EP0608533A1 - Procédé et dispositif pour la déshydratation d'une bande au moyen de presses - Google Patents

Procédé et dispositif pour la déshydratation d'une bande au moyen de presses Download PDF

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Publication number
EP0608533A1
EP0608533A1 EP93120063A EP93120063A EP0608533A1 EP 0608533 A1 EP0608533 A1 EP 0608533A1 EP 93120063 A EP93120063 A EP 93120063A EP 93120063 A EP93120063 A EP 93120063A EP 0608533 A1 EP0608533 A1 EP 0608533A1
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EP
European Patent Office
Prior art keywords
press
roll
web
point
arrangement according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP93120063A
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German (de)
English (en)
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EP0608533B1 (fr
Inventor
Christian Schiel
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JM Voith GmbH
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JM Voith GmbH
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Publication of EP0608533A1 publication Critical patent/EP0608533A1/fr
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Publication of EP0608533B1 publication Critical patent/EP0608533B1/fr
Anticipated expiration legal-status Critical
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    • 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
    • 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

Definitions

  • the invention relates to a method and a device for dewatering a fibrous web formed by means of one or more endless sieve belts, in particular in a papermaking machine, through which the web is guided in a (usually) horizontal machine direction.
  • Dewatering is carried out by passing the web successively through a plurality of press stations, an endless and water-absorbing porous press belt running through at least one of these press stations, preferably a so-called "felt belt” or "wet felt”.
  • the web is guided from press to press in such a way that it never has to run freely, so that it is always supported by a wire belt or by a felt belt or by the outer surface of a roller.
  • the web is dewatered using the method described in D1 or a similar method. Thereafter, the web is first passed between the wire belt on which the web is formed and a first felt belt supported by a take-off suction roll through a first press point, after which the web continues to run with the first felt belt.
  • the first felt belt supported by a suction press roll, then guides the web through two further press stations, after which it is passed through the smooth outer surface of a press roll through at least one further press station.
  • the paper web is transferred from the screen belt to the smooth outer surface of a first press roller in the first press point and then guided by this through further press points, namely through two felted and one without felting Pressing point. After the latter, the web is guided into a last felted press point by means of a further smooth press roll.
  • the arrangement is such that the web passes the last press point counter to the machine direction and must therefore first be continued behind this press point using the last felt belt.
  • rewetting of the web from this felt band (and thus a web dry content that is inadequate in practice) is to be expected.
  • the very large diameter of the first press roll relative to the diameter of the other press rolls is also unfavorable. For this and other reasons, the known device is not suitable for use in modern papermaking machines.
  • the web is again removed from a screen belt by means of a smooth press roll and passed through a felted press station.
  • This is designed as an extended and felted press nip in the web running direction by using a so-called shoe press roll, which has a flexible circumferential press jacket and a press shoe.
  • the press jacket comes into contact with the felt belt in the press nip.
  • Another fundamental difference between D2 and D3 is that the screen belt touches the underside of the web before and in the first press point in D2 (as is usually the case), in D3 on the other hand, the top of the web.
  • the web is formed in a twin-wire zone, behind which the web continues with the top wire in the upward direction.
  • a steam blower box and suction boxes are provided in front of the first press point for draining the web.
  • the known device is therefore not highly recommended, partly because of the need for expensive and high-quality frames (with the risk of mechanical vibrations), partly because of the hot air rising from the inlet into the dryer section and also because of all of these circumstances, making it difficult to operate and access during operation and from time to time the necessary work to replace rollers, sieve and felt belts.
  • Another disadvantage of the method described in D3 is that the web is drained only on one side. This results in the danger that the finished paper web has unequal properties on both sides (two-sidedness of the paper web).
  • Various wet press arrangements are described in D4 with a shoe press roll, the flexible circumferential press jacket of which has a smooth outer jacket surface which comes into direct contact with the paper web.
  • a radially movable press shoe (and a concave sliding surface) is supported on a stationary support body (or several press shoes of this type).
  • rigid strips with a convex sliding surface are provided.
  • the wet press arrangement described in D5 includes, inter alia, three press points arranged one behind the other, namely a felted, an unfelted and a last felted press point.
  • there is no shoe press unit ie all press rolls are normal pipe rolls (therefore insufficient drainage capacity).
