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EP3167115B1 - Machine for the production of a fiber web - Google Patents

Machine for the production of a fiber web Download PDF

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Publication number
EP3167115B1
EP3167115B1 EP15710756.6A EP15710756A EP3167115B1 EP 3167115 B1 EP3167115 B1 EP 3167115B1 EP 15710756 A EP15710756 A EP 15710756A EP 3167115 B1 EP3167115 B1 EP 3167115B1
Authority
EP
European Patent Office
Prior art keywords
press
drying cylinder
machine
shoe
press nip
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.)
Active
Application number
EP15710756.6A
Other languages
German (de)
French (fr)
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EP3167115A1 (en
Inventor
Thomas Scherb
Ronaldo Parucker
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Voith Patent GmbH
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Voith Patent GmbH
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Publication date
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Publication of EP3167115A1 publication Critical patent/EP3167115A1/en
Application granted granted Critical
Publication of EP3167115B1 publication Critical patent/EP3167115B1/en
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • 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
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/0209—Wet presses with extended press nip
    • D21F3/0218—Shoe presses
    • 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
    • D21F5/02—Drying on cylinders
    • D21F5/021—Construction of the cylinders

Definitions

  • the invention relates to a machine for producing a fibrous web, in particular a tissue or tissue paper web or a single-sided smooth fibrous web, comprising at least one press nip formed between a press shoe comprising a press shoe and a drying cylinder, through which a water-absorbent carrier tape, a water-impermeable press belt and the fibrous web passed are, wherein the drying cylinder comprises a cylindrical part and the end face in each case a front cover.
  • the invention also relates to a method for producing a fibrous web, in particular a tissue or tissue paper web or a single-sided smooth fibrous web.
  • Machines of this type are known. This is how the document describes DE 19860687 A1
  • a machine with a press nip formed between a shoe press unit and a drying cylinder for dewatering tissue webs It is proposed to use a short press shoe in order to achieve a higher maximum pressure in the press nip at a maximum allowable Yankee cylinder line load of 90kN / m. This achieves a higher dry content after the shoe press unit.
  • the document US2010 / 0000696 A1 describes a structured tape intended for producing a structured fibrous web in a machine.
  • the machine comprises a shoe press nip formed between a shoe press roll having a press shoe and a Yankee drying cylinder.
  • the fibrous web is guided on the structured band through the shoe press nip, structured and transferred to the cylindrical surface of the Yankee drying cylinder for drying.
  • the object of the invention is to improve machines of this type and methods for producing such fibrous webs in terms of drying efficiency and cost-effectiveness.
  • a machine for producing a fibrous web, in particular a tissue or hygienic paper web or a unilaterally smooth fibrous web, with at least one press nip formed between a shoe press unit comprising a press shoe and a steam-heated drying cylinder, through which a water-absorbing carrier tape water-impermeable press belt and the fibrous web are passed, wherein the drying cylinder comprises a cylindrical part and the end face each having a front cover, immediately after the press nip the fibrous web is transferred to the hot surface of the cylindrical part of the steam-heated drying cylinder and dried and wherein the cylindrical part of the drying cylinder at least partially made of steel consists.
  • the water-absorbing carrier tape is designed as a felt belt and that the cylindrical part of the drying cylinder has a coating.
  • the heat flow to the fibrous web can be increased for more efficient dewatering compared to a cast iron drying cylinder.
  • the drying cylinder is exposed during operation mechanical and thermal loads.
  • the mechanical loads are essentially composed of the vapor pressure inside the drying cylinder and the pressure of the shoe press unit. Thermal stress results from the heating and the different thermal conditions between the center of the drying cylinder and the two edge zones.
  • the use of steel instead of cast iron requires lower safety margins in the strength-appropriate dimensioning.
  • the resulting higher mechanical load capacity of the steel drying cylinder allows higher line forces through the shoe press unit.
  • the wall thickness at the same mechanical load by the internal pressure of the steam-heated drying cylinder can be made thinner than cast iron cylinder. This leads to a lower heat conduction resistance and to a higher heat flow.
  • the vapor pressure inside the drying cylinder can be increased. This allows higher temperatures to be achieved. This also leads to a higher heat flow and increased dewatering of the fibrous web. Due to the invention thus higher dry contents can be achieved after the press nip and the paper production can be increased by increasing the machine speed.
  • the machine is particularly suitable for making light weight papers such as tissue papers or plain papers.
  • the basis weight is in the range of less than 45 g / m 2 , in particular less than 30 g / m 2 , preferably less than 25 g / m 2 .
  • a preferred basis weight range is between 11 g / m 2 and 45 g / m 2 .
  • the drying cylinder has a creping doctor for creping the fibrous web. The compression results in a higher specific volume and a higher softness.
  • no creping doctor is provided, however a cleaning scraper for keeping clean the drying cylinder surface of the cylindrical part. This is very smooth and has a coating, such as a coating of chrome. The smoothness of the drying cylinder surface facing side of the fibrous web is thereby increased.
  • the drying cylinder may also comprise an outer coating of the cylindrical part of metallic or ceramic material for the production of tissue paper.
  • the water-absorbing carrier tape is designed as a felt belt.
  • the press nip formed in the web running direction has a length of less than 125 mm, in particular less than 80 mm, preferably less than 70 mm, in particular less than 60 mm.
  • a higher maximum pressing pressure in the press nip can be achieved for a given maximum line force.
  • the pressure curve has over the press nip length in the web running direction, by specifying a maximum length of the press nip, a steep rise and a steep drop, whereby the fibrous web is only briefly applied to the high maximum pressing pressure. The fibrous web is not compacted thereby. The specific volume thus remains almost intact.
  • the press shoe is pressed against the drying cylinder to form the press nip. It is advantageous if the press shoe made of metal, in particular bronze or aluminum. This achieves a uniform pressure profile in the transverse direction of the machine as well as in the web running direction. This in turn results in improved transverse moisture profiles and longitudinal moisture profiles in the fibrous web and thus improves the quality of the fibrous web produced.
  • the shoe press unit comprises at least two, each extending in the transverse direction and in the web running direction side by side, pressing elements for pressing the press shoe against the drying cylinder.
  • the pressing elements can each be designed, for example, as pressure hoses.
  • the pressure hoses are preferably independently pressurizable.
  • the profile of the pressing pressure in the web running direction can be adapted to the given production conditions.
  • the maximum pressing pressure itself and also its position in the web running direction can be set exactly.
  • the second contact pressure element considered in the web running direction is pressed more strongly than the first contact pressure element.
  • the exact adjustment of the compression pressure profiles in the transverse direction and in the web running direction is particularly at high heat flux densities, as they are possible by using a drying cylinder made of steel, an advantage.
  • the pressing elements extend substantially over the entire press nip in the transverse direction, but at least in the region of the fibrous web width. Additional pressing elements in the edge regions of the press nip can be avoided.
  • the press shoe at least in the region of the press nip, has an average press shoe thickness which is equal to or less than 20 mm, in particular equal to or less than 18 mm, preferably equal to or less than 16 mm.
  • This has the advantage that the pressing pressure profile in the transverse direction, in particular in the edge regions of the press nip, runs uniformly and constantly.
  • the effects of geometric variations of the drying cylinder, for example in the edge regions due to the vapor pressure and the different thermal conditions between the drying cylinder center and the two edge zones can be compensated.
  • the flexible soft press shoe can conform to the contour of the drying cylinder during operation of the machine.
  • the press shoe thickness in the web running direction is not quite constant. Approximately in the middle of the press nip the press shoe thickness is thereby slightly thinner than at the beginning and at the end of the press nip.
  • the median press shoe thickness is therefore the average of the values of the press shoe thickness at the beginning, in the middle and at the end of the press nip.
  • the press shoe at least in the region of the press nip, has an average press shoe thickness which is equal to or greater than 10 mm, in particular equal to or greater than 12 mm, preferably equal to or greater than 14 mm.
  • the press shoe thus has a minimum thickness, which on the one hand enables a uniform pressure profile in the web running direction over the entire press nip. This resulting minimum bending stiffness ensures a constant position of the press nip end in the web running direction over the entire width of the press nip in the transverse direction. Due to the sharp limitation of the press-nip end, a very strong and even over the width constant pressure drop of the pressing pressure at the end of the press nip can be achieved.
  • a rewetting of the fibrous web by the water-absorbing carrier tape at the end of the press nip can be avoided or at least greatly reduced.
  • the Drainage efficiency is thereby increased considerably. Moisture streaks in the fibrous web due to uneven remoistening can be avoided by the high and constant width pressure drop.
  • the drying cylinder is associated with a drying hood for impinging the fibrous web with steam and / or hot air.
  • the drying cylinder expediently has a diameter of more than 3 m, in particular more than 4 m, and the interior is filled with steam at a pressure equal to or greater than 0.5 MPa (5 bar), in particular equal to or greater than 0.6 MPa (6 bar), preferably of equal to or greater than 0.7 MPa (7 bar) acted upon.
  • the drying cylinder can advantageously be so charged with steam that the surface temperature of the cylindrical part on the outside after the creping doctor or after removal of the fibrous web is more than 100.degree. C., in particular more than 120.degree.
  • This temperature level reduces the viscosity of the water contained in the fibrous web in the press nip to optimum values.
  • the end covers have a thermal insulation on the outside and / or on the inside. This reduces heat losses and improves the energy balance.
  • the shoe press unit is assigned a safety device for controlling the control of the press nip, the control unit, in the absence of the fibrous web on the water-absorbent carrier tape, causing the press elements to be deactivated and / or the shoe press unit to be swung off. Damage to or impairment of the water-absorbing carrier tape or the water-impermeable press belt can be avoided.
  • the press shoe with a line force of equal to or more than 90 kN / m, in particular equal to or more than 110 kN / m, preferably equal to or more than 120 kN / m can be pressed against the drying cylinder.
  • the drying cylinder is designed and dimensioned in a preferred embodiment so that it can be acted upon by a line force between 60 kN / m and 140 kN / m, preferably between 60 kN / m and 120 kN / m.
  • the drying cylinder advantageously has grooves on the inside of the cylindrical part for increasing the mechanical stability and increasing the heat flow.
  • the wall thickness of the cylindrical part of the drying cylinder is, without consideration of optional grooves, expediently less than 55 mm, preferably less than or equal to 45 mm.
  • the pressure profile resulting in the press nip in the web running direction at the end of the press nip has a pressure drop of more than 800 kPa / mm, in particular more than 1000 kPa / mm, preferably more than 1100 kPa / mm. This minimizes or prevents rewetting of the fibrous web by the water-absorbing carrier tape.
  • the machine comprises a headbox, a peripheral outer sieve, a circulating water-absorbing carrier tape, wherein the headbox emits a pulp suspension between the rotating outer sieve and the circulating water-absorbing carrier tape in the form of a jet, and the outer sieve and the water-absorbing carrier tape partially wrap around a forming roller and wherein the fiber suspension is dewatered in the looping area and the formed fibrous web is guided on the water-accepting carrier belt for further dewatering over an evacuated roller and through the press nip.
  • the headbox emits a pulp suspension between the rotating outer sieve and the circulating water-absorbing carrier tape in the form of a jet
  • the outer sieve and the water-absorbing carrier tape partially wrap around a forming roller and wherein the fiber suspension is dewatered in the looping area and the formed fibrous web is guided on the water-accepting carrier belt for further dewatering over an evacuated roller and through the press nip.
  • the object is also achieved by a method according to claim 17 for producing a fibrous web, in particular a tissue or tissue paper web or a single-sided smooth fibrous web.
  • the fibrous web and a water-absorbing carrier tape, and a water-impermeable press belt are passed through at least one press nip formed between a shoe press unit comprising a press shoe and a drying cylinder, wherein the drying cylinder comprises a cylindrical part and an end cap on the front side.
  • the cylindrical part of the drying cylinder is at least partially made of steel.
  • FIG. 1 a machine 1 according to the invention is shown using the example of a known crescent former.
  • the usual Sauganpresswalze is replaced by a shoe press unit 5.
  • the drying cylinder 7 is associated with a creping doctor as it is commonly used for the production of creped tissue papers.
  • This machine 1 is also suitable for the production of one-sided smooth papers with small modifications.
  • no creping doctor is provided. It is replaced by a cleaning scraper to keep clean the drying cylinder surface of the cylindrical part 8.
  • This is very smooth and preferably has a coating, such as a coating of chromium. In this case, the fibrous web 2 produced is drawn off the drying cylinder surface 8 in free tension.
  • the machine 1 comprises a headbox which emits a fibrous suspension between a peripheral outer sieve and a circulating water-absorbing carrier band 11 in the form of a jet.
  • the water-absorbing carrier tape 11 is designed as felt.
  • the outer screen and the felt 11 partially wrap around a forming roller.
  • the pulp suspension is dewatered and the formed fibrous web 2 lying on the felt 11 is guided for further dewatering over an evacuated roll and through the press nip 10.
  • the press nip 10 is formed by a press shoe 6 comprising a shoe press unit 5 and the drying cylinder 10. Immediately after the press nip 10, the fibrous web 2 is transferred to the hot surface of the cylindrical part 8 of the steam-heated drying cylinder 7 and dried.
  • the drying cylinder 7 is partially surrounded by a drying hood 14 for impinging the fibrous web 2 with steam and / or hot air. Thereafter, the fibrous web 2 is creped by a creping doctor and removed from the surface of the cylindrical portion 8 of the steam-heated drying cylinder 7 and fed via a measuring frame for measuring quality parameters of the fibrous web 2 of the reeling.
  • the shoe press unit 5 comprises two, each in the transverse direction 4 extending and in the web running direction 3 juxtaposed, pressing elements (13.1, 13.2) for pressing the press shoe 6 against the drying cylinder 7.
  • the pressing elements (13.1, 13.2) are designed as pressure hoses.
  • the pressure hoses are pressurized independently of each other.
  • the profile of the pressing pressure in the web running direction 3 can be adapted to the given production conditions.
  • the maximum pressing pressure itself and also its position in the web running direction 3 can be set exactly.
  • the second contact pressure element (13.2), viewed in the web running direction 3 is pressed more strongly than the first pressure element (13.1).
  • the exact adjustment of the compression pressure profiles in the transverse direction 4 and in the web running direction 3 is particularly at high heat flux densities, as they are possible by using a drying cylinder 7 made of steel advantage.
  • the steam-heated drying cylinder 7 comprises an end cap on the front side.
  • the front cover 9 are executed on its outside with a thermal insulation. This reduces heat losses and improves the energy balance.
  • the drying cylinder 7 has a diameter of 4.8 m and the interior can be acted upon with steam at a pressure of 0.7 MPa (7 bar).
  • the cylindrical part 8 has an outer coating to assist the creping process.
  • the press nip 10 has a length of 55 mm in the web running direction 3. As a result, a higher maximum pressing pressure in the press nip 10 can be achieved for a given maximum line force.
  • the press shoe 6 is pressed against the drying cylinder 7 to form the press nip 10.
  • the press shoe 6 is made of metal, in particular bronze or aluminum and has a ground surface.
  • the shoe press unit 5 is assigned a safety device for opening the press nip 10, comprising a control or regulating unit. or control unit, in the absence of the fibrous web 2 on the water-absorbing carrier tape 11, causes the pressing elements (13.1, 13.2) of the press shoe to be deactivated and / or the shoe press unit 5 to be swiveled. Damage to or impairment of the water-absorbing carrier tape 11 or the water-impermeable press belt 12 can thus be avoided.
  • the FIG. 2 shows a part of the FIG. 1 with a shoe press unit 5 and a drying cylinder 7 in a simplified representation.
  • the shoe press unit 5 comprises a press shoe 6 and pressing elements (13.1, 13.2) which are supported on a machine-width yoke mounted in the edge regions of the machine 1. These elements are surrounded by a circumferential, water-impermeable press belt 12. The interior of the water-impermeable press belt 12 is sealed from the environment.
  • the two pressing elements (13.1, 13.2) each extend in the transverse direction 4 and are arranged next to one another in the web running direction 3. They press the press shoe 6 to form a press nip 10 against the drying cylinder 7.
  • the pressing elements (13.1, 13.2) are designed as pressure hoses.
  • the pressure hoses are independently pressurized.
  • the profile of the pressing pressure in the web running direction 3 can be adapted to the given production conditions.
  • the maximum pressing pressure itself and also its position in the web running direction 3 can be set accurately.
  • the second contact pressure element (13.2) viewed in the web running direction 3, is pressed more strongly than the first pressure element (13.1).
  • FIG. 3 shows a press shoe 6 in a simplified representation of the machine 1 according to Figure l and a pressure profile in the press nip 10 in the web running direction 3.
  • the press shoe 6 has in the region of the press nip 10, an average press shoe thickness 15, which is smaller than 20 mm.
  • This has the advantage that the pressing pressure profile in the transverse direction 4, in particular in the edge regions of the press nip 10, runs uniformly and constantly.
  • the effects of geometric variations of the drying cylinder 7, for example in the edge regions due to the vapor pressure and the different thermal conditions between the drying cylinder center and the two edge zones can be compensated.
  • the flexible flexible press shoe 10 can conform to the contour of the drying cylinder during operation of the machine, so that the compression pressure profile in the transverse direction 4 is constant.
  • the press shoe 6 Since the press shoe 6 is adapted to the diameter of the drying cylinder 7, the press shoe thickness (15.1, 15.2) in the web running direction 3 is not completely constant. Approximately in the middle of the press nip 10, the press shoe thickness is thereby slightly thinner than at the beginning and at the end of the press nip 10.
  • the average press shoe thickness is therefore the mean of the values of the press shoe thickness (15.1, 15.2) at the beginning, in the middle and at the end of the press nip 10.
  • the press shoe has an average press shoe thickness (15), which is 10 mm, of the press nip 10.
  • the press shoe 10 thus has a minimum thickness, which on the one hand enables a uniform pressure profile in the web running direction 3 over the entire press nip.
  • This resulting minimum bending stiffness ensures a constant position of the press nip end in Web running direction 3 and this over the entire width of the press nip in the transverse direction 4.
  • the sharp boundary of the press nip can be a very strong and also across the width constant pressure drop of the pressing pressure at the end of the press nip 10 reach.
  • a rewetting of the fibrous web 2 by the water-absorbing carrier tape 11 at the end of the press nip 10 can be avoided or at least greatly reduced.
  • the drainage efficiency is thereby significantly increased. Moisture streaks in the fibrous web due to uneven remoistening can be avoided by the high and constant width pressure drop.
  • a pressure profile in the web running direction 3 is shown schematically.
  • the pressing pressure begins at the beginning of the press shoe 6 with a gentle rise and reached shortly before the end of the press shoe 6, the maximum pressing pressure, which drops very steeply to the end.
  • values in the pressure drop of more than 1000 kPa / mm are constantly achieved across the width in the transverse direction of the press nip 10. This minimizes or prevents rewetting of the fibrous web 2 by the water-absorbing carrier tape 11.
  • the resulting in the press nip pressure profile in the web running direction has in this example at a line force of 120 kN / m, a maximum pressure of 4.5 MPa.

