EP0497932B1 - Slot nozzle, especially for a twin-wire former - Google Patents
Slot nozzle, especially for a twin-wire former Download PDFInfo
- Publication number
- EP0497932B1 EP0497932B1 EP91913352A EP91913352A EP0497932B1 EP 0497932 B1 EP0497932 B1 EP 0497932B1 EP 91913352 A EP91913352 A EP 91913352A EP 91913352 A EP91913352 A EP 91913352A EP 0497932 B1 EP0497932 B1 EP 0497932B1
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- EP
- European Patent Office
- Prior art keywords
- wire
- twin
- former
- slot
- section
- 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
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Classifications
-
- 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
-
- 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
- the invention relates to a twin wire former of a paper or board machine according to the preamble of claim 1.
- the twin-wire former of the type mentioned above has a slot nozzle, sometimes also called an autoslice, for removing the white water emerging through the top wire from the suspension layer to be dewatered and formed between the screens. While the white water is relatively easy to drain down from the lower sieve, using gravity, the white water has to be drained from the upper sieve against gravity, essentially vertically upwards. With the kinetic energy of the water moving at the speed of the sieves, the water rises along a wall in the way of the slot nozzle and can be skimmed off and removed from the upper sieve, possibly using a vacuum.
- EP 0 373 133 A2 shows a generic twin wire former with a slot nozzle with two walls running across the width of the wire and transverse to the wire. The rear of these walls touches the top sieve and has a fixed position.
- twin wire formers and their use are known, for example, from the following publications:
- twin wire former according to EP 0 289 445, a long shoe is first arranged on the lower wire.
- the upstream white water cannot be removed directly from the top sieve by the downstream slot nozzle.
- the formation of the upper side of the suspension is not improved by pressure pulses.
- DE-PS 11 16 967 shows water-removing guide elements and pacifiers, which remove the white water upwards, but are not suitable for controlling the formation.
- a primary and a secondary autoslice are present, which are set rigidly with respect to the top sieve, and the suspension layer to be formed can be crushed and damaged.
- the distance between the slot nozzles and the top sieve is considerable, which can lead to undesirable fog formation.
- the object of the invention is to provide a twin wire former which has an upwardly clean and reliably functioning slot nozzle, with which it is possible to exert several pressure impulses which support a good formation and act on the surface of the suspension, whereby the adjustment of the slot nozzle to the top sieve, ie can be automatically adjusted simultaneously to its position at different thicknesses of the suspension layer between the sieves.
- the adjustment of the slot nozzle to the top sieve ie can be automatically adjusted simultaneously to its position at different thicknesses of the suspension layer between the sieves.
- the slot nozzle should also be used to advantage in the production of so-called heavy types of paper or cardboard (e.g. liner board, corrugated material, etc.).
- the slot nozzle 1 which is used in a twin wire former 2 of a paper or board machine, is primarily intended for removing the white water from the upper wire 3 of the twin wire former. It has a water-carrying space 4, which is formed between two walls 5 and 6 running across the entire width of the sieve 3.
- the front wall 5 in the running direction of the screen is shorter in the direction of the screen 3 than the rear wall 6, which in its operating position extends to the screen 3, with a between the lower edge of the shorter front wall 5 and the screen 3 Gap 7 exists.
- the rear wall 6 has two horizontally extending parts 8 and 9.
- the upper part 8 is fixed in the operating position and the lower part 9, which faces the sieve 3, is designed and arranged as a diaphragm which is displaceable along the upper part and partially overlapping it.
- This part 9 is adjustable both in the direction of the screen 3 and in the direction away from the screen 3. In the respectively set position, the part 9 is elastically supported in the direction against the sieve 3 on the upper, fixed part 8.
- the servomotor according to the exemplary embodiment shown here has two pressure chambers, an upper pressure chamber 22, which is provided for the movement of the lower part 9 upwards, and a lower pressure chamber 23, which for the movement of the lower part 9 downwards in the direction of the screen 3 is provided.
- the rooms 22 and 23 are lined with tight but elastic hoses that can be pressurized with a medium.
- the pressure is supported elastically so that the lower edge 25 of the lower part 9 facing the screen 3, which is provided with a wear-resistant material layer 24, can follow a changing position of the screen 3. This position changes during operation when the thickness of the suspension layer changes.
- the adjustment is done automatically.
- the white water rises through the water-carrying space 4 and flows into a collecting space 26, from which it flows out through an opening 27.
- the collecting room can be created in front of or behind room 4.
- a compact dewatering unit can be put together from the individual slot nozzles, which can also be adjusted as a whole unit relative to the screen.
- FIG. 2 shows an example of a twin wire former 2 with slot nozzles 1 according to the invention. It has a support plane which is defined by the arrangement and shape of support elements 11 to 13 or 14 to 17. These support elements are of a known type and serve both to discharge the white water downwards and to introduce pressure pulses onto the lower side of the suspension layer to be formed between the upper sieve 3 and the lower sieve 18, which run along the support plane.
- a number of slot nozzles 1, in operation the upper sieve 3 is arranged in contact, in each case one slot nozzle on the section which is delimited by the respectively adjacent support elements 11 and 12, or 12 and 13 is, in each case in the wire running direction behind the support element 11, or 12, or 13.
- the section equipped with the support nozzles 1 is followed by a section equipped with a press shoe 19 of known type, in which 18 additional support elements 14 to 15 in the area on the bottom wire of the press shoe 19 are arranged.
- the suspension is injected between the screens at the location between the breast rolls 20 and 21 through a headbox nozzle 28.
- the upper breast roll 20 is a full roll
- the lower breast roll 21 is an open roll which receives and removes white water.
- FIG. 3 Another possible arrangement of the jet region is shown in FIG. 3 with a headbox 28 'essentially forming a jet upwards on a breast roller 21', in the centrifugal region of which the first suction nozzle is effective.
- twin-wire former which, in contrast to the previously described in the running direction of the wires, first arranged a press shoe (like 19) on the top wire, which section is followed by a section equipped with a few slot nozzles (like 1).
- a support structure 29 is advantageous, to which the individual elements can be attached or moved.
Abstract
Description
Die Erfindung betrifft einen Doppelsiebformer einer Papier- oder Kartonmaschine gemäß dem Oberbegriff des Anspruchs 1.The invention relates to a twin wire former of a paper or board machine according to the preamble of
Der Doppelsiebformer der oben genannten Art weist eine Schlitzdüse auf, gelegentlich auch Autoslice genannt, zum Abführen des durch das Obersieb heraus aus der zwischen den Sieben zu entwässernden und zu formierenden Suspensionsschicht austretenden Siebwassers. Während dabei das Siebwasser von dem unteren Sieb nach unten, schon unter Ausnützung der Schwerkraft, relativ leicht abzuführen ist, muß das Siebwasser von dem Obersieb gegen die Schwerkraft, im wesentlichen vertikal nach oben abgeführt werden. Mit der kinetischen Energie des mit der Geschwindigkeit der Siebe sich bewegenden Wassers steigt das Wasser entlang einer im Wege stehenden Wand der Schlitzdüse und kann, eventuell unter Vakuumeinsatz, von dem Obersieb abgeschöpft und abgeführt werden.The twin-wire former of the type mentioned above has a slot nozzle, sometimes also called an autoslice, for removing the white water emerging through the top wire from the suspension layer to be dewatered and formed between the screens. While the white water is relatively easy to drain down from the lower sieve, using gravity, the white water has to be drained from the upper sieve against gravity, essentially vertically upwards. With the kinetic energy of the water moving at the speed of the sieves, the water rises along a wall in the way of the slot nozzle and can be skimmed off and removed from the upper sieve, possibly using a vacuum.
Die EP 0 373 133 A2 zeigt einen gattungsgemäßen Doppelsiebformer mit einer Schlitzdüse mit zwei quer zu dem Sieb über die Breite des Siebes verlaufenden Wänden. Die hintere dieser Wände berührt das Obersieb und hat dabei eine feste Position.EP 0 373 133 A2 shows a generic twin wire former with a slot nozzle with two walls running across the width of the wire and transverse to the wire. The rear of these walls touches the top sieve and has a fixed position.
In der US 4,648,943 wird ein Doppelsiebformer dargestellt mit Formierschuhen im Ober- und Untersieb, welche in eine Vibrationsbewegung versetzt werden können. Dabei bildet der im Obersieb liegende Vibrationsschuh zwar die Rückwand einer Schlitzdüse, das Nachgeben dieser so gestalteten Rückwand in Richtung von dem Sieb weg ist aber nicht vorgesehen.In US 4,648,943 a twin wire former is shown with forming shoes in the top and bottom wire, which can be set in a vibration movement. The vibrating shoe located in the upper sieve forms the rear wall of a slot nozzle, but there is no provision for this rear wall designed in this way to yield in the direction away from the sieve.
Verschiedene andere Formen von Doppelsiebformern und ihre Anwendung sind z.B. aus folgenden Druckschriften bekannt:Various other forms of twin wire formers and their use are known, for example, from the following publications:
Bei dem Doppelsiebformer gemäß EP 0 289 445 ist zuerst ein langer Schuh am Untersieb angeordnet. Das nach oben anstehende Siebwasser kann durch die nachgeschaltete Schlitzdüse nicht unmittelbar vom Obersieb entfernt werden. Außerdem wird die Formation der Suspensions-Oberseite nicht durch Druckimpulse verbessert.In the twin wire former according to EP 0 289 445, a long shoe is first arranged on the lower wire. The upstream white water cannot be removed directly from the top sieve by the downstream slot nozzle. In addition, the formation of the upper side of the suspension is not improved by pressure pulses.
Die DE-PS 11 16 967 zeigt wasserabführende Leitelemente und Schnabelsauger, welche das Siebwasser nach oben entfernen, nicht aber geeignet sind, die Formation zu kontrollieren.DE-PS 11 16 967 shows water-removing guide elements and pacifiers, which remove the white water upwards, but are not suitable for controlling the formation.
Gemäß EP 0 136 000 sind ein Primär- und ein Sekundär-Autoslice vorhanden, die starr zum Obersieb eingestellt sind, wobei die zu formierende Suspensionsschicht zerquetscht und geschädigt werden kann. Außerdem ist der Abstand der Schlitzdüsen zum Obersieb erheblich, was zu unerwünschter Nebelbildung führen kann.According to EP 0 136 000, a primary and a secondary autoslice are present, which are set rigidly with respect to the top sieve, and the suspension layer to be formed can be crushed and damaged. In addition, the distance between the slot nozzles and the top sieve is considerable, which can lead to undesirable fog formation.
In der PCT/FI 86/00012 ist ein Doppelsiebformer mit Schlitzdüsen, die in das Sieb eindrücken. Auch bei dieser Form und Fahrweise besteht die Gefahr des möglichen Verdrückens der zu formierenden Faserschicht.In the PCT / FI 86/00012 there is a twin wire former with slot nozzles that press into the wire. With this shape and driving style, too, there is a risk of the fiber layer to be formed being deformed.
Bei solchem Stand der Technik ist die Aufgabe der Erfindung, einen Doppelsiebformer zu schaffen, der eine nach oben sauber und verläßlich funktionierende Schlitzdüse aufweist , mit dem es möglich ist, mehrere, eine gute Formation unterstützende, auf die Oberfläche der Suspension wirkende Druckimpulse auszuüben, wobei sich die Einstellung der Schlitzdüse zum Obersieb, d.h. zu dessen Lage bei verschiedenen Dicken der Suspensionsschicht zwischen den Sieben gleichzeitig automatisch anpassen läßt. Dazu soll es möglich sein, eine Langsiebpartie einer Papiermaschine zu einer Doppelsiebpartie relativ einfach umzurüsten. Die Schlitzdüse soll auch bei Herstellung von sogenannten schweren Papier- oder Kartonsorten (z.B. Linerboard, Wellenstoff usw.) mit Vorteil einsetzbar sein.In such prior art, the object of the invention is to provide a twin wire former which has an upwardly clean and reliably functioning slot nozzle, with which it is possible to exert several pressure impulses which support a good formation and act on the surface of the suspension, whereby the adjustment of the slot nozzle to the top sieve, ie can be automatically adjusted simultaneously to its position at different thicknesses of the suspension layer between the sieves. For this purpose, it should be possible to convert a four-wire section of a paper machine into a double-wire section relatively easily. The slot nozzle should also be used to advantage in the production of so-called heavy types of paper or cardboard (e.g. liner board, corrugated material, etc.).
Diese Aufgaben werden mit dem erfindungsgemäßen Doppelsiebformer gemäß dem kennzeichnenden Teil des Patentanspruchs 1 erfüllt.These objects are achieved with the twin wire former according to the invention in accordance with the characterizing part of
In den Unteransprüchen sind vorteilhafte Ausführungsbeispiele der erfindungsgemäßen Schlitzdüse angegeben. In anderen Unteransprüchen sind Anwendungsbeispiele der erfindungsgemäßen Schlitzdüse beschrieben.Advantageous exemplary embodiments of the slot nozzle according to the invention are specified in the subclaims. In other subclaims, application examples of the slot nozzle according to the invention are described.
Im weiteren wird der Erfindungsgegenstand und die mit ihm erzielbaren Vorteile näher beschrieben und erklärt. Die Beschreibung bezieht sich auf eine Zeichnung, in der schematisch zeigen:
- Fig. 1
- ein Ausführungsbeispiel der Schlitzdüse in größerem Maßstab, und
- Fig. 2
- ein Beispiel eines Doppelsiebformers mit erfindungsgemäßen Schlitzdüsen
- Fig. 3
- ein weiteres Beispiel mit variierter Anordnung des Stoffauflaufes.
- Fig. 1
- an embodiment of the slot nozzle on a larger scale, and
- Fig. 2
- an example of a twin wire former with slot nozzles according to the invention
- Fig. 3
- another example with a varied arrangement of the headbox.
Die Schlitzdüse 1, die in einem Doppelsiebformer 2 einer Papier- oder Kartonmaschine ihre Anwendung findet, ist vornehmlich zum Abführen des Siebwassers von dem Obersieb 3 des Doppelsiebformers vorgesehen. Sie weist einen wasserführenden Raum 4 auf, der zwischen zwei quer zu dem Sieb 3 über die ganze Breite des Siebes verlaufenden Wänden 5 und 6 gebildet ist. Die in der Laufrichtung des Siebes vordere Wand 5 ist hier in Richtung zu dem Sieb 3 kürzer als die hintere Wand 6, welche in ihrer Betriebsposition bis zu dem Sieb 3 reicht, wobei zwischen der unteren Kante der kürzeren vorderen Wand 5 und dem Sieb 3 ein Spalt 7 besteht. Die hintere Wand 6 weist zwei horizontal verlaufende Teile 8 und 9 auf. Der obere Teil 8 steht in der Betriebsposition fest und der untere, zu dem Sieb 3 weisende Teil 9 ist als eine entlang dem oberen Teil als ein zu ihm verschiebbare, ihn teilweise überlappende Blende ausgebildet und angeordnet. Dieser Teil 9 ist sowohl in Richtung zu dem Sieb 3 wie auch in Richtung von dem Sieb 3 weg einstellbar verschiebbar. In der jeweils eingestellten Position ist der Teil 9 in Richtung gegen das Sieb 3 an dem oberen, feststehenden Teil 8 elastisch abgestützt.The
Zum Verschieben und elastischen Abstützen des unteren Teils 9 ist ein zwischen dem oberen Teil 8 und dem unteren Teil 9 angeordneter Stellmotor 10 vorgesehen. Der Stellmotor nach dem hier gezeigten Ausführungsbeispiel hat zwei Druckräume, einen oberen Druckraum 22, der für die Bewegung des unteren Teils 9 nach oben vorgesehen ist, und einen unteren Druckraum 23, der für die Bewegung des unteren Teils 9 nach unten in Richtung zum Sieb 3 hin vorgesehen ist. Die Räume 22 und 23 sind mit dichten, aber elastischen Schläuchen ausgekleidet, die mit einem Medium unter Druck beaufschlagbar sind. Der Drurck ist elastisch abgestützt, so daß die untere, dem Sieb 3 zugewandte Kante 25 des unteren Teils 9, die mit einer verschleißfesten Materialschicht 24 versehen ist, einer sich ändernden Lage des Siebes 3 folgen kann. Diese Lage ändert sich beim Betrieb, wenn sich die Dicke der Suspensionsschicht ändert.To move and resiliently support the
Die Anpassung erfolgt automatisch.The adjustment is done automatically.
Das Siebwasser steigt durch den wasserführenden Raum 4 nach oben und fließt in einen Sammelraum 26, aus welchem es durch eine Öffnung 27 ausfließt. Je nach Platzverhältnissen kann der Sammelraum vor oder hinter dem Raum 4 angelegt sein.The white water rises through the water-carrying
Aus den einzelnen Schlitzdüsen läßt sich im Bedarfsfall eine kompakte Entwässerungseinheit zusammenstellen, die auch als ganze Einheit relativ zu dem Sieb verstellbar sein kann.If required, a compact dewatering unit can be put together from the individual slot nozzles, which can also be adjusted as a whole unit relative to the screen.
Anhand der Fig. 2 ist ein Beispiel eines Doppeisiebformers 2 mit erfindungsgemäßen Schlitzdüsen 1 gezeigt. Er weist eine Stützebene auf, welche durch die Anordnung und Form von Stützelementen 11 bis 13, bzw. 14 bis 17 definiert ist. Diese Stützelemente sind bekannter Art und dienen sowohl der Abführung des Siebwassers nach unten als auch zum Einbringen von Druckimpulsen autdie untere Seite der zu formierenden Suspensionsschicht zwischen dem Obersieb 3 und dem Untersieb 18, die entlang der Stützebene umlaufen. In Laufrichtung der Siebe 3 und 18 am Anfang der Formationsstrecke ist eine Anzahl der Schlitzdüsen 1, beim Betrieb das Obersieb 3 berührend angeordnet, dabei jeweils eine Schlitzdüse an dem Abschnitt, der von den jeweils benachbarten Stützelementen 11 und 12, bzw. 12 und 13 begrenzt ist, und zwar jeweils in Sieblaufrichtung hinter dem Stützelement 11, bzw. 12, bzw. 13. Dem mit den Stützdüsen 1 bestückten Abschnitt folgt ein mit einem Preßschuh 19 bekannter Art bestückter Abschnitt, in dem am Untersieb 18 weitere Stützelemente 14 bis 15 im Bereich des Preßschuhs 19 angeordnet sind. Die Suspension wird zwischen die Siebe an der Stelle zwischen den Brustwalzen 20 und 21 durch eine Düse 28 eines Stoffauflaufs eingespritzt. Die obere Brustwalze 20 ist eine Vollwalze, die untere Brustwalze 21 ist eine offene Walze, die Siebwasser aufnimmt und abführt.2 shows an example of a twin wire former 2 with
Eine andere mögliche Anordnung des Strahlbereiches zeigt Fig. 3 mit einem im wesentlichen einen Strahl nach oben bildenden Stoffauflauf 28' an einer Brustwalze 21', in deren Schleuderbereich die erste Saugdüse wirksam wird.Another possible arrangement of the jet region is shown in FIG. 3 with a headbox 28 'essentially forming a jet upwards on a breast roller 21', in the centrifugal region of which the first suction nozzle is effective.
Die Anordnung der das Siebwasser abführenden oder Druckimpulse ausübenden Elemente, Schlitzdüsen, Preßschuhe, Stützelemente, Leisten usw. ist im Bereich der Entscheidung des Fachmanns. Verschiedene Kombinationen der Anordnung sowie Auswahl dieser Elemente sind in konkret zu lösendem Fall möglich und notwendig und dementsprechend vorteilhaft. Das gleiche gilt für die Wahl der Stützebene, ob sie gerade, wellenartig steigend oder sinkend sein soll.The arrangement of the elements which discharge the white water or exert pressure impulses, slot nozzles, press shoes, support elements, strips, etc. is within the scope of the decision of the person skilled in the art. Different combinations of the arrangement and selection of these elements are possible and necessary in a specific case to be solved and are accordingly advantageous. The same applies to the choice of the support level, whether it should be straight, rising or falling.
So ist z.B. ein Doppelsiebformer vorstellbar, der im Unterschied zum vorher beschriebenen in Laufrichtung der Siebe zuerst einen Preßschuh (wie 19) am Obersieb angeordnet hat, welchem Abschnitt ein mit einigen Schlitzdüsen (wie 1) bestückter Abschnitt folgt.For example, a twin-wire former is conceivable, which, in contrast to the previously described in the running direction of the wires, first arranged a press shoe (like 19) on the top wire, which section is followed by a section equipped with a few slot nozzles (like 1).
Um solche vorteilhaften Kombinationen schneller realisieren zu können, z.B. eine Umrüstung, ist eine Trägerkonstruktion 29 vorteilhaft, an der die einzelnen Elemente jeweils zu befestigen oder verschiebbar sind.In order to be able to implement such advantageous combinations more quickly, e.g. retrofitting, a
Claims (10)
- A twin-wire former (2) for a paper-making or board-making machine, with an upper wire (3), a lower wire (18) and a slot nozzle (1) for removing the white water from the upper wire (3) of the former, which nozzle has a water-guiding space (4) which is formed between two walls (5 and 6) running transversely to the wire (3) across the width of the wire, with the front wall (5) in the direction of travel of the wire being at a distance from the wire so that there is a gap (7) between the lower edge of the front wall (5) and the wire, with the rear wall (6) in its operating position extending as far as the wire, and with a guide surface being present on the side of the wires (3, 18) opposite the slot nozzle, characterised in that the rear wall (6) is elastically supported in the position set in each case in the direction towards the wire and has two parts (8 and 9) which are arranged substantially above one another and are movable relative to each other, the upper part (8) being fixed in the operating position and the lower part (9) which points towards the wire being designed and arranged along the upper one as a diaphragm which can be displaced theretowards and partly overlaps it and is adjustably displaceable both towards the wire and away from the wire.
