EP0571585A1 - Machine a papier a deux toiles. - Google Patents

Machine a papier a deux toiles.

Info

Publication number
EP0571585A1
EP0571585A1 EP92924575A EP92924575A EP0571585A1 EP 0571585 A1 EP0571585 A1 EP 0571585A1 EP 92924575 A EP92924575 A EP 92924575A EP 92924575 A EP92924575 A EP 92924575A EP 0571585 A1 EP0571585 A1 EP 0571585A1
Authority
EP
European Patent Office
Prior art keywords
wire
twin
former according
sieve
plate
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
EP92924575A
Other languages
German (de)
English (en)
Other versions
EP0571585B1 (fr
Inventor
Hubert Polifke
Franz Pisinger
Udo Grossmann
Sven-Ake Sahlin
Hans-Peter Sollinger
Dieter Egelhof
Christian Schiel
Thomas Zuefle
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JM Voith GmbH
Original Assignee
JM Voith GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE19924212609 external-priority patent/DE4212609A1/de
Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Publication of EP0571585A1 publication Critical patent/EP0571585A1/fr
Application granted granted Critical
Publication of EP0571585B1 publication Critical patent/EP0571585B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/48—Suction apparatus
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type
    • D21F9/006—Complete machines for making continuous webs of paper of the twin-wire type paper or board consisting of two or more layers

