US3902961A - Adjustable slice lip for a headbox - Google Patents

Adjustable slice lip for a headbox Download PDF

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Publication number
US3902961A
US3902961A US408087A US40808773A US3902961A US 3902961 A US3902961 A US 3902961A US 408087 A US408087 A US 408087A US 40808773 A US40808773 A US 40808773A US 3902961 A US3902961 A US 3902961A
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United States
Prior art keywords
slice
lip
wall
stock
chamber
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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
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US408087A
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English (en)
Inventor
Arnold J Roerig
Joseph D Parker
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Beloit Corp
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Beloit Corp
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Publication date
Application filed by Beloit Corp filed Critical Beloit Corp
Priority to US408087A priority Critical patent/US3902961A/en
Application granted granted Critical
Publication of US3902961A publication Critical patent/US3902961A/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
    • D21F1/028—Details of the nozzle section

Definitions

  • a paper making machine having a substantially horizontal fourdrinier wire supported on a breast roll and a headbox includes a slice lip construction for shortening and controlling the trajectory of stock emerging from the headbox slice by deflecting the stock stream downwardly against the wire and changing the deflection with change in size of slice opening to maintain an optimum slice strain angle relative to the wire.
  • One form of headbox has an elongate thin tapered slice chamber with the top wall and a bottom wall leading to a slice opening with the slice chamber inclined upwardly and the slice lip construction is positioned to direct the trajectory of stock onto the wire.
  • the invention relates to improvements in headboxes for use with fourdrinier type paper machines and particularly to obtaining more nearly homogeneous flow disturbances in the slice discharge jet than structures heretofore available by shortening the trajectory of stock emerging from the slice before it contacts the fourdrinier wire and controlling the trajectory angle to an optimum angle.
  • the stock should be subjected to controlled flow within the confines of the headbox as long as possible prior to discharge onto the traveling fourdrinier wire. Relatively long exposure of the trajectory of stock emerging from the headbox wil cause decay of the homogeneity present within the stock.
  • the width of the slice opening is changed to increase or decrease the thickness of the stock flow stream. This is done usually by raising or lowering the upper slice lip or raising or lowering the upper roof of the slice chamber in order to change the height of the slice opening.
  • This change has heretofore resulted in a change of the trajectory angle of the slice stream so that paper machine designers have had to compromise and construct the position of the slice chamber so that the optimum slice stream trajectory angle exists for only one adjustment size opening.
  • the deflector lip at the top side of the slice opening is changed in position so that it moves along a line extending between the distal edge of the lower slice lip and the distal edge of the upper slice lip. Movement along this path is approximated. in one form of construction. by mounting the upper deflector lip on a pivotal mount positioned so that with pivotal movement of the deflector slice lip. its distal edge will generally move along the path defined by the line extending through the distal edges of the upper and lower slice lips.
  • a further object ofthe invention is to provide a paper machine slice construction which permits adjustment ofthe angle of the stock stream emerging from the slice opening to an optimum angle relative to the position of the forming surface for achieving the best results in paper web formation on the forming surface.
  • FIG. 1 is a side elevational view. shown in section and somewhat schematic for purposes of illustration. of one FIG. 3 is a plan view of the structure of FIG. 2;
  • FIG. 4 is a diagrammatic view illustrating the location of the slice lip
  • FIG. 5 is a somewhat schematic view ofan alternative arrangement.
  • a breast roll supports a traveling forming wire I1.
  • Stock is fed onto the traveling forming wire from a headbox I2 and the trajectory of the stock steam is illustrated at 13.
  • the stock stream flow onto the wire must occur at an optimum location immediately after the top dead center of the breast roll so that immediate dewatering can begin.
  • the velocity of the flow of the stock is substantially at the speed of travel of the wire. If the flow impinges the portion of the wire supported on the breast roll. a phenomenon called pumping can occur as the water and stock are drawn through the wire. This is very undesirable because it disrupts the web formation on the wire as the wire leaves the breast roll.
  • the headbox 12. shown in FIG. I, is exemplary and in certain circumstances other forms of headboxes may be used.