- A twin-wire former (2) according to Claim 1, characterised in that the guide surface is designed to be elastic.
- A twin-wire former (2) according to Claim 2, characterised in that an automatic control means for the position of the wires is present between the elastic slot nozzle and the elastic guide surface.
- A twin-wire former (2) according to Claim 1, characterised in that a servo motor (10) is provided for displacing and elastically supporting the lower part (9).
- A twin-wire former (2) according to Claim 1, characterised in that the lower edge (25), which points towards the wire, of the lower part (9) is provided with a wear-resistant layer of material (24).
- A twin-wire former (2) according to one of the preceding claims, with a supporting surface predetermined by the arrangement and form of supporting elements (11, 12, 13 and 14, 15, 16, 17), along which surface the wires, the upper wire (3) and lower wire (18), are guided with the layer of suspension which is to be formed and dewatered, characterised in that a number of the slot nozzles (1) is arranged in the direction of travel at the beginning of the forming section, each contacting the upper wire (3), with a slot nozzle (1) in each case being provided on the wire section between two adjacent supporting elements (11 and 12, or 12 and 13) forming at least part of the guide surface, or in the direction of travel in each case after the supporting element (11, or 12, or 13), with a section equipped with a press shoe (19) following the section equipped with the slot nozzles, in that additional supporting elements (14, 15, 16 and 17) are arranged on the lower wire (18) in the region of the press shoe (19).
- A twin-wire former (2) according to one of Claims 1 to 5, with a supporting surface predetermined by the arrangement and form of supporting elements (11, 12, 13 and 14, 15, 16, 17), along which surface the wires, the upper wire (3) and lower wire (18), are guided with the layer of suspension which is to be formed and dewatered, characterised in that a section equipped with a press shoe (19) is arranged in the direction of travel at the beginning of the forming section, in that supporting elements (14, 15, 16 and 17) are present on the lower wire (18) in the region of the press shoe (19), a number of the slot nozzles (1) following this section which are each arranged contacting the upper wire (3), with one slot nozzle (1) being provided in each case on the wire section between two adjacent additional supporting elements (11 and 12, or 12 and 13) which form at least part of the guide surface, or is provided in the direction of travel in each case after the supporting element (11, or 12, or 13).
- A twin-wire former (2) according to Claim 6, characterised in that breast rolls (20 and 21) are mounted before the section equipped with the slot nozzles (1), of which rolls the upper one (20) is a solid roll and the lower one (21) an open roll which removes white water.
- A twin-wire former (2) according to Claim 4, characterised in that the servomotor (10) has two pressure chambers (22, 23) which are lined in sealing fashion with tubes of elastic material, which tubes can be supplied with a pressure medium.
- A twin-wire former in a paper-making or board-making machine having a plurality of slot nozzles according to Claim 1, characterised in that in each case a plurality of slot nozzles (1) is adjustable, combined in a structural unit, relative to the wire which they contact.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4028126 | 1990-09-05 | ||
| DE4028126A DE4028126C2 (en) | 1990-09-05 | 1990-09-05 | Slot nozzle, in particular for a twin wire former and their use in a twin wire former |
| PCT/DE1991/000611 WO1992004500A1 (en) | 1990-09-05 | 1991-07-30 | Slot nozzle, especially for a twin-wire former |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0497932A1 EP0497932A1 (en) | 1992-08-12 |
| EP0497932B1 true EP0497932B1 (en) | 1996-02-14 |
Family
ID=6413634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91913352A Expired - Lifetime EP0497932B1 (en) | 1990-09-05 | 1991-07-30 | Slot nozzle, especially for a twin-wire former |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0497932B1 (en) |
| AT (1) | ATE134233T1 (en) |
| CA (1) | CA2050647A1 (en) |
| DE (2) | DE4028126C2 (en) |
| FI (1) | FI97306C (en) |
| WO (1) | WO1992004500A1 (en) |
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|---|---|---|---|---|
| DE29619709U1 (en) * | 1996-11-13 | 1997-01-09 | Voith Sulzer Papiermasch Gmbh | Screen section of a paper machine |
| DE19651241A1 (en) * | 1996-12-10 | 1998-06-18 | Voith Sulzer Papiermasch Gmbh | Double fourdrinier pulp water extraction |
| FI991356A (en) * | 1999-06-14 | 2000-12-15 | Valmet Corp | Procedure for removing water in the wire portion of a cellulose machine and drainage unit |
| GB0030682D0 (en) | 2000-12-15 | 2001-01-31 | Astenjohnson Inc | Suction assisted skimmer blade |
| GB2370046A (en) | 2000-12-15 | 2002-06-19 | Astenjohnson Inc | Adjustable resilient blade support |
| AT503404A1 (en) * | 2006-04-13 | 2007-10-15 | Bartelmuss Klaus Ing | METHOD FOR CONTROLLING THE TEMPERATURE OF THE CERAMIC ELEMENTS OF A SUPPORTING DEVICE DIVIDING STRIP IN A PAPER PRODUCTION PLANT AND DEVICE AND SUPPORTING DEVICE. SPREADING STRIP FOR CARRYING OUT THIS PROCEDURE |
| DE102007035488A1 (en) * | 2007-07-28 | 2009-01-29 | Voith Patent Gmbh | Process for producing a fibrous web and twin-wire former for carrying out the process |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2143871B (en) * | 1983-07-23 | 1986-11-12 | Beloit Walmsley Ltd | Twin wire paper forming machine |
| WO1986000012A1 (en) * | 1984-06-07 | 1986-01-03 | Design & Industry Pty. Limited | Eyeshield |
| GB2174120B (en) * | 1985-04-26 | 1988-08-10 | Doerries Gmbh | Apparatus for guiding the wires of a twin wire forming section of a paper or cardboard machine |
| GB8710428D0 (en) * | 1987-05-01 | 1987-06-03 | Beloit Corp | Multi-ply web forming apparatus |
| FI77281C (en) * | 1987-06-18 | 1989-02-10 | Valmet Paper Machinery Inc | HYBRIDFORMARE FOER EN PAPPERSMASKIN. |
| FI85885C (en) * | 1987-11-25 | 1992-06-10 | Tampella Oy Ab | FOERFARANDE FOER FORMERING AV EN FIBERBANA I EN PAPPERSMASKIN SAMT EN ANORDNING FOER UTFOERING AV FOERFARANDET. |
| FI84637C (en) * | 1988-12-01 | 1991-12-27 | Valmet Paper Machinery Inc | FOERFARANDE OCH ANORDNING VID FORMNING AV PAPPERS- ELLER KARTONGBANA. |
| DE3842155A1 (en) * | 1988-12-15 | 1990-06-21 | Voith Gmbh J M | DOUBLE SCREEN FORM FOR PRODUCING A PAPER SHEET |
-
1990
- 1990-09-05 DE DE4028126A patent/DE4028126C2/en not_active Revoked
-
1991
- 1991-07-30 EP EP91913352A patent/EP0497932B1/en not_active Expired - Lifetime
- 1991-07-30 WO PCT/DE1991/000611 patent/WO1992004500A1/en active IP Right Grant
- 1991-07-30 AT AT91913352T patent/ATE134233T1/en not_active IP Right Cessation
- 1991-07-30 DE DE59107409T patent/DE59107409D1/en not_active Expired - Fee Related
- 1991-09-04 CA CA002050647A patent/CA2050647A1/en not_active Abandoned
-
1992
- 1992-04-23 FI FI921813A patent/FI97306C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| DE4028126A1 (en) | 1992-03-19 |
| ATE134233T1 (en) | 1996-02-15 |
| FI97306B (en) | 1996-08-15 |
| DE59107409D1 (en) | 1996-03-28 |
| CA2050647A1 (en) | 1992-03-13 |
| WO1992004500A1 (en) | 1992-03-19 |
| DE4028126C2 (en) | 1993-10-14 |
| EP0497932A1 (en) | 1992-08-12 |
| FI921813A (en) | 1992-04-23 |
| FI921813A0 (en) | 1992-04-23 |
| FI97306C (en) | 1996-11-25 |
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