EP1342837A2 - Dispositif de pressage - Google Patents

Dispositif de pressage Download PDF

Info

Publication number: EP1342837A2
Authority: EP; European Patent Office
Prior art keywords: press; transfer belt; roll; nip; arrangement according
Prior art date: 2002-03-07
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.): Granted

Application number

EP03001821A

Other languages

German (de)

English (en)

Other versions

EP1342837A3 (fr

EP1342837B1 (fr

Inventor

Ulrich Fluehler

Pier Luigi Pamato

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 Paper 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.)

2002-03-07

Filing date

2003-01-29

Publication date

2003-09-10

2003-01-29 Application filed by Voith Paper Patent GmbH filed Critical Voith Paper Patent GmbH

2003-09-10 Publication of EP1342837A2 publication Critical patent/EP1342837A2/fr

2004-02-11 Publication of EP1342837A3 publication Critical patent/EP1342837A3/fr

2008-03-05 Application granted granted Critical

2008-03-05 Publication of EP1342837B1 publication Critical patent/EP1342837B1/fr

2023-01-29 Anticipated expiration legal-status Critical

Status Expired - Lifetime legal-status Critical Current

Links

Images

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
- D21F3/04—Arrangements thereof

Definitions

the invention relates to a press arrangement with a plurality of press nips for dewatering a paper, cardboard, tissue or other fibrous web, which are each formed by two press rolls, at least one central press roll with a plurality of press rolls each forming a press nip, at least around the central press roll an endlessly circulating, water-absorbing dewatering belt is guided and through the last press nip of the central press roll an endlessly circulating, smooth transfer belt taking over the fibrous web from the dewatering belt and passing after this press nip through at least one further press nip.
the press roll wrapped in the transfer belt forms the further press nip with another press roll.
This arrangement is very compact, but requires the use of at least one deflection-controlled press roll in each of the two press nips to control the two press nips of the transfer belt, which is relatively expensive.
the object of the invention is therefore to create a relatively compact press arrangement while ensuring a safe web guide and a good drainage result with relatively little effort.
the object was achieved in that the transfer belt runs around a plurality of transfer belt press rolls and the first two transfer belt press rolls are also involved in the formation of the first two press nips of the transfer belt.
the central press roller continues to ensure the compactness of the press arrangement. Furthermore, the transfer belt enables a closed and thus safe web guidance in this area even at high machine speeds.
the press pressures in these press nips can also be controlled or adjusted independently of one another.
the transfer press rolls can also be constructed relatively simply, i.e. be equipped without deflection control.
the drainage belts serve to receive and to remove the water pressed out of the fibrous web in the respective press nip and are mostly designed as press felts.
the transfer belt is smooth and usually has a closed surface so that it cannot absorb water.
the transfer belt runs together with the fibrous web over one or more substantially straight sections.
Several sections result from the deflection via one or more guide rollers.
the transfer belt leaves the first transfer belt press roller, there is a transition from the curved curve predetermined by the looping of the transfer belt press roller to a straight course in the following section. Since the neutral fiber of such drainage belts is usually approximately in the middle, this transition leads to a compression of the side of the drainage belt which is in contact with the fibrous web.
the transfer belt runs onto the second transfer belt press roller, the transfer belt changes from a straight course in the partial section to a curved course during the wrapping of this transfer belt press roller. During this transition, the side of the transfer belt that is in contact with the fibrous web is stretched in an analogous manner.
a bubble can form in the fibrous web in front of the second press nip of the transfer belt. which causes wrinkling and thus an impairment of the quality of the fibrous web. This results in particular from the fact that the fibrous web does not follow the compression and stretching of the surface of the transfer belt, or at most only partially.
the first two transfer belt press rolls should have approximately the same diameter or the diameter of the first transfer belt press roll should be larger than the diameter of the second transfer belt press roll. This ensures that the stretch is at least as pronounced as the compression. In the event of greater stretching, there is greater stretching of the transfer belt at the inlet into the press nip of the second transfer belt press roll, which can improve the reliable guidance of the fibrous web.
the second press nip of the transfer belt can also be designed as a smoothing gap.
the opposing press roller would have to have a smooth surface or be wrapped in a belt with a smooth surface.
the second press nip of the transfer belt is to be used for dewatering the fibrous web, then an endlessly circulating and water-absorbing belt should be guided through this press nip on the side of the fibrous web opposite the transfer belt.
the second The press nip of the transfer belt must be extended. It is advantageous here if the press roll of the second press nip of the transfer belt opposite the transfer belt press roll is designed as a shoe press roll.
the transfer belt press rolls In order to avoid distortion of the transfer belt as a result of the wrapping, the transfer belt press rolls should have the same axial diameter as possible. Therefore, all, but at least the first two transfer belt press rolls should be cylindrical and without crowning or cambered, preferably cambered with the same thickness. Bombed means that the diameter of a press roll gradually increases from the two roll ends to the middle of the roll. With very wide rolls and the associated sag, the press forces in the press nip can often be evened out.
the roll jacket of the shoe press roll should be negatively cambered.
a negative crowning results if the outer diameter of the roll shell decreases from the two roll ends to the middle of the roll.
the fibrous web should be passed through the press nip, especially in the first press nip of the press section together with a dewatering belt on both sides. Furthermore, the execution of the central press roll as a suction roll can still support the water removal.
This suction roll can also be designed cambered in the axial direction to compensate for the sag and in the interest of equalizing the press forces in the press nip.
the transfer belt can also be passed through more than two press nips together with the fibrous web. It is also possible that the fibrous web then runs through a further press nip without the transfer belt, but for example with a dewatering belt.
the press arrangement here is part of a paper machine for producing the fibrous web 1 and is used for dewatering the same.
the fibrous web 1 is transferred from the forming wire 6 of a former upstream of the press arrangement in the web running direction 17 for sheet formation to a dewatering belt 5.
the air-permeable dewatering belt 5 loops around a suction-guided guide roller 13, which supports the transfer.
the dewatering belt 5 then wraps around a convex press roll 10 together with the external fibrous web 1.
This press roll 10 forms a press nip with two press rolls 12, 8 and is designed as a suction roll.
an endless and water-absorbing drainage belt 4, 5 also runs through the first press nip on both sides of the fibrous web.
the suction roller sucks out water in the area of the press nip and in the looping area the drainage belt 5, which increases its water absorption capacity and counteracts rewetting of the fibrous web 1.
the crowning of the suction roll is intended to equalize the press forces in the Guide the press nip in the axial direction. This is necessary because of the weight-related deflection of such wide and heavy rolls. This crowning is usually sufficient so that no expensive, deflection-controlled press rolls 8, 12 have to be used.
a smooth transfer belt 2 runs through the second press nip of the suction roll on the side of the fibrous web 1 opposite the dewatering belt 5. This transfer belt 2 takes over the fibrous web 1 from the dewatering belt 5 and guides the fibrous web 1 after being wrapped around the transfer belt press roll 8 and through third press nip.
the transfer belt 2 has a closed surface, so that it can absorb little or no water. However, this is also not necessary, since in the second and, of course, also in the third press nip, only one dewatering belt 5, 3 is sufficient to absorb the squeezed water. However, the transfer belt 2 enables the fibrous web 1 to be guided through the press arrangement in a closed manner, so that even at high machine speeds, a safe web guidance can be ensured without the risk of the fibrous web 1 tearing or tearing.
both transfer belt press rolls 8, 9 have the same diameter.
both transfer belt press rolls 8, 9 are cylindrical and without crowning. This similar design prevents the build-up of tensions in the transfer belt 5.
the second transfer belt press roll 9 forms with a deflection-controlled Press roll 11 a press nip.
An endless and water-absorbing dewatering belt 3 runs through this press nip on the side of the fibrous web 1 opposite the transfer belt 2.
this press nip is extended.
the press roll 11 consists of a flexible roll jacket, which runs in the area of the press nip via a pressure element 16 with a concave press surface. According to the requirements, however, it can also be advantageous if this press nip is formed by two cylindrical press rolls 9, 11 and is therefore not extended.
the transfer belt 2 alone continues the fibrous web 1 until it is delivered to a dryer fabric 7 of a subsequent dryer group.
the transfer is supported by a guide roller 14 which is wrapped and vacuumed by the air-permeable dryer fabric 7.
the fibrous web 1 is guided for drying over heated drying cylinders 15.
other units of the paper machine can follow, for example a smoothing device.
the suction roll and the suction guide rolls 13, 14 have a perforated roll casing, the interior of which is connected to a vacuum source.
the drainage belts 3, 4, 5 are designed as air-permeable and water-absorbent press felts.
the press forces in each press nip can also be set or controlled independently of one another.
the available space for the possibly necessary change of rollers or belts is increased in this area, with sufficient space in particular in the area under the press rollers 8, 9 Arrangement of a cantilever for changing the transfer belt 2 is available.

Landscapes

Paper (AREA)
Press Drives And Press Lines (AREA)
Glass Compositions (AREA)
Auxiliary Devices For And Details Of Packaging Control (AREA)

EP03001821A 2002-03-07 2003-01-29 Dispositif de pressage Expired - Lifetime EP1342837B1 (fr)

Applications Claiming Priority (2)

Application Number	Priority Date	Filing Date	Title
DE10210169		2002-03-07
DE10210169A DE10210169A1 (de)	2002-03-07	2002-03-07	Pressanordnung

Publications (3)

Publication Number	Publication Date
EP1342837A2 true EP1342837A2 (fr)	2003-09-10
EP1342837A3 EP1342837A3 (fr)	2004-02-11
EP1342837B1 EP1342837B1 (fr)	2008-03-05

Family

ID=27740694

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP03001821A Expired - Lifetime EP1342837B1 (fr)	2002-03-07	2003-01-29	Dispositif de pressage

Country Status (3)

Country	Link
EP (1)	EP1342837B1 (fr)
AT (1)	ATE388269T1 (fr)
DE (2)	DE10210169A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
WO2018104110A1 (fr) *	2016-12-05	2018-06-14	Voith Patent Gmbh	Ensemble de pressage

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US4483745A (en) *	1982-09-29	1984-11-20	Beloit Corporation	Method and apparatus of sheet transfer using a nonporous smooth surfaced belt
FI85520C (fi) *	1988-12-23	1992-04-27	Tampella Oy Ab	Foerfarande och anordning foer ledande av en fiberbana fraon en vira genom ett pressparti.
DE4321399A1 (de) *	1993-06-26	1993-11-11	Voith Gmbh J M	Pressenpartie einer Papiermaschine
US5876565A (en) *	1994-10-06	1999-03-02	Valmet Corporation	Press section with an equalizing nip for compensating for elongation of a paper web
DE19816673A1 (de) *	1998-04-15	1999-10-21	Voith Sulzer Papiertech Patent	Preßwalze sowie Pressenanordnung mit wenigstens einer solchen Preßwalze
DE10022605A1 (de) *	2000-05-09	2001-11-15	Voith Paper Patent Gmbh	Pressenpartie

2002
- 2002-03-07 DE DE10210169A patent/DE10210169A1/de not_active Withdrawn
2003
- 2003-01-29 AT AT03001821T patent/ATE388269T1/de not_active IP Right Cessation
- 2003-01-29 DE DE50309289T patent/DE50309289D1/de not_active Expired - Lifetime
- 2003-01-29 EP EP03001821A patent/EP1342837B1/fr not_active Expired - Lifetime

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
WO2018104110A1 (fr) *	2016-12-05	2018-06-14	Voith Patent Gmbh	Ensemble de pressage
CN109996922A (zh) *	2016-12-05	2019-07-09	福伊特专利有限公司	压榨装置

Also Published As

Publication number	Publication date
DE50309289D1 (de)	2008-04-17
EP1342837A3 (fr)	2004-02-11
ATE388269T1 (de)	2008-03-15
EP1342837B1 (fr)	2008-03-05
DE10210169A1 (de)	2003-09-18

Legal Events

Date	Code	Title	Description
2003-07-25	PUAI	Public reference made under article 153(3) epc to a published international application that has entered the european phase	Free format text: ORIGINAL CODE: 0009012
2003-09-10	AK	Designated contracting states	Kind code of ref document: A2 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR
2003-09-10	AX	Request for extension of the european patent	Extension state: AL LT LV MK RO
2003-12-26	PUAL	Search report despatched	Free format text: ORIGINAL CODE: 0009013
2004-02-11	AK	Designated contracting states	Kind code of ref document: A3 Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IT LI LU MC NL PT SE SI SK TR
2004-02-11	AX	Request for extension of the european patent	Extension state: AL LT LV MK RO
2004-02-11	RIC1	Information provided on ipc code assigned before grant	Ipc: 7D 21F 3/04 A
2004-10-13	17P	Request for examination filed	Effective date: 20040811
2004-11-03	AKX	Designation fees paid	Designated state(s): AT DE FI SE
2006-09-13	RAP1	Party data changed (applicant data changed or rights of an application transferred)	Owner name: VOITH PATENT GMBH
2006-11-08	17Q	First examination report despatched	Effective date: 20061006
2007-09-04	GRAP	Despatch of communication of intention to grant a patent	Free format text: ORIGINAL CODE: EPIDOSNIGR1
2008-01-26	GRAS	Grant fee paid	Free format text: ORIGINAL CODE: EPIDOSNIGR3
2008-02-01	GRAA	(expected) grant	Free format text: ORIGINAL CODE: 0009210
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2009-01-09	STAA	Information on the status of an ep patent application or granted ep patent	Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT
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