Definitions

  • the invention relates to a twin wire former for producing a fibrous web, in particular paper or cardboard web, from a fibrous suspension, in particular with the features specified in the preamble of claim 1.
  • the following documents are referred to the state of the art: 1. GB 2174120 A (file P 4083) 2.
  • EP 0371786 A2 is referred to the state of the art: 1. GB 2174120 A (file P 4083) 2.
  • the two documents 1 and 2 disclose different ones
  • Twin-wire former in which the top wire runs along the (essentially flat) underside of a drainage box.
  • this drainage box has rigid strips on its underside. Directly below these rigid strips, the bottom wire runs over flexible strips that can be pressed on. The latter are close together in some embodiments of the GB '120, so that in their area water cannot be drained downward through the lower sieve.
  • a flexible plate is provided instead of strips.
  • there are smaller or larger gaps between resiliently pressable strips which can absorb smaller or larger amounts of water and discharge them laterally to the outside. This also applies to the twin wire former according to EP '786.
  • one of the disadvantages of all these known arrangements is that - in the area of the resiliently pressable strips (or the flexible plate) - the drainage takes place exclusively (or almost exclusively) upwards. Therefore, the quality of the fibrous webs produced, particularly with regard to "formation” or “transparency”, leaves something to be desired. It is also problematic that the gaps mentioned clog over time, so that the formation becomes uneven across the width of the web.
  • twin wire formers of this type are described in documents 3 and 4.
  • the invention is therefore based on the object of designing a twin-wire former in accordance with the preamble of claim 1 in such a way that the quality of the fibrous web produced, in particular the formation (review), is further improved.
  • a screen support surface is provided in the initial region of that part of the twin-wire zone in which the fixed and flexible strips face each other - and / or immediately before this part of the twin-wire zone - via which one of the two sieve belts is running.
  • This screen support surface is preferably completely impermeable to water; but it can also be permeable to a limited extent. In any case, care is taken in the area of this screen support surface that the drainage "temporarily" exclusively (or almost exclusively) through the opposite sieve belt.
  • Temporarily means: only in a relatively small initial area of the part of the twin-wire zone mentioned). The normal double-sided drainage is therefore deliberately shifted a little in the direction of web travel.
  • the running direction of the sieve belts can be achieved through the twin-wire zone, i.e. with horizontal or inclined or vertical wire running direction.
  • the resiliently supported strips are generally that
  • a screen support surface is provided in not only one, but in each of the two screen loops.
  • the arrangement will be such that the two screen support surfaces overlap each other in whole or in part.
  • the substantially water-impermeable screen support surface provided according to the invention which temporarily impedes water drainage, may only be present at the beginning of the part of the twin-wire zone mentioned.
  • the invention is based on the knowledge that, deviating from all the previous constructions, only in the initial area of the zone in which rigid and resiliently supported strips lie opposite one another, the water drainage must be temporarily slowed down or prevented by one of the two sieves. This makes it possible to produce fibrous webs of the highest quality (especially with regard to the "formation"), and - as before - in a very large basis weight range from relatively thin paper webs to relatively thick cardboard webs.
  • Said part of the twin-wire zone, in which rigid and resiliently supported strips lie opposite one another, and in which at least part of the essentially water-impermeable screen support surface according to the invention is located, is referred to below as the “sandwich zone”.
  • the length of the sieve support surface mentioned is between 10 and 60% of the length of the "sandwich zone”.
  • the length of the screen support surface will depend on the operating conditions prevailing in the individual case (especially with regard to the
  • the position of the screen support surface can be different; it can e.g. partly in front of and partly within the "sandwich zone". Alternatively, it can be located entirely within the sandwich zone. In a preferred design, the position of the screen support surface can be varied within the limits mentioned.
  • the sieve support surface In order to eliminate the risk that (in the direction of travel) a backflow occurs in the fibrous suspension (as described above) in front of the sieve support surface, it is advantageous to attach the sieve support surface to the lower sieve by means of flexible elements (springs, pressure pads or the like) to press.
  • the pressure force (as with the flexible strips) can be freely selected within certain limits, for example by changing the spring force or the cushion pressure.
  • a secondary headbox can be provided.
  • a second layer can be applied to the pre-dewatered first fiber layer.
  • the two layers have different properties, for example different colors.
  • an additional advantage is achieved with the sieve support surface according to the invention, which supports the lower sieve in this case: namely, that the second suspension layer is not dewatered immediately after the application through the already dewatered first layer. Rather, the second suspension layer is initially exclusively (or almost exclusively) drained in the upward direction. This prevents a component of the second suspension layer, for example the dye, from rapidly penetrating into the first layer. In other words, it is achieved that certain different properties of the layers, for example different colors, remain unchanged until the paper or cardboard web is finished.
  • FIG. 1 to 8 shows one of the various exemplary embodiments in schematic representation, partly in side view, partly in longitudinal section.
  • Figures 9, 10 and 11 show structural details in different versions.
  • FIG. 12 is a schematic cross section through the initial area of a twin-wire zone with a closed wire support surface in the form of a film.
