EP2449174A1 - Forming unit and method for producing a material web - Google Patents
Forming unit and method for producing a material webInfo
- Publication number
- EP2449174A1 EP2449174A1 EP10720288A EP10720288A EP2449174A1 EP 2449174 A1 EP2449174 A1 EP 2449174A1 EP 10720288 A EP10720288 A EP 10720288A EP 10720288 A EP10720288 A EP 10720288A EP 2449174 A1 EP2449174 A1 EP 2449174A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire
- drainage
- support surface
- belt
- forming unit
- 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
Links
- 239000000463 material Substances 0.000 title claims abstract description 19
- 238000004519 manufacturing process Methods 0.000 title claims description 6
- 239000000725 suspension Substances 0.000 claims abstract description 47
- 238000013461 design Methods 0.000 claims abstract description 18
- 230000015572 biosynthetic process Effects 0.000 claims description 16
- 239000000835 fiber Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 6
- 238000011161 development Methods 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000006978 adaptation Effects 0.000 description 4
- 238000011144 upstream manufacturing Methods 0.000 description 4
- 238000007596 consolidation process Methods 0.000 description 3
- 230000018044 dehydration Effects 0.000 description 3
- 238000006297 dehydration reaction Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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
- D21F1/483—Drainage foils and bars
-
- 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
- D21F1/52—Suction boxes without rolls
Definitions
- the invention relates to a forming unit, in particular sheet forming unit for use in a machine for producing a material web from a fiber or nonwoven suspension, comprising at least two endlessly circulating sieve belts, which are guided over at least a portion of their circulation path to form a twin-wire zone, one within the twin-wire zone in the second the two Siebb selected arranged and one, a functionally rigid and besaugbare openings having support surface for this screen forming drainage device, and at least one upstream of the running in the cross machine direction inlet line of the second screen belt on the support surface, on the first wire belt to form a first dewatering section effective further drainage device comprising at least one resiliently supportable and against the first wire belt positionable drainage element.
- the invention furthermore relates to a method for producing a material web in a forming unit in a machine for producing a material web from a fiber or nonwoven suspension in which the pulp suspension applied from a device for application to a first wire belt is fed to a twin-wire zone in the region of the screen merge of the first screen belt with a further second screen belt in a first dewatering section by introducing at least one dewatering pulse arranged in the first screen belt into the web and, in a subsequent second dewatering section in the twin-wire zone, on openings which act on the second screen belt and support and suck these having more rigid support surface is further dehydrated.
- Forming units are previously known in a variety of prior art designs.
- hybrid formers are also used for dewatering at least one dewatering device within a twin-wire zone, following pre-dewatering carried out within a four-wire arrangement. Basically, it can be positioned between forming units with incipient straight sieve guide on a support surface of a first dewatering device in the twin-wire zone with or freely yieldable and against the sandwich of the two mesh belts and the interposed fibrous suspension positionable drainage elements, eg.
- Forming units according to the first embodiment with against the sandwich of the two sieve bands and the interposed pulp suspension positionable drainage elements in the form of contact strips, starting in front of the first dewatering device of the twin-wire zone are exemplified in the Voith company publication "The Duoformer D concept" (Voith DE 40 2005 047 347 A1, DE 10 2005 038 424 A1, by means of the positionable drainage elements in the form of pressable strips
- pressure pulses for generating a desired dewatering profile are introduced into the fibrous suspension at least indirectly, in particular via the screen belt carrying the fibrous suspension, in a first initial dewatering section
- the fibrous suspension then becomes between the two Sieve tapes on a newly executed support surface of a drainage device, in particular in the form of a Obersiebsaugkastens in the twin-wire zone.
- a major disadvantage of such forming units with incipient straight sieve guide in the subsequent twin-wire zone with or without drainage elements in the form of compressible counter-strips relative to the support surface within the second dewatering section formed in this is that in the second dewatering section and thus in the second part of the initial drainage sufficiently stable Sieb entry , especially at high wire speeds, is not always possible.
- the type of Sieb Installation on a flat support surface, the other in the other of the support surface not directly supported screen belt flexibly contactable counter strips are assigned and, because the adjustable dewatering pressure is independent of the wire tension, although at low wire speeds to optimal formation results. At high wire speeds, however, a reliable wire guide can no longer be guaranteed with this geometry and the setting of optimum dewatering conditions no longer exists.