  • a third and provided for smoothing the web (and therefore formed by two smooth outer surfaces) press point or it is ensured by the web guide according to the invention that the space required for such a third press point is available in any case. This ensures the required uniformity of surface quality on both sides of the web.
  • claims 2 and 5 provide that the web comes into direct contact with the flexible press jacket of at least one Schühpreßwalze. This results in the advantage of particularly high dewatering performance of the felted press point in question, because a normal press roll with relatively large recesses for transporting water can be arranged here within the felt loop. In contrast, in other designs of the invention, a shoe press roll with a relatively thin, flexible press jacket is arranged in the felt loop, which can only be provided with rather small recesses for transporting water.
  • Claims 2 and 3 and claim 5 relate to an important further aspect of the invention.
  • a pair of press rolls available which forms a felt-free press point (ie between two smooth outer surfaces, both of which come into direct contact with the web), one of the two press rolls being a "normal pipe roll” and the other a “shoe press roll”.
  • the latter has a bar that presses the tubular press jacket against the normal pipe roller.
  • the bar is radially displaceable relative to the stationary support body of the shoe press roll in order to be able to open and close the press point and to be able to vary the press force (if necessary during operation). Both press rolls can thus be rigidly supported on the foundation or frame.
  • the width of the press nip can be determined by the shape of the sliding surface of the bar, namely convex, flat or concave.
  • this pair of feltless press rolls is clearly superior to a pair of rolls consisting of two normal tube rolls (known e.g. from D2 or D5).
  • the order of the two press rolls (i.e. whether the web changes from the shoe press roll to the normal raw roll or vice versa) can be chosen arbitrarily.
  • the first-mentioned variant is preferred because the lateral surface of the second roller generally has to be harder than that of the first roller and because the flexible jacket of the shoe press roller cannot be as hard as desired; on the other hand, the roll cover of the normal tube roll can be made with any hardness.
  • the press roll pair described is - for the reasons explained above - also superior to a roll pair formed from two shoe press rolls (known from D6); because it is difficult (if at all possible) to produce two flexible press sleeves with sufficient surface hardness values.
  • the pair of press rolls is combined with other press rolls, in particular in order to form press nips which are used for intensive dewatering of the web.
  • the shoe press roll as known per se, has at least one radially movable and concave press shoe, which forms a felted, extended press nip with another press roll.
  • the tube roller, together with an additional press roller preferably a shoe press roller
  • the press rolls are at about the same height as the preceding section of the screen and the dryer section below; thus high-quality and vibration-prone frames are avoided; the machine is also easier to operate, namely at least predominantly from the machine floor. It is also possible that in the first dryer group or on the first dryer cylinder the bottom instead of the top of the web comes into cylinder contact, thereby ensuring easier removal of rejects. As already mentioned, it is particularly important that the web is guided more favorably through the second press station, so that space is gained for at least one further press station, including a third press station used to smooth the web.
  • a paper web 2 is brought up to a first press point 5 on a wire belt 1 (this touches the underside of the web) via a wire suction roll 3 with suction zone 4.
  • the screen 1 continues over a guide roller 6.
  • the paper web 2 is transferred to the smooth surface of the press roll 7 in the first press point 5 (in which the tensioned screen 1 partially wraps around the press roll 7).
  • the paper web which adheres to the roller 7 with its upper side, then passes into the second press point 8 between the roller 7 and a further press roller 9.
  • a press felt 10 (only partially shown) is passed through the press point 8. Its path before and after the press point 8 is determined by felt guide rollers 11.
  • Drainage and cleaning elements eg pipe suction
  • felt tensioning roller regulating roller, possibly other guide rollers; see FIG. 19 for this purpose.
  • the suction suction roll 3 is assigned a water collecting trough 12 with lateral outlet connections 13.
  • a third press point 14 between the smooth roller 7 and a further smooth roller 15 the paper web 2 adhering to the surface of the roller 7 is pressed again and thereby smoothed; it leaves this press point 14 in contact with the surface of the roller 15 and is removed from the roller 15 in front of a scraper 16, which can be done without the support of the web by train or draft-free by contact with a further (not shown) movable support surface, which the Lane 2 follows after peeling off roller 15 (for example a felt, a dryer fabric, a belt or a roller).
  • Roller 9 is drawn as a tube press roller with a stationary press shoe 17 with a concave pressing surface in the area of the press point 8, over which there is a layer of lubricant in a known manner, on which a flexible tubular press jacket 18 made of plastic slides.
  • the press shoe is radially movable in a known manner in order to be able to vary the press force acting in the press point 8.
  • press rolls of this type are referred to below as "shoe press rolls”.
  • the supporting parts such as frames, axles, bearings are not shown; however, see alia, that the press roll 15 (relative to the press roll 7) is movably mounted.
  • FIG. 2 shows a wet press arrangement similar to that of FIG. 1. The same parts are again identified by the same numbers.
  • the arrangement in FIG. 2 is expanded by additional components.
  • the pressure between screen 1 and roller 7 is generated not only by partially wrapping the tensioned screen 1, but also partially or entirely (as shown) by a pressure element 19.
  • This can be used as a rotating element Roll or be designed as a fixed bar.
  • the pressing element 19 can be moved and pressed radially against the roller 7.
  • press point 24 Between press point 14 and scraper 16 there is an additional press point 24 between a press roll 20 with press shoe 23 and circumferential flexible press jacket 25.
  • a press felt 21 is passed through guide press 22 through the press point 24.
  • the symmetrical dewatering of the web in the press point 8 on its underside into the press felt 10 - and in the press point 24 on its upper side in the press felt 21 - ensures minimal structural two-sidedness of the web.
  • roller 7 In the press point 14, little or no water can be removed from the web 2 because there is no water-absorbent felt there.
  • This press point serves to transfer the web 2 from the roller 7 to the roller 15 while smoothing the web.
  • the transfer of roller 7 to roller 15 is effected either by roller 15 having a harder surface than roller 7 and / or by moistening the surface of roller 15 e.g. by means of a doctor blade or a spray tube 26.
  • a water collecting trough (12 in FIG. 1) under the screen suction roller 3 is not shown in FIG. 2, but can be carried out.
  • the outer surface of the press sleeves 18 and / or 25 can be provided with fine recesses (e.g. blind bores) (symbolically represented by dashed lines).
  • the shoe press roll 20 can be replaced with a normal (e.g. grooved) pipe roll.
  • Figure 3 corresponds in detail to Figures 1 and 2, only the pressure element 19 is missing.
  • the first press point 5 is directly between the rollers 3 and 7 educated. Because of the large diameter of the rollers 3 and 7, pressing can already be carried out with considerable line force in this pressing point, so that the paper web 2 already reaches the second pressing point 8 with a higher dry content, which makes this pressing point 8 more efficient.
  • FIG. 4 largely corresponds to FIG. 3 in structure and function. Only the two press felts 10 and 21 loop around the press sleeves 18, 25 of the rolls 9 and 20 instead of additional guide rolls at the inlet to the press points 8 and 24.
  • the screen 1 is the bottom screen of a twin wire former.
  • the paper web 2 is fed between the lower wire 1 and the upper wire 27 to a wide mouth suction device 28 and, together with the wire 27, is deflected upward in an arc in the vacuum slot 29.
  • the fibers of the web 2 projecting loosely downward into the meshes of the screen 1 are pulled out of the screen 1 and lie flat against the paper web 2 by means of surface tension forces and vacuum action in the suction device 28.
  • the longer path of sieve 27 relative to sieve 1 causes the two sieves to shift in the running direction, so that the loose fibers in the renewed contact between sieve 1 and web 2 after suction cup 28 no longer fit into the same sieve mesh.
  • a higher paper dry content is already achieved at the first press point 5. This also reduces screen markings in web 2.
  • the top wire 27 runs back over guide roll 30 to the forming zone of the former.
  • the width of the slot 29 is preferably between 50 and 150 mm. Several slots over 40 mm wide can also be used.
  • Figures 5 and 6 show further alternatives to Figures 1 to 4, wherein the press roll 7 is a shoe press roll with press shoe 17, flexible press jacket 18 and jacket cleaning device 44.
  • the roller 9 has a normal tubular roller body. While with the Examples of Figures 1 to 4, the press jacket 18 may contain grooves 47 or blind bores (see FIG. 2) on its outer surface, it is designed in the installation position according to FIGS. 5 and 6 with a smooth outer surface. For this purpose, the outer surface of the roller 9 contains grooves or blind bores, symbolically represented in FIG. 5 by a dashed circle 47.
  • the pressing force to be applied in the pressing points 5 and / or 14 can be varied in that the flexible pressing jacket 18 is more or less bulged outwards with the aid of radially movable support strips 31, 38.
  • the movable bar 38 which cooperates with the normal tube roller 15, an adjustment of the (e.g. four, see Fig. 6) heavy rollers 7, 9, 15 and 20 is not necessary.
  • this aspect of the invention makes it possible for each of the two pairs of rollers 9 and 7 or 15 and 20 to be rigidly supported on machine frames, foundation plates or the like. Not a single roller has to be stored in swivel levers or the like, e.g. 20 at roller 15. Nevertheless (in Fig.
  • FIGS. 8, 11, 12, 15, 16, 18, 19 and 24 there are four pressing points 5, 8, 14 and 24, the pressing force being individually adjustable in each pressing point.
  • the sliding surface of the support strip 31 is convexly curved, the radius of curvature determining the degree of bulging of the press jacket 18.
  • the sliding surface of the support strip 38 can also be convexly curved; but also a flat or concave curved sliding surface (similar to the press shoe 17) is possible.
  • Figure 7 is an alternative to Figure 5, wherein the first press point 5 is located directly between the rollers 3 and 7. Because a higher line force is intended in the press point 5, the flexible press jacket 18 must in turn be supported in the area of the press point 5 by a press bar 31 (guided on the fixed support body of the roller 7, not shown).
  • the strip 31 is expediently designed to be movable radially against the roller 3 and to be able to be pressed against it.
  • a lubricant layer which is generated hydrostatically or hydrodynamically, ensures that the jacket 18 slides over the bar 31 with little friction.
  • the sliding surface thereof can in turn be convex, flat or concave. In the latter case, the curvature is adapted to the diameter of the roller 3.
  • Figure 8 is a further development of Fig. 6.
  • the paper web is smoothed on both sides.
  • the surface layer of the roller 33 is designed to be harder than that of the roller 15.
  • An additional effect of this difference in hardness occurs on the upper side of the paper web 2, which is structured more roughly by felt 21 a stronger smoothing effect than on the underside, so that the outgoing paper web 2 has largely equally good smoothness on both sides.
  • the web 2 continues via guide roller 35 to the dryer section.
  • a scraper 34 cleans the surface of the roller 33.
  • a scraper 16 can be assigned to the roller 15 if necessary.
  • the surface layer of the roller 15 is preferably harder than that of the press jacket 18.
  • the surface hardness on roller 15 is higher than on roller 7 and on roller 33 higher than on roller 15.
  • Moistening spray tubes 26 and 36 may be provided in front of the nips 14 and 32 to further facilitate transfer of the web to the desired roll surface.
  • a conveyor belt 37 that runs across the machine width is used to remove the scrap that can occur on the scraper 34.
  • the flexible press jacket 18 is in turn dented outward by supporting strips 31 and 38.
  • Figure 9 corresponds to the wet press arrangement according to Figure 8. Only the roller 7 is designed here as a normal tube roller and roller 9 as a shoe press roller with a flexible jacket. Instead of a conveyor belt 37 below the scraper 34, there is only a collecting trough 39 here.
  • FIG. 10 is a further alternative to FIGS. 1 and 5.
  • the rollers 7 and 15 are shoe press rolls with flexible, smooth, tubular press sleeves 18 and 40.
  • Shoe press roll 7 has a press shoe 17 with a concave sliding surface.
  • Shoe press roll 15 does not yet have such a press shoe because it does not yet form a felted dewatering press nip.
  • It has a support bar 41 and 42 only at the pressing point 14 and opposite the blade of the scraper 16. All the support bars 31, 38, 41, 42 can optionally be rigid or radially movable. Of the two cooperating support strips 38 and 41, usually only one is movable.
  • the width of the press nip 14 can in turn be determined by the shape of the sliding surfaces (convex with any radius or even).
  • one support strip e.g. 38
  • the other (41) it is also possible for one support strip (e.g. 38) to be concave and the other (41) to be convex.
  • the schematically indicated support body 40A of the roller 15 has a recess 40B for a press shoe 25, if such should be retrofitted together with rollers 20, 22 and felt 21 (see FIG. 11).
  • FIG. 11 is an alternative to FIG. 9, the rollers 7 and 15 being designed as shoe press rollers, as in FIG. 10 but the rollers 9 and 20 as normal tube rollers.
  • FIG. 12 is another possible variant of FIGS. 8, 9 and 11, roller 7 being a normal tube roller compared to FIG. 11 and roller 9 being a shoe press roller with a flexible circumferential press jacket 18. Below the scraper 34 there is a reject suction nozzle 43.
  • roller 33 is harder than press jacket 40, and this is harder than roller 7.
  • the shoe press roller 9 can be replaced by a normal, for example grooved tube roller, namely if a relatively low drainage capacity is sufficient at the pressing point 8.
  • a paper web 2 is fed with a top wire 1 (the upper side of the web is touched by the wire) via a wire suction roll 3 with suction zone 4 to a first pressing point 5, which is arranged only a short distance above the wire suction roll 3.
  • the screen continues from here via a guide roller 6.
  • the paper web 2 is transferred in the first press point 5 to the smooth surface of the press roll 7 and, with its underside adhering to the roll 7, reaches the second press zone 8 between the roll 7 and a further press roll 9.
  • a Press felt 10 (only partially shown) passed through the press point 8. Before and after the pressing point, the felt 10 runs over guide rollers 11. The rest of the endless felt loop along with the usual associated components is not shown.
  • the suction suction roll 3 is assigned a water collecting trough 12 with two lateral outlet connections 13.
  • the roller 6 can be moved horizontally to open and close the press point 5 - and to vary the contact distance of the screen 1 on the press roll 7 - as indicated by a double arrow.
  • the circumference of the roller 7 is cleaned by a scraper 46.
  • the sieve 1 runs in Difference from Figures 1-12 counterclockwise by (arrows).
  • the direction of travel of the felt 10 through the pressing point 8 deviates only slightly from the horizontal. Therefore, a dryer fabric roller 54 can be arranged directly next to the roller 7, over which a dryer fabric 53 runs. This transports the web 2 in a known manner to a first drying cylinder 57, which contacts the underside of the web, and via further rollers and cylinders, of which only the roller 58 is visible.
  • FIG. 14 the wet press arrangement of FIG. 13 is expanded by a further feltless press point 14, in which the roller 15 pressed against the paper web 2 is used to smooth the top of the paper web 2, which has become rough due to the felt 10.
  • Scraper 46 on roller 7 can be omitted in some cases. Scrap material accumulating on the scraper 16 is transported laterally out of the machine by the conveyor belt 37.
  • a second shoe press roll 20 with felt 21 is added.
  • roller 7 is a shoe press roller and roller 9 is a normal tube roller.
  • Radially movable support strips 31 and 38 transmit the pressing forces in the pressing points 5 and 14 to the flexible jacket 18 of roller 7.
  • FIG. 16 in comparison to the arrangement in FIG. 15, a further press roll 33 with a hard, smooth surface is provided.
  • the upper side of the paper web 2 roughened by the felt 10 is smoothed in the pressing point 32.
  • the hardness of the outer layers of the rolls increases in the running direction from roll 7 via roll 15 to roll 33.
  • roller 20 is not a shoe press roller; the third press zone 24 is therefore not an extended press zone in this example.
  • a moistening spray tube 36 additionally ensures the transfer of the web from the press roll 15 on the press roller 33.
  • Roller cleaning devices 44 are provided for the continuous or discontinuous cleaning of the rollers 7 and 15. The scraping material accumulating on the scraper 34 falls down, for example into a reject chest.
  • roller 7 is a rigid tube roller and roller 9 is a shoe press roller.
  • roller 20 is also a shoe press roller; in this roller as well as in principle in every roller lying in a felt, the outer surface in contact with the felt can be provided with grooves or blind bores (as shown at 47, FIG. 16).
  • Figure 18 is another alternative to Figures 16 and 17, in which the two rolls 7 and 15 are shoe press rolls.
  • the paper web 2 is guided around a suction roll 3 with suction zone 4 into a first press point 5 between roll 3 and roll 7.
  • the belt 1 runs over the guide roller 6, while the paper web 2 continues on the outer surface of the press jacket 18 of the shoe press roller 7 to a second press point 8.
  • the pressing force in the first pressing point 5 is exerted by a pressure bar 31 (which is radially displaceable in the stationary support body of the roller 7, not shown).
  • the press point 8 is formed by the pressure shoe 17, which is also radially displaceable and presses on the paper web 2 from one side via a lubricating film and press jacket 18, and by counter-roller 9 which presses on the press felt 10 from the other side presses on the paper web.
  • the press felt 10 runs over guide, regulating and tensioning rollers 11, 48 and 52 back to the press inlet on the roller 9.
  • the roller 48 has a scraper 49.
  • a spray tube 50 is used for washing the felt 10, and for removing the press and wash water Pipe suction device 51.
  • An additional supplementary press point 8 'identical to the second press point 8' is provided with exactly the same elements as the press point 8, which are identified by the "dash" in the numbering.
  • This supplementary press point is an option for paper webs that are difficult to drain.
  • the web passes from the press point 8 'into the ("third") press point 14 between the rollers 7 and 15 and adheres to the surface of the roller 15 in another (“fourth") press point 24 between the rollers 15 and 20.
  • the web 2 is pressed by a press shoe 23 over a lubricating film, press jacket 25 and felt 21 onto the press roll 15 and continues on its surface to a detachment point "A", from which it is sucked onto the dryer fabric 53 .
  • This is done by means of the suction zone 55 of the suction guide roller 54.
  • a further suction device 56 can be installed in order to prevent the web 2 from detaching from the drying wire on the route from the suction guide roller 54 to the first drying cylinder 57. From the first drying cylinder 57, the paper web 2 passes together with the drying wire 53 via a drying wire guide roller 58 to the second drying cylinder 57A etc.
  • the press felt 21 is detached from the paper web 2 behind the press point 24, via a guide roller 22 to a doctor roller 60 and further via a tension roller 64, regulating roller 65 and another guide roller 22 to get back to the press point 24.
  • the scraper roller 60 is cleaned by a scraper 61, the felt 21 by the spray tube 62. Splash water and press water are sucked off by means of pipe suction 63.
  • a paper web 2 is guided on a belt 1 over roller 3 into a first press point 5 between belt 1 and the smooth pressing surface of roller 7.
  • Volume 1 there delivers the paper web 2 to the roller 7 and runs over roller 6 to further process stations, not shown, in order to finally return again with a web 2 in the direction of roller 3.
  • the second press point 8 is formed between the rollers 7 and 9.
  • a press shoe 17 presses the press jacket 18 and a felt 10 against the paper web 2 supported by the roller 7.
  • the felt 10 detaches after the press point 8 from the paper web 2 and overflows Guide roller 11 downwards. He returns from the bottom left with the jacket 18 to the press point 8.
  • the press point 5 By pressing the guide roller 6 horizontally to the right, the press point 5 is closed (operating position); by moving the guide roller 6 to the left, it can be opened.
  • stands 66 On both sides of the machine, stands 66 carry a bearing block 69, on which the roll neck 70 of the press roll 7 is supported, via removable intermediate pieces 67 and brackets 68.
  • the bearing pin 70 either rotates with the roller 7 or is stationary when roller 7 is a deflection compensation roller.
  • the stands 66 stand on foundation plates or supports 71.
  • a press 73 with pivot bolts 74 is attached to both sides of the machine on press frames 72 which are only shown as a partial piece.
  • the press lever 75 is pivotally attached, which holds the roller bearing 78 in which the axis 79 of the press roll 15 is mounted.
  • a sprue 80 of the bearing housing 78 has bearing bores 81 for the pivot pins of the scraper 16 and 82 for articulating the piston rod of the hydraulic cylinder 83.
  • the hydraulic cylinder 83 is connected to the bearing block 69 via a bearing bracket 84. With one on the driver's side and drive side of the machine mounted hydraulic cylinder 83, the press roll 15 is either swiveled to the right of the press roll 7 or pressed to the left (operating position).
  • a pair of rollers 85, 86 is also shown in FIG. 20 at the top left, over which an endless smooth belt 87 rotates at approximately the same speed as belt 1.
  • the tape 87 is pressed by the roller 85 onto an edge strip sprayed off from the paper web to be processed further by means of the water nozzle 76 and carries it away with it to the roller 86, on the circumference of which a scraper 88 scrapes the edge strip 99 into a collecting trough 89.
  • Dilution water from a nozzle arrangement 90 rinses the edge strip out of the tub 89 through a lateral outlet connection 91.
  • a moistening spray tube 92 moistens the tape surface in the return.
  • edge strips can also be held at the press point 5 by a suction pad 105 with a vacuum connection 105 ', so that they continue to run with the belt 1, while the center of the web runs along with the surface of the roller 7.
  • edge strip removal is by scraping off the surface of the roller 7 by means of edge scrapers 103.
  • FIG. 21 shows another arrangement, in which a screen 1 feeds a paper web 2 over a roller 3 from bottom to top to a first press point 5 and continues via guide roller 6.
  • the paper web 2 reaches the circumference of the roller 7 through the press point 8 and is detached from the roller 7 in front of the scraper 46.
  • Felt 10 runs through the press point 8 and continues via guide roller 11.
  • a roller 93 is pressed against the edge strip 99 of the web 2 and lifts it off the screen 1. Edge strip parts which are not thrown off the roller 93 by centrifugal force are scraped off by a scraper 94.
  • Roller 93 rotates about axis 95 and is synchronized with the speed of the screen 1 Peripheral speed driven (Fig. 21 and 22).
  • edge strip 99 is sprayed out of the sieve by a spray pipe 98. Partitions or better still suction pad 96 ensure that the edges of the web to be continued are also not detached from the screen by the spray water of the spray tube 98.
  • the suction box 96 is evacuated via line 97.
  • edge strip 99 shows in cross section the screen 1 and the web 2 adhering to it, as well as the edge strip 99 separated from it.
  • edge strips 99 usually become thinner and weaker towards the outermost edge and would cause web breaks if they were not would cut off from lane 2 in time.
  • the edge strip 99 comes with the surface of the roller 93 to the scraper 94.
  • the axis of the roller 93 is slightly inclined, the roller 93 is pressed against the resilient screen 1.
  • the roller 93 can alternatively be designed with a conical outer surface instead of a cylindrical one (truncated cone).
  • FIG. 23 section XXIII of FIG. 21
  • the web 2 and the severed edge strip 99 hang on the screen 1.
  • the edge of the paper web 2 is held by the edge suction device 96 with suction nozzle 97, through which air is extracted.
  • a spray pipe 98 with nozzles 98 ' is fed with pressurized water. The water emerging from the nozzles is sprayed onto the screen 1 and detaches the edge strip 99 from the latter.
  • a paper web 2 hanging on a porous belt, reaches the suction roll 3 with suction zones 4 and 4 'and is transferred to the circumference of the shoe press roll 7 in the first press point 5.
  • Volume 1 runs over guide, tensioning and regulating rollers 6, 100 and 102 to a take-off suction roller 104, which draws the paper web 2 over from a web forming screen 101 onto the belt 1.
  • Band 1 is cleaned by spray tube 106 and sucked through slot suction device 107.
  • Band 1 can be a sieve (press sieve) or needle felt or the like.
  • the paper web 2 runs with the smooth surface of the press cover 18 of the roll 7 through a third press point 14 (on a further radially movable bar 38) and from here with the smooth surface of the normal tube roller 15 by a fourth pressing point 24, which is formed between the rollers 15 and 20.
  • the web 2 is detached from the surface of the roller 15 and fed to the subsequent treatment units.
  • a scraper 16 with a collecting trough 39 cleans the surface of the roller 15.
  • the paper web is pressed against the roller 15 by means of the shoe press roller 20, namely by means of a radially movable press shoe 23 via the flexible press jacket 25 and the press felt 21, which is guided over guide rollers 22.
  • the press shoe 23 is supported on a stationary support body, from which a pin 111 is visible.
  • the bearing blocks 110 supporting the two pins 109 of the press roll 9 are connected via intermediate pieces 112 to a stationary cross member 113 which is part of a (for the sake of Clarity is not shown) press frame.
  • the bearing blocks 115 holding the pins 114 of the stationary support body of the roller 7 are connected to the bearing blocks 110 by means of tie rods 116. When changing the felt, roller or jacket, the tie rods 116 can be removed or their length interrupted.
  • Base plates 118 rest on foundation plates or machine substructures 117, and intermediate pieces 119 rest on them.
  • Bearing blocks 120 rest on them, in which the already mentioned pins 111 of the roller 20 are mounted.
  • the pins 122 of the roller 15 are mounted in bearing blocks 121 and these are in turn connected to the bearing blocks 120 by means of removable tie rods 123.
  • each of the two pairs of rollers 7, 9 and 15, 20 is supported in immobile bearing blocks 110/115 and 120/122; i.e. a movable roller bearing (similar to that of Fig. 20) is unnecessary.
  • the result is an extremely compact press section, with two felted, high-capacity dewatering presses, namely with the second press 8 for dewatering one side of the web, and with the fourth press 24 for dewatering the other side of the web, and in between with the feltless third press 14 for smoothing and turning the web.
  • the smooth tube roll 15 with an additional (not shown) smooth tube roller can form a final press nip for a further smoothing of the web, in order to achieve the highest web quality.

Landscapes

  • Paper (AREA)
  • Drying Of Solid Materials (AREA)
EP93120063A 1993-01-23 1993-12-13 Procédé et dispositif pour la déshydratation d'une bande au moyen de presses Expired - Lifetime EP0608533B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4301750 1993-01-23
DE4301750A DE4301750C2 (de) 1993-01-23 1993-01-23 Verfahren und Vorrichtung zum Entwässern einer Bahn mittels Pressen

Publications (2)

Publication Number Publication Date
EP0608533A1 true EP0608533A1 (fr) 1994-08-03
EP0608533B1 EP0608533B1 (fr) 1997-11-19

Family

ID=6478759

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93120063A Expired - Lifetime EP0608533B1 (fr) 1993-01-23 1993-12-13 Procédé et dispositif pour la déshydratation d'une bande au moyen de presses

Country Status (7)

Country Link
US (2) US5520782A (fr)
EP (1) EP0608533B1 (fr)
JP (1) JPH07197393A (fr)
AT (1) ATE160396T1 (fr)
CA (1) CA2113849C (fr)
DE (2) DE4301750C2 (fr)
FI (1) FI940319A (fr)

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DE19540898A1 (de) * 1995-11-02 1997-05-07 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zur Behandlung einer Faserstoff- oder Papierbahn in einer Preßvorrichtung
US5690791A (en) * 1995-02-02 1997-11-25 Valmet Corporation Press section with an equalizing nip in a paper machine
DE19652018A1 (de) * 1996-12-13 1998-06-18 Voith Sulzer Papiermasch Gmbh Pressenpartie
US5810974A (en) * 1995-10-20 1998-09-22 Valmet Corporation Press section including an extended-nip press with an internally heated center roll
WO2017129308A1 (fr) * 2016-01-29 2017-08-03 Voith Patent Gmbh Section de presses

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FI98843C (fi) * 1995-10-03 1997-08-25 Valmet Corp Menetelmä ja laite veden poistamiseksi paperi- tai kartonkiradasta puristamalla
US5749157A (en) * 1995-12-22 1998-05-12 Voith Sulzer Papiermaschinen Gmbh Dryer section for an apparatus for the production of a paper web
DE19605959C1 (de) * 1996-02-17 1997-09-11 Voith Sulzer Papiermasch Gmbh Vorrichtung zum oszillierenden Linearantrieb eines Bauteils innerhalb einer Bahnherstellungsmaschine
DE19613390A1 (de) * 1996-04-03 1997-10-09 Voith Sulzer Papiermasch Gmbh Walzenpresse
DE19615226A1 (de) * 1996-04-18 1997-10-23 Voith Sulzer Papiermasch Gmbh Trockenpartie
DE19642046A1 (de) * 1996-10-11 1998-04-16 Voith Sulzer Papiermasch Gmbh Pressenpartie
DE19705030A1 (de) * 1996-12-23 1998-06-25 Voith Sulzer Papiermasch Gmbh Vorrichtung und Verfahren zur Entwässerung einer Materialbahn
DE19654198A1 (de) * 1996-12-23 1998-06-25 Voith Sulzer Papiermasch Gmbh Maschine zur Herstellung einer Faserstoffbahn
EP0870866B1 (fr) 1996-12-23 2003-05-07 Voith Paper Patent GmbH Appareil et procédé pour la déshumidification d'une bande
DE19654201A1 (de) * 1996-12-23 1998-06-25 Voith Sulzer Papiermasch Gmbh Pressenpartie
DE19702574A1 (de) 1997-01-24 1998-07-30 Voith Sulzer Papiermasch Gmbh Pressenanordnung
DE19705360A1 (de) * 1997-02-12 1998-08-13 Voith Sulzer Papiermasch Gmbh Preßvorrichtung zum Entwässern oder Glätten einer Faserstoffbahn
DE19708966A1 (de) * 1997-03-05 1998-09-10 Voith Sulzer Papiermasch Gmbh Pressenanordnung
FI111470B (fi) * 1997-04-02 2003-07-31 Metso Paper Inc Menetelmä ja laite veden poistamiseksi paperi- tai kartonkirainasta sekä rainan viemiseksi puristinosaan
DE19724218A1 (de) * 1997-06-09 1998-12-10 Voith Sulzer Papiermasch Gmbh Pressenpartie
DE19744341A1 (de) 1997-10-07 1999-04-15 Voith Sulzer Papiertech Patent Papiermaschine
WO1999037854A1 (fr) * 1998-01-27 1999-07-29 Beloit Technologies, Inc. Dispositif presse
JPH11293583A (ja) * 1998-04-10 1999-10-26 Mitsubishi Heavy Ind Ltd 多孔質ウェブの連続乾燥装置
DE19962706A1 (de) * 1999-12-23 2001-06-28 Voith Paper Patent Gmbh Pressenpartie
DE19963696A1 (de) * 1999-12-29 2001-07-05 Voith Paper Patent Gmbh Pressenpartie
EP1158092B1 (fr) * 2000-05-24 2006-09-06 Voith Paper Patent GmbH Section de séchage
AU2002321192A1 (en) * 2001-07-19 2003-03-03 Mitsubishi Hitec Paper Flensburg Gmbh Press assembly
DE10239906A1 (de) * 2002-08-30 2004-03-18 Voith Paper Patent Gmbh Naßpressenanordnung
DE10311147A1 (de) * 2003-03-14 2004-10-14 Voith Paper Patent Gmbh Pressanordnung
US7166195B2 (en) * 2003-07-15 2007-01-23 Albany International Corp. Grooved and perforated layer for use in papermakers' fabric
AT412731B (de) * 2003-08-26 2005-06-27 Andritz Ag Maschf Vorrichtung zum trocknen einer papierbahn
US20070018364A1 (en) * 2005-07-20 2007-01-25 Pierre Riviere Modification of nonwovens in intelligent nips
FI20065198A (fi) 2006-03-27 2007-09-28 Metso Paper Inc Laitteisto ja menetelmä kudoksen kunnostamiseksi rainanmuodostuskoneessa
US7597782B2 (en) * 2006-10-11 2009-10-06 Dubois Chemicals, Inc. Press stable method of cleaning paper machine press fabrics on-the-run
FI20075452L (fi) * 2007-06-15 2008-12-16 Upm Kymmene Corp Menetelmä ja laitteisto paperin valmistamiseksi
ATE520820T1 (de) * 2007-12-20 2011-09-15 Stora Enso Oyj Anordnung für die pressenpartie einer maschine zur herstellung einer materialbahn und in einer solchen anordnung hergestellter karton oder papier
EP2342380A4 (fr) * 2008-05-28 2012-04-11 Metso Paper Inc Presse à toile double et procédé d'élimination de l'eau contenue dans une suspension de fibres
AT508331B1 (de) * 2009-05-19 2011-05-15 Andritz Ag Maschf Verfahren und vorrichtung zur behandlung einer faserstoffbahn in einer langnip-presseinheit
SE538098C2 (sv) 2013-11-14 2016-03-01 Valmet Aktiebolag En långnypsvals med ett stödelement för behandling av en fiberbana
WO2020106193A1 (fr) * 2018-11-19 2020-05-28 Valmet Aktiebolag Section de séchage d'une machine à papier comprenant au moins un cylindre de séchage à l'air traversant

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US4556451A (en) * 1980-12-18 1985-12-03 Beloit Corporation Method of and apparatus for substantially equal compacting and dewatering of both faces of freshly felted paper web
DE3729723A1 (de) * 1986-09-12 1988-03-17 Valmet Oy Geschlossene und kompakte pressenpartie einer papiermaschine
DE3831429A1 (de) * 1987-09-15 1989-03-23 Tampella Oy Ab Pressenpartie in einer papiermaschine
GB2218122A (en) * 1988-05-05 1989-11-08 Voith Gmbh J M Extended nip press arrangement
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DE9206340U1 (fr) * 1991-08-10 1992-08-13 Sulzer-Escher Wyss Gmbh, 7980 Ravensburg, De
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Publication number Priority date Publication date Assignee Title
US5690791A (en) * 1995-02-02 1997-11-25 Valmet Corporation Press section with an equalizing nip in a paper machine
US5849156A (en) * 1995-02-02 1998-12-15 Valmet Corporation Press section with an equalizing nip in a paper machine
DE19603640B4 (de) * 1995-02-02 2006-07-20 Metso Paper, Inc. Pressenpartie einer Papiermaschine
US5810974A (en) * 1995-10-20 1998-09-22 Valmet Corporation Press section including an extended-nip press with an internally heated center roll
DE19540898A1 (de) * 1995-11-02 1997-05-07 Voith Sulzer Papiermasch Gmbh Verfahren und Vorrichtung zur Behandlung einer Faserstoff- oder Papierbahn in einer Preßvorrichtung
DE19652018A1 (de) * 1996-12-13 1998-06-18 Voith Sulzer Papiermasch Gmbh Pressenpartie
US6210530B1 (en) 1996-12-13 2001-04-03 Voith Sulzer Papiermaschinen Gmbh Press section and method for pressing with different shoe press lengths
WO2017129308A1 (fr) * 2016-01-29 2017-08-03 Voith Patent Gmbh Section de presses

Also Published As

Publication number Publication date
DE59306036D1 (de) 1997-05-07
DE4301750C2 (de) 1996-10-10
EP0608533B1 (fr) 1997-11-19
FI940319A0 (fi) 1994-01-21
JPH07197393A (ja) 1995-08-01
ATE160396T1 (de) 1997-12-15
DE4301750A1 (de) 1994-07-28
FI940319A (fi) 1994-07-24
US5705034A (en) 1998-01-06
US5520782A (en) 1996-05-28
CA2113849C (fr) 1999-01-19
CA2113849A1 (fr) 1994-07-24

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