EP1778913A1 - Machine et procede pour produire une bande de matiere fibreuse a volume augmente - Google Patents

Machine et procede pour produire une bande de matiere fibreuse a volume augmente

Info

Publication number
EP1778913A1
EP1778913A1 EP05779840A EP05779840A EP1778913A1 EP 1778913 A1 EP1778913 A1 EP 1778913A1 EP 05779840 A EP05779840 A EP 05779840A EP 05779840 A EP05779840 A EP 05779840A EP 1778913 A1 EP1778913 A1 EP 1778913A1
Authority
EP
European Patent Office
Prior art keywords
fibrous web
press
belt
band
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.)
Withdrawn
Application number
EP05779840A
Other languages
German (de)
English (en)
Inventor
Susanne Berger
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 EP1778913A1 publication Critical patent/EP1778913A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses

Definitions

  • the invention relates to a machine for producing a paper or another fibrous web.
  • a press section for a paper machine has two pressing points, which are each formed by a press roller cooperating with a shoe press roll.
  • a first upper felt, the paper web coming from a forming wire, an underfelt and a press jacket of a first shoe press roll pass through the first press point.
  • the underfelt continues with the paper web to the second press site. Together with a second top felt and a press jacket of a second press site, the paper web then passes through the second press site.
  • the paper web follows the underfelt further up to a take-off roll, through which it is transferred to a first dryer wire which transfers the paper web to the dryer section.
  • Guide rollers and suction rollers are provided for deflecting the upper felt and the lower felt.
  • the volume of the paper for a given smoothness for example, according to the Bendtsen measurement method is less than 200 ml / min, a quality feature, the maintenance of high-speed paper machines and high dry conditions problems prepares. For speeding up after passing through the press section required high dry contents lead to an undesirable reduction of the specific volume.
  • this object is achieved in a machine of the type mentioned above in that an elastically stretchable in its length band is provided, wherein the fibrous web in the stretched state of the band is zugeperbar the band and then the band is relaxed with applied fibrous web, so that the fibrous web is compressed and wherein the adhesion forces between the fibrous web and the band are sufficiently high that wrinkling of the compressed fibrous web is avoided.
  • an infinitesimal compression of the paper web is achieved on the carrier material over which it is guided.
  • the paper web is first transported on a felt and then onto an elastic band, i. H. a screen, a felt or a transfer belt, transferred, which is stretched.
  • the tensioned band is relieved, so that a compression of the paper web occurs.
  • the band is advantageously designed such that the high adhesion forces that exist between the fibrous web and the belt prevents wrinkling in the paper web and ensures an infinitesimal compression.
  • a particular advantage of the invention is thus the gain in volume without a disproportionate increase in basis weight.
  • stretching and unloading of the strip is combined with a dewatering step therebetween.
  • the drainage can be done at different points of the machine, for example. In the press section or the dryer section. In this procedure, a particularly high volume gain is achieved.
  • the strip is advantageously extensible before or during passage through the first press nip and can be relaxed after passing through the last press nip, with the fibrous web being brought together with the band before or in the first press nip.
  • the tape is stretched before or in the first press nip then the fibrous web is drained once or more times when passing through Pressnips and subsequently the band is relieved again.
  • the machine has at least one press section with one or more press nips, it is conceivable to stretch the strip before passing through a press nip and to relieve it after passing through the same press nip and to bring the fibrous web together with the strip before or in the press nip.
  • a deflection roller is present, which is drivable at lower Geschwiability than the first and the second pressure roller, which together form the press nip through which the fibrous web together with the tape is passed.
  • the difference in speed between the press rolls on the one hand and the deflecting roll immediately preceding them is based on the fact that the press rolls are driven at a speed which is higher than that of the deflecting roll.
  • the second belt is a conveyor belt for transferring the fibrous web to a third belt, through which the fibrous web can be guided by a subsequent dryer section to the press section.
  • the invention also relates to a method for operating a machine for producing a paper or another fibrous web, comprising the following steps:
  • the method for operating the machine is characterized in that the fibrous web is pressed on the transfer of the tape, for example, to improve the smoothness of a subsequent conveyor belt.
  • the fibrous web is compressed by less than 5%, in particular by less than 3%.
  • Fig. 1 a, b are schematic sectional views of the fibrous web before and after the
  • FIG. 2 shows a fibrous web, which is guided by a press nip
  • FIG. 3 shows a press section with a central roller forming two press nips
  • Fig. 4 shows a press section with a two press nips forming central roller in conjunction with a part of a dryer section and
  • Fig. 5 shows a press section with two press nips, each of individual
  • Press roll pairs are formed, wherein the second press nip is formed by a press roll with a shoe press roll.
  • a fibrous web 1 coming from a wire section, passed through a press section. In this it is passed through at least one press nip.
  • the fibrous web 1 is applied to an elastic band 2, which is in an expanded state before passing through the press nip.
  • the stretching of the strip 2 is canceled by, for example, a deflection roller arranged downstream of the press rolls in the web running direction is operated at a lower jacket speed.
  • the fibrous web 1 is compressed.
  • the thickness D Figure 1 b.
  • Fig. 2 shows schematically one of a press roll 3 and a (not Press nip formed by the press fabric, through which the fibrous web 1 is passed together with two bands or felts 4, 5.
  • a fibrous web 6 (FIG. 3) is transferred from a wire section 7 to a felt 54 and guided to the press section 8.
  • it is first passed through a press nip 51 formed by rollers 10 and 50 and then through two press nips 12, 13 formed by a central roller 9 with two press rollers 10, 11.
  • the press nip 51 the fibrous web 6 is guided together with the felt 54 and an elastic band.
  • the elastic band 14 is supplied only in the press nip 51 of the fibrous web. The band 14 is not stretched before the press nip 51 but in the press nip 51 itself by pressure load.
  • the band 14 i here in the thickness so flexible that at a pressure load within the press nip 51, the thickness reduction is associated with an elongation of the belt 14.
  • the relaxation of the belt 14 after passage of the press nips 51 leads in addition to the expansion in the thickness direction to a reduction in length and an associated compression of the belt 14 and adhering thereon fibrous web 6.
  • the fibrous web 6 passes through the Pressni ps 12, 13, which by the central roller 9 and the rollers 10 and 11 are formed.
  • a fibrous web 17 coming from a wire section is transferred via a lower felt 18 into a press section 19 with a central roller 20.
  • an application for example of starch
  • an air-permeable belt 26 is applied to an air-permeable belt 26 via a device 25.
  • This is heated together with the fibrous web 17 transported by it from both sides or at least from a single side, in particular from the top, by drying devices 27, 28 and dried.
  • the upper drying device 28 generates hot air, while the lower drying device 27 is, for example, a radiation dryer.
  • both drying devices 27, 28 are radiation dryers.
  • the use of an air-permeable belt 26 has the advantage that it can be dried through it.
  • a conditioning device 30 is employed. For example, a cleaning agent is applied by spraying, which is then wiped off again.
  • the belt 26 dispenses the application of the medium in the press nip 21, which is applied by the device 25, to the fibrous web 17, while it wraps around the central roll 20 together with the fibrous web 17.
  • the band 26 is also elastic, so that it first by a deflection roller 31 rotates at a lower speed than the central roller 20 and the press rollers 23, 24 is stretched and in the stretched state, the fibrous web 17 receives. After passing through the press nips 21, 22, the belt 26 is compressed again by a slower running guide roller 32 and with it also the fibrous web 17 lying on it, which at the same time receives a greater thickness and thus a larger volume.
  • the fibrous web 17 After passing through the press section 19, the fibrous web 17 is directed into a single-row drying section 33 with drying cylinders 34 and guide rollers 35 and vacuum sections 36 designed as suction rollers.
  • a negative pressure of preferably more than 5 kPa is used to allow a safe detachment of the fibrous web 17 of the drying cylinders 34, since just the acted upon with the medium side of the fibrous web 17 rests on the shell side of the drying cylinder 35.
  • a fibrous web 37 is dewatered by a press section 38 in press nips 39, 40.
  • the first press nip 39 is formed by the roller pair 52 and 53.
  • the fibrous web 37 is passed between a press roll 41 and a shoe press roll 42.
  • moisture is released to an elastic felt 43.
  • the guide rollers 44, 45, 46, 47 are each formed as driven rollers.
  • the guide roller 44 runs at a lower circumferential speed than the press roller 41 and the shoe press roller 42, so that the felt 43 is stretched when it receives the fibrous web 37 from a top felt 48 before the press nip 40.

Landscapes

  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)

Abstract

L'invention concerne une machine servant à produire une bande (1, 6, 17, 37) de papier ou d'une autre matière fibreuse et comprenant une courroie (14, 26, 43). La machine selon l'invention est caractérisée en ce que la courroie (14, 26, 43) est extensible élastiquement dans sa longueur, la bande de matière fibreuse (1, 6, 17, 37) pouvant être amenée à la courroie (14, 26, 43) alors que cette dernière est étirée. La courroie (14, 26, 43) sur laquelle est posée la bande de matière fibreuse (1, 6, 17, 37) peut ensuite être détendue de sorte que la bande de matière fibreuse (1, 6, 17, 37) est comprimée. Les forces d'adhésion entre la bande de matière fibreuse (1, 6, 17, 37) et la courroie (14, 26, 43) sont suffisamment élevées pour éviter un plissement de la bande de matière fibreuse comprimée (1, 6, 17, 37).
EP05779840A 2004-08-20 2005-08-05 Machine et procede pour produire une bande de matiere fibreuse a volume augmente Withdrawn EP1778913A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004040425A DE102004040425A1 (de) 2004-08-20 2004-08-20 Maschine zur Herstellung einer Faserstoffbahn und Verfahren zum Stauchen der Faserstoffbahn
PCT/EP2005/053875 WO2006021500A1 (fr) 2004-08-20 2005-08-05 Machine et procede pour produire une bande de matiere fibreuse a volume augmente

Publications (1)

Publication Number Publication Date
EP1778913A1 true EP1778913A1 (fr) 2007-05-02

Family

ID=35295337

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05779840A Withdrawn EP1778913A1 (fr) 2004-08-20 2005-08-05 Machine et procede pour produire une bande de matiere fibreuse a volume augmente

Country Status (6)

Country Link
US (1) US20070267161A1 (fr)
EP (1) EP1778913A1 (fr)
JP (1) JP2008510892A (fr)
CN (1) CN101006226A (fr)
DE (1) DE102004040425A1 (fr)
WO (1) WO2006021500A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITVE20110063A1 (it) * 2011-09-19 2013-03-20 Giorgio Trani Metodo di compensazione dimensionale di nastri di materiale fibroso.

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE516549A (fr) * 1952-06-11
US3515633A (en) * 1953-04-03 1970-06-02 Clupak Inc Compacting of paper and similar fiber webs
US3140224A (en) * 1960-05-02 1964-07-07 Beloit Iron Works Apparatus for compaction of formed sheet for improved properties
US3454463A (en) * 1966-07-12 1969-07-08 Clupak Inc Methods of making newsprint paper

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006021500A1 *

Also Published As

Publication number Publication date
US20070267161A1 (en) 2007-11-22
DE102004040425A1 (de) 2006-02-23
CN101006226A (zh) 2007-07-25
JP2008510892A (ja) 2008-04-10
WO2006021500A1 (fr) 2006-03-02

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