US3725197A - Headbox for a papermaking machine containing multiple parallel ducts - Google Patents

Headbox for a papermaking machine containing multiple parallel ducts Download PDF

Info

Publication number
US3725197A
US3725197A US00062840A US3725197DA US3725197A US 3725197 A US3725197 A US 3725197A US 00062840 A US00062840 A US 00062840A US 3725197D A US3725197D A US 3725197DA US 3725197 A US3725197 A US 3725197A
Authority
US
United States
Prior art keywords
ducts
headbox
perforated plate
diameter
cross
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
US00062840A
Other languages
English (en)
Inventor
H Dahl
A Kurz
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.)
Sulzer Escher Wyss GmbH
Original Assignee
Escher Wyss 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 Escher Wyss GmbH filed Critical Escher Wyss GmbH
Application granted granted Critical
Publication of US3725197A publication Critical patent/US3725197A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • 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

Definitions

  • a headbox for a papermaking machine which includes a plate which extends over the width thereof and contains a plurality of parallel ducts, each of which widen in stepwise fashion with the opening angle between each successively larger duct portion being between 100 and 180.
  • the stock suspension feeds to the headbox plate directly from the supply conduit and is discharged from the parallel ducts to the headbox outlet by an unobstructed flow path.
  • the invention relates to a headbox for papermaking and the like machines, wherein the suspension of fibres is lead through a perforated plate which extends over the entire width of the web to be formed and has a plurality of ducts which are parallel to one another.
  • a further headbox with a tube group comprising very long tubes is shown in the German patent application as laid open for public inspection 1,461,071. It is true that the long tube group opens directly into the outlet, but it must be preceded by a device for bringing about uniform pressure conditions.
  • the headboxes using tube groups which have been described require a considerable overall length and a com- Patented Apr. 3, 1973 plicated distributing or pressure compensating arrangement.
  • the headboxes with perforated plates which have been described are complicated owing to the elements connected with the said plate, and also require a fairly considerable overall length.
  • the invention has as its object to permit a simpler and more compact headbox which is relatively inexpensive to produce.
  • this problem is solved according to the invention in that the ducts of the plate are widened stepwise after an initial portion in the throughcflow direction of the suspension of fibres, whereby the transition between two successive portions of said ducts has an opening angle of at least
  • the opening angle preferably may be and advantageously there will be at least two stage portions following said initial portion.
  • the fibre suspension is fed to the perforated plate through a supply conduit extending transversely to the throughfiow direction thereof, as is known from the two last-mentioned publications.
  • the inlet cross-section of the supply conduit is so dimensioned that the flow speed in this inlet cross-section amounts to 45 85% of the flow speed in the initial portion of the ducts of the perforated plate.
  • the diameter of the ducts in the plate at the inlet side thereof amounts to at least 8 mm. and at the outlet side thereof at the most 40 mm.
  • the diameter of the ducts at their inlet side is to amount to 8 to 20 mm., the sum of the cross-sectional areas of the ducts amounting to 5 to 20% of the total cross-sectional area of the perforated plate. Furthermore the length of the initial portion is to amount to 5 to 10 times the diameter of the ducts at their inlet side. Finally, the diameter of the ducts at their outlet side is to amount to 25 to 40* mm., the sum of the crosssectional areas of the ducts amounting to 40 to 85% of the total cross-sectional area of the perforated plate.
  • This kind of perforated plate can be produced in a particularly simple manner by arranging the ducts in individual rows and making one or more stage portions of a duct and the corresponding stage portions of the ducts adjoining it in the same row merge into one another in the direction of the row, the walls of the stage portions which merge into one another extending at least substantially in the direction of the row.
  • stage portions of the ducts of a row which follow the initial portion merge into one another in the direction of the row, and the walls of the stage portions extend exactly in the direction of the row. In this way it is possible to avoid drilling the stage portions.
  • the stage portions can be formed by joining strips side by side which extend over the entire length of a row.
  • the headbox according to the invention has important advantages relatively to the known headboxes. Owing to the preferred acceleration of the flow at the inlet region of the ducts in the perforated plate a considerable throttling effect occurs and this ensures good distribution of the fibre suspension over all ducts.
  • the transverse arrangement of the supply conduit has the effect that the flow in the supply conduit passes along the inlet side of the plate and keeps this clean. Preforated cylinders arranged at the inlet side, or other turbulent-producing means with their negative consequences for flow stability, are no longer necessary.
  • the slowing-down of the flow in the plate which follows the aforesaid acceleration can take place without unstable flow detachment phenomena and detrimental precipitation over a short distance.
  • the flow speed at the end of the ducts can be only slightly above the speed in the part of the stuff box following the perforated plate, and perforated discs downstream of the perforated plate, on which accretions can form, can be dispensed with.
  • FIG. 1 shows a fragmentary horizontal sectional view of a perforated plate, taken in the direction of the ducts,
  • FIG. 2 shows a view of the perforated plate in the direction of the arrow Z in FIG. 1,
  • FIG. 3 shows a horizontal sectional view through a perforated plate and a supply conduit associated therewith for the fibre suspension
  • FIG. 4 shows a sectional view taken on the line IV-IV of FIG. 3,
  • FIG. 5 shows a view in section corresponding to FIG. 4 through another form of embodiment
  • FIG. 6 shows a view in section corresponding to FIG. 4 through a further form of embodiment
  • FIG. 7 shows a section in fragmentary manner through a perforated plate, taken in the direction of the ducts
  • FIG. 8 shows a view of the perforated plate in the direction of the arrow Y in FIG. 7,
  • FIG. 9 shows a horizontal section through a perforated plate and a supply conduit associated therewith for the fibre suspension
  • FIG. 10 shows a sectional view taken on the line X-X of FIG. 9'.
  • FIG. 11 shows a view in section corresponding to FIG. 7 through a further form of embodiment.
  • a perforated plate 1 which is shown in FIGS. 1 and 2 and is intended for a headbox for papermaking or the like machine-the drawings show only a fragmentary part of the said plateextends over the entire width of the web to be formed and comprises a plurality of ducts 2 for the fibre suspension, which are parallel to one another. As four arrows show in each case, the fibre suspension enters the duct 2 of the plate 1 at the inlet side 3 which is at the left in the drawing, and issues from the ducts at their outlet side 4.
  • the ducts 2 of the plate 1 are widened stepwise after an initial portion 5in the direction of throughflow of the fibre suspension.
  • the three stage portions formed by the steps 6a, 7a and 8a following the initial portion 5 are designated as 6, 7 and 8.
  • the diameter of the ducts 2 at their inlet side 3 i.e. the diameter of the initial portion 5 amounts to 8 to 20 mm. and preferably 10 to 15 mm., the sum of the cross-sectional areas of the ducts 2 then amounting to 5 to preferably 8 to 15% of the total cross-sectional area of the perforated plate 1.
  • the length of the initial portion 5 amounts to 5 to 10 times, preferably 6 to 8 times the diameter of the ducts 2 at their inlet side 3 i.e. the diameter of the initial portion 5.
  • the diameter of the ducts 2 at their outlet side 4 i.e. the diameter of 4 the stage portion 8 amounts to 25 to 40 mm., the sum of the cross-sectional areas of the ducts 2 then amounting to 40 to preferably 50 to 75% of the total cross-sectional area of the perforated plate 1.
  • the diameters of the stage portions 6, 7 and 8 of the ducts 2 amount to 1.2 to 1.5 times the diameter of the immediately preceding portion 5, 6, 7 respectively.
  • the length of the individual stage portions 6, 7, 8 amounts to 30 to 60 mm. preferably 40 to 50 mm.
  • each of the ducts 2 is rounded with a radius which amounts to 25 to 35% of the diameter of the ducts at their inlet side i.e. the diameter of the initial portion 5. Instead, the inlet edge of the ducts 2 can be bevelled with a bevelling which amounts to 15 to 25% of the diameter of the initial portion 5.
  • the outlet edge of the ducts 2 is r-ounded with a nadius of 2 to 3 mm.
  • the ducts are advantageously given a circular crosssection as in the example of embodiment. If they are given a different cross-sectional form, for example a hexagonal cross-section, the valid diameter is the hydraulic diameter of the cross-section.
  • the transition or step 6a, 7a or 8a between two successive portions of a duct is given a frusto-conical shape, widening in the direction of thr-oughflow of the fibre suspension, with an opening angle a of to
  • the transition may be formed of a surface extending at right angles to the duct axis, in which case the corner in the niche formed by the step is advantageously rounded.
  • the initial portion 5 and the following stage portions 6, 7, 8 are of cylindrical shape. However, these portions of the ducts may be constructed so that they widen in the direction of throughflow of the fibre suspension with an opening angle of at the most 3. However, advantageously an opening angle of only 1 to 2 will be chosen.
  • the circular-section ducts 2 are arranged as close together as possible. They all have the same spacing a, the spacing b between neighbouring rows amounting to a/2- /3.
  • This honeycomb arrangement is indicated by the grid pattern formed of equilateral trinagles drawn by means of thin lines in FIG. 2.
  • the perforated plate 1 is shown in its entire extent over the width of the web to be formed. It is arranged in a headbox 9.
  • the fibre suspension is fed to the perforated plate 1 by way of a supply conduit 10 which extends transversely to the direction of throughfiow through the said plate.
  • the inlet cross-section 11 of the supply conduit 10 is so dimensioned that the speed of flow in this inlet crosssection amounts to 45 to 85% of the speed of flow in the initial portion 5 of the ducts 2 of the perforated plate 1.
  • the cross-section of the supply conduit 10 also decreases proportionally to the width of the perforated plate 1, i.e. the width of the web to be formed.
  • the supply conduit 10 has an outlet cross-section 12 amounting to 8 to 15% of the inlet cross-section 11.
  • the perforated plate 1 can be preceded immediately by the simple supply conduit 10 feeding the fibre suspension in transversely, and can be followed immediately by the outlet 13 of the headbox 9.
  • FIG. 5 shows, instead of the outlet 13 situated at the height of the lower edge of the perforated plate 1, it is also possible to use an outlet 14 which is arranged centrally of the height of the perforated plate 1.
  • the perforated plate 1 constructed according to the invention affords important advantages.
  • the short perforated plate 1 can immediately precede the stuff box, and again a simple supply conduit 10 is sufficient for distribution of the fibre suspension.
  • the ducts 2 are arranged in individual rows 20, 21 and 22, and the stage portions 16, 1'7, 18 and 19 which follow the initial portion 5 in the ducts 2 of the rows 20, 21, 22 merge into one another in the direction of the relevant row in each case.
  • the bounding walls 16b, 17b, 13b and 19b of the stage portions 16, 17, 18, 19 which merge into one another extend in the direction of the relevant row.
