WO2022089851A1 - Liaison de bande et tissu de machine à papier - Google Patents

Liaison de bande et tissu de machine à papier Download PDF

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Publication number
WO2022089851A1
WO2022089851A1 PCT/EP2021/076252 EP2021076252W WO2022089851A1 WO 2022089851 A1 WO2022089851 A1 WO 2022089851A1 EP 2021076252 W EP2021076252 W EP 2021076252W WO 2022089851 A1 WO2022089851 A1 WO 2022089851A1
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WO
WIPO (PCT)
Prior art keywords
fabric
connection
connecting elements
longitudinal thread
thread ends
Prior art date
Application number
PCT/EP2021/076252
Other languages
German (de)
English (en)
Inventor
Torsten Wich
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
Publication of WO2022089851A1 publication Critical patent/WO2022089851A1/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
    • D21F1/0027—Screen-cloths
    • D21F1/0054—Seams thereof
    • 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
    • D21F7/10—Seams thereof

Definitions

  • the invention relates to a fabric connection and a covering for a machine for producing or processing a fibrous web
  • Clothings in particular clothings for paper machines, often comprise one or more fabric belts as a component.
  • Endless fabric tapes so-called tape loops, are usually required for use in a covering. These can either be woven directly as a ribbon loop ("circular woven") or they can be woven as a flat piece of fabric which is made endless by connecting the two longitudinal ends.
  • US 2014/0186579 describes the connection of two ends by means of an ultrasonic weld seam.
  • this type of connection is disadvantageous.
  • the fabric suffers during the welding process.
  • the properties of the joint after welding are not readily predictable.
  • the strength properties of the welded filaments also suffer. This is particularly disadvantageous since adequate tensile strength, particularly in the machine direction, is an important quality feature of the base fabric and of the finished covering.
  • welds are also comparatively brittle.
  • an element is transparent to light, e.g.
  • an element has an upper side or a lower side, this should be the case for circular elements be understood that the semicircle above a center line is understood as the upper side, and the semicircle below is understood as the lower side.
  • a fabric connection for a clothing of a machine for the production or processing of a fibrous web comprising a first fabric end with first longitudinal thread ends and a second fabric end with second longitudinal thread ends, as well as at least one connecting element that extends in the transverse direction of the subsequent clothing .
  • the invention provides that the connecting element has an upper side and a lower side, and the first longitudinal thread ends and the second longitudinal thread ends are in contact exclusively with the upper side of the connecting element and are cohesively connected to it, in particular welded.
  • a longitudinal thread end only touches the top of the connecting element should also be considered to be fulfilled if a small part of the longitudinal thread end touches a connecting element outside the top, for example as a result of a melting process during welding.
  • the machine can in particular be a paper machine (or board machine, tissue machine) or a pulp machine.
  • the integral connection takes place by means of transmission welding, in particular laser transmission welding.
  • This method is advantageous in the area of clothing for paper and pulp machines, among other things, because these clothings often consist entirely or partially of polyamides, and polyamides are largely transparent, for example in the NIR wavelength range.
  • the welding can be carried out very easily by inserting completely or partially absorbent connection elements. Besides, they won't absorbent parts of the covering are not or only slightly affected by the welding process.
  • connecting elements in particular two or three connecting elements.
  • the first and second longitudinal thread ends can each be in contact exclusively with the upper side of the connecting elements and can be cohesively connected to them, in particular welded.
  • This is advantageous in particular when using a plurality of connecting elements in order to produce longitudinal thread ends of sufficient length.
  • the connecting elements can extend over a plurality of longitudinal thread ends of a fabric end.
  • the connecting elements will extend across the entire width of the fabric in the transverse direction.
  • At least one connecting element is designed as a thread.
  • the thread or threads can in particular have a circular, oval or rectangular cross section.
  • threads with other cross sections are also possible.
  • the cross section for example “X”-shaped, “Y”-shaped or wedge-shaped, you can change the compressibility and elasticity even with threads made of a single material.
  • connecting elements are not designed as a thread.
  • the diameter of the at least one connecting element is larger, in particular more than 10%, preferably more than 30% larger, than the diameter of the woven transverse threads of the first fabric end and the second fabric end.
  • the distance between two adjacent connecting elements can be greater, in particular more than 10%, preferably more than 20%, than the distance between adjacent transverse threads of the first fabric end and the second fabric end.
  • the joining, in particular welding, of fabric ends can take place as described by removing transverse threads at the fabric ends with the formation of longitudinal thread ends protruding from the fabric ends, providing transverse threads and subsequently arranging the longitudinal thread ends over the provided transverse threads.
  • An obvious embodiment would be to remove the same number of transverse threads from both fabric ends (e.g. 3 pieces) and to provide the same number (3 pieces) of connecting elements, in particular thread-like connecting elements in the overlapping area of the longitudinal threads, ideally at almost the same distance as the das Full fabric specifies.
  • transverse threads with the same diameter as the transverse threads in the fabric for the connecting elements provided. If a transmission welding method is used for the connection, the inserted/provided transverse threads can also be designed in such a way that they sufficiently absorb the light of the wavelength that is used for the welding.
  • connecting elements with a larger diameter compared to transverse threads in the full fabric of the fabric ends lead to more stable welded connections, which is due to the fact that the contact pressure applied when welding the fabric ends presses the longitudinal and transverse threads together better in the connection area and generally larger ones Contact surfaces are generated at the thread connections. Thanks to simultaneous pressing and welding, however, fabric connections with only minimal deviations in thickness compared to full fabric are obtained.
  • connection zone was comparable and largely identical to the thickness of the full fabric.
  • a larger diameter of the connecting elements can also be advantageous if the fabric is to have a high storage volume and is therefore designed as a 1, 5-layer or 2-layer fabric.
  • the cross-directional yarns can be so close together that they are slightly shifted up and down, resulting in a thicker and bulkier fabric. If threads with the same diameter as the transverse threads of the fabric were used as the connecting element - which is possible in principle - the fabric seam would be thinner than the rest of the fabric. This could result in unwanted markings on the paper.
  • the thickness of the fabric and fabric seam can be matched.
  • threads of a different type are used for the connecting elements than for the transverse threads of the fabric.
  • threads are used for the transverse threads of the full fabric and monofilaments for the connecting elements.
  • threads of the type 2.times.2.times.0.2 mm are used for the transverse threads of the full fabric (2 filaments with a diameter of 0.2 mm are twisted together, and then two of the threads thus produced are twisted together again).
  • Monofilaments with a diameter of 0.4 mm can be used for the connecting elements. In addition to this described example, however, a large number of other combinations are also possible.
  • the connecting elements are designed to absorb light of a wavelength in the range between 780 ⁇ m and 1200 ⁇ m, at least on their respective upper side.
  • connection area all longitudinal thread ends and all connection elements are ideally welded together at all contact points
  • Both effects have an advantageous effect, for example, when needling the base fabric layers with fleece fiber layers of a press felt.
  • fiber transport is usually inhibited during needling.
  • areas of the press felt are obtained which, after needling, have a higher permeability compared to needled areas in the full fabric. Fewer fibers are needled into the fabric layer, non-woven fibers on the paper side are sometimes transported to neighboring areas during the needling process, or lead to thick areas due to concentration above the fabric layers.
  • the connecting elements are deformable, in particular elastically deformable.
  • connecting elements comprising an elastomer, in particular a polyurethane.
  • the connecting elements can be made of a uniform material or be made up of different materials. So-called core-sheath threads, among others, can be used as connecting elements, with the core and the sheath being made of different materials. It is possible here, for example, for the connecting elements to have a core made of polyurethane, which is surrounded by a jacket made of polymer material, the jacket being designed to absorb light of a wavelength in the range between 780 ⁇ m and 1200 ⁇ m.
  • the jacket should be thick enough to prevent the core material from being bare during or after welding. On the other hand, it should be thick enough so that the soft or elastic core is still able to compress and expand again when the thread is loaded.
  • top-bottom elements or “top-bottom” threads used as connecting elements.
  • Such a thread has an absorbent upper side and an underside that has good elastic properties.
  • an underside made of TPU (thermoplastic polyurethane) and a top side made of a polyamide, for example a PA6, to which an absorber additive is added.
  • Industrial soot (“carbon black”) is very well suited as an absorber additive.
  • a clothing for a machine for producing or processing a fibrous web is disclosed with a paper side in contact with the web and a running side facing away from the web, the clothing comprising at least a first fabric layer which has at least one fabric connection according to one aspect of the invention described above.
  • the problem is solved by a clothing for a machine for producing or processing a fibrous web with a paper side in contact with the web and a running side facing away from the web, the clothing having at least one first fabric layer.
  • the invention provides that the first fabric layer has at least one fabric connection according to one aspect of the invention described above, the fabric connection being arranged such that the underside of the at least one connecting element is directed towards the running side of the clothing.
  • a fabric layer of a covering according to an aspect of the present invention can consist, for example, of a piece of fabric which is made endless by a single fabric connection.
  • the tissue connection then joins the two tissue ends of the same piece of tissue together.
  • This piece of fabric can have the same fabric properties (e.g. weaving pattern, thread thickness, thread density) over its entire extent. But it is also possible that a property, e.g. the weave pattern, changes across the piece of fabric. For example, the weaving pattern can change along the longitudinal direction of the piece of fabric.
  • the first fabric layer has a plurality of fabric connections that are constructed according to one of the aspects described above, with all fabric connections being arranged in particular in such a way that the underside of the respective connection elements is directed towards the running side of the clothing.
  • the tissue connections then connect the tissue ends of different tissue pieces together.
  • the individual pieces of fabric can either be identical or differ in one or more properties.
  • the individual pieces of fabric themselves can either have the same fabric properties (e.g. weaving pattern, thread thickness, thread count) over their entire extent.
  • a property e.g. the weaving pattern, changes over the piece of fabric.
  • the covering has one or more further fabric layers, which can also have one or more fabric connections, in particular according to one of the aspects described above.
  • the first fabric layer is preferably arranged closer to the paper side of the clothing than the other fabric layers.
  • the covering has at least one additional fabric layer, the additional fabric layer being a circularly woven fabric layer.
  • the fabric can be a press felt, in which the paper side of the fabric is provided by a fleece layer that is connected to the fabric layer or layers by needling.
  • a press felt can be designed as a seam felt or as an endless felt.
  • Fabric connection for a covering of a machine for the production or processing of a fibrous web comprising a first fabric end with first longitudinal thread ends and a second fabric end with second longitudinal thread ends, and at least one connecting element which extends in the transverse direction of the later covering, characterized in that the connecting element has an upper side and has an underside, and the first longitudinal thread ends and the second longitudinal thread ends are in contact exclusively with the upper side of the connecting element and are cohesively connected to it, in particular welded.
  • Sentence 2 Tissue connection according to one of the preceding sentences, characterized in that a plurality of connecting elements, in particular two or three connecting elements, are provided, and the first longitudinal thread ends and second longitudinal thread ends are each in contact exclusively with the upper side of the connecting elements and are connected to them with a material bond, in particular are welded.
  • Tissue connection according to one of the preceding sentences characterized in that one or more transverse threads, in particular 2 -5 transverse threads, are removed from the first fabric end and/or the second fabric end to produce the first longitudinal thread ends and/or the second longitudinal thread ends.
  • Tissue connection according to one of the preceding sentences characterized in that at least one connecting element, preferably all connecting elements, is designed as a thread.
  • Set 5 Tissue connection according to Set 4, characterized in that the thread has a circular, oval or rectangular cross-section.
  • Tissue connection according to one of the preceding sentences characterized in that the diameter of the at least one connecting element is larger, in particular more than 10%, preferably more than 30% larger than the diameter of the woven transverse threads of the first fabric end and the second fabric end.
  • Sentence 7 Fabric connection according to one of sentences 2 to 6, characterized in that the distance between two adjacent connecting elements is greater, in particular more than 10%, preferably more than 20% greater than the distance between adjacent transverse threads of the first fabric end and the second fabric end.
  • Sentence 8 Tissue connection according to one of the preceding sentences, characterized in that the connecting elements are designed to absorb light of a wavelength in the range between 780 pm and 1200 pm at least on their respective upper side.
  • Sentence 9 Tissue connection according to one of the preceding sentences, characterized in that the connecting elements are deformable, in particular elastically deformable.
  • Sentence 10 Fabric connection according to one of the preceding sentences, characterized in that the connecting elements comprise an elastomer, in particular a polyurethane.
  • Tissue connection according to one of the preceding sentences, characterized in that the connecting elements have a core made of a polyurethane which is surrounded by a jacket made of polymer material, the jacket being designed to absorb light of a wavelength in the range between 780 pm and 1200 pm.
  • Sentence 12 Clothing for a machine for producing or processing a fibrous web with a paper side in contact with the web and a running side facing away from the web, the clothing having at least one first fabric layer, characterized in that the first fabric layer has at least one fabric connection according to one of the previous sentences, the Tissue connection can be arranged in particular so that the underside of the at least one connecting element is directed towards the running side of the clothing. (In principle, other arrangements are also possible, see, for example, FIG. 7e).
  • Clause 13 Clothing according to Clause 12, characterized in that the first fabric layer has a plurality of fabric connections according to one of clauses 1 to 11, all fabric connections being arranged in such a way that the underside of the respective connecting elements is directed towards the running side of the clothing.
  • Sentence 14 Covering according to one of sentences 12 to 13, characterized in that the covering has one or more further fabric layers which also have a fabric connection, in particular according to one of sentences 1 to 11, the first fabric layer being closer to the paper side of the covering is arranged than the other layers of fabric.
  • Set 15 Covering according to one of sets 12 to 14, characterized in that the cover has at least one additional fabric layer, the additional fabric layer being a round-woven fabric layer
  • FIGS. 1a and 1b illustrate a tissue connection according to one aspect of the present invention.
  • FIG. 2 shows a tissue connection according to a further aspect of the invention.
  • FIGS. 3a to 3d show possible connecting elements according to various aspects of the invention in cross section.
  • FIG. 4 shows further possible cross sections for connecting elements according to various aspects of the invention.
  • FIG. 5 shows a fabric according to a further aspect of the invention.
  • FIGS. 6a and 6b each show a fabric according to a further aspect of the invention
  • FIGS. 7a to 7e show a possible production process for a woven basic structure for a covering according to one aspect of the present invention.
  • FIG. 1a shows a first fabric end 2a and a second fabric end 2b, which are to be connected by means of a fabric connection 1.
  • FIG. 1a can be two ends of a single piece of fabric, which is made endless by the fabric connection. But it can also be tissue ends 2a, 2b of two different pieces of tissue that are joined by the tissue connection 1.
  • the first fabric end 2a has first longitudinal thread ends 3a and the second fabric end 2b has second longitudinal thread ends 3b.
  • longitudinal thread ends 3a, 3b of sufficient length for the fabric connection 1
  • some transverse threads 6 of the full fabric were removed from both fabric ends 2a, 2b. It is often advantageous if between two and five transverse threads 6 are removed per fabric end 2a, 2b.
  • FIG. 1b shows how the two fabric ends 2a, 2b from FIG. 1a are brought together.
  • three connecting elements 4 are provided in the form of connecting threads 4, which run in the transverse direction of the subsequent covering.
  • the connecting elements 4 have a top 4a and a bottom.
  • the first longitudinal thread ends 3a and the second longitudinal thread ends 3b are arranged in such a way that they are only in contact with the upper sides 4a of the connecting elements 4.
  • the connecting elements 4 and 4 are connected to the upper sides 4a of the connecting elements 4 in a materially bonded manner.
  • the integral connection can advantageously be produced by welding, in particular by (laser) transmission welding. If the longitudinal thread ends 3a, 3b are made of a polyamide, as is usual in many fabrics, they are completely or largely transparent to light in the NIR range.
  • the connecting elements 4 is designed to absorb light from this area - for example by adding a suitable absorber additive such as carbon black - then suitable NIR laser light can be used to shine through the longitudinal thread ends 3a, 3b and heat the absorbing upper sides 4a of the connecting elements 4 up and weld to the longitudinal thread ends 3a, 3b.
  • suitable absorber additive such as carbon black
  • suitable NIR laser light can be used to shine through the longitudinal thread ends 3a, 3b and heat the absorbing upper sides 4a of the connecting elements 4 up and weld to the longitudinal thread ends 3a, 3b.
  • the process is usually carried out by applying a certain joining pressure.
  • the integral connection can also be realized, for example, by other welding processes such as ultrasonic welding or adhesive connections.
  • the fabric connection 1 shown in FIG. 2 is a special embodiment of the fabric connection 1 from FIG. 1b.
  • the connecting elements 4 are designed in the form of connecting threads 4, which have a larger diameter compared to transverse threads 6 in the solid fabric of the fabric ends 2a, 2b. This leads to more stable welds, which is due to the fact that the contact pressure applied when welding the tissue ends 2a, 2b, the longitudinal thread ends 3a, 3b and Connecting elements 4 pressed together better in the connection area and generally larger contact surfaces are generated at the thread connections. Simultaneous pressing and welding nevertheless produces fabric connections 1 with only minimal deviations in thickness compared to full fabric.
  • connection zone 1 was comparable in both cases and largely identical to the thickness of the full fabric.
  • Another example is a 1.5-ply or 2-ply fabric where, for example, the cross-directional yarns are so close together that they are slightly shifted up and down, resulting in a thicker and bulkier fabric.
  • the fabric itself can have a thickness of 1.2 mm.
  • the diameters given are only to be understood as exemplary possible values. However, the invention is not limited to these values). If threads with a diameter of 0.4 mm were also used here as connecting elements 4, the thickness of the fabric connection would be significantly smaller at approximately 0.8 mm than that of the rest of the fabric. This can lead, among other things, to undesired markings in the paper produced.
  • a solution here can also be the use of thicker connecting elements 4 .
  • the same thickness results for the fabric connection as for the fabric.
  • the diameter of the connecting elements 6 can even be slightly larger (eg 10% or 20%).
  • tissue connections 1 are again obtained with only minimal deviations in thickness compared to the full tissue.
  • the connecting elements 4 were used at a distance that is greater than the distance between the transverse threads 6 in the solid fabric of the fabric ends 2a, 2b.
  • the longitudinal thread ends 3a, 3b four transverse threads 6 were used here as an example at the fabric ends 2a, 2b, but only 3 transverse threads were used as connecting elements 4 for the fabric connection 4.
  • somewhat more open fabric connections 1 are obtained after the connection, which have a reduced material density.
  • connection area 1 all longitudinal thread ends 3a, 3b and all connection elements 4 are ideally welded to one another at all contact points
  • Both effects have an advantageous effect, for example, when needling the base fabric layers with fleece fiber layers of a press felt.
  • the connecting elements 4 are designed to be absorbent at least on their upper side 4a.
  • the entire connecting element can be designed to be absorbent by means of an absorber additive.
  • Figure 3a shows a classic core Sheath Thread in which only the sheath 8 is absorbent, while there is relatively great freedom in the design of the core 7.
  • This core can again be made of a polyamide, for example. But it is also possible to use the core 7 from other materials, e.g. B to manufacture an elastomeric polyurethane. The resulting increased elastic properties of the connecting element 4 can prove to be advantageous.
  • Figures 3b, 3c and 3d show variants of these connecting elements 4 made of mixed materials.
  • Half-and-half threads 4 can be seen in FIGS. 3b and 3c—one with a round cross section and one with a rectangular cross section.
  • the upper part e.g. the upper half
  • the lower part is made of non-absorbent core material 7.
  • FIG. 3d shows a variant of FIG. 3c.
  • a rectangular connecting element 4 only the surface of the upper side 4a is made of absorbent material 8. This can be applied to the connecting element before welding, for example. Suitable materials are commercially available, for example, under the name "Clearweld”.
  • the connecting elements 4 shown here are only intended to show the variety of possibilities. The invention is not limited to these examples.
  • FIG. 4 shows further possible cross sections for connecting elements 4 according to various aspects of the invention.
  • a suitable shape for example in the form of an “X”, a “Y” or a wedge
  • the compressibility and elasticity can be changed even with threads made of a single material.
  • the contact surface of the connecting elements with the longitudinal thread ends can be increased without creating too high a material density in the fabric connection.
  • connecting elements 4 shaped in this way as shown in FIG.
  • FIG. 5 shows a covering 10 according to a further aspect of the invention.
  • the covering 10 is designed as a press felt. It comprises a fleece layer 13 which makes the paper side 11 of the covering 10 available.
  • the fleece layer 13 is arranged on a first fabric layer 14 and fixed, for example, by needling.
  • the first fabric layer 14 has a fabric connection 1 which connects a first fabric end 2a with first longitudinal thread ends 3a and a second fabric end 2b with second longitudinal thread ends 3b to one another.
  • three connecting elements 4 are provided in the covering 10 of FIG. 5, which extend in the transverse direction of the covering 10 .
  • the connecting elements 4 are connected, in particular welded, to the first longitudinal thread ends 3a and the second longitudinal thread ends 3b exclusively with their upper side 5 in a materially bonded manner.
  • the fabric connection 1 is arranged in such a way that the underside 5b of the connecting elements 4 is directed in the direction of the running side 12 of the clothing 10 .
  • This arrangement of the fabric connection 1 influences the tendency of the press felt 10 to mark.
  • the longitudinal thread ends 3a, 3b which may overlap, point to the paper side 13 and the transversely arranged threads of the connecting elements 4 point to the running side 12.
  • the relatively densely packed longitudinal threads 3a, 3b (approx. twice the thread density in the connecting area 1) result in possible mechanical markings starting from the connecting elements 4 minimized. This is all the more important since, in advantageous embodiments, the transverse threads of the connecting elements 4 are at a greater distance from one another than the transverse threads 6 in the solid fabric.
  • FIGS. 6a and 6b also show examples of coverings 10 according to further aspects of the present invention.
  • the clothings 10 shown here each have a further fabric layer 15 in addition to the first fabric layer 14, the first fabric layer 14 being closer to the paper side 11 of the covering 10 is arranged than the further fabric layers 15.
  • the further fabric layers 15 also have at least one fabric connection 1 according to one aspect of the present idea. In the case of the coverings 10 shown in FIGS. 6a and 6b, these fabric connections 1 are arranged essentially one above the other.
  • the fabric connections 1 of the first fabric layer 14 and the fabric connections 1 of the further fabric layer 15 are not arranged directly one above the other, but are offset from one another in the machine longitudinal direction (MD), and for example an MD distance of more than 10 cm or more than 100 cm.
  • the difference between Figure 6a and Figure 6b is the orientation of the fabric connection 1 in the further fabric layer 15.
  • the fabric connection 1 is oriented in the same way as that of the first fabric layer 14.
  • the longitudinal thread ends 3a, 3b point to the Paper side 13 and the transversely arranged threads of the connecting elements 4 point to the running side 12.
  • the fabric connection 1 is oriented the other way around.
  • Such an arrangement of the fabric connections 1 can in some cases be favorable in terms of production technology.
  • the fabric connection 1 of the further fabric layer 15 can be closed simply by transmission welding, in that the connection area is irradiated from the underside with e.g. laser light.
  • FIGS. 7a to 7e show a possible production process for a woven basic structure for a covering 10, in particular for a covering 10 according to one aspect of the present invention.
  • a piece of fabric is folded at two folding points 20 and placed on itself in such a way that the two fabric ends 2a, 2b touch or overlap (FIGS. 7a and 7b).
  • the two fabric ends 2a, 2b are then connected to one another by a fabric connection 1.
  • the longitudinal thread ends 3a, 3b are usually cohesively connected to one another via one or more connecting elements 4.
  • the connecting elements 4 extend, for example, in the form of threads in the transverse direction of the covering 10.
  • connection is made in such a way that the longitudinal thread ends 3a, 3b are only in contact with the upper side of the connecting element 4 or the connecting elements 4, and are firmly bonded to this. are in particular welded.
  • a number of transverse threads 6 can be removed from the fabric ends 2a, 2b in order to lengthen the longitudinal thread ends 3a, 3b.
  • the fabric connection 1 is advantageously aligned in such a way that the underside 5b of the at least one connection element 4 points in the direction of the interior of the two-layer fabric being produced.
  • the material-to-material connections can be easily implemented using transmission welding.
  • seam loops 21 are formed at the folds 20.
  • a certain number of transverse threads 6 are removed from the fabric at these points. This removal often takes place before the fabric 10 is folded and placed on top of one another.
  • the two-layer fabric can be sewn together by bringing the seam loops together
  • FIGS. 7d and 7e are available.
  • the seam loops 21 have been brought together in such a way that the fabric connection 1 is arranged in the position closer to the paper side 11. It turns out that the fabric connection 1 is arranged so that the underside 5b of the at least one connecting element 4 is directed in the direction of the running side 12 of the clothing 10.
  • Such a fabric loop as in FIG. 7d can thus also be used as the first fabric layer 14 in a covering 10 according to one aspect of the invention.
  • FIG. 7e An alternative is shown in FIG. 7e.
  • the seam loops 21 have been brought together in such a way that the fabric connection 1 is arranged in the position closer to the running side 12 .
  • the result is that the fabric connection 1 is arranged in such a way that the underside 5b of the at least one connecting element 4 is directed in the direction of the paper side 11 of the covering 10 .
  • tissue loop as in

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Abstract

L'invention concerne une liaison de bande pour un tissu d'une machine de production ou de traitement d'une bande de matière fibreuse, comprenant une première extrémité de bande ayant des premières extrémités de fil longitudinales, une seconde extrémité de bande ayant des secondes extrémités de fil longitudinales, et au moins un élément de liaison qui s'étend dans le sens transversal du tissu suivant. L'invention est caractérisée en ce que l'élément de liaison présente une face supérieure et une face inférieure, et les premières extrémités de fil longitudinales et les secondes extrémités de fil longitudinales viennent en contact uniquement avec la face supérieure de l'élément de liaison (4) et y sont liées, en particulier les extrémités de fil sont soudées à celle-ci. L'invention porte également sur un tissu comprenant ladite liaison de bande.
PCT/EP2021/076252 2020-10-28 2021-09-23 Liaison de bande et tissu de machine à papier WO2022089851A1 (fr)

Applications Claiming Priority (4)

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US202063106630P 2020-10-28 2020-10-28
US63/106,630 2020-10-28
DE102020132394.8 2020-12-07
DE102020132394 2020-12-07

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7381307B2 (en) 2002-12-18 2008-06-03 Tamfelt Oyj Abp Method of manufacturing a press felt, and a press felt, with the shape of a closed loop
US20140186579A1 (en) 2012-12-28 2014-07-03 Albany International Corp. Industrial fabric and method of welding seam area using ultrasonic welding
DE102017127000A1 (de) * 2017-09-27 2019-03-28 Voith Patent Gmbh Bespannung
DE102018105956A1 (de) * 2018-03-15 2019-09-19 Voith Patent Gmbh Bespannung

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7381307B2 (en) 2002-12-18 2008-06-03 Tamfelt Oyj Abp Method of manufacturing a press felt, and a press felt, with the shape of a closed loop
US20140186579A1 (en) 2012-12-28 2014-07-03 Albany International Corp. Industrial fabric and method of welding seam area using ultrasonic welding
DE102017127000A1 (de) * 2017-09-27 2019-03-28 Voith Patent Gmbh Bespannung
DE102018105956A1 (de) * 2018-03-15 2019-09-19 Voith Patent Gmbh Bespannung

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