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EP0438685A1 - Former in a paper machine - Google Patents

Former in a paper machine Download PDF

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Publication number
EP0438685A1
EP0438685A1 EP90123544A EP90123544A EP0438685A1 EP 0438685 A1 EP0438685 A1 EP 0438685A1 EP 90123544 A EP90123544 A EP 90123544A EP 90123544 A EP90123544 A EP 90123544A EP 0438685 A1 EP0438685 A1 EP 0438685A1
Authority
EP
European Patent Office
Prior art keywords
strips
sieve
shaper according
wire
shaper
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90123544A
Other languages
German (de)
French (fr)
Other versions
EP0438685B1 (en
Inventor
Alfred Dr. Bubik
Hans Dr. Dahl
Otto Hildebrand
Karl Müller
Jörg Walter
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sulzer Escher Wyss GmbH
Original Assignee
Sulzer Escher Wyss GmbH
Escher Wyss GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
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Application filed by Sulzer Escher Wyss GmbH, Escher Wyss GmbH filed Critical Sulzer Escher Wyss GmbH
Priority to AT90123544T priority Critical patent/ATE101217T1/en
Publication of EP0438685A1 publication Critical patent/EP0438685A1/en
Application granted granted Critical
Publication of EP0438685B1 publication Critical patent/EP0438685B1/en
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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 former for a paper machine of the type described in the preamble of claim 1 and its advantageous use.
  • Formers of this type can be operated both in the immediate vicinity of a headbox, the suspension being injected in a flat jet into the space formed by the convergence of the sieves and then dewatered between the sieves, but they can also be provided with a pre-dewatering section in which Care is taken to ensure that the suspension coming from the headbox is guided over a certain distance on a sieve, with some of the water contained being able to be removed from the suspension, in particular downwards, even before it enters the former.
  • the pre-dewatering section is then followed by the former of the type described here, the pre-dewatered suspension generally remaining on the sieve and the former being formed as a so-called twin-wire former while adding another sieve.
  • a ledge is inserted from the opposite side against the opposite drainage slot, most effectively at each slot and with considerable pressure, so that the liquid is pressed out of the web can.
  • this pressure can be so high that the web to be formed is crushed between the sieves. If the pressure is absent or too low, the web can be re-moistened from above by the previously squeezed out liquid and thereby adversely changed. With the high pressures to be used, the screens also suffer and are worn out earlier. Because of the narrow spacing between the strips, the spaces between the strips become dirty due to fibers and ash being pushed out too much.
  • the lower strips are mounted on a flexible plate. There, however, the water drained downwards has to be discharged laterally between the strips, so that the amount is limited and there is a risk of contamination. No individual contact pressure of the strips can be set, and the reproducibility of the setting is insufficient.
  • the strips on the lower sieve increase: sieve wear; the diarrhea, i.e. too many fines and ashes are washed out of the web; the formation impulses which are obtained on the lasts are inevitably too high in the previous devices, and often they lead to a formation deterioration in the case of substances sensitive to shear force.
  • the aim is to enable the dewatering and the formation of the blade to be adapted to the various technological conditions that arise on the way through the formation section, primarily the changing position of the water line of the web between the screens by appropriately positioning the strips relative to the web , ie to act on them only as gently as possible according to actual local needs, so that the sheet to be formed is not is damaged.
  • the wear on the screens is also to be reduced and the water drainage is to be improved.
  • the positioning to be carried out as required should also be possible during the operation of the paper machine.
  • the drainage and formation are carried out in a gentle manner according to the local technological conditions of the railway and according to the actual local need.
  • a paper sheet is formed in the former between an upper wire 1 and a lower wire 2.
  • the suspension which is located between sieves 1 and 2
  • the suspension is dewatered, the sheet being formed. This should maintain a homogeneous structure.
  • Dewatering and formation are carried out using strips 3 and 4, one with reference numbers 3 above the upper sieve 1 and the other 4 below the lower sieve 2 are provided.
  • the strips 3 and 4 are arranged along the formation line, run transversely to the machine direction and are adjustable relative to the screens 1 and 2, so that during operation they touch the screens facing them, which run past them supported.
  • the strips 3 which have to touch the top sieve 1
  • various known expedient forms that can be used.
  • the sides of the strips 3 facing the sieve produce a conforming surface which forms the spatial shape of the formation section. It forms e.g. a rust-shaped bottom surface of a housing 12 facing the upper sieve 1 for collecting and discharging the liquid flowing through the gaps 5 'during operation.
  • the spatial shape of the formation section can be formed by a straight line, as is the case according to FIG. 1. However, the shape can also be formed by a concave or convex curve, which are shown in FIG. 2 or FIG. 3, or an approximately wavy or arbitrary curve.
  • the strips 3 are arranged along the surface at intervals 5, whereby the columns 5 'are formed.
  • the strips 4, which have to be coated on the lower wire 2 are each designed in a suitable form. They can have smaller differences from one another, for example in the design of their head part facing the lower sieve 2. It is an advantage of the subject matter of the invention that, viewed transversely to the direction of travel, larger tolerances are permissible without disadvantage for the dimensional accuracy of the head part facing the lower sieve because of the relatively large distance between these strips resulting from the characteristics.
  • the Possibilities To Favorably Form The Sheet Formation Process influence can also be improved by deliberately created inequalities across the width. It is also conceivable to correct the shape of the head part over the width, in particular during operation, for example by deforming it in zones.
  • the strips 4 are arranged on a table 7 that can be positioned relative to the lower wire 2 along the formation path at regular or irregular intervals 6.
  • the individual distance 6 is in each case greater than the sum of the width of an individual bar 3 located in the top wire and the distance 5 to the adjacent bar located in the top wire, in the machine running direction.
  • the invention is based on a formation section with a length of 500 to 3000 mm. In this case strips 3 or 4 with a width of between 10 and 60 mm would be used.
  • zones e.g. 1 to 10 in number.
  • inserts 8 which match the same intervals 5, whereby a longitudinal section of the surface is in each case without suction.
  • This can be designed such that these inserts 8, which delimit the individual zones, could also be inserted into the relevant distances 5 from the side, if required, during operation.
  • the individual drainage gaps 5 ' can also advantageously be acted upon with different vacuum.
  • the partitions 11 shown schematically here in the housing 12 are required and an extraction system which can be set to several negative pressures.
  • the strips 4 to be touched on the lower wire 2 are mounted on the table 7, which can advantageously be raised, inclined and longitudinally displaceable to the lower wire during operation, so as to be positionable in the machine running direction. Ie they are not permanently connected to the table 7 at one point. For example, on the surface of the table there are several grooves running transversely to the machine direction, into which grooves with dovetail connection strips 4 can be pushed in and out. In this way, the strips 4 can also be moved to another location during operation by pulling them out of a previous position from the side of the machine and pushing them into a new desired position, that is to say into a different groove.
  • the strips 4 to be touched on the lower wire 2 are individually adjustable, supported on the table, in the direction of the lower wire 2.
  • the height of each can be adjusted individually. It is particularly advantageous if the strips 4 can be adjusted pneumatically or hydraulically. During operation, they can be supported elastically and resiliently against the table 7 on an air cushion 9, for example by have two telescopically nested parts, between which an inflatable air bellows is arranged.
  • the zone formation along the fitting surface with the strips 3, the positioning of the strips 4 on the table 7, the individual adjustment of the strips 4 and the positioning of the table 7 enable the papermaker, the drainage and the formation of the sheet between the screens according to the technological requirements and the situation in a large operating area. All of the problems mentioned in the beginning the process can be overcome. It is possible to make the process gentle, as far as the paper sheet to be formed and the surrounding sieves are concerned.
  • the pneumatic elastic support of the strips 4 and the table 7 also contributes to this, which is able to elastically compensate for a sudden local increase in the thickness of the suspension path between the sieves without damaging the sheet or sieves.

Landscapes

  • Paper (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Basic Packing Technique (AREA)
  • Soil Working Implements (AREA)
  • Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)

Abstract

To regulate the dewatering and formation of the paper sheet between the screens (1 and 2), along the upper screen (1) there are fences (3) which are especially of uniform design. An identical spacing (5) is left free respectively between them. The spacing (5) is no smaller than the width of the fence (3). The individual spacings (5) can be closed by means of push-in inserts (8), with the result that the dewatering can be forced to take place in zones separate from one another. Arranged along the lower screen (2) on a table (7) are fences (4), between which can be set different spacings (6) which, in an advantageous embodiment, are each larger than the width of the individual counterfence (3) plus its distance from the adjacent fence. The fences (6) can be shiftable longitudinally on the table (7) and adjustable individually in the direction of the lower screen (2). In one version, the table (7) can be positioned both vertically and horizontally in relation to the lower screen (2). All these measures can also be carried out while the paper machine is in operation. The individual fences (4) are supported elastically against the table (7) and the table (7) is supported elastically against its foundation. It is possible, while the paper machine is running, to make the process operate, in view of technological requirements and the local situation and time factor, with a high degree of care of the paper sheet to be formed and of the apparatus to be operated. <IMAGE>

Description

Die Erfindung bezieht sich auf einen Former für eine Papiermaschine der in dem Oberbegriff des Patentanspruchs 1 beschriebenen Art sowie seine vorteilhafte Verwendung.The invention relates to a former for a paper machine of the type described in the preamble of claim 1 and its advantageous use.

Former dieser Art können sowohl in unmittelbarer Nähe eines Stoffauflaufes betrieben werden, wobei die Suspension in einem Flachstrahl in den durch das Zusammenlaufen der Siebe gebildeten Zwischenraum eingespritzt und anschließend zwischen den Sieben entwässert wird, sie können aber auch mit einer Vorentwässerungsstrecke versehen sein, in der dafür Sorge getragen wird, daß die aus dem Stoffauflauf kommende Suspension auf einem Sieb über eine bestimmte Strecke geführt wird, wobei bereits vor Eintritt in den Former ein Teil des enthaltenen Wassers aus der Suspension - insbesondere nach unten - herausgeführt werden kann. Der Vorentwässerungsstrecke folgt dann der Former der hier beschriebenen Art, wobei in der Regel die vorentwässerte Suspension auf dem Sieb verbleibt und unter Hinzuführen eines weiteren Siebes der Former als sog. Doppelsiebformer gebildet wird.Formers of this type can be operated both in the immediate vicinity of a headbox, the suspension being injected in a flat jet into the space formed by the convergence of the sieves and then dewatered between the sieves, but they can also be provided with a pre-dewatering section in which Care is taken to ensure that the suspension coming from the headbox is guided over a certain distance on a sieve, with some of the water contained being able to be removed from the suspension, in particular downwards, even before it enters the former. The pre-dewatering section is then followed by the former of the type described here, the pre-dewatered suspension generally remaining on the sieve and the former being formed as a so-called twin-wire former while adding another sieve.

Bei bisherigen Formen solcher Art, wie z.B. aus der US-PS 4,769,111, der DE-PS 31 38 133, der DE-PS 31 53 305, der DE-PS 35 46 629 und der EP-OS 0 251 778 bekannt, sind eine Vielzahl von Leisten, mit welchen eine Verbesserung der Formation erzielt werden soll, über die gesamte Länge der Formationsstrecke, jeweils regelmäßig verteilt angeordnet. Es kann vorkommen, daß solche Verteilung der Leisten zu Beschädigung des gebildeten Papierblattes führen kann, besonders an den Stellen der Formationsstrecke, die sich hinter der sogenannten Wasserlinie befinden.With previous forms of this type, e.g. from US-PS 4,769,111, DE-PS 31 38 133, DE-PS 31 53 305, DE-PS 35 46 629 and EP-OS 0 251 778 a variety of strips are known with which an improvement the formation is to be achieved, regularly distributed over the entire length of the formation section. It can happen that such distribution of the strips can lead to damage to the paper sheet formed, especially at the points of the formation section which are located behind the so-called water line.

Bei anderen wird von der Gegenseite eine Leiste jeweils gegen den gegenüberliegenden Entwässerungsschlitz eingesetzt, und zwar am wirksamsten an jedem Schlitz und mit einem beachtlichen Druck, damit die Flüssigkeit aus der Bahn herausgedrückt werden kann. Dieser Druck kann unter Umständen so hoch sein, daß die zu formierende Bahn zwischen den Sieben zerquetscht wird. Bei fehlendem oder zu geringem Druck kann die Bahn von oben durch die vorher ausgedrückte Flüssigkeit erneut befeuchtet und dadurch nachteilig verändert werden. Bei den hohen anzuwendenden Drücken leiden auch die Siebe und werden früher verschlissen. Wegen des engen Leistenabstandes verschmutzen die Leistenzwischenräume durch z.B. zuviel herausgedrückte Fasern und Asche.In others, a ledge is inserted from the opposite side against the opposite drainage slot, most effectively at each slot and with considerable pressure, so that the liquid is pressed out of the web can. Under certain circumstances, this pressure can be so high that the web to be formed is crushed between the sieves. If the pressure is absent or too low, the web can be re-moistened from above by the previously squeezed out liquid and thereby adversely changed. With the high pressures to be used, the screens also suffer and are worn out earlier. Because of the narrow spacing between the strips, the spaces between the strips become dirty due to fibers and ash being pushed out too much.

Bei der aus DE-PS 35 46 629 bekannten Ausführung sind die unteren Leisten auf einer flexiblen Platte montiert. Dort muß aber das nach unten abgeführte Wasser seitlich zwischen den Leisten ausgeleitet werden, damit ist die Menge beschränkt, und es besteht Verschmutzungsgefahr. Auch ist keine individuelle Anpreßkraft der Leisten einstellbar, und die Reproduzierbarkeit der Einstellung ist ungenügend.In the embodiment known from DE-PS 35 46 629, the lower strips are mounted on a flexible plate. There, however, the water drained downwards has to be discharged laterally between the strips, so that the amount is limited and there is a risk of contamination. No individual contact pressure of the strips can be set, and the reproducibility of the setting is insufficient.

Wenn, wie etwa gemäß EP-OS 0 251 778, eine Vielzahl von Leisten am Untersieb auf einem starren Rahmen montiert ist, ist die Gefahr von Verdrückungen, Siebbeschädigung etc. besonders hoch. Dort ist auch die Wasserableitung eingeschränkt bei gleichzeitig großer Verschmutzungsgefahr.If, as in accordance with EP-OS 0 251 778, a large number of strips are mounted on the lower sieve on a rigid frame, the risk of deformations, sieve damage etc. is particularly high. There, water drainage is also restricted with a high risk of contamination.

Bei den bisherigen Anordnungen erhöhen die Leisten am Untersieb: Den Siebverschleiß; den Siebdurchfall, d.h. zuviele Feinstoffe und Asche werden aus der Bahn gewaschen; die Formationsimpulse, die an den Leisten erwirkt werden, sind bei den bisherigen Vorrichtungen zwangsläufig zu hoch, und oft führen sie dadurch bei scherkraftempfindlichen Stoffen zu einer Formationsverschlechterung.In the previous arrangements, the strips on the lower sieve increase: sieve wear; the diarrhea, i.e. too many fines and ashes are washed out of the web; the formation impulses which are obtained on the lasts are inevitably too high in the previous devices, and often they lead to a formation deterioration in the case of substances sensitive to shear force.

Die oben erwähnten Nachteile der bisherigen Vorrichtungen sollen mit der Erfindung vermieden werden. Es soll ermöglicht werden, die Entwässerung und die Formation des Blattes den verschiedenen technologischen Verhältnissen, wie sie sich auf dem Weg durch die Formationsstrecke ergeben, hauptsächlich die sich ändernde Lage der Wasserlinie der Bahn zwischen den Sieben durch entsprechende Positionierung der Leisten relativ zu der Bahn anzupassen, d.h. auf sie nur nach tatsächlichem örtlichen Bedarf möglichst schonend einzuwirken, so daß das zu formierende Blatt nicht beschädigt wird. Dabei soll auch der Verschleiß der Siebe verringert und die Wasserableitung verbessert werden. Die nach Bedarf vorzunehmende Positionierung soll auch während des Betriebs der Papiermaschine möglich sein.The above-mentioned disadvantages of the previous devices are to be avoided with the invention. The aim is to enable the dewatering and the formation of the blade to be adapted to the various technological conditions that arise on the way through the formation section, primarily the changing position of the water line of the web between the screens by appropriately positioning the strips relative to the web , ie to act on them only as gently as possible according to actual local needs, so that the sheet to be formed is not is damaged. The wear on the screens is also to be reduced and the water drainage is to be improved. The positioning to be carried out as required should also be possible during the operation of the paper machine.

Diese Aufgabe ist erfindungsgemäß an dem Former der anfangs beschriebenen Art durch Maßnahmen, die in dem Patentanspruch 1 angegeben sind, erfüllt.This object is achieved on the former of the type described at the outset by means of the measures specified in claim 1.

Die Entwässerung und die Formation wird auf schonende Weise entsprechend den örtlichen technologischen Verhältnissen der Bahn und entsprechend der tatsächlichen örtlichen Notwendigkeit vorgenommen.The drainage and formation are carried out in a gentle manner according to the local technological conditions of the railway and according to the actual local need.

In den Unteransprüchen werden vorteilhafte Ausführungsbeispiele des erfindungsgemäßen Formers angegeben.Advantageous exemplary embodiments of the former according to the invention are specified in the subclaims.

Im weiteren werden der Erfindungsgegenstand und seine Vorteile näher beschrieben und erklärt. Die Beschreibung bezieht sich auf eine Zeichnung, in der zeigt:

Fig. 1
schematisch einen Teil des Formers von der Seite gesehen;
Fig. 2
eine Kurve, entlang welcher eine Formstrecke gestaltet werden kann, und
Fig. 3
eine andere solche Kurve.
Fig. 4
schematisch eine spezielle Anordnung der Leisten;
The subject matter of the invention and its advantages are described and explained in more detail below. The description refers to a drawing in which:
Fig. 1
schematically a part of the former seen from the side;
Fig. 2
a curve along which a molding path can be designed, and
Fig. 3
another such curve.
Fig. 4
schematically a special arrangement of the strips;

Schematisch ist der erfindungsbezogene Teil eines Formers für eine Papiermaschine dargestellt. In zweckmäßig angepaßter Form ist solcher auch für eine Kartonmaschine anwendbar. In dem Former wird zwischen einem Obersieb 1 und einem Untersieb 2 ein Papierblatt, gegebenenfalls ein Kartonblatt, gebildet. Beim Betrieb wird die Suspension, die sich zwischen den Sieben 1 und 2 befindet, entwässert, wobei das Blatt gebildet wird. Dieses soll eine homogene Struktur erhalten. Das Entwässern und die Formation geschieht unter Einsatz von Leisten 3 und 4, welche eine mit Bezugszeichen 3 oberhalb des Obersiebs 1 und die andere 4 unterhalb des Untersiebs 2 jeweils zum Einsatz vorgesehen sind. Die Leisten 3 und 4 sind entlang der Formationsstrecke angeordnet, verlaufen quer zur Maschinenlaufrichtung und sind relativ zu den Sieben 1 bzw. 2 einstellbar, so daß sie beim Betrieb die ihnen jeweils zugewandten Siebe, die an ihnen gestützt vorbeilaufen, berühren. Ein Teil der denkbaren Einstellbewegungen ist durch dicke Doppelpfeile angedeutet. Zwischen den Leisten 3 und 4 sind Abstände 5 bzw. 6 vorgesehen, so daß quer zur Laufrichtung Schlitze freigelassen sind, durch welche jeweils der Abfluß der der Suspension zwischen den Sieben 1 und 2 wegzunehmenden Flüssigkeit stattfindet. Dies geschieht beiderseits, vom Obersieb 1 wie vom Untersieb 2 weg. Fig.1 und Fig.4 zeigen dabei zwei Beispiele der Leistenanordnung relativ zueinander.The part of a former for a paper machine relating to the invention is shown schematically. In a suitably adapted form, it can also be used for a board machine. A paper sheet, possibly a cardboard sheet, is formed in the former between an upper wire 1 and a lower wire 2. During operation, the suspension, which is located between sieves 1 and 2, is dewatered, the sheet being formed. This should maintain a homogeneous structure. Dewatering and formation are carried out using strips 3 and 4, one with reference numbers 3 above the upper sieve 1 and the other 4 below the lower sieve 2 are provided. The strips 3 and 4 are arranged along the formation line, run transversely to the machine direction and are adjustable relative to the screens 1 and 2, so that during operation they touch the screens facing them, which run past them supported. Some of the conceivable adjustment movements are indicated by thick double arrows. Spaces 5 and 6 are provided between the strips 3 and 4, so that slots are left open transversely to the direction of travel, through which the drainage of the suspension between the sieves 1 and 2 takes place. This happens on both sides, away from the top wire 1 and from the bottom wire 2. 1 and 4 show two examples of the strip arrangement relative to one another.

Für die Leisten 3, die das Obersieb 1 zu berühren haben, gibt es verschiedene bekannte zweckmäßige Formen, die benutzt werden können. Die dem Sieb zugewandten Seiten der Leisten 3 erzeugen eine Schmiegfläche, die die räumliche Form der Formationsstrecke bildet. Sie bildet z.B. eine dem Obersieb 1 zugewandte rostförmige Bodenfläche eines Gehäuses 12 zum Sammeln und Abführen der durch die Spalten 5' beim Betrieb abfließenden Flüssigkeit. Die räumliche Form der Formationsstrecke kann durch eine gerade Linie gebildet sein, wie es gemäß Fig. 1 der Fall ist. Die Form kann aber auch durch eine konkave oder konvexe Kurve gebildet sein, welche in Fig. 2 bzw. Fig. 3 gezeigt sind, oder ein etwa wellenförmiger oder auch beliebiger Kurvenzug.For the strips 3, which have to touch the top sieve 1, there are various known expedient forms that can be used. The sides of the strips 3 facing the sieve produce a conforming surface which forms the spatial shape of the formation section. It forms e.g. a rust-shaped bottom surface of a housing 12 facing the upper sieve 1 for collecting and discharging the liquid flowing through the gaps 5 'during operation. The spatial shape of the formation section can be formed by a straight line, as is the case according to FIG. 1. However, the shape can also be formed by a concave or convex curve, which are shown in FIG. 2 or FIG. 3, or an approximately wavy or arbitrary curve.

Die Leisten 3 sind entlang der Fläche in Abständen 5 angeordnet, wodurch die Spalten 5' gebildet werden.The strips 3 are arranged along the surface at intervals 5, whereby the columns 5 'are formed.

Die Leisten 4, die das Untersieb 2 zu bestreichen haben, sind jeweils in einer zweckmäßigen Form ausgeführt. Sie können untereinander kleinere Unterschiede, z.B. in Ausführung ihres dem Untersieb 2 zugewandten Kopfteiles, aufweisen. Es ist ein Vorteil des Erfindungsgegenstandes, daß auch quer zur Laufrichtung gesehen, wegen des sich aus den Kennzeichen ergebendem relativ großen Abstandes zwischen diesen Leisten für die Maßgenauigkeit des dem Untersieb zugewandten Kopfteiles größere Toleranzen ohne Nachteil zulässig sind. Die Möglichkeiten, den Blattbildungsvorgang günstig zu beeinflussen, können auch zusätzlich durch bewußt erzeugte Ungleichheiten über die Breite verbessert werden. Auch eine über die Breite vorzunehmende Korrektur der Form des Kopfteiles, insbesondere während des Betriebes, etwa durch zonenweise regelbares Verformen, ist denkbar.The strips 4, which have to be coated on the lower wire 2, are each designed in a suitable form. They can have smaller differences from one another, for example in the design of their head part facing the lower sieve 2. It is an advantage of the subject matter of the invention that, viewed transversely to the direction of travel, larger tolerances are permissible without disadvantage for the dimensional accuracy of the head part facing the lower sieve because of the relatively large distance between these strips resulting from the characteristics. The Possibilities To Favorably Form The Sheet Formation Process influence, can also be improved by deliberately created inequalities across the width. It is also conceivable to correct the shape of the head part over the width, in particular during operation, for example by deforming it in zones.

Die Leisten 4 sind auf einem relativ zum Untersieb 2 positionierbaren Tisch 7 entlang der Formationsstrecke in regelmäßigen oder unregelmäßigen Abständen 6 angeordnet. Der einzelne Abstand 6 ist in einer besonders vorteilhaften Ausführungsform jeweils größer als die Summe aus der Breite einer einzelnen im Obersieb gegenüberliegenden Leiste 3 und dem Abstand 5 zur benachbarten, im Obersieb befindlichen Leiste, in Maschinenlaufrichtung gesehen.The strips 4 are arranged on a table 7 that can be positioned relative to the lower wire 2 along the formation path at regular or irregular intervals 6. In a particularly advantageous embodiment, the individual distance 6 is in each case greater than the sum of the width of an individual bar 3 located in the top wire and the distance 5 to the adjacent bar located in the top wire, in the machine running direction.

Die Erfindung orientiert sich an einer Formationsstrecke in der Länge von 500 bis 3000 mm. Dabei kämen zum Einsatz Leisten 3 bzw. 4 von einer Breite zwischen 10 bis 60 mm. Ein Vorteil wird darin gesehen, daß in der Formationsfläche mit den Leisten 3 je nach technologischen Anforderungen Zonen, z.B. 1 bis 10 an der Zahl, gebildet werden. Man kann auchjeweils einige in Maschinenlaufrichtung aufeinanderfolgende Abflußschlitze mit Abständen 5 mit in die jeweils gleichen Abstände 5 passenden Einlagen 8 verschließen, womit jeweils ein Längsabschnitt der Fläche ohne Saugwirkung ist. Dies kann konstruktiv so ausgeführt sein, daß diese Einlagen 8, die die einzelnen Zonen begrenzen, nach Bedarf auch beim Betrieb von der Seite her in die betreffenden Abstände 5 einschiebbar wären. Die einzelnen Entwässerungsspalte 5' können auch vorteilhaft mit unterschiedlichem Vakuum beaufschlagt werden. Dazu würden z.B. die hier schematisch eingezeichneten Trennwände 11 im Gehäuse 12 benötigt und eine auf mehrere Unterdrücke einstellbare Absauganlage.The invention is based on a formation section with a length of 500 to 3000 mm. In this case strips 3 or 4 with a width of between 10 and 60 mm would be used. An advantage is seen in the fact that in the formation area with the strips 3, depending on the technological requirements, zones, e.g. 1 to 10 in number. It is also possible to close off several successive drainage slots in the machine direction at intervals 5 with inserts 8 which match the same intervals 5, whereby a longitudinal section of the surface is in each case without suction. This can be designed such that these inserts 8, which delimit the individual zones, could also be inserted into the relevant distances 5 from the side, if required, during operation. The individual drainage gaps 5 'can also advantageously be acted upon with different vacuum. For this, e.g. the partitions 11 shown schematically here in the housing 12 are required and an extraction system which can be set to several negative pressures.

Die das Untersieb 2 zu berührenden Leisten 4 sind an dem Tisch 7, der vorteilhaft zu dem Untersieb auch während des Betriebes anhebbar, neigbar und längsverschiebbar sein kann, in der Maschinenlaufrichtung positionierbar montiert. D.h. sie sind nicht an einer Stelle fest mit dem Tisch 7 verbunden. Z.B. sind auf der Oberfläche des Tisches mehrere quer zur Maschinenlaufrichtung verlaufende Nuten vorgesehen, in welche die mit Schwalbenschwanz-Verbindung ausgeführten Leisten 4 ein- und ausschiebbar sind. Auf diese Weise können die Leisten 4 nach Bedarf auf eine andere Stelle auch im Betrieb versetzt werden, indem sie von der Seite der Maschine her aus einer vorherigen Position herausgezogen und in eine neue gewünschte Position, also in eine andere Nut eingeschoben werden.The strips 4 to be touched on the lower wire 2 are mounted on the table 7, which can advantageously be raised, inclined and longitudinally displaceable to the lower wire during operation, so as to be positionable in the machine running direction. Ie they are not permanently connected to the table 7 at one point. For example, on the surface of the table there are several grooves running transversely to the machine direction, into which grooves with dovetail connection strips 4 can be pushed in and out. In this way, the strips 4 can also be moved to another location during operation by pulling them out of a previous position from the side of the machine and pushing them into a new desired position, that is to say into a different groove.

Die das Untersieb 2 zu berührenden Leisten 4 sind, auf dem Tisch gestützt, in Richtung zu dem Untersieb 2 individuell verstellbar. Jede für sich kann in der Höhe verstellt werden. Besonders vorteilhaft ist es, wenn die Leisten 4 pneumatisch oder hydraulisch verstellbar sind. Sie können beim Betrieb an je einem Luftpolster 9 gegen den Tisch 7 elastisch nachgiebig abgestützt sein, indem sie z.B. zwei ineinander teleskopisch geschachtelte Teile aufweisen, zwischen welchen ein aufblasbarer Luftbalg angeordnet ist.The strips 4 to be touched on the lower wire 2 are individually adjustable, supported on the table, in the direction of the lower wire 2. The height of each can be adjusted individually. It is particularly advantageous if the strips 4 can be adjusted pneumatically or hydraulically. During operation, they can be supported elastically and resiliently against the table 7 on an air cushion 9, for example by have two telescopically nested parts, between which an inflatable air bellows is arranged.

Eine vorteilhafte Möglichkeit, die Vorrichtung den papiertechnologischen Anforderungen anzupassen, ergibt sich aus der Verstellmöglichkeit des Tisches 7 in bzw. gegen Sieblaufrichtung. Dadurch läßt sich die Stellung der Leisten 4 relativ zu den Leisten 3 verändern, was zu positiven Auswirkungen bei der Blattbildung führt. Es ist je nach Anwendung denkbar, daß in Sieblaufrichtung die erste und/oder die letzte Leiste der Formationsstrecke eine auf das Untersieb 2 wirkende Leiste 4 ist.An advantageous possibility of adapting the device to the requirements of paper technology results from the possibility of adjusting the table 7 in or against the direction of wire travel. As a result, the position of the strips 4 can be changed relative to the strips 3, which leads to positive effects in sheet formation. Depending on the application, it is conceivable that the first and / or the last bar of the formation section in the direction of wire travel is a bar 4 acting on the lower wire 2.

Von weiterem Vorteil ist es, wenn der Tisch 7 mit den versetzbaren und flexibel abgestützten Leisten 4 zur Positionierung vertikal zum Untersieb 2 gegen sein Fundament an Luftbälgen abgestützt ist und so pneumatisch elastisch gelagert ist.It is a further advantage if the table 7 with the displaceable and flexibly supported strips 4 for positioning vertically to the lower sieve 2 is supported against its foundation on air bellows and is thus supported in a pneumatically elastic manner.

Die beschriebenen, auch beim Betrieb vornehmbaren Maßnahmen: Die Zonenbildung entlang der Schmiegfläche mit den Leisten 3, die Positionierung der Leisten 4 auf dem Tisch 7, das individuelle Verstellen der Leisten 4 und die Positionierung des Tisches 7 ermöglichen dem Papiermacher, die Entwässerung und die Formation des Blattes zwischen den Sieben entsprechend den technologischen Anforderungen und der Situation in einem großen Operationsbereich zu führen. Alle die anfangs erwähnten Probleme bei dem Vorgang können überwunden werden. Es wird ermöglicht, den Vorgang schonend zu gestalten, was das zu bildende Papierblatt wie auch die umlaufenden Siebe betrifft. Dazu trägt auch die pneumatisch elastische Abstützung der Leisten 4 und des Tisches 7 bei, die einen plötzlich örtlich vorgekommenen Anstieg der Dicke der Suspensionsbahn zwischen den Sieben ohne Beschädigung des Blattes, bzw. der Siebe elastisch auszugleichen vermag.The measures described, which can also be carried out during operation: the zone formation along the fitting surface with the strips 3, the positioning of the strips 4 on the table 7, the individual adjustment of the strips 4 and the positioning of the table 7 enable the papermaker, the drainage and the formation of the sheet between the screens according to the technological requirements and the situation in a large operating area. All of the problems mentioned in the beginning the process can be overcome. It is possible to make the process gentle, as far as the paper sheet to be formed and the surrounding sieves are concerned. The pneumatic elastic support of the strips 4 and the table 7 also contributes to this, which is able to elastically compensate for a sudden local increase in the thickness of the suspension path between the sieves without damaging the sheet or sieves.

Claims (26)

Former für eine Papiermaschine zum Bilden des Papierblattes zwischen einem Obersieb (1) und einem Untersieb (2) beim Entwässern der Suspension zwischen den Sieben unter Einsatz von beiderseits der Siebe, oben wie unten entlang der Linie der Formationsstrecke angeordneten, quer zur Maschinenlaufrichtung verlaufenden, relativ zu den Sieben einstellbaren und die Siebe im Betrieb berührenden Leisten (3 und 4), wobei zwischen den Leisten Abstände (5 und 6) vorgesehen werden, wodurch Spalten (5'und 6') zum Abfluß der bei dem Entwässern wegzubringenden Flüssigkeit freigelassen sind, dadurch gekennzeichnet, daß die Breiten und die Positionen der die Siebe im Betrieb berührenden Leisten (3 und 4) sowie die Abstände (5 und 6) zwischen den Leisten so aufeinander abgestimmt sind, daß wenigstens jeder zweite Spalt (5') zwischen den im Obersieb befindlichen Leisten (3) nicht von einer im Untersieb befindlichen Leiste (4) ganz oder teilweise überdeckt wird.Shaper for a paper machine for forming the paper sheet between an upper sieve (1) and a lower sieve (2) when dewatering the suspension between the sieves using both sides of the sieves, arranged above and below along the line of the formation line, transverse to the machine direction, relatively to the sieves (3 and 4), which are adjustable and touch the sieves during operation, spacing (5 and 6) being provided between the strips, thereby leaving gaps (5 'and 6') for the drainage of the liquid to be removed during dewatering, characterized in that the widths and the positions of the strips (3 and 4) touching the screens during operation and the distances (5 and 6) between the strips are matched to one another such that at least every second gap (5 ') between those in the top screen located strips (3) is not completely or partially covered by a strip (4) located in the lower sieve. Former nach Anspruch 1, dadurch gekennzeichnet, daß die Leisten (3), die das Obersieb (1) zu berühren haben, alle in einer gleichen Form ausgeführt und zur Bildung einer Schmiegfläche zusammengefügt sind, entlang der sie in regelmäßigen Abständen (5) angeordnet sind.Shaper according to claim 1, characterized in that the strips (3) which have to touch the top sieve (1) are all designed in the same shape and are joined to form a conforming surface along which they are arranged at regular intervals (5) . Former nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß die Leisten (4), die das Untersieb (2) zu berühren haben, auf einem Tisch (7) entlang der Formationsstrecke in Abständen (6) zueinander montierbar sind.Shaper according to claim 1 or 2, characterized in that the strips (4) which have to touch the bottom wire (2) can be mounted on a table (7) along the formation line at intervals (6) to one another. Former nach Anspruch 3, dadurch gekennzeichnet, daß der Abstand (6) zwischen diesen Leisten (4) jeweils größer ist als die Summe, die gebildet ist durch die Breite einer im Obersieb gegenüber liegenden Leiste (3) und ihren Abstand (5) zur benachbarten im Obersieb (1) befindlichen Leiste.Shaper according to claim 3, characterized in that the distance (6) between these strips (4) is in each case greater than the sum formed by the width of a strip (3) opposite in the top wire and its distance (5) to the adjacent one in the upper sieve (1). Former nach Anspruch 3 oder 4, dadurch gekennzeichnet, daß die das Untersieb (2) zu berührenden Leisten (4) zu dem Tisch (7) in Maschinenlaufrichtung nach Bedarf versetzbar montierbar sind.Shaper according to claim 3 or 4, characterized in that the Bottom sieve (2) to be touched strips (4) to the table (7) in the machine direction can be moved as required. Former nach Anspruch 3,4 oder 5, dadurch gekennzeichnet, daß die das Untersieb (2) berührenden Leisten (4) auf dem Tisch (7) in Richtung zu dem Untersieb (2) individuell verstellbar sind.Shaper according to claim 3, 4 or 5, characterized in that the strips (4) contacting the lower sieve (2) on the table (7) are individually adjustable in the direction of the lower sieve (2). Former nach Anspruch 3,4,5 oder 6, dadurch gekennzeichnet, daß die Leisten (4) pneumatisch oder gasgepolstert hydraulisch verstellbar sind, so daß sie in der Verstellrichtung mit Hilfe eines Gaspolsters gegen den Tisch (7) elastisch abgestützt sind.Shaper according to claim 3, 4, 5 or 6, characterized in that the strips (4) are hydraulically adjustable, pneumatically or gas-cushioned, so that they are elastically supported in the direction of adjustment by means of a gas cushion against the table (7). Former nach Anspruch 3,4,5,6 oder 7, dadurch gekennzeichnet, daß der Tisch (7) mit den Leisten (4) in horizontaler Richtung relativ zur Laufrichtung der Siebe (1,2) positionierbar ist.Shaper according to claim 3, 4, 5, 6 or 7, characterized in that the table (7) with the strips (4) can be positioned in the horizontal direction relative to the running direction of the screens (1, 2). Former nach Anspruch 3,4,5,6,7 oder 8, dadurch gekennzeichnet, daß der Tisch (7) mit den Leisten (4) in vertikaler Richtung relativ zu dem Untersieb (2) positionierbar ist.Shaper according to claim 3, 4, 5, 6, 7 or 8, characterized in that the table (7) with the strips (4) can be positioned in the vertical direction relative to the lower sieve (2). Former nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Leisten (4), die das Untersieb (2) zu berühren haben, so angebracht sind, daß das durch sie aus dem Bereich des Untersiebes entfernte Wasser unmittelbar nach unten abführbar ist und auf direktem Wege in eine Auffangvorrichtung (13) gelangen kann.Shaper according to one of the preceding claims, characterized in that the strips (4) which have to touch the lower sieve (2) are attached in such a way that the water removed by them from the region of the lower sieve can be discharged directly downwards and directly Paths can get into a collecting device (13). Former nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Leisten (3,4) während des Betriebes des Formers montierbar und demontierbar sind.Shaper according to one of the preceding claims, characterized in that the strips (3, 4) can be assembled and disassembled during operation of the shaper. Former nach nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Formationsstrecke entlang einer Kurve oder eines Kurvenzuges ausgebildet ist.Shaper according to one of the preceding claims, characterized in that that the formation section is formed along a curve or a curve. Former nach nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Leisten (3), die das Obersieb (1) zu berühren haben, und die Leisten (4), die das Untersieb (2) zu berühren haben, auf der dem Sieb jeweils zugewandten Seite jeweils eine Schmiegfläche bilden und daß sich diese Schmiegflächen nicht überschneiden.Shaper according to one of the preceding claims, characterized in that the strips (3) which have to touch the top sieve (1) and the strips (4) which have to touch the bottom sieve (2) on each of the sieves facing side each form a clinging surface and that these clinging surfaces do not overlap. Former nach einem der Ansprüche 1 bis 12, dadurch gekennzeichnet, daß die Leisten (3), die das Obersieb (1) zu berühren haben, und die Leisten (4), die das Untersieb (2) zu berühren haben, auf der dem Sieb jeweils zugewandten Seite jeweils eine Schmiegfläche bilden, und daß sich diese Schmiegflächen überschneiden.Shaper according to one of claims 1 to 12, characterized in that the strips (3) which have to touch the top wire (1) and the bars (4) which have to touch the bottom wire (2) on the screen each facing side form a clinging surface, and that these clinging surfaces overlap. Former nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß an Spalten (5' ),die zwischen den Leisten (3) gebildet werden, die das Obersieb (1) zu berühren haben, einstellbares Vakuum angelegt werden kann.Shaper according to one of the preceding claims, characterized in that adjustable vacuum can be applied to gaps (5 ') which are formed between the strips (3) which have to touch the top sieve (1). Former nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Länge der Formationsstrecke oberhalb des Obersiebes (1) 500 bis 3000 mm, die Breite der Leisten (3) 10 bis 60 mm und ihre Anzahl bis 40 betragen, daß entlang der Formationsstrecke eine bis zehn Zonen gebildet wird bzw. werden und daß die Anzahl der Leisten (4) unterhalb des Untersiebes (2) 1 bis 20 beträgt.Shaper according to one of the preceding claims, characterized in that the length of the formation section above the upper sieve (1) is 500 to 3000 mm, the width of the strips (3) 10 to 60 mm and their number up to 40 that along the formation section one to ten zones are formed and that the number of strips (4) below the lower sieve (2) is 1 to 20. Former nach einem der vorherigen Ansprüche, dadurch gekennzeichnet, daß die Formationsstrecke oberhalb des Obersiebes (1) veränderbar ist, indem jeweils einige oder im Extremfall alle in Maschinenlaufrichtung aufeinander folgende Spalten (5') mit in die Abstände passenden Einlagen (8) verschlossen werden.Shaper according to one of the preceding claims, characterized in that the formation section above the upper sieve (1) can be changed in that some or, in the extreme case, all the gaps (5 ') which follow one another in the machine direction are closed with inserts (8) which match the spacing. Former nach einem der vorausgehenden Ansprüche, dadurch gekennzeichnet, daß seitlich des Doppelsiebes Einstellelemente zur Justierung des Abstandes zwischen dem Befestigungsteil, das die das Untersieb (2) berührenden Leisten (4) trägt, und dem Befestigungsteil, das die das Oberersieb (1) berührenden Leisten (3) trägt, vorhanden sind.Shaper according to one of the preceding claims, characterized in that on the side of the double sieve adjusting elements for adjusting the distance between the fastening part which carries the strips (4) contacting the bottom sieve (2) and the fastening part which carries the strips contacting the top sieve (1) (3) bears, are present. Former nach einem der vorausgehenden Ansprüche, dadurch gekennzeichnet, daß die erste und/oder letzte der im Betrieb die Siebe berührenden Leisten eine das Untersieb (2) berührende Leiste (4) ist.Shaper according to one of the preceding claims, characterized in that the first and / or last of the strips contacting the screens during operation is a strip (4) contacting the bottom screen (2). Former nach einem der vorausgehenden Ansprüche, dadurch gekennzeichnet, daß der Formationsstrecke ein Trennsauger (10) folgt, der die Ablage der feuchten Bahn auf dem Untersieb (2) gewährleistet.Shaper according to one of the preceding claims, characterized in that the formation section is followed by a separating suction device (10) which ensures that the wet web is deposited on the lower wire (2). Former nach einem der Ansprüche 1 bis 4 , dadurch gekennzeichnet, daß die die Siebe (1,2) im Betrieb berührenden Leisten (3,4) zumindest teilweise an ihrer dem Sieb zugewandten Fläche, über die Breite gesehen, nicht eben sind.Shaper according to one of claims 1 to 4, characterized in that the strips (3, 4) contacting the sieves (1, 2) during operation are at least partially flat on their surface facing the sieve, as seen across the width. Former nach einem der Ansprüche 1 bis 4 , dadurch gekennzeichnet, daß die das Untersieb (2) im Betrieb berührenden Leisten (4) zumindest teilweise an ihrer dem Sieb zugewandten Fläche über die Breite individuell verformbar sind.Shaper according to one of claims 1 to 4, characterized in that the strips (4) contacting the lower sieve (2) during operation are at least partially individually deformable over the width on their surface facing the sieve. Verwendung des Formers nach einem der vorangehenden Ansprüche in einer Kombination von Langsieb- und Doppelsiebpapiermaschine, dadurch gekennzeichnet, daß die zu entwässernde Suspension vor Erreichen des Formers auf einem Langsieb vorentwässert wird, daß im Bereich der Formers das Obersieb (1) so zugeführt wird, daß sich zwischen diesen Sieben der Aufnahmeraum für die weiter zu entwässernde Suspension bildet und daß das Langsieb innerhalb der erfindungsgemäßen Vorrichtung die Wirkungen des Untersiebes (2) erzielt.Use of the former according to one of the preceding claims in a combination of four-wire and twin-wire paper machine, characterized in that the suspension to be dewatered is pre-dewatered on a four-wire before reaching the former, so that the top wire (1) is fed in the area of the former in such a way that between these sieves the receiving space for the suspension to be dewatered forms and that the fourdrinier sieve within the device according to the invention achieves the effects of the lower sieve (2). Verwendung des Formers nach einem der Ansprüche 1 bis 22 in einer Doppelsiebpapiermaschine, dadurch gekennzeichnet, daß die zu entwässernde Suspension durch einen Stoffauflauf als Flachstrahl in den durch das Zusammenführen der Siebe (1,2) entstehenden Stoffaufnahmeraum eingeführt wird.Use of the former according to one of claims 1 to 22 in one Twin-screen paper machine, characterized in that the suspension to be dewatered is introduced through a headbox as a flat jet into the stock receiving space created by the merging of the screens (1, 2). Verwendung des Formers nach Anspruch 23 oder 24, dadurch gekennzeichnet, daß vor dem Former ein vom Obersieb (1) umschlossener Formierzylinder vorhanden ist.Use of the former according to claim 23 or 24, characterized in that a forming cylinder enclosed by the top wire (1) is present in front of the former. Verwendung des Formers nach Anspruch 23 oder 24, dadurch gekennzeichnet, daß vor dem Former ein vom Untersieb (2) umschlossener Formierzylinder vorhanden ist.Use of the former according to claim 23 or 24, characterized in that a forming cylinder enclosed by the lower wire (2) is present in front of the former.
EP90123544A 1990-01-26 1990-12-07 Former in a paper machine Expired - Lifetime EP0438685B1 (en)

Priority Applications (1)

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AT90123544T ATE101217T1 (en) 1990-01-26 1990-12-07 SHAPER IN A PAPER MACHINE.

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DE4002304 1990-01-26
DE4002304A DE4002304A1 (en) 1990-01-26 1990-01-26 Paper forming stretch

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EP0438685A1 true EP0438685A1 (en) 1991-07-31
EP0438685B1 EP0438685B1 (en) 1994-02-02

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JP (1) JP2996747B2 (en)
AT (1) ATE101217T1 (en)
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DE (2) DE4002304A1 (en)
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Also Published As

Publication number Publication date
JPH04327290A (en) 1992-11-16
US5320713A (en) 1994-06-14
FI910362A (en) 1991-07-27
CA2034993C (en) 1996-03-19
FI109711B (en) 2002-09-30
ATE101217T1 (en) 1994-02-15
FI910362A0 (en) 1991-01-24
JP2996747B2 (en) 2000-01-11
CA2034993A1 (en) 1991-07-27
DE4002304C2 (en) 1992-02-06
DE4002304A1 (en) 1991-08-14
EP0438685B1 (en) 1994-02-02
DE59004517D1 (en) 1994-03-17

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