EP1936031B1 - Machine destinée à la fabrication d'une bande de matière fibreuse - Google Patents

Machine destinée à la fabrication d'une bande de matière fibreuse Download PDF

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Publication number
EP1936031B1
EP1936031B1 EP07121702A EP07121702A EP1936031B1 EP 1936031 B1 EP1936031 B1 EP 1936031B1 EP 07121702 A EP07121702 A EP 07121702A EP 07121702 A EP07121702 A EP 07121702A EP 1936031 B1 EP1936031 B1 EP 1936031B1
Authority
EP
European Patent Office
Prior art keywords
belt
fibrous web
structured
machine according
web
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.)
Not-in-force
Application number
EP07121702A
Other languages
German (de)
English (en)
Other versions
EP1936031A1 (fr
Inventor
Thomas Scherb
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
Priority to PL07121702T priority Critical patent/PL1936031T3/pl
Publication of EP1936031A1 publication Critical patent/EP1936031A1/fr
Application granted granted Critical
Publication of EP1936031B1 publication Critical patent/EP1936031B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006—Making patterned paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14—Making cellulose wadding, filter or blotting paper
    • D21F11/145—Making cellulose wadding, filter or blotting paper including a through-drying process
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S162/00—Paper making and fiber liberation
    • Y10S162/90—Papermaking press felts

