US20070267161A1 - Machine and Method for the Production of a Web of Fiber Material with an Increased Volume - Google Patents

Machine and Method for the Production of a Web of Fiber Material with an Increased Volume Download PDF

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Publication number
US20070267161A1
US20070267161A1 US11/660,842 US66084205A US2007267161A1 US 20070267161 A1 US20070267161 A1 US 20070267161A1 US 66084205 A US66084205 A US 66084205A US 2007267161 A1 US2007267161 A1 US 2007267161A1
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US
United States
Prior art keywords
belt
fibrous web
press
nip
machine
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.)
Abandoned
Application number
US11/660,842
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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
Assigned to VOITH PATENT GMBH reassignment VOITH PATENT GMBH ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BERGER, SUSANNE
Publication of US20070267161A1 publication Critical patent/US20070267161A1/en
Abandoned 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
    • 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 fibrous web of paper or some other material.
  • a pressing section for a paper machine is known from DE 100 22 087 A1.
  • the pressing section comprises two pressing units, each of which is formed from a press roller working in association with a shoe press roll.
  • a first upper felt runs through the first pressing station together with a paper web passing forward from a forming fabric, an under-felt and a press jacket of a first shoe press roll. Together with the under-felt, the paper web passes on to the second pressing station. Then the paper web together with a second upper-felt and a press jacket of a second pressing station runs through the second pressing station.
  • the paper web continues to follow the under-felt to a pick-up roll by means of which it is transferred to a first drying fabric which conveys the paper web to the drying section. Deflection rolls and suction rolls are provided to deflect the upper-felt and the lower-felt.
  • the very low strength of the paper web makes it necessary to provide continuous support by felts or a transfer belt.
  • this object can be achieved with a machine of the type initially mentioned by providing a belt which is elastically extensible longitudinally, it being possible for the fibrous web to be led to the belt in its elongated condition after which the belt with the superimposed fibrous web can be relaxed so that the fibrous web is compressed and the adhesive forces between the fibrous web and the belt being sufficiently great that fold formation in the compressed fibrous web is prevented.
  • an infinitesimal compression of the paper web is achieved on the support material on which it is carried.
  • the paper web is first transported on a felt and then transferred to an elastic belt, i.e. a fabric. a felt or a transfer belt which is under tension.
  • the tensioned belt is relaxed with the result that compression of the paper web takes place.
  • the belt is advantageously of such a nature that the high adhesion forces which exist between the fibrous web and the belt prevent fold formation in the paper web and ensure an infinitesimal degree of compression.
  • An increase in volume can be obtained from the infinitesimal compression of the paper web without a linear increase of substance in relation to the gain in volume.
  • a particular advantage of the invention consists, therefore, of an increase in volume without a superproportional increase in substance.
  • the elongation and relaxation of the belt are combined with an intermediate de-watering stage.
  • the de-watering can take place at different points of the machine, for example, in the pressing section or the drying section. This manner of processing achieves a particularly high gain in volume.
  • the machine possesses at least one pressing section with several press-nips it is advantageous if the belt can be elongated in front of or during its passage through the first press-nip and relaxed after passing through the last press-nip, with the fibrous web and the belt being led together in front of or within the first press-nip.
  • the belt is, therefore, elongated before or in the first press-nip and the fibrous web is de-watered once or several times as it passes through press-nips, after which the belt is again relaxed.
  • the machine possesses at least one pressing section with one or more press-nips it is conceivable to elongate the belt in front of its passage through a press-nip, to release the tension after passing through the same press-nip and to bring the fibrous web and the belt together in front of or within the press-nip.
  • the belt is so flexible in its thickness that when it is exposed to pressure in the nip the reduction in its thickness is associated with a lengthening of the belt. Relaxation of the belt leads not only to expansion in the thickness direction but to a reduction in length and a resulting compression of the belt and of the fibrous web adhering to it.
  • a deflection roll is provided before the at least one press-nip and this can be driven at a lower speed than the first and second press-rollers which together form the press-nip through which both the fibrous web and the belt are fed.
  • the difference in speed between the press rollers on the one hand and the deflection roll mounted immediately ahead of them arises from the fact that relative to the deflection roll the press rollers are driven at a higher speed.
  • a deflection roll after the at least one press-nip is provided which is driven at a lower speed than the first and second press rollers.
  • the second belt is a transport belt to transfer the fibrous web to a third belt by means of which the fibrous web can be led through a third press-nip to improve the level of smoothness.
  • the second belt is a transport belt to transfer the fibrous web to a third belt by means of which the fibrous web can be led through a drying section following the pressing section.
