US3734822A - Headbox for vertical double-wire paper machine - Google Patents
Headbox for vertical double-wire paper machine Download PDFInfo
- Publication number
- US3734822A US3734822A US00081447A US3734822DA US3734822A US 3734822 A US3734822 A US 3734822A US 00081447 A US00081447 A US 00081447A US 3734822D A US3734822D A US 3734822DA US 3734822 A US3734822 A US 3734822A
- Authority
- US
- United States
- Prior art keywords
- slice
- slice lip
- extending
- tubes
- forming zone
- 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
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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
-
- 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
- the second slice lip is formed with a fixed upper section and a pivotally mounted lower section, and the first slice lip includes a chamber on the side opposite the second slice lip which has inlet and outlet openings which allow for heated liquid recirculation therethrough so that the first slice lip may be preheated and the opening between the slice lips adjusted before stock is passed therebetween.
- FIG-I Full 1 Claim, 2 Drawing Figures Patented May 22, 1973 FIG-I Full:
- Papermaking machines of the type utilizing a pair of vertically oriented opposed forming Wires have gained increasing acceptance in recent years.
- One reason for this acceptance is that the use of a pair of drainage surfaces greatly increases the dewatering rate and permits an appreciably shortened forming zone.
- the position of the slice jet with respect to the forming zone defined by the opposed wires must be controlled with greater precision than is required in a conventional Fourdrinier type machine where the papermaking stock is spouted out in a substantially horizontal plane and allowed to drop by gravity onto the forming surface of the machine.
- the slice jet is substantially vertically oriented, it is, in contradistinction to the horizontally directed jet of a Fourdrinier machine, susceptible to movement in two directions with respect to the vertical. It is, therefore, of importance to have a relatively stable jet.
- the temperature of the papermaking stock flowing through the headbox will generally be of appreciably greater temperature than that of the surrounding atmosphere. It will, therefore, tend to distort the components of the machine through differential heating. As a result, it is difficult, if not impossible, to adjust the slice opening until the stock has heated the headbox to a stable temperature.
- the present invention provides a headbox in which a series of tubes extend from the papermaking stock chamber to a slice or discharge opening defined by a pair of slice lips, one of which is substantially parallel to the forming zone of the papermaking machine and the other of which converges-toward the first.
- the first slice lip serves as a datum for orienting the remaining components of the machine with respect to the forming zone.
- the slice opening may be adjusted before the papermaking stock is run through the machine.
- FIG. 1 of the drawings is a vertical section illustrating principles of the present invention.
- FIG. 2 is an enlarged view of a portion of FIG. 1.
- a pair of endless porous belts l and 11 are trained about a pair of spaced parallel breast rolls 12 and 13 and support means, shown as couch rolls 14 and 15, positioned beneath the breast rolls and wrapped by the belts and 1 l to provide a pair of 0pposed, substantially vertically extending reaches 16 and 17 defining therebetween a forming zone 18.
- Headbox 20 Positioned above the forming zone defined by the reaches 16 and 17 is a headbox, referenced in its entirety by the numeral 20.
- Headbox 20 comprises a stock chamber 21 defined by front and back walls 22 and 23, a pair of side walls, only one of which is shown at 24, and a bottom wall 25.
- Bottom wall 25 slopes inwardly from the front and back walls 22 and 23 downwardly toward the forming zone defined by the reaches 16 and 17.
- a perforated roll 26 which may be of conventional construction and rotated by any suitable means, not shown.
- the headbox will be usually of the pressurized type and provided with an upper cover 27 and showers 28 to prevent the accumulation of stock particles on the interior of the headbox.
- a manifold 30 extends transversely of the papermaking machine and is tapered inwardly from its inlet end 31 to its outlet end 32 to provide stock at substantially uniform pressure to each of the connecting conduits 33 which extend from the manifold to the chamber 21.
- a spray shield 35 is mounted and serves to prevent liquid and the like carried by the belt 10 from being thrown up onto the lower surface of the box. In the absence of the shield 35 material thrown up onto the box would not only eventually cause corrosion, but particles would tend to drop from the bottom of the box onto the belt 10 and adversely offset the quality of the paper being made.
- shield 35 terminates in a trough 36 which may be drained 'by suitable drain means, not shown.
- a central portion of the bottom wall 25, defined by the vertically extending plates 40, has a series of openings formed therein and receives the inlet ends of a plurality of tubes 41 which extend from the bottom wall downwardly in parallel relationship to each other and are arranged in a plurality of rows extending transversely of the papermaking machine.
- the tubes are staggered with respect to each other, and as shown in FIG. 1, are arranged in seven transversely extending rows.
- a flat plate member 42 extends across the headbox and has a series of openings formed therein for receiving the outlet ends of the tubes 41.
- first slice lip having a substantially planar inner surface 51.
- Surface 51 as seen in FIG. 1 of the drawings, extends substantially parallel to the reaches 16 and 17 and is in substantial alignment with the forming zone defined therebetween.
