DE102006021328A1 - dehydrator - Google Patents

dehydrator

Info

Publication number
DE102006021328A1
DE102006021328A1 DE200610021328 DE102006021328A DE102006021328A1 DE 102006021328 A1 DE102006021328 A1 DE 102006021328A1 DE 200610021328 DE200610021328 DE 200610021328 DE 102006021328 A DE102006021328 A DE 102006021328A DE 102006021328 A1 DE102006021328 A1 DE 102006021328A1
Authority
DE
Germany
Prior art keywords
fibrous web
characterized
press roll
device according
band
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Withdrawn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
DE200610021328
Other languages
German (de)
Inventor
Andreas Meschenmoser
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 DE200610021328 priority Critical patent/DE102006021328A1/en
Publication of DE102006021328A1 publication Critical patent/DE102006021328A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00Press section of machines for making continuous webs of paper
    • D21F3/02Wet presses
    • D21F3/0272Wet presses in combination with suction or blowing devices
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14Making cellulose wadding, filter or blotting paper
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/14Making cellulose wadding, filter or blotting paper
    • D21F11/145Making cellulose wadding, filter or blotting paper including a through-drying process
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F3/00Press section of machines for making continuous webs of paper
    • D21F3/02Wet presses
    • D21F3/0281Wet presses in combination with a dryer roll
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F5/00Dryer section of machines for making continuous webs of paper
    • D21F5/18Drying webs by hot air
    • D21F5/182Drying webs by hot air through perforated cylinders

Abstract

The invention relates to a device for dewatering a paper, tissue or another fibrous web (1) in a machine for producing and / or finishing the same, in which the fibrous web (1) with on both sides at least one air-permeable and endlessly circulating belt (2 , 3, 4) partially wraps around a cylindrical and rotating press roll (5).
In this case, a gentle but most effective dewatering of the fibrous web (1) should be achieved in that the press roller (5) is designed as a blower, which directs blown air in the wrap to the fibrous web (1).

Description

  • The The invention relates to a device for dewatering a paper, tissue or another fibrous web in a machine for manufacturing and / or thinning same, wherein the fibrous web with both sides at least one air permeable each and endlessly circulating belt a cylindrical and rotating press roll partially wraps around.
  • such Press arrangements are for a long time known, but the dewatering performance can not yet to satisfy. Although this can be achieved by a suction of the fibrous web be improved in the pressing area, but this is also relative energy-intensive.
  • The The object of the invention is therefore a gentle and possible effective drainage of the To enable fibrous web.
  • According to the invention was solved the task by the press roll is designed as a blow roll, which preferably name is Blasluft in Umschlingungsbereich directed to the fibrous web.
  • The Blown air causes Durchluftdrocknung the fibrous web in the wrap the press roll on very cost-effective Way, especially compressed air in such machines in sufficient Quantity available stands.
  • The Charging with hotter Blown air can further support drying.
  • During the Wrap can be over the pressure of the re the press roll outside lying press belt due to the belt tension also a Pressing force exerted on the fibrous web, causing the drainage supported.
  • there it is advantageous if the press belt in the wrap the press roller is associated with a water collecting device, which that catches the water blown by the blown air through the press belt.
  • Around while the Durchlufttrocknung still support, it is advantageous if the water collecting device is designed as a suction device. Of the Vacuum of the suction device causes the suction of additional Water from the tapes and the fibrous web in the water collecting device.
  • to warranty the water permeability and if necessary also a certain water absorption capacity should at least the, on the, the press roll opposite Side of the fibrous web extending bands as water-permeable felts or sieves be formed.
  • to Realization of a, albeit small pre-pressing should the bands before the press roll together with the fibrous web at least one guide roll entwine, which on the opposite, the press roll Side of the fibrous web is arranged. The effect of tape tension while The wrap improves with decreasing diameter the guide roller. Therefore, the diameter of the guide roll should be smaller than 800 mm.
  • It is also used to intensify drainage Advantage, if in the web running direction in front of the press roller a steam blower box is arranged, which comes into contact with the press roller Band with superheated steam applied. this leads to for heating the belt and the fibrous web and promotes so the drainage.
  • there should face the steam box opposite be arranged the guide roller.
  • Around the drainage effect while the pre-pressing still on the rise, should be the common of the volumes looped Leitwalze be designed as Saugleitwalze. The negative pressure sucks water from the tapes and the fibrous web in the guide roll.
  • There the press belt due to its high band tension pressing function, i.e. Tensile stress is exposed, it is usually advantageous if on the opposite, the press roll Side of the fibrous web at least two bands are arranged, wherein the outer one Press band forms. This allows it, the other band accordingly to the needs in terms of water permeability, Roughness, water storage capacity etc. to adapt.
  • A Simplification in terms of effort, especially in the tape guide results However, if on the, the press roll opposite side of the fibrous web only one band is arranged, which also forms the pressing band.
  • Independent of the number of bands should at least the press belt after the press roll, preferably after the route the fibrous web, a driven guide roll wrap around. Because of the high tensile strength of the press belt is to initiate the required Drive power particularly suitable.
  • In general, it is sufficient if only one band is arranged between the fibrous web and the press roll. To even out the surface of the perforated roll shell the Press roll, however, it may be advantageous if between the press roll and the belt a Siebstrumpf or a sieve is arranged.
  • Special Benefits brings with this device feasible Durchlufttrocknung in the drainage a tissue web.
  • there This results in a minimized effort and a secure web guide in particular when that is arranged between the press roll and the fibrous web Tape the fibrous web from an upstream unit, in particular a headbox to a downstream unit, in particular a drying cylinder leads.
  • Around the surface structure to influence the tissue web, it is advantageous if that between the fibrous web and the Press roll arranged band in the contact area with the fibrous web a structured surface having.
  • A Simplification of the arrangement further results when the press roll over the Fiber web is arranged. A tearing of the press belt affects so not the rest of the arrangement.
  • For the process the Durchlufttrocknung is overall essential that the blowing air by a band, in particular in the form of a structured sieve, the fibrous web and then by wengistens a tape in the form of a filter or sieve blown becomes.
