EP1315861B1 - Gerillte leitschaufel für eine papiermaschine - Google Patents

Gerillte leitschaufel für eine papiermaschine Download PDF

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Publication number
EP1315861B1
EP1315861B1 EP01973866A EP01973866A EP1315861B1 EP 1315861 B1 EP1315861 B1 EP 1315861B1 EP 01973866 A EP01973866 A EP 01973866A EP 01973866 A EP01973866 A EP 01973866A EP 1315861 B1 EP1315861 B1 EP 1315861B1
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EP
European Patent Office
Prior art keywords
forming fabric
lead blade
trailing edge
lead
blade
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
EP01973866A
Other languages
English (en)
French (fr)
Other versions
EP1315861A1 (de
Inventor
John G. Buchanan
Richard E. Pitt
Roy Van Essen
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.)
AstenJohnson Inc
Original Assignee
ASTENJOHNSON Inc
AstenJohnson Inc
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 ASTENJOHNSON Inc, AstenJohnson Inc filed Critical ASTENJOHNSON Inc
Publication of EP1315861A1 publication Critical patent/EP1315861A1/de
Application granted granted Critical
Publication of EP1315861B1 publication Critical patent/EP1315861B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/02—Complete machines for making continuous webs of paper of the Fourdrinier type
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • This invention concerns a vented lead blade for use in a paper making machine.
  • an unsupported jet of highly aqueous stock is ejected from the head box slice onto the surface of a moving forming fabric.
  • the unsupported jet will typically traverse a distance of from about 6 cm to about 40 cm before impinging the surface of the forming fabric at the point of impingement.
  • the angle of impingement, ⁇ , formed between the stock jet and the plane of the forming fabric at the point of impingement will typically be from about 4° to about 10°. It is well known that improved paper formation can be obtained by minimizing both the angle ⁇ and the length of the unsupported free jet.
  • Typical peak impingement pressures for different values of the angle ⁇ are shown in Table 1.
  • the unsupported stock jet should be made as short as possible to minimize these effects.
  • US 5,160,583 shows a papermaking machine wherein a flexible trailing lip is hinged from one side of the forming zone and is adjusted for profile control by a plurality of rods extending into abutment with the trailing lip.
  • US 5,582,688 discloses a twin wire former for a papermaking machine wherein between where the raw material jet alights on the wires and the couch roll a plurality of dewaterers are mounted.
  • the present invention seeks to provide a lead blade for use in the forming shoe or forming board of a high speed paper making machine which will eliminate or at least substantially reduce the aforementioned deficiencies of the prior art, and, in particular, which will avoid air entrapment at the wedge between the jet and the fabric.
  • the present invention provides a lead blade in accordance with claim 1. Furthermore, the invention suggests use of such a lead blade in a papermaking machine in accordance with claim 9. Preferred embodiments of the invention are laid down in the dependent claims.
  • this invention seeks to provide a vented lead blade for use downstream of the breast roll, between the breast roll and the fabric supporting elements in the forming section, and located so that the stock jet impinges the forming fabric at, or near to, its trailing edge.
  • the vented lead blade does two things. First, it serves to bend the forming fabric before it enters the forming section. Second, it serves to vent at least a substantial proportion of any air which becomes trapped in the wedge shaped space between the surface of the forming fabric and the surface of the stock jet.
  • the vented lead blade of this invention thus enables the forming fabric to be positioned so that the angle ⁇ can be minimized, and, if desired, by allowing the breast roll to be repositioned to create space into which the head box can be moved, thus reducing the unsupported length of the stock jet.
  • the vented lead blade of this invention can be used in both an open surface forming section with one forming fabric, or in the forming zone of a two fabric paper making machine.
  • this invention provides a curved vented lead blade for use in a paper making machine upstream of, and immediately adjacent to, the point of impingement of a stock jet ejected from a head box slice onto a moving forming fabric carrying an amount of liquid, which lead blade has a leading edge, a shaped trailing edge portion, including a trailing edge, and a convexly curved surface located between the leading edge and the trailing edge portion, over which the forming fabric moves in sliding contact and wraps through an angle of wrap ⁇ , the convexly curved surface and the trailing edge portion including a plurality of grooves which begin at the leading edge and end at the trailing edge constructed and arranged to vent at the lead blade trailing edge at least a substantial proportion of any air trapped in the forming fabric from a wedge shaped space between the stock jet and the forming fabric surface, and at least some of the liquid carried by the forming fabric.