- a second slice lip 52 having an inner surface 53 extending in opposed relationship to the surface 51 is also mounted beneath the box and extends in converging relationship to the surface 51 in the direction away from the outlet ends of the tubes 41 towards the forming zone.
- Slice lip 52 is formed in two sections, including an upper fixed section 54 which is rigidly attached to the bottom of the headbox, and a movable lower section 56 which is pivoted at 55 on the lower edge of the fixed section 54.
- a series of adjusting rods 57 are mounted across the headbox, only one being shown in FIG. 1, and serve to pivot section 56 about pivot point 55 and thereby to vary the space between the lower edges of the slice lips.
- ribs 58 and 59 extend from the bottom of the headbox to the lips 50 and 52, respectively, and serve as stiffeners. While only one of each of the ribs is shown it will be apparent that a plurality of such ribs are provided spaced along each of the slice lips.
- the outer edges of the tubes in the outermost rows of tubes are substantially aligned with the upstream ends of the two slice lips.
- planar surface 51 of the slice lip 50 is oriented in parallel relationship to the reaches 16 and 17 and substantially aligned with the center of the forming zone defined by the reaches. This construction, it has been found, greatly improves the stability of the jet issuing from the slice and decreases the tendency of the jet to wander from one surface to the other. While the surface 51 is described as substantially aligned with the forming zone it will be noted that this description contemplates small variations from an exact alignment of the surface 51 and the center of the forming zone. Similarly, the reaches 16 and 17, although described as substantially vertically oriented, will in practice, deviate somewhat from a precisely vertical plane.
- the surface 51 provides a datum plane from which the other components of the machine may be positioned and at the same time provides a highly stable jet of papermaking stock.
- the slice lip 52 through the provision of the lower pivoted section 56, permits the opening between the slice lips to be varied as necessary for varying operating conditions. Additionally, the force generated by the pressure of the papermaking stock, which must be resisted by the adjusting mechanism, is proportional to the surface area of the movable section. With only the lower portion of the slice lips movable, rather than the entire slice lip, this force is greatly decreased.
- the slice lip 50 is formed by a pair of spaced vertically extending walls 60 and 61 defining between them a chamber 62. It will be apparent, of course, that provision is made for sealing off the ends of the space defined by the walls 60 and 61, such as by end walls, one of which is shown at 63.
- a series of horizontally extending baffles 64 are mounted within the chamber 62 and serve to divide the chamber into a series of compartments 65. Openings 66 and 67 are formed in the upper and lower compartments 65, and each of the baffles is provided with openings 68 therethrough to provide interconnection between the compartments.
- a heated liquid may be pumped into the slice lip 50 through the upper opening 66, from a supply source 66', from whence it circulates downwardly through the various compartments 65 and outwardly through the lower opening 67.
- the slice lip may be preheated to the temperature of the papermaking stock, and the slice opening may be more accurately adjusted prior to the flow of stock through the slice opening.
- the liquid used to heat the slice lip 50 may be white water which may be tapped from the white water supply line so that the slice lip will have the same temperature as the stock. It will also be noted, that it will usually be preferable to provide the chamber 62 with a drain, as at 69, to permit the removal of sedimentation and like from the chamber.
- a papermaking machine including a pair of breast rolls positioned in spaced parallel relationship to each other, support means positioned beneath each of said breast rolls in spaced relation thereto, and an endless porous belt wrapping each of said breast rolls and support means therebelow to provide a pair of opposed vertically extending reaches defining a forming zone, the improvement comprising:
- a stock chamber having a bottom wall mounted above and extending across said papermaking machine
- said tubes being arranged in a plurality of rows transversely of said papermaking machine and extending in substantially parallel relationship to each other from said bottom wall toward said forming zone,
- a first slice lip having an inner substantially planar surface extending from outlet ends of said tubes to a point adjacent said breast rolls in substantially parallel relationship to said reaches and in substantial alignment with said forming zone