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Description

Die Erfindung betrifft eine Maschine zur Herstellung einer Faserstoffbahn, insbesondere einer Tissue- oder Hygienepapierbahn oder einer einseitig glatten Faserstoffbahnbahn, mit wenigstens einem zwischen einer einen Pressschuh umfassenden Schuhpresseinheit und einem Trockenzylinder gebildeten Pressspalt, durch den ein wasseraufnehmendes Trägerband, ein wasserundurchlässiges Pressband und die Faserstoffbahn hindurchgeführt sind, wobei der Trockenzylinder einen zylindrischen Teil und stirnseitig jeweils einen Stirndeckel umfasst. Die Erfindung betrifft auch ein Verfahren zur Herstellung einer Faserstoffbahn, insbesondere einer Tissue- oder Hygienepapierbahn oder einer einseitig glatten Faserstoffbahn.The invention relates to a machine for producing a fibrous web, in particular a tissue or tissue paper web or a single-sided smooth fibrous web, comprising at least one press nip formed between a press shoe comprising a press shoe and a drying cylinder, through which a water-absorbent carrier tape, a water-impermeable press belt and the fibrous web passed are, wherein the drying cylinder comprises a cylindrical part and the end face in each case a front cover. The invention also relates to a method for producing a fibrous web, in particular a tissue or tissue paper web or a single-sided smooth fibrous web.

Maschinen dieser Art sind bekannt. So beschreibt das Dokument DE 19860687 A1 beispielsweise eine Maschine mit einem zwischen einer Schuhpresseinheit und einem Trockenzylinder gebildeten Pressspalt zur Entwässerung von Tissuebahnen. Es wird vorgeschlagen, einen kurzen Pressschuh einzusetzen, um einen höheren maximalen Pressdruck im Pressnip bei einer für Yankeezylinder maximal zulässigen Linienlast von 90kN/m erreichen zu können. Dadurch wird ein höherer Trockengehalt nach der Schuhpresseinheit erreicht.Machines of this type are known. This is how the document describes DE 19860687 A1 For example, a machine with a press nip formed between a shoe press unit and a drying cylinder for dewatering tissue webs. It is proposed to use a short press shoe in order to achieve a higher maximum pressure in the press nip at a maximum allowable Yankee cylinder line load of 90kN / m. This achieves a higher dry content after the shoe press unit.

Das Dokument US2010/0000696 A1 beschreibt ein strukturiertes Band das zur Herstellung einer strukturierten Faserstoffbahn in einer Maschine vorgesehen ist. Die -Maschine umfasst einen zwischen einer Schuhpresswalze mit einem Pressschuh und einem Yankee-Trockenzylinder gebildeten Schuhpressnip. Die Faserstoffbahn wird auf dem strukturierten Band liegend durch den Schuhpressnip geführt, strukturiert und zur Trocknung an die zylindrische Oberfläche des Yankee-Trockenzylinders übergeben.The document US2010 / 0000696 A1 describes a structured tape intended for producing a structured fibrous web in a machine. The machine comprises a shoe press nip formed between a shoe press roll having a press shoe and a Yankee drying cylinder. The fibrous web is guided on the structured band through the shoe press nip, structured and transferred to the cylindrical surface of the Yankee drying cylinder for drying.

Aufgabe der Erfindung ist es Maschinen dieser Art und Verfahren zur Herstellung solcher Faserstoffbahnen hinsichtlich Trocknungseffizienz und Wirtschaftlichkeit zu verbessern.The object of the invention is to improve machines of this type and methods for producing such fibrous webs in terms of drying efficiency and cost-effectiveness.

Die Aufgabe wird durch eine Maschine gemäß Anspruch 1 zur Herstellung einer Faserstoffbahn, insbesondere einer Tissue- oder Hygienepapierbahn oder einer einseitig glatten Faserstoffbahnbahn gelöst, mit wenigstens einem zwischen einer einen Pressschuh umfassenden Schuhpresseinheit und einem dampfbeheizten Trockenzylinder gebildeten Pressspalt, durch den ein wasseraufnehmendes Trägerband, ein wasserundurchlässiges Pressband und die Faserstoffbahn hindurchgeführt sind, wobei der Trockenzylinder einen zylindrischen Teil und stirnseitig jeweils einen Stirndeckel umfasst, wobei unmittelbar nach dem Pressspalt die Faserstoffbahn an die heiße Oberfläche des zylindrischen Teils des dampfbeheizten Trockenzylinders übergeben und getrocknet wird und wobei der zylindrischen Teil des Trockenzylinders zumindest teilweise aus Stahl besteht. Erfindungsgemäß wird vorgeschlagen, dass dass das wasseraufnehmende Trägerband als Filzband ausgeführt ist und dass der zylindrische Teil des Trockenzylinders eine Beschichtung aufweist.The object is achieved by a machine according to claim 1 for producing a fibrous web, in particular a tissue or hygienic paper web or a unilaterally smooth fibrous web, with at least one press nip formed between a shoe press unit comprising a press shoe and a steam-heated drying cylinder, through which a water-absorbing carrier tape water-impermeable press belt and the fibrous web are passed, wherein the drying cylinder comprises a cylindrical part and the end face each having a front cover, immediately after the press nip the fibrous web is transferred to the hot surface of the cylindrical part of the steam-heated drying cylinder and dried and wherein the cylindrical part of the drying cylinder at least partially made of steel consists. According to the invention it is proposed that the water-absorbing carrier tape is designed as a felt belt and that the cylindrical part of the drying cylinder has a coating.

Durch den Einsatz eines dampfbeheizten Trockenzylinders aus Stahl kann in Verbindung mit einer Schuhpresseinheit der Wärmestrom an die Faserstoffbahn zur effizienteren Entwässerung im Vergleich zu einem Trockenzylinder aus Gußeisen, gesteigert werden.By using a steam-heated steel drying cylinder, in combination with a shoe press unit, the heat flow to the fibrous web can be increased for more efficient dewatering compared to a cast iron drying cylinder.

Der Trockenzylinder ist im Betrieb mechanischen und thermischen Belastungen ausgesetzt. Die mechanischen Belastungen setzen sich im Wesentlichen zum einen aus dem Dampfdruck im Innern des Trockenzylinders und zum andern durch die Anpressung der Schuhpresseinheit zusammen. Thermische Belastungen entstehen durch die Aufheizung und die unterschiedlichen thermischen Bedingungen zwischen der Trockenzylindermitte und den beiden Randzonen. Der Einsatz von Stahl anstelle von Gußeisen erfordert geringere Sicherheitszuschläge bei der festigkeitsgerechten Dimensionierung. Die daraus resultierende höhere mechanische Belastbarkeit des Trockenzylinders aus Stahl ermöglicht höhere Linienkräfte durch die Schuhpresseinheit. Zusätzlich kann die Wandstärke bei gleicher mechanischer Belastung durch den Innendruck des dampfbeheizten Trockenzylinders dünner ausgeführt werden als bei Zylinder aus Gußeisen. Dies führt zu einem geringeren Wärmeleitwiderstand und zu einem höheren Wärmestrom. Auf der anderen Seite kann der Dampfdruck im Innern des Trockenzylinders erhöht werden. Dadurch lassen sich höhere Temperaturen erreichen. Dies führt ebenfalls zu einem höheren Wärmstrom und zu einer gesteigerten Entwässerung der Faserstoffbahn. Aufgrund der Erfindung können somit höhere Trockengehalte nach dem Pressspalt erreicht und die Papierproduktion durch Erhöhung der Maschinengeschwindigkeit gesteigert werden.The drying cylinder is exposed during operation mechanical and thermal loads. The mechanical loads are essentially composed of the vapor pressure inside the drying cylinder and the pressure of the shoe press unit. Thermal stress results from the heating and the different thermal conditions between the center of the drying cylinder and the two edge zones. The use of steel instead of cast iron requires lower safety margins in the strength-appropriate dimensioning. The resulting higher mechanical load capacity of the steel drying cylinder allows higher line forces through the shoe press unit. In addition, the wall thickness at the same mechanical load by the internal pressure of the steam-heated drying cylinder can be made thinner than cast iron cylinder. This leads to a lower heat conduction resistance and to a higher heat flow. On the other hand, the vapor pressure inside the drying cylinder can be increased. This allows higher temperatures to be achieved. This also leads to a higher heat flow and increased dewatering of the fibrous web. Due to the invention thus higher dry contents can be achieved after the press nip and the paper production can be increased by increasing the machine speed.

Die Maschine ist besonders geeignet, leichte Papiere, wie beispielsweise Tissue-Papiere oder einseitig glatte Papiere herzustellen. Das Flächengewicht liegt im Bereich von kleiner 45 g/m2, insbesondere von kleiner als 30g/m2, vorzugsweise von kleiner als 25g/m2. Beispielsweise liegt ein bevorzugter Flächengewichtsbereich zwischen 11 g/m2 und 45 g/m2. Für beide Papiersorten ist zweckmäßigerweise nur ein Trockenzylinder vorgesehen. Bei Tissuepapieren weist der Trockenzylinder einen Kreppschaber zur Kreppung der Faserstoffbahn auf. Durch die Stauchung wird ein höheres spezifisches Volumen und eine höhere Weichheit erreicht. Bei der Herstellung von einseitig glatten Papieren ist kein Kreppschaber vorgesehen, allerdings ein Reinigungsschaber zur Sauberhaltung der Trockenzylinderoberfläche des zylindrischen Teiles. Diese ist sehr glatt ausgeführt und weist eine Beschichtung auf, beispielsweise eine Beschichtung aus Chrom. Die Glätte der der Trockenzylinderoberfläche zugewandten Seite der Faserstoffbahn wird dadurch erhöht.The machine is particularly suitable for making light weight papers such as tissue papers or plain papers. The basis weight is in the range of less than 45 g / m 2 , in particular less than 30 g / m 2 , preferably less than 25 g / m 2 . For example, a preferred basis weight range is between 11 g / m 2 and 45 g / m 2 . For both types of paper only one drying cylinder is expediently provided. For tissue papers, the drying cylinder has a creping doctor for creping the fibrous web. The compression results in a higher specific volume and a higher softness. In the production of one-sided smooth papers no creping doctor is provided, however a cleaning scraper for keeping clean the drying cylinder surface of the cylindrical part. This is very smooth and has a coating, such as a coating of chrome. The smoothness of the drying cylinder surface facing side of the fibrous web is thereby increased.

