EP0943034B1 - Procede de sechage et du papier et section seche d'une machine a papier - Google Patents

Procede de sechage et du papier et section seche d'une machine a papier Download PDF

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Publication number
EP0943034B1
EP0943034B1 EP97946772A EP97946772A EP0943034B1 EP 0943034 B1 EP0943034 B1 EP 0943034B1 EP 97946772 A EP97946772 A EP 97946772A EP 97946772 A EP97946772 A EP 97946772A EP 0943034 B1 EP0943034 B1 EP 0943034B1
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EP
European Patent Office
Prior art keywords
dryer
paper web
paper
curling
web
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EP97946772A
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German (de)
English (en)
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EP0943034A1 (fr
EP0943034B2 (fr
Inventor
Pasi Ahonen
Jaakko Kallioniemi
Juha Kaihovirta
Ville Korhonen
Matti Luontama
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Valmet Technologies Oy
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Metso Paper Oy
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper

Definitions

  • the invention concerns a method for drying of paper, which method comprises the following steps:
  • the invention also concerns a dry end of a paper machine, which comprises a forward dryer section and a finishing section, which finishing section comprises a coating/surface-sizing equipment, an after-dryer, a calender, and a reeling station, and the dry end of the paper machine further comprises elements and/or assemblies and combinations formed out of said elements and at least one steam box in view of controlling the curling of the paper web at least in the area of the finishing section.
  • twin-wire draw and/or single-wire draw is/are employed.
  • twin-wire draw the groups of drying cylinders comprise two wires, which press the web one from above and the other one from below against heated cylinder faces. Between the rows of drying cylinders, which are usually horizontal rows, the web has free and unsupported draws, which are susceptible of fluttering, which may cause web breaks, in particular so when the web is still relatively moist and, therefore, of low strength.
  • each group of drying cylinders includes just one drying wire, on whose support the web runs through the whole group so that the drying wire presses the web on the drying cylinders against the heated cylinder faces, whereas on the reversing cylinders or rolls between the drying cylinders the web remains at the side of the outside curve.
  • the drying cylinders are placed outside the wire loop, and the reversing cylinders or rolls inside said loop.
  • the tendency of curling of paper is already affected in connection with the web formation, in particular at the sheet formation stage (for example, the applicant's Sym-FormerTM) by means of selection of the difference in speed between the slice jet and the wire, and by means of other running parameters.
  • the sheet formation stage for example, the applicant's Sym-FormerTM
  • a suitable initial curl form is regulated for the sheet in order that the curling of the paper after one-sided or double-sided copying could be optimized.
  • the reactivity of curling i.e. the extent to which curling occurs per unit of change in moisture content, is affected to a greater extent by means of a multi-layer structure of the paper, which is produced in connection with the web formation in the wet end.
  • the object of the present invention is to provide a dry end of a paper machine in which no inverted groups are needed at all, but which, however, meets all other requirements that are imposed.
  • the object of the present invention is to approach these problems from a new point of view and to suggest novel solutions for said problems, which solutions are contrary to conventional modes of thinking.
  • FI Patent Application No. 935340 methods in the drying of a paper web and dryer sections for a paper web are described, wherein, after the press section, the paper web is dried in a number of successive groups with single-wire draw, and according to one embodiment the paper web is dried from the side of its bottom face over the entire length by means of said contact drying cylinders, and the paper web is dried from the side of its top face on the draw or draws of the paper web free from the wire, and/or the paper web is dried from the side of its top face by to the top face of the paper web applying a drying air flow through the drying wire.
  • a method for drying a surface-treated paper web or equivalent in an after-dryer of a paper machine as well as a dryer section of a paper machine for applying the method, wherein, in view of compensating for a tendency of curling of the paper web, in the after-dryer the paper web is dried in a dryer group/groups making use of a normal single-wire draw, and that, in connection with or after the drying, the paper web is treated by means of a device/devices in order to compensate for a tendency of curling of the paper web, which devices are, for example, a steam box, a blower unit, a moistening device, and/or a soft calender.
  • devices are, for example, a steam box, a blower unit, a moistening device, and/or a soft calender.
  • FI Patent Application No. 963024 a method for drying a paper to be surface-treated, in particular fine paper, in an after-dryer in a paper machine is described as well as an after-dryer in a paper machine for carrying out the method, wherein, after the surface-sizing or coating, the paper web is dried by means of an upwards open inverted group with single-wire draw, in which connection the tendency of curling formed in the paper web in the forward dryer section can be substantially eliminated and/or compensated for.
  • the method in accordance with the invention is mainly characterized in that, in the method, the effect of said steam box is intensified by cooling the web prior to said steam box.
  • the forward dryer section in the dry end of the paper machine is exclusively based on dryer groups with single-wire draw, in which case the removal of broke takes place all the time by the force of gravity and does, thus, not cause problems.
  • the single-wire draw in the forward dryer section the paper web is constantly supported by a wire, whereby the runnability is improved and it is possible to increase the running speed.
  • both the forward dryer section and the after-dryer have been accomplished exclusively by means of dryer groups with normal single-wire draw.
  • blowing through the wire is employed for regulating the curling; from above the different cylinders hot air is blown out of impingement blow devices, and evaporation takes place through the wire and affects the drying and, thus, the curling of the paper.
  • steam boxes and possibly blowings of moist air taken from the forward dryer section are employed for controlling the curling.
  • a lower support belt has also been added to a dryer group, which belt circulates against the lower faces of the reversing rolls while guided by its own guide rolls, and which support belt is so impermeable that it prevents evaporation of water out of the web from its lower face, whereby the tendency of curling can be controlled.
  • the forward dryer section is composed of dryer groups with single-wire draw, as is the after-dryer, in the after-dryer, in view of controlling the curling
  • steam boxes have been fitted, by whose means steam with a content of energy is blown against the web in the area of the reversing cylinders.
  • one or several drying cylinders can also be cylinders with adjustable temperature, i.e. cooling/heating cylinders. Between the dryer section and a calender, there can also be an additional steam box in view of controlling the curling.
  • moist air or any other, equivalent medium such as a device that blows moist air that is brought from the forward dryer, or, for example, a separate water atomizing box, by whose means water is sprayed by means of air as small drops towards the web, or an airborne type hood to be placed underneath.
  • a what is called "spreader bar" at one side or both sides of the paper web in order to work the curling of the paper web mechanically. In this way in particular the curling of the web in the longitudinal direction is affected.
  • the spreader bar can also be of a spreader roll type, in which case the effect on cross-direction curling can be enhanced.
  • Figure 5 is a schematic illustration of an exemplifying embodiment of the invention as an illustration in part of the after-dryer of a paper machine.
  • FIGS 6A to 6C are schematic illustrations of exemplifying embodiments of the invention, in which figures the last dryer group in the after-dryer and the machine reel-up are shown.
  • FIGS 6D to 6E are schematic illustrations of exemplifying embodiments of the invention, in which figures the whole of the dry end of a paper machine is shown from the forward dryer section to the machine reel-up.
  • the paper web W is brought into the forward dryer section D1 from the press section onto the drying wire 15 of the first group R 0 with single-wire draw, to which wire the web is attached by the effect of the vacuum in the suction boxes 13.
  • the forward dryer section includes 7 groups R 0 ...r 6 with single-wire draw, and the web W has closed draws over the group gaps between said groups.
  • the machine direction i.e. the direction of progress of the of the web W is denoted with the arrow S.
  • all the groups R 0 ...R N with single-wire draw are so-called normal groups, in which the, for example, steam-heated smooth-faced drying cylinders 10 are placed in the upper horizontal row and the reversing suction cylinders 11 are placed in the lower horizontal row.
  • Each normal group R 0 ...R N has a drying wire 15 of its own, which is guided by the guide rolls 18.
  • the drying wires 15 press the web W to be dried on the drying cylinders 10 against the smooth heated faces of the cylinders, and on the reversing cylinders 11 the web W remains at the side of the outside curve on the outside face of the wire 15.
  • the web W is kept reliably on the support of the wire 15 against the effect of centrifugal forces by the effect of the vacuum present on the grooved faces 12 of the reversing cylinders 11 or on the perforated mantle of an equivalent suction roll, whereby cross-direction shrinkage of the web W is also counteracted.
  • suction cylinders 11 particularly favourably are used the suction cylinders which are marketed by the applicant with the trade mark "VAC-ROLL”TM and which have no inside suction boxes, and with respect to the details of the constructions of said suction cylinders reference is made to the applicant's FI Patent No. 83,680 (equivalent to US Pats. Nos. 5,022,163 and 5,172,491 ).
  • the support contact between the web W and the drying wire 15 is kept adequate also on the straight draws between the drying cylinders 10 and the reversing cylinders 11 by, at least on the runs from the drying cylinders 10 to the reversing cylinders 11, making use of blow-suction boxes 17, by means of which boxes formation of pressures induced by the wire 15 is also prevented in the closing wedge-shaped nip spaces between the wire 15 and the cylinder 11 mantles.
  • Blow-suction boxes 17 are understood as blow boxes whose air blowing produces a vacuum, and said boxes 17 do not communicate with sources of vacuum.
  • blow-suction boxes 17 which are marketed by the applicant with the trade mark "UNO RUN BLOW BOX”TM
  • Blow-box solutions of other types, in themselves known, are also included in the scope of the overall concept of the present invention.
