EP0576798B2 - Doppelsiebformer - Google Patents
Doppelsiebformer Download PDFInfo
- Publication number
- EP0576798B2 EP0576798B2 EP93106775A EP93106775A EP0576798B2 EP 0576798 B2 EP0576798 B2 EP 0576798B2 EP 93106775 A EP93106775 A EP 93106775A EP 93106775 A EP93106775 A EP 93106775A EP 0576798 B2 EP0576798 B2 EP 0576798B2
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire
- guide surface
- twin
- accordance
- former
- 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
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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
Definitions
- twin wire former is part of a paper machine and essentially serves one on one permeable sieve surface spread out, for paper production to dewater certain fiber suspension and the constituents contained in the suspension to distribute or arrange in the desired form.
- the invention is based on the subject of the document D1, from which a twin wire former of the following design is described:
- a bottom wire runs over one curved formation shoe, the wire guide surface formed by strips that are not individually adjustable, or by using an equivalent Panel with openings or slots.
- the formation shoe can be swiveled stored and adjustable by means of a lifting device.
- twin-wire zone begins, i.e. a top sieve is running from here on together with the lower sieve and with the one between the two sieves paper stock through the twin wire former.
- twin wire zone a drainage of the paper stock both down and take place upwards.
- the invention has for its object a To create twin wire formers with which the formation is very evenly possible and set in a wide range can be.
- the equipment effort should be kept as low as possible.
- a twin wire former is known from the publication D4, in which the lower wire is led through several individual strips. Each of these individual strips rests on an elastic force element, which in turn is supported on a table is. In a variant, this table is also on elastic force elements supported. The force with which each bar is pressed against the bottom wire is individually adjustable. The wire run along this individually controllable strips can be flat, curved or wavy. About the last However, the variant mentioned does not specify D4.
- the design according to the invention has the object of Document D4 the additional advantage that the number of elastic required Force elements per formation shoe is only two. Usually there is only one only formation shoe available, so only a total of two force elements.
- the license plate can still contain a lot of water and therefore also very sensitive suspension layer gentle and be dewatered if the formation is good.
- the invention does not become the guide surface for the first sieve about rigidly positioned, but by one essentially force directed against the sieve, i.e. non-positive pressed against the bottom wire loop, the so applied force essentially the fabric tension of the first sieve, partly that of the second sieve and the Weight forces supported.
- the advantage of the invention comes particularly to be used when other parts in contact with the sieve are in immediate Neighborhood of the frictionally guided Guide surface are rigidly positioned.
- the shoe can also with an uneven suspension height dodge on the sieve ("soft nip entrance"). All of this results in a soft formation, such as especially with writing and printing paper is in demand. But other types of paper also require one good leaf uniformity.
- twin wire former By choosing the fabric tension and the radii of curvature the twin wire former is optimal match the desired paper quality.
- the one lying in the second sieve Guide surface the opposite direction of curvature on. In this area it can still contained water is particularly effective due to suction support into a suction roll or a suction box be directed.
- the suction box can one, in the running direction seen, included from the lying suction gap, that in the area of the curved in the first sieve Management area is sufficient and thus in the area before reversing the direction of curvature.
- Twin wire formers can in many cases be a suction box in the second sieve, i.e. he must not be adjustable in the operation of the system, or it a fixed suction roller can also be provided be. Often it becomes independent accordingly the fabric tension and the set support force for the guiding surface in the first sieve is sufficient, around the elements of the twin wire former in the desired Way to position relative to each other without further management areas are changed in their position. Of course, is also in front of the yielding guide surface another rigidly positioned drainage system conceivable.
- Fig. 1 shows schematically an embodiment of the twin wire former according to the invention.
- a moving one endless first sieve 1, here first as a fourdrinier is carried out via a headbox 5 with a suspension layer 3 provided, which then one Part of the water contained through the first sieve 1 emits which the suspension layer lying on it 3 leads to the subsequent sheet formation area, which on a curved guide surface 4 over a Siebenisch 12 lies.
- the sieve table 12 is both in front as well as at the back, seen in the direction of the sieves, supported by force elements 9 and is against the sieves movable (double arrows).
- the second sieve 2 is called Upper screen in the sheet formation area mentioned approximately tangentially on the suspension layer on the first screen 1 3 forwarded, it being from this Contact line from essentially the shape of the first Adjust sieves.
- the suction box installed in the second sieve 6 leads water up through the second sieve 2 from. (The water is indicated by arrows in this figure.) It is essentially behind the sheet formation area 5 arranged, but can at least partially its effect also in the sheet formation area. Because the one facing the second sieve Guide surface 7 of the suction box 6 a different direction Has curvature than in the sheet formation area, takes place - seen in the direction of rotation of the twin wire - a reversal of curvature.