  • this invention suggests use of such a vented lead blade in a papermaking machine, having a machine direction and a cross machine direction, which includes:
  • this invention provides use of said vented lead blade together with a further lead blade in a papermaking machine, having a machine direction and a cross machine direction, which includes:
  • the convexly curved surface is essentially circular, with a constant radius. More preferably, the shaped trailing edge portion conforms to the convexly curved surface. Alternatively, the convexly curved surface is not circular, and the radius of curvature increases towards the trailing edge. Conveniently, the convexly curved surface is not circular, the radius of curvature increases towards the trailing edge, and the shaped trailing edge portion is essentially flat.
  • the convexly curved surface has an effective radius of curvature that is from about 50% to about 100% of the radius of the adjacent upstream roll.
  • the radius of curvature will not generally be greater than that of the adjacent upstream roll.
  • the angle ⁇ , ⁇ 1 or ⁇ 2 through which the forming fabric wraps the lead blade is from about 10° to about 40°. More preferably, the angle of wrap is from about 15° to about 30°. Most preferably, the angle of wrap is from about 20° to about 25°.
  • the two vented lead blades are the same, and their convexly curved surfaces are the same shape.
  • the two vented lead blades are not the same, and their convexly curved surfaces are not the same shape.
  • the two vented lead blades are the same, the angles ⁇ 1 and ⁇ 2 are the same, and their convexly curved surfaces are the same shape.
  • the two vented lead blades are not the same, the angles ⁇ 1 and ⁇ 2 are not the same, and their convexly curved surfaces are not the same shape.
  • Figure 1 shows a paper making machine which includes a vented lead blade according to the teachings of this invention.
  • the slice lips 1A and 1B of the head box deliver a jet of stock 2 onto the forming fabric 3 at the impingement point I.
  • the forming fabric 3 passes around the roll 6, wraps the vented lead blade 5, and then passes over the first static support element 4 in the forming section.
  • air 8 in the wedge shaped space between the surface of the stock jet 9, the surface 10 of the head box lip 1B, and the surface of the forming fabric 11 becomes trapped and enters the forming fabric 3.
  • This air together with some of the liquid in the forming fabric at this point, passes through the forming fabric 3 into the grooves 12 in the top surface of the vented lead blade 5.
  • the vented lead blade 5 occupies far less space than the roll, it is possible to maintain the angle of impingement close to zero, and to shorten the unsupported length D of the stock jet 2 significantly. Further, since the trailing edge 14 of the vented lead blade 5 is closely adjacent the impingement point I, the trapped air is prevented from interfering in the formation process within the stock in the forming section.
  • the grooves 12 are located and dimensioned so that at least a substantial proportion, and preferably all, of the air passing through the forming fabric, together with any liquid carried with the air from the liquid on the forming fabric at this point, is vented as at 13 from the vented lead blade at its trailing edge 14.
  • Figures 2 and 3 show a paper making machine which has two forming fabrics, and which incorporates two vented lead blades according to the teachings of this invention.
  • the terms "upper” and “lower” refer only to the orientation shown: in practice in a twin fabric machine the forming section is often oriented vertically, or at some angle thereto.
  • the slice lips 1A and 1B deliver a jet of stock 2 onto the lower forming fabric 31 at the impingement point I.
  • the forming fabric 31 wraps the lower vented lead blade 51.
  • air 81 in the wedge shaped space between the surface of the stock jet 91, the surface 101 of the head box lip 1B, and the surface of the forming fabric 111 becomes trapped and enters the forming fabric 31.
  • This air 81 together with some of the liquid in the forming fabric 31 at this point, passes through the forming fabric 31 into the grooves 121 in the lower vented lead blade 51.
  • the accumulated air and liquid 131 is vented from the lower vented lead blade 51 at its trailing edge 141.
  • Figure 3 shows an alternative arrangement to that of Figure 2.
  • the arrangement of the lower forming fabric 31 is the same.
  • the upper forming fabric 32 converges with the stock jet 2 at the same point as the lower forming fabric 31, more or less at the impingement point I.
  • For the upper forming fabric air is now trapped in the space bounded by the upper surface 92 of the stock jet, the lower surface 112 of the upper forming fabric 32, and the upper surface 102 of the head box lip 1A. All of the trapped air, together with some of the liquid in the two forming fabrics, is vented through the grooves 121, 122 at the trailing edges 141, 142 of the two vented lead blades 51, 52.