- Forming units with incipient curved or straight sieve guiding in the twin-wire zone with or without yieldably supportable drainage elements which can be positioned against the sandwich from the two sieve belts and the fibrous suspension arranged therebetween in the form of pressable strips, starting at the first drainage device in the twin-wire zone are for example from the publications DE 23 26 867 A1 and WO 2004/018768 A1 previously known.
- the sieve consolidation takes place before the inlet of the second sieve belt on the support surface of the dewatering device within the twin-wire zone.
- the dewatering pressure in particular the dewatering pressure upward in the arrangement of the dewatering device in the upper wire in the field of Siebzusammen entry depends on the layer height of the incoming pulp suspension.
- a predominantly pulse-free dewatering and thus equal pressure drainage which is determined by the radius of the support surface formed by the dewatering device and the wire tension in this area, is therefore not given.
- Much more here is a pressure pulse drainage, in which the pulse height can be described as a function of the local pulp suspension height.
- the dewatering pressure is generally too strong and moreover not adaptable to changing conditions.
- the problem lies in the safe and reproducible guarantee of a sheet formation corresponding to the requirements, even at very high machine speeds and thus screen speeds to form an initial, that is initial upper fiber mat to achieve a predefined formation with the greatest possible mechanical retention.
- This requires an optimal downstream drainage pressure, ie, machine direction, flow which initially allows for gradual and flexible changing conditions, and subsequently, once the first portion of the upper side initial drain is completed after passing through the first dewatering section ensures stable and trouble-free sieve guidance and enables the setting of a higher drainage pressure in the second drainage section.
- the invention is therefore based on the object, forming units of the type mentioned in such a way that the disadvantages mentioned are avoided and a two- or multi-stage initial drainage in the double-wire zone in a predefined direction, in particular upwards is realized.
- the sheet formation should be able to take place without interference in the desired quality even at very high machine speeds and thus screen speeds.
- the solution according to the invention must be suitable for optimally adapting the dewatering conditions to changing parameters of the pulp suspension, such as changing basis weights and pulp suspension layer heights.
- the solution according to the invention is characterized by the features of independent claims 1 and 29. Advantageous embodiments are described in the subclaims.
- a forming unit according to the invention in particular sheet forming unit for use in a machine for producing a material web from a fiber or nonwoven suspension, comprising at least two endlessly circulating sieve belts, which are guided over at least a portion of their circulation path to form a twin-wire zone, one inside the twin-wire zone in the second of the two Sieve straps arranged and one, a rigid, besaugbare openings having support surface for this screen forming drainage device, and at least one upstream of the inlet line of this second screen belt on the support surface, on the first wire belt to form a first dewatering section effective drainage device comprising at least one resilient abstützbares and against the first sieve belt positionable drainage element, is characterized in that at least in the direction of wire direction directly adjoining the inlet line Subregion of a second dewatering section descriptive support surface is curved.
- a support surface having openings is meant a surface on which the screen belt is guided or which cooperates with the screen belt. This can be formed by a, according to the desired geometry shaped and perforated surface element or from a plurality of individual spaced-apart surfaces.
- the entry line describes the beginning of the contact area between the support surface and the second wire.
- the area of Siebzusammen entry describes the theoretically extending in the cross-machine direction separating line in the leadership of the pulp suspension before which the pulp suspension is guided with only a sieve belt and at or after which the pulp suspension is passed between the two sieve belts and after which the drainage of the fluid, in particular white water through the other second sieve belt passes.
- This corresponds to a cutting line running transversely to the direction of the wire feed, at which the second wire belt cuts into the fiber suspension guided on the first wire belt at a preferably adjustable cutting angle.
- the screen merge does not coincide with the inlet line.
- a resiliently supportable drainage element that can be positioned against the first sieve belt is understood to be a drainage element, via whose active area acting on the first sieve belt a localized dehydration pulse is introduced into it and the pulp suspension.
- Resilient means that at least the active surface, preferably the entire dewatering element is elastically supported. The positioning allows a change in the position of the effective surface on the wire belt with the introduction of a pressure.
- the combination according to the invention of an arrangement of at least one flexible drainage element which can be positioned against the first screen belt in front of the inlet line of the second screen belt on the support surface of the drainage device and the guide along a subsequent second at least initially curved drainage section enables the realization of a two-stage or multi-stage initial drainage. especially when the first screen belt as a lower wire and second screen belt as a top wire upwards.
- the initial dewatering that is, the initial dewatering through the second wire, in particular the upper wire, thereby already begins before the support surface of the dewatering device of the twin-wire zone.
