EP1911876B1 - Procédé et dispositif destinés à la fabrication d'une bande fibreuse - Google Patents

Procédé et dispositif destinés à la fabrication d'une bande fibreuse Download PDF

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Publication number
EP1911876B1
EP1911876B1 EP07113086A EP07113086A EP1911876B1 EP 1911876 B1 EP1911876 B1 EP 1911876B1 EP 07113086 A EP07113086 A EP 07113086A EP 07113086 A EP07113086 A EP 07113086A EP 1911876 B1 EP1911876 B1 EP 1911876B1
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EP
European Patent Office
Prior art keywords
fibrous web
flowbox
layer
layer orientation
former
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.)
Not-in-force
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EP07113086A
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German (de)
English (en)
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EP1911876A1 (fr
Inventor
Wolfgang Ruf
Hans Loser
Volker Schmidt-Rohr
Torben Schlieckau
Axel Von Noorden
Karl Bunz
Ole Hansen
Konstantin Fenkl
Markus Häußler
Klaus Lehleiter
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Voith Patent GmbH
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Voith Patent GmbH
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Priority to PL07113086T priority Critical patent/PL1911876T3/pl
Publication of EP1911876A1 publication Critical patent/EP1911876A1/fr
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Publication of EP1911876B1 publication Critical patent/EP1911876B1/fr
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    • 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/028—Details of the nozzle section
    • 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
    • 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
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • the present invention relates to a device for producing a fibrous web, in particular paper web, with a headbox and other components, such as former, press section, dryer section, coater and / or calender, wherein the configuration and / or the operation of the headbox alone or in combination with the configuration of at least one further component is selected so that there is a desired profile of the layer orientation in the z-direction with respect to a curl influencing the fibrous web.
  • a headbox and other components such as former, press section, dryer section, coater and / or calender
  • the present invention relates to a method for producing a fibrous web, in particular paper web, in which a pulp suspension is introduced by means of a headbox in a former and then further treated by means of other components such as press section, dryer section, coater and / or calender, wherein the design and / or the operation of the headbox alone or in combination with the design and / or operation of at least one further component is selected so that there is a desired profile of the layer orientation in the z-direction with respect to a curl influencing the fibrous web.
  • Such a device and such a method are for example from the publications WO 97/47803 A1 and US 2005/0144802 A1 known.
  • the finished fibrous web has little or no tendency to curl, curl, curl and the like in terms of performance in the subsequent copying process.
  • the curl is caused, for example by a Umrytmaschine the fibrous web.
  • the moisture content of the fibrous web and thus also of the fibers is reduced.
  • the fibers shrink and create stresses in the fibrous web which cause curling when the fibrous web is asymmetrically heated. So far, it has been attempted to compensate for this tendency to curl in the production process of the fibrous web by an asymmetric heating course in the production machine by means of two-row drying groups. But this was only insufficient.
  • each layer has a more or less pronounced anisotropy with respect to the fiber orientation in the plane.
  • the layers may each have main layers of fiber layers, which are characterized in that a certain number of fibers are aligned in the same direction. Fibrous main directions may point exactly in the machine main direction or across it or in directions therebetween. How many fibers point in a common direction is expressed in the degree of anisotropy. High anisotropy means that many fibers are oriented in one direction and vice versa.
  • the anisotropy of the fiber layers also significantly determines the anisotropy of the mechanical properties, e.g. the in-plane strength anisotropy.
  • the anisotropy or the degree of anisotropy may be different in the layers. Then one speaks of a non-constant profile of the layer orientation measured over the sheet thickness, ie in the z-direction.
  • a measure of the different layer orientation in the z-direction can be, for example, the ratio of the tenacial length ratios of the upper half of the sheet to the lower half of the sheet. This measure should be at the end of the paper machine in the range of 0.7 to 1.3, preferably from 0.8 to 1.2, lie.
  • the tenacity ratio is the ratio of the tear length in the machine direction (MD direction) and the tear length in the cross machine direction (CD direction). This can be determined for the entire fibrous web or, after splitting the fibrous web in layers, also for each layer.
  • a profile of the layer orientation manifests itself in particular in a two-sidedness, that is to say a different layer orientation on the upper side of the sheet and on the lower side of the sheet.
  • a two-sidedness can arise due to the asymmetrical structure of the headbox nozzles.
  • the fibers are increasingly aligned in the machine direction.
  • On the opposite lower lip side finds an alignment in Machine direction due to the increased microturbulence only limited.
  • the press section and the dryer section in a paper machine a two-sidedness of the layer orientation between the upper side of the sheet and the lower side of the sheet can be generated.
  • the invention has the object to improve a device and a method of the type mentioned.
  • the properties of the fibrous web, in particular the curl of the fibrous web, should be improved.
  • a device of the type mentioned characterized in that a former having a forming roller arranged on the upper side of the fibrous web is combined with a headbox which causes a correspondingly asymmetrical layer orientation, and in that the headbox for effecting the asymmetrical layer orientation comprises an asymmetrical nozzle and / or an asymmetrical disk arrangement and / or a two-or has multilayer structure with different film speeds.
  • the object is achieved by in that a former is combined with a forming roll arranged on the upper side of the fibrous web, with a headbox causing a correspondingly asymmetric layer orientation, and that the headbox is provided with an asymmetrical nozzle and / or asymmetrical lamellae for effecting the asymmetrical layer orientation and / or two or is formed multi-layered, wherein the layer velocities of the pulp suspension are chosen according to different.
  • the inventors have recognized that the headbox, the former, the press section, the dryer section and other components of the production machine have different effects on the structure of the fibrous web with regard to curl tendency. While the headbox and the former can mainly negatively affect the fiber layer of the fibrous web, the press section, for example, has an effect on the composition of the fibrous web in the z-direction. For example, a different ratio between fibers and fillers on the top and the bottom of the As a result of these structural differences, fibrous webs have a negative effect on curl tendency.
  • the headbox offers the possibility of correcting the layer orientation by shaping its flow space a correction, so that in later use of the fibrous web minimal or no curl occurs more.
  • a symmetrical to the median plane of the fibrous web layer orientation is desired or in certain cases an asymmetric layer orientation.
  • an asymmetric layer orientation may be preferred or chosen for certain types of paper to compensate for an influence of another component of the paper machine on the profile of the layer orientation.
  • the selection is preferably made such that a desired, preferably no curl tendency in the fibrous web results before the coater and / or that a desired, preferably no curl tendency results in the finished fibrous web.
  • the headbox on the one hand and / or the former, on the other hand, or only the headbox, depending on the machine configuration are configured and combined with one another in the manner described above.
  • the solution can be used particularly advantageously in the production of copy paper, in particular of wood-free pulp fibers.
  • the former types of formers described so far are from the group of twin-wire formers, and more particularly from the sub-group of roll-blade formers in which the first dewatering element is a rotating dewatering element, such as a forming roll, ie an open roll.
  • This drainage element can be operated with or without a vacuum.
  • the invention also relates to formers in which the forming roll is formed by a stationary dewatering element, such as, for example, an evacuated or non-evacuated and preferably curved shoe.
  • a stationary dewatering element such as, for example, an evacuated or non-evacuated and preferably curved shoe.
  • at least one evacuated forming roll can follow this type of former.
  • the invention can also find application in a so-called hybrid former.
  • This type of shaper is characterized in that the twin-wire zone follows only after a Einsiebzone. In this, absorbent elements are used for drainage. An asymmetric layer orientation is the result. In the twin-wire area, in turn, at least one forming roll or suction roll and stationary dewatering elements can follow.
  • the invention is applicable to four-wire former which exclusively dewater to one side and thus - depending on the choice of the drainage course - produce a more or less asymmetric layer orientation applicable.
  • the in Fig. 1a Former shown is part of a paper machine with a headbox 1, said former 2, a subsequent press section 3, of which only the beginning is shown, and other components such as dryer section, optionally coater and calender.
  • the former 2 comprises a forming roller 5 arranged in a bottom wire loop 4 and a forming suction device 6 arranged in a top wire loop 6.
  • the bottom wire loop 4 and top wire loop 6 are each guided via deflection rollers 8.
  • a suction device 9 and a suction sieve roller 10 are arranged.
  • a pickup roller 11 which already belongs to the press section 3, the fibrous web is removed from the lower wire 4 of the former and fed to the press section 3.
  • the forming roller 5 is thus arranged on the underside of the fibrous web.
  • Fig. 1b is shown that such a Shaper design results in a symmetric layer orientation.
  • the jet velocity is greater than the sieve speed.
  • the forming roller 5 is arranged in the upper wire loop 6.
  • the lower wire loop 4 has the forming suction 7.
  • Both sieve loops 4 and 6 are again guided in each case over deflection rollers 8, and here too a suction device 9 and a sieve suction roller 10 are provided, the suction device 9 being located in the upper sieve loop 6 and the sieve suction roller 10 again in the lower sieve loop 4.
  • the web removal to the press section is also carried out here by a pickup roller 11 which is arranged in a felt loop 12.
  • the forming roller 5 is on the upper side of the fibrous web.
  • Fig. 2b results from such a former design an asymmetric layer orientation.
  • the jet velocity is greater than the sieve speed.
  • Fig. 3a Also in the variant of Fig. 3a is the forming roller 5 on the top of the fibrous web.
  • the difference to the variant of Fig. 2 consists merely in that the Formiersauger 7 is on the top of the fibrous web, so in the upper wire loop 6, while the suction device 9 is arranged in the lower wire loop 4.
  • this variant agrees with the variant of Fig. 2 match.
  • Fig. 3b results from such a former design an asymmetric layer orientation.
  • the jet velocity is greater than the sieve speed.
  • a stationary dewatering element such as an evacuated or not vacuumed and preferably curved shoe
  • a headbox 1 has an asymmetrical nozzle 13 with a diaphragm 14 on the top and a protruding bottom lip 15 on the bottom.
  • the headbox of this first variant has symmetrically arranged lamellae 16.
  • the diaphragm 14 has a main surface which is in contact with the inner surface of the upper nozzle wall or the lower nozzle wall and which is in contact with at least one pulp suspension guided through the asymmetrical nozzle 13.
  • a "parallel-aperture" is in the German patent application DE 10 2004 047 879 A1 disclosed; Their disclosure content is hereby made the subject of the present description.
  • the lower lip board ULV of the lower lip 15 may in this embodiment have a value in the range of 0.1 to 1.0 mm, preferably from 0.2 to 0.5 mm.
  • Fig. 4b results from such a design of the headbox asymmetric layer orientation, namely a high anisotropy in the upper half 17 and a lower anisotropy in the lower half 18 of the fibrous web. That is, the fibers in the upper half 17 have a fiber layer main direction, while in the lower half, no such direction is preferred.
  • the diaphragm 14 in this second variant of the headbox 1, it is also possible for the diaphragm 14 to have a main surface which is in contact with the inner surface of the upper nozzle wall or the lower nozzle wall and touched by the at least one fibrous suspension guided through the asymmetrical nozzle 13.
  • a "parallel-aperture" is in the German patent application DE 10 2004 047 879 A1 disclosed; Their disclosure content is hereby made the subject of the present description.
  • the lower lip board ULV of the lower lip 15 may in this embodiment have a value in the range of 0.1 to 1.0 mm, preferably from 0.2 to 0.5 mm.
  • Fig. 5b represented by the combination of an asymmetrical nozzle 13 with reversed asymmetric blades 16 results in a symmetrical layer orientation.
  • both the nozzles 13 and the lamellae are symmetrical. Accordingly, as shown in the Fig. 6b and 7b shown, a symmetric layer orientation.
  • Fig. 8a again shows the symmetric layer orientation.
  • Fig. 9a has a flexible separating element 19.
  • the nozzle design here is asymmetrical, so that as in Fig. 9b shown, gives an asymmetric layer orientation.
  • Fig. 10a Another variant is shown, depending on the variant Fig. 9a only differs in that here the lamellae are reversely arranged asymmetrically. As a result, the asymmetrical nozzle design is compensated, so that according to Fig. 10b gives a symmetric layer orientation.
  • the subsequent machine configuration may necessitate the asymmetry in Fig. 9a even to reinforce. This can be achieved by using longer lamellae 16 in the lower half of the nozzle 13 than in the upper half of the nozzle 13.
  • Fig. 11a agrees largely with Fig. 8a match.
  • the flexible separating element 19 is merely replaced by a rigid separating element 20.
  • Fig. 11b Consequently, a symmetrical layer orientation also results here.
  • Rigid separators are generally used to separate the die space into at least two die subspaces in which different pressures can be maintained for the purpose of generating different jet velocities, respectively.
  • Fig. 12a differs from the variant according to Fig. 11a by an asymmetrical lamellar arrangement, so that according to Fig. 12b also gives an asymmetric layer orientation.
  • Fig. 13a a variant with a rigid separating element 20 is shown, in which an asymmetrical nozzle 13 is combined with inversely asymmetrical lamellae 16, so that a symmetrical layer orientation results.
  • the preferably long and short lamellae 16 in the two nozzle subspaces of the nozzle 13 move in certain length ranges relative to the corresponding aperture 14, in particular in the case of the continuously convergent nozzles.
  • the short fins 16 are shorter in all cases. They are preferably in the range of less than -30 to -150 mm, in particular in the range of less than -50 to -100 mm.
  • Fig. 14a shows a variant with a rigid separator 20, asymmetric nozzle 13 and symmetrical blades 16. This results in an asymmetric layer orientation.
  • Fig. 15a again shows the variant of Fig. 11a , wherein it is additionally shown here according to arrows 21 and 22 that the flow velocities v1 and v2 in the upper half of the headbox and in the lower half of the headbox can be chosen differently.
  • Fig. 15b1, b2 and b3 It shows how the layer orientations are adjusted depending on the speed conditions.
  • Fig. 15b1 shows the case that velocities v1 and v2 are the same
  • Fig. 15b2 shows the case that the speed v1 in the upper half of the headbox is greater than the speed v2 in the lower half and Fig. 15b3 the opposite case.
  • Fig. 15b1 a symmetric layer orientation
  • Fig. 15b2 an asymmetric layer orientation with high anisotropy in the upper half of the fibrous web
  • Fig. 15b3 an asymmetric layer orientation with high anisotropy in the lower half of the fibrous web.
  • Fig. 16a shows a further variant of a headbox with two rigid separating elements. Accordingly, three different speeds v1, v2 and v3 can be set. If all velocities v1 to v3 are set the same, a uniform layer orientation results over the thickness of the fibrous web, as in Fig. 16a shown. By appropriate different choice of speeds v1 to v3, the layer orientation can be selected in the desired manner, in particular also different on the top 17, the bottom 18 and in the center 24 of the fibrous web.
  • FIG. 17a to 17d Finally show further different variants of a headbox with a directly flanged manifold. The supply of the respective system thus takes place from a manifold.
  • the flow rates in the individual layers can be adjusted in different ways.
  • the friction conditions of the flow in the individual layers of the nozzle can be influenced.
  • Fig. 17a indicated by the double arrow 26 by means of a pivoting of the rigid blade 27 out of the neutral position and / or by a change in the flow resistance in the respective upstream of the nozzle turbulence generators T1, T2. This is particularly advantageous when both layers are supplied by a distributor tube.
  • each layer separately with pulp suspension, for example via separate distributor tubes.
  • the flow rate is tax-related or adjustable.
  • length-adjustable lamellae and / or variable-shape lamellae for the targeted change of the fluid friction conditions for changing the flow velocities in the respective layers and thus for adjusting the layer orientation.
  • Long lamellae increase the friction and thereby support the anisotropy of the fiber layer, as well as a possible thickening of a lamella and the resulting constriction of a flow channel.
  • Headbox shown with rigid separation blade 27 can be set by the position of the lip support 28, 29 different flow velocities in the individual layers and thus the layer orientation can be influenced.
  • the positioning of the lip supports 28, 29 can be done, for example, by a respective pivoting (double arrows 30, 31) when changing the lip openings.
  • the existing driving pressure gradient is more or less displaced into the nozzle. This results in different jet speeds. For example, increasing the gap opening by 5% (5% throughput reduction) increases the pressure loss by 10.25% in one shift. At a pressure drop of 500 mbar, this means a pressure reduction of 50 mbar. This achieves, depending on the jet speed, for example at 1200 m / min, a relevant change in the differential speed, for example about - 15 m / min.
  • the Indian Fig. 17c Headbox presented basically makes a combination of the headboxes of the two Fig. 17a and 17b
  • a change in the pressure loss in the turbulence generator T1, T2 can by actively changing the Flow cross-section, for example by introduction or replacement of inserts, by slide and / or by valves, of one or more lines in one layer or two layers.
  • the control is performed on one side of a line, since the flow differences in the percentage range at the nozzle start are not relevant, have a strong impact in the area of sheet formation in the percent range.
  • the control of the jet velocity is carried out by a dynamic pressure control by pressure transmitter in each layer.
  • Fig. 17d headbox is a further development of in the Fig. 17c illustrated headbox.
  • the illustrated headbox also has a known to the expert white water dosing system 32, as for example in the German patent DE 40 19 593 C2 is described.
  • press concepts with, in particular, an extended press nip (shoe press) can be advantageously used.
  • shoe press In these types of press, despite the exercise of a pressing operation, the specific volume, the so-called bulk, can be obtained.
  • a possible press concept with only one long press nip with a press nip length> 300 mm, preferably> 400 mm, is, for example, in the German Offenlegungsschriften DE 10 2004 050 593 A1 or DE 10 2004 039 785 A1 described.
  • both press gaps can be formed from shoe presses.
  • a press concept with two press nips wherein the first press nip is a nip press nip and the second press nip is a shoe press nip, represents a volume-saving combination.
  • the nip press nip for example, by an overhead and deflection-controlled roll and by an opposing Saugpresswalze formed. Since the fibrous web has a dry content of less than 25% at the inlet to the press section, only small compression pressures are necessary to dewater relatively large amounts of water. These can be easily removed through the suction press roll.
  • FIG. 18 An exemplary and advantageous machine configuration 100 for the production of curlar and wood free copy papers having a high specific volume is disclosed in U.S.P. FIG. 18 shown.
  • the machine configuration 100 is shown in a total of four partial views, which are marked with the following arrows A, B and C with regard to their sequence.
  • the pulp suspension 101 is fed via a two-layer headbox 102 to a former 103 in the form of a twin-wire former, wherein pulp suspension 101 from the same substance source 104 is fed into each layer of the headbox 102.
  • the headbox 102 further includes a rigid separator blade 105 which projects from the nozzle 106 and thus divides it into two halves. Each half is fitted with flexible laminations 107, 108 between each row of tubes of the associated turbulence generator 109, 110. These flexible laminations 107, 108 terminate within the nozzle 106 and are symmetrically populated in this example, and moreover two diaphragms 111, 112 are provided.
  • the former 103 comprises a forming roll 113 and a forming suction 114 which are not disposed on the same side.
  • the Indian Fig. 18 Shaper shown in a suitable manner with in the Fig. 4a to 16a and 17a to 17d combined headbox variants become. Furthermore, the shaper shown also as a in the Fig. 1a . 2a and 3a be performed executed form variant.
  • the press section 116 consists of a first nip press 117 with an upper and deflection-controlled roller 118 and a lower suction press roller 119.
  • the second and last press nip 120 is formed by a respective shoe roller 121, 122.
  • the fibrous web 115 is now with a transfer belt 123 to a so-called impingement drying device 124, as for example from the already mentioned German Offenlegungsschrift DE 10 2004 039 785 A1 is known, transferred.
  • the advantage here is the closed web guide up to a dry content of over 60% or 63%. This allows a high production speed for this fibrous web 115 of ⁇ 1,500 m / min, in particular ⁇ 1,650 m / min.
  • pre- dryer section 125 This is followed by a known single-row (pre-) dryer section 125 with several dryer groups 126.
  • Essential for high production speeds is a supported web guide equipped with stabilizers 127 between the drying cylinders 128.
  • At least one coating device 129 follows for preferably two-sided and indirect application of a liquid or pasty medium 130, 131, in particular glue.
  • glue 130, 131 reduces, for example, the dusting of the copy paper in the copier.
  • a post-dryer section 134 which includes both single-row dryer groups 135 and two-row dryer groups 136.
  • a symmetrical drying of the double-sided glue application can be achieved.
  • a slightly different glue application The two sides of the fibrous web 115 would lead to different Trocknungsverculturen and thus in turn to Curlne Trent.
  • the two-nip calender 137 may also be generally designed as a calender.

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  • Treatment Of Fiber Materials (AREA)

Claims (16)

  1. Dispositif de fabrication d'une bande de matière fibreuse (115), notamment une bande de papier, comprenant une caisse de tête (1 ; 102) ainsi que d'autres constituants, comme un formeur (2 ; 103), une section de pressage (3 ; 116), une section de séchage (125, 134), un dispositif d'enduction (129) et/ou une calandre (137),
    la configuration de la caisse de tête (1 ; 102), seule ou en combinaison avec la configuration d'au moins un autre constituant, étant choisie de telle sorte que l'on obtienne un profil souhaité de l'orientation de couche dans la direction z en termes d'influence sur le cintrage de la bande de matière fibreuse (115),
    caractérisé en ce
    qu'un formeur (2 ; 103) avec un rouleau de formage (5 ; 113) disposé sur le côté supérieur (17) de la bande de matière fibreuse (115) est combiné avec une caisse de tête (1 ; 102) qui provoque une orientation de couche asymétrique correspondante, et
    en ce que la caisse de tête (1 ; 102), pour réaliser l'orientation de couche asymétrique, présente une buse asymétrique (13 ; 106) et/ou un agencement de lamelles asymétrique (16 ; 107, 108) et/ou une structure à deux ou plusieurs couches avec des vitesses de couche différentes (v1 à v3).
  2. Dispositif selon la revendication 1,
    caractérisé en ce que
    le choix est fait de telle sorte que l'on obtienne une orientation de couche symétrique par rapport au plan médian dans la direction z de la bande de matière fibreuse (115).
  3. Dispositif selon la revendication 1 ou 2,
    caractérisé en ce que
    le choix est fait de telle sorte qu'avant le dispositif d'enduction (129), on obtienne une tendance souhaitée au cintrage, de préférence un cintrage nul, dans la bande de matière fibreuse (115).
  4. Dispositif selon la revendication 1, 2 ou 3,
    caractérisé en ce que
    le choix est fait de telle sorte que l'on obtienne une tendance souhaitée au cintrage, de préférence un cintrage nul, dans la bande de matière fibreuse (115) finie.
  5. Dispositif selon l'une quelconque des revendications précédentes,
    caractérisé en ce
    qu'au moins un autre constituant du dispositif est pris en compte en termes de son influence sur le profil de l'orientation de couche lors du choix.
  6. Dispositif selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    le formeur (2 ; 103) présente un dispositif d'aspiration de formage (7 ; 114) disposé sur le côté supérieur (17) ou le côté inférieur (18) de la bande de matière fibreuse (115).
  7. Dispositif selon l'une quelconque des revendications précédentes,
    caractérisé en ce que
    la caisse de tête (1 ; 102) est construite en une, deux ou plusieurs couches.
  8. Dispositif selon la revendication 7,
    caractérisé en ce que
    dans le cas d'une caisse de tête (1 ; 102) à deux ou plusieurs couches, une asymétrie de la buse (13 ; 106) et/ou des lamelles (16 ; 107, 108) de la caisse de tête est compensée par différentes vitesses de couche (v1 à v3) de la suspension de matière fibreuse (101).
  9. Procédé de fabrication d'une bande de matière fibreuse (115), en particulier d'une bande de papier, dans lequel une suspension de matière fibreuse (101) est introduite au moyen d'une caisse de tête (1 ; 102) dans un formeur (2 ; 103) et est ensuite traitée subséquemment au moyen d'autres constituants comme une section de pressage (3 ; 116), une section de séchage (125, 134), un dispositif d'enduction (129) et/ou une calandre (137),
    la configuration et/ou le fonctionnement de la caisse de tête (1 ; 102), seuls ou en combinaison avec la configuration et/ou le fonctionnement d'au moins un autre constituant, étant choisis de telle sorte que l'on obtienne un profil souhaité de l'orientation de couche dans la direction z en termes d'influence sur le cintrage de la bande de matière fibreuse (115),
    caractérisé en ce
    qu'un formeur (2 ; 103) avec un rouleau de formage (5 ; 113) disposé sur le côté supérieur (17) de la bande de matière fibreuse (115) est combiné avec une caisse de tête (1 ; 102) qui provoque une orientation de couche asymétrique correspondante, et
    en ce que la caisse de tête (1 ; 102), pour réaliser l'orientation de couche asymétrique, est pourvue d'une buse asymétrique (13 ; 106) et/ou de lamelles asymétriques (16 ; 107, 108) et/ou est réalisée sous forme d'une structure à deux ou plusieurs couches, les vitesses de couche (v1 à v3) de la suspension de matière fibreuse (101) étant choisies en conséquence de manière différente.
  10. Procédé selon la revendication 9,
    caractérisé en ce que
    le choix est fait de telle sorte que l'on obtienne une orientation de couche symétrique par rapport au plan médian dans la direction z de la bande de matière fibreuse (115).
  11. Procédé selon la revendication 9 ou 10,
    caractérisé en ce que
    le choix est fait de telle sorte qu'avant le dispositif d'enduction (129), on obtienne une tendance souhaitée au cintrage, de préférence un cintrage nul, dans la bande de matière fibreuse (115).
  12. Procédé selon la revendication 9, 10 ou 11,
    caractérisé en ce que
    le choix est fait de telle sorte que l'on obtienne une tendance souhaitée au cintrage, de préférence un cintrage nul, dans la bande de matière fibreuse (115) finie.
  13. Procédé selon l'une quelconque des revendications 9 à 12,
    caractérisé en ce
    qu'au moins un autre constituant du dispositif est pris en compte en termes de son influence sur le profil de l'orientation de couche lors du choix.
  14. Procédé selon l'une quelconque des revendications 9 à 13,
    caractérisé en ce que
    le formeur (2 ; 103) est pourvu d'un dispositif d'aspiration de formage (7 ; 114) disposé sur le côté supérieur (17) ou le côté inférieur (18) de la bande de matière fibreuse (115).
  15. Procédé selon l'une quelconque des revendications 9 à 14,
    caractérisé en ce que
    la caisse de tête (1 ; 102) est construite en une, deux ou plusieurs couches.
  16. Procédé selon la revendication 15,
    caractérisé en ce que
    dans le cas d'une caisse de tête (1 ; 102) à plusieurs couches, la vitesse de couche (v1 à v3) de la suspension de matière fibreuse (101) est choisie de telle sorte qu'une asymétrie de la buse (13 ; 106) et/ou des lamelles (16 ; 107, 108) de la caisse de tête (1 ; 102) soit compensée.
EP07113086A 2006-10-13 2007-07-25 Procédé et dispositif destinés à la fabrication d'une bande fibreuse Not-in-force EP1911876B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07113086T PL1911876T3 (pl) 2006-10-13 2007-07-25 Urządzenie i sposób wytwarzania pasma z materiału włóknistego

