EP0403577B1 - Doppelsieb-former und verfahren zur herstellung einer faserstoffbahn - Google Patents

Doppelsieb-former und verfahren zur herstellung einer faserstoffbahn Download PDF

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Publication number
EP0403577B1
EP0403577B1 EP89905672A EP89905672A EP0403577B1 EP 0403577 B1 EP0403577 B1 EP 0403577B1 EP 89905672 A EP89905672 A EP 89905672A EP 89905672 A EP89905672 A EP 89905672A EP 0403577 B1 EP0403577 B1 EP 0403577B1
Authority
EP
European Patent Office
Prior art keywords
wire
twin
roll
zone
suction
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.)
Expired - Lifetime
Application number
EP89905672A
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German (de)
English (en)
French (fr)
Other versions
EP0403577A1 (de
Inventor
Wilfried Kraft
Rudolf BÜCK
Albrecht Meinecke
Werner Kade
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
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Publication date
Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Priority to AT89905672T priority Critical patent/ATE85659T1/de
Publication of EP0403577A1 publication Critical patent/EP0403577A1/de
Application granted granted Critical
Publication of EP0403577B1 publication Critical patent/EP0403577B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F9/00—Complete machines for making continuous webs of paper
    • D21F9/003—Complete machines for making continuous webs of paper of the twin-wire type