  • the two vented lead blades will often be the same, and have the same convexly curved shape. However in some circumstances it may be desirable to use two different vented lead blades, which may have different convexly curved shapes. It is also then possible that the two wrap angles ⁇ 1 and ⁇ 2 will likely be similar, they may not be the same.
  • Figures 4, 5 and 6 show the relationship between the angle ⁇ through which the forming fabric 3 wraps about a vented lead blade, the effective radius of curvature of the vented lead blade, and the radius of the adjacent upstream roll.
  • Figures 4, 5 and 6 use the same numbers as Figure 1, and thus considers a single fabric machine. Similar considerations apply to a twin fabric machine.
  • the convexly curved surface 16 of the vented lead blade 5 has a constant radius
  • the forming fabric 3 is received tangentially from the adjacent upstream roll 6, and the impingement point I is adjacent the trailing edge 14 of the vented lead blade 5.
  • the radius R 4 of the vented lead blade surface 16 is the same as the radius R 1 of the roll 6, which is some distance from the head box slice lips 1A, 1B.
  • the vented lead blade 5 then has to be relatively wide in order to bend the forming fabric 3 into the forming path 7. If R 1 and R 4 are both approximately 46 cm, the angle of wrap ⁇ 4 is about 18°. This large radius also implies that the length D 4 of the unsupported stock jet 2 cannot be shortened very much.
  • the radius R 5 of the vented lead blade surface 16 is smaller than the radius R 1 of the roll 6, which is still some distance from the head box slice lips 1A, 1B.
  • the vented lead blade 5 then still has to be relatively wide in order to bend the forming fabric 3 into the forming path 7. If R 1 is approximately 46 cm, and R 5 is approximately 23 cm, the angle of wrap ⁇ 5 is about 36°. This smaller radius R 5 allows the length D 5 of the unsupported stock jet 2 to be shortened.
  • the radius R 6 of the vented lead blade surface 16 is smaller than the radius R 1 of the roll 6, which is now closer to the head box slice lips 1A, 1B.
  • the vented lead blade 5 is much narrower in order to bend the forming fabric 3 into the forming path 7. If R 1 is approximately 46 cm, and R 6 is approximately 23 cm, the angle of wrap ⁇ 6 is about 18°. This smaller radius R 5 allows the length D 6 of the unsupported stock jet 2 to be shortened still further.
  • vented lead blade of this invention provides considerable flexibility in the geometry of the machine wet end.
  • the curved surface of the lead in blade is vented by means of grooves which begin at the extreme upstream edge of the blade and are continuous to its downstream edge.
  • Three groove arrangements are shown in Figures 7, 8 and 9.
  • the forming fabric moves in the direction of the arrow A.
  • the grooves 17 are regularly spaced the same distance apart, and are essentially parallel to the arrow A.
  • the disadvantage with.this arrangement is that there is some risk of the forming fabric tracking across the blade.
  • Figure 8 where although the grooves 18 are still regular and parallel, they are at an angle ⁇ to the arrow A.
  • two sets of angled grooves 18A, 18B can be used as shown in Figure 9. Within each set, the grooves are parallel to each other and regularly spaced, and each set is at an angle ⁇ to the arrow A.
  • the angle ⁇ in Figures 8 and 9 will be from about 2° to about 30°.
  • the purpose of the grooves in the vented lead blade surface is to provide spaces through which at least a substantial proportion of the air is vented which enters the forming fabric from the wedge shaped space essentially between the forming fabric and the jet surface. At the same time, at least some of the liquid in the forming fabric as it enters the forming section will also be vented.
  • Figure 10 shows four possible groove structures for this purpose.
  • the blade surface 17 has been shown flat; in practice it will be curved.
  • Groove 19 is of constant width for its entire length from the leading edge 17A to the trailing edge 17B.
  • the fabric passes over the vented lead blade surface 17, air is continuously entering the forming fabric.
  • a groove with an increasing cross section such as the groove 20 which widens, or the groove 21 which deepens, or the groove 22 which both widens and deepens, in each case from the leading edge 17A to the trailing edge 17B.
  • the grooves 19, 20, 21 and 22 are from 2 - 8 mm in width, and 1 - 8 mm in depth.
  • the forming fabric moves in sliding contact as it wraps the vented lead blade.
  • the fabric may form a small contact angle that is ideally 0.5° or less. It is preferred that the forming fabric is tangential to the vented lead blade surface at this point.
  • the leading edge of the blade can be curved to minimize any frictional effects at this point; a suitable edge radius is from about 0.0025 mm to about 0.0065 mm.
  • the forming fabric should exit the vented lead blade tangentially to the trailing edge portion of the blade surface, substantially in the path defined by the downstream fabric support elements.
  • the downstream path of the forming fabric should be parallel to and in the same plane as the underside of the stock jet, so that the angle of impingement of the stock jet onto the forming fabric is substantially zero.

