EP0454973B1 - Dispositif de caisse aspirante avec éléments de couverture composites montés en coupures à traverses - Google Patents

Dispositif de caisse aspirante avec éléments de couverture composites montés en coupures à traverses Download PDF

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Publication number
EP0454973B1
EP0454973B1 EP91103732A EP91103732A EP0454973B1 EP 0454973 B1 EP0454973 B1 EP 0454973B1 EP 91103732 A EP91103732 A EP 91103732A EP 91103732 A EP91103732 A EP 91103732A EP 0454973 B1 EP0454973 B1 EP 0454973B1
Authority
EP
European Patent Office
Prior art keywords
support members
suction box
conveyor belt
papermaking machine
braces
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
EP91103732A
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German (de)
English (en)
Other versions
EP0454973A1 (fr
Inventor
Holt W. Simmons
Martin P. Franck
Danial L. Perry
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.)
Wilbanks International Inc
Original Assignee
Wilbanks International 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 Wilbanks International Inc filed Critical Wilbanks International Inc
Publication of EP0454973A1 publication Critical patent/EP0454973A1/fr
Application granted granted Critical
Publication of EP0454973B1 publication Critical patent/EP0454973B1/fr
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
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • D21F1/52—Suction boxes without rolls
    • 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
    • D21F1/52—Suction boxes without rolls
    • D21F1/523—Covers thereof

Definitions

  • the subject matter of the present invention relates generally to dewatering apparatus for papermaking machines and in particular to suction box apparatus, including a composite suction box cover having cover elements mounted in slots on cross braces.
  • the cross braces which may be of metal extend across such cover elements and longitudinally of the porous conveyor belt conveying the paper web from which water is to be removed by the suction box or other dewatering apparatus.
  • the composite suction box cover is preferably formed by cover strips of ceramic material bonded to fiber-reinforced plastic support members extending beneath such ceramic strips.
  • the support members are provided with mounting projections which engage mounting slots in the cross braces for releasably mounting such cover strips on such cross braces without the use of threaded fasteners such as screws or bolts and without the need for welding or other time-consuming and expensive fastening means.
  • the drainage apparatus of the present invention is especially useful in the manufacture of paper, pulp stock and nonwoven fabrics for the removal of water from the material being manufactured.
  • a suction box cover apparatus embodying the present invention avoids the need for welding or threaded fasteners by using metal cross braces which are slotted with mounting slots to engage mounting projections on the bottom of support members of fiber-reinforced plastic material to which the cover strips of ceramic material are bonded. This overcomes the above-mentioned problems and has the added advantage that allows the cover elements to be easily inserted and removed in the case of damage or replacement of the cover elements for other reasons.
  • the cross braces are made in a simple and inexpensive manner by machining metal bar stock rather than requiring the bracing to be made by casting, and thereby allows a greater flexibility in the design of the suction box cover to accommodate changes in the width of the cover elements and the drainage slot spacing between elements which varies, depending upon many factors, including the position of the suction box in the papermaking machine and the vacuum pressure within such suction box.
  • DE 3823882 discloses a suction box having cross braces to which are fixedly attached, by bonding with epoxy resin bonding material, rectangular cross-section support members.
  • this extremely complicated device differs from that of the present invention in that it employs bolts to fasten the T-bar brackets which can loosen and fall out to damage the conveyor wire and does not provide slotted cross braces having mounting slots in which the cover elements are secured by mounting projections on the bottom of such cover elements.
  • Suction box covers have previously been provided with metal cross braces as shown in U.S. Patent No. 1,657,509 of Latham, issued January 31, 1928, and U.S. Patent No. 1,696,917 of Lewis, issued January 1, 1929;, which show cover elements of wood attached to metal bars supported on cross braces or bridge members.
  • U.S. Patent No. 3,708,390 of Krake, issued January 2, 1973 discloses a felt dewatering apparatus, including a suction box employing plastic cover elements attached to J-shaped metal supports supported on a metal plate.
  • metal cross braces have not been employed to mount suction box cover elements directly thereon by means of mounting slots provided in such cross braces in the manner of the present invention.
  • the invention provides a papermaking machine having a paper-forming section including a suction box apparatus which comprises:
  • the present invention enables the provision of an improved suction box of simple and economical construction.
  • cover strips of ceramic material may be attached to support members of fiber-reinforced plastic material provided with mounting projections on the bottom thereof for insertion in the mounting slots provided on the cross braces in order to provide a suction box cover which is lightweight and of great strength so it can span a wider paper sheet and operate at a higher vacuum pressure while also being highly wear-resistant.
  • Embodiments of the invention provide a papermaking machine having a suction box apparatus of simple and inexpensive construction, employing slotted cross braces with mounting slots therein for mounting the suction box cover elements thereon without employing bolts, screws or other mechanical fasteners or welding, thereby reducing the danger of damage to the porous conveyor belt by falling fasteners, which is less costly to manufacture and is more versatile apparatus whose cover elements and drainage slots can be changed in width to accommodate different dewatering conditions.
  • the slotted cross braces may be provided with mounting slots of dovetail or T-shape that hold the cover elements in a fixed position to prevent vertical movement toward or way from the conveyor belt but which allow sliding movement horizontally for insertion and removal of the cover elements in the mounting slots.
  • the cross braces may be provided with tapered top portions facing the conveyor belt to improve the water flow during dewatering.
  • one embodiment of the drainage apparatus of the present invention is a suction box apparatus 10, including a suction box connected to an external source of vacuum pressure (not shown) in a conventional manner and a suction box cover 12.
  • the suction box cover is formed by spaced cover elements 14 which may be composite structures extending across the width of a porous conveyor belt 16.
  • the conveyor belt may be metal wire or woven plastic fabric and is motor driven at high speed up to 1067 metres per minute (3,500 feet per minute) to convey a paper web 18 across such suction box cover for removing water from such paper web.
  • the suction box cover elements 14 are spaced apart by drainage slots 20 which extend across the width of the conveyor belt 16 to allow water which is drawn from the paper web 18 through the conveyor belt 16 by the vacuum pressure within the suction box to drain through slots 20 into the suction box.
  • the suction box has an external vacuum pressure source connected thereto, which reduces the pressure within the suction box below atmospheric pressure of, for example, about 33.86 to 67.72 kPa (10 to 20 inches of mercury pressure).
  • the suction box cover elements 14 may be composite structures formed by cover strips 22 of ceramic material such as aluminum oxide or zirconium oxide ceramic, which extend across the full width of the paper web 18 and whose upper surface contacts conveyor belt 16.