Definitions

  • the invention relates to a twin-wire former for producing a fibrous web, in particular paper web, in particular with the features specified in the preamble of claim 1.
  • the invention also relates to a method for producing a fibrous web by means of such a twin wire former.
  • a twin-wire former is known under the name "Bel Baie III” (Preprints “B”, 74th Annual Meeting, Technical Section, Canadian Pulp and Paper Association, p. B286-B289), see also FR-A-2131765. It essentially has the following structure: Two breast rollers guide two sieve belts from bottom to top in an essentially vertical twin-wire zone. The two screens converge towards one another in the area of a curved stationary support device which is arranged directly above one of the two breast rollers. A headbox arranged below the breast rollers conveys a stream of material into the inlet gap formed by the two screens. The material jet then forms a fibrous web in the twin-wire zone.
  • the screen guide surface of the stationary support device has water discharge openings, at least some of which can be connected to a vacuum source.
  • a forming roller designed as a suction roller is arranged behind the curved support device in the direction of wire travel. This forming roller and the curved support device are both within the same screen loop.
  • At least one deflector is arranged in the other sieve loop for removing the water which has penetrated through the mesh of the sieve in the region of the curved support device.
  • the known arrangement has the following special features: the forming roller and the stationary support device lie in the loop of the second screen.
  • the two screens separate in the upper area of the circumference of the forming roller. This is done in that the drainage point of the first screen lies in the web running direction before the drainage point of the second screen.
  • the second screen then runs together with the fibrous web formed over a screen suction roll, where additional dewatering is to take place, and to the usual take-off point.
  • the formation of the fibrous web should start as gently as possible despite the high working speed. Due to the simultaneous dewatering on both sides, the fibrous web formed, preferably paper web, should have the same possible properties on both sides (ie low two-sidedness). At the same time, the paper quality is to be increased by the fact that as little fiber and fillers as possible are lost during dewatering (ie the highest possible retention).
  • twin-wire zone is curved in only one direction. This means that there is no counter-curvature, e.g. is present in the S-shaped curved twin-wire zone of FIG. 2 of US Pat. No. 3,876,499. This creates the risk of a certain two-sidedness of the finished paper web; i.e. that the finished paper web does not have the same properties on both sides to the required extent.
  • twin-wire former Another disadvantage of the known twin-wire former is that the separation of the two wires takes place before the wire suction roll, that is, at a point where the paper web formed still has a relatively low dry content.
  • the first screen when separated from the paper web, tends to forcefully remove many fibers from the paper web that is formed (and continues with the second screen). This in turn affects the quality of the finished paper web.
  • the invention is based on the task to improve the known twin-wire former so that the web formation - despite the highest possible working speed - at the beginning of Double sieve zone can take place even more gently than before in order to achieve the highest possible retention and to counter the risk of pinholes.
  • the aim is to eliminate the risk of perforated shadow marking on the forming roller.
  • the fibrous web should have a higher dry content than previously, in order to counteract the risk of fibers being torn out of the fibrous web.
  • twin-wire former according to the invention that the curved stationary support device and the forming roller are no longer arranged in the loop of the second but the first wire and that the twin-wire zone also extends over the wire suction roll, preferably from the periphery of the wire suction roll about half of both seven is wrapped.
  • Another essential feature of the twin-wire former according to the invention is the water storage volume of the jacket of the forming roller which is increased many times over. As is known per se (DE-PS 32 10 320), this is achieved in that an additional grid-shaped outer jacket is arranged on the perforated roller body, preferably in the form of a honeycomb cover.
  • the zone of the main drainage ie the zone of web formation, in which part of the fiber material is still in the form of a suspension
  • the drainage on the curved stationary support device can start much more slowly than before.
  • This can be controlled according to claim 8 by varying the negative pressure in the stationary support device and or by varying the tension of the sieves. (Result: higher retention, no or much fewer pinholes as before).
  • the formation of the web is then continued - due to the smaller radius of curvature of the forming roller - in its wrapping zone with a much higher intensity than before, so that the web formation is completed at the latest at the end of the wrapping zone.
  • This can in turn be controlled according to claim 8 by the measures already mentioned above and additionally by varying the negative pressure in the forming roller.
  • the greatly increased water storage capacity of the forming roller is important. This not only significantly increases their drainage performance, but also completely eliminates the risk of the shadow shadow marking occurring in the paper web.
  • the forming roller is arranged in the same screen loop as the stationary support device and immediately behind it, and that at least one deflector is provided in the other screen loop in the area of the stationary support device for bundled water removal.
  • the first-mentioned feature saves a lot of space, in particular in view of the fact that in many cases a deflector (with a large supporting body cross section) must be arranged in the other sieve loop exactly where the sieves have left the stationary support device. If one also wanted to arrange the forming roller in the other wire loop, then a very large distance from the stationary support device would have to be kept (in order not to collide with the deflector). The result would be: increased space requirements and a long unsupported wire run with the risk of disturbed web formation.
  • twin-wire former results from the fact that the majority of the suction zone on the wire suction roll is covered not only by one wire, but by two wires: this significantly reduces the noise
  • the twin-wire zone now has an S-shaped course. This counteracts the risk of a certain two-sidedness of the finished paper web; i.e. it is possible to ensure the same properties on both sides of the paper web with greater certainty than before.
  • twin wire former (under the name “Papriformer”) is already known, in which two suction rolls in an S-shaped twin wire zone are connected in series.
  • Papriformer a twin wire former
  • other essential features of the twin-wire former according to the invention are missing, in particular the curved stationary support device provided at the beginning of the twin-wire zone and the substantially increased water storage capacity of the first suction roller (same as forming roller) (achieved by the additional lattice-shaped outer jacket mentioned).
  • a twin-wire former is known, which is formed in that a top wire is placed on a conventional wire. The material is fed from top to bottom.
