EP2255035B1 - Caisse de tête pour une machine a papier ou a carton - Google Patents

Caisse de tête pour une machine a papier ou a carton Download PDF

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Publication number
EP2255035B1
EP2255035B1 EP09722945.4A EP09722945A EP2255035B1 EP 2255035 B1 EP2255035 B1 EP 2255035B1 EP 09722945 A EP09722945 A EP 09722945A EP 2255035 B1 EP2255035 B1 EP 2255035B1
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EP
European Patent Office
Prior art keywords
headbox
layer
additive
metering
paper
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EP09722945.4A
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German (de)
English (en)
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EP2255035A1 (fr
Inventor
Hans Loser
Markus Häußler
Thomas RÜHL
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP2255035A1 publication Critical patent/EP2255035A1/fr
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • D21F11/04—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type paper or board consisting on two or more layers

Definitions

  • the invention relates to a headbox for a paper or board machine according to the preamble of claim 1.
  • the invention relates to a paper or board machine with such a headbox.
  • Paper or cardboard is a flat material consisting of fibers predominantly of vegetable origin and of excipients. The production of this material takes place industrially mostly by means of a paper machine, such as a Fourdriniermaschine. In the wet end of the paper machine, the dewatering of water-dispersed fibers, mostly wood fibers.
  • a paper machine such as a Fourdriniermaschine.
  • the fabric is by means of a headbox on a sieve, which also as a double screen, for example, with a lower sieve and an upper sieve like in the WO 01/83882 A2 described, may be formed, applied.
  • the fabric applied to the screen belt is also referred to as a paper web or in short as a web.
  • the main component of the introduced into the headbox pulp suspension and thus the finished paper or cardboard are vegetable fiber raw materials, also called pulp, serve as their main source of wood, but increasingly also recyclable waste paper or man-made fibers.
  • the non-fibrous starting materials of papermaking or paperboard production are referred to as paper auxiliaries or simply as auxiliaries.
  • the excipients include in particular substances such as fillers or any kind of chemicals, it is also called paper chemicals.
  • retention agents are of importance, which contribute in particular to the retention of the fillers and fines in the paper web, that is to the binding of fillers and fines to the fibers.
  • the main task of a headbox on a paper machine is to locally, ie in width, short CD for "cross direction", the fiber and auxiliaries Vietnamese suspension, and temporally, ie in the direction of the paper machine, short MD for "Machine Direction", evenly distributed on the rotating screen belt. It is known to form multilayer webs by means of headboxes in which the dispensing head is divided into sections. During the dewatering process, a fibrous felt is formed from the pulp suspension during sheet formation, which is then compacted and dried in the dryer section of the paper machine.
  • Headboxes are known in different forms.
  • the headbox according to the DE 696 13 689 T2 an inlet header or manifold, which typically has a tapered configuration.
  • the inlet header and a stowage device the latter is also referred to as a nozzle of the headbox, can a large number of distribution pipes, which are regularly arranged in a kind of tubular battery, are located.
  • a shaper and a headbox for such a shaper are for example from the WO 02/063097 A2 known.
  • the headbox comprises at least one stock suspension feed, a multi-channel turbulence block, and / or a multichannel tubular generator, and a headbox nozzle whose suspension jet impinges on a free or exposed surface of a dewatering belt, with at least a portion of the channels and / or headbox nozzle associated with eddy forming means are to produce in the guided through the channels in question suspended partial streams or in the headbox vortex flows, and wherein the suspension jet is at least partially covered by a wall on its side facing away from the drainage tape side.
  • the DE 697 19 756 T2 describes a headbox having means for combining a dilution flow with the stock flow derived from the inlet head of the paper machine, wherein the dilution liquid, which is preferably dilution water, enters into connection with the stock flow preferably from the inlet head in conjunction with the head Tube manifold occurs, which is located after the inlet head.
  • the basis weight of the web across the wire width can be regulated by passage regulating valves which allow the desired dilution flow to be passed to various locations across the width of the headbox.
  • the EP-A-0 745 721 describes a pulp feed system for a multi-layer casserole and method in operation of a multi-layer casserole in which a pulp composition is fed into each inlet manifold of the multi-layer casserole made from the same virgin stock by adding the necessary chemicals and fillers to separate sections of the virgin stock.
  • a pulp composition is fed into each inlet manifold of the multi-layer casserole made from the same virgin stock by adding the necessary chemicals and fillers to separate sections of the virgin stock.