  • following the invention will be explained in more detail in several embodiments. In the accompanying Drawing shows:
  • 1 a schematic cross section through a dewatering device and
  • 2 : another device.
  • In both cases, the fibrous web becomes 1 in the form of a tissue web from an air-permeable guide tape 2 starting from a headbox 11 the manufacturing machine by a dewatering device according to the invention to a large drying cylinder 12 , especially a Yankee cylinder.
  • While wrapping the drying cylinder 12 the drying takes place, so that the fibrous web 1 then removed with the help of a creping doctor and can be creped. Thereafter, the rolling up of the fibrous web takes place 1 ,
  • The dewatering device has one above the fibrous web 1 arranged, cylindrical and rotating press roll 5 , This press roll 5 is from the fibrous web 1 together with the inner leadership band 2 and at least one outer and also air and water permeable pressing band 4 entwined.
  • The press roll 5 is designed as a blower roll with a perforated roll shell and directs hot blast air during the looping in the direction of the fibrous web 1 , During this Durchlufttrocknung water from the fibrous web 1 in the band 4 and from this into one opposite the press roll 5 arranged water collecting device 6 driven.
  • To this air flow through the fibrous web 1 and the ribbons 2 . 3 . 4 to support yet is the water catcher 6 suctioned. This is located in the water collecting device 6 a perforated, transversely to the web direction 14 extending and connected to a vacuum source suction pipe 9 ,
  • The press band 4 pushes the fibrous web 1 during the wrapping of the press roll 5 as a result of the belt tension against the Führuns band 2 , leading to the extraction of water from the fibrous web 1 leads. Because of the high tensile stresses, the pressing band 4 have a correspondingly high strength. For this particular bands or sieves are suitable.
  • After the press roll 5 leads the leadership band 2 the fibrous web 1 alone to the drying cylinder 12 further. There is the fibrous web 1 from one of the leadership band 2 wrapped press roll 13 to the drying cylinder 12 pressed. Because of the smooth surface of the drying cylinder 12 remains the fibrous web 1 then adhere to this, leaving the leader band 2 can be carried away.
  • The surface of the leader tape 2 is structured so that during contact with the fibrous web 1 , in particular in the pressing of the fibrous web 1 to the press roller 5 a corresponding surface structure in the fibrous web 1 out forms.
  • At the in 1 The arrangement shown runs between the press belt 4 and the fibrous web 1 yet another air and water permeable band 3 endlessly around. This allows the press belt 4 and the band 3 in terms of its properties, such as roughness, strength, permeability, etc. better and independently to adapt to the requirements. That's why the tape is 3 usually designed as a felt or sieve in the interest of a higher water absorbency.
  • In front of the press roller 5 wraps around the press band 4 together with the band 3 , the fibrous web 1 and the guide band out here 2 a guide roll 7 , During this wrapping, there is already a pre-pressing of the fibrous web 1 ,
  • Opposite the guide roller 7 there is a steam box 8th , whose superheated steam on the guide tape 2 is directed and this band 2 and the fibrous web 1 heating up.
  • After wrapping the press roll 5 and the routing of the fibrous web 1 wraps around the press band 4 with the outside band 3 a driven guide roller 10 , Then both bands can 3 . 4 optionally conditioned and to the guide roller 7 to be led back.
  • In contrast, the fibrous web becomes 1 at the in 2 shown drainage device only from the guide band 2 and the press band 4 around the press roll 5 guided. The reduced number of bands also leads to less effort.
  • However, here is the fibrous web 1 before the wrap of the press roll 5 together with the press belt 4 and the outside guide band 2 around a guide roller 7 guided. This guide roller 7 is additionally carried out, however, sucked, so that even from this negative pressure a certain amount of water from the fibrous web 1 and / or the press belt 4 is sucked. Opposite the guide roller 7 is the steam box 8th for heating up the guide tape 2 and the fibrous web 1 ,
  • After the press roll 5 the fibrous web is running 1 together with the leadership band 2 continue, leaving the press band 4 alone a driven guide roller 10 can wrap around.
  • Likewise, with the drying cylinder 12 a press nip forming press roll 13 suctioned.
  • In both arrangements, the guide roller 7 in front of the press roll 5 a diameter of less than 800 mm, which is the effect of belt tension on the fibrous web 1 elevated.
  • The formation of the press roll 5 As a blow roll not only reduces the energy cost, it also reduces the risk of contamination in the perforation of the roll shell of the press roll 5 ,
  • As is the press band 4 under the fibrous web 1 is decreased with a tear of the band 4 as a result of the high belt tensions also the danger for the large drying cylinder 12 ,
  • 1
    Fibrous web
    2,3,4
    bands
    5
    press roll
    6
    Water collecting device
    7
    guide roll
    8th
    steam blow
    9
    suction tube
    10
    guide roll
    11
    headbox
    12
    drying cylinders
    13
    press roll
    14
    Web direction

Claims (18)

  1. Device for dewatering a paper, tissue or other fibrous web ( 1 ) in a machine for producing and / or finishing the same, in which the fibrous web ( 1 ) with on both sides at least one air-permeable and endlessly circulating band ( 2 . 3 . 4 ) a cylindrical and rotating press roll ( 5 ) partially wraps around, characterized in that the press roll ( 5 ) is designed as a blower roll, which blown air in the wrap around the fibrous web ( 1 ).
  2. Device according to claim 1, characterized in that the press roll ( 5 ) blowing air to the fibrous web ( 1 ).
  3. Apparatus according to claim 1 or 2, characterized in that, with respect to the press roll ( 5 ) external pressing band ( 4 ) in the wrap area of the press roll ( 5 ) a water collecting device ( 6 ), which, by the press belt ( 4 ) drifted water.
  4. Apparatus according to claim 3, characterized in that the water collecting device ( 6 ) is designed as a suction device.
  5. Device according to one of the preceding claims, characterized in that at least the, on the, the press roll ( 5 ) opposite side of the fibrous web ( 1 ) extending bands ( 3 . 4 ) are formed as water-permeable felts or sieves or the like.
  6. Device according to one of the preceding claims, characterized in that the bands ( 2 . 3 . 4 ) in front of the press roll ( 5 ) together with the fibrous web ( 1 ) at least one guide roller ( 7 ), which on the, the press roll ( 5 ) opposite side of the fibrous web ( 1 ) is arranged.
  7. Device according to one of the preceding claims, characterized in that in web direction ( 14 ) in front of the press roll ( 5 ) a steam box ( 8th ) is arranged, which with the press roller ( 5 ) in contact with the band ( 2 ) is charged with superheated steam.
  8. Apparatus according to claim 6 and 7, characterized in that the steam blower box ( 8th ) opposite the guide roll ( 7 ) is arranged.
  9. Device according to one of claims 6 to 8, characterized in that the of the bands ( 2 . 3 . 4 ) jointly wrapped guide roller ( 7 ) is designed as Saugleitwalze.
  10. Device according to one of claims 6 to 9, characterized in that the diameter of the guide roller ( 7 ) is less than 800 mm.
  11. Device according to one of the preceding claims, characterized in that on the, the press roll ( 5 ) opposite side of the fibrous web ( 1 ) at least two bands ( 3 . 4 ) are arranged, the outer the pressing band ( 4 ).
  12. Device according to one of claims 1 to 10, characterized in that on the, the press roll ( 5 ) opposite side of the fibrous web ( 1 ) only one volume ( 4 ) is arranged.
  13. Device according to one of the preceding claims, characterized in that at least the pressing band ( 4 ) after the press roll ( 5 ) a driven guide roller ( 10 ) wraps around.
  14. Device according to one of the preceding claims, characterized in that between the fibrous web ( 1 ) and the press roll ( 5 ) only one volume ( 2 ) is arranged.
  15. Application of the device according to one of the preceding claims for drainage a tissue web.
  16. Apparatus according to claim 15, characterized in that between the press roll ( 5 ) and the fibrous web ( 1 ) arranged band ( 2 ) the fibrous web ( 1 ) from an upstream unit, in particular a headbox ( 11 ) to a downstream unit, in particular a drying cylinder ( 12 ) leads.
  17. Apparatus according to claim 15 or 16, characterized in that between the fibrous web ( 1 ) and the press roll ( 5 ) arranged band ( 2 ) in the contact area with the fibrous web ( 1 ) has a textured surface.
  18. Device according to one of the preceding claims, characterized in that the press roll ( 5 ) over the fibrous web ( 1 ) is arranged.
DE200610021328 2006-05-05 2006-05-05 dehydrator Withdrawn DE102006021328A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200610021328 DE102006021328A1 (en) 2006-05-05 2006-05-05 dehydrator

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610021328 DE102006021328A1 (en) 2006-05-05 2006-05-05 dehydrator
EP20070107298 EP1852551B1 (en) 2006-05-05 2007-05-02 Dewatering device

Publications (1)

Publication Number Publication Date
DE102006021328A1 true DE102006021328A1 (en) 2007-11-08

Family

ID=38169311

Family Applications (1)

Application Number Title Priority Date Filing Date
DE200610021328 Withdrawn DE102006021328A1 (en) 2006-05-05 2006-05-05 dehydrator

Country Status (2)

Country Link
EP (1) EP1852551B1 (en)
DE (1) DE102006021328A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006062235A1 (en) * 2006-12-22 2008-06-26 Voith Patent Gmbh Method and device for drying a fibrous web
DE102006062234A1 (en) 2006-12-22 2008-06-26 Voith Patent Gmbh Method and device for drying a fibrous web
AT505760B1 (en) * 2008-01-09 2009-04-15 Andritz Ag Maschf Device and method for tapping a material rail
WO2015000690A1 (en) * 2013-07-04 2015-01-08 Voith Patent Gmbh Method and compact device for producing non-woven fabric
EP3212843B1 (en) * 2014-10-29 2018-07-18 Voith Patent GmbH Device for dewatering a fiber web

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3303576A (en) * 1965-05-28 1967-02-14 Procter & Gamble Apparatus for drying porous paper
US3771236A (en) * 1971-01-12 1973-11-13 R Candor Method and apparatus for treating sheet-like material with fluid
US5814190A (en) * 1994-06-29 1998-09-29 The Procter & Gamble Company Method for making paper web having both bulk and smoothness
FR2733522B1 (en) * 1995-04-28 1997-06-20 Kaysersberg Sa Method and device for manufacturing a sheet of paper by predrying with through air
DE10303959A1 (en) * 2003-01-31 2004-09-02 Voith Paper Patent Gmbh The water displacement press to extract water from a wet web, of paper or cardboard, uses a gas blower roller from below to give a gas pressure combined with an upper mechanical pressure
US7297233B2 (en) * 2004-01-30 2007-11-20 Voith Paper Patent Gmbh Dewatering apparatus in a paper machine

Also Published As

Publication number Publication date
EP1852551A1 (en) 2007-11-07
EP1852551B1 (en) 2014-03-19

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Legal Events

Date Code Title Description
R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee

Effective date: 20121201