  • a stationary curved support device is arranged one after the other, further dewatering elements behind it and finally a forming roller.
  • the twin-wire zone according to FIG. 1 is then curved in the other direction by a second forming roller arranged in the lower wire.
  • Both forming rollers can be designed as suction rollers.
  • the second forming roller is wrapped only about one eighth of its circumference by the two wire belts. Behind the second forming roller both sieve belts run over some suction boxes.
  • the top wire separates from the paper web now formed and from the bottom wire. The latter guides the paper web over at least one further suction box and over a sieve suction roll to a take-off point.
  • the stationary support device of the US-PS has a relatively large and the first forming roller a relatively small radius of curvature. This in turn is intended to ensure that the formation of the fibrous web begins as gently as possible. After that, i.e. in the area of the smaller radius of curvature, the drainage is then forced. According to column 4, the dryness behind the second forming roller is "at least 1.5%". From this relatively low value it can be concluded that in the area between the two forming rolls, ie where the curvature is reversed, part of the fiber material is still in the form of a suspension; i.e. part of the fiber is still floating in the water. This has a very unfavorable effect on the further formation of the fibrous web.
  • Another disadvantage of the known construction is the fact that the arrangement of the aforementioned suction boxes in the manner of a conventional fourdrinier wire takes up a lot of space.
  • the design according to the invention takes up much less space. This is achieved on the one hand by the fact that the forming roller is arranged directly (ie at a very short distance) behind the stationary support device and on the other hand that after the formation of the web, the further dewatering takes place exclusively on the sieve suction roller wrapped by the two sieves.
  • FIG. 1 shows a headbox 10, two endless sieve belts, namely a first sieve 11 and a second sieve 12, each of which is guided into a twin-wire zone by means of a breast roller 13 and 14.
  • the two screens 11 and 12 first run over a curved stationary support device 15 (with a very large radius of curvature) and immediately afterwards over a forming roller 16 (with a relatively small radius of curvature).
  • These two elements 15 and 16 as well as a suction box 17, which can also be designed as a deflector, are all located within the loop of the first screen 11. Then the two screens run over a screen suction roller 18 located in the loop of the second screen 12.
  • twin-wire former is shown in a preferred arrangement, in which the outflow direction of the headbox 10 and the direction of the wires 11 and 12 run approximately vertically from bottom to top in the initial region of the twin-wire zone.
  • other arrangements are also possible (see Figure 3).
  • the curved stationary support device 15 can be divided into two separate drainage boxes 15a and 15b. Each of these boxes has a curved screen guide surface formed from different strips 25. There are slots 26 between the strips, through which part of the water is removed.
  • the lower drainage box 15a can be divided into a lower and an upper area by means of an intermediate wall 45, only the upper area having a suction connection 46 which leads to a vacuum source V.
  • the upper drainage box 15b is formed uniformly as a suction box. Lateral water outlets are labeled 47. The distance A between the upper end of the upper drainage box 15b and the point where the screens 11, 12 run onto the forming roller is relatively small. Furthermore, it can be seen from FIG.
  • a honeycomb cover 27 is arranged on the roller body 16a of the forming roller 16 and is composed of upright strips or bleaching strips. This honeycomb cover forms an additional lattice-shaped outer jacket that has large-volume cells that are open in the radial direction; that is, these cells are open to both the screen 11 and the bores of the roller body 16a.
  • a fabric jacket is arranged on the surface of the honeycomb train 27, in the form of a coarse-mesh screen fabric 28.
  • the thickness d of the material jet leaving the headbox 10 and the distance a between the two screens 11 and 12 are exaggerated.
  • the end of the zone in which the two sieves converge can, for example, be approximately in the middle of the looping zone of the forming roller 16, as is shown only by way of example in FIG. 2.
  • the end of the sieve convergence is symbolically represented there by the point E; there the dry matter content of the paper web has reached approximately 8%.
  • Deflectors 29, 30, 31 serve to strip off water which has penetrated through the mesh of the second sieve 12.
  • a deflector 29 is arranged where the two sieves 11 and 12 are unsupported from the lower (15a) to the upper (15b) drainage box to run.
  • Another deflector 31 is arranged where the two screens 11 and 12 run unsupported from the upper dewatering box 15b to the dewatering roller 16.
  • Another deflector 30 can be arranged in the lower region of the lower drainage box 15a.
  • the deflectors are important in order to remove the water penetrating through the mesh of the second sieve 12 as early as possible in the initial region of the double sieve zone, so that the subsequent dewatering through the second sieve 12 can take place unhindered.
  • the deflectors bundle the water, ie remove it in the form of water jets that are as compact as possible. This counteracts the tendency that (at the desired very high working speed, order of magnitude approx. 1500 m / min).
  • the deflectors 29, 30, 31 are pivotally mounted and can therefore be more or less attached to the second screen 12 can be employed.
  • the water thrown off in the looping zone of the forming roller 16 is collected and removed by means of a deflection plate 50.
  • the screen suction roller 18 has at least two suction zones 18a and 18b.
  • a first large suction zone 18a is located in the area which is surrounded by two screens 11 and 12.
  • a smaller suction zone 18b in which a generally higher vacuum is set, is located behind the point where the first screen 11, guided by one of the screen guide rollers 21, stands out from the paper web 9 formed.
  • the entire suction device can also be divided into three suction zones. Scrapers that remove water and any material particles from the rollers 13, 14 and 21 are designated 33, 34 and 41 in FIG.
  • FIGS. 1 and 2 in which the screens 11, 12 run essentially from bottom to top in the web formation zone, is preferred for various reasons: the stock feed to the headbox 10 is much simpler than e.g. in the arrangement according to US Pat. No. 3,876,499.
  • the water emerging from the sieves 11 and 12
  • the stationary support device 15 the water (emerging from the sieves 11 and 12) is initially discharged in a predominantly horizontal direction relatively evenly on both sides. This reinforces the tendency towards a high uniformity of the initial web formation on the two screens and thus towards a uniformity of the paper properties on the top and bottom.
  • the invention can also be implemented with predominantly horizontal guidance of the screens 11 ', 12' in the web formation zone.
  • the first sieve 11 ' can here as “Upper sieve” and the second sieve 12 'are referred to as “lower sieve”.
  • the stationary support device 15 ' is provided with a (known per se) water lifting device 48.
  • the wrapping zone and thus also the suction zone 16b
  • the elements of Figure 3 are essentially the same as those of Figures 1 and 2 and therefore provided with the same reference numerals.

