EP1120491B1 - Machine and method for manufacturing a tissue web - Google Patents
Machine and method for manufacturing a tissue web Download PDFInfo
- Publication number
- EP1120491B1 EP1120491B1 EP00127612A EP00127612A EP1120491B1 EP 1120491 B1 EP1120491 B1 EP 1120491B1 EP 00127612 A EP00127612 A EP 00127612A EP 00127612 A EP00127612 A EP 00127612A EP 1120491 B1 EP1120491 B1 EP 1120491B1
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- European Patent Office
- Prior art keywords
- fabric
- zone
- dewatering
- different
- permeability
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- 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
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004519 manufacturing process Methods 0.000 title claims 3
- 230000035699 permeability Effects 0.000 claims abstract description 30
- 239000004744 fabric Substances 0.000 claims description 34
- 230000003750 conditioning effect Effects 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000009941 weaving Methods 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000004049 embossing Methods 0.000 description 2
- 239000002759 woven fabric Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
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- 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
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/0027—Screen-cloths
-
- 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
- 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
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- 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
- Y10S162/903—Paper forming member, e.g. fourdrinier, sheet forming member
Definitions
- the invention relates to a machine for producing a tissue web with a forming region comprising at least one continuous endless dewatering screen. It further relates to a method according to the preamble of claim 9.
- WO-A-9855691 discloses a machine for producing a tissue web having a forming area comprising at least one continuous endless dewatering screen with zonal different screen permeability, wherein there is a press nip for the tissue web, which is formed by a shoe press unit and a counter roll.
- the aim of the invention is to provide a machine and a method of the type mentioned, with which the structure and structure, ie the arrangement of the fibers of a tissue web, especially at high machine speeds can be designed so that the water absorption capacity, the water retention capacity, the water absorption rate and the bulk volume are increased or improved as economically as possible.
- Sieves zonal different permeability are known for example from SE 427053. Thereafter, the sieves in question, for example, consist of a fabric in which provided in one or more levels longitudinal and transverse threads are interwoven according to a predetermined pattern so that systematically distributed areas of suitable size arise in which the number of crossing points equal to zero or significantly smaller than in the weave structure of the remaining fabric.
- At least one dewatering screen with zonal different screen permeability in the initial drainage area is provided in which the highest dewatering rates (liters / min) occur.
- the advantageous effect is particularly effective at higher dewatering rates, which are correspondingly higher with increasing machine speed.
- the dewatering is carried out at a machine speed greater than about 1300 m / min, in particular greater than about 1500 m / min and preferably greater than about 1800 m / min.
- a preferred practical embodiment of the machine according to the invention comprises a former with two continuous endless dewatering belts, which converge to form a material inlet gap and then passed over a forming element such as in particular a forming roller, as outer band not coming into contact with the forming element and / or as inner band Drainage sieve with zonal different Sieb make is provided.
- a forming element such as in particular a forming roller
- a drainage sieve with zonal different sieve permeability ie a so-called DSP sieve may be provided as outer band and / or as inner band. If only one of the two bands is formed by such a DSP screen, the other band may be a conventional tissue dewatering screen.
- a crescent former is provided as a former, whose outer band is formed by a dewatering screen with zonal different screen permeability and the inner band by a felt belt.
- the largest extent of the area of the subsections of the dewatering sieve with zonal different sieve permeability is expediently Az ⁇ 5 mm, preferably Az ⁇ 3 mm.
- the dewatering screen of zonal different Sieb is not needled with felt-like fibers, but from a weft and warp formed fabric, i. consists only of weft and warp threads.
- the zones of different Sieb are advantageously generated by the use of weaving threads of different diameters and / or different weave pattern.
- the dewatering screen with zonal different screen permeability is used in a range in which the dry content of the tissue web is less than about 20% and in particular less than about 12%, and preferably in the initial sheet forming area at a dry content of less than about 6%.
- the drainage sieve zonal different Sieb is preferably associated with a conditioning device such as in particular a sieve cleaning device.
- a conditioning device such as in particular a sieve cleaning device.
- spray tubes can be provided with distributed over the machine width nozzles.
- the screens in question may in particular consist of a woven fabric in which threads in one or more planes extending in a first direction are interwoven with threads extending in a second direction to form a grid comprising a plurality of systematically distributed portions predetermined system configuration separates and determines accordingly, the systematically distributed areas each comprise at least three in one and at least three extending in the other direction threads.
- the threads may in particular be weft threads and warp threads.
- the former 10 shown in FIG. 1 is part of a machine for producing a tissue web 12.
- a dewatering sieve with zonal different sieve permeability i. a DSP sieve provided.
- the former 10 comprises in each case two circulating endless drainage belts 14, 16, which converge to form a material inlet gap 18 and then guided over a forming element formed here by a forming roller 20.
- the pulp suspension is introduced by means of a headbox 22.
- Figure 1 shows schematically a crescent former 10 in which outer belt 16, which does not contact forming drum 20, has a dewatering screen with zonal different screen permeability, i. a so-called DSP screen, is provided.
- the inner band 14 is formed here by a felt belt.
- the DSP screen 16 may be associated with a conditioning device 50, in particular a screen cleaning device.
- the forming tissue web 12 is fed following the forming roller 20 together with the inner band 14 an extended press nip 52 which is formed between a tissue-drying cylinder or Yankee cylinder 54 and a shoe press unit, here a shoe press roller 56.
- an extended press nip 52 which is formed between a tissue-drying cylinder or Yankee cylinder 54 and a shoe press unit, here a shoe press roller 56.
- the tissue web 12 leading inner band 14 via an evacuated device, here a suction roller 58, out.
- the Yankee cylinder 54 may be associated with a dryer hood 60.
- the respective dewatering screens with zonal different Sieb can for example consist of a tissue formed by weft and warp threads.
- the zones of different screen permeability can be produced, for example, by the use of woven threads of different diameters and / or different weave patterns.
- the screens in question may in particular consist of a woven fabric in which threads in one or more planes running in a first direction are interwoven with threads extending in a second direction so as to form a grid comprising a plurality of systematically distributed portions specifiable configuration separated and determined accordingly, the systematically distributed areas each comprise at least three in one and at least three extending in the other direction threads.
- the threads may in particular be weft threads and warp threads.
- FIG. 2 purely by way of example shows a weave pattern diagram of a repeating section of a possible embodiment of a drainage sieve formed by such a fabric with zonal different permeability.
- the repeating weave pattern diagram in the present embodiment includes ten warp threads and ten Wefts. In the area of hatched squares, the respective weft thread is below the respective warp thread. By contrast, in the area of the light squares, the respective weft thread lies above the respective warp thread. Depending on the particular circumstances, one or the other side of the weave pattern diagram may be outside.
- the hatched areas form a grid 62, by which a plurality of systematically distributed areas 64 of predeterminable configuration are finally separated from each other and defined accordingly.
Abstract
Description
Die Erfindung betrifft eine Maschine zur Herstellung einer Tissuebahn mit einem zumindest ein umlaufendes endloses Entwässerungssieb umfassenden Formierbereich. Sie betrifft ferner ein Verfahren gemäß dem Oberbegriff des Anspruchs 9.The invention relates to a machine for producing a tissue web with a forming region comprising at least one continuous endless dewatering screen. It further relates to a method according to the preamble of
Bisher wird versucht, die Qualitätsparameter einer Tissuebahn, wie z.B. das Wasseraufnahmevermögen, das Wasserrückhaltevermögen und die Wasseraufnahmegeschwindigkeit, durch die Gestaltung der Oberflächenstruktur der Bahn zu beeinflussen. Im Stand der Technik (vgl. z.B. US 5 746 887, US 5 492 598, SE 427053) wird vorgeschlagen, sogenannte Prägesiebe oder -filze einzusetzen. Diese prägen der schon gebildeten Tissuebahn ihre eigene Oberflächenstruktur auf. Bei diesem Vorgang wird die Tissuebahn auf Druck belastet und dadurch einem angestrebten hohen Volumen (bulk) entgegengewirkt. Gleichzeitig erfordert dieses Verfahren einen hohen apparativen Aufwand, da die Prägesiebe nur zu diesem Zweck eingesetzt werden. Oftmals werden diese Verfahren noch mit speziellen, teuren Trocknungsverfahren zur Erhöhung des spezifischen Volumens kombiniert.Heretofore, attempts have been made to improve the quality parameters of a tissue web, e.g. the water absorption capacity, the water retention capacity and the water absorption rate, influenced by the design of the surface structure of the web. In the prior art (see for example US 5 746 887, US 5 492 598, SE 427053) it is proposed to use so-called embossing screens or felts. These characterize the tissue web already formed their own surface structure. In this process, the tissue web is subjected to pressure and thereby counteracts a desired high volume (bulk) counteracted. At the same time, this method requires a high expenditure on equipment, since the embossing screens are used only for this purpose. Often, these methods are still combined with special, expensive drying methods to increase the specific volume.
Aus der WO 96/35018 und der US 5,654,076 sind Doppelsiebformer bekannt, bei denen ein Sieb mit zonal unterschiedlicher Siebdurchlässigkeit ausgebildet ist.From WO 96/35018 and US 5,654,076 twin-wire former are known in which a sieve is formed with zonal different Siebdurchlässigkeit.
WO-A-9855691 offenbart eine Maschine zur Herstellung einer Tissuebahn mit einem zumindest ein umlaufendes endloses Entwässerungssieb mit zonal unterschiedlicher Siebdurchlässigkeit umfassenden Formierbereich, wobei für die Tissuebahn ein Pressspalt vorhanden ist, der durch eine Schuhpresseinheit und eine Gegenwalze gebildet wird.WO-A-9855691 discloses a machine for producing a tissue web having a forming area comprising at least one continuous endless dewatering screen with zonal different screen permeability, wherein there is a press nip for the tissue web, which is formed by a shoe press unit and a counter roll.
Ziel der Erfindung ist es, eine Maschine sowie ein Verfahren der eingangs genannten Art zu schaffen, mit denen der Aufbau und die Struktur, d.h. die Anordnung der Fasern einer Tissuebahn insbesondere auch bei hohen Maschinengeschwindigkeiten so gestaltet werden können, daß das Wasseraufnahmevermögen, das Wasserrückhaltevermögen, die Wasseraufnahmegeschwindigkeit und das spezifische Volumen (bulk) auf möglichst wirtschaftliche Art und Weise erhöht bzw. verbessert werden.The aim of the invention is to provide a machine and a method of the type mentioned, with which the structure and structure, ie the arrangement of the fibers of a tissue web, especially at high machine speeds can be designed so that the water absorption capacity, the water retention capacity, the water absorption rate and the bulk volume are increased or improved as economically as possible.
Diese Aufgabe wird erfindungsgemäß durch das Merkmal des kennzeichnenden Teils das Anspruchs 1 gelöst.This object is achieved by the feature of the characterizing part of
Aufgrund der Merkmals Kombination des Anspruchs 1 wird erreicht, daß beim Entwässerungsvorgang in der Blattbildungszone Bereiche großer Entwässerungsgeschwindigkeit und Bereiche kleiner Entwässerungsgeschwindigkeit entstehen. Dadurch wird eine Tissuebahn mit zonal unterschiedlichen Faseranteilen erzeugt, wodurch die Wasseraufnahme der Bahn erhöht wird und diese auch schneller vor sich geht. Dies beeinflußt die Tissuebahn nicht nur an der Blattoberfläche, sondern über das gesamte Blattvolumen, wodurch sich die Qualitätsparameter erheblich verbessern.Due to the combination of features of
Bei konventionellen Pressensystemen werden die Bereiche mit zonal hohem Volumen stark komprimiert, da bei solchen Systemen Druckwerte im Press-Nip entstehen, die oftmals zu hoch sind um die voluminöse Struktur aufrechtzuerhalten.In conventional press systems, the zones of high zonal volume are highly compressed because such systems create pressure levels in the press nip that are often too high to maintain the voluminous structure.
Siebe zonal unterschiedlicher Durchlässigkeit sind beispielsweise aus der SE 427053 bekannt. Danach können die betreffenden Siebe z.B. aus einem Gewebe bestehen, in dem in einer oder in mehreren Ebenen vorgesehene Längs- und Querfäden entsprechend einem vorgebbaren Muster so miteinander verwoben sind, daß sich systematisch verteilte Bereiche geeigneter Größe ergeben, in denen die Anzahl von Kreuzungsstellen gleich Null oder deutlich kleiner ist als in der Webstruktur des restlichen Gewebes.Sieves zonal different permeability are known for example from SE 427053. Thereafter, the sieves in question, for example, consist of a fabric in which provided in one or more levels longitudinal and transverse threads are interwoven according to a predetermined pattern so that systematically distributed areas of suitable size arise in which the number of crossing points equal to zero or significantly smaller than in the weave structure of the remaining fabric.
Bei einer besonders vorteilhaften Ausführungsform der erfindungsgemäßen Maschine ist wenigstens ein Entwässerungssieb mit zonal unterschiedlicher Siebdurchlässigkeit im initialen Entwässerungsbereich vorgesehen, in dem die höchsten Entwässerungsraten (Liter/min) auftreten.In a particularly advantageous embodiment of the machine according to the invention, at least one dewatering screen with zonal different screen permeability in the initial drainage area is provided in which the highest dewatering rates (liters / min) occur.
Der vorteilhafte Effekt wirkt sich insbesondere bei höheren Entwässerungsgeschwindigkeiten aus, die mit größer werdender Maschinengeschwindigkeit entsprechend höher werden. So ist es von Vorteil, wenn die Entwässerung bei einer Maschinengeschwindigkeit durchgeführt wird, die größer als etwa 1300 m/min, insbesondere größer als etwa 1500 m/min und vorzugsweise größer als etwa 1800 m/min ist.The advantageous effect is particularly effective at higher dewatering rates, which are correspondingly higher with increasing machine speed. Thus, it is advantageous if the dewatering is carried out at a machine speed greater than about 1300 m / min, in particular greater than about 1500 m / min and preferably greater than about 1800 m / min.
Eine bevorzugte praktische Ausführungsform der erfindungsgemäßen Maschine umfaßt einen Former mit zwei umlaufenden endlosen Entwässerungsbändern, die unter Bildung eines Stoffeinlaufspaltes zusammenlaufen und anschließend über ein Formierelement wie insbesondere eine Formierwalze geführt sind, wobei als nicht mit dem Formierelement in Kontakt tretendes Außenband und/oder als Innenband ein Entwässerungssieb mit zonal unterschiedlicher Siebdurchlässigkeit vorgesehen ist.A preferred practical embodiment of the machine according to the invention comprises a former with two continuous endless dewatering belts, which converge to form a material inlet gap and then passed over a forming element such as in particular a forming roller, as outer band not coming into contact with the forming element and / or as inner band Drainage sieve with zonal different Siebdurchlässigkeit is provided.
Gemäß einer zweckmäßigen Ausführungsform kann als Former beispielsweise ein Doppelsiebformer vorgesehen sein. Dabei kann als Außenband und/oder als Innenband ein Entwässerungssieb mit zonal unterschiedlicher Siebdurchlässigkeit, d.h. ein sogenanntes DSP-Sieb vorgesehen sein. Ist lediglich eines der beiden Bänder durch ein solches DSP-Sieb gebildet, so kann das andere Band ein herkömmliches Entwässerungssieb für Tissue sein.According to an advantageous embodiment may be provided as a former, for example, a twin-wire former. In this case, a drainage sieve with zonal different sieve permeability, ie a so-called DSP sieve may be provided as outer band and / or as inner band. If only one of the two bands is formed by such a DSP screen, the other band may be a conventional tissue dewatering screen.
Bei einer zweckmäßigen alternativen Ausführungsform ist als Former ein Crescentformer vorgesehen, dessen Außenband durch ein Entwässerungssieb mit zonal unterschiedlicher Siebdurchlässigkeit und dessen Innenband durch ein Filzband gebildet ist.In an expedient alternative embodiment, a crescent former is provided as a former, whose outer band is formed by a dewatering screen with zonal different screen permeability and the inner band by a felt belt.
Die größte Ausdehnung der Fläche der Teilbereiche des Entwässerungssiebes mit zonal unterschiedlicher Siebdurchlässigkeit ist zweckmäßigerweise Az < 5 mm, vorzugsweise Az < 3 mm.The largest extent of the area of the subsections of the dewatering sieve with zonal different sieve permeability is expediently Az <5 mm, preferably Az <3 mm.
Von Vorteil ist auch, wenn das Entwässerungssieb zonal unterschiedlicher Siebdurchlässigkeit nicht mit filzähnlichen Fasern benadelt ist, sondern aus einem durch Schuß- und Kettfäden gebildeten Gewebe, d.h. nur aus Schuß- und Kettfäden besteht.It is also advantageous if the dewatering screen of zonal different Siebdurchlässigkeit is not needled with felt-like fibers, but from a weft and warp formed fabric, i. consists only of weft and warp threads.
Die Zonen unterschiedlicher Siebdurchlässigkeit eines betreffenden Entwässerungsbandes sind vorteilhafterweise durch die Verwendung von Webfäden unterschiedlichen Durchmessers und/oder unterschiedlichen Webmusters erzeugt.The zones of different Siebdurchlässigkeit a respective dewatering belt are advantageously generated by the use of weaving threads of different diameters and / or different weave pattern.
Vorteilhafterweise wird das Entwässerungssieb mit zonal unterschiedlicher Siebdurchlässigkeit in einem Bereich, in dem der Trockengehalt der Tissuebahn kleiner als etwa 20 % und insbesondere kleiner als etwa 12 % ist, und vorzugsweise im initialen Blattbildungsbereich bei einem Trokkengehalt kleiner als etwa 6 % eingesetzt.Advantageously, the dewatering screen with zonal different screen permeability is used in a range in which the dry content of the tissue web is less than about 20% and in particular less than about 12%, and preferably in the initial sheet forming area at a dry content of less than about 6%.
Da aufgrund der unterschiedlichen Durchlässigkeit Fasern in das Volumen des Siebes eindringen und sich dort festsetzen können, ist dem Entwässerungssieb zonal unterschiedlicher Siebdurchlässigkeit vorzugsweise eine Konditioniereinrichtung wie insbesondere eine Siebreinigungseinrichtung zugeordnet. Dabei können z.B. Spritzrohre mit über die Maschinenbreite verteilten Düsen vorgesehen sein. Es kann jedoch beispielsweise auch ein "Duocleaner" der Firma Voith Sulzer mit rotierenden Hochdruckdüsen und integrierter Absaugung oder ein "Jet Cleaner" der Firma Voith Sulzer verwendet werden.Since fibers can penetrate into the volume of the screen due to the different permeability and can settle there, the drainage sieve zonal different Siebdurchlässigkeit is preferably associated with a conditioning device such as in particular a sieve cleaning device. In this case, for example, spray tubes can be provided with distributed over the machine width nozzles. However, it is also possible, for example, to use a "Duocleaner" from Voith Sulzer with rotating high-pressure nozzles and integrated extraction or a "Jet Cleaner" from Voith Sulzer.
Das erfindungsgemäße Verfahren ergibt sich aus den Merkmalen des Anspruchs 9.The method according to the invention results from the features of
Vorteilhafte Ausführungsformen des erfindungsgemäßen Verfahrens sind in den Unteransprüchen angegeben.Advantageous embodiments of the method according to the invention are specified in the subclaims.
Als Siebe zonal unterschiedlicher Durchlässigkeit kommen beispielsweise Siebe der Art in Frage, wie sie in der nicht vor veröffentlichten EP-A-1109970 beschrieben sind. Danach können die betreffenden Siebe insbesondere aus einem Gewebe bestehen, in dem in einer oder in mehreren Ebenen vorgesehene in einer ersten Richtung verlaufende Fäden mit in einer zweiten Richtung verlaufenden Fäden so miteinander verwoben sind, daß sich ein Gitter ergibt, das eine Vielzahl systematisch verteilter Bereiche vorgebbarer Konfiguration voneinander trennt und entsprechend festlegt, wobei die systematisch verteilten Bereiche jeweils zumindest drei in der einen und zumindest drei in der anderen Richtung verlaufende Fäden umfaßt. Bei den Fäden kann es sich insbesondere um Schußfäden und um Kettfäden handeln.As sieves zonal different permeability, for example, sieves of the type in question, as described in the not previously published EP-A-1109970. Thereafter, the screens in question may in particular consist of a woven fabric in which threads in one or more planes extending in a first direction are interwoven with threads extending in a second direction to form a grid comprising a plurality of systematically distributed portions predetermined system configuration separates and determines accordingly, the systematically distributed areas each comprise at least three in one and at least three extending in the other direction threads. The threads may in particular be weft threads and warp threads.
Die Erfindung wird im folgenden anhand von Ausführungsbeispielen unter Bezugnahme auf die Zeichnung näher erläutert; in dieser zeigen:
Figur 1- eine schematische Darstellung eines Crescentformers, bei dem als Außenband ein Entwässerungssieb mit zonal unterschiedlicher Siebdurchlässigkeit und als Innenband ein Filzband vorgesehen ist, und
Figur 2- ein Webmusterdiagramm eines sich wiederholenden Abschnitts eines durch ein Gewebe gebildeten Entwässerungssiebes mit zonal unterschiedlicher Siebdurchlässigkeit.
- FIG. 1
- a schematic representation of a Crescentformers, in which a drainage wire with zonal different Siebdurchlässigkeit and as inner band a felt belt is provided as outer band, and
- FIG. 2
- a weave pattern diagram of a repeating portion of a dewatering screen formed by a tissue with zonal different Siebdurchlässigkeit.
Der in der Figur 1 gezeigte Former 10 ist Teil einer Maschine zur Herstellung einer Tissuebahn 12. Dabei ist im Formierbereich, vorzugsweise im initialen Entwässerungsbereich, wenigstens ein Entwässerungssieb mit zonal unterschiedlicher Siebdurchlässigkeit, d.h. ein DSP-Sieb vorgesehen.The former 10 shown in FIG. 1 is part of a machine for producing a
Der Former 10 umfasst jeweils zwei umlaufende endlose Entwässerungsbänder 14, 16, die unter Bildung eines Stoffeinlaufspaltes 18 zusammenlaufen und anschließend über ein hier durch eine Formierwalze 20 gebildetes Formierelement geführt sind.The former 10 comprises in each case two circulating
In den Stoffeinlaufspalt 18 wird mittels eines Stoffauflaufs 22 die Faserstoffsuspension eingebracht.In the
Figur 1 zeigt in schematischer Darstellung einen Crescentformer 10, bei dem als nicht mit der Formierwalze 20 in Kontakt tretendes Außenband 16 ein Entwässerungssieb mit zonal unterschiedlicher Siebdurchlässigkeit, d.h. ein sogenanntes DSP-Sieb, vorgesehen ist. Das Innenband 14 ist hier durch ein Filzband gebildet. Dem DSP-Sieb 16 kann eine Konditioniereinrichtung 50 wie insbesondere eine Siebreinigungseinrichtung zugeordnet sein.Figure 1 shows schematically a crescent former 10 in which
Die sich bildende Tissuebahn 12 wird im Anschluß an die Formierwalze 20 gemeinsam mit dem Innenband 14 einem verlängerten Preßspalt 52 zugeführt, der zwischen einem Tissue-Trockenzylinder oder Yankee-Zylinder 54 und einer Schuhpreßeinheit, hier einer Schuhpreßwalze 56, gebildet ist. In Bandlaufrichtung L vor dem verlängerten Preßspalt 52 ist das die Tissuebahn 12 führende Innenband 14 über eine besaugte Einrichtung, hier eine Saugwalze 58, geführt.The forming
Dem Yankee-Zylinder 54 kann eine Trockenhaube 60 zugeordnet sein.The Yankee
Die jeweiligen Entwässerungssiebe mit zonal unterschiedlicher Siebdurchlässigkeit können beispielsweise aus einem durch Schuß- und Kettfäden gebildeten Gewebe bestehen. Dabei können die Zonen unterschiedlicher Siebdurchlässigkeit beispielsweise durch die Verwendung von Webfäden unterschiedlichen Durchmessers und/oder unterschiedlichen Webmusters erzeugt sein.The respective dewatering screens with zonal different Siebdurchlässigkeit can for example consist of a tissue formed by weft and warp threads. In this case, the zones of different screen permeability can be produced, for example, by the use of woven threads of different diameters and / or different weave patterns.
Als Siebe zonal unterschiedlicher Durchlässigkeit kommen beispielsweise Siebe der Art in Frage, wie sie in der nicht vor veröffentlichten EP-A-1109970 beschrieben sind. Danach können die betreffenden Siebe insbesondere aus einem Gewebe bestehen, in dem in einer oder in mehreren Ebenen vorgesehene in einer ersten Richtung verlaufende Fäden mit in einer zweiten Richtung verlaufenden Fäden so miteinander verwoben sind, daß sich ein Gitter ergibt, das eine Vielzahl systematisch verteilter Bereiche vorgebbarer Konfiguration voneinander getrennt und entsprechend festlegt, wobei die systematisch verteilten Bereiche jeweils zumindest drei in der einen und zumindest drei in der anderen Richtung verlaufende Fäden umfaßt. Bei den Fäden kann es sich insbesondere um Schußfäden und um Kettfäden handeln.As sieves zonal different permeability, for example, sieves of the type in question, as described in the not previously published EP-A-1109970. Thereafter, the screens in question may in particular consist of a woven fabric in which threads in one or more planes running in a first direction are interwoven with threads extending in a second direction so as to form a grid comprising a plurality of systematically distributed portions specifiable configuration separated and determined accordingly, the systematically distributed areas each comprise at least three in one and at least three extending in the other direction threads. The threads may in particular be weft threads and warp threads.
Figur 2 zeigt rein beispielhaft ein Webmusterdiagramm eines sich wiederholenden Abschnitts einer möglichen Ausführungsform eines durch ein solches Gewebe gebildeten Entwässerungssiebes mit zonal unterschiedlicher Siebdurchlässigkeit. Das sich wiederholende Webmusterdiagramm umfaßt beim vorliegenden Ausführungsbeispiel zehn Kettfäden und zehn Schußfäden. Im Bereich der schraffierten Quadrate liegt der jeweilige Schußfaden unterhalb des jeweiligen Kettfadens. Dagegen liegt im Bereich der hellen Quadrate der jeweilige Schußfaden oberhalb des jeweiligen Kettfadens. Je nach den jeweiligen Gegebenheiten kann die eine oder auch die andere Seite des Webmusterdiagramms außen liegen.FIG. 2 purely by way of example shows a weave pattern diagram of a repeating section of a possible embodiment of a drainage sieve formed by such a fabric with zonal different permeability. The repeating weave pattern diagram in the present embodiment includes ten warp threads and ten Wefts. In the area of hatched squares, the respective weft thread is below the respective warp thread. By contrast, in the area of the light squares, the respective weft thread lies above the respective warp thread. Depending on the particular circumstances, one or the other side of the weave pattern diagram may be outside.
Die schraffierten Bereiche bilden ein Gitter 62, durch das schließlich eine Vielzahl systematisch verteilter Bereiche 64 vorgebbarer Konfiguration voneinander getrennt und entsprechend festgelegt werden.The hatched areas form a
- 1010
- Formermolder
- 1212
- Tissuebahntissue web
- 1414
- Entwässerungsband, InnenbandDrainage tape, inner band
- 1616
- Entwässerungsband, AußenbandDrainage tape, outer band
- 1818
- StoffeinlaufspaltStock inlet gap
- 2020
- Formierwalzeforming roll
- 2222
- Stoffauflaufheadbox
- 2424
- Umlenkwalzedeflecting
- 2626
- Umlenkwalzedeflecting
- 2828
- Umlenkwalzedeflecting
- 3030
- Umlenkwalzedeflecting
- 3232
- wasserdichtes Bandwaterproof band
- 3434
- Schuhpresseshoe press
- 3636
- Schuhpreßeinheitshoe press
- 3838
- Gegenwalzebacking roll
- 4040
- Unterfilzbottom felt
- 4242
- Umlenkwalzedeflecting
- 4444
- Umlenkwalzedeflecting
- 4646
- ÜbergabewalzeTransfer roll
- 4848
- Tissue-Zylinder, Yankee-ZylinderTissue cylinder, Yankee cylinder
- 5050
- Konditioniereinrichtungconditioning device
- 5252
- verlängerter Preßspaltextended press nip
- 5454
- Tissue-Zylinder, Yankee-Zylinder,Tissue cylinder, Yankee cylinder,
- 5656
- Schuhpreßwalzeshoe press
- 5858
- Saugwalzesuction roll
- 6060
- TrockenhaubeTrockenhaube
- 6262
- Gittergrid
- 6464
- BereichArea
- LL
- BandlaufrichtungTape direction
Claims (17)
- Machine for manufacturing a tissue web (12), having a forming region comprising at least one circulating endless dewatering fabric (14, 16) with a fabric permeability that is different zone by zone, there being a press nip for the tissue web (12), which is formed by a shoe press unit (56) and an opposing roll (54), characterized in that the opposing roll (54) is constructed as a Yankee drying cylinder.
- Machine according to Claim 1, characterized in that at least one dewatering fabric (14, 16) with a fabric permeability that is different zone by zone is provided in the initial dewatering region.
- Machine according to Claim 1 or 2, characterized in that it comprises a former (10) having two circulating endless dewatering belts (14, 16) which run together, forming a stock inlet gap (18), and are then led over the forming element (20), such as in particular a forming roll, and in that a dewatering fabric with a fabric permeability that is different zone by zone is provided as an outer belt (16) which does not come into contact with the forming element (20) and/or as an inner belt (14).
- Machine according to Claim 3, characterized in that the former (10) provided is a twin-wire former.
- Machine according to Claim 3, characterized in that the former (10) provided is a crescent former, of which the outer belt (16) is formed by a dewatering fabric with a fabric permeability that is different zone by zone and of which the inner belt (14) is formed by a felt.
- Machine according to one of the preceding claims, characterized in that at least one dewatering fabric (14, 16) having a fabric permeability that is different zone by zone is provided and consists of a fabric formed by weft and warp threads.
- Machine according to Claim 6, characterized in that the zones of different fabric permeability of the dewatering belt (14, 16) are produced by using weaving threads of different diameter and/or different web pattern.
- Machine according to one of the preceding claims, characterized in that the dewatering fabric (16) having a fabric permeability that is different zone by zone is assigned a conditioning device (50) such as in particular a fabric cleaning device.
- Method for manufacturing a tissue web (12) by means of a tissue machine having a forming region comprising at least one circulating endless dewatering fabric (14, 16) with a fabric permeability that is different zone by zone, the tissue web (12) being led through a press nip (52) which is formed by a shoe press unit (56) and an opposing roll (54) constructed as a Yankee drying cylinder.
- Method according to Claim 9, characterized in that the dewatering is carried out at a machine speed which is higher than about 1300 m/min, in particular higher than about 1500 m/min and preferably higher than about 1800 m/min.
- Method according to Claim 9 or 10, characterized in that at least one dewatering fabric (14, 16) having a fabric permeability that is different zone by zone is used in the initial dewatering region.
- Method according to one of the preceding Claims 9 to 11, characterized in that use is made of a former (10) having two circulating endless dewatering belts (14, 16) which run together, forming a stock inlet gap (18), and are then led over a forming element (20), such as in particular a forming roll, and in that a dewatering fabric with a fabric permeability that is different zone by zone is used as an outer belt (16) which does not come into contact with the forming element and/or as an inner belt (14).
- Method according to Claim 12, characterized in that the former (10) used is a twin-wire former.
- Method according to Claim 12, characterized in that the former (10) used is a crescent former, of which the outer belt (16) is formed by a dewatering fabric with a fabric permeability that is different zone by zone and of which the inner belt (14) is formed by a felt.
- Method according to one of the preceding Claims 9 to 14, characterized in that at least one dewatering fabric (14, 16) having a fabric permeability that is different zone by zone is used and consists of a fabric formed by weft and warp threads.
- Method according to one of the preceding Claims 9 to 15, characterized in that the zones of different fabric permeability of the at least one dewatering fabric (14, 16) used are produced by using weaving threads of different diameter and/or different web pattern.
- Method according to one of the preceding Claims 9 to 16, characterized in that the dewatering fabric (14, 16) having a fabric permeability that is different zone by zone is used in a region in which the dryness of the tissue web (12) is less than about 20% and in particular less than about 12%, and preferably in the initial sheet forming region at a dryness of less than about 6%.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10003684 | 2000-01-28 | ||
| DE10003684A DE10003684A1 (en) | 2000-01-28 | 2000-01-28 | Machine and method for producing a tissue web |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP1120491A2 EP1120491A2 (en) | 2001-08-01 |
| EP1120491A3 EP1120491A3 (en) | 2001-11-14 |
| EP1120491B1 true EP1120491B1 (en) | 2006-06-21 |
Family
ID=7629015
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP00127612A Expired - Lifetime EP1120491B1 (en) | 2000-01-28 | 2000-12-16 | Machine and method for manufacturing a tissue web |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US6841037B2 (en) |
| EP (1) | EP1120491B1 (en) |
| AT (1) | ATE331075T1 (en) |
| BR (1) | BR0100430B1 (en) |
| CA (1) | CA2332725C (en) |
| DE (2) | DE10003684A1 (en) |
| PL (1) | PL196892B1 (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10325687A1 (en) * | 2003-06-06 | 2004-12-23 | Voith Paper Patent Gmbh | Sealing device for a paper machine |
| US7381296B2 (en) * | 2004-11-03 | 2008-06-03 | Kimberly-Clark Worldwide, Inc. | Method of forming decorative tissue sheets |
| US7624765B2 (en) * | 2004-12-23 | 2009-12-01 | Kimberly-Clark Worldwide, Inc. | Woven throughdrying fabric having highlighted design elements |
| AU2006244427B2 (en) * | 2005-05-05 | 2010-05-13 | Astenjohnson, Inc. | Bulk enhancing forming fabrics |
| DE102006062237A1 (en) * | 2006-12-22 | 2008-06-26 | Voith Patent Gmbh | Machine for producing a fibrous web |
| US20110139391A1 (en) * | 2009-12-10 | 2011-06-16 | James Albertus Anema | Transfer apparatus |
| US8557085B1 (en) * | 2012-07-10 | 2013-10-15 | Pmt Italia S.P.A. | Dryer apparatus for drying a web |
| SE1350254A1 (en) * | 2013-03-04 | 2014-09-05 | Valmet Aktiebolag | Press section for maximum dry content |
| RU2696333C1 (en) | 2015-07-31 | 2019-08-01 | Дзе Проктер Энд Гэмбл Компани | Packing of absorbent articles using molded non-woven material |
| CA2991934C (en) * | 2015-07-31 | 2020-01-07 | The Procter & Gamble Company | Forming belt for shaped nonwoven |
| AT517330B1 (en) * | 2015-10-06 | 2017-01-15 | Andritz Ag Maschf | METHOD FOR PRODUCING A FIBROUS WEB |
| SI3239378T1 (en) | 2016-04-29 | 2019-06-28 | Reifenhaeuser Gmbh & Co. Kg Maschinenfabrik | Device and method for the manufacture of material from continuous filaments |
| DE102021121504A1 (en) | 2021-08-19 | 2023-02-23 | Voith Patent Gmbh | Machine and method for making a tissue web |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998055691A1 (en) * | 1997-06-06 | 1998-12-10 | The Procter & Gamble Company | Method of wet pressing tissue paper |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3322617A (en) * | 1964-05-22 | 1967-05-30 | Dexter Corp | Paper making apparatus to form paper with a simulated woven texture |
| FI770610A (en) * | 1977-02-24 | 1978-08-25 | Valmet Oy | TISSUEPAPPERSMASKIN |
| DE3600530A1 (en) * | 1986-01-10 | 1987-07-16 | Wangner Gmbh Co Kg Hermann | USE OF A PAPER MACHINE TREATMENT FOR THE PRODUCTION OF TISSUE PAPER OR POROESE FLEECE AND THEREFORE SUITABLE PAPER MACHINE TENSIONING |
| US4967805A (en) * | 1989-05-23 | 1990-11-06 | B.I. Industries, Inc. | Multi-ply forming fabric providing varying widths of machine direction drainage channels |
| US5211815A (en) * | 1989-10-30 | 1993-05-18 | James River Corporation | Forming fabric for use in producing a high bulk paper web |
| US6136146A (en) * | 1991-06-28 | 2000-10-24 | The Procter & Gamble Company | Non-through air dried paper web having different basis weights and densities |
| US5225042A (en) * | 1991-12-02 | 1993-07-06 | Beloit Technologies, Inc. | Twin wire paper forming section with heated air pressure domes |
| DE4224730C1 (en) * | 1992-07-27 | 1993-09-02 | J.M. Voith Gmbh, 89522 Heidenheim, De | Tissue paper mfg. machine preventing moisture return - comprises shoe press for press unit(s) for drying tissue web, for min. press units |
| TW244342B (en) * | 1992-07-29 | 1995-04-01 | Procter & Gamble | |
| US5411636A (en) * | 1993-05-21 | 1995-05-02 | Kimberly-Clark | Method for increasing the internal bulk of wet-pressed tissue |
| SE501332C2 (en) * | 1993-05-27 | 1995-01-16 | Valmet Karlstad Ab | Ways to form a tissue paper web |
| DE4327601C1 (en) * | 1993-08-17 | 1995-01-05 | Voith Gmbh J M | Device for cleaning a circulating wire (fabric) |
| CA2142805C (en) * | 1994-04-12 | 1999-06-01 | Greg Arthur Wendt | Method of making soft tissue products |
| US6203663B1 (en) * | 1995-05-05 | 2001-03-20 | Kimberly-Clark Worldwide, Inc. | Decorative formation of tissue |
| DE19654198A1 (en) * | 1996-12-23 | 1998-06-25 | Voith Sulzer Papiermasch Gmbh | Machine for the production of a fibrous web |
| DE19732879C2 (en) | 1997-07-30 | 1999-07-22 | Sca Hygiene Prod Gmbh | Multi-layer screen for the wet area of a paper machine and the product made with it |
| US6237644B1 (en) * | 1998-09-01 | 2001-05-29 | Stewart Lister Hay | Tissue forming fabrics |
| DE19924293A1 (en) * | 1999-05-27 | 2000-12-07 | Sca Hygiene Prod Gmbh | Tissue paper machine, tissue paper produced therewith and method for producing such tissue paper |
-
2000
- 2000-01-28 DE DE10003684A patent/DE10003684A1/en not_active Withdrawn
- 2000-12-16 DE DE50013045T patent/DE50013045D1/en not_active Expired - Lifetime
- 2000-12-16 EP EP00127612A patent/EP1120491B1/en not_active Expired - Lifetime
- 2000-12-16 AT AT00127612T patent/ATE331075T1/en active
-
2001
- 2001-01-18 PL PL345233A patent/PL196892B1/en not_active IP Right Cessation
- 2001-01-24 BR BRPI0100430-1A patent/BR0100430B1/en not_active IP Right Cessation
- 2001-01-26 US US09/769,464 patent/US6841037B2/en not_active Expired - Fee Related
- 2001-01-26 CA CA002332725A patent/CA2332725C/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998055691A1 (en) * | 1997-06-06 | 1998-12-10 | The Procter & Gamble Company | Method of wet pressing tissue paper |
Also Published As
| Publication number | Publication date |
|---|---|
| PL345233A1 (en) | 2001-07-30 |
| BR0100430A (en) | 2001-09-11 |
| US6841037B2 (en) | 2005-01-11 |
| CA2332725A1 (en) | 2001-07-28 |
| PL196892B1 (en) | 2008-02-29 |
| DE10003684A1 (en) | 2001-08-02 |
| CA2332725C (en) | 2009-06-16 |
| BR0100430B1 (en) | 2010-05-04 |
| EP1120491A2 (en) | 2001-08-01 |
| DE50013045D1 (en) | 2006-08-03 |
| US20010010260A1 (en) | 2001-08-02 |
| ATE331075T1 (en) | 2006-07-15 |
| EP1120491A3 (en) | 2001-11-14 |
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