- the arrangement and design of the guide elements of the two sieve belts takes place such that the sieve combination is arranged within the first dewatering section.
- the fluid in particular white water, is pressed out of the surface of the pulp suspension which is still slightly concentrated in this region, so that a passage is already provided here.
- the pressed by the second wire belt fluid is peeled in the region of the inlet line on the support surface of this, in particular arranged on this first rigid area, in particular a first rigid Skimmer advisor and toward the inside of the second Siebbands, that is, when running as upper sieve upwards dissipated. Due to the possibility of positioning the at least one dewatering element against the first wire, the dewatering in this area is very gentle and can be varied and very sensitively increased and adjusted with respect to the required pressure and pressure profile in the wire direction.
- the subsequent dewatering in the second dewatering section may be described as a function of the applied dewatering pressure due to the geometry of the support surface of the dewatering device and the screen.
- the first dewatering section arranged in front of the inlet line in the circumferential direction of the first screen belt advantageously has a length of from 20 mm to 600 mm, preferably from 60 mm to 450 mm, particularly preferably 330 mm. By the length of the first dewatering section, the dewatering pressure can be built up gradually and with a flat characteristic curve, which allows a particularly gentle and uniform drainage.
- the dewatering device which acts on the first wire in the first dewatering section preferably has a plurality of dewatering elements which are arranged spaced apart in wire direction, yieldably supportable and positionable with respect to the first wire, in particular extending over the width of the forming unit and an active surface for cooperation with the first screen belt forming strips, wherein the number is preferably in the range of 1 to 5, more preferably 3.
- the distance between two adjacent arranged, opposite the first wire belt positionable drainage elements is in the range of 40 mm to 240 mm, preferably 120 mm, wherein the distances between two adjacent drainage elements may be preferably the same, approximately the same or different.
- the last dewatering element of the first dewatering section is arranged at a distance of 20 mm to 200 mm, preferably 60 mm to 120 mm, particularly preferably 90 mm away from the inlet line in the direction before the inlet line on the support surface.
- the active surface of the respective movable, in particular positionable against the first sieve belt dewatering element is characterized by an effective length, that is extension of effective on the wire belt effective area viewed in wire direction in the range of 5 mm to 30 mm, the effective lengths of several Drainage preferably equal, approximately the same or different.
- the design of a single, resiliently compressible drainage element is characterized by at least one of the following properties:
- the respective dewatering element which can be positioned against the first sieve belt preferably has an angle of attack with respect to the first sieve belt, which is selected in the range from -2 ° to + 2 °, wherein the individual angles of attack of a plurality of drainage elements are preferred may be the same, approximately the same or different.
- the individual arranged in the first dewatering section yieldingly supportable and positionable against the first wire belt drainage elements are preferably designed and dimensioned so that they can be pressed with pressures in the range of 0 mbar to 400 mbar, preferably 60 mbar to 250 mbar against the first wire belt.
- the contact pressures of the individual drainage elements can each be steplessly or in stages and for each drainage element individually or for several together in groups adjustable.
- the adjustment of the pressures in adaptation to a desired, preferably continuous Entskyss réellesdruckverlauf takes place.
- the pressure ranges mentioned here ensure the desired effect with regard to pulse generation and the resulting formation.
- the curved area of the support surface extending from the entry line in the direction of wire run is convex and the length of the envelope describing the support surface in the machine direction is selected in the range from 50 mm to 1000 mm, preferably 60 mm to 300 mm, but at least 50 mm. This length allows a sufficient dewatering time and safe wire guide.
- the support surface is formed either only in the initial region starting from the inlet line, in addition, furthermore, at least in the outlet region of the second screen belt, but preferably completely curved.
- the guide on a completely curved in Sieblaufraum surface allows the setting of an optimal drainage pressure curve already due to the geometric design of the support surface in this direction and prevents lifting of the screen belt of this.
- the curvature of the individual portions of the support surface or the entire support surface descriptive envelope is characterized by one, but preferably by a sequence of at least two radii.
- the radius in the region of the inlet line of the second screen belt at the support surface is between 0.1 m and infinity, preferably 0.1 m to 5 m.
- the single radius, in particular at the inlet line or the other partial areas of the support surface is characterized by a size in the range between 1 m and 10 m, preferably 2 m to 5 m.
- the size of the open surface writable by the openings of the support surface describing the second dewatering section is 20% to 90%, preferably 40% to 90% of the support surface.
- the ratio of the support area of the second dewatering section to the length of the first dewatering section is in the range of 10 to 0.1, preferably 5 to 0.2.