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006049078A DE102006049078A1 (de) 2006-10-13 2006-10-13 Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn

Publications (2)

Publication Number Publication Date
EP1911876A1 EP1911876A1 (fr) 2008-04-16
EP1911876B1 true EP1911876B1 (fr) 2011-01-26

Family

ID=38917668

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07113086A Not-in-force EP1911876B1 (fr) 2006-10-13 2007-07-25 Procédé et dispositif destinés à la fabrication d'une bande fibreuse

Country Status (4)

Country Link
EP (1) EP1911876B1 (fr)
AT (1) ATE497056T1 (fr)
DE (2) DE102006049078A1 (fr)
PL (1) PL1911876T3 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI125186B (fi) 2011-01-11 2015-06-30 Valmet Technologies Inc Menetelmä ja laitteisto kuiturainakoneella valmistettavan kuiturainan z-suuntaisen anisotropian hallitsemiseksi
DE102021109340B4 (de) 2021-04-14 2024-02-15 Voith Patent Gmbh Maschine und Verfahren zur Herstellung einer Faserstoffbahn

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH613241A5 (en) * 1976-12-09 1979-09-14 Escher Wyss Gmbh Headbox device for a papermachine
US5798024A (en) * 1996-06-11 1998-08-25 Valmet Corporation Controlling web anistropy in a roll and blade twin-wire gap former
FI105935B (fi) * 1996-12-03 2000-10-31 Valmet Corp Menetelmä paperin kuivaamiseksi sekä paperikoneen kuivapää
US8261465B2 (en) * 2002-09-10 2012-09-11 Voith Paper Patent Gmbh Equipment and method for producing and/or treating a fibrous web

Also Published As

Publication number Publication date
DE502007006357D1 (de) 2011-03-10
DE102006049078A1 (de) 2008-04-17
PL1911876T3 (pl) 2011-05-31
ATE497056T1 (de) 2011-02-15
EP1911876A1 (fr) 2008-04-16

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