EP3974576A1 - Machine et procédé de fabrication d'une bande de matière fibreuse - Google Patents

Machine et procédé de fabrication d'une bande de matière fibreuse Download PDF

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Publication number
EP3974576A1
EP3974576A1 EP21180040.4A EP21180040A EP3974576A1 EP 3974576 A1 EP3974576 A1 EP 3974576A1 EP 21180040 A EP21180040 A EP 21180040A EP 3974576 A1 EP3974576 A1 EP 3974576A1
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EP
European Patent Office
Prior art keywords
fibrous web
smoothing
underside
yankee cylinder
web
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.)
Granted
Application number
EP21180040.4A
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German (de)
English (en)
Other versions
EP3974576C0 (fr
EP3974576B1 (fr
Inventor
Tobias Kolhagen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
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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 EP3974576A1 publication Critical patent/EP3974576A1/fr
Application granted granted Critical
Publication of EP3974576C0 publication Critical patent/EP3974576C0/fr
Publication of EP3974576B1 publication Critical patent/EP3974576B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • D21F5/02—Drying on cylinders
    • D21F5/04—Drying on cylinders on two or more drying cylinders
    • 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
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • 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
    • D21F5/18—Drying webs by hot air
    • D21F5/181—Drying webs by hot air on Yankee cylinder
    • 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

Definitions

  • the invention relates to a machine for producing a fibrous web, in particular a paper or cardboard web, with a headbox, a forming unit, a press section, a pre-dryer section, a MG smoothing Yankee cylinder and a take-up. It also relates to a method for producing a fibrous web, in particular a paper or cardboard web, which can be carried out in particular using such a machine.
  • the paper web is guided after the press section over a large, steam-heated cylinder, a so-called smoothing or Yankee cylinder.
  • a so-called smoothing or Yankee cylinder is used on the one hand to dry the paper web.
  • the paper web is smoothed on its side facing the smoothing or Yankee cylinder due to the long contact with the smooth and hot surface of the smoothing or Yankee cylinder.
  • MG machine glazed
  • Specialty papers coated on one side are currently produced on such MG machines. These machines only have one Yankee cylinder (GZ) to dry the fibrous web. The production capacity or speed of these machines is imitated by the size or drying capacity of the yankee cylinder.
  • the maximum raw paper capacity is approx. 35 t/m,d with a Yankee cylinder with a diameter of 6 m and a gas-heated hood and a raw paper weight of 30 - 60 g/m 2 .
  • a pre-dryer section before the Yankee cylinder and a Yankee cylinder with the largest possible diameter are required.
  • the Yankee cylinder is arranged on top.
  • a film press SpeedSizer
  • the primer is usually applied to the smooth side facing the Yankee cylinder and starch to the side facing away from the Yankee cylinder.
  • the top coat is applied with a so-called BladeCoater, ie a coating unit with a coating knife. BladeCoater, and curl control with a so-called LAS (Liquid Application System), ie a special application unit with assigned roller or a nozzle moistener for moistening the back of the web, ie on the side facing away from the coat.
  • LAS Liquid Application System
  • Calendering also takes place online with two to four soft nips at a linear force of up to 350 N/mm or more using thermal rollers with a surface temperature in the range of 150° to 200° on the side facing away from the Yankee cylinder.
  • a currently customary high-performance MG machine is designed for a speed of 1200 m/min for base paper with a basis weight of 20 to 25 g/m 2 .
  • Such an MG machine comprises a hydraulic headbox with dilution water technology, a fourdrinier wire with a hybrid former with a fourdrinier wire and an attached top wire and a shaker, a DuoCentri-NipcoFlex press with three press nips, at least one of which is intended as a shoe press nip, or a tandem -NipcoFlex press with two shoe press nips arranged one behind the other in the direction of web travel, a one- and/or two-row pre-dryer section, a Yankee cylinder with a diameter of 6.4 m, a post-dryer section with a variable number of drying cylinders in a two-row arrangement, a film press, a BladeCoater and a soft calender with a five-roll stack and four nips.
  • the first line concept is designed for speeds of up to 800 m/min and a basis weight range of 22 to 50 g/m 2 .
  • the Paper web from the press section placed directly on the MG cylinder with the paper web underside, which enables the highest surface properties (gloss, porosity, smoothness) at relatively low speeds.
  • the second line concept is designed for speeds of up to 1000 m/min and a basis weight range of 22 to 80 g/m 2 .
  • the paper web coming out of the press section is pre-dried via a single-tier pre-dryer section on the paper web underside and also placed with the paper web underside on the MG cylinder, which enables medium surface properties (gloss, porosity, smoothness) at medium speeds.
  • the third line concept is designed for speeds of up to 1400 m/min and a basis weight range of 25 to 110 g/m 2 .
  • the paper web coming out of the press section is pre-dried again via a single-row pre-dryer section on the underside of the paper web and then laid again with this underside of the paper web on the MG cylinder.
  • the MG cylinder is followed by a two-row after-dryer section to achieve the final dry content.
  • This third system concept enables average surface properties (gloss, porosity, smoothness) at high speeds.
  • the machines that are currently in increasing demand are designed for speeds >1000 m/min and have a machine width >5 m. Accordingly, the second plant concept and the third plant concept are in the economic focus.
  • the papers manufactured with MG machines are characterized in particular by their low basis weight, high-quality surface properties, high dimensional stability, high rigidity and high strength. The corresponding quality requirements are met above all if the Paper web with a dry content in the range of 50 to 60% is placed on the MG smoothing Yankee cylinder and its surface properties can then develop over the long dwell time on the MG smoothing Yankee cylinder.
  • the moisture gradient i.e. the moisture distribution in the z-direction of the paper web
  • This moisture gradient intensifies when the basis weight increases, but this now entails a higher dry content on the underside of the paper web pressed against the MG Yankee Yankee cylinder.
  • the moisture on the underside of the paper web that comes into contact with the MG smoothing Yankee cylinder should be as high as possible. Relatively low basis weights are therefore desirable.
  • the moisture content on the underside of the paper web before it hits the MG Yankee cylinder is lower than on the upper side of the paper web, which means that the underside of the web is actually the "wrong side" for achieving high or very high quality properties.
  • the accompanying drawing shows how the moisture gradient changes on the underside of the fibrous or paper web as a result of pre-drying developed. This results in a lower moisture content on the underside of the fiber or paper web that comes into contact with the MG smoothing Yankee cylinder than on the upper side.
  • the known machine and method for producing a fibrous web counteracts this problem in that the pre-dryer section includes a so-called "DuoDryerCC", ie a drying group with drying cylinders that follow one another in the vertical direction and are in particular steam-heated for drying the side of the fibrous web that is remote from the MG smoothing Yankee cylinder.
  • DuoDryerCC a drying group with drying cylinders that follow one another in the vertical direction and are in particular steam-heated for drying the side of the fibrous web that is remote from the MG smoothing Yankee cylinder.
  • the invention is based on the object of specifying a machine and a method of the type mentioned at the outset, in which the disadvantages mentioned above are eliminated.
  • the aim here is to enable the most efficient possible production of high-quality special papers, in particular special papers coated on one side, with the machine having the highest possible runability, ie good running properties, and relatively low basis weights of the fibrous web.
  • the machine according to the invention for producing a fibrous web comprises a headbox, a forming unit, a press section, a pre-dryer section, a MG smoothing Yankee cylinder and a take-up unit.
  • the pre-dryer section for one-sided pre-drying of the fibrous web is designed on the underside, provided as a MG smoothing Yankee cylinder, an overhead MG smoothing Yankee cylinder with which the underside of the fibrous web is brought into contact, and in the direction of web travel after the pre-dryer section and before the emergence or transfer of the fibrous web to the MG smoothing Yankee cylinder, a remoistening device for one-sided remoistening of the fibrous web on its underside and accordingly for the development of the moisture gradient in z- Direction of the fibrous web is provided in the direction of the underside.
  • the remoistening device is preferably positioned as close as possible in front of the MG smoothing Yankee cylinder, so that the dwell time of the applied water is as short as possible, in order to avoid deep penetration into the fibrous web.
  • this is achieved in that before the fibrous web runs onto the MG smoothing Yankee cylinder, the fibrous web is remoistened on one side on its underside by means of the remoistening unit, which means that before the fibrous web runs onto the MG smoothing Yankee cylinder, a shift again, i.e increasing the moisture gradient on the underside facing the MG smoothing Yankee cylinder.
  • the reduction in surface moisture caused by the one-sided underside pre-drying on the Web underside can thus at least be compensated.
  • both are thus achieved, on the one hand a fast-running and draft-free machine and on the other hand an optimal quality development on the underside of the fibrous web corresponding to a slow machine.
  • the underside of the fibrous web is preferably remoistened by the remoistening device in such a way that at least essentially only the underside surface of the fibrous web is wetted. This ensures that only the surface of the underside of the fibrous web is wetted and that the remoistening medium, viewed in the thickness direction of the fibrous web, is not transported into the middle of the fibrous web.
  • the quality optimization in question should only be achieved on the surface of the underside of the fibrous web.
  • the remoistening medium applied to the underside of the fibrous web with the remoistening device contains at least essentially only water or a water/steam mixture. It is also ensured once again that the remoistening medium, viewed in the direction of thickness, is not transported into the middle of the fibrous web, but only wets the surface of the underside of the web.
  • the moistening medium is preferably applied in the form of small droplets by the remoistening device. This can prevent staining.
  • the shell of the MG smoothing Yankee cylinder can be made of steel instead of cast iron.
  • the jacket surface can be metallized. This coating enables a particularly high paper surface quality to be achieved.
  • the application quantity of the remoistening medium applied to the underside of the fibrous web by means of the remoistening device is advantageously in the range of less than 1.0 g/m 2 , for example 0.5 g/m 2 .
  • Such an application amount should be sufficient for wetting the surface of the underside of the web.
  • the water droplet size is preferably as small as possible in order to achieve uniform wetting of the surface. Evaporation rate calculations show that no additional or only slightly increased drying capacity is required for this small application quantity.
  • the remoistening of the underside of the fibrous web by the remoistening device is expediently carried out in the area of a deflection roller provided in the direction of web travel directly in front of the MG smoothing Yankee cylinder.
  • the fibrous web is optimally supported in the area of such a deflection roller, which is advantageous for the application of the remoistening medium.
  • the remoistening device preferably comprises a moistening unit for sectional moistening of the fibrous web across its width and for variable adjustment of its moisture cross profile.
  • a press nip of the press can be assigned a steam box to increase dewatering. This should be designed in such a way that the moisture cross profile can be set additionally or alone.
  • the remoistening by the remoistening device can be controlled and/or regulated depending on the measurement of the surface quality of the fibrous web.
  • the remoistening device can in particular be pivotable. Among other things, this facilitates the original threading of the fibrous web onto the MG smoothing Yankee cylinder.
  • the fiber web is expediently transferred to the MG smoothing Yankee cylinder in the area of a pressure roller applied to the MG smoothing Yankee cylinder.
  • a so-called NipcoFullFlex roll i.e. a deflection compensation roll with a FullFlex cover
  • a NipcoFullFlex roll differs from a shoe roll, among other things, in that no concave shoe is used as the source of support, but rather several closely spaced, side-by-side convex sources of support over the length of the roll or width of the machine.
  • the jacket consists of a CFRP jacket with an outer coating of polyurethane. Such a jacket is more flexible than a steel or cast iron jacket, so that it can adapt better to a changing contour of the MG smoothing Yankee cylinder. With one like this
  • the pressure roller arranged on the MG smoothing Yankee cylinder results in good adaptation to a respective smoothing or Yankee cylinder deformation, a uniform linear force distribution in the transverse direction and uniform quality properties in terms of thickness, smoothness and gloss.
  • the MG smoothing Yankee cylinder is preferably assigned at least one in particular gas-, preferably steam-heated hood, which ensures a high drying capacity and high production.
  • the fibrous web runs onto the MG smoothing Yankee cylinder with a dry content in the range from 40% to 60%.
  • the fibrous web is guided through the machine with support, at least starting from the end of the press section to the MG Yankee cylinder. This is achieved by a completely closed web run.
  • a post-dryer section with at least one two-tier dryer group can be provided downstream of the MG smoothing Yankee cylinder in the web travel direction, through which the fibrous web is guided again with support.
  • a scanner for controlling and/or regulating the underside surface properties of the fibrous web in the direction of web travel immediately before winding or directly after the MG smoothing Yankee cylinder, with preference being given to controlling and/or regulating the underside surface properties of the fibrous web the application quantity of the applied to the underside of the fibrous web by means of the remoistening device Remoistening medium is selectively variably adjustable over the width of the fibrous web via a quality control system depending on at least one measurement signal from the scanner.
  • the amount of water applied to the fibrous web can be varied in the transverse direction by means of a corresponding measurement signal from the scanner to optimize the web quality, which means, for example, that a CD 2 sigma value that is even better representative of the surface quality can be achieved.
  • the line load of a calender provided after the MG smoothing Yankee cylinder can thus be reduced, which means that even higher specific volume values are possible for the paper grades in question.
  • a smoothing device and/or a coating device are provided between the MG smoothing Yankee cylinder and the winder, the smoothing device preferably being a pre-calender, in particular a soft smoothing stack with a stack comprising two rolls , includes a hard nip or a belt calender, and/or the diameter of the MG smoothing Yankee cylinder is greater than 6 m, in particular greater than 6.6 m and preferably greater than 7 m, and/or the machine is a film press for surface treatment of the comprises a fibrous web, and/or the machine comprises a calendering unit with preferably a multi-roll soft nip calender with at least one elastic nip and/or a shoe calender with a smooth press cover for smoothing the fibrous web, and/or the press section has a NipcoFullFlex roll with a one Composite jacket having press roller and / or a transfer rband on the underside
  • a uniform compaction and thickness calibration is achieved.
  • a primer on the side of the fibrous web facing the MG smoothing Yankee cylinder and Starch can be applied to the side of the fibrous web facing away from the MG smoothing Yankee cylinder.
  • the press section can in particular also be a single, combi, DuoCentri or tandem NipcoFlex press with two separate nips, both nips being designed as shoe press nips and a shoe press nip against a central roll or a NipcoFlex press with only one shoe press nip and in particular upper felt and lower transfer belt or double felting or a tandem NipcoFlex press with two consecutive shoe presses.
  • the designation "NipcoFlex" stands for a shoe press roll of a press.
  • DuoCentri-NipcoFlex press stands for a compact press with a central roll that forms two press nips together with two press rolls, with one press roll being designed as a shoe press roll.
  • the fibrous web produced with the MG machine according to the invention is characterized in particular by a low basis weight, high-quality surface properties, high dimensional stability, high rigidity and high strength.
  • the method according to the invention for producing a fibrous web, in particular a paper or cardboard web which can be carried out in particular using the machine according to the invention, is accordingly characterized in that a fibrous stock suspension fed by means of a headbox is dewatered in a forming unit to form a fibrous web, the fibrous web continues in a press section dewatered, pre-dried in a pre-dryer section, calendered in an MG smoothing Yankee cylinder and wound up in a take-up, with the underside of the fibrous web being pre-dried on one side in the pre-dryer section, the underside of the fibrous web being brought into contact with the MG smoothing Yankee cylinder above is and the fibrous web in Web direction after the pre-dryer section and before the fibrous web runs onto the MG smoothing Yankee cylinder by means of a remoistening device on one side on the underside of which to develop the moisture gradient in the z-direction of the fibrous web in the direction of its underside.
  • FIG. 1 shows a schematic representation of the moisture gradient development in the z-direction of the fibrous web resulting from the one-sided pre-drying of the fibrous web on its underside.
  • the Figures 2 and 3 show a schematic representation of purely exemplary embodiments of the machine according to the invention for producing a fibrous web, in particular a paper or cardboard web, with which, with the highest possible runability of the machine and relatively low basis weights of the fibrous web, at the same time in particular also the most efficient possible production of high-quality, in particular special papers coated on one side is made possible.
  • the two include in the Figures 2 and 3 machines 10 shown each have a headbox, a forming unit 12, a press section 14, a pre-dryer section 16, a MG Yankee cylinder 18 and a take-up unit 20.
  • the pre-drying section 16 is designed for one-sided pre-drying of the fibrous web on its underside.
  • an overhead MG smoothing Yankee cylinder 18 is provided as the MG smoothing Yankee cylinder 18, with which the underside of the fibrous web is brought into contact.
  • a remoistening device 22 for one-sided remoistening of the fibrous web on its underside and accordingly for the development of the moisture gradient in the z-direction of the fibrous web in the direction of the latter underside provided.
  • the one-sided pre-drying of the fibrous web on its underside is caused Shifting of the moisture content to the top side of the web is at least compensated again, as a result of which optimum surface qualities can be achieved on the underside of the fibrous web which comes into contact with the MG smoothing Yankee cylinder 18 .
  • the most efficient possible production of high-quality special papers, in particular special papers coated on one side is thus ensured.
  • the remoistening of the underside of the fibrous web by the remoistening device can in particular take place in such a way that at least essentially only the underside surface of the fibrous web is wetted.
  • remoistening device 22 In order to counteract the penetration of moisture into the middle of the fibrous web, this can be done by means of the remoistening device 22 on the Underside of the fibrous web applied remoistening medium contain at least essentially only water or a water / steam mixture.
  • the application quantity of the remoistening medium applied to the underside of the fibrous web by means of the remoistening device 22 is in the range of less than 1.0 g/m 2 , for example 0.5 g/m 2 , practically no further drying capacity is required.
  • the underside of the fibrous web is remoistened by the remoistening device 22 in the area of a deflection roller 24 provided in the direction of web travel L immediately in front of the MG smoothing Yankee cylinder 18, i.e. in an area in which the fibrous web is optimally supported.
  • the remoistening device 22 can each comprise a moistening unit for sectional moistening of the fibrous web across its width and for variable adjustment of its transverse moisture profile.
  • the remoistening device 22 can also be pivotable.
  • the fibrous web can be transferred to the MG smoothing Yankee cylinder 18 in the area of a pressure roller 26 applied to the MG smoothing Yankee cylinder 18, in particular a NipcoFullFlex press roller with an elastic jacket.
  • a NipcoFullFlex press roll is a deflection-compensating roll with a composite cover (elasticle cover), which is significantly more flexible than a steel or cast iron cover and can therefore follow the contour of the MG smoothing Yankee cylinder 18 better.
  • a NipcoFullFlex roll lifts differs from a shoe roll, inter alia, in that a concave shoe is not used as the support source, but instead several closely spaced, side-by-side convex support sources are provided over the length of the roll or width of the machine.
  • the jacket consists of a CFRP jacket with an outer coating of polyurethane. Such a jacket is more flexible than a steel or cast iron jacket, so that it can adapt better to a changing contour of the counter-element, such as the MG smoothing Yankee cylinder 18 . Therefore it is called an Elastmantel.
  • the MG smoothing Yankee cylinder 18 can also be assigned at least one, in particular gas-, preferably steam-heated, hood 28 .
  • a particularly high surface quality on the underside of the fibrous web brought into contact with the MG smoothing Yankee cylinder 18 can be achieved if the fibrous web runs onto the MG smoothing Yankee cylinder 18 with a dry content in the range from 40% to 60%.
  • the fibrous web is guided through the machine 10 with support, at least starting from the end of the press section up to the MG Yankee cylinder 18 .
  • exemplary embodiment of the machine 10 according to the invention comprises the press section 14, for example, only one press nip.
  • no after-dryer section is provided in this embodiment.
  • a scanner can also be provided in the web travel direction L immediately before the take-up 20 or directly after the MG smoothing Yankee cylinder.
  • a quality system to selectively measure the application quantity of the remoistening medium applied to the underside of the fibrous web by means of remoistening device 22, depending on at least one measurement signal from the scanner, in order to control and/or regulate the underside surface properties of the fibrous web of the fibrous web can be set variably.
  • a smoothing device and/or a coating device can also be provided between the MG Yankee Yankee cylinder 18 and the winder 20, with the smoothing device preferably comprising a pre-calender, in particular a soft calender with a stack comprising two rolls, a hard nip or a belt calender.
  • the diameter of the MG smoothing Yankee cylinder 18 can in particular be greater than 6 m and in particular greater than 6.6 m, it being preferably greater than 7 m.
  • the respective machine can also include a film press for surface treatment of the fibrous web.
  • a calendering unit with in particular a multi-roll soft nip calender with at least one elastic nip and/or a shoe calender with a smooth press jacket for smoothing the fibrous web is also conceivable.
  • the press section 14 of the machines 10 can also each comprise a NipcoFullFlex roll with a press roll having a composite cover.
  • the first embodiment according to 2 having a forming unit 12 with only one wire and a press section 14 with only one press nip comprises the forming unit 12 according to the second embodiment 3 a hybrid former with a fourdrinier wire and an attached top wire, and the press section 14 of this second embodiment has two press nips.
  • the second embodiment also has an after-dryer section 30 with at least one two-row dryer group, through which the fibrous web is guided in a supported manner. In the present case, the final dry content is achieved by the after-dryer section 30 .
  • FIGS Figures 2 and 3 shows an enlarged schematic partial representation of the MG smoothing Yankee cylinder 18 of the two exemplary embodiments of the machine 10 according to the invention according to FIGS Figures 2 and 3 with a fibrous web running thereupon and previously acted upon by the respective remoistening device 22 on its underside.

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EP21180040.4A 2020-09-29 2021-06-17 Machine et procédé de fabrication d'une bande de matière fibreuse Active EP3974576B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102020125395.8A DE102020125395A1 (de) 2020-09-29 2020-09-29 Maschine und Verfahren zur Herstellung einer Faserstoffbahn

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EP3974576C0 EP3974576C0 (fr) 2023-07-26
EP3974576B1 EP3974576B1 (fr) 2023-07-26

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WO2024008405A2 (fr) 2022-07-05 2024-01-11 Voith Patent Gmbh Machine et procédé
DE102022119887A1 (de) 2022-08-08 2024-02-08 Voith Patent Gmbh Maschine und Verfahren
DE102022121998A1 (de) 2022-08-31 2024-02-29 Voith Patent Gmbh Walze und Pressvorrichtung

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DE202022104495U1 (de) 2022-07-05 2022-09-01 Voith Patent Gmbh Maschine
WO2024008405A2 (fr) 2022-07-05 2024-01-11 Voith Patent Gmbh Machine et procédé
DE102022119887A1 (de) 2022-08-08 2024-02-08 Voith Patent Gmbh Maschine und Verfahren
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EP3974576C0 (fr) 2023-07-26
CN114318930A (zh) 2022-04-12
CN114318930B (zh) 2023-07-21
DE102020125395A1 (de) 2022-03-31
EP3974576B1 (fr) 2023-07-26

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