- the control / functional parameters of the second dewatering section can be varied by additional modifications.
- the influencing of the dewatering behavior present in the direction of erection of the support surface in the direction of erection can take place actively or passively.
- at least one, preferably a plurality of resiliently supportable and positionable against the first wire belt drainage elements can be assigned to the inlet line on the support surface in the direction of wire downstream of the first wire.
- these may additionally or alternatively be arranged in at least one further subarea of the support surface arranged at a distance from the entry line or over the entire support surface in a first embodiment, at least one first region extending from the inlet line over a partial region of the support surface become.
- the influencing of the dewatering behavior in the first and / or second dewatering section by means of resiliently supportable and positionable dewatering elements can be effected actively by the individual and / or group-controlled activation of the individual dewatering elements, in particular adjustment of the force acting on them with the screen belt and allows a locally targeted and directly effective influencing of the formation in the pulp suspension as well as easily realizable adaptation to changing operating parameters.
- Passive influencing can be achieved by the geometric design, in particular the length of the respective regions in the wire direction and the design of the elastic support.
- the individual adjustable drainage elements in the first and / or second dewatering section are in the simplest case of variably compressible, transversely extending to Sieblaufraum strips or strip-shaped
- Formed elements are in terms of their resilient support and / or the positioning against the first wire each within a dewatering section individually, in groups or jointly controllable.
- the formation of the support surface describing the second dewatering section can be effected by a perforated surface or a plurality of strip-shaped elements arranged at a spacing from one another in the wire-winding direction of the belts and arranged in parallel. These are in functional position with respect to the arrangement of their active surface rigid, that is free of a resilient, in particular elastic support and in a particularly advantageous embodiment of a component, preferably adjustable, in particular pivotable Siebsaugkastens.
- the support surface of the arranged in the twin-wire dewatering device is associated with at least one means for generating a negative pressure.
- the negative pressure is preferably adjustable over the extension of the support surface in and / or transversely to the wire direction.
- the forming unit according to the invention is designed in a particularly advantageous embodiment as a hybrid former, wherein the first wire belt is part of a four-wire arrangement, which is guided over at least a screen table.
- the upper-side initial that is, initial drainage in the inlet line upstream of the drainage device may function as a function
- the design in particular the geometry / shape, the width or length in the direction of the wire run, the angle of attack of the drainage elements,
- the arrangement of the drainage elements to each other, in particular the distance and the function parameters, in particular contact pressure be set.
- the arrangement and the number are fixed parameters during operation, which can be superimposed with the variable function parameters, such as the variation of the contact pressure.
- the subsequent upper-side initial drainage in the second dewatering section is essentially characterized as a function of the geometrical design of the support surface forming it, the properties of the covering and the length.
- this can be further by the additional arrangement of further, compared to the support surface in not directly supported by this screen belt arranged drainage elements, preferably as a function of the arrangement, number, the extension length of such drainage elements on the support surface, number, pitch, geometry and dimensioning and angle and the Functional parameters, such as contact pressure of the individual drainage elements, are varied.
- the basic design is flexible only by a combination of a first curvature region of a besaugbaren support surface within the Doppelsiebzone with in front of the inlet line on the support surface, that is variable-pressure dewatering elements characterized.
- This basic design can be modified in advantageous developments to achieve a variety of advantageous properties. The modification takes place essentially by the assignment and / or arrangement of additional drainage elements in the second dewatering section of the support surface opposite.
- the drainage pulses which can be introduced into the first screen belt in the first dewatering section are preferably variably adjustable over the extent of the first dewatering section in the direction of wire feed and / or transversely thereto.
- the drainage in the second dewatering section is carried out in the basic version due to the tension of the guided on the support surface screen belts and can be modified in advantageous developments by the provision of additional drainage elements and due to applied negative pressure.
- FIG. 1a illustrates, on the basis of a section from an axial section of a machine for producing a material web, the structure of a forming unit according to the invention
- FIG. 1 b shows a detail according to FIG. 1 a;
- FIGS. 3a to 3c illustrate examples of possible embodiments of the invention
- FIGS. 4a and 4b illustrate possible embodiments of individual suction zones on the drainage device.
- FIG. 1a shows, in a schematized and greatly simplified illustration, a basic section and the basic function of a forming unit 1 designed according to the invention for use in a machine for producing webs of material, in particular fibrous or nonwoven webs from a fiber or nonwoven web suspension, briefly below Called pulp suspension FS.
