical speed.
  • the frame modifications are not always desired also due to a down time and a loss of the production, rather costly due to material costs.
  • the present invention provides a solution to the problems associated with the own frequencies of the rotating rolls, the vibration caused by their rotation at high speed as mentioned above and allows substantially increase of the operation speed.
  • the invention allows decreasing the machine dimensions for a given process speed comparing to the conventional solutions in a cost efficient way. .
  • the best way to reduce the undesired excitation forces is a reduction of the rotating mass, for instance by using a lightweight material.
  • Stainless steel has a density of about 7800 kg/m 3
  • titan is about 4500 kg/m 3
  • aluminium is about 2700 kg/m 3
  • the composite materials like carbon or glass fibre reinforced resin or other polymer, have density between 1500 and 2000 kg/m 3 .
  • the roll made of the composite material with the same diameter as the steel roll will weigh only about 20 -30% of the steel roll weight. Thus, an essential reduction of the weight of the roll will lead to the essential reduction of the excitation forces and vibrations that this roll will cause due to its rotation.
  • the present invention is directed to use of lightweight rolls for guiding and/or supporting wires, fabrics or other clothing in a papermaking machine.
  • the lightweight rolls made of lighter materials with the required bending and rigidity parameters could be of the smaller, the same or even larger diameter than the conventional metal rolls, usually made of steel.
  • the lightweight roll of composite material with lager diameter may weigh less than the corresponding steel roll with larger diameter, and therefore it might be possible to use even larger composite rolls and still achieve a reduction of the excitation forces.
  • the lighter weight of the rolls allows increasing of the rotating speed of the rolls without increasing the corresponding critical vibrations and as a result, increasing the speed of the operation.
  • the roll according to the invention may have one of the shell and the flanges made of the lightweight material or the both parts thereof. Alternatively, the entire roll could be made as one piece from the lightweight material by conventional methods as moulding, powder pressing or the like.
  • This invention allows increasing of the operation speed of the papermaking machine and, thus, increasing the total productivity for a new machine for the chosen machine width and footprint.
  • the invention concerns also are-build of an existing machine for increasing the production speed due to usage of the lightweight rolls in the existing space.
  • the lightweight rolls for higher speeds made of the composite materials do not require the roll diameter increase and the machine frame modifications, as they can be. dimensioned to the same diameter as the original conventional steel rolls.
  • An object of the invention is to decrease the paper machine vibrations due to decreasing the weight of the rolls.
  • Still another object of the invention is increasing a possible machine production by increasing the possible rotating speed of the rolls supporting the clothing.
  • Still another object of the invention is reducing the machine dimensions for a given operation speed comparing to the conventional solutions with unchanged productivity.
  • a paper machine comprises a number of different process sections such as a forming section, a dewatering section, a drying section and a winding section.
  • Each section comprises at least one paper manufacturing clothing and a plurality of rotary rolls.
  • Each of the roll comprises two flanges and a shell interconnecting the flanges. The shell is supporting the clothing. The clothing runs about the rolls in a loop.
  • the diameters of the rolls are dimensioned for the required calculated load, bending and rotating speed, hi at least one of the machine sections, at least one of the shell and/or the flanges of the at least one rotary roll, is made of a material with a density less than steel and thus providing the roll with a lower weight comparing to the corresponding roll having the same dimensions made of steel.
  • the lower density of the alternative material provides rolls with decreased weight per length unit for the same roll dimensions.
  • the weight of the lightweight roll should be at least 10% less comparing to the weight of the corresponding steel roll having approximately the same dimensions and the same mechanical parameters. At least one roll, or preferably at least 10 % of all rolls in at least one of the machine sections should be exchanged from the steel rolls to the rolls according to the invention in order to achieve a visible effect on vibration level in the machine and allow higher operation speed.
  • a method of increasing an operation speed of a paper machine having at least a forming section, a dewatering section, a drying section and a winding section, each section comprising at least one paper manufacturing clothing and a plurality of rotary rolls, each of the rolls comprising two flanges and a shell interconnecting the flanges and supporting the clothing, the clothing is running about the rolls in a loop, comprises the step of substituting the shell and /or flanges of a conventional steel rotary roll or the entire roll by the shell and/or flanges or the entire roll made of a material having less density than steel and the same mechanical parameters such as bending and stiffness for the required dimensions.
  • a method of using a lightweight roll such as a leading roll, a stretching roll or the like in a papermaking machine is implemented by substituting at least one conventional steel rotary roll, preferably at least 10% of a total amount of all rotary rolls, the roll having a shell and two flanges interconnected by the shell in a hollow cylindrical body, by a rotary roll having at least 10% less weight than the corresponding steel roll with same bending and other mechanical parameters for guiding and/or supporting wires, fabrics or other clothing in at least one section of the papermaking machine.
  • a method of minimising dimensions of a papermaking machine for a given process speed comprises a step of substituting at least one conventional steel rotary roll, preferably between 10 - 100% of the total amount of the all rotary rolls, in at least one section of the papermaking machine by a lightweight rotary roll or rolls having at least one of the shell and the two flanges made of a material with density less than steel while the roll has the same mechanical parameters.
  • a method for decreasing vibrations that occur in a papermaking machine at an increasing of an operation speed where the machine comprises a number of different process sections, each section comprising at least one paper manufacturing clothing and a plurality of steel rotary rolls, each of the rolls has two flanges and a shell interconnecting the flanges and supporting the clothing, the clothing runs about the rolls in a loop, is implemented by substituting at least one of the shell and the flanges of the at least one conventional steel rotary roll, preferably more than 50% of the total amount of all rotary rolls, by a shell and/or flanges made of a material having less density than steel while the roll has the same mechanical parameters as the steel roll.
  • a method for a re-built of a papermaking machine within given dimension allows increasing an operation speed.
  • the paper machine comprising a number of different sections such as a forming section, a dewatering section, a press section, a drying section and a winding section.
  • Each section comprises at least one paper manufacturing clothing and a plurality of steel rotary rolls.
  • Each of the rolls has two flanges and a shell interconnecting the flanges and supporting the clothing.
  • the clothing runs about the rolls in a loop.
  • the method comprises the step of substituting at least one of the shell and the flanges of the at least one conventional steel rotary roll by a shell and/or flanges made of a material having less density than steel, while the roll has the same mechanical parameters as the steel roll.
  • Usage of the lightweight rolls which are fitting in the existing space due to their smaller diameters comparing to the corresponding steel rolls, allows conducting a re-build and speeding up of the existing paper machines.
  • guide roll or "leading roll” is used in this context not as a limiting only to the guide or leading rolls and should be interpreted as referring to the all different types of rolls or rotating elements supporting different clothing in the papermaking machine which were described above.
  • the inventive idea is to make the rotating elements as rolls, carrying and supporting wires, fabrics and other clothing or paper- and board webs, of the reduced weight comparing to the corresponding conventional steel roll with the same dimensions and mechanical parameters in such a manner that these rolls create less vibrations in the machine and allow sufficiently increase of the speed of the roll rotation and the speed of run of the supported clothing, and as a consequence, the productivity of the entire machine.
  • FIG. 1 shows a layout of a tissue machine with a C-former, a wet end, a dewatering section and a Yankee dryer.
  • the three clothing of the machine, including two forming wires and a dewatering fabric, are supported by the guide rolls according to the invention.
  • FIG. 2 shows a layout of a tissue machine with a Crescent former and two clothing and a Yankee dryer.
  • the clothing including the forming wire and the dewatering fabric are supported by the guide rolls according to the invention.
  • FIG. 3 shows a layout of a tissue machine with a Crescent former, a Yankee dryer and a winding section comprising the clothing supported by the guide rolls according to the invention.
  • FIG. 4 shows an alternative drying section comprising a Yankee dryer followed by a can dryer. In the drying section employing the drying cylinders or the cans, the drying fabric runs about the guide rolls according to the invention.
  • FIG.5 is a cross section of a roll according to the invention.
  • the roll has two flanges and a shell.
  • FIG.6A shows a cross sectional enlarged view of the conventional steel roll shell and FIG.6B - a composite roll shell.
  • FIG. 7 is a diagram showing differences in vibrations levels, [total RMS 2- 1000HZ] caused by a steel leading roll or a composite leading roll in the same position in a papermaking machine.
  • the vibrations are measured in machine direction on a bearing house of the leading roll at different machine speeds from 1200 m/min to 1600 m/min.
  • FIG.8 is a diagram showing vibrations levels, [peak values] caused by steel leading roll and composite leading roll in the same position in a papermaking machine at rotational and double rotational frequencies for the corresponding rolls.
  • the diagram shows the peak vibration levels at the rotational frequency and the double rotational ' frequency for the roll in leading roll position for the conventional steel roll (two lines above) and the lightweight roll (two lines below) according to the invention.
  • the vibrations are measured in machine direction on the bearing house of the leading roll and at the same roll position in the machine.
  • Fig.1 a layout of a machine for manufacturing a tissue paper web is illustrated.
  • the machine has a wet end 1, wherein a paper web 11 is formed in a C-former.
  • a headbox 12 delivering a paper stock between an outer forming wire 13 supported by a plurality of guide rolls 10 and an inner forming wire 14 also supported by a plurality of guide rolls 10.
  • the wires 13, 14 run over a so called forming or a breast roll 8.
  • the paper web 11 is formed on the inner forming wire 14.
  • the web 11 is partly dewatered while being between the wires 13,14 and then, the paper web 11 further transferred by a pick-up device 9 from the outer forming wire 14 to a carrying fabric 19 of a dewatering section 2.
  • the pick-up device 9 may be any one known in the art.
  • the web 11 is further dewatered in the dewatering section 2 by, for instance, known in the art vacuum suction devices of different types such as a suction box or a vacuum roll, or alternatively, by conventional pressing devices that squeezes water from the wet paper web 11 in order to increase dry content of the web 11.
  • a pre-press arrangement or a press section could be integrated into the dewatering section 2.
  • the carrying fabric 19 could be a press fabric or other type of the suitable machine clothing.
  • the dewatering section 2 is followed by a drying section 3.
  • the drying section 3 comprises a drying cylinder 5, a so called Yankee dryer 5.
  • the paper web 11 When the paper web 11 is dewatered to approximately 25-60% of dry content, it is further transferred or pressed against a drying surface of the Yankee dryer 5 by a transfer roll 6 for a final drying.
  • the different types of adhesive application devices might be employed (not shown).
  • the web 11 could be only transferred to the Yankee dryer for a contact drying without any sufficient compression of the web 11 or, alternatively, the paper web 11 could be pressed against the Yankee dryer 5 by a press device, comprising the Yankee cylinder 5 and a press roll 6 or 7, for instance.
  • the alternative additional press arrangement in the dewatering section 2 is not shown while it could be also used for pre-pressing or structuring of the web 11.
  • the carrying fabric 19 used as a dewatering or a press fabric and carrying the web to the drying section 3 runs about a plurality of the rotary guide and stretch rolls 10.
  • a roll 6 is used as a transfer roll or as a press roll, and a roll 7 is used for increasing the paper web dryness, when transferred to a Yankee dryer 5 for the final drying of the paper web 11 in the drying section 3.
  • At least a part of the guide , leading- or stretch rolls 10 supporting the carrying fabric 19 in the dewatering section 2 are lightweight rolls 10 according to the invention made of the composite material, which are inserted instead of the conventional steel guide rolls.
  • the machine fabric could be run at higher speeds, that in its turn, influences the machine productivity.
  • at least one, or preferably at least 10% of all guide rolls should be inserted by the lightweight rolls. The more visible effect could be achieved when more than 50% of the rotary steel rolls are inserted by the corresponding lightweight rolls 10.
  • the lightweight roll 10 according to the invention should have the weight at least 10 % less than the corresponding steel roll with the same mechanical properties, preferably the lightweight roll weight should be reduced by at least 20-30% of the corresponding steel roll weight, and most preferably by 60-80% of the corresponding steel roll weight remaining the required mechanical properties as of the corresponding steel rolls.
  • the decrease of the roll weight is achieved by use of alternative materials having a density . lower than the steel density.
  • such materials could be lightweight metal such as titan, aluminium and the like.
  • the other alternative is composite materials comprising a glass or carbon reinforcing fibre and a resin matrix.
  • other suitable materials such as ceramic and the like with the lower density and suitable mechanical properties cold be used for manufacturing such lightweight rolls.
  • the conventional steel guide or leading rolls in the wet end 1 could be replaced by the lightweight rolls 10 as described above in the loops of the inner, the outer or both of the forming wires 13,14.
  • Fig. 2 shows a modified tissue paper machine layout with a Crescent-former in the wet end 1.
  • the wet end 1 comprises an outer forming wire 13 and a fabric 19.
  • Each of the forming wire 13 and the fabric 19 run about a plurality of guide and/or stretch rolls 10, at least one of those rolls 10 is substituted by the lightweight roll according to the invention.
  • the fabric 19 carries the formed paper web 11 through the dewatering section 2 from the wet end 1 to the drying section 3 for the final drying on the Yankee dryer 5.
  • the dewatering section 2 could alternatively comprise also a press device (not shown).
  • the Fig. 3 illustrates a further modified tissue paper machine layout with a Crescent- former having the wet end 1, the dewatering section 2 and the drying section 3.
  • the drying section 3 is followed by a winding section 4, wherein the finally dried paper web 11 is creped from the Yankee dryer 5 drying surface by a doctor and further transported from the Yankee dryer 5 to a reel-up device for winding the paper web 11 into a paper roll 18.
  • the tissue paper web 11 is supported by a support clothing 21 that runs about a plurality of the guide rolls 10.
  • the web 11 could be calendered by a calender (not shown) prior to winding into the roll 18.
  • the clothing 21 could be any suitable fabric, including a TAD-fabric, if a TAD-unit is used after the Yankee dryer for the final drying of the tissue web 11.
  • the reel-up device could be of any known type and will not be discussed closer here.
  • the rolls 10 are the guide-, leading rolls and /or the stretch rolls according to the invention and made of the lightweight material or a composite material. At least some of them do not have a special drive (not shown) for rotation and being driven by the moving fabric 19.
  • the composite material of the rolls 10 is preferably made of a carbon fibre reinforced resin, but other compounds could be used instead of resin as well as other kind of reinforcing fibres.
  • the lightweight or composite rolls 10 alternatively could be made by known in the art the conventional casting- or moulding methods.
  • the conventional steel guide- or leading rolls in the winding section 4 could also be replaced by the lightweight rolls 10.
  • Fig. 4 illustrates still another embodiment of the papermaking machine having a modified drying section 3.
  • the drying cylinder 5 (so called Yankee dryer 5) is followed by a number of drying cylinders 20 or cans for the final drying of the paper web 11.
  • the drying section 3 could exclude the Yankee dryer 5 and comprise only the drying cylinders 20 for drying the paper or board webs.
  • the web 11 is supported by a support or drying fabric 22 that presses the web 11 towards the drying cylinder 20 drying surface.
  • the fabric 22 runs about a plurality of the guide rolls 10 according to the invention.
  • the web 11 is wound into the paper roll 18 in the winding section 4 of the known type.
  • the conventional steel guide or leading rolls in the drying section 3 could be replaced by the lightweight rolls 10 according to the invention.
  • FIG. 5 a sectional view of a lightweight roll according to the invention is illustrated.
  • the roll 10 has two flanges 15 with shafts 16 adopted to be rotary mounted into a bearing house or in any other suitable manner.
  • the roll 10 has also a roll shell 17 interconnecting these flanges 15 into one piece of the equipment.
  • the roll shell 17 is adopted to support the paper web 11 or different clothing used into the papermaking machine.
  • the roll shell 17 can be mounted to the flanges in any suitable known way.
  • One of the flanges 15 and/or roll shell 17 might be made of the material having density less than steel in order to reduce the total weight of the roll 10 for about 10- 90%.
  • the roll 10 might be made from the known alternative lower density lightweight materials, such as composites and/or plastics, as a whole by the suitable known manufacturing methods like moulding, extruding or the like, and therefore will have the shell 17 being integrated with the flanges 15 in one piece.
  • the roll 10 according to the invention is a hollow roll, but when manufactures from the lower density lightweight materials, such as, for instance, composite material or plastics, the roll 10 might have a solid design.
  • Fig. 6 A illustrates a cross sectional view of the guide roll having the conventional steel shell 17 and Fig. 6 B - a composite shell 17 for the corresponding lightweight roll 10 made of composite material, partly or entirely.
  • the shell 17 of the roll 10 made of the composite material having the lower density than steel the shell 17 might have alternatively the same or different thickness and outer diameter comparing to the corresponding conventional heavier steel roll shell with the same mechanical properties.
  • These mechanical properties depend on the calculated required mechanical parameters required for the stabile roll 10 performance in the particular place into the papermaking machine.
  • the required parameters for the lightweight roll 10, substituting the steel roll, such as bending, stiffness, critical speed, inertia, possible maximum rotation speed, vibration, residual unbalance and the required dimensions could be calculated by the known methods.
  • the rolls 10 can be made, partly or entirely, of light ceramics by the precise pressing or other conventionally known technologies.
  • the lightweight metals like titanium and aluminium could also be used for the manufacturing of the lightweight rolls for papermaking machine. These methods preferably should be of land precise casting and preferably avoiding the additional working of the rolls' surfaces.
  • the lightweight roll 10 may have a special cover layer of its surface for achieving particular surface qualities.
  • the composite rolls according to the invention due to its good weight-to-stiffness ratio have a very small deflection and high nominal frequencies of vibration; they can have weight of 10-20% of the corresponding steel roll and could have smaller diameter for the same application. Those rolls are easy to handle, to transport and store.
  • the roll shell made of other than metal material has another requirements in regard to assembling of the composite shell to the metal roll shafts, but this constructive difference will not be discussed here. It has been noted, for instance, that decreasing of the guide roll weight allows sufficiently increase of the rotating speed of the roll before it reaches the critical speed, and lighter rotary elements create less vibrations due to their lower residual unbalance forces.
  • the composite rolls do not have 1 A critical speed limitation, as the manufacturing methods allow achieving a perfect circular cross section of the roll shell. So, the composite rolls have higher critical speed and allow run to almost 1/1 critical speed.
  • the weight of the rotary rolls could be decreased up to 80 - 10 % of the weight of the corresponding steel rolls of the same diameter. It has been tested and approved that the lightweight roll with about 20% weight of the conventional steel roll of the same diameter could increase the rotation speed up to the double critical speed comparing to the conventional steel roll without reaching the own critical speed, see the formula (2) below, and do not create the corresponding undesired vibrations due to higher residual unbalance forces as illustrated by Fig. 7 and Fig. 8.
  • the machine frame modifications are not required in the case, when the higher rotation speed is required and achieved by the lightweight rolls, that saves investment costs.
  • the roll change is easier to conduct due to lighter weight of the rolls, therefore the down time for their mounting is shortened also.
  • the reference steel roll having a diameter of 650 mm has a weight of about 4 000 kg, while the roll made of the composite material with same diameter of 650 mm has a weight of only 800 kg.
  • the lighter the rotating element the lower will be the corresponding excitation forces for the element having the same stiffness; the higher the critical speed of the rotating element, when the undesired vibrations occur, the higher speed of rotation is possible for the element and thus, a higher process speed for the entire machine could be achieved. Therefore, with the lighter rotating elements such as the guiding, stretching or leading rolls carrying and supporting the clothing or the paper web, for instance, the machine speed could be increased up to 3000 m/min or more. ⁇
  • the composite roll Due to its lighter weight, the composite roll has a low moment of inertia and as a consequence, a lower power consumption that also saves costs. This saves investment and maintenance costs.
  • the material for manufacturing the lightweight rolls could be chosen from the different composite materials, such as among others a fibre reinforced composite or resin, and/or ceramics. These materials are very resistant to the most of chemicals. These rolls could be moulded very accurately and do not require after working, machining or finishing. They could have a very exact round shape of the composite shell and excellent dimensional stability achieved by the optimal filament winding angles during manufacturing that minimises the vibrations as well.
  • a coefficient of a thermal expansion for the carbon fibre tube shell, for instance, is about 10 times less than with the corresponding steel roll in the axial direction.
  • the lightweight composite materials such as carbon or glass fibre with a polymer resin matrix, have good vibrations damping properties and high balancing accuracy. As a consequence, the rolls made of such materials have low residual unbalance and low level of vibrations over the whole operating speed range.
  • the lightweight rolls could additionally have a covering layer for achieving special surface properties.
  • vibrations caused by a steel leading roll is compared with vibrations caused by a composite leading roll used as a leading roll in the same position in a papermaking machine.
  • the steel roll and the composite roll were measured at different machine speeds. The measured results are illustrated as in the diagram. One can see that the corresponding composite rolls have the vibration level sufficiently lower at the different rotational frequencies then the corresponding steel rolls.
  • the lightweight rolls could be used in all sections of the papermaking machine: in the forming section of the paper machine as guide or leading rolls, in a drying section 3, as measuring tension rolls for control of the clothing tension or as leading, alignment and/or guide rolls for felts, fabrics or wires.
  • the lightweight rolls could be used as press rolls, as spread rolls, forming or breast rolls. When being manufactured of lightweight metal - as drying cylinders or the like.
  • the paper machine in question could be a conventional paper-, board- or tissue manufacturing machine. It is to be understood that the invention is not limited to the embodiments of the papermaking machines shown and should be interpreted in the spirit of the invention. The invention is applicable to the other types of the none-conventional paper manufacturing machines such as, for instance, so called through-air-drying (TAD) machines.
  • TAD through-air-drying

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Abstract

L’objet de l’invention consiste à réaliser les éléments rotatifs ou les rouleaux d'une machine à fabriquer du papier de tissu, avec un poids réduit comparé aux rouleaux d'acier conventionnels. De cette manière, les rouleaux créent moins de vibrations et permettent une augmentation suffisamment importante de la vitesse de fonctionnement et de la productivité de la machine entière, ou une réduction de la dimension de la machine pour une vitesse de fonctionnement donnée, comparée aux solutions conventionnelles. L'invention est applicable à la rénovation de machines existantes et à de nouvelles installations à haute vitesse.
EP06813019A 2005-12-19 2006-11-16 Arrangement et procedes pour augmenter la productivite d'une machine a papier ou pour reduire ses dimensions Withdrawn EP1974095A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0502801A SE0502801L (sv) 2005-12-19 2005-12-19 Anordning och förfarande för ökning av en pappersmaskins produktivitet eller minskning av dess dimensioner
PCT/SE2006/001299 WO2007073274A1 (fr) 2005-12-19 2006-11-16 Arrangement et procedes pour augmenter la productivite d'une machine a papier ou pour reduire ses dimensions

Publications (2)

Publication Number Publication Date
EP1974095A1 true EP1974095A1 (fr) 2008-10-01
EP1974095A4 EP1974095A4 (fr) 2013-03-20

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EP06813019A Withdrawn EP1974095A4 (fr) 2005-12-19 2006-11-16 Arrangement et procedes pour augmenter la productivite d'une machine a papier ou pour reduire ses dimensions

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US (1) US20090314447A1 (fr)
EP (1) EP1974095A4 (fr)
CN (1) CN101341291A (fr)
BR (1) BRPI0620680A2 (fr)
SE (1) SE0502801L (fr)
WO (1) WO2007073274A1 (fr)

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FI122706B (fi) * 2009-04-29 2012-05-31 Metso Paper Inc Menetelmä kuiturainakoneen ajonopeuden nostamiseksi ja kuiturainakoneen tela
SE544018C2 (en) * 2020-01-09 2021-11-02 Valmet Oy A tissue paper making machine

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WO2000037740A1 (fr) * 1998-12-21 2000-06-29 Kimberly-Clark Worldwide, Inc. Voile de papier impregne a crepage humide
WO2001088259A1 (fr) * 2000-05-18 2001-11-22 Metso Paper Karlstad Ab Machine a papier crepe et sa section presse
US20020139499A1 (en) * 2001-03-29 2002-10-03 Metso Paper Karlstad Ab Multi-reel apparatus in a paper machine

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FI111473B (fi) * 1997-10-14 2003-07-31 Metso Paper Inc Menetelmä kevytrakenteisen telan valmistamiseksi ja menetelmän mukaisesti valmistettu tela
FI103829B1 (fi) * 1998-05-14 1999-09-30 Valmet Corp Imutela
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US3593398A (en) * 1969-09-11 1971-07-20 Sw Ind Inc Relatively long machinery roll having high strength-to-weight ratio
WO2000037740A1 (fr) * 1998-12-21 2000-06-29 Kimberly-Clark Worldwide, Inc. Voile de papier impregne a crepage humide
WO2001088259A1 (fr) * 2000-05-18 2001-11-22 Metso Paper Karlstad Ab Machine a papier crepe et sa section presse
US20020139499A1 (en) * 2001-03-29 2002-10-03 Metso Paper Karlstad Ab Multi-reel apparatus in a paper machine

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Title
See also references of WO2007073274A1 *

Also Published As

Publication number Publication date
EP1974095A4 (fr) 2013-03-20
US20090314447A1 (en) 2009-12-24
BRPI0620680A2 (pt) 2011-11-22
SE0502801L (sv) 2007-06-20
CN101341291A (zh) 2009-01-07
WO2007073274A1 (fr) 2007-06-28

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