US3585105A - Anti-deflection drain board method and apparatus - Google Patents

Anti-deflection drain board method and apparatus Download PDF

Info

Publication number
US3585105A
US3585105A US641568A US3585105DA US3585105A US 3585105 A US3585105 A US 3585105A US 641568 A US641568 A US 641568A US 3585105D A US3585105D A US 3585105DA US 3585105 A US3585105 A US 3585105A
Authority
US
United States
Prior art keywords
deflection
forming board
board
breast roll
forming
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
US641568A
Other languages
English (en)
Inventor
Louis M Stuebe
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.)
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
Application granted granted Critical
Publication of US3585105A publication Critical patent/US3585105A/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
    • D21F1/48—Suction apparatus
    • D21F1/483—Drainage foils and bars
    • D21F1/486—Drainage foils and bars adjustable

Definitions

  • the present invention relates to improvements in papermaking machines and more particularly to obtaining the improved dewatering and formation of a paper web in the initial forming area at the forming board by controlling the contour or deflection of the forming board in a positive manner relative to the breast roll.
  • a pervious forming wire passes over a breast roll to extend in a top forming run, and following the breast roll is a forming board.
  • the breast roll will deflect along its length so that it is lower at the center than at the ends, and different factors in machine operation will change the deflection of the breast roll and will also change the deflection of the forming board.
  • the factors which cause these changes do not affect the breast roll and forming board in the same way.
  • one of the forces on the breast roll is the wire tension and as the wire tension is changed the deflection in the breast roll changes and this normally has no effect on the forming board.
  • a factor which nonuni formly affects forming board and breast roll deflection is the force of the stock as it is distributed onto the wire. This force changes with the weight or quantity of stock distributed and speed of flow of the stock.
  • the wire will have to turn severely upwardly as it comes on to the forming board edge thus tending to throw the liquid stock upwardly. If the forming board leading edge is too low relative to the breast roll it will leave a gap between the wire and the forming board, and the wire will be unsupported so that improper drainage occurs at that location.
  • One of the substantial difliculties encountered is that the breast roll sags at its center due to the substantial weight of is lengh so that if the wire is to be supported and the proper relationship to the forming board maintained, the forming board must also be deflected downwardly in the center so that its deflection or contour is exactly the same as the breast roll.
  • a further object of the invention is to provide an improved forming board structure wherein its deflection can be controllably changed to match deflection of the breast roll which changes with wire tension and stock force changes and wherein an improved dewatering effect can be accomplished which provides uniform conditions completely across the machine.
  • a still further object of the invention is to provide an improved relationship between the forming board and breast roll so that optimum and uniform dewatering conditions occur across the machine and formation problems are avoided such as non-uniform dewatering which results in non-uniform moisture content across the machine, flocculation and unevenness of web formation, and disturbances in the uniform formation of the web from the stock.
  • the method and apparatus of the invention include in combination with a pervious travelling forming wire having an upper web forming run, a breast roll supporting the wire at the lead end of the run, a forming board means having an upper surface extending across beneath the wire following the breast roll and means for changing the contour or deflection of the board means along its length independent of other factors of machine operation.
  • FIG. 1 is a side elevational view shown in somewhat schematic form of a portion of a papermaking machine embodying the principles of the present invention
  • FIG. 2 is an exploded fragmentary showing of a portion of the mechanism of FIG. 1;
  • FIG. 3 is a sectional view taken substantially along line III-III of FIG. 1;
  • FIGS. 4 and 5 are schematic side elevational views showing the effects of improper operation such as is achieved with devices and methods heretofore available;
  • FIG. 6 is a fragmentary side elevational view showing another form of the invention.
  • FIG. 7 is a fragmentary side elevational view showing another form of the invention.
  • FIG. 8 is a fragmentary sectional view taken substantially along line VIII-VIII of FIG. 7.
  • FIG. 1 illustrates the forming zone in the wet end of a paper machine wherein a pervious travelling forming wire 10 is stretched over a breast roll 11 and has an upper forming run receiving a stock from the slice opening of a headbox 120.
  • a forming board means 12 which is located at an optimum position relative to the breast roll 11 and relative to the location where the stock is discharged onto the wire, but is not necessarily shown in exact size or in optimum location in the drawmgs.
  • the forming board 12 in FIGS. 1, 2 and 3 is shown as formed in portions or strips 13, 14 and 15 which extend across the machine and have gaps therebetween for the water being removed from the stock to flow downwardly.
  • a suitable saveall pan will be positioned for receiving the water.
  • the forming board strips 13, 14 and 15 are supported on frameork sections 16, 17 and 18 extending across the machine and having fins or webs 19 and 20 interconnecting them at laterally spaced locations.
  • Beneath the forming board 12 is a rigid supporting frame 23.
  • vertical sliding pins 21 and 22 extend downwardly through guide holes 24 and 25 in the frame 23. These pins are arranged to slide vertically and permit vertical deflection adjustment of the forming board 12.
  • the forming board is deflected or contoured along its length to the exact shape which will match the breast roll at any given operating condition so that the wire, carried by the breast roll, extends uniformly onto the forming board without being forced upwardly and without a gap occurring between the wire and the board.
  • FIG. 4 a forming board arrangement is shown wherein the upper surface of a forming board 34 is too high relative to the center of a breast roll 34.
  • the ends of the breast roll are shown at 32a at the dotted lines, and the center is shown at 32 by the solid line, with the difference in elevation caused by the sag of the center of the breast roll 32.
  • the wire 33 at the ends as shown by the dotted line wire, properly engages the forming board 34. However at the center the wire has to be inclined upwardly to pass onto the forming board 34. Because of the stiffness and tension in the wire it will generally take the shape illustrated and curve upwardly at 33b so that stock on the wire tends to be thrown upwardly and the dewatering operation is consequently disturbed.
  • Uniform dewatering at the beginning of formation of the web is particularly important since non-uniformity will cause non-uniformity of dryness at locations further along the machine. Efforts to compensate for the unevenness and dryness often result in imperfections in the paper and a papermaker noticing the unevenness may erroneously conclude that other parts of the machine are operating improperly so that it is highly important that web formation and dewaten'ng at the forming board begin satisfactorily.
  • FIG. illustrates an arrangement where the forming board is lowered to match the center of the breast roll.
  • a breast roll 35 sags at the center as shown by the solid line drawing and is higher at the ends as shown at 35a.
  • a forming board 37 is positioned so that the wire 36 approaches it uniformly at the center of the breast roll 35. This however results in the wire edge 36a at the ends of the breast roll having a clearance between it and the forming board 37 so that improper formation of the web occurs at the ends.
  • the method and structure for changing the contour or deflection of the forming board includes the application of forces along the length of the forming board.
  • the force applying means is shown as including expansible chambers in the form of fluid bellows 26 and 27.
  • each bellows is equipped with an air pressure line which has a variable control valve in it so that the pressure within the bellows can be varied independent of the other bellows and thereby apply a force to obtain the proper deflection of the forming board 12 along its entire length.
  • l l l The bellows 26 and 27 are mounted on the support frame 23 which is carried at its ends on hanger bars and 31. The hanger bars are supported on the main frame by hanger bar supports 28 and 29.
  • the weight of the forming board 12 will cause it to bear downwardly against the bellows so that its vertical position will be a direct function of the upward force applied to it by each bellows.
  • the pins 21 and 22 are freely slideable in the frame 23 so that regardless of the control position of the forming board 12, the board will remain straight across the machine and not deflect in the machine direction.
  • FIG. 6 illustrates another arrangement for applying the vertical forces to the forming board.
  • a forming board assembly is shown with an upper member 41 having a smooth wire supporting surface at its top.
  • the forming board assembly includes forward and rear walls 48 and 49 which are arranged to form a closed chamber within the forming board and partitions 50 and 51 separate the assembly into an upper fluid chamber 42 and a lower fluid chamber 43. These chambers are arranged with fluid connections so that a temperature differential can be maintained between them and the differences in expansion of the metal of the walls 48 and 49 at their top and bottom cause a deflection of the upper surface of the forming board 40.
  • the upper chamber has an inlet 44 and an outlet 45
  • the lower chamber has an inlet 46 and an outlet 47.
  • cool water or refrigerant can be run into the top chamber 42 and hot water or steam placed in the lower chamber 43. While it is possible to deflect the upper surface of the forming board by merely cooling the upper chamber or heating the lower chamber, with the other chamber remaining substantially at room temperature, better control can be obtained by positively controlling the temperature of each of the chambers 42 and 43 for positive temperature differential and a positive resultant deflection of a forming board. It will be apparent from the foregoing that different heating and cooling arrangements can be used such as with electrical heating elements at the base of the forming board assembly and electrical cooling elements at the upper portion. For example thermo-couple elements may be used for his purpose.
  • a vertical force is applied to the forming board by a weight.
  • the weight is illustrated as conveniently applied by chambers for liquid beneath the members 60, 61 and 62 of the forming board means 55.
  • the forming board is arranged so that tanks or chambers 63, 64 and 65 are a part of the assembly and are arranged so that a controlled quantity of liquid can be contained in each tank.
  • Webs or plates 66 and 67 extend between the tanks, and baffles 68 extend through the tanks, the baffles being provided with openings 69 so that the liquid level remains the same across the tank.
  • Liquid such as water is directed into the tank through a supply line 75 through an inlet 72.
  • the tank can be drained through a valve outlet 74.
  • An air vent 76 at the top of the tank permits the level to be changed.
  • the tank assembly is supported on a main frame by hangers 70 and 71 which are positioned so that the ends of the upper surface of the forming board are at the proper location relative to the ends of the breast roll.
  • a pervious travelling forming wire having an upper forming run
  • a breast roll supporting the wire at the lead end of said run
  • a forming board means spaced from the breast roll having an upper surface beneath the forming wire having a length which extends transversely across the wire
  • said force applying means includes a plurality of expansible pressure chambers each having a movable Wall contacting the board means for applying a force therealong controlling the deflection proportional to the applied force.
  • said force applying means includes a plurality of expansible bellows each with a fluid pressure line, and means for delivering pressure to said lines at individually controlled pressures.
  • said changing means includes first and second temperature elements rigidly connected to said board means with deflection of the board means changing as the temperature differential between said first and second elements changes, and means for controllably changing the temperature of at least one of said temperature elements.
  • thermoelectric elements extend longitudinally along said forming board means and are hollow for the receipt of fluid at different temperatures, and means for delivering fluid at different temperatures to said hollow temperature elements.
  • said changing means includes means for applying weight along the length of the board means for controlling the force applied.
  • said changing means includes a chamber means extending along the length of the board means for containing a liquid, and means for changing the quantity of liquid in said chamber means.
  • breast rolls supporting the wire and a forming board means spaced from the breast roll and with its length extending transversely to said wire generally parallel to said breast roll,
  • the method of positively controlling the deflection of the upper surface of the forming board means including the steps of applying a positive control force along the length of the forming board means to change its deflection with change in deflection of the breast roll independent of stock flow rate and quantity and independent of wire tension.

Landscapes

  • Paper (AREA)
  • Laminated Bodies (AREA)
  • Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
US641568A 1967-05-26 1967-05-26 Anti-deflection drain board method and apparatus Expired - Lifetime US3585105A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US64156867A 1967-05-26 1967-05-26

Publications (1)

Publication Number Publication Date
US3585105A true US3585105A (en) 1971-06-15

Family

ID=24572937

Family Applications (1)

Application Number Title Priority Date Filing Date
US641568A Expired - Lifetime US3585105A (en) 1967-05-26 1967-05-26 Anti-deflection drain board method and apparatus

Country Status (2)

Country Link
US (1) US3585105A (enrdf_load_stackoverflow)
GB (1) GB1225517A (enrdf_load_stackoverflow)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3836428A (en) * 1972-08-25 1974-09-17 Albany Int Corp Adjustable slot suction box cover
US4232092A (en) * 1978-11-24 1980-11-04 Beloit Corporation Method of and means for precision mounting of members on elongate metallic supporting structure
US4321108A (en) * 1980-09-08 1982-03-23 Beloit Corporation Fourdrinier table
US4684441A (en) * 1986-07-09 1987-08-04 Papyrus Inc. Method for operably adjusting a leading, forming board strip
WO1987006633A1 (en) * 1986-04-30 1987-11-05 Viljo Klemetti Method for regulating the cross-direction profile of a paper web and equipment for the application of the method
US4718983A (en) * 1986-07-09 1988-01-12 Papyrus Inc. Forming board structure having an adjustable leading forming board strip
US5061347A (en) * 1989-09-02 1991-10-29 Sulzer-Escher Wyss Gmbh Adjustable ledge for the sheet forming zone of a papermaking machine
US5084138A (en) * 1990-11-13 1992-01-28 Beloit Corporation Deflection compensated forming wire turning bar
DE4107653A1 (de) * 1991-03-09 1992-09-10 Escher Wyss Gmbh Entwaesserungseinrichtung fuer die nasspartie einer papiermaschine
US5164048A (en) * 1990-08-29 1992-11-17 Measurex Corporation Cooling structure for stabilizing the temperature of beams in a sheet-making apparatus
US5387320A (en) * 1991-06-26 1995-02-07 Valmet Paper Machinery, Inc. Twin-wire web former in a paper machine
US5635032A (en) * 1992-06-12 1997-06-03 Sulzer-Escher Wyss Gmbh Double wire former
US20030136539A1 (en) * 2002-01-24 2003-07-24 Klaus Bartelmuss Device for adjusting the position of a wiper strip with respect to the screen in a papermaking plant
US20040163787A1 (en) * 2003-02-20 2004-08-26 Klaus Bartelmuss Apparatus for treating a wire or a felt band in a papermaking installation

