EP1911879A1 - 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
EP1911879A1
EP1911879A1 EP07118045A EP07118045A EP1911879A1 EP 1911879 A1 EP1911879 A1 EP 1911879A1 EP 07118045 A EP07118045 A EP 07118045A EP 07118045 A EP07118045 A EP 07118045A EP 1911879 A1 EP1911879 A1 EP 1911879A1
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EP
European Patent Office
Prior art keywords
headbox
layer
fibrous web
former
nozzle
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Withdrawn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
EP07118045A
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German (de)
English (en)
Inventor
Wolfgang Ruf
Hans Loser
Markus Häußler
Klaus Lehleiter
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.)
Voith Patent GmbH
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Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1911879A1 publication Critical patent/EP1911879A1/fr
Withdrawn legal-status Critical Current

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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
    • 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
    • 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
    • D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers

Definitions

  • the present invention relates to a device for producing a fibrous web, in particular a paper web, with 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.
  • 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.
  • alignment in the machine direction is limited due to the increased microturbulence.
  • 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.
  • This object is achieved in a device of the type mentioned above in that the design and / or operation of the headbox alone or in combination with the design and / or operation of at least one further component is selected so that a desired profile of the layer orientation in the z direction with respect to a curl influence of the fibrous web.
  • the object is achieved in that the design and / or operation of the headbox alone or in combination with the design and / or operation of at least one further component is selected so that a desired profile of the layer orientation in the z direction with respect to a curl influence of the fibrous web.
  • 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.
  • a former can be combined with a forming roller arranged on the upper side of the fibrous web with a headbox which causes a corresponding asymmetrical layer orientation.
  • the one-sided vacuum leads to a different level of orientation on the top and bottom of the fibrous web. This is exacerbated when the forming sucker is placed after the forming roll with its vacuum on the same side as the forming roll. Since the vacuum level also affects other paper properties such as formation and dry content, the vacuum can not be used solely for setting a desired profile of the layer orientation.
  • a desired profile of the layer orientation can therefore be achieved only by the inventive combination of the former with a headbox with a corresponding asymmetric layer orientation.
  • the head box can in particular have an asymmetrical nozzle and / or an asymmetric lamella arrangement.
  • the headbox may be constructed in two or more layers and operated in the different layers with different layer speed. The different layer speeds also result in a different layer orientation, since the fiber orientation also increases with increasing flow velocity.
  • a former having a forming roller arranged on the underside of the fibrous web is combined with a headbox which causes a symmetrical layer orientation. It has been found that formers thus formed cause a symmetrical layer orientation. By combining with a headbox, which also causes a symmetrical layer orientation, a total of symmetrical Layer orientation produced in the produced fibrous web. This results in an advantageous manner and symmetrical properties of the fibrous web.
  • a symmetrical layer orientation through the head box can be achieved in particular by the fact that the headbox has a symmetrical nozzle and a symmetrical lamellar arrangement or an asymmetric nozzle and a correspondingly inversely asymmetrical lamellar arrangement.
  • Another possibility is to compensate for an asymmetry of the nozzle and / or the fins of the headbox by different flow velocities in the layers of the headbox in a two- or multi-layered headbox.
  • an increased flow velocity or shear flow leads to a higher orientation of the fibers, so that a lower orientation of the fibers can be compensated by the geometrical configuration of the headbox in a layer by a correspondingly increased flow velocity in this layer.
  • 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 layer speed is adjusted symmetrically by an average speed according to an embodiment of the invention.
  • the layer speed difference and the material densities in the layers can therefore be set independently of each other.
  • a further embodiment of the invention is in the selection in addition the difference of the average over all layers layer velocity and the Screening speed taken into account. It has been shown that this difference has an influence on the possible change in the profile of the layer orientation. Namely, the smaller the difference of the average film speed and the wire speed, the greater the effect of a difference in the film speeds.
  • the difference is set to a maximum of +/- 100 m / min, preferably a maximum of +/- 50 m / min. This ensures a good influence on the profile of the layer orientation.
  • the difference of the layer speeds between the individual layers is set to a maximum of 100 m / min, preferably to a maximum of 60 m / min in a two- or multi-layer headbox. This sheet deformation can be avoided.
  • the invention preferably sets a ratio of the breaking length ratios between the upper side of the sheet and the lower side of the sheet of 1 +/- 0.5, in particular 1 +/- 0.2. These values have proved to be suitable and advantageous.
  • the former shown in Fig. 1a 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 in the lower sieve loop 4.
  • 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 shows that a symmetrical layer orientation results from such a former configuration.
  • 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 each over again Guide rollers 8 out, and there are also a suction device 9 and a Siebsaugwalze 10 is provided, with the suction device 9 is this time in the upper wire loop 6 and the wire suction roll 10 again in the lower wire 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 thus on the upper side of the fibrous web.
  • Fig. 2b results from such a Shaper design an asymmetric layer orientation.
  • the jet velocity is greater than the sieve speed.
  • the forming roller 5 is located on the upper side of the fibrous web.
  • the forming suction 7 is on the upper side 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 is consistent with the variant of FIG. 2.
  • Fig. 3b results from such a former design an asymmetric layer orientation.
  • the jet velocity is greater than the sieve speed.
  • the forming roller 5 shown in FIGS. 1a, 2a and 3a can also be formed by a stationary dewatering element, such as, for example, an evacuated or non-evacuated and preferably curved shoe. In the further dewatering process, at least one evacuated forming roller can then follow.
  • a stationary dewatering element such as, for example, an evacuated or non-evacuated and preferably curved shoe.
  • the illustrated in Fig. 4a first variant of 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.
  • 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 nozzle configuration is identical to that of FIG. 4a.
  • the slats 16 are arranged asymmetrically here.
  • FIG. 5b the combination of an asymmetric nozzle 13 with inversely asymmetrical lamellae 16 results in a symmetrical layer orientation.
  • both the nozzles 13 and the lamellae are formed symmetrically. Accordingly, as shown in Figs. 6b and 7b, a symmetric layer orientation results.
  • FIG. 8a differs from the variant according to FIG. 6a only by an additional flexible separating element 19 in the middle of the headbox.
  • Fig. 8b again shows the symmetric layer orientation.
  • FIG. 9 a also has a flexible separating element 19.
  • the nozzle design here is asymmetrical, so that as shown in Fig. 9b, results in an asymmetric layer orientation.
  • FIG. 10a shows a further variant, which differs from the variant according to FIG. 9a only in that here the lamellae are inversely arranged asymmetrically.
  • the asymmetrical nozzle configuration is compensated so that, according to FIG. 10b, a symmetrical layer orientation results.
  • the subsequent machine configuration may make it necessary to even increase the asymmetry in Figure 9a. 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 is largely consistent with Fig. 8a.
  • the flexible separating element 19 is merely replaced by a rigid separating element 20. Consequently, according to FIG. 11b, 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 lamella arrangement, so that, according to FIG. 12b, an asymmetrical layer orientation also results.
  • FIG. 13a again shows a variant with a rigid separating element 20, 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 rigid separating element 20, asymmetric nozzle 13 and symmetrical lamellae 16. This results in an asymmetrical layer orientation.
  • FIG. 15a again shows the variant of FIG. 11a, wherein here additionally according to arrows 21 and 22 it is shown 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.
  • FIGS. 15b1, b2 and b3 show how the layer orientations are set as a function of the speed ratios.
  • Fig. 15b1 shows the case that the velocities v1 and v2 are equal
  • Fig. 15b2 shows the case that the velocity v1 in the upper half of the headbox is greater than the velocity v2 in the lower half
  • Fig. 15b3 the reverse case
  • FIG. 15b1 a symmetrical layer orientation results, according to FIG. 15b2 an asymmetrical layer orientation with high anisotropy in the upper half of the fibrous web and according to FIG. 15b3 an asymmetric layer orientation with high anisotropy in the lower half of the fibrous web.
  • Fig. 16a shows another 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 shown in FIG. 16a. 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.
  • FIGS. 17a to 17d show further different variants of a headbox with a respective directly flanged distribution tube.
  • 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.
  • the friction conditions of the flow in the individual layers of the nozzle can be influenced.
  • 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.
  • different flow velocities in the individual layers can be set by the position of the lip supports 28, 29, 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 headbox shown in Fig. 17c basically represents a combination of headboxes of both Figs. 17a and 17b.
  • a change in pressure loss in the turbulence generator T1, T2 can be achieved by actively changing the flow cross-section, for example by inserting or replacing inserts, with slides and / or by valves, of one or more lines in one layer or both 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 a development of the headbox shown in Fig. 17c.
  • the illustrated headbox also has a well-known in the art White water metering system 32, as shown 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, is a volume saving combination.
  • the nip press nip is formed, for example, by an overhead and deflection controlled roll and by an opposing suction press roll. 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. 1 An exemplary and advantageous machine configuration 100 for the production of curlar and wood free copy papers with a high specificity Volume is shown in FIG.
  • 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 former illustrated in FIG. 18 may be suitably combined with the headbox variants shown in FIGS. 4a through 16a and 17a through 17d. Furthermore, the illustrated former can also be designed like a former variant embodied in FIGS. 1 a, 2 a and 3 a.
  • 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% and 63% respectively. 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 dryer 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 application of glue on the two sides of the fibrous web 115 would lead to different drying processes and thus in turn to curl tendency.
  • the two-nip calender 137 may also be generally designed as a calender.
  • the former variants illustrated in FIGS. 1a, 2a and 3a can now be combined in a suitable manner with the headbox variants shown in FIGS. 4a to 16a, 17a to 17d and 18, depending on which layer orientation is desired.
  • Combinations of multilayer headboxes with the formers of Fig. 1a, 2a and 3a since by the different flow rates can be set in a particularly advantageous manner desired layer orientations.
  • the asymmetry of the layer orientation can be compensated for by the formers of Figures 2a and 3a by correspondingly reversed asymmetric headboxes, while the symmetrical former of Figure 1a can be combined with a symmetrical headbox to achieve symmetric layer orientation.
  • a desired layer orientation can be set by selecting the embodiments of headbox and former according to the invention.
  • the headbox is formed here with a rigid separator 20. As shown by arrows 33 and 34, 20 different layer speeds are set above and below the rigid separator. This results in different film speeds v1 and v2 on the upper side of the sheet and the underside of the sheet even after exiting the nozzle 13. The average speed is shown by arrow vm.
  • the rigid separating element 20 has a projection of +/- 60 mm, preferably> 0 mm, over the nozzle 13 of the headbox 1.
  • the sieves 4 of the forming rollers 5 of the former 2 have a screen speed vs.
  • the difference between the average speed vm and the screen speed vs is preferably at most 100 m / min, in particular at most 60 m / min.
  • the difference between the layer velocity v1 and the layer velocity v2 is a maximum of 100 m / min, preferably a maximum of 60 m / min.
  • the differences are each set such that a desired profile of the layer orientation results, wherein the difference between the screen speed vs and the average speed vm can be used to set the influence of the difference between the layer speeds v1 and v2 on the profile of the layer orientation.

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EP07118045A 2006-10-13 2007-10-08 Procédé et dispositif destinés à la fabrication d'une bande fibreuse Withdrawn EP1911879A1 (fr)

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DE200610049025 DE102006049025A1 (de) 2006-10-13 2006-10-13 Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2025809A3 (fr) * 2007-08-04 2012-10-31 Voith Patent GmbH Procédé pour influencer de la dualité de l'orientation de couche et caisse de tête destinée à l'exécution du procédé
WO2019136254A1 (fr) * 2018-01-05 2019-07-11 International Paper Company Produits papetiers ayant une résistance à la flexion et une résistance dans le sens travers accrues et leurs procédés de fabrication
RU2771694C2 (ru) * 2018-01-05 2022-05-11 Интернэшнл Пэйпа Кампани Бумажные изделия, имеющие повышенную жесткость при изгибе и прочность в поперечном направлении, и способы их изготовления

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DE2658844A1 (de) * 1976-12-09 1978-06-22 Escher Wyss Gmbh Stoffauflaufvorrichtung fuer eine papiermaschine
DE4307143A1 (de) * 1993-03-06 1994-09-08 Voith Gmbh J M Strahlgeschwindigkeitsbeeinflussung im Mehrschichtenstoffauflauf
WO1997047803A1 (fr) 1996-06-11 1997-12-18 Valmet Corporation Formeur d'espace a double toile avec rouleau et lame pour machine a papier
WO1998027273A1 (fr) * 1996-12-03 1998-06-25 Valmet Corporation Procede de sechage et du papier et section seche d'une machine a papier
DE10259606A1 (de) * 2002-12-19 2004-07-29 Voith Paper Patent Gmbh Verfahren zur Herstellung einer Faserstoffbahn
US20050144802A1 (en) 2002-09-10 2005-07-07 Voith Paper Patent Gmbh Equipment and method for producing and/or treating a fibrous web

Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
DE2658844A1 (de) * 1976-12-09 1978-06-22 Escher Wyss Gmbh Stoffauflaufvorrichtung fuer eine papiermaschine
DE4307143A1 (de) * 1993-03-06 1994-09-08 Voith Gmbh J M Strahlgeschwindigkeitsbeeinflussung im Mehrschichtenstoffauflauf
WO1997047803A1 (fr) 1996-06-11 1997-12-18 Valmet Corporation Formeur d'espace a double toile avec rouleau et lame pour machine a papier
WO1998027273A1 (fr) * 1996-12-03 1998-06-25 Valmet Corporation Procede de sechage et du papier et section seche d'une machine a papier
US20050144802A1 (en) 2002-09-10 2005-07-07 Voith Paper Patent Gmbh Equipment and method for producing and/or treating a fibrous web
DE10259606A1 (de) * 2002-12-19 2004-07-29 Voith Paper Patent Gmbh Verfahren zur Herstellung einer Faserstoffbahn

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2025809A3 (fr) * 2007-08-04 2012-10-31 Voith Patent GmbH Procédé pour influencer de la dualité de l'orientation de couche et caisse de tête destinée à l'exécution du procédé
WO2019136254A1 (fr) * 2018-01-05 2019-07-11 International Paper Company Produits papetiers ayant une résistance à la flexion et une résistance dans le sens travers accrues et leurs procédés de fabrication
WO2019136250A1 (fr) * 2018-01-05 2019-07-11 International Paper Company Produits papetiers ayant une rigidité en flexion et une résistance en sens travers accrues et leurs procédés de fabrication
RU2771694C2 (ru) * 2018-01-05 2022-05-11 Интернэшнл Пэйпа Кампани Бумажные изделия, имеющие повышенную жесткость при изгибе и прочность в поперечном направлении, и способы их изготовления
US11441268B2 (en) 2018-01-05 2022-09-13 International Paper Company Paper products having increased bending stiffness and cross-direction strength and methods for making the same

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