EP1719835A1 - Machine pour la fabrication d'une bande fibreuse - Google Patents

Machine pour la fabrication d'une bande fibreuse Download PDF

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Publication number
EP1719835A1
EP1719835A1 EP06111077A EP06111077A EP1719835A1 EP 1719835 A1 EP1719835 A1 EP 1719835A1 EP 06111077 A EP06111077 A EP 06111077A EP 06111077 A EP06111077 A EP 06111077A EP 1719835 A1 EP1719835 A1 EP 1719835A1
Authority
EP
European Patent Office
Prior art keywords
strip
machine according
strips
band
width
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.)
Ceased
Application number
EP06111077A
Other languages
German (de)
English (en)
Inventor
Volker Schmidt-Rohr
Thomas Dr. Jaschinski
Thomas RÜHL
Peter Kahl
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.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
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 Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP1719835A1 publication Critical patent/EP1719835A1/fr
Ceased 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
    • D21F1/483—Drainage foils and bars
    • 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
    • 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

  • the invention relates to a machine for producing a fibrous web, in particular a paper or board web, with at least one circulating porous and at least one fibrous suspension-carrying band, in particular a screen belt, and with a strip part, with a plurality of the moving strip touching strips with a respective strip width is fitted, which extend transversely to the direction of the at least one band and define intermediate slots with a respective slot width and thus form a strip structure.
  • Such a machine is for example from the European Patent EP 0 831 173 B1 known.
  • the formation of the fibrous web to be produced is improved by grooved pulses generated by bars and introduced into the pulp suspension.
  • the strips of a strip part are either permanently installed or flexibly pressureable.
  • Usual strip structures consist of strips of the same width, which are installed with the same strip spacing to each other. This results in a constant division of the assembly.
  • the invention has for its object to provide an improved machine of the type mentioned, the formation of disturbing and regular stripes in the machine direction in the formation of a fibrous web produced on this machine largely, preferably completely prevent.
  • the Irregularity extends to the formed of the strips pitch widths in the machine direction, the strip widths and / or the slot widths.
  • This design of the strip part ensures that even in high-speed machines for producing a fibrous web, in particular a paper or board web, no disturbances in the sheet structure of the fibrous web produced occur, and this regardless of the structural design of the former.
  • the occurrence of disturbances in the form of regular and aligned in the machine direction strip is largely, preferably completely prevented.
  • the most irregularly designed part of the inguinal structure is ⁇ 70%, preferably ⁇ 90 of the entire inguinal structure, since in these areas the disturbances are prevented in the best possible way. It is also advantageous if at least a plurality of sectional areas of the last structure are formed as irregularly as possible, wherein the sectional and as irregular as possible trained areas of the strip structure are again ⁇ 70%, preferably ⁇ 90 of the entire strip structure. Overall, the occurrence of any possible stripes is effectively avoided in these embodiments.
  • a part or region of the same embodiment preferably comprises a maximum of three, preferably a maximum of two pairs of strips, so that the emergence of a regularity, which leads to described disturbances, is effectively prevented in the strip part.
  • the grooved part according to the invention is arranged in front of the immobility point of the pulp suspension.
  • the strip part is arranged in a region in which the average consistency of the fibrous web that is formed is less than 6%.
  • the strip part according to the invention may be designed as an evacuated unit, wherein this evacuated unit may in turn comprise a forming suction device.
  • the respective slots formed between two adjacent strips preferably have a slot width in the range from 10 to 150 mm, preferably from 15 to 100 mm, in particular from 20 to 80 mm.
  • the strip part according to the invention may be formed as an unabsorbed unit.
  • the unabsorbed unit may comprise a plurality of solid strips or a formation box with a plurality of preferably flexibly compressible formation strips.
  • the respective slots formed between two adjacent strips preferably have a slot width in the range from 30 to 400 mm, preferably from 50 to 350 mm, in particular from 100 to 300 mm.
  • the single bar preferably has a bar width in the range of 4 to 90 mm, preferably 20 to 40 mm.
  • the width ranges are sufficient to generate sufficient inguinal impulses and to introduce them into the pulp suspension.
  • the described disturbances in the sheet structure of the fibrous web produced preferably occur in high-speed machines with a twin-wire former
  • a Formiersauger is arranged with a solid strip covering and in the belt loop of
  • the first bands of the twin-wire former are preferably arranged in individually moldable strips with respect to the forming tape of the second band, and that at least the strip covering of the forming strip and / or the formation strip preferably being individually compressible is / are formed in accordance with the invention.
  • the illustrated strip part 1 shows a schematic and partial side view of a last part 1 according to the prior art.
  • the illustrated strip part 1 may be, for example, an evacuated unit, such as a Formiersauger act.
  • TL 1 and TS 1 are the parameters for the first pair of bars;
  • TL m and TS m are the parameters for the m-th bar pair and TL n the parameters for the n-th and thus last bar in the direction of the tape 2.
  • n m + 1.
  • FIG. 2 now shows a schematic and partial side view of a strip part 1 in the first embodiment according to the invention. It is for example designed as an evacuated unit, which may comprise a Formiersauger.
  • the strip part 1 is in turn equipped with several strips 2 and 3.N (3.1, 3.2, 3.3, 3.4) touching the running strip 2 with a respective strip width TL n (TL 1 , TL 2 , TL 3 ) extending transversely to the direction L (Arrow) of the band 2 extend and intervening slots 4.m (4.1, 4.2, 4.3) with a respective slot width TS m (TS 1 , TS 2 , TS 3 ) limit and thus form a last structure T.
