EP1088936B1 - Vorrichtung zur Entwässerung einer Materialbahn - Google Patents
Vorrichtung zur Entwässerung einer Materialbahn Download PDFInfo
- Publication number
- EP1088936B1 EP1088936B1 EP00115691A EP00115691A EP1088936B1 EP 1088936 B1 EP1088936 B1 EP 1088936B1 EP 00115691 A EP00115691 A EP 00115691A EP 00115691 A EP00115691 A EP 00115691A EP 1088936 B1 EP1088936 B1 EP 1088936B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rolls
- material web
- rollers
- web
- pressure space
- 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.)
- Expired - Lifetime
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
- D21F3/0209—Wet presses with extended press nip
- D21F3/0254—Cluster presses, i.e. presses comprising a press chamber defined by at least three rollers
Definitions
- the invention relates to a device for dewatering a material web, especially a paper or cardboard web, by driving out Water from the material web by means of gas pressure, with at least one of at least four parallel arranged limited pressure space, in which a compressed gas can be introduced and through which the material web can be passed is.
- a device for dewatering a material web especially a paper or cardboard web
- gas pressure with at least one of at least four parallel arranged limited pressure space, in which a compressed gas can be introduced and through which the material web can be passed is.
- the compressed gas is pressed through the material web and in this way driven the water out of the material web.
- the adjustability of the relative arrangement the geometry or shape of the pressure chamber are changed. This creates the ability to determine the length of the distance that the Material web travels within the print room, to vary in a targeted manner.
- the Dwell time of the material web within the printing space on each desired value can be set.
- the drainage device according to the invention is therefore particularly versatile and can be used for a variety of materials are used. In a machine for Production of a paper or cardboard web, for example, can only be done with a drainage device according to the needs different types of paper or cardboard are taken into account, by adjusting the relative roller positions required dwell time of the web to be drained within the pressure chamber is set.
- the pressure chamber remains received as such. Only the geometry or the shape of the pressure chamber is changed by adjusting the rollers.
- two opposing rollers each automatically make an adjustment movement at least one of the other two rollers can be tracked.
- the two rollers lying opposite one another are biased in contact with the other two rollers, respectively the distance between the other two rollers is adjustable.
- the two preloaded rollers have a smaller one Have diameter than the other two rollers.
- the pretensioning of the rollers can be carried out according to a variant of the invention can be achieved in that the pretensioned rollers each by at least a pretensioner is coupled to a stationary support are.
- the prestressing devices can be elastically deformable, for example and e.g. be designed as compression spring assemblies, each support one end on the fixed support and the other End are connected to the respective roller.
- the bias is Rolling achieved in that the rollers via at least one biasing device are coupled together.
- the pretensioner for example elastically deformable and e.g. designed as a tension spring arrangement strives to move the two rollers towards each other whereby the two preloaded rollers against the other two rollers be pressed.
- the biasing devices can also be hydraulic or pneumatic cylinders.
- the fluid or gas pressure, the contact pressure of the rollers can be specified, the Fluid or gas pressure, in particular depending on that in the pressure chamber prevailing pressure by means of a control and / or regulating device can be adjusted.
- adjustable pretensioners can in particular the mechanical pressure on the material web vary in the inlet gap and in the outlet gap of the pressure chamber, whereby a specific effectiveness can be set and / or post-compression of the material web is made possible.
- the prestressed Rolls in permanent contact with the other two rolls held so that at least one of the two during an adjustment movement other rollers follow the prestressed rollers of the adjustment movement can and at the end of the adjustment movement one of all four rollers limited Print room with the desired geometry or shape available is.
- the object on which the invention is based is also achieved by a method for dewatering a material web, in particular one Paper or cardboard web, by expelling water from the material web by means of gas pressure in which at least one pressure chamber Pressurized gas is introduced and the material web is guided through the pressure chamber is, the effective range for adjusting the drainage capacity the pressure chamber, in particular its effective length, in the running direction the material web is changed.
- the effective range can be changed of the printing area the dwell time of the material web in the printing area varies and in this way the drainage capacity in the desired one Way to be set.
- the 1 comprises two large rollers 14, 16 and two small rollers 15, 17. The latter are also called cap rolls designated.
- the four rollers 14-17 delimit a pressure chamber 12.
- Compressed gas for example compressed air, are introduced into the pressure chamber 12, to generate a pressure "P" in the pressure chamber 12.
- a web of material 10 to be drained for example a paper or Cardboard web is guided in the direction B through the pressure chamber 12.
- a web of material 10 to be drained for example a paper or Cardboard web is guided in the direction B through the pressure chamber 12.
- a band 22 of water-absorbent Material for example made of felt, and a membrane 26 are arranged.
- the arrangement of material web 10, felt 22 and membrane 26 is such led that it wraps around the lower large roller 16 in Fig. 1.
- the web of material 10 is thus with the interposition of the felt 22 on the jacket the roller 16 on.
- Material web 10, felt 22 and membrane 26 pass through one of the lower roller 16 and the left small roller 17 formed nip 52 into the pressure chamber 12 and leave the pressure chamber 12 one formed by the lower roller 16 and the right small roller 15 Exit gap 53.
- the dashed line at the lower roller 16 indicates that the roller 16 or its roller shell with a surface structure e.g. is provided in the form of grooves or blind holes.
- the lower roller 16 is fixed to a roller support 62, which is also called Chair is called, stored such that they are rotated can, however, a translational movement perpendicular to its longitudinal extent not possible.
- the one opposite the fixed roller 16 large roller 14, however, is - as indicated by the double arrow in Fig. 1 movable relative to a roller support or frame 64, that the distance between the two large rollers 14, 16th can be changed by moving the upper roller 14.
- the two small rollers 15, 17 are each with a pretensioner 65, 63 coupled, which is supported on a fixed support 68, 66 is.
- the biasing devices 65, 63, the z. B. each as The small rollers are compression spring assemblies 15, 17 are biased in contact with both large rollers 14, 16.
- the pretensioners 65, 63 can each at the end regions of the rollers 15, 17 attack.
- the pressure chamber 12 introduced pressure gas through the gas permeable membrane 26 and pressed through the material web 10 to be dewatered, whereby the water is driven out of the material web 10 and into the felt 22 becomes.
- the removal of the water driven out of the material web 10 takes place through the felt 22 and the surface structure of the roller 16.
- the membrane 26 creates a mechanical pressure on the surface the material web 10, whereby the drainage effect by the Compressed gas in the pressure chamber 12 is increased.
- the configuration of the rollers 14-17 and thus the geometry or shape of the pressure chamber 12 is due to the distance between the two large rollers 14, 16 determined.
- Each distance between the rollers 14, 16 corresponds to one from the material web 10 between the entrance gap 52 and the exit gap 53 drainage route to be covered and one - from the Dependent on web speed - dwell time of the material web 10 within the pressure chamber 12.
- the upper roller 14 is placed on the lower one Roller 16 moves to or away from this, with the preloaded small Rollers 15, 17 due to their essentially free mobility Storage can follow this adjustment movement.
- the possibility according to the invention for adjusting the drainage capacity allows changes to be taken into account in an advantageous manner, which affect the drainability of the material web 10, such as e.g. Changes in mass per unit area, i.e. the basis weight, the material web 10, changes in machine speed and / or changes in substance input.
- the bias of the small rollers 15, 17 ensures that the small rollers 15, 17 in contact with both large ones at all times Rollers 14, 16 are located and by the adjustment movement of the upper Roller 14 changing in terms of geometry or shape Pressure chamber 12 bounded by the four rollers 14-17 at all times is.
- the drainage device according to the invention shown in FIG. 2 differs from that of FIG. 1 by the way in which the bias of the small rollers 15, 17 is achieved.
- the rollers 15, 17 are connected to one another by a prestressing device 67 connected by which the rollers 15, 17 are drawn towards each other.
- the pretensioning device 67 can, for example, be a Act tension spring arrangement.
- the pretensioner 67 pulls the rollers 15, 17 each in contact with the two large rollers 14, 16 so that the Rollers 15, 17 follow an adjustment movement of the upper large roller 14 can and get in contact with both large rollers at all times 14, 16 are located.
- the material web is 10, which enters the pressure chamber 12 through an inlet gap 55 and led out of the pressure chamber 12 through an outlet gap 53 between a drainage felt 22 and a membrane 26 arranged according to the embodiment of Fig. 1.
- the biasing devices 65, 63 of the embodiment of Fig. 1 as well the biasing means 67 of the embodiment of FIG. 2 are each formed such that the biasing force exerted on the respective roller 15, 17 is essentially independent of the roll position, i.e. at any time, the small rollers 15, 17 are each at least approximately with a path-independent constant force against the two large rollers 14, 16 pressed.
- the material web 10 is guided once through the pressure chamber 12. According to the invention, it is also possible in principle to run two passes To provide material web 10 through the pressure chamber 12, d. H. the material web 10 twice in succession through the pressure chamber 12.
Landscapes
- Paper (AREA)
Description
- Fig. 1
- eine schematische Seitenansicht einer Entwässerungsvorrichtung gemäß einer Ausführungsform der Erfindung, und
- Fig. 2
- eine Ansicht entsprechend Fig. 1 einer Entwässerungsvorrichtung gemäß einer weiteren Ausführungsform der Erfindung.
- 10
- Materialbahn
- 12
- Druckraum
- 14
- große Walze
- 15
- kleine Walze
- 16
- große Walze
- 17
- kleine Walze
- 22
- Band, Filz
- 26
- Membran
- 52
- Eintrittsspalt
- 53
- Austrittsspalt
- 62
- Walzenabstützung
- 63
- Vorspanneinrichtung
- 64
- Walzenabstützung
- 65
- Vorspanneinrichtung
- 66
- Abstützung
- 67
- Vorspanneinrichtung
- 68
- Abstützung
- B
- Bahnlaufrichtung
Claims (13)
- Vorrichtung zur Entwässerung einer Materialbahn (10), insbesondere einer Papier- oder Kartonbahn, durch Austreiben von Wasser aus der Materialbahn (10) mittels Gasdruck, mit zumindest einem von wenigstens vier parallel angeordneten Walzen (14, 15, 16, 17) begrenzten Druckraum (12), in den ein Druckgas einleitbar und durch den die Materialbahn (10) hindurchführbar ist, dadurch gekennzeichnet, daß die Positionen der Walzen (14, 15, 16, 17) relativ zueinander verstellbar sind.
- Vorrichtung nach Anspruch 1,
dadurch gekennzeichnet, daß die Positionen der Walzen (14, 15, 16, 17) unter Beibehaltung eines zu jedem Zeitpunkt von den Walzen (14, 15, 16, 17) begrenzten Druckraumes (12) verstellbar sind. - Vorrichtung nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß zwei einander gegenüberliegende Walzen (15, 17) jeweils automatisch einer Verstellbewegung zumindest einer der beiden anderen Walzen (14, 16) nachführbar sind. - Vorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß zwei einander gegenüberliegende Walzen (15, 17) jeweils in Kontakt mit den beiden anderen Walzen (14, 16) vorgespannt sind und der Abstand zwischen den beiden anderen Walzen (14, 16) verstellbar ist. - Vorrichtung nach Anspruch 4,
dadurch gekennzeichnet, daß die beiden vorgespannten Walzen (15, 17) einen kleineren, bevorzugt einen wesentlich kleineren Durchmesser aufweisen als die beiden anderen Walzen (14, 16). - Vorrichtung nach Anspruch 4 oder 5,
dadurch gekennzeichnet, daß von den beiden Walzen (14, 16), deren Abstand verstellbar ist, die eine Walze (16) fest an einer Walzenabstützung (62) gelagert und die andere Walze (14) relativ zu der festen Walze (16) bewegbar ist. - Vorrichtung nach einem der Ansprüche 4 bis 6,
dadurch gekennzeichnet, daß die vorgespannten Walzen (15, 17) jeweils über zumindest eine Vorspanneinrichtung (63, 65), insbesondere eine Druckfederanordnung, an eine ortsfeste Abstützung (66, 68) gekoppelt sind. - Vorrichtung nach einem der Ansprüche 4 bis 6,
dadurch gekennzeichnet, daß die vorgespannten Walzen (15, 17) über zumindest eine Vorspanneinrichtung (67), insbesondere eine Zugfederanordnung, miteinander gekoppelt sind. - Vorrichtung nach einem der Ansprüche 4 bis 8,
dadurch gekennzeichnet, daß die Vorspanneinrichtungen (63, 65; 67) jeweils derart ausgebildet sind, daß die auf die jeweilige vorgespannte Walze (15, 17) ausgeübte Vorspannkraft zumindest im wesentlichen unabhängig von der Position der vorgespannten Walze (15, 17) ist. - Vorrichtung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß zumindest innerhalb des Druckraumes (12) die Materialbahn (10) zwischen einem Band (22) aus wasseraufnahmefähigem Material, insbesondere aus Filz, und einer Membran (26) angeordnet ist. - Verfahren zur Entwässerung einer Materialbahn (10), insbesondere einer Papier- oder Kartonbahn, durch Austreiben von Wasser aus der Materialbahn (10) mittels Gasdruck, bei dem in zumindest einen Druckraum (12) ein Druckgas eingeleitet und die Materialbahn (10) durch den Druckraum (12) geführt wird, dadurch gekennzeichnet, daß zum Einstellen der Entwässerungskapazität der Wirkungsbereich des Druckraumes (12), insbesondere dessen wirksame Länge, in Laufrichtung (B) der Materialbahn (10) verändert wird.
- Verfahren nach Anspruch 11,
dadurch gekennzeichnet, daß wenigstens eine Vorrichtung nach zumindest einem der Ansprüche 1 bis 10 verwendet wird. - Verfahren zur Entwässerung einer Materialbahn (10), insbesondere einer Papier- oder Kartonbahn, durch Austreiben von Wasser aus der Materialbahn (10) mittels Gasdruck, unter Verwendung einer Vorrichtung nach einem der Ansprüche 1 bis 10, bei dem der beim Eintreten in den Druckraum (12) und/oder beim Austreten aus dem Druckraum (12) von den Walzen (14, 15, 16, 17) auf die Materialbahn (10) ausgeübte mechanische Druck durch Verändern der Kraft, mit der die einen jeweiligen Spalt (52, 53) bildenden Walzen (14, 15, 16, 17) gegeneinander gepreßt werden, variiert wird.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19946971 | 1999-09-30 | ||
DE19946971A DE19946971A1 (de) | 1999-09-30 | 1999-09-30 | Vorrichtung zur Entwässerung einer Materialbahn |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1088936A2 EP1088936A2 (de) | 2001-04-04 |
EP1088936A3 EP1088936A3 (de) | 2001-09-05 |
EP1088936B1 true EP1088936B1 (de) | 2004-07-14 |
Family
ID=7923916
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00115691A Expired - Lifetime EP1088936B1 (de) | 1999-09-30 | 2000-07-21 | Vorrichtung zur Entwässerung einer Materialbahn |
Country Status (3)
Country | Link |
---|---|
US (1) | US6381868B1 (de) |
EP (1) | EP1088936B1 (de) |
DE (2) | DE19946971A1 (de) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10159411A1 (de) * | 2001-12-04 | 2003-06-12 | Voith Paper Patent Gmbh | Vorrichtung zur Entwässerung einer Faserstoffbahn |
US20030153443A1 (en) * | 2002-02-11 | 2003-08-14 | Beck David A. | Elastic roller for a pressing apparatus |
US7494563B2 (en) | 2002-10-07 | 2009-02-24 | Georgia-Pacific Consumer Products Lp | Fabric creped absorbent sheet with variable local basis weight |
US8398820B2 (en) | 2002-10-07 | 2013-03-19 | Georgia-Pacific Consumer Products Lp | Method of making a belt-creped absorbent cellulosic sheet |
US7662257B2 (en) * | 2005-04-21 | 2010-02-16 | Georgia-Pacific Consumer Products Llc | Multi-ply paper towel with absorbent core |
US8293072B2 (en) | 2009-01-28 | 2012-10-23 | Georgia-Pacific Consumer Products Lp | Belt-creped, variable local basis weight absorbent sheet prepared with perforated polymeric belt |
US7416637B2 (en) * | 2004-07-01 | 2008-08-26 | Georgia-Pacific Consumer Products Lp | Low compaction, pneumatic dewatering process for producing absorbent sheet |
US7585388B2 (en) * | 2005-06-24 | 2009-09-08 | Georgia-Pacific Consumer Products Lp | Fabric-creped sheet for dispensers |
US8540846B2 (en) | 2009-01-28 | 2013-09-24 | Georgia-Pacific Consumer Products Lp | Belt-creped, variable local basis weight multi-ply sheet with cellulose microfiber prepared with perforated polymeric belt |
WO2010033536A2 (en) | 2008-09-16 | 2010-03-25 | Dixie Consumer Products Llc | Food wrap basesheet with regenerated cellulose microfiber |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3293121A (en) * | 1963-10-09 | 1966-12-20 | Black Clawson Co | Pneumatically pressurized paper wet press assembly |
US3315370A (en) * | 1964-05-06 | 1967-04-25 | Hikosaka Hiroshi | Continuous dehydrating apparatus |
DE2364346C3 (de) * | 1973-12-22 | 1978-04-06 | J.M. Voith Gmbh, 7920 Heidenheim | Trockeneinrichtung für Papierbahnen o.dgl |
FI772143A (fi) * | 1977-07-08 | 1979-01-09 | Tampella Oy Ab | Laongzonspress foer pappersmaskin |
CA1161678A (en) * | 1981-07-06 | 1984-02-07 | David R. Webster | Multi-nip suction press |
US4675079A (en) * | 1982-12-14 | 1987-06-23 | Webster David R | Multi-nip suction press with a four roller closed train |
DE19613339C2 (de) * | 1996-04-03 | 1998-11-12 | Voith Sulzer Papiermasch Gmbh | Vorrichtung und Verfahren zum Trocknen einer Materialbahn |
DE19627890A1 (de) * | 1996-07-11 | 1998-01-15 | Voith Sulzer Papiermasch Gmbh | Verfahren und Vorrichtung zum Entwässern einer Papierbahn |
-
1999
- 1999-09-30 DE DE19946971A patent/DE19946971A1/de not_active Withdrawn
-
2000
- 2000-07-21 DE DE50007051T patent/DE50007051D1/de not_active Expired - Fee Related
- 2000-07-21 EP EP00115691A patent/EP1088936B1/de not_active Expired - Lifetime
- 2000-09-29 US US09/675,653 patent/US6381868B1/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
---|---|
DE19946971A1 (de) | 2001-04-05 |
US6381868B1 (en) | 2002-05-07 |
EP1088936A3 (de) | 2001-09-05 |
DE50007051D1 (de) | 2004-08-19 |
EP1088936A2 (de) | 2001-04-04 |
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