- Fig.3 a little more detailed but still shown schematically, you can see in this example one of the ways the curved guide surface 4 to design.
- the strips 13 are on the sieve table 12 arranged and shaped so that the entirety their surfaces facing the first sieve 1 are convex formed contour. It is expedient also the area of the individual strips themselves with one Radius of curvature provided, which is the radius of curvature corresponds approximately to the guide surface 4.
- Deformable packing elements are shown as force elements 9, that can be filled with a print medium. In this way a force can be found in these elements generate which in the intended operating range as far as possible from the position of the sieve table 12 is independent.
- the pressure in one is through pipes connected with those serving as force elements 9 Pressure vessel 15 applied.
- This arrangement is also able to compensate for hydraulic oscillations To dampen line resistance. If necessary the packing can also be used with different pressures be charged.
- the part of the twin wire former shown can also be designed as a suction box means that the water between the ledges 13 after is sucked down.
- Fig.1 the example of a hybrid former 2 shows a so-called gap former. This does not apply the Fourdrinier section, and the headbox 5 'leads the Suspension directly as a wide jet in the area of Sieve union.
- Another variant is here the curved guide surface 4 instead of strips generated by a plate 13 ', also the force elements 9 are designed as springs.
- the sheet formation area can be different be designed.
- E.g. 4 shows a number of Moldings rigidly connected to each other in groups each group in turn - both initially, as well as seen at the end in the direction of wire travel - force elements 9 has.
- pressure bars which are partially rigidly interconnected and each with its own power elements. Furthermore here is the guide surface 7 for the second sieve 2 formed by a suction roller 17.
- FIG. 7 and 8 show very schematically that the invention Twin wire former also a vertical former can be.
- the suspension becomes essentially vertically between sieves 1 and 2 as a wide jet injected.
- the guide surface 4 of the first Sieves 1 In the area of merging the sieve is the guide surface 4 of the first Sieves 1.
- the water is removed through both sieves.
- the adjoining guide surface 7 can be formed by a suction or forming roll.
- Fig. 8 it is shown that in the special case can have the same direction of curvature as the previous one Guide surface 4.
Landscapes
- Paper (AREA)
- Organic Insulating Materials (AREA)
- Liquid Crystal Substances (AREA)
Description
- Fig. 1
- schematische Darstellung des Erfindungsgegenstandes als Hybridformer
- Fig. 2
- schematische Darstellung des Erfindungsgegenstandes als Gapformer
- Fig. 3
- schematische Detailansicht vom Erfindungsgegenstand
- Fig. 4-6
- schematische Detailansichten weiterer Ausgestaltungen
- Fig. 7+8
- schematische Darstellung des Erfindungsgegenstandes als Vertikalformer
Claims (16)
- Doppelsiebformer mit einem ersten Sieb (1) und einem zweiten Sieb (2), wobei auf dem ersten Sieb (1) eine Suspensionsschicht (3) gebildet wird und das erste Sieb (1) zusammen mit der Suspensionsschicht (3) in einen auf einer in Sieblaufrichtung zumindest teilweise gekrümmten Führungsfläche (4) gebildeten Blattbildungsbereich geführt wird, wobei die Führungsfläche (4) für das erste Sieb (1) durch einen mit im wesentlichen quer zur Laufrichtung sich erstreckende Leisten (13) versehenen Schuh (12) oder durch eine mit Öffnungen oder Schlitzen versehene Platte (13') gebildet wird, bei dem ferner das zweite Sieb (2) im Bereich der gekrümmten Führungsfläche (4) für das erste Sieb (1) in Kontakt mit der auf dem ersten Sieb (1) befindlichen Suspensionsschicht (3) gebracht wird, und bei dem auf der der Suspensionsschicht gegenüberliegenden Seite des zweiten Siebes (2) eine nachfolgende entgegengesetzt gekrümmte Führungsfläche (7) für das zweite Sieb (2) vorhanden ist, durch die hindurchgetretenes Wasser abgesaugt werden kann,
dadurch gekennzeichnet, daß der Schuh (12) bzw. die Platte 13') im wesentlichen in Richtung zum ersten Sieb hin und von ihm weg bewegbar und kraftschlüssig abgestützt ist, und zwar mit Hilfe von elastischen Kraftelementen (9), die - wie an sich bekannt - verformbar und mit einem unter Druck stehenden Medium gefüllt sind. - Doppelsiebformer nach Anspruch 1, dadurch gekennzeichnet, daß der Schuh (12) bzw. die Platte (13') in Richtung zu dem Sieb (1) so geführt ist, daß sich sein Winkel relativ zur Umgebung nicht ändert.
- Doppelsiebformer nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der Schuh (12) bzw. die Platte (13') Teil eines Saugkastens ist.
