EP3587664B1 - Toile pour machines à papier ou pour machines de drainage de pâte à papier et utilisation d'une telle toile - Google Patents

Toile pour machines à papier ou pour machines de drainage de pâte à papier et utilisation d'une telle toile Download PDF

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Publication number
EP3587664B1
EP3587664B1 EP19175689.9A EP19175689A EP3587664B1 EP 3587664 B1 EP3587664 B1 EP 3587664B1 EP 19175689 A EP19175689 A EP 19175689A EP 3587664 B1 EP3587664 B1 EP 3587664B1
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EP
European Patent Office
Prior art keywords
threads
machine
paper
monofilaments
partially aromatic
Prior art date
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Active
Application number
EP19175689.9A
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German (de)
English (en)
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EP3587664A1 (fr
Inventor
Dirk Praschak
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.)
Heimbach GmbH and Co KG
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Heimbach GmbH and Co KG
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Publication of EP3587664A1 publication Critical patent/EP3587664A1/fr
Application granted granted Critical
Publication of EP3587664B1 publication Critical patent/EP3587664B1/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
    • D21F1/48—Suction apparatus
    • 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
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D11/00—Double or multi-ply fabrics not otherwise provided for
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
    • D03D15/513—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads heat-resistant or fireproof
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
    • D03D15/58—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads characterised by the coefficients of friction
    • 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
    • D21F1/0027—Screen-cloths
    • D21F1/0036—Multi-layer 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
    • D21F1/10—Wire-cloths
    • 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
    • D21F7/083—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
    • D21F7/086—Substantially impermeable for transferring fibrous webs
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/02—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides
    • D10B2331/021—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyamides aromatic polyamides, e.g. aramides
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/06—Load-responsive characteristics
    • D10B2401/063—Load-responsive characteristics high strength
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006—Making patterned paper

Definitions

  • the invention relates to a clothing for paper machines or pulp dewatering machines and the use of such.
  • Large paper machines usually consist of three so-called sections, namely a forming section, a press section and a dryer section when viewed in the direction of the course of the paper web.
  • the forming section is used to form the paper web from the paper pulp and for a first mechanical dewatering of the paper web thus formed.
  • the press section the paper web is passed between press rolls, where it is subjected to high pressures and thereby further mechanically dewatered.
  • the paper web is then fed to the dryer section, in which the paper web is guided over heated drying cylinders, whereby the paper web is thermally dewatered.
  • the paper web is guided through the paper machine by means of belts which are adapted to the requirements of the respective section, on which the paper web rests and which also serve to transfer the paper web from one section to the next.
  • So-called forming fabrics are used in the forming section. Examples of such and their leadership through a paper machine go from EP 2 067 895 B1 and the prior art discussed therein.
  • press felts are used, for which examples of the EP 1 452 639 B1 can be taken.
  • dryer fabrics are used, which are designed in particular as drying fabrics consisting of warp and weft threads. Examples of such dryer fabrics and for guiding the dryer fabrics through the dryer section of a paper machine can be EP 1 002 155 B1 , EP 1 507 041 B1 , EP 1 558 807 B1 , EP 1 857 588 A1 and EP 1 054 097 B1 can be removed.
  • transfer belts can be used, which the paper web through one or more presses pass through the press section together with the associated press felt and, after the press felt has been detached from the paper web, lead to a point where the paper web is removed from the transfer belt, usually with the aid of a suction roll, and taken over by a drying wire circulating in the dryer section.
  • Examples of the guidance of transfer belts in the press section of a paper machine are in particular the Figures 1 to 3 of the EP 0 576 115 A1 refer to.
  • threads made of polyamide are used in paper machine clothing.
  • a transfer belt for paper machines emerges that has a carrier fabric with weft threads made of aromatic polyamide.
  • This material is characterized by a comparatively low degree of water absorption, as a result of which an increase in the expansion of the tape in the width direction can be reduced due to a high water absorption of a paper-side fiber fleece made of hydrophilic fibers.
  • the US 2006/0275604 A1 discloses a paper machine felt with yarns, fibers or filaments which have polyamide and / or polyester in their polymer matrix, whereby a comparatively high abrasion resistance is ensured.
  • the U.S. 5,244,543 A a press felt for a paper machine having a body which comprises monofilament threads in the machine direction or longitudinal direction.
  • the monofilament threads in the longitudinal direction are interwoven with transverse threads, which are synthetic monofilament threads that can contain a partially aromatic polyamide.
  • a clothing for paper or pulp dewatering machines comprising or consisting of monofilaments comprising or consisting of a partially aromatic polyamide, characterized in that at least some of the monofilaments consists of a partially aromatic homo-polyamide or comprises one.
  • monofilaments can be obtained from partially aromatic polyamide, the use of which in clothing for paper or pulp dewatering machines leads to a combination of excellent product properties.
  • part of the monofilaments of the clothing according to the invention consists of a partially aromatic co-polyamide or comprises one, which has proven to be particularly suitable. It is provided that at least some of the monofilaments of the clothing according to the invention consist of a partially aromatic homo-polyamide or include one. Of course, it is also possible that at least some of the
  • Monofilaments consists of a combination of partially aromatic homo- and partially aromatic co-polyamide or includes such a combination.
  • a partially aromatic co-polyamide is one that has both aromatic and aliphatic components, as is the case, for example, with PA6T / 6, which comes from the range offered by the manufacturer BASF under the brand name Ultramid® T. In particular due to the presence of both components, the material is easier to process than is the case for aromatic polyamides, which only contain aromatic components.
  • monofilaments can be spun from partially aromatic co-polyamide, which are characterized in particular by low water absorption, high dimensional stability, high thermal and mechanical resilience, high abrasion resistance and good processability, and which optimize their use in coverings of the type mentioned Results at comparatively moderate costs.
  • the coverings according to the invention are distinguished, on the one hand, by a slight (water-related) change in shape, since the monofilaments made of partially aromatic copolyamide absorb water only to a comparatively small and significantly slower extent and thus have a shape-stabilizing effect. Furthermore, when using these monofilaments, due to the high mechanical stability, there is only a slight flattening at the crank points of the fabric. A problem known to the applicant with clothing of the conventional type, especially screens with monofilaments made of PET-TPU and in particular on the machine side, is reliably avoided as a result. Furthermore, it has been shown that the monofilaments made of partially aromatic co-polyamide are characterized in a covering by a particularly good positioning relative to the other threads in the fabric. They also have a high resilience to cleaning units, such as high pressure spray pipes, and excellent chemical resistance. It will continue to be a particularly low one Abrasion is guaranteed, which is a significant advantage, especially on the machine side of a covering.
  • monofilaments made of partially aromatic co-polyamide can also be an excellent alternative to filaments made of PET and, above all, a significantly cheaper alternative to threads made of polyphenylene sulfide (PPS) in particular Form in drying sieves.
  • PPS polyphenylene sulfide
  • Further advantageous properties of partially aromatic co-polyamide are a comparatively high glass transition temperature, a comparatively high melting point of in particular about 295 ° C., constant mechanical properties, high strength and rigidity, very good toughness, good spring properties.
  • the monofilaments that can be used in the context of the present invention can consist, for example, of a material or comprise such as is shown in FIG EP 2 860 220 A1 or in the EP 2 857 456 A1 is revealed.
  • These documents show in particular an impact-modified polyamide molding compound made from partially aromatic co-polyamide, for example PA6T / 6, and an olefinic co-polymer for adjusting the impact strength, which can be used to obtain the covering according to the invention.
  • monofilaments from partially aromatic polyamide can in particular, as is already well known for thermoplastics in general, be carried out by extrusion.
  • plastic threads formed as monofilaments made of partially aromatic polyamide, in particular co-polyamide form part of a clothing for a paper machine or pulp dewatering machine.
  • co-polyamide is a co-polymer (also referred to as heteropolymer), i.e. a polymer that is composed of two or more monomers.
  • the counterpart to co-polymers is also known to be the homo-polymers, which are polymers that are composed of only one type of monomer.
  • a covering has in particular longitudinal threads extending in a running direction and transverse threads extending transversely to these, which then can be given partly or entirely by monofilaments made of or with partly aromatic polyamide. At least some of the transverse threads are preferably provided by monofilaments made of such a material.
  • the longitudinal threads which are primarily the force-absorbing threads, can be made of polyester, as known from conventional coverings, which is characterized by an even higher tensile strength. Of course, these can also consist at least partly of partially aromatic polyamide.
  • the covering according to the invention has only one fabric layer or also several fabric layers. If there are several layers, only one of the layers can have monofilaments with or made of partially aromatic polyamide, or this applies to several, possibly all layers of the covering, with the individual layer (s) again only partially or completely made up of monofilaments this material can be formed. Is z. If a machine-side fabric layer is provided, for example, it is preferred that at least the machine-side fabric layer comprises or consists of monofilaments with or from a partially aromatic polyamide. This ensures particularly high abrasion resistance, especially on the machine side that is subject to particularly high loads.
  • the machine-side fabric layer has longitudinal threads extending in one direction and transverse threads extending transversely to the longitudinal threads, it is preferably provided that at least some of the transverse threads of the machine-side fabric layer are monofilaments made of a partially aromatic polyamide.
  • the clothing according to the invention can be designed, for example, as a forming wire or drying wire and in this function can be used in particular in a paper machine. It is also possible that the covering according to the invention is designed as a press felt or transfer belt and is used accordingly. It should be noted that the structure of the cover according to the invention is identical to that of the coverings of a corresponding type known from the prior art and the only difference can be that at least part of the cover is formed by monofilaments with or from partially aromatic polyamide.
  • the partially aromatic copolyamide used in particular is preferably one which is characterized by a base of hexamethylenediamine and terephthalic acid and caprolactam.
  • the PA6T / 6 already mentioned is particularly preferred.
  • Another object of the invention is the use of a clothing according to the invention in a paper machine or pulp dewatering machine.
  • the Figure 1 shows in a cross section - that is, transversely to the intended running direction - a section of a first embodiment of a clothing in a schematic representation, which is specifically given by a forming fabric 1 for use in the forming area of a paper machine.
  • the forming fabric 1 is a double-layer fabric with an upper, paper-side fabric layer 2 and a lower, machine-side fabric layer 3.
  • Both fabric layers 2, 3 comprise longitudinal or warp threads - which are designated in the figure as 4 and 5, respectively - With a thread count ratio of 1: 1, a longitudinal thread 4 of the paper-side fabric layer 2 being arranged exactly above a longitudinal thread 5 in the machine-side fabric layer 3.
  • the longitudinal threads 4, 5 are therefore each in pairs on top of one another.
  • the diameter of the longitudinal threads 4 in the paper-side fabric layer 2 is 0.11 mm and the diameter of the longitudinal threads 5 in the machine-side fabric layer 3 is 0.18 mm. They are made of polyethylene terephthalate (PET). The number of longitudinal threads is 58 per cm in the transverse direction.
  • paper-side transverse or weft threads 6, 7 are bound in with the longitudinal threads 4 to form a linen weave. Adjacent ones follow perpendicular to the drawing plane paper-side transverse threads 6, 7 on top of one another.
  • the paper-side transverse threads 6, 7 are made of polyethylene terephthalate (PET) and they have a diameter of 0.11 mm.
  • Machine-side transverse threads 8 of which only one can be seen in the figure, are incorporated exclusively into the machine-side longitudinal threads 5.
  • the machine-side transverse threads 8 each form floats - denoted by 9 for example - on the machine side of the forming wire 1 and then each bind with a single machine-side longitudinal thread 5.
  • the machine-side floats 9 represent abrasion material to protect the machine-side longitudinal threads 5, which are heavily stressed in tension.
  • the diameter of the machine-side transverse threads 8 is 0.22 mm.
  • the machine-side transverse threads 8 are given by monofilaments made of partially aromatic co-polyamide, specifically PA6T / 6. A section from the polymer chain of PA6T / 6 can be Figure 9 can be removed. It should be emphasized that the proportions shown therein and the order may vary.
  • the fabric layers 2, 3 are connected by pairs of two binding transverse threads 10, 11 each lying next to one another in the longitudinal direction. They have a diameter of 0.11 mm and are made of PET. They bind in the paper-side fabric layer 2 one after the other alternately on the top and bottom with paper-side longitudinal threads 4, then run between the two fabric layers 2, 3 over three longitudinal threads 4 and 5 and then bind with a single longitudinal thread 5 in the machine-side fabric layer 3, before they float between the two fabric layers 2 and 3 again.
  • the paired binding transverse threads 10 and 11 each have the same binding repeat, but are shifted to one another in the transverse direction - ie in their longitudinal direction - that the binding patterns in the paper-side fabric layer 2 complement each other so that they together form a canvas pattern there form analogous to the paper-side transverse threads 6, 7. In this way, an almost uniform canvas pattern is created on the paper side of the forming fabric 1, which provides a high level of fiber retention.
  • the degree of filling of the longitudinal threads of the paper-side fabric layer 2 is 31%, the total degree of filling of the paper-side and machine-side longitudinal threads 4, 5 is 82%.
  • the number of transverse threads is 108 per cm in the longitudinal direction of the forming fabric 1. This creates a high degree of openness and thus a good dewatering effect despite high fiber retention.
  • the forming fabric 1 corresponds to that which in the single figure also goes back to the applicant EP 2 067 895 B1 is shown and its advantages are explained in more detail therein.
  • the forming fabric 1 shown here is the machine-side transverse threads 8 by monofilaments made of partially aromatic co-polyamide, specifically PA6T / 6.
  • PA6T / 6 partially aromatic co-polyamide
  • the Figure 2 shows in a cross section a detail of a second embodiment of a clothing, which is also designed as a forming fabric 12 for a paper machine and in its structure to that in Figure 1 which also goes back to the applicant EP 2 899 311 B1 the forming fabric shown is the same.
  • the forming fabric 12 from Figure 2 is also multi-ply, specifically comprises a paper-side and a machine-side fabric layer 13, 14.
  • the paper-side fabric layer 13 has paper-side longitudinal threads - in the Figure 2 denoted by 15 as an example, which extend in the running direction of the screen 12, as well as paper-side transverse threads 16, 17 oriented transversely to these, both of which have a round cross-section.
  • the paper-side transverse threads comprise transverse binding threads 16 and transverse threads 17 which do not form transverse binding threads. These two types of threads 16, 17 alternate in the direction of the paper-side longitudinal threads 15.
  • the paper-side transverse threads 16, 17 are in principle interwoven in a linen weave.
  • the machine-side fabric layer 14 consists of machine-side longitudinal threads - denoted by 18 as an example - and machine-side transverse threads 19, of which in FIG Figure 2 only one can be seen.
  • the machine-side transverse threads 19 run in such a way that they form floats 20 on the machine side, which each run under five adjacent machine-side longitudinal threads 18. Between the floats 20, the machine-side transverse threads 19 bind a machine-side longitudinal thread 18 in a crank 21. Both the machine-side transverse threads 19 and the machine-side longitudinal threads 18 each have a circular cross section.
  • the ratio of the paper-side longitudinal threads 15 and the machine-side longitudinal threads 18 is again 1: 1.
  • the transverse binding thread 16 binds with a paper-side longitudinal thread 15a by running over its paper side, then changing from the paper-side fabric layer 13 to the machine-side fabric layer 14 through an almost vertical course, i.e. in the thickness direction of the screen 12 and with the machine-side fabric layer 14 binds with two adjacent longitudinal threads 18a and 18b by engaging over them on the machine side.
  • the two machine-side longitudinal threads 18a, 18b lie next to the crank 21.
  • the transverse binding thread 16 then runs back to the paper-side fabric layer 13 and binds with a paper-side longitudinal thread 15b.
  • the paper-side longitudinal threads 15a, 5b are only separated from one another by a paper-side longitudinal thread 15c.
  • the Figure 2 shows only one tie point 22.
  • the number of tie points 22 can be selected depending on the requirement for a sufficiently strong connection of the two fabric layers 13, 14. Further explanations, including the advantages of the specific structure of the forming fabric 12, can be found in the EP 2 899 311 B1 can be
  • the machine-side transverse threads 19 are - exactly as in the first embodiment - given by monofilaments made of partially aromatic co-polyamide, specifically PA6T / 6, whereby the same advantages compared to the previously known embodiment are achieved as already described above for the first embodiment Figure 1 have been explained.