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI103995B1 (fi) * 1993-06-17 1999-10-29 Valmet Paper Machinery Inc Menetelmä ja laite sekä säätöjärjestely paperikoneessa paperirainan poikittaisen profiilin hallinnassa

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3836428A (en) * 1972-08-25 1974-09-17 Albany Int Corp Adjustable slot suction box cover
US4232092A (en) * 1978-11-24 1980-11-04 Beloit Corporation Method of and means for precision mounting of members on elongate metallic supporting structure
US4321108A (en) * 1980-09-08 1982-03-23 Beloit Corporation Fourdrinier table
WO1987006633A1 (en) * 1986-04-30 1987-11-05 Viljo Klemetti Method for regulating the cross-direction profile of a paper web and equipment for the application of the method
US4684441A (en) * 1986-07-09 1987-08-04 Papyrus Inc. Method for operably adjusting a leading, forming board strip
US4718983A (en) * 1986-07-09 1988-01-12 Papyrus Inc. Forming board structure having an adjustable leading forming board strip
US5061347A (en) * 1989-09-02 1991-10-29 Sulzer-Escher Wyss Gmbh Adjustable ledge for the sheet forming zone of a papermaking machine
US5164048A (en) * 1990-08-29 1992-11-17 Measurex Corporation Cooling structure for stabilizing the temperature of beams in a sheet-making apparatus
US5084138A (en) * 1990-11-13 1992-01-28 Beloit Corporation Deflection compensated forming wire turning bar
DE4107653A1 (de) * 1991-03-09 1992-09-10 Escher Wyss Gmbh Entwaesserungseinrichtung fuer die nasspartie einer papiermaschine
US5262010A (en) * 1991-03-09 1993-11-16 Sulzer Escher Wyss Gmbh Dewatering device with adjustable force elements for the web-forming section of a papermaking machine
US5387320A (en) * 1991-06-26 1995-02-07 Valmet Paper Machinery, Inc. Twin-wire web former in a paper machine
US5635032A (en) * 1992-06-12 1997-06-03 Sulzer-Escher Wyss Gmbh Double wire former
US20030136539A1 (en) * 2002-01-24 2003-07-24 Klaus Bartelmuss Device for adjusting the position of a wiper strip with respect to the screen in a papermaking plant
US7005039B2 (en) * 2002-01-24 2006-02-28 Klaus Bartelmuss Device for adjusting the position of a wiper strip with respect to the screen in a papermaking plant
US20040163787A1 (en) * 2003-02-20 2004-08-26 Klaus Bartelmuss Apparatus for treating a wire or a felt band in a papermaking installation
US7175744B2 (en) * 2003-02-20 2007-02-13 Klaus Bartelmuss Apparatus for treating a wire or a felt band in a papermaking installation

Also Published As

Publication number Publication date
GB1225517A (enrdf_load_stackoverflow) 1971-03-17

Similar Documents

Publication Publication Date Title
US3585105A (en) Anti-deflection drain board method and apparatus
US4331510A (en) Steam shower for improving paper moisture profile
US5304285A (en) Stock-inlet for papermaking machine
US6423184B2 (en) Method and equipment for regulation of the initial part of the dryer section in a paper machine
EP1099793B1 (en) Method and device in the regulation of the headbox
EP0168408A1 (en) Louvered steam box for controlling moisture profile of a fibrous web
EP0516601B1 (en) Wire loading device in a paper machine
US2345647A (en) Papermaking machine
US5552021A (en) Method, device and arrangement for regulating the control of a transverse profile of a paper web in a paper machine
US2881674A (en) Papermaking machine
US3357880A (en) Apparatus for making fibrous webs
US3215593A (en) Headbox for twin wire paper making apparatus
US4249992A (en) Steam shower for adjusting paper moisture profile
US4565603A (en) Method and device for reducing disturbances during paper web formation
US4416730A (en) Wire end section of a paper making machine
US3313681A (en) Headbox with bottom wall having controllable deflection
US3574338A (en) Steam distribution system
US3440136A (en) Papermaking apparatus including two wire sheet formers having means for air purging
US5084138A (en) Deflection compensated forming wire turning bar
US3407114A (en) Cross machine control in papermaking
US3945570A (en) Steam supply apparatus
US3149026A (en) Air assisted formation method and apparatus
US3840430A (en) Twin-wire papermaking machine wherein the forming wires pass through the slice chamber which contains flexible trailing elements
FI63077C (fi) Foerfarande och anordning foer reglering av profilen av en fiberbana i en pappersmaskin
US3734822A (en) Headbox for vertical double-wire paper machine