US3385754A - Stock distribution system - Google Patents

Stock distribution system Download PDF

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Publication number
US3385754A
US3385754A US431903A US43190365A US3385754A US 3385754 A US3385754 A US 3385754A US 431903 A US431903 A US 431903A US 43190365 A US43190365 A US 43190365A US 3385754 A US3385754 A US 3385754A
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United States
Prior art keywords
headbox
flow
tubes
stock
nozzle
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
US431903A
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English (en)
Inventor
Jr William H Burgess
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.)
West Virginia Pulp and Paper Co
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West Virginia Pulp and Paper Co
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 West Virginia Pulp and Paper Co filed Critical West Virginia Pulp and Paper Co
Priority to US431903A priority Critical patent/US3385754A/en
Priority to SE14882/65A priority patent/SE359334B/xx
Application granted granted Critical
Publication of US3385754A publication Critical patent/US3385754A/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
    • 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 present invention is directed to a novel headbox of compact construction and more particularly, to a headbox of the type generally referred to as a secondary headbox.
  • a headbox As is well known in the art, the function of a headbox is to convert the flow of paper stock in the tubular conduits upstream of the headbox to a flat, substantially rectangular configuration for deposition on the forming surface while maintaining the fibers uniformly dispersed throughout the suspension and dampening out eddies, cross fiows, pressure surges and other fiow irregularities.
  • prior art headboxes usually include an elongated flow path to provide time for flow irregularities to dissipate and one or more expedients, such as expansion chambers, to insure a uniform dispersion of fibers throughout the flow.
  • baffies or weirs are often used to effect one or more flow reversals and, in this "ice way, elongate the path of the stock through the headbox.
  • the layer of stock deposited by the primary headbox must pass beneath the secondary headbox, it is desirable to maintain the undersurface thereof spaced from the forming surface. Otherwise the primary stock may splash up on the undersurface of the secondary headbox causing rusting and corrosion thereof. Aside from shortening the life of the headbox, the rust, dried stock and the like will eventually drop off onto the partially drained stock and result in an unacceptable product.
  • an object of the present invention to provide a headbox which eliminates the deficiencies of conventional secondary headboxes noted above and yet is of unusually compact design and adapted, for the most part, to be spaced from the forming surface a distance suflicient to prevent the buildup of impurities thereon.
  • means are provided for dampening pressure surges in the fluid system and maintaining uniform fiber dispersion, in combination with means for preventing undue turbulence or cross fiows from affecting the jet at the slice.
  • the headbox of the present invention eliminates the necessity of acute turns and flow reversals in the flow path and thereby eliminates a source of large scale eddies.
  • FIGURE 1 is a side, elevational view of the wet end of a fourdrinier paper machine incorporating the headbox of the present invention
  • FIGURE 2 is a top view of the headbox of the present invention.
  • FIGURE 3 is a side, elevational view thereof, partly in section;
  • FIGURE 4 is an enlarged view of a portion of one of the inlet tubes of the present headbox showing the inlet orifice insert;
  • FIGURE 5 is a sectional view showing the arrangement of tubes interconnecting the manifold and headbox.
  • FIGURE 1 of the drawings there will be seen a paper machine wet end of, for the most part, conventional construction and including a primary headbox 1 and a forming surface 2, consisting of a foraminous, endless belt 3 supported by a breast roll 4, a couch roll 5, a plurality of table rolls 6 and suction boxes 7.
  • Dilute paper stock is supplied to the headbox 1 by means of the manifold 8 and, after passing therethrough, is ejected at the slice 9 onto the forming surface 2. As the stock thus deposited travels downstream on the forming surface, liquid is drained therefrom through the forming surface, assisted by the table rolls 6 and suction boxes 7, to form a loosely felted mat of fibers.
  • the secondary headbox 10 of the present invention Suspended over the forming surface downstream of the primary headbox is somewhat schematically shown, the secondary headbox 10 of the present invention.
  • the secondary headbox includes front and back walls 11 and 12, side walls 13 and a top wall 14 defining an upper vat portion of the headbox.
  • front wall 11 is joined by a filter piece 15 consisting of a downwardly and rearwardly sloped plate member 16 and a downwardly and forwardly sloped plate member 17.
  • each of the side walls 13, together with an outlet plate 18 and a downwardly and forwardly sloped bottom wall 19, comprise a lower vat portion 20 in fluid communication with a nozzle portion 21.
  • Nozzle portion 21 includes parallel side walls 22 and parallel, downwardly sloped top and bottom walls 23 and 24.
  • At its lower end nozzle 21 terminates in an adjustable slice assembly 25 including a stationary, lower slice lip 26 and an adjustable upper slice lip 27.
  • gross adjustments of the slice opening may be made by means of the handle 28 and associated linkage while fine adjustment at selected points across the slice is accomplished by the micro-adjustment handles 29.
  • a manifold 32 Extending across the rear of the headbox 10, a manifold 32 is provided having parallel, tapered, top and bottom walls 33, a back wall 34 and a front wall 35. Front wall 35 has formed therein throughout its extent a plurality of apertures each receiving the inlet end of a tube 36.
  • the tubes 36 are relatively short in length, and as best seen in FIGURE 3, are slightly curved; whereby the upper wall of the manifold 32 is disposed somewhat below the uppermost portion of the outlet ends of the top rows of tubes.
  • the outlet ends of the tubes 36 are received in a plurality of apertures formed in outlet plate member 18, while adjacent their inlet ends, the tubes are each provided with an orifice insert 37.
  • the tubes may be arranged in a plurality of rows, three being shown, with adjacent rows offset with respect to one another; although it will be apparent that other arrangements are possible within the scope of the present invention.
  • the orifice inserts 37 are each received in the inlet end of a tube 36 which has been reamed a distance equal to the depth of the insert to form an annular shoulder 38.
  • the insert itself is centrally apertured to provide a straight sided central portion 39 and sloped inlet and outlet portions 40 and 41, respectively.
  • a rotating shower 42 may be provided in an upper portion of the vat and a series of rectifier rolls 43, 44 and 45 positioned in the flow path from the inlet plate 18 to the slice assembly 25.
  • dilute paper stock is supplied under pressure to the manifold 32 at its inlet end 46 from whence it flows toward its outlet end 47. Due to the tapered configuration of the manifold, the pressure at all points along its length may be maintained substantially constant; whereby the dilute stock is supplied to the tubes 36 at nearly equal pressures.
  • the head loss that will occur in a flow when it abruptly passes from a pipe of one dimension to a pipe of larger cross sectional area may be calculated by the formula:
  • A is the cross sectional area of the smaller tube
  • A is the cross sectional area of the larger tube
  • V is the velocity of the fluid in the smaller tube
  • g is the gravitational constant
  • the orifice inserts 37 are tapered outwardly, as at 41, from the restricted portion 39; thereby approximating the shape of the flow as it leaves the restricted portion and substantially eliminating the annularly shaped stagnant area that otherwise would exist.
  • K is an empirically determined constant for a given tube-insert combination and H V and g are as given above.
  • the total flow After passing through the tubes 36, the total flow enters the lower vat portion 20- free of cross flows and the like and with the fibers therein well dispersed throughout. It might be noted at this point that the combination of the short tube and orifice inserts also produces an advantageous result at the exits of the tube 66 which makes it particularly adapted for use in secondary headboxes.
  • the low flow rates characteristic of secondary headboxes would ordinarily require tubes of relatively small diameters to maintain the velocity in the tubes high enough to prevent settling and fioccing of the fibers and provide suflicient pressure loss to minimize the effect of pressure surges.
  • a rotating rectifier roll as at 43, may be provided adjacent the outlets of the tubes 36 to aid in blending the jets issuing therefrom. Additionally, the use of a rectifier roll at this point will provide further head loss, and, prevent the formation of large scale eddies which might result from reflections of the stock flow from the plate 17.
  • a second rotating rectifier roll, 44 is positioned in the nozzle portion 21 adjacent its connection to the lower v-at portion 20.
  • the flow is turned, with the assistance of the filler piece 15, from the lower vat portion to the nozzle, there is a tendency for the stock to separate from the bottom wall 24 of the nozzle.
  • this tendency is eliminated and a smooth transition into the nozzle attained.
  • An additional roll, as at 45, may also be provided adjacent the lower portion of the nozzle 21. As the stock descends downwardly in the nozzle, a portion of the flow may, depending upon the particular operating conditions, become detached from one or the other of the walls 23, 24 by the time the stock reached the lower portion of the nozzle. The use of the rotating, rectifier roll 45 at this point however, serves to maintain a full, uniform flow through to the slice.
  • a paper machine including a breast roll, a couch roll spaced from said breast roll, an endless foraminous belt trained about said rolls and providing a substantially planar forming surface, a primary headbox located adjacent said breast roll and a secondary stock distribution system, including a manifold and a secondary headbox, suspended above said forming surface, extending transversely thereof and located intermediate said rolls downstream of said primary headbox, the improvement comprising said secondary stock distribution system further including:
  • the apparatus of claim 1 further including:
  • each of said inserts having a portion defining an aperture therein of smaller cross sectional area than the internal cross sectional area of the tube within which it is received, and
  • a rotatable rectifier roll is positioned within said nozzle adjacent said lower vat portion.
  • a second rotatable rectifier roll is positioned within said lower vat portion adjacent the point of connection of said tubes with said lower vat portion
  • said nozzle includes parallel top and bottom walls and parallel side walls extending between said top and bottom walls,
  • a filler piece is provided adjacent the upper end of said nozzle top wall extending inwardly of said vat portion.
  • each of said tubes is approximately five to nine times as long as its inside diameter.
  • a headbox comprising:
  • vat portion including an upper vat portion and a lower vat portion having common side walls
  • said upper vat portion being substantially rectangular in cross section and terminating at its lower forward edge in a filler piece extending inwardly of the vat portion
  • said lower vat portion including an elongated, outlet plate having a plurality of apertures formed therein as a back wall and a downwardly sloping plate member as a bottom wall,
  • a downwardly sloping nozzle portion including parallel top and bottom walls and parallel side walls, (e) said nozzle portion side walls being coplanar with said vat portion side walls and said nozzle portion bottom wall joining said lower vat portion bottom wall at an angle,

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US431903A 1965-02-11 1965-02-11 Stock distribution system Expired - Lifetime US3385754A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US431903A US3385754A (en) 1965-02-11 1965-02-11 Stock distribution system
SE14882/65A SE359334B (enEXAMPLES) 1965-02-11 1965-11-17

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US431903A US3385754A (en) 1965-02-11 1965-02-11 Stock distribution system

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US3385754A true US3385754A (en) 1968-05-28

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878039A (en) * 1972-06-20 1975-04-15 Dominion Eng Works Ltd Paper machine headbox having convergent throat portion
DE2635939A1 (de) * 1976-08-10 1978-02-16 Armstrong Cork Co Sekundaerer aufgabekasten fuer das aufbringen einer auflage bei der herstellung von pappe
US4198270A (en) * 1977-05-23 1980-04-15 Sulzer Brothers Ltd. Head box for a paper making machine
JPS56128391A (en) * 1980-03-07 1981-10-07 Mitsubishi Heavy Ind Ltd Slice slip
US4414062A (en) * 1981-11-18 1983-11-08 Valmet Oy Headbox of a paper machine
US4897160A (en) * 1981-11-06 1990-01-30 J. M. Voith Gmbh Head box for a paper making machine
US20080138528A1 (en) * 2005-01-12 2008-06-12 Umicore Galvanotechnik Gmbh Method for Depositing Palladium Layers and Palladium Bath Therefor
US20110284178A1 (en) * 2010-05-20 2011-11-24 Honeywell International Inc. Apparatus and method for controlling curling potential of paper, paperboard, or other product during manufacture

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2942661A (en) * 1956-12-18 1960-06-28 Beloit Iron Works Multi-ply sheet former
US3119734A (en) * 1960-11-30 1964-01-28 Potlatch Forests Inc Stock inlet and headbox for paper making machines
US3164513A (en) * 1961-12-14 1965-01-05 West Virginia Pulp & Paper Co Distributor system for a paper machine headbox

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2942661A (en) * 1956-12-18 1960-06-28 Beloit Iron Works Multi-ply sheet former
US3119734A (en) * 1960-11-30 1964-01-28 Potlatch Forests Inc Stock inlet and headbox for paper making machines
US3164513A (en) * 1961-12-14 1965-01-05 West Virginia Pulp & Paper Co Distributor system for a paper machine headbox

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3878039A (en) * 1972-06-20 1975-04-15 Dominion Eng Works Ltd Paper machine headbox having convergent throat portion
DE2635939A1 (de) * 1976-08-10 1978-02-16 Armstrong Cork Co Sekundaerer aufgabekasten fuer das aufbringen einer auflage bei der herstellung von pappe
US4198270A (en) * 1977-05-23 1980-04-15 Sulzer Brothers Ltd. Head box for a paper making machine
JPS56128391A (en) * 1980-03-07 1981-10-07 Mitsubishi Heavy Ind Ltd Slice slip
US4897160A (en) * 1981-11-06 1990-01-30 J. M. Voith Gmbh Head box for a paper making machine
US4414062A (en) * 1981-11-18 1983-11-08 Valmet Oy Headbox of a paper machine
US20080138528A1 (en) * 2005-01-12 2008-06-12 Umicore Galvanotechnik Gmbh Method for Depositing Palladium Layers and Palladium Bath Therefor
US20110284178A1 (en) * 2010-05-20 2011-11-24 Honeywell International Inc. Apparatus and method for controlling curling potential of paper, paperboard, or other product during manufacture
US8728276B2 (en) * 2010-05-20 2014-05-20 Honeywell International Inc. Apparatus and method for controlling curling potential of paper, paperboard, or other product during manufacture

Also Published As

Publication number Publication date
SE359334B (enEXAMPLES) 1973-08-27

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