  • the headbox has a chamber 14 into which the stock is delivered under pressure from suitable equipment such as a fan pump arrangement. and the stock flows through a plurality of parallel tubes 15 arranged across the headbox. the stock then containing turbulence with the fibers random oriented flows into a mixing chamber 16 to permit mixing and uniformity of flow.
  • the stock then flows through an upwardly inclined pre-slice chamber 17. It has been found desirable to provide the elongate tapered pre-slice chamber 17 in an upwardly angled position so that air entrained therein would be purged. An incline of 3 or more adequately satisfies this function.
  • divider plates 18 in the preslice chamber 17 supported at their upstream end only in a plate 16a having a plurality of openings aligned with the spaces between the plates.
  • These divider plates are preferably of polished stainless steel.
  • the plates 18 are in the upstream portion of this prcslice chamber 17 in the headbox which tapers somewhat down to a narrower portion where trailing flexible members 19 are supported at their upstream ends only, being self-positionable downstream due to forces of the flowing stock.
  • the trailing flexible elements 19 are anchored at their upstream ends only to the plates. as shown at 20, with their downstream ends 19a extending to near the slice opening 23.
  • the elongate trailing members 19 are preferably in the form of continuous plastic sheets extending across the headbox parallel to the slice opening 23. It has been found that the sheets cannot be divided into gaps of any appreciable width along their lengths (in the crossmachine direction) without creating ridges or crossmachine direction defects in the paper web.
  • an alternative form which may be used is to provide a plurality of substantially abutting or contiguous strands in the slice chamber instead of the sheets.
  • the strands are preferably in the form of thin plastic trailing elements separated from each other and either aligned in rows in a crossmachine direction or arranged in random fashion with the strands each anchored at their upstream ends.
  • the gap between adjacent elements in the cross-machine direction can be about equal to the plastic sheet thickness. However, it should never be so wide as to create streaks or ridges in the web.
  • the trailing elements extend substantially to the slice opening so that the homogeneity and random orientation ofthe fibers which has been achieved by the turbulence of the stock entering the headbox is maintained.
  • the homogeneity retention has been found to be superior in directing the flow of stock through a relatively narrow elongate thin tapered slice and dividing the slice into a plurality of strata by the trailing flexible elements.
  • the homogeneity will tend to begin to decay if the stock is permitted to be unconfined and uncontrolled when directed through a relatively long are of trajectory. Accordingly. in accordance With the principles of the present invention. the trajectory of the stock traveling upwardly through slice chamber 17a is immediately deflected downwardly upon exiting the slice lip, thereby reducing the length of time that the stock stream is uncontrolled.
  • an adjustable slice lip For deflecting the trajectory of the stock emerging from the slice opening.
  • an adjustable slice lip assembly 24 is provided.
  • the adjustable slice lip assembly 24 is shown in detail in FIG. 2.
  • the principle of location and path of movement of the slice lip will be described.
  • the general requirements include the slice chamber angled upwardly relative to the horizontal forming surface and the lower slice lip positioned in advance of the upper slice lip relative to the direction of stock flow.
  • the upper lip moves generally along a path dcfined by a line passing through the distal edges of the lower and upper slice lips.
  • An optimum form of construction which achieves various advantages and which causes the distal edge of the upper slice lip to move up proximately along this path is the pivotal mount for the upper slice lip.
  • the schematic showing of a slice chamber 46 includes a bottom slice chamber wall 40 and a top slice chamber wall 41, The slice opening 47 is provided between the distal edge 42 of the bottom wall. and a slice lip 43 which has a distal edge 44.
  • An imaginary line AA is drawn connecting the edge 44 of the slice lip and the edge 42 of the bottom wall.
  • the slice lip 43 must be adjusted so that its edge 44 moves along line AA.
  • the slice opening can be adjusted without affecting the angle of discharge significantly. That is. as the slice opening is changed by upward or downward movement of the upper roof of the slice chamber. about the pivot knuckle 2211 in FIG. 1.
  • the slice lip 34 in FIGS. 2 and 3 (43 in FIG. 4) can be adjusted to maintain the predetermined trajectory of the stock stream. It is essential that this be accomplished without varying the angle of discharge inasmuch as the location of the deposit of the stock on the traveling fourdrinier wire and the angle at which the stock stream approaches the wire is critical.
  • the slice lip is pivotally mounted so that the arc shown by the broken line 59.