- Doppelsiebformer nach Anspruch 1, 2 oder 3, dadurch gekennzeichnet, daß sowohl am Anfang als auch am Ende des Schuhes (12) bzw. der Platte (13') in Sieblaufrichtung gesehen, jeweils wenigstens ein Kraftelement (9) vorhanden ist.
- Doppelsiebformer nach Anspruch 1, dadurch gekennzeichnet, daß die Oberfläche der Leisten (13) eine Krümmung aufweist, die im wesentlichen der Gesamtkrümmung der Führungsfläche (4) entspricht.
- Doppelsiebformer nach Anspruch 1, dadurch gekennzeichnet, daß die im zweiten Sieb (2) befindliche Führungsfläche (7) in ihrer Lage fixiert ist, wie an sich bekannt.
- Doppelsiebformer nach Anspruch 1, dadurch gekennzeichnet, daß die im zweiten Sieb (2) befindliche Führungsfläche (7) als Saugkasten (6) ausgebildet ist, mit dessen Hilfe das hindurchgetretene Wasser abgeführt werden kann, wie an sich bekannt.
- Doppelsiebformer nach Anspruch 7, dadurch gekennzeichnet, daß die Führungsfläche (7) des Saugkastens (6) durch mit im wesentlichen quer zur Laufrichtung sich erstreckende Leisten gebildet wird, wie an sich bekannt.
- Doppelsiebformer nach Anspruch 8, dadurch gekennzeichnet, daß die Oberfläche der Leisten eine Krümmung aufweist, die im wesentlichen der Gesamtkrümmung dieser Führungsfläche (7) entspricht.
- Doppelsiebformer nach Anspruch 8, dadurch gekennzeichnet, daß eine in Laufrichtung gesehen erste geschlossene Leiste den Beginn der Führungsfläche (7) am Saugkasten (6) bildet und - wie an sich bekannt - eine Krümmung aufweist, deren Krümmungsrichtung entgegen der der davor im ersten Sieb (1) liegenden Führungsfläche (4) ist.
- Doppelsiebformer nach Anspruch 10, dadurch gekennzeichnet, daß die in Laufrichtung gesehen erste geschlossene Leiste in Laufrichtung gesehen mindestens doppelt so lang wie die folgenden Leisten ist.
- Doppelsiebformer nach Anspruch 1, dadurch gekennzeichnet, daß die im zweiten Sieb (2) befindliche Führungsfläche (7) durch eine Saugwalze gebildet wird, mit deren Hilfe das hindurchgetretene Wasser abgeführt werden kann.
- Doppelsiebformer nach Anspruch 1, dadurch gekennzeichnet, daß die im zweiten Sieb (2) befindliche Führungsfläche (7), wie an sich bekannt, durch eine Formierwalze gebildet wird, mit deren Hilfe das hindurchgetretene Wasser abgeführt werden kann.
- Doppelsiebformer nach Anspruch 1, dadurch gekennzeichnet, daß ein erster im zweiten Sieb (2) befindlicher Saugschlitz (8) unmittelbar nach dem Zusammenlaufen der beiden Siebe (1 und 2), also innerhalb des Bereiches der Führungsfläche (4) angeordnet ist.
- Doppelsiebformer nach Anspruch 1, dadurch gekennzeichnet, daß sich im ersten Sieb (1) vor der gekrümmten Führungsfläche (4) und getrennt von ihr mindestens eine weitere das erste Sieb (1) berührende ortsfeste Führungsfläche befindet, wie an sich bekannt.
- Doppelsiebformer nach Anspruch 1, dadurch gekennzeichnet, daß Dämpfer vorhanden sind zur Dämpfung von Vertikalschwingungen der vertikal beweglichen gekrümmten Führungsfläche (4) im ersten Sieb (1).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4219292A DE4219292A1 (de) | 1992-06-12 | 1992-06-12 | Doppelsiebformer |
DE4219292 | 1992-06-12 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0576798A1 EP0576798A1 (de) | 1994-01-05 |
EP0576798B1 EP0576798B1 (de) | 1996-07-17 |
EP0576798B2 true EP0576798B2 (de) | 1999-03-17 |
Family
ID=6460898
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93106775A Expired - Lifetime EP0576798B2 (de) | 1992-06-12 | 1993-04-27 | Doppelsiebformer |
Country Status (5)
Country | Link |
---|---|
US (1) | US5635032A (de) |
EP (1) | EP0576798B2 (de) |
JP (1) | JPH0657682A (de) |
AT (1) | ATE140498T1 (de) |
