EP0723613B1 - Appareil de formage d'une bande a partir de pate a papier - Google Patents

Appareil de formage d'une bande a partir de pate a papier Download PDF

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Publication number
EP0723613B1
EP0723613B1 EP94927335A EP94927335A EP0723613B1 EP 0723613 B1 EP0723613 B1 EP 0723613B1 EP 94927335 A EP94927335 A EP 94927335A EP 94927335 A EP94927335 A EP 94927335A EP 0723613 B1 EP0723613 B1 EP 0723613B1
Authority
EP
European Patent Office
Prior art keywords
forming
wire
stock
curved
relative
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
EP94927335A
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German (de)
English (en)
Other versions
EP0723613A1 (fr
Inventor
James Arthur Turner
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 Technologies Inc
Original Assignee
Beloit Technologies Inc
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Filing date
Publication date
Application filed by Beloit Technologies Inc filed Critical Beloit Technologies Inc
Publication of EP0723613A1 publication Critical patent/EP0723613A1/fr
Application granted granted Critical
Publication of EP0723613B1 publication Critical patent/EP0723613B1/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
    • 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
    • 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

Definitions

  • the present invention relates to a forming apparatus for forming a web from stock. More particularly, the present apparatus relates to a twin-wire forming apparatus.
  • Twin wire formers such as the BEL BOND® former, have greatly increased the quality of the web formed thereby.
  • BEL BOND is a registered trademark of Beloit Corporation.
  • the aforementioned BEL BOND® former was designed typically as a retrofit top wire unit which permitted upward removal of water from the partially dewatered web. Such upward removal of water is attained by means of an auto-slice or vacuum slot disposed within the loop of the upper forming wire.
  • WO-A-89 04397 describes a forming apparatus which includes pressure chambers and a band within the lower wire loop for aiding in dewatering the web suspension upwardly.
  • EP-A-0 389 404 describes a multi-ply paper forming apparatus which includes a curved inverted vacuum box in the upper wire loop to permit upward removal of water from the web.
  • a curved inverted vacuum box is also disposed in the upper wire loop, the arrangement being such that suction and pressure is applied to the fibrous suspension for dewatering it.
  • the present invention overcomes the aforementioned problem by the provision of a movable blanket disposed beneath a curved inverted vacuum box for pressing the wires against a curved face of the aforementioned curved inverted vacuum box for gently removing therefrom further quantities of water.
  • Another object of the present invention is the provision of a twin-wire forming apparatus which includes a looped blanket which cooperates with a fourdrinier wire for urging the fourdrinier wire against a curved face of a curved inverted vacuum box for removing water from stock disposed between the wires moving between the blanket and the curved face.
  • the forming apparatus of the invention comprises the features claimed in the characterizing part of claim 1.
  • the present invention relates to a forming apparatus for forming a web from stock ejected from a headbox.
  • the apparatus includes a fourdrinier wire which defines a substantially horizontal section having a first and a second end.
  • a headbox is disposed adjacent to and above the first end of the section for ejecting the stock onto the fourdrinier wire between the first and the second end of the section.
  • a looped forming wire cooperates with and is disposed above the horizontal section such that the fourdrinier wire and the forming wire define therebetween an elongate forming section for removing water from the stock.
  • the forming section has an upstream and a downstream end.
  • a curved forming shoe is disposed adjacent to the upstream end of the forming section and on an opposite side of the fourdrinier wire relative to the headbox.
  • the arrangement is such that during movement of the fourdrinier wire over the curved shoe, water is thrown centrifugally from the stock upwardly through the forming wire.
  • a vacuum slot is disposed on an opposite side of the wires relative to the shoe for conveying the water removed centrifugally through the forming wire.
  • a curved inverted vacuum box is disposed immediately downstream relative to the vacuum slot and on the same side of the wires as the vacuum slot.
  • the curved vacuum box defines a curved face for guiding the wires.
  • the curved face is curved in an opposite sense relative to the curved forming shoe.
  • a looped blanket means is disposed on the same side of the wires as the shoe.
  • the blanket means is disposed adjacent to and on the opposite side of the wires relative to the curved face.
  • the blanket means cooperates with the fourdrinier wire for pressing the fourdrinier wire against the curved face for urging a further portion of water away from the formed web upwardly through the forming wire.
  • the fourdrinier wire defines an upstream section immediately ahead of the horizontal section.
  • the horizontal section is dipped relative to the upstream section such that the ejection of stock onto the horizontal section is at a relatively small angle relative to the horizontal section for minimizing bouncing of the stock on the horizontal section.
  • the stock is ejected onto the horizontal section upstream relative to the curved shoe.
  • the upstream end of the forming section includes means for adjusting a wrap of the forming wire around the curved shoe for adjusting the flow of water through the forming wire.
  • the forming shoe includes a plurality of blades, with each blade extending in a cross-machine direction.
  • the blades are spaced relative to each other in a machine direction.
  • the vacuum slot includes an adjustable guide for guiding the water removed centrifugally from the stock through the forming wire.
  • the slot is connected to a source of partial vacuum for assisting removal of the water.
  • the curved face includes a plurality of foils, with each foil extending in a cross-machine direction.
  • the foils are spaced relative to each other in a machine direction for guiding the forming wire.