- a coordinate system In the installation position in the machine for producing material webs, the X direction describes the direction of passage of the resulting material web through it and is also referred to as machine direction MD.
- the Y direction describes the cross-machine direction and corresponds to the width direction, which is also referred to as CD or cross-machine direction.
- the Z direction corresponds to the height direction.
- the forming unit 1 comprises at least two endlessly circulating screen belts, a first screen belt 2 and a second screen belt 3, which are arranged and guided over a partial region of their circulation path in such a way that they form a double-screen zone 4.
- the first wire 2 in the arrangement acts as a lower wire
- the second wire 3 forms the outer screen having an outer 3.1.
- the forming unit 1 according to FIG. 1 a is designed as a hybrid former with a longitudinal wire section 5 and the twin-wire zone 4.
- the first screen belt 2 is part of the long wire section 5 and the twin wire zone 4. At this, the pulp suspension FS is supported by the said sections.
- a device 6 is provided in the form of a headbox.
- the device 6 comprises an extrusion device with at least one extrusion nozzle which extends in the width direction of the rotatable support surface 7, in particular over the desired width of the material web to be produced or in the cross-machine direction CD.
- the device 6 can be designed in various ways. In this regard, reference is made to known embodiments of the prior art.
- the curved support surface 7 is rotatably mounted in the illustrated case about an axis R 7 and is formed by the shell of a roller, which is at least partially wrapped by the endless rotating screen belt 2.
- the screen belt 2 is deflected on the roller and guided at least in sections between the support surface 7 and double-wire zone 4 via a dewatering device 8, in particular in the form of a screening table, which is arranged within the first screen belt 2 and supports it on its inside 2.2. In the area of the screening table 8, a dehydration of the pulp suspension FS in the direction of gravity takes place.
- a screen table reference is made to the known prior art.
- This preferably has a ceramic covering with openings, in particular in the form of slots or holes and is part of the wire section 5.
- the pulp suspension FS is guided between the two endlessly circulating screen belts 2, 3, for which purpose the two screen belts 2, 3 are guided approximately parallel to one another over a partial region of their circulation path.
- the Siebzusammen Entry SZ describes the area in which the second wire 3 cuts into the guided from the first wire 2 fibrous suspension FS at an angle beta. This range can be defined by a theoretically assumed axis running in the cross machine direction CD and furthermore defines the beginning of the action of the twin-wire zone 4 on the pulp suspension FS.
- At least one drainage device 11 forming a rigid support surface 9 with openings 10 is provided.
- the second wire 3 is performed with its inside 3.2 supporting.
- the support surface 9 is immediately downstream of the Siebzusammen Entry SZ and describes a second dewatering section II.
- the second wire 3 meets at the inlet line E on the support surface 9.
- a drainage device 12 which is effective on the inner side 2.2 of the first screen belt 2 and forms a first dewatering section I comprising at least one resiliently supportable drainage element 13 which can be positioned against the first wire belt 2, here in the wire direction spaced and parallel to each other arranged drainage elements 13.1 to 13.n in the form of contact strips, which with their, the screen belt 2 on the side of the pulp suspension FS side facing away, here the inside 2.2 touchable surfaces effective areas 14.1 to 14 n form whose Size may vary depending on the geometry and / or dimensioning of the strips and the arrangement.
- the nachgie- Bige support is preferably carried out by elastic support, for example via elastic elements in the form of spring units, membranes or pressure pads and thus allows movement of the active surfaces 14.1 to 14. n opposite the inside 2.2 of the first screen belt 2. Furthermore, the respective active surface 14.1 to 14th n, in particular the respective bar by means of a preferably freely selectable force, for example by means of a corresponding actuating device against the first screen belt 2 pressed.
- a plurality of drainage elements 13.1 to 13.n are provided in the first drainage section I.
- the number is between 1 and 5, preferably 1 to 3, more preferably 3.
- the length ⁇ of the arranged before the line E and preferably extending to this first dewatering section I viewed in the wire direction of the first wire belt 2 is 20 mm to 600 mm , preferably from 60 mm to 450 mm, particularly preferably 330 mm.
- the distance a13 between two adjacently arranged drainage elements 13.1 to 13.n, which can be positioned relative to the first wire belt 2, is preferably between 40 mm to 240 mm, preferably 120 mm.
- the last drainage element 13.n in the direction of the direction of the run before the inlet line E on the support surface 9 is arranged at a distance a of 20 mm to 200 mm from the inlet line E.
- the angle of attack alpha of a single dewatering element 13.1 to 13.n is preferably between -2 ° to + 2 °.
- the screen consolidation SZ takes place in the region of the extent of the first dewatering section I, preferably on the dewatering element 13.n.
- the individual distance a13 between two drainage elements 13.1 to 13.n arranged adjacent to one another, the angle of attack alpha and the dimensioning / execution of the individual active surfaces 14.1 to 14.n and / or of the entire drainage element 13.1 to 13.n can either be the same, approximately the same or but different from each other.
- At least one, preferably all individual drainage elements 13.1 to 13.n are used to introduce pressure pulses into the screen belt 2, which in turn transfers these to the pulp suspension FS, and can be pressed on educated.
- the resilient support and contact pressure and generation of the contact pressure can be done by way of example mechanically, hydraulically or pneumatically.
- the function of the flexible support and contact pressure in functional concentration is taken over by the same elements.
- the individual dewatering element is resiliently supported in adaptation to the conditions occurring during operation of the forming unit 1 and the active area is always positioned with a predetermined force against the wire belt 2.
- Active influencing means the temporally and / or locally variable adjustability of the contact forces of the individual active surfaces 14.1 to 14.n against the screen belt 2.
- the individual drainage elements 13.1 to 13.n are free from mechanical coupling with each other, but can gela at a common support means - be fermented.
- This initial curvature of the support surface 9 in the subregion 9.1 can be described by a radius r 9 i or a sequence of radii and is based on the design of the Drainage device 11 convex.
- the support surface 9 in the region of the flow line A of the second screen belt 3 of the support surface 9 is also formed curved.
- the wire guide in the second dewatering section II takes place on a support surface 9 that is completely curved.
- the envelope curve describing the support surface 9 can be characterized by one or a plurality of radii.
- the single radius is chosen between 1 m and 10 m, preferably 2 m to 5 m.
- the radii can be variably adjusted in size and sequence to the application requirements.
- the support surface 9 is provided on an upper suction suction box 18 and exemplified by a flat element with openings 10 or spaced from each other by a plurality in the wire direction, rigid and active surfaces 21.1 to 21 n forming strip-shaped elements 19.1 to 19. n educated.
- the first strip-shaped element provided in the direction of wire run on the support surface 9 is designated 17 and functions as a skimmer strip for peeling off the fluid emerging through the second wire 3.
- the design and / or dimensioning and arrangement of the rigid strip-shaped elements 19.1 to 19.n can be the same, approximately the same or different.
- the inlet line E downstream in the twin-wire belt arrangement II only initial dewatering in the direction of the second screen belt 3, in particular upper belt sets by the dewatering device 1 1.
- the initial drainage begins by the second wire 3 in the field of Siebzusammen entry in front of the support surface 9, in particular Skimmerang 17 in execution of Dewatering device 1 1 as Obersiebsaugkasten 18.
- the fluid, in particular white water from the little concentrated surface of the pulp suspension FS is pressed due to the action of the resiliently supportable and against the first wire 2 positionable drainage elements 13.1 to 13.n through the second wire 3, by peeled off this dehydrated water from the Skimmer advisor 17 and discharged upward, preferably via a vacuum zone, not shown here.
- the Obersiebsaugkasten is characterized by at least one suction zone or a plurality of suction zones. This gentle initial drainage offers significant advantages over that of a curved shoe or forming roll.
- the length In the writable by this envelope for supporting the second screen belt 3 is preferably between 50 mm to 1000 mm, preferably 60 mm to 300 mm, but at least selected 50 mm.
- the second dewatering section II can after the expiration of the second screen belt 3 from the support surface 9 further, not shown here dewatering sections, in particular to the formed formation further transporting screen belts 2 or 3, here the screen belt 2 after separation of the screen belts 2, 3 in the separation area 20, which is supported by a separating element, in particular suctionable roller 23 or curved suction, connect. These may be part of further functional units outside the drainage device 11.
- the support surface 9 can be described after the at least initially curved design in the partial area 9.1 by further straight or curved surface areas to the flow line A of the second screen belt 3, here, for example, the area 9.n and the twin-wire zone 4, which is also about may extend beyond the drainage section II, be characterized by further, not shown here, drainage devices, which are arranged downstream of the first and second dewatering section Il in the direction of wire sieve.
- drainage devices which are arranged downstream of the first and second dewatering section Il in the direction of wire sieve.
- FIG. 1a illustrates only the basic arrangement formed by the combination of flexible drainage elements 13.1 to 13.n with subsequent twin-wire zone 4 with the formation of a curved portion 9.1 of the drainage device 11 immediately after the infeed line E is characterized.
- FIG. 1b shows in a greatly enlarged detail view according to FIG. 1a again the two drainage sections I, II and the individual parameters, in particular angle of attack alpha, cutting angle beta.
- This basic arrangement can be modified to obtain further advantages. Such modifications are shown by way of example in FIGS. 2a to 2c.
- 1 a shows a first further development, in which, within the second dewatering section II in the direction of wire run, starting from the entry line E, a partial area 9.x within this distance b is arranged within the distance .alpha of the area 9.n of the support surface 9 of this opposite to the first wire 2, in particular the side facing away from the support surface 9 page 2.2 directly effective drainage elements 15.1 to 15.n are provided.
- These are preferably flexible on the inside 2.2 of the endlessly circulating screen belt 2 with respect to the openings 10 of the second screen belt 3, in particular inside 3.2 become effective Dewatering device 11 arranged, resiliently supported and against the first screen belt 2 positionable bars.
- the dewatering device 11 in the second screen belt 3 is designed with a support surface 9, which are formed by strip-shaped elements 19.1 to 19.n which are arranged at a distance from one another in the wire direction, the dewatering elements 15.1 to 15.n are offset therefrom, that is to say in the first screen belt 2 arranged.
- the subregion 9.x can in this case directly adjoin the partial region 9.1 describing the initial curvature of the support surface 9 or else be arranged as desired between it and the flow line A.
- the support surface 9 is preferably completely curved and characterized by a radius r or preferably a sequence of radii r 9 n to r 9 n n with n> 1.
- the decisive factor is that after the initial dewatering in the direction of the second screen belt 3, in particular the upper belt through the dewatering device 11, the dewatering in an adjoining region of the dewatering section II is forced through further dewatering elements 15.1 to 15.n in the first screen belt 2.
- the upper sieve suction box 18 In extension direction of the upper sieve suction box 18 and thus of the second dewatering section II, there is an example of this within the loop of the first sieve belt 2 arranged formation box.
- This is equipped with the individual drainage elements 15.1 to 15.n in the form of formation strips. These are positioned between the strip-shaped elements 19.1 to 19.n of the upper suction box 18 and are pressed by a corresponding means, in particular adjusting devices against the two endlessly rotating screen belts 2, 3.
- the contact pressure of the individual drainage elements 15.1 to 15.n is freely adjustable, that is, each or a plurality of these is coupled to a corresponding device for acting on a contact force, so that the contact pressure of the individual drainage elements 15.1 to 15. n can be adjusted variably with respect to the inside 2.2 of the endlessly circulating screen belt 2.
- the adjustment takes place at the individual drainage elements 15.1 to 15.n individually or in groups.
- FIG. 2b illustrates a further development of an embodiment according to FIG. 1a, in which, however, as an alternative to the embodiment according to FIG. 2a, the supporting surface 9 is already resiliently arranged in the initially curved partial region 9.1, and the drainage elements 16.1 to 16.n positionable against the first sieve belt 2 are, while in the adjoining areas 9.n no such elements are provided.
- Figure 2c illustrates a combination of the embodiment according to Figures 2a and 2b, wherein in both areas 9.1 and 9.x compliant supportable and against the first wire 2 positionable drainage elements 15.1 to 15.n and 16.1 to 16.n are provided ,
- Figures 3a to 3c illustrate in a schematically simplified representation possible embodiments of the support surface 9. These are not exhaustive.
- the support surface 9 on the dewatering device 11 is designed in such a way that the initially curved partial region 9.1, which extends from the entry line E in the wire run direction on the support surface 9, is characterized by a radius r 9 i.
- the remaining subregion 9.n can be described by a radius r 9 n .
- FIG. 3b illustrates the possibility of the embodiment of the support surface 9 in at least one of the subregions 9.1 and 9.n, here 9.1 by a plurality of radii, here by way of example the radii r 9 n to r 9 i n
- the radii r 9 n to r 9 i n differ from each other in ascending or descending order.
- FIG. 3c illustrates, by way of example, an embodiment according to FIG. 3b with a configuration of the subregion 9.n with a multiplicity of different radii r 9 n i to r 9 nn
- FIG. 3b illustrates the possibility of the embodiment of the support surface 9 in at least one of the subregions 9.1 and 9.n, here 9.1 by a plurality of radii, here by way of example the radii r 9 n to r 9 i n
- the radii r 9 n to r 9 i n differ from each other in ascending or descending order.