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EP89905672A 1988-05-06 1989-05-05 Doppelsieb-former und verfahren zur herstellung einer faserstoffbahn Expired - Lifetime EP0403577B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89905672T ATE85659T1 (de) 1988-05-06 1989-05-05 Doppelsieb-former und verfahren zur herstellung einer faserstoffbahn.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3815470 1988-05-06
DE3815470A DE3815470A1 (de) 1988-05-06 1988-05-06 Doppelsieb-former

Publications (2)

Publication Number Publication Date
EP0403577A1 EP0403577A1 (de) 1990-12-27
EP0403577B1 true EP0403577B1 (de) 1993-02-10

Family

ID=6353791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89905672A Expired - Lifetime EP0403577B1 (de) 1988-05-06 1989-05-05 Doppelsieb-former und verfahren zur herstellung einer faserstoffbahn

Country Status (8)

Country Link
US (1) US5141600A (ja)
EP (1) EP0403577B1 (ja)
JP (1) JPH03501632A (ja)
BR (1) BR8907393A (ja)
CA (1) CA1317141C (ja)
DE (2) DE3815470A1 (ja)
FI (1) FI903553A0 (ja)
WO (1) WO1989011000A1 (ja)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4002304A1 (de) * 1990-01-26 1991-08-14 Escher Wyss Gmbh Former in einer papiermaschine
DE4014403C2 (de) * 1990-05-04 1994-03-10 Escher Wyss Gmbh Vertikalformer
DE4102065C2 (de) * 1991-01-24 1996-02-01 Voith Sulzer Papiermasch Gmbh Doppelsiebformer
DE4105215C2 (de) * 1991-02-20 1996-10-17 Voith Gmbh J M Sieb-Formerpartie
FI93032C (fi) * 1991-03-15 1995-02-10 Valmet Paper Machinery Inc Paperikoneen kaksiviirainen rainanmuodostusosa
DE4117597A1 (de) * 1991-05-29 1992-12-03 Voith Gmbh J M Doppelsiebformer fuer eine papiermaschine
FI93128C (fi) * 1991-07-19 1995-02-27 Tampella Papertech Oy Paperikoneen kaksiviirainen rainanmuodostusosa
DE9212448U1 (de) * 1992-09-16 1992-11-05 J.M. Voith Gmbh, 7920 Heidenheim Doppelsiebformer mit örtlich verstellbarer Entwässerungsleiste
FI109299B (fi) 2001-01-22 2002-06-28 Metso Paper Inc Kaksiviiraformeri
BRPI0621781B1 (pt) * 2006-08-10 2016-09-06 Metso Paper Karlstad Ab unidade para seção formadora em máquina de fabricação de papel, seção formadora em máquina de fabricação de papel, e método para montar uma seção formadora de dupla tela de uma máquina de fabricação de papel

Family Cites Families (16)

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Publication number Priority date Publication date Assignee Title
FI72544C (fi) * 1975-06-13 1987-06-08 Valmet Oy Formare med tvao viror i pappersmaskin.
CA929772A (en) * 1970-01-26 1973-07-10 Enso-Gutzeit Osakeyhtio Method and apparatus for the manufacturing of paper, cardboard and the like fibrous material web
CA960496A (en) * 1971-03-25 1975-01-07 Beloit Corporation Vertical twin wire web forming arrangement
US3726758A (en) * 1971-07-08 1973-04-10 J Parker Twin-wire web forming system with dewatering by centrifugal forces
BE789468A (fr) * 1971-10-06 1973-01-15 Beloit Corp Structure a deux toiles submergee pour formation de feuille continue
US3839143A (en) * 1972-06-08 1974-10-01 Beloit Corp Multi-ply two wire former wherein multiple headboxes are used and inflatable air bellows provide adjustments therebetween
US3821076A (en) * 1973-01-11 1974-06-28 Karlstad Mekaniska Ab Forming roll for twin wire papermaking with axially aligned wave-shaped ribs
FI313874A (ja) * 1974-10-25 1976-04-26 Valmet Oy
SE7507159L (sv) * 1975-06-23 1976-12-24 Karlstad Mekaniska Ab Anordning for framstellning av en fiberbana
US4125428A (en) * 1977-06-27 1978-11-14 The Black Clawson Company Vertical twin wire paper machine
JPS5450609A (en) * 1977-09-28 1979-04-20 Ishikawajima Harima Heavy Ind Double screen type paper making machine
LU81706A1 (fr) * 1978-09-22 1980-01-24 Ass Eng Ltd Joints d'etancheite interfaciaux a jeu positif
AT379622B (de) * 1980-11-26 1986-02-10 Escher Wyss Gmbh Papiermaschine mit zwei beweglichen wasserdurchlaessigen entwaesserungsbaendern, z.b. sieben
US4532008A (en) * 1983-07-22 1985-07-30 The Black Clawson Company Horizontal twin wire machine
WO1987006637A1 (en) * 1986-04-30 1987-11-05 Beloit Corporation A web forming apparatus
DE8806036U1 (de) * 1988-05-06 1988-06-23 J.M. Voith Gmbh, 7920 Heidenheim Doppelsieb-Former

Also Published As

Publication number Publication date
FI903553A0 (fi) 1990-07-13
US5141600A (en) 1992-08-25
DE58903539D1 (de) 1993-03-25
WO1989011000A1 (en) 1989-11-16
DE3815470A1 (de) 1989-11-16
EP0403577A1 (de) 1990-12-27
JPH03501632A (ja) 1991-04-11
CA1317141C (en) 1993-05-04
BR8907393A (pt) 1991-04-23

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