  • Drainage box has a rigid strip 8 at its front end (with respect to the direction of wire travel), which can however also be omitted. This is followed by a closed, ie water-impermeable plate 9A at a variable distance, which plate forms a sieve support surface 9 for the lower sieve belt 11.
  • the plate is supported on strips 27A and compression springs 24A (whose spring force can be adjusted) or on pneumatic pressure cushions on a rigid, water-permeable plate 26.
  • the upper drainage box 18, on which a guide roller 14 for the top wire 12 is mounted, can be suspended at the front and at the rear end, as shown schematically by double arrows P and P ', on support elements (not shown) which can be displaced approximately vertically.
  • the position of the guide roller 14 and the box 18 is adjustable, if necessary also during operation.
  • On the underside of the box 18 there is a row of, for example, at least eight strips 28, 28 'with, for example, a parallelogram-shaped cross section, which abut the top of the top wire 12 and are firmly connected to the box 18. Above the strips 28, 28 ', a front vacuum chamber 21 and a rear vacuum chamber 22 are provided in the drainage box 18.
  • the top wire 12 runs over the mentioned guide roller 14.
  • the bottom wire 11 forms an essentially horizontal one-wire pre-dewatering section between a headbox (not shown) and the meeting with the top wire ( see Fig. 2).
  • the pre-dewatered, but still partially liquid fiber suspension is shown exaggeratedly thick in FIG. 1.
  • the box 18 and guide roller 14 are adjusted such that the top wire 12 between the guide roller 14 and the first bar 28 'comes into contact with the top of the fiber suspension, namely at point K.
  • the inlet-side edge (or: “leading edge”) of the plate 9A is located approximately there.
  • Its drain-side edge (or: “trailing edge”) lies approximately below the third bar 28 of the box 18.
  • the zone in which the upper bars 28 lie opposite the lower bars 27 and part of the plate 9A is the so-called "sandwich zone" S.
  • the number of rigid strips 28 is greater (preferably approximately twice as large) than the number of lower, resiliently supported strips 27. The distances between two are at the upper drainage box adjacent strips 28 approximately two to four times the strip thickness. These distances are much larger for the lower strips.
  • each of the lower strips 27 lies opposite a gap between two upper strips 28.
  • Each two or three upper strips 28 lie opposite a gap between two lower strips 27. (Deviating from FIG. 1, the upper and lower Last also have approximately equal distances from each other, see Fig. 2-5).
  • the drainage boxes 17 and 18 are followed, for example, by a curved suction box 23 arranged in the lower sieve 11 or a similar curved suction box 23 'arranged in the upper sieve 12 in the form of an extension of the box 18.
  • the extent of this displacement can be varied by changing the position of the plate 9A in the web running direction or in the opposite direction; see for example the position labeled 9 '. Or you can use a plate with a different length L. However, at least the first upper ledge 28 'should generally face plate 9A.
  • the length L of the plate 9A (measured in the direction of wire travel) in FIG. 1 is approximately 50% of the length of the sandwich zone S.
  • FIG. 1 schematically shows further possible variants:
  • the plate 9A, which supports the lower sieve 11, can be in the loop of the
  • a plate 90 is provided, the underside (sieve support surface 9a) of which touches the upper sieve 12.
  • the plate 90 is preferably placed in place of the first (e.g. two or three) rigid ledges 28 'and 28, e.g. attached to correspondingly shortened strips. If the lower plate 9A is also present, the two plates 9A and 90 overlap at least partially. The position and / or length of plate 90 is also variable, as is the case with plate 9A.
  • the lower wire 11 runs on a headbox 10 over a breast roll 13 and then over drainage elements 16a, 16b and 16c.
  • the last of these drainage elements is designed as a curved suction box 16c; from here the bottom wire 11 runs with a slight downward inclination over a shoe 9B and via lower resilient lasts supported on a box 17.
  • the surface of the shoe 9B forms a water-impermeable sieve support surface 9 for the lower sieve 11.
  • the shoe 9B is made by means of two resilient elements, for example pneumatic pressure cushions 24C and 24B (which extend across the machine extend) supported on the box 17.
  • the pillow pressures are individually adjustable.
  • the front pressure pad 24C could be replaced with a hinge whose axis extends across the machine.
  • a secondary headbox 10 ' is arranged above the curved suction box 16. Above the shoe 9B and the lasts 27 there is in turn an upper sieve 12 which runs over the guide rolls 14 and 19 as well as over rigid lasts 28 'and 28 of an upper drainage box, which is otherwise not shown.
  • the front wire guide roller 14 is located only a short distance from the wire support surface 9. This is where the twin wire zone begins; it ends at a separating suction device 23A.
  • the twin-wire zone runs initially . with a slight downward inclination and then with a slight upward inclination to the above-mentioned vacuum cleaner 23A.
  • the rigid strips 28 are adapted to this course of the twin-wire zone; the same applies to the flexible strips 27 supporting the lower sieve and the shoe 9B. Its length L (in the direction of wire travel) is approx. 40% of the length of the sandwich zone S.
  • the twin-wire former shown in FIG. 3 again has a twin-wire zone, which in turn runs essentially horizontally but is slightly curved upwards; this comprises three sections I, II and III arranged one behind the other.
  • the only partially shown endless sieve belts (lower sieve 11 and upper sieve 12) run in the immediate vicinity of a headbox 10 via a breast roller 13 or 14, so that the two sieve belts form a wedge-shaped inlet gap 15 with each other at the beginning of the twin-wire zone.
  • the stream of material emitted by the baffle 10 comes into contact with the two sieve belts 11 and 12 only where the lower wire 11 runs in the first section I of the twin wire zone over a stationary, curved forming shoe 16.
  • the curved tread is formed from a few strips 16 '(with drainage slots located in between) and from an adjoining shoe 9C which forms a water-impermeable screen support surface 9.
  • the distance between the two breast rollers 13 and 14 can be varied.
  • the forming shoe 16 can be operated with or without negative pressure. It can be rigidly or resiliently supported on a machine frame (not shown) (for example by means of pneumatic pressure pads) (or at the inlet end by means of a joint and only in the area of the shoe 9C by means of a pressure pad).
  • the two wire belts 11 and 12 (with the partly still liquid fiber suspension in between) run between a lower drainage box 17 and an upper drainage box 18.
  • the lower drainage box 17 there are several strips 27
  • the upper drainage box 18 designed as in FIG. 1 has a plurality of rigid strips 28 on its underside.
  • part of the water of the fiber suspension is discharged downwards; another part penetrates - due to the tension of the upper sieve 12 - up through the upper sieve and is deflected by the foremost of the strips 28 into the front vacuum chamber 21.
  • the water penetrating upwards between the upper strips 28 reaches the rear vacuum chamber 22.
  • the water penetrating between the lower strips 27 through the lower sieve 11 is discharged downwards.
  • An additional bar 29 with a vacuum chamber 30 can be provided behind this in the loop of the top wire 12.
  • Flat suction devices 31 can also be provided in the loop of the lower wire.
  • the top wire 12 can be separated from the bottom wire 11 and from the fibrous web formed by means of a guide roller 19. Bottom wire and fibrous web then run over a wire suction roll 20.
  • the guide roller 19 can, however, also lie further back, so that the top wire 12 is only separated from the bottom wire 11 on the wire suction roll 20.
  • the distance between the two screens 11 and 12 is exaggerated. This is intended to illustrate that the two screens 11 and 12 converge over a relatively long distance within the twin-wire zone. This makes it clear that the process of forming the web on the first forming shoe 16 (in section I) starts relatively slowly and only ends in section III. The end of the
  • Main drainage zone in which the two sieves converge are, for example, approximately in the middle of the looping zone of the second molded shoe 23, as is shown by way of example in FIG. 3.
  • the end of the sieve convergence is symbolically represented by the point E; there the dry matter content of the paper web has reached approximately 8%.
  • This point can also e.g. lie on one of the flat suction cups 31 or in the end area of section II.
  • the exemplary embodiments shown in FIGS. 4 and 5 differ from the others primarily in that the twin-wire zone in the wire running direction is essentially vertically from the bottom to the bottom rises above. This simplifies the removal of the water extracted from the fiber suspension; because the water can be drained off evenly to both sides.
  • the middle section II of the twin wire zone in particular, no vacuum chambers are required.
  • the forming shoes 16, 23, in particular those arranged in the third section III, can be provided with a suction device if necessary.
  • Twin-wire formers are a for ier suction roller 40 and a plurality of water collecting containers 41, 42 and 43, further guide plates 44, which are assigned to the fixed strips 28, and a water discharge strip 45.
  • the remaining elements are provided with the same reference numerals as the corresponding elements in FIG. 3 The same applies to FIG. 5.
  • PCT / EP 90/01313 WO 91/02842.
  • FIG. 4 similar to FIG. 2, a shoe 9D with an essentially water-impermeable surface is provided at the inlet end of the drainage box 17, that is to say in front of the flexible strips 27. 5, on the other hand, such a shoe 9E is arranged in front of the rigid lasts 28.
  • each of the shoes 9C, 9D or 9E temporarily slows down the drainage through one of the two screens. This increases the rail quality (as explained at the beginning); in addition, there is the possibility of influencing the distribution of the fine and fillers over the thickness of the web (by changing the position and / or the length of the substantially water-impermeable screen support surface 9).
  • FIG. 6 differs from in only a few details Fig. 1:
  • the lower dewatering box 17 now has two rigid strips 8 below the wire guide roller 14.
  • An essentially water-impermeable plate 9F is considerably shorter in the direction of wire travel than in FIG. 1; its length L is only about 20% of the length of the sandwich zone S. It lies below the first three upper strips 28 ', 28, that is to say exclusively within the sandwich zone, and is on the rigid plate 26 via strips 27B and pneumatic pressure pads 24B supported.
  • each of the strips 27B has a widened head over which the lower sieve 11 slides. In this case, the plate 9F would be omitted.
  • FIG. 7 shows further possible modifications of the exemplary embodiment of FIG. 1: the two
  • Drainage boxes 17 and 18 form a sandwich zone S which is slightly inclined downward (with respect to the direction of wire travel).
  • the wire guide roller 14 ' is designed as a forming roller (ie with water storage capacity in the roller jacket) and is at a shorter distance from the first upper bar 28'. arranged so that the water which throws off the roller 14 'reaches the front vacuum chamber 21.
  • the substantially water-impermeable plate 9G which is resiliently supported on the rigid plate 26, rests in a joint 2 at its inlet end and on two (or on one) pneumatic pressure pad 24B at its outlet end. The initial area of the plate 9G is curved in order to divert the bottom wire 11 arriving in the horizontal direction into the inclined sandwich zone S.
  • a secondary headbox 10 ' is arranged so that the stream of material 1' emerging from it strikes the (in part still liquid) fiber suspension 1 arriving with the bottom wire 11 in the curved area.
  • the upper drainage box has an extension in the form of a curved suction box 23 ', which redirects the two sieve belts 11, 12 upwards and forced drainage of the web formed causes. 7 can be used individually or in combination with one another on the twin wire former according to FIG. 1. The one that is designed as a forming roller and brings the top wire 12 directly into contact with the fiber suspension
  • Screen guide roller 14 ' can ensure early drainage through the top screen and possibly a certain leveling of the jet coming from the secondary headbox 10' if it should be somewhat wavy across the screen width.
  • a perforated plate 9H is provided as part of a suction box 17 ′ which is rigidly (or resiliently) supported on the rigid plate 26.
  • the plate 9H forms a sieve support surface 9 "which is only permeable to a limited extent, so that in its area the drainage is slowed down but not completely prevented.
  • the sieve support surface 9" can be provided with through holes or slots. It is also conceivable that the plate 9H has grooves or grooves on its surface. The slots, grooves or grooves can extend parallel to the strip erection or form an acute angle with it, which is preferably less than 45 °.
  • the percentage of the open area based on the total area of the screen support surface 9 ", can be selected such that the water permeability of the screen support surface assumes as precisely as possible the value which gives the desired quality improvement to the finished product As a rule, the open area will be made relatively small so that the
  • Water permeability of the sieve support surface 9 is significantly smaller than the water permeability of the lower sieve 11.
  • a variable vacuum can be maintained in the suction box 17 '. In this way it is possible to control the speed of the dewatering taking place through the lower sieve 11 in the area of the sieve support surface 9 ′′ during operation. If the dewatering speed is to be kept relatively low in the region of the sieve support surface 9 ′′ you set the vacuum to a very small value, possibly to a value of zero. Alternatively, if necessary, a certain excess pressure can be set inside the box mentioned. In this case, the sieve support surface 9 "acts just as if it were impermeable to water.
  • a line 30 opens into the suction box 17 'and can be connected to a suction blower 32 or to a compressed air source 33 by means of a (only symbolically indicated) switching device 31.
  • vacuum or overpressure can be optionally set in the suction box 17 ', the height of which can be varied by means of a control valve 34.
  • FIG. 9 shows details of the plate 9A only indicated in FIG. 1 and the associated pressing device.
  • Upper screen 12 run in the direction of arrow R. From an upper drainage box only the first two strips 28 'and 28 are indicated, which extend transversely to the direction of screen travel.
  • One of the strips 27A extends with its head into a transverse groove 53 which is provided on the underside of the plate 9A and at the same time forms a flexible joint.
  • the inlet-side edge of the transverse groove 53 forms a stop 56. This abuts against the head of the bar 27 and thus prevents further displacement of the plate 9A in the wire running direction R. Such a displacement could be caused by the frictional force of the lower wire 11 on the plate 9A .
  • three strips 27A are provided to support the plate 9A. Deviating from this, there could also be only two or more than three strips.
  • a transverse groove 53 ' is also provided on the middle bar 27A and forms a flexible joint.
  • the normal thickness D of the plate is reduced to the dimension d, for example approximately to half the normal plate thickness D.
  • the plate 9A has in this way at every point, where the head of a bar 27A rests, a flexible joint. It is thus possible that the screen support surface 9 is not exactly flat in all operating states. Accordingly, the route of the
  • Bottom wire 11 not to be exactly level in all operating states.
  • the zones of the plate lying one behind the other can be pressed onto the lower wire with different forces.
  • the articulation of the plate 9A can be increased by narrow grooves 54 at the points where the strips 27A abut; these grooves 54 are of the sieve Support surface 9 incorporated into the plate.
  • Additional transverse grooves 55 or 56 can be worked into the plate 9A from below in order to further reduce their bending rigidity in the direction R of the wire.
  • the plate 9A rests on the strips 27A under its own weight.
  • the plate 9A is preferably made of plastic so that its weight per square meter is only about 30 kg or less. The plate 9A can therefore, after it has been lowered, be taken out of the machine transversely to the direction R of the wire (ie perpendicular to the plane of the drawing) and in the same or a similar manner
  • the plate 9A always remains in safe contact with the strips 27A, although there is no fixed connection between these components.
  • a tension spring 71 extends in the wire running direction R and from the stationary structure 57, 26 to one on the underside of the plate 9A attached console 72.
  • the tensile force of the spring 71 thus counteracts the frictional force which the lower sieve 11 exerts on the plate 9A.
  • the level of the tensile force can be adjusted by means of a nut 73, so that it can be adapted relatively precisely to the frictional force. Only one tension spring 71 is visible in FIG. 1; in
  • a nose 56 which rests on a roller 52, projects downward from the plate.
  • This roller is rotatably mounted on a bracket 51 which is attached to the stationary structure. This results in a low-friction sliding of the strips 27A between the guide arms 57, 58 when the plate 9J is placed against the lower sieve 11.
  • the low-friction support of the plate could also be carried out by means of a tab 50, which has one end on the plate and with is hinged at the other end to the stationary structure.
  • the plate 9J can be formed from a relatively thick but flexible film, for example with several incorporated layers of reinforcing threads or - as shown - with an incorporated fabric 66.
  • FIG. 11 Further alternatives for low-friction support of the plate 9K are shown in FIG. 11: On one of the strips 27A, rollers 47 and 48 are provided on the guide arms 57A and 58A. In a variant indicated by dash-dotted lines, the horizontal support of the plate 9K does not take place via the strips 27A, but rather via at least one additional support body 67. it is also guided between two rollers 68 and 69 which are mounted on the stationary structure. It is understood that in this case the projection 70 is omitted on the plate 9K.
  • the plate 9L is designed as a relatively thin, flexible film. This extends from a first winding device 63 across the machine to a second winding device 64. With the aid of these winding devices 63, 64, the film 9L is held under a certain tension; it is also - as in the other embodiments - with the help of Last 27A resiliently pressed against the lower wire 11. The direction of screen travel is perpendicular to the drawing plane in FIG.
  • the resiliently supported strips 27 and / or 27A are shown as strips that are independent of one another. Deviating from this, two or more adjacent strips 27 and / or 27A can be coupled to one another, e.g. with the help of struts or brackets which extend from bar to bar approximately parallel to the direction of wire travel, e.g. 10 schematically indicated at 71 in FIG.

