US3853697A - Papermaking machine headbox with an upwardly inclined slice chamber portion, an arcuate portion, and a downwardly inclined portion and containing flexible trailing members - Google Patents

Papermaking machine headbox with an upwardly inclined slice chamber portion, an arcuate portion, and a downwardly inclined portion and containing flexible trailing members Download PDF

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Publication number
US3853697A
US3853697A US00339219A US33921973A US3853697A US 3853697 A US3853697 A US 3853697A US 00339219 A US00339219 A US 00339219A US 33921973 A US33921973 A US 33921973A US 3853697 A US3853697 A US 3853697A
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US
United States
Prior art keywords
headbox
slice
chamber
opening
leading
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
US00339219A
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English (en)
Inventor
J Parker
D Parker
R Hergert
R Eggen
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Beloit Corp
Original Assignee
Beloit Corp
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 Beloit Corp filed Critical Beloit Corp
Priority to US00339219A priority Critical patent/US3853697A/en
Priority to JP49025335A priority patent/JPS5233202B2/ja
Priority to GB1030874A priority patent/GB1456573A/en
Priority to IT49094/74A priority patent/IT1004354B/it
Priority to CA194,273A priority patent/CA1009486A/en
Priority to BR1771/74A priority patent/BR7401771D0/pt
Application granted granted Critical
Publication of US3853697A publication Critical patent/US3853697A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • ABSTRACT A headbox construction for delivering stock to a forming surface with the headbox having a chamber leading to a slice chamber with a slice opening and the slice chamber being located and shaped so as to have a first upwardly inclined portion supplied from the headbox chamber through a plate with openings.
  • the slice chamber further has a second arcuate portion and a third downwardly sloping tapered portion leading to the opening.
  • the arcuate portion provides a transition from the upwardly inclined to the downwardly inclined portions, and the headbox decreases in cross-section throughout its length and is provided with rigid trailing elements in the first two portions having flexible selfsupporting trailing elements in the third portion.
  • the present invention relates to improvements in paper making machines and more particularly to an improved headbox construction which utilizes the concept of having a plurality of trailing cross-machine extending elements in the slice chamber, but is constructed to eliminate the tendency toward accumula tions of air which have occurred in this type of mechanism.
  • a limitation in general headbox design has been that the means for generating turbulence in fiber suspensions in order to disperse them has achieved comparatively large scale turbulence.
  • the devices for creating such turbulence it is possible to develop small scale turbulence only by increasing the intensity of the turbulence generated.
  • the turbulence energy is transferred naturally from large to small scale and the higher the intensity, the greater the rate of energy transfer, and hence, the smaller scale of turbulence sustained.
  • Detrimental effects also result from high intensity large scale turbulence in the form of large waves and free surface disturbance developed on the fourdrinier forming surface.
  • a further object of the invention is to provide an improved headbox construction with a slice chamber shaped and constructed for improved distribution of stock to the slice opening.
  • a further object of the invention is to provide an improved headbox and slice chamber construction which has a simplicity of design allowing for low cost construction, and which attains ease of maintenance and clean-up.
  • a further object of the invention is to provide a headbox and slice chamber of compact design and small size which will obtain structural integrity and ease of shipment and removal for wire change.
  • FIG. of the drawings is a somewhat schematic side elevational view in section ofa headbox constructed and operating in accordance with the principles of the present invention.
  • the construction includes a headbox 10 which receives stock from the usual supply means including fan pumps or the like.
  • the stock enters the headbox and is directed to flow into a headbox chamber 11 and to thereafter flow into a slice chamber 12 to exit out a slice opening 13 onto a paper machine forming surface, such as a fourdrinier wire.
  • the stock enters the headbox being supplied to a tapered chamber 14 extending across the machine for uniform flow.
  • the flow then passes through a plate 15 having perforations l6 therethrough to maintain uniformity of distribution and turbulence in the stock.
  • the stock enters the headbox chamber 11 which is formed between the rear wall 11a of the chamber and a baffle 17 having an upper skimming edge for removing froth and the like from the stock slurry.
  • the froth which flows over the top edge of the baffle l7 may be removed through a lateral opening 18.
  • the chamber above the baffle 17 is pressurized with air through a suitable air inlet 19.
  • the top of the headbox is closed by removable cover 20 held in place by toggle bolts 21 and 22.
  • the stock from the chamber 11 flows into the slice chamber 12 through a support plate 24 which has flow openings 25 formed therein.
  • the stock flow first enters a first portion 27 of the slice chamber 12. This first portion 27 is inclined upwardly and leads to a second curved portion 28.
  • the portion 28 provides a transition between the first portion 27 and a third portion 29 which is tapered and slopes downwardly toward the slice opening 13.
  • the first portion 27 of the slice chamber provides an upward component of flow and is sufficiently large so that the mean velocity of stock flow is relatively low, i.e., the channel thickness or height is relatively large.
  • the slice chamber is shaped to cause the stock to sweep in a curvature changing its course from an upward flow to a downward flow. It is this curved transition from a relatively slow upward sweep to a downward sweep, through the curved section 28, which tends to purge or remove the air which would otherwise accumulate along trailing elements 26 which are located in the slice chamber.
  • the trailing elements are related in Construction and position to the slice chamber and have a first nonflexible portion 30 in the first portion 27 of the chamber. These portions 30 are rigid and are positioned in the direction of flow to divide the chamber into flow channels between them.
