WO2011036164A1 - Bande de séchage pour un dispositif de séchage par condensation - Google Patents

Bande de séchage pour un dispositif de séchage par condensation Download PDF

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Publication number
WO2011036164A1
WO2011036164A1 PCT/EP2010/063941 EP2010063941W WO2011036164A1 WO 2011036164 A1 WO2011036164 A1 WO 2011036164A1 EP 2010063941 W EP2010063941 W EP 2010063941W WO 2011036164 A1 WO2011036164 A1 WO 2011036164A1
Authority
WO
WIPO (PCT)
Prior art keywords
drying
drying belt
contact
polymer
layer
Prior art date
Application number
PCT/EP2010/063941
Other languages
German (de)
English (en)
Inventor
Uwe Köckritz
Original Assignee
Voith Patent Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Voith Patent Gmbh filed Critical Voith Patent Gmbh
Publication of WO2011036164A1 publication Critical patent/WO2011036164A1/fr

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00—Dryer section of machines for making continuous webs of paper
    • D21F5/004—Drying webs by contact with heated surfaces or materials
    • 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 invention relates to a drying belt for a condensation drying device and to a machine for producing and / or processing web material, such as paper, board or tissue, with a condensation drying device.
  • a condensation drying device of a paper machine moisture is removed from the web material to be produced by heating the web material from one side and cooling it from the other side.
  • the heating evaporates liquid contained in the web material.
  • the liquid vapor exits the web material and condenses outside the web material by cooling.
  • the web material on one side is in contact with a very finely structured drying belt, which is permeable to the liquid or liquid vapor emerging from the web material.
  • a coarse textured drying belt is provided, whose function is primarily the absorption or storage of the liquid vapor or the condensed liquid.
  • a heat sink is provided, for example in the form of a locally cooled, non-liquid-impermeable sealing tape.
  • the other side of the web material is in contact with a heat source, for example a heated, non-liquid-permeable band or a drying cylinder heated in the region of its lateral surface, over which the web material is guided.
  • a heat source for example a heated, non-liquid-permeable band or a drying cylinder heated in the region of its lateral surface, over which the web material is guided.
  • None of the known drying belts for condensation drying equipment connects a sufficiently smooth web material contact side with a sufficiently high water storage volume.
  • no drying belts are known, with which graphic paper can be produced without markings.
  • Even the drying belts proposed in DE 10 2006 039 102 with one provided by a non-woven fabric Webmate contact page, are not suitable for the production of sophisticated graphic papers such as copy paper.
  • the invention is achieved by a drying belt for a condensation drying device in a web material, such as paper, board or tissue, producing and / or processing machine, with a dimensional stability of the band substantially providing the basic structure formed from high temperature resistant thread material.
  • the drying belt further comprises a nonwoven fabric disposed on the base structure and substantially providing the water absorption capacity of the belt, which provides a web material contact side of the drying belt on its outer side facing away from the base structure.
  • the nonwoven fabric consists of at least two nonwoven fabric layers, a contact layer in contact with the web material, consisting of a first polymer material mixture having a first fibrous structure densified and smoothed by hot calendering above the melting temperature, at least one polymer material, and at least a bonding layer of a second polymer material mixture having a second fibrous structure which forms a bond between the contact layer and the base structure.
  • the idea of the invention is to provide a drying belt with a porous nonwoven fabric layer, which on the one hand has a smooth and therefore marking-free web. material contact side and on the other hand has a sufficiently high water absorption capacity and which is also suitable for use in a Kondensationstrocknungs- device in terms of thermal stability and dimensional stability.
  • the nonwoven fabric layer has at least in the region of the contact layer a first polymer material mixture having a first fiber structure which has been first melted by hot calendering, ie exposure to temperature and pressure and subsequent cooling and then solidified again, becomes a drying belt with a smooth and therefore label-free Web material contact side provided.
  • the drying belt furthermore having a connecting layer of a second polymer material mixture with a second fiber structure arranged between the basic structure and the contact layer, a drying belt having a sufficiently high water absorption capacity is provided.
  • the basic structure providing the dimensional stability of the strip is formed from high-temperature-resistant thread material provides a drying belt which has good dimensional stability in its machine direction and in its cross-machine direction even at high temperature and high ambient humidity, as occurs in a condensation drying device.
  • the basic structure of a spiral wire which preferably consists of PET thread material.
  • other thread materials which have a temperature resistance of at least 150 ° C., such as the thread material comprising PCTA and / or PCT and / or PEEK and / or PPS and / or high-temperature resistant PA can be used.
  • a further embodiment of the invention further provides that the polymer material mixture of the nonwoven layers at least from a first polymer material and at least one second polymer material having a higher melting temperature than the first Polymer material is formed and the nonwoven fabric layer in the region of the BrumaterialKeyseite providing outside by hot calendering above the melting temperature of the first polymer material and below the melting temperature of the at least one second polymer material is compacted and smoothed.
  • the first polymer material and the second fibrous polymer material are mixed with each other during hot calendering, at least in the region of the contact layer, ie after re-solidification of the first polymer material, the fibers formed from the second polymer material are at least partially in the first polymer material embedded and glued together by means of this at least in sections and / or connected.
  • the first polymer material and the second fibrous polymer material form a porous composite structure at least in the region of the contact layer.
  • a further possible embodiment of the invention provides that the layers of the fiber fleece consist of polymer fiber mixtures which differ in that the melting temperature of the fibers which are intended to melt during hot calendering / fixing becomes progressively lower from layer to layer. This is the only way to ensure that the polymer fibers, which are farther away from the calendered surface of the contact layer, are also melted correctly and that the layers become chemically anchored to one another and to the base fabric.
  • the drying tape preferably having a water absorption capacity of 10-250 g per m 2 per second, especially 15-200 g per m 2 per second, to be optimal Drying belt to be able to work in a condensation drying device.
  • the drying belt is permeable to water and water vapor and preferably has a permeability of from 1 to 200 cfm, more preferably from 10 to 95 cfm.
  • the Contact surface of the contact layer of the drying tape has a roughness Rz of less than 2.4 ⁇ .
  • Rz are in the range of 0.1 ⁇ to 20 ⁇ , in particular 0.6 ⁇ to 6 ⁇ according to DIN EN ISO 4287, DIN EN ISO 4288.
  • the last mentioned roughnesses can be easily achieved, in particular, when the contact surface of the nonwoven fabric layer is cooled below the melting temperature of the polymer of the filling material while the contact surface is guided under pressure over a smooth surface.
  • the polymer material mixture is preferably in the form of fibers in the fibrous nonwoven layers, it also being possible for particulate polymer material to be present in the polymer material mixture before the melting, which are arranged in particular between the fibrous material. It is conceivable here that particulate filling material is introduced into the nonwoven fabric in the area of the contact layer of the nonwoven fabric and subsequently melted during hot calendering, whereby the higher melting polymer fibers in the contact layer area are embedded in the polymer material and adhesively bonded thereto.
  • a further preferred embodiment of the invention provides that a nonwoven fabric layers comprise or are formed by bi-component fibers, wherein before the hot calendering, the first polymer material is present as a component and the second polymer material as second component of the bi-component fibers.
  • a smooth and porous composite structure of the second fibrous polymer material and the first polymer material is thereby produced in the area of the contact layer, in which the polymer fibers are embedded in the first polymer material at least in sections.
  • an area formed by the unfused bi-component fibers is formed between the outside and the base structure.
  • the bi-component fibers may in this case be used, for example, as core-sheath fibers or as silk-sheath fibers. te side fibers are present.
  • the first polymeric material preferably forms the sheath and the second polymeric material preferably forms the core.
  • the first polymer may be a thermoplastic, in particular a copolyamide.
  • the co-polyamide can be composed of at least two different monomers from the group of caprolactam, laurolactam, dicarboxylic acids having 4-12 C atoms, terephthalic acid, isophthalic acid, dimer acid with C atoms, linear alpha-omega-diamines having 2-1 2 C atoms and 2-methylpentamethylenediamine.
  • the above-mentioned first polymers have, for example, a melting temperature of 110 ° C. or more.
  • the second polymer material may be a thermoplastic, in particular a polyamide.
  • the polyamide may be from the group polyamide 6, polyamide 46, polyamide 66, polyamide 12, polyamide 1 1, polyamide 6T / 66, polyamide 6T / 6, polyamide 6T / 61 or polyamide 12T.
  • Another possibility for influencing the porosity of the fiber fleece layers is the choice of different fiber finenesses.
  • the porosity in the individual layers can be controlled.
  • At least one layer of the fiber fleece consists of a polymer film or a polymer membrane.
  • the contact surface of the contact layer are made particularly smooth or in addition to the mechanical anchoring of the fibers a particularly good chemical bonding can be achieved.
  • the first polymer material is more or less melted and shaped, which in turn allows the compaction and the smoothness of the nonwoven fabric layer to be adjusted in a targeted manner in the region of its outer side providing the web material.
  • a possible embodiment of the invention provides that the outside was performed during hot calendering over a heated smooth surface.
  • the outside was guided on cooling from a temperature above the melting temperature to a temperature below the melting temperature of the first polymer material under pressure over a smooth surface.
  • the topography of the outside of the nonwoven fabric layer is frozen in the state that it has when passing over the cooling surface, wherein the smoothness of the outside of the material layer is determined or at least substantially influenced by the smoothness of the surface during cooling.
  • at least one nonwoven fabric layer is arranged between the contact layer and the basic structure, the fiber-forming polymer material of which has a higher melting temperature than the fibers in the contact layer.
  • At least one nonwoven fabric layer is arranged on the side of the basic structure facing away from the web material contact side, with whose fiber materials an additional chemical anchorage can be realized in addition to the mechanical anchoring.
  • a machine for the production and / or processing of web material, such as paper, board or tissue, with a condensation drying device with at least one heatable drying cylinder, the lateral surface in a wrap of the web material, a drying belt after one of the preceding claims and a water and vapor impermeable sealing strip is wrapped, and with a cooling medium whose temperature is lower than the temperature of the lateral surface of the drying cylinder, wherein in Umschlingungs Scheme one side of the web material in contact with the outer surface of the drying cylinder and the other the side of the web material is in contact with the contact side of the drying belt, while the machine contact surface of the drying belt is in contact with one side of the sealing belt, the other side of which is acted upon by the cooling medium.
  • a condensation drying device with at least one heatable drying cylinder, the lateral surface in a wrap of the web material, a drying belt after one of the preceding claims and a water and vapor impermeable sealing strip is wrapped, and with a cooling medium whose temperature is lower than
  • an overpressure hood which is open towards the sealing strip is arranged, which, in interplay with the sealing strip, provides a closed space in which the cooling medium, in particular under pressure, is guided.
  • the cooling medium may be a liquid or a gas. It is also a liquid-gas mixture conceivable as a cooling medium.
  • the drying belt according to the invention is particularly advantageously used in the condensation drying device when the web material is fed into the condensation drying device at a dry content in the range of 50-80%, since in this dry content range the paper is still easily moldable and therefore sensitive to marking by the clothing is.
  • the web material guided in the condensation drying device in particular in the case of the abovementioned dry content, is not only used in this process. dries but also smoothed.
  • FIG. 1 shows a first embodiment of a drying belt according to the invention
  • FIG. 2 shows a detail of a drying belt according to the invention with bicomponent fibers
  • FIG. 3 shows a detail of a drying tape according to the invention with a film cover layer
  • Figure 4 shows an embodiment of a machine according to the invention for the production of sheet material with a condensation drying device.
  • FIG. 1 shows a drying belt 1 according to the invention in cross-section.
  • the drying belt 1 has a woven basic structure 2 substantially providing the dimensional stability of the belt 1, which is formed from PET or a similar high-temperature-resistant fiber material 4.
  • the drying belt 1 furthermore comprises a nonwoven fabric layer 4, which is arranged on the base structure 2 and essentially provides the water absorption capacity of the belt 1, and which comprises two layers of the contact layer 6 and the connecting layer 7.
  • the contact layer 6 with the contact surface 5 produced by calendering is presently formed by a first polymer material 12, 14 and by a second polymer material 10, 15, wherein the first polymer material 12 has a lower melting temperature than the second polymer material 15, so that a compound the polymer materials formed during hot calendering.
  • the nonwoven layers 6, 7 are heat-calendered at a temperature above half the melting temperature of the first polymer material 12, 14 and below the melting temperature of the second polymer material 10, 15 compacted and smoothed.
  • the fiber composition 10, 12 of the layers may be as follows:
  • the layer consists of a different composition of the first and second polymer materials 10, 15, 12, 14, which are always arranged over the entire nonwoven fabric layer thickness 6, 7 per layer.
  • the composition is chosen so that the heat transfer through the layers is taken into account and thus a sufficient or desired chemical anchoring of the fibers takes place.
  • the porosity of the fiber fleece layer 4 increases in the present case from the contact surface 5 providing outer side 6 in the direction of the basic structure 2.
  • FIG. 2 shows a detail of a drying belt according to the invention with bi-component fibers.
  • a contact layer is provided which is formed by Bi-component fibers 13, in which a first component -bspw. the jacket - through the first polymer 14 and a second component -bspw. the core - of the bi-component fibers 13v is formed by the second polymer material 15.
  • This untreated fibrous web was hot calendered at a temperature above the melting temperature of the first and below that of the second polymeric material 14, 15 - i. the first polymer material 14 has been melted, the second polymer material 15 is not and subsequently cooled to a temperature below the melting temperature of the first polymer material 14.
  • the contact layer 6 is formed by a foil or membrane of polymer material.
  • the first polymer material 14, at least in the region of the outside 6, forms a discontinuous polymer layer 12, in which the second polymer material 14 present as fibers 15 is embedded at least in sections.
  • the first and second polymer materials 14, 15 are still present as single fibers or bi-component fibers 13 which are needled only.
  • the drying belts 1 shown in FIGS. 1, 2 and 3 have a water absorption capacity of 10-250 g per m 2 per second, in particular 15-200 g per m 2 per second. Furthermore, the drying belts 1 are permeable to water and water vapor.
  • the roughness Rz of the web material contact pages 5 of the drying tapes 1 shown in Figures 1, 2 and 3 is preferably in the range of 0.6 to 6 ⁇ according to DIN EN ISO 4287, 4288th
  • FIG. 4 shows part of a machine according to the invention for producing and / or processing web material, such as, for example, paper, in particular graphic paper, such as copy paper, in the region of a condensation drying device 30.
  • web material such as, for example, paper, in particular graphic paper, such as copy paper
  • the condensation drying device 30 has at least one heatable drying cylinder 31, its jacket surface 32 in a looping region BC of a web material, such as paper 33, a drying belt 1 as described in FIGS. 1-3 and a sealing tape impermeable to water and steam 34 is entwined.
  • the sealing tape 34 is formed as a metal band.
  • the belts 1, 34 are guided over a number of rollers and rollers 38, 39.
  • the condensation drying device 30 further comprises a cooling medium 35, the temperature of which is lower than the temperature of the jacket surface 32 of the drying cylinder 31.
  • one side of the web material 33 is in direct contact with the jacket surface 32 of the drying cylinder 31 and the other side of the web material 33 is in direct contact with the web material contact side 6, 106 of the drying belt 1 while the machine contact side of the drying belt 1 is in is in direct contact with one side of the sealing band 34, the other side is acted upon by the cooling medium 35.
  • the web material 33 is heated on the one hand, whereby liquid evaporates from the web material 33 and enters the drying belt 1.
  • the sealing tape 34 is cooled by the cooling medium 35.
  • an overpressure hood 36 which is open towards the sealing band 34 is arranged above the sealing band 34, which in interaction with the sealing band 34 provides a closed space 37 in which the gas and / or gas under pressure or liquid keitsförmige cooling medium 35 is guided, which exerts pressure on the web material 33.
  • the condensation drying device 30 is arranged at a location in the machine at which the web material 33 is fed into the condensation drying device 30 with a dry content in the range of 50-80%. As a result of the pressurization and heat action in the condensation drying device 30, the web material 33 in the condensation drying device 30 is dried and smoothed.
  • condensation drying device 30 is arranged in the web running direction L after the press section, wherein in particular the web material 33 is fed into the condensation drying device 30 with a dry content of about 50-60%.

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Abstract

L'invention divulgue une bande de séchage (1) pour un dispositif de séchage par condensation dans un matériau de bande, tel qu'une machine fabriquant et/ou traitant du papier, du carton ou du tissu, avec une structure de base (2) fournissant principalement la stabilité de dimension de la bande, formée à partir de matériau de fil (3) résistant à des températures élevées. La bande de séchage (1) comprend également un non-tissé fibreux (4) disposé sur la structure de base (2) et fournissant pour l'essentiel la capacité d'absorption d'eau de la bande, lequel non-tissé fournit sur son côté extérieur partant de la structure de base un côté de contact avec le matériau de bande (5) de la bande de séchage (1), le non-tissé fibreux (4) étant à base d'au moins deux couches (6, 7), d'une couche de contact (6), qui est en contact avec le matériau de bande, constitué d'un premier mélange de matériau polymère avec une première structure de fibre, qui est comprimée et lissée par calandrage à chaud au-dessus de la température de fusion, d'au moins un matériau polymère, et au moins une couche de liaison (7), à base d'un second mélange de matériau polymère avec une seconde structure de fibre, qui forme une liaison entre la couche de contact (6) et la structure de base (2).
PCT/EP2010/063941 2009-09-22 2010-09-22 Bande de séchage pour un dispositif de séchage par condensation WO2011036164A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009029649.2 2009-09-22
DE200910029649 DE102009029649A1 (de) 2009-09-22 2009-09-22 Trocknungsband für eine Kondensationstrocknungseinrichtung

Publications (1)

Publication Number Publication Date
WO2011036164A1 true WO2011036164A1 (fr) 2011-03-31

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PCT/EP2010/063941 WO2011036164A1 (fr) 2009-09-22 2010-09-22 Bande de séchage pour un dispositif de séchage par condensation

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DE (1) DE102009029649A1 (fr)
WO (1) WO2011036164A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005098128A1 (fr) * 2004-04-08 2005-10-20 Ems Chemie Ag Feutre pour machines a papier et procede et dispositif permettant de le produire
DE102006039102A1 (de) 2006-08-19 2008-02-21 Voith Patent Gmbh Trockenband für eine Trockensektion einer Maschine zur Herstellung von Bahnmaterial, insbesondere Papier oder Karton
EP2072667A1 (fr) * 2007-12-21 2009-06-24 Voith Patent GmbH Bande pour une machine destinée à la fabrication de matériaux en bande et procédé de fabrication d'une telle bande
EP2072668A1 (fr) * 2007-12-21 2009-06-24 Voith Patent GmbH Bande pour une machine destinée à la fabrication de matériaux en bande et procédé de fabrication d'une telle bande

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005098128A1 (fr) * 2004-04-08 2005-10-20 Ems Chemie Ag Feutre pour machines a papier et procede et dispositif permettant de le produire
DE102006039102A1 (de) 2006-08-19 2008-02-21 Voith Patent Gmbh Trockenband für eine Trockensektion einer Maschine zur Herstellung von Bahnmaterial, insbesondere Papier oder Karton
EP2072667A1 (fr) * 2007-12-21 2009-06-24 Voith Patent GmbH Bande pour une machine destinée à la fabrication de matériaux en bande et procédé de fabrication d'une telle bande
EP2072668A1 (fr) * 2007-12-21 2009-06-24 Voith Patent GmbH Bande pour une machine destinée à la fabrication de matériaux en bande et procédé de fabrication d'une telle bande

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Publication number Publication date
DE102009029649A1 (de) 2011-03-24

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