  • TL n TL 1 , TL 2 , TL 3
  • intervening slots 4.m 4.1, 4.2, 4.3
  • the irregularity is based on that of the strips 3.n formed division widths (sum T teil.a from TL a and TS a , where 1 ⁇ a ⁇ m) in the machine direction L (arrow), the strip widths TL n and / or the slot widths TS m extends.
  • the most irregularly formed part of the strip structure T is part.a ⁇ 70%, preferably ⁇ 90, of the entire strip structure T.
  • the strip part 1 is arranged in front of the immobility point of the pulp suspension carried by the running belt 2 but not explicitly shown.
  • the strip part 1 is thus arranged in a region in which the average consistency of the forming fibrous web is less than 6%.
  • the individual strip 3.n (3.1, 3.2, 3.3, 3.4) has a strip width TL n (TL 1 , TL 2 , TL 3 ) in the range from 4 to 90 mm, preferably from 20 to 40 mm.
  • the strip width TL n (TL 1 , TL 2 , TL 3 ) of the strip part 1 of FIG. 2 may, for example, assume the following values in the following order: 90 mm, 20 mm, 40 mm, 20 mm, 25 mm, 40 mm, 30 mm and 20 mm.
  • the respective slots 4.m (4.1, 4.2, 4.3) formed between two adjacent strips 3.a and 3.b have a slot width TS m (TS 1 , TS 2 , TS 3 ) in the range of 10 to 150 mm, preferably of 15 to 100 mm, in particular from 20 to 80 mm.
  • the slot widths (TL 1 , TL 2 , TL 3 ) of the strip part 1 of FIG. 2 may, for example, assume the following values in the following order: 30 mm, 20 mm, 30 mm, 25 mm, 30 mm, 40 mm and 20 mm.
  • the irregularity of the strip structure T teil.a (T teil.1 , T teil.2 ) thus extends both to the dividing widths formed by the strips 3.n (3.1, 3.2, 3.3, 3.4) (sum T teil.a from TL a and TS a , where 1 ⁇ a ⁇ m) in the machine direction L (arrow), the strip widths TL n (TL 1 , TL 2 , TL 3 ) and the slot widths TS m (TS 1 , TS 2 , TS 3 ).
  • the division pairs are therefore all arranged randomly, that is, there are no systematic repetitions.
  • FIG. 3 shows a schematic and partial side view of a strip part 1 in the second embodiment according to the invention.
  • a strip part 1 is again designed as an evacuated unit, which may comprise a Formiersauger.
  • the strip part 1 may also comprise an unsized unit with a plurality of solid strips or a formation box with a plurality of preferably flexibly compressible formation strips.
  • the strip part 1 is again provided with a plurality of strips 3.n (3.1, 3.2, 3.3, 3.4, 3.5) which contact the moving strip 2 with a respective strip width TL n (TL 1 , TL 2 , TL 3 , TL 4 ), which extend transversely to the running direction L (arrow) of the band 2 and intermediate slots 4.m (4.1, 4.2, 4.3, 4.4) with a respective slot width TS m (TS 1 , TS 2 , TS 3 , TS 4 ) and thus form a last structure T part.a (sum of TL a and TS a ), where 1 ⁇ a ⁇ m.
  • two sectional areas of the bar structure T are square 1 (sum of T part 1 and T part 2 ) and T section 2 (sum of T teil.3 and T teil.4 ) formed as irregular as possible.
  • a part or region of identical design comprises two pairs of strips 3.a and 3.b.
  • the part or area of equal training comprises a maximum of three pairs of bars.
  • the strip part 1 is again arranged in front of the immobility point of the fibrous suspension carried by the running belt 2 but not explicitly shown.
  • the strip part 1 is thus arranged in a region in which the average consistency of the forming fibrous web is less than 6%.
  • the individual strip 3.n (TL 1 , TL 2 , TL 3 , TL 4 ) has a strip width TL n (TL 1 , TL 2 , TL 3 , TL 4 ) in the range from 4 to 90 mm, preferably from 20 to 40 mm up.
  • the strip widths TL n (TL 1 , TL 2 , TL 3 , TL 4 ) of the strip part 1 of FIG. 3 may, for example, assume the following values in the following order: 90 mm, 20 mm, 40 mm, 20 mm, 25 mm, 40 mm, 30 mm and 20 mm.
  • the respective slots 4.m (4.1, 4.2, 4.3, 4.4) formed between two adjacent strips 3.a and 3.b have a slot width TS m (TS 1 , TS 2 , TS 3 , TS 4 ) in the range from 10 to 150 mm, preferably from 15 to 100 mm, in particular from 20 to 80 mm.
  • the slot widths TS m (TS 1 , TS 2 , TS 3 , TS 4 ) of the strip part 1 of FIG. 2 may, for example, assume the following values in the following order: 30 mm, 20 mm, 30 mm, 25 mm, 30 mm, 40 mm and 20 mm.
  • FIG. 4 shows a schematic side view of a double-wire zone 6 of a twin-wire former 5 with a strip part 1 according to the invention.
  • the twin-wire former 5 is part of a machine for producing a fibrous web, in particular a paper or board web, and comprises two circulating porous belts 2.1 and 2.2, in particular two screen belts, each forming a belt loop 7.1 and 7.2.
  • the first belt (lower wire, inner wire) 2.1 runs over a peripheral region 9 of a first deflecting element (forming roll) 8 and the second belt (upper wire, outer screen) 2.2 runs over a peripheral region 11 of a second deflecting element (breast roll) 10.
  • the two belts 2.1 and 2.2 forming a wedge-shaped material inlet gap 12, which receives the at least one pulp suspension directly from a headbox 13 indicated only schematically, in the region of the first deflecting element 8 and then form at least one preferably substantially vertical twin-wire zone 6.
  • the twin-wire zone 6 is guided in its end region 14 via a separating element 15, in particular wire suction roll 15.1.
  • the separating element 15 is arranged in such a way that it separates the first band 2.1 and the fibrous web to be formed from the second band 2.2, which is guided via a discharge roller 16.
  • the band profile in the region of the separating element 15 can also be mirror-inverted.
  • suction devices are usually arranged in the band loop of the first band 2.1.
  • a Formiersauger 17 is arranged with a solid strip covering 18 and in the belt loop 7.1 of the first belt 2.1 a plurality of preferably individually contactable molding strips 19 against the Formiersauger 17 of the second belt 2.2 are arranged. It is envisaged that at least the strip covering 18 of the Formiersaugers 17 and / or the preferably individually compressible formation strips 19 according to the invention, as set forth for example in the embodiments of Figures 2 and 3, are formed and arranged.
  • the invention provides a machine of the type mentioned, the formation of disturbing and regular strips in the machine direction in the formation of a fibrous web produced on this machine largely, preferably completely prevented.

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  • Paper (AREA)
EP06111077A 2005-05-04 2006-03-14 Machine pour la fabrication d'une bande fibreuse Ceased EP1719835A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200510020739 DE102005020739A1 (de) 2005-05-04 2005-05-04 Maschine zur Herstellung einer Faserstoffbahn

Publications (1)

Publication Number Publication Date
EP1719835A1 true EP1719835A1 (fr) 2006-11-08

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EP06111077A Ceased EP1719835A1 (fr) 2005-05-04 2006-03-14 Machine pour la fabrication d'une bande fibreuse

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EP (1) EP1719835A1 (fr)
DE (1) DE102005020739A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011116999A1 (fr) * 2010-03-26 2011-09-29 Voith Patent Gmbh Système de formation de feuille pour une machine de fabrication d'une bande fibreuse et procédé associé

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1761959A1 (de) * 1968-07-27 1971-10-07 Voith Gmbh J M Blattbildungspartie fuer Langsiebpapiermaschinen
WO1993012291A1 (fr) * 1991-12-17 1993-06-24 J.M. Voith Gmbh Machine a papier a deux toiles
EP0831173A2 (fr) * 1996-09-13 1998-03-25 Voith Sulzer Papiermaschinen GmbH Caisse aspirante à coulisseau de dimensionnement
WO2002072950A1 (fr) * 2001-03-13 2002-09-19 Voith Paper Patent Gmbh Formeur a double toile

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1761959A1 (de) * 1968-07-27 1971-10-07 Voith Gmbh J M Blattbildungspartie fuer Langsiebpapiermaschinen
WO1993012291A1 (fr) * 1991-12-17 1993-06-24 J.M. Voith Gmbh Machine a papier a deux toiles
EP0831173A2 (fr) * 1996-09-13 1998-03-25 Voith Sulzer Papiermaschinen GmbH Caisse aspirante à coulisseau de dimensionnement
WO2002072950A1 (fr) * 2001-03-13 2002-09-19 Voith Paper Patent Gmbh Formeur a double toile

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011116999A1 (fr) * 2010-03-26 2011-09-29 Voith Patent Gmbh Système de formation de feuille pour une machine de fabrication d'une bande fibreuse et procédé associé

Also Published As

Publication number Publication date
DE102005020739A1 (de) 2006-11-09

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