EP3597821B1 - Dispositif de tension pour une machine destinée à la fabrication d'une bande de matière fibreuse - Google Patents

Dispositif de tension pour une machine destinée à la fabrication d'une bande de matière fibreuse Download PDF

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Publication number
EP3597821B1
EP3597821B1 EP18183869.9A EP18183869A EP3597821B1 EP 3597821 B1 EP3597821 B1 EP 3597821B1 EP 18183869 A EP18183869 A EP 18183869A EP 3597821 B1 EP3597821 B1 EP 3597821B1
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EP
European Patent Office
Prior art keywords
substrate
channels
layers
channel
filler particles
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Application number
EP18183869.9A
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German (de)
English (en)
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EP3597821C0 (fr
EP3597821A1 (fr
Inventor
Michael Straub
Matthias Hoehsl
Uwe Köckritz Dr.
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Voith Patent GmbH
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Voith Patent GmbH
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Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Priority to EP18183869.9A priority Critical patent/EP3597821B1/fr
Priority to US17/261,242 priority patent/US11473244B2/en
Priority to PCT/EP2019/064575 priority patent/WO2020015915A1/fr
Priority to CN201980047685.6A priority patent/CN112513368B/zh
Publication of EP3597821A1 publication Critical patent/EP3597821A1/fr
Application granted granted Critical
Publication of EP3597821C0 publication Critical patent/EP3597821C0/fr
Publication of EP3597821B1 publication Critical patent/EP3597821B1/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
    • D21F1/0027—Screen-cloths
    • D21F1/0063—Perforated sheets
    • 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
    • D21F1/0027—Screen-cloths
    • D21F1/0036—Multi-layer screen-cloths
    • D21F1/0045—Triple layer fabrics
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/002—Tissue paper; Absorbent paper

Definitions

  • the present invention relates to a covering for a machine for producing a fibrous web, in particular a paper, cardboard or tissue web, comprising a substrate with a top, a bottom, two side edges and a usable area between the two side edges, the usable area having a plurality of Has through channels which connect the top with the bottom of the substrate.
  • the present invention further relates to a method for producing such a covering.
  • the fibrous web is regularly transported on one or more coverings that rotate endlessly in a machine.
  • a fibrous suspension from a headbox is first applied to a forming fabric, on which the actual fibrous web is formed by dewatering, which is then transported for further drying on a press felt through a press section and then on a drying fabric through a drying section of the paper machine, before the finished paper web can be rolled up at the end of the paper machine or directly processed or refined.
  • fabrics are still used in practice for these coverings today, ie structures in which warp and weft threads are woven together on a loom.
  • the term “substrate” is to be understood as meaning a flat structure generally made of plastic, which per se, ie without the through channels introduced, is essentially impermeable to liquid. Only through the introduction of the through channels does the substrate become fluid-permeable and thus acquires its important ability to drain water from the fibrous suspension or the fibrous web.
  • the substrate can essentially be a monolithic plastic film, for example produced by extrusion or casting, or alternatively a laminate which comprises several layers. These layers can, for example, be co-extruded or they can be produced completely separately from one another and only then connected to one another.
  • the longitudinal ends of the substrate are preferably joined together by welding to make the covering endless.
  • the covering can either consist essentially only of the perforated substrate or have additional layers, such as a fleece layer, for example for producing a press felt.
  • the useful area of the substrate refers to the area on which the fibrous web is actually formed and/or transported. The useful area can extend over the entire width of the substrate or only over a smaller area that is spaced from the side edges.
  • essentially funnel-shaped through-channels are arranged so closely next to one another in the substrate that immediately adjacent through-channels on the paper side of the substrate at least touch each other, preferably overlap each other.
  • the substrate is weakened by the narrow arrangement of the through channels, it has been found that the residual structural stability of the substrate is sufficient for the requirements in the forming section of a paper machine. If immediately adjacent through channels on the paper side of the substrate overlap sufficiently strongly, a topography can be formed on this paper side that essentially resembles the interior of an egg box.
  • the originally smooth surface on the paper side of the substrate has completely, or at least almost completely, disappeared, so that essentially only the touching edges that delimit the through channels are on the paper side , as more or less thin webs remain.
  • the peripheral edge forms a contour that does not lie in a plane.
  • a very large open area for the fiber suspension can be provided on the paper side of the substrate, so that extremely uniform drainage can take place, which counteracts the tendency of the covering to mark.
  • the fibers from the fibrous suspension are deposited across the through-channels on the peripheral edges of the same, while the water can flow away through the through-channels.
  • the machine side of the substrate opposite the paper side can still be largely present as a flat surface and thus provide a sufficient contact surface in order to transmit the driving forces from rollers of the paper machine to the substrate without significant slippage.
  • the fibrous suspension can be drained too quickly, at least faster than with the usual laser-drilled substrates in which the individual through channels are spaced apart from one another.
  • draining too quickly brings with it certain disadvantages. This is how to become For example, fillers contained in the fibrous suspension and which are intended to remain in the fibrous web are washed out excessively, which in turn is detrimental to the quality of the formation.
  • the forming fabric runs dry very quickly, which leads to an increased energy requirement for operating the paper machine and to increased wear on the clothing. For these reasons, a moderate to slow drainage performance of the covering is preferable.
  • the present covering should be easy to produce and have a moderate drainage rate. If the covering according to the invention is used as a forming fabric, a particularly good formation of the fibrous web forming on it should be able to be achieved.
  • the generic covering mentioned at the beginning is characterized in that the inner surface of at least one through-channel, preferably of the majority of all through-channels, more preferably of all through-channels in the useful area of the substrate, has an average roughness depth R z which is greater than 4 ⁇ m , preferably larger than 6 ⁇ m, more preferably larger than 8 ⁇ m.
  • R z average roughness depth
  • the average roughness depth R z is determined by measuring a defined measuring section on the inner surface of a through-channel in seven Individual measuring sections are divided, with the middle five measuring sections being the same size. The evaluation is only carried out over these five measuring sections, since the Gaussian filter to be used requires half a single measuring section before or after or a fold has a non-negligible inlet and outlet behavior. The difference between the maximum and minimum values is determined for each of these individual measuring sections of the profile. The average value is formed from the five individual roughness depths obtained.
  • the covering according to the invention is preferably a forming fabric, or is used as such.
  • the through channels can advantageously have a shape and be arranged in the substrate in such a way as at the beginning with regard to the subsequently published European patent application EP 18168641.1 described by the applicant.
  • the through channels can be essentially funnel-shaped. In the sense of the present application, this means that the through channels are starting from from the paper side of the substrate in the thickness direction of the substrate towards a central region which lies between the paper side and the machine side, or between the top and bottom of the substrate, or even up to the machine side, preferably continuously. Although this funnel-shaped taper already slows down the flow velocity in the through-channel, the taper cannot be made arbitrarily strong.
  • the inventive adjustment of the roughness of the inner surface of the through-channel is of essential importance in optimizing the flow velocity in the through-channel of the substrate.
  • the average roughness depth R z is less than 20 ⁇ m, preferably less than 15 ⁇ m. If the dewatering is too slow, the fibrous web, at least if the covering according to the invention is used as a forming fabric of a paper machine, is transferred to the press section and subsequent drying section with excessive residual moisture, which is disadvantageous with regard to the energy consumption of the paper machine.
  • the substrate is a laser-drilled substrate, with the through channels being introduced into the substrate by means of a laser. It is usually clear from the finished covering how the through channels were introduced into the substrate, for example by punching or by mechanical drilling or by laser drilling. During laser drilling, the substrate material melts and/or sublimates, with some of the evaporated material usually re-precipitating on the substrate as condensate. This leaves characteristic marks in the borehole and around the borehole. If the substrate of the covering according to the invention is a laminate which consists of more than one layer, the term “laser-drilled” substrate means that the finished laminate has been perforated with a laser.
  • passage channels can first be introduced into the individual layers of the laminate, whereby the passage channels of the individual layers can have different diameters, and only then these layers are connected to one another, are not practical, especially since it is not possible to separate the individual layers with the necessary precision so that through channels are reliably formed everywhere that connect the top with the bottom of the finished substrate.
  • such embodiments are explicitly not to be understood as “laser-drilled substrates” in the sense of the present invention, but rather the individual layer in such a laminate could be understood as a “laser-drilled substrate”.
  • the ratio between a minimum diameter of the through channels and a thickness of the substrate is between 1:3 and 1:10, preferably between 1:4 and 1:8, more preferably between 1:5 and 1 :7. If the thickness of the substrate is at least four times as large as the minimum diameter of the through-channel, the effect that the roughness of the inner surface of the through-channel has on the flow velocity in the form of a throttling only comes into effect effectively. However, if the substrate is thinner, the roughness does not lead to a reduction in flow velocity to the same extent. As an approximation, knowledge of pressure losses in perforated plates through which flow can be used can be used.
  • the minimum diameter of a through channel can be described as the minimum distance from one point on the inner surface to an opposite point on the inner surface of the through channel, measured in a plane parallel to the plane of the substrate.
  • the thickness of the substrate refers to the distance between the top and bottom of the substrate. If the top side of the substrate no longer has a smooth surface that lies in one plane after the through channels have been introduced into the substrate, then the highest one is To use the point of the top, i.e. the point that is the greatest distance from the bottom of the substrate, it being assumed that the bottom of the substrate still has an essentially smooth surface that lies in a plane.
  • the substrate preferably has a thickness between 500 ⁇ m and 1500 ⁇ m, more preferably between 600 ⁇ m and 1200 ⁇ m and even more preferably between 800 ⁇ m and 1000 ⁇ m.
  • the corresponding dimensions of the through channels are then based on these values.
  • Providing the inner surface of a through channel according to the present invention with an average roughness depth R z which is greater than 4 ⁇ m, preferably greater than 6 ⁇ m, more preferably greater than 8 ⁇ m is not trivial.
  • an average roughness depth R z which is greater than 4 ⁇ m, preferably greater than 6 ⁇ m, more preferably greater than 8 ⁇ m is not trivial.
  • internal surfaces are created that have a noticeably lower average roughness depth R z .
  • Two concrete ideas are therefore proposed below, with the help of which such a large average roughness depth R z can be reliably generated. These two ideas can be used alternatively or cumulatively.
  • the substrate in addition to a matrix material, also has filler particles, the material of the filler particles being able to be converted into the gas phase slower or faster than the matrix material when irradiated with laser light.
  • the inner surface of a laser-drilled through-channel with projections and/or recesses, which act as a kind of "turbulence generator" for the liquid flowing through the through-channel.
  • the turbulence thus introduced in the through-channel reduces the flow velocity.
  • the matrix material can also contain other substances and can therefore be designed, for example, as a composite material.
  • the filler particles have an average diameter between 20 ⁇ m and 150 ⁇ m, preferably between 50 ⁇ m and 100 ⁇ m, with the filler particles preferably being essentially spherical.
  • the substrate can be a laminate formed from several layers.
  • the substrate can be formed from several layers, preferably from 2 to 6 layers, more preferably from 3 to 5 layers.
  • the desired roughness can be achieved if a basic shape of the through channels at a boundary between two adjacent layers of the substrate has an offset in a direction that lies in the plane of the substrate.
  • the offset acts as a turbulence generator for the flow in the through-channel.
  • “Basic shape” means the shape of the through channels that they would have without the offset.
  • the basic shape can, for example, essentially correspond to the geometric shape of a truncated cone or, in extreme cases, that of a straight circular cylinder. Due to the offset at at least one boundary between two adjacent layers, preferably at all boundaries between two adjacent layers, this basic shape is disturbed by the corresponding offset. It is to the credit of the inventors that they have found a way in which such an offset can be reliably produced in laser-drilled substrates that are formed from a laminate comprising several layers, the corresponding manufacturing process being discussed in more detail below.
  • the average roughness R z can be as it usually occurs when laser drilling a substrate without any special precautions.
  • the average roughness depth R z of the inner surface of at least one through-channel, preferably of the majority of all through-channels, more preferably of all through-channels in the useful area of the substrate within the area of at least one layer can be smaller than 4 ⁇ m, preferably smaller than 3 ⁇ m, more preferably smaller than 2 ⁇ m or even be smaller than 1 ⁇ m.
  • the present invention relates to a method for producing a previously described covering, wherein at least one through-channel, preferably the majority of all through-channels, more preferably all through-channels in the useful area of the substrate is or are introduced into the substrate by means of a laser.
  • the substrate is formed by adding filler particles to a matrix material which forms the main component of the substrate, the material of the filler particles moving slower or faster when irradiated with laser light the gas phase can be transferred as the matrix material.
  • the substrate can have several layers, with the concentration of the filler particles being different between at least two of these layers. In this way it is possible to adjust the degree of reduction for the drainage of the through channels more finely. Furthermore, the outermost layer of the substrate on the top or paper side and/or the outermost layer of the substrate on the bottom or machine side can be free of filler particles in order not to cause any undesirable effects upon contact with the fibrous web or machine parts . In other words, only one or more middle layers can have a filler material.
  • the substrate is formed from several layers, with the individual layers being connected to one another by means of an auxiliary material, in particular an adhesive layer, with the substrate then being rolled up and unrolled again to introduce the through channels.
  • the adhesive can preferably be a solvent-containing polyester resin.
  • the projections and recesses thus created for the flow in the through-channel lead to an increase in the average roughness depth R z of the inner surface of the through-channel. They serve as turbulence generators for the flow and thus lead to the desired throttling of the flow.
  • the substrate is applied to an essentially flat surface in the area in which the through channels are introduced into the substrate using the laser, preferably by means of negative pressure.
  • a so-called vacuum table can be used for this.
  • the through-channel or through-channels are each introduced into the substrate by means of a single pulse of the laser. Although more than one pulse could also be used, tests have shown that when multiple pulses are used, the opening angle of the essentially frusto-conical through channels becomes very large, which can be disadvantageous with regard to the structural stability of the finished product.
  • Figures 1 and 2 show schematically a device 10' known from the prior art or a method for drilling through channels 30' into a substrate 20' using a laser.
  • the laser is controlled by a computer or controller. It sends a laser beam LB perpendicular to the top 22' of the substrate 20'.
  • passage channels 30' of different shapes can be created with the laser by melting and/or sublimating the material of the substrate 20', which extend in the thickness direction TD of the substrate 20' from the top 22' to the bottom 24'.
  • the substrate 20' consists of a plastic film, which per se, ie before perforation by the laser, is initially impermeable to liquids.
  • the through channel 30' has the shape of a straight circular cylinder.
  • the through-channel 30' has the shape of a truncated cone that tapers from the top 22' to the bottom 24' of the substrate 20'.
  • the through-channel 30' has an hourglass-shaped shape, i.e. a shape in which the diameter of the through-channel 30', starting from the top 22', initially increases to a central region MR of the substrate 20', which is between the top 22' and the bottom 24 'is arranged, tapers and then widens again starting from the central region MR to the underside 24' of the substrate.
  • Figure 2 shows how an endless substrate 20', stretched over two rollers R, is perforated by means of the laser with a large number of passage channels 30' arranged essentially in a checkerboard manner.
  • the laser moves continuously from a side edge 26' to the side edge 28' of the substrate 20' opposite in the width direction WD and back or vice versa in order to drill the through channels 30'.
  • the through channels 30' can be evenly distributed over the entire width, or the perforated, usable area of the substrate 20' is narrower, depending on the desired application.
  • the substrate 20' can already represent the finished covering, for example the finished forming fabric of a paper machine, or it can be further processed. For example, it can be provided with at least one layer of staple fibers in order to be used as a press felt in a paper machine. Or strips of the substrate 20' can be spiraled up in order to be able to achieve larger widths of the covering.
  • the respective inner surface 32' of the through-channel 30' is always essentially smooth, ie has an average roughness depth R z of well below 4 ⁇ m.
  • R z average roughness depth
  • the through channels are arranged so close to one another that they touch or even overlap on the top side 22 'of the substrate 20', a smooth wall can have a negative effect, as this results in too rapid drainage of the fibrous web that is transported on the covering will, takes place.
  • the reduction in the drainage speed is achieved according to the invention by specifically increasing the roughness of the inner surface 32 of the through-channel 30.
  • FIGS. 4a and 4b show a section of a substrate 20 with a single through channel 30 delimited by a dashed line according to a first exemplary embodiment of the present invention.
  • Figure 4a shows a top view of the top 22 of the substrate 20, whereas
  • Figure 4b a sectional view along the section plane IVb - IVb Figure 4a shows.
  • the substrate 20 is a laminate formed from four layers, where the individual layers can all have essentially the same thickness, ie the same dimension in the thickness direction TD.
  • the individual layers can be connected to one another using an adhesive.
  • the substrate essentially consists of a polymer base material.
  • filler particles 40, 42 are added to the two middle layers of the substrate 20, with one of the two middle layers exclusively containing filler particles 40 of a first type and the other of the two middle layers exclusively containing filler particles 42 of a second type different from the first can have.
  • both layers could also have the same type of filler particles 40, 42 or both types of filler particles 40, 42. It should be noted that these filler particles are only shown schematically in the figures and not to scale.
  • the filler particles 40 of the first type have the property that they change into the melting and/or vapor phase less quickly or not at all when irradiated with laser light. Therefore, these filler particles 40 remain as projections 44 on the inner surface 32 of the laser-drilled through-channel 30 and thus cause turbulence in the flow of the fluid, which flows through the through-channels 30 when the covering according to the invention is used as intended.
  • the filler particles 42 of the second type have the property that they transition into the melting and/or vapor phase significantly faster or more easily when irradiated with laser light. Therefore, when these filler particles 40 disappear, they leave behind recesses 46 on the inner surface 32 of the laser-drilled through-channel 30 and in this way also cause turbulence in the flow of the fluid, which flows through the through-channels 30 when the covering according to the invention is used as intended.
  • the roughness of the inner surface 32 of the through-channel 30 can be determined via the concentration density of filler particles 40, 42 in the matrix material of the substrate and thus adjust the throttling effect on the flow.
  • the average roughness depth R z of the inner surface 32 of the through channel 30 is increased according to the invention to over 4 ⁇ m, preferably over 6 ⁇ m, more preferably over 8 ⁇ m.
  • the two outermost layers of the substrate 20 are free of filler particles 40. 42. This is advantageous in order to prevent the filler particles from having an undesirable effect when they come into direct contact with the fibrous web or parts of the material to be dewatered Machine when the covering according to the invention is used as intended, but this is not absolutely necessary.
  • at least one of the two outermost layers can also specifically contain fillers, particularly when the fillers serve as a separating aid.
  • filler particles 40, 42 shown here have a substantially spherical basic shape. However, this is not absolutely necessary either.
  • FIGs 5a and 5b is a section of a substrate 20 with a through channel 30 shown according to a second embodiment.
  • the special features of this second embodiment can be used alternatively or cumulatively to the special features of the first embodiment.
  • the substrate 20 is formed as a multi-layer laminate, with four layers being present here, the extent of which is essentially the same size in the thickness direction TD.
  • the basic shape of the through channel 30, which here essentially corresponds to a truncated cone tapering from the top 22 to the bottom 24 of the substrate 20, has an offset at the respective boundaries between two immediately adjacent layers of the substrate . This offset leads to projections 44 and recesses 46 for the through-channel 30 Through-channel in the intended use of the covering according to the invention through which liquid flows. This introduces turbulence into the liquid, which reduces the flow velocity in the through-channel 30.
  • the projections 44 and the recesses 46 ensure that the average roughness R z of the inner surface 32 of the through channel is greater than 4 ⁇ m, preferably greater than 6 ⁇ m, more preferably greater than 8 ⁇ m. In the area between two adjacent layer boundaries, however, the average roughness R z is again significantly lower. If the average roughness depth R z is also to be increased in these areas, one can, for example, resort to the previously described features of the first exemplary embodiment. However, care must be taken to ensure that the flow velocity in the through-channel 30 is not throttled too much so that the fibrous web transported on the substrate when the covering according to the invention is used as intended can be adequately drained.
  • the projections 44 and the recesses 46 can be reliably and reproducibly produced in this embodiment by connecting or laminating the individual layers of the laminate to one another via an adhesive, preferably a solvent-containing polymer resin, then the laminate is rolled up, unrolled again for laser drilling and essentially stretched onto a flat plane in the area of the hole.
  • an adhesive preferably a solvent-containing polymer resin
  • This effect can be explained by internal stresses in the material, which are briefly released by the heat and force during laser drilling. This effect can be used specifically to increase the roughness in the through-channel 30 and thus to reduce the flow velocity through the through-channel 30.
  • the present invention comes into effect particularly advantageously when the covering is a forming fabric and when the individual through-channels 30 are placed so closely next to one another that they at least touch, preferably overlap, on the top side 22 or paper side, as described at the beginning.
  • the basic shape of the through channel 30 is always essentially frustoconical. However, this is not mandatory. In practice, the through channels 30 can also have a more or less different basic shape.

Claims (10)

  1. Habillage pour une machine destinée à la fabrication d'une bande de matière fibreuse, en particulier d'une bande de papier, de carton ou de papier-tissu, comprenant un substrat (20) doté d'un côté supérieur (22), d'un côté inférieur (24), de deux bords latéraux et d'une région utile entre les deux bords latéraux, la région utile présentant une pluralité de canaux de passage (30), lesquels relient le côté supérieur (22) au côté inférieur (24) du substrat (20), le substrat (20) étant un substrat (20) percé au laser, les canaux de passage (30) étant introduits dans le substrat (20) au moyen d'un laser, caractérisé en ce que la surface intérieure (32) d'au moins un canal de passage (30), de préférence de la majorité de tous les canaux de passage (30), de préférence encore de tous les canaux de passage (30) dans la région utile du substrat (20) présente une profondeur de rugosité moyenne Rz, laquelle est supérieure à 4 um, de préférence supérieure à 6 um, de préférence encore supérieure à 8 µm.
  2. Habillage selon la revendication 1,
    caractérisé en ce que la profondeur de rugosité moyenne Rz est inférieure à 20 um, de préférence inférieure à 15 µm.
  3. Habillage selon l'une des revendications précédentes,
    caractérisé en ce que le rapport entre un diamètre minimal des canaux de passage (30) et une épaisseur du substrat (20) est compris entre 1:3 et 1:10, de préférence entre 1:4 et 1:8, de préférence encore entre 1:5 et 1:7.
  4. Habillage selon l'une des revendications précédentes,
    caractérisé en ce que le substrat (20) présente, en plus d'une matière de matrice, en outre des particules de matière de charge (40, 42), la matière des particules de matière de charge (40, 42) pouvant être amenée plus lentement ou plus rapidement à la phase gazeuse que la matière de matrice lors de l'exposition à de la lumière laser.
  5. Habillage selon la revendication 4,
    caractérisé en ce que les particules de matière de charge (40, 42) présentent un diamètre moyen compris entre 20 um et 150 um, de préférence entre 50 um et 100 um, les particules de matière de charge (40, 42) étant de préférence de forme sensiblement sphérique.
  6. Habillage selon l'une des revendications précédentes,
    caractérisé en ce que le substrat (20) est formé à partir de plusieurs couches, de préférence à partir de 2 à 6 couches, de préférence encore à partir de 3 à 5 couches.
  7. Habillage selon la revendication 6,
    caractérisé en ce qu'une forme de base des canaux de passage (30) au niveau d'une limite entre deux couches adjacentes du substrat (20) présente un décalage dans une direction qui se situe dans le plan du substrat (20).
  8. Habillage selon la revendication 6 ou 7,
    caractérisé en ce que la profondeur de rugosité moyenne Rz de la surface intérieure (32) d'au moins un canal de passage (30), de préférence de la majorité de tous les canaux de passage (30), de préférence encore de tous les canaux de passage (30) dans la région utile du substrat (20) à l'intérieur de la région d'au moins une couche est inférieure à 4 um, de préférence inférieure à 3 um, de préférence encore inférieure à 2 um ou même inférieure à 1 µm.
  9. Procédé de fabrication d'un habillage selon l'une des revendications précédentes,
    dans lequel au moins un canal de passage (30), de préférence la majorité de tous les canaux de passage (30), de préférence encore tous les canaux de passage (30) dans la région utile du substrat (20) est ou sont introduit(s) dans le substrat (20) au moyen d'un laser, caractérisé en ce qu'avant l'étape d'introduction des canaux de passage (30), le substrat (20) est formé, par le fait qu'à une matière de matrice, laquelle forme le composant principal du substrat (20), sont ajoutées des particules de matière de charge (40, 42), la matière des particules de matière de charge (40, 42) pouvant être amenée plus lentement ou plus rapidement à la phase gazeuse que la matière de matrice lors de l'exposition à de la lumière laser,
    de préférence le substrat (20) présentant plusieurs couches et la concentration des particules de matière de charge (40, 42) étant différente entre au moins deux de ces couches,
    et/ou caractérisé en ce que le substrat (20) est formé à partir de plusieurs couches, les couches individuelles étant reliées les unes aux autres au moyen d'un agent auxiliaire, en particulier d'une couche d'adhésif, le substrat (20) étant ensuite enroulé et à nouveau déroulé pour l'introduction des canaux de passage (30),
    de préférence le substrat (20), dans la région dans laquelle les canaux de passage (30) sont en train d'être introduits dans le substrat (20) au moyen du laser, étant appliqué sur une surface sensiblement plane, de préférence au moyen d'une dépression.
  10. Procédé selon la revendication 9,
    caractérisé en ce que le canal de passage (30) ou les canaux de passage (30) est ou sont introduit(s) dans le substrat (20) respectivement au moyen d'une seule impulsion du laser.
EP18183869.9A 2018-07-17 2018-07-17 Dispositif de tension pour une machine destinée à la fabrication d'une bande de matière fibreuse Active EP3597821B1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP18183869.9A EP3597821B1 (fr) 2018-07-17 2018-07-17 Dispositif de tension pour une machine destinée à la fabrication d'une bande de matière fibreuse
US17/261,242 US11473244B2 (en) 2018-07-17 2019-06-05 Clothing for a machine for producing a fibrous material web
PCT/EP2019/064575 WO2020015915A1 (fr) 2018-07-17 2019-06-05 Entoilage pour une machine servant à la fabrication d'une bande de matière fibreuse
CN201980047685.6A CN112513368B (zh) 2018-07-17 2019-06-05 用于制造纤维料幅的机器的网毯

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CN113547607B (zh) * 2021-07-22 2023-02-24 河北工业大学 一种制备3d打印定向钢纤维增强水泥基复合材料的装置

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SE429769B (sv) 1980-04-01 1983-09-26 Nordiskafilt Ab Arkaggregat och sett att tillverka detsamma
US5837102A (en) 1997-04-24 1998-11-17 Voith Sulzer Paper Technology North America, Inc. Perforated and embossed sheet forming fabric
DE102007024847A1 (de) * 2007-05-29 2008-12-04 Voith Patent Gmbh Papiermaschinenbespannung
EP3321405A1 (fr) * 2008-09-11 2018-05-16 Albany International Corp. Bande perméable pour la fabrication de mouchoirs, serviettes ou non-tissés
CA2750821A1 (fr) * 2009-01-28 2010-08-05 Albany International Corp. Etoffe industrielle pour production de non tisses et procede pour sa fabrication
DE202010016701U1 (de) * 2010-12-16 2011-04-14 Voith Patent Gmbh Sieb
DE102012210768A1 (de) * 2012-06-25 2014-01-02 Voith Patent Gmbh Verfahren zur Einbringung von Durchgangsbohrungen mit Hilfe von Laserstrahlen in ein flächig ausgebildetes Substrat, insbesondere eine bandförmige Folie
DE102012210765A1 (de) * 2012-06-25 2014-01-02 Voith Patent Gmbh Verfahren zur Einbringung von Bohrlöchern mit Hilfe von Laserstrahlen in ein flächig ausgebildetes Substrat, insbesondere eine bandförmige Folie
WO2015185278A1 (fr) * 2014-06-02 2015-12-10 Voith Patent Gmbh Procédé de fabrication d'une toile de machine à papier
EP3348708B1 (fr) 2018-04-23 2020-06-10 Voith Patent GmbH Toile pour machine à papier et procédé pour sa fabrication

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WO2020015915A1 (fr) 2020-01-23
US20210269976A1 (en) 2021-09-02
EP3597821C0 (fr) 2024-01-03
CN112513368A (zh) 2021-03-16
US11473244B2 (en) 2022-10-18
CN112513368B (zh) 2023-03-17
EP3597821A1 (fr) 2020-01-22

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