  • the relationship above described will remain substantially the same. i.e.. the trajectory angle of the emerging stock stream will be unaffected by a change in slice openingv
  • the paper maker may make the adjustments by changing the pivotal position of the slice lip each time he changes the position of the roof to thereby change the slice opening.
  • mechanical linkages will interconnect the operation of the mechanism for positioning the slice roof and for positioning the slice lip. and this can be accomplished by mechanically inter-.
  • a slice lip 34 is secured to a cylindrical bar 33.
  • the bar is mounted in seat 32 on a slice lip support 31 carried on the top wall 22 of the slice chamber.
  • the cylindrical bar 33 is supported in its pivotal location by clamping members 38, FIG. 3. which are secured on the plate 3] by bolts 39.
  • the pivotal position of the slice lip 34 is changed by tilting operating arms 35.
  • the operating arms are tilted by adjusting tilting bolts 36.
  • Changing the angle of the tilting arms 35 will change the angle of the slice lip 34 thus changing the size of the slice opening. that is. the distance between the slice lip 34 and the distal edge 30 of the bottom wall 21 of the slice chamber.
  • These units. including arms 35 are positioned at intervals across the machine to make cross-machine profile corrections.
  • FIG. 5 Another form of changing the trajectory of the stock emerging from the slice opening is illustrated in FIG. 5.
  • the construction of FIG. 5 does not meet all of the objectives of the foregoing described invention and structure. but achieves related objectives.
  • the tip of the upper slice lip does not move along the path required for the objectives of the structure of FIGS. 1 through 4. and the construction of FIG. 5 is generally useful for one setting of the slice opening. and is useful in certain circumstances only. but does not provide the dexterity and wide range of control of the structure of FIGS. 1 through 4.
  • a breast roll carries a traveling fourdrinier wire 51.
  • a headbox has a lower slice wall 52 and atop slice wall 53. with a slice opening 56. Trailing flexible elements 57 extend substantially to the slice opening. The slice opening size is controlled by a slice lip 54.
  • the lower wall 52 is provided with a planar portion 55 which forms an approximately parallel surface relative to the plane of wire 51. The jet of stock is thereby quickly set onto the wire without distorting the shape of the lower slice chamber wall 52 by requiring it to extend up and over breast roll 50.
  • the flow stream must undergo an abrupt change in direction at the opening. However.
  • the variation in basis weight pro file has been significantly less with the employment of the principles of the present invention than with stock turbulence devices heretofore employed such as rectifier rolls.
  • the resulting paper has been found to have superior small scale uniformity and improved formation particularly with longer fiber furnish. An improved random orientation of the fibers generally results.
  • Other tests indicating improved fiber distribution include splitting the resultant sheet into layers and dctermining the filtration resistance of the layers.
  • tensile and tear tests show uniformity in machine direction and cross-machine direction. The formation tests indicate a provision of a paper sheet having better coatability and better printability. In other words. basis weight, caliper. tensile tear. Mullen strength. Sheffield smoothness, Gurley densometer. QNS/M formation. Z-direction tensile strength and 7ero span tensile strength tests indicate the resultant more uniform fiber distribution with an elongate relatively narrow upwardly inclined slice chamber having trailing selfpositionable members and a slice lip of the type described above.
  • the principles of the invention are not necessarily limited to use with a horizontal forming surface such as provided with a traveling fourdrinier wire.
  • the angle of the stock jet which enters the throat formed between a pair of traveling forming wires in a twin wire machine is critical.
  • the principles of the present invention may be employed to control the angle of stock jet in such a twin wire machine so that the jet engages the wires. and enters the throat of the twin wire machine at the optimum angle. That is. with changes in slice opening. the optimum angle of the stock stream relative to the twin wires can be obtained by adjustment of the slice lip which is constructed in the manner shown in FIG. 1 through 4.
  • the recitation of the forming surface in the claims is with reference to one of the forming wires when the invention is embodied in a twin wire machine.
  • a paper making machine comprising:
  • a headbox having opposed first and second slice walls forming a slice chamber with a slice opening for delivering a stock stream to said forming surface;
  • said forming surface extends substantially horizontal and the slice chamber is inclined upwardly to purge air from the chamber during operation.
  • said second slice lip is pivotally supported at a pivotal location upstream of the distal edge of said lip.
  • pivotal support includes a cylindrical member in a seat with means for clamping the cylindrical member in said seat.

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  • Treatment Of Fiber Materials (AREA)
US408087A 1972-02-24 1973-10-19 Adjustable slice lip for a headbox Expired - Lifetime US3902961A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US408087A US3902961A (en) 1972-02-24 1973-10-19 Adjustable slice lip for a headbox

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US22881472A 1972-02-24 1972-02-24
US408087A US3902961A (en) 1972-02-24 1973-10-19 Adjustable slice lip for a headbox

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US3902961A true US3902961A (en) 1975-09-02

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US408087A Expired - Lifetime US3902961A (en) 1972-02-24 1973-10-19 Adjustable slice lip for a headbox

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US (1) US3902961A (US20110232667A1-20110929-C00004.png)
JP (1) JPS5257201Y2 (US20110232667A1-20110929-C00004.png)
AR (1) AR200125A1 (US20110232667A1-20110929-C00004.png)
BR (1) BR7301364D0 (US20110232667A1-20110929-C00004.png)
CA (1) CA984196A (US20110232667A1-20110929-C00004.png)
DE (1) DE2307968A1 (US20110232667A1-20110929-C00004.png)
FR (1) FR2173349B1 (US20110232667A1-20110929-C00004.png)
GB (1) GB1417736A (US20110232667A1-20110929-C00004.png)
IT (1) IT979417B (US20110232667A1-20110929-C00004.png)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56128391A (en) * 1980-03-07 1981-10-07 Mitsubishi Heavy Ind Ltd Slice slip
DE3107926A1 (de) * 1981-03-02 1982-11-04 Escher Wyss Gmbh, 7980 Ravensburg Verfahren zum ausbilden einer mehrlagigen papierbahn in einem doppelsiebformer und doppelsiebformer zur durchfuehrung des verfahrens
US4734164A (en) * 1986-07-03 1988-03-29 Beloit Corporation Horizontal web-forming apparatus with curved nose forming board
US4981587A (en) * 1988-09-13 1991-01-01 Electric Power Research Institute, Inc. Sieve with adjustable throat mechanism discharge
US5149402A (en) * 1987-05-14 1992-09-22 Beloit Corporation Headbox having a primary stock flow and a laterally injected secondary flow
US6146500A (en) * 1998-06-19 2000-11-14 Kimberly-Clark Worldwide, Inc. Suction breast roll former and method, with flexible headbox roof
US6197161B1 (en) * 1999-06-17 2001-03-06 Voith Sulzer Paper Technology North America, Inc. Profile bar assembly for a headbox in a paper-making machine
DE10318035A1 (de) * 2003-04-19 2004-11-04 Voith Paper Patent Gmbh Stoffauflauf
US20080257794A1 (en) * 2007-04-18 2008-10-23 Valerio Thomas A Method and system for sorting and processing recycled materials
WO2010149413A2 (de) * 2009-06-22 2010-12-29 Voith Patent Gmbh Stoffauflauf für eine maschine zur herstellung einer faserstoffbahn
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

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109629307B (zh) * 2018-12-29 2021-06-08 绍兴州致电子有限公司 一种造纸机流浆箱