Der Trockenzylinder kann auch für die Herstellung von Tissue-Papieren eine Außenbeschichtung des zylindrischen Teiles aus metallischem oder keramischem Material umfassen.The drying cylinder may also comprise an outer coating of the cylindrical part of metallic or ceramic material for the production of tissue paper.

Das wasseraufnehmende Trägerband ist als Filzband ausgeführt.The water-absorbing carrier tape is designed as a felt belt.

In einer vorteilhaften Ausgestaltung der Erfindung ist vorgesehen, dass der gebildete Pressspalt in Bahnlaufrichtung eine Länge von weniger als 125 mm, insbesondere von weniger als 80 mm, vorzugsweise von weniger als 70 mm, insbesondere von weniger als 60 mm, besitzt. Dadurch kann ein höherer maximaler Pressdruck im Pressspalt bei gegebener maximaler Linienkraft erreicht werden. Des Weiteren besitzt die Druckverlaufskurve über der Pressspaltlänge in Bahnlaufrichtung, durch die Vorgabe einer maximalen Länge des Pressspaltes, einen steilen Anstieg und einen steilen Abfall, wodurch die Faserstoffbahn nur kurzzeitig mit dem hohen maximalen Pressdruck beaufschlagt wird. Die Faserstoffbahn wird dadurch nicht kompaktiert. Das spezifische Volumen bleibt dadurch nahezu erhalten.In an advantageous embodiment of the invention, it is provided that the press nip formed in the web running direction has a length of less than 125 mm, in particular less than 80 mm, preferably less than 70 mm, in particular less than 60 mm. As a result, a higher maximum pressing pressure in the press nip can be achieved for a given maximum line force. Furthermore, the pressure curve has over the press nip length in the web running direction, by specifying a maximum length of the press nip, a steep rise and a steep drop, whereby the fibrous web is only briefly applied to the high maximum pressing pressure. The fibrous web is not compacted thereby. The specific volume thus remains almost intact.

Der Pressschuh wird zur Bildung des Pressspaltes gegen den Trockenzylinder gepresst. Dabei ist es vorteilhaft, wenn der Pressschuh aus Metall, insbesondere aus Bronze oder Aluminium besteht. Dadurch wird ein gleichmäßiges Pressdruckprofil in Querrichtung zur Maschine als auch in Bahnlaufrichtung erreicht. Dies wiederum hat verbesserte Feuchtequerprofile und Feuchtelängsprofile in der Faserstoffbahn zur Folge und verbessert somit die Qualität der hergestellten Faserstoffbahn.The press shoe is pressed against the drying cylinder to form the press nip. It is advantageous if the press shoe made of metal, in particular bronze or aluminum. This achieves a uniform pressure profile in the transverse direction of the machine as well as in the web running direction. This in turn results in improved transverse moisture profiles and longitudinal moisture profiles in the fibrous web and thus improves the quality of the fibrous web produced.

In einer praktischen Ausführung umfasst die Schuhpresseinheit mindestens zwei, sich jeweils in Querrichtung erstreckende und in Bahnlaufrichtung nebeneinander angeordnete, Anpresselemente zur Anpressung des Pressschuhes gegen den Trockenzylinder. Die Anpresselemente können jeweils beispielsweise als Druckschläuche ausgebildet sein. Die Druckschläuche sind vorzugsweise unabhängig voneinander mit Druck beaufschlagbar. Somit lässt sich das Profil des Pressdruckes in Bahnlaufrichtung den gegebenen Produktionsbedingungen anpassen. Beispielsweise kann der maximale Pressdruck selbst und auch dessen Lage in Bahnlaufrichtung genau eingestellt werden. So wird beispielsweise für eine hohe Entwässerungsleistung das in Bahnlaufrichtung betrachtet zweite Anpresselement stärker angepresst als das erste Anpresselement. Die genaue Einstellung der Pressdruckprofile in Querrichtung und in Bahnlaufrichtung ist besonders bei hohen Wärmestromdichten, wie sie durch Einsatz eines Trockenzylinders aus Stahl möglich sind, von Vorteil.In a practical embodiment, the shoe press unit comprises at least two, each extending in the transverse direction and in the web running direction side by side, pressing elements for pressing the press shoe against the drying cylinder. The pressing elements can each be designed, for example, as pressure hoses. The pressure hoses are preferably independently pressurizable. Thus, the profile of the pressing pressure in the web running direction can be adapted to the given production conditions. For example, the maximum pressing pressure itself and also its position in the web running direction can be set exactly. Thus, for example, for a high dewatering performance, the second contact pressure element considered in the web running direction is pressed more strongly than the first contact pressure element. The exact adjustment of the compression pressure profiles in the transverse direction and in the web running direction is particularly at high heat flux densities, as they are possible by using a drying cylinder made of steel, an advantage.

Zweckmäßigerweise erstrecken sich die Anpresselemente im Wesentlichen über den gesamten Pressspalt in Querrichtung, zumindest jedoch im Bereich der Faserstoffbahnbreite. Zusätzliche Anpresselemente in den Randbereichen des Pressspaltes können vermieden werden.Advantageously, the pressing elements extend substantially over the entire press nip in the transverse direction, but at least in the region of the fibrous web width. Additional pressing elements in the edge regions of the press nip can be avoided.

Gemäß einer weiteren bevorzugten Ausführungsform weist der Pressschuh zumindest im Bereich des Pressspaltes eine mittlere Pressschuhdicke auf, welche gleich oder kleiner als 20 mm, insbesondere gleich oder kleiner als 18 mm, vorzugsweise gleich oder kleiner als 16 mm, ist. Dies hat den Vorteil, dass das Pressdruckprofil in Querrichtung, insbesondere in den Randbereichen des Pressspaltes, gleichmäßig und konstant verläuft. Die Auswirkungen geometrischer Abweichungen des Trockenzylinders, beispielsweise in den Randbereichen infolge des Dampfdruckes und den unterschiedlichen thermischen Bedingungen zwischen der Trockenzylindermitte und den beiden Randzonen können so ausgeglichen werden. Der biegeweich ausgeführte Pressschuh kann sich an die Kontur des Trockenzylinders im Betrieb der Maschine anschmiegen. Da der Pressschuh an den Durchmesser des Trockenzylinders angepasst ist, ist die Pressschuhdicke in Bahnlaufrichtung nicht ganz konstant. Etwa in der Mitte des Pressspaltes ist die Pressschuhdicke dadurch geringfügig dünner als am Beginn und am Ende des Pressspaltes. Die mittlere Pressschuhdicke ist daher der Mittelwert der Werte der Pressschuhdicke am Anfang, in der Mitte und am Ende des Pressspaltes.According to a further preferred embodiment, the press shoe, at least in the region of the press nip, has an average press shoe thickness which is equal to or less than 20 mm, in particular equal to or less than 18 mm, preferably equal to or less than 16 mm. This has the advantage that the pressing pressure profile in the transverse direction, in particular in the edge regions of the press nip, runs uniformly and constantly. The effects of geometric variations of the drying cylinder, for example in the edge regions due to the vapor pressure and the different thermal conditions between the drying cylinder center and the two edge zones can be compensated. The flexible soft press shoe can conform to the contour of the drying cylinder during operation of the machine. Since the press shoe is adapted to the diameter of the drying cylinder, the press shoe thickness in the web running direction is not quite constant. Approximately in the middle of the press nip the press shoe thickness is thereby slightly thinner than at the beginning and at the end of the press nip. The median press shoe thickness is therefore the average of the values of the press shoe thickness at the beginning, in the middle and at the end of the press nip.

Vorteilhafterweise weist der Pressschuh zumindest im Bereich des Pressspaltes eine mittlere Pressschuhdicke auf, welche gleich oder größer als 10 mm, insbesondere gleich oder größer als 12 mm, vorzugsweise gleich oder größer als 14 mm, ist. Der Pressschuh weist also eine Mindestdicke auf, welche zum einen ein gleichmäßiges Pressdruckprofil in Bahnlaufrichtung über den gesamten Pressspalt ermöglicht. Diese daraus resultierende Mindestbiegesteifigkeit gewährleistet eine konstante Lage des Pressspaltendes in Bahnlaufrichtung und dies über die gesamte Breite des Pressspaltes in Querrichtung. Durch die scharfe Begrenzung des Pressspaltendes lässt sich ein sehr starker und auch über die Breite konstanter Druckabfall des Pressdruckes am Ende des Pressspaltes erreichen. Eine Rückbefeuchtung der Faserstoffbahn durch das wasseraufnehmende Trägerband am Ende des Pressspaltes kann vermieden oder zumindest stark reduziert werden. Die Entwässerungseffizienz wird dadurch erheblich gesteigert. Feuchtestreifen in der Faserstoffbahn durch ungleichmäßige Rückbefeuchtung können durch den hohen und über die Breite konstanten Druckabfall vermieden werden.Advantageously, the press shoe, at least in the region of the press nip, has an average press shoe thickness which is equal to or greater than 10 mm, in particular equal to or greater than 12 mm, preferably equal to or greater than 14 mm. The press shoe thus has a minimum thickness, which on the one hand enables a uniform pressure profile in the web running direction over the entire press nip. This resulting minimum bending stiffness ensures a constant position of the press nip end in the web running direction over the entire width of the press nip in the transverse direction. Due to the sharp limitation of the press-nip end, a very strong and even over the width constant pressure drop of the pressing pressure at the end of the press nip can be achieved. A rewetting of the fibrous web by the water-absorbing carrier tape at the end of the press nip can be avoided or at least greatly reduced. The Drainage efficiency is thereby increased considerably. Moisture streaks in the fibrous web due to uneven remoistening can be avoided by the high and constant width pressure drop.