Landscapes

  • Paper (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Compositions Of Oxide Ceramics (AREA)
  • Gas-Filled Discharge Tubes (AREA)
  • Automatic Disk Changers (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)

Abstract

Une machine à papier à deux toiles sert à fabriquer une bande de papier ou de carton. Deux toiles sans fin (boucles 11 et 12 de toile sans fin) forment ensemble une zone à deux toiles, dans laquelle la première toile sans fin (12) se déplace sur des barres fixes (28', 28) montées avec un écartement dans la caisse de déshydratation. En outre, dans la zone à deux toiles, l'autre toile sans fin (11) se déplace sur quelques barres (27) situées en face des barres fixes (28), soutenues par des éléments élastiques (ressorts 24, coussins pneumatiques de pression ou similaires) et pouvant être pressées avec une force sélectionnable contre l'autre toile sans fin. Une surface fermée (9) de support de toile sans fin est située en amont des barres (27) dans une des boucles fermées (par exemple 11) de la toile sans fin. Une admission secondaire de pâte (10') peut être située en amont de la surface fermée (9) de support de la toile sans fin.
EP92924575A 1991-12-17 1992-12-16 Machine a papier a deux toiles Expired - Lifetime EP0571585B1 (fr)

Applications Claiming Priority (7)

Application Number Priority Date Filing Date Title
DE4141607A DE4141607C2 (de) 1991-12-17 1991-12-17 Doppelsiebformer
DE4141607 1991-12-17
DE19924212609 DE4212609A1 (de) 1991-12-17 1992-04-15 Doppelsiebformer
DE4212609 1992-04-15
DE4235102 1992-10-17
DE19924235102 DE4235102C2 (de) 1991-12-17 1992-10-17 Doppelsiebformer
PCT/DE1992/001053 WO1993012292A1 (fr) 1991-12-17 1992-12-16 Machine a papier a deux toiles

Publications (2)

Publication Number Publication Date
EP0571585A1 true EP0571585A1 (fr) 1993-12-01
EP0571585B1 EP0571585B1 (fr) 1996-02-28

Family

ID=27203218

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92924575A Expired - Lifetime EP0571585B1 (fr) 1991-12-17 1992-12-16 Machine a papier a deux toiles

Country Status (8)

Country Link
US (1) US5507918A (fr)
EP (1) EP0571585B1 (fr)
JP (1) JPH06508186A (fr)
AT (1) ATE134729T1 (fr)
CA (1) CA2104230A1 (fr)
DE (2) DE4141607C2 (fr)
FI (1) FI933603A0 (fr)
WO (1) WO1993012292A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007020112A1 (fr) * 2005-08-12 2007-02-22 Voith Patent Gmbh Procede de fabrication d'une bande fibreuse et mouleur a tamis double destine a la mise en oeuvre du procede