  • blow boxes 16 are also employed in the gaps between the reversing cylinders 11, by means of which boxes 16 said gap spaces are air-conditioned and evaporation from the web W is promoted.
  • the faces of the drying cylinders 10 are kept clean by doctors 14.
  • suction zone should preferably be extended over an area wider than the turning sector of the drying wire 15 and the web, so that the suction effect and the free flow of air can be extended into said wedge spaces, for the purposes mentioned above.
  • the dry end of a paper machine in accordance with the invention includes a finishing unit D2 placed after the forward dryer D1, which finishing unit includes a machine reel-up 50, for example a Pope-type reel-up.
  • a machine reel that is being produced on-line by means of the reel-up 50 is denoted with the reference MR 0
  • one complete machine reel is denoted with the reference MR.
  • the web W is brought to the machine reel-up 50 through the calender 40 from an after-dryer 30, which is placed after the coating device 20 in the finishing section D 2 .
  • the paper web W which has been dried to a dry solids content of k 2 ⁇ 96...99 %, is passed over paper guide rolls 25 and over a measurement beam 26, which is placed between said guide rolls 25 and which measures the property profiles of the paper, into a coating device 20, which is, for example, a coating device marketed by the applicant with the name Sym-SizerTM.
  • the coating device 20 includes two coating rolls 21 and 22 placed one opposite to the other, and size feed devices 23 and 24 are placed in connection with both of said rolls so that the paper web W is coated from both sides in the coating nip NS between the rolls 21 and 22.
  • the web W is partly moistened in the coating nip NS from both sides. Then, the web W, which was dried in the forward dryer D1 asymmetrically from the side of its bottom face W and which has a tendency of curling, is treated into such a state that its internal strains are partly relaxed or at least substantially reduced.
  • the forward dryer section D 1 is exclusively composed of dryer groups R 0 ...R 6 with single-wire draw; in which the paper web W runs meandering from a drying cylinder 10 onto a reversing roll 11 and onto a drying cylinder 10 and so on.
  • the dryer groups R 0 ...R 6 in connection with some of the drying cylinders 10 in the groups, upper impingement blow equipments 19 have been fitted in order to regulate the curling, by means of which impingement blow equipments 19 hot air is blown towards the web W, and evaporation takes place through the wire 15 thus regulating the curling.
  • the after-dryer 30 in the finishing section D 2 is also exclusively composed of dryer groups R 21 ,R 22 ,R 23 with single-wire draw, in connection with which groups an option has been arranged for an impingement blow equipment 19A for possible requirement of additional regulation of curling.
  • the curling is controlled by means of steam boxes 31.
  • an infra dryer 32 has been fitted.
  • one steam box 31 has been fitted before the web W is passed to the calender 40.
  • Impingement drying can be used in the forward dryer section D 1 also for requirements of additional capacity, for example for increased running speed and for two-sided drying.
  • the blowings from the impingement blow devices 19 also affect the regulation of curling so that ventilation is provided in the web area, in which case the evaporation is less one-sided.
  • the wire 15 must be as open as possible, and when the web runs, for example, at a speed of 25 metres per second, the blow velocity of the blow air must be 25 to 150 metres per second, optimally about 100 metres per second.
  • the blow angle of the nozzles of the impingement blow devices 19 is chosen optimally based on the wire properties that are used, on the running speed of the machine, and on other parameters.
  • the blow air can be outdoor air or heated air, up to 400 °C, preferably of a temperature of 70...200 °C.
  • the forward dryer section D 1 is similar to that shown in Fig. 1, but here the after-dryer 30 is also provided with impingement blow devices 19.
  • the last dryer group R 23 in the after-dryer 30 a lower support belt 33 has been arranged, by means of which belt evaporation of water out of the bottom face of the web W is prevented, whereby the curling is regulated.
  • the lower support belt 33 is a tight belt, which prevents removal of moisture through the bottom face, in which case the moisture is removed from the opposite side of the web W; thus, since the belt 33 prevents evaporation from the bottom face, the web W is curled towards the bottom face. It is a further advantage of the support belt 33 that here the web runs between two belts 33,15, in which case the web W is supported particularly well.
  • a support belt 33 When a support belt 33 is used, its guide rolls 33A are placed at a lower level, approximately at the same level as the bottom edges of the reversing cylinders, in which case the removal of broke is easy as the belt 33 operates as a broke conveyor at the same time.
  • the support belt 33 is preferably provided with a drive of its own, in which case its tension can be regulated as required.
  • the support belt 33 is preferably a dense wire, whose permeability is low, or a smooth-faced belt.
  • the temperature of the belt 33 can be adjusted, it can be cooled and/or heated as required when the curling is controlled. In this connection it is also favourably possible to introduce moist air into the area between the belt 33 and the reversing cylinders 11, whereby the process can be made more efficient.
  • the forward dryer section D 1 in the exemplifying embodiment shown in Fig. 3 is similar to those shown in Figs. 1 and 2, but in this exemplifying embodiment the last two dryer groups R 32 ,R 33 in the after-dryer 30 have been formed as dryer groups with twin-wire draw, by means of which groups, thus, the curling is regulated.
