EP2065515A1 - Habillage de machine à papier - Google Patents

Habillage de machine à papier Download PDF

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Publication number
EP2065515A1
EP2065515A1 EP08169476A EP08169476A EP2065515A1 EP 2065515 A1 EP2065515 A1 EP 2065515A1 EP 08169476 A EP08169476 A EP 08169476A EP 08169476 A EP08169476 A EP 08169476A EP 2065515 A1 EP2065515 A1 EP 2065515A1
Authority
EP
European Patent Office
Prior art keywords
paper machine
press felt
machine clothing
particular press
threads
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.)
Withdrawn
Application number
EP08169476A
Other languages
German (de)
English (en)
Inventor
Matthias Schmitt
Arved Westerkamp
Robert Eberhardt
Hubert Walkenhaus
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE200710047867 external-priority patent/DE102007047867A1/de
Priority claimed from DE200710055687 external-priority patent/DE102007055687A1/de
Priority claimed from DE200810001820 external-priority patent/DE102008001820A1/de
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP2065515A1 publication Critical patent/EP2065515A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/0027—Screen-cloths
    • D21F1/0054—Seams thereof

Definitions

  • the invention relates to a paper machine clothing, in particular a press felt, for use in a paper, board or Tissuemaschine.
  • Paper machine clothing is known in a wide variety of designs and applications in the art.
  • these can be in the form of endless belts as screen belts, press felt belts or conveyor belts.
  • a fundamental requirement of such press felts is to dewater the fiber web as optimally as possible and to avoid rewetting, in order to minimize the energy required for drying following the wet part.
  • the dewatering in press sections is carried out by applying pressure through the corresponding band, that is to say from the side supporting the fibrous web, which is referred to as upper or outer side with respect to their arrangement, to the opposite lower or inner side of the press felt.
  • the top forms the fibrous web side and the bottom forms the drainage side.
  • Spectra TM membrane which is essentially composed of polyurethane or other polymers and is used in a felt in the form of a porous membrane. Based on the Spectra TM membrane, this technology is proving successful in many applications. The advantages are particularly evident in terms of good drainage results, with the presses in the front area of a paper machine playing a role in the provision of large void volumes. Furthermore, markings of the paper web can be avoided. Furthermore, vibrations occurring in presses in the rear area of a paper machine can be damped, ie the Spectra TM membrane also serves as a damping layer.
  • an industrial fabric which comprises a base layer, a fiber mat layer and at least one low-melting polymeric film layer, in particular of elastomeric thermoplastic polyurethane, wherein the polymeric layer is needled together with the fiber mat layer and then subjected to a thermal treatment to the fibers at least partially encapsulate the fiber mat layer.
  • the thickness of the layer obtained is relatively large, so that also results in a high weight.
  • the press blanket for the press section of a paper machine, the press blanket comprising a multilayer, compressible, resilient structure, and having three layers of weft yarns, one of the three layers comprising multicomponent yarns, the multicomponent yarns each having a plurality of load bearing parts, while the remaining weft yarn in all three plies of monofilament yarns, the three plies of weft yarns comprising an upper layer, a middle layer and a forming lower layers, the weft yarns in the lower layer comprising monofilament yarns of larger diameter than the monofilament yarns in each of the three other layers; and a first system of warp yarns, which are monofilament yarns interwoven with warp yarns of the first system, with the weft yarns of the three layers of weft yarns in a repeating pattern so that the press fabric can be provided with an extremely fine paper-contacting surface, with an open one non-paper
  • GB 2 332 916 A a press felt for a papermaking machine comprising at least one layer of non-woven elastomeric fibers, wherein the elastomeric fibers comprise a polyetheramide block copolymer or a thermoplastic polyurethane.
  • the layer is included as a middle layer in a press felt and shows capillary drainage effect.
  • thermoplastic comprising elastomeric materials, such as high molecular weight cross-linked urethane-based elastomers, which are stretchable to at least twice their original length, and rapidly take their original length after removal of the load.
  • the invention is therefore based on the object, a papermachine fabric, in particular a press felt of the type mentioned in such a way that this in addition to a high water absorption capacity and a good Wasserweitertechnischshack by a high recoverability, ie recovery capacity or recovery of the individual fibers after Passing through a press nip, characterized and further the total weight of the felt belts can be kept as low as possible.
  • the paper machine clothing, in particular the press felt should also be designed such that the free volume can be kept constant high even under press load.
  • the invention thus relates to a paper machine clothing, in particular a press felt, comprising at least one layer in the form of a lattice structure containing or consisting of one or more vulcanized thermoplastic elastomers (TPE-V).
  • TPE-V vulcanized thermoplastic elastomers
  • the lattice structure is not particularly limited within the scope of the invention, and comprises any structure known to the person skilled in the art in the form of a grid, which can be used in a covering for a paper machine.
  • the term "lattice structure" according to the invention is understood to mean a layer which has recesses, pores or openings essentially over its entire surface, which preferably extend over the entire layer and through the entire layer.
  • a "layer” is to be understood to mean a planar formation of virtually any shape, whose extent in length and width is greater than in its thickness.
  • the recesses or openings passing through the layer will be referred to as pores.
  • the number, size and shape of the pores in the lattice structure according to the invention is not particularly limited.
  • the grid structure may have pores of the same or different shape.
  • the shape of the pores is not particularly limited in the present invention, any pore shape can be used.
  • the pores may be selected from round, trapezoidal, rhomboid, diamond, triangular, quadrangular, pentagonal, hexagonal, polygonal, oval or other suitable pore shapes.
  • the choice of the number, the distribution and the geometry of the pores depends on the desired properties to be achieved.
  • the distance between the individual pores can be set the same or different, in order to influence the desired properties of the fabric by varying the number of pores.
  • the lattice structure has a symmetrical distribution of the pores preferably over the entire layer; however, asymmetrical arrangements or locally limited arrangements on the lattice structure layer are also possible.
  • the grid structure may also have pores of different sizes.
  • the pore sizes are in a range of about 0.2 to about 2 mm 2 , preferably in the range of 0.7 to 1.3 mm 2 .
  • a plurality of lattice structures may also be combined in a layer structure which forms part of a press felt or forms the press felt itself, wherein one or more further layers may be provided above, below and / or between the present lattice structures. At least some of these layers are preferably nonwoven layers.
  • the grid structure layers may each have the same or different pore distribution, size and / or shape. This depends on the respective desired properties of the papermachine clothing, which are to be adjusted.
  • the lattice structure preferably has a basis weight in the range of about 20 g / m 2 to about 250 g / m 2 , preferably about 40 g / m 2 to about 200 g / m 2 , most preferably about 100 g / m 2 to about 200 g / m 2 on.
  • the lattice structure has a surface facing the paper side of the fabric and a side facing the machine side of the fabric. Preferably, at least one, in particular both, of these surfaces is planar.
  • the lattice structure contains or consists of a vulcanized thermoplastic elastomer ("TPE-V").
  • TPE-Vs can be two-phase systems in which in a thermoplastic phase in as finely divided as possible, a partially or completely crosslinked elastomer phase is present.
  • the thermoplastic is for example selected from a polyolefin, such as polyethylene or polypropylene, which are present as a continuous phase.
  • the elastomer present therein is selected, for example, from EPDM (ethylene-propylene-diene monomer rubber), polychloroprene latex (CR), hydrogenated nitrile butadiene rubber (HNBR), acrylate rubber (ACM) or a styrene block copolymer such as HSBC (hydrogenated styrene Block copolymer) or SEPS (styrene-ethylene / propylene-styrene triblock copolymer).
  • EPDM ethylene-propylene-diene monomer rubber
  • CR polychloroprene latex
  • HNBR hydrogenated nitrile butadiene rubber
  • ACM acrylate rubber
  • HSBC hydrogenated styrene Block copolymer
  • SEPS styrene-ethylene / propylene-styrene triblock copolymer
  • SEPS stands for a styrene-ethylene-propylene-styrene consisting of a triblock copolymer based on polystyrene end blocks, wherein the middle block consists of hydrogenated polyisoprene or hydrogenated poly (butadiene-co-isoprene).
  • the elastomer phase is chemically at least partially crosslinked. This can be done, for example, by dynamic vulcanization in a twin-screw extruder.
  • Particularly preferred elastomers are EPDM and styrene block copolymers, very particularly preferably HSBC, in particular SEPS.
  • HSBC hydrogenated styrene block copolymer
  • a comonomer can be copolymerized into the Styrolendblöcke, which allows the selective chemical crosslinking of the end blocks.
  • thermoplastic and elastomeric phase as a substructure of the elastic phase, a phase separation is formed between the hard cross-linked styrene endblocks and the soft elastic midblocks of HSBC in the nanometer range.
  • the crosslinked HSBC domains with their substructure are evenly distributed in the continuous polypropylene phase.
  • the size of the cross-linked HSBC particles is typically around 1 ⁇ m or less (please refer Kunststoffe 1, 2007, Carl Hanser Verlag Kunststoff, pp. 79-81 ).
  • This cross-linking of HSBC achieves a substantial increase in the strength of the end blocks. This produces a significantly improved restoring force of the elastic phase and an increase in the service temperature range to significantly higher temperatures, which is limited only by the melting temperature of the polyolefin.
  • Particularly preferred elastomers therefore are partially or completely crosslinked SEPS in a polyolefin matrix, in particular polypropylene matrix, which are also known as TPES-V compounds and from the company Kraiburg TPE GmbH & Co. KG (84478 Waldkraiburg, Germany) under the registered trademark Thermoplast ® V are sold.
  • PS modified polystyrene
  • TPEs Thermoplastic elastomers
  • TPE-Vs Thermoplastic elastomers
  • these compounds have particularly good temperature stability with high flexibility over a wide temperature range, very good resistance to hydrocarbons, heat, weathering and aging and show very good hysteresis behavior, combined with a low loss of sealing force when testing compression stress relaxation and a low long-term compression set.
  • TPE-Vs Known commercial products belonging to the class of TPE-Vs are, for example, OnFlex TM -V from PolyOne Th. Bergmann GmbH, 76571 Gaggenau, Germany, Santoprene TM from Exxon Mobile Chemicals, Sarlink TM from DSM, Nexprene TM and Respond TM Solvay Forprene TM from soft SpA and thermal load ® -V compounds of the company. Kraiburg TPE GmbH & Co. KG (84478 Waldkraiburg, Germany).
  • thermal load ® -V compounds of the company are used.
  • OnFlex TM -V-products of the company are. PolyOne Th. Bergmann GmbH.
  • the lattice structure is not limited according to the invention; It can also be a textile composite used.
  • This is, for example, a textile composite with spaced-apart linear filaments extending substantially in the same direction, with a polymeric composite filler joining the filaments and at least partially wrapping each filament over its entire lengthwise extent and in the polymeric composite filler Pores are provided, which are arranged laterally offset to the threads and extend through the entire composite.
  • the polymeric composite filler contains or consists of one or more of the above vulcanized thermoplastic elastomers.
  • the one or vulcanized thermoplastic elastomers is very particularly preferably selected from one of the product lines of thermal load ® -V compounds of the company. Kraiburg TPE GmbH & Co. KG or OnFlex TM -V products of the company. PolyOne Th. Bergmann GmbH.
  • the thread material is not particularly limited and may be, for example, a polymer selected from polyesters, polyamides, polyphenylene sulfides, polyaramides, polyolefins such as polypropylene or polyethylene, or other semicrystalline thermoplastics or the like. Particularly preferred is polyester.
  • the yarns may be machine direction yarns.
  • the threads may be monofilaments or monofilaments, multifilaments or multiple threads or spun threads.
  • the threads have a core-sheath structure, in particular the threads represent core-sheathed monofilaments.
  • the sheath contains or consists of one or more vulcanized thermoplastic elastomers.
  • the threads are in parallel position and the composite filler joining the threads perpendicular to the threads and also perpendicular to the filler which at least partially surrounds the threads.
  • the encapsulating composite filler may preferably form a planar surface at least on one side of the composite.
  • the polymeric composite on one side of the composite forms a surface outside each plane of the wrapped yarns.
  • the pores formed in the composite can form flow paths that are perpendicular to the main plane of the composite. Particularly preferably, the pores are arranged at equal distances from each other.
  • Shore A hardness of the lattice structure can be achieved in the range of 20 to 100, preferably 40 to 85.
  • An elongation in the range of 100 to 800%, preferably 200 to 600% can be obtained.
  • thermoplastic elastomers By using vulcanized thermoplastic elastomers (TPE-Vs) polymer compounds are used which have extremely low densities in the range of less than 1 g / cm 3 , compared to a density of commonly used thermoplastic elastomers (TPEs) of about 1.3 g / cm 3 .
  • TPE Vs particularly in the form of the elastomeric compounds of the thermal load ® -V- described or OnFlex TM -V-products combine a high temperature resistance with a low density.
  • weight reductions of at least 20% can be achieved in comparison with a conventional lattice structure, for example consisting of thermoplastic polyurethane. This means a cost reduction in production while maintaining existing manufacturing processes by at least 20%.
  • lattice structures containing or consisting of vulcanized thermoplastic elastomer in papermachine clothing, particularly preferably press felts offers the advantage that the resulting increase in the open volume ("void volume") causes a high water absorption capacity and compared to other polymers used in fabrics due to a high Elasticity a particularly good resilience after deformation is obtained.
  • the elastic behavior can be additionally influenced, in particular increased, by the selection, nature and number of lattice structures.
  • Another significant advantage is the low weight of the resulting paper machine clothing.
  • the use of the combination of geometric shape and material makes it possible to influence the properties of the papermachine fabric, in particular of a press felt, which are controllable or adjustable by the arrangement and formation of lattice structures.
  • the fibrous web can be optimally dewatered and rewetting can be avoided in order to keep the energy expenditure for the subsequent drying as low as possible.
  • the substance has a relatively low weight with very high restoring force in the z direction.
  • the paper machine clothing can be produced both with seam and as endless.
  • different properties can be set on the top and bottom of the press felt.
  • the paper machine clothing provided according to the invention to a great extent meets the requirements of a press felt: it provides a good liquid absorption capacity with low flow resistance and the largest possible free volume within the paper machine clothing for liquid absorption.
  • the lattice structure can be produced, for example, by extrusion.
  • the invention also provides a process for producing an industrial fabric for use in a papermaking fabric, in particular a press felt, comprising providing at least one lattice structure containing or consisting of one or more vulcanized thermoplastic elastomers.
  • a conventional process for the production of clothing in particular press felts, can be used with relatively slight adaptation.
  • the structure After providing and stacking the respective layers, the structure may be subjected to a usual processing step, for example by needling the structure.
  • FIG. 1 illustrates in schematic simplified representation by way of example a possible variant of the embodiment of a grid structure 10 according to the invention in a plan view.
  • the grid according to the invention contains one or more vulcanized thermoplastic elastomers.
  • the pores 15.1, 15.2 are distributed over the entire lattice structure 10.
  • the pores 15.1, 15.2 are symmetrically distributed in the illustrated case and of the same size.
  • the geometry of the opening area of the pores 15.1 and 15.2 is characterized by a combination of square areas whose orientation is parallel to the x and perpendicular to the y-axis. This does not say anything about the later orientation of the lattice structure 10 in the paper machine clothing or the press felt 2, which takes place depending on the application.
  • FIG. 2 shows in a plan view of another exemplary embodiment of the invention.
  • a grid structure 20 having, for example, machine direction yarns 25.1 and 25.2 serving as reinforcing elements.
  • the threads 25.1 and 25.2 are of the composite filler 30, containing or consisting of vulcanized thermoplastic elastomer, surrounded, wherein the threads 25.1 and 25.2 are completely enveloped and thread 25.1 is connected to thread 25.2.
  • pores 40.1, 40.2, 40.3, 40.4, 40.5, 40.6, 40.7 and 40.8 are arranged in the lattice structure 20, wherein in the example the same distances between the pores 40.1, 40.2, 40.3 and 40.4 and the pores 40.5, 40.6, 40.7 and 40.8 are present , But this does not have to be the case.
  • FIG. 3 shows a section of the FIG. 2 along the line A-A '. Shown are the conical pores 40.4 and 40.8, the threads 25.1 and 25.2 and the composite filler 30, which completely envelopes the threads 25.1 and 25.2 in the illustrated variant.
  • FIG. 4 illustrates in a schematic simplified representation of a possible embodiment of a papermachine fabric according to the invention 1 in the form of a layer structure 70, in particular a press felt 2. Shown is a grid structure 75. But it can also be provided several grating structures with the same or different basis weights and the same or different shapes Basis weight may preferably be in the range of about 20 g / m 2 to about 250 g / m 2 , preferably about 40 g / m 2 to about 200 g / m 2 , most preferably about 100 g / m 2 to about 200 g / m 2 lie. It is also possible to combine several identical lattice structures with different lattice structures.
  • the grid structure (75) can be selected in terms of pore size and shape so that the papermachine fabric 1, comprising all the layers, the desired properties of the papermachine fabric 1 provides. The actual selection depends on the required properties of the respective fabric.
  • the grid structure (75) in the example shown is constructed of one or more vulcanized thermoplastic elastomers, resulting in a significant weight reduction.
  • nonwoven layers 100.1 to 100.5 are shown, which may also be part of the papermachine clothing 1 according to the invention in the form of a layer structure 70. Particularly preferred are fibers with titers over 22 dtex. The concrete one Selection of the other layers depends on the required properties of the respective fabric.
  • FIGS. 1 to 4 illustrate exemplary possible embodiments, but are not exhaustive and therefore not restrictive with regard to the scope of protection according to the invention papermachine clothing.
  • Other possibilities of combinations in terms of structure, arrangement and structure of an industrial fabric are conceivable depending on the desired behavior.

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EP08169476A 2007-11-27 2008-11-20 Habillage de machine à papier Withdrawn EP2065515A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE200710047867 DE102007047867A1 (de) 2007-11-27 2007-11-27 Papiermaschinenbespannungen, insbesondere für Pressfilze und Verfahren zu deren Herstellung
DE200710055687 DE102007055687A1 (de) 2007-12-03 2007-12-03 Industriestoff zur Verwendung in einer Papiermaschinenbespannung, insbesondere als Pressfilz
DE200810001820 DE102008001820A1 (de) 2008-05-16 2008-05-16 Industriestoff zur Verwendung in einer Papiermaschinenbespannung, insbesondere als Pressfilz

Publications (1)

Publication Number Publication Date
EP2065515A1 true EP2065515A1 (fr) 2009-06-03

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EP08169476A Withdrawn EP2065515A1 (fr) 2007-11-27 2008-11-20 Habillage de machine à papier

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EP (1) EP2065515A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111806034A (zh) * 2020-06-22 2020-10-23 四川环龙技术织物有限公司 一种造纸压榨毛毯
CN111806033A (zh) * 2020-06-22 2020-10-23 四川环龙技术织物有限公司 一种造纸压榨毛毯

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1979000312A1 (fr) 1977-11-21 1979-06-14 Nordiskafilt Ab Feutre a calandrer a haute elasticite
DE2857206A1 (de) 1977-11-21 1980-12-18 A Gladh High-elasticity press felt
US4740409A (en) 1987-03-31 1988-04-26 Lefkowitz Leonard R Nonwoven fabric and method of manufacture
US5508094A (en) 1991-12-18 1996-04-16 Albany International Corp. Press fabrics for paper machines
DE69217467T2 (de) 1991-12-18 1997-08-07 Albany Int Corp Pressfilze für Papiermaschine
GB2332916A (en) 1997-12-31 1999-07-07 Scapa Group Plc Papermaking press felt with elastomer fibre layer
EP1127976A2 (fr) 2000-02-23 2001-08-29 Voith Fabrics Heidenheim GmbH & Co.KG Bande pour machine à papier
WO2003076046A2 (fr) 2002-03-09 2003-09-18 Voith Fabrics Heidenheim Gmbh & Co. Kg Tissus industriels

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1979000312A1 (fr) 1977-11-21 1979-06-14 Nordiskafilt Ab Feutre a calandrer a haute elasticite
DE2857206A1 (de) 1977-11-21 1980-12-18 A Gladh High-elasticity press felt
US4740409A (en) 1987-03-31 1988-04-26 Lefkowitz Leonard R Nonwoven fabric and method of manufacture
EP0285376B1 (fr) 1987-03-31 1993-01-27 Leonard Robert Lefkowitz Etoffe non tissée et son procédé de fabrication
US5508094A (en) 1991-12-18 1996-04-16 Albany International Corp. Press fabrics for paper machines
DE69217467T2 (de) 1991-12-18 1997-08-07 Albany Int Corp Pressfilze für Papiermaschine
GB2332916A (en) 1997-12-31 1999-07-07 Scapa Group Plc Papermaking press felt with elastomer fibre layer
EP1127976A2 (fr) 2000-02-23 2001-08-29 Voith Fabrics Heidenheim GmbH & Co.KG Bande pour machine à papier
WO2003076046A2 (fr) 2002-03-09 2003-09-18 Voith Fabrics Heidenheim Gmbh & Co. Kg Tissus industriels
EP1485183A2 (fr) 2002-03-09 2004-12-15 Voith Fabrics Heidenheim GmbH & Co.KG Tissus industriels

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Kunststoffe 1", 2007, CARL HANSER VERLAG, pages: 79 - 81
CORAN, A.Y. ET AL.: "Thermoplastic Elastomers", 1996, CARL HANSER VERLAG, pages: 160

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111806034A (zh) * 2020-06-22 2020-10-23 四川环龙技术织物有限公司 一种造纸压榨毛毯
CN111806033A (zh) * 2020-06-22 2020-10-23 四川环龙技术织物有限公司 一种造纸压榨毛毯

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