- FIG 4a illustrates in schematically greatly simplified representation an embodiment of the drainage device 11 according to FIG the assignment of a device 22 for generating a negative pressure and the formation of the
- Figure 4b illustrates a further development in which the negative pressure in the direction of passage at least at the successive subsections 9.1 and 9.n of the support surface 9 in Sieblaufraum by training and control of suction zones S9.1 1 to S9.1 n, S9.n1 to S9.nn each separately or in groups together adjustable.
- first and second dewatering sections are arranged and configured such that the ratio of dehydration in these dewatering sections to each other is in the range of 0.3 to 4.
- the solution according to the invention is not limited to the embodiments illustrated in FIGS. 1 a to 4 b.
- Nonwoven suspension in particular headbox
Landscapes
- Paper (AREA)
Abstract
Description
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE200910027432 DE102009027432A1 (en) | 2009-07-02 | 2009-07-02 | Forming unit and method for producing a material web |
PCT/EP2010/056054 WO2011000614A1 (en) | 2009-07-02 | 2010-05-05 | Forming unit and method for producing a material web |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2449174A1 true EP2449174A1 (en) | 2012-05-09 |
EP2449174B1 EP2449174B1 (en) | 2013-08-07 |
Family
ID=42830239
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10720288.9A Active EP2449174B1 (en) | 2009-07-02 | 2010-05-05 | Forming unit and method of manufacturing a material web |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2449174B1 (en) |
CN (1) | CN102472010B (en) |
DE (1) | DE102009027432A1 (en) |
WO (1) | WO2011000614A1 (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102010030707A1 (en) | 2010-06-30 | 2012-01-05 | Voith Patent Gmbh | Sheet forming system for a machine for producing an at least single-layer fibrous web |
DE102011080424A1 (en) * | 2011-08-04 | 2013-02-07 | Voith Patent Gmbh | Sheet forming system for a machine for producing a two- or multi-layer fibrous web |
AT13710U1 (en) * | 2012-06-19 | 2014-07-15 | Voith Patent Gmbh | Pressing device for a machine for producing a fibrous web |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3803604A (en) | 1972-07-07 | 1974-04-09 | Rca Corp | Digital tracker |
GB8307435D0 (en) | 1983-03-17 | 1983-04-27 | Beloit Walmsley Ltd | Dewatering apparatus |
FI98540C (en) * | 1989-05-08 | 1997-07-10 | Valmet Corp | Device for forming a paper or board web of fibrous material |
DE4002304A1 (en) | 1990-01-26 | 1991-08-14 | Escher Wyss Gmbh | Paper forming stretch |
DE4005420C2 (en) | 1990-02-21 | 1995-06-08 | Voith Gmbh J M | Twin wire former |
DE4219292A1 (en) * | 1992-06-12 | 1993-12-16 | Escher Wyss Gmbh | Twin wire former |
DE4326867C2 (en) | 1993-08-11 | 1997-01-30 | Voith Gmbh J M | Screen section of a machine for the production of fibrous webs |
CA2489659C (en) | 2002-08-23 | 2010-02-16 | Metso Paper, Inc. | Forming of a paper or board web in a twin-wire former or in a twin-wire section of a former |
DE102005038424A1 (en) | 2005-08-12 | 2007-02-15 | Voith Patent Gmbh | Process for producing a fibrous web and twin-wire former for carrying out the process |
DE102005047347A1 (en) | 2005-09-30 | 2007-04-12 | Voith Patent Gmbh | Method for producing a fibrous web and sheet forming system for carrying out the method |
DE102007000065A1 (en) | 2007-02-01 | 2008-08-07 | Voith Patent Gmbh | Process for producing a fibrous web and twin-wire former for carrying out the process |
-
2009
- 2009-07-02 DE DE200910027432 patent/DE102009027432A1/en not_active Withdrawn
-
2010
- 2010-05-05 WO PCT/EP2010/056054 patent/WO2011000614A1/en active Application Filing
- 2010-05-05 EP EP10720288.9A patent/EP2449174B1/en active Active
- 2010-05-05 CN CN201080029888.1A patent/CN102472010B/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2011000614A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2011000614A1 (en) | 2011-01-06 |
CN102472010A (en) | 2012-05-23 |
EP2449174B1 (en) | 2013-08-07 |
DE102009027432A1 (en) | 2011-01-05 |
CN102472010B (en) | 2015-01-28 |
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