EP2205792A1 - Doppelsiebformer - Google Patents
DoppelsiebformerInfo
- Publication number
- EP2205792A1 EP2205792A1 EP08804360A EP08804360A EP2205792A1 EP 2205792 A1 EP2205792 A1 EP 2205792A1 EP 08804360 A EP08804360 A EP 08804360A EP 08804360 A EP08804360 A EP 08804360A EP 2205792 A1 EP2205792 A1 EP 2205792A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- twin
- machine direction
- pressure
- wire former
- wire
- 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.)
- Granted
Links
- 239000000725 suspension Substances 0.000 claims abstract description 12
- 210000004013 groin Anatomy 0.000 claims description 7
- 239000000835 fiber Substances 0.000 abstract 3
- 239000011111 cardboard Substances 0.000 abstract 1
- 239000011087 paperboard Substances 0.000 abstract 1
- 238000007596 consolidation process Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 241000288673 Chiroptera Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
- D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/48—Suction apparatus
Definitions
- the invention relates to a twin-wire former of a machine for producing a fibrous web, in particular paper or board web, from a pulp suspension, with a continuous endless bottom wire and a continuous endless top wire, which are brought together to form a twin-wire zone, in which the pulp suspension is introduced, wherein At least one of the two screens is pressed resiliently against the other screen by means of pressing bars extending generally transversely to the machine running direction.
- Twin-wire formers of this type are known, for example, from the publications DE 10 2005 041 554 A1 and DE 44 02 274 A1.
- the pressing strips can be provided, for example, in the form of shoe segments forming a drainage shoe (DE 10 2005 41 554 A1) or at a distance from one another (DE 44 02 274 A1).
- the lower wire and the upper wire were brought together by means of pneumatically pressed strips.
- the strips had a width measured in the machine direction of 5 to 25 mm and usually a width of 15 mm.
- the contact pressure varied between 50 to 250 mbar and was usually between 80 and 120 mbar.
- the distance between the bars is currently 120 mm by default.
- the last surface is usually a flat surface without foil angle or curvature.
- the contact pressure of the strips, the wire tension, the strip width and the strip shape define the drainage pressure.
- the invention has for its object to provide an improved twin-wire former of the type mentioned, in which the aforementioned disadvantages are eliminated.
- the dewatering performance in the area of screen consolidation should be increased, without the dewatering pressure having to be excessively increased or even destroyed.
- the constant radius of curvature or the first radius of curvature of the surface of a respective pressure strip viewed in the machine direction is selected so that the sieve pressed against the other sieve by the pressure bar is almost or at least essentially tangential to the front edge portion in the region runs up the front edge of the groin or at least slightly wraps around the front edge of the groin.
- the radius of curvature or the first radius in the direction of travel can thus be selected such that the relevant wire almost tangential or ideally slightly looped onto the edge of the strip, depending on the insertion depth of the strip.
- the pressing strips are each assigned at least one pneumatic contact pressure.
- At least one tilting pressure bar in particular about an axis extending transversely to the machine direction, is provided.
- a respective tiltable pressure strip is preferably provided with at least two in particular in the machine direction a distance from each other having contact pressures.
- at least one contact pressure is provided in the front and rear regions of a respective tiltable pressure strip considered in the machine direction.
- At least one flexible pressing bar is provided in the machine direction.
- a respective flexible pressure strip is preferably simultaneously tiltable about an axis extending in particular transversely to the machine direction.
- At least three contact pressures are associated with a respective flexible and preferably tiltable contact pressure bar, preferably at least one contact pressure being provided in the forward direction and rearward area being provided around at least one contact pressure in the middle area of the contact pressure bar.
- At least one pressure strip has a smooth or closed or open, in particular a grooved, a blind drilled and / or a perforated surface facing the sieves.
- At least one pressure bar is provided with a change covering on its surface facing the screens.
- the successive in the machine direction direction Anpressologicaln conveniently have the same measured width in the machine direction, wherein the measured distance in the machine direction between the pressure bars is preferably less than or equal to the measured in the machine direction width of a respective pressure bar.
- the distance measured in the machine direction between the contact pressure strips can advantageously amount to 0.15 times to 0.35 times the width of a respective pressure strip.
- the twin-wire former can advantageously be designed as a hybrid former or as a gap former.
- the Anpressologicaln can be provided in particular as a kind of shoe of the Gapformers. With such a shoe, there is the possibility of using rolls of smaller diameter and the advantage of a defined and adjustable impingement zone and a shortening of the free jet length. An appropriate combination of these - -
- Characteristics leads to a lasting improvement in the beam quality and the layer purity of multilayer headboxes.
- the dewatering time in the area of Siebzusammenograph- tion is thus realized by means of particularly wide Anpressologicaln.
- the drainage time is significantly extended by the wider pressure strips.
- the dewatering performance of the subsequent upper vacuum suction zone can be correspondingly increased.
- higher machine speeds can be achieved.
- the dewatering pulses in this area can be optimally controlled.
