EP0515964B1 - Twin wire former for a papermaking machine - Google Patents
Twin wire former for a papermaking machine Download PDFInfo
- Publication number
- EP0515964B1 EP0515964B1 EP92108479A EP92108479A EP0515964B1 EP 0515964 B1 EP0515964 B1 EP 0515964B1 EP 92108479 A EP92108479 A EP 92108479A EP 92108479 A EP92108479 A EP 92108479A EP 0515964 B1 EP0515964 B1 EP 0515964B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire
- loop
- twin wire
- horizontal
- twin
- 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
- 210000000481 breast Anatomy 0.000 claims description 3
- 238000009432 framing Methods 0.000 claims 2
- 239000011888 foil Substances 0.000 claims 1
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 description 16
- 241001295925 Gegenes Species 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 241001136792 Alle Species 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011089 mechanical engineering Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 210000002023 somite Anatomy 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/001—Wire-changing arrangements
-
- 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 for a paper machine according to the preamble of claim 1.
- a twin wire former has to meet numerous requirements. Above all, he is expected to form a good sheet, ie that the sheet is of integrity, for example with regard to the fiber distribution, the transparency and the uniform weight per unit area over the width. These requirements therefore concern the paper to be produced. Other requirements concern the mechanical engineering part. So the twin wire former should be as simple as possible to keep the manufacturing costs low. Is very important Furthermore, that the twin wire former is designed to be inexpensive in terms of its functions. It is important, for example, that the large amounts of water are discharged properly and reliably. The sieves must be able to be cleaned perfectly, they should be subject to as little wear as possible, so that they can be dewatered even after prolonged use.
- twin wire former should be designed in such a way that the machine crew can take all necessary measures easily and quickly, and that as little personnel as possible is required for this. So the drainage elements should be easily accessible, so that they are also easily interchangeable or adjustable. This is precisely not the case with known twin wire formers.
- the headbox is constantly soiled. As an important part of the paper machine, it must be cleaned regularly. It is desirable to arrange it so that it is less dirty and that it is also easily accessible for cleaning and other operation.
- a very important requirement is to keep the dimensions of the twin wire former - including the headbox - as small as possible.
- the possibility of extensions should also be considered.
- the invention has for its object to design a twin wire former according to the generic term such that it meets the requirements mentioned in their entirety, i.e. a good sheet is that it fulfills its functions, especially with regard to water drainage and screen cleaning, that it is easy to use, in particular that its critical parts are easily accessible and that it is as small as possible.
- the twin-wire former shown therein for a paper machine has two screens 1, 2, namely a lower screen 1 and an upper screen 2. Both screens each form a closed loop.
- the screens 1, 2 together form a wedge-shaped inlet gap 3. This is preceded by a headbox 4, about which more will be said later.
- Both screens loop around a plurality of rollers and other internals.
- the particularly important elements in the bottom wire are to be mentioned: a forming roller 5, a dewatering unit 6 with dewatering strips 7, a separating suction device 8, a further dewatering body 9, which also has dewatering strips 10, a sieve suction roller 11, a blowing nozzle 12 and also tensioning rollers 13 and 14.
- a forming roller 5 a dewatering unit 6 with dewatering strips 7, a separating suction device 8, a further dewatering body 9, which also has dewatering strips 10, a sieve suction roller 11, a blowing nozzle 12 and also tensioning rollers 13 and 14.
- the more important internals or accessories of the top wire 2 are as follows: a breast roll 20, a blow nozzle 21, a tensioning roll 22, a tensioning roll 23 and a dewatering unit 24. This in turn has a plurality of dewatering strips 25, furthermore a skimmer 26, a first one Suction zone 27 and a second suction zone 28.
- the frame comprises a frame which is essentially in the shape of an inverted U, comprising a front support 30, a rear support 31 and an upper beam 32. It is understood that such a frame is arranged on both sides of the machine, i.e. on the driver side and the drive side. Of course, only one of these two frames can be seen in the present illustration.
- the chair comprises a lower beam 33. This side view extends in this side view on both sides beyond the rear support 31. In the drawing on the left, it protrudes into the space defined by the U-shaped frame. On the other hand, it extends far beyond the frame, approximately to the end of the loop of the lower sieve 1. In this end region it is supported by a further support 34.
- the dewatering unit 6, which is assigned to the lower sieve 1 is supported by the left end of the bar 33 in the drawing, and that the dewatering unit 24, which is assigned to the upper sieve 2, is attached to the bar 32 .
- This contributes particularly to the optimal use of space.
- sheet formation zone should essentially be understood to mean that area of the two screens 1 and 2 which is located between the point at which these two screens van der Formierwalze 5 and the point of impact on the Vacuum cleaner extends.
- the supports 30, 31, 34 are provided with removable sections, and possibly also the bar 32.
- the headbox 4 is constructed in a known manner. It comprises a distributor 4.1, which extends transversely to the running direction of the screens, furthermore tube bundle sections 4.2 and 4.3.
- the main part of the headbox namely the tube bundle sections 4.2 and 4.3, on the one hand, and the sheet formation zone, at least along the drainage strips 7 and the drainage strips 25, roughly viewed along a diagonal, which roughly corresponds to the lower left corner of the U -shaped frame and the upper right corner of this frame connects together.
- the beginning of the sheet formation zone and thus the beginning of the drainage strips 7, 25 is located essentially in the center of area of the area defined by the frame 30, 31, 32.
- Such an arrangement is particularly space-saving and at the same time optimal with regard to the functioning of the entire system and optimal with regard to ease of use.
- the headbox 4.1 is largely protected against contamination in the form of spraying material suspensions. The reason for this is as follows: if a vertical plane is passed through the forming roller 5, the headbox 4.1 is on one side of this plane, while the sheet formation zone is on the other side.
- the lower bar 33 extends only as far into the space defined by the U-frame as is necessary to support the lower drainage unit 6.
- the hanging the upper drainage unit 24 on the upper beam 32 means that again no supports or beams are required which take up valuable space within the frame. At the same time, this gives good access to the critical parts, namely to the drainage units 6 and 24.
Landscapes
- Paper (AREA)
Description
Die Erfindung betrifft einen Doppelsiebformer für eine Papiermaschine gemäß dem Oberbegriff von Anspruch 1.The invention relates to a twin wire former for a paper machine according to the preamble of
Doppelsiebformer für Papiermaschinen sind in großer Vielfalt und mit vielen Abwandlungen bekannt geworden. Auf die folgenden Veröffentlichungen wird verwiesen:
- (1) DE 39 10 892 A 1 beschreibt einen Doppelsiebformer, der im wesentlichen alle Merkmale des Oberbegriffes von
Anspruch 1 enthält. Eine Stuhlung ist dort nicht gezeigt, aber dennoch vorhanden, wie der Fachman weiß. Die Formierwalze hat einen perforierten Mantel. Die Blattbildungszone weist einen ersten, gekrümmten Abschnitt auf, bei dem eine Vielzahl von Querleisten (quer zur Sieblaufrichtung) innerhalb der unteren Siebschlaufe angeordnet sind. Auch innerhalb der oberen Siebschlaufe befinden sich Entwässerungselemente. Dabei verläuft die Blattbildungszone unter einem geringen Winkel gegen die Horizontale. - (2) DE 39 27 597 A 1 beschreibt mehrere Varianten von Doppelsiebformern. Bei der Variante gemäß
Figur 1 hat die Blattbildungszone ebenfalls die Gestalt eines Kreisbogens mit sehr großem Krümmungsradius. Der Anfangsbereich dieser Blattbildungszone ist ebenfalls geringfügig gegen die Horizontale geneigt. Bei den Varianten gemäß der Figuren 2 und 3 verläuft die Blattbildungszone im wesentlichen vertikal ansteigend. - (3) US-PS 3 846 232 beschreibt einen Doppelsiebformer mit einem Stoffauflauf, dessen Auslaufkanal unter einem Winkel von etwa 30 Grad gegen die Horizontale ansteigt. Der Stoffstrahl wird sodann zwischen zwei Sieben eingehüllt, die eine Formierwalze umschlingen und diese - gemeinsam mit der dazwischen befindlichen Faserstoffbahn unter einem Winkel von ca. 30 Grad gegen die Vertikale verlassen. Die Blattbildungszone verläuft von dort ab somit sehr steil nach oben.
- (4) Der Aufsatz "Speed-Former HS" aus 1988 annual meeting technical section, CPPA, beschreibt einen Doppelsiebformer, bei welchem der Stoffstrahl - ähnlich wie bei (3) schräg von unten nach oben in den Einlaufspalt zwischen zwei Sieben injiziert wird, und bei dem die beiden Siebe mit der dazwischen befindlichen Bahn die Formierwalze unter einem recht steilen Winkel verlassen. Man erkennt hierbei einen Teil der Stuhlung, die horizontale Balken und vertikale Stützen umfaßt.
- (1) DE 39 10 892 A 1 describes a twin wire former which essentially contains all the features of the preamble of
claim 1. A chair is not shown there, but is still there, as the specialist knows. The forming roller has a perforated jacket. The sheet formation zone has a first, curved section, in which a plurality of transverse strips (transverse to the direction of wire travel) are arranged within the lower wire loop. There are also drainage elements inside the upper sieve loop. The sheet formation zone runs at a slight angle to the horizontal. - (2) DE 39 27 597 A 1 describes several variants of twin wire formers. In the variant according to FIG. 1, the sheet formation zone also has the shape of an arc with a very large radius of curvature. The initial area of this sheet formation zone is also slightly inclined to the horizontal. In the variants according to FIGS. 2 and 3, the sheet formation zone extends essentially vertically.
- (3) US Pat. No. 3,846,232 describes a twin wire former with a headbox, the outlet channel of which rises at an angle of approximately 30 degrees to the horizontal. The material jet is then enveloped between two sieves, which wrap around a forming roller and leave this - together with the fibrous web in between - at an angle of approximately 30 degrees to the vertical. From there the sheet formation zone runs very steeply upwards.
- (4) The article "Speed-Former HS" from 1988 annual meeting technical section, CPPA, describes a twin-wire former in which the material jet - similar to (3) - is injected obliquely from bottom to top into the inlet gap between two screens, and in which the two screens with the web in between leave the forming roller at a rather steep angle. You can see a part of the chair, which includes horizontal beams and vertical supports.
Ein Doppelsiebformer hat zahlreiche Anforderungen zu erfüllen. Vor allem wird von ihm erwartet, daß er ein gutes Blatt bildet, d.h., daß das Blatt von einwandfreier Qualität ist, z.B. bezüglich der Faserverteilung, der Durchsicht sowie des gleichmäßigen Flächengewichtes über die Breite. Dieser Anforderungen betreffen somit das zur produzierende Papier. Andere Anforderungen betreffen den maschinenbaulichen Teil. So soll der Doppelsiebformer möglichst einfach im Aufbau sein, um die Herstellungskosten niedrig zu halten. Ganz wichtig ist ferner, daß der Doppelsiebformer im Hinblick auf seine Funktionen entsprechend günstig gestaltet ist. Dabei ist zum Beispiel wichtig, daß die großen Wassermengen einwandfrei und zuverlässig abgeführt werden. Die Siebe müssen tadellos gereinigt werden können, sie sollen einem möglichst geringen Verschleiß unterliegen, so daß sie auch noch nach längerem Gebrauch entwässerungsfähig sind.A twin wire former has to meet numerous requirements. Above all, he is expected to form a good sheet, ie that the sheet is of impeccable quality, for example with regard to the fiber distribution, the transparency and the uniform weight per unit area over the width. These requirements therefore concern the paper to be produced. Other requirements concern the mechanical engineering part. So the twin wire former should be as simple as possible to keep the manufacturing costs low. Is very important Furthermore, that the twin wire former is designed to be inexpensive in terms of its functions. It is important, for example, that the large amounts of water are discharged properly and reliably. The sieves must be able to be cleaned perfectly, they should be subject to as little wear as possible, so that they can be dewatered even after prolonged use.
Besonders wichtig ist der Bedienungskomfort. Der Doppelsiebformer soll derart gestaltet sein, daß die Maschinenbesatzung leicht und schnell alle notwendigen Maßnahmen ergreifen kann, und daß hierzu möglichst wenig Personal notwendig ist. So sollen die Entwässerungselemente leicht zugänglich sein, so daß sie auch leicht austauschbar oder verstellbar sind. Gerade dies ist bei bekannten Doppelsiebformern nicht der Fall. Der Stoffauflauf unterliegt ständig einer Verschmutzung. Er muß als wichtiges Teil der Papiermaschine regelmäßig gereinigt werden. Dabei ist es wünschenswert, ihn so anzuordnen, daß er weniger verschmutzt, und daß er außerdem zum Zwecke der Reinigung und sonstigen Bedienung leicht zugänglich ist.Ease of use is particularly important. The twin wire former should be designed in such a way that the machine crew can take all necessary measures easily and quickly, and that as little personnel as possible is required for this. So the drainage elements should be easily accessible, so that they are also easily interchangeable or adjustable. This is precisely not the case with known twin wire formers. The headbox is constantly soiled. As an important part of the paper machine, it must be cleaned regularly. It is desirable to arrange it so that it is less dirty and that it is also easily accessible for cleaning and other operation.
Ein ganz wichtiges Erfordernis ist es, die Abmessungen des Doppelsiebformers - eingeschlossen den Stoffauflauf - so klein wie möglich zu halten. Dabei ist auch an die Möglichkeit von Erweiterungen zu denken.A very important requirement is to keep the dimensions of the twin wire former - including the headbox - as small as possible. The possibility of extensions should also be considered.
Die bekannten Doppelsiebformer haben jeweils einem oder mehreren dieser Anforderungen genügt. Dabei hat sich jedoch immer wieder gezeigt, daß es schwierig ist, allen Wünschen gerecht zu werden. Insbesondere das Erfordernis des Raumbedarfes wurde nicht genügend beachtet.The known twin wire formers each met one or more of these requirements. However, it has always been shown that it is difficult to meet all wishes. In particular, the need for space was not sufficiently taken into account.
Der Erfindung liegt die Aufgabe zugrunde, einen Doppelsiebformer gemäß dem Gattungsbegriff derart zu gestalten, daß er den genannten Anforderungen in ihrer Gesamtheit genügt, d.h. ein gutes Blatt bildet, daß er seinen Funktionen gerecht wird, vor allem bezüglich der Wasserabfuhr und der Siebreinigung, daß er bedienungsfreundlich ist, insbesondere, daß seine kritischen Teile leicht zugänglich sind, und daß er möglichst kleine Abmessungen aufweist.The invention has for its object to design a twin wire former according to the generic term such that it meets the requirements mentioned in their entirety, i.e. a good sheet is that it fulfills its functions, especially with regard to water drainage and screen cleaning, that it is easy to use, in particular that its critical parts are easily accessible and that it is as small as possible.
Diese Aufgabe wird gemäß den kennzeichnenden Merkmalen von Anspruch 1 gelöst.This object is achieved in accordance with the characterizing features of
Aus den kennzeichnenden Merkmalen ergeben sich im einzelnen die folgenden Vorteile:
- a) Der gewählte Winkel von 30 bis 50 Grad gegen die Horizontale stellt ein Optimum bezüglich der Raumausnützung und der Blattbildung dar. Durch das schräge Ansteigen der Blattbildungszone wird einerseits etwas an Länge eingespart und statt dessen etwas Höhe beansprucht, die jedoch im allgemeinen vorhanden ist. Andererseits wird der Einfluß der Schwerkraft verringert, der bei horizontalen Blattbildungszonen gegeben ist, und der die unerwünschte Zweiseitigkeit begünstigt.
- b) Die besondere Gestaltung der Stuhlung ermöglicht eine besonders optimale Raumausnutzung.
- c) Das Aufhängen der Entwässerungselemente des oberen Siebes am oberen Balken und das Abstützen der Entwässerungselemente des unteres Siebes am unteren Balken sind für die Raumausnutzung besonders wichtig.
Eine besonders günstige Lösung ist jene gemäß derAnsprüche 4 und 5. Dabei ist die optimale Lösung jene, bei welcher der Hauptkörper des Stoffauflaufes sowie der Hauptteil der Blattbildungszone - ganz grob gesehen - eine Diagonale bilden, die sich im U-förmigen Stuhlungsrahmen befindet und die sich praktisch von der einen unteren Ecke des U-förmigen Stuhlungsrahmen bis zur gegenüberliegenden oberen Ecke hin erstreckt.
- a) The selected angle of 30 to 50 degrees to the horizontal represents an optimum in terms of space utilization and sheet formation. The sloping rise of the sheet formation zone saves a bit of length on the one hand and takes up some height instead, which is generally present. On the other hand, the influence of gravity which is present in horizontal sheet formation zones and which favors the undesirable two-sidedness is reduced.
- b) The special design of the chair enables a particularly optimal use of space.
- c) The hanging of the drainage elements of the upper sieve on the upper beam and the support of the drainage elements of the lower sieve on the lower beam are particularly important for the space utilization.
A particularly favorable solution is that according toclaims 4 and 5. The optimal solution is that in which the main body of the headbox and the main part of the sheet formation zone - roughly speaking - form a diagonal, which is located in the U-shaped frame and the extends practically from a lower corner of the U-shaped frame to the opposite upper corner.
Die Erfindung ist anhand der Zeichnung näher erläutert. Der darin dargestellte Doppelsiebformer für eine Papiermaschine weist zwei Siebe 1, 2 auf, nämlich ein Untersieb 1 und ein Obersieb 2. Beide Siebe bilden jeweils eine geschlossene Schlaufe. Die Siebe 1, 2 bilden miteinander einen keilförmigen Einlaufspalt 3. Diesem ist ein Stoffauflauf 4 vorgeschaltet, über den später noch mehr gesagt werden soll. Beide Siebe umschlingen eine Mehrzahl von Walzen und sonstigen Einbauten. Dabei sind im Untersieb die besonders wichtigen Elemente zu nennen: Eine Formierwalze 5, eine Entwässerungseinheit 6 mit Entwässerungsleisten 7, ein Trennsauger 8, ein weiterer Entwässerungskörper 9, der ebenfalls Entwässerungsleisten 10 aufweist, eine Siebsaugwalze 11, eine Blasdüse 12 sowie Siebspannwalzen 13 und 14. Man erkennt weitere Einbauelemente bzw. Zubehörteile, die jedoch in diesem Zusammenhang von geringerer Bedeutung sind.The invention is explained in more detail with reference to the drawing. The twin-wire former shown therein for a paper machine has two
Die wichtigeren Einbauten bzw. Zubehörteile des Obersiebes 2 sind die folgenden: Eine Brustwalze 20, eine Blasdüse 21, eine Spannwalze 22, eine Spannwalze 23 sowie eine Entwässerungseinheit 24. Diese weist wiederum eine Mehrzahl von Entwässerungsleisten 25 auf, ferner einen Skimmer 26, eine erste Saugzone 27 und sowie eine zweite Saugzone 28.The more important internals or accessories of the top wire 2 are as follows: a
Die Gestaltung der Stuhlung ist besonders wichtig. Die Stuhlung umfaßt einen Rahmen, der im wesentlichen die Gestalt eines umgekehrten U hat, umfassend eine vordere Stütze 30, eine hintere Stütze 31 sowie einen oberen Balken 32. Es versteht sich, daß ein solcher Rahmen auf beiden Seiten der Maschine angeordnet ist, d.h. auf der Führerseite und der Triebseite. In der vorliegenden Darstellung erkennt man natürlich nur einen einzigen dieser beiden Rahmen. Die Stuhlung umfaßt als einziges wesentliches weiteres Element einen unteren Balken 33. Dieser erstreckt sich in dieser Seitenansicht gesehen nach beiden Seiten über die hintere Stütze 31 hinaus. In der Zeichnung links ragt er somit in den Raum hinein, der durch den U-förmigen Rahmen definiert ist. Auf der anderen Seite erstreckt er sich weit über den Rahmen hinaus, und zwar etwa bis zum Ende der Schlaufe des unteren Siebes 1. In diesem Endbereich ist er von einer weiteren Stütze 34 abgestützt.The design of the chair is particularly important. The frame comprises a frame which is essentially in the shape of an inverted U, comprising a
Ganz wesentlich ist, daß gemäß der Erfindung die Entwässerungseinheit 6, die dem Untersieb 1 zugeordnet ist, von dem in der Zeichnung linken Ende des Balkens 33 getragen ist, und daß die Entwässerungseinheit 24, die dem oberen Sieb 2 zugeordnet ist, an Balken 32 hängt. Dies trägt besonders zur optimalen Raumausnutzung bei.It is very essential that according to the invention the dewatering unit 6, which is assigned to the
Die Blattbildung beginnt bereits am keilförmigen Einlaufspalt, d.h. dort, wo die beiden Siebe 1 und 2 zusammengeführt sind. Sie findet somit bereits auf der Formierwalze 5 statt. Für die Zwecke der hier folgenden Beschreibung sowie auch für die Patentansprüche soll jedoch unter dem Ausdruck "Blattbildungszone" im wesentlichen jener Bereich der beiden Siebe 1 und 2 verstanden sein, der sich zwischen dem Ablaufpunkt dieser beiden Siebe van der Formierwalze 5 und dem Auflaufpunkt auf den Trennsauger erstreckt.The sheet formation begins at the wedge-shaped inlet gap, ie where the two
Zum Zwecke des Einzuges der beiden Siebe 1 und 2, in die Stuhlung sind die Stützen 30, 31, 34 mit herausnehmbaren Abschnitten versehen, gegebenenfalls auch der Balken 32.For the purpose of pulling the two
Der Stoffauflauf 4 ist in bekannter Weise aufgebaut. Er umfaßt einen Verteiler 4.1, der sich quer zur Laufrichtung der Siebe erstreckt, ferner Rohrbündel-Abschnitte 4.2 und 4.3.The
Wie man sieht, erstrecken sich der Hauptteil des Stoffauflaufes, nämlich die Rohrbündel-Abschnitte 4.2 und 4.3 einerseits sowie die Blattbildungszone, jedenfalls entlang der Entwässerungsleisten 7 und der Entwässerungsleisten 25, ganz grob betrachtet entlang einer Diagonalen, die annäherend die linke, untere Ecke des U-förmigen Rahmens und die rechte obere Ecke dieses Rahmens miteinander verbindet. Dabei befindet sich der Beginn der Blattbildungszone und somit der Beginn der Entwässerungsleisten 7, 25, im wesentlichen in Flächenschwerpunkt der vom Rahmen 30, 31, 32 definierten Fläche. Eine solche Anordnung ist besonders raumsparend und zugleich optimal im Hinblick auf die Arbeitsweise der gesamten Anlage sowie optimal im Hinblick auf den Bedienungskomfort. Der Stoffauflauf 4.1 ist weitgehend geschützt gegen Verschmutzungen in Gestalt von herumspritzender Stoffsuspensionen. Dies hat folgenden Grund: Legt man eine vertikale Ebene durch die Formierwalze 5, so befindet sich der Stoffauflauf 4.1 auf der einen Seite dieser Ebene, während sich die Blattbildungszone auf der anderen Seite befindet.As can be seen, the main part of the headbox, namely the tube bundle sections 4.2 and 4.3, on the one hand, and the sheet formation zone, at least along the drainage strips 7 and the drainage strips 25, roughly viewed along a diagonal, which roughly corresponds to the lower left corner of the U -shaped frame and the upper right corner of this frame connects together. The beginning of the sheet formation zone and thus the beginning of the drainage strips 7, 25 is located essentially in the center of area of the area defined by the
Für die gewaltigen Wassermassen, die im Bereich der Blattbildungszone nach beiden Seiten der beiden Siebe aus der entstehenden Faserstoffbahn austreten, ist genügend Raum vorhanden. Der untere Balken 33 erstreckt sich nur soweit in den vom U-Rahmen definierten Raum hinein, wie dies notwendig ist zur Abstützung der unteren Entwässerungseinheit 6. Das Aufhängen der oberen Entwässerungseinheit 24 am oberen Balken 32 bewirkt, daß hierzu wiederum keine Stützen oder Balken erforderlich sind, die wertvollen Raum innerhalb des Rahmens wegnehmen. Zugleich ist hierdurch eine gute Zugänglichkeit zu den kritischen Teilen, nämlich zu den Entwässerungseinheiten 6 und 24 gegeben.There is enough space for the enormous masses of water that emerge from the resulting fibrous web in the area of the sheet formation zone on both sides of the two screens. The
Claims (5)
- Twin wire former for a papermaking machine, having two wires (1, 2), namely a bottom wire (1) and a top wire (2), which form a wedge-shaped inlet gap (3) for a stock jet that is of machine width, and form a sheet forming zone which rises at an angle with respect to the horizontal, having a forming roll (5) that is arranged in the loop of the bottom wire (1) close to the inlet gap (3), and having a wire suction roll (11) that deflects the bottom wire (1), having a breast roll (20) that is arranged in the loop of the top wire (2) and close to the inlet gap (3), having dewatering units (6, 24) such as foils (7, 25), that are arranged in both wire loops, suction units, having a framing that comprises horizontal beams (32, 33) and vertical supports (30, 31, 34), and having a flowbox (4), whose nozzle directs the stock jet towards the inlet gap (3),
characterized by the following features:(a) the sheet forming zone is - seen in side view - inclined at an angle of 30 to 50° with respect to the horizontal;(b) the framing (30, 31, 32, 33, 34) comprises - seen in side view - a frame (30, 31, 32) of the shape of an inverted U having a support arranged upstream of the flowbox (4) and one arranged downstream of the latter (30, 31) and having a top beam (32) that connects the top ends of the supports (30, 31) to each other, furthermore having a bottom beam (33) which is located inside the loop of the bottom wire (1), furthermore extends on both sides of the downstream support (31) and in so doing projects with its one end into the U-shaped frame, while the other end extends at least approximately as far as the horizontal end of the loop of the bottom wire (1);(c) at least one dewatering unit (24) of the top wire (2) is suspended on the top beam (32), and at least one dewatering unit (6) of the bottom wire (1) is supported on the bottom beam (33). - Twin wire former according to Claim 1, characterized in that the axes of forming roll (5) and breast roll (20) lie at least approximately in a horizontal plane.
- Twin wire former according to Claim 1 or 2, characterized in that the nozzle of the flowbox (4) is inclined at an angle of 0 to 20° with respect to the vertical.
- Twin wire former according to one of Claims 1 to 3, characterized in that an essential part (4.2, 4.3) of the flowbox (4) - seen in side view - extends at least approximately in the direction of the sheet forming zone.
- Twin wire former according to one of Claims 1 to 4, characterized in that the start of the sheet forming zone is located at least approximately in the area centroid of the area bounded by the U-frame (30, 31, 32).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4117597A DE4117597A1 (en) | 1991-05-29 | 1991-05-29 | DOUBLE SCREEN FOR A PAPER MACHINE |
| DE4117597 | 1991-05-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0515964A1 EP0515964A1 (en) | 1992-12-02 |
| EP0515964B1 true EP0515964B1 (en) | 1996-04-17 |
Family
ID=6432720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP92108479A Expired - Lifetime EP0515964B1 (en) | 1991-05-29 | 1992-05-20 | Twin wire former for a papermaking machine |
Country Status (10)
| Country | Link |
|---|---|
| US (2) | US5300196A (en) |
| EP (1) | EP0515964B1 (en) |
| JP (1) | JPH05148791A (en) |
| AT (1) | AT399356B (en) |
| BR (1) | BR9202101A (en) |
| CA (1) | CA2070075A1 (en) |
| DE (2) | DE4117597A1 (en) |
| FI (1) | FI921985A (en) |
| NO (1) | NO922086L (en) |
| SE (1) | SE9201580L (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI932264A (en) * | 1993-05-18 | 1994-11-19 | Valmet Paper Machinery Inc | Gap shredder in a paper machine |
| JP3244911B2 (en) * | 1994-01-28 | 2002-01-07 | 三菱重工業株式会社 | Twin wire former for paper machine |
| US5766420A (en) * | 1994-05-02 | 1998-06-16 | Smurfut Carton Y Papel De Mexico | Under felt inclined flat former to produce multilayer or monolayer sheet of paper |
| DE69531451T2 (en) * | 1994-05-02 | 2004-06-24 | Smurfit Carton Y Papel De Mexico, S.A. De C.V. | ON THE BASE OF A FELT, INCLINED, FLAT SHAPING ZONE FOR THE FORMATION OF A PAPER RAIL, FOR THE PRODUCTION OF SINGLE OR MULTIPLE PAPER |
| DE19709294A1 (en) * | 1997-03-07 | 1998-09-10 | Voith Sulzer Papiermasch Gmbh | Paper-making fourdrinier zone |
| FI104100B1 (en) | 1998-06-10 | 1999-11-15 | Valmet Corp | Integrated paper machine |
| DE10106731A1 (en) * | 2001-02-14 | 2002-08-22 | Voith Paper Patent Gmbh | Twin-wire former for the production of a fibrous web from a fibrous suspension |
| US7871493B2 (en) * | 2008-06-26 | 2011-01-18 | Kimberly-Clark Worldwide, Inc. | Environmentally-friendly tissue |
| EP2841644B1 (en) * | 2012-04-27 | 2016-11-23 | Valmet Technologies, Inc. | Forming section |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3910892A1 (en) * | 1989-04-04 | 1990-10-11 | Escher Wyss Gmbh | DOUBLE SCREEN FORMER |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3846232A (en) * | 1973-03-23 | 1974-11-05 | Valmet Oy | Twin-wire paper forming with wires wrapping around a suction web-forming breast roll and then following a curved path to a suction couch roll |
| US3582467A (en) * | 1968-06-25 | 1971-06-01 | Beloit Corp | Two wire former |
| GB1288277A (en) * | 1969-02-03 | 1972-09-06 | ||
| US3540981A (en) * | 1969-02-20 | 1970-11-17 | John S Finnila | Web formation between a pair of foraminous belts |
| FI313874A (en) * | 1974-10-25 | 1976-04-26 | Valmet Oy | |
| FI64958C (en) * | 1978-02-07 | 1984-02-10 | Valmet Oy | BANFORMARE WITH DOUBLE WIRE AND PAPER MACHINE |
| FI72761C (en) * | 1981-05-15 | 1987-07-10 | Valmet Oy | FORMNINGSPARTI MED DUBBEL VIRA I PAPPERSMASKIN. |
| AT376722B (en) * | 1983-02-09 | 1984-12-27 | Andritz Ag Maschf | DRAINAGE MACHINE FOR CELLULAR OD. DGL. FIBER MATERIAL |
| FI72360C (en) * | 1985-06-07 | 1987-05-11 | Valmet Oy | FOERFARANDE VID FORMNINGEN AV EN PAPPERSBANA FOER ATT FOERBAETTRA DESS FORMATION OCH BANFORMNINGSPARTI I PAPPERSMASKIN SAMT FORMNINGSVALS. |
| JPH01502388A (en) * | 1986-04-30 | 1989-08-17 | ベロイト・コーポレイション | web forming device |
| US4894120A (en) * | 1986-04-30 | 1990-01-16 | Beloit Corporation | Twin wire forming apparatus |
| US4790909A (en) * | 1986-12-17 | 1988-12-13 | Beloit Corporation | Two-wire paper forming apparatus |
| FI85997C (en) * | 1987-06-17 | 1992-06-25 | Valmet Paper Machinery Inc | Press section in a paper machine |
| DE3803805C1 (en) * | 1988-02-09 | 1989-04-27 | J.M. Voith Gmbh, 7920 Heidenheim, De | |
| CA1313964C (en) * | 1988-03-30 | 1993-03-02 | Merle W. North | Apparatus for forming a web |
| DE3815470A1 (en) * | 1988-05-06 | 1989-11-16 | Voith Gmbh J M | DOUBLE SCREEN SHAPER |
| FI98540C (en) * | 1989-05-08 | 1997-07-10 | Valmet Corp | Device for forming a paper or board web of fibrous material |
| DE3927597A1 (en) * | 1989-08-22 | 1991-02-28 | Voith Gmbh J M | DOUBLE SCREEN SHAPER |
| DE4026953C2 (en) * | 1990-01-26 | 1995-11-30 | Escher Wyss Gmbh | Dewatering device and method for dewatering on a twin wire former |
| DE4037017C2 (en) * | 1990-11-20 | 1994-12-08 | Escher Wyss Gmbh | Wet part of a twin wire paper machine |
| DE9106599U1 (en) * | 1991-05-29 | 1991-07-18 | J.M. Voith Gmbh, 7920 Heidenheim | Twin wire former for a paper machine |
-
1991
- 1991-05-29 DE DE4117597A patent/DE4117597A1/en not_active Withdrawn
-
1992
- 1992-04-23 JP JP4130136A patent/JPH05148791A/en active Pending
- 1992-04-30 FI FI921985A patent/FI921985A/en not_active Application Discontinuation
- 1992-05-20 DE DE59205994T patent/DE59205994D1/en not_active Expired - Fee Related
- 1992-05-20 EP EP92108479A patent/EP0515964B1/en not_active Expired - Lifetime
- 1992-05-20 SE SE9201580A patent/SE9201580L/en not_active Application Discontinuation
- 1992-05-26 NO NO92922086A patent/NO922086L/en unknown
- 1992-05-27 BR BR929202101A patent/BR9202101A/en not_active IP Right Cessation
- 1992-05-27 AT AT0110892A patent/AT399356B/en not_active IP Right Cessation
- 1992-05-28 US US07/889,677 patent/US5300196A/en not_active Expired - Fee Related
- 1992-05-29 CA CA002070075A patent/CA2070075A1/en not_active Abandoned
-
1994
- 1994-01-25 US US08/186,325 patent/US5498316A/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3910892A1 (en) * | 1989-04-04 | 1990-10-11 | Escher Wyss Gmbh | DOUBLE SCREEN FORMER |
Also Published As
| Publication number | Publication date |
|---|---|
| US5300196A (en) | 1994-04-05 |
| FI921985A (en) | 1992-11-30 |
| EP0515964A1 (en) | 1992-12-02 |
| CA2070075A1 (en) | 1992-11-30 |
| SE9201580L (en) | 1992-11-30 |
| AT399356B (en) | 1995-04-25 |
| JPH05148791A (en) | 1993-06-15 |
| DE4117597A1 (en) | 1992-12-03 |
| NO922086L (en) | 1992-11-30 |
| NO922086D0 (en) | 1992-05-26 |
| FI921985A0 (en) | 1992-04-30 |
| DE59205994D1 (en) | 1996-05-23 |
| ATA110892A (en) | 1994-09-15 |
| US5498316A (en) | 1996-03-12 |
| BR9202101A (en) | 1993-01-19 |
| SE9201580D0 (en) | 1992-05-20 |
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