In einer weiteren praktischen Ausgestaltung sind die stirnseitig des zylindrischen Teils des Trockenzylinders angeordneten Stirndeckel aus Stahl und sind mit dem zylindrischen Teil des Trockenzylinders verschraubt oder verschweißt oder die Stirndeckel sind aus Gußeisen und mit dem zylindrischen Teil des Trockenzylinders verschraubt.In a further practical embodiment, the front side of the cylindrical part of the drying cylinder arranged end cover made of steel and are bolted or welded to the cylindrical part of the drying cylinder or the end covers are made of cast iron and bolted to the cylindrical part of the drying cylinder.

In einer bevorzugten Ausführung ist dem Trockenzylinder eine Trocknungshaube zur Beaufschlagung der Faserstoffbahn mit Dampf und/oder heißer Luft zugeordnet.In a preferred embodiment, the drying cylinder is associated with a drying hood for impinging the fibrous web with steam and / or hot air.

Der Trockenzylinder weist zweckmäßigerweise einen Durchmesser von mehr als 3 m, insbesondere von mehr als 4 m auf und der Innenraum ist mit Dampf mit einem Druck von gleich oder größer als 0,5 MPa (5bar), insbesondere von gleich oder größer als 0,6 MPa (6 bar), vorzugsweise von gleich oder größer als 0,7 MPa (7 bar) beaufschlagbar.The drying cylinder expediently has a diameter of more than 3 m, in particular more than 4 m, and the interior is filled with steam at a pressure equal to or greater than 0.5 MPa (5 bar), in particular equal to or greater than 0.6 MPa (6 bar), preferably of equal to or greater than 0.7 MPa (7 bar) acted upon.

Der Trockenzylinder ist während des Betriebs der Maschine vorteilhafterweise so mit Dampf beaufschlagbar, dass die Oberflächentemperatur des zylindrischen Teils an der Außenseite nach dem Kreppschaber oder nach Abziehen der Faserstoffbahn mehr als 100 °C, insbesondere mehr als 120 °C beträgt. Dieses Temperaturniveau reduziert die Viskosität des in der Faserstoffbahn enthaltenen Wassers im Pressspalt auf optimale Werte. Dies führt in Verbindung mit dem geringeren Wärmeleitwiderstand des zylindrischen Teils des Trockenzylinders aus Stahl, sowie mit der größeren Verweilzeit der Faserstoffbahn in dem durch die Geometrie des Pressschuhes festgelegten Pressspalt zu einer verbesserten und effizienten Entwässerung der Faserstoffbahn. Es kann somit ein höherer Trockengehalt der Faserstoffbahn, bei gleicher Maschinengeschwindigkeit, nach dem Pressspalt erreicht werden, als dies bei bekannten Maschinen, mit beispielsweise einer Saugpresswalze anstelle der Schuhpresseinheit und einem Trockenzylinder aus Gußeisen, der Fall ist. Es ist dadurch auch möglich, den Trockengehalt konstant zu halten und die Maschinengeschwindigkeit und damit die Produktion zu erhöhen.During operation of the machine, the drying cylinder can advantageously be so charged with steam that the surface temperature of the cylindrical part on the outside after the creping doctor or after removal of the fibrous web is more than 100.degree. C., in particular more than 120.degree. This temperature level reduces the viscosity of the water contained in the fibrous web in the press nip to optimum values. This, in conjunction with the lower thermal resistance of the cylindrical portion of the drying cylinder made of steel, as well as with the greater residence time of the fibrous web in the fixed by the geometry of the press shoe press nip to improved and efficient dewatering of the fibrous web. It can thus be achieved a higher dry content of the fibrous web, at the same machine speed, after the press nip, as is the case with known machines, for example with a suction press roll instead of the shoe press unit and a drying cylinder made of cast iron. It is thus also possible to keep the dry content constant and to increase the machine speed and thus the production.

Gemäß einer vorteilhaften Weiterentwicklung weisen die Stirndeckel eine thermische Isolierung auf der Außenseite und/oder auf der Innenseite auf. Diese reduziert Wärmeverluste und verbessert die Energiebilanz.According to an advantageous development, the end covers have a thermal insulation on the outside and / or on the inside. This reduces heat losses and improves the energy balance.

In einer weiteren möglichen Ausgestaltung ist der Schuhpresseinheit eine Steuer- oder Regeleinheit umfassende Sicherheitsvorrichtung zum Öffnen des Pressspaltes zugeordnet, wobei die Steuer- oder Regeleinheit, beim Fehlen der Faserstoffbahn auf dem wasseraufnehmende Trägerband, veranlasst, die Anpresselemente zu deaktivieren und/oder die Schuhpresseinheit abzuschwenken. Eine Beschädigung oder Beeinträchtigung des wasseraufnehmenden Trägerbandes oder des wasserundurchlässiges Pressbandes können vermieden werden.In a further possible embodiment, the shoe press unit is assigned a safety device for controlling the control of the press nip, the control unit, in the absence of the fibrous web on the water-absorbent carrier tape, causing the press elements to be deactivated and / or the shoe press unit to be swung off. Damage to or impairment of the water-absorbing carrier tape or the water-impermeable press belt can be avoided.

Ferner ist es möglich, dass der Pressschuh mit einer Linienkraft von gleich oder mehr als 90 kN/m, insbesondere von gleich oder mehr als 110 kN/m, vorzugsweise von gleich oder mehr als 120 kN/m gegen den Trockenzylinder anpressbar ist.Further, it is possible that the press shoe with a line force of equal to or more than 90 kN / m, in particular equal to or more than 110 kN / m, preferably equal to or more than 120 kN / m can be pressed against the drying cylinder.

Der Trockenzylinder ist in einer bevorzugten Ausführung so gestaltet und dimensioniert, dass er mit einer Linienkraft zwischen 60 kN/m und 140 kN/m, vorzugsweise zwischen 60 kN/m und 120 kN/m beaufschlagbar ist.The drying cylinder is designed and dimensioned in a preferred embodiment so that it can be acted upon by a line force between 60 kN / m and 140 kN / m, preferably between 60 kN / m and 120 kN / m.

Der Trockenzylinder weist vorteilhafterweise auf der Innenseite des zylindrischen Teils Rillen zur Erhöhung der mechanischen Stabilität und zur Erhöhung des Wärmestroms auf.The drying cylinder advantageously has grooves on the inside of the cylindrical part for increasing the mechanical stability and increasing the heat flow.

Die Wandstärke des zylindrischen Teils des Trockenzylinders ist, ohne Berücksichtigung von optionalen Rillen, zweckmäßigerweise kleiner als 55 mm, vorzugsweise kleiner oder gleich 45 mm.The wall thickness of the cylindrical part of the drying cylinder is, without consideration of optional grooves, expediently less than 55 mm, preferably less than or equal to 45 mm.

Es ist in einer Ausgestaltung der Erfindung möglich und vorteilhaft, wenn das sich im Pressspalt ergebende Druckprofil in Bahnlaufrichtung bei einer Linienkraft von kleiner oder gleich 140 kN/m; insbesondere von kleiner oder gleich 120 kN/m einen Maximaldruck von mehr als 2 MPa, insbesondere mehr als 3 MPa und vorzugsweise mehr als 4 MPa aufweist.It is possible and advantageous in one embodiment of the invention if the pressure profile resulting in the press nip in the web running direction at a line force of less than or equal to 140 kN / m; in particular of less than or equal to 120 kN / m has a maximum pressure of more than 2 MPa, in particular more than 3 MPa and preferably more than 4 MPa.

Besonders vorteilhaft ist es, wenn das sich im Pressspalt ergebende Druckprofil in Bahnlaufrichtung am Ende des Pressspaltes einen Druckabfall von mehr als 800 kPa/mm, insbesondere von mehr als 1000 kPa/mm, vorzugsweise mehr als 1100 kPa/mm, aufweist. Dies minimiert oder verhindert eine Rückbefeuchtung der Faserstoffbahn durch das wasseraufnehmende Trägerband.It is particularly advantageous if the pressure profile resulting in the press nip in the web running direction at the end of the press nip has a pressure drop of more than 800 kPa / mm, in particular more than 1000 kPa / mm, preferably more than 1100 kPa / mm. This minimizes or prevents rewetting of the fibrous web by the water-absorbing carrier tape.

In einer praktischen, möglichen Ausgestaltung der Erfindung umfasst die Maschine einen Stoffauflauf, ein umlaufendes Außensieb, ein umlaufendes wasseraufnehmendes Trägerband, wobei der Stoffauflauf eine Faserstoffsuspension zwischen das umlaufende Außensieb und das umlaufende wasseraufnehmende Trägerband in Form eines Strahles abgibt, und das Außensieb und das wasseraufnehmende Trägerband eine Formierwalze teilweise umschlingen und wobei im Umschlingungsbereich die Faserstoffsuspension entwässert wird und die gebildete Faserstoffbahn auf dem wasseraufnehmenden Trägerband liegend zur weiteren Entwässerung über eine besaugte Walze und durch den Pressspalt geführt ist. Dies ermöglicht eine besonders einfache und effiziente Herstellung der Faserstoffbahn.In a practical, possible embodiment of the invention, the machine comprises a headbox, a peripheral outer sieve, a circulating water-absorbing carrier tape, wherein the headbox emits a pulp suspension between the rotating outer sieve and the circulating water-absorbing carrier tape in the form of a jet, and the outer sieve and the water-absorbing carrier tape partially wrap around a forming roller and wherein the fiber suspension is dewatered in the looping area and the formed fibrous web is guided on the water-accepting carrier belt for further dewatering over an evacuated roller and through the press nip. This allows a particularly simple and efficient production of the fibrous web.

Die Aufgabe wird auch durch ein Verfahren gemäß Anspruch 17 zur Herstellung einer Faserstoffbahn, insbesondere einer Tissue- oder Hygienepapierbahn oder einer einseitig glatten Faserstoffbahn, gelöst. Die Faserstoffbahn und ein wasseraufnehmendes Trägerband, und ein wasserundurchlässiges Pressband werden durch wenigstens einen zwischen einer einen Pressschuh umfassenden Schuhpresseinheit und einem Trockenzylinder gebildeten Pressspalt hindurchgeführt, wobei der Trockenzylinder einen zylindrischen Teil und stirnseitig jeweils einen Stirndeckel umfasst. Erfindungsgemäß ist vorgesehen, dass der zylindrische Teil des Trockenzylinders zumindest teilweise aus Stahl ausgebildet wird.The object is also achieved by a method according to claim 17 for producing a fibrous web, in particular a tissue or tissue paper web or a single-sided smooth fibrous web. The fibrous web and a water-absorbing carrier tape, and a water-impermeable press belt are passed through at least one press nip formed between a shoe press unit comprising a press shoe and a drying cylinder, wherein the drying cylinder comprises a cylindrical part and an end cap on the front side. According to the invention, it is provided that the cylindrical part of the drying cylinder is at least partially made of steel.

Weitere Merkmale und Vorteile der Erfindung ergeben sich aus der nachfolgenden Beschreibung bevorzugter Ausführungsbeispiele unter Bezugnahme auf die Zeichnung.Further features and advantages of the invention will become apparent from the following description of preferred embodiments with reference to the drawings.

Es zeigen

Figur 1
eine erfindungsgemäße Maschine zur Herstellung einer Tissue- oder Hygienepapierbahn ;
Figur 2
einen Ausschnitt der Figur 1 mit einer Schuhpresseinheit und einem Trockenzylinder in vereinfachter Darstellung;
Figur 3
einen Pressschuh in vereinfachter Darstellung und einem Pressdruckverlauf im Pressspalt in Bahnlaufrichtung;
Show it
FIG. 1
a machine according to the invention for producing a tissue or tissue paper web;
FIG. 2
a section of the FIG. 1 with a shoe press unit and a drying cylinder in a simplified representation;
FIG. 3
a press shoe in a simplified representation and a pressure profile in the press nip in the web running direction;

In Figur 1 ist eine erfindungsgemäße Maschine 1 am Beispiel eines bekannten Crescent-Formers dargestellt. Die sonst übliche Sauganpresswalze ist durch eine Schuhpresseinheit 5 ersetzt. Dem Trockenzylinder 7 ist ein Kreppschaber wie er üblicherweise zur Herstellung von gekreppten Tissue-Papieren verwendet wird, zugeordnet.In FIG. 1 a machine 1 according to the invention is shown using the example of a known crescent former. The usual Sauganpresswalze is replaced by a shoe press unit 5. The drying cylinder 7 is associated with a creping doctor as it is commonly used for the production of creped tissue papers.

Diese Maschine 1 eignet sich auch zur Herstellung von einseitig glatten Papieren mit kleinen Modifikationen. Bei der Herstellung von einseitig glatten Papieren ist beispielsweise kein Kreppschaber vorgesehen. Er wird durch einen Reinigungsschaber zur Sauberhaltung der Trockenzylinderoberfläche des zylindrischen Teiles 8 ersetzt. Diese ist sehr glatt ausgeführt und weist vorzugsweise eine Beschichtung auf, beispielsweise eine Beschichtung aus Chrom. In diesem Fall wird die produzierte Faserstoffbahn 2 im freien Zug von der Trockenzylinderoberfläche 8 abgezogen.This machine 1 is also suitable for the production of one-sided smooth papers with small modifications. In the production of one-sided smooth papers, for example, no creping doctor is provided. It is replaced by a cleaning scraper to keep clean the drying cylinder surface of the cylindrical part 8. This is very smooth and preferably has a coating, such as a coating of chromium. In this case, the fibrous web 2 produced is drawn off the drying cylinder surface 8 in free tension.

Die erfindungsgemäße Maschine 1 umfasst einen Stoffauflauf, der eine Faserstoffsuspension zwischen ein umlaufendes Außensieb und ein umlaufendes wasseraufnehmendes Trägerband 11 in Form eines Strahles abgibt. Das wasseraufnehmende Trägerband 11 ist als Filz ausgeführt. Das Außensieb und der Filz 11 umschlingen teilweise eine Formierwalze. Im Umschlingungsbereich wird die Faserstoffsuspension entwässert und die gebildete Faserstoffbahn 2 auf dem Filz 11 liegend zur weiteren Entwässerung über eine besaugte Walze und durch den Pressspalt 10 geführt. Der Pressspalt 10 wird durch eine einen Pressschuh 6 umfassenden Schuhpresseinheit 5 und dem Trockenzylinder 10 gebildet. Unmittelbar nach dem Pressspalt 10 wird die Faserstoffbahn 2 an die heiße Oberfläche des zylindrischen Teils 8 des dampfbeheizten Trockenzylinders 7 übergeben und getrocknet. Der Trockenzylinder 7 ist teilweise von einer Trocknungshaube 14 zur Beaufschlagung der Faserstoffbahn 2 mit Dampf und/oder heißer Luft, umgeben. Danach wird die Faserstoffbahn 2 durch einen Kreppschaber gekreppt und von der Oberfläche des zylindrischen Teils 8 des dampfbeheizten Trockenzylinders 7 abgenommen und über einen Messrahmen zur Messung von Qualitätsparametern der Faserstoffbahn 2 der Aufrollung zugeführt. Die Schuhpresseinheit 5 umfasst zwei, sich jeweils in Querrichtung 4 erstreckende und in Bahnlaufrichtung 3 nebeneinander angeordnete, Anpresselemente (13.1, 13.2) zur Anpressung des Pressschuhes 6 gegen den Trockenzylinder 7. Die Anpresselemente (13.1, 13.2) sind als Druckschläuche ausgebildet. Die Druckschläuche sind unabhängig voneinander mit Druck beaufschlagbar. Somit lässt sich das Profil des Pressdruckes in Bahnlaufrichtung 3 den gegebenen Produktionsbedingungen anpassen. Beispielsweise kann der maximale Pressdruck selbst und auch dessen Lage in Bahnlaufrichtung 3 genau eingestellt werden. So wird beispielsweise für eine hohe Entwässerungsleistung das in Bahnlaufrichtung 3 betrachtet zweite Anpresselement (13.2) stärker angepresst als das erste Anpresselement (13.1). Die genaue Einstellung der Pressdruckprofile in Querrichtung 4 und in Bahnlaufrichtung 3ist besonders bei hohen Wärmestromdichten, wie sie durch Einsatz eines Trockenzylinders 7 aus Stahl möglich sind, von Vorteil. Der dampfbeheizte Trockenzylinder 7 umfasst stirnseitig jeweils einen Stirndeckel. In dieser beispielhaften Ausführung besteht der zylindrische Teil 8 des Trockenzylinders 7 als auch die beiden Stirndeckel 9 aus Stahl. Diese sind mit dem zylindrischen Teil 8 verschweißt. Dadurch wird ein höherer Wärmestrom ermöglicht. Die Stirndeckel 9 sind auf ihrer Außenseite mit einer thermischen Isolierung ausgeführt. Diese reduziert Wärmeverluste und verbessert die Energiebilanz. Der Trockenzylinder 7 weist einen Durchmesser von 4,8 m auf und der Innenraum ist mit Dampf mit einem Druck von 0,7 MPa (7 bar) beaufschlagbar. Der zylindrische Teil 8 weist eine Außenbeschichtung zur Unterstützung des Kreppprozesses auf. Der der Pressspalt 10 besitzt in Bahnlaufrichtung 3 eine Länge von 55 mm. Dadurch kann ein höherer maximaler Pressdruck im Pressspalt 10 bei gegebener maximaler Linienkraft erreicht werden. Der Pressschuh 6 wird zur Bildung des Pressspaltes 10 gegen den Trockenzylinder 7 gepresst. Der Pressschuh 6 besteht aus Metall, insbesondere aus Bronze oder Aluminium und weist eine geschliffene Oberfläche auf. Dadurch wird ein gleichmäßiges Pressdruckprofil in Querrichtung 4 zur Maschine 1 als auch in Bahnlaufrichtung 3 erreicht. Dies wiederum hat verbesserte Feuchtequerprofile und Feuchtelängsprofile in der Faserstoffbahn 2 zur Folge und verbessert somit die Qualität der hergestellten Faserstoffbahn 2. Zur Verbesserung der Betriebssicherheit ist der Schuhpresseinheit 5 eine eine Steuer- oder Regeleinheit umfassende Sicherheitsvorrichtung zum Öffnen des Pressspaltes 10 zugeordnet, wobei die Steuer- oder Regeleinheit, beim Fehlen der Faserstoffbahn 2 auf dem wasseraufnehmende Trägerband 11, veranlasst, die Anpresselemente (13.1, 13.2) des Pressschuhes zu deaktivieren und/oder die Schuhpresseinheit 5 abzuschwenken. Eine Beschädigung oder Beeinträchtigung des wasseraufnehmenden Trägerbandes 11 oder des wasserundurchlässiges Pressbandes 12 können somit vermieden werden.The machine 1 according to the invention comprises a headbox which emits a fibrous suspension between a peripheral outer sieve and a circulating water-absorbing carrier band 11 in the form of a jet. The water-absorbing carrier tape 11 is designed as felt. The outer screen and the felt 11 partially wrap around a forming roller. In the looping area, the pulp suspension is dewatered and the formed fibrous web 2 lying on the felt 11 is guided for further dewatering over an evacuated roll and through the press nip 10. The press nip 10 is formed by a press shoe 6 comprising a shoe press unit 5 and the drying cylinder 10. Immediately after the press nip 10, the fibrous web 2 is transferred to the hot surface of the cylindrical part 8 of the steam-heated drying cylinder 7 and dried. The drying cylinder 7 is partially surrounded by a drying hood 14 for impinging the fibrous web 2 with steam and / or hot air. Thereafter, the fibrous web 2 is creped by a creping doctor and removed from the surface of the cylindrical portion 8 of the steam-heated drying cylinder 7 and fed via a measuring frame for measuring quality parameters of the fibrous web 2 of the reeling. The shoe press unit 5 comprises two, each in the transverse direction 4 extending and in the web running direction 3 juxtaposed, pressing elements (13.1, 13.2) for pressing the press shoe 6 against the drying cylinder 7. The pressing elements (13.1, 13.2) are designed as pressure hoses. The pressure hoses are pressurized independently of each other. Thus, the profile of the pressing pressure in the web running direction 3 can be adapted to the given production conditions. For example the maximum pressing pressure itself and also its position in the web running direction 3 can be set exactly. Thus, for example, for a high dewatering performance, the second contact pressure element (13.2), viewed in the web running direction 3, is pressed more strongly than the first pressure element (13.1). The exact adjustment of the compression pressure profiles in the transverse direction 4 and in the web running direction 3 is particularly at high heat flux densities, as they are possible by using a drying cylinder 7 made of steel advantage. The steam-heated drying cylinder 7 comprises an end cap on the front side. In this exemplary embodiment, the cylindrical part 8 of the drying cylinder 7 and the two end covers 9 made of steel. These are welded to the cylindrical part 8. This allows a higher heat flow. The front cover 9 are executed on its outside with a thermal insulation. This reduces heat losses and improves the energy balance. The drying cylinder 7 has a diameter of 4.8 m and the interior can be acted upon with steam at a pressure of 0.7 MPa (7 bar). The cylindrical part 8 has an outer coating to assist the creping process. The press nip 10 has a length of 55 mm in the web running direction 3. As a result, a higher maximum pressing pressure in the press nip 10 can be achieved for a given maximum line force. The press shoe 6 is pressed against the drying cylinder 7 to form the press nip 10. The press shoe 6 is made of metal, in particular bronze or aluminum and has a ground surface. As a result, a uniform pressure profile in the transverse direction 4 to the machine 1 and in the web running direction 3 is achieved. This in turn results in improved transverse moisture profiles and longitudinal moisture profiles in the fibrous web 2 and thus improves the quality of the fibrous web 2 produced. To improve the operational reliability, the shoe press unit 5 is assigned a safety device for opening the press nip 10, comprising a control or regulating unit. or control unit, in the absence of the fibrous web 2 on the water-absorbing carrier tape 11, causes the pressing elements (13.1, 13.2) of the press shoe to be deactivated and / or the shoe press unit 5 to be swiveled. Damage to or impairment of the water-absorbing carrier tape 11 or the water-impermeable press belt 12 can thus be avoided.

Die Figur 2 zeigt einen Ausschnitt der Figur 1 mit einer Schuhpresseinheit 5 und einem Trockenzylinder 7 in vereinfachter Darstellung. Die Schuhpresseinheit 5 umfasst einen Pressschuh 6 und Anpresselemente (13.1, 13.2), welche sich auf einem maschinenbreiten und in den Randbereichen der Maschine 1 gelagerten Joch, abstützen. Diese Elemente sind von einem umlaufenden, wasserundurchlässigen Pressband 12 umgeben. Der Innenraum des wasserundurchlässigen Pressbandes 12 ist gegenüber der Umgebung abgedichtet. Die beiden Anpresselemente (13.1, 13.2) erstrecken sich jeweils in Querrichtung 4 und sind in Bahnlaufrichtung 3 nebeneinander angeordnet. Sie pressen den Pressschuh 6 unter Ausbildung eines Pressspaltes 10 gegen den Trockenzylinder 7. Die Anpresselemente (13.1, 13.2) sind als Druckschläuche ausgebildet. Dadurch entsteht eine stetige Anpresskraft über den gesamten Pressspalt 10 in Querrichtung 4. Die Druckschläuche sind unabhängig voneinander mit Druck beaufschlagbar. Somit lässt sich das Profil des Pressdruckes in Bahnlaufrichtung 3 den gegebenen Produktionsbedingungen anpassen. Beispielsweise kann der maximale Pressdruck selbst und auch dessen Lage in Bahnlaufrichtung 3 genau eingestellt werden. So wird beispielsweise für eine hohe Entwässerungsleistung das in Bahnlaufrichtung 3 betrachtet zweite Anpresselement (13.2) stärker angepresst als das erste Anpresselement (13.1).The FIG. 2 shows a part of the FIG. 1 with a shoe press unit 5 and a drying cylinder 7 in a simplified representation. The shoe press unit 5 comprises a press shoe 6 and pressing elements (13.1, 13.2) which are supported on a machine-width yoke mounted in the edge regions of the machine 1. These elements are surrounded by a circumferential, water-impermeable press belt 12. The interior of the water-impermeable press belt 12 is sealed from the environment. The two pressing elements (13.1, 13.2) each extend in the transverse direction 4 and are arranged next to one another in the web running direction 3. They press the press shoe 6 to form a press nip 10 against the drying cylinder 7. The pressing elements (13.1, 13.2) are designed as pressure hoses. This creates a steady contact pressure over the entire press nip 10 in the transverse direction 4. The pressure hoses are independently pressurized. Thus, the profile of the pressing pressure in the web running direction 3 can be adapted to the given production conditions. For example, the maximum pressing pressure itself and also its position in the web running direction 3 can be set accurately. Thus, for example, for a high dewatering performance, the second contact pressure element (13.2), viewed in the web running direction 3, is pressed more strongly than the first pressure element (13.1).

Die Figur 3 zeigt einen Pressschuh 6 in vereinfachter Darstellung aus der Maschine 1 entsprechend Figur lund einen Pressdruckverlauf im Pressspalt 10 in Bahnlaufrichtung 3. Der Pressschuh 6 weist im Bereich des Pressspaltes 10 eine mittlere Pressschuhdicke 15 auf, welche kleiner als 20 mm ist. Dies hat den Vorteil, dass das Pressdruckprofil in Querrichtung 4, insbesondere in den Randbereichen des Pressspaltes 10, gleichmäßig und konstant verläuft. Die Auswirkungen geometrischer Abweichungen des Trockenzylinders 7 beispielsweise in den Randbereichen infolge des Dampfdruckes und den unterschiedlichen thermischen Bedingungen zwischen der Trockenzylindermitte und den beiden Randzonen können so ausgeglichen werden. Der biegeweich ausgeführte Pressschuh 10 kann sich an die Kontur des Trockenzylinders im Betrieb der Maschine anschmiegen, so dass der Pressdruckverlauf in Querrichtung 4 konstant ist. Da der Pressschuh 6 an den Durchmesser des Trockenzylinders 7 angepasst ist, ist die Pressschuhdicke (15.1, 15,2) in Bahnlaufrichtung 3 nicht ganz konstant. Etwa in der Mitte des Pressspaltes 10 ist die Pressschuhdicke dadurch geringfügig dünner als am Beginn und am Ende des Pressspaltes 10. Die mittlere Pressschuhdicke ist daher der Mittelwert der Werte der Pressschuhdicke (15.1, 15,2) am Anfang, in der Mitte und am Ende des Pressspaltes 10. Der Pressschuh weist Bereich des Pressspaltes 10 eine mittlere Pressschuhdicke (15) auf, welche als 10 mm, ist. Der Pressschuh 10 weist also eine Mindestdicke auf, welche zum einen ein gleichmäßiges Pressdruckprofil in Bahnlaufrichtung 3 über den gesamten Pressspalt ermöglicht. Diese daraus resultierende Mindestbiegesteifigkeit gewährleistet eine konstante Lage des Pressspaltendes in Bahnlaufrichtung 3 und dies über die gesamte Breite des Pressspaltes in Querrichtung 4. Durch die scharfe Begrenzung des Pressspaltendes lässt sich ein sehr starker und auch über die Breite konstanter Druckabfall des Pressdruckes am Ende des Pressspaltes 10 erreichen. Eine Rückbefeuchtung der Faserstoffbahn 2 durch das wasseraufnehmende Trägerband 11 am Ende des Pressspaltes 10 kann vermieden oder zumindest stark reduziert werden. Die Entwässerungseffizienz wird dadurch erheblich gesteigert. Feuchtestreifen in der Faserstoffbahn durch ungleichmäßige Rückbefeuchtung können durch den hohen und über die Breite konstanten Druckabfall vermieden werden.The FIG. 3 shows a press shoe 6 in a simplified representation of the machine 1 according to Figure l and a pressure profile in the press nip 10 in the web running direction 3. The press shoe 6 has in the region of the press nip 10, an average press shoe thickness 15, which is smaller than 20 mm. This has the advantage that the pressing pressure profile in the transverse direction 4, in particular in the edge regions of the press nip 10, runs uniformly and constantly. The effects of geometric variations of the drying cylinder 7, for example in the edge regions due to the vapor pressure and the different thermal conditions between the drying cylinder center and the two edge zones can be compensated. The flexible flexible press shoe 10 can conform to the contour of the drying cylinder during operation of the machine, so that the compression pressure profile in the transverse direction 4 is constant. Since the press shoe 6 is adapted to the diameter of the drying cylinder 7, the press shoe thickness (15.1, 15.2) in the web running direction 3 is not completely constant. Approximately in the middle of the press nip 10, the press shoe thickness is thereby slightly thinner than at the beginning and at the end of the press nip 10. The average press shoe thickness is therefore the mean of the values of the press shoe thickness (15.1, 15.2) at the beginning, in the middle and at the end of the press nip 10. The press shoe has an average press shoe thickness (15), which is 10 mm, of the press nip 10. The press shoe 10 thus has a minimum thickness, which on the one hand enables a uniform pressure profile in the web running direction 3 over the entire press nip. This resulting minimum bending stiffness ensures a constant position of the press nip end in Web running direction 3 and this over the entire width of the press nip in the transverse direction 4. The sharp boundary of the press nip can be a very strong and also across the width constant pressure drop of the pressing pressure at the end of the press nip 10 reach. A rewetting of the fibrous web 2 by the water-absorbing carrier tape 11 at the end of the press nip 10 can be avoided or at least greatly reduced. The drainage efficiency is thereby significantly increased. Moisture streaks in the fibrous web due to uneven remoistening can be avoided by the high and constant width pressure drop.

Über dem Pressschuh 6 ist schematisch ein Druckprofil in Bahnlaufrichtung 3 dargestellt. Der Pressdruck beginnt am Anfang des Pressschuhes 6 mit einem sanften Anstieg und erreicht kurz vor dem Ende des Pressschuhes 6 den maximalen Pressdruck, der bis zum Ende sehr steil abfällt. Durch die Mindestdicke und die Art der Anpressung des Pressschuhes 6 werden Werte im Druckabfall von mehr als 1000 kPa/mm konstant über die Breite in Querrichtung des Pressspalts 10 erreicht. Dies minimiert oder verhindert eine Rückbefeuchtung der Faserstoffbahn 2 durch das wasseraufnehmende Trägerband 11. Das sich im Pressspalt ergebende Druckprofil in Bahnlaufrichtung weist in diesem Beispiel bei einer Linienkraft von 120 kN/m einen Maximaldruck von 4,5 MPa auf.About the press shoe 6, a pressure profile in the web running direction 3 is shown schematically. The pressing pressure begins at the beginning of the press shoe 6 with a gentle rise and reached shortly before the end of the press shoe 6, the maximum pressing pressure, which drops very steeply to the end. Due to the minimum thickness and the type of pressing of the press shoe 6, values in the pressure drop of more than 1000 kPa / mm are constantly achieved across the width in the transverse direction of the press nip 10. This minimizes or prevents rewetting of the fibrous web 2 by the water-absorbing carrier tape 11. The resulting in the press nip pressure profile in the web running direction has in this example at a line force of 120 kN / m, a maximum pressure of 4.5 MPa.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Maschinemachine
22
FaserstoffbahnFibrous web
33
BahnlaufrichtungWeb direction
44
Querrichtungtransversely
55
SchuhpresseinheitShoe press unit
66
Pressschuhpress shoe
77
Trockenzylinderdrying cylinders
88th
zylindrischer Teil des Trockenzylinderscylindrical part of the drying cylinder
99
Stirndeckelfront cover
1010
Pressspaltpress nip
1111
wasseraufnehmendes Trägerbandwater-absorbing carrier tape
1212
wasserundurchlässiges Pressbandwatertight press belt
13.113.1
Anpresselementpresser
13.213.2
Anpresselementpresser
1414
Trocknungshaubedrying hood
1515
mittlere Pressschuhdickemedium press shoe thickness
15.115.1
maximale Pressschuhdickemaximum press shoe thickness
15.215.2
minimale Pressschuhdickeminimum press shoe thickness

Claims (17)

  1. Machine (1) for producing a fibrous web (2), in particular a tissue or hygienic paper web, or a fibrous web (2) that is smooth on one side, having at least one press nip (10) that is formed between a shoe press unit (5) comprising a press shoe (6) and a steam-heated drying cylinder (7); a water-absorbing carrier belt (11), a water-impermeable press belt (12), and the fibrous web (2) being guided through said press nip (10); wherein the drying cylinder (7) comprises a cylindrical part (8) and at the end sides in each case one end cap (9), wherein the fibrous web (2) directly after the press nip (10) is transferred to and dried on the hot surface of the cylindrical part (8) of the steam-heated drying cylinder (7), and wherein the cylindrical part (8) of the drying cylinder (7) is at least partially composed of steel,
    characterized in that
    the water-absorbing carrier belt (11) is embodied as a felt belt, and in that the cylindrical part (8) of the drying cylinder (7) has a coating.
  2. Machine (1) according to Claim 1,
    characterized in that
    the formed press nip (10) in the web running direction (3) has a length of less than 125 mm, in particular of less than 80 mm, preferably of less than 70 mm, in particular of less than 60 mm.
  3. Machine (1) according to Claim 2,
    characterized in that
    the press shoe (6) for forming the press nip (10) is pressed against the drying cylinder (7), and is composed of metal, in particular of bronze or aluminium.
  4. Machine (1) according to one of the preceding claims,
    characterized in that
    the shoe press unit (5) for pressing the press shoe (6) against the drying cylinder comprises at least two contact pressure elements (13.1, 13.2) that are disposed beside one another in the web running direction (3) and in each case extend in the cross direction (4).
  5. Machine (1) according to Claim 4,
    characterized in that
    the contact pressure elements (13.1, 13.2) in the cross direction (4) extend across the entire press nip (10).
  6. Machine (1) according to one of the preceding claims,
    characterized in that
    the press shoe (6) at least in the region of the press nip (10) has a mean press shoe thickness (15) which is equal to or smaller than 20 mm, in particular equal to or smaller than 18 mm, preferably equal to or smaller than 16 mm.
  7. Machine (1) according to one of the preceding claims,
    characterized in that
    the press shoe (6) at least in the region of the press nip (10) has a mean press shoe thickness (15) which is equal to or larger than 10 mm, in particular equal to or larger than 12 mm, preferably equal to or larger than 14 mm.
  8. Machine (1) according to one of the preceding claims,
    characterized in that
    the end caps (9) that are disposed at the end sides of the cylindrical part (8) of the drying cylinder (7) are of steel and are screwed or welded to the cylindrical part (8) of the drying cylinder (7), or the end caps (9) are of cast iron and are screwed to the cylindrical part of the drying cylinder.
  9. Machine (1) according to one of the preceding claims,
    characterized in that
    the drying cylinder (7) is assigned a dryer hood (14) for impinging the fibrous web (2) with steam and/or hot air.
  10. Machine (1) according to one of the preceding claims,
    characterized in that
    the drying cylinder (7) has a diameter of more than 3 m, in particular of more than 4 m, and the interior is capable of being impinged with steam at a pressure of equal to or greater than 0.5 MPa (5 bar), in particular of equal to or greater than 0.6 MPa (6 bar), preferably of equal to or greater than 0.7 MPa (7 bar).
  11. Machine (1) according to one of the preceding claims,
    characterized in that
    the shoe press unit (5) for opening the press nip (10) is assigned a safety device comprising a controlling or regulating unit, wherein the controlling or regulating unit in the absence of the fibrous web (2) on the water-absorbing carrier belt (11) initiates the deactivation of the contact pressure elements (13.1, 13.2) and/or the downward pivoting of the shoe press unit (5).
  12. Machine (1) according to one of the preceding claims,
    characterized in that
    the press shoe is capable of being pressed against the drying cylinder (7) by way of a linear force of equal to or more than 90 kN/m, in particular of equal to or more than 110 kN/m, preferably of equal to or more than 120 kN/m.
  13. Machine (1) according to one of the preceding claims,
    characterized in that
    the pressure profile that results in the web running direction (3) in the press nip (10) at the end of the press nip (10) at a linear force of less than or equal to 140 kN/m, in particular of less than or equal to 120 kN/m, has a maximum pressure of more than 2 MPa, in particular more than 3 MPa, and preferably more than 4 MPa.
  14. Machine (1) according to one of the preceding claims,
    characterized in that
    the pressure profile that results in the web running direction (3) in the press nip (10) at the end of the press nip (10) has a pressure drop of more than 800 kPa/mm, in particular of more than 1000 kPa/mm, preferably of more than 1100 kPa/mm.
  15. Machine (1) according to one of the preceding claims,
    characterized in that
    the end caps (9) on the external side have a thermal insulation.
  16. Machine (1) according to one of the preceding claims,
    characterized in that
    the machine (1) comprises a headbox which between a revolving outer screen and a revolving water-absorbing carrier belt (11) dispenses a fibrous suspension in the form of a jet, and the outer screen and the water-absorbing carrier belt (11) partially wrap a forming roller, and wherein the fibrous suspension is dewatered in the wrapped region, and the formed fibrous web (2) for further dewatering is guided, so as to lie on the water-absorbing carrier belt (11), by way of a suctioned roller and through the press nip (10).
  17. Method for producing a fibrous web (2), in particular a tissue or hygienic paper web, or a fibrous web (2) that is smooth on one side, wherein the fibrous web (2) and a water-absorbing carrier belt (1.1) and a water-impermeable press belt (12) are guided through at least one press nip (10) that is formed between a shoe press unit (5) comprising a press shoe (6) and a steam-heated drying cylinder (7), wherein the drying cylinder (7) comprises a cylindrical part (8) and at the end sides in each case one end cap (9), and wherein the cylindrical part (8) of the drying cylinder (7) is at least partially configured from steel,
    characterized in that
    the water-absorbing carrier belt (11) is embodied as a felt belt, and in that the cylindrical part (8) of the drying cylinder (7) has a coating.
EP15710756.6A 2014-07-11 2015-03-13 Machine for the production of a fiber web Active EP3167115B1 (en)

Applications Claiming Priority (2)

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DE102014213512.5A DE102014213512A1 (en) 2014-07-11 2014-07-11 Machine for producing a fibrous web
PCT/EP2015/055284 WO2016005064A1 (en) 2014-07-11 2015-03-13 Machine for the production of a fiber web

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EP3167115A1 EP3167115A1 (en) 2017-05-17
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CN (1) CN106661836B (en)
BR (1) BR112017000527A2 (en)
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WO (1) WO2016005064A1 (en)

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BR112017000527A2 (en) 2017-11-14
EP3167115A1 (en) 2017-05-17
WO2016005064A1 (en) 2016-01-14
CN106661836A (en) 2017-05-10
DE102014213512A1 (en) 2016-01-14
CN106661836B (en) 2019-12-03

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