DE1561673C

DE1561673C - Headbox for one-sided press cylinder of cylinder molds for paper, cardboard or cardboard machines

Info

Publication number: DE1561673C
Authority: DE
Inventors: Rudolf Dipl Ing 7410 Reutlingen Matouch
Original assignee: Maschinenfabrik Zum Bruderhaus Gmbh, 7410 Reutlingen

Description

Die Erfindung betrifft einen Stoflauflauf für einseitig beaufschlagte Siebzylinder von Rundsieb-Papier-, Karton- oder Pappenmaschinen, bei dem der Siebzylinder die eine Begrenzungsseite des StoiT-auflaufkastens bildet und dieser eine senkrechte, mit einer in Richtung der Maschinenbreite verlaufenden Öffnung versehene Zwischenwand aufweist.The invention relates to a material runner for one side loaded screen cylinder of cylinder mold paper, cardboard or cardboard machines, in which The screen cylinder is one of the limiting sides of the StoiT headbox and this forms a vertical one with one running in the direction of the machine width Has opening provided intermediate wall.

Es sind nach dem Gleichstromprinzip arbeitende Stoffaufläufe bekannt, bei denen die Zwischenwandais in der Höhe verstellbarer Stromfiihrungskörpcr ausgebildet ist. Dabei dient die Form des Stromführungskörpers der Beeinflussung der Blattbildung, wobei die Mehrzahl der Fasern in Umfangsrichtung des Siebzylinders gerichtet wird. Die Höhenverstellung dient lediglich der Regelung der dem Siebzylinder zuzuführenden Stoffmenge. Der durch die Höhenverstellung bildbare Spalt führt zu einem Überlauf.There are known headboxes working according to the direct current principle, in which the intermediate walls is designed to be adjustable in height. The shape of the current-carrying body is used here influencing the sheet formation, with the majority of the fibers in the circumferential direction of the screen cylinder is directed. The height adjustment is only used to regulate the dem Amount of substance to be fed to the screen cylinder. The gap that can be formed by the height adjustment leads to a Overflow.

Man hat einen solchen Stromführungskörper auch, schon unterteilt in einen feststehenden und einen als Klappe ausgebildeten beweglichen Teil, wobei der mittels der Klappe zwischen ihr und dem feststehenden Teil bildbare Spalt im wesentlichen radial auf den Siebzylinder gerichtet ist. Dadurch kann erreicht werden, daß auf einer unterhalb des Spaltes auf dem Siebzylinder gebildeten Faserschicht mit vorwiegend in Umfangsrichtung des Siebzylinders angeordneten Fasern sich eine Schicht bildet, von deren Fasern ein Teil in im wesentlichen radialer Richtung angeordnet ist, wodurch in geringem Grade das Gefüge des Faservlieses verfilzt wird.You also have such a current-carrying body, already subdivided into a fixed and a movable part designed as a flap, with the means of the flap between it and the fixed part formable gap is directed substantially radially on the screen cylinder. Through this it can be achieved that on a fiber layer formed below the gap on the screen cylinder with fibers arranged predominantly in the circumferential direction of the screen cylinder, a layer of the fibers of which are partly arranged in a substantially radial direction, thereby to a small extent the structure of the fiber fleece is felted.

Es sind auch bereits Verteilcrwalzen in Stoffzuführungen von teilbeaufschlagten Rundsieben bekannt. Diese Vcrtcilerwalzen sollen eine Orientierung der Fasern in Strömungsrichtung verhindern und Faseransammlungen auflösen, damit eine gleichmäßige Ablage der Fasern auf dem Sieb erfolgt, dabei jedoch die Strömung möglichst wenig beeinflussen. Sie sind daher stets als ein mit Perforationen versehener Rohrkörper ausgebildet, der an den seitliehen Wänden der Stoffzulührung drehbar gelagert ist, und zwar so, daß sein Mantel vollständig umströmt werden kann, und der mit einem Antrieb verschen ist. Die Bildung einer Faserschicht mit im wesentlichen radial gerichteten Fasern auf einer zuvor gebildeten Faserschicht mit vorwiegend in Umfangsrichtung des Siebzylinders orientierten Fasern kann wegen der erwähnten Wirkung mit einer Vertcilerwalze nicht erreicht werden.There are also already known distribution rollers in material feeds of partially loaded cylinder molds. These Vcrtcilerwalzen are intended to prevent the fibers from being oriented in the direction of flow and Dissolve accumulations of fibers so that the fibers are deposited evenly on the sieve however, influence the flow as little as possible. They are therefore always considered one with perforations formed tubular body which is rotatably mounted on the lateral walls of the material feed is, in such a way that its jacket can be completely flown around, and give away with a drive is. The formation of a fiber layer with substantially radially directed fibers on a previously formed fiber layer with predominantly oriented in the circumferential direction of the screen cylinder fibers can because of the mentioned effect with a distributor roller cannot be achieved.

Der Erfindung liegt die Aufgabe zugrunde, einen Stodauflauf der einleitend erwähnten Art so auszubilden, daß sowohl die Menge der im wesentlichen radial gerichteten Fasern als auch ihre Höhenlage innerhalb der zu erzeugenden FascrstolTschicht regelbar sind. Diese Aufgabe ist gemäß der Erfindung dadurch gelöst, daß in der Öffnung eine durchgehende, hinsichtlich ihrer Drehzahl regelbare Walze mit geschlossenem, glattem, zylindrischem Mantel derart }>ehij',ert ist, daß zwischen dem in der.Öffnung befindlichen Scheitel der Walze und einer Querkante der öffnung ein Spalt gebildet ist, und daß die Bewegung des Mantels der Walze im Spalt zum Siebzylinder hin gerichtet ist.The invention is based on the object of designing a clog of the initially mentioned type in such a way that that both the amount of the substantially radially directed fibers and their altitude adjustable within the fiber layer to be produced are. This object is achieved according to the invention in that a continuous, Regarding its speed adjustable roller with closed, smooth, cylindrical shell like this }> ehij ', it is that between the At the top of the roller and a transverse edge of the opening a gap is formed, and that the movement of the shell of the roller in the gap is directed towards the screen cylinder.

Die Walze wirkt im Spalt als eine Art Pumpe, die je nach Drehzahl im Spalt mehr oder weniger Fasern etwa radial zum Siebzylinder richtet. Die von der Walze nicht gerichteten Fasern fließen in einem von der Pumpe kaum beeinflußten Strom nach unten und legen sich im wesentlichen in Umfangsrichtung an den Siebzylinder an, wobei sie in einer Initialzone eine Filterschicht zum Zurückhalten von Feinstoif und Füllstoff bilden. Diese Schicht wandert mit dem Siebzylinder zu der Stelle, wo der Siebzylinder mit den durch die Walze im wesentlichen radial gerichteten Fasern beaufschlagt wird, die sich auf die Filterschicht auflagern. Durch Regelung der Drehzahl der Walze kann also die Aufteilung der zugeführten Fasern auf die beiden Schichten, nämlich die Filterschicht und die Schicht der verfilzten, radial gerichteten Fasern, geregelt werden. Das ist deshalb von Vorteil, weil manche Papiere eine solche Filterschicht erfordern, andere wieder nicht, und weil durch Bildung der Schicht der verfilzten, radial gerichteten Fasern die Spaltfestigkeit des Faservlieses verbessert wird.The roller acts as a kind of pump in the gap, which depending on the speed of rotation in the gap more or less fibers directed approximately radially to the screen cylinder. The fibers not directed by the roller flow in one of the flow of the pump barely influenced and are applied essentially in the circumferential direction the sieve cylinder, with a filter layer in an initial zone to hold back fine material and form filler. This layer moves with the screen cylinder to the point where the screen cylinder with is acted upon by the roller essentially radially directed fibers, which are on the Apply the filter layer. By regulating the speed of the roller, the distribution of the supplied Fibers on the two layers, namely the filter layer and the layer of matted, radial directed fibers. This is an advantage because some papers require such a filter layer, others do not, and because by forming the layer of felted, radially directed fibers, the splitting strength of the fiber fleece is improved.

Die Ausbildung des Stoffauflaufes gemäß der Erfindung bietet auch noch folgenden Vorteil: Bei einem Siebzylinder ist. es erwünscht, daß die an ihn herangeführte Faserstoffsuspension möglichst schnell entwässert wird, damit die Gleichmäßigkeit der Faserverteilung in der Suspension möglichst wenig durch die Siebzylinderbewegung herabgesetzt wird. Auf bekanntem Wege wird das dadurch erreicht, daß mindestens eine Niveaudifferenz zwischen dem Spiegel im Stoffauflaufkasten. und dem Abwasserspiegel, innerhalb des Siebzylinders geschaffen wird, deren Saugwirkung gegebenenfalls noch durch Saugorgane unterstützt wird. In diesem Falle werden aber die für die Spaltfestigkeit des Vlieses wichtigen Feinstoffe mit abgesaugt. Bei der Ausbildung des Stoffauflaufes gemäß der Erfindung wird die bei bekannten Ausführungen innerhalb des Siebzylinders stattfindende Saugwirkung im wesentlichen ersetzt durch eine außerhalb des Siebzylinders durch die Walze erzeugte Druckwirkung, wodurch einerseits eine große Niveaudifferenz nicht erforderlich ist und die Bildung einer Filterschicht stattfinden kann, ohne daß Feinstoffe herausgespült werden, und andererseits die Geschwindigkeit und damit die Leistung des Siebzylinders erhöht werden kann.The formation of the headbox according to the invention also offers the following advantage: When is a sieve cylinder. it is desirable that the pulp suspension brought to him as quickly as possible is dewatered so that the uniformity of the fiber distribution in the suspension is as little as possible is reduced by the screen cylinder movement. This is achieved in a known way in that at least one level difference between the level in the headbox. and the sewage level, is created inside the screen cylinder, whose suction effect is possibly also supported by suction organs. In this case it will be but the fine substances that are important for the splitting strength of the fleece are also removed by suction. When training the Headbox according to the invention is that in known designs within the screen cylinder taking place suction essentially replaced by one outside of the screen cylinder by the Roller generated pressure effect, whereby on the one hand a large level difference is not required and the formation of a filter layer can take place without fines being flushed out, and on the other hand the speed and thus the performance of the screen cylinder can be increased.

Es ist zwar bekannt, drehbar gelagerte Walzen vorzusehen, um Ablösungen in Strömungen an Verengungen zu vermeiden. Mit der beim erfindungsgemäßen Stoffauflauf im Spalt angeordneten Walze sind diese Walzen wegen ihrer anderen Funktion nicht vergleichbar. Außerdem tritt beim erfindungsgemäßen Stoffauflauf wegen der relativ niedrigen Strömungsgeschwindigkeiten das Problem, Ablösungen am Spalt zu vermeiden, nicht auf.It is known to provide rotatably mounted rollers in order to detach them in flows at constrictions to avoid. With the roller arranged in the gap in the headbox according to the invention these rollers are not comparable due to their different functions. In addition, occurs when the invention Headbox because of the relatively low flow velocities the problem of detachments to avoid at the gap, not on.

Schließlich ist es auch noch bekannt, hinter einem Schieber in einem Hochdruckstoffauflauf eine rotierende Walze mit glatter Oberfläche anzuordnen, um den durch den Schieber beeinflußten Teil der Strömung vom übrigen Teil abzulösen und wegzuführen, um zu verhindern, daß dieser Teil die Stoffablagerung stört. Mit der Walze dieses erfindungsgemäßen Stoffauflaufes ist also diese Walze ebenfalls nicht vergleichbar.Finally, it is also known to have one behind a slide valve in a high pressure headbox To arrange rotating roller with a smooth surface to the part affected by the slide Detach the flow from the rest of the part and lead it away in order to prevent this part from depositing the substance disturbs. This roller is also with the roller of this headbox according to the invention not comparable.

Der Spalt kann unterhalb oder oberhalb der Walze vorgesehen sein. Danach richtet sich die Drehrichtung der Walze, damit die Bewegungsrichtung des Mantels im Spalt zum Siebzylinder hin gerichtet ist. Vorzugsweise ist die Größe des Spaltes, z. B. mittels einer Klappe, einstellbar.The gap can be provided below or above the roller. The direction of rotation is based on this the roller, so that the direction of movement of the shell in the gap is directed towards the screen cylinder is. Preferably the size of the gap, e.g. B. by means of a flap, adjustable.

In der Regel wird der Stoffauflauf gemäß der Erfindung derart ausgebildet werden, daß der Spalt sichAs a rule, the headbox according to the invention will be designed in such a way that the gap is

Claims

3 43 4

located about halfway up the screen cylinder and flowed area of the pulp suspension instead. at

that the pulp box is pulled further down each given by the position of the flap 16

is so that its bottom substantially below the cross section of the gap 11 '-depends on the speed

Gap is brought up to the screen cylinder. At the roller 15 'from how many fibers in the tangential direction

In such an embodiment, there is sufficient screening away from the roller 15 onto the screen cylinder 2

cylinder surface to form a filter layer to be swept in the radial direction of the same.

Disposal. However, if a filter layer does not earth and how many fibers in the lower part of the

is necessary, the gap can get very deep on the headbox chamber 6. There can be a

sit. Layer of fibers, fines and fillers

In the drawing, a headbox according to FIG. 10 is set down from the rotating screen cylinder 2, its invention for example and shown schematically. catch yourself in the lower part of chamber 6 towards It shows ■ moved towards the roller 15. This layer in which

1 shows a cross section of a first configuration, the fibers are essentially tangential

guide form, a kind of filter layer for the fines and fillers

F i g. 2 is a plan of the first embodiment fabrics. The retention of the fines and filter shape, substances in this layer is further promoted by ■ F i g. 3 and 4 partial cross-sections of a second and that no suction is exerted on this layer a third embodiment. must become. Rather, the liquid level in the

In the trough 1 is a screen cylinder 2, consisting of. Screen cylinder 2 to. approximately at the height of the ridge 9 a cylindrical frame 3 with drawn 20 range. This can be explained by the fact that the Sieve 4, rotatably mounted in bearings 17. The sieve - otherwise through a low liquid level in the cylinder 2 forms a boundary side of a screen cylinder in the lower part of the chamber 6 ausdem Trough 1 divided headbox with the practiced suction is replaced by an outside one Chambers 5, 6, which is formed by longitudinal walls. of the screen cylinder 2 from the acting as a pump Bodenwändc 7,8 of the headbox are pulled up 25 roller 15 generated pressure. On the one in the lower part and form a layer formed parallel to the screen cylinder axis in front of the chamber 6 then meet at the end Comb 9, while a partition 10 of the course of the rotation of the screen cylinder 2 of the protrudes into the headbox at the top in such a way that between rollers 15 floated against the screen cylinder 2 see their lower edge 10 'and the comb 9 in fibers, as a result of the movement imparted to them Opening 30 extending in the direction of the machine width is directed essentially radially to the screen cylinder 11 is formed. In chamber 5 of the headbox. and one deposited on the filter layer below is the inlet for the pulp suspension. Forming a layer that ensures the splitting strength of the whole At the top, the chamber 5 has an overflow 12. Increased fleece.

The chamber 6 of the material run extends from the embodiment according to FIG. 3 differs

of the opening 11 also vertically downwards and will differ from the embodiment according to FIG. 1 and 2

limited there on one side by the screen cylinder 2. Im merely in that a gap 11Γ between the

The inlet is expediently a rotating perforated upper apex of the roller 115 and the lower edge

roller 13 arranged. The only indicated decrease 110 ′ is provided, which is effected by means of a flap 116

roller 14 is mounted in bearings 23 on the trough. can be opened or closed more or less.

In the substantially rectangular opening 11 is 40. In this case, the lower apex of the roller lies a roller 15 115 whose speed can be regulated closely to the rubber lips of the comb 109, with uninterrupted, smooth, cylindrical and the roller 115 must be the opposite rotary jacket stored in warehouses 18. You will have a direction to allow the pulp suspension through Motor 19 towards the screen cylinder 102 via a gap 111 'which is regulated by means of a hand lever 20 Gear 21 and a clutch 22 driven. 45 is thrown.

The roller 15 is arranged so that its upper In the embodiment according to FIG. 4, the apex is close to the rubber-lipped opening 211 at the bottom of the chamber 206 ver-lower edge 10 '. The lower vertex of the roller is stored. The partition wall 210 with its lower edge 210'15 is at a distance from the ridge 9 that is drawn down very far from the formation. In addition, a gap 11 'is used, the amount of fiber suspension required for the passage of the roller 215, the flap 216, the screen, in any case for the operation of the screen cylinder 202 and the formation of the gap 21Γ, as shown in FIG 1. This arrangement is functional. In this gap 11 ', a flap 16 is appropriate, if the formation of a filter layer is prescribed, which allows the gap 11' to be larger or smaller,
less to open or close. The turning 55 "..,
direction of the roller 15 is such that its circumferential rotation. ^f fatent claims:
direction in the gap 11 'against the screen cylinder 2 ge 1. Headbox for one-sided pressurized screen is directed. cylinder of cylinder mold paper, cardboard or

The functioning of the headbox is as follows: Cardboard machines, in which the screen cylinder the The bilcin entering the chamber 5 from below in the headbox 60 a delimitation side of the headrest box Pulp suspension is first through det and this one vertical, with one in Richdie Perforated roller 13 mixed so that the fibers direction of the machine width extending opening are distributed as evenly as possible. The. having smooth provided partition, thereby rotating roller 15 acts as a kind of pump and is characterized in that in the opening (11) promotes the suspension, as far as it does not have a continuous, with regard to its speed .Overflow 12. is returned, through the gap 1Γ adjustable roller (15) with closed, smooth, through into the chamber 6. There is an Er-cylindrical jacket is mounted in such a way that increase in the consistency of the material in that of roller 15 between that in opening (11)

A gap (II ⁷ ) is formed at the apex of the roller (15) and a transverse edge of the opening (11), and that the movement of the shell of the roller (15) in the gap (H ') is directed towards the screen cylinder (2). '2. Headbox according to claim 1, characterized in that the size of the gap (11') » z. B. by means of a flap, is adjustable .

1 sheet of drawings