Definitions

  • the invention relates to a machine for producing a fibrous web, in particular paper, board or tissue web, with a former in which the fibrous web is formed on a structured band and dewatered between this and a forming belt, as well as with a drying device for further dewatering of the fibrous web through which the fibrous web is guided together with the structured band and in which the permeable structured band and the fibrous web are flowed through by hot air.
  • a machine is for example in the WO 2005/075737 A1 described.
  • the document US 2006/0085998 describes a process for making a tissue or sanitary membrane.
  • the web is formed in the forming part of the tissue machine between a structured sieve and an outer forming fabric in the region of a forming roll. Subsequently, the tissue web, lying on the structured wire, is passed through a drying device and then transferred to a Yankee drying cylinder for further treatment .
  • Such a printed forming belt can be used for example in conventional tissue machines.
  • the use of a printed forming belt brings no advantage because the sheet is 100% pressed and the volume is too small to produce a micro- and macro-embossed sheet in the machine , It is a corresponding processing plant for embossing the sheet required.
  • a printed forming belt can also be used in a TAD (Through Air Drying) machine where the volume and sheet capacity are 50 to 100% higher than conventional machines.
  • TAD Three Air Drying
  • Fig. 1 can be removed, in such a TAD machine, the sheet between two mesh belts 10, 12 is formed. It shows Fig. 1 in schematic Partial representation of the Formier Scheme such a TAD machine.
  • Fig. 2 is shown in a schematic representation of the TAD machine including the TAD cylinder 14. As in particular on the basis of Fig. 2 can be seen, in such a TAD machine, the fibrous web is dewatered by means of vacuum following the forming area, wherein such dewatering takes place to a dry content of between 22 and 26%.
  • the fibrous web then transferred from the one forming fabric or belt 10, which is a smooth belt, to an embossing or structured belt 16, where it is wet-embossed by means of a vacuum box or wet embossing box, which sucks the fibers into the wells of the structured band 16.
  • TAD machine requires a negative pull between the forming zone and the TAD zone.
  • TAD machines in the TAD section are driven at 20% less speed to brush the fibers into the troughs of the belt. This will destroy all macro imprinting (drawings) of the printed forming belt due to the difference in speed between the forming zone and the TAD zone.
  • macro- and micro-embossing must be done with the textured tape in the TAD zone rather than in the forming zone.
  • the quality is generated in the TAD zone.
  • the negative pull (-0.8 V) in such a machine which serves to produce the quality, destroys the embossing effect.
  • the areas 18 can be seen in which the fibrous web has no contact with the Yankee cylinder after being transferred from the structured band 16 to the Yankee cylinder 14.
  • the invention has for its object to provide a machine of the type mentioned, which is comparable in terms of quality, volume and water absorbency of the fibrous web produced with a TAD machine.
  • the Formierband is formed by a printed Formierband or a DSP band with zonal different permeability, wherein the printed Formierband or DSP band formed by a Formierband whose passing with the pulp suspension in contact with the surface Lines, dots and / or the like is coated.
  • a printed Formierband can be used in particular such a printed Formierband, as in the WO 00/75423 A1 is described.
  • the invention thus provides a machine for producing a fibrous web, in particular paper, board or tissue web, which comprises a former in which the fibrous web is formed on a structured belt and between this and a printed forming belt or DSP belt with zonal different permeability is dewatered, as well as a drying device for further dewatering of the fibrous web comprises, through which the fibrous web is then guided together with the structured band and in which the permeable structured band and the fibrous web are flowed through by hot air.
  • the generated fibrous web is already wet-structured in the machine, it is no longer necessary to continue to emboss the web as it passes through an expensive processing facility to transfer the micro and macro structures into the fiber material web press. It is thus avoided in particular that the structure must be pressed into the already dry fibrous web in a processing plant, which would bring a compaction of the web with it, whereby the quality, the volume and the capacity would be reduced.
  • the coating material may for example consist of plastic, rubber and / or the like.
  • the coating material consists of plastic, it is expediently composed of polyethylene, polyamide, polyurethane and / or the like.
  • the printed forming belt can be designed in particular as shown in the WO 00/75423 A1 is described.
  • the printed forming tape or DSP tape is provided for macro embossing and the structured tape for micro embossing of the fibrous web.
  • the fibrous web is formed at a consistency in a range of about 0.15 to about 0.35% on the structured tape.
  • the fibrous web is further dehydrated in the drying device between the structured belt and a dewatering belt, wherein the hot air successively passing through the permeable structured band, fibrous web and dewatering band.
  • the drying device advantageously comprises an evacuated device, such as in particular a suction roller, over which the structured belt, the fibrous web and optionally the dewatering belt are guided.
  • an evacuated device such as in particular a suction roller
  • the structured band, the fibrous web and optionally the dewatering belt are pressed by a permeable press belt against the evacuated device.
  • a permeable press belt against the evacuated device.
  • the permeable press belt and then the fibrous web flow through the hot air.
  • the drying device expediently comprises a hot air hood.
  • this hot air hood is at least substantially opposite to a suction zone of the evacuated device.
  • the fibrous web is guided, together with the structured strip following the drying device, through a press nip formed between a drying cylinder, in particular a Yankee cylinder, and a pressing element.
  • means may be provided to crepe the dry fibrous web in the area of the drying cylinder.
  • the machine is preferably used for the production of tissue paper.
  • the fibrous web is thus dehydrated between a structured or embossing belt and a printed forming belt or DSP belt. Further dewatering of the fibrous web is expediently carried out between the structured band and a dewatering band.
  • the fibrous web is dewatered through the dewatering belt opposite the structured belt.
  • the dewatering is carried out by an air flow, in particular hot air flow, and a mechanical pressure field, which is preferably generated by a permeable pressing belt.
  • the air flow runs from the permeable press belt to the drainage belt.
  • the sandwiched bands form a stretching in the web running direction press nip on a vacuumed device such as in particular a suction roll.
  • the maximum peak pressure can be 40 times less than in a conventional press, in addition to this extended press nip is traversed by air.
  • the fibrous web is supported and / or protected by the structured web and advantageously continued to a Yankee drying device.
  • the fibrous web is further dried by this, for example, a Yankee cylinder and a hood drying device and creped dry.
  • a structured fibrous web is produced, which is comparable to a TAD product.
  • the same high quality is achieved without the need for a complex and expensive TAD machine.
  • the cost can be reduced to about 40%, with less equipment and less labor.
  • the machine can be kept simpler in construction, while the operation and maintenance are simplified. Total expenditure including energy, clothing, chemicals, etc. is reduced to about 35%.
  • the fibrous web is formed on a structured band, with a very low consistency, for example, between 0.15% to 0.35%, and the same structured belt carries the fibers within its structure protected from the head box to the point of transfer to the Yankee drying unit.
  • the Yankee drying unit only the fibers in the raised area (knuckle area) of the structured strip are pressed.
  • the protected fibers within the structure of the patterned tape remain unpressed to achieve the appropriate quality.
  • the troughs of the structured tape are filled with the largest possible amount of fibers, since this represents the mass of unpressed fibers, which entails the high quality of the final product.
  • a forming belt is selected, with which it is ensured that the wells of the structured belt remain filled with the largest possible amount of fibers.
  • the fibrous web produced is already structured, it is no longer necessary to further emboss the fibrous web as it passes through an expensive processing plant in order to introduce the micro- and macro-structures in the web. It is thus avoided that compressing the structure in the dry fibrous web in a processing plant, the fibrous web and accordingly the quality, volume and capacity are reduced.
  • the micro-embossing can be carried out within the machine without densification of the fibers on the structured or embossing band and the macro-embossing by using the special printed Formierbandes, as for example in the WO 00/75423 A1 is described.
  • a DSP band with different permeability can also be used.
  • a conventional embossing according to the invention thus takes place a fiber shift in the forming zone. This results, inter alia, the advantage that the intimacy between the bands on the evacuated device, in particular suction roll, not lost goes.
  • the evacuated device or suction roll therefore entails a maximum drainage and a maximum dry content increase.
  • the printed forming belt or DSP belt can be replaced much faster than the structured belt, if the machine with a different macro-embossing (drawing) to be driven.
  • Fig. 3 shows a schematic representation of an exemplary embodiment of an inventive machine 20 for producing a fibrous web 22, which may be in particular a paper, board or tissue web, act.
  • the machine 20 preferably serves to produce a tissue web.
  • the machine 20 comprises a former 24 in which the fibrous web 22 is formed on and dewatered between a patterned belt 26 and a forming belt formed by a printed forming belt 28 or a DSP belt of zonal different permeability.
  • the machine 20 further comprises a drying device 30 for further dewatering of the fibrous web 22, through which the fibrous web 22 is guided together with the structured band 26 and in which the permeable structured band 26 and the fibrous web 22 are flowed through by hot air.
  • the printed forming belt 28 or DSP belt can be formed, in particular, by a forming belt, the belt of which comes into contact with the pulp suspension Surface is coated with local lines, dots and / or the like.
  • the coating material may in particular consist of plastic, rubber and / or the like.
  • the coating material can consist of polyethylene, polyamides, polyurethane and / or the like.
  • a printed forming belt 26 for example, such a printed forming belt can be used, as in the WO 00/75423 A1 is described.
  • the machine 20 comprises a headbox 32 and a forming element, in particular a forming roller 34, over which the structured band 26 and the printed forming band 28 or DSP band are guided.
  • the structured band 26 or DSP band and the printed forming band 28 converge to form a material inlet gap 36, wherein they are guided over the forming roller 34 with the structured band 26 as inner band and the printed banding band 28 or DSP band as outer band , By means of the headbox 32 pulp suspension is introduced into the stock inlet gap 36.
  • At least one evacuated embossing device 38 can be provided, which is arranged on the side of the permeable structured belt 26 facing away from the fibrous web 22 and through which the fibrous web 22 is sucked into the structure of the structured belt 22.
  • the fibrous web 22 is fed to the forming device 34 along with the structured band 26 of the drying device 30, in which the fibrous web 22 between the structured band 26 and a dewatering belt 40 (for example, a felt), further dehydrated.
  • a dewatering belt 40 for example, a felt
  • the drying device 30 comprises an evacuated device, in particular a suction roller 42, over which the structured belt 26, the fibrous web 22 and the dewatering belt 40 are guided.
  • the structured band 26, the fibrous web 22 and the dewatering belt 40 can be pressed against the suction roll 42 by a permeable pressing belt 44.
  • the permeable press belt 44, the structured belt 26 and the fibrous web 22 are thus successively flowed through by the drying air, in particular hot air.
  • the drying device 30 comprises a hot air hood 46, which may face at least substantially a suction zone of the suction roll 42.
  • the fibrous web 22, together with the structured band 26 following the drying apparatus 30, is guided through a press nip 52 formed between a drying cylinder 48, in particular a Yankee cylinder, and a pressing element 50, here for example a press roll.
  • a press nip 52 formed between a drying cylinder 48, in particular a Yankee cylinder, and a pressing element 50, here for example a press roll.
  • means may be provided to crepe the dry fibrous web 22 in the region of the drying cylinder or Yankee cylinder.
  • the fibrous web 22 is supported by the structured band 26 from the former 24 to the drying cylinder or Yankee cylinder 48.
  • the printed forming belt 28 or DSP belt is provided for macro embossing and the structured belt 26 for micro embossing of the fibrous web 22.
  • the fibrous web 22 may be formed on the structured band 26 at a consistency in a range of about 0.15 to about 0.35%.
  • Fig. 4 shows a schematic simplified representation of a forming zone in which a structured band 26 and a printed forming belt 28 or a DSP band with zonal different permeability for the dewatering of the fibrous web 22 are merged.
  • Fig. 5 shows an enlarged view of the area A of Fig. 4 with the structured band 26 opposite printed Formierband 28 and DSP band. It can be seen that the quality of the paper is produced here in the forming zone.
  • Fig. 6 shows an enlarged view of the area B of Fig. 3 with the surface 54 of the Yankee cylinder 48 opposite structured band 26. As with this Fig. 6 can be seen, the embossing effect in the fibrous web 22 is maintained, which is guided on one and the same structured band 26 from the headbox 32 to the Yankee cylinder 48.
  • Fig. 7 shows a section of the finished, produced by the machine 30 according to the invention fibrous web 22, in which by the printed forming belt 28th or DSP band caused pattern 56, ie the respective macro imprints are visible.