- Figure 1 is a partial schematic representation of a hybrid former with, for example, two arranged in the region of Siebzusammen exchange pressure bars through which in the present case, for example, the lower wire is pressed against the upper wire.
- 2 shows a schematic partial view of a gap former with, for example, two pressure bars arranged in the region of the sieve junction, by means of which, in the present case, for example, the lower sieve is again pressed against the upper sieve;
- Fig. 3 is a comparable to Fig.
- FIG. 2 representation of a Gapformers, but in the present case by the Anpressangn the upper wire is pressed against the lower wire;
- 4 shows a schematic illustration of a tiltable contact pressure bar with, for example, two associated contact pressures which are at a distance from one another in the machine running direction;
- Fig. 5 is a schematic representation of a flexible in the machine direction pressing bar with, for example, three associated, in the machine direction a distance from each other having compressions.
- 1 to 3 each show a schematic representation of a twin-wire former of a machine for producing a fibrous web, in particular a paper or board web, from a fibrous stock suspension.
- twin-wire formers each comprise a continuous endless lower sieve 10 and a continuous endless upper sieve 12, which are brought together to form a twin-wire zone 14 into which the pulp suspension supplied by a headbox 16 is finally introduced.
- one of the two wires 10, 12 is pressed against the other wire in the area of the screen merge by pressing strips 18, 20 extending generally transversely to the machine direction MD.
- two contact strips 18, 20 are provided in the region of the screen merge, which preferably describe a radius R in the range from 400 to 10,000 mm.
- the incoming and outgoing tangent points of the respective pressure strip 18, 20 may be wrapped in a range of 0.1 to 5.0 ° of the at least one sieve 10, 12. In principle, however, any other number of pressure bars is conceivable.
- the contact strips 18, 20 can extend in the transverse direction, for example, at least substantially over the entire machine width or be divided in the direction of the width in several sub-strips.
- the pressure strips 18, 20 can be used, for example, as a kind of shoe of the gap former 28. - -
- the pressing strips 18, 20 are each viewed in the machine direction MD one or more successive contact pressures 22 (see Figures 1 to 3) or 22 ', 22 "(see Fig. 4) and 22' to 22 '" (see Fig. 5) assigned.
- the contact pressures can be subdivided in the transverse direction, for example, into several partial contact pressures.
- the measured in the machine direction MD width of the contact strips 18, 20 is> 30 mm and is preferably in a range of about 45 to about 180 mm.
- the value of the product of the width of a respective pressure strip 18, 20 in mm and the machine speed in m / min is favorably> 25,000, preferably> 30,000.
- the sieve 10, 12 facing surface of a respective pressure bar 18, 20 may viewed in the machine direction MD have a constant radius of curvature or different radii of curvature.
- the constant radius of curvature or the first radius of curvature of the surface of a respective pressure strip 18, 20 is expediently chosen such that the sieve pressed against the other sieve by the pressure strip 18, 20 is almost or at least essentially tangential to the front strip section runs in the area of the front edge of the groin or at least slightly wraps around the front edge of the groin.
- associated contact pressures 22; 22 ', 22 ", 22' to 22 '" may, for example, be pneumatic contact pressures.
- the contact strips 18, 20 may each have a sieve 10, 12 facing smooth or closed surface. In principle, however, such embodiments are also conceivable in which the pressure strips 18, 20 each have a sieve 10, 12 facing open surface. In this case, the relevant surface of the pressure bars 18, 20 in particular grooved, blind drilled, perforated and / or the like. In principle, for example, such embodiments are conceivable in which the pressure bars 18, 20 are provided on their the screens 10, 12 facing surface in each case with a removable covering.
- the pressing bars 18, 20 following one another in the machine direction MD can in particular have the same width measured in the machine direction MD.
- the distance between the contact pressure bars 18, 20 measured in the machine direction MD is preferably less than or equal to the width of a respective pressure strip 18, 20 measured in the machine direction MD.
- the distance between the pressure bars 18, 20 measured in the machine direction MD is preferably 0.15-. times up to 0.35 times the width of a respective pressure strip 18, 20.
- the twin-wire former is designed, for example, as a hybrid former 26.
- the pulp suspension delivered by the head box 16 is first applied to the lower wire 10 before the two wires 10, 12 are brought together.
- the fibrous suspension passes into the twin-wire zone, in which, as can be seen from FIG. 1, a top sieve suction box 24 can be provided, which is provided in machine direction MD according to the pressure bars 18, 20 provided in the region of the sieve junction is.
- pressure bars 18, 20 press the lower wire 10 against the upper wire 12 and are arranged correspondingly in the loop of the lower wire 10, these pressure bars 18, 20 may in principle be arranged in the loop of the upper wire 12 to this upper wire 12 against to press the lower wire 10.
- the twin-wire former is designed as a gap former 28.
- the pulp suspension delivered by the head box 16 is introduced directly into the region of the entry gap 30 of the twin-wire zone 14 formed by the two screens 10, 12.
- the pressing strips 18, 20 provided in the region of the screen consolidation are arranged in the present case, for example, within the loop of the lower wire 10, so that the lower wire 10 is pressed against the upper wire 12 by these strips.