  • the invention also relates to a process for operating a machine for the production of a fibrous web of paper or some other material by the following steps:
  • the process for operating the machine is characterized in that when the fibrous web is transferred from the belt, for example, to improve its level of smoothness, it is pressed against a succeeding transport belt.
  • the fibrous web is compressed by less than 5% and, in particular, by less than 3%.
  • FIG. 1 a, b show schematic sectional elevations of the fibrous web before and after being compressed
  • FIG. 2 shows a fibrous web, which is fed through a press nip
  • FIG. 3 shows a pressing section with a central roller forming two press-nips
  • FIG. 4 shows a pressing section with a central roller forming two press-nips combined with a part of the drying section and
  • FIG. 5 shows a pressing section with two press-nips, each of which comprises individual pairs of press rollers where the second press-nip is formed of a press roller with a shoe press roll.
  • a fibrous web 1 ( FIG. 1 a ) passing forward from a forming section is led through a pressing section. There, it is led through at least one press-nip.
  • the fibrous web 1 is deposited upon an elastic belt 2 which finds itself in an elongated condition before it passes through the press-nip.
  • the elongation of the belt 2 is relaxed by, for example, running a deflection roll following the press rollers at a lower peripheral speed relative to the running direction of the web. In this way the fibrous web 1 is compressed. Instead of the original thickness d it has the thickness D ( FIG. 1 b ).
  • FIG. 2 shows schematically a press-nip comprising a press roller 3 and a press-shoe (not illustrated) through which the fibrous web 1 is led together with two belts or felts 4 , 5 .
  • a fibrous web 6 ( FIG. 3 ) is received on a felt 54 from a forming section 7 and led to the pressing section 8 .
  • a press-nip 51 comprising rolls 10 and 50 and then through two press-nips 12 , 13 comprising a central roll 9 with two press rollers 10 , 11 .
  • the fibrous web 6 is led through the press-nip 51 together with the felt 54 and an elastic belt.
  • the elastic belt 14 is first led through the press-nip 51 .
  • the belt 14 is not elongated ahead of the press-nip 51 but, on the contrary, within the press-nip 51 itself as a consequence of the pressure loading.
  • the belt 14 is so flexible in its thickness that when subjected to pressure loading within the press-nip 51 the reduction in thickness is associated with a lengthening of the belt 14 .
  • the relaxation of the belt 14 after its passage through the press-nip 51 leads not only to an increase in thickness but also to a reduction in length and an associated compression of the belt 14 and the fibrous web 6 adhering to it. Then the fibrous web 6 passes through the press-nips 12 , 13 formed by the central roll 9 and the rolls 10 and 11 .
  • a fibrous web 17 travelling from a forming section on an under-felt 18 is led to a pressing section 19 with a central roll 20 .
  • an application of, for example, starch carried on an air-permeable belt 26 is made by a device 25 .
  • This belt together with the fibrous web 17 transported upon it is heated and dried by drying devices 27 , 28 with heating applied to both sides or at least to one side and, in particular, to the upper side.
  • the upper drying device 28 produces hot air while the lower drying device 27 is, for example, a radiant dryer.
  • a further drying device 29 for the fibrous web 17 can be arranged in the following area of a drying fabric.
  • both drying devices 27 , 28 are radiant dryers.
  • the use of an air-permeable belt 26 has the advantage that drying can take place through it.
  • a conditioning device 30 is fitted to the belt 26 .
  • a cleaning agent can be applied by spraying which is subsequently removed by wiping.
  • the belt 26 transfers the application of the medium made by the device 25 to the fibrous web 17 while it, together with the fibrous web 17 , is wrapped around the central roll 20 .
  • the belt 26 is of an elastic nature so that firstly it is elongated by a deflection roll 31 turning at a lower speed than the central roll 20 and the press rollers 23 , 24 and it accepts the fibrous web 17 while in this elongated condition. After passing through the press-nips 21 , 22 the belt 26 is again compressed by a slower-running deflection roll 32 with similar compression of the fibrous web 17 carried upon it, which as a result simultaneously is endowed with a greater thickness and, thereby, a greater volume.
  • the fibrous web 17 After passing through the pressing section 19 the fibrous web 17 is led into a single row drying section 33 with drying cylinders 34 and deflection rolls 35 in the form of suction rolls together with low-pressure areas 36 .
  • a pressure reduction of preferably more than 5 kPa is maintained to facilitate a reliable release of the fibrous web 17 from the drying cylinders 34 because the side of the fibrous web 17 carrying the medium lies upon the peripheral face of the drying cylinders 35 .
  • a fibrous web 37 is de-watered by press-nips 39 , 40 in a pressing section 38 .
  • the first press-nip 39 is formed by the pair of rolls 52 and 53 .
  • the fibrous web 37 is led between a press roller 41 and a shoe press roll 42 .
  • moisture is given up to an elastic felt 43 .
  • the latter is led over deflection rolls 44 , 45 , 46 , 47 .
  • Each of the deflection rolls 44 , 47 are designed as driven rolls.
  • the deflection roll 44 runs at a slightly slower peripheral speed than the press roller 41 and the shoe press roll 42 with the result that the felt 43 is elongated when it receives the fibrous web 37 from an upper felt 48 before reaching the press-nip 40 .
  • the felt 43 and the fibrous web 37 carried by it After passing through the press-nip 40 the felt 43 and the fibrous web 37 carried by it is compressed because the deflection roll 47 turns with a slightly lower peripheral speed than the press roller 41 and the shoe press roll 42 .
  • the fibrous web 37 is led by the felt 43 to a drying section 49 .

Landscapes

  • Paper (AREA)
  • Treatment Of Fiber Materials (AREA)
US11/660,842 2004-08-20 2005-08-05 Machine and Method for the Production of a Web of Fiber Material with an Increased Volume Abandoned US20070267161A1 (en)

Applications Claiming Priority (3)

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
DE102004040425.9 2004-08-20
PCT/EP2005/053875 WO2006021500A1 (de) 2004-08-20 2005-08-05 Maschine und verfahren zur herstellung einer faserstoffbahn mit gesteigertem volumen

Publications (1)

Publication Number Publication Date
US20070267161A1 true US20070267161A1 (en) 2007-11-22

Family

ID=35295337

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/660,842 Abandoned US20070267161A1 (en) 2004-08-20 2005-08-05 Machine and Method for the Production of a Web of Fiber Material with an Increased Volume

Country Status (6)

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

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.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624245A (en) * 1952-06-11 1953-01-06 Cluett Peabody & Co Inc Modified paper and method for its manufacture
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
US3515633A (en) * 1953-04-03 1970-06-02 Clupak Inc Compacting of paper and similar fiber webs

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624245A (en) * 1952-06-11 1953-01-06 Cluett Peabody & Co Inc Modified paper and method for its manufacture
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

Also Published As

Publication number Publication date
WO2006021500A1 (de) 2006-03-02
CN101006226A (zh) 2007-07-25
JP2008510892A (ja) 2008-04-10
EP1778913A1 (de) 2007-05-02
DE102004040425A1 (de) 2006-02-23

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Date Code Title Description
AS Assignment

Owner name: VOITH PATENT GMBH, GERMANY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:BERGER, SUSANNE;REEL/FRAME:018983/0440

Effective date: 20070205

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION