EP2217759B1 - Device for transferring a paper web from a supporting fabric to another - Google Patents

Device for transferring a paper web from a supporting fabric to another Download PDF

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Publication number
EP2217759B1
EP2217759B1 EP07847207A EP07847207A EP2217759B1 EP 2217759 B1 EP2217759 B1 EP 2217759B1 EP 07847207 A EP07847207 A EP 07847207A EP 07847207 A EP07847207 A EP 07847207A EP 2217759 B1 EP2217759 B1 EP 2217759B1
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EP
European Patent Office
Prior art keywords
web
fabric
suction box
felt
press
Prior art date
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Application number
EP07847207A
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German (de)
French (fr)
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EP2217759A1 (en
Inventor
Jyrki Savela
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Valmet Technologies Oy
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Metso Paper Oy
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Publication of EP2217759A1 publication Critical patent/EP2217759A1/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F2/00—Transferring continuous webs from wet ends to press sections
    • 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
    • D21F3/00—Press section of machines for making continuous webs of paper
    • D21F3/02—Wet presses
    • D21F3/04—Arrangements thereof
    • D21F3/045—Arrangements thereof including at least one extended press nip

Definitions

  • the subject of the present invention is a device for transferring a paper web from one support fabric to the other.
  • the device according to the invention is thus suitable, for example, for transferring the web from the wire section onto the press felt and from the press felt into the dryer section.
  • the device is particularly advantageous when transferring the paper or board web from the first press of the press section of the paper, board or other corresponding machine into the second press.
  • the device according to the invention can also be used at all or almost all locations in a paper machine, where the web is transferred from one fabric to another.
  • a conventional apparatus for having the features of the preamble of claim 1, is known from US 4,236,962 known.
  • the press section following the wire section of the paper machine usually consists of two presses arranged one behind the other, in which the paper web is usually transported by at least one felt, more generally supported by a fabric, from one press nip to the other, wherein the Paper web also runs supported over part of the stretch between two tissues.
  • tissue can also be understood as a transfer band.
  • the paper web from the first press ie the first press nip into the second press, ie the second press nip
  • it must first be removed from the first, for example upper felt of the first press and adhered to the second, for example lower felt.
  • the web, carried by said second felt is guided to the second press where it is placed on the felts of the second press. This is basically done in such a way that the web is first brought into contact with the first felt of the second press and then detached from the second felt of the first press, adhered to the first felt of the second press and in contact with the second felt of the second Press is brought.
  • Critical places in the web guide are those places where the web is detached from a felt and transferred to the next fabric. If the detachment of the web is not done carefully, there is a risk of web breaks or web breaks.
  • the point of detachment, ie lifting of the web is usually in a felt guide roller, which rotates around a felt of the first press, while the other felt continues its way relatively straight past the roller.
  • the first felt circulates around the roll, the web naturally has a centrifugal force which is dependent on the roll diameter and the roll speed, but in any case is relatively large, which, of course, tends to detach the web from the first felt.
  • suction rolls and transfer suction boxes their use for example in US 5,888,354 is described. Both types operate in principle so that suction is applied to the web by the felt continuing to support the web so that the web is released both from the felt located on the side opposite the suction device and at the suction side of the suction device Felt sticks.
  • Suction rolls are in themselves reliable devices, the use of which generally causes no problems in actually detaching the web from the first felt or holding the web to the second felt.
  • suction rolls problems of another kind in appearance First, adjusting the Saugsektorweite designed in suction rolls consuming and complicated, and secondly, suction rollers are expensive to buy, in operation and in maintenance.
  • the transfer suction box as a second option is considerably cheaper to buy and operate.
  • the use of the transfer suction box for detaching / lifting the paper web from the wire is treated.
  • this document is set out in detail how the paper web is guided together with wire and felt around the roller. In the vicinity of the roller, but behind this a transfer suction box is arranged, with which the web is detached from the wire.
  • the felt and the transfer suction box are arranged so that the felt and with it the web across the transfer suction box the sieve direction is deflected by an angle of less than 45 degrees.
  • the felt web undergoes a curvature, which leads to increased wear of both the lid and the felt.
  • the transfer suction box can not be used in very fast paper machines, because, as already mentioned above, the lid of the suction box and also the running over this felt wear out.
  • the felt barrel is traditionally set up so that the felt on the suction box changes its direction of travel and the felt is pressed against the suction box lid due to its tension.
  • both the above-mentioned change of the felt running direction on the suction box and the vacuum of the suction box suck the felt against the suction box lid, resulting in rapid wear of both the felt and the suction box lid.
  • This wear is reinforced when the felt runs at high speed over the suction box lid. For this reason, with the increasing speed of paper machines, the use of the transfer suction box has been steadily reduced.
  • the present invention seeks to remedy shortcomings of the prior art devices by providing a new type of solution for safely transferring the paper web from one support fabric to another.
  • Said solution comprises a suitable device and is based on the use of a transfer suction box such that the speed of the machine no longer has any influence on the wear of the box lid or the felt.
  • the object is achieved with a device according to claim 1.
  • a solution according to the invention takes place on the transfer suction no significant change in direction of the fabric / the paper web to the lid, so that the tension of the web / tissue causes no suction directed towards the suction force.
  • the only load which may be applied to the sack box cover is the suction force caused by the vacuum of the suction box.
  • the tissue does not touch the suction box at all, so that said wear problem is eliminated.
  • the required train of the paper web can be generated at the transfer point to ensure the safe web run.
  • the suction of the suction device is directed to the guide roller located on the side opposite to the suction device of the web and the paper web is detached from the guide roller side fabric substantially at the point at which the direction of movement of the guide roller side fabric, the guide roller following, from the direction of movement begins to diverge away at the suction device side tissue and at this point also an air layer laterally outside the edge of the paper web is sucked through substantially at the location of the web separation through the tissue.
  • a slot located in the lid of the suction means or a series of discrete openings extending transversely of the paper web is placed beginning at the plane passing through the axial centerline of the guide roll and through the line from which the paper web begins to follow from the guide roll triggers, runs.
  • the slot or the row of discrete openings may be longer than the width of the paper web and be shorter than the width of the located on the side of the suction device tissue.
  • suction is applied to the infeed nip of the guide roll where the overpressure tends to dislodge the web from the leader roll side fabric.
  • suction means for transferring the web from a backing to another serving device located on at least either side of the web, suction means for releasing the web from the first web, the web then being carried by the second web and one opposite to the sucker Side of the web and the fabric guide roller, with which the fabric from which the web has been peeled, is transported, it is characteristic that said suction means of a transfer suction box with a lid and one or more suction slots or one or more rows of discrete openings is transverse to the fabric erection in this cover and this suction box is arranged at the guide roller, that one of the slots of the lid is substantially at that point of the guide roller to lie where the roller surface starts to diverge away from the direction of the onulsaugkastenrenten tissue, wherein yourself at least one of the slots or one of the series of openings under the second fabric extends across a width greater than the width of the web resting on the fabric.
  • the slot or row of discrete openings is shorter than the width of the tissue located on the side of the suction
  • one of the slots of the lid is located at the inlet gusset of the guide roller.
  • Fig. 1 shows a partial view of a prior art and in the U.S. Patent 5,888,354 treated paper machine press section including the device for transferring the paper web from one press part part into the other.
  • the press section shown in the drawing consists of a first press 10 and a second press 20.
  • the first press is formed in the drawing by the shoe roll 12 and its counter roll 14, by the nip of the paper web lying between two felts 32 and 34 in the illustration running from left and right.
  • the first felt 32 runs as a loop, within which the shoe roll 12 is located, around the in this case adjustable felt guide roll 16 and continues its way upwards.
  • the second felt 34 in turn passes over the counter-roller 14.
  • the paper web W is detached by means of the transfer suction box 18 on the route between the counter-roller 14 and the felt-guiding roller 16 from the first felt 32.
  • the suction of the suction box 18 is applied to the web W through the second felt 34 to release the web from the first felt 32. Since at the same time the running direction of the first felt 32 no longer leads along the lid of the suction box 18, but slightly runs higher, the detachment of the paper web W succeeds easily from the first felt.
  • the suction of the suction box 18 also ensures that the paper web W adheres to the second felt 34.
  • the second felt 34 is raised by means of the suction box 18 so as to ensure that the second felt is constantly in contact with the lid of the suction box 18, which in turn ensures that a uniform suction is constantly applied to the paper web W. that reliably holds the web W on the second felt 34.
  • a procedure is associated with a relatively high wear load of the suction box lid, as a result of which both the lid and the press felt wear out quickly. This is the case especially at higher production speeds, eg over 1100 m / min.
  • the paper web W is, lying on the second felt 34, passed into the second part 20 of the press section, ie in the second press, which is represented in the drawing by the third felt 22 and the transfer suction roll 24.
  • the transfer suction roll 24 serves to lift the paper web from the second felt 34 of the first press 10 before this second felt 34 is passed down the roll 26.
  • the suction roll removes the paper web from the second felt 34 in the same manner as described above in connection with the transfer suction box 18.
  • the third felt 22 here representing the second press 20 transports the paper web W until the fourth felt (not shown) assigned to the second press is added from below, the paper web then being again located between two felts. into the nip of the second press and possibly also in further following nips is performed.
  • Fig. 2 is a completely equivalent and also in the U.S. Patent 5,888,354 treated paper machine press section, wherein the same reference numerals designate the same components.
  • the only difference from in Fig. 1 The solution shown is that the in Fig. 1 shown transfer suction 18 is now replaced by the suction roller 18 ', with the completely same function as with the suction box 18 is achieved. In this solution eliminated by the rotating suction roller 18 'the problem of felt and the Saugkastendeckel wear.
  • Fig. 3 shows a general view of a device according to the invention, ie, a preferred embodiment of the invention having press section of a paper machine.
  • the press section in Fig. 3 consists of the first press 40 built around the first press nip 42 and the second press 60 built around the second press nip 62.
  • the web W for example, carried by the wire 44, passes from the wire section of the paper machine into the first press 40 Sieve 44, the web, using the transfer suction box 48 and the guide roller 50 is placed on the first press felt 46.
  • the web W supported by the first press felt 46 is fed into the press nip 42 between said felt 46 and the press felt 52.
  • the web located between the felt 46 and the press felt 52, passes to the guide roll 54, where the web is removed from the press felt 52 by means of the transfer suction box 56 located on the opposite side of the web from the guide roll 54.
  • the press felt 52 continues its way down, and the web is guided by the press felt 46 to the second press 60.
  • the web is first brought into contact with a third press felt 66 before the press nip 62, then detached from the press felt 46 by means of the transfer suction box 68 and laid down on the third press felt 66. Thereafter, the web, between the third press felt 66 and the first transfer belt 72 located, passed through the second press nip 62.
  • the press felt 66 is released from the web and deflected at the guide roller 70.
  • the web has a large adhesion to the transfer belt 72 so as to follow the path of the transfer belt 72.
  • the web is brought into contact with a dry transfer felt 166 and deposited on the transfer felt 166 by means of the transfer suction box 169. This conveys the web further into the dryer section of the machine.
  • Fig. 4 shows a very similar construction of a press section of a paper machine, wherein the same reference numerals as in Fig. 3 be used for the designation of functionally identical parts. Deviating from Fig. 3 Here, the web is transferred from the transfer belt 72 by means of a suction roll 170 on the dry or transfer felt 166.
  • preferred embodiment of the invention following solution for transferring the paper web from the first press 40 of the paper machine in the second press 60 passes the paper web, located between the first press felt 46 and the second press felt 52, coming from the left to the felt guide roll 54 of the pressing devices that is to the Example may consist of a shoe press or a roller press.
  • a transfer suction box 56 is arranged in the roller 54, the lid 80 of which has two slots 82 and 82 in the embodiment shown.
  • the first slot 82 viewed in the direction of web travel is preferably located exactly at the guide roller 54.
  • the slot may also be at the entry gusset (left in the drawing) or, relative to the roller 54, at the location of the web where the first press felt 46 is the surface following the roller 54, a direction that deviates from the direction of the second press felt, that is to say it is arranged on the outlet gusset (on the right in the drawing).
  • the first slot 82 may begin at the plane passing through the axial centerline of the guide roller 54 and through the line at which the paper web is released from the felt 46 beginning to follow the guide roller 54. It should also be noted that the number of slots is also decisive for their placement. In other words, the more slots there are, the farther away from the guide roller location may be the outermost slots.
  • the transfer suction box 56 is adapted to peel the paper web from the first felt 46 following the surface of the guide roll 54 and hold it against the surface of the second press felt 52.
  • a second slot in the lid 80 of the transfer suction box 56 behind the release point serves the purpose of securing the adherence of the web to the fabric 52 even after the actual detachment operation;
  • the web can be held to the fabric 52 through conventional vacuum boxes 58 to the guide roll 64 of the third press felt 66 of the second press 60.
  • Essential to the placement of the transfer suction box 56 according to the first embodiment of this invention is in addition to the arrangement of the first slot 82 of the suction box lid 80 so that it begins at the latest substantially at the point where the press felt 46 and the paper web W separate from each other, -
  • the suction is located on the previous inlet gore -
  • the lid 80 of the suction box 56 is flat or (in the case that the lid of the shape of the roll surface follows) is preferably concave, and that the course of the lid 80th of the suction box 56 coincides with the course of the fabric 52.
  • the Saugkastendeckel 80 causes no directional changes of the fabric 52, but the press felt 52 moves from the guide roller 54 from exactly in the direction determined by the guide roller 64 of the second press 60 direction.
  • Fig. 5 As a second preferred embodiment of the invention, it is also shown how the web is detached from the second press felt 52 and brought to adhere to the third press felt 66. This is done by arranging within the second press felt loop a guide roll 70 around which the press felt 52 is guided, while at the same time the transfer suction box 68 located within the third press felt loop 66 at the guide roll 70 lifts the web from the press felt 52 and onto the press felt 66 transferred.
  • the cover 86 of the transfer suction box 68 corresponding to this second embodiment has only one slot 88, this slot 88 having to be placed in the web running direction at the point where the press felt 52 separates from the press felt 66.
  • transfer suction box solutions according to a third and fourth preferred embodiment of the invention are shown in the transfer of the paper web from the first to the second press nip of the paper machine.
  • the paper web located between the first press felt 46 and the second fabric 52, arrives from the left as far as the guide roll 54.
  • a transfer suction box 56 is provided on the side of the fabric 52 in the roll 54 arranged, the lid 90 is concave-shaped and in the embodiment shown four slots 92, 94, 96 and 98 has.
  • the placement and operating principle of the last two slots 96 and 98 are substantially the same as those of the slots 82 and 82 of the previously described embodiment, ie, they serve to release the web from the first press felt 46 (slot 96) and hold the web on the web Fabric 52 (slot 98).
  • the slots 92 and 94 located in front are in the region of the inlet gusset of the guide roller 54. Since there is overpressure in the inlet gusset, the slots located in this area serve the purpose of detaching the web from the first press felt 46 before the guide roller 54.
  • the suction prevailing in the slots 92 and 94 enhances the differential pressure exiting the web from the felt.
  • the lid 90 of the transfer suction box has the same course as the fabric 52.
  • Fig. 6 the transfer of the paper web from the second felt 52 to the third press felt 66 is shown. This process begins with the detachment of the paper web from the second press felt 52.
  • the lid 100 of the transfer suction box 68 is designed differently is.
  • the lid 100 has two slots 102 and 104, which are positioned so that the first slot 102 is in the region of the inlet gusset of the guide roller 70 (ie on the side of the incoming web) and the second slot 104 in the region of the outlet gusset.
  • the slits 102 and 104 serve the purpose of first releasing the web from the press felt 52 (102) and then adhering it to the third press felt 66 (104).
  • a web having a dry content of 16% showed a good transfer history.
  • the dry content should not be below 25%.
  • the width of the usually one to five slots 114 and 116 in the lid 112 of the in Fig. 7 shown box 110 is on the order of 5-20 mm. It has been found that with larger slot widths the felt bends into the slot, resulting in both slot and felt wear. Also, then the Sog pressure increases significantly.
  • the cover strips 118 are preferably made of ceramic material and are rounded at their edges to minimize wear of the strips 118 and the felt. In certain cases, plastic strips can also be considered.
  • the strips 118 are inserted into holders 120, which are fastened by means of a form-fitting connection to counter profiles 122 of the suction box 110 in order to be able to exchange the strips 118 easily.
  • the strips are resiliently mounted, this can, for. B. by a gas-filled tube (not shown) can be achieved in Fig. 7 between the Holder 120 and the counter-profile 122 would be inserted. This spring action prevents a shock on the strips when suddenly a thicker lump of paper between the suction box and the guide roller device, z. B. lies between the felts.
  • Fig. 8 shows a transfer point similar to the transfer between press felt 46 and press felt 52 in Fig. 5 however, only one slot 82 is shown in the transfer suction box 56 here.
  • the illustration shows a view from below Fig. 5 with press felt 46 and guide roll 54 omitted.
  • Fig. 8 It is clearly shown that the press felt 52, the slit 82 and the web W have a decreasing width in this order. In other words, the felt is wider than the slot and the slot is wider than the track.
  • an air layer is extracted in an edge region 200 on both sides of the web W.
  • Slidable side shutters 182 allow the width of the slot 82 to be adjusted to adjust the width of the extracted air layer. It has further been shown that it is advantageous if the lateral projection of the press felt 52 over the slot 82 is greater than the projection of the slot 82 over the web W. In other words, the dimension Y may preferably be greater than X in Fig. 8 However, the invention also works satisfactorily when X and Y are about the same. If Y is chosen large compared to X. This has beneficial effects on energy consumption and tissue wear. Advantageous dimensions are 5 to 150 mm for X and in particular 40 to 70 mm for X. Good results have been achieved at values of 100 to 200 now for the value Y.
  • the slit (s) may also be implemented as one or more series of discrete openings extending in the transverse direction of the web (width direction).
  • the openings are circular holes or short slots or the like.
  • FIG. 9 a schematic side view of a transfer point to which the invention is applied.
  • a preferably compressed air-filled hose 180 is provided which carries the bar 118.
  • FIG. 9 also shows a dimension Z that can be adjusted between the lid of the suction box 56 (shown here as the upper edge of the strips 118) and the web-receiving felt 52. It has been found that good results are obtained in the transfer of the web, even if there is a distance (dimension Z) between the suction box lid and the receiving felt. Good results have been obtained for values of Z in the range of 0.5 to 5 mm and in particular in the range of 1 to 3 mm.
  • the devices described operate at pressures in the suction box which are from 1 to 40 kPa and in particular from 15 to 35 kPa below the ambient pressure.
  • the device according to the invention can be used not only for the transfer of the web within the press section described here by way of example, but also in connection with other web transfer stations of the paper machine. It is further understood that although the invention has been referred to exclusively as paper machines above, the invention is equally applicable to carton, tissue and pulp machines. Thus, the term "paper” also includes cardboard as a subgroup.

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Abstract

The object of the present invention is a method and a device for transferring a paper web from a supporting woven fabric to another. The method according to the invention and the device according to the present invention are therefore suitable, for example, for transferring a web from the wire section onto a press felt and from the press into the dryer section. The use of the method and of the device is particularly advantageous when transferring the paper web in the press section of the paper machine from the first to the second press. The key aspect of the method according to the invention and of the device according to the invention is that when detaching the paper web W from the supporting woven fabric (46) a transfer suction box (56) is used in conjunction with the felt guide roller (54), wherein the cover of said box substantially has the same direction as the paper web (W) running from the felt guide roller (54) to the subsequent roller (64) such that said cover does not change the running direction of the web W and suctions an air layer strip (200) on both sides of the web W through the woven fabric (46).

Description

Gegenstand der vorliegenden Erfindung ist eine Vorrichtung zum Überführen einer Papierbahn von einem Stützgewebe auf das andere. Die erfindungsgemäße Vorrichtung eignet sich somit zum Beispiel zum Überführen der Bahn von der Siebpartie auf den Pressfilz und vom Pressfilz in die Trockenpartie. Besonders vorteilhaft gestaltet sich die Vorrichtung beim Überführen der Papier- oder Kartonbahn von der ersten Presse der Pressenpartie der Papier-, Karton- oder anderen entsprechenden Maschine in die zweite Presse. Ferner kann die erfindungsgemäße Vorrichtung auch an allen oder nahezu allen Orten in einer Papiermaschine eingesetzt werden, wo die Bahn von einem Gewebe auf ein anderes Gewebe überführt wird. Eine herkömmliche Vorrichtung dafür die die Merkmale des Oberbegriffs von Anspruch 1 hat, ist aus der US 4 236 962 bekannt.The subject of the present invention is a device for transferring a paper web from one support fabric to the other. The device according to the invention is thus suitable, for example, for transferring the web from the wire section onto the press felt and from the press felt into the dryer section. The device is particularly advantageous when transferring the paper or board web from the first press of the press section of the paper, board or other corresponding machine into the second press. Furthermore, the device according to the invention can also be used at all or almost all locations in a paper machine, where the web is transferred from one fabric to another. A conventional apparatus for having the features of the preamble of claim 1, is known from US 4,236,962 known.

Im Folgenden werden ein Papierbahn-Überführungsverfahren und eine Papierbahn-Überführungsvorrichtung nach dem Stand der Technik am Beispiel der Pressenpartie einer Papiermaschine eingehender beschrieben. Gegenwärtig besteht die auf die Siebpartie der Papiermaschine folgende Pressenpartie meistens aus zwei hintereinander angeordneten Pressen, in denen die Papierbahn meistens von wenigstens einem Filz, allgemeiner gesagt von einem Gewebe gestützt von einem Pressnip zum anderen transportiert wird, wobei die Papierbahn auch über einen Teil der Strecke zwischen zwei Geweben gestützt läuft. In diesem Zusammenhang kann unter dem Begriff "Gewebe" auch ein Transferband verstanden werden. Beim Überführen der Papierbahn von der ersten Presse, d.h. dem ersten Pressnip in die zweite Presse, d.h. den zweiten Pressnip muss sie zunächst vom ersten, zum Beispiel oberen Filz der ersten Presse abgelöst und am zweiten, zum Beispiel unteren Filz haftend gehalten werden. Danach wird die Bahn, vom besagten zweiten Filz getragen, zur zweiten Presse geführt, wo sie auf die Filze der zweiten Presse gebracht wird. Dies geschieht im Grunde in der Weise, dass die Bahn zunächst mit dem ersten Filz der zweiten Presse in Berührung gebracht wird und dann vom zweiten Filz der ersten Presse abgelöst, am ersten Filz der zweiten Presse haftend gehalten und in Kontakt mit dem zweiten Filz der zweiten Presse gebracht wird.Hereinafter, a paper web transfer method and a prior art paper web transfer device will be described in more detail using the example of the press section of a paper machine. At present, the press section following the wire section of the paper machine usually consists of two presses arranged one behind the other, in which the paper web is usually transported by at least one felt, more generally supported by a fabric, from one press nip to the other, wherein the Paper web also runs supported over part of the stretch between two tissues. In this context, the term "tissue" can also be understood as a transfer band. When transferring the paper web from the first press, ie the first press nip into the second press, ie the second press nip, it must first be removed from the first, for example upper felt of the first press and adhered to the second, for example lower felt. Thereafter, the web, carried by said second felt, is guided to the second press where it is placed on the felts of the second press. This is basically done in such a way that the web is first brought into contact with the first felt of the second press and then detached from the second felt of the first press, adhered to the first felt of the second press and in contact with the second felt of the second Press is brought.

Kritische Stellen bei der Bahnführung sind jene Stellen, an denen die Bahn von einem Filz abgelöst und auf das nächste Gewebe überführt wird. Erfolgt das Ablösen der Bahn nicht sorgfältig, besteht die Gefahr von Bahnabrissen oder Bahneinrissen. Die Stelle des Ablösens, d.h. Abhebens der Bahn befindet sich meistens bei einer Filzleitwalze, welche der eine Filz der ersten Presse umläuft, während der andere Filz seinen Weg relativ gerade an der Walze vorbei fortsetzt. Beim Umlaufen des ersten Filzes um die Walze wirkt auf die Bahn natürlich eine vom Walzendurchmesser und der Walzendrehzahl abhängige, auf jeden Fall aber relativ große Zentrifugalkraft, die natürlich bestrebt ist, die Bahn vom ersten Filz abzulösen. Es hat sich aber gezeigt, dass man sich auf die Zentrifugalkraft allein nicht verlassen kann, sondern dass das Ablösen der Bahn gewöhnlich durch irgendeine Sauganordnung vor der besagten Walze unterstützt werden muss.Critical places in the web guide are those places where the web is detached from a felt and transferred to the next fabric. If the detachment of the web is not done carefully, there is a risk of web breaks or web breaks. The point of detachment, ie lifting of the web is usually in a felt guide roller, which rotates around a felt of the first press, while the other felt continues its way relatively straight past the roller. When the first felt circulates around the roll, the web naturally has a centrifugal force which is dependent on the roll diameter and the roll speed, but in any case is relatively large, which, of course, tends to detach the web from the first felt. However, it has been found that one can not rely on the centrifugal force alone, but that the separation of the web must usually be supported by any suction arrangement in front of said roller.

Von den besagten Sauganordnungen gibt es zwei verschiedene Grundtypen: Saugwalzen und Transfersaugkästen, deren Einsatz zum Beispiel in US 5,888,354 beschrieben ist. Beide Typen funktionieren im Prinzip so, dass durch den die Bahn weiterhin stützenden Filz hindurch Sog auf die Bahn so ausgeübt wird, dass sich die Bahn sowohl von dem auf der zur Saugeinrichtung entgegengesetzten Seite befindlichen Filz löst als auch an dem auf der Seite der Saugeinrichtung befindlichen Filz haften bleibt. Saugwalzen sind an sich zuverlässige Geräte, bei deren Einsatz im Allgemeinen keine Probleme beim eigentlichen Ablösen der Bahn vom ersten Filz oder beim Halten der Bahn an dem zweiten Filz auftreten. Allerdings treten beim Einsatz von Saugwalzen Probleme anderer Art in Erscheinung: Erstens gestaltet sich das Einstellen der Saugsektorweite bei Saugwalzen aufwendig und kompliziert, und zweitens kommen Saugwalzen in der Anschaffung, im Betrieb und in der Instandhaltung teuer zu stehen.Of the said suction arrangements, there are two different basic types: suction rolls and transfer suction boxes, their use for example in US 5,888,354 is described. Both types operate in principle so that suction is applied to the web by the felt continuing to support the web so that the web is released both from the felt located on the side opposite the suction device and at the suction side of the suction device Felt sticks. Suction rolls are in themselves reliable devices, the use of which generally causes no problems in actually detaching the web from the first felt or holding the web to the second felt. However, the use of suction rolls problems of another kind in appearance: First, adjusting the Saugsektorweite designed in suction rolls consuming and complicated, and secondly, suction rollers are expensive to buy, in operation and in maintenance.

Der Transfersaugkasten als zweite Möglichkeit ist sowohl in der Anschaffung als auch im Betrieb beträchtlich günstiger. Zum Beispiel in der US-Patentschrift 4,113,557 wird der Einsatz des Transfersaugkastens zum Ablösen/Abheben der Papierbahn vom Sieb behandelt. In besagter Schrift ist detailliert dargelegt, wie die Papierbahn zusammen mit Sieb und Filz um die Walze herum geführt wird. In der Nähe der Walze, jedoch hinter dieser ist ein Transfersaugkasten angeordnet, mit dem die Bahn vom Sieb abgelöst wird. Um eine hohe Saugwirkung auf die Bahn zu erhalten, d. h. eine Anlage des Filzes an dem Transfersaugkasten sicherzustellen, werden der Filz und der Transfersaugkasten so angeordnet, dass der Filz und mit ihm die Bahn durch den Transfersaugkasten gegenüber der Siebrichtung um einen Winkel von unter 45 Grad abgelenkt wird. Mit anderen Worten, auf dem konvexen Deckel des Saugkastens erfährt die Filzbahn eine Krümmung, was zu erhöhtem Verschleiß sowohl des Deckels auch des Filzes führt.The transfer suction box as a second option is considerably cheaper to buy and operate. For example in the U.S. Patent 4,113,557 the use of the transfer suction box for detaching / lifting the paper web from the wire is treated. In this document is set out in detail how the paper web is guided together with wire and felt around the roller. In the vicinity of the roller, but behind this a transfer suction box is arranged, with which the web is detached from the wire. In order to obtain a high suction effect on the web, ie to ensure installation of the felt on the transfer suction box, the felt and the transfer suction box are arranged so that the felt and with it the web across the transfer suction box the sieve direction is deflected by an angle of less than 45 degrees. In other words, on the convex lid of the suction box, the felt web undergoes a curvature, which leads to increased wear of both the lid and the felt.

Allerdings kann der Transfersaugkasten nicht in sehr schnellen Papiermaschinen eingesetzt werden, weil, wie oben bereits erwähnt, der Deckel des Saugkastens und auch der über diesen laufende Filz sich abnutzen. Die Ursache dafür ist, dass der Filzlauf traditionell so eingerichtet ist, dass der Filz auf dem Saugkasten seine Laufrichtung ändert und der Filz infolge seiner Spannung gegen den Saugkastendeckel gepresst wird. Mit anderen Worten, sowohl die oben genannte Änderung der Filzlaufrichtung auf dem Saugkasten als auch das Vakuum des Saugkastens saugen den Filz gegen den Saugkastendeckel, wobei es zu einer schnellen Abnutzung sowohl des Filzes als auch des Saugkastendeckels kommt. Verstärkt wird diese Abnutzung noch, wenn der Filz mit hoher Geschwindigkeit über den Saugkastendeckel läuft. Aus diesem Grunde hat sich mit zunehmender Geschwindigkeit der Papiermaschinen der Einsatz des Transfersaugkastens ständig verringert.However, the transfer suction box can not be used in very fast paper machines, because, as already mentioned above, the lid of the suction box and also the running over this felt wear out. The reason for this is that the felt barrel is traditionally set up so that the felt on the suction box changes its direction of travel and the felt is pressed against the suction box lid due to its tension. In other words, both the above-mentioned change of the felt running direction on the suction box and the vacuum of the suction box suck the felt against the suction box lid, resulting in rapid wear of both the felt and the suction box lid. This wear is reinforced when the felt runs at high speed over the suction box lid. For this reason, with the increasing speed of paper machines, the use of the transfer suction box has been steadily reduced.

Weitere einschlägige Vorrichtungen sind aus US 2002/0060054 A1 , DE 103 33 525 A1 , EP 0153288 A . US 4 964 956 und WO 98/44193 bekannt.Other relevant devices are made US 2002/0060054 A1 . DE 103 33 525 A1 . EP 0153288 A , US 4,964,956 and WO 98/44193 known.

Mit der vorliegenden Erfindung sollen Mängel der dem Stand der Technik entsprechenden Vorrichtungen durch Bereitstellung einer Lösung neuen Typs zum sicheren Überführen der Papierbahn von einem Stützgewebe aufs andere beseitigt werden. Die besagte Lösung umfasst eine geeignete Vorrichtung und basiert auf dem Einsatz eines Transfersaugkastens derart, dass die Geschwindigkeit der Maschine keinen Einfluss mehr auf die Abnutzung des Kastendeckels oder des Filzes hat. Die Aufgabe wird mit einer Vorrichtung nach Anspruch 1 gelöst.The present invention seeks to remedy shortcomings of the prior art devices by providing a new type of solution for safely transferring the paper web from one support fabric to another. Said solution comprises a suitable device and is based on the use of a transfer suction box such that the speed of the machine no longer has any influence on the wear of the box lid or the felt. The object is achieved with a device according to claim 1.

Bei einer erfindungsgemäßen Lösung erfolgt auf dem Transfersaugkasten keine wesentliche Richtungsänderung des Gewebes/der Papierbahn zum Deckel hin, so dass die Spannung der Bahn/des Gewebes keine zum Saugkasten hin gerichtete Kraft bewirkt. Somit ist die einzige Last, die gegebenenfalls auf den Saugkastendeckel wirkt, jene Ansaugkraft, die durch das Vakuum des Saugkastens hervorgerufen wird. In diesem Zusammenhang wird betont, dass es Umsetzungen der erfindungsgemäßen Lösung gibt, in denen das Gewebe den Saugkasten überhaupt nicht berührt, so dass das genannte Verschleißproblem beseitigt ist. Im Übrigen kann bei der erfindungsgemäßen Lösung auch der erforderliche Zug der Papierbahn an der Übergabestelle erzeugt werden, um den sicheren Bahnlauf zu gewährleisten.In a solution according to the invention takes place on the transfer suction no significant change in direction of the fabric / the paper web to the lid, so that the tension of the web / tissue causes no suction directed towards the suction force. Thus, the only load which may be applied to the sack box cover is the suction force caused by the vacuum of the suction box. In this connection, it is emphasized that there are implementations of the inventive solution in which the tissue does not touch the suction box at all, so that said wear problem is eliminated. Incidentally, in the solution according to the invention also the required train of the paper web can be generated at the transfer point to ensure the safe web run.

Von den weiteren Vorteilen, die die Erfindung neben einer sehr sicheren Bahnübergabe bietet, seien u.a. genannt:

  • Beträchtlich kostengünstiger in der Anschaffung und im Betrieb als die gegenwärtige Saugwalze, weil der Saugkasten schon allein als Konstruktion vorteilhafter als die Saugwalze ist, ganz zu schweigen vom Betrieb und Energieverbrauch;
  • Geringere bis gar keine Abnutzung des Saugkastendeckels verglichen mit den heutigen Saugkastenlösungen;
  • Geringere bis gar keine Abnutzung des Filzes verglichen mit den heutigen Saugkastenlösungen.
  • An allen Übergabestellen können die Walzen gleiche Abmessungen haben; dadurch ist eine geringere Anzahl von Ersatzteilen vorzuhalten.
Of the other advantages offered by the invention in addition to a very safe rail transfer, may include:
  • Significantly less expensive to buy and operate than the current suction roll, because the suction box alone as a construction is more advantageous than the suction roll, not to mention the operation and energy consumption;
  • Less or no wear on the suction box lid compared to today's suction box solutions;
  • Less or no wear on the felt compared to today's suction box solutions.
  • At all transfer points, the rolls can have the same dimensions; This is a lesser number of spare parts vorzuhalten.

Für das zum Überführen der Papierbahn von einem Stützgewebe aufs andere dienende Verfahren, bei dem die Papierbahn, zwischen zwei Geweben befindlich, an die Saugeinrichtung herangeführt wird, die Papierbahn mit der Saugeinrichtung von jenem Gewebe, das sich auf der zur Saugeinrichtung entgegengesetzten Seite der Bahn befindet, abgelöst und auf dem Gewebe, das sich auf der Seite der Saugeinrichtung befindet, weitertransportiert wird, ist der Sog der Saugeinrichtung auf die auf der zur Saugeinrichtung entgegengesetzten Seite der Bahn befindliche Leitwalze gerichtet und die Papierbahn wird von dem leitwalzenseitigen Gewebe im Wesentlichen an jener Stelle abgelöst, an der die Bewegungsrichtung des leitwalzenseitigen Gewebes, der Leitwalze folgend, von der Bewegungsrichtung des saugeinrichtungsseitigen Gewebes weg zu divergieren beginnt und an dieser Stelle zudem eine Luftschicht seitlich außerhalb des Randes der Papierbahn im Wesentlichen an der Stelle der Bahnablösung durch das Gewebe hindurch abgesaugt wird. Vorzugsweise wird ein im Deckel der Saugeinrichtung befindlicher Schlitz oder eine sich in Querrichtung der Papierbahn erstreckende Reihe diskreter Öffnungen an jener Ebene beginnend angeordnet, die durch die Achsmittellinie der Leitwalze und durch die Linie, an der sich die Papierbahn von dem der Leitwalze zu folgen beginnenden Gewebe löst, läuft. Dabei kann der Schlitz oder die Reihe diskreter Öffnungen länger sein als die Breite der Papierbahn und kürzer sein als die Breite des auf der Seite der Saugeinrichtung befindlichen Gewebes.For the process of transferring the paper web from one support fabric to the other serving method, wherein the Paper web, located between two tissues, is brought to the suction device, the paper web with the suction of that tissue, which is located on the suction device opposite side of the web, detached and transported on the fabric, which is located on the side of the suction device is the suction of the suction device is directed to the guide roller located on the side opposite to the suction device of the web and the paper web is detached from the guide roller side fabric substantially at the point at which the direction of movement of the guide roller side fabric, the guide roller following, from the direction of movement begins to diverge away at the suction device side tissue and at this point also an air layer laterally outside the edge of the paper web is sucked through substantially at the location of the web separation through the tissue. Preferably, a slot located in the lid of the suction means or a series of discrete openings extending transversely of the paper web is placed beginning at the plane passing through the axial centerline of the guide roll and through the line from which the paper web begins to follow from the guide roll triggers, runs. In this case, the slot or the row of discrete openings may be longer than the width of the paper web and be shorter than the width of the located on the side of the suction device tissue.

Für das obige Verfahren wird am Einlaufzwickel (-spalt) der Leitwalze, wo der Überdruck die Bahn vom leitwalzenseitigen Gewebe abzulösen trachtet, Sog eingesetzt.For the above method suction is applied to the infeed nip of the guide roll where the overpressure tends to dislodge the web from the leader roll side fabric.

Für die zum Überführen der Papierbahn von einem Stützgewebe auf eine andere dienende Vorrichtung, die wenigstens beiderseits der Papierbahn befindliche Gewebe, eine Saugeinrichtung zum Ablösen der Bahn vom ersten Gewebe, wobei die Bahn dann vom zweiten Gewebe getragen wird, und eine auf der zur Saugeinrichtung entgegengesetzten Seite der Bahn und der Gewebe befindliche Leitwalze umfasst, mit der jenes Gewebe, von dem die Bahn abgelöst wurde, weitertransportiert wird, ist charakteristisch, dass die besagte Saugeinrichtung aus einem Transfersaugkasten mit einem Deckel und einem oder mehreren Saugschlitzen oder einer oder mehreren Reihen diskreter Öffnungen quer zur Gewebelaufrichtung in diesem Deckel besteht und dieser Saugkasten so bei der Leitwalze angeordnet ist, dass einer der Schlitze des Deckels im Wesentlichen an jene Stelle der Leitwalze zu liegen kommt, an der die Walzenfläche von der Richtung des transfersaugkastenseitigen Gewebes weg zu divergieren beginnt, wobei sich mindestens einer der Schlitze oder eine der Reihe von Öffnungen unter dem zweiten Gewebe über eine Breite erstreckt, die größer ist als die Breite der auf dem Gewebe aufliegenden Bahn. Vorzugsweise ist der Schlitz oder die Reihe diskreter Öffnungen kürzer als die Breite des auf der Seite der Saugeinrichtung befindlichen Gewebes.For transferring the web from a backing to another serving device located on at least either side of the web, suction means for releasing the web from the first web, the web then being carried by the second web and one opposite to the sucker Side of the web and the fabric guide roller, with which the fabric from which the web has been peeled, is transported, it is characteristic that said suction means of a transfer suction box with a lid and one or more suction slots or one or more rows of discrete openings is transverse to the fabric erection in this cover and this suction box is arranged at the guide roller, that one of the slots of the lid is substantially at that point of the guide roller to lie where the roller surface starts to diverge away from the direction of the Übertragungsaugkastenseitigen tissue, wherein yourself at least one of the slots or one of the series of openings under the second fabric extends across a width greater than the width of the web resting on the fabric. Preferably, the slot or row of discrete openings is shorter than the width of the tissue located on the side of the suction means.

Für die Vorrichtung nach einer anderen bevorzugten Ausführungsform der Erfindung ist charakteristisch, dass sich einer der Schlitze des Deckels am Einlaufzwickel der Leitwalze befindet.It is characteristic of the device according to another preferred embodiment of the invention that one of the slots of the lid is located at the inlet gusset of the guide roller.

Die übrigen charakteristischen Merkmale der erfindungsgemäßen Vorrichtung zum Überführen der Papierbahn von einem Stützgewebe auf ein anderes gehen aus den Patentansprüchen hervor.The remaining characteristic features of the device according to the invention for transferring the paper web of a Support fabrics to another are apparent from the claims.

Im Folgenden wird die erfindungsgemäße Vorrichtung unter Bezugnahme auf die beigefügten Zeichnungen im Einzelnen beschrieben.In the following, the device according to the invention will be described in detail with reference to the accompanying drawings.

Es zeigen:

Fig. 1
eine zum Überführen der Papierbahn von einem Stützgewebe auf eine andere dienende Vorrichtung nach dem Stand der Technik;
Fig. 2
eine andere zum Überführen der Papierbahn von einem Stützgewebe auf eine andere dienende Vorrichtung nach dem Stand der Technik;
Fig. 3
die Allgemeinansicht einer einige bevorzugte Ausführungsformen der Erfindung aufweisenden Pressenpartie einer Papiermaschine;
Fig. 4
eine alternative Ausführung der Maschine aus Fig. 3;
Fig. 5
eine Vorrichtung zum Überführen der Papierbahn von einem Stützgewebe auf ein anderes nach einer ersten und einer zweiten bevorzugten Ausführungsform der Erfindung;
Fig. 6
eine Vorrichtung zum Überführen der Papierbahn von einem Stützgewebe auf ein anderes nach einer dritten und einer vierten bevorzugten Ausführungsform der Erfindung, und
Fig. 7
eine detailliertere Darstellung der Deckellösung der in der Vorrichtung nach einer bevorzugten Ausführungsform der Erfindung einzusetzenden Saugkastenlösung,
Fig. 8
eine Ansicht eines Abschnitts des Gewebes mit darauf gehaltener Bahn und einem Saugkasten mit einem Schlitz, und
Fig. 9
eine Seitenansicht eines Saugkastens mit einem Schlitz zur Verdeutlichung der Position des Schlitzes bezüglich der Leitwalze.
Show it:
Fig. 1
one for transferring the paper web from a support fabric to another serving device of the prior art;
Fig. 2
another for transferring the paper web from a backing fabric to another prior art device;
Fig. 3
the general view of a few preferred embodiments of the invention having press section of a paper machine;
Fig. 4
an alternative embodiment of the machine Fig. 3 ;
Fig. 5
a device for transferring the paper web from one support fabric to another according to a first and a second preferred embodiment of the invention;
Fig. 6
a device for transferring the paper web from one support fabric to another according to a third and a fourth preferred embodiment of the invention, and
Fig. 7
a more detailed illustration of the cover solution of the suction box solution to be used in the device according to a preferred embodiment of the invention,
Fig. 8
a view of a portion of the fabric with web held on it and a suction box with a slot, and
Fig. 9
a side view of a suction box with a slot to illustrate the position of the slot with respect to the guide roller.

Fig. 1 zeigt als Teilansicht eine dem Stand der Technik gemäße und in der US-Patentschrift 5,888,354 behandelte Papiermaschinen-Pressenpartie einschließlich der Vorrichtung zum Überführen der Papierbahn von einem Pressenpartieteil in den anderen. Die in der Zeichnung dargestellte Pressenpartie besteht aus einer ersten Presse 10 und einer zweiten Presse 20. Die erste Presse wird in der Zeichnung von der Schuhwalze 12 und ihrer Gegenwalze 14 gebildet, durch deren Nip die Papierbahn zwischen zwei Filzen 32 und 34 liegend in der Darstellung von links und rechts läuft. Der erste Filz 32 läuft als Schlaufe, innerhalb der sich die Schuhwalze 12 befindet, um die in diesem Fall verstellbare Filzleitwalze 16 und setzt seinen Weg nach oben fort. Der zweite Filz 34 wiederum läuft über die Gegenwalze 14. Die Papierbahn W wird mit Hilfe des Transfersaugkastens 18 auf der Strecke zwischen der Gegenwalze 14 und der Filzleitwalze 16 vom ersten Filz 32 abgelöst. Dabei wird der Sog des Saugkastens 18 durch den zweiten Filz 34 hindurch auf die Bahn W aufgebracht, um die Bahn vom ersten Filz 32 zu lösen. Da gleichzeitig die Laufrichtung des ersten Filzes 32 nicht mehr entlang des Deckels des Saugkastens 18 führt, sondern geringfügig höher verläuft, gelingt das Ablösen der Papierbahn W vom ersten Filz mühelos. Gleichzeitig sorgt der Sog des Saugkastens 18 auch dafür, dass die Papierbahn W am zweiten Filz 34 haften bleibt. Bei dieser Lösung wird der zweite Filz 34 mit Hilfe des Saugkastens 18 so angehoben, dass gewährleistet ist, dass der zweite Filz ständig mit dem Deckel des Saugkastens 18 in Kontakt bleibt, wodurch wiederum sichergestellt wird, dass auf die Papierbahn W ständig ein gleichmäßiger Sog wirkt, der die Bahn W zuverlässig am zweiten Filz 34 hält. Eine solche Verfahrensweise ist jedoch mit einer relativ hohen Verschleißbelastung des Saugkastendeckels verbunden, als deren Folge sich sowohl der Deckel als auch der Pressfilz schnell abnutzen. Dies ist besonders bei höheren Produktionsgeschwindigkeiten, z.B. über 1100 m/min der Fall. Fig. 1 shows a partial view of a prior art and in the U.S. Patent 5,888,354 treated paper machine press section including the device for transferring the paper web from one press part part into the other. The press section shown in the drawing consists of a first press 10 and a second press 20. The first press is formed in the drawing by the shoe roll 12 and its counter roll 14, by the nip of the paper web lying between two felts 32 and 34 in the illustration running from left and right. The first felt 32 runs as a loop, within which the shoe roll 12 is located, around the in this case adjustable felt guide roll 16 and continues its way upwards. The second felt 34 in turn passes over the counter-roller 14. The paper web W is detached by means of the transfer suction box 18 on the route between the counter-roller 14 and the felt-guiding roller 16 from the first felt 32. At this time, the suction of the suction box 18 is applied to the web W through the second felt 34 to release the web from the first felt 32. Since at the same time the running direction of the first felt 32 no longer leads along the lid of the suction box 18, but slightly runs higher, the detachment of the paper web W succeeds easily from the first felt. At the same time, the suction of the suction box 18 also ensures that the paper web W adheres to the second felt 34. In this solution, the second felt 34 is raised by means of the suction box 18 so as to ensure that the second felt is constantly in contact with the lid of the suction box 18, which in turn ensures that a uniform suction is constantly applied to the paper web W. that reliably holds the web W on the second felt 34. However, such a procedure is associated with a relatively high wear load of the suction box lid, as a result of which both the lid and the press felt wear out quickly. This is the case especially at higher production speeds, eg over 1100 m / min.

Die Papierbahn W wird, auf dem zweiten Filz 34 liegend, in den zweiten Teil 20 der Pressenpartie, d.h. in die zweite Presse geleitet, die in der Zeichnung durch den dritten Filz 22 und die Transfersaugwalze 24 repräsentiert ist. Die Transfersaugwalze 24 dient dazu, die Papierbahn vom zweiten Filz 34 der ersten Presse 10 abzuheben bevor dieser zweite Filz 34 über die Walze 26 nach unten geleitet wird. Im Prinzip löst die Saugwalze die Papierbahn vom zweiten Filz 34 auf die gleiche Weise ab wie vorangehend in Verbindung mit dem Transfersaugkasten 18 beschrieben wurde. Von der Saugwalze 24 unterstützt, transportiert der hier die zweite Presse 20 repräsentierende dritte Filz 22 die Papierbahn W weiter, bis der der zweiten Presse zugeordnete vierte Filz (nicht gezeigt) von unten hinzukommt, wobei die Papierbahn dann, nun wieder zwischen zwei Filzen befindlich, in den Nip der zweiten Presse und entsprechend eventuell noch in weitere folgende Nips geführt wird.The paper web W is, lying on the second felt 34, passed into the second part 20 of the press section, ie in the second press, which is represented in the drawing by the third felt 22 and the transfer suction roll 24. The transfer suction roll 24 serves to lift the paper web from the second felt 34 of the first press 10 before this second felt 34 is passed down the roll 26. In principle, the suction roll removes the paper web from the second felt 34 in the same manner as described above in connection with the transfer suction box 18. Supported by the suction roll 24, the third felt 22 here representing the second press 20 transports the paper web W until the fourth felt (not shown) assigned to the second press is added from below, the paper web then being again located between two felts. into the nip of the second press and possibly also in further following nips is performed.

In Fig. 2 ist eine völlig entsprechende und gleichfalls im US-Patent 5,888,354 behandelte Papiermaschinen-Pressenpartie gezeigt, wobei die gleichen Bezugszeichen auch die gleichen Bauteile bezeichnen. Der einzige Unterschied gegenüber der in Fig. 1 gezeigten Lösung besteht darin, dass der in Fig. 1 gezeigte Transfersaugkasten 18 nun durch die Saugwalze 18' ersetzt ist, mit der die völlig gleiche Funktion wie mit dem Saugkasten 18 erzielt wird. Bei dieser Lösung entfällt durch die drehende Saugwalze 18' das Problem der Filz- und der Saugkastendeckel-Abnutzung. Eliminiert wurde das besagte Problem allerdings durch eine Lösung, die kostspielig sowohl in der Anschaffung als auch im Betrieb und in der Wartung ist, denn die Saugwalze als rotierendes Element braucht im Vergleich zum Saugkasten zusätzlich zur Vakuumpumpe und den Rohrleitungen sowohl Lagerungen, stationäre Druckdichtungen zur Abdichtung der drehenden Walze, als auch einen Antrieb.In Fig. 2 is a completely equivalent and also in the U.S. Patent 5,888,354 treated paper machine press section, wherein the same reference numerals designate the same components. The only difference from in Fig. 1 The solution shown is that the in Fig. 1 shown transfer suction 18 is now replaced by the suction roller 18 ', with the completely same function as with the suction box 18 is achieved. In this solution eliminated by the rotating suction roller 18 'the problem of felt and the Saugkastendeckel wear. However, the problem has been eliminated by a solution that is costly to purchase and in operation and maintenance, because the suction roll as a rotating element needs in addition to the vacuum pump and the piping both bearings, stationary pressure seals for sealing compared to the suction box the rotating roller, as well as a drive.

Fig. 3 zeigt eine Allgemeinansicht einer Vorrichtung gemäß der Erfindung, d. h. eine bevorzugte Ausführungsform der Erfindung aufweisende Pressenpartie einer Papiermaschine. Die Pressenpartie in Fig. 3 besteht aus der um den ersten Pressnip 42 herum gebauten ersten Presse 40 und der um den zweiten Pressnip 62 herum gebauten zweiten Presse 60. Die Bahn W gelangt zum Beispiel, vom Sieb 44 getragen, aus der Siebpartie der Papiermaschine in die erste Presse 40. Vom Sieb 44 wird die Bahn, mit Hilfe des Transfersaugkastens 48 und der Leitwalze 50 auf den ersten Pressfilz 46 gebracht. Die vom ersten Pressfilz 46 gestützte Bahn W wird, zwischen dem besagten Filz 46 und dem Pressfilz 52 befindlich, in den Pressnip 42 geführt. Vom Nip 42 gelangt die Bahn, zwischen dem Filz 46 und dem Pressfilz 52 befindlich, zur Leitwalze 54, wo die Bahn mit Hilfe des auf der zur Leitwalze 54 entgegengesetzten Seite der Bahn befindlichen Transfersaugkastens 56 vom Pressfilz 52 abgelöst wird. Der Pressfilz 52 setzt seinen Weg nach unten fort, und die Bahn wird, vom Pressfilz 46 gestützt, zur zweiten Presse 60 geführt. In der zweiten Presse 60 wird die Bahn vor dem Pressnip 62 zuerst mit einem dritten Pressfilz 66 in Kontakt gebracht, danach mit Hilfe des Transfersaugkastens 68 vom Pressfilz 46 abgelöst und auf dem dritten Pressfilz 66abgelegt. Danach wird die Bahn, zwischen dem dritten Pressfilz 66 und dem ersten Transferband 72 befindlich, durch den zweiten Pressnip 62 geführt. Anschließend wird der Pressfilz 66 von der Bahn gelöst und an der Leitwalze 70 umgelenkt. Die Bahn hat eine große Adhäsion am Transferband 72, so dass sie dem Lauf des Transferbands 72 folgt. An einer Umlenkwalze 168 des Transferbands 72 wird die Bahn mit einem Trocken-Transferfilz 166 in Kontakt gebracht und mit Hilfe des Transfersaugkastens 169 auf dem Transferfilz 166 abgelegt. Dieser fördert die Bahn weiter in die Trockenpartie der Maschine. Fig. 3 shows a general view of a device according to the invention, ie, a preferred embodiment of the invention having press section of a paper machine. The press section in Fig. 3 consists of the first press 40 built around the first press nip 42 and the second press 60 built around the second press nip 62. The web W, for example, carried by the wire 44, passes from the wire section of the paper machine into the first press 40 Sieve 44, the web, using the transfer suction box 48 and the guide roller 50 is placed on the first press felt 46. The web W supported by the first press felt 46 is fed into the press nip 42 between said felt 46 and the press felt 52. From the nip 42, the web, located between the felt 46 and the press felt 52, passes to the guide roll 54, where the web is removed from the press felt 52 by means of the transfer suction box 56 located on the opposite side of the web from the guide roll 54. The press felt 52 continues its way down, and the web is guided by the press felt 46 to the second press 60. In the second press 60, the web is first brought into contact with a third press felt 66 before the press nip 62, then detached from the press felt 46 by means of the transfer suction box 68 and laid down on the third press felt 66. Thereafter, the web, between the third press felt 66 and the first transfer belt 72 located, passed through the second press nip 62. Subsequently, the press felt 66 is released from the web and deflected at the guide roller 70. The web has a large adhesion to the transfer belt 72 so as to follow the path of the transfer belt 72. At a deflection roller 168 of the transfer belt 72, the web is brought into contact with a dry transfer felt 166 and deposited on the transfer felt 166 by means of the transfer suction box 169. This conveys the web further into the dryer section of the machine.

Die Fig. 4 zeigt einen sehr ähnlichen Aufbau einer Pressenpartie einer Papiermaschine, wobei die gleichen Bezugszeichen wie in Fig. 3 für die Bezeichnung funktionsgleicher Teile verwendet werden. Abweichend von Fig. 3 wird hier die Bahn vom Transferband 72 mit Hilfe einer Saugwalze 170 auf den Trocken- oder Transferfilz 166 übertragen.The Fig. 4 shows a very similar construction of a press section of a paper machine, wherein the same reference numerals as in Fig. 3 be used for the designation of functionally identical parts. Deviating from Fig. 3 Here, the web is transferred from the transfer belt 72 by means of a suction roll 170 on the dry or transfer felt 166.

Bei der in Fig. 5 dargestellten, bevorzugten Ausführungsform der Erfindung folgenden Lösung zum Überführen der Papierbahn von der ersten Presse 40 der Papiermaschine in die zweite Presse 60 gelangt die Papierbahn, zwischen dem ersten Pressfilz 46 und dem zweiten Pressfilz 52 befindlich, von links kommend bis an die Filzleitwalze 54 der Pressvorrichtungen, die also zum Beispiel aus einer Schuhpresse oder einer Walzenpresse bestehen können. Auf der zur Leitwalze 54 entgegengesetzten Seite des Filzes 46 d.h. auf der Seite des zweiten Pressfilzes 52, ist bei der Walze 54 ein Transfersaugkasten 56 angeordnet, dessen Deckel 80 bei der gezeigten Ausführungsform zwei Schlitze 82 und 82 aufweist. Der in Bahnlaufrichtung betrachtet erste Schlitz 82 befindet sich bevorzugt genau bei der Leitwalze 54. Allerdings kann der Schlitz auch am Einlaufzwickel (in der Zeichnung links) oder, relativ zur Walze 54, an jener Stelle der Bahn, wo der erste Pressfilz 46, der Oberfläche der Walze 54 folgend, eine von der Richtung des zweiten Pressfilzes abweichende Richtung einschlägt, d.h. am Auslaufzwickel (rechts in der Zeichnung) angeordnet sein. Der erste Schlitz 82 kann an jener Ebene beginnen, die durch die Achsmittellinie der Leitwalze 54 und durch die Linie, an der sich die Papierbahn von dem der Leitwalze 54 zu folgen beginnenden Filz 46 löst, läuft. Weiter ist zu beachten, dass auch die Anzahl der Schlitze für deren Platzierung mitbestimmend ist. Mit anderen Worten, je mehr Schlitze vorhanden sind, desto weiter entfernt von der Leitwalzenstelle können sich die äußersten Schlitze befinden. Da die Oberfläche der Leitwalze 54 gerillt oder ansonsten so beschaffen ist, dass Luft an die Bahnabhebestelle strömen kann, vermag der Transfersaugkasten 56 die Papierbahn vom ersten, der Oberfläche der Leitwalze 54 folgenden Filz 46 abzulösen und an der Oberfläche des zweiten Pressfilzes 52 zu halten. Ein zweiter Schlitz im Deckel 80 des Transfersaugkastens 56 hinter der Ablösestelle dient dem Zweck, das Haften der Bahn am Gewebe 52 auch nach dem eigentlichen Ablösevorgang zu sichern; außerdem kann in der Filzführung die Bahn durch herkömmliche Vakuumkästen 58 bis zur Leitwalze 64 des dritten Pressfilzes 66 der zweiten Presse 60 am Gewebe 52 gehalten werden.At the in Fig. 5 illustrated, preferred embodiment of the invention following solution for transferring the paper web from the first press 40 of the paper machine in the second press 60 passes the paper web, located between the first press felt 46 and the second press felt 52, coming from the left to the felt guide roll 54 of the pressing devices that is to the Example may consist of a shoe press or a roller press. On the side of the felt 46 opposite to the guide roller 54, ie on the side of the second press felt 52, a transfer suction box 56 is arranged in the roller 54, the lid 80 of which has two slots 82 and 82 in the embodiment shown. The first slot 82 viewed in the direction of web travel is preferably located exactly at the guide roller 54. However, the slot may also be at the entry gusset (left in the drawing) or, relative to the roller 54, at the location of the web where the first press felt 46 is the surface following the roller 54, a direction that deviates from the direction of the second press felt, that is to say it is arranged on the outlet gusset (on the right in the drawing). The first slot 82 may begin at the plane passing through the axial centerline of the guide roller 54 and through the line at which the paper web is released from the felt 46 beginning to follow the guide roller 54. It should also be noted that the number of slots is also decisive for their placement. In other words, the more slots there are, the farther away from the guide roller location may be the outermost slots. Since the surface of the guide roll 54 is grooved or otherwise configured to allow air to flow to the web take-off position, the transfer suction box 56 is adapted to peel the paper web from the first felt 46 following the surface of the guide roll 54 and hold it against the surface of the second press felt 52. A second slot in the lid 80 of the transfer suction box 56 behind the release point serves the purpose of securing the adherence of the web to the fabric 52 even after the actual detachment operation; In addition, in the felt guide, the web can be held to the fabric 52 through conventional vacuum boxes 58 to the guide roll 64 of the third press felt 66 of the second press 60.

Wesentlich bei der Platzierung des Transfersaugkastens 56 nach der ersten Ausführungsform dieser Erfindung ist neben der Anordnung des ersten Schlitzes 82 des Saugkastendeckels 80 so, dass er spätestens im Wesentlichen an der Stelle, an der sich der Pressfilz 46 und die Papierbahn W voneinander trennen, beginnt, - bevorzugt befindet sich die Saugstelle an dem zuvor liegenden Einlaufzwickel -, auch, dass der Deckel 80 des Saugkastens 56 eben oder (in dem Fall, dass der Deckel der Form der Walzenoberfläche folgt) bevorzugt konkav gestaltet ist, und dass der Verlauf des Deckels 80 des Saugkastens 56 mit dem Verlauf des Gewebes 52 zusammenfällt. Mit anderen Worten, der Saugkastendeckel 80 bewirkt keinerlei Richtungsänderungen des Gewebes 52, sondern der Pressfilz 52 bewegt sich ab der Leitwalze 54 ab exakt in der durch die Leitwalze 64 der zweiten Presse 60 bestimmten Richtung.Essential to the placement of the transfer suction box 56 according to the first embodiment of this invention is in addition to the arrangement of the first slot 82 of the suction box lid 80 so that it begins at the latest substantially at the point where the press felt 46 and the paper web W separate from each other, - Preferably, the suction is located on the previous inlet gore -, also, that the lid 80 of the suction box 56 is flat or (in the case that the lid of the shape of the roll surface follows) is preferably concave, and that the course of the lid 80th of the suction box 56 coincides with the course of the fabric 52. In other words, the Saugkastendeckel 80 causes no directional changes of the fabric 52, but the press felt 52 moves from the guide roller 54 from exactly in the direction determined by the guide roller 64 of the second press 60 direction.

Rechts in Fig. 5 ist als eine zweite bevorzugte Ausführungsform der Erfindung auch gezeigt, wie die Bahn vom zweiten Pressfilz 52 abgelöst und zum Haften an dem dritten Pressfilz 66 gebracht wird. Dies geschieht in der Weise, dass innerhalb der zweiten Pressfilzschlaufe eine Leitwalze 70 angeordnet ist, um die der Pressfilz 52 geführt wird, während gleichzeitig der innerhalb der dritten Pressfilzschlaufe 66 bei der Leitwalze 70 angeordnete Transfersaugkasten 68 die Bahn vom Pressfilz 52 abhebt und auf den Pressfilz 66 überführt. In Fig. 5 hat der dieser zweiten Ausführungsform entsprechende Deckel 86 des Transfersaugkastens 68 nur einen Schlitz 88, wobei dieser Schlitz 88 in Bahnlaufrichtung an jener Stelle platziert sein muss, an der sich der Pressfilz 52 vom Pressfilz 66 trennt.Right in Fig. 5 As a second preferred embodiment of the invention, it is also shown how the web is detached from the second press felt 52 and brought to adhere to the third press felt 66. This is done by arranging within the second press felt loop a guide roll 70 around which the press felt 52 is guided, while at the same time the transfer suction box 68 located within the third press felt loop 66 at the guide roll 70 lifts the web from the press felt 52 and onto the press felt 66 transferred. In Fig. 5 the cover 86 of the transfer suction box 68 corresponding to this second embodiment has only one slot 88, this slot 88 having to be placed in the web running direction at the point where the press felt 52 separates from the press felt 66.

In Fig. 6 wiederum sind Transfersaugkasten-Lösungen nach einer dritten und vierten bevorzugten Ausführungsform der Erfindung bei der Überführung der Papierbahn vom ersten zum zweiten Pressnip der Papiermaschine gezeigt. Die Papierbahn, zwischen dem ersten Pressfilz 46 und dem zweiten Gewebe 52 befindlich, gelangt von links kommend bis an die Leitwalze 54. Auf der zur Leitwalze 54 entgegengesetzten Seite des Filzes 46, ist bei der Walze 54 auf der Seite des Gewebes 52 ein Transfersaugkasten 56 angeordnet, dessen Deckel 90 konkav geformt ist und bei der gezeigten Ausführungsform vier Schlitze 92, 94, 96 und 98 aufweist. Die Platzierung und das Funktionsprinzip der letzten beiden Schlitze 96 und 98 sind im Wesentlichen die gleichen wie die der Schlitze 82 und 82 der vorangehend beschriebenen Ausführungsform, d.h. sie dienen zum Ablösen der Bahn vom ersten Pressfilz 46 (Schlitz 96) und zum Halten der Bahn am Gewebe 52 (Schlitz 98). Die davor befindlichen Schlitze 92 und 94 liegen im Bereich des Einlaufzwickels der Leitwalze 54. Da in dem Einlaufzwickel Überdruck herrscht, dienen die in diesem Bereich befindlichen Schlitze dem Zweck, die Bahn vom ersten Pressfilz 46 bereits vor der Leitwalze 54 abzulösen. Durch den in den Schlitzen 92 und 94 herrschenden Sog wird der die Bahn vom Filz ablösende Differenzdruck verstärkt. Wie schon bei der vorangehend behandelten Ausführungsform, hat auch bei dieser Ausführungsform der Deckel 90 des Transfersaugkastens den gleichen Verlauf wie das Gewebe 52.In Fig. 6 Again, transfer suction box solutions according to a third and fourth preferred embodiment of the invention are shown in the transfer of the paper web from the first to the second press nip of the paper machine. The paper web, located between the first press felt 46 and the second fabric 52, arrives from the left as far as the guide roll 54. On the side of the felt 46 opposite the guide roll 54, a transfer suction box 56 is provided on the side of the fabric 52 in the roll 54 arranged, the lid 90 is concave-shaped and in the embodiment shown four slots 92, 94, 96 and 98 has. The placement and operating principle of the last two slots 96 and 98 are substantially the same as those of the slots 82 and 82 of the previously described embodiment, ie, they serve to release the web from the first press felt 46 (slot 96) and hold the web on the web Fabric 52 (slot 98). The slots 92 and 94 located in front are in the region of the inlet gusset of the guide roller 54. Since there is overpressure in the inlet gusset, the slots located in this area serve the purpose of detaching the web from the first press felt 46 before the guide roller 54. The suction prevailing in the slots 92 and 94 enhances the differential pressure exiting the web from the felt. As in the previously discussed embodiment, also in this embodiment, the lid 90 of the transfer suction box has the same course as the fabric 52.

Weiter ist in Fig. 6 das Überführen der Papierbahn vom zweiten Filz 52 auf den dritten Pressfilz 66 gezeigt. Dieser Vorgang beginnt mit dem Ablösen der Papierbahn vom zweiten Pressfilz 52. Der einzige Unterschied zu der in Fig. 5 gezeigten Ausführungsform besteht darin, dass der Deckel 100 des Transfersaugkastens 68 anders konstruiert ist. Bei der Ausführungsform in Fig. 6 hat der Deckel 100 zwei Schlitze 102 und 104, die so platziert sind, dass sich der erste Schlitz 102 im Bereich des Einlaufzwickels der Leitwalze 70 (also auf der Seite der einlaufenden Bahn) und der zweite Schlitz 104 im Bereich das Auslaufzwickels befindet. Mit anderen Worten, die Schlitze 102 und 104 dienen dem Zweck, die Bahn erst vom Pressfilz 52 abzulösen (102) und dann zum Haften an dem dritten Pressfilz 66 zu bringen (104). Bei der Übergabe einer Papierbahn von der Siebpartie in die Pressenpartie unter Verwendung der Erfindung zeigte eine Bahn mit einem Trockengehalt von um 16% einen guten Übergabeverlauf. Für die Übergabe der Bahn von der Pressenpartie in die Trockenpartie soll der Trockengehalt nicht unter 25% liegen.Next is in Fig. 6 the transfer of the paper web from the second felt 52 to the third press felt 66 is shown. This process begins with the detachment of the paper web from the second press felt 52. The only difference to the in Fig. 5 In the embodiment shown, the lid 100 of the transfer suction box 68 is designed differently is. In the embodiment in Fig. 6 For example, the lid 100 has two slots 102 and 104, which are positioned so that the first slot 102 is in the region of the inlet gusset of the guide roller 70 (ie on the side of the incoming web) and the second slot 104 in the region of the outlet gusset. In other words, the slits 102 and 104 serve the purpose of first releasing the web from the press felt 52 (102) and then adhering it to the third press felt 66 (104). When transferring a paper web from the wire section into the press section using the invention, a web having a dry content of 16% showed a good transfer history. For the transfer of the web from the press section to the dryer section, the dry content should not be below 25%.

Was die Konstruktion des Transfersaugkastens betrifft, so kann sie, abgesehen von der Deckelform, als herkömmlich bezeichnet werden. Die Breite der gewöhnlich ein bis fünf Schlitze 114 und 116 im Deckel 112 des in Fig. 7 gezeigten Kastens 110 liegt in der Größenordnung von 5-20 mm. Man hat festgestellt, dass sich bei größeren Schlitzbreiten der Filz in den Schlitz hineinbiegt, was sowohl zu Schlitz- als auch zu Filzverschleiß führt. Auch nimmt dann der Sogbedarf erheblich zu. Die Deckelleisten 118 bestehen bevorzugt aus keramischem Material und sind, um den Verschleiß der Leisten 118 und des Filzes zu minimieren, an ihren Kanten gerundet. In gewissen Fällen können auch Kunststoffleisten in Frage kommen. Die Leisten 118 sind in Halterungen 120 eingesetzt, die durch Formschlussverbindung an Gegenprofilen 122 des Saugkastens 110 befestigt sind, um die Leisten 118 leicht auswechseln zu können. Vorzugsweise sind die Leisten federnd gelagert, dies kann z. B. durch einen gasgefüllten Schlauch (nicht gezeigt) erreicht werden, der in Fig. 7 zwischen die Halterung 120 und das Gegenprofil 122 einzulegen wäre. Diese Federwirkung verhindert einen Schlag auf die Leisten, wenn plötzlich ein dickerer Papierklumpen zwischen den Saugkasten und die Leitwalze gerät, z. B. zwischen den Filzen liegt.As far as the construction of the transfer suction box is concerned, apart from the lid shape, it may be called conventional. The width of the usually one to five slots 114 and 116 in the lid 112 of the in Fig. 7 shown box 110 is on the order of 5-20 mm. It has been found that with larger slot widths the felt bends into the slot, resulting in both slot and felt wear. Also, then the Sogbedarf increases significantly. The cover strips 118 are preferably made of ceramic material and are rounded at their edges to minimize wear of the strips 118 and the felt. In certain cases, plastic strips can also be considered. The strips 118 are inserted into holders 120, which are fastened by means of a form-fitting connection to counter profiles 122 of the suction box 110 in order to be able to exchange the strips 118 easily. Preferably, the strips are resiliently mounted, this can, for. B. by a gas-filled tube (not shown) can be achieved in Fig. 7 between the Holder 120 and the counter-profile 122 would be inserted. This spring action prevents a shock on the strips when suddenly a thicker lump of paper between the suction box and the guide roller device, z. B. lies between the felts.

Um eine optimale gegenseitige Lage der Leitwalze und des ihr zugeordneten Transfersaugkastens in allen gezeigten Übergabestellen zu erzielen, ist entweder die Leitwalze oder der Kasten oder es sind möglicherweise beide Elemente verstellbar angeordnet. Die Fig. 8 zeigt eine Übergabestelle ähnlich der Übergabe zwischen Pressfilz 46 und Pressfilz 52 in Fig. 5, allerdings ist hier nur ein Schlitz 82 im Transfersaugkasten 56 gezeigt. Die Darstellung zeigt einen Blick von unten in Fig. 5, wobei Pressfilz 46 und Leitwalze 54 weggelassen wurden. In Fig. 8 ist deutlich gezeigt, dass der Pressfilz 52, der Schlitz 82 und die Bahn W eine in dieser Reihenfolge abnehmende Breite haben. Anders gesagt: der Filz ist breiter als der Schlitz und der Schlitz ist breiter als die Bahn. Durch diesen Aufbau wird erreicht, dass in einem Randbereich 200 beiderseits der Bahn W eine Luftschicht abgesaugt wird. Die Erfinder haben festgestellt, dass diese Vorgehensweise den Übergang der Bahn zusätzlich stabilisiert. Verschiebbare Seitenverschlüsse 182 erlauben es, die Breite des Schlitzes 82 einzustellen, um die Breite der abgesaugten Luftschicht einzustellen. Es hat sich ferner gezeigt, dass es vorteilhaft ist, wenn der seitliche Überstand des Pressfilzes 52 über den Schlitz 82 größer ist als der Überstand des Schlitzes 82 über die Bahn W. Anders gesagt, das Maß Y kann vorzugsweise größer sein als X in Fig. 8, die Erfindung funktioniert aber auch zufriedenstellend wenn X und Y ungefähr gleich sind. Wenn Y groß gegenüber X gewählt wird, hat dies vorteilhafte Auswirkungen auf Energieverbrauch und Gewebeverschleiß. Vorteilhafte Maße sind 5 bis 150 mm für X und insbesondere 40 bis 70 mm für X. Gute Ergebnisse wurden bei Werten von 100 bis 200 nun für den Wert Y erzielt.In order to achieve an optimal mutual position of the guide roller and its associated transfer suction box in all transfer points shown, either the guide roller or the box or it may be both elements arranged adjustable. The Fig. 8 shows a transfer point similar to the transfer between press felt 46 and press felt 52 in Fig. 5 however, only one slot 82 is shown in the transfer suction box 56 here. The illustration shows a view from below Fig. 5 with press felt 46 and guide roll 54 omitted. In Fig. 8 It is clearly shown that the press felt 52, the slit 82 and the web W have a decreasing width in this order. In other words, the felt is wider than the slot and the slot is wider than the track. As a result of this design, an air layer is extracted in an edge region 200 on both sides of the web W. The inventors have found that this approach additionally stabilizes the transition of the web. Slidable side shutters 182 allow the width of the slot 82 to be adjusted to adjust the width of the extracted air layer. It has further been shown that it is advantageous if the lateral projection of the press felt 52 over the slot 82 is greater than the projection of the slot 82 over the web W. In other words, the dimension Y may preferably be greater than X in Fig. 8 However, the invention also works satisfactorily when X and Y are about the same. If Y is chosen large compared to X. This has beneficial effects on energy consumption and tissue wear. Advantageous dimensions are 5 to 150 mm for X and in particular 40 to 70 mm for X. Good results have been achieved at values of 100 to 200 now for the value Y.

Es ist anzumerken, dass in allen Ausführungsformen der Übergabestellen der oder die Schlitze auch als eine oder mehrere sich in Querrichtung der Bahn (Breitenrichtung) erstreckende Reihe von diskreten Öffnungen ausgeführt werden können. Dabei sind die Öffnungen kreisrunde Löcher oder auch kurze Schlitze oder dergleichen.It should be noted that in all embodiments of the transfer sites, the slit (s) may also be implemented as one or more series of discrete openings extending in the transverse direction of the web (width direction). The openings are circular holes or short slots or the like.

Schließlich zeigt Fig. 9 eine schematische Seitenansicht einer Übergabestelle auf die die Erfindung angewandt ist. Deutlich ist hier die Lage des Schlitzes 82 mit Bezug zu einem Ablösepunkt P zu sehen, an dem die Richtungen der beiden Filze 46 und 52 voneinander abzuweichen beginnen. Gezeigt ist zudem eine gefederte Lagerung der den Schlitz 82 im Deckel des Saugkastens 56 begrenzenden Leisten 118. Wie schematisch angedeutet ist, ist ein vorzugsweise druckluftgefüllter Schlauch 180 vorgesehen, der die Leiste 118 trägt. Wenn ein Papierklumpen in den Spalt zwischen Leitwalze 54 und Saugkasten 56 eingetragen wird, können die Leisten 118 in Fig. 9 nach unten ausweichen und werden nicht beschädigt. Die Federung der Leisten kann auch durch Elastomere oder andere, z. B. metallische Federelemente erzielt werden. Fig. 9 zeigt ferner ein Maß Z, das zwischen dem Deckel des Saugkastens 56 (hier als Oberkante der Leisten 118 gezeigt) und dem die Bahn aufnehmenden Filz 52 eingestellt werden kann. Es hat sich gezeigt, dass gute Ergebnisse bei der Übertragung der Bahn erhalten werden, auch wenn ein Abstand (Maß Z) zwischen Saugkastendeckel und aufnehmendem Filz vorliegt. Gute Ergebnisse wurden bei Werten für Z im Bereich von 0,5 bis 5 mm und insbesondere im Bereich von 1 bis 3 mm erzielt. Im Übrigen arbeiten die beschriebenen Vorrichtungen bei Drücken im Saugkasten, die von 1 bis 40 kPa und insbesondere von 15 bis 35 kPa unter dem Umgebungsdruck liegen.Finally shows Fig. 9 a schematic side view of a transfer point to which the invention is applied. Clearly seen here is the position of the slot 82 with respect to a separation point P at which the directions of the two felts 46 and 52 begin to deviate from one another. Shown is also a spring-mounted storage of the slot 82 in the lid of the suction box 56 limiting strips 118. As indicated schematically, a preferably compressed air-filled hose 180 is provided which carries the bar 118. When a lump of paper is introduced into the gap between the guide roller 54 and the suction box 56, the strips 118 in Fig. 9 dodge down and are not damaged. The suspension of the strips can also by elastomers or other, for. B. metallic spring elements can be achieved. Fig. 9 also shows a dimension Z that can be adjusted between the lid of the suction box 56 (shown here as the upper edge of the strips 118) and the web-receiving felt 52. It has been found that good results are obtained in the transfer of the web, even if there is a distance (dimension Z) between the suction box lid and the receiving felt. Good results have been obtained for values of Z in the range of 0.5 to 5 mm and in particular in the range of 1 to 3 mm. Incidentally, the devices described operate at pressures in the suction box which are from 1 to 40 kPa and in particular from 15 to 35 kPa below the ambient pressure.

Zu den obigen Ausführungen sei angemerkt, dass die erfindungsgemäße Vorrichtung nicht nur zu dem hier exemplarisch beschriebenen Überführen der Bahn innerhalb der Pressenpartie, sondern auch in Verbindung mit anderen Bahnüberführungsstellen der Papiermaschine benutzt werden können. Weiter ist selbstverständlich, dass die Erfindung, auch wenn oben ausschließlich von Papiermaschinen die Rede war, ebenso gut in Verbindung mit Karton, Tissue- und Zellstoffmaschinen angewendet werden kann. So schließt also der Begriff "Papier" auch Karton als eine Untergruppe ein.With regard to the above statements, it should be noted that the device according to the invention can be used not only for the transfer of the web within the press section described here by way of example, but also in connection with other web transfer stations of the paper machine. It is further understood that although the invention has been referred to exclusively as paper machines above, the invention is equally applicable to carton, tissue and pulp machines. Thus, the term "paper" also includes cardboard as a subgroup.

Claims (13)

  1. Device for transferring a paper web from one supporting fabric to another, which comprises fabric (44, 46; 46, 52; 52, 66; 66, 72) located at least on both sides of the paper web (W), a suction device (48; 56; 68) with which the web (W) is detached from the first fabric (44, 46, 52, 66) and "stitched" to the second fabric, and a guide roll (50; 54; 70) which is arranged on the side of the web (W) and the fabric (44, 46, 52) opposite to the suction device (48; 56; 68) and with which that first fabric, from which the web (W) has been detached, is transported onward,
    the suction device comprising a first transfer suction box (48; 56; 68) which has a cover (80; 86; 90; 100; 112) with one or more suction slots (82, 84; 88; 92, 94, 96, 98; 102, 104; 114, 116) or one or more rows of discrete openings extending in the transverse direction of the paper web (W), and this transfer suction box being placed at the guide roll (50; 54; 70) such that one of the slots (82; 88; 96; 104; 116) or one of the rows of discrete openings in the cover (80; 86; 90; 100; 112) extending in the transverse direction of the paper web (W) comes to lie substantially at that point of the guide roll (50; 54; 70) at which the surface of the roll (50; 54; 70) begins to diverge away from the direction of the second fabric (46; 52; 66) located on the side of the transfer suction box (48; 56; 68),
    characterized in that
    at least one of the slots (82; 88; 96; 104; 106) or one of the rows of openings under the second fabric extends over a width which is greater than the width of the web (W) resting on the fabric (46; 52; 66).
  2. Device according to Claim 1,
    characterized in that
    the at least one slot (84; 98; 104) or the at least one row of discrete openings is shorter than the width of the fabric (46; 52; 66) located on the side of the suction device (48; 56; 68; 110).
  3. Device according to Claim 1 or 2,
    characterized in that
    the at least one slot (84; 98; 104) or the at least one row of discrete openings projects laterally beyond the edge of the web by 5 - 150 mm, preferably 40 - 70 mm, on each side of the web W.
  4. Device according to Claim 1, 2 or 3,
    characterized in that
    the second fabric protrudes by 100 to 200 mm beyond each end of the slot (84; 98; 104) or the row of discrete openings.
  5. Device according to Claim 1,
    characterized in that
    the cover (80; 86; 100) of the transfer suction box (56; 86; 100) is flat, i.e. straight.
  6. Device according to Claim 1,
    characterized in that
    the cover (90; 112) of the transfer suction box (90; 110) is shaped concavely.
  7. Device according to any one of Claims 1 to 6,
    characterized in that
    the cover (80) of the transfer suction box (56) has two slots (82, 84) or rows of discrete openings, of which the first slot (82), viewed in the fabric running direction, or the first row of discrete openings in the fabric running direction serves to detach the paper web (W) from the outer fabric (46), viewed outwards from the transfer suction box (56), and the second slot (84) or the second row of discrete openings serves to secure the adherence of the web (W) to the fabric (52) located on the side of the transfer suction box (56).
  8. Device according to any one of Claims 1 to 7,
    characterized in that
    the cover (90; 100) of the transfer suction box (56; 70) has at least two slots (92, 94, 96, 98; 102, 104) or rows of discrete openings, of which at least the first slot (92, 94; 102), viewed in the fabric running direction, or the first row of discrete openings in the fabric running direction is located in the region of the inlet pocket of the guide roll (54; 70).
  9. Device according to Claim 8,
    characterized in that
    the cover (90) of the transfer suction box (56) has a plurality of slots (92, 94) or rows of discrete openings arranged in the region of the inlet pocket of the guide roll (54).
  10. Device according to any one of Claims 1 to 9,
    characterized in that
    the course of the cover (80; 86; 90; 100; 112) of the transfer suction box (48; 56; 68) coincides with the course of the second fabric (46; 52; 66).
  11. Device according to any one of Claims 1 to 10,
    characterized in that
    the surface of the guide roll (50; 54; 70) is grooved.
  12. Device according to one of the preceding claims,
    characterized in that
    adjusting elements (182) are provided in order to adjust the effective length of the slots (82, 84) or the row of discrete openings in the width direction of the web.
  13. Paper machine having a device for transferring the paper web from one supporting fabric to another according to any one of Claims 1 to 12,
    characterized in that
    the said fabrics (46, 52, 66) are felts of a press section of the paper machine, and the transfer suction box (56, 68, 110) serves to transfer the web from a first press (40) to a second press of the press section (60).
EP07847207A 2007-11-19 2007-11-19 Device for transferring a paper web from a supporting fabric to another Active EP2217759B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2007/062512 WO2009065433A1 (en) 2007-11-19 2007-11-19 Method and device for transferring a paper web from a supporting woven fabric to another

Publications (2)

Publication Number Publication Date
EP2217759A1 EP2217759A1 (en) 2010-08-18
EP2217759B1 true EP2217759B1 (en) 2011-06-29

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EP07847207A Active EP2217759B1 (en) 2007-11-19 2007-11-19 Device for transferring a paper web from a supporting fabric to another

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EP (1) EP2217759B1 (en)
CN (1) CN101868578B (en)
AT (1) ATE514814T1 (en)
DE (1) DE102008043294A1 (en)
WO (1) WO2009065433A1 (en)

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Publication number Priority date Publication date Assignee Title
DE102007027270A1 (en) * 2007-06-11 2008-12-18 Voith Patent Gmbh Method and machine for producing a one-sided smooth paper web
FI122309B (en) * 2008-03-28 2011-11-30 Metso Paper Inc Method and apparatus for transferring one fibrous web from one backing cloth to another
DE102011082161A1 (en) * 2011-09-06 2013-03-07 Voith Patent Gmbh Press section of a machine for producing a fibrous web
DE102011082159A1 (en) * 2011-09-06 2013-03-07 Voith Patent Gmbh Device for transferring and stabilizing a fibrous web
AT514702B1 (en) * 2014-02-17 2015-03-15 Jud Ag Papiermaschinen Plant for conveying materials, products and the like with at least one self-contained conveyor belt
CN107558287A (en) * 2017-09-28 2018-01-09 浙江兰良实业有限公司 Transferring device on all-glass paper production line between processing and forming and drying manufacturing procedure

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Publication number Priority date Publication date Assignee Title
GB1530246A (en) 1976-04-14 1978-10-25 Valmet Oy Method of and means for detaching and conducting a paper web in a paper-making machine
FI60897C (en) * 1978-06-16 1982-04-13 Valmet Oy FOERFARANDE OCH ANORDNING I EN PAPPERSMASKIN FOER LOESGOERING AV BANAN FRAON EN FORMNINGSVIRA OCH FOER OEVERFOERING AV DENSAMMA TILL EN TILL PRESSPARTIET HOERANDE VAEVNAD
US4561938A (en) * 1984-02-17 1985-12-31 M/K Plank Corporation Forming roll apparatus
FI83103C (en) * 1987-06-30 1992-12-15 Tampella Oy Ab ANORDNING FOER ATT STYRA EN MELLAN VIRORNA GAOENDE BANA UPP PAO EN VIRA
FI110440B (en) 1996-04-04 2003-01-31 Metso Paper Inc Transferring the web from the last press nip in the paper machine to the next drying section
DE19644110A1 (en) * 1996-10-31 1998-05-07 Voith Sulzer Papiermasch Gmbh Suction box
FI965277A (en) * 1996-12-31 1998-07-01 Valmet Corp Suction box in a paper machine and procedure in the suction box of the paper machine
AU6448098A (en) * 1997-03-31 1998-10-22 Beloit Technologies, Inc. Apparatus for removing fluid from a fibrous web
DE10333525A1 (en) * 2003-07-23 2005-02-17 Voith Paper Patent Gmbh Paper/cardboard web transfer assembly, between a continuous fourdrinier and a blanket in a papermaking machine, has a vacuum applied to the fourdrinier to retain extracted water and a stronger vacuum at the blanket to hold the web

Also Published As

Publication number Publication date
CN101868578A (en) 2010-10-20
ATE514814T1 (en) 2011-07-15
WO2009065433A1 (en) 2009-05-28
DE102008043294A1 (en) 2009-05-20
CN101868578B (en) 2012-12-26
EP2217759A1 (en) 2010-08-18

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