DE (2) | DE4219292A1 (de) |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19648850A1 (de) * | 1996-11-26 | 1998-05-28 | Voith Sulzer Papiermasch Gmbh | Saugvorrichtung und Pressenpartie einer Papiermaschine sowie Verfahren zum Besaugen eines Bahnabschnitts einer Papiermaschine |
FI965277A (fi) | 1996-12-31 | 1998-07-01 | Valmet Corp | Paperikoneen imulaatikko ja menetelmä paperikoneen imulaatikossa |
AU2003300338B2 (en) * | 2003-12-22 | 2008-01-24 | Astenjohnson, Inc. | Hybrid type forming section for a paper making machine |
AU2005309866B2 (en) * | 2004-11-23 | 2008-11-06 | Astenjohnson, Inc. | Twin wire gap former paper making machine with variable wrap impingement shoe |
WO2010048240A1 (en) * | 2008-10-21 | 2010-04-29 | Astenjohnson, Inc. | Twin fabric forming section with multiple drainage shoes |
DE102009027432A1 (de) * | 2009-07-02 | 2011-01-05 | Voith Patent Gmbh | Formiereinheit und Verfahren zur Herstellung einer Materialbahn |
DE102010031169A1 (de) * | 2010-07-09 | 2012-01-12 | Voith Patent Gmbh | Blattbildungssystem für eine Maschine zur Herstellung einer zumindest einschichtigen Faserstoffbahn |
DE102015224390A1 (de) * | 2015-12-07 | 2016-12-29 | Voith Patent Gmbh | Saugkasten innerhalb einer Papiermaschine |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3585105A (en) * | 1967-05-26 | 1971-06-15 | Beloit Corp | Anti-deflection drain board method and apparatus |
DE3131957A1 (de) * | 1981-07-24 | 1983-02-10 | Escher Wyss Gmbh, 7980 Ravensburg | Entwaesserungseinheit fuer langsieb-papiermaschinen |
GB2143871B (en) * | 1983-07-23 | 1986-11-12 | Beloit Walmsley Ltd | Twin wire paper forming machine |
FI851035L (fi) * | 1984-05-03 | 1985-11-04 | Beloit Corp | Oevre formningsvira i en pappersmaskin. |
CA1245900A (en) * | 1984-05-18 | 1988-12-06 | Norman A. Stock | Vibration forming shoe for a twin wire former |
FI885606A (fi) * | 1988-12-01 | 1990-06-02 | Ahlstroem Valmet | Banformningsfoerfarande och anordning. |
FI98540C (fi) * | 1989-05-08 | 1997-07-10 | Valmet Corp | Laite paperi- tai kartonkirainan muodostamiseksi kuitumateriaalista |
JPH038889A (ja) * | 1989-06-06 | 1991-01-16 | Mitsubishi Heavy Ind Ltd | 抄紙機の湿紙形成装置 |
DE3927597A1 (de) * | 1989-08-22 | 1991-02-28 | Voith Gmbh J M | Doppelsieb-former |
DE4026953C2 (de) * | 1990-01-26 | 1995-11-30 | Escher Wyss Gmbh | Entwässerungsvorrichtung und Verfahren zur Entwässerung an einem Doppelsiebformer |
DE4002304A1 (de) * | 1990-01-26 | 1991-08-14 | Escher Wyss Gmbh | Former in einer papiermaschine |
DE4005420C2 (de) * | 1990-02-21 | 1995-06-08 | Voith Gmbh J M | Doppelsiebformer |
US5034098A (en) * | 1990-02-23 | 1991-07-23 | Beloit Corporation | Method of forming a paper web |
DE4037017C2 (de) * | 1990-11-20 | 1994-12-08 | Escher Wyss Gmbh | Naßteil einer Doppelsieb-Papiermaschine |
DE4107653A1 (de) * | 1991-03-09 | 1992-09-10 | Escher Wyss Gmbh | Entwaesserungseinrichtung fuer die nasspartie einer papiermaschine |
DE4141607C2 (de) * | 1991-12-17 | 1996-04-25 | Voith Gmbh J M | Doppelsiebformer |
DE9115632U1 (de) * | 1991-12-17 | 1992-11-12 | J.M. Voith Gmbh, 7920 Heidenheim | Doppelsiebformer |
-
1992
- 1992-06-12 DE DE4219292A patent/DE4219292A1/de not_active Ceased
-
1993
- 1993-04-27 EP EP93106775A patent/EP0576798B2/de not_active Expired - Lifetime
- 1993-04-27 DE DE59303237T patent/DE59303237D1/de not_active Expired - Lifetime
- 1993-04-27 AT AT93106775T patent/ATE140498T1/de not_active IP Right Cessation
- 1993-06-10 JP JP5138601A patent/JPH0657682A/ja active Pending
-
1995
- 1995-04-12 US US08/422,006 patent/US5635032A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0657682A (ja) | 1994-03-01 |
DE4219292A1 (de) | 1993-12-16 |
EP0576798A1 (de) | 1994-01-05 |
EP0576798B1 (de) | 1996-07-17 |
DE59303237D1 (de) | 1996-08-22 |
US5635032A (en) | 1997-06-03 |
ATE140498T1 (de) | 1996-08-15 |
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