  • the elements 30 extend continuously in a cross-machine direction and are mounted on their upstream ends by ball and socket mountings which support them in operation and which permit ready removal for replacement and servicing.
  • the ball and socket mountings are in the form of enlarged ends 30a on the trailing elements 30 which slide sideways into grooves in the plate 24.
  • the ends 300 provide a pivotal mount for the rigid trailing members 30. This permits the rigid trailing members 30 to respond, or in other words to be selfpositionable, responsive to hydraulic flow. In some instances this mount may be rigid, but a pivotal support is preferred.
  • Second portions 31 Attached to the downstream ends of the first portions 30 of the trailing elements are second portions 31. These second portions are also rigid and are curved to conform to the curvature of the second portion 28 of the slice chamber. These curved sections are of plastic, such as Lexan or other materials. They can be made by the extrusion process and are thus readily available at any length at relatively low cost.
  • the second portions 31 of the trailing elements are suitably attached to the heavier first portions 30 such as by welding or cementing or other suitable connection.
  • a preferred embodiment is to attach the curved trailing portions 31 to the first portions 30 by a flexible attachment such as a ball and socket joint.
  • the portions 31 and the portions 30 will then be free to pivot relative to each other, and the ball and socket joint will be located at position 31a.
  • third portions 32 which are flexible trailing elements. These third portions are located in the third portion 29 of the slice chamber.
  • the third portions 32 are flexible with their downstream ends unattached and are constructed to be self-positionable so as to be solely responsive to forces in the stock flowing in the chamber portion 29.
  • a plastic is chosen for the construction of these portions 32 which has a specific weight close to that of the stock, so that their weight is not a factor in their floating position within the tapered portion of the slice chamber.
  • portions 32 are preferably continuous across the width of the machine, they may be divided into strips with each strip being flat and narrow, or the strips may be in the form of divided filaments which are round or have other cross-sectional shapes, and in effect, act as trailing strands within the chamber section 29.
  • the slice chamber has a floor portion 36 which is shaped to provide the increasing velocity sweeping flow pattern above described.
  • the roof of the slice chamber has a downstream portion 33 which is pivotally mounted at 35 to control the width of the slice opening.
  • a jack 34 is attached to the roof portion 33 to raise or lower it.
  • a headbox for delivering stock to a forming surface, the headbox having a chamber leading to a slice chamber with a slice opening, the improvement comprising:
  • top and bottom slice walls defining a slice chamber therebetween with the slice chamber having a first upwardly inclined portion, a second arcuate portion leading upwardly and then downwardly, and a third tapered portion leading to the opening;
  • thin planar continuous cross-machine extending trailing elements having a rigid planar portion anchored at their upstream ends in said first portion of the slice chamber, a nonflexible portion curved in the direction of said second portion and located therein, and a third portion in the tapered chamber being flexible with the downstream ends unattached and constructed to be self-positionable as to be solely responsive to forces exerted thereon by the stock flowing toward the slice opening;
  • a headbox for delivering stock to a forming surface, the headbox having a chamber leading to a slice chamber with a slice opening constructed in accordance with claim 1:
  • said support means on which the trailing elements are supported at their upstream ends is a perforate plate extending across the opening to the slice chamber.
  • a headbox for delivering stock to a forming surface having a headbox chamber leading to a slice chamber having a slice opening constructed in accordance with claim 1:
  • headbox chamber extends vertically downwardly and opens laterally into the slice chamber.
  • a headbox for delivering stock to a forming surface, the headbox having a headbox chamber leading to a slice chamber having a slice opening constructed in accordance with claim 1:
  • the slice chamber continually narrows from the first portion to the slice opening.
  • a headbox for delivering stock to a forming surface, the headbox having a headbox chamber leading to a slice chamber having a slice opening constructed in accordance with claim 1:
  • a headbox for delivering stock to a forming surface, the headbox having a chamber leading to a slice chamber with a slice opening constructed in accordance with claim 1:
  • a headbox for delivering stock to a forming surface, the headbox having a headbox chamber leading to a slice chamber having a slice opening, the improvement comprising:
  • top and bottom slice walls dfining a slice chamber therebetween with the slice chamber extending upwardly and then downwardly toward the slice opening;
  • a headbox for delivering stock to a forming surface, the headbox having a headbox chamber leading to a slice chamber having a slice opening constructed in accordance with claim 7.
  • the upwardly extending portion is of a greater size than the downwardly extending portion so that the speed of stock flow increases.
  • a headbox for delivering stock to a forming surface, the headbox having a headbox chamber leading to a slice chamber having a slice opening constructed in accordance with claim 7:
  • first portion curves upwardly and turns to join the downwardly curving second portion and the trailing elements are correspondingly curved with the curved portions being rigid.
  • a headbox for delivering stock to a forming surface, the headbox having a headbox chamber leading to a slice chamber having a slice opening constructed in accordance with claim 7:
  • trailing elements have a first rigid portion and a downstream flexible portion attached at their upstream ends only and the flexible portions constructed to be self-positionable and solely responsive to forces exerted thereon by the stock flowing toward the slice opening.
  • a headbox for delivering stock to a forming surface, the headbox having a headbox chamber leading to a slice chamber having a slice opening constructed in accordance with claim 7:

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US00339219A 1973-03-08 1973-03-08 Papermaking machine headbox with an upwardly inclined slice chamber portion, an arcuate portion, and a downwardly inclined portion and containing flexible trailing members Expired - Lifetime US3853697A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00339219A US3853697A (en) 1973-03-08 1973-03-08 Papermaking machine headbox with an upwardly inclined slice chamber portion, an arcuate portion, and a downwardly inclined portion and containing flexible trailing members
JP49025335A JPS5233202B2 (enrdf_load_stackoverflow) 1973-03-08 1974-03-06
GB1030874A GB1456573A (en) 1973-03-08 1974-03-07 Headbox for a paper-making machine
IT49094/74A IT1004354B (it) 1973-03-08 1974-03-07 Cassa d afflusso perfezionata per macchine per la fabbricazione di carta
CA194,273A CA1009486A (en) 1973-03-08 1974-03-07 Converflo secondary headbox
BR1771/74A BR7401771D0 (pt) 1973-03-08 1974-03-08 Construcao de caixa-cabeca para alimentacao de material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00339219A US3853697A (en) 1973-03-08 1973-03-08 Papermaking machine headbox with an upwardly inclined slice chamber portion, an arcuate portion, and a downwardly inclined portion and containing flexible trailing members

Publications (1)

Publication Number Publication Date
US3853697A true US3853697A (en) 1974-12-10

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US00339219A Expired - Lifetime US3853697A (en) 1973-03-08 1973-03-08 Papermaking machine headbox with an upwardly inclined slice chamber portion, an arcuate portion, and a downwardly inclined portion and containing flexible trailing members

Country Status (6)

Country Link
US (1) US3853697A (enrdf_load_stackoverflow)
JP (1) JPS5233202B2 (enrdf_load_stackoverflow)
BR (1) BR7401771D0 (enrdf_load_stackoverflow)
CA (1) CA1009486A (enrdf_load_stackoverflow)
GB (1) GB1456573A (enrdf_load_stackoverflow)
IT (1) IT1004354B (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4063997A (en) * 1975-02-25 1977-12-20 Valmet Oy Hydraulic headbox and a gas enclosure communicating therewith
US4128455A (en) * 1977-05-20 1978-12-05 Beloit Corporation Headbox trailing element mounting and method
US4133715A (en) * 1977-03-29 1979-01-09 Beloit Corporation Headbox and holders for floating slice chamber dividers
DE2800547A1 (de) * 1977-12-13 1979-06-21 Escher Wyss Gmbh Stoffauflaufvorrichtung einer papiermaschine
US4181568A (en) * 1977-07-13 1980-01-01 Oy Tampella Ab Headbox for a paper machine for the production of a fiber web of at least two plies
US4298429A (en) * 1979-09-17 1981-11-03 Beloit Corporation Means for effecting cross direction fiber orientation in a papermaking machine headbox
US4373993A (en) * 1980-03-07 1983-02-15 Mitsubishi Jukogyo Kabushiki Kaisha Slice lip forming a smooth continuous surface
US4414062A (en) * 1981-11-18 1983-11-08 Valmet Oy Headbox of a paper machine
US5510005A (en) * 1994-07-25 1996-04-23 Westvaco Corporation Venturi headbox for a papermaking machine
US5569360A (en) * 1993-10-29 1996-10-29 Valmet Corporation Multi-layer headbox
WO1998051856A1 (en) * 1997-05-12 1998-11-19 Beloit Technologies, Inc. A trailing element device

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2728272A (en) * 1954-07-19 1955-12-27 Sandy Hill Iron & Brass Works Inlet for paper machine
US3528882A (en) * 1964-07-23 1970-09-15 Black Clawson Co Reinforced headbox for paper machine
US3598696A (en) * 1968-02-14 1971-08-10 Beloit Corp Multiple stage hydraulic headbox
US3607625A (en) * 1968-01-17 1971-09-21 Beloit Corp Headbox
US3769153A (en) * 1971-03-19 1973-10-30 Beloit Corp Papermaking machine headbox with multiple stiff, vibrational rods or plates extending downstream in the slice chamber

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2728272A (en) * 1954-07-19 1955-12-27 Sandy Hill Iron & Brass Works Inlet for paper machine
US3528882A (en) * 1964-07-23 1970-09-15 Black Clawson Co Reinforced headbox for paper machine
US3607625A (en) * 1968-01-17 1971-09-21 Beloit Corp Headbox
US3598696A (en) * 1968-02-14 1971-08-10 Beloit Corp Multiple stage hydraulic headbox
US3769153A (en) * 1971-03-19 1973-10-30 Beloit Corp Papermaking machine headbox with multiple stiff, vibrational rods or plates extending downstream in the slice chamber

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4063997A (en) * 1975-02-25 1977-12-20 Valmet Oy Hydraulic headbox and a gas enclosure communicating therewith
US4133715A (en) * 1977-03-29 1979-01-09 Beloit Corporation Headbox and holders for floating slice chamber dividers
US4128455A (en) * 1977-05-20 1978-12-05 Beloit Corporation Headbox trailing element mounting and method
US4181568A (en) * 1977-07-13 1980-01-01 Oy Tampella Ab Headbox for a paper machine for the production of a fiber web of at least two plies
DE2800547A1 (de) * 1977-12-13 1979-06-21 Escher Wyss Gmbh Stoffauflaufvorrichtung einer papiermaschine
US4298429A (en) * 1979-09-17 1981-11-03 Beloit Corporation Means for effecting cross direction fiber orientation in a papermaking machine headbox
US4373993A (en) * 1980-03-07 1983-02-15 Mitsubishi Jukogyo Kabushiki Kaisha Slice lip forming a smooth continuous surface
US4414062A (en) * 1981-11-18 1983-11-08 Valmet Oy Headbox of a paper machine
US5569360A (en) * 1993-10-29 1996-10-29 Valmet Corporation Multi-layer headbox
US5510005A (en) * 1994-07-25 1996-04-23 Westvaco Corporation Venturi headbox for a papermaking machine
WO1998051856A1 (en) * 1997-05-12 1998-11-19 Beloit Technologies, Inc. A trailing element device

Also Published As

Publication number Publication date
GB1456573A (en) 1976-11-24
JPS49124306A (enrdf_load_stackoverflow) 1974-11-28
JPS5233202B2 (enrdf_load_stackoverflow) 1977-08-26
BR7401771D0 (pt) 1974-11-19
CA1009486A (en) 1977-05-03
IT1004354B (it) 1976-07-10

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