Landscapes

  • Paper (AREA)
  • Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)

Claims (15)

  1. Machine (20) de fabrication d'une nappe (22) de matière fibreuse, en particulier d'une nappe de papier, de carton ou d'étoffe, dotée d'un dispositif de façonnage (24) dans lequel la nappe (22) de matière fibreuse est formée sur une bande structurée (26) et est essorée entre cette dernière et une bande de façonnage (28), et d'un dispositif de séchage (30) qui poursuit l'évacuation de l'eau de la nappe (22) de matière fibreuse, à travers lequel la nappe (22) de matière fibreuse est guidée en même temps que la bande structurée (26) et dans lequel la bande structurée perméable (26) et la nappe (22) de matière fibreuse sont traversées par de l'air chaud,
    caractérisée en ce que
    la bande de façonnage est formée par une bande de façonnage (28) imprimée ou une bande DSP dont la perméabilité varie d'une zone à l'autre,
    la bande de façonnage (28) imprimée ou la bande DSP étant formée par une bande de façonnage dont la surface en contact avec la suspension de matière fibreuse est revêtue localement de lignes ou de points.
  2. Machine selon la revendication 1, caractérisée en ce que le matériau de revêtement est constitué de matière synthétique ou de caoutchouc.
  3. Machine selon la revendication 2, caractérisée en ce que le matériau de revêtement est constitué de polyéthylène, polyamide ou polyuréthane.
  4. Machine selon l'une des revendications précédentes, caractérisée en ce que la bande de façonnage imprimée (28) ou la bande DSP est prévue pour réaliser un macro-gaufrage et la bande structurée (26) pour un micro-gaufrage de la nappe (22) de matière fibreuse.
  5. Machine selon l'une des revendications précédentes, caractérisée en ce que la nappe (22) de matière fibreuse est formée sur la bande structurée (26) avec une consistance comprise dans la plage d'environ 0,15 à environ 0,35 %.
  6. Machine selon l'une des revendications précédentes, caractérisée en ce que la nappe (22) de matière fibreuse est essorée davantage dans le dispositif de séchage (30) entre la bande structurée (26) et une bande (40) d'évacuation d'eau, l'air chaud traversant successivement la bande structurée perméable (26), la nappe (22) de matière fibreuse et la bande d'évacuation d'eau (40).
  7. Machine selon l'une des revendications précédentes, caractérisée en ce que le dispositif de séchage (30) comprend un dispositif aspirant (42), par exemple et en particulier un cylindre d'aspiration, sur lequel la bande structurée (26), la nappe (22) de matière fibreuse et éventuellement la bande (40) d'évacuation d'eau sont guidées.
  8. Machine selon la revendication 7, caractérisée en ce que la bande structurée (26), la nappe (22) de matière fibreuse et éventuellement la bande (40) d'évacuation d'eau sont repoussées contre le dispositif aspirant (42) par une bande perméable de pressage (44).
  9. Machine selon la revendication 8, caractérisée en ce que la bande perméable de pressage (44) est tout d'abord traversée par de l'air chaud avant que la nappe (40) de matière fibreuse le soit.
  10. Machine selon l'une des revendications 7 à 9 qui précèdent, caractérisée en ce que le dispositif de séchage (30) comprend un capot (46) à air chaud.
  11. Machine selon la revendication 10, caractérisée en ce que le capot (46) à air chaud est disposé au moins essentiellement face à une zone d'aspiration du dispositif aspirant (42).
  12. Machine selon l'une des revendications 7 à 11 qui précèdent, caractérisée en ce qu'un interstice de pressage allongé dans la direction (L) d'avancement de la nappe est formé pour la nappe (22) de matière fibreuse au-dessus du dispositif aspirant (42).
  13. Machine selon l'une des revendications précédentes, caractérisée en ce que la nappe (22) de matière fibreuse est guidée en même temps que la bande structurée (26) dans un interstice de pressage (52) formé entre un cylindre de séchage (48), en particulier un cylindre dit "yankee" et un élément de pressage (50) en aval du dispositif de séchage (30).
  14. Machine selon la revendication 13, caractérisée en ce qu'elle présente des moyens qui crêpent la nappe séchée de matière fibreuse dans la zone du cylindre de séchage.
  15. Machine selon l'une des revendications précédentes, caractérisée en ce que la nappe (22) de matière fibreuse est portée par la bande structurée (26) entre le dispositif de façonnage (24) et le cylindre de séchage ou cylindre yankee (48).
EP07121702A 2006-12-22 2007-11-28 Machine destinée à la fabrication d'une bande de matière fibreuse Not-in-force EP1936031B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL07121702T PL1936031T3 (pl) 2006-12-22 2007-11-28 Maszyna do wytwarzania wstęgi z substancji włóknistej

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102006062237A DE102006062237A1 (de) 2006-12-22 2006-12-22 Maschine zur Herstellung einer Faserstoffbahn

Publications (2)

Publication Number Publication Date
EP1936031A1 EP1936031A1 (fr) 2008-06-25
EP1936031B1 true EP1936031B1 (fr) 2010-11-10

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP07121702A Not-in-force EP1936031B1 (fr) 2006-12-22 2007-11-28 Machine destinée à la fabrication d'une bande de matière fibreuse

Country Status (6)

Country Link
US (1) US7976683B2 (fr)
EP (1) EP1936031B1 (fr)
AT (1) ATE487826T1 (fr)
DE (2) DE102006062237A1 (fr)
ES (1) ES2353338T3 (fr)
PL (1) PL1936031T3 (fr)

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ATE487826T1 (de) 2010-11-15
DE502007005607D1 (de) 2010-12-23
ES2353338T3 (es) 2011-03-01
US7976683B2 (en) 2011-07-12
EP1936031A1 (fr) 2008-06-25
US20080149292A1 (en) 2008-06-26
DE102006062237A1 (de) 2008-06-26
PL1936031T3 (pl) 2011-04-29

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