EP4261345A1 - Transportband, insbesondere transferband für eine papiermaschine - Google Patents

Transportband, insbesondere transferband für eine papiermaschine Download PDF

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Publication number
EP4261345A1
EP4261345A1 EP23150595.9A EP23150595A EP4261345A1 EP 4261345 A1 EP4261345 A1 EP 4261345A1 EP 23150595 A EP23150595 A EP 23150595A EP 4261345 A1 EP4261345 A1 EP 4261345A1
Authority
EP
European Patent Office
Prior art keywords
threads
multiaxial
conveyor belt
paper
longitudinal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23150595.9A
Other languages
German (de)
English (en)
French (fr)
Inventor
Christian Molls
Dirk Praschak
Telgmann Dieter
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
Original Assignee
Heimbach GmbH and Co KG
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 Heimbach GmbH and Co KG filed Critical Heimbach GmbH and Co KG
Publication of EP4261345A1 publication Critical patent/EP4261345A1/de
Pending legal-status Critical Current

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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
    • D21F1/0036—Multi-layer screen-cloths
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F2/00—Transferring continuous webs from wet ends to press sections
    • 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

Definitions

  • the present invention relates to a conveyor belt, in particular transfer belt, for a paper machine, with a paper side intended for the support of a paper web and a machine side facing away from the paper side, comprising a carrier and a water-impermeable construction material in which the carrier is partially or completely embedded and that forms a paper contact surface on the paper side and a machine contact surface of the conveyor belt on the machine side.
  • the increase in speed necessarily leads to a corresponding increase in the tension of the paper web during transport through the paper machine. Accordingly, it is necessary to support the paper web as it passes through the paper machine.
  • the paper machine In the press section, the paper machine is fully supported with the help of the press felts circulating there. However, problems arise in those areas where there is no support from the press felt. This applies in particular to the route from the Press section to drying section. Here, the wet strength of the paper web is not sufficient to withstand the high tensions.
  • transfer belts are used, particularly in the transition area from the press section to the drying section, which serve as pure conveyor belts without a drainage function.
  • These transfer belts usually have a smooth, flat surface with which the paper web comes into direct contact and which, with their special topographical properties, ensures perfect web removal, excellent web support and problem-free delivery of the paper web.
  • a transfer tape of the type mentioned at the beginning is, for example, the one that goes back to the applicant DE 20 2017 101 585 U1 described.
  • This has a carrier that is designed as a circular fabric with longitudinal threads and transverse threads, and a fiber fleece arranged on the machine side of the carrier.
  • the carrier and the fiber fleece are embedded in a layer of a construction material that consists of an elastomeric material, in particular polyurethane.
  • the building material thus forms a contact surface for a paper web on the paper side of the transfer belt, as well as the contact surface for the rollers of the paper machine on the machine side.
  • the invention is therefore based on the object of specifying a conveyor belt of the type mentioned at the outset, which can be produced with comparatively little effort and which is at the same time characterized by a comparatively long service life and optimal operating properties.
  • this object is achieved in a conveyor belt of the type mentioned in that the carrier is designed as a multiaxial carrier.
  • the invention is therefore based on the idea of designing the carrier, which ensures the structural strength of the conveyor belt, as a multiaxial carrier.
  • a particularly stable carrier can be obtained from multiaxial layers, which results in a particularly long service life and running time of the conveyor belt according to the invention. Furthermore, the carrier can be manufactured with comparatively little effort.
  • multiaxial layers according to the invention offers the further advantage that the dimensional limitations of conventionally produced textile webs, in particular carriers for felts designed as flat and/or round fabrics, can be overcome in a simple manner.
  • Multiaxial layers can be obtained, for example, by placing one or more partial web strips in the longitudinal direction of the conveyor belt helically transversely winds progressively.
  • a textile web whose width exceeds that of the partial web strip can be obtained from a partial web strip with a predetermined width by winding in a helix-like manner.
  • the final width of the conveyor belt can be achieved very flexibly, in particular by adjusting the width of the partial web strip and the number of windings.
  • Another advantage of a multiaxial carrier compared to conventional endless carriers, especially compared to circular fabrics, is the possibility of controlling the product properties by variable introduction of different CD materials, e.g. B. by inserting suitable weft threads, without comparatively great technical effort - in contrast to the appropriate preparation of warp beams for circular fabrics.
  • the wearer can meet the target both in terms of its dimensional stability, especially in CD, and its permeability to ensure perfect impregnation with the polymer matrix.
  • the angle ⁇ which the partial web longitudinal direction of a multiaxial layer includes with the longitudinal direction of this multiaxial layer and the angle ⁇ ', which the partial web longitudinal direction of the or another multiaxial layer includes with the longitudinal direction of this other multiaxial layer, correspond in terms of amount and / or are opposite.
  • the angle ⁇ which the partial web transverse direction of a multiaxial layer includes with the transverse direction of this multiaxial layer
  • the angle ⁇ ' which the partial web transverse direction of the or another multiaxial layer includes with the transverse direction of this other multiaxial layer, can be the same in magnitude and/or opposite in direction.
  • the partial webs of the two multiaxial layers have the same width in the partial web transverse direction, it makes sense if the angles match in magnitude and are in opposite directions. This enables a particularly even distribution of force. If the sub-tracks of the multiaxial layers have different widths, the angles ⁇ , ⁇ ' and ⁇ , ⁇ ' will differ from each other, but an opposite orientation still makes sense.
  • the angle ⁇ , ⁇ ' which the partial web longitudinal direction of the multiaxial layer includes with the longitudinal direction of the multiaxial layer is at least 0.6°, in particular at least 1.5° and preferably at least 2 ° and/or at most 10°, in particular at most 7° and preferably at most 5°.
  • the setting of the angle size is inversely proportional to the length of the conveyor belt - with a defined width of the partial tracks.
  • the angle that the partial web longitudinal direction of a multiaxial layer includes with the longitudinal direction of this multiaxial layer becomes smaller as the length of the conveyor belt increases.
  • At least one multiaxial layer that the longitudinal threads of the partial webs of the multiaxial layer run parallel or substantially parallel to one another and/or that the transverse threads of the partial webs of the multiaxial layer run parallel or substantially parallel to one another.
  • the basic requirement here is that the longitudinal threads should extend in the longitudinal direction of the partial web.
  • the sub-webs forming the multiaxial layer are each designed in the same way as a woven fabric, in particular as a single-layer flat woven fabric, as a knitted fabric, as a scrim, as a braid or as extruded netting.
  • This type of textile fabric has a comparatively open structure.
  • Fabric multiaxial layers have proven to be particularly suitable.
  • a further embodiment of the conveyor belt according to the invention is characterized in that at least some of the longitudinal threads, preferably all longitudinal threads, are made of monofilaments and/or staple fiber yarns and/or Threads, which consist in particular of monofilaments, are formed and/or that some of the transverse threads, preferably all of the transverse threads, are formed by monofilaments and/or by staple fiber yarns and/or by threads which in particular consist of monofilaments.
  • the longitudinal threads preferably all longitudinal threads, consist of monofilaments and/or monofilament twists and some of the transverse threads, preferably all transverse threads, consist of monofilaments and/or monofilament twists, with the monofilament twists being preferred each consisting of four or six or nine monofilaments with a diameter in the range of 0.15 mm to 0.25 mm and/or wherein the monofilaments preferably have a diameter in the range of 0.3 mm to 0.50 mm.
  • some of the longitudinal threads preferably all of the longitudinal threads, have a circular and/or round and/or rectangular cross section and/or are designed as flat threads.
  • some of the transverse threads preferably all of the transverse threads, have a circular and/or round and/or rectangular cross section and/or are designed as flat threads.
  • the longitudinal threads and/or the transverse threads consist of a polymer material. It is preferred if the longitudinal threads and/or the transverse threads consist of polyamide (PA) and/or polyester, in particular polyethylene terephthalate (PET), and/or polyethylene furanoate (PEF), with the longitudinal threads preferably made of polyamide 6 (PA6) and /or consist of PET and/or PEF and the transverse threads consist of PA6 and/or PA6.10 and/or PA4.10 and/or PA11 and/or PET and/or PEF.
  • PA polyamide
  • PET polyethylene terephthalate
  • PEF polyethylene furanoate
  • the multiaxial layers of the carrier can be connected directly to one another, with the multiaxial layers then preferably being welded together, glued or needled.
  • the preferred embodiment is not to connect the multiaxial layers directly to one another, but rather to fix them to one another exclusively through the building material, that is, indirectly.
  • the carrier can have two multiaxial layers that are designed as endless loops.
  • the multiaxial layers are preferably obtained by helix-like winding of at least one partial web strip whose width is less than the width of the conveyor belt and whose length exceeds the length of the conveyor belt.
  • the partial webs preferably have straight edges. However, it is possible for the partial webs to have toothed or meandering or wavy longitudinal edges. With both straight and non-straight longitudinal edges, the partial webs can be brought into contact with one another or positioned in an overlapping manner.
  • partial webs lying next to one another are connected to one another at their longitudinal edges.
  • they can be sewn together and/or glued together and/or fused together and/or welded together.
  • the construction material may include or consist of natural rubber.
  • the construction material comprises or consists of at least one synthetic elastomer, in particular a polyurethane elastomer and/or a polyurea elastomer and/or a silicone elastomer and/or a polyester elastomer.
  • the construction material consists of a multi-component polyurethane casting resin system, in particular a methylene diphenyl diisocyanate (MDI) -based or a toluene diisocyanate (TDI) -based polyether-polyurethane prepolymer and / or a polytetramethylene ether glycol (PTMEG) polyol and / or an amine crosslinker and / or several amine crosslinkers and / or further polyvalent crosslinkers.
  • MDI methylene diphenyl diisocyanate
  • TDI toluene diisocyanate
  • PTMEG polytetramethylene ether glycol
  • the building material preferably has a hardness in the range of 80 to 99 Shore A and/or the paper contact surface (5) of the building material (4) has a roughness Ra in the range of approximately 1.0 ⁇ m to 5, 0 ⁇ m.
  • a reinforcement is embedded in the construction material, particularly on the machine side of the transfer belt, in order to give the conveyor belt increased stability.
  • the reinforcement can be formed in the form of a woven fabric and/or a knitted fabric and/or a braid and/or a scrim and/or an extruded netting and/or a nonwoven.
  • the building material in the area of the paper contact surface is smooth or has a texturing for paper smoothing and/or for paper embossing, and/or that the building material in the area of the machine contact surface has depressions, in particular grooves and/or or blind holes.
  • the paper contact surface is therefore coordinated so that it comes into direct contact with the paper web and provides it with a smooth surface or a desired texturing/embossing.
  • a structure is provided which serves in particular to absorb and drain liquids, so that optimal static friction contact between the machine contact surface and the components of the paper machine, in particular its rollers, is guaranteed.
  • the invention relates to the use of a conveyor belt according to the invention in a machine in such a way that a paper web guided through the paper machine comes into contact with the paper side of the conveyor belt, in particular in the press section of a paper machine.
  • the Figure 1 shows a schematic representation of a section of a conveyor belt according to the invention, here a transfer belt, of a paper machine in cross section, with the top forming the paper side and the underside forming the machine side of the transfer belt.
  • the transfer belt comprises a carrier 1.
  • This is designed as a multiaxial carrier which has two multiaxial layers 2, 3 positioned directly one above the other.
  • the multiaxial layers 2, 3 are designed as endless loops, the loop of the machine-side multiaxial layer 3 being positioned within the loop of the paper-side multiaxial layer 2 and preferably being correspondingly shorter.
  • the carrier 1 is completely embedded in a building material 4, which forms a paper contact surface 5 on the paper side - i.e. on the top - and a machine contact surface 6 of the transfer belt on the machine side - i.e. on the underside.
  • the two multiaxial layers 2, 3 are connected to one another exclusively by the building material 4 and are not otherwise fastened to one another, for example not directly needled and/or glued to one another.
  • the building material 4 consists of an elastomer, here a multi-component polyurethane casting resin system, which has a methylene diphenyl diisocyanate (MDI) based polyether-polyurethane prepolymer, a polytetramethylene ether glycol (PTMG) polyol and amine crosslinkers.
  • MDI methylene diphenyl diisocyanate
  • PTMG polytetramethylene ether glycol
  • amine crosslinkers amine crosslinkers.
  • the construction material 4 has a hardness in the range of 80 to 99 Shore A.
  • the paper contact surface 5 formed by the building material 4 has a roughness Ra in the range of approximately 1.0 ⁇ m to 5.0 ⁇ m. It is smooth, but can also be provided with texturing in order to smooth a paper web or to provide it with texturing/embossing.
  • the machine contact surface 6, is provided with a plurality of depressions 7, in this case grooves, which extend orthogonally to the drawing plane, i.e. in a longitudinal direction of the transfer belt.
  • the depressions 7 serve to absorb liquid and/or impurities, so that optimal static friction contact between the machine contact surface 6 and the components, in particular the rollers of a paper machine, is guaranteed.
  • the carrier 1 extends in a longitudinal direction, namely the machine direction MD and in a transverse direction CD running transversely thereto.
  • the multiaxial layers 2, 3 of the carrier 1 have a corresponding orientation.
  • each of the two multiaxial layers 2, 3 of the carrier 1, viewed in the transverse direction CD, is composed of several adjacent partial webs 8.
  • the partial webs 8 of the product-side multiaxial layer 2 lying on top in this figure are shown with solid lines and the partial webs 8 of the machine-side multiaxial layer 3 immediately below are shown with dashed lines.
  • Each sub-web 8 comprises longitudinal threads 9 which extend in a sub-web longitudinal direction TL, and transverse threads 10 extending orthogonally thereto in a sub-web transverse direction TQ.
  • the longitudinal threads 9 and transverse threads 10 are in the Figure 2 not shown, but can correspond to the exemplary embodiments Figures 4 up to 6 can be removed.
  • the partial web longitudinal direction TL of the partial webs 8 is inclined relative to the longitudinal direction MD of the carrier 1 and thus the multiaxial layers 2, 3, and forms an angle ⁇ , ⁇ 'with this.
  • the partial web transverse direction TQ of the partial webs 8 is opposite Transverse direction CD of the multiaxial layers 2, 3 is inclined and forms an angle ⁇ , ⁇ with the transverse direction CD.
  • the angle ⁇ , which the partial web longitudinal directions TL of the paper-side multiaxial layer 2 includes with the longitudinal direction MD, and the angle ⁇ ', which the partial web longitudinal direction TL of the machine-side multiaxial layer 3 includes with the longitudinal direction MD, agree in terms of magnitude, but the angles ⁇ , ⁇ ' oriented in opposite directions.
  • angles ⁇ and ⁇ ' are each approximately 4 °, but they are drawn exaggerated for reasons of illustration.
  • the angles ⁇ and ⁇ ' are equal in magnitude at approximately 4°, but are oriented in opposite directions.
  • the two multiaxial layers 2, 3 are obtained by helix-like winding at least one partial web strip B, the width of which is several times less than the width of the transfer belt and whose length exceeds the length of the transfer belt by several times.
  • the sub-webs 8 formed from the sub-web strips B are formed as a thread layer with longitudinal threads 9 running in the sub-web longitudinal direction TL and transverse threads 10 running orthogonally thereto in the sub-web transverse direction TQ.
  • the transverse threads 10 In the area of their mutually facing longitudinal edges 11, the transverse threads 10 have fringe-like protruding transverse thread sections 12, which interlock with one another in an overlapping manner in the partial web longitudinal direction TL.
  • a Connecting thread 13 is placed, which is welded to the transverse thread sections 12.
  • the connecting thread 13 is formed here by a longitudinal thread 9.
  • FIG. 3 A laser welding device 14 is shown schematically, which is moved along the connecting thread 13 over the overlapping transverse thread sections and establishes the connection between the connecting thread 13 and the transverse thread sections 12.
  • the partial webs 8 and thus the multiaxial layers 2, 3 made from them are designed as flat fabrics.
  • the longitudinal and transverse threads 9, 10 consist of plastics, for example polyamide, polyester, etc. They can be formed from monofilaments, from threads, in particular monofilament threads, from staple fiber yarns, etc.
  • the longitudinal threads 9 or warp threads preferably consist of a monofilament thread, which is formed from four, six or nine monofilaments, each with a diameter in the range of 0.15 mm to 0.25 mm, and the transverse threads 10 or weft threads consist of monofilaments a diameter in the range of 0.30 mm to 0.50 mm.
  • the longitudinal threads 9 or warp threads consist of PA6, PET or PEF, while the transverse threads 10 or weft threads consist of PA6, PA6.10, PA4.10, PA11, PET or PEF.
  • the partial webs 8 have protruding transverse thread sections 12 in the area of the longitudinal edges 11, which face one another when they abut.
  • the lengths of the transverse thread sections 12 are dimensioned so that the free distance between the The longitudinal threads 9 adjacent to the longitudinal edges 11 of the partial webs 8 are twice as large as the free distance between the longitudinal threads 9 among themselves.
  • a filling thread 15 is inserted between the two mutually facing longitudinal threads 9 of the two partial webs 8, in such a way that it is bordered by the transverse thread sections 12 at the top and bottom.
  • the filling thread 15 can be inserted in the device according to Figure 3 by removing it from a supply roll V in the same way as with the partial web strip B.
  • the filling thread 15 has the same dimensions and consists of the same material as the longitudinal threads 9. Due to the previously mentioned distance between the adjacent longitudinal threads 9, it fills the gap in such a way that the longitudinal thread density also remains unchanged in the area of the longitudinal edges 11. With the supply of the filling thread 15 or immediately afterwards, the longitudinal edges 11 are connected to one another by means of two sewing threads 16.
  • the multiaxial layer 2, 3 is designed as a flat fabric, with a fabric weave of the type weft-cross-twill 2 - 2 developed by dividing the weft repeat.
  • all longitudinal threads 9 are formed by a monofilament thread which is formed from four monofilaments with a diameter of 0.2 mm.
  • the transverse threads 10 are designed as monofilaments, being present in two different cross-sectional shapes and two different thicknesses. Specifically, the transverse threads 10 are present in two different configurations 10a, 10b.
  • the transverse threads 10a have a round cross-section with a larger diameter
  • the flat threads 10b are designed as flat threads with a rectangular cross-section, the thickness of which is less than the diameter of the round transverse threads 10a.
  • transverse threads 10a of round cross-section and the flat threads 10b are arranged alternately in the partial web longitudinal direction TL.
  • the longitudinal threads 9 or warp threads consist of PA6, PET or PEF
  • the transverse threads 10 or weft threads consist of PA6, PA6.10, PA4.10, PA11, PET or PEF.

Landscapes

  • Paper (AREA)
  • Manufacturing Of Multi-Layer Textile Fabrics (AREA)
  • Woven Fabrics (AREA)
  • Laminated Bodies (AREA)
EP23150595.9A 2022-03-15 2023-01-06 Transportband, insbesondere transferband für eine papiermaschine Pending EP4261345A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202022101383.7U DE202022101383U1 (de) 2022-03-15 2022-03-15 Transportband, insbesondere Transferband für eine Papiermaschine

Publications (1)

Publication Number Publication Date
EP4261345A1 true EP4261345A1 (de) 2023-10-18

Family

ID=81256544

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23150595.9A Pending EP4261345A1 (de) 2022-03-15 2023-01-06 Transportband, insbesondere transferband für eine papiermaschine

Country Status (4)

Country Link
EP (1) EP4261345A1 (enrdf_load_stackoverflow)
JP (1) JP7604540B2 (enrdf_load_stackoverflow)
CN (1) CN116770621A (enrdf_load_stackoverflow)
DE (1) DE202022101383U1 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202021104492U1 (de) * 2021-08-20 2021-10-06 Heimbach Gmbh Textilbahn sowie Verwendung einer solchen

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0576115A1 (en) 1992-06-11 1993-12-29 Albany International Corp. Transfer belt
DE69607708T2 (de) * 1995-09-07 2000-08-17 Albany International Corp., Albany Spiralformiges Armierungsband für Pressbänder zum Einsatz in Langspaltpresse
DE202017101585U1 (de) 2017-03-17 2017-07-04 Heimbach Gmbh & Co. Kg Transferband für eine Papiermaschine sowie Verwendung des Transferbandes in einer Papiermaschine
DE202021104492U1 (de) * 2021-08-20 2021-10-06 Heimbach Gmbh Textilbahn sowie Verwendung einer solchen

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2170976T3 (es) 1998-04-02 2002-08-16 Heimbach Gmbh Thomas Josef Banda textil especialmente utilizable como base para revestimientos de maquinas papeleras.
JP3415767B2 (ja) * 1998-04-13 2003-06-09 市川毛織株式会社 シュープレス用ベルト及びその製造方法
AU5951799A (en) 1999-07-09 2001-01-11 Albany International Corp. Multi-axial press fabric with angular web
JP2015223727A (ja) 2014-05-27 2015-12-14 ニッタ株式会社 平ベルトおよび平ベルトの製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0576115A1 (en) 1992-06-11 1993-12-29 Albany International Corp. Transfer belt
DE69607708T2 (de) * 1995-09-07 2000-08-17 Albany International Corp., Albany Spiralformiges Armierungsband für Pressbänder zum Einsatz in Langspaltpresse
DE202017101585U1 (de) 2017-03-17 2017-07-04 Heimbach Gmbh & Co. Kg Transferband für eine Papiermaschine sowie Verwendung des Transferbandes in einer Papiermaschine
DE202021104492U1 (de) * 2021-08-20 2021-10-06 Heimbach Gmbh Textilbahn sowie Verwendung einer solchen

Also Published As

Publication number Publication date
DE202022101383U1 (de) 2022-03-31
JP2023135640A (ja) 2023-09-28
CN116770621A (zh) 2023-09-19
JP7604540B2 (ja) 2024-12-23

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