EP0158938A2 - Dispositif pour la fabrication de nappes fibreuses - Google Patents

Dispositif pour la fabrication de nappes fibreuses Download PDF

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Publication number
EP0158938A2
EP0158938A2 EP85104134A EP85104134A EP0158938A2 EP 0158938 A2 EP0158938 A2 EP 0158938A2 EP 85104134 A EP85104134 A EP 85104134A EP 85104134 A EP85104134 A EP 85104134A EP 0158938 A2 EP0158938 A2 EP 0158938A2
Authority
EP
European Patent Office
Prior art keywords
foam
channel
slice
furnish
fiber furnish
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
EP85104134A
Other languages
German (de)
English (en)
Other versions
EP0158938A3 (en
EP0158938B1 (fr
Inventor
James Oscar Cheshire
Robert John Marinack
Johannes Archibald Van Den Akker
Douglas Leroy Lindgren
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.)
Georgia Pacific Consumer Products LP
Original Assignee
James River Norwalk Inc
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 James River Norwalk Inc filed Critical James River Norwalk Inc
Priority to AT85104134T priority Critical patent/ATE48861T1/de
Publication of EP0158938A2 publication Critical patent/EP0158938A2/fr
Publication of EP0158938A3 publication Critical patent/EP0158938A3/en
Application granted granted Critical
Publication of EP0158938B1 publication Critical patent/EP0158938B1/fr
Expired legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/022—Means for injecting material into flow within the headbox
    • 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
    • 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
    • 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
    • D21F11/002—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines by using a foamed suspension

Definitions

  • This invention relates to the manufacture of fibrous webs, and especially to improvements in a method and apparatus for laying down a fibrous web from a foam-fiber furnish.
  • the present disclosure does have in common with the disclosure of the '782 patent a non-mechanical foam generator for a foam having a volume percentage of gas in the range of from about 55 to about 75 percent to achieve uniform dispersion of fibers in a foam-fiber furnish
  • the presently claimed invention has as a general objective, as an improvement over art exemplified by the '782 and the '122 patents in particular, the provision of the novel combination of a headbox with in-line foam generating nozzles for achieving random orientation of fibers in a foam-fiber furnish as it is deposited or spread by the headbox slice, at an efflux ratio (deposition speed/wire speed) of about 1.25, onto a forming wire moving from about 1500 to about 4000 feet per minute, to form a fibrous web having an improved MD/CD tensile strength ratio.
  • the present invention takes into account teaching based on fluid dynamics theory that fluid flow will be laminar or turbulent depending upon a value of the Reynolds number as defined by the following equation:
  • a Reynolds number of 10,000 defines the point above which foam flow ceases to be laminar and becomes turbulent.
  • Foam Since the foam has about one third the density of water, while having from about 10 to about 35 times the viscosity of water, it will be appreciated from the above equation that it is much more difficult to create turbulent flow of foam. Foam, however, exhibits pseudo-plastic behavior, so that when it is subjected to shear of a sufficient rate, the apparent viscosity is reduced and its flow is most susceptible of becoming turbulent.
  • the invention contemplates an improved apparatus and method for directing a foam-fiber furnish onto a forming wire in the manufacture of a fibrous web so that the fibers are randomly oriented.
  • the invention contemplates provision of a headbox slice positioned to deposit said foam-fiber furnish onto said forming wire, wherein improvement resides in a headbox channel disposed in fluid flow communication with said slice, said channel extending generally transversely of the direction of movement of said forming wire, means defining an impact surface in said channel, and a plurality of foam-forming nozzles in fluid flow communication with said headbox channel and positioned and adapted to form and forcibly to direct foam-fiber furnish onto said surface, thereby to create turbulence immediately prior to flow of said foam-fiber furnish through said slice, ensuring random orientation of said fibers as they are deposited on said forming wire in formation of the web.
  • a web forming apparatus 10 comprising a headbox 11 provided with a channel lla leading to throat 12a of an adjustable slice 12 positioned and operative to discharge a foam-fiber furnish onto a forming wire 13 as it passes over a breast roll 14. Adjustment of the slice is afforded by a roof or upper wall 12b of throat 12a mounted for pivotal movement about hinge P, and positionable by a conventional jack means 12c. Suction boxes 15 and 16 are disposed beneath wire 13, and are connected to a vacuum source 17 for receiving both foam and liquid derived from collapsed foam, and drained through the wire.
  • Drained foam and liquid are returned by a pump 18 through conduit 19 to an in-line mixer 20 for reuse, where additional fiber, either dry or as a dispersion, and air are introduced through pipe 33 to conduit 19, by means of a known metering device such as is seen at 32, to form a dispersion of air and fiber in water containing a surfactant in creation of a foamable furnish.
  • the foamable furnish is fed under pressure by a pump 21 through an input conduit 22 to a manifold 23.
  • manifold 23 leads to parallel arrays of foamable liquid-fiber furnish inlet nozzles 24 having tubular passages such as bores 25 of alternately increased and decreased cross sectional areas.
  • the decreased cross sectional areas in combination with the increased cross sectional areas respectively effect alternate increases and decreases in the flow speed of the foamable furnish within the nozzles, thereby creating foam-forming turbulence.
  • This same bore configuration is shear inducing, thereby lowering the apparent viscosity of the foam leaving the nozzles.
  • nozzles 24 function as the sole foam forming devices in the present invention, and are disposed in direct fluid flow communication with the channel lla of headbox 11 defined by substantially planar, generally parallel, relatively closely spaced upper and lower, horizontally extending wall portions 26 and 27, respectively, side wall portions 28 and 29, and front and rear wall portions 30 and 31, respectively. Construction and arrangement of the wall portions is such that the channel lla has its major extent in a direction transverse the direction of forming wire movement.
  • the inlet connections of the one array of eleven nozzles 24 to the headbox extend through wall 26 in such a manner that foam-fiber furnish is directed from nozzles 24 at relatively low viscosity, transversely of the direction of extent of and onto a confronting, interior surface of wall portion 27 of headbox channel lla.
  • wall portion 27 serves as a turbulent flow inducing impact surface for the foam-fiber furnish. While the several walls or wall portions have been described and illustrated as being planar and parallel, it should be understood that they may be positioned out of parallel, or may be curved.
  • headbox channel lla might be defined by a generally cylindrical wall portion.
  • the inlet connections of the other array of twelve nozzles 24 to the headbox extend through wall 31 to direct foam-fiber furnish onto confronting wall 30, which also functions as an impact surface extending transversely of the direction of entry of foam-fiber furnish from the one array of eleven nozzles 24.
  • the nozzles 24 further are arranged such that the nozzle axes of the one array are between and generally in a plane perpendicular to the general plane of the nozzle axes of the other array.
  • the axes of the eleven nozzles 24 of the one array are spaced along the headbox about two inches apart, as are similarly spaced the twelve nozzles of the other array; by this spacing, the headbox extends about two feet in the cross machine direction. Additional arrays or fractions thereof may be provided in accommodation of other machine widths.
  • Each of nozzles 24 is about 3 inches in length and has a generally undulatory bore configuration defined by alternate convergent and divergent frustoconical sections. Generally, the narrower sections of lesser cross sectional area are about 1/2 inch diameter, and the wider sections of greater cross sectional area are about 3/4 inch diameter, with a distance between sections of about 1/2 inch.
  • each bore 25 and a confronting baffle or wall of channel lla The distance between the discharge end of each bore 25 and a confronting baffle or wall of channel lla is about 2 inches.
  • a mixture of air, water, about 1.0 to 4.0% by weight of papermaking wood fibers, and from about 150 PPM to about 450 PPM of a surfactant are introduced to the mixer 20 in formation of a foamable furnish suitable for the manufacture of paper webs in the range of 8 to 30 pounds per ream (3,000 sq. ft.).
  • surfactant selection e.g. anionic, nonionic, cationic, or amphoteric
  • an anionic surfactant is suitable for use with the self-bonding wood fibers of the present disclosure.
  • any of the disclosed surfactants are available on the market, one such surfactant being alpha olefin sulphonate available from Arco Chemical Company under the trademark A-OK.
  • U.S. Patent Nos. 3,716,449, 3,871,952, and 4,056,456 disclose additional surfactants suitable for use in connection with the present invention, and their teachings are included herein by reference.
  • pump 21 withdraws the foamable furnish from mixer 20 and forces it through conduit 22 into manifold 23.
  • the furnish is distributed through manifold 23 to each of nozzles 24 under a pressure of from about 25 to about 30 pounds per square inch.
  • the foamed furnish is discharged into the headbox channel lla, where it undergoes the desired fiber- deorienting turbulence, then flows through slice throat 12a, out slice 12, onto moving forming wire 13 at about 1.25 the speed of the wire.
  • Some foam is caused to collapse as it is, carried by wire 13 moving at a speed from about 1500 feet to about 3500 per minute over the suction boxes 15, 16, and the remaining foam along with liquid from the collapsed foam is drained through the wire 13 into the suction boxes under the influence of vacuum source 17.
  • a pump 18 withdraws the foam and liquid from vacuum source 17 and directs it through conduit 19 back to mixer 20 for reuse.
  • Air, as well as additional fiber, is supplied through conduit 33 from means designated generally by numeral 32.
  • the MD/CD tensile strength ratio of a foam-formed web can be reduced significantly using the present invention.
  • adjustments, up or down may be made on the MD/CD ratio by adjustments to the Efflux Ratio.
  • adjustments in the Efflux Ratio can be made to increase the MD/CD ratio, or vice versa, as seen in the following tabulation of Runs I, II, and III for Efflux Ratios of 1.25, 1.00 and 0.75:
  • the foam forming nozzles are in fluid flow communication with the headbox channel at different locations than those hereinabove described.
  • the headbox channel is generally cylindrical, affording curved walls as briefly described hereinabove, and the axes of the nozzles are located along the length of the channel as are the axes of the nozzles in Figs. 1 to 3.
  • the several walls 126 through 131 of headbox 111 similar to the one described in connection with Figs. 1 to 3, define a channel llla leading to throat 112a for feeding foam-fiber furnish through adjustable slice 112 onto forming wire 113 moving on breast roll 114.
  • Nozzles 124 are similar to the hereinabove described foam forming nozzles 24, and, while arranged in staggered array, are provided only in top wall 126, whereby foam-fiber furnish introduced into the channel impinges upon lower wall 127 as an impact surface.
  • the horizontally extending headbox channel 411a is defined by curved wall portions of a hollow cylindrical structure about 2 1/4 inches in diameter and closed at its ends by walls, one of which is seen at 428.
  • a cylindrical channel advantageously affords a compact arrangement for three arrays of foaming nozzles 424 of the type hereinabove described, and whose centerlines are spaced about 2 1/4 inches apart along the length of the channel.
  • the arrays are disposed in fluid flow communication with channel 411 in upper left and right quadrants and in the lower right quadrant of the cylindrical wall portions of the channel so that each nozzle is effective to direct foam-fiber furnish transversely of the polar axis of the cylindrical structure onto an opposed curved, cylindrical wall portion serving as an impact surface.
  • the entrance of the slice throat 412a occupies the lower left quadrant. While the nozzles are shown in the same plane for the sake of convenience, it will be understood that the nozzles of each array are staggered as respects the nozzles of the other arrays, so that the spacing between centerlines of the nozzles as between arrays is about 3/4 inch.
  • the impact surface is relatively closely spaced from the region of introduction of the foaming nozzle to the relatively low-volume headbox channel, which impact surface also is substantially perpendicular to the axis of a nozzle.

Landscapes

  • Paper (AREA)
  • Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
  • Preliminary Treatment Of Fibers (AREA)
  • Nonwoven Fabrics (AREA)
EP85104134A 1984-04-16 1985-04-04 Dispositif pour la fabrication de nappes fibreuses Expired EP0158938B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT85104134T ATE48861T1 (de) 1984-04-16 1985-04-04 Vorrichtung zur herstellung von faserbahnen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US60067984A 1984-04-16 1984-04-16
US600679 1984-04-16

Publications (3)

Publication Number Publication Date
EP0158938A2 true EP0158938A2 (fr) 1985-10-23
EP0158938A3 EP0158938A3 (en) 1986-12-30
EP0158938B1 EP0158938B1 (fr) 1989-12-20

Family

ID=24404639

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85104134A Expired EP0158938B1 (fr) 1984-04-16 1985-04-04 Dispositif pour la fabrication de nappes fibreuses

Country Status (4)

Country Link
EP (1) EP0158938B1 (fr)
JP (1) JPS60231895A (fr)
AT (1) ATE48861T1 (fr)
DE (1) DE3574887D1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000050694A1 (fr) * 1999-02-25 2000-08-31 Ahlstrom Glassfibre Oy Production de bande par traitement de moussage avec dilution de mousse
RU2304187C2 (ru) * 2001-11-09 2007-08-10 Альстром Глассфибре Ой Способ и устройство для формирования вспененного материала
WO2024002880A1 (fr) * 2022-06-27 2024-01-04 Andritz Küsters Gmbh Procédé et dispositif pour produire une bande de matière fibreuse
EP4575081A1 (fr) * 2023-12-21 2025-06-25 Andritz Küsters GmbH Procédé et dispositif de fabrication d'une bande fibreuse

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2016350780B2 (en) 2015-11-03 2020-09-10 Kimberly-Clark Worldwide, Inc. Paper tissue with high bulk and low lint
CN110494611A (zh) 2017-04-28 2019-11-22 金伯利-克拉克环球有限公司 具有卷曲短纤维的泡沫成形纤维片材
MX2020004101A (es) 2017-11-29 2020-07-24 Kimberly Clark Co Lamina fibrosa con propiedades mejoradas.
BR112021001335B1 (pt) 2018-07-25 2024-03-05 Kimberly-Clark Worldwide, Inc Método para fazer um substrato absorvente não tecido tridimensional (3d)

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3837999A (en) * 1971-12-20 1974-09-24 Kimberly Clark Co Method of controlling the orientation of fibers in a foam formed sheet
US3938782A (en) * 1972-04-07 1976-02-17 Wiggins Teape Research & Development Limited Apparatus for producing a foamed fibre dispersion
US3798122A (en) * 1972-06-26 1974-03-19 Kimberly Clark Co Method and apparatus for the production of fibrous sheets
GB1548924A (en) * 1975-05-06 1979-07-18 St Annes Board Mill Co Ltd Flowboxes
US4197159A (en) * 1977-09-02 1980-04-08 St. Anne's Board Mill Company Limited Flowboxes

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000050694A1 (fr) * 1999-02-25 2000-08-31 Ahlstrom Glassfibre Oy Production de bande par traitement de moussage avec dilution de mousse
RU2209265C2 (ru) * 1999-02-25 2003-07-27 Альстрем Глассфибре Ой Способ формования нетканного волокнистого полотна из пеноволокнистой смеси с использованием процесса разбавления пеной
RU2304187C2 (ru) * 2001-11-09 2007-08-10 Альстром Глассфибре Ой Способ и устройство для формирования вспененного материала
US7416636B2 (en) 2001-11-09 2008-08-26 Ahlstrom Glassfibre Oy Method and apparatus for foam forming
WO2024002880A1 (fr) * 2022-06-27 2024-01-04 Andritz Küsters Gmbh Procédé et dispositif pour produire une bande de matière fibreuse
EP4575081A1 (fr) * 2023-12-21 2025-06-25 Andritz Küsters GmbH Procédé et dispositif de fabrication d'une bande fibreuse

Also Published As

Publication number Publication date
DE3574887D1 (de) 1990-01-25
JPS60231895A (ja) 1985-11-18
EP0158938A3 (en) 1986-12-30
ATE48861T1 (de) 1990-01-15
EP0158938B1 (fr) 1989-12-20
JPH032995B2 (fr) 1991-01-17

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