EP0195807A1 - Headbox system for a paper machine. - Google Patents

Headbox system for a paper machine.

Info

Publication number
EP0195807A1
EP0195807A1 EP19850904806 EP85904806A EP0195807A1 EP 0195807 A1 EP0195807 A1 EP 0195807A1 EP 19850904806 EP19850904806 EP 19850904806 EP 85904806 A EP85904806 A EP 85904806A EP 0195807 A1 EP0195807 A1 EP 0195807A1
Authority
EP
European Patent Office
Prior art keywords
width
guide
flow
suspension
branches
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.)
Granted
Application number
EP19850904806
Other languages
German (de)
French (fr)
Other versions
EP0195807B2 (en
EP0195807B1 (en
Inventor
Elmer Weisshuhn
Alfred Bubik
Hans Dahl
Herbert Holik
Rudiger Kurtz
Anton Zembrot
Wolf-Gunter Stotz
Werner Seider
Robert Trondle
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.)
Sulzer Escher Wyss GmbH
Sulzer Escher Wyss GmbH
Original Assignee
Sulzer Escher Wyss GmbH
Escher Wyss 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
Family has litigation
Priority to CH448984 priority Critical
Priority to CH4489/84 priority
Priority to CH915/85 priority
Priority to CH91585 priority
Application filed by Sulzer Escher Wyss GmbH, Escher Wyss GmbH filed Critical Sulzer Escher Wyss GmbH
Priority claimed from AT85904806T external-priority patent/AT47438T/en
Priority to PCT/EP1985/000473 priority patent/WO1986001844A1/en
Publication of EP0195807A1 publication Critical patent/EP0195807A1/en
Publication of EP0195807B1 publication Critical patent/EP0195807B1/en
Application granted granted Critical
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=25686098&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0195807(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Publication of EP0195807B2 publication Critical patent/EP0195807B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00Wet end of machines for making continuous webs of paper
    • D21F1/02Head boxes of Fourdrinier machines
    • D21F1/022Means for injecting material into flow within the headbox
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00Wet end of machines for making continuous webs of paper
    • D21F1/02Head boxes of Fourdrinier machines
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00Wet end of machines for making continuous webs of paper
    • D21F1/02Head boxes of Fourdrinier machines
    • D21F1/024Details of the feed chamber
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00Wet end of machines for making continuous webs of paper
    • D21F1/02Head boxes of Fourdrinier machines
    • D21F1/026Details of the turbulence section
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00Wet end of machines for making continuous webs of paper
    • D21F1/02Head boxes of Fourdrinier machines
    • D21F1/028Details of the nozzle section
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00Wet end of machines for making continuous webs of paper
    • D21F1/06Regulating pulp flow

Abstract

In a headbox system for a paper machine, characterized by an adjustable distribution of the pulp over the width of the strip, the passage of the pulp through the spacing of the output rollers (8) is controlled so that the distribution of the fibers across the width of the strip also has a desired profile with respect to the orientation and quantity of the fibers. For this purpose, the flow of the dough is controlled so that if the distribution of the dough changes over the width of the strip, the horizontal component of the direction of flow in the outlet gap remains, at any time, and in any place, oriented in the direction of the machine, which makes it possible to avoid any transverse flow and to obtain a predetermined profile in the outlet gap (8).

Description

Headbox device for a paper machine and method for its operation

Technical field

The invention relates to a headbox device for a paper machine with a distribution box for distributing a stock suspension supplied over the web width of the paper machine, a guide device for the stock suspension having a plurality of holes or channels and a subsequent nozzle space with an outlet gap for distributing the stock suspension with a specific one Weight per unit area over the web width of the paper machine, the mass distribution over the web width of the paper machine optionally being changeable by locally changing the width of the outlet gap and / or by locally changing the consistency, and a method for operating such a device. State of the art

Such headbox devices are known, for example, from US Pat. No. 4,087,321. They are used to feed a prepared pulp suspension to a paper machine and to distribute it over its entire web width in a certain way. This distribution of the material suspension should take place in such a way that the paper web produced with the paper machine has certain properties over the web width, with usually a uniform weight per unit area (mass per unit area) after drying, a uniform moisture content, and a uniform fiber orientation over the entire web width is sought.

From US Pat. No. 3,556,935 or US Pat. No. 4,089,739 it is known to design the width of the outlet gap of the nozzle space to be adjustable by means of a plurality of adjusting devices distributed over the web width. With this, the amount of material suspension can be determined via the

Control web width, but not fiber orientation.

Inadequacies in the construction of the paper machine, as well as physical processes during the paper manufacturing process, are the reason why not all of the desired properties across the web width are usually the same as desired or even. For example, defects in the wire section or the shrinkage of the paper web during drying, in particular at the web edge, are compensated for by changes in the local mass flow, as are deficiencies in the geometry of the distributor Guide device or the nozzle space. In order to change or set a certain local mass flow, the width of the outlet gap from the nozzle space is often changed locally. However, this also locally changes the pressure in the nozzle area and the pressure curve in the fiber suspension over the machine width is uneven. These local pressure differences in the nozzle area lead to transverse flows in the nozzle area, which have an effect right up to the outlet gap, in such a way that the direction of the flow in the nozzle area, seen across the width, is not exactly parallel and corresponds to the machine direction. Even small deviations from the machine direction lead to undesirable nonuniformity in the fiber orientation of the paper web produced across the web width because of the transverse components of the speed vector which exist when the suspension beam emerges.

From AT-363 776 it is already known to compensate for pressure differences in the flowing stock suspension in the distributor over the web width in that the stock suspension is additionally fed or withdrawn stock suspension at suitable points, for example in the distribution box, so that the pressure curve in the distribution box is constant over the entire web width. However, this measure alone cannot compensate for all pressure differences in the nozzle area.

From US-3,573,160 it is known to increase the speed profile of the stock suspension over the web width Measure and adjust the cross-section of the distributor accordingly, eg using an adjustable wall, in order to achieve a uniform speed of the suspension in the outlet gap. This also means that pressure differences and cross flows can only be prevented incompletely.

As described in GB-1 216 114, attempts have also already been made to achieve a uniform flow of material through a plurality of individually adjustable overflow tubes on the distribution box, whereby the disadvantages mentioned cannot be avoided either.

For example, in the nozzle area at the edges due to friction losses on the side walls

- Additional pressure losses, which have the effect that the pressure in the nozzle chamber and the flow of material through it drop towards the edge. This also causes cross currents in the nozzle area, with the result that the flow threads are no longer aligned exactly parallel in the machine direction.

In DE-A-2 151 906 it is proposed to achieve a uniform speed and quantity of material also in the edge area by providing a gap on the distributor which can be individually adjusted over the width. Differences in pressure and cross flows in the outlet gap are also present here.

Even in the case of a plurality of rows of bores or channels which are offset with respect to one another in the guide device, as disclosed, for example, in US Pat. No. 4,137,124, nonuniformities, such as lower material flows per unit of width, which likewise lead to pressure differences and to cross flows in the nozzle space and at the gap. This could be compensated for by supplying additional material suspension or water on the sides through the side walls of the nozzle space, but this entails considerable mechanical and control expenditure.

The invention sets itself the task of eliminating the above-mentioned disadvantages of the prior art and, in particular, of creating a headbox device for a paper machine and a method for operating it, with which, despite the transverse profiles desired for setting, of the basis weight necessary change of the local mass flow reaches a flow state in the nozzle space and at the outlet gap which is free of cross flows. A paper web produced in this way should have a uniform fiber orientation across the web width.

Presentation of the invention

These tasks are solved with the device according to the invention in that, even when the mass distribution is changed, the flow of the stock suspension in the nozzle space can be adjusted at the same time so that the horizontal component of the flow direction of the stock suspension is seen across the web width of the paper machine is parallel everywhere in the machine direction at the outlet gap and the flow velocity in the outlet gap, seen across the machine width, corresponds to a given profile. This can be done, for example, either by changing the pressure profile in the distributor, by changing the geometric dimensions of the distributor, the guide device or the nozzle space, or by supplying or removing material suspension or supplying water in the distributor in the Guide device or in the nozzle room, individually or in combination with one another.

These setting options ensure that the flow in the outlet gap is influenced in such a way that when the mass distribution is set to a desired cross profile, there are still no cross flows, and thus a paper with the desired mass distribution and with the desired, e.g. uniform fiber distribution with regard to quantity and orientation over the web width is obtained.

The method according to the invention for operating such a device is characterized in that when the mass distribution of the stock suspension is changed over the web width of the paper machine by local change in the width of the outlet gap and / or by local change in stock density, the flow at the same time the. The stock suspension in the headbox is adjusted such that it is seen across the web width of the paper machine, the horizontal component of the flow direction of the stock suspension at the outlet gap is parallel everywhere in the machine direction, and the flow speed in the outlet gap, seen across the machine width, corresponds to a predetermined profile , for example, is at least approximately the same. This can be done, for example, either by changing the print profile in the distribution box, by changing the geometry of the distribution box, the guide device or the nozzle space or by supplying or removing material suspension or supplying water in the distributor, in the guide device or in the nozzle space, individually or in combination with each other.

Brief description of the drawings

The invention, as well as advantageous developments of the same, are explained in more detail with reference to the exemplary embodiments shown in the figures.

FIG. 1 shows a headbox device in plan view.

FIGS. 2-4 show different designs of distribution boxes with an adjustable pressure curve in two vertical sections,

FIG. 5 shows a headbox device in a vertical section,

FIG. 6 shows a headbox device with various possible addition or removal points for stock suspension or addition points for water,

FIGS. 7 and 8 show guide devices with different geometries over the web width, Figures 9-11 show different arrangements of feed lines and branches on a headbox.

Description of exemplary embodiments of the invention

The headbox device shown in FIG. 1 has a distribution box 1, the cross section of which is reduced in the direction of flow F of the stock suspension. The substance suspension is e.g. to understand a mixture of fibers with additives for paper or cardboard manufacture, but also filler suspensions for paper coating. At the end of the distributor with the larger cross section, a connecting pipe 2 is connected to feed the stock suspension, and the other, opposite

End with 'the smaller cross section a return line 3. The distributor preferably has an approximately - conical shape or may be formed as a truncated pyramid.

A guide device 5 is connected to a longitudinal side 4 of the distributor 1. In principle, this can be designed as any guiding device customary in paper machine technology, for example, as shown in detail in the figure, as a step diffuser with gradually expanding parallel channels 6, e.g. according to CH 518 406 (US 3 725 197).

At the exit of these channels 6 there is a nozzle chamber 29 with an outlet gap 8, this being formed by two lips 7 or by a lip and one mounted on the lip, but opposite it freely movable aperture. The stock suspension now reaches the wire section of the paper machine via the channels 6, the nozzle chamber 29 and the outlet gap 8.

At least one of the lips 7 or an aperture attached to it is provided with a plurality of adjusting devices 30 distributed over the width, with which the gap width can be adjusted individually over the width manually or by means of a control device in order to use the gap 8 flowing material suspension flow a desired oven-dry basis weight profile of the paper web thus produced across the width. If, however, the gap width is changed locally via adjusting devices 30 at the outlet gap 8, the local flow conditions, such as pressure and speed in the nozzle space, also change in addition to the local mass flow and the basis weight profile. The result of the pressure differences are transverse flows in the nozzle space, which are present up to the outlet gap 8 and act on the fiber storage on the wire of the paper machine until the entire fiber structure is fixed in the sheet. Because of the different cross currents across the web width of the machine, there is then a different fiber storage in the sheet over the web width. To such

To prevent cross-flows of the material suspension, certain precautions are necessary. One of these possibilities is to readjust or readjust the pressure of the stock suspension over the web width of the paper machine or the width of the nozzle space while maintaining the set gap width profile. On the other hand, the gap width can also be constant are held and instead the material density is changed locally so that the desired cross profile, for example the oven-dry basis weight, arises in the paper web at constant pressure across the width. For this purpose, it is necessary to add or remove material suspension or water at suitable points, individually distributed over the width.

Similar to gap width adjustments, another phenomenon has an effect that arises from the fact that at the edges of the paper machine, as a result of frictional losses on the side walls 9, there is also a pressure loss in the stock suspension. Instead of compensating for this pressure loss by supplying suspension or water through the side walls 9 via additional lines 10, which means considerable mechanical and control expenditure, the necessary compensation can be carried out in a simpler and more precise manner by the same pressure regulation or material. density control or by the same change in the geometry as is necessary to maintain a certain basis weight profile with uniform fiber orientation. In the same way, the shrinkage occurring at the edges during the drying of paper webs can also be compensated for, so that a paper web is produced which is uniform over the entire web width.

Pressure compensation can be carried out individually or in combination with one another using various measures. One possibility for pressure compensation over the web width of the machine is that as in FIG 1, a plurality of branches, which are designed as branch lines 11, 12, 13 and 14 and are connected to the interior of the distributor 1, are connected to one longitudinal side of the distribution box 1 and distributed over its length. Controllable valves 15, 16, 17, 18, 19 are provided in these branch lines, by means of which the flow rate of the branch lines and the return line can be changed. The branch lines 11, 12, 13 and 14 and the return line 3 are connected, for example, to a common collecting line 20. The stock suspension branched off at the individual connection points of the branch lines and via the return line can be discharged via this. Depending on the amount of suspension removed in the individual branch lines, the hydrostatic pressure profile in the distributor 1 changes from the location of the connection of the relevant branch lines. The extent of the pressure change can be adjusted by means of the valves 15, 16, 17, 18 and 19, so that by actuating these valves it is possible to set the required pressure curve over the length of the distributor or the width of the paper machine. Due to the shape of the distributor 1, a certain pressure course in the distributor can initially be roughly predefined, so that only the remaining deviations have to be corrected by the actuation of the valves.

The pressure setting at the various setting points can either be done manually, by means of a visual pressure indicator or after observing the paper web produced, or according to the measurement results for certain paper properties, using suitable sensors were determined over the width of the paper web, for example the basis weight or the fiber orientation, or, as indicated in FIG. 1, with the aid of a control device 26 connected to the various measuring devices. Along the direction of flow F on the distributor 1 pressure measuring devices 21, 22, 23, 24 and 25 are provided, with which the hydrostatic pressure of the suspension in the distributor 1 or its course in the longitudinal direction is determined. In principle, such pressure measuring devices can be designed and arranged as desired, and the pressure measurement can also take place in the nozzle area. In the simplest case, the measuring devices can be assigned to the individual valves and control them directly, or the measuring devices can, independently of the valves, feed their measured values to the control device 26, which controls and adjusts the individual valves in a suitable manner, for example by means of a process computer until the desired pressure prevails at all measuring points.

The pressure profile predetermined by the control device 26 can be selected so that the pressure shows a desired course, for example is kept constant over the entire width, or certain edge corrections can be included, for example a somewhat higher pressure at both edges to compensate for pressure drops on the side walls. In addition, the control device 26 can also be controlled by further sensors, not shown, which, for example, determine the thickness, the basis weight, the curl (curl) or the fiber orientation of the paper produced. determine or measure along the width of the paper web and deliver corresponding additional control signals 28 by means of which an additional pressure correction can be carried out or a pressure profile can be specified. If suitable operating personnel are available, however, such a control can also be carried out in a simpler manner manually or semi-automatically by observing the measured values of the individual measuring devices and corresponding readjustment. Such a simple control is often sufficient, since a one-off adjustment after starting up a paper machine is usually sufficient and readjustment is only necessary if operating parameters, such as the pressure or the composition of the stock suspension, or if the production changes is changed, for example if the machine is changed over to a different type of stock suspension, which results in a change in the pressure distribution. With known headbox devices, this was only possible with difficulties and complications.

The cross section of the branch lines 11, 12, 13 and 14 can be different, depending on the necessary correction. Likewise, the mutual distance between these branch lines can be selected differently. However, it is also readily possible to provide lines of the same diameter at the same distance from one another, in a number that ensures the necessary controllability.

Instead of discharging part of the stock suspension via the branch lines, the branch lines can also serve to supply additional material suspension. In this case, a feed line must be provided instead of a return line 20. This can be connected to the supply line 2 which is present in any case, or else to a supply separate from it, the devices for the flow control 15, 16, 17, 18, 19 being designed as suitable, controllable pumps. If necessary, however, only a part of the branches can be used to remove pulp suspension, while the other branches can supply pulp suspension. The

Control elements can be designed so that the flow direction and the flow rate can be controlled.

FIG. 2 shows a variant in two vertical sections, in which the distribution box 1 is connected to a collecting container 20 via connecting lines 11-14. The height of the end of the connecting lines 11, 12, 13, 14, which goes into the collecting container 20, is adjustable, for example by sleeves 66 which can be displaced from the outside or by a telescopic design of the connecting lines which extends over at least part of the connecting lines . This creates a weir that is adjustable in height and thus makes the local pressure in the distributor individually adjustable.

FIG. 3 shows a modification in which the connecting lines 11, 12, 13 are designed as slots with adjustable surface elements 60, 61 and 62 behind them, which serve as overflow weirs. By adjusting these surface elements, the effective weir height can be changed locally, so that here too a local pressure correction takes place in the distribution box 1. Another possibility for influencing the pressure conditions is shown in FIG. 4, in which the material is drawn off not via individual branch lines arranged over the machine width, but via an outlet slot 64 between the distribution box 1 and the collecting container 20, the outlet slot 64 via the entire machine width goes. A vertical overflow weir 63 extending over the entire width is also provided in the collecting container 20, the height of which can be adjusted locally from the outside over the width. As a result, the hydrostatic pressure in the distributor or in the nozzle can be changed simply by changing the weir height of the outlet slot 64. Instead of a vertical weir, a displaceable screen 65 can also be provided, by means of which the outlet slot 64 can be individually adjusted over the width.

Instead of attaching the branch lines or connecting slots to the side of the distribution box 1, these can also be provided at other points of the headbox device, for example on the diffuser block 5, or in the nozzle chamber 29 immediately after the diffuser block or just before the outlet gap 8 or in between.

FIG. 5 shows an analog headbox device in vertical section, in which again a distributor 1, a diffuser 5 with a row of parallel channels 6, and a nozzle chamber 29 with an outlet gap 8 are provided. The stock suspension flows from the nozzle space 29 onto the sieve guided over a breast roller 31 32 a paper machine. The front part 33 of the upper delimitation lip 7 of the nozzle space 29 can be individually adjusted over the width by means of a joint 34 and by means of adjusting device 35 distributed over the width of the outlet gap 8. In many cases, the outlet gap is delimited at the top by a diaphragm which is mounted on the upper lip, but is freely movable to a certain extent with respect to the upper lip. The gap width can then be changed using the adjustment devices attached to the cover. As a result, the amount of suspension emerging from the gap can be controlled locally independently over the width. The supply or discharge of fiber suspension is again carried out via branch lines 11 on the distributor 1 and also or optionally via branch lines 51 on the nozzle chamber 29, valves or pumps 36 or the designs shown in FIGS. 2-4 being provided for quantity regulation.

As shown in FIG. 6, further possibilities are that the branch lines are provided either selectively or in combination on the distributor 1, on the diffuser block 5 or on the nozzle chamber 29. Changes in the pressure curve can be compensated for as close as possible to the point of origin. In the example shown, the possibility is provided to provide branch lines 37 on the upper side of the distributor 1 or at another location. Instead, the branch lines can also be led directly out of the diffuser block 5. In the example shown, lines 39 are, for example, direct in the first diffuser stage, lines 40 in the second diffuser stage after the paragraph to the first stage, or lines 41 into the third diffuser stage immediately after the paragraph to the second stage. However, feed lines can also be provided in the nozzle space 29 itself, for example lines 42 in the beginning of the nozzle space, immediately behind the outlet openings 43 from the diffuser channels or lines 44 which are movable in the vicinity of the outlet gap 8 of the nozzle space 29 Part 33 of the upper lip opens out. As already mentioned, these lines can, depending on requirements, lead to

For the purpose of pressure regulation or the change in consistency of water or white water with a lower consistency or suspension of material are added or removed.

A further pressure regulation possibility in the distributor 1 can be created by changing the distributor ratio, e.g. through a movably formed rear wall 45 of the distributor. The mobility can be achieved in that the rear wall 45 can be adjusted either manually or by means of a control device over the width of the distribution box, as a result of which the pressure profile in the distributor can be adjusted, or in that the rear wall 45 is designed as a flexible and deformable membrane, which adjusts itself automatically, for example with the aid of a pressure cushion on the back, so that the same pressure prevails over the entire width of the distribution box.

In combination with other adjustment and control options or alone, you can achieve the same

Flow velocities and the same pressures across the width of the nozzle area change the nozzle geo- be necessary. For this purpose, adjustment options 52 are necessary, which are to be provided immediately after the guide device, in front of the outlet gap or also in between, wherein the adjusting devices can also be attached at two or more positions in the machine direction.

Further control options consist in providing adjustable orifices 46 in front of the inlet openings 38 of the diffuser channels 6 or corresponding adjustable orifices 47 in front of the outlet openings 43 of the diffuser channels. These can consist of displaceable elements, iris diaphragms, inflatable bodies or other elements. Suspension or water can also be supplied via lines 50 directly at the inlet 38 of the channels, or the channels can be narrowed by controllable pressure bodies 27.

The increased pressure loss at the edges, e.g. due to friction on the side walls 9, it can be compensated that the pressure loss of the guide device changes in the edge zones, e.g. is reduced, which is achieved by changing the passage cross section per unit width.

FIG. 7 shows an example of a diffuser block 5 with a plurality of rows of step diffusers arranged one above the other. To reduce the pressure loss of the diffusers, the cross section of the diffusers in the edge zone 48 on the side wall 9 is larger than in the adjoining central zone 49, so that the pressure loss in the material Suspension in the edge zone is somewhat smaller than in the middle and thus the increased pressure losses in the edge zone can be compensated.

In the case of the diffuser block 5 shown in FIG. 8, the individual rows of step diffusers are offset from one another, which means that a lower nozzle pressure arises in the edge zone 48 due to the diffusers missing relative to the center 49. A larger material flow per unit of width is achieved in the edge zone by making additional bores or by reducing the pressure loss of the individual element of the guide device in the edge area, so that a pressure correction is also possible here. In this way, fundamental deficiencies in the design of the distributor or at another location on the paper machine can also be compensated for by changing and adapting the hole diameter or pressure loss across the web width.

Modifications and appropriate further developments are possible and are within the scope of the inventive concept. Thus, as shown in FIG. 9, the branch lines 11 connected to the collecting line 20 can advantageously also be connected at the highest point of the distributor 1, which ensures that any air excretions can be safely removed. Immediately next to it, the connection for the diffuser 5 can be provided, so that the pressure control takes place in the immediate vicinity of the inlet of the diffuser. The collecting line can also be guided directly along the distributor 1, so that the branches 11 are formed by openings which connect the distributor 1 and the collecting line 20.

FIG. 10 shows an example in which the diffuser is designed as a guide device which is known per se and which connects a distributor 1 with the lips 7 and an outlet gap 8 and has two pipe systems connected in series and separated by a space 55 bypassing the suspension 53 and 54. This intermediate space 55 is connected through branch openings 56 with an independently controllable or regulable cross section to an overflow line 57, which at the same time shows a damping effect.

FIG. 11 shows an analogous example in which the controllability is achieved by sliders 58 which change the cross section of the branch openings. The openings 59 can optionally also be brought forward to the beginning of the nozzle chamber 29.

Claims

Claims
1. Headbox device for a paper machine with a distribution box (1) for distributing a supplied material suspension over the web width of the paper machine, a guide device (5) having a plurality of holes or channels (6) for the material suspension, and a subsequent nozzle space (29) with an outlet gap (8) for distributing the material suspension with a specific weight per unit area over the web width of the paper machine, the mass distribution over the web width of the paper machine optionally by locally changing the width (h) of the outlet gap (8) and / or can be changed by changing the material density locally, characterized in that, even if the mass distribution changes, the flow of the material suspension in the headbox can be adjusted such that, seen across the web width of the paper machine, the horizontal component of the flow direction of the material suspension at the outlet gap (8) everywhere l is parallel in the machine direction and the flow velocity in the outlet gap (8), via the machine seen broad, corresponds to a predetermined profile.
2. Device according to claim 1, characterized in that in the area of the entry into the nozzle chamber (29) and in the area of the outlet gap (8) there are the same speeds and pressures across the machine width.
3. Device according to claim 1, characterized in that at individual points in the nozzle chamber (29) seen in the machine direction, or over the entire length of the nozzle chamber (29), the same speeds and pressures are present across the machine width.
4. Device according to one of claims 1-3, characterized in that the flow of the stock suspension either by changing the pressure profile in the distributor (1), by changing the geometric dimensions of the distributor (1), the guide device (5) or Nozzle chamber (29), or by supplying or removing material suspension, or supplying water in the distributor (1), in the guide device (5), or in the nozzle chamber (29), individually or in combination with one another.
5. The device according to claim 4, characterized gekenn¬ characterized in that distributed over the width of the headbox, controllable branches (11 - 14, 37, 39 - 42, 44, 56, 58, 59) for controlling the Pressure in the stock suspension and / or the stock suspension amount are provided.
6. The device according to claim 5, characterized gekenn¬ characterized in that the branches (11 - 14, 37) are connected to the distribution box (1).
7. The device according to claim 6, characterized gekenn¬ characterized in that the branches (11) at the highest point of the distribution box (1) are connected.
8. The device according to claim 6, characterized in that the branches (11) in the immediate vicinity of the inlet openings of the guide device (5) are connected to the distribution box (1).
9. Device according to one of claims 6-8, characterized in that the branches (11
- 14) protrude with its end facing away from the distribution box (1) into a collecting container (20), the length of its part projecting into the collecting container (20) being variable.
10. Device according to one of claims 6-8, characterized in that the branches (11
- 14, 64) are formed as at least one opening and that an overflow weir (60, 61, 62) which is adjustable in height is provided at the openings in the collecting container (20).
11. The device according to any one of claims 6-8, characterized in that the branches consist of a slot (64) extending in the longitudinal direction between the distribution box (1) and a collecting container (20), the width of which can be adjusted locally.
12. The apparatus according to claim 5, characterized gekenn¬ characterized in that the branches (39 - 41, 56, 58) are connected to the guide device (5, 55).
13. The apparatus according to claim 12, characterized in that the branches (39) are connected to the first stage of a channel of the guide device (5) designed as a stage diffuser.
14. The apparatus according to claim 12, characterized in that the branches (40, 41) are connected to the second or a subsequent stage of a channel of the guide device (5) designed as a stage diffuser immediately after one stage.
15. The apparatus according to claim 5, characterized gekenn¬ characterized in that the branches (59) to the nozzle chamber (29) are connected.
16. The device according to one of claims 4 - 15, characterized in that the branches control devices (15 - 18, 36) for the have flow or cross-sectional control of the feed or discharge of stock suspension and / or water.
17. The apparatus as claimed in claim 16, characterized in that measuring devices (21-25) distributed over the width of the headbox are provided for measuring the hydrostatic pressure of the stock suspension.
18. The apparatus according to claim 17, characterized gekenn¬ characterized in that a control device (26) is provided, which is controlled by the measuring devices (21 - 25) and regulates the flow and optionally the flow direction.
19. The device according to claim 18, characterized in that the control device (26) is set up to regulate the pressure across the width of the headbox to a predetermined pressure profile.
20. The apparatus according to claim 19, characterized in that measuring devices for properties of the paper web, in particular the surface weight or the fiber orientation, are provided over the width of the paper web produced, which devices are connected to the control device (26) and this has a specific pressure profile specify the width of the headbox.
21. Device according to one of claims 1-20, characterized in that means (27) for changing the cross-section of the channels (6) are provided.
22. Device according to one of claims 1-20, characterized in that means (50) for supplying water to the entrances (38) of the channels (6) are provided.
23. Device according to one of claims 1 - 22, characterized in that in front of the inlet openings (38) of the guide device (5) or after its outlet openings (43) adjustable elements (46, 47) for flow control by the guide device ( 5) are provided.
24. .Device according to one of claims 1 - 23, characterized in that the cross section of the channels (6) of the guide device (5) is different over the web width.
25. Device according to one of claims 1-23, characterized in that the channels (6) of the guide device (5) in the edge zones (48) of the headbox have a smaller pressure loss than in the central zone (49).
26. The device according to claim 25, characterized gekenn¬ characterized in that the guide device (5) in the edge zone has the same number of channels (6) per unit width, the cross sections of the channels (6) in the edge zone (48) are larger than in the middle zone (49).
27. The device according to claim 25, characterized in that additional bores (50) are provided in the guide device (5) in the edge zone (48).
28. Device according to one of claims 1-27, characterized in that the geometry of the distribution boxes (1) and / or the nozzle chamber (29) over the width of the headbox locally individually by means of an adjusting device (45) can be changed.
29. A method for operating the device according to any one of claims 1 - 28, characterized in that when changing the mass distribution of the stock suspension 'over the web width of the Papier¬ machine by local variation of the width of the outlet gap and / or simultaneously by local variation of the fabric density, the Flow of the stock suspension in the headbox is adjusted so that seen across the web width of the paper machine, the horizontal component of the flow direction of the stock suspension at the outlet gap is parallel everywhere in the machine direction and the flow velocity in the outlet gap, seen across the machine width, is the same.
30. The method according to claim 29, characterized in that the setting of Flow optionally by changing the pressure profile in the distribution box, by changing the geometry of the distribution box, the guide device, or the nozzle space or by supplying or removing material suspension or supplying water in the distribution box, in the guide device or in the nozzle chamber, individually or in combination with one another.
31. The method according to claim 30, characterized gekenn¬ characterized in that the change in the pressure profile in the distribution box is carried out with a control device (26) by pressure measuring devices
(21 - 25) is controlled.
32. The method according to claim 31, characterized in that the control device (26) from sensors for properties of the paper web produced are supplied with control signals (28) which specify a specific pressure profile for the control device (26).
EP19850904806 1984-09-19 1985-09-16 Headbox system for a paper machine Expired - Lifetime EP0195807B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CH448984 1984-09-19
CH4489/84 1984-09-19
CH915/85 1985-02-28
CH91585 1985-02-28
PCT/EP1985/000473 WO1986001844A1 (en) 1984-09-19 1985-09-16 Headbox system for a paper machine, and process for its operation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT85904806T AT47438T (en) 1984-09-19 1985-09-16 Material drain device for a paper machine.

Publications (3)

Publication Number Publication Date
EP0195807A1 true EP0195807A1 (en) 1986-10-01
EP0195807B1 EP0195807B1 (en) 1989-10-18
EP0195807B2 EP0195807B2 (en) 1994-07-13

Family

ID=25686098

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19850904806 Expired - Lifetime EP0195807B2 (en) 1984-09-19 1985-09-16 Headbox system for a paper machine

Country Status (5)

Country Link
US (3) US4898643A (en)
EP (1) EP0195807B2 (en)
DE (1) DE3514554C3 (en)
FI (1) FI90359B (en)
WO (1) WO1986001844A1 (en)

Families Citing this family (85)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4687548A (en) * 1984-10-31 1987-08-18 Valmet Oy Method and apparatus for controlling distortion of fibre orientation in a paper web
FI73766C (en) * 1985-12-13 1987-11-09 Ahlstroem Oy INLOPPSLAODA FOER PAPPERSMASKIN. TRANSFERRED PAEIVAEMAEAERAE-FOERSKJUTET DATUM PL 14 ç 17.12.85.
CH671418A5 (en) * 1987-02-23 1989-08-31 Escher Wyss Gmbh
GB8711330D0 (en) * 1987-05-14 1987-06-17 Beloit Corp Headbox
DE3802298A1 (en) * 1987-06-09 1988-12-22 Peter G Mercer Method and device for improving the homogenity of fiber distribution in the machine manufacturing of a fibrous material
FI80090C (en) * 1987-12-23 1990-04-10 Ahlstroem Valmet Method and apparatus in the inlet box of a paper machine for stable insulation of its lip beam
FI79365C (en) * 1988-03-28 1989-12-11 Ahlstroem Valmet AKTIVDAEMPARE Foer DAEMPNING AV TRYCKVIBRATIONER I INLOPPSLAODAN OCH MASSAROERSYSTEMET I PAPPERS- OCH KARTONGMASKINER.
AT392989B (en) * 1988-05-17 1991-07-25 Voith Ag J M Fabric drain for paper machines
DE3836062A1 (en) * 1988-10-22 1990-04-26 Voith Gmbh J M Fabric outlet for a machine for the production of fiberglass sheets, in particular of paper sheets
FI81848C (en) * 1989-07-17 1990-12-10 Valmet Paper Machinery Inc Method for controlling and on-line measurement of the fiber orientation of a web produced on a paper machine
FI896202A (en) * 1989-12-22 1991-06-23 Ahlstroem Valmet Method och anordning vid inloppslaodan av en pappers-, kartong- eller torkmaskin.
JPH03249297A (en) * 1990-02-26 1991-11-07 Mitsubishi Heavy Ind Ltd Method for adjusting direction of flow in head box of paper-making machine
DE4019235A1 (en) * 1990-06-15 1991-12-19 Voith Gmbh J M Fabric drain
DE4019593C2 (en) * 1990-06-20 1994-01-20 Voith Gmbh J M Headbox for paper machines
US5707495A (en) * 1990-06-20 1998-01-13 J.M. Voith Gmbh Headbox for papermaking machine with more uniform flow
DE4025675C2 (en) * 1990-08-14 1994-10-20 Escher Wyss Gmbh Headbox
DE4108759C2 (en) * 1991-03-18 1997-07-31 Schultz Hans Joachim Dr Ing Connection between a multiple distributor and a headbox
US5196091A (en) * 1991-10-29 1993-03-23 Beloit Technologies, Inc. Headbox apparatus with stock dilution conduits for basis weight control
DE4213707A1 (en) * 1992-04-25 1993-10-28 Escher Wyss Gmbh Headbox device for a paper machine
JP3021219B2 (en) * 1992-10-29 2000-03-15 三菱重工業株式会社 End flow control device for paper machine head box
DE4237309A1 (en) * 1992-11-05 1993-04-08 Voith Gmbh J M
FI934697A (en) * 1992-11-05 1994-05-06 Voith Gmbh J M Inloppslaoda Foer en pappersmaskin med en modifierbar underlaepp
DE4237310C2 (en) * 1992-11-05 1994-07-07 Voith Gmbh J M Headbox with device for adjusting the fiber orientation
DE4239845C2 (en) * 1992-11-05 1998-12-03 Voith Gmbh J M Procedure for measuring the effect of adjustments on the headbox and for correcting the basis weight and fiber orientation cross profile
DE4237307C2 (en) * 1992-11-05 1994-08-18 Voith Gmbh J M Headbox of a machine forming a fibrous web
DE4241076C2 (en) * 1992-11-05 1995-04-06 Voith Gmbh J M Headbox of a paper machine with a variable lower lip
DE4239647C2 (en) * 1992-11-26 1994-11-03 Voith Gmbh J M Method and device for equalizing the basis weight cross-section by means of sieve circuit sectioning
DE4239644C2 (en) * 1992-11-26 1994-10-27 Voith Gmbh J M Headbox of a paper machine with shaft insert
FI103995B1 (en) * 1993-06-17 1999-10-29 Valmet Paper Machinery Inc Method and apparatus and adjustment arrangement in a paper machine for controlling the transverse profile of a paper web
DE4320243C2 (en) * 1993-06-18 1996-02-22 Voith Sulzer Papiermasch Gmbh Headbox for a paper machine
DE4321268C2 (en) * 1993-06-28 1996-08-14 Voith Gmbh J M Headbox and method for producing a multi-layer and multi-layer paper web
AT335100T (en) * 1993-07-01 2006-08-15 Metso Paper Inc Method and device for regulating a timing tray box
DE4323263C2 (en) * 1993-07-12 2001-11-29 Voith Paper Patent Gmbh Process for the sectional influencing of the stock density and the fiber orientation in a headbox of a paper machine and headbox for carrying out the process
DE4408713A1 (en) * 1994-03-15 1995-09-21 Escher Wyss Gmbh Method and device for guiding a material web
DE4409415C5 (en) * 1994-03-18 2005-02-17 Voith Sulzer Papiermaschinen Gmbh Metering device for a headbox of a paper machine
CA2121967C (en) * 1994-04-22 1996-05-21 Douglas Henry Offerhaus Method of reducing surface irregularities in paper machine headbox components
DE4417461C2 (en) * 1994-05-19 1998-12-03 Voith Sulzer Papiermasch Gmbh Central distributor
DE4422907C2 (en) * 1994-06-30 1997-03-06 Voith Gmbh J M Sectional feed of the headbox of a paper machine
US5510005A (en) * 1994-07-25 1996-04-23 Westvaco Corporation Venturi headbox for a papermaking machine
US5549793A (en) * 1994-08-02 1996-08-27 Abb Industrial Systems, Inc. Control of dilution lines in a dilution headbox of a paper making machine
DE4433445C1 (en) * 1994-09-20 1996-03-28 Voith Gmbh J M Headbox of a paper machine
DE9416731U1 (en) * 1994-10-18 1995-01-12 Escher Wyss Gmbh Headbox for a paper machine
DE4437181C2 (en) * 1994-10-18 1997-02-27 Voith Sulzer Papiermasch Gmbh Headbox for a paper machine
US5560807A (en) * 1995-03-29 1996-10-01 Beloit Technologies, Inc. Headbox additive injection system
US5626722A (en) * 1995-06-01 1997-05-06 Valmet Corporation Headbox of a paper/board machine
US5603806A (en) * 1995-06-01 1997-02-18 Valmet Corporation Method and apparatus for lateral alignment of the cross-direction quality profile of a web in a paper machine
EP0774540B1 (en) 1995-11-17 2002-02-27 Voith Paper Patent GmbH Method for controlling the breaking length in the transverse direction of a moving fibrous web
SE506322C2 (en) * 1996-03-08 1997-12-01 Valmet Karlstad Ab Device for feeding stock to a headbox of a paper
US5853545A (en) * 1996-03-08 1998-12-29 Valmet-Karlstad Ab Arrangement for feeding stock to a headbox in a papermaking machine
US5882482A (en) * 1996-06-10 1999-03-16 Beloit Technologies, Inc. Convergent flow headbox
US6235159B1 (en) 1996-06-10 2001-05-22 Beloit Technologies, Inc. Convergent flow headbox
FI98938C (en) * 1996-06-20 1997-09-10 Valmet Corp Apparatus for combining the dilution flow with the pulp flow from the paper / board divider
EP0824157B1 (en) * 1996-08-14 2001-12-05 Voith Paper Patent GmbH Headbox and process for the distribution of a fibrous suspension in the headbox of a paper making machine
DE19654390A1 (en) * 1996-12-27 1998-07-02 Basf Ag Process for making paper
FI115645B (en) * 1997-01-14 2005-06-15 Metso Paper Inc Paper machine inlet box with edge feeding arrangement
US5833808A (en) * 1997-01-21 1998-11-10 Beloit Technologies, Inc. Method of controlling curl employing inline headbox edge flow control valve
US20050045299A1 (en) * 1998-02-06 2005-03-03 Franz Petschauer Process and a device for the formation of fiberboard
US20020084051A1 (en) * 1998-02-06 2002-07-04 Andritz-Patenverwaltungs-Gesellschaft M.B.H. Process and a device for the formation of fiberboard
FI113284B (en) 1998-02-13 2004-03-31 Metso Paper Inc Inlet box for a paper machine / board machine with which the surface weight of the web can be adjusted
US6004431A (en) * 1998-02-24 1999-12-21 Beloit Technologies, Inc. Headbox with active local flow control
US6146500A (en) * 1998-06-19 2000-11-14 Kimberly-Clark Worldwide, Inc. Suction breast roll former and method, with flexible headbox roof
US6033527A (en) * 1998-07-06 2000-03-07 Beloit Technologies, Inc. Paper machine edge fiber alignment control by angled headbox sides
DE19835295A1 (en) * 1998-08-05 2000-02-10 Voith Sulzer Papiertech Patent Method for setting a uniform property profile of a paper web
US6117272A (en) * 1998-09-03 2000-09-12 Voith Sulzer Papiermaschinen Device and process for metering auxiliary materials into the flow box of a paper machine
DE19908898A1 (en) 1999-03-02 2000-09-07 Voith Sulzer Papiertech Patent Process for metering a fluid medium into a suspension stream of a headbox and headbox
US6294051B1 (en) 1999-04-13 2001-09-25 Kimberly-Clark Worldwide, Inc. Method for improving the edge strength of a fibrous mat
FI113672B (en) 1999-04-28 2004-05-31 Metso Paper Inc Method and apparatus for mixing a diluent with a stock flow in a paper machine or board machine
DE19923149A1 (en) * 1999-05-20 2000-11-23 Voith Sulzer Papiertech Patent Fine control system for the pressures at the stock inlet of a papermaking machine
DE19926809A1 (en) * 1999-06-13 2000-12-14 Voith Sulzer Papiertech Patent Turbulence generator at the stock inlet of a papermaking/cardboard prodn machine has a structured layout for the rows of turbulence tube channels with different opening intervals at the entry and outlet ends for space saving
US6270625B1 (en) * 1999-06-29 2001-08-07 The Mead Corporation Method for manufacturing colored stripped paper
WO2001029297A1 (en) * 1999-10-20 2001-04-26 Auckland Uniservices Limited A method of fibre separation
WO2001049929A1 (en) * 1999-12-30 2001-07-12 Metso Paper, Inc. Method and system for controlling headbox in a paper/board machine
GB2367564B (en) 2000-10-04 2004-02-18 Sandusky Walmsley Ltd Method of and apparatus for distribution of paper stock in paper or board making machinery
FI20002680A0 (en) * 2000-12-07 2000-12-07 Valmet Corp A method and apparatus for adjusting the dry matter profile of a web on a wire section of a paper machine / board machine
DE10208610B4 (en) * 2002-02-27 2014-03-06 Voith Patent Gmbh Method for distributing a pulp suspension in the headbox of a paper or board machine and headbox
FI113197B (en) * 2002-09-20 2004-03-15 Metso Paper Inc The applicator
DE10341448A1 (en) * 2003-09-09 2005-03-31 Voith Paper Patent Gmbh Papermaking assembly directs fibre suspension into closing gap between two sieve belts under a water jet baffle plate
SE0502140L (en) * 2005-09-28 2006-11-14 Kvaerner Pulping Tech Apparatus for mixing steam to a flow of cellulose pulp
AU2007211272B2 (en) 2006-02-01 2010-05-20 Astenjohnson, Inc. Headbox and stock delivery system for a papermaking machine
US8877011B2 (en) 2011-05-11 2014-11-04 Hollingsworth & Vose Company Systems and methods for making fiber webs
WO2013016509A1 (en) 2011-07-27 2013-01-31 Hollingsworth & Vose Company Systems and methods for making fiber webs
EP2736712A4 (en) 2011-07-27 2015-03-11 Hollingsworth & Vose Co Systems and methods for making fiber webs
US8871059B2 (en) * 2012-02-16 2014-10-28 International Paper Company Methods and apparatus for forming fluff pulp sheets
CN104120616B (en) * 2014-07-25 2016-05-18 陕西科技大学 The fine-tuning quadrate centrum main pipe of exempting to reflux
FI12114U1 (en) * 2018-05-25 2018-08-15 Valmet Technologies Oy Edge feeding device for arranging additional feeding flow to a headbox turbulence generator of a fiber web machine

Family Cites Families (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2688276A (en) * 1951-05-11 1954-09-07 Marathon Corp Head box for paper machines
US2956623A (en) * 1957-04-01 1960-10-18 Ikavalko Erkki Process and apparatus for delivering paper stock to a wire mesh pulley belt
US2904461A (en) * 1957-08-23 1959-09-15 Beloit Iron Works Method and apparatus for controlling flow of stock through a slice jet
US2965623A (en) * 1957-11-08 1960-12-20 Borden Co Polymerization of vinyl esters
DE1165397B (en) * 1958-01-23 1964-03-12 Rice Barton Corp Headbox for paper machines
BE658601A (en) * 1964-01-23
US3434923A (en) * 1965-08-04 1969-03-25 Beloit Corp Headbox of a papermaking machine
US3547775A (en) * 1966-04-29 1970-12-15 Industrial Nucleonics Corp Means and method for modulating fiber stock flow in papermaking headbox in response to paper sheet product parameters
FR1519450A (en) * 1967-04-19 1968-03-29 Industrial Nucleonics Corp Method and equipment for the production of sheet products, in particular paper and plastic
US3556935A (en) * 1968-04-03 1971-01-19 Procter & Gamble Papermaking headbox with adjustable hydraulic nozzle and slice
GB1216114A (en) * 1968-07-04 1970-12-16 St Annes Board Mill Co Ltd Flowbox system
US3575800A (en) * 1968-11-13 1971-04-20 Beloit Corp Multiple gallonage header for paper machine headbox
US3573160A (en) * 1969-01-29 1971-03-30 Kasimir Lopas Tapered manifold stock distribution system for a papermaking machine with movable wall therein
DE1941424C3 (en) * 1969-08-14 1980-07-10 Escher Wyss Gmbh, 7980 Ravensburg
DE7034695U (en) * 1970-09-18 1971-12-23 Voith Gmbh J M Headbox channels with a variety of outlet nozzle upstream.
DE2151906A1 (en) * 1971-10-19 1973-04-26 Bellmer Geb Kg Maschf Pulp feed system - for paper making machinery with adjustable window in the high pressure transition region
US3791918A (en) * 1972-03-08 1974-02-12 Valmet Oy Headbox of a paper making machine having multiple, vertically inclined vanes
ZA7305253B (en) * 1972-10-12 1974-07-31 Crown Zellerbach Corp Apparatus and method for delivering a fiber slurry
US3960654A (en) * 1974-08-19 1976-06-01 Westvaco Corporation Shear pump headbox
FI50650C (en) * 1975-02-25 1976-05-10 Valmet Oy hydraulic headbox of the paper machine.
CH608049A5 (en) * 1976-01-23 1978-12-15 Escher Wyss Gmbh
CH608532A5 (en) * 1976-01-27 1979-01-15 Escher Wyss Gmbh
CH608255A5 (en) * 1976-05-11 1978-12-29 Escher Wyss Gmbh
US4285767A (en) * 1978-03-13 1981-08-25 Beloit Corporation Headbox having adjustable flow passages
FR2429867B1 (en) * 1978-06-30 1982-04-02 Centre Tech Ind Papier
DE2912152A1 (en) * 1979-03-28 1980-10-09 Fr Schiettinger Niederlassung Regulation of superficial weight transverse profile of recycled paper - by diluting water flow determined by humidity meter
ATA755479A (en) * 1979-11-29 1981-08-15 Stroemungsmasch Anst Fabric feed for screen presses
AT363776B (en) * 1980-01-31 1981-08-25 Stroemungsmasch Anst Fabric feed for screen presses
AT377026B (en) * 1980-12-19 1985-01-25 Escher Wyss Gmbh Fabric drive for a paper machine
US4414062A (en) * 1981-11-18 1983-11-08 Valmet Oy Headbox of a paper machine
DE3348218C2 (en) * 1983-06-09 1990-05-10 Sulzer-Escher Wyss Gmbh, 7980 Ravensburg, De
US4687548A (en) * 1984-10-31 1987-08-18 Valmet Oy Method and apparatus for controlling distortion of fibre orientation in a paper web

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8601844A1 *

Also Published As

Publication number Publication date
US4898643A (en) 1990-02-06
DE3514554A1 (en) 1986-03-27
DE3514554C3 (en) 1998-01-08
FI861944D0 (en)
EP0195807B2 (en) 1994-07-13
WO1986001844A1 (en) 1986-03-27
US4897158A (en) 1990-01-30
DE3514554C2 (en) 1994-06-16
FI861944A0 (en) 1986-05-09
FI861944A (en) 1986-05-09
US4888094A (en) 1989-12-19
FI90359B (en) 1993-10-15
EP0195807B1 (en) 1989-10-18

Similar Documents

Publication Publication Date Title
FI62156C (en) Foerfarande och anordning foer formning av en flerskiktsmaeldstraole
US5196091A (en) Headbox apparatus with stock dilution conduits for basis weight control
JP3301623B2 (en) Headbox for paper machine
ES2221058T3 (en) Method and appliance for applying a material to a band.
AU2002326975B2 (en) Method and apparatus for applying a material to a web
US3598696A (en) Multiple stage hydraulic headbox
US5262010A (en) Dewatering device with adjustable force elements for the web-forming section of a papermaking machine
DE3729621C2 (en)
DE3619579C2 (en) Device for the simultaneous production of two continuous cigarette strands
KR0186065B1 (en) A headbox tube bank apparatus
US4687548A (en) Method and apparatus for controlling distortion of fibre orientation in a paper web
EP0819191B1 (en) Headbox additive injection system
US3843470A (en) Flexible trailing elements in a paper-making machine headbox having projections thereon extending into the slurry flow
FI60420B (en) Framework for ordering through the following ring av en bana
US4909904A (en) Headbox for a paper machine with dilution feed lines before a turbulence generator
US5507918A (en) Twin-wire former
CA1066934A (en) Headbox for a paper machine for the production of a two- or multi-ply fiber web
US5685909A (en) Device for producing paper webs coated on both sides
US6585860B2 (en) Method to control or regulate the basis weight of a paper or cardboard web
US5814191A (en) Arrangement and method for combining a dilution flow with a stock flow passed out of an inlet header in a paper/board machine
US9670618B2 (en) Method and apparatus for making slit-banded wrapper using moving orifices
JP3494305B2 (en) Method for homogenizing paper web composition
FI100671B (en) Method and apparatus for increasing the gloss and smoothness of a material web
US8236137B2 (en) Headbox for a machine for producing a fibrous web
FI86897B (en) Inloppslaoda.

Legal Events

Date Code Title Description
AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT DE GB IT SE

17P Request for examination filed

Effective date: 19860423

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BUBIK, ALFRED

Inventor name: DAHL, HANS

Inventor name: KURTZ, RUEDIGER

Inventor name: WEISSHUHN, ELMER

Inventor name: STOTZ, WOLF-GUNTER

Inventor name: HOLIK, HERBERT

Inventor name: SEIDER, WERNER

Inventor name: ZEMBROT, ANTON

17Q First examination report despatched

Effective date: 19871117

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE GB IT SE

ITF It: translation for a ep patent filed

Owner name: BARZANO E ZANARDO MILANO S.P.A.

REF Corresponds to:

Ref document number: 47438

Country of ref document: AT

Date of ref document: 19891115

Kind code of ref document: T

Format of ref document f/p: P

REF Corresponds to:

Ref document number: 3573813

Country of ref document: DE

Date of ref document: 19891123

Format of ref document f/p: P

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)
26 Opposition filed

Opponent name: VALMET PAPER MACHINERY INC.

Effective date: 19900718

ITTA It: last paid annual fee
27A Patent maintained in amended form

Effective date: 19940713

AK Designated contracting states

Kind code of ref document: B2

Designated state(s): SE

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19940917

R27A Patent maintained in amended form (corrected)

Effective date: 19940713

EUG Se: european patent has lapsed

Ref document number: 85904806.8

Effective date: 19941017

Format of ref document f/p: F

GBTA Gb: translation of amended ep patent filed (gb section 77(6)(b)/1977)

Effective date: 19950613

PGFP Annual fee paid to national office [announced from national office to epo]

Ref country code: SE

Payment date: 19950804

Year of fee payment: 11

PGFP Annual fee paid to national office [announced from national office to epo]

Ref country code: GB

Payment date: 19990817

Year of fee payment: 15

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000916

PGFP Annual fee paid to national office [announced from national office to epo]

Ref country code: AT

Payment date: 20000919

Year of fee payment: 16

PGFP Annual fee paid to national office [announced from national office to epo]

Ref country code: DE

Payment date: 20001006

Year of fee payment: 16

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20000916

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20010916

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20020501