  • the substance delivery system of Multilayer headbox is passed at least one dilution water line.
  • a multi-layer casserole may be taken for a paper or board machine, where the multi-layer casserole has distribution valves for dilution water across the width.
  • the sub-streams enter a multi-layer headbox, conventionally inlet heads, a tube header connected to each inlet head, an intermediate chamber connected to the tube header, a turbulence generator and turbulence tubes, a bleed nozzle cone downstream of the turbulence generator, and wings forming the Separate layers in the outlet nozzle cone has.
  • the substance is conventionally admixed, in front of the headbox, with retention aids and flocculants, which, as is known, serve to control the drainage and to control the consistency of the pulp.
  • retention aids and flocculants which, as is known, serve to control the drainage and to control the consistency of the pulp.
  • flocculants serve to control the drainage and to control the consistency of the pulp.
  • they fulfill the task of effecting the linking of fibers and fillers by transshipment or bridging and to influence the retention and the drainage behavior favorably in terms of product quality.
  • used as retention agents are high molecular weight compounds such as polyamines, polyamidoamines, polyacrylamides, polyethyleneimines, cationic starch and guar derivatives.
  • the drainage accelerators used are polyamines and polyethylenimines.
  • the retention agent is usually added before and / or after the classifier, but before the headbox, in any case before or at the latest in the distributor.
  • Classifiers or sorters also called screens in paper language, can be designed, for example, as vertical classifiers or as machine screens. They are known to be used to clean the pulp suspensions before they are passed on to the headbox.
  • the DE 696 13 689 T2 recommends, therefore, for a system for injecting additives into the headbox, to inject components for modifying the stock in the direction of the thickness of the paper web in a controlled manner, in particular to introduce plasticizers at a selected level in the direction of thickness into the formed paper web and over a large number of Discharge feed lines into the intake manifold of a headbox.
  • Plasticizers are known to have the task, the To improve the suppleness, creasability, stretchability, absorbency and satinability of paper as well as to prevent dusting. Substances such as paraffins, quaternary ammonium compounds, polyethylene glycols or polyalcohols are used.
  • Dissolve the flake structure can be loud DE 102 55 842 A1 by creating sufficient turbulence in the flow.
  • An advantageous method for fluidizing the fiber suspension consists in the generation of turbulence in a step-shaped extension part of the flow channel of the fiber suspension.
  • the intensity of the shear field generated in the rotationally symmetric extension of the flow channel is sufficient to provide optimum conditions for mixing the chemicals, but the shear stresses remain considerably less than, for example, in the shear field generated by pump or sorter blades.
  • the optimal method of mixing chemicals under the entire volume of the fiber suspension is to introduce the various components into the tube extension so that they are directed to the interface of the returning vortex forming behind the extension and thus into a sufficiently intense, but the Polymer Molecules Chains advised unbreaked shear field.
  • the dosage of chemicals can be either at one single or at several consecutive tube expansion stages.
  • a method and method of making a multilayer fibrous web is described. It is a supply of at least two different pulp suspensions comprises by a headbox.
  • the headbox separates by means of partitions the fiber streams from each other and leads them to a sheet forming device. Furthermore, the headbox forms a water layer with a transversally uniform flow at an outlet at the end of a lamella.
  • the water layer is shaped such that it forms a continuation or extension of the lamella, whereby a mixing of the flow layers of the pulp suspensions is prevented.
  • the sipe is freely movable in a substantially vertical direction to allow pressure equalization between the layers of pulp suspensions which are separated by the sipe, thereby reducing wake vortex flow effects downstream of the end edge of the sipes.
  • a headbox in particular multi-layer casserole, a paper machine out.
  • This comprises a nozzle whose interior is at least partially subdivided by at least one partition wall or lamella.
  • the at least one excipient is designed as a multicomponent system, wherein the metered addition of a Inlet (92) into a respective second supply means (16) distributed to an outlet (52) of the nozzle chamber (28) and thus takes place the metering in a location at the downstream no major pressure drop and / or no major turbulence in terms of Effect preservation of the excipient in the second layer (8) occurs or occur, and that the excipient is a paper chemical, in particular a retention agent.
  • the z direction refers to the vertical direction in accordance with the language usage of the field.
  • the machine direction, MD for "machine direction” is the direction in which the paper web is transported, that is, the direction in which the screen belt moves on its side facing the paper web.
  • the MD is also the direction in which the headbox causes the fabric, together with the added auxiliaries, to run onto the sieve belt.
  • the transverse direction, CD for "Cross Direction” is the direction that is normal for both the MD and the z-direction.
  • the CD is the direction in which the width of the screen belt extends while the MD is the direction in which the length of the screen belt extends.
  • the headbox is a multi-layer headbox with at least one metering device for at least one adjuvant, in particular retention agent.
  • a headbox allows in a paper or board machine, the addition of at least one excipient in at least one flowing through the headbox Siebwasserstrom für.
  • multi-layer drums several layers are present. It is at least a first layer, which carries a pulp suspension and a second layer, which leads essentially white water present.
  • a plurality of white water layers and / or several fibrous material layers may also be composed of other flowing media.
  • a layer could also lead at least predominantly to fresh water.
  • the different material transporting flow layers are arranged alternately in the z-direction of the headbox.
  • the headbox further generically comprises a second supply means for supplying substantially white water comprising the excipient. Furthermore, the headbox at least a first feeding the pulp suspension supplying means. First and second supply means are in turn connected to distribution pipes.
  • the headbox has a nozzle chamber tapering in the machine direction with a sieve-side outlet. Furthermore, a guide device is provided, to which the nozzle chamber connects. In the guide device Separierffen, such as a partition exist.
  • the separating means serves to separate or separate individual flowing layers in the headbox, in particular in the guide device.
  • the separating means extends, at least in regions, towards the outlet of the nozzle chamber.
  • the headbox may also comprise movable louvers extending from the guide means into the nozzle chamber.
  • at least one turbulence generator is provided between the guide device and the nozzle chamber. The turbulence generator is provided only in the region of the flowing first layer, that is to say the layer guiding the pulp suspension.
  • the individual layers can still be separated by lamellae.
  • the headbox has at least one metering device.
  • the metering device feeds at least one flowing layer with the at least one adjuvant.
  • the feed of the layer with the excipient through the metering device takes place at at least one metering location.
  • the Zudosierort can also be in the guide device and even in the nozzle chamber.
  • an arrangement of the metering location in the machine direction is possible in the entire range from an inlet for a feed means to the outlet of the nozzle chamber. When this is referred to as a low pressure, this is to be seen against the background that seen in the machine direction in the headbox in the presence of a turbulence generator, a strong pressure drop occurs.
  • a low pressure is thus present, for example, if no turbulence generator is introduced in the flow path of the second layer. It depends on the application where metering points are the cheapest to choose.
  • a location should be chosen where no major pressure drop and / or greater turbulence in the second layer occur downstream, thereby causing fragmentation of the molecular chains of the excipient, in particular a retention agent, no longer or no longer can occur in an effect-reducing manner.
  • a most preferred location is as described above, the nozzle chamber, for example in the vicinity of the screen-side outlet.
  • the metering device allows the metering of an excipient at the most effective metering location, which amounts to the correct amount in terms of correct wet chemistry.
  • the effect of the excipient can be preserved, that is, it is avoided that the effect of the excipient, in particular a retention agent, is undesirably reduced by fragmentation of its molecules.
  • the metering device which allows the metered addition of the excipient, is already arranged in the distributor tube or in the second delivery means.
  • the second supply means is operated with white water, that is, with the aid of the second supply means, white water is passed into the nozzle chamber.
  • the white water can be known to act as a delamination agent.
  • it is loaded with the excipient as a transport layer.
  • the addition of the excipient takes place over the entire machine width of the paper or board machine.
  • tubes or pipe rows are currently being used as the second supply means. The individual tubes open into a distributor tube which feeds the individual feed means.
  • the first supply means according to the invention are used to supply pulp suspension in the head box. They are usually connected to a separate distribution pipe.
  • pipes or lines intended for the metered addition of auxiliaries, in particular the metering device can also advantageously be used.
  • the dimensioning, that is properties such as cross-section, diameter, wall thickness, material selection, outer and inner surface finish, etc., of a pipe can be adapted to the substances to be transported or designed for this.
  • the feed with excipient or with excipients can be made in the second feed means itself.
  • the metered addition can also take place in the distributor tube for the second feed means.
  • the distributor tube preferably extends in the transverse direction of the paper machine.
  • the metered addition of the at least one auxiliary substance can take place exclusively or in any combination, before, in or after the distributor tube.
  • a metered addition takes place shortly before entry into or in the nozzle chamber.
  • the amount of auxiliary consumed and the product quality can be positively influenced.
  • the dosing can be done discretely distributed. Conceivable and possible, however, is also a continuous metering along the described path. It is particularly advantageous if at least a first component of the excipient in the distributor tube, at least a second component of the excipient in the headbox, preferably in the nozzle chamber, can be added. Due to the different chemical modes of action of the different auxiliaries used in the production of paper or paperboard, in particular due to different reaction times, until a desired effect has been used in sufficient intensity, it is provided to form auxiliaries as multicomponent systems, wherein the addition of different Components for the aforementioned reasons can advantageously be done at different Zudosierorten.
  • the at least one metering location in particular for adaptation to a specific application, can be varied.
  • the change in the position of a Zudosierorts for example, by targeted training or, preferably dynamic, adjustment, preferably the length of the separating agent in the machine direction, take place.
  • the position of the metering location in the nozzle chamber in particular from outside the nozzle chamber, and without disturbing the flow in the nozzle chamber, can be varied.
  • a first amount of the at least one adjuvant can be metered into at least one first flowing layer and one from the first different second amount into at least one second flowing layer.
  • the flowing layers can preferably be guided separately from one another by the at least one separating means.
  • the required amount of excipient on the nature, such as dilution, thickness in the z-direction, pulp, etc., a flowing position dependent, this nature must be formed differently due to the desired asymmetry in different layers.
  • the ability to drive different amounts of excipients in different layers thus supports the variety of manufacturable paper and board products.
  • the separating agent can improve the effect of the auxiliaries added in different amounts.
  • the distribution of the metering locations along the machine width may, for example, be equidistant from that of the pulp suspension feeding first feed means and / or the white water supplying second feed means. However, the distribution may also be made smaller, that is, the number of metering locations along the machine width for an adjuvant per unit of machine width may be higher than the number of inlets for the pulp suspension.
  • the distribution density affects the paper quality, in particular the uniformity of the paper quality, such as the basis weight or the tear behavior or more generally the paper structure in the transverse direction. With a dense distribution of metering sites, a reduction in the variance of paper or board properties, such as basis weight, across machine width can be achieved.
  • the pressure loss and thus the magnitude of the shear forces in the nozzle chamber can be adapted to occur in the first supply means supplying the adjuvant. Due to the adaptability of the pressure loss and thus the shear forces can, depending on the application, an optimal compromise between desired turbulence and thus mixing, for example, the dilution water with the excipient or the Hilfsstoffbefr bodyen white water with a pulp suspension layer on the one hand and preservation or even enhancement of the effect of the excipient on the other hand achieved become.
  • the metering device is divided into at least a first and a second section.
  • a delivery means may have a sectional division. Due to the fractionally different amounts of an excipient, it is possible to produce different product qualities side by side on a paper or board machine.
  • the sectional subdivision can also be used for the most exact adaptation of the individual Sectors are used to desired profiles, for example in the case of a scheme for adapting an actual profile of a section to a predetermined nominal profile of the section.
  • sectional nominal profiles may also be identical to one another, which in the control case results in that disturbing variables occurring in the headbox sectionally, that are sectionally, that is in the affected sections, can be corrected, without other, without departing, sections of be affected by a control intervention.
  • the at least two sections of the metering device can be integrated into a control, in particular into a formation control, whereby the profiling of the auxiliary material charge can be regulated over the machine width by a different dosage of the auxiliary material, in particular of the retention agent.
  • the ability to be integrated into a control system offers the possibility of adapting or adjusting sectional or sectoral actual profiles to sectional or sectoral nominal profiles.
  • the headbox according to the invention is advantageously used in a paper or board machine or is incorporated in such. With such a paper machine or board machine, papers and paperboard can be produced of particularly high and customer-specific tailor-made quality.
  • a paper machine 4 has, as is known to those skilled in the art, a wet end 7 with a dewatering device 105. It could also be a board machine.
  • a substance 5 is applied to a wire 2 by means of a head box 1 according to the invention, which is designed here as a three-layer dilution hydrogen headbox.
  • the headbox 1 has a screen-side outlet 52 along the transverse direction 88 of a panel 13. After leaving the nozzle chamber 28 of the headbox 1, the sheet formation begins on the wire 2, that is seen in the machine direction 76 after the outlet 52 are Blatt Struktursorte 56.
  • the wet end 7 may instead of the illustrated and a wire 2 having Langsiebformers also a Doppelsiebformer, such as a hybrid or gap former.
  • the paper machine 4 also comprises further parts, such as a Press section and a dryer section, as well as a winding machine, which are not shown for clarity sake.
  • each dewatering element 106 and in front of the first dewatering element 106 in the machine direction 76 water weight sensors 107 for measuring the dewatering of the substance 5 are conventionally arranged.
  • the machine direction 76 is indicated by an arrow.
  • the wire 2 is deflected material upstream side by means of a breast roll 6 and driven.
  • the fabric web 13 rests on the upper side of the wire 2 and is continuously moved away from it in the machine direction 76 and thus from the headbox 1, wherein the fabric 5 is continuously dewatered via the dewatering elements 106.
  • the white water is collected, for example in a white water tank, and pumped back to the headbox 1 as dilution water, where it is available for the formation or dilution of a flowing layer 12, 64, 68 (white water pan and return pump system are not in the drawing for clarity shown).
  • a first embodiment of a headbox 1 according to the invention is shown.
  • the headbox 1 is designed as a multi-layer casserole.
  • the multi-layer headbox comprises a first layer 12 which carries a pulp suspension and a second layer 8 which carries water, in the present case white water.
  • the in Fig. 1 illustrated headbox 1 is formed as a multi-layer casserole with two outer layers 12, which carry a pulp suspension, and a second layer, a so-called.
  • Middle layer 64 which leads substantially white water 80 is formed.
  • Each layer of the multilayer headbox is fed with the pulp suspension or the white water with its own feed means.
  • the first layer 12 is fed to the pulp suspension via first feed means 20, in the present case first feed lines.
  • the first supply means 20 or supply lines, which lead the pulp suspension into the guide device 11 of the headbox 1, are fed by a common first distributor tube 84.
  • the second layer 8 which is essentially Water, preferably white water, leads, the white water is supplied via second supply means 16.
  • the second supply means are fed via a separate distribution pipe 24.
  • the additive or excipient, in particular the retention agent is already added in the distributor tube 24 via the metering device 40.
  • a turbulence generator 49 which is shown here only schematically.
  • the turbulence generator 49 is formed only over the width of the first layer 12 which guides the fibrous material, whereas no turbulence generator is provided in the region of the second layer 8, which essentially carries white water and the auxiliary substance, in particular the retention agent.
  • the turbulence is generated in that the outlet opening is smaller than the width of the guide channel 13 itself.
  • elongate turbulence generators with correspondingly shaped walls, for example projections on the walls. Since the turbulence on entry into the nozzle 28 is generated only in the first layer, but not in the second layer, breaking and thus destruction of the polymer chains of the excipient, in particular the retention agent is prevented. The aid comes after the turbulence generator 49 in the nozzle 28 in contact with the fibers of the pulp suspension and can act there
  • the second layer 8 loaded with the excipient is shown hatched for better distinctness from the first layer 12 comprising the pulp suspension.
  • the middle layer 64 of the three flowing layers is the second layer 8 comprising the excipient.
  • the nozzle chamber 28 of the headbox 1 has a screen-side outlet 52 and tapers in the machine direction 76.
  • separating means 36 which here separate the two pulp suspension layers 12 from the middle layer 64, are present within the guide device.
  • the separating means 36 are formed here as partitions. Thus is each individual layer within the guide device 11 associated with a separate channel, which is formed by partitions.
  • the second in Fig. 3 illustrated embodiment of the headbox 1 has three first layers, so-called pulp suspension layers 12, each extending between two second layers.
  • the second layers essentially lead to white water wherein in the region of the distributor tube 24 or the auxiliaries are metered. Since the second embodiment is similar to the first embodiment, are for the same components in Fig. 2 the same reference numbers as in Fig. 1 used.
  • the third in Fig. 4 illustrated embodiment of the headbox 1 has two second layers 8, which is arranged in each case between two relative to one of the second layers 8 outer fibrous suspension layers 12.
  • the guide device 11 is again formed with separating means 36.
  • the separating means 36 are again partitions, so that in the guide device 11 individual, the respective layers associated channels are formed.
  • a mixing of the layers in the guide device does not take place, but only where the separating ends, ie in the nozzle device.
  • the layers can not only be separated in the z-direction, that is to say in the vertical direction, but also a separation along the machine width, that is to say in the CD direction, but this is not shown here.
  • the partitions are extended into the area of the nozzle chamber 28 with movable blades 32 which extend to close to the outlet 52. The excipient is thus mixed with the pulp suspension only at the nozzle outlet.
  • the fins 32 are movable, for example, suspended at a fulcrum 33.
  • the channel formed by the lamella tapers in the direction of the nozzle opening.
  • Different slats can have both an equal length and different lengths. In this regard, for example, on Fig. 4 directed. If the slats vary in length formed, so in the machine direction, that is, in the MD direction for different z-locations a different location of the admixture of excipient, which is performed in the white water, are set. This makes it possible to specifically influence the sheet formation properties in the z direction.
  • Each of the layers that essentially guide the water, in particular the white water, may be charged with one or more of the abovementioned auxiliaries. It is also possible to transport different auxiliaries in different first layers.
  • a turbulence generator 49 is provided. As in the embodiment according to Fig. 1 the turbulence insert in the areas in which the pulp suspension is guided, openings which define the channel, whereas by the turbulence generator, a channel boundary in the region of the second layer leading to the white water does not occur.
  • the excipient is metered into the first layer by at least one metering device 40.
  • the metered addition via the metering device is always in the distribution pipe 24, that is, in front of the guide means 11 of the headbox.
  • the metering device 40 for the fourth embodiment which is a Dreilichtenstoffauflauf 1 with two first layers 12, which carry pulp suspension 72, and a second layer, which leads substantially white water in Fig. 4 shown, the metering in the region of the guide device 11th
  • the metered addition or charging takes place at at least one metering location 44 in the guide device.
  • the feeding of the white water 80 leading middle layer 64 with the excipient through the metering device 40 by means of metering valves 41, which are installed in Zudosier effet 42 takes place.
  • the feed takes place in the illustrated embodiment at four different Zudosierorten 44 along the machine direction 76.
  • the metering 44 are arranged in the region of the guide means 11 of the headbox 1 in the machine direction 76.
  • the metering location 44 is located at a location of low pressure 48 in the headbox 1. Such prevails in the entire by separating walls as separating means of the fiber suspension layers 12 in the guide device separately guided second layer 8, in which the excipient is metered.
  • the pressure here is so low, one could say, just just so high that a breakage of molecular chains of the excipient, which is preferably a retention agent, is avoided.
  • Fig. 4 are again provided in the nozzle chamber 28 fins 32.
  • the movable suspended slats 32 are formed differently long in the machine direction. In this way, the white water with the adjuvant is added to the different first layers 12 at different locations in the z direction in the nozzle chamber.
  • a further embodiment of the invention is shown. Again, the same components as in the embodiments according to FIGS. 1 to 4 marked with the same reference numerals.
  • the addition of the auxiliaries, in particular of the retention agent in the white water in the supply line 16 from the distribution pipe 24 to the guide means 11 of the headbox 1 is carried out, in turn, a blade 32 is provided in the nozzle means.
  • a fifth embodiment of the head box 1 according to the invention is shown.
  • the first, with white water operated, second feed means 16 which is connected to the distribution pipe 24, the metering device 40, which the metering of the excipient, preferably over the entire machine width 60 of the paper or board machine 4, in various over distributed the machine width, the white water distributed with auxiliary leading channels of the guide device.
  • the fifth embodiment has features such as partition walls 36, metering valves 41, metering lines 42, etc., which have already been described in the first four embodiments. It is therefore here in this regard only referred to these above statements.
  • the feeding of a supply means 16, 20 takes place, as in the FIGS. 2 to 5 is indicated, via at least one transversely extending manifold.
  • the metered addition of the at least one adjuvant can be carried out before, in or after the distributor tube 24, exclusively or in any desired combination.
  • the at least one adjuvant in particular a retention agent, is designed as a multicomponent system.
  • the addition of the excipient can take place at one or more locations from the distributor tube to the nozzle chamber 28.
  • At least one first component or a first adjuvant in the distributor tube 24 and a second component or a second adjuvant may be metered into the second supply line 16.
  • a headbox 1 is shown in an oblique view with distribution and feeding means and a cross section of the headbox 1.
  • the same components as in the preceding figures bear the same reference numerals.
  • a plurality of metering locations 44 for auxiliaries may be arranged along the machine width 60. Their distribution is here along the machine width 60 equidistant from that of the pulp suspension 72 supplying first feed means 20. However, it could also be smaller than this.
  • a sectional division of the second supply means 16, in particular feed lines for white water with an auxiliary over the machine width allows the different addition of auxiliaries across the machine width and thus the adjustability of the paper quality across the machine width.
  • each supply line 16 with its own Zudosier seen as in Fig. 6 equipped equipped.
  • the pressure loss and thus the magnitude of the shear forces in the nozzle chamber 28 can be adjusted, which in the adjuvant supplying second Feed means 16 occur.
  • This adaptation can be done for example by means of appropriate pump pressure settings.
  • the metering device 40 may be subdivided into at least a first and a second section 96, 100 to allow for profiling of the adjuvant feed over the machine width 60.
  • the allocation of two metering valves 41 and two metering lines 42 to a section 96, 100 is in Fig. 7 indicated by two curved brackets.
  • the seventh embodiment of the headbox 1, which in Fig. 8 Finally, demonstrates the application of the invention in a three-layer casserole with two outer pulp suspension layers 12 and an arranged between these adjuvant leading middle layer 64, in which the pulp suspension layers 12 have different layer thickness in the z-direction.
  • a headbox is specified for the first time, which allows a metered addition of auxiliaries, in particular retention agents, without these being destroyed and thus reduced in their effect.
  • auxiliaries in particular retention agents

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Claims (10)

  1. Caisse de tête (1) pour une machine à papier ou à carton (4) avec un premier moyen d'amenée (20) pour une suspension de matière fibreuse (5) dans un dispositif de guidage (11), qui est raccordé à une chambre de buse (28) hors de laquelle la suspension de matière fibreuse (5) sort par une fente, et avec un dispositif d'addition dosée (40) pour l'addition dosée d'au moins un adjuvant, dans laquelle la caisse de tête est une caisse de tête multicouche (1) avec au moins une première couche (12) et une deuxième couche (8), dans laquelle au moins la première couche (12) de la caisse de tête (1) comprend une suspension de matière fibreuse (5) et la deuxième couche (8) de la caisse de tête (1) contient essentiellement de l'eau blanche, dans laquelle l'eau blanche est amenée au dispositif de guidage (11) par un deuxième moyen d'amenée (16), dans laquelle la première et la deuxième couches (8, 12) sont guidées séparément au moins dans le dispositif de guidage (11), dans laquelle le dispositif d'addition dosée (40) est disposé et configuré de telle manière que l'adjuvant soit ajouté essentiellement dans la deuxième couche (8), caractérisée en ce qu'il est prévu un générateur de turbulence (49) uniquement dans la région de la première couche en écoulement (12) et aucun générateur de turbulence n'est installé dans le chemin d'écoulement de la deuxième couche (8) et ledit au moins un adjuvant est formé par un système à plusieurs composants, dans laquelle l'addition dosée au moyen du dispositif d'addition dosée (40) est effectuée de façon répartie depuis une entrée (92) dans un deuxième moyen d'amenée respectif (16) jusqu'à une sortie (52) de la chambre de buse (28), et de ce fait l'addition dosée est effectuée à un endroit en aval duquel il ne se produit pas de chute de pression importante et/ou pas de fortes turbulences au sens de la conservation de l'action de l'adjuvant dans la deuxième couche (8), et en ce que l'adjuvant est un produit chimique de papeterie, en particulier un agent de rétention.
  2. Caisse de tête (1) selon la revendication 1, caractérisée en ce que les deuxièmes moyens d'amenée (16) présentent un dispositif d'addition dosée (40), qui permet l'addition dosée de l'adjuvant, de préférence sur toute la largeur de machine (60) de la machine à papier ou à carton (4).
  3. Caisse de tête (1) selon la revendication 1 ou 2, caractérisée en ce que ledit au moins un adjuvant en tant que système à plusieurs composants comprend au moins un composant de l'adjuvant et un deuxième composant de l'adjuvant et le premier composant peut être ajouté dans le tube répartiteur (24) et le deuxième composant peut être ajouté dans le deuxième moyen d'amenée (16) ou dans le dispositif de guidage (11) ou de préférence dans la chambre de buse (28).
  4. Caisse de tête (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que le dispositif de guidage (11) comporte des moyens de séparation (36) dans le sens machine (76), qui forment des canaux pour le guidage de la première et de la deuxième couches (8).
  5. Caisse de tête (1) selon la revendication 4, caractérisée en ce que, en particulier pour la formation d'une structure de feuille asymétrique, une première quantité dudit au moins adjuvant peut être ajoutée dans au moins une première couche en écoulement (64) et une deuxième quantité indépendante de la première quantité peut être ajoutée dans au moins une deuxième couche en écoulement, dans laquelle les couches en écoulement (64) peuvent être guidées séparément l'une de l'autre dans le dispositif de guidage (11) au moyen dudit au moins un moyen de séparation (36).
  6. Caisse de tête (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que plusieurs endroits d'addition dosée (44) sont disposés le long de la largeur de machine (60), dans laquelle leur répartition le long de la largeur de machine (60) peut être équidistante à celle du premier moyen d'amenée (20) amenant une suspension de matière fibreuse (5) ou être inférieure à celle-ci.
  7. Caisse de tête (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que, pour le renforcement de l'action dudit au moins un adjuvant, en particulier d'un agent de rétention, la perte de pression et de ce fait la grandeur des forces de cisaillement, qui apparaissent dans le deuxième moyen d'amenée (16) amenant l'adjuvant, est adaptable dans la chambre de buse (28).
  8. Caisse de tête (1) selon l'une quelconque des revendications précédentes, caractérisée en ce que le dispositif d'addition dosée (40) est divisé en au moins une première et une deuxième sections (96, 100), afin de permettre un profilage de la charge d'adjuvant sur la largeur de machine (60).
  9. Caisse de tête (1) selon la revendication 8, caractérisée en ce que lesdites au moins deux sections (96, 100) du dispositif d'addition dosée (40) peuvent être intégrées dans une régulation, en particulier une régulation de formation, le profilage de la charge d'adjuvant pouvant ainsi être régulé par un dosage différent par section sur la largeur de machine (60) de l'adjuvant (8), en particulier de l'agent de rétention.
  10. Machine à papier ou à carton (4) avec une caisse de tête (1) selon l'une quelconque des revendications 1 à 9.
EP09722945.4A 2008-03-20 2009-03-16 Caisse de tête pour une machine a papier ou a carton Active EP2255035B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200810000778 DE102008000778A1 (de) 2008-03-20 2008-03-20 Stoffauflauf für eine Papier- oder Kartonmaschine
PCT/EP2009/053043 WO2009115479A1 (fr) 2008-03-20 2009-03-16 Sortie de matière pour une machine à papier ou à carton

Publications (2)

Publication Number Publication Date
EP2255035A1 EP2255035A1 (fr) 2010-12-01
EP2255035B1 true EP2255035B1 (fr) 2015-02-25

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EP (1) EP2255035B1 (fr)
JP (1) JP2011515595A (fr)
CN (1) CN102066660B (fr)
DE (1) DE102008000778A1 (fr)
WO (1) WO2009115479A1 (fr)

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CN103015267B (zh) * 2012-12-17 2016-03-02 金红叶纸业集团有限公司 造纸用柔软剂的使用方法
EP2784213B1 (fr) 2013-03-28 2016-05-18 Valmet Technologies, Inc. Caisse de tête pour une machine de production d'une bande de matière fibreuse
EP2784214B1 (fr) * 2013-03-28 2015-09-16 Valmet Technologies, Inc. Alimentation en eau pour caisse de tête multicouche
CN103628343B (zh) * 2013-11-01 2017-01-11 维达纸业（中国）有限公司 一种低定量的紧致细柔纸面巾和其生产方法
DE102016121039A1 (de) * 2016-11-04 2018-05-09 Voith Patent Gmbh Vorrichtung und Verfahren zur Herstellung einer Faserstoffbahn
CN108130797B (zh) * 2017-12-21 2020-04-03 浙江恒达新材料股份有限公司 一种低定量免涂蜡功能型食品包装纸的制备方法
FI3540119T3 (fi) * 2018-03-15 2023-09-21 Valmet Technologies Oy Kuiturainakone ja menetelmä monikerroksisen rainan muodostamiseksi
EP3540118B1 (fr) * 2018-03-15 2022-11-23 Valmet Technologies Oy Machine à bande fibreuse et procédé de formation d'une bande multicouche
EP3540117B1 (fr) 2018-03-15 2023-07-26 Valmet Technologies Oy Caisse de tête multicouche d'une machine de fabrication d'une bande de matière fibreuse et procédé de formation d'une bande de matière fibreuse dans une section de formation d'une machine de production d'une bande de matière fibreuse
MX2022011946A (es) * 2020-03-31 2022-10-21 Kimberly Clark Co Sustratos zonificados y/o estratificados y metodo y aparato para producir los mismos.
CN116770624B (zh) * 2023-06-14 2024-04-19 昆山浠辰包装科技有限公司 一种具有柔印效果基材表面平滑度的制备工艺

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Publication number Publication date
JP2011515595A (ja) 2011-05-19
CN102066660A (zh) 2011-05-18
CN102066660B (zh) 2012-08-08
WO2009115479A1 (fr) 2009-09-24
DE102008000778A1 (de) 2009-09-24
EP2255035A1 (fr) 2010-12-01

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