  • the diameter of the ducts 2 at their inlet side 3, i.e. the diameter of the initial portion 5, amounts to 8 to 20 mm., preferably 10 to mm., the sum of the crosssectional areas of the ducts 2 then amounting to 5 to preferably 8 to 15% of the total cross-sectional area of the perforated plate 1.
  • the length of the initial portion 5 amounts to 5 to 10 times, preferably 6 to 8 times the diameter of the ducts 2 at their inlet side 3, i.e. the diameter of the initial portion 5.
  • the initial portions 5 are arranged close together.
  • the width d of the stage portion 16 directly following the initial portion 5 is equal to the spacing c of the centres of the initial portions 5.
  • the cross-sectional area of the merged stage portions 16 for the stuff throughfiow amounts to 1.3 to 2.3 times the sum of the cross-sectional areas of the initial portions 5. Furthermore the cross-sectional area of a stage portion 17 or 18 or 19 respectively amounts to 1.3 to 2.3 times the cross-sectional area of the immediately preceding stage portion 16 or 17 or 18.
  • the length of the individual stage portions 16, 17, 18, 19 amounts to to 60 mm., preferably 40 to 50 mm.
  • the inlet edge of the ducts 2 is rounded with a radius which amounts to 25 to of the diameter of the ducts at their inlet side, i.e. the diameter of the initial portion 5.
  • the inlet edge of the ducts 2 can be bevelled with a bevelling which amounts to 15 to 25% of the diameter of the initial portions 5.
  • the intermediate walls remaining between the last stage portions 19 of two neighbouring rows 20, 21 or 21, 22 are to be very thin.
  • the edges at the outlet side 4 are advantageously rounded; said intermediate walls may also be constructed to narrow continuously towards the outlet end 4.
  • transition or step 16a, 17a, 18a or 19a between two successive duct portions 5, 16 or 16, 17 or 17, 18 or 18, 19 can be efiected in the ways described with reference to FIGS. 1 and 2.
  • the portions of a duct need not have a constant cross-sectional area over their entire length, and instead the duct walls may be given an opening angle of 1 to 2 (at the most 3)-widening the throughflow cross-section.
  • FIGS. 9 and 10 show that the FIG. 7 embodiment of the plate 1 may be used in the same way as the FIG. 1 version.
  • the rows of ducts 2 in the perforated plate 1 extend over the width of the web to be formed, i.e. parallel to the drawing plane in FIG. 9.
  • the rows of ducts 2 may, alternatively, extend for example at rigth angles to the width of the web to be formed.
  • the perforated plate 1 shown 'm FIG. 11 is composed of individual parts, namely a perforated strip 23 with the holes of the initial portion 5, and strips 24, 25, 26, 27 which are glued to one another and to the perforated strip 23.
  • a headbox for papermaking and similar machines including an inlet for fiber suspension, a supply conduit leading from the inlet, and an outlet for delivering the suspension to the web to be formed by the machine, and characterized by a plate which extends over the entire width of said web and contains a plurality of parallel ducts having entrances which communicate directly with the supply conduit and each of which is divided into successive portions of larger cross section by steps which afford opening angles of at least each duct having an initial portion and at least two additional downstream portions; and by an unobstructed flow path which leads the suspension issuing from the ducts to the outlet.
  • each step affords an opening angle of 3.
  • the headbox defined in claim 1 in which the supply conduit is arranged transversely to the ducts; and the inlet is sized so that the flow velocity therein is 45% to 85% of the velocity in said initial portion of the ducts.
  • the duct entrances have a diameter of 8 to 20 mm; the sum of the cross-sectional areas of said entrances is 5 to 20% of the total cross-sectional area of said plate; the length of said initial portion is 5 to 10 times the diameter of said duct entrances; the duct exits have a diameter of 25 to 40 mm; and the sum of the cross-sectional areas of said exits is 40 to 85% of the total cross-sectional area of said plate.

Landscapes

  • Paper (AREA)
  • Making Paper Articles (AREA)
US00062840A 1969-08-14 1970-08-11 Headbox for a papermaking machine containing multiple parallel ducts Expired - Lifetime US3725197A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1941424A DE1941424C3 (de) 1969-08-14 1969-08-14 Stoffauflauf für eine Papiermaschine
DE1953086A DE1953086C3 (de) 1969-08-14 1969-10-22 Stoffauflauf für eine Papiermaschine

Publications (1)

Publication Number Publication Date
US3725197A true US3725197A (en) 1973-04-03

Family

ID=25757793

Family Applications (1)

Application Number Title Priority Date Filing Date
US00062840A Expired - Lifetime US3725197A (en) 1969-08-14 1970-08-11 Headbox for a papermaking machine containing multiple parallel ducts

Country Status (10)

Country Link
US (1) US3725197A (fr)
AT (1) AT311785B (fr)
CA (1) CA937794A (fr)
CH (1) CH518406A (fr)
DE (2) DE1941424C3 (fr)
ES (1) ES382759A1 (fr)
FI (1) FI69140C (fr)
FR (1) FR2058290B1 (fr)
GB (1) GB1322591A (fr)
SE (1) SE370737B (fr)

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3865687A (en) * 1972-08-15 1975-02-11 Valmet Oy Viscosity perturbation damper connected with distribution header of papermaking machine headbox
US4137124A (en) * 1976-05-11 1979-01-30 Escher Wyss Gmbh Head box for a papermaking machine
US4146427A (en) * 1976-02-25 1979-03-27 Escher Wyss Gmbh Head box guide block having bores and tubular inserts
US4146052A (en) * 1976-07-20 1979-03-27 Escher Wyss Gmbh Damping device for a flow of liquid
DE2800547A1 (de) * 1977-12-13 1979-06-21 Escher Wyss Gmbh Stoffauflaufvorrichtung einer papiermaschine
US4192710A (en) * 1977-10-20 1980-03-11 Escher Wyss Gmbh Method and apparatus for measuring the throughflow quantity of a liquid substance per unit of time in a papermaking machine
US4225386A (en) * 1978-03-23 1980-09-30 Aktiebolaget Karlstads Mekaniska Werkstad Headbox for a paper machine
DE3237636A1 (de) * 1981-06-23 1983-05-11 Valmet Oy, 00130 Helsinki Stoffauflauf einer papiermaschine
US4455197A (en) * 1980-04-02 1984-06-19 Dominion Engineering Works Limited Stock supply system for paper machine
US4464225A (en) * 1979-10-08 1984-08-07 Bell Maschinenfabrik Ag Method and machine for fabricating building boards
US4534399A (en) * 1984-06-27 1985-08-13 Crown Zellerbach Corporation Paper stock diffuser system
DE3514554A1 (de) * 1984-09-19 1986-03-27 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Stoffauflauf-vorrichtung fuer eine papiermaschine und verfahren zu deren betrieb
DE3704462A1 (de) * 1987-02-02 1988-08-11 Escher Wyss Gmbh Stoffauflauf fuer eine papiermaschine
DE3723922A1 (de) * 1987-07-18 1989-01-26 Bruderhaus Maschf Neue Turbulenzerzeuger fuer den stoffauflauf einer papiermaschine
US4895624A (en) * 1986-05-12 1990-01-23 Valmet-Ahlstrom Oy Turbulence generator made of plastic with ceramic coated flow ducts in the head box of a paper machine
US4906336A (en) * 1985-07-12 1990-03-06 Sulzer-Escher Wyss Gmbh Headbox device for a papermaking machine
US4909904A (en) * 1987-12-09 1990-03-20 J.M. Voith Gmbh Headbox for a paper machine with dilution feed lines before a turbulence generator
US5019215A (en) * 1988-10-17 1991-05-28 Groupe Laperrier & Verreault, Inc. Headbox with conduits having multiply connected domains
US5124002A (en) * 1990-06-15 1992-06-23 J. M. Voith Gmbh Headbox with turbulence generator pipe layers of different cross sections
US5147509A (en) * 1990-06-25 1992-09-15 Beloit Corporation Headbox for a papermaking machine with distribution tubes
US5183537A (en) * 1991-10-07 1993-02-02 Beloit Technologies, Inc. Headbox tube bank apparatus and method of directing flow therethrough
US5741401A (en) * 1994-09-20 1998-04-21 Voith Sulzer Papiermaschinen Gmbh Headbox of a paper machine
US6264796B1 (en) 1999-07-13 2001-07-24 The Mead Corporation Headbox diffuser
US6679974B1 (en) * 1999-10-04 2004-01-20 Metso Paper, Inc. Procedure and means for generating turbulence in stock suspension flow
US20060086179A1 (en) * 2004-10-27 2006-04-27 Fm Global Technologies, Llc Temperature and moisture probe
US8303774B2 (en) 2008-12-18 2012-11-06 Voith Patent Gmbh Headbox for a machine for producing a fibrous web
DE10208610B4 (de) * 2002-02-27 2014-03-06 Voith Patent Gmbh Verfahren zum Verteilen einer Faserstoffsuspension im Stoffauflauf einer Papier- oder Kartonmaschine und Stoffauflauf

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH598407A5 (fr) * 1975-09-30 1978-04-28 Escher Wyss Gmbh
EP0071118B1 (fr) * 1981-07-31 1986-03-12 Mitsubishi Jukogyo Kabushiki Kaisha Dispositif de répartition d'écoulement
JPS602792A (ja) * 1983-06-20 1985-01-09 三菱重工業株式会社 抄紙機のヘツドボツクス
DE19728599A1 (de) * 1997-07-04 1999-01-07 Voith Sulzer Papiermasch Gmbh Stoffauflauf
DE202009010398U1 (de) 2009-07-31 2009-11-05 Voith Patent Gmbh Zudosiereinrichtung und Stoffauflauf mit einer Zudosiereinrichtung

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3272233A (en) * 1963-03-08 1966-09-13 Diamond Int Corp Taper flow inlet

Cited By (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3865687A (en) * 1972-08-15 1975-02-11 Valmet Oy Viscosity perturbation damper connected with distribution header of papermaking machine headbox
US4146427A (en) * 1976-02-25 1979-03-27 Escher Wyss Gmbh Head box guide block having bores and tubular inserts
US4137124A (en) * 1976-05-11 1979-01-30 Escher Wyss Gmbh Head box for a papermaking machine
US4146052A (en) * 1976-07-20 1979-03-27 Escher Wyss Gmbh Damping device for a flow of liquid
US4192710A (en) * 1977-10-20 1980-03-11 Escher Wyss Gmbh Method and apparatus for measuring the throughflow quantity of a liquid substance per unit of time in a papermaking machine
US4221635A (en) * 1977-12-13 1980-09-09 Escher Wyss Gmbh Pulp feed for a papermaking machine
DE2800547A1 (de) * 1977-12-13 1979-06-21 Escher Wyss Gmbh Stoffauflaufvorrichtung einer papiermaschine
US4225386A (en) * 1978-03-23 1980-09-30 Aktiebolaget Karlstads Mekaniska Werkstad Headbox for a paper machine
US4464225A (en) * 1979-10-08 1984-08-07 Bell Maschinenfabrik Ag Method and machine for fabricating building boards
US4455197A (en) * 1980-04-02 1984-06-19 Dominion Engineering Works Limited Stock supply system for paper machine
DE3237636A1 (de) * 1981-06-23 1983-05-11 Valmet Oy, 00130 Helsinki Stoffauflauf einer papiermaschine
US4534399A (en) * 1984-06-27 1985-08-13 Crown Zellerbach Corporation Paper stock diffuser system
DE3514554A1 (de) * 1984-09-19 1986-03-27 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Stoffauflauf-vorrichtung fuer eine papiermaschine und verfahren zu deren betrieb
DE3514554C3 (de) * 1984-09-19 1998-01-08 Escher Wyss Gmbh Stoffauflauf-Vorrichtung für eine Papiermaschine und Verfahren zu deren Betrieb
DE3514554C2 (de) * 1984-09-19 1994-06-16 Escher Wyss Gmbh Stoffauflauf-Vorrichtung für eine Papiermaschine und Verfahren zu deren Betrieb
US4906336A (en) * 1985-07-12 1990-03-06 Sulzer-Escher Wyss Gmbh Headbox device for a papermaking machine
US4895624A (en) * 1986-05-12 1990-01-23 Valmet-Ahlstrom Oy Turbulence generator made of plastic with ceramic coated flow ducts in the head box of a paper machine
DE3704462A1 (de) * 1987-02-02 1988-08-11 Escher Wyss Gmbh Stoffauflauf fuer eine papiermaschine
DE3723922A1 (de) * 1987-07-18 1989-01-26 Bruderhaus Maschf Neue Turbulenzerzeuger fuer den stoffauflauf einer papiermaschine
US4909904A (en) * 1987-12-09 1990-03-20 J.M. Voith Gmbh Headbox for a paper machine with dilution feed lines before a turbulence generator
US5019215A (en) * 1988-10-17 1991-05-28 Groupe Laperrier & Verreault, Inc. Headbox with conduits having multiply connected domains
US5124002A (en) * 1990-06-15 1992-06-23 J. M. Voith Gmbh Headbox with turbulence generator pipe layers of different cross sections
US5147509A (en) * 1990-06-25 1992-09-15 Beloit Corporation Headbox for a papermaking machine with distribution tubes
US5183537A (en) * 1991-10-07 1993-02-02 Beloit Technologies, Inc. Headbox tube bank apparatus and method of directing flow therethrough
US5741401A (en) * 1994-09-20 1998-04-21 Voith Sulzer Papiermaschinen Gmbh Headbox of a paper machine
US6264796B1 (en) 1999-07-13 2001-07-24 The Mead Corporation Headbox diffuser
US6679974B1 (en) * 1999-10-04 2004-01-20 Metso Paper, Inc. Procedure and means for generating turbulence in stock suspension flow
DE10208610B4 (de) * 2002-02-27 2014-03-06 Voith Patent Gmbh Verfahren zum Verteilen einer Faserstoffsuspension im Stoffauflauf einer Papier- oder Kartonmaschine und Stoffauflauf
US20060086179A1 (en) * 2004-10-27 2006-04-27 Fm Global Technologies, Llc Temperature and moisture probe
WO2006049726A2 (fr) * 2004-10-27 2006-05-11 Fm Global Technologies, Llc Sonde de temperature et d'humidite
WO2006049726A3 (fr) * 2004-10-27 2007-03-01 Fm Global Technologies Llc Sonde de temperature et d'humidite
US7363813B2 (en) * 2004-10-27 2008-04-29 Fm Global Technologies, Llc Temperature and moisture probe
US8303774B2 (en) 2008-12-18 2012-11-06 Voith Patent Gmbh Headbox for a machine for producing a fibrous web

Also Published As

Publication number Publication date
FR2058290B1 (fr) 1973-01-12
GB1322591A (en) 1973-07-04
DE1953086A1 (de) 1971-04-29
SE370737B (fr) 1974-10-28
AT311785B (de) 1973-12-10
DE1953086B2 (de) 1981-06-25
DE1941424C3 (de) 1980-07-10
FI69140C (fi) 1985-12-10
DE1941424A1 (de) 1971-02-25
CA937794A (en) 1973-12-04
FR2058290A1 (fr) 1971-05-28
CH518406A (de) 1972-01-31
FI69140B (fi) 1985-08-30
DE1941424B2 (de) 1976-11-25
DE1953086C3 (de) 1982-03-04
ES382759A1 (es) 1973-04-16

Similar Documents

Publication Publication Date Title
US3725197A (en) Headbox for a papermaking machine containing multiple parallel ducts
FI51229C (fi) Anordning foer tillfoersel av maeld i en pappersmaskin
KR840001811B1 (ko) 제지기의 헤드 박스
US3296066A (en) Headbox for papermaking machine and stock distributor thereto
US3744724A (en) Air distributing channel
GB1119561A (en) Improvements in or relating to apparatus for delivering a dilute fibre suspension to the forming member of a non-woven fibrous web-forming device
US4198270A (en) Head box for a paper making machine
US3878039A (en) Paper machine headbox having convergent throat portion
US4897160A (en) Head box for a paper making machine
US3328237A (en) Headbox for paper machine
US3652392A (en) Contracting pre-slice flow distributor for papermaking machine headbox
JPH04241186A (ja) 製紙機械用ヘッドボックス
US3535203A (en) Hole plate for one-sided inlet headboxes for paper machines
US3661702A (en) Stock flow system for paper-making machine
US3486972A (en) Fiber suspension distributor for the inlet of paper-making machines
US2869436A (en) Stock cross-flow distribution
JP2666196B2 (ja) 抄紙機用のフローボツクス
US3652391A (en) Box-like blending chamber with barrier elements to produce uniform flow of papermaking stock
US3622450A (en) Papermaking flow box
US3067815A (en) Suspension distributing system
JPH0242928B2 (fr)
US3345254A (en) Multiple manifold headbox
US3591452A (en) Apparatus for feeding paper stock to a paper machine
US3575800A (en) Multiple gallonage header for paper machine headbox
US4445975A (en) Headbox for a papermaking machine