EP0656084B1 - A multi-ply web forming apparatus - Google Patents

A multi-ply web forming apparatus Download PDF

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Publication number
EP0656084B1
EP0656084B1 EP92918202A EP92918202A EP0656084B1 EP 0656084 B1 EP0656084 B1 EP 0656084B1 EP 92918202 A EP92918202 A EP 92918202A EP 92918202 A EP92918202 A EP 92918202A EP 0656084 B1 EP0656084 B1 EP 0656084B1
Authority
EP
European Patent Office
Prior art keywords
ply
wire
disposed
dewatering
blades
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
EP92918202A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0656084A1 (en
Inventor
Paul T. Gray
Eric Ormesher
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
Priority claimed from PCT/GB1992/001517 external-priority patent/WO1994004749A1/en
Publication of EP0656084A1 publication Critical patent/EP0656084A1/en
Application granted granted Critical
Publication of EP0656084B1 publication Critical patent/EP0656084B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • the present invention relates to a multi-ply web forming apparatus. More specifically, the present invention relates to a multi-ply web forming apparatus for forming a top ply on a base ply.
  • Bel Bond TM top wire formers permit upward removal of water from stock so that the resultant web has more uniform surface characteristics thereon.
  • the Bel Bond TM unit is a top wire unit which includes a looped top wire which cooperates with the lower fourdrinier wire to define therebetween a forming section.
  • Water is removed upwardly from the stock during passage thereof through the forming section such that more even surface characteristics are imparted to the resultant formed web.
  • a base ply is initially formed on the lower fourdrinier wire, and a secondary headbox is disposed immediately upstream relative to a top wire Bel Bond TM apparatus.
  • EP-A-0 397 430 describes a multi-ply web forming apparatus according to the preamble of claim 1.
  • EP-A-0 397 430 discloses a multi-ply web forming apparatus for forming a top ply on a base ply which includes a secondary headbox depositing stock on a base ply for generating the top ply, and a generally horizontally disposed twin wire forming zone comprising an inverted vacuum box with a plurality of dewatering blades disposed above the top wire and dewatering foils disposed on the opposite side of the wires relative to the dewatering blades.
  • the present invention seeks to overcome the aforementioned problem by removing water evenly from the top ply resulting in a more uniform consistency of stock in a "Z" direction.
  • Another object of the present invention is the provision of a multi-ply web forming apparatus which inhibits crushing of the resultant web, particularly heavy weight webs.
  • the multi-ply web forming apparatus of the invention is characterized by the features claimed in the characterizing portion of claim 1.
  • each foil of the plurality of foils is disposed between adjacent blades of the plurality of dewatering blades such that the blades and foils impart dewatering pressure pulses to the multi-ply web during passage of the web between the blades and foils, thereby maintaining the consistency of the top ply uniform in a "Z" direction so that crushing of the resultant web is inhibited.
  • a turning bar which defines a curved surface is disposed beneath the lower forming wire and upstream relative to the first end of the forming section for guiding the lower wire, the secondary headbox being disposed closely adjacent to the turning bar.
  • the turning bar is adjustable such that positioning of the secondary headbox closely adjacent to the lower wire is permitted so that the stock ejected from the secondary headbox is ejected substantially parallel to the lower wire from the turning bar to the dewatering shoe.
  • the curved surface of the turning bar in one embodiment of the present invention is ceramic.
  • the curved dewatering shoe also includes a plurality of spaced bars which are spaced in a machine direction. Each bar extends in a cross-machine direction, and the bars include an upstream bar.
  • the dewatering shoe also includes a vacuum box in fluid communication with the spaces defined between each adjacent bar.
  • the stock is ejected from the secondary headbox so that such stock impinges on the base ply adjacent to the upstream bar of the plurality of spaced bars.
  • the dewatering shoe has a radius of curvature within the range 12 to 18 meters.
  • the vacuum slot means is an auto-slice which includes a lip means for directing the portion of water ejected from the top ply through the top wire.
  • the auto-slice also includes collecting tank means associated with the lip means for collecting the portion of water therein.
  • the vacuum slot means includes a plurality of vacuum slots which are spaced relative to each other in a machine direction, each vacuum slot including an adjustable lip.
  • the vacuum slot means also includes a collecting tank disposed above each lip, the arrangement being such that in use of the apparatus, water removed from the top ply through the top wire due to tension of the lower wire and a converging wire wedge defined between the wires is removed through the vacuum slot means so that trapping of lower consistency stock within the top ply by the formation of a fiber mat on the opposite side of the top wire relative to the vacuum slot means is inhibited.
  • the inverted vacuum box has a greater radius of curvature than the radius of curvature of the dewatering shoe.
  • Each blade of the plurality of dewatering blades is spaced at a distance relative to an adjacent dewatering blade. The distance is greater than the distance between adjacent bars of the dewatering shoe.
  • Each foil of the plurality of foils is disposed between adjacent blades of the plurality of dewatering blades such that the blades and foils impart dewatering pressure pulses to the multi-ply web during passage of the web between the blades and foils.
  • the foils cooperate with the blades and are disposed between the blades from an upstream blade along a portion of the machine direction length of the vacuum box.
  • the foils cooperate with the blades and are disposed between the blades and downstream relative to an upstream blade to a downstream blade of the vacuum box.
  • Each dewatering foil includes a pair of threaded rods which are disposed parallel and spaced relative to each other and adjacent to one end of the foil.
  • a further pair of threaded rods are disposed spaced and parallel relative to each other adjacent an opposite end of the foil.
  • a yoke portion cooperates with the pair of rods such that vertical adjustment of the yoke relative to the rods is permitted.
  • a further yoke cooperates with the further pair of rods such that vertical adjustment of the further yoke relative to the further rods is permitted.
  • a foil bar having a first and a second end is arranged such that a first end of the foil bar is journalled within the first yoke, and a second end is journalled within the second yoke such that vertical adjustment of the foil bar is permitted.
  • the journals permit rotational adjustment of the foil bar relative to the lower wire.
  • Pneumatic tube means are disposed beneath the foil bar for adjustably loading the foil bar against the lower wire.
  • Figure 1 is a side-elevational view of a multi-ply web forming apparatus, generally designated 10 , for forming a top ply 12 on a base ply 14 .
  • the former 10 includes a lower looped forming wire 16 for receiving the base ply 14 thereon.
  • a top looped forming wire 18 cooperates with and is disposed above the lower wire 16 for defining therebetween a generally horizontally disposed forming section 20 having a first and a second end 22 and 24 , respectively.
  • a turning bar 26 defines a curved surface 28 which is disposed beneath the lower forming wire 16 and upstream relative to the first end 22 of the forming section 20 for guiding the lower wire 16 .
  • a secondary headbox 30 is disposed closely adjacent to the turning bar 26 such that stock 32 ejected from the secondary headbox 30 towards the first end 22 of the forming section 20 is deposited on the base ply 14 , the stock 32 ejected from the secondary headbox 30 generating the top ply 12 .
  • a curved dewatering shoe 34 is disposed beneath the lower wire 16 and adjacent to the first end 22 of the forming section 20 .
  • the curved shoe 34 has a center of curvature disposed below the lower wire 16 such that a portion of water, as indicated by the arrow 36 , is ejected through the top wire 18 .
  • a vacuum slot means is disposed above the top wire 18 and immediately downstream relative to the dewatering shoe 34 for collecting the portion of water 36 upwardly away from the top wire 18 .
  • An inverted vacuum box is disposed immediately downstream relative to the vacuum slot 38 and on the opposite side of the top wire 18 relative to the dewatering shoe 34 .
  • the box 40 defines a curved face 42 having a center of curvature disposed above the top wire 18 .
  • a plurality of dewatering blades 44,45,46,47,48,49,50,51,52,53,54, 55 and 56 are disposed in spaced relationship in a machine direction MD along the curved face 42 .
  • Each blade 44 to 56 extends in a cross-machine direction such that the blades 44 to 56 are disposed between the curved face 42 and the top wire 18 for guiding the top wire therepast.
  • Figure 2 is a side-elevational view of a further arrangement showing a multi-ply web forming apparatus generally designated 10A .
  • the web forming apparatus 10A is essentially identical to the apparatus shown in Figure 1, except in that the forming apparatus shown in Figure 2 further includes a plurality of dewatering foils 58,59,60 and 61 disposed on an opposite side of the wires 16A and 18A relative to the blades 44A to 56A such that the consistency of the stock forming the top ply 12A is increased during passage thereof through the forming section 20A while maintaining the consistency of the top ply 12A uniform in a "Z" direction so that crushing of the resultant web is inhibited.
  • the turning bar 26,26A is adjustable such that positioning of the secondary headbox 30,30A closely adjacent to the lower wire 16,16A is permitted so that the stock 32,32A ejected from the secondary headbox 30,30A is ejected substantially parallel to the lower wire 16,16A from the turning bar 26,26A to the dewatering shoe 34,34A .
  • the curved surface 28,28A of the turning bar 26,26A is fabricated from ceramic material.
  • Figure 3 is a side-elevational view of an embodiment of the present invention.
  • Figure 3 shows a multi-ply web forming apparatus, generally designated 10B , which includes all of the essential features shown in Figure 1.
  • the curved dewatering shoe, generally designated 34B includes a plurality of spaced bars 62,63,64,65, 66,67,68,69,70,71,72,73,74,75,76 and 77 spaced in a machine direction MD .
  • Each bar as for example bar 62 , extends in a cross-machine direction, and the spaced bars 62 to 77 include an upstream bar 62 .
  • the dewatering shoe includes a vacuum box 78 which is in fluid communication with spaces defined between adjacent bars, such as between bars 62 and 63 .
  • the stock 32B ejected from the secondary headbox 30B impinges on the base ply 14B adjacent to the upstream bar 62 of the plurality of spaced bars 62 to 77 .
  • the dewatering shoe 34B has a radius of curvature within the range 12 to 18 meters.
  • FIG 4 is an enlarged view of the vacuum slot means 38 shown in Figure 1.
  • the vacuum slot means 38 includes an auto-slice 80 which includes lip means 82 shown in Figure 4 for directing the portion of water 36' ejected from the top ply 12 through the top wire 18 .
  • the auto-slice 80 also includes collecting tank means 84 associated with the lip means 82 for collecting the portion of water 36' therein.
  • the auto-slice 80 more specifically includes a plurality of slots 86,87,88,89 and 90 which are spaced relative to each other in a machine direction with each slot 86 to 90 including a lip 82, 92, 93,94 and 95 , respectively.
  • Each slot 86 to 90 includes a collecting tank 84,97,98,99 and 100 disposed above an associated lip 82 and 92 to 95 , respectively.
  • the arrangement is such that in use of the apparatus, water 36' removed from the top ply 12 through the top wire 18 due to tension of the lower wire 16 and a converging wire wedge 102 defined between the wires 16 and 18 is removed through the vacuum slot means 38 so that trapping of lower consistency stock within the top ply 12 by the formation of a fiber mat on the opposite side of the top wire 18 relative to the vacuum slot means 38 is inhibited.
  • the inverted vacuum box 40 has a greater radius of curvature than the radius of curvature of the dewatering shoe 34 .
  • Each blade, for example 44B , of the plurality of dewatering blades 44B to 56B is spaced at a distance D relative to an adjacent dewatering blade 45A , as shown in Figure 2.
  • the distance D is greater than the distance d between adjacent bars 62 and 63 of the dewatering shoe 34B shown in Figure 3.
  • each foil of the plurality of foils 58B,59B,60B and 61B is disposed between adjacent blades of the plurality of dewatering blades 44B to 56B such that the blades 44B to 56B and foils 58B to 61B impart dewatering pressure pulses to the multi-ply web during passage of the web between the blades and foils.
  • Figure 5 is a side-elevational view of a preferred embodiment of the present invention which is very similar to the embodiment shown in Figure 3.
  • the foils 58C,59C,60 and 61C cooperate with the blades 44C,45C,46C and 47C and are disposed opposite to the blades 44C to 47C from an upstream blade 44C along a portion of the machine directional length of the vacuum box 40C .
  • the foils 58B to 61B cooperate with the blades 44B to 56B and are disposed opposite to the blades 44B to 56B and downstream relative to an upstream blade 44B to a downstream blade 56B of the vacuum box 40B .
  • the foils 59 to 61 are disposed upstream relative to the dewatering shoe 34A and opposite to the auto-slice 80 .
  • the lips 82 and 92 to 95 are adjusted such that as the top wire 18 extends around lips 82 and 92 to 95 , the radius of curvature of the top wire 18 around the auto-slice 80 is approximately 15 meters.
  • the objective of the present invention is to increase the consistency of the in-coming stock in a uniform manner throughout the slurry, rather than forming a fiber mat on the outside of the Bel Bond TM wire 18 with a lower consistency beneath trapped by the base ply 14 .
  • the present invention eliminates crushing, which occurs at heavy weights in existing designs.
  • the auto-slice unit 80 and the lead-in roll ahead of the auto-slice are both fully adjustable for optimum performance.
  • the present invention also includes an arrangement similar to that shown in Figure 5, but with the auto-slice removed so that a vacuum slot only is provided within the loop of the top wire for removing water upwardly.
  • the radius of curvature of the upstream portion of the curved surface of the inverted vacuum box that is the portion having opposing foils, has a radius of curvature of approximately 15 meters, while the remainder of the curved surface of the inverted vacuum box has a radius of 5 meters.
  • that portion of the inverted box adjacent to the opposing foils is flat, while the remainder of the curved surface is curved.
  • the various embodiments of the present invention enable even dewatering of the top ply in a multi-ply former so that the consistency of the stock forming the top ply is increased during passage thereof through the forming section while maintaining the consistency of the top ply uniform in a "Z" direction so that crushing of the resultant web is inhibited.

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  • Paper (AREA)
  • Containers And Plastic Fillers For Packaging (AREA)
EP92918202A 1992-08-19 1992-08-19 A multi-ply web forming apparatus Expired - Lifetime EP0656084B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/GB1992/001517 WO1994004749A1 (en) 1992-08-19 1992-08-19 A multi-ply web forming apparatus
CA002142262A CA2142262C (en) 1992-08-19 1992-08-19 A multi-ply web forming apparatus

Publications (2)

Publication Number Publication Date
EP0656084A1 EP0656084A1 (en) 1995-06-07
EP0656084B1 true EP0656084B1 (en) 1996-11-27

Family

ID=4155221

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92918202A Expired - Lifetime EP0656084B1 (en) 1992-08-19 1992-08-19 A multi-ply web forming apparatus

Country Status (5)

Country Link
EP (1) EP0656084B1 (fi)
JP (1) JP2639439B2 (fi)
AU (1) AU668097B2 (fi)
DE (1) DE69215542T2 (fi)
FI (1) FI112673B (fi)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3823966C2 (de) * 1988-07-15 1995-03-16 Voith Gmbh J M Vorrichtung zum Führen der Siebe einer Doppelsiebpartie einer Papier- oder Kartonmaschine
JP2808491B2 (ja) * 1990-12-19 1998-10-08 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
FI950731A (fi) 1995-02-17
EP0656084A1 (en) 1995-06-07
DE69215542D1 (de) 1997-01-09
DE69215542T2 (de) 1997-05-15
JP2639439B2 (ja) 1997-08-13
JPH07509545A (ja) 1995-10-19
AU668097B2 (en) 1996-04-26
FI950731A0 (fi) 1995-02-17
AU2468492A (en) 1994-03-15
FI112673B (fi) 2003-12-31

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