WO2009115479A1 - Sortie de matière pour une machine à papier ou à carton - Google Patents

Sortie de matière pour une machine à papier ou à carton Download PDF

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Publication number
WO2009115479A1
WO2009115479A1 PCT/EP2009/053043 EP2009053043W WO2009115479A1 WO 2009115479 A1 WO2009115479 A1 WO 2009115479A1 EP 2009053043 W EP2009053043 W EP 2009053043W WO 2009115479 A1 WO2009115479 A1 WO 2009115479A1
Authority
WO
WIPO (PCT)
Prior art keywords
headbox
layer
paper
excipient
metering
Prior art date
Application number
PCT/EP2009/053043
Other languages
German (de)
English (en)
Inventor
Hans Loser
Markus Häußler
Thomas RÜHL
Original Assignee
Voith Patent Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent Gmbh filed Critical Voith Patent Gmbh
Priority to CN2009801099577A priority Critical patent/CN102066660B/zh
Priority to JP2011500172A priority patent/JP2011515595A/ja
Priority to EP09722945.4A priority patent/EP2255035B1/fr
Publication of WO2009115479A1 publication Critical patent/WO2009115479A1/fr

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Classifications

    • 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 with at least one first supply means for pulp suspension in a guide device which is connected to a nozzle from which the pulp suspension exits through a gap and with a metering device for metering at least one excipient such as a filler or a chemical of any kind, especially a paper chemical, such as a retention aid.
  • the invention relates to a paper or board machine with such a headbox.
  • the invention relates to a method for dosing at least one excipient, such as a filler or a chemical of any kind, in particular a paper chemical, such as a retention agent, to at least one flowing layer of a paper or board machine with a headbox with a nozzle chamber with a sieve side outlet.
  • excipient such as a filler or a chemical of any kind, in particular a paper chemical, such as a retention agent
  • 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 Fourdrinier machine.
  • a paper machine such as a Fourdrinier machine.
  • the dewatering of water-dispersed fibers mostly wood fibers.
  • a Feststoffaufschwemmung or a pulp suspension often short accepts, pulp or simply fabric, as long as undiluted and stock.
  • the fabric is by means of a headbox on a sieve, which also as a double screen, for example, with a lower sieve and - -
  • a top wire as described in WO 01/83882 A2 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 feedstocks used in 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 spread the fibrous and excipient-containing suspension locally, that is, in width, short CD for "cross direction", and temporally, ie in the direction of the paper machine, short MD for "machine direction” to distribute the circulating 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 DE 696 13 689 T2 can have an inlet distributor head or distributor, which as a rule 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 former and a headbox for such a former are known, for example, from WO 02/063097 A2.
  • 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.
  • 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 coming from the Inlet head preferably in communication with the tube manifold, 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.
  • DE 696 12 584 T2 describes a material supply system for a multi-layer headbox and a method in operation of a multi-layer headbox in which a stock composition is fed into each inlet manifold of the multi-layer headbox made from the same virgin stock by the necessary chemicals and fillers have been added to separate sections of the fresh substance.
  • a stock composition is fed into each inlet manifold of the multi-layer headbox made from the same virgin stock by the necessary chemicals and fillers have been added to separate sections of the fresh substance.
  • Multilayer headbox is passed at least one dilution water line.
  • DE 697 15 900 T2 discloses a multilayer headbox for a paper or board machine, wherein the multi-layer headbox has distribution valves for dilution water over the width.
  • DE 699 20 426 T2 discloses a method for applying a layer from an admixture in the web former unit of a board machine, in which two partial flows are generated from an identical intermediate substance.
  • the admixtures are added at a point in front of the pump, at a point after the pump and / or at the point after the machine screen, to increase the fines content and the bond strength between the sides.
  • 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.
  • High molecular weight compounds such as polyamines, polyamidoamines, polyacrylamides, polyethyleneimines, cationic starch - -
  • the drainage accelerators used are polyamines and polyethylenimines.
  • Classifiers or sorters also called screens in the paper language, can be designed, for example, as a vertical sifter or as a machine screen. As is known, they serve to clean the pulp suspensions before they are passed on to the headbox.
  • DE 696 13 689 T2 therefore recommends, 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 discharge through a large number of feeders into the inlet manifold of a headbox.
  • Plasticizers are known to have the task, the - -
  • the flake structure can be dissolved by producing 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 create optimum conditions for the mixing in of the chemicals, but the shear stresses remain considerably lower 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 so into a sufficiently intense, but the Polymer Molecules Chains advised unbreaked shear field.
  • the dosage of chemicals can be either at one - -
  • Retention agents are added in the headbox so that they are destroyed by a strong pressure drop or a turbulence field with strong shear fields.
  • the effect in particular the high molecular weight or polymeric paper chemicals, for example, the retention agent, such as starch, is reduced or can be reduced.
  • WO 03/048452 describes a method and a paper machine using the method for forming a multilayer fiber web. 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 constitutes a continuation or expansion of the lamella, whereby a mixing of the flow layers of the pulp suspensions is prevented.
  • the vane is freely movable in a substantially vertical direction to allow pressure equalization between the layers of pulp suspensions which are separated by the vane, thereby reducing wake vortex flow effects downstream of the end edge of the fins.
  • DE 101 59 412 A1 discloses a headbox, in particular multi-layer headbox, of a paper machine. This comprises a nozzle whose interior is subdivided at least in regions by at least one partition wall or lamella. - -
  • a chemical of any kind in particular a retention agent, such as starch, but also water, such as fresh water, dilution water, such as white water, a filler, a fines or another common in papermaking Meant additive.
  • a retention agent such as starch
  • water such as fresh water, dilution water, such as white water, a filler, a fines or another common in papermaking Meant additive.
  • 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
  • Such a headbox allows for a paper or
  • Multi-layer drums contain several layers. According to the invention at least one first layer, which leads a pulp suspension and a second
  • the 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 adjoins. 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 area of the flowing first layer, that is to say the layer guiding the pulp suspension. Then, the additive can be metered into the white water of the second flowing layer with the aid of the metering device already in the region of the distributor tube or the delivery line, without the mode of action of the auxiliary substance, in particular of the retention agent, being reduced. In the region of the second layer, which leads predominantly white water and the auxiliary material, no turbulence generator is then preferably provided. This results in little pressure drop, - -
  • the addition of the auxiliary substance into the second flowing layer preferably takes place after the turbulence generator, for example in the region of the nozzle chamber.
  • 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 metering point may also be in the guide device and even in the nozzle chamber. In principle, 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.
  • a low pressure 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, for example, if no turbulence generator in the flow path of the second layer is introduced. 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, can no longer or no longer occur in an effect-reducing manner.
  • a very preferred location is 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 screen 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.
  • pipes or pipe rows are currently being used as second feeders.
  • 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, choice of material, outer and inner surface finish, etc., of a pipe can be adapted to the substances to be transported or designed for them.
  • 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 at least one adjuvant in particular a retention agent, can, as already indicated, advantageously be designed as a multicomponent system.
  • the metered addition can be made from an inlet into a respective second supply means distributed to the outlet of the nozzle chamber.
  • the metered addition can be made 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.
  • auxiliaries used in the paper and carton production, in particular due to different reaction times, until a desired effect has been used in sufficient intensity, it is often favorable to form auxiliaries as multicomponent systems, the addition being different - -
  • 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.
  • the product quality can be finely regulated in particularly narrow limits.
  • the adjustment or adjustability from outside allows the integration of the fine control of the addition of the excipient in a quality assurance system with particularly tight intervention limits.
  • 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 adjuvant depends on the nature, such as dilution, thickness in the z direction, type of pulp, etc., of a flowing layer, whereby this condition must be different for different layers due to the desired asymmetry.
  • the possibility of being able to drive different amounts of auxiliaries in the different layers thus supports the diversity of producible paper and board products.
  • the separating agent can improve the effect of the auxiliary substances 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 smaller, that is to say the number of metering locations along the machine width for an auxiliary can be higher than the number of inlets for the pulp suspension per unit of the machine width.
  • the distribution density has an effect on the paper quality, in particular on the uniformity of the paper quality, such as, for example, 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 adjuvant-laden white water with a pulp suspension layer on the one hand and preservation or even enhancement of the action of the excipient On the other hand be achieved.
  • the metering device is divided into at least a first and a second section. This allows profiling of the adjuvant feed over the machine width.
  • a delivery means may also have a sectoral subdivision. Due to the fractionally different amount doping 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 in the headbox can be compensated for in sections, that is to say in the affected section (s). Sections of a control intervention are affected.
  • 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 board can be produced of particularly high and customer-specific tailor-made quality.
  • the invention also includes a method for dosing at least one excipient, such as a filler or a chemical of any kind, in particular a
  • Paper chemical such as a retention agent
  • Nozzle chamber with a screen-side outlet with a screen-side outlet.
  • at least one metering location for at least one adjuvant is brought close to a sheet forming location of the headbox in the machine direction. It is particularly preferred if the at least one metering location in the headbox, preferably in the nozzle chamber, in particular at a location of low pressure, preferably in - -
  • the process according to the invention has the advantage that adjuvants can be metered in at locations at which they are needed at the earliest or at the latest with regard to wet chemistry, whereby in synergy with this embodiment and through this, that is the metering at the favorable location, an effective and efficient provision for protecting the substantial integrity of, in particular high molecular weight or long-chain, auxiliaries and thus their effect is taken.
  • Figure 1 is a schematic side view of the wet end of a paper or board machine according to the invention with a first embodiment of the head box according to the invention.
  • FIG. 2 shows a cross section in a plane spanned by the z-direction and the machine direction through a first embodiment of the head box according to the invention
  • FIG. 3 shows a cross section in a plane spanned by the z-direction and the machine direction through a second embodiment of the head box according to the invention
  • FIG. 4 shows a cross section in a plane spanned by the z-direction and the machine direction through a third embodiment of the head box according to the invention.
  • FIG. 5 shows a cross section in a plane spanned by the z-direction and the machine direction through a fourth embodiment of the head box according to the invention
  • FIG. 6 shows a cross section in a plane spanned by the z-direction and the machine direction through a fifth embodiment of the head box according to the invention
  • FIG. 7 shows a combined oblique view from above of the distribution and supply means and a cross section in a plane spanned by the z-direction and the machine direction through a sixth embodiment of the head box according to the invention.
  • Fig. 8 shows a cross section through a seventh embodiment of the head box according to the invention.
  • 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 cardboard 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 - -
  • 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 top of the wire 2 and is running from this in the machine direction 76 and thus from the headbox
  • 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 for the formation or dilution of a flowing
  • FIG. 2 shows a first embodiment of a headbox 1 according to the invention.
  • 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 headbox 1 illustrated in FIG. 1 is designed as a multi-layer headbox with two outer layers 12, which guide a pulp suspension, and a second layer, a so-called middle layer 64, which essentially leads white water 80.
  • 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.
  • Water preferably white water leads, the white water via second feed means 16 is supplied.
  • 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. According to the invention, 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 which is loaded with the excipient, is shown hatched for better distinguishability from the first layer 12, which comprises 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.
  • each individual layer within the guide device 11 associated with a separate channel, which is formed by partitions.
  • the second embodiment of the headbox 1 shown in FIG. 3 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 the auxiliary substance (s) are added in the region of the distributor tube 24. Since the second embodiment is similar to the first embodiment, the same reference numerals as in FIG. 1 are used for the same components in FIG.
  • the third embodiment of the headbox 1 illustrated in FIG. 4 has two second layers 8, which are each arranged between two fibrous suspension layers 12 located outside relative to one of the second layers 8.
  • 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 dividing walls are extended into the region of the nozzle chamber 28 with movable lamellae 32, which reach 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, reference is made, for example, to Fig. 4. If the slats vary in length - -
  • excipients are understood as meaning fillers, any type of chemicals, but in particular retention aids.
  • Functional chemicals which are also referred to as auxiliaries and are used in the paper industry:
  • Each of the layers which essentially guide the water, in particular the white water, may be provided 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 of 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 always takes place in the distributor tube 24, that is to say in front of the guide device 11 of the headbox.
  • the metering device 40 for the fourth embodiment which shows a three-layer headbox 1 with two first layers 12, which carry pulp suspension 72, and a second layer, which leads essentially white water, in FIG. 4, 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 feeding takes place in the illustrated embodiment at four different metering locations 44 along the machine direction 76.
  • the metering locations 44 are arranged in the region of the guide device 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.
  • fins 32 are again provided in the nozzle chamber.
  • the movable suspended slats 32 are of different lengths 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 Figures 1 to 4 are identified by the same reference numerals.
  • the addition of the auxiliaries, in particular of the retention agent into the white water in the supply line 16 from the distribution pipe 24 to the guide means 11 of the headbox 1. is again in the nozzle means a blade 32 is provided.
  • a fifth embodiment of the head box 1 according to the invention is shown.
  • the first second feed means 16, which is operated with white water and which is connected to the distributor tube 24, has the metering device 40, which permits the addition of the excipient, preferably over the entire machine width 60 of the paper or board machine 4 distributed over the machine width distributed, the white water with auxiliary leading channels of the guide device.
  • a separate distribution tube is provided for each of the first layers which guide the pulp suspension.
  • 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 feed means 16, 20 takes place, as indicated in FIGS. 2 to 5, via at least one distributor tube extending in the transverse direction. - -
  • 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, can be 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 additive feed sites 44 may be disposed along the machine width 60. Their distribution is here along the machine width 60 equidistant from that of the pulp suspension 72 supplying second feed means 20. However, they 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 is equipped with its own metering device as shown in FIG.
  • the pressure loss and thus the magnitude of the shear forces in the nozzle chamber 28 can be adapted, which in the adjuvant feeding 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 indicated in FIG. 7 by two curved clamps.
  • a headbox is specified for the first time, which allows a dosing of excipients, in particular retention agents, without this being destroyed and thus reduced in their effect.
  • This is achieved in that the excipient is not supplied directly into the pulp suspension, but in a white water layer, the white water layer is guided separately through the guide means of the headbox and mixing takes place only in the area of the nozzle device of the headbox.

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Abstract

L’invention concerne une sortie de matière (1 ) pour une machine à papier ou à carton (4) comprenant au moins un premier moyen d’acheminement (20) pour une suspension de matière fibreuse (5) dans un dispositif de guidage (11) qui est relié à une buse (28) de laquelle la suspension de matière fibreuse (5) sort par une fente, et comprenant un dispositif d’apport dosé (40) pour l’apport dosé d’au moins une matière auxiliaire, telle qu’une matière de remplissage ou un produit chimique quelconque, notamment un produit chimique pour papier tel qu’un agent de rétention. La sortie de matière (1) selon l’invention est caractérisée en ce qu'elle se présente sous la forme d'une sortie de matière multicouche (1) comprenant au moins une première (12) et une deuxième couche (8). Selon l’invention, au moins la première couche (12) de la sortie de matière (1) contient une suspension de matière fibreuse (5) et la deuxième couche (8) de la sortie de matière (1) contient pour l’essentiel de l’eau blanche et la première ainsi que la deuxième couche (8, 12) sont acheminées séparément au moins dans le dispositif de guidage (11) et le dispositif d’apport dosé (40) est disposé et configuré de telle sorte que la matière auxiliaire est pour l’essentiel acheminée à la deuxième couche (8), qui contient pour l’essentiel de l’eau blanche. Toujours selon l’invention, l’eau blanche est acheminée au dispositif de guidage (11) par le biais d’un deuxième moyen d’acheminement (16) et l’apport dosé s’effectue à un endroit en amont duquel il ne se produit pas de chute de pression importante et/ou de turbulences importantes dans la deuxième couche (8).
PCT/EP2009/053043 2008-03-20 2009-03-16 Sortie de matière pour une machine à papier ou à carton WO2009115479A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
CN2009801099577A CN102066660B (zh) 2008-03-20 2009-03-16 用于造纸机或纸板机的流浆箱
JP2011500172A JP2011515595A (ja) 2008-03-20 2009-03-16 抄紙機のためのヘッドボックス
EP09722945.4A EP2255035B1 (fr) 2008-03-20 2009-03-16 Caisse de tête pour une machine a papier ou a carton

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
DE102008000778.1 2008-03-20

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Publication Number Publication Date
WO2009115479A1 true WO2009115479A1 (fr) 2009-09-24

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PCT/EP2009/053043 WO2009115479A1 (fr) 2008-03-20 2009-03-16 Sortie de matière pour une machine à papier ou à carton

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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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EP2396467A1 (fr) * 2009-02-16 2011-12-21 Stora Enso AB Processus pour la production de papier ou de carton
EP2784213A1 (fr) 2013-03-28 2014-10-01 Valmet Technologies, Inc. Caisse de tête pour une machine de production d'une bande de matière fibreuse
EP3540117A1 (fr) 2018-03-15 2019-09-18 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
CN116770624A (zh) * 2023-06-14 2023-09-19 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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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
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
EP3540119B1 (fr) * 2018-03-15 2023-08-02 Valmet Technologies Oy Machine à bande fibreuse et procédé de formation d'une bande multicouche
EP3540118B1 (fr) * 2018-03-15 2022-11-23 Valmet Technologies Oy Machine à bande fibreuse et procédé de formation d'une bande multicouche
AU2021246484A1 (en) * 2020-03-31 2022-11-24 Kimberly-Clark Worldwide, Inc. Method and apparatus for producing a zoned and/or layered substrate

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EP2396467A4 (fr) * 2009-02-16 2012-07-25 Stora Enso Ab Processus pour la production de papier ou de carton
EP2784213A1 (fr) 2013-03-28 2014-10-01 Valmet Technologies, Inc. Caisse de tête pour une machine de production d'une bande de matière fibreuse
EP3540117A1 (fr) 2018-03-15 2019-09-18 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
CN116770624A (zh) * 2023-06-14 2023-09-19 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
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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JP2011515595A (ja) 2011-05-19
EP2255035A1 (fr) 2010-12-01
DE102008000778A1 (de) 2009-09-24
CN102066660B (zh) 2012-08-08
CN102066660A (zh) 2011-05-18
EP2255035B1 (fr) 2015-02-25

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