EP3298193B1 - Verfahren und vorrichtung zur herstellung von hochgefüllten papieren - Google Patents

Verfahren und vorrichtung zur herstellung von hochgefüllten papieren Download PDF

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Publication number
EP3298193B1
EP3298193B1 EP16721778.5A EP16721778A EP3298193B1 EP 3298193 B1 EP3298193 B1 EP 3298193B1 EP 16721778 A EP16721778 A EP 16721778A EP 3298193 B1 EP3298193 B1 EP 3298193B1
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EP
European Patent Office
Prior art keywords
section
nozzle
turbulence
suspension
length
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.)
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Application number
EP16721778.5A
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German (de)
English (en)
French (fr)
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EP3298193A1 (de
Inventor
Wolfgang Ruf
Markus Häußler
Reinhard Leigraf
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
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Publication of EP3298193A1 publication Critical patent/EP3298193A1/de
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Publication of EP3298193B1 publication Critical patent/EP3298193B1/de
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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/026—Details of the turbulence section
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/028—Details of the nozzle section
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/18—Paper- or board-based structures for surface covering
    • D21H27/22—Structures being applied on the surface by special manufacturing processes, e.g. in presses
    • D21H27/26—Structures being applied on the surface by special manufacturing processes, e.g. in presses characterised by the overlay sheet or the top layers of the structures
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply

Definitions

  • the invention relates to a process for producing highly filled decorative papers for application to a carrier material, from an aqueous suspension, the suspension being applied by means of a headbox to a circulating drainage screen which comprises a turbulence generator with a plurality of turbulence channels arranged next to one another and forming a line, and the like Turbulence generator is immediately downstream of a nozzle, and the suspension is passed through the turbulence channels and through the nozzle to form a suspension jet.
  • the invention also relates to an apparatus for performing the method.
  • the residence time of the fiber suspension between the fluidization area and the point of impact of the jet on the screen of the sheet-forming unit should be as short as possible and below the reflocculation time.
  • a nozzle length of less than 500 mm is suggested. This process is suitable for fiber suspensions with increased consistency (fibers and fillers).
  • Decorative papers also count among the highly filled papers.
  • Decorative papers are special papers for the surface finishing of wood materials for the production of kitchen worktops, laminate floors, furniture and other end products.
  • the decor papers are laminated to carrier materials.
  • the surface of the decorative paper is printed with patterns, such as wood reproductions or with other single or multi-colored designs.
  • the decorative paper must have a very uniform formation, dimensional stability and smoothness in order to ensure the required optical properties of the finished products.
  • a certain strength of the decorative papers is also necessary for the further processing of the end products.
  • the decor papers are impregnated with resin. Uniform properties of the decorative papers are also necessary for this step in order to ensure a uniform penetration of the resin.
  • a process for the production of highly filled papers, in particular decorative papers for application to a carrier material, from an aqueous suspension is proposed, the suspension being applied by means of a headbox to a circulating dewatering screen, which has a turbulence generator with a plurality of turbulence channels arranged side by side, which form a line form, includes, and the turbulence generator is immediately followed by a nozzle, and the suspension is passed through the turbulence channels and through the nozzle to form a suspension jet.
  • the papers are produced from an aqueous suspension with a total consistency of more than 1.5%, a pulp density of less than 1.2% and an ash mass fraction of more than 30%, and at least 3 rows are arranged one above the other and the Suspension is passed through the turbulence channels with a maximum hydraulic diameter of less than 25 mm, in particular less than 20 mm and then through a nozzle with a length of more than 500 mm, in particular more than 700 mm.
  • lamellae are inserted which, starting at the turbulence generator, extend over at least part of the length of the nozzle.
  • the solution according to the invention enables adequate mixing of the components of the suspension on the one hand and a hydraulically very uniform material jet as a prerequisite for uniform dewatering and sheet formation.
  • the hydraulic instabilities in the suspension jet are reduced to such an extent that the flatness of the decorative paper is significantly improved.
  • faults and defects in the lamination process could be eliminated by the invention.
  • the invention has a particularly advantageous effect particularly at higher throughputs of the suspension of more than 4000 l / (min ⁇ m working width) and at speeds of the suspension jet of more than 400 m / min, since sufficient uniformity is achieved especially with increasing throughputs and speeds the nature of the highly filled papers, especially decorative papers, is becoming increasingly difficult.
  • the total density of the suspension can be up to 3% and more and the ash mass fraction can be up to 90%, preferably 50% to 80%.
  • the fiber density can be reduced to 0.8% and less, in particular to 0.6% and less, without impairing the quality of the decorative paper web. The invention therefore enables a wide range of decorative paper types to be produced with good quality.
  • the suspension is dewatered through the dewatering screen and then pressed, thermally dried and the paper web thus formed is wound up.
  • the highly filled paper web in particular the decorative paper web, can be impregnated, preferably with synthetic resin. This improves the processability.
  • the highly filled paper web produced in particular the decorative paper web, is provided for application to a carrier material by laminating. It is bonded to the carrier material under pressure and elevated temperature. As a result, end products such as kitchen worktops, laminate floors, furniture and others can be manufactured.
  • the turbulence channels viewed in the flow direction, comprise a first section and a second section and an end section with an outlet cross section. These sections have a hydraulic diameter which is calculated from the four-fold cross-sectional area divided by the circumference of the respective section of the turbulence channel. The ratio between the hydraulic diameter of the second section and the hydraulic diameter of the first section is greater than or equal to 1.25.
  • This cross-sectional expansion which can be carried out as a step change, generates sufficiently high shear forces and turbulence for sufficient mixing of the components of the suspension.
  • the sum of the lengths of the second section and of the end section is 4 to 10 times the root of the exit surface, where the exit area is given in mm 2 and the length in mm.
  • the second section can, for example, pass into the end section via a non-detachable diffuser. This helps to avoid or reduce hydraulic instabilities in the suspension jet and thus to improve the flatness of the highly filled paper, in particular the decorative paper, and to reduce faults and defects in the lamination process.
  • the second section contains the end section.
  • the second section also forms the outlet cross section with an outlet cross-sectional area.
  • the turbulence channel therefore has only two sections. The length of the second section is thus 4 to 10 times the root of the area of the outlet cross section, the area being given in the unit mm 2 and the length in the unit mm.
  • the length of the slats is the same or different.
  • the length of the fins is between 0.3 and 1.2 times, in particular between 0.5 and 0.8 times the length of the nozzle.
  • the nozzle has an inlet cross-section assigned to a line and the ratio between the area of the inlet cross-section and the sum of the outlet cross-sections of the turbulence channels of a line is less than 1.75, the inlet cross-section of the nozzle being the cross-section through which flow can pass. This avoids gross hydraulic instabilities in the suspension jet.
  • the area of the outlet cross section is advantageously less than 600 mm 2 , preferably less than 350 mm 2 .
  • the outlet cross section of the individual turbulence channels can be rectangular, square or hexagonal.
  • the suspension is passed through the nozzle with a gap width of the outlet gap in the range from 7 to 14 mm, in particular from 8 to 11 mm.
  • a headbox for carrying out the method according to claim 1 for the production of highly filled papers, in particular decorative papers for application to a carrier material is proposed.
  • the headbox comprises a turbulence generator with a plurality of turbulence channels arranged side by side, which form a row, the turbulence generator being immediately followed by a nozzle, and an aqueous suspension being able to be passed through the turbulence channels and through the nozzle to form a suspension jet.
  • an aqueous suspension with a total density of more than 1.5%, a fiber density of less than 1.2% and an ash mass fraction of greater than 30% can be passed through the headbox, and that at least 3 rows one above the other are arranged and that the turbulence channels have a maximum hydraulic diameter of less than 25 mm, in particular less than 20 mm and that the nozzle has a length of more than 500 mm, in particular more than 700 mm and in the nozzle between the adjacent lines of the turbulence generator, fins are used which, starting at the turbulence generator, extend over at least part of the length of the nozzle.
  • lamella holders for fastening the lamellae are arranged between the rows of turbulence channels.
  • the headbox can be followed by a forming area, a press area, a drying area, a winding area and an impregnation device and / or a laminating device.
  • the turbulence channels viewed in the flow direction, comprise a first section and a second section and an end section with an outlet cross section. These sections have a hydraulic diameter which is calculated from the four-fold cross-sectional area divided by the circumference of the respective section of the turbulence channel. The ratio between the hydraulic diameter of the second section and the hydraulic diameter of the first section is greater than or equal to 1.25.
  • This cross-sectional expansion which can be carried out as a step change, generates sufficiently high shear forces and turbulence for sufficient mixing of the components of the suspension.
  • the sum of the lengths of the second section and the end section is 4 to 10 times the root of the exit area, the exit area being given in the unit mm 2 and the length in the unit mm.
  • the second section can, for example, pass into the end section via a non-detachable diffuser. This helps to avoid or reduce hydraulic instabilities in the suspension jet and thus to improve the flatness of the highly filled paper, in particular the decorative paper, and to reduce faults and defects in the lamination process.
  • the second section contains the end section.
  • the second section also forms the outlet cross section with an outlet cross-sectional area.
  • the turbulence channel therefore has only two sections. The The length of the second section is thus 4 to 10 times the root of the area of the outlet cross section, the area being given in the unit mm 2 and the length in the unit mm.
  • the length of the slats is the same or different.
  • the length of the fins is between 0.3 and 1.2 times, in particular between 0.5 and 0.8 times the length of the nozzle.
  • the nozzle has an inlet cross-section assigned to a line and the ratio between the area of the inlet cross-section and the sum of the outlet cross-sections of the turbulence channels of a line is less than 1.75, the inlet cross-section of the nozzle being the cross-section through which flow can pass. This avoids gross hydraulic instabilities in the suspension jet.
  • the outlet cross section is advantageously less than 600 mm 2 , preferably less than 350 mm 2 .
  • the outlet cross section of the individual turbulence channels can be rectangular, square or hexagonal.
  • the suspension is passed through the nozzle with a gap width of the outlet gap in the range from 7 to 14 mm, in particular from 8 to 11 mm.
  • FIG. 1 shows in a section along the flow direction D a turbulence generator 2 and a nozzle 3 with fins 4.
  • the turbulence generator 2 comprises a plurality of turbulence channels 7.1n, 7.2n, 7.3n, 7.4n. Part of the plurality of turbulence channels 7.1n, 7.2n, 7.3n, 7.4n are arranged next to one another across the width of the headbox (1) and each form a line 7.1, 7.2, 7.3, 7.4 of turbulence channels.
  • the headbox in this example comprises four lines 7.1, 7.2, 7.3, 7.4 lying one above the other.
  • Each turbulence channel 7.1n, 7.2n, 7.3n, 7.4n has a first section 8, into which the suspension is fed, a second section 9 and an end section 10.
  • the hydraulic diameters of the individual sections become larger in the flow direction D.
  • the first section 8 consists of a tubular cross section, which in a step-like extension merges into the second section 9, which is also formed from a tubular cross section.
  • the ratio between the hydraulic diameter of the second section 9 and the hydraulic diameter of the first section 8 is greater than or equal to 1.25. This sudden expansion ensures that the solids contained in the aqueous suspension are thoroughly mixed.
  • the end section 10 following the second section forms a transition from the round cross section of the second section 9 to a square cross section of the outlet cross section 10.1n, 10.2n, 10.3n, 10.4n of the turbulence channel 7.1n, 7.2n, 7.3n, 7.4n. into the nozzle 3.
  • the second section 9 it is also possible for the second section 9 to include the end section 10.
  • the cross section of the second section 9 also forms the outlet cross section 10.1n, 10.2n, 10.3n, 10.4n with an outlet cross-sectional area of the turbulence channel 7.1n, 7.2n, 7.3n, 7.4n.
  • the step change between the first and the second section 9 then takes place from a round to a square cross section.
  • the sum of the lengths 9L of the second section 9 and of the end section 10 is 4 to 10 times the value from the root of the exit area of the exit cross section 10.1n, 10.2n, 10.3n, 10.4n, the exit area being in the unit mm 2 and Length is given in mm.
  • the second section 9 merges into the end section 10 via a non-detachable diffuser.
  • the exit surface of the exit cross section 10.1n, 10.2n, 10.3n, 10.4n is less than 600 mm 2 , preferably less than 350 mm 2 .
  • the outlet cross-section of the individual turbulence channels 7.1n, 7.2n, 7.3n, 7.4n is square in this example.
  • Slat holders 14 for fastening the slats 4 are arranged between all adjacent rows 7.1, 7.2, 7.3, 7.4.
  • the lamellae 4 are thinner than the lamella holder 14 and extend until shortly before the end of the nozzle in the area of the outlet gap with the gap width 15.
  • the lamella length 5 is 0.8 times the nozzle length 6 and the gap width lies in Range from 7 mm to 14 mm.
  • All slats 4 have essentially the same length 5.
  • the turbulence channels 7.1n, 7.2n, 7.3n, 7.4n are arranged in relation to the nozzle 3 such that an essentially rectilinear flow pattern is created. The suspension flow is therefore not significantly deflected by this arrangement. The formation of disruptive instabilities by deflections is thus avoided.
  • the Figure 2 shows a detail in the view against the flow direction D of the headbox 1 according to the invention Figure 1 in a schematic and highly simplified representation.
  • the number of one of the turbulence channels transverse to the flow direction D in a line is designated by "n", where "n” can take values from 1 to the number of turbulence channels in a line.
  • the four lines 7.1, 7.2, 7.3, 7.4 are separated by lamella holders 14.
  • the slats 4 are indicated by dashed lines.
  • the outlet cross sections 10.1n, 10.2n, 10.3n, 10.4n has a square shape.
  • the hydraulic diameter 12 of the end section 10 corresponds to the edge length of the respective turbulence channel 7.1n, 7.2n, 7.3n, 7.4n.
  • the sum of the areas of the outlet cross sections 10.1n, 10.2n, 10.3n, 10.4n of the turbulence channels 7.1n, 7.2n, 7.3n, 7.4n is smaller by the land area 13 than that of the respective line 7.1 , 7.2, 7.3, 7.4 assigned area of the inlet cross-section of the nozzle 3.
  • the inlet cross-section of the nozzle 3 is thus the cross-section through which flow can pass.
  • This cross-sectional expansion must be as small as possible in order to limit hydraulic instabilities in the suspension jet.
  • the ratio between the area of the inlet cross section of the nozzle 3 assigned to a line and the sum of the areas of the outlet cross sections 10.1n, 10.2n, 10.3n, 10.4n of the turbulence channels 7.1n, 7.2n, 7.3n, 7.4n of this line is less than 1 , 75th This avoids gross hydraulic instabilities in the suspension jet.
  • the area of the inlet cross section results from the height 11 of the inlet cross section multiplied by the flow-through width of the nozzle.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
EP16721778.5A 2015-05-22 2016-05-04 Verfahren und vorrichtung zur herstellung von hochgefüllten papieren Active EP3298193B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015209389.1A DE102015209389A1 (de) 2015-05-22 2015-05-22 Verfahren und Vorrichtung zur Herstellung von hochgefüllten Papieren
PCT/EP2016/059966 WO2016188715A1 (de) 2015-05-22 2016-05-04 Verfahren und vorrichtung zur herstellung von hochgefüllten papieren

Publications (2)

Publication Number Publication Date
EP3298193A1 EP3298193A1 (de) 2018-03-28
EP3298193B1 true EP3298193B1 (de) 2020-02-05

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EP16721778.5A Active EP3298193B1 (de) 2015-05-22 2016-05-04 Verfahren und vorrichtung zur herstellung von hochgefüllten papieren

Country Status (4)

Country Link
EP (1) EP3298193B1 (zh)
CN (1) CN107667195B (zh)
DE (1) DE102015209389A1 (zh)
WO (1) WO2016188715A1 (zh)

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19728599A1 (de) * 1997-07-04 1999-01-07 Voith Sulzer Papiermasch Gmbh Stoffauflauf
DE19926803A1 (de) * 1999-06-12 2000-12-14 Voith Sulzer Papiertech Patent Stoffauflauf
DE10335752A1 (de) * 2003-08-05 2005-03-03 Voith Paper Patent Gmbh Stoffauflauf einer Papier- oder Kartonmaschine
DE102004051255A1 (de) * 2004-10-21 2006-04-27 Voith Paper Patent Gmbh Blattbildungssystem
WO2007006369A1 (de) * 2005-07-14 2007-01-18 Voith Patent Gmbh Verfahren und vorrichtung zum beladen von in einer faserstoffsuspension enthaltenen fasern mit füllstoff
DE102006003647A1 (de) * 2005-07-14 2007-01-18 Voith Patent Gmbh Verfahren und Vorrichtung zum Beladen von in einer Faserstoffsuspension enthaltenen Fasern mit Füllstoff
DE102006000069A1 (de) * 2006-02-15 2007-08-16 Voith Patent Gmbh Stoffauflauf
DE102009028385A1 (de) * 2009-08-10 2011-02-17 Voith Patent Gmbh Verfahren zum Betreiben einer Blattbildungseinheit und Blattbildungseinheit
DE102009028389A1 (de) * 2009-08-10 2011-02-17 Voith Patent Gmbh Stoffauflauf, Blattbildungseinheit mit einem Stoffauflauf und Verfahren zum Betreiben einer Blattbildungseinheit
DE102010001613A1 (de) * 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Stoffauflauf und Blattbildungseinheit mit einem Stoffauflauf
DE102010001614A1 (de) * 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Stoffauflauf und Blattbildungseinheit mit einem Stoffauflauf
DE102010001610A1 (de) * 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Stoffauflauf und Blattbildungseinheit mit einem Stoffauflauf
DE102010001615A1 (de) * 2010-02-05 2011-08-11 Voith Patent GmbH, 89522 Stoffauflauf und Blattbildungseinheit mit einem Stoffauflauf
DE102011083085A1 (de) * 2011-09-21 2013-03-21 Voith Patent Gmbh Stoffauflauf für eine Maschine zur Herstellung einer Faserstoffbahn
EP2784212A1 (en) * 2013-03-28 2014-10-01 Valmet Technologies, Inc. Paper or board making machine and method for manufacturing high filler content paper or board

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
EP3298193A1 (de) 2018-03-28
CN107667195A (zh) 2018-02-06
CN107667195B (zh) 2020-06-26
WO2016188715A1 (de) 2016-12-01
DE102015209389A1 (de) 2016-11-24

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