  • the ceramic cover strips 22 are fixed to support members 24 of fiber-reinforced plastic material such as fiberglass-reinforced polyester.
  • the ceramic cover strips 22 are each formed of a plurality of segments mounted end to end and provided with a tongue portion 26 which extends downwardly away from the conveyor belt 16 into a mating groove 28 in the top of the support member 24.
  • Adhesive bonding material such as epoxy resin is provided at the interface between the tongue projection 26 and the groove 28 in order to bond the ceramic strips 22 to the fiberglass-reinforced plastic support members 24.
  • the central support members 24 between the two outer support members 24A and 24B are each provided with a mounting projection 30 on the bottom thereof which is of a configuration to mate with mounting slots 32 provided in metal cross braces 34.
  • the cross braces extend across the suction box cover 12 in a direction longitudinally of the conveyor belt 16 which in Fig. 3 moves in a direction right to left indicated by arrow 36.
  • the mounting slots 32 in the cross braces 34 have a dovetail shape and mate with dovetail projections 30 at the bottom of the supporting members 24.
  • a plurality of spaced cross braces 34 are provided beneath the cover elements 14, each of such cross braces being provided with a number of mounting slots 32 which correspond to the number of cover elements 14.
  • the opposite ends of the cross braces 34 are fastened to the outer support members 24A and 24B of the suction box cover, respectively positioned at the trailing and leading ends of the suction box by means of bolts 38 as shown in Fig. 3.
  • the bolts 38 are screwed into threaded holes in the opposite ends of each of the metal cross braces 34 to attach such cross braces so that they each extend across all of the suction box cover elements 14 to support such elements in mounting slots 32 and extend longitudinally of the conveyor belt 16 as shown in Fig. 1.
  • the cross braces 34 are made of stainless steel or other noncorrosive metal and are provided with tapered top portions 40 between each of the mounting slots 32.
  • the tapered top portion 40 tapers from a maximum width at a mid-portion of the cross brace to a pointed ridge 42 at the top of such cross brace, as shown in Fig. 4.
  • This tapered top portion increases the water drainage efficiency through such cross braces for water which is removed from the paper web 18 and passes through the porous conveyor belt 16 into the suction box as a result of the vacuum pressure within the suction box.
  • the slope of the sides of the top portion 40 are approximately 30° with respect to the vertical projection of the sides of such cross brace. As shown in Fig.
  • the suction box cover elements 14 are inserted into and removed from the mounting slots 32 in the cross brace 34 by horizontal sliding movement in the direction of arrow 44 to enable installation or removal of a cover element without the need to remove the conveyor belt from the papermaking machine which would otherwise require stopping the machine. This enables replacement of damaged or worn cover elements or the replacement of cover elements of different size in a simple and inexpensive manner without the need to shut down the papermaking machine.
  • an adjustable deckle device 46 may be provided on the opposite sides of the suction box cover 12 to allow paper webs of different width to be formed thereon.
  • the deckle device includes a deckle seal member 48 of a suitable sealing material such as polyethylene plastic which is notched to fit between the suction box cover elements 14 in order to fill the drainage slots and seal the space between such elements at the end of such slots to provide a vacuum seal with the opposite edges of the paper web 18 as they pass over such deckle members.
  • the deckle members 48 are adjusted in position laterally across the conveyor belt 16 to accommodate paper webs of different width by means of adjustment screws 50 having handles 52 attached to the outer ends of the screw shafts.
  • the adjustment screw shafts pass through drilled passages in two plastic laminate end members 54 and are secured to the deckle seal member 48 by locknuts 56 on the opposite sides of such seal members, as shown in Fig. 2.
  • rotation of the handles 52 causes rotation of the adjustment screw shafts 50 which slides the deckle seal members 48 toward and away from the end member 54 in order to adjust the lateral position of the deckle members.
  • the deckle member 48 slides across a support plate 58 of metal which is fastened by bolts 60 to the bottom of the end member 54 and forms a vacuum seal with such support plate to prevent pressure leaks between the deckle member 48 and the end member 54.
  • the present invention having a suction box cover with an overall length across the conveyor belt of about 7.11 m (280"), twenty-nine of the cross braces 34, each 38.1 mm (1.5") high, 19.05 mm (0.5") wide and 342.9 mm (13.5") long, were provided, equally spaced 203.2 mm (8") apart, with the space between the two deckle members 48 varying between about 6121.4 mm (241") and 6.2484 m (246").
  • the ceramic cover strips 22 were about 15.88 mm (0.625") wide, 11.1 mm (0.437”) high and 6.391 m (251.63") long while the drainage slots 20 between such strips were approximately 19.05 mm (0.750”) wide.
  • suction box cover elements 14 were employed in this cover so that the width of the suction box from the front end support member 24B to the rear end support member 24A was about 371.5 mm (14.625") at the top of the suction box, such end support members being clamped to the body of the suction box in a conventional manner by means of mechanical clamps not shown.
  • the width of the suction box cover elements and the drainage slot spacing between such elements can vary, depending upon the position of the suction box within the papermaking machine and the operating conditions.
  • FIG. 5 and 6 A second embodiment of the suction box apparatus of the present invention is shown in Figs. 5 and 6 which is similar to the embodiment of Figs. 1 and 4 so that the same reference numbers are used to designate similar parts and only the differences will be described and shown.
  • T-shaped mounting slots 62 are provided in the cross braces 34 which are of an inverted T-shaped cross section.
  • a mounting projection 64 of a corresponding T-shaped cross section is provided on the bottom of each of the support members 24' which are bonded to the ceramic cover strips 22 forming the cover elements 14'.
  • the embodiment of Figs. 5 and 6 differs only in the shape of the mounting slots 62 in the cross braces 34 and the shape of the mounting projections 64 on the bottom of the support members 24 for the ceramic strips 22.

Landscapes

  • Paper (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Bridges Or Land Bridges (AREA)

Claims (10)

  1. Une machine de fabrication de papier ayant une section de formation de papier incluant un appareil de caisse aspirante qui comprend :
    une caisse aspirante (10) pour retirer de l'eau d'un papier en continu (18) convoyé sur ladite caisse aspirante (10) par une bande de convoyeur poreuse (16);
    un couvercle de caisse aspirante (12), incluant une pluralité de rubans de couvercle (22) en matière céramique s'étendant en travers de la largeur de la bande de convoyeur (16) et supportés sur la caisse aspirante (10) d'une manière espacée le long de la longueur de la bande de convoyeur (16) afin que ladite bande de convoyeur (16) s'engage sur les rubans de couvercle en céramique (22) et lesdits rubans de couvercle (22) soient séparés par des fentes de drainage (20); et
    un moyen de support pour supporter les rubans de couvercle en céramique (22), le moyen de support incluant des éléments de support (24) en matière non céramique liés aux rubans de couvercle (22) et s'étendant le long des rubans de couvercle (22) en travers de la largeur de la bande de convoyeur (16), le moyen de support incluant une pluralité d'entretoises (34) qui sont espacées latéralement en travers de la bande de convoyeur (16) et s'étendent en travers des éléments de support (24) suivant une direction longitudinale à la bande de convoyeur (16); caractérisée par des fentes de montage (32) dans les entretoises (34) qui reçoivent à coulissement des saillies de montage (30) sur des éléments de support (24) pour former des liaisons interverrouillables libérables entre lesdits éléments de support (24) et lesdites entretoises (34), lesdites liaisons interverrouillables empêchant un déplacement latéral des éléments de support (24) dans lesdites fentes de montage et empêchant un déplacmenet des éléments de support (24) vers ou en s'éloignant de la bande de convoyeur (16) tout en permettant un déplacement à coulissement des éléments de support (24) par rapport auxdites entretoises (34) pour l'insertion des saillies de montage (30) dans les ou le retrait des saillies de montage des fentes de montage (32).
  2. Une machine de fabrication de papier conforme à la revendication 1, dans laquelle les éléments de support (24) sont en matière plastique renforcée de fibres et les entretoises (34) sont en métal.
  3. Une machine de fabrication de papier conforme à la revendication 1 ou 2, dans laquelle les éléments de support (24) contiennent des fibres de verre.
  4. Une machine de fabrication de papier conforme à l'une quelconque revendication précédente, dans laquelle les fentes de montage (32) et les saillies (30) sont en forme de queue d'aronde.
  5. Une machine de fabrication de papier conforme à l'une quelconque revendication précédente, dans laquelle les fentes de montage (32) et les saillies (30) sont en forme de T.
  6. Une machine de fabrication de papier conforme à l'une quelconque revendication précédente, dans laquelle les entretoises (34) ont des portions intermédiaires (40) entre les fentes de montage (32) qui sont effilées vers des arêtes (42) à leurs bords externes s'étendant vers la bande de convoyeur (16).
  7. Une machine de fabrication de papier conforme à l'une quelconque revendication précédente, dans laquelle les rubans de couvercle en céramique (22) incluent des portions de languette (26) qui s'étendent dans des rainures (28) dans les éléments de support (24) et sont collées à ceux-ci.
  8. Une machine de fabrication de papier conforme à la revendication 7, dans laquelle le collage est prévu par une matière de collage adhésive dans lesdites rainures (28).
  9. Une machine de fabrication de papier conforme à l'une quelconque revendication précédente, dans laquelle les entretoises (34) sont liées par des attaches filetées (38) à des supports avant et arrière (24A, B) s'étendant latéralement en travers du convoyeur.
  10. Une machine de fabrication de papier conforme à la revendication 9, dans laquelle les supports avant et arrière (24A, B) sont des éléments de support en matière plastique (24) pour des rubans de couvercle en céramique avant et arrière (22) aux bords avant et arrière de la caisse aspirante (10).
EP91103732A 1990-05-04 1991-03-12 Dispositif de caisse aspirante avec éléments de couverture composites montés en coupures à traverses Expired - Lifetime EP0454973B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US52036990A 1990-05-04 1990-05-04
US520369 1995-08-28

Publications (2)

Publication Number Publication Date
EP0454973A1 EP0454973A1 (fr) 1991-11-06
EP0454973B1 true EP0454973B1 (fr) 1996-05-08

Family

ID=24072305

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91103732A Expired - Lifetime EP0454973B1 (fr) 1990-05-04 1991-03-12 Dispositif de caisse aspirante avec éléments de couverture composites montés en coupures à traverses

Country Status (5)

Country Link
EP (1) EP0454973B1 (fr)
JP (1) JP3065120B2 (fr)
AT (1) ATE137826T1 (fr)
CA (1) CA2036540C (fr)
DE (1) DE69119295T2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013002122A1 (de) * 2013-02-08 2014-08-14 Jörg Scheffler Transportvorrichtung für Papier und Papierbearbeitungseinrichtung

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5630910A (en) * 1995-06-26 1997-05-20 Jwi Ltd. Clip fastener for a dewatering box
AT412657B (de) * 2002-10-17 2005-05-25 Bartelmuss Klaus Ing Vorrichtung für eine mindestens ein siebband aufweisende anlage zur papiererzeugung
AT500751B8 (de) * 2003-02-20 2007-02-15 Bartelmuss Klaus Ing Vorrichtung zur behandlung, insbesondere zur unterdruck-beaufschlagung, des in einer anlage zur papiererzeugung vorgesehenen, im umlauf bewegten mindestens einen siebbandes bzw. filzbandes
AT413392B (de) * 2003-05-28 2006-02-15 Bartelmuss Klaus Ing Abstütz- bzw. abstreifeinrichtung für siebbandanlagen
US7540943B2 (en) 2003-11-17 2009-06-02 Astenjohnson, Inc. Shaped slot vacuum dewatering box cover
AT524317B1 (de) 2021-06-08 2022-05-15 Bartelmuss Ing Klaus Abstreifleiste und Bausatz zur Verwendung in einer Anlage zur Erzeugung einer Papierbahn

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1657509A (en) * 1925-09-16 1928-01-31 Oxford Paper Co Suction box for paper-making machines
US1696917A (en) * 1926-05-20 1929-01-01 Lewis Archelaus Suction-box cover
AT280035B (de) * 1964-02-07 1970-03-25 Feldmuehle Ag Entwässerungsleiste für Papiermaschinen
US3708390A (en) * 1970-09-14 1973-01-02 Kimberly Clark Co Suction box for a papermaking machine having multiple compartments formed by j-shaped elements
GB1559277A (en) * 1975-11-06 1980-01-16 Jwi Ltd Stock formation in a paper making process
FI52131C (fi) * 1976-02-25 1977-06-10 Tampella Oy Ab Vedenpoistolista paperi- tai kartonkikoneen viiraosaa varten.
US4334958A (en) * 1980-08-25 1982-06-15 Fred W. Meyers Production of conveyor support bars for paper making machinery
DE3823882A1 (de) * 1988-07-14 1990-01-18 Feldmuehle Ag Schlitzsauger

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013002122A1 (de) * 2013-02-08 2014-08-14 Jörg Scheffler Transportvorrichtung für Papier und Papierbearbeitungseinrichtung
US9725851B2 (en) 2013-02-08 2017-08-08 Jörg Scheffler Transport device for paper, and paper processing device

Also Published As

Publication number Publication date
DE69119295D1 (de) 1996-06-13
ATE137826T1 (de) 1996-05-15
CA2036540C (fr) 2001-08-21
JPH0617392A (ja) 1994-01-25
EP0454973A1 (fr) 1991-11-06
JP3065120B2 (ja) 2000-07-12
DE69119295T2 (de) 1996-09-12
CA2036540A1 (fr) 1991-11-05

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