  • the curved face includes a first zone and a second zone disposed downstream relative to the first zone.
  • the second zone has a radius of curvature which is less than the radius of curvature of the first zone.
  • the second zone is disposed immediately downstream relative to the first zone, with the second zone having a downstream extremity.
  • the downstream extremity, the second end of the horizontal section and the downstream end of the forming section are all disposed adjacent to each other.
  • the blanket means in one embodiment of the present invention is a non-porous blanket which defines a smooth surface which cooperates with the fourdrinier wire.
  • the blanket means is a vented blanket for assisting removal of water pressed from the stock during movement of the stock between the wires between the blanket means and the curved face.
  • the forming apparatus also includes stretching means for stretching the blanket means such that the blanket means is urged upwardly against the fourdrinier wire.
  • FIG. 1 is a side-elevational view of a forming apparatus, generally designated 10 according to the present invention, for forming a web W from stock S ejected from a headbox 12 .
  • the apparatus 10 includes a fourdrinier wire 14 defining a substantially horizontal section 16 having a first and a second end 18 and 20 , respectively.
  • the headbox 12 is disposed adjacent to and above the first end 18 of the section 16 for ejecting the stock S onto the fourdrinier wire 14 between the first and the second end 18 and 20 of the section 16 .
  • a looped forming wire 22 cooperates with and is disposed above the horizontal section 16 such that the fourdrinier wire 14 and the forming wire 22 define therebetween an elongate forming section 24 for removing water from the stock S .
  • the forming section 24 has an upstream and a downstream end 26 and 28 , respectively.
  • a curved forming shoe 30 is disposed adjacent to the upstream end 26 of the forming section 24 and on an opposite side of the fourdrinier wire 14 relative to the headbox 12 .
  • the arrangement is such that during movement of the fourdrinier wire 14 over the curved shoe 30 , water, as indicated by the arrow 32 , is thrown centrifugally from the stock S through the forming wire 22 .
  • a vacuum slot 34 is disposed on an opposite side of the wires 14 and 22 relative to the shoe 30 for conveying the water 32 removed centrifugally through the forming wire 22 .
  • a curved inverted vacuum box 36 is disposed immediately downstream relative to the vacuum slot 34 and on the same side of the wires 14 and 22 as the vacuum slot 34 .
  • the curved vacuum box 36 defines a curved face 38 for guiding the wires 14 and 22 .
  • the curved face 38 has a curvature in an opposite sense relative to the curved forming shoe 30 .
  • a looped blanket means 40 is disposed on the same side of the wires 14 and 22 as the shoe 30 .
  • the blanket means 40 is disposed adjacent to and on the opposite side of the wires 14 and 22 relative to the curved face 38 .
  • the blanket means 40 cooperates with the fourdrinier wire 14 for pressing the fourdrinier wire 14 against the curved face 38 for urging a further portion of water, as indicated by the arrow 42 , away from the formed web W and through the forming wire 22 .
  • the fourdrinier wire 14 also defines an upstream section 44 immediately ahead of the horizontal section 16 .
  • the horizontal section 16 is dipped relative to the upstream section 44 such that when the stock S is ejected onto the horizontal section 16 , the trajectory of the stock is at a relatively small angle relative to the horizontal section 16 .
  • bouncing of the stock S on the horizontal section 16 is minimized, and the stock S is ejected onto the horizontal section 16 upstream relative to the curved shoe 30 .
  • the upstream end 26 of the forming section 24 also includes means 46 for adjusting a wrap of the forming wire 22 around the curved shoe 30 for adjusting the flow of water 32 through the forming wire 22 .
  • the forming shoe 30 also includes a plurality of blades 48,49 and 50 .
  • Each blade for example blade 48 , extends in a cross-machine direction.
  • the blades 48 to 50 are spaced relative to each other in a machine direction MD .
  • the vacuum slot 34 includes an adjustable guide 52 for guiding the water 32 removed centrifugally from the stock S through the forming wire 22 .
  • the slot 34 is connected to a source of partial vacuum for assisting removal of the water 32 .
  • the curved face 38 includes a plurality of foils 54,55 and 56 .
  • Each of the foils 54 to 56 extends in a cross-machine direction.
  • the foils 54 to 56 are spaced relative to each other in a machine direction MD for guiding the forming wire 22 .
  • the curved face 38 includes a first zone 58 and a second zone 60 which is disposed downstream relative to the first zone 58 .
  • the second zone 60 has a radius of curvature which is less than a radius of curvature of the first zone 58 .
  • the first zone has a radius of curvature of approximately 5 meters.
  • the second zone 60 is disposed immediately downstream relative to the first zone 58 .
  • the second zone 60 has a downstream extremity 62 .
  • the downstream extremity 62 and the downstream end 28 of the forming section 24 are disposed adjacent to each other.
  • the blanket means 40 is a non-porous blanket 64 which defines a smooth surface 66 which cooperates with the fourdrinier wire 14 .
  • a blanket means 40A is a vented blanket 64A for assisting removal of water pressed from the stock S during movement of the stock S between the wires 14 and 22 between the blanket means 40A and the curved face 38 .
  • the vented blanket 64A is a grooved blanket with grooves 66 and 67 .
  • the forming apparatus 10 further includes stretching means 68 for stretching the blanket means 40 such that the blanket means 40 is urged upwardly, as indicated by the arrow 70 , against the fourdrinier wire 14 .
  • stock is ejected from the headbox 12 onto the fourdrinier wire.
  • the stock is conveyed by the fourdrinier wire 14 such that the partially formed web is disposed between the wires 14 and 22 .
  • Water is removed upwardly through the wire 22 and downwardly through the shoe 30 during movement thereof past the curved shoe.
  • the present invention permits drainage of water from board grades manufactured particularly from waste furnish by the provision of a gentle pressing of the water from the formed web during the forming operation.

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  • Paper (AREA)

Claims (11)

  1. Appareil de fabrication (10) pour fabriquer une bande (W) à partir d'une pâte de papier (S) éjectée d'un caisson de tête (12), ledit appareil comprenant:
    une toile plate (14) définissant une section essentiellement horizontale (16) comportant des première et seconde extrémités (18, 20),
    un caisson de tête (12) disposé en position adjacente à et au-dessus de ladite première extrémité (18) de ladite section (16) pour éjecter la pâte de papier (S) sur ladite toile plate (14) entre lesdites première et seconde extrémités (18, 20) de ladite section (16),
    une toile de fabrication en boucle (22) coopérant avec et disposée par-dessus ladite section essentiellement horizontale (16) de telle sorte que ladite toile plate (14) et ladite toile de fabrication (22) définissent entre elles une section de fabrication allongée (24) pour éliminer de l'eau de la pâte de papier (S), ladite section de fabrication (24) possédant des extrémités amont et aval (26, 28),
    un sabot de fabrication (30) de forme arquée disposé en position adjacente à ladite extrémité amont (26) de ladite section de fabrication (24) et sur le côté de ladite toile plate (14) opposé à celui où se trouve ledit caisson de tête (12), l'arrangement étant tel qu'au cours du mouvement de ladite toile plate (14) par-dessus ledit sabot (30) de forme arquée, de l'eau (32) est éjectée par centrifugation depuis la pâte de papier (S) à travers ladite toile de fabrication en boucle (22),
    une fente à vide (34) disposée sur le côté desdites toiles (14, 22) opposé à celui où se trouve ledit sabot (30) pour transporter ladite eau (32) éliminée par centrifugation à travers ladite toile de fabrication en boucle (22),
    un caisson à vide renversé de forme arquée (36) disposé immédiatement en aval par rapport à ladite fente à vide (34) et sur le même côté desdites toiles (14, 22) que celui où se trouve ladite fente à vide (34), ledit caisson à vide (36) étant disposé à l'intérieur de ladite toile de fabrication en boucle (22),
    ledit caisson à vide (36) de forme arquée définissant une face courbe (38) pour guider lesdites toiles (14, 22), ladite face courbe venant se mettre en contact avec ladite toile de fabrication (22) et supportant par glissement ladite toile de fabrication, le sens de courbure de ladite face courbe (38) étant opposé à celui de la courbure du sabot de fabrication (30) de forme arquée,
       caractérisé en ce qu'il comprend en outre un moyen de blanchet en boucle (40) disposé du même côté desdites toiles (14, 22) que celui où se trouve ledit sabot (30), ledit moyen de blanchet (40) étant disposé en position adjacente auxdites toiles (14, 22) et sur le côté desdites toiles (14, 22) opposé à celui où se trouve ladite face courbe (38), et
       des moyens d'étirage (68) pour étirer ledit moyen de blanchet (40) de telle sorte que ledit moyen de blanchet (40) est pressé vers le haut (70) contre ladite toile plate (14), par lesquels ledit moyen de blanchet (40) coopère avec ladite toile plate (14) pour presser ladite toile plate (14) vers le haut en direction de ladite face courbe (38) dans le but d'éliminer par pression une portion supplémentaire d'eau (42) de la bande fabriquée (W) et à travers ladite toile de fabrication (22).
