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EP4424909B1 - Habillage de machine à bande fibreuse avec joints de bord et son procédé de production - Google Patents

Habillage de machine à bande fibreuse avec joints de bord et son procédé de production

Info

Publication number
EP4424909B1
EP4424909B1 EP23159843.4A EP23159843A EP4424909B1 EP 4424909 B1 EP4424909 B1 EP 4424909B1 EP 23159843 A EP23159843 A EP 23159843A EP 4424909 B1 EP4424909 B1 EP 4424909B1
Authority
EP
European Patent Office
Prior art keywords
clothing
base fabric
fiber web
curable sealant
fabric
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP23159843.4A
Other languages
German (de)
English (en)
Other versions
EP4424909A1 (fr
Inventor
Wan Zeti Zafina WAN AHMAD NATHRI
Anas ALIAS
Izharraj Karapayah
Syahrul Ramadhan Ahmad Kamal Ariffin
Uwe Köckritz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
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 EP23159843.4A priority Critical patent/EP4424909B1/fr
Publication of EP4424909A1 publication Critical patent/EP4424909A1/fr
Application granted granted Critical
Publication of EP4424909B1 publication Critical patent/EP4424909B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • D21F1/0027—Screen-cloths
    • 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
    • D21F1/30—Protecting wire-cloths from mechanical damage
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F7/00—Other details of machines for making continuous webs of paper
    • D21F7/08—Felts

Definitions

  • the present invention refers to a fiber web machine clothing, in particular a paper machine clothing, adapted to run as a continuous loop in a fiber web machine while carrying a fiber web through at least a portion of said machine, the clothing comprising a permeable base fabric which is substantially made up from yarns, wherein the base fabric has a fiber web carrying surface and an opposite running surface, as well as two opposite lateral edges, wherein the clothing further comprises a pair of continuous edge sealing strips formed along the lateral edges of the base fabric, said strips comprising a U.V. curable sealant adhered to each edge portion, the U.V.
  • curable sealant forming a coating comprising a continuous and uniform, impermeable bead over said fiber web carrying surface and the running surface, said bead extending through interstices of the base fabric thereby stabilizing the yarns in the edge portions of the base fabric and protecting the edge portions from wear.
  • the invention refers to a method of producing such a fiber web machine clothing.
  • the running of fiber web machine clothings is often aligned by so-called guide spades which can be made for example from metal or ceramic materials.
  • guide spades can be made for example from metal or ceramic materials.
  • the edges of a fiber web machine clothing are subject to wear and tear over the time. This is particularly true if the clothing is circulated at high machine speeds, such as speeds of up to 2.000 m/min or even higher.
  • US 5,506,033 has already proposed to replace the two-component polyurethane material by a silicone rubber material.
  • the silicone rubber material can be cured by ultraviolet radiation to become tack-free in only a few seconds after its application to the edge portions of the base fabric.
  • silicone rubber material has adhesion to the yarns of the base fabric is relatively poor resulting in small pull-out loads needed to pull out the yarns from the silicone rubber material used as sealant.
  • Another problem of silicone rubber material is that it does not provide a very good grip for the clothing. If the clothing is for example a dryer fabric that is running over the outer surface of drying cylinders of a paper making machine, there exists the risk of guiding problems of the dryer fabric.
  • acrylic material can be used as U.V. curable sealant, which allows immediate polymerization into a non-tacky condition after application to the edge portions of the base fabric of the clothing.
  • U.V. curable acrylic material offers better grip, e.g. to the outer surfaces of drying cylinders compared to silicone rubber material.
  • the clothing is a dryer fabric adapted to run through at least a portion of a dryer section of the fiber web machine.
  • the dryer fabric can or should be adapted to be used the dryer section at a temperature of 90-180°C and/or at a steam pressure of up to 9 bar and/or at a machine speed of up to 2.000m/min. It was found out that using acrylic material for sealing the edge portions of such dryer fabrics perfectly matches these conditions.
  • the base fabric is a woven fabric. That means that comprises machine direction yarns and cross-machine direction yarns that are interwoven with each other.
  • the base fabric may be a single layer fabric or may comprise several layers. If the fiber web machine clothing is for example a press felt, a batt of staple fibers may be attached, preferably needled, to the base fabric.
  • the base fabric might be a flat woven or a round woven fabric.
  • the base fabric is a spiral fabric. Spiral fabrics are frequently used in the field of dryer fabrics. Above-mentioned prior art document US 5 506 033 describes and shows in its figure 2 an example of such a spiral fabric.
  • the fabric is formed of a plurality of transversely extending coiled monofilament yarns which are interconnected with a plurality of transversely extending monofilament pintles.
  • the yarns and pintles are preferably formed of polyaryletherketone polymers PEEK, polyphenylene sulfide, RYTON, or other similar heat resistant, moisture resistant filaments.
  • the end portions of the pintles and yarns can be fused together and the dryer fabric can be formed as a continuous loop.
  • the term "yarns" in the sense of the present invention shall also encompass the pintles of such a spiral fabric.
  • the impermeable beads does not need to have a width of more than 50mm. Preferably their width is between 20mm and 45mm.
  • the maximum thickness of the impermeable beads preferably does not exceed the maximum thickness of the base fabric by more than 20%.
  • the impermeable beads may exceed each of the fiber web carrying surface and the opposite running surface of the base fabric by 1% to 10% of the caliper of the base fabric.
  • the impermeable beads preferably each have a substantially flat fiber web carrying surface and/or a substantially flat an opposite running surface. Furthermore, the beads preferably completely fill out the interstices of the yarns of the base fabric.
  • the acrylic material shall not only decrease the free spaces formed between the yarns of the base fabric but should form some kind of impermeable monolithic block around them.
  • the viscosity of the acrylic material should be sufficiently low. Good results are achievable if the U.V. curable sealant has a viscosity of 2.800 mPa s to 6.500 mPa s before being cured. mPa s stands for milipascal-second. 1 mPa s corresponds to 1 cP, i.e. 1 centipoise. Notably, the viscosity of water at 20°C is almost exactly 1 cP.
  • the U.V. curable sealant can comprise at least one of the following components:
  • the above-mentioned problems are also solved by a method of producing a fiber web machine clothing according to the present invention as described above, the method comprising the following steps:
  • the distance between the position where the U.V. curable sealant is applied to the edge portions and the position where the U.V. curable sealant is cured is not larger than 200cm, preferably is between 90cm and 120cm.
  • the distance should be kept as small as possible but must be large enough to give the liquid acrylic material sufficient time to fully penetrate the woven base fabric at its edge portions.
  • the time depends upon the density of the base fabric, the density of the sealant material and also the moving speed of the base fabric during the coating and curing process. This speed can be chosen so that during the coating step b) and the curing step c) the base fabric is moving with a process speed between 8m/min and 12m/min relative to the dispensing system and/or the U.V. source.
  • the U.V. curable sealant can leave the dispensing system with a pressure between 2,5 bar and 6,5 bar and/or with a flow rate between 250 g/min and 950 g/min.
  • the U.V. intensity of the U.V. source for curing the U.V. curable sealant should not be larger than 250mW/cm 2 , preferably it should be between 40mW/cm 2 and 100mW/cm 2 .
  • Figure 1 shows a portion of a fiber web machine clothing 10, especially a paper machine clothing.
  • the clothing 10 is preferably a dryer fabric.
  • the fiber web machine clothing 10 comprises a base fabric 12.
  • the base fabric is a spiral fabric formed of a plurality of transversely extending coiled monofilament yarns 14 which are interconnected with a plurality of transversely extending monofilament pintles.
  • the base fabric 12 has two opposite lateral edges 18, one of which is shown in figure 1 .
  • the clothing 10 further comprises a pair of continuous edge sealing strips 20 (only one portion thereof is shown in figure 1 ) formed along the lateral edges 18 of the base fabric 12.
  • the sealing strip 20 covers a certain width w of the edge portion of the base fabric 12, preferably a width w between 20mm and 45mm.
  • the sealing strip 20 comprises a U.V. curable sealant which comprises or consists of an acrylic material. It forms an impermeable bead over the fiber web carrying surface and the opposite running surface of the base fabric 12, said bead extending through interstices of the base fabric 12 thereby stabilizing the yarns 14 in the edge portions of the base fabric 12 and protecting the edge portions from wear.
  • the bead or the acrylic material of the bead completely fills out the interstices of the yarns 14 of the base fabric 12.
  • the acrylic material shall not only decrease the free spaces formed between the yarns 14 of the base fabric 12 but should form some kind of impermeable monolithic block around them.
  • the overall thickness of the bead is preferably slightly larger than the overall thickness that is also called caliper of the base fabric 12.
  • the diagram shown in figure 2 illustrates on the y-axis the mass distribution in % of the material at the edge portion of the clothing 10, going from the fiber web carrying surface (at 0mm on the x-axis) down to the running surface (at about 1.7mm on the x-axis).
  • the mass distribution might have been measure in a sample area SA of the edge portion that is shown with a dotted line in figure 1 .
  • To find out the mass distribution it is possible to make a computer tomographic scan of the clothing 10 at the sample area SA and then to make a number of slices parallel to the sample area SA, wherein each slice is going down a little bit in the thickness direction of the clothing 10.
  • the ratio between material and free space is evaluated which give the mass distribution (y-value in the diagram of figure 2 ) in that particular depth (x-value in the diagram of figure 2 ). If the slice is completely filled with material, the mass distribution value is 100%. If the slice only comprises air and, thus, no solid material, the mass distribution value is 0%.
  • figure 2a shows a couple of such slices.
  • 100 slices have been made going down in the thickness direction of the clothing from the fiber web carrying surface (slice number 1) to the running surface (slice number 100). Only the slices with numbers 15, 30, 45 and 90 are shown.
  • the lower part of figure 2a refers to inventive embodiment with acrylic material, whereas the upper part refers to the comparative example with polyurethane type A.
  • the slices shown in figure 2a do not correspond exactly to the sample area SA shown in figure 2 . Instead, the slices are chosen so that only the lower part of each slice refers to the edge region, while the upper part is outside the edge region.
  • slices number 45 from the middle of the clothing in its thickness direction does not show significant differences between the inventive embodiment and the comparative example.
  • slices number 14 and 90 at the fiber web carrying surface and the running surface, respectively significantly differ from each other.
  • the lowest curve in the diagram of figure 2 illustrates the mass distribution of the base fabric 12 alone, i.e. of the coiled monofilament yarns 14 and the transversely extending monofilament pintles 16 in this exemplary embodiment.
  • the mass distribution curve of the base fabric has a clear peak in the middle between the fiber web carrying surface and the running surface and decreases rapidly from that peak. However, even at the peak the mass distribution value is only about 80% meaning that about 20% is just air. The reason for this is that the base fabric 12 comprises a lot of free space due to the typical topography of a spiral fabric.
  • Another curve in the diagram of figure 2 illustrates - as a comparative example - the mass distribution of the same base fabric 12 provided with a typical polyurethane-based sealant (a polyurethane of type A), as known form the prior art.
  • the polyurethane-based sealant material fills out almost completely the interstices of the base fabric 12 in its middle between the fiber web carrying surface and the running surface.
  • the platform of the curve (where the mass distribution is almost 100%) is rather small compared to the overall thickness or caliper of the clothing 10, resulting from the fact that the upper and lower surfaces of the polyurethane-based sealant are quite uneven.
  • a third curve in the diagram of figure 2 shows the mass distribution of the clothing 10 of figure 1 which comprises the acrylic material as sealant.
  • the acrylic material as a sealant according to the present invention, it is possible and preferred to have a curve that resembles almost a rectangle.
  • the mass distribution value is almost 100% along almost the complete caliper of the clothing 10, i.e. from the fiber web carrying surface to the running surface. That means that the upper and lower surfaces of the acrylic-based sealant are preferably substantially flat.
  • a more uniform mass distribution of almost 100% along almost the complete caliper also means that more sealant material is provided within the voids or interstices of the base fabric 12, which leads to a better protection of the yarns of the base fabric from wear and tear.
  • sealant material that is based on acrylic material is advantageous when trying to achieve a uniform mass distribution of almost 100% along almost the complete caliper, because such sealant material can be forced into the interstices of the base fabric by using e.g. a high precision, double-acting dispense valve with a high resolution stroke of up to 50 bar.
  • sealant material that is based on polyurethan or silicone this is usually not possible, mainly due to the usually higher viscosity of such materials.
  • a sealant material that is based on a polyurethan having 2 components needs to be mixed within certain ratios. A mismatch in mixing can easily create non-cured or over-cured material and difficulties when passing through coating devices during the process. Also the cleaning efforts of the dispenser valve is much higher when using a polyurethan-based sealant.
  • the diagram shown in figure 3 compares the maximum pull-out load measured in pound-force [Ibf] of different types of sealants. Notably, 1 pound-force [Ibf] corresponds to about 4.45 Newton [N]. From this diagram it can be clearly derived that using acrylic material for edge sealing leads to much higher maximum pull-out forces of the yarns in the edge region than using silicone rubber or polyurethane-based materials, that are known from the prior art. Consequently, the edges can be better protected.
  • fabrics with coated edges can be tensioned on a universal tester machine. A coated yarn on one side of the edges can be pulled out in fabric's machine direction. When the yarn is pulled out, it will pass through cured sealant material.
  • the sealant material is "strong” enough the yarn will break or snap off at a later distance compared to a "weak” sealant material.
  • the yarns of the base fabric 12 are more “intertwined” with the sealant material which leads to a higher maximum pull-out load.
  • figure 4 schematically shows how the clothing 10 with the edge sealing according to the present invention can be manufactured. More details as to the general manufacturing process of an edge seal based on a U.V. curable material may be taken from figures 5 to 7 and the corresponding passages in the description of the above-mentioned prior art document US 5 506 033 .
  • a permeable base fabric 12 which is substantially made up from yarns, such as the base fabric 12 shown in figure 1 , is moving from the right side to the left side in figure 4 , preferably with a speed between 8m/min and 12m/min.
  • the lateral edge portions of the base fabric 12 are first coated via a dispensing system 22 with a U.V. curable sealant which - according to the present invention - comprises or consists of an acrylic material.
  • the acrylic material is applied to the edge portions of the base fabric 12 from both sides at the same time, i.e. from the fiber web carrying surface and the opposite running surface of the base fabric 12.
  • Good practical results have been achieved if the U.V. curable sealant leaves the dispensing system 22 with a pressure between 2,5 bar and 6,5 bar and with a flow rate between 250 g/min and 950 g/min.
  • the U.V. curable sealant is cured by using irradiation from a U.V. source 24 to thereby form a pair of continuous edge sealing strips 20.
  • a U.V. source 24 is irradiating the still liquid curable sealant also from both sides.
  • the distance D between the dispensing system 22 and the U.V. source 24 measured in the moving direction of the base fabric 12 is preferably between 90cm and 120cm. That provides sufficient time for the still liquid acrylic material, which preferably has a viscosity of 2.800 mPa s to 6.500 mPa s, to substantially fill out completely the interstices at the edge portion of the base fabric 12 before being cured.
  • the U.V. source 24 for curing the U.V. curable sealant is preferably between 40mW/cm 2 and 100mW/cm 2 , more preferably between 50mW/cm 2 and 90mW/cm 2 .
  • a radiometer might be used to measure the U.V. intensity. Based on the measured value the corresponding U.V. intensity of the U.V. sources 24 can be controlled or adjusted to a pregiven value.
  • the U.V. source 24 can comprise an iron-type bulb having a non-tacky surface. As an alternative, a mercury bulb might be used.

Landscapes

  • Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)

Claims (15)

  1. Toile (10) pour machine à nappe de fibres, notamment une toile pour machine à papier (10), adaptée pour s'étendre sous forme de boucle continue dans une machine à nappe de fibres, tout en transportant une nappe de fibres à travers au moins une partie de ladite machine, la toile (10) comprenant un tissu de base perméable (12) qui est essentiellement constitué de fils (14, 16), le tissu de base comportant une surface de support de nappe de fibres et une surface de roulement opposée, ainsi que deux bords latéraux opposés (18).
    la toile (10) comprenant en outre une paire de bandes d'étanchéité de bord continues (20) formées le long des bords latéraux (18) du tissu de base (12), lesdites bandes (20) comprenant un produit d'étanchéité durcissable aux UV adhérant à chaque partie de bord, le produit d'étanchéité durcissable aux UV formant un revêtement comprenant un cordon imperméable, continu et uniforme, sur ladite surface de support de nappe de fibres et la surface de roulement, ledit cordon s'étendant à travers les interstices du tissu de base (12), stabilisant ainsi les fils (14, 16) dans les parties de bord du tissu de base (12) et protégeant les parties de bord contre l'usure.
    caractérisée en ce que le produit d'étanchéité durcissable aux UV comprend ou est constitué d'un matériau acrylique.
  2. Toile (10) selon la revendication 1,
    caractérisée en ce que la toile (10) est une toile sécheuse (10) adaptée pour traverser au moins une partie d'une section de séchage de la machine à nappe de fibres.
  3. Toile (10) selon la revendication 2,
    caractérisé en ce que la toile sécheuse (10) est adaptée pour une utilisation de la section de séchage à une température de 90 à 180 °C et/ou à une pression de vapeur allant jusqu'à 9 bar et/ou à une vitesse de machine allant jusqu'à 2 000 m/min.
  4. Toile (10) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que le tissu de base (12) est un tissu tissé.
  5. Toile (10) selon l'une quelconque des revendications 1 à 3,
    caractérisée en ce que le tissu de base (12) est un tissu spiral.
  6. Toile (10) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que les cordons imperméables ont une largeur (w) inférieure ou égale à 50 mm, de préférence une largeur comprise entre 20 mm et 45 mm.
  7. Toile (10) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que l'épaisseur maximale des cordons imperméables ne dépasse pas l'épaisseur maximale du tissu de base (12) de plus de 20 %.
  8. Toile (10) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que les cordons imperméables présentent chacun une surface de support de nappe de fibres sensiblement plane et/ou présentent une surface de roulement opposée sensiblement plate.
  9. Toile (10) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que le produit d'étanchéité durcissable aux UV présente une viscosité de 2 800 mPa.s à 6 500 mPa.s avant durcissement.
  10. Toile (10) selon l'une quelconque des revendications précédentes,
    caractérisée en ce que le produit d'étanchéité durcissable aux UV comprend au moins l'un des composants suivants :
    - N,N-diméthylacrylamide ;
    - ester 2-hydroxyéthylique d'acide 2-propénoïque, polymère avec le 5-isocyanato-1-(isocyanatométhyl)-1,3,3-triméthylcyclohexane ;
    - acrylate d'isobornyle ;
    - acrylate de 2-(2-éthoxyéthoxy)éthyle ;
    - oxyde de diphényl(2,4,6-triméthylbenzoyl)phosphine ;
    - [3-(2,3-époxypropoxy)propyl]triméthoxysilane ;
    - acide acrylique ;
    - acrylate de 2-hydroxyéthyle,
    dans laquelle, de préférence, aucun desdits composants ne représente plus de 50 % en poids par rapport à la composition du produit d'étanchéité durcissable aux UV.
  11. Procédé de fabrication d'une toile de machine à nappe de fibres (10) selon l'une quelconque des revendications précédentes, le procédé comprenant les étapes suivantes :
    a) fourniture d'un tissu de base perméable (12) qui est essentiellement constitué de fils, le tissu de base (12) comportant une surface de support de nappe de fibres et une surface de roulement opposée, ainsi que deux bords latéraux opposés (18) ;
    b) revêtement, par un système de distribution (22), des parties de bord du tissu de base (18) avec un produit d'étanchéité durcissable aux UV qui comprend ou est constitué d'un matériau acrylique ;
    c) durcissement du produit d'étanchéité durcissable aux UV par exposition à une source UV (24) afin de former une paire de bandes d'étanchéité de bord continues (20).
  12. Procédé selon la revendication 11,
    caractérisé en ce que la distance entre la position où le produit d'étanchéité durcissable aux UV est appliqué sur les bords et la position où le produit d'étanchéité durcissable aux UV est appliqué est durci est inférieure ou égale à 200 cm, de préférence est comprise entre 90 cm et 120 cm.
  13. Procédé selon la revendication 11 ou 12,
    caractérisé en ce que, pendant l'étape de revêtement b) et l'étape de durcissement c), le tissu de base se déplace à une vitesse de traitement comprise entre 8 m/min et 12 m/min par rapport au système de distribution (22) et/ou à la source UV (24).
  14. Procédé selon l'une quelconque des revendications 11 à 13,
    caractérisé en ce que, lors de l'étape de revêtement b), le produit d'étanchéité durcissable aux UV sort du système de distribution (22) à une pression comprise entre 2,5 bar et 6,5 bar et/ou un débit compris entre 250 g/min et 950 g/min.
  15. Procédé selon l'une quelconque des revendications 11 à 14,
    caractérisé en ce que l'intensité UV de la source UV pour le durcissement du produit d'étanchéité durcissable aux UV est inférieure ou égale à 250 mW/cm2, de préférence comprise entre 40 mW/cm2 et 100 mW/cm2.
EP23159843.4A 2023-03-03 2023-03-03 Habillage de machine à bande fibreuse avec joints de bord et son procédé de production Active EP4424909B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP23159843.4A EP4424909B1 (fr) 2023-03-03 2023-03-03 Habillage de machine à bande fibreuse avec joints de bord et son procédé de production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP23159843.4A EP4424909B1 (fr) 2023-03-03 2023-03-03 Habillage de machine à bande fibreuse avec joints de bord et son procédé de production

Publications (2)

Publication Number Publication Date
EP4424909A1 EP4424909A1 (fr) 2024-09-04
EP4424909B1 true EP4424909B1 (fr) 2025-09-17

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Country Status (1)

Country Link
EP (1) EP4424909B1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5059283A (en) * 1990-04-12 1991-10-22 The Procter & Gamble Company Process for solvent delivery of chemical compounds to papermaking belts
US5731059A (en) * 1993-04-07 1998-03-24 Wangner Systems Corporation Dryer fabric having an abrasion resistant edge
US5506033A (en) 1993-04-07 1996-04-09 Wangner Systems Corporation Dryer fabric edge seal

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