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2747471A (en) * 1952-11-06 1956-05-29 Black Clawson Co Head box for paper making machines
US3010510A (en) * 1958-01-23 1961-11-28 Rice Barton Corp Slice control mechanism
US3034578A (en) * 1959-01-29 1962-05-15 Valley Iron Works Company Nozzle blade lip
US3310461A (en) * 1964-04-20 1967-03-21 Beloit Corp Headbox for a papermaking machine
US3607625A (en) * 1968-01-17 1971-09-21 Beloit Corp Headbox
US3628589A (en) * 1968-01-31 1971-12-21 Time Inc Flow systems

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2747471A (en) * 1952-11-06 1956-05-29 Black Clawson Co Head box for paper making machines
US3010510A (en) * 1958-01-23 1961-11-28 Rice Barton Corp Slice control mechanism
US3034578A (en) * 1959-01-29 1962-05-15 Valley Iron Works Company Nozzle blade lip
US3310461A (en) * 1964-04-20 1967-03-21 Beloit Corp Headbox for a papermaking machine
US3607625A (en) * 1968-01-17 1971-09-21 Beloit Corp Headbox
US3628589A (en) * 1968-01-31 1971-12-21 Time Inc Flow systems

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56128391A (en) * 1980-03-07 1981-10-07 Mitsubishi Heavy Ind Ltd Slice slip
JPS616195B2 (US20110232667A1-20110929-C00004.png) * 1980-03-07 1986-02-24 Mitsubishi Heavy Ind Ltd
DE3107926A1 (de) * 1981-03-02 1982-11-04 Escher Wyss Gmbh, 7980 Ravensburg Verfahren zum ausbilden einer mehrlagigen papierbahn in einem doppelsiebformer und doppelsiebformer zur durchfuehrung des verfahrens
US4734164A (en) * 1986-07-03 1988-03-29 Beloit Corporation Horizontal web-forming apparatus with curved nose forming board
US5149402A (en) * 1987-05-14 1992-09-22 Beloit Corporation Headbox having a primary stock flow and a laterally injected secondary flow
US4981587A (en) * 1988-09-13 1991-01-01 Electric Power Research Institute, Inc. Sieve with adjustable throat mechanism discharge
US6146500A (en) * 1998-06-19 2000-11-14 Kimberly-Clark Worldwide, Inc. Suction breast roll former and method, with flexible headbox roof
US6197161B1 (en) * 1999-06-17 2001-03-06 Voith Sulzer Paper Technology North America, Inc. Profile bar assembly for a headbox in a paper-making machine
DE10318035A1 (de) * 2003-04-19 2004-11-04 Voith Paper Patent Gmbh Stoffauflauf
US20080257794A1 (en) * 2007-04-18 2008-10-23 Valerio Thomas A Method and system for sorting and processing recycled materials
WO2010149413A2 (de) * 2009-06-22 2010-12-29 Voith Patent Gmbh Stoffauflauf für eine maschine zur herstellung einer faserstoffbahn
WO2010149413A3 (de) * 2009-06-22 2011-02-24 Voith Patent Gmbh Stoffauflauf für eine maschine zur herstellung einer faserstoffbahn
CN102428228A (zh) * 2009-06-22 2012-04-25 福伊特专利公司 用于制造纤维材料幅的机器所用的流浆箱
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
DE2307968A1 (de) 1973-09-06
FR2173349A1 (US20110232667A1-20110929-C00004.png) 1973-10-05
AR200125A1 (es) 1974-10-24
CA984196A (en) 1976-02-24
IT979417B (it) 1974-09-30
BR7301364D0 (pt) 1974-05-16
FR2173349B1 (US20110232667A1-20110929-C00004.png) 1977-08-12
GB1417736A (en) 1975-12-17
JPS52108303U (US20110232667A1-20110929-C00004.png) 1977-08-17
JPS5257201Y2 (US20110232667A1-20110929-C00004.png) 1977-12-24

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