- the two screens 10, 12 are guided around a forming roller 32.
- Fig. 3 shows a comparable with the Fig. 2 representation of the Gapformers 28, wherein in the present case by the Anpressologicaln 18, 20, however, the upper wire 12 is pressed against the lower wire 10.
- the contact strips 18, 20 are thus arranged here within the loop of the upper wire.
- this embodiment according to FIG. 3 has at least substantially the same structure as that of FIG. 2, with corresponding reference numerals being assigned to corresponding parts.
- FIG. 4 shows a schematic representation of a tiltable pressure strip 18, 20 with, for example, two associated contact pressures 22 ', 22 ", which are spaced apart in the machine direction MD, by appropriate action via the contact pressures 22', 22", the relevant pressure strip 18, 20, for example, be tilted about an axis extending transversely to the machine direction MD axis.
- the contact pressure 22 " can be applied to a greater extent than the contact pressure 22 'or vice versa
- the resulting tilting movement is indicated by arrows in FIG.
- At least one contact pressure 22 'or 22 " can be provided in the front and rear region of the tiltable pressure bar 18, 20 viewed in the machine direction MD, wherein in the present exemplary embodiment in the two areas in each case one such Pressing 22 'or 22 "is provided.
- Fig. 5 shows a schematic representation of a flexible in the machine direction MD pressure bar 18, 20 with, for example, three associated, in the machine direction MD a distance from each other having contact pressures 22 '- 22' ".
- a contact pressure 22 'or 22 "in the machine direction MD considered front and rear and for example a contact pressure 22" in the central region of the pressure bar 18, 20 are provided.
- the contact pressures 22 '- 22 " may in particular be pneumatic contact pressures, wherein the various contact pressures 22' - 22 '" may each comprise at least one contact pressure hose. In the present embodiment, each of the three contact pressures 22 '- 22 "' in each case such a pressure hose.
- the flexible pressure strip 18, 20 can be deformed in the desired manner, for example, by applying the mean contact pressure 22 '' more than the two other contact pressures 22 ', 22 ". In principle, any other different loading of the various contact pressures 22 '- 22 "' possible.
- a respective flexible pressure strip 18, 20 can be tilted simultaneously about an axis which extends in particular transversely to the machine direction MD.
- tilting can in particular also take place via corresponding contact pressures, here for example the two outer contact pressures 22 'and 22 "
- the contact pressures 22 '- 22 "' in particular be provided again as a pneumatic contact pressures and, for example, each comprise at least one pressure hose.
Landscapes
- Paper (AREA)
- Thermal Transfer Or Thermal Recording In General (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102007000771A DE102007000771A1 (de) | 2007-09-26 | 2007-09-26 | Doppelsiebformer |
| PCT/EP2008/062418 WO2009043727A1 (de) | 2007-09-26 | 2008-09-18 | Doppelsiebformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2205792A1 true EP2205792A1 (de) | 2010-07-14 |
| EP2205792B1 EP2205792B1 (de) | 2011-01-26 |
Family
ID=40317039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08804360A Not-in-force EP2205792B1 (de) | 2007-09-26 | 2008-09-18 | Doppelsiebformer |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2205792B1 (de) |
| AT (1) | ATE497057T1 (de) |
| DE (2) | DE102007000771A1 (de) |
| WO (1) | WO2009043727A1 (de) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4002304A1 (de) * | 1990-01-26 | 1991-08-14 | Escher Wyss Gmbh | Former in einer papiermaschine |
| DE4402274C2 (de) | 1994-01-27 | 1995-04-06 | Voith Gmbh J M | Doppelsiebpartie |
| DE102005037643A1 (de) * | 2005-08-05 | 2007-02-08 | Voith Patent Gmbh | Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn |
| DE102005041554A1 (de) | 2005-08-31 | 2007-03-01 | Voith Patent Gmbh | Doppelsiebformer und Entwässerungsschuh einer Maschine zur Herstellung einer Faserstoffbahn |
| DE102005047347A1 (de) * | 2005-09-30 | 2007-04-12 | Voith Patent Gmbh | Verfahren zur Herstellung einer Faserstoffbahn und Blattbildungssystem zur Durchführung des Verfahrens |
-
2007
- 2007-09-26 DE DE102007000771A patent/DE102007000771A1/de not_active Withdrawn
-
2008
- 2008-09-18 DE DE502008002514T patent/DE502008002514D1/de active Active
- 2008-09-18 EP EP08804360A patent/EP2205792B1/de not_active Not-in-force
- 2008-09-18 WO PCT/EP2008/062418 patent/WO2009043727A1/de not_active Ceased
- 2008-09-18 AT AT08804360T patent/ATE497057T1/de active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2009043727A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ATE497057T1 (de) | 2011-02-15 |
| EP2205792B1 (de) | 2011-01-26 |
| DE502008002514D1 (de) | 2011-03-10 |
| DE102007000771A1 (de) | 2009-04-02 |
| WO2009043727A1 (de) | 2009-04-09 |
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