Families Citing this family (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4219292A1 (de) * 1992-06-12 1993-12-16 Escher Wyss Gmbh Doppelsiebformer
DE4326867C2 (de) * 1993-08-11 1997-01-30 Voith Gmbh J M Siebpartie einer Maschine zur Herstellung von Faserstoffbahnen
DE4328024A1 (de) * 1993-08-20 1995-02-23 Voith Gmbh J M Doppelsieb-Blattbildner
FI100542B (fi) * 1993-11-12 1997-12-31 Valmet Paper Machinery Inc Paperikoneen hybridiformeri, joka on varustettu MB-yksiköllä
DE4400782A1 (de) * 1994-01-13 1995-07-20 Doerries Gmbh Doppelsieb-Former
DE4402273C2 (de) * 1994-01-27 1995-11-23 Voith Gmbh J M Papiermaschine zur Herstellung mehrlagiger Papierbahnen
US5935382A (en) * 1996-05-31 1999-08-10 Valmet-Karlstad Ab Method and board machine for manufacturing a paperboard web
DE29619709U1 (de) * 1996-11-13 1997-01-09 Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim Siebpartie einer Papiermaschine
US5932072A (en) * 1997-04-22 1999-08-03 Thermo Fibertek Inc. Paper forming activity blade with mounting buttons
AT405538B (de) * 1997-11-28 1999-09-27 Andritz Patentverwaltung Vorrichtung zum entwässern einer faserstoffbahn
DE19809480B4 (de) * 1998-03-07 2007-01-04 Voith Patent Gmbh Doppelsiebformer
US6379503B1 (en) * 1998-10-09 2002-04-30 Metso Paper Karlstad Ab Apparatus and method for mounting and dismantling a wear body in a paper making machine
CZ20021719A3 (cs) 1999-11-17 2002-10-16 Astenjohnson, Inc. Upevňovač čepele pro sekci s dvojitou formovací tkaninou
ATE352664T1 (de) * 1999-12-16 2007-02-15 Metso Paper Inc Entwässerungsleiste für eine papiermaschine
GB0030682D0 (en) * 2000-12-15 2001-01-31 Astenjohnson Inc Suction assisted skimmer blade
GB2370046A (en) 2000-12-15 2002-06-19 Astenjohnson Inc Adjustable resilient blade support
JP2003064593A (ja) * 2001-08-24 2003-03-05 Mitsubishi Heavy Ind Ltd 抄紙用フォーマ
WO2004018768A1 (fr) * 2002-08-23 2004-03-04 Metso Paper, Inc. Formation de nappe de papier ou de carton dans un formeur double toile ou dans une partie double toile d'un formeur
DE102004018329A1 (de) * 2004-04-13 2005-11-10 Voith Paper Patent Gmbh Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn
DE102005031202A1 (de) * 2005-07-01 2007-01-25 Voith Patent Gmbh Verfahren zur Herstellung einer Papierbahn, insbesondere Tiefdruckpapier
DE102005000175A1 (de) * 2005-12-05 2007-06-06 Voith Patent Gmbh Leiste zur nachgiebigen Stützung eines Siebs und Doppelsiebpartie
DE102007035488A1 (de) * 2007-07-28 2009-01-29 Voith Patent Gmbh Verfahren zur Herstellung einer Faserstoffbahn und Doppelsiebformer zur Durchführung des Verfahrens
DE102008040688A1 (de) 2008-07-24 2010-01-28 Voith Patent Gmbh Verfahren zur Optimierung der Energiebilanz in Formiereinheiten in Maschinen zur Herstellung von Faserstoffbahnen und Formiereinheit
CA2657627A1 (fr) * 2009-03-10 2010-09-10 Services Techniques Hds Presse a double toile
FI121797B (fi) * 2009-09-24 2011-04-15 Metso Paper Inc Vedenpoistoelementti kuiturainakonetta varten
DE102010031169A1 (de) * 2010-07-09 2012-01-12 Voith Patent Gmbh Blattbildungssystem für eine Maschine zur Herstellung einer zumindest einschichtigen Faserstoffbahn
DE102011003970A1 (de) * 2011-02-11 2012-08-16 Voith Patent Gmbh Blattbildungsvorrichtung
US8871059B2 (en) 2012-02-16 2014-10-28 International Paper Company Methods and apparatus for forming fluff pulp sheets
TWI727265B (zh) 2018-02-28 2021-05-11 日商精工愛普生股份有限公司 網材形成裝置及片材製造裝置

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1346385A (en) * 1972-09-09 1974-02-06 Valmet Oy Dewatering wet webs in paper-making machines
DD146316A1 (de) * 1979-10-01 1981-02-04 Werner Kretzschmar Entwaesserungsvorrichtung fuer an einem endlosen sieb haftende faserstoffbahnen
FI72761C (fi) * 1981-05-15 1987-07-10 Valmet Oy Formningsparti med dubbel vira i pappersmaskin.
DE3138133C2 (de) * 1981-09-04 1986-03-06 Sulzer-Escher Wyss GmbH, 7980 Ravensburg Entwässerungseinheit für Langsieb-Papiermaschinen
FI75376C (fi) * 1982-04-30 1988-06-09 Valmet Oy Formningssko foer formare i pappersmaskin.
GB2174120B (en) * 1985-04-26 1988-08-10 Doerries Gmbh Apparatus for guiding the wires of a twin wire forming section of a paper or cardboard machine
FI862808A (fi) * 1986-07-02 1988-01-03 Ahlstroem Oy Foerfarande och anordning foer avvattning av en fiberbana.
DE3823966C2 (de) * 1988-07-15 1995-03-16 Voith Gmbh J M Vorrichtung zum Führen der Siebe einer Doppelsiebpartie einer Papier- oder Kartonmaschine
FI885607A (fi) * 1988-12-01 1990-06-02 Ahlstroem Valmet Anordning foer styrning av viror i en pappersmaskins former.
FI885606A (fi) * 1988-12-01 1990-06-02 Ahlstroem Valmet Banformningsfoerfarande och anordning.
FI98540C (fi) * 1989-05-08 1997-07-10 Valmet Corp Laite paperi- tai kartonkirainan muodostamiseksi kuitumateriaalista
JPH038889A (ja) * 1989-06-06 1991-01-16 Mitsubishi Heavy Ind Ltd 抄紙機の湿紙形成装置
DE3927597A1 (de) * 1989-08-22 1991-02-28 Voith Gmbh J M Doppelsieb-former
DE4002304A1 (de) * 1990-01-26 1991-08-14 Escher Wyss Gmbh Former in einer papiermaschine
DE4026953C2 (de) * 1990-01-26 1995-11-30 Escher Wyss Gmbh Entwässerungsvorrichtung und Verfahren zur Entwässerung an einem Doppelsiebformer
DE4005420C2 (de) * 1990-02-21 1995-06-08 Voith Gmbh J M Doppelsiebformer
DE4009627A1 (de) * 1990-03-26 1991-10-10 Voith Gmbh J M Leiste zur nachgiebigen stuetzung eines siebbandes
DE4019884A1 (de) * 1990-06-22 1992-01-09 Voith Gmbh J M Leiste zur nachgiebigen stuetzung eines siebbandes
DE9105797U1 (de) * 1991-05-10 1991-07-04 J.M. Voith Gmbh, 7920 Heidenheim Doppelsiebpartie einer Papier- oder Kartonmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9312292A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007020112A1 (fr) * 2005-08-12 2007-02-22 Voith Patent Gmbh Procede de fabrication d'une bande fibreuse et mouleur a tamis double destine a la mise en oeuvre du procede

