EP3688221B1 - Revêtement et procédé pour le fabriquer ainsi que non-tissé - Google Patents

Revêtement et procédé pour le fabriquer ainsi que non-tissé Download PDF

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Publication number
EP3688221B1
EP3688221B1 EP18773379.5A EP18773379A EP3688221B1 EP 3688221 B1 EP3688221 B1 EP 3688221B1 EP 18773379 A EP18773379 A EP 18773379A EP 3688221 B1 EP3688221 B1 EP 3688221B1
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EP
European Patent Office
Prior art keywords
nonwoven
fabric
fibers
weight
fibres
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EP18773379.5A
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German (de)
English (en)
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EP3688221A1 (fr
EP3688221C0 (fr
Inventor
Robert Eberhardt
Susanne Klaschka
Hubert Walkenhaus
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Voith Patent GmbH
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Voith Patent GmbH
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Publication of EP3688221B1 publication Critical patent/EP3688221B1/fr
Publication of EP3688221C0 publication Critical patent/EP3688221C0/fr
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Classifications

    • 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
    • D21F7/083—Multi-layer felts
    • 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
    • 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 covering according to the preamble of claim 1 and a method for producing a covering according to the preamble of claim 15.
  • the invention further relates to a fiber fleece for use as a fleece layer in a covering according to the preamble of claim 14.
  • Such a covering is, for example out of WO 2016/071262 A1 known.
  • coverings When producing fibrous webs, especially paper, tissue, cardboard or cellulose webs, various technical textiles are used in the form of coverings. These coverings fulfill a variety of tasks, such as transporting the fibrous web, dewatering or structuring the web, to name just a few.
  • Press felts are usually used in the press section. These felts usually have a woven basic structure and one or more layers of nonwoven fibers. The materials used as well as the structure and arrangement of the individual layers are optimized for the intended use.
  • the fibers of the fleece layers are polymer fibers.
  • ultra-thin fleece layers are described, the fibers of which can consist of a variety of polymeric materials, in particular polyurethanes.
  • a fleece layer consists entirely or largely of fibers made of a thermoplastic polyurethane.
  • the task is solved by a covering for a machine for producing a fibrous web, in particular a paper, cardboard, tissue or cellulose web.
  • the covering includes a basic structure with a Top and one running side as well as a fleece layer on at least one side.
  • This non-woven layer has a functional zone which extends over more than 50 ⁇ m in the thickness direction of the covering and which comprises a first portion and a second portion of non-woven fibers, the non-woven fibers of the first portion being made of a polyurethane (PU), in particular a thermoplastic polyurethane ( TPU) consist or include this, while the nonwoven fibers of the second portion consist of a polymer material which does not include polyurethane.
  • PU polyurethane
  • TPU thermoplastic polyurethane
  • the first proportion makes up between 10% by weight and 60% by weight, preferably between 15% by weight and 50% by weight, particularly preferably between 20% by weight and 45% by weight of the functional zone.
  • nonwoven fibers of the first portion which consist of or include a polyurethane, are referred to as PU fibers.
  • Nonwoven fibers that consist of or include a thermoplastic polyurethane are referred to as TPU fibers.
  • TPU fibers are always also PU fibers.
  • nonwoven fibers made of polyurethane (PU) - an elastomer - and other polymer fibers represents in a certain sense an optimal compromise.
  • the PU fibers as such are very difficult to process. For example, carding the fibers in a carding machine is almost impossible.
  • Non-woven fibers made from other polymer materials are much easier to process here.
  • a functional zone of the type specified can be created, for example, by needling a fleece layer made of a mixture of PU fibers with fibers made of other polymers, such as a polyamide, with the basic structure and optionally further fleece layers.
  • fleece fibers from neighboring fleece layers can be mixed. However, if, for example, no fleece layer used has more than 60% (50%, 48% ...) PU fibers, it is ensured that the functional zone in the felt does not have more than 60% (50%, 48% %) Has PU fibers.
  • the proportion of PU fibers, especially TPU fibers, in the fleece layer results in a faster start-up of the covering. While, for example, press felts today usually require a few days before they are broken in, i.e. before they reach their final properties, coverings according to the invention can achieve these after just a few hours.
  • the effect of the PU fibers on the start-up behavior and re-humidification can also be adjusted via the thickness of the functional zone.
  • the basic structure can become compacted during startup, but this varies from structure to structure.
  • a greater thickness of the functional zone can be advantageous, especially for basic structures that compact more strongly at start-ups.
  • the functional zone extends over more than 100 ⁇ m, in particular over 200 ⁇ m, 300 ⁇ m, 500 ⁇ m or more.
  • the functional zone can have a thickness of less than 5 mm, in particular less than 3 mm.
  • a fleece layer is advantageously provided on the top and/or bottom of the basic structure.
  • the fleece layer on the top and/or the bottom has at least one functional zone.
  • a functional zone can be positioned anywhere within the fleece layer.
  • a functional zone can be arranged within a nonwoven overlay on the top in such a way that neither the surface that touches the fibrous web is available nor is it directly adjacent to the base structure. But this doesn't have to be the case. It can certainly be provided that the functional zone provides the surface that comes into contact with the fibrous web and/or is arranged in direct contact with the base structure.
  • a functional zone can be arranged within a fleece layer on the underside in such a way that neither the surface that touches the machine elements is available nor is it directly adjacent to the basic structure. But this doesn't have to be the case. It can certainly be provided that the functional zone provides the surface that comes into contact with the machine elements and/or is arranged in direct contact with the base structure.
  • proportion of PU fibers or TPU fibers in the functional zone does not become too low.
  • the nonwoven fibers of the second portion can consist wholly or partly of a polyamide, for example a PA 6 or PA 6.6, or include this.
  • a polyamide for example a PA 6 or PA 6.6, or include this.
  • the nonwoven fibers of the first portion i.e. the PU fibers or TPU fibers
  • nonwoven fibers with 22 dtex, 44 dtex or 67 dtex can be advantageous.
  • all PU fibers have the same fiber fineness.
  • the PU fibers of the first portion have different fiber finenesses.
  • the nonwoven fibers of the second portion have fiber finenesses between 10 dtex and 80 dtex, in particular between 20 dtex and 70 dtex.
  • Nonwoven fibers with 22 dtex, 44 dtex or 67 dtex can also be advantageous for the second portion.
  • the PU fibers all have the same fiber fineness or different fiber finenesses.
  • non-PU fibers of the second portion all have the same fiber fineness or different fiber finenesses.
  • the PU fibers of the first portion have the same fiber fineness as the fibers of the second portion.
  • the PU fibers of the first portion have different fiber finenesses than the fibers of the second portion.
  • a very advantageous example of this can be that the first portion has nonwoven fibers of a certain fiber fineness, while the second portion comprises nonwoven fibers with two or more fiber finenesses.
  • the second portion has nonwoven fibers of a certain fiber fineness, while the first portion comprises nonwoven fibers with two or more fiber finenesses.
  • the processability of the fleece can be improved through a combination of different fiber finenesses.
  • the PU fibers are all made of the same polyurethane or different polyurethanes. Furthermore, it can be advantageous if the non-PU fibers of the second portion are all made of the same polymer or of different polymers.
  • the PU fibers, or the PU material used, of the first portion have a hardness of 35 Shore D, 40 Shore D and more, in particular 50 Shore D and more.
  • the hardness of the PU fibers is too high, the advantages of the invention may be less apparent. It is therefore provided that at least some, in particular all, of the PU fibers - or the PU material used - of the first portion have a hardness of 85 Shore D or less, in particular of 80 Shore D or less.
  • a PU material or PU materials will be used which lie in a preferred hardness range between 35 Shore D and 85 Shore D.
  • a particularly preferred hardness range extends between 50 Shore D and 80 Shore D.
  • Shore hardness is a material parameter for elastomers and plastics and is specified in the standards DIN EN ISO 868 and DIN ISO 7619-1.
  • non-woven fibers of the first proportion are provided in the non-woven layer on one side.
  • the functional zone makes up the entire thickness of a nonwoven layer.
  • the functional zone only makes up part of the thickness of a fleece layer.
  • At least one further zone is provided in which the proportion of PU fibers is less than 10% by weight and this further zone is between the basic structure and the functional zone and/or between the functional zone and the surface of the covering is arranged.
  • a further zone can be provided on the top of the basic structure in which the proportion of PU fibers is less than 10%, followed by a functional zone with a proportion of between 10% and 60% of PU fibers, and a second further one Zone with less than 10% PU fibers.
  • This second zone represents in this For example, the surface of the covering that touches the fibrous web is also represented.
  • the functional zone represents the surface of the covering that comes into contact with the fibrous web.
  • the covering is a press felt.
  • the felt can be a seam felt.
  • the basic structure consists of or includes a circular woven basic structure
  • the basic structure comprises or consists of a flat fabric.
  • a basic structure can also include several layers of fabric, as well as combinations of round-woven and flat-woven structures.
  • the basic structure comprises a flat fabric which is narrower than the later basic structure or covering.
  • the desired width can then be achieved, for example, by spiraling.
  • the basic structures are not limited to woven basic structures. It can also be provided that the basic structure comprises or consists of a scrim. Such thread scrims can be constructed, for example, by spiraling one or more threads.
  • the task is solved by a fiber fleece for use in a covering for a machine for producing a Fibrous web which has a first portion and a second portion of nonwoven fibers, the nonwoven fibers of the first portion consisting of or comprising a polyurethane, in particular a thermoplastic polyurethane, and the nonwoven fibers of the second portion consisting of a polymer material which is not a polyurethane.
  • this first proportion makes up between 10% by weight and 60% by weight, preferably between 10% by weight and 50% by weight, particularly preferably between 20% by weight and 45% by weight of the fiber fleece.
  • the nonwoven fibers of the second portion consist of a polyamide, for example a PA 6 or a PA 6.6.
  • Such fiber fleeces are very advantageous to handle and can also be easily produced and processed on existing machines that are generally designed for PA fleece fibers.
  • the proportion of PA fibers can be dissolved using formic acid.
  • the PU fibers are retained.
  • the proportion of PU fibers and PA fibers can be easily determined.
  • additional fleece layers can also be needled to the basic structure.
  • These can in particular be fleece layers that do not have any PU fibers.
  • it can also be more act functional fleece layers, which again consist of a fiber fleece according to the invention made of PU fibers and non-PU fibers.
  • Figure 1 to Figure 4 each show a covering according to an aspect of the invention.
  • FIGS. 5a to 5c show a class of basic structures that can be used advantageously for the present invention.
  • Figure 5d shows a covering according to a further aspect of the invention, using a basic structure
  • Figure 6 shows another possible basic structure for a covering according to a further aspect of the invention.
  • Figure 1 shows schematically a section through a covering according to one aspect of the invention. It includes a basic structure 1, which in this embodiment is a woven basic structure 1.
  • the fabric can be single-layer or multi-layer.
  • a woven basic structure 1 can consist of or include a single fabric or several fabrics.
  • a fleece layer 2b is provided on the underside of the basic structure 1. This can be a conventional fleece layer with fleece fibers made of a polyamide.
  • This fleece layer 2b also provides the running side 11 of the covering
  • a further fleece layer 2a is provided on the top of the basic structure 1, a further fleece layer 2a is provided.
  • This fleece layer 2a includes a functional zone 3.
  • the thickness of the functional zone 3 is at least 100 ⁇ m, preferably more than 200 ⁇ m or more than 300 ⁇ m.
  • This functional zone 3 includes a first portion of PU fibers and a second portion of non-PU fibers.
  • the first proportion makes up between 10% by weight and 60% by weight, preferably between 10% by weight and 50% by weight, particularly preferably between 20% by weight and 45% by weight of the functional zone.
  • the upper fleece layer 2a can in principle have all types of fleece fibers outside the functional zone.
  • it can consist mainly of non-PU fibers.
  • the proportion of PU fibers outside the functional zone can be, for example, 10% by weight or less.
  • the upper fleece layer 2a also provides the surface 10 that touches the fibrous web.
  • the functional zone 3 is in the execution of the Figure 1 arranged in such a way that neither the surface 10 touching the fibrous web is available nor is it directly adjacent to the basic structure. But this doesn't have to be the case. It can certainly be provided that the functional zone 3 provides the surface 10 that comes into contact with the fibrous web and/or is arranged in direct contact with the base structure.
  • the covering shown differs from that in Figure 1 shown essentially in that the upper fleece layer 2a has two functional zones 3, 3a, each of which has PU fibers and non-PU fibers.
  • the proportion of PU fibers is between 10% by weight and 60% by weight, preferably between 10% by weight and 50% by weight, particularly preferably between 20% by weight and 45% by weight.
  • the proportion of PU fibers in the different functional zones 3, 3a is the same or different.
  • the material of the nonwoven fibers and/or the fiber fineness in the different functional zones 3, 3a is the same or different.
  • a functional zone 3a of the in Figure 2 The covering shown borders directly on the basic structure 1. In other embodiments, however, several functional zones 3, 3a can also be provided, none of which directly adjoins the basic structure 1.
  • the covering shown shows the difference Figure 1 and Figure 2 on the top there is a fleece layer 2a, which consists entirely of a functional zone consists.
  • the proportion of PU fibers is between 10% by weight and 60% by weight, preferably between 10% by weight and 50% by weight, particularly preferably between 20% by weight and 45% by weight at the top Fleece layer 2a.
  • the type of non-woven fibers, in particular the PU fibers can change over the thickness of the non-woven layer 2a.
  • Figure 4 shows a covering that differs from that in Figure 1 shown differs in that a further functional zone 3b is provided in the lower fleece layer 2b.
  • a functional zone 3b in the lower fleece layer 2b can be provided independently of the design of the upper fleece layer, for example also for coverings in Figure 2 or 3
  • the functional zone 3b can again be positioned anywhere within the lower fleece layer, i.e. also in direct contact with the basic structure 1 or in such a way that the running side 11 of the covering is available.
  • a fabric 100 in particular a flat-woven fabric 100, is used, which is essentially twice the length of the finished covering.
  • This fabric 100 has front edges 102, 103.
  • the fabric 100 is folded at folding points 106, 107 and the folded parts are placed back on the fabric 100.
  • the front edges 102, 103 can overlap, touch or, as in Figure 5c shown, have a small distance from each other.
  • the front edges 102, 103 can also be joined together in a suitable manner.
  • it can also be provided that the two layers are connected to one another. This can be done, for example, by seam connections1 10.
  • Seam loops 106a, 107a can be formed from the folds 106, 107, preferably by removing fabric threads in the cross machine direction (CD). These seam loops 106a, 107a can be brought together and joined together in a manner known to those skilled in the art using a pintle to form an endless structure.
  • Such a basic structure 1 can Now fleece pads 2a, 2b are applied and secured, for example, by needling.
  • Figure 5d shows an example of a basic structure 1, as in the Figures 5a to 5c shown, the basic structure 1 is an in Figure 1 the covering shown is used.
  • the basic structure 1 is made of a flat fabric 100, which is narrower than the later basic structure 1 or covering.
  • the required width of the basic structure 1 was achieved by spiralizing the flat fabric 100.
  • the flat fabric 100 has a width of between 50 cm and 2 m, in particular 100 cm.
  • the length L of the resulting loop is usually over 10m, often over 20m or 30m.
  • the edges of the fabric 100 of adjacent turns can be connected to one another, in particular also welded.
  • a loop, as in Figure 6 shown can be used directly as basic structure 1 for an endless covering.
  • the top t and/or the bottom b can also be provided with fleece layers.
  • this basic structure can also serve as a basic structure 1 for a seam felt.
  • loop 1 analogously to the Figures 5c and 5d essentially made in twice the length of the covering and placed on top of each other to form a flat, double-layered structure. This creates folds again, which serve as the basis for the seam loops of the seam connection, as described above.
  • Fleece layers 2a, 2b can now be applied to such a basic structure 1 and secured, for example, by needling.

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  • Nonwoven Fabrics (AREA)

Claims (15)

  1. Habillage pour une machine de fabrication d'une bande fibreuse, en particulier d'une bande de papier, de carton, de papier tissu ou de cellulose, comprenant une structure de base avec une face supérieure et une face de défilement ainsi que, sur au moins une face, une couche de non-tissé, cette couche de non-tissé présentant une zone fonctionnelle qui s'étend sur plus de 50 µm dans le sens de l'épaisseur de l'habillage et qui comprend une première fraction et une deuxième fraction de fibres de non-tissé, les fibres de non-tissé de la première fraction étant constituées d'un polyuréthane, en particulier un polyuréthane thermoplastique, tandis que les fibres non tissées de la deuxième partie sont constituées d'un matériau polymère qui ne comprend pas de polyuréthane, la première partie représentant entre 10 % et 60 % en poids, de préférence entre 15 % et 50 % en poids, de manière particulièrement préférée entre 20 % et 45 % en poids de la zone fonctionnelle, caractérisé en ce que le matériau PU utilisé des fibres non tissées de la première partie présente une dureté entre 35 Shore D et 85 Shore D, en particulier entre 50 Shore D et 80 Shore D.
  2. Entoilage selon la revendication 1, caractérisé en ce que la zone fonctionnelle s'étend dans le sens de l'épaisseur sur moins de 5mm, en particulier dans une plage comprise entre 100µm et 3mm.
  3. Entoilage selon l'une quelconque des revendications précédentes, caractérisé en ce que les fibres non tissées de la première fraction présentent des finesses de fibres comprises entre 30 dtex et 80 dtex, notamment entre 50 dtex et 70 dtex.
  4. Entoilage selon l'une quelconque des revendications précédentes, caractérisé en ce que les fibres non tissées de la deuxième partie présentent des finesses de fibres comprises entre 10 dtex et 80 dtex, notamment entre 20 dtex et 70 dtex.
  5. Entoilage selon l'une quelconque des revendications précédentes, caractérisé en ce que la première partie et/ou la deuxième partie comprennent des fibres non tissées ayant des finesses de fibres différentes.
  6. Entoilage selon l'une des revendications précédentes, caractérisé en ce que des fibres non tissées de la première proportion sont prévues dans la couche non tissée entre 15 g/m2 et 250 g/m2.
  7. Entoilage selon l'une des revendications précédentes, caractérisé en ce que des fibres non tissées de la deuxième proportion sont prévues dans la couche non tissée entre 100 g/m2 et 1500 g/m2.
  8. Entoilage selon l'un des précédents, caractérisé en ce qu'il est encore prévu au moins une autre zone dans laquelle la première proportion est inférieure à 10 % en poids et cette autre zone est disposée entre la structure de base et la zone fonctionnelle et/ou entre la zone fonctionnelle et la surface de l'entoilage.
  9. Entoilage selon l'une quelconque des revendications précédentes, caractérisé en ce que la zone fonctionnelle fournit la surface de l'entoilage.
  10. Entoilage selon l'une des revendications précédentes, caractérisé en ce que la couche de non-tissé est prévue sur le côté de la structure de base en contact avec la bande de fibres.
  11. Entoilage selon l'une quelconque des revendications précédentes, caractérisé en ce que la structure de base comprend ou est constituée d'un tissu plat.
  12. Entoilage selon la revendication 11, caractérisé en ce que pour la structure de base (1), on utilise un tissu plat (100) avec des bords frontaux (102, 103), qui présente essentiellement le double de la longueur de l'entoilage fini, le tissu à foule (100) étant plié en des points de pliage (106, 107), et les parties pliées sont à nouveau déposées sur le tissu plat (100) en formant une structure à deux couches, et dans lequel des boucles de couture (106a, 107a) sont formées à partir des points de pliage (106, 107), lesquelles peuvent être rassemblées de telle sorte que la structure de base peut être assemblée au moyen d'une pinte pour former une structure sans fin.
  13. Entoilage selon la revendication 11, caractérisé en ce que la structure de base (1) comprend un tissu plat (100) qui est plus étroit que la structure de base (1), la structure de base (1) étant obtenue par spiralisation du tissu plat (100).
  14. Non-tissé destiné à être utilisé dans un habillage pour une machine de fabrication d'une bande fibreuse, qui comprend une première partie et une deuxième partie de fibres non-tissées, les fibres non-tissées de la première partie étant constituées d'un polyuréthane, en particulier d'un polyuréthane thermoplastique, ou comprenant celui-ci, et les fibres non-tissées de la deuxième partie étant constituées d'un matériau polymère, qui n'est pas du polyuréthane, cette première partie représentant entre 10 % et 60 % en poids, de préférence entre 15 % et 50 % en poids, de manière particulièrement préférée entre 20 % et 45 % en poids du non-tissé, caractérisé en ce que le matériau PU utilisé des fibres de non-tissé de la première partie présente une dureté entre 35 Shore D et 85 Shore D, en particulier entre 50 Shore D et 80 Shore D.
  15. Les procédés de fabrication d'un entoilage, en particulier d'un entoilage selon l'une des revendications précédentes, comprennent les étapes de procédé suivantes :
    i) mise à disposition d'une structure de base
    ii) mise à disposition d'une couche fonctionnelle non tissée, qui est constituée d'une nappe de fibres selon la revendication 14.
    iii) Fixation de la couche fonctionnelle non tissée ainsi que d'éventuelles autres couches non tissées à la structure. sur la structure de base par aiguilletage
EP18773379.5A 2017-09-29 2018-09-13 Revêtement et procédé pour le fabriquer ainsi que non-tissé Active EP3688221B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102017122668.0A DE102017122668A1 (de) 2017-09-29 2017-09-29 Bespannung und Verfahren zu deren Herstellung sowie Faservlies
PCT/EP2018/074707 WO2019063302A1 (fr) 2017-09-29 2018-09-13 Revêtement et procédé pour le fabriquer ainsi que non-tissé

Publications (3)

Publication Number Publication Date
EP3688221A1 EP3688221A1 (fr) 2020-08-05
EP3688221B1 true EP3688221B1 (fr) 2023-11-15
EP3688221C0 EP3688221C0 (fr) 2023-11-15

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ID=63667879

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18773379.5A Active EP3688221B1 (fr) 2017-09-29 2018-09-13 Revêtement et procédé pour le fabriquer ainsi que non-tissé

Country Status (5)

Country Link
US (1) US11208764B2 (fr)
EP (1) EP3688221B1 (fr)
CN (1) CN111164260B (fr)
DE (1) DE102017122668A1 (fr)
WO (1) WO2019063302A1 (fr)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005023390A1 (de) * 2005-05-20 2006-11-23 Voith Patent Gmbh Papiermaschinenbespannung
DE102007000578A1 (de) 2007-10-26 2009-04-30 Voith Patent Gmbh Papiermaschinenbespannungen, insbesondere für Pressfilze, und Verfahren zu deren Herstellung
US8043477B2 (en) * 2008-02-25 2011-10-25 Voith Patent Gmbh Belt and method of making a belt for a paper making machine
DE102008040307A1 (de) * 2008-07-10 2010-01-14 Voith Patent Gmbh Band für eine Maschine zur Herstellung von Bahnmaterial
DE102009002433A1 (de) * 2009-04-16 2010-10-21 Voith Patent Gmbh Papiermaschinenbespannung
WO2016071262A1 (fr) * 2014-11-05 2016-05-12 Voith Patent Gmbh Revêtement pourvu d'une couche indicatrice

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Publication number Publication date
CN111164260A (zh) 2020-05-15
CN111164260B (zh) 2022-02-08
DE102017122668A1 (de) 2018-10-31
WO2019063302A1 (fr) 2019-04-04
EP3688221A1 (fr) 2020-08-05
US11208764B2 (en) 2021-12-28
US20200270811A1 (en) 2020-08-27
EP3688221C0 (fr) 2023-11-15

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