  2. Appareil de fabrication selon la revendication 1, caractérisé en ce que ladite toile plate (14) définit une section amont (44) disposée immédiatement devant ladite section essentiellement horizontale (16), ladite section essentiellement horizontale (16) étant inclinée par rapport à ladite section amont (44) de telle sorte que ladite éjection de pâte de papier (S) sur ladite section essentiellement horizontale (16) s'effectue en formant un angle relativement petit par rapport à ladite section essentiellement horizontale (16) pour minimiser le rebondissement de la pâte de papier (S) sur ladite section essentiellement horizontale (16), ladite pâte de papier (S) étant éjectée sur ladite section essentiellement horizontale (16) en amont par rapport audit sabot (30) de forme arquée.
  3. Appareil de fabrication selon la revendication 1, caractérisé en ce que ladite extrémité amont de ladite section de fabrication (24) englobe:
       des moyens (46) pour régler le serrage de ladite toile de fabrication (22) autour dudit sabot (30) de forme arquée dans le but de régler l'écoulement, d'eau (32) à travers ladite toile de fabrication (22).
  4. Appareil de fabrication selon la revendication 1, caractérisé en ce que ledit sabot de fabrication (30) englobe:
       plusieurs lames (48, 49, 50), chaque lame s'étendant en direction transversale, lesdites lames (48, 49, 50) étant espacées l'une de l'autre dans la direction machine (MD).
  5. Appareil de fabrication selon la revendication 1, caractérisé en ce que ladite fente à vide (34) englobe:
       un guide réglable (52) pour guider ladite eau (32) éliminée par centrifugation de la pâte de papier (S) à travers ladite toile de fabrication (22), ladite fente (34) étant reliée à une source de vide partiel pour faciliter l'élimination de ladite eau (32).
  6. Appareil de fabrication selon la revendication 1, caractérisé en ce que ladite face courbe (38) englobe:
       plusieurs racles d'égouttage (54, 55, 56), chaque racle d'égouttage (54, 55, 56) s'étendant en direction transversale, lesdites racles d'égouttage (54, 55, 56) étant espacées l'une de l'autre dans le sens machine (MD) pour guider ladite toile de fabrication (22).
  7. Appareil de fabrication selon la revendication 1, caractérisé en ce que ladite face courbe (38) englobe:
    une première zone (58);
    une seconde zone (60) disposée en aval par rapport à ladite première zone (58), ladite seconde zone (60) possédant un rayon de courbure qui est inférieur au rayon de courbure de ladite première zone (58).
  8. Appareil de fabrication selon la revendication 7, caractérisé en ce que ladite seconde zone (60) est disposée immédiatement en aval par rapport à ladite première zone (58), ladite seconde zone (60) possédant une extrémité aval (62).
  9. Appareil de fabrication selon la revendication 8, caractérisé en ce que ladite extrémité aval (62), ladite seconde extrémité (20) de ladite section (16) essentiellement horizontale et ladite extrémité aval (28) de ladite section de fabrication (24) sont disposées en position adjacente l'une de l'autre.
  10. Appareil de fabrication selon la revendication 1, caractérisé en ce que ledit moyen de blanchet (40) est un blanchet non poreux (64) qui définit une surface lisse (66) qui coopère avec ladite toile plate (14).
  11. Appareil de fabrication selon la revendication 1, caractérisé en ce que ledit moyen de blanchet (40A) est un blanchet rainuré (64A) pour faciliter l'élimination de l'eau par pression à partir de la pâte de papier (S) au cours du mouvement de la pâte de papier (S) entre lesdites toiles (14, 22), entre ledit moyen de blanchet (40A) et ladite face courbe (38).
EP94927335A 1993-10-16 1994-08-31 Appareil de formage d'une bande a partir de pate a papier Expired - Lifetime EP0723613B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB939321401A GB9321401D0 (en) 1993-10-16 1993-10-16 A forming apparatus for forming a web from stock
GB9321401 1993-10-16
PCT/US1994/009974 WO1995011338A1 (fr) 1993-10-16 1994-08-31 Appareil de formage d'une bande a partir de pate a papier