  • the dryer cylinders 10A, 10B are fitted in two rows, and the cylinders in each row have a wire circulation 15A, 15B of their own guided by the guide rolls 18A,18B, and between the rows the web W has free unsupported draws.
  • impingement blow devices 19 have been fitted in the forward dryer section in connection with the drying cylinders 10 in the upper row in view of regulating the curling, increasing the capacity, and providing two-sided drying.
  • the exemplifying embodiment shown in Fig. 4 is similar to that shown in Fig. 3, but in this embodiment, in view of controlling the curling, impingement blow equipments 19 have been provided additionally in connection with the first dryer group R 21 in the after-dryer.
  • the steam temperature in the cylinders 10 is rather low, in which case the impingement blow devices 19 also provide additional capacity for heating the web W.
  • the impingement blow devices 19 of course in connection with all the embodiments described here, that their temperatures can be regulated quickly, in which case, for example, change of the machine from one paper grade to another is quicker, whereby additional production is achieved.
  • a larger ratio of diameter of drying cylinder to diameter of reversing roll (D syl /D tela in Fig. 5) is employed, compared with the forward dryer section D 1 , in which case a more uniform evaporation is provided at the top/bottom side, and thereby the curling can be controlled.
  • the after-dryer 30 in the finishing section D 2 is composed of two dryer groups R 21 ,R 22 with single-wire draw.
  • steam boxes 31 have also been arranged in order to control the curling.
  • the exemplifying embodiment as shown in Fig. 5 can be fitted as an after-dryer 30 in connection with the forward dryers D 1 illustrated in the figures described above.
  • the drying cylinders 10 have preferably adjustable steam pressures, and, if necessary, it is possible to use impingement blow devices 19 also in connection with these drying cylinders 10 in order to increase the capacity.
  • impingement blow devices 19 At the side of the reversing cylinders 11, if necessary, it is possible to provide additional moisture, for example, by bringing moist air from the forward dryer section D 1 , by using a water atomizing equipment, support belts, or equivalent arrangements that have been described above and will be described later.
  • an infra dryer 32 is fitted, by whose means the web W is dried intensively from the top side.
  • a what is called spreader bar 34 has been fitted also in connection with the web, by means of which bar 34 the longitudinal curling of the web W is worked mechanically.
  • the spreader bar 34 is a profiling roll, for example of the spreader roll type, in which case, in order to work the longitudinal curling, by its means it is also easy to act upon the cross-direction curling by means of mechanical working.
  • a spreader bar 34 can be fitted at either side of the web or at both sides.
  • the exemplifying embodiment shown in Fig. 6D comprises a forward dryer section D 1 with single-wire draw, in which options have been arranged for possible impingement blow devices 19A.
  • the regulation of curling has been arranged by means of steam boxes 31 and a water spray device 35 fitted in connection with the last dryer group R 23 in the after-dryer 30.
  • the after-dryer there are optional provisions for impingement blow equipments 19A.
  • the last two groups R 22 ,R 23 in the after-dryer 30 are provided with lower support belts 33, which prevent evaporation of water, and, moreover, in connection with the last dryer group, steam boxes 31 and a water spray device 35 have been fitted.
  • the emphasis is in particular on the control of curling before the calender 40 while the web W is cool.
  • a particularly efficient combination is achieved, because, the hotter the web W is, the less readily is the steam condensed, in which connection, when cooling cylinders are used, efficient condensation of the steam is obtained.
  • the web W tends to be curled towards the side at which drying takes place last.
  • the curling can be affected at different stages in different ways so as to obtain an optimal application.
  • the web W can be moistened so that, in the final end of the dryer section, the face(s) of one or several drying cylinders is/are moistened, for example, by means of a water atomizing device fitted preferably in connection with a doctor 14, and the water fed out of said atomizer is vaporized and enters efficiently into contact with the web by the effect of the pressure caused by the wire.
  • a water atomizing device fitted preferably in connection with a doctor 14
  • the water fed out of said atomizer is vaporized and enters efficiently into contact with the web by the effect of the pressure caused by the wire.
  • the patent FI 70,275 related to the present invention instructs to control the temperature of the drying wire so that the drying efficiency can be affected. Similarly, by means of the temperature of the drying wire it is possible to control the unequalsidedness of drying. According to the present invention, in the after-dryer there are devices by whose means the temperature of the drying wire or wires and, thereby, the curling are affected.
  • the wire can be heated, for example, by means of a steam box. For cooling, it is possible to use, for example, the methods and devices known from said FI Patent 70,275 .
  • the curling can also be controlled by adjusting the humidity and temperature of the air blown through UNORUNTM blow boxes.
  • unequalsided evaporation and curling of the web can be affected by means of the humidity of the air in the hood surrounding the web from different sides.

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  • Drying Of Solid Materials (AREA)

Claims (28)

  1. Procédé pour le séchage du papier, lequel procédé comprend les étapes suivantes :
    a) la bande de papier (W) à sécher est amenée depuis la section de presse dans une section de sécheurs avant (D1), dans laquelle la bande de papier (W) est séchée à partir du côté de sa face arrière dans des groupes de sécheurs (R1.....RN) qui appliquent une circulation monotoile normale, ladite section de sécheurs avant (D1) comprenant exclusivement des groupes monotoiles (R1... . RN) à circulation monotoile normale,
    b) à partir de la section de sécheurs avant (D1), la bande de papier (W) est amenée dans une section de finition (D2), dans laquelle la bande de papier (W) subit un couchage/surfaçage au moyen d'une installation de couchage/surfaçage (20), est séchée dans une section de post-sécheurs (30), dans laquelle la bande de papier (W) est séchée dans au moins un groupe de sécheurs (R21) qui applique une circulation monotoile normale, après quoi la bande de papier (W) est calandrée dans une calandre (40) et amenée dans une station de bobinage (50), dans laquelle la bande de papier (W) est enroulée dans une machine à rouleaux (MR), et
    c) le bouclage de la bande de papier est commandé au moyen d'éléments (19;32;33;34;35;36 ; Dsyl,Dtela) et/ou au moyen d'ensembles et de combinaisons formés à partir desdits éléments et au moyen d'au moins une boíte à vapeur (31) au moins dans la zone de la section de finition (D2),
    CARACTERISE en ce que, dans le procédé, l'effet de ladite boíte à vapeur est intensifié en refroidissant la bande de papier avant ladite boíte à vapeur.
  2. Procédé selon la revendication 1, CARACTERISE en ce que, en liaison avec l'alimentation de ladite vapeur, pour intensifier la condensation, on utilise un cylindre de refroidissement à température réglable.
  3. Procédé selon la revendication 1 ou 2, CARACTERISE en ce que la température de la bande de papier (W) est abaissée au moyen d'une humidification.
  4. Procédé selon l'une quelconque des revendications 1 à 3, CARACTERISE en ce que, dans le procédé, le bouclage de la bande de papier (W) s'effectue au moyen de dispositifs de soufflage incident (19) placés dans la section des sécheurs avant (D1) au-dessus d'un cylindre de séchage (10)/cylindres, au moyen desquels dispositifs (19) de l'air, de préférence chaud, humide est soufflé sur la bande de papier (W).
  5. Procédé selon l'une quelconque des revendications 1 à 4, CARACTERISE en ce que dans le post-sécheur (30) le bouclage de la bande de papier (W) est commandé au moyen de boítes de vapeur (31), avec lesquelles de la vapeur ayant une teneur énergétique est soufflée sur la bande de papier (W) qui défile en liaison avec les cylindres d'inversion (11) dans au moins un groupe de sécheurs (R21,R23) à circulation monotoile dans le post-sécheur (30).
  6. Procédé selon l'une quelconque des revendications 1 à 5, CARACTERISE en ce que, dans le procédé, le bouclage de la bande de papier est commandé au moyen d'une ceinture ou toile de support inférieure (33) fixée dans au moins un groupe de sécheurs (R21,R22,R23) dans le post-sécheur (30), au moyen de laquelle ceinture/toile de support l'évaporation de l'humidité vers le bas de la bande de papier (W) est empêchée.
  7. Procédé selon la revendication 1, CARACTERISE en ce que, dans le procédé, dans un post-sécheur (30) avec au moins trois groupes de sécheurs, le bouclage de la bande de papier (W) est commandé dans les deux derniers groupes de sécheurs dans le post-sécheur (30), lesquels groupes ont été agencés en tant que groupes de sécheurs (R23,R33) qui appliquent une circulation double toile, la bande de papier (W) étant séchée à partir du côté de sa face supérieure et à partir du côté de sa face inférieure.
  8. Procédé selon l'une quelconque des revendications 1 à 7, CARACTERISE en ce que dans le post-sécheur (30) le bouclage de la bande de papier (W) est commandé au moyen d'une installation de soufflage incident (19) placée au-dessus d'un cylindre de séchage (10)/cylindres (10) dans au moins un groupe de sécheurs (R21,R22,R23) à circulation monotoile normale dans le post-sécheur (30).
  9. Procédé selon l'une quelconque des revendications 1 à 8, CARACTERISE en ce que, dans le procédé, le bouclage de la bande de papier (W) est commandé dans les groupes de sécheurs dans le post-sécheur (30) de sorte que la bande de papier (W) est guidée sur les cylindres de séchage (10) et rouleaux inverseurs (11) dont le rapport de diamètre (Dsyl;Dtela) a été agrandi par rapport à la section de sécheurs avant (D1) afin d'obtenir un séchage plus uniforme.
  10. Procédé selon l'une quelconque des revendications précédentes, CARACTERISE en ce que, dans le procédé, le bouclage de la bande de papier (W) s'effectue en pulvérisant un brouillard d'eau en contact avec la bande de papier (W) au moyen d'un ou de dispositif(s) d'atomisation d'eau (35) dans le post-sécheur (30).
  11. Procédé selon l'une quelconque des revendications précédentes, CARACTERISE en ce que, dans le procédé, le bouclage de la bande de papier (W) s'effectue au moyen d'un séchage complet de la bande de papier (W) au moyen d'un sécheur infrarouge (32) avant que la bande de papier (W) ne passe dans la calandre (40).
  12. Procédé selon l'une quelconque des revendications précédentes, CARACTERISE en ce que, dans le procédé, le bouclage de la bande de papier (W) est commandé en soufflant de l'air humide vers la bande de papier (W), lequel air a de préférence été apporté depuis la section de sécheurs avant (D1) par l'intermédiaire de calottes (36) placées en liaison avec au moins un groupe de sécheurs (R21,R22,R23) dans le post-sécheur.
  13. Procédé selon l'une quelconque des revendications précédentes, CARACTERISE en ce que, dans le procédé, le bouclage de la bande de papier (W) est commandé au moyen d'une barre d'entretoise (34), au moyen de laquelle la bande de papier (W) est travaillée mécaniquement.
  14. Procédé selon l'une quelconque des revendications 1 à 5 ou 7 à 13, CARACTERISE en ce que la section de sécheurs avant est exclusivement composée de groupes normaux à circulation monotoile qui sont ouverts vers le bas, et/ou, dans le procédé, dans le post-sécheur (30), la bande de papier (W) est séchée sensiblement exclusivement au moyen de groupes de sécheurs (R21,R22,R23) à circulation monotoile normale.
  15. Section sèche d'une machine à papier qui comprend une section de sécheurs avant (D1) et une section de finition (D2), laquelle section de finition (D2) comprend une installation de couchage/surfaçage (20), un post-sécheur (30), une calandre (40), et une station de bobinage (50), et la section sèche d'une machine à papier comprend de plus des éléments (19;32;33;34;35;36;Dsyl,Dtela) et/ou des ensembles ou combinaisons formés à partir desdits éléments et au moins une boíte à vapeur (31) afin de commander le bouclage de la bande de papier (W) au moins dans la zone de la section de finition (D2), CARACTERISEE en ce que ladite section sèche d'une machine à papier comprend des éléments pour abaisser la température de la bande de papier (W) en amont de ladite boíte à vapeur pour intensifier l'effet de ladite boíte de vapeur.
  16. Section sèche d'une machine à papier selon la revendication 15, CARACTERISEE en ce que, en liaison avec ladite alimentation en vapeur, pour intensifier la condensation, on utilise un cylindre de refroidissement de température réglable.
  17. Section sèche d'une machine à papier selon la revendication 15 ou 16, CARACTERISEE en ce que la section sèche comprend des éléments pour abaisser la température de la bande de papier (W) au moyen de l'humidification.
  18. Section sèche d'une machine à papier selon l'une quelconque des revendications 15 à 17, CARACTERISEE en ce que la section sèche comprend une installation de soufflage incident (19) montée en liaison avec au moins un groupe de sécheurs au-dessus d'un ou de cylindres de séchage (10) dans la section de sécheurs avant (D1) et/ou dans le post-sécheur (30).
  19. Section sèche d'une machine à papier selon l'une quelconque des revendications 15 ou 18, CARACTERISEE en ce que la section sèche comprend au moins une boíte de vapeur (31) montée dans le post-sécheur (30) pour souffler la vapeur en direction de la bande de papier (W) en liaison avec les groupes (R21,R22,R23) à circulation monotoile dans le post-sécheur (30).
  20. Section sèche d'une machine à papier selon l'une quelconque des revendications 15 à 19, CARACTERISEE en ce que la section sèche comprend au moins une ceinture ou toile de support (33) montée dans un groupe de sécheurs (R21,R22,R23) dans le post-sécheur (30) pour empêcher l'évaporation de l'humidité vers le bas à partir de la bande de papier (W).
  21. Section sèche d'une machine à papier selon l'une quelconque des revendications 15 à 20, CARACTERISEE en ce que dans les deux derniers de sécheurs dans le post-sécheur (30) sont des groupes de sécheurs (R32,R33) à circulation double-toile.
  22. Section sèche d'une machine à papier selon l'une quelconque des revendications 15 à 20, CARACTERISEE en ce que dans le post-sécheur le rapport (Dsyl;Dtela) du diamètre des cylindres de séchage est supérieur audit rapport dans la section des sécheurs avant.
  23. Section sèche d'une machine à papier selon l'une quelconque des revendications 15 à 22, CARACTERISEE en ce que la section sèche comprend un/des dispositif(s) d'atomisation d'eau (35) pour pulvériser un brouillard d'eau au niveau de la bande de papier (W) pour commander le bouclage.
  24. Section sèche d'une machine à papier selon l'une quelconque des revendications 15 à 23, CARACTERISEE en ce que le post-sécheur comprend un sécheur infrarouge (32) qui est placé avant que la bande de papier ne passe dans la calandre (40).
  25. Section sèche d'une machine à papier selon l'une quelconque des revendications 15 à 23, CARACTERISEE en ce que la section sèche comprend des calottes (36) montées en liaison avec au moins un groupe de sécheurs dans le post-sécheur (30) pour souffler l'air humide apporté depuis la section de sécheurs avant (D1) en direction de la bande de papier.
  26. Section sèche d'une machine à papier selon l'une quelconque des revendications 15 à 25, CARACTERISEE en ce qu'une barre entretoise (34) est montée dans le post-sécheur pour travailler la bande de papier mécaniquement et pour commander le bouclage de la bande de papier.
  27. Section sèche d'une machine à papier selon l'une quelconque des revendications 15 à 20 ou 22 à 26, CARACTERISEE en ce que le post-sécheur (30) comprend exclusivement des groupes de sécheurs (R21,R22,R23) à circulation monotoile normale.
  28. Procédé selon l'une quelconque des revendications 1 à 14 ou section sèche d'une machine à papier selon l'une quelconque des revendications 15 à 27, CARACTERISE en ce que ladite section de sécheurs et des dispositifs auxiliaires sont commandés en fonction ou de mesures en ligne ou hors ligne de bouclage et de qualité dans le but de parvenir à une qualité globale finale optimum.
EP97946772A 1996-12-03 1997-12-02 Procede de sechage du papier section seche d'une machine a papier Expired - Lifetime EP0943034B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI964830 1996-12-03
FI964830A FI105935B (fi) 1996-12-03 1996-12-03 Menetelmä paperin kuivaamiseksi sekä paperikoneen kuivapää
PCT/FI1997/000745 WO1998027273A1 (fr) 1996-12-03 1997-12-02 Procede de sechage et du papier et section seche d'une machine a papier

Publications (3)

Publication Number Publication Date
EP0943034A1 EP0943034A1 (fr) 1999-09-22
EP0943034B1 true EP0943034B1 (fr) 2002-10-23
EP0943034B2 EP0943034B2 (fr) 2008-12-03

Family

ID=8547198

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Application Number Title Priority Date Filing Date
EP97946772A Expired - Lifetime EP0943034B2 (fr) 1996-12-03 1997-12-02 Procede de sechage du papier section seche d'une machine a papier

Country Status (11)

Country Link
EP (1) EP0943034B2 (fr)
JP (1) JP3650131B2 (fr)
KR (1) KR100391045B1 (fr)
CN (1) CN1096529C (fr)
AT (1) ATE226660T1 (fr)
AU (1) AU5189798A (fr)
BR (1) BR9713820A (fr)
CA (1) CA2274228C (fr)
DE (1) DE69716634T3 (fr)
FI (1) FI105935B (fr)
WO (1) WO1998027273A1 (fr)

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US6038789A (en) * 1997-05-15 2000-03-21 Valmet Corporation Method for controlling the curl of paper and a paper or board machine line that applies the method
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CA2339281A1 (fr) * 1998-08-04 2000-02-17 Valmet Corporation Procede et dispositif de traitement de bandes de papier ou de carton
FI106269B (fi) * 1999-05-10 2000-12-29 Valmet Corp Päällepuhallussovitelma ja -menetelmä käsiteltävän paperi- tai kartonkirainan käyristymistaipumuksen kompensoimiseksi sekä paperi- tai kartonkikone
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FI121674B (fi) * 2003-01-09 2011-02-28 Metso Paper Inc Menetelmä ja sovitelma liikkuvan paperi- tai kartonkirainan kostuttamiseksi
DE10325572A1 (de) * 2003-06-05 2004-12-23 Voith Paper Patent Gmbh Vorrichtung und Verfahren zur Herstellung und/oder Behandlung einer Faserstoffbahn
DE10347953A1 (de) * 2003-10-15 2005-05-19 Voith Paper Patent Gmbh Bahnbefeuchtung
DE102004017807A1 (de) * 2004-04-13 2005-10-27 Voith Paper Patent Gmbh Trockenanordnung
JP4651314B2 (ja) * 2004-06-15 2011-03-16 レンゴー株式会社 紙・板紙の表面平滑処理装置
DE102006049025A1 (de) * 2006-10-13 2008-04-17 Voith Patent Gmbh Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn
DE102006049078A1 (de) * 2006-10-13 2008-04-17 Voith Patent Gmbh Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn
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DE102008000133A1 (de) * 2008-01-23 2009-07-30 Voith Patent Gmbh Trockenpartie
DE202008005359U1 (de) * 2008-04-17 2008-07-10 Metso Paper, Inc. Anordnung zur Einstellung der Krümmung der Papier-/Kartonbahn für ein wärmeempflindliches Produkt
KR101016727B1 (ko) * 2008-07-30 2011-02-25 솔거특수지(주) 전자소재 제조공정용 캐리어 용지의 제조방법 및 이를 위한장치와 그에 따라 제조된 캐리어 용지
FI125147B (fi) * 2011-08-31 2015-06-15 Valmet Technologies Inc Järjestelmä ja menetelmä paperin tai kartongin valmistamiseksi
CN102888777A (zh) * 2012-10-23 2013-01-23 河南江河纸业股份有限公司 高速纸机干燥部
EP2765237B1 (fr) 2013-02-06 2016-11-23 Valmet Technologies, Inc. Procédé de production d'une bande de fibres et ligne de fabrication d'une bande de fibres
FR3022564B1 (fr) * 2014-06-18 2017-06-30 Allimand Procede de sechage d'une bande de papier a cigarettes et papier a cigarettes ainsi obtenu
EP3601666B1 (fr) * 2017-03-21 2024-01-17 Voith Patent GmbH Traitement de bande
DE102018119383A1 (de) * 2018-08-09 2020-02-13 Voith Patent Gmbh Maschine und Verfahren zur Herstellung einer Wellpappenrohpapierbahn
CN112127200A (zh) * 2020-09-30 2020-12-25 湖北中烟工业有限责任公司 一种饱和蒸汽加湿内衬纸的加湿系统
CN114622434A (zh) * 2022-04-18 2022-06-14 广东理文造纸有限公司 一种热缸控温涂布装置及其控温方法

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Also Published As

Publication number Publication date
CN1096529C (zh) 2002-12-18
CN1239527A (zh) 1999-12-22
DE69716634D1 (de) 2002-11-28
BR9713820A (pt) 2000-03-14
CA2274228A1 (fr) 1998-06-25
FI964830A0 (fi) 1996-12-03
EP0943034A1 (fr) 1999-09-22
FI105935B (fi) 2000-10-31
DE69716634T3 (de) 2009-07-16
CA2274228C (fr) 2007-03-27
AU5189798A (en) 1998-07-15
ATE226660T1 (de) 2002-11-15
DE69716634T2 (de) 2003-06-26
KR100391045B1 (ko) 2003-07-12
KR20000053015A (ko) 2000-08-25
JP3650131B2 (ja) 2005-05-18
FI964830A (fi) 1998-06-04
WO1998027273A1 (fr) 1998-06-25
EP0943034B2 (fr) 2008-12-03
JP2001505630A (ja) 2001-04-24

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