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Claims (15)

  1. Leitschaufel zur Verwendung in einer Papiermaschine oberhalb einer Auftreffstelle eines Papierstoffstrahls (2), der aus einer Stoffauflaufkasten-Auslaufdüse auf ein laufendes Formiersieb (3; 31) ausgestoßen wird, das eine gewisse Menge Flüssigkeit trägt, wobei die Leitschaufel eine Vorderkante (17a) und einen geformten Endkantenbereich mit einer Endkante (14, 141, 17B) umfasst,
    dadurch gekennzeichnet, dass
    es sich bei der Leitschaufel um eine gekrümmte Leitschaufel mit Entlüftung (5; 51) handelt, die eine zwischen der Vorderkante und dem Hinterkantenbereich (14, 141, 17B) angeordnete konvex gekrümmte Oberfläche zum Bewegen des Formiersiebs (3; 31) in Gleitkontakt über die Leitschaufel in einem Umschlingungswinkel θ aufweist, wobei die konvex gekrümmte Oberfläche und der Hinterkantenbereich (14, 141, 17B) mehrere Rillen (19, 20, 21, 22; 121) umfassen, die an der Vorderkante (17A) beginnen und an der Hinterkante (14; 141; 17B) enden und so konstruiert und angeordnet sind, dass an der Hinterkante (14; 141; 17B) der Leitschaufel zumindest ein wesentlicher Anteil jeglicher im Formiersieb (3; 31) eingeschlossenen Luft aus einem keilförmigen Raum zwischen dem Papierstoffstrahl und der gekrümmten Oberfläche der Leitschaufel und zumindest ein Teil der vom Formiersieb (3; 31) mitgeführten Flüssigkeit abgeführt werden.
  2. Leitschaufel nach Anspruch 1, wobei die konvex gekrümmte Oberfläche im Wesentlichen kreisförmig ist und einen konstanten Radius aufweist.
  3. Leitschaufel nach einem der vorhergehenden Ansprüche, wobei der geformte Hinterkantenbereich entsprechend der konvex gekrümmten Oberfläche ausgeführt ist.
  4. Leitschaufel nach Anspruch 1 oder 3, wobei die konvex gekrümmte Fläche nicht kreisförmig ist und sich der Krümmungsradius in Richtung auf die Hinterkante (14, 141, 142, 17B) vergrößert.
  5. Leitschaufel nach Anspruch 4, wobei der geformte Hinterkantenbereich im Wesentlichen flach ist.
  6. Leitschaufel nach einem der vorhergehenden Ansprüche, wobei der Winkel θ im Bereich zwischen etwa 10° und etwa 40° liegt.
  7. Leitschaufel nach Anspruch 6, wobei der Winkel θ im Bereich zwischen etwa 15° und etwa 30° liegt.
  8. Leitschaufel nach Anspruch 7, wobei der Winkel θ im Bereich zwischen etwa 20° und etwa 25° liegt.
  9. Verwendung einer Leitschaufel (5;- 51) nach einem der vorhergehenden Ansprüche in einer Papiermaschine mit einer Maschinenrichtung und einer Maschinenquerrichtung, umfassend: ein in Maschinenrichtung laufendes Formiersieb (3; 31); einen Stoffauflaufkasten (1A, 1B) mit einer Stoffauflaufkasten-Auslaufdüse, die einen Strahl (2) aus Papierstoff bereitstellt, der in einem Auftreffwinkel an einer Auftreffstelle (I) auf das Formiersieb auftrifft; eine Walze (6) mit einer zylindrischen Oberfläche und einer Achse (15) in Maschinenquerrichtung, über die das Formiersieb (3; 31) läuft und die vor der Stoffauflaufkasten-Auslaufdüse angeordnet ist; einen nach der Auftreffstelle (I) angeordneten Formierabschnitt mit statischen Tragelementen (4), die eine Siebstrecke definieren, entlang der das Formiersieb (3; 31) läuft; wobei die Leitschaufel (5; 51) vor und unmittelbar neben der Auftreffstelle (I) des Papierstoffstrahls (2) auf das laufende Formiersieb (3; 31) angeordnet ist.
  10. Verwendung nach Anspruch 9, wobei die Leitschaufel (51) und eine weitere Leitschaufel (52) in der Papiermaschine verwendet werden, die ferner Folgendes umfasst: eine weiteres, in Maschinenrichtung laufendes Formiersieb (32); eine weitere Walze mit einer zylindrischen Oberfläche und einer Achse in Maschinenquerrichtung, über die das weitere Formiersieb (32) läuft und die neben der Stoffauflaufkasten-Auslaufdüse angeordnet ist; wobei die weitere Leitschaufel (52) vor und unmittelbar neben der Auftreffstelle (I) des Papierstoffstrahls (2) angeordnet ist, wobei das weitere Formiersieb (32) die weitere Leitschaufel (52) in einem Umschlingungswinkel θ2 umschlingt; und wobei die weitere Leitschaufel mit Entlüftung (52) eine Vorderkante (17A), einen geformten Hinterkantenbereich mit einer Hinterkante (142, 17B) und eine zwischen der Vorderkante (17A) und dem Hinterkantenbereich angeordnete, konvex gekrümmte Oberfläche umfasst, über die das Formiersieb (32) in Gleitkontakt läuft und die es im Umschlingungswinkel θ2 umschlingt, wobei die konvex gekrümmte Oberfläche und der Hinterkantenbereich mehrere Rillen (19, 20, 21, 22; 122) umfassen, die an der Vorderkante (17A) beginnen und an der Hinterkante (142, 17B) enden und so konstruiert und angeordnet sind, dass an der Hinterkante (142; 17B) der Leitschaufel zumindest ein wesentlicher Anteil jeglicher im weiteren Formiersieb (32) eingeschlossenen Luft aus einem keilförmigen Raum zwischen dem Papierstoffstrahl und der gekrümmten Oberfläche-der Leitschaufel und zumindest-ein Teil der vom weiteren Formiersieb (32) mitgeführten Flüssigkeit abgeführt werden.
  11. Verwendung nach Anspruch 10, wobei die beiden Leitschaufeln mit Entlüftung (51, 52) identisch sind und ihre konvex gekrümmten Oberflächen die gleiche Form aufweisen.
  12. Verwendung nach Anspruch 10, wobei die beiden Leitschaufeln mit Entlüftung (51, 52) nicht identisch sind und ihre konvex gekrümmten Oberflächen nicht die gleiche Form aufweisen.
  13. Verwendung nach einem der Ansprüche 10 bis 12, wobei die Winkel θ1 und θ2 der beiden Leitschaufeln mit Entlüftung gleich groß sind.
  14. Verwendung nach einem der Ansprüche 10 bis 12, wobei die Winkel θ1 und θ2 der beiden Leitschaufeln mit Entlüftung nicht gleich groß sind.
  15. Verwendung nach einem der Ansprüche 9 bis 14, wobei die konvex gekrümmte Oberfläche des bzw. jeder Leitschaufel (5; 51, 52) einen wirksamen Krümmungsradius aufweist, der im Bereich zwischen etwa 50% und etwa 100% des Radius der angrenzenden, vorgelagerten Walze (6) liegt.
EP01973866A 2000-09-05 2001-09-05 Gerillte leitschaufel für eine papiermaschine Expired - Lifetime EP1315861B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB0021767.9A GB0021767D0 (en) 2000-09-05 2000-09-05 Vented lead blade
GB0021767 2000-09-05
PCT/CA2001/001260 WO2002020899A1 (en) 2000-09-05 2001-09-05 Vented lead blade

Publications (2)

Publication Number Publication Date
EP1315861A1 EP1315861A1 (de) 2003-06-04
EP1315861B1 true EP1315861B1 (de) 2006-11-22

Family

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EP01973866A Expired - Lifetime EP1315861B1 (de) 2000-09-05 2001-09-05 Gerillte leitschaufel für eine papiermaschine

Country Status (7)

Country Link
US (1) US20020046821A1 (de)
EP (1) EP1315861B1 (de)
AU (1) AU2001293532A1 (de)
CA (1) CA2356804C (de)
DE (1) DE60124739T2 (de)
GB (1) GB0021767D0 (de)
WO (1) WO2002020899A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7005040B2 (en) * 2000-09-05 2006-02-28 Astenjohnson, Inc. Fabric support element for a papermaking machine
WO2004081281A1 (en) * 2003-03-10 2004-09-23 Astenjohnson, Inc. Fabric support element for a papermaking machine
DE10332658A1 (de) * 2003-07-18 2005-02-03 Voith Paper Patent Gmbh Siebpartie in einer Maschine zur Herstellung einer Faserstoffbahn
US8529733B2 (en) 2008-10-21 2013-09-10 Astenjohnson, Inc. Twin fabric forming section with multiple drainage shoes
US20120042765A1 (en) 2010-08-20 2012-02-23 Kazda Austin J Reciprocating saw blade

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4802954A (en) * 1986-11-20 1989-02-07 Valmet-Dominion Inc. Forming board for papermaking machine
US5160583A (en) * 1991-12-02 1992-11-03 Beloit Corporation Controlled jet injection apparatus for a papermaking machine headbox
JP3244911B2 (ja) * 1994-01-28 2002-01-07 三菱重工業株式会社 抄紙機のツインワイヤフォーマ

Also Published As

Publication number Publication date
US20020046821A1 (en) 2002-04-25
DE60124739T2 (de) 2007-03-01
AU2001293532A1 (en) 2002-03-22
CA2356804C (en) 2008-03-11
EP1315861A1 (de) 2003-06-04
GB0021767D0 (en) 2000-10-18
WO2002020899A1 (en) 2002-03-14
CA2356804A1 (en) 2002-03-05
DE60124739D1 (de) 2007-01-04

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