  • FIG 3 shows a third embodiment of a clothing, specifically a schematically shown wet press felt 23, which is intended for use in the press section of a paper machine.
  • the carrier 24 of the wet press felt 23 can be seen.
  • the fiber layers embedding the carrier 24 are omitted.
  • the carrier 24 is only partially shown here. He sits down in shape to the left of a lying U - in Figure 3 indicated by dashed lines - so that the carrier 24 as a whole represents a lying U.
  • the extension of the U is adapted to the respective installation conditions in the paper machine.
  • the wet press felt 23 is similar in structure to that of the one in FIG Figures 1 and 2 which also goes back to the applicant EP 1 452 639 B1 shown wet press felt.
  • the carrier 24 consists of a carrier layer 25 on the inside and a carrier layer 26 on the outside. Both carrier layers 25, 26 are designed as woven fabrics which are produced by circular weaving in a continuous weaving process.
  • the fabrics have transverse threads - designated by way of example with 27 and 28, respectively - which have formed the warp threads during the weaving process, as well as longitudinal threads 29, 30 as weft threads. Due to their property as weft threads, the longitudinal threads 29, 30 are parts of a single continuous thread.
  • the transverse threads 27, 28 bind with the longitudinal threads 29, 30 in such a way that the two carrier layers 25, 26 have no connection to one another via threads over the surface, i.e. the transverse threads 27 do not bind into the carrier layer 26 and the transverse threads 28 do not bind into the carrier layer 25 and the longitudinal threads 29, 30 remain in the respective carrier layer 25 and 26 over the entire length of the carrier 24.
  • every second longitudinal thread 29, 30 forms seam loops 33, 34 which protrude beyond the ends 31, 32.
  • the longitudinal threads 29, 30, which each run between two longitudinal threads 29, 30 forming seam loops 33, 34, are returned over a short distance without the formation of seam loops.
  • One row of seam loops 33 is connected to the other row of seam loops 34 - as shown - brought into a comb-like overlap so that a push-through channel 35 is formed perpendicular to the plane of the drawing.
  • a pintle wire 36 By pushing a pintle wire 36 through the feed-through channel 35, the seam loops 33, 34 and thus the ends 31, 32 of the carrier 24 are coupled to one another, so that an endless carrier 24 and thus also an endless wet press felt 23 is created.
  • the coupling takes place after the wet press felt 23 has been drawn into the press section of the paper machine.
  • the binding transverse threads 37, 38, 39, 40 are shown reinforced in order to make their course relative to the course of the remaining transverse threads 27, 28 clear. While the remaining transverse threads 27, 28 with the longitudinal threads 29, 30 in a linen weave are bound exclusively in the carrier layer 25 or the carrier layer 26, the binding cross threads 37, 38, 39, 40 run in such a way that they alternately bind into both carrier layers 25, 26 in each case by a longitudinal thread 29 in one carrier layer 25 and - offset by two longitudinal threads 29, 30 - by a longitudinal thread 30 in the other carrier layer 26. This course of the binding transverse threads 37, 38, 39, 40 causes the seam loops 33, 34 closed on the carrier side.
  • All threads 27, 28, 29, 30, 37, 38, 39, 40 of the wet press felt 23 from the Figures 3 and 4th are given by monofilaments made of partially aromatic co-polyamide, specifically PA6T / 6, whereby a wet press felt with the excellent properties already discussed above in connection with the previous exemplary embodiments is obtained. It is characterized in particular by excellent dimensional stability in both the length and width direction, high thermal resistance and high mechanical resistance, especially against pressure loads, and particularly high abrasion resistance.
  • a fourth embodiment of a covering is shown, which is a dryer fabric 41.
  • the dryer fabric 41 on the paper side has wide flat transverse threads - denoted by 42 for example - which are bound in by pairs of longitudinal threads - denoted as 43 for example, with each pair of longitudinal threads 43 consisting of two longitudinal threads - denoted by 44, 45 for example, which run coexistently within a longitudinal thread pair 43.
  • the longitudinal thread pairs 43 bind with the flat transverse threads 42 in the manner of a linen weave, ie they bind a flat transverse thread 42 on the paper side and the subsequent flat transverse thread 42 on the machine side and then again the subsequent flat transverse thread 42 on the paper side.
  • the longitudinal threads 44, 45 of the longitudinal thread pairs 43 form in the version below the dash-dotted line on the front edge 48 of the dryer fabric 41 large loops - designated as 49 for example - and small loops - designated 50 for example.
  • the large loops 49 alternate with small loops 50.
  • the version above the dash-dotted line only forms large loops 49. It goes without saying that this illustration is intended to show two different types of end edges 48, but that only one loop version is present in a dryer fabric.
  • the large loops 49 form loop eyelets 51, these loops 49 being able to overlap with corresponding large loops on the other end edge of the dryer fabric 41 so that all loop eyelets 51 are aligned and thus form a channel through which in a manner known per se Pintle wire to connect the front edges 48 can be pushed to form a so-called pintle wire seam.
  • a longitudinal thread 44 of a longitudinal thread pair 43 is woven back after the loop formation in such a way that it forms the adjacent longitudinal thread 52 of the adjacent longitudinal thread pair 53.
  • the same applies to the longitudinal thread 45 of the longitudinal thread pair 43 that is, by forming the loop it becomes the adjacent longitudinal thread 54 of the adjacent longitudinal thread pair 55. This results in only slight twisting of the loops 49, 50 and a very even fabric image of the dryer fabric 41 on the paper side.
  • All threads 42, 44, 45, 46, 47 of the dryer fabric 41 from the Figures 5 and 6 are given by monofilaments made of partially aromatic co-polyamide, specifically PA6T / 6.
  • PA6T / 6 As an alternative to the embodiment shown, it can also be provided that only the flat transverse threads 42 and / or the round transverse threads 46, 47 are in the form of monofilaments made of partially aromatic co-polyamide, in particular PA6T / 6, and the remaining threads are made of a different material.
  • the drying screen 41 consists of monofilaments made of partially aromatic copolyamide, or has them, it is also distinguished by the advantages over the prior art already discussed in connection with the previous embodiments, in particular good hydrolysis stability and over the prior art Technology significantly higher abrasion resistance - especially in comparison to dryer fabrics made of PPS.
  • FIGS 7 and 8 finally show sections of the base fabric 56 of a fifth and a sixth embodiment of a covering, which are each designed as a flow-through coverings for dewatering a paper web or cellulose and are similar in structure to those in the Figures 1 and 2 which also goes back to the applicant DE 20 2013 104 888 U1 are shown.
  • the base fabric 56 shown is designed as a single-layer fabric in a plain weave and consists of base warp threads - denoted by 57 as an example - and base weft threads - denoted 58 as an example.
  • Several additional warp threads are woven into the base fabric 56 - denoted by 59 for example - which are arranged next to one another at equal intervals and have an identical course. They are shown filled in black. Their course is also symmetrical to axes of symmetry which run parallel to the basic warp threads 57 and to the basic weft threads 58.
  • the additional warp threads 59 move back and forth in that they cross two adjacent base warp threads 57 on their upper sides running parallel to the base weft threads 58, then bind with a base weft thread 58 at the turning point - denoted for example by 60 - and run there parallel to the base warp threads 57, then in In the other direction, cross two base warp threads 57 on the upper side and tie with the adjacent base weft thread 58 at the next turning point 60. This creates a rectangular meandering course of the additional warp threads 59.
  • FIG. 8 are in the base fabric 56 additional warp threads - designated as 61 and 62 for example - woven, the one different course than the additional warp threads 59 according to Fig. 7 to have.
  • the course is in contrast to that of the additional warp threads 59 according to FIG Fig. 7 more approximated to an arch shape.
  • the additional warp thread 61 initially runs in a section parallel to the base weft threads 58 over a base warp thread 57. This is followed by an oblique section which runs between the adjacent base warp thread 57 and a base weft thread 58. At the turning point 60, a section parallel to the base warp threads 57 crosses the adjacent base weft thread 58 on its underside.
  • the additional warp threads 59, 61, 62 form a structural principle that can be implemented in an extremely varied manner, so that the base fabric 56 provided with it can be flexibly adapted to the respective requirements in the individual sections of the paper machine or pulp dewatering machine with regard to a number of properties.
  • the additional warp threads 59, 61, 62 in particular allow a kind of functional separation in that the construction of the base fabric 56 is optimally adapted to the basic requirements such as strength and dimensional stability, while other properties, such as drainage, abrasion resistance, fiber retention or the like, with the help of the Additional warp threads 59, 61, 62 are optimized.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Woven Fabrics (AREA)

Claims (11)

  1. Entoilage pour machines à déshydrater le papier ou la pâte à papier, comprenant ou consistant en monofilaments avec ou d'un polyamide partiellement aromatique, caractérisé en ce qu'au moins une partie des monofilaments consiste en ou comprend un homo-polyamide partiellement aromatique.
  2. Entoilage selon la revendication 1, caractérisé en ce qu'une couche de tissu du côté machine est prévue, et au moins la couche de tissu du côté machine comprend ou consiste en monofilaments avec ou d'un polyamide partiellement aromatique.
  3. Entoilage selon la revendication 1 ou 2, caractérisé en ce que l'entoilage comprend ou est formé par des fils longitudinaux s'étendant dans une direction de marche et des fils transversaux s'étendant transversalement aux fils longitudinaux, et au moins certains des fils transversaux sont des monofilaments avec ou d'un polyamide partiellement aromatique.
  4. Entoilage selon les revendications 2 et 3, caractérisé en ce que la couche de tissu côté machine comprend des fils longitudinaux s'étendant dans une direction de marche et des fils transversaux s'étendant transversalement aux fils longitudinaux, et au moins une partie des fils transversaux de la couche de tissu côté machine sont des monofilaments avec ou d'un polyamide partiellement aromatique.
  5. Entoilage selon l'une des revendications précédentes, caractérisés en ce que tous les fils de l'entoilage sont des monofilaments avec ou d'un polyamide partiellement aromatique.
  6. Entoilage selon l'une des revendications 1 à 5, caractérisé en ce que l'entoilage est conçu comme un tamis de formage ou un tamis de séchage.
  7. Entoilage selon l'une des revendications 1 à 5, caractérisé en ce que le tamis est conçu comme un feutre de presse, le feutre de presse étant de préférence un feutre de couture.
  8. Entoilage selon l'une des revendications précédentes, caractérisé en ce qu'une partie des monofilaments consiste en ou comprends un co-polyamide partiellement aromatique.
  9. Entoilage selon la revendication 8, caractérisé en ce qu'une partie des monofilaments consiste en ou comprend un co-polyamide partiellement aromatique à base d'une composition avec de l'hexaméthylènediamine, de l'acide téréphtalique et du lactame, de préférence du caprolactame, ou un acide dicarboxylique aliphatique.
  10. Entoilage selon l'une des revendications précédentes, caractérisée en ce qu'une partie des monofilaments consiste en ou comprends PA6T/6.
  11. Utilisation d'un entoilage selon l'une des revendications précédentes dans une machine à papier ou une machine à déshydrater la pâte.
EP19175689.9A 2018-06-21 2019-05-21 Toile pour machines à papier ou pour machines de drainage de pâte à papier et utilisation d'une telle toile Active EP3587664B1 (fr)

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DE202018103522.3U DE202018103522U1 (de) 2018-06-21 2018-06-21 Bespannung für Papiermaschinen oder Zellstoffentwässerungsmaschinen sowie Verwendung einer solchen

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JP (1) JP2020012225A (fr)
CN (1) CN110629580B (fr)
DE (1) DE202018103522U1 (fr)
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USD955758S1 (en) * 2019-12-23 2022-06-28 Columbia Insurance Company Tufted article
USD920684S1 (en) * 2020-01-07 2021-06-01 Gil Mueller Woven textile
USD954448S1 (en) * 2020-05-12 2022-06-14 Columbia Insurance Company Tufted article

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Also Published As

Publication number Publication date
EP3587664A1 (fr) 2020-01-01
CN110629580B (zh) 2021-10-08
PT3587664T (pt) 2020-12-21
ES2836757T3 (es) 2021-06-28
US20190390406A1 (en) 2019-12-26
JP2020012225A (ja) 2020-01-23
CN110629580A (zh) 2019-12-31
DE202018103522U1 (de) 2018-09-14
US11230808B2 (en) 2022-01-25

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