- a second slice lip having an inner surface mounted in opposed relationship to said first slice lip and extending from said outlet ends of said tubes toward said forming zone in converging relationship to said first slice lip inner surface
- said first slice lip further including a wall extending in spaced parallel relationship to said substantially planar surface and a pair of end walls cooperatively defining a chamber therebetween,
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Abstract
Description
Claims (1)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US8144770A | 1970-10-16 | 1970-10-16 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3734822A true US3734822A (en) | 1973-05-22 |
Family
ID=22164224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US00081447A Expired - Lifetime US3734822A (en) | 1970-10-16 | 1970-10-16 | Headbox for vertical double-wire paper machine |
Country Status (1)
Country | Link |
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US (1) | US3734822A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3972771A (en) * | 1974-02-28 | 1976-08-03 | The Black Clawson Company | Headbox with variable eddy decay length |
US4324820A (en) * | 1980-07-18 | 1982-04-13 | St. Regis Paper Company | Method and apparatus for coating a paper web |
FR2545855A1 (en) * | 1983-05-11 | 1984-11-16 | Ahlstroem Oy | THERMAL STABILIZATION SYSTEM FOR A PULP MACHINE ARRIVAL BOX |
US20070267164A1 (en) * | 2006-02-01 | 2007-11-22 | Astenjohnson, Inc. | Headbox and stock delivery system for a papermaking machine |
CN112301782A (en) * | 2020-09-15 | 2021-02-02 | 山鹰华南纸业有限公司 | Multilayer head box lip heat compensation method |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US25333A (en) * | 1859-09-06 | Amalgamator | ||
US2928464A (en) * | 1957-01-01 | 1960-03-15 | Albert E Reed And Company Ltd | Adjustable slice for flow box |
US3328237A (en) * | 1964-07-23 | 1967-06-27 | Black Clawson Co | Headbox for paper machine |
US3468756A (en) * | 1965-04-08 | 1969-09-23 | Valmet Oy | Paper machine head box support |
US3528882A (en) * | 1964-07-23 | 1970-09-15 | Black Clawson Co | Reinforced headbox for paper machine |
US3578560A (en) * | 1968-02-06 | 1971-05-11 | Black Clawson Co | Headbox for twin wire paper making apparatus |
-
1970
- 1970-10-16 US US00081447A patent/US3734822A/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US25333A (en) * | 1859-09-06 | Amalgamator | ||
US2928464A (en) * | 1957-01-01 | 1960-03-15 | Albert E Reed And Company Ltd | Adjustable slice for flow box |
US3328237A (en) * | 1964-07-23 | 1967-06-27 | Black Clawson Co | Headbox for paper machine |
US3528882A (en) * | 1964-07-23 | 1970-09-15 | Black Clawson Co | Reinforced headbox for paper machine |
US3468756A (en) * | 1965-04-08 | 1969-09-23 | Valmet Oy | Paper machine head box support |
US3578560A (en) * | 1968-02-06 | 1971-05-11 | Black Clawson Co | Headbox for twin wire paper making apparatus |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3972771A (en) * | 1974-02-28 | 1976-08-03 | The Black Clawson Company | Headbox with variable eddy decay length |
US4324820A (en) * | 1980-07-18 | 1982-04-13 | St. Regis Paper Company | Method and apparatus for coating a paper web |
FR2545855A1 (en) * | 1983-05-11 | 1984-11-16 | Ahlstroem Oy | THERMAL STABILIZATION SYSTEM FOR A PULP MACHINE ARRIVAL BOX |
US20070267164A1 (en) * | 2006-02-01 | 2007-11-22 | Astenjohnson, Inc. | Headbox and stock delivery system for a papermaking machine |
US7578906B2 (en) | 2006-02-01 | 2009-08-25 | Astenjohnson, Inc. | Headbox and stock delivery system for a papermaking machine |
CN112301782A (en) * | 2020-09-15 | 2021-02-02 | 山鹰华南纸业有限公司 | Multilayer head box lip heat compensation method |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: WALTER E. HELLER & COMPANY, INC., 101 PARK AVE., N Free format text: SECURITY INTEREST;ASSIGNOR:BLACK CLAWSON COMPANY, THE;REEL/FRAME:004250/0792 Effective date: 19840130 |
|
AS | Assignment |
Owner name: BLACK CLAWSON COMPANY THE Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:HELLER FINANCIAL, INC. F/K/A/ WALTER E. HELLER & COMPANY INC.;REEL/FRAME:004628/0875 Effective date: 19861015 |
|
AS | Assignment |
Owner name: CHEMICAL BANK, AS AGENT Free format text: SECURITY INTEREST;ASSIGNORS:BLACK CLAWSON COMPANY, THE, AN OH CORP.;HYDROTILE MACHINERY COMPANY, ANIOWA CORPORATION;REEL/FRAME:004930/0102 Effective date: 19880601 |
|
AS | Assignment |
Owner name: BANK ONE, DAYTON, NATIONAL ASSOCIATION Free format text: SECURITY INTEREST;ASSIGNOR:CHEMICAL BANK;REEL/FRAME:005319/0279 Effective date: 19900208 |
|
AS | Assignment |
Owner name: BLACK CLAWSON COMPANY, NEW YORK Free format text: RELEASED BY SECURED PARTY;ASSIGNORS:BANK ONE, DAYTON, NATIONAL ASSOCIATION;CENTRAL TRUST COMPANY, N.A.;DNC AMERICA BANKING CORPORATION;REEL/FRAME:006414/0133 Effective date: 19921116 Owner name: HYDROTILE MACHINERY COMPANY (NOW KNOWN AS BC MANUF Free format text: RELEASED BY SECURED PARTY;ASSIGNORS:BANK ONE, DAYTON, NATIONAL ASSOCIATION;CENTRAL TRUST COMPANY, N.A.;DNC AMERICA BANKING CORPORATION;REEL/FRAME:006414/0133 Effective date: 19921116 |