Publications (2)

Publication Number Publication Date
EP0723613A1 EP0723613A1 (fr) 1996-07-31
EP0723613B1 true EP0723613B1 (fr) 1998-12-16

Family

ID=10743685

Family Applications (1)

Application Number Title Priority Date Filing Date
EP94927335A Expired - Lifetime EP0723613B1 (fr) 1993-10-16 1994-08-31 Appareil de formage d'une bande a partir de pate a papier

Country Status (11)

Country Link
EP (1) EP0723613B1 (fr)
JP (1) JP2686853B2 (fr)
KR (1) KR960705108A (fr)
CN (1) CN1039931C (fr)
BR (1) BR9407827A (fr)
CA (1) CA2174228A1 (fr)
DE (1) DE69415338T2 (fr)
FI (1) FI961654A (fr)
GB (1) GB9321401D0 (fr)
PL (1) PL313915A1 (fr)
WO (1) WO1995011338A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI116688B (fi) * 2004-02-13 2006-01-31 Metso Paper Inc Monikerrosrainan muodostusosa
CN101522987B (zh) * 2006-02-03 2012-11-28 路易斯·费尔南多·卡布雷拉Y洛佩斯卡拉姆 保持纸张成形所需流体动力学过程的纤维毡成形装置和方法
CN103669087A (zh) * 2012-09-10 2014-03-26 国能纸业有限公司 长网多缸造纸机网部重力脱水系统上的成形板
CN108350657B (zh) * 2015-11-12 2019-11-08 维美德股份公司 用在造纸机中的抽吸装置以及使用抽吸装置的造纸机

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991013206A1 (fr) * 1990-02-23 1991-09-05 Beloit Corporation Procede de fabrication d'une bande de papier

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8307435D0 (en) * 1983-03-17 1983-04-27 Beloit Walmsley Ltd Dewatering apparatus
DE3830683A1 (de) * 1987-10-30 1989-05-11 Escher Wyss Gmbh Doppelsiebformer
FI885606A (fi) * 1988-12-01 1990-06-02 Ahlstroem Valmet Banformningsfoerfarande och anordning.
GB8906275D0 (en) * 1989-03-18 1989-05-04 Beloit Corp Web former
DE4212609A1 (de) * 1991-12-17 1993-10-28 Voith Gmbh J M Doppelsiebformer

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1991013206A1 (fr) * 1990-02-23 1991-09-05 Beloit Corporation Procede de fabrication d'une bande de papier

Also Published As

Publication number Publication date
EP0723613A1 (fr) 1996-07-31
DE69415338D1 (de) 1999-01-28
CA2174228A1 (fr) 1995-04-27
GB9321401D0 (en) 1993-12-08
DE69415338T2 (de) 1999-07-15
JP2686853B2 (ja) 1997-12-08
PL313915A1 (en) 1996-08-05
BR9407827A (pt) 1997-05-06
FI961654A0 (fi) 1996-04-15
FI961654A (fi) 1996-04-15
CN1039931C (zh) 1998-09-23
KR960705108A (ko) 1996-10-09
WO1995011338A1 (fr) 1995-04-27
CN1133077A (zh) 1996-10-09
JPH08512367A (ja) 1996-12-24

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