Also Published As

Publication number Publication date
DE59205505D1 (de) 1996-04-04
DE4141607C2 (de) 1996-04-25
DE4141607A1 (de) 1993-06-24
ATE134729T1 (de) 1996-03-15
FI933603A (fi) 1993-08-16
WO1993012292A1 (fr) 1993-06-24
CA2104230A1 (fr) 1993-06-18
US5507918A (en) 1996-04-16
JPH06508186A (ja) 1994-09-14
FI933603A0 (fi) 1993-08-16
EP0571585B1 (fr) 1996-02-28

Similar Documents

Publication Publication Date Title
EP0571585B1 (fr) Machine a papier a deux toiles
EP0489094B2 (fr) Dispositif pour la fabrication du papier comprenant deux toiles
DE4005420C2 (de) Doppelsiebformer
AT406694B (de) Verfahren zur entwässerung endloser faserstoffbahnen sowie siebpartie einer maschine zur herstellung von faserstoffbahnen
DE3929265C2 (de) Leiste für Blattbildungszone einer Papiermaschine
DE3138133A1 (de) Entwaesserungseinheit fuer langsieb-papiermaschinen
DE69221034T2 (de) Siebbelastungsvorrichtung in einer Papiermaschine
DE69707256T3 (de) DOPPELSIEBFORMER MIT ROLLE UND KLINGE FüR EINE PAPIERMASCHINE
EP0665914B1 (fr) Formeur a deux toiles
DE4014403C2 (de) Vertikalformer
DE2549726A1 (de) Siebpartie einer maschine zum herstellen einer faserbahn
DE1303220C2 (de) Papiermaschine
DE1147470B (de) Vorrichtung zum Herstellen von Bahnen aus Papier, Pappe od. dgl.
DE3406217C1 (de) Vorrichtung zum Führen der Siebe einer Doppelsiebpartie einer Papier- oder Kartonmaschine
EP0515964B1 (fr) Section de formage à deux toiles pour machine à papier
AT402746B (de) Doppelsiebformer mit örtlich verstellbarer entwässerungsleiste
DE3823966C2 (de) Vorrichtung zum Führen der Siebe einer Doppelsiebpartie einer Papier- oder Kartonmaschine
EP0571584A1 (fr) Machine a papier a deux toiles
DE2850361C2 (de) Papiermaschine
DE3803805C1 (fr)
DE9115632U1 (de) Doppelsiebformer
EP0940500B1 (fr) Section de formage à deux toiles
EP0824159A2 (fr) Procédé et dispositif pour la fabrication d'une bande fibreuse
EP4328376A1 (fr) Formeur à tamis oblique
DE3441612A1 (de) Stoffauflauf fuer entwaesserungsmaschinen

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19930714

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT DE FR GB SE

17Q First examination report despatched

Effective date: 19941220

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAH Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOS IGRA

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT DE FR GB SE

REF Corresponds to:

Ref document number: 134729

Country of ref document: AT

Date of ref document: 19960315

Kind code of ref document: T

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19960226

REF Corresponds to:

Ref document number: 59205505

Country of ref document: DE

Date of ref document: 19960404

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 19981120

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 19981216

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 19981223

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 19981228

Year of fee payment: 7

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 19990203

Year of fee payment: 7

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19991216

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19991216

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 19991217

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 19991216

EUG Se: european patent has lapsed

Ref document number: 92924575.1

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20000831

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20001003

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST