EP0722521B1 - Dispositif pour la formation d'un jet plan de liquide - Google Patents

Dispositif pour la formation d'un jet plan de liquide Download PDF

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Publication number
EP0722521B1
EP0722521B1 EP95926998A EP95926998A EP0722521B1 EP 0722521 B1 EP0722521 B1 EP 0722521B1 EP 95926998 A EP95926998 A EP 95926998A EP 95926998 A EP95926998 A EP 95926998A EP 0722521 B1 EP0722521 B1 EP 0722521B1
Authority
EP
European Patent Office
Prior art keywords
liquid
vortices
curved
flow
turbulence
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.)
Expired - Lifetime
Application number
EP95926998A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0722521A1 (fr
Inventor
Salah Skali Lami
Gérard COGNET
Jean-Marie Pierrard
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.)
Valmet Technologies Oy
CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSE
Original Assignee
Valmet Oy
CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSE
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 Valmet Oy, CENTRE TECHNIQUE DE L'INDUSTRIE DES PAPIERS CARTONS ET CELLULOSE filed Critical Valmet Oy
Publication of EP0722521A1 publication Critical patent/EP0722521A1/fr
Application granted granted Critical
Publication of EP0722521B1 publication Critical patent/EP0722521B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • D21F1/028—Details of the nozzle 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

Definitions

  • the invention relates to a device for forming a plane jet. a liquid; it relates more particularly to the formation of such jet plan in the field of mixing, coating, coating and manufacture of sheet or plate materials from particles in suspension in a fluid, in particular suspension of fibers in water (see US-A-2,451,305).
  • the invention is particularly suitable for the paper industry in level of leaf formation from fibrous suspensions; she also finds different applications in the field of coating and in the coating of paper and cardboard.
  • the invention is particularly described in its application to the manufacture of papers, it can also find other applications in mixtures with or without heat exchange in the chemical and agro-food industries, pharmaceuticals or water treatment, as well as in manufacturing films from polymers or molten metals, or in the fiber cement manufacturing.
  • the fibrous suspension turns into a jet of dough coming out of the headbox.
  • any local variation in sheet weight comes from either a local speed variation, either the concentration caused by the flocculation, or both at the time.
  • the speed variations in the cross direction are of origin not turbulent. They can be random if the surface finish of the output is perfect, if not stationary. We thus sought to standardize the pressure in the outlet nozzle to obtain a uniform distribution of the speed field. However, this setting is difficult to obtain on nozzle widths of the order or more than three meters.
  • Head boxes designed for high concentration training must be effective at low concentrations. Indeed, power deflocculate a concentrated system and maintain it in the free jet, must allow perfectly homogeneous flows to be achieved with commonly used concentrations.
  • the invention overcomes these drawbacks.
  • the invention relates more particularly to a headbox capable of generate vortices to ensure the dislocation of flocs in better conditions, in particular by a stretching effect rotational, known by the English term "swirling".
  • This device is particularly suitable for the treatment of fibrous suspensions in the paper industry.
  • the invention consists, in a headbox of a paper machine, to introduce the suspension fibrous in two successive curved channels with parallel axis, coaxial in particular, so as to form calibrated vortices with an axis parallel to the flow, therefore to the channels, to create a transverse distribution harmonic of velocities and pressures, and consequently form a homogeneous jet in speed and reduced flocculation, even at high concentration.
  • the first external fixed flow channel produces vortices calibrated on a large scale adapted to the dispersion of the largest flocs.
  • the second internal flow channel with an axis parallel to the first, associated with the rotating cylinder, produces small-scale calibrated vortices suitable for dispersing the smallest flocs of fibers.
  • the rotary cylinder rotates in the same direction as the flow of the suspension, and the peripheral speed of the rotary cylinder is approximately three to four times that of the flow velocity, if we wants to minimize pressure losses.
  • the rotary cylinder has a non-uniform surface condition, for example example of which the generator follows a broken or wavy line, regular preference.
  • the generator of the cylinder follows the shape of a radial sine groove with a wavelength of about two to ten times (preferably three to five times) the average length of the fibers.
  • the device comprises a single cylinder rotary, it can also have two parallel axes.
  • the device also comprises a deflector member arranged between the rotary cylinder and the outlet jet to separate the flow between the supply and the outlet in the channel curved.
  • the device has means for introducing water, solutions or suspensions, arranged along a generator of at least one of the curved channels, so as to regulate the concentration and composition of the dough at the level of the jet.
  • a composition is introduced into this means different (retention agents, fine elements, etc.) from the suspension main, so as to create an effective mixture of the different suspensions in the jet.
  • At least two head boxes according to the invention possibly with a or several conventional head boxes (multijet paper and cardboard).
  • the new headbox according to the invention aims to generate a particular turbulence where the size of the vortices is calibrated.
  • the size of these vortexes varies discreetly or continuously throughout the flow. So, at the cash register entrance, we start by generating large Dean vortex in the first curved channel, so to dislocate large flocs into smaller flocs. In the second channel curved coaxial to the first, we again reduce these flocs by vortices of Taylor modified more and more small, until total dislocation.
  • the lifetime in the free jet of the generated vortices is much larger than that of a conventional turbulence, exploited until then.
  • This parameter is important in free jet, because relaxation is at say the reappearance of the flocs, strongly depends on it since the turbulence production no longer exists.
  • Figure 1 is a representation of a device according to the invention in its application to head boxes for the manufacture of paper.
  • Figure 2 is an alternative embodiment of Figure 1 with recyclag or dilution.
  • Figure 3 is another embodiment of the invention, in which three devices are associated.
  • Figure 4 is a schematic representation of the invention in application of paper coating.
  • the headbox according to the invention designated by the reference general (1) comprises an enclosure (2) connected from below to a feeding (3) in fibrous suspension, commonly used in manufacture of paper or cardboard.
  • the enclosure (2) of parallelepiped shape, for example of section square, has an outlet orifice (4) from which the plane jet comes (J).
  • the orifice outlet (4) is advantageously formed in a known manner by a lip fixed lower (5), and an upper lip (6), adjustable relative to the lower lip (5), to adjust the size of the outlet.
  • the conduit supply (3) opens into a first space (10) formed between the rectilinear vertical wall (11) and a curved portion (12) so that that the thickness of the vein of the liquid fluid (F) decreases gradually.
  • the liquid flow (F) enters a first fixed curved flow channel, designated by the general reference (15), formed by two curved coxial plates, respectively exterior (16) and interior (17) in the extension of (12).
  • a first fixed curved flow channel designated by the general reference (15)
  • the curved area (16) does everything around the enclosure (2) and at the level of the wall (18) parallel to (11) is welded at (19) at the inlet (20) of the upper lip (6).
  • the device also includes a second channel, designated by the general reference (25) formed by the internal face of the curved plate (17), so that that the fibrous suspension (F2) be subjected to Taylor vortices modified more and more small, until total dislocation of the flocs.
  • a second channel designated by the general reference (25) formed by the internal face of the curved plate (17), so that that the fibrous suspension (F2) be subjected to Taylor vortices modified more and more small, until total dislocation of the flocs.
  • the device also includes a rotating cylinder (26) about an axis (29) parallel to the axis of the channels (15 and 25), driven by a motor (27) at by means of a belt (28).
  • the treated suspension (F3) enters the outlet channel (4) to thus form the desired jet plane (J).
  • the rotary cylinder (26) which forms the confined shear space with the curved plate (17) has a generator which is not a straight line, but varies from harmonically.
  • This generator can take various forms, such as by example of sawtooth, slots, arcs, and preferably sinusoid-shaped.
  • the wavelength of these shapes, sinusoid for example is on the order of three to five times the average length of the fibers of the suspension to be treated.
  • the channels (15 and 25) have a thickness decreasing in the direction of flow.
  • the outlet orifice (4) is associated with a parallel outlet (30) for recycling or dilution, arranged slightly downstream of (4) to allow increasing the flow in the device, and therefore the intensity of vorticity, while increasing the speed of the rotating cylinder (26), without modifying the flow of outlet (4) from the body.
  • the water injection points coincide spatially with the ripples of the generator of the rotating cylinder (26).
  • the speed of rotation of the characteristic cylinder (26) can vary from one to ten times the speed of flow (F) and this, one way or the other.
  • the device includes three jets (40-42), from three cases according to the invention (43,44,45) into which various suspensions containing fibers of different length and / or different concentration.
  • the references (46,47) denote a canvas, and the references (48,49) two rotary cylinders of a paper machine.
  • the references (60,61,62) designate the dough feeders and references 63, 64, 65) the dilution organs.
  • This arrangement which makes it possible to produce a multilayer structure composed of different types and / or kinds of fibers, is advantageous when using coarse to strong fiber suspensions concentrations in the central feeding device.
  • FIG. 4 schematically shows an embodiment in application to the coating of paper.
  • This device then constitutes a coating head which delivers a jet dosing plan of coating sauce (55) on a cylinder (56) having the role, either for supporting the sheet of paper (57), or transfer roller.
  • the coating sauce (E) is brought to (50) to be confined in a first curved channel (52) formed between a rotary cylinder (53) analogous to (26) and an outer sheet (54) coaxial to (53).
  • the pipeline (52) curved has a constant section, for example rectangular.
  • This pipe leads into (55) in a confined space with the coating roller (56) rotating in the direction indicated by the arrow (R).
  • the grater (51) makes it possible to control and limit the recirculation of the sauce in the channel (52).
  • the tangential speed of the cylinder (56) is of the order of three times the flow rate in the channel (52).
  • this device can be successfully used in the manufacture of papers, in head boxes, and also for paper coating.

Landscapes

  • Paper (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
  • Nozzles (AREA)
  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
EP95926998A 1994-08-10 1995-07-31 Dispositif pour la formation d'un jet plan de liquide Expired - Lifetime EP0722521B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9410055A FR2723599B1 (fr) 1994-08-10 1994-08-10 Dispositif pour la formation d'un jet plan de suspension fluide
FR9410055 1994-08-10
PCT/FR1995/001028 WO1996005369A1 (fr) 1994-08-10 1995-07-31 Dispositif pour la formation d'un jet plan de liquide

Publications (2)

Publication Number Publication Date
EP0722521A1 EP0722521A1 (fr) 1996-07-24
EP0722521B1 true EP0722521B1 (fr) 1999-01-20

Family

ID=9466335

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95926998A Expired - Lifetime EP0722521B1 (fr) 1994-08-10 1995-07-31 Dispositif pour la formation d'un jet plan de liquide

Country Status (11)

Country Link
US (1) US5816507A (zh)
EP (1) EP0722521B1 (zh)
JP (1) JPH09506398A (zh)
CN (1) CN1070963C (zh)
AT (1) ATE176019T1 (zh)
AU (1) AU3117595A (zh)
CA (1) CA2172845A1 (zh)
DE (1) DE69507447T2 (zh)
FI (1) FI961547A (zh)
FR (1) FR2723599B1 (zh)
WO (1) WO1996005369A1 (zh)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI102091B (fi) * 1997-06-30 1998-10-15 Valmet Corp Paperikoneen/kartonkikoneen perälaatikko
US7334347B2 (en) * 2001-10-30 2008-02-26 Weyerhaeuser Company Process for producing dried, singulated fibers using steam and heated air
US6769199B2 (en) 2001-10-30 2004-08-03 Weyerhaeuser Company Process for producing dried singulated cellulose pulp fibers using a jet drier and injected steam and the product resulting therefrom
US6748671B1 (en) * 2001-10-30 2004-06-15 Weyerhaeuser Company Process to produce dried singulated cellulose pulp fibers
US6782637B2 (en) 2001-10-30 2004-08-31 Weyerhaeuser Company System for making dried singulated crosslinked cellulose pulp fibers
US6862819B2 (en) 2001-10-30 2005-03-08 Weyerhaeuser Company System for producing dried singulated cellulose pulp fibers using a jet drier and injected steam
US7018508B2 (en) * 2001-10-30 2006-03-28 Weyerhaeuser Company Process for producing dried singulated crosslinked cellulose pulp fibers
FI121964B (fi) * 2008-05-09 2011-06-30 Metso Paper Inc Menetelmä ja laitteisto kuitumassan syöttämiseksi muodostusalustalle
WO2011094279A1 (en) * 2010-01-26 2011-08-04 The Board Of Governors For Higher Education, State Of Rhode Island And Providence Plantations Planar labyrinth micromixer systems and methods
CN103184703B (zh) * 2013-03-19 2015-06-03 陕西科技大学 一种流浆箱
DE112017005019T5 (de) * 2016-10-03 2019-08-01 dlhBowles Inc. Gas-zu-Gas-Sauggebläse mit verbessertem Mitreisswirkungsgrad

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2329799A (en) * 1939-01-09 1943-09-21 Thorsen Kristen Andreas Device for the distribution of stock on the wire parts of papermaking machines
US2451305A (en) * 1945-09-12 1948-10-12 William P Shannon Pressure head box for paper machines
US2756651A (en) * 1949-10-15 1956-07-31 Kimberly Clark Co Papermaking machine
DE1008564B (de) * 1955-06-03 1957-05-16 Voith Gmbh J M Verfahren und Vorrichtung zur Erzeugung des im Stoffauflauf von Langsiebpapiermaschinen erforderlichen Druckes
GB859145A (en) * 1956-05-29 1961-01-18 Kimberly Clark Co Flow control apparatus
US3228067A (en) * 1962-12-20 1966-01-11 Peter M Strang Method and apparatus for carding fiber by fluid means
SE373897B (zh) * 1974-04-02 1975-02-17 Kamyr Ab
US4376014A (en) * 1979-04-12 1983-03-08 Beloit Corporation Headbox for forming multi-ply sheets
US5100513A (en) * 1990-12-17 1992-03-31 Crawford Robert R Defloccing and distribution rolls for papermachine headbox

Also Published As

Publication number Publication date
FR2723599A1 (fr) 1996-02-16
CN1135246A (zh) 1996-11-06
WO1996005369A1 (fr) 1996-02-22
CN1070963C (zh) 2001-09-12
FI961547A (fi) 1996-05-30
EP0722521A1 (fr) 1996-07-24
FR2723599B1 (fr) 1996-08-23
CA2172845A1 (fr) 1996-02-22
US5816507A (en) 1998-10-06
JPH09506398A (ja) 1997-06-24
DE69507447D1 (de) 1999-03-04
ATE176019T1 (de) 1999-02-15
FI961547A0 (fi) 1996-04-09
DE69507447T2 (de) 1999-06-02
AU3117595A (en) 1996-03-07

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