EP0069925B1 - Siebpartie einer Papiermaschine - Google Patents

Siebpartie einer Papiermaschine Download PDF

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Publication number
EP0069925B1
EP0069925B1 EP82105865A EP82105865A EP0069925B1 EP 0069925 B1 EP0069925 B1 EP 0069925B1 EP 82105865 A EP82105865 A EP 82105865A EP 82105865 A EP82105865 A EP 82105865A EP 0069925 B1 EP0069925 B1 EP 0069925B1
Authority
EP
European Patent Office
Prior art keywords
wire
belt
headbox
section according
flow
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
Application number
EP82105865A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0069925A1 (de
Inventor
Christian Schiel
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
Application filed by JM Voith GmbH filed Critical JM Voith GmbH
Priority to AT82105865T priority Critical patent/ATE16948T1/de
Publication of EP0069925A1 publication Critical patent/EP0069925A1/de
Application granted granted Critical
Publication of EP0069925B1 publication Critical patent/EP0069925B1/de
Expired legal-status Critical Current

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Classifications

    • 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
    • D21F1/02—Head boxes of Fourdrinier machines
    • D21F1/028—Details of the nozzle section
    • 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
    • D21F1/02—Head boxes of Fourdrinier machines

Definitions

  • the invention is based on the wire section specified in the preamble of claim 1.
  • the sieve belt runs there together with the fibrous web that forms over the curved continuation of the one flow guide wall of the headbox, it is guided over the outside of the other flow guide wall of the headbox.
  • a disadvantage of this arrangement is therefore that the channel delimited by the two flow guide walls must have a relatively sharp deflection in the region of the outlet opening. Or in other words:
  • the central flow thread of the material flow has a smaller radius of curvature in the area of the outlet opening than in the web formation zone.
  • the invention has for its object to further develop the known arrangement in such a way that a fibrous web of high quality, i.e. at extremely high wire speeds. H. can be produced with a homogeneous fiber distribution.
  • the free piece can be kept particularly short by carrying out the screen support device arranged in the screen belt loop according to claim 2. Then a simple solid sieve support strip is provided, which has no drainage slots and whose radius of curvature can thus be chosen to be particularly small. Compared to a rotating roller, this design has the advantage that critical speeds are not taken into account. So you can design them regardless of the machine speed.
  • the sieve support bar is not only, as is known per se, can be pushed as a whole across the material flow (towards the outlet opening of the headbox or back) Rather, it will preferably be ensured that the displacement of the bar can be set to different sizes across the machine width.
  • the displacement of the bar can be set to different sizes across the machine width.
  • several individually adjustable threaded spindles can be provided over the length of the bar.
  • the claim 4 is based on the knowledge that the sieve belt, when entering the web formation zone, possibly transports air into the material flow which interferes with the web formation process. This danger is countered according to claim 4 in that the air in the sieve meshes can escape behind the drain line of the sieve belt from the sieve support strip when the material jet hits the meshes into the interior of the sieve belt loop.
  • the vacuum in the suction box causes the sieve belt to bend strongly.
  • the material flow is covered in the web formation zone by a flexible lip which is attached to the upper flow guide wall of the headbox. This lip bends according to the deflection of the sieve belt.
  • a disadvantage of this known design is - in addition to high energy requirements for generating the negative pressure - that the flexible lip can vibrate. This generally results in large fluctuations in the basis weight of the paper produced; there is also a risk of breakage.
  • the course of the curvature of the web formation zone can be influenced at most by changing the screen tension or the negative pressure.
  • the invention enables a certain course of the curvature to be specified precisely on the fixed sliding shoe, not only in the running direction of the sieve belt, but also transversely thereto, e.g. B. at the edges.
  • the curved slide shoe can be designed as a rigid extension of the associated current guiding wall.
  • the slide shoe will be designed to be adjustable transversely to the material flow (claim 5).
  • the sliding shoe can be allowed to protrude a little into the fabric channel and thereby adjust the size of the outlet opening in order to change the emerging mass flow.
  • the displacement path can be set to different sizes over the machine width (claim 6). In this way, the material flow can be evened out across the machine width.
  • the measure specified in claim 7 can contribute to the stabilization of the material flow in the outlet opening.
  • the sieve belt in the dewatering zone has an approximately constant curvature.
  • the average radius of curvature of the slide shoe will generally be between 100 and 800 mm, preferably between 150 and 300 mm.
  • the sieve belt In order to precisely define the end of the dewatering zone, the sieve belt should expediently be deflected slightly, at most by 5 °, by a drain edge provided at the end of the slide shoe (claim 9).
  • An overpressure chamber designed according to claim 10 can be provided for further dewatering of the fibrous web formed.
  • the air pressure in this chamber should generally be between 500 and 10,000 pascals, preferably between 2,000 and 7,000 pascals.
  • the features of claims 11 and / or 12 can advantageously be applied. It is assumed that several, for. B. two, headboxes are arranged so that at least a second fiber web layer is formed. As already mentioned above, the first fiber web layer serves as a filter auxiliary layer in the drainage of the second fiber web layer. In this process, a higher retention of fine and fillers is achieved.
  • the wire section shown in FIG. 1 has an endless wire belt 10 which runs over guide rollers 11 to 14.
  • One of the guide rolls is a regulating roll 13 and another is a tensioning roll 14.
  • a headbox is generally designated 15. In a known manner, it includes a transverse distribution pipe 16, a tube bundle 17 and an outlet duct 20 delimited by two flow guide walls 18 and 19 with an outlet opening 21.
  • the flow guide wall designated 19 has a continuation, which extends in the direction of flow beyond the outlet opening 21, in the form of a convexly curved slide shoe 22.
  • the sieve belt 10 is guided over a fixed strip 23 which is arranged in the interior of the sieve belt loop and has a convexly curved sieve support surface 24 (see FIG. 2).
  • the stream of material emerging from the outlet opening 21 reaches a web formation zone 25 which is curved and tapered in accordance with the slide shoe 22. Intensive dewatering takes place in the interior of the sieve belt loop.
  • the bar 23 is attached to a cross member 26. which rests at its two ends on a support bracket 27 and there transversely to the flow direction in the web formation zone 25, d. H. is displaceable in the direction of the outlet opening 21 or back.
  • a tub for collecting the white water is designated 28.
  • a suction box 29 can be provided for further dewatering of the paper web formed.
  • a stiffening wall 30 of the headbox 15 carrying the slide shoe 22 forms a cavity 31 together with the flow guide wall 19. This is supplied with compressed air via a connection 32, which passes through a plurality of openings 33 into an overpressure chamber 34 located behind the slide shoe 22. This is limited on the outside by a labyrinth formed from three strips 35. These strips 35 are located on a strip support 36 which is fastened to the stiffening wall 30.
  • a felt belt 37 or wire belt runs over a take-off suction roll 38. takes the paper web formed off the wire belt 10 and feeds it to further dewatering and drying devices which are not shown in the drawing.
  • the fixed sieve support bar 23, the z. B. can be made of ceramic, is attached to a strip holder 23b by means of a terminal block 23a. This is connected to the cross member 26 with the aid of a plurality of screws 41 (only one of which is visible) distributed over the length of the strip.
  • a plurality of threaded spindles 42 are provided on the cross member and distributed over its length. Each of the threaded spindles 42 extends through an eye 44 which is integrally formed on the strip holder 23b.
  • the strip holder 23b with the strip 23 can be placed more or less locally on the current-carrying wall 18 than in the area of the other spindles 42. This can compensate for any manufacturing inaccuracies.
  • the material jet After leaving the outlet opening 21, the material jet is a short distance free on the side facing the sieve belt 10 (dashed line 7 in FIG. 2). The jet of material strikes the sieve belt 10 at 8, which previously runs off the bar 23 at 9.
  • the distance between the bar 23 and the end of the flow guide wall 18 will be set as small as possible so that the length of the free jet of material, that is the distance from the outlet opening 21 until the jet of material hits the screen belt 10, is as small as possible.
  • the radius of curvature k of the bar 23 is generally less than 100 mm, which also contributes to the shortening of the free material jet.
  • the slide shoe 22 is fastened to a plurality of adjustment rods 45 arranged distributed over its length. Only one of these rods 45 is visible in the drawing. They rest in bores 46 of the stiffening wall 30 and are axially displaceable in them, i. H. towards the outlet opening 21 or back.
  • An adjusting nut 47 is rotatably mounted on each adjusting rod 45 and engages with an external thread in a threaded bore of the sealing strip carrier 36. The adjusting nuts 47 can be rotated individually. As a result, the displacement path of the slide shoe 22 can be set to be different in size over the machine width.
  • the movable slide shoe 22 touches the end of the flow guide wall 19 on a sealing surface 48. This, viewed in the direction of flow, lies in front of the end of the flow guide wall 18, that is to say in front of the outlet opening 21. Thus, by adjusting the slide shoe 22, the clear width of the outlet opening 21 and so that the emerging volume flow can be changed.
  • the curved surface of the sliding shoe 22 touched by the material flow can advantageously be designed as follows: in the area of the outlet opening 21 it is flat or only slightly curved with a very large radius of curvature K. This is followed by an area with a relatively large curvature (radius of curvature r ) and finally an area with again weaker curvature (radius of curvature R).
  • a sharp trailing edge is also indicated at 50 on the slide shoe 22, and also a Tagente placed there on the curved surface with t.
  • the Screen belt 10 is preferably guided such that it includes an angle a of approximately 0.5 to 5 ° with the tangent t; measured with the machine stationary with the sieve belt 10 tensioned.
  • FIG. 1 the headbox 15 is arranged vertically with the outlet opening 21 below. Instead, however, any other positions are possible.
  • 3 shows a wire section with two headboxes.
  • the first headbox 15a is arranged horizontally and the second headbox 15b as in FIG. 1 vertically.
  • the two headboxes 15a and 15b differ by different sliding shoes 22a and 22b.
  • the curved surface of the slide shoe 22a is relatively short and only slightly curved. Accordingly, the material flow in the web formation zone is deflected by only about 45 °.
  • the slide shoe 22b of the second headbox 15b has a longer curved surface with a greater curvature.
  • the relatively large, average radius of curvature in the web formation of the first fiber layer is intended to achieve the lowest possible dewatering speed.
  • the fibers are less strongly washed into the mesh, so that at the end of the wire section the fiber web can be more easily removed from the wire.
  • fewer fine and fillers are swept through the sieve belt.
  • each headbox 15a, 15b is assigned a separate white water pan 28a or 28b. From each of these tubs, a white water line 51a or 51b leads into a white water tank 52a or 52b.
  • the circulation pump 53a conveying to the first headbox 15a (via the line 54a) is connected on the suction side to the white water tank 52b and accordingly the other circulation pump 53b (with pressure line 54b) to the white water tank 52a.
  • the circulation pump 53a conveying to the first headbox 15a (via the line 54a) is connected on the suction side to the white water tank 52b and accordingly the other circulation pump 53b (with pressure line 54b) to the white water tank 52a.
  • the circulation pump 53a conveying to the first headbox 15a (via the line 54a) is connected on the suction side to the white water tank 52b and accordingly the other circulation pump 53b (with pressure line 54b) to the white water tank 52a.
  • the other circulation pump 53b with pressure line 54b
  • FIG. 4 shows a wire section for producing a three-layer fibrous web.
  • the three headboxes 15 ', 15 "and 15”' are in turn the same except for the differently shaped sliding shoes 22 ', 22 ", 22"'.
  • the seal supports 36 on the headboxes with the sealing strips 35 are not attached to a separate cross member, but at the end of a suction box 29' or 29 ". This reduces the construction effort.
  • 3 and 4 can be provided to make the individual headboxes pivotable so that they can be easily lifted off the screen belt and that, if necessary, for. B. can drive less with a headbox without the shoe touching the screen belt.
  • the paper web can be removed from the screen belt - instead of using the suction roller 38 (FIG. 1) - by means of a strip or smooth roller (“lick-up”) or a suction box, or finally by means of a blow box.
  • the belt is driven by one or more of the wire guide rollers 11 to 14 (Fig. 1).
  • the wire tension should be in the usual range between 3 and 10 kN / m.
  • a wire section according to one of claims 1 to 13 can also be combined with one of the known web forming units, for example with a conventional wire forming section or a suction breast roller or a twin wire former. 1 (or more), preferably together with the components 23 and 26 to 29, can be arranged in the wire running direction in front of the known web forming unit.
  • a twin wire former the arrangement could be such that a headbox 15 according to FIG. 1, but essentially with the flow direction from bottom to top, is placed in front of the twin wire zone on the wire belt which is approaching in the direction from bottom to top of the twin wire zone .

Landscapes

  • Paper (AREA)
  • Medicines Containing Material From Animals Or Micro-Organisms (AREA)
  • Medicines Containing Antibodies Or Antigens For Use As Internal Diagnostic Agents (AREA)
  • Drying Of Solid Materials (AREA)
EP82105865A 1981-07-16 1982-07-01 Siebpartie einer Papiermaschine Expired EP0069925B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82105865T ATE16948T1 (de) 1981-07-16 1982-07-01 Siebpartie einer papiermaschine.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3128156 1981-07-16
DE3128156A DE3128156C2 (de) 1981-07-16 1981-07-16 Siebpartie einer Papiermaschine

Publications (2)

Publication Number Publication Date
EP0069925A1 EP0069925A1 (de) 1983-01-19
EP0069925B1 true EP0069925B1 (de) 1985-12-11

Family

ID=6137078

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82105865A Expired EP0069925B1 (de) 1981-07-16 1982-07-01 Siebpartie einer Papiermaschine

Country Status (8)

Country Link
US (1) US4416730A (enrdf_load_html_response)
EP (1) EP0069925B1 (enrdf_load_html_response)
JP (1) JPS5823985A (enrdf_load_html_response)
AT (1) ATE16948T1 (enrdf_load_html_response)
BR (1) BR8203666A (enrdf_load_html_response)
DE (1) DE3128156C2 (enrdf_load_html_response)
FI (1) FI822522A7 (enrdf_load_html_response)
SU (1) SU1123543A3 (enrdf_load_html_response)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3277879D1 (en) * 1981-11-10 1988-02-04 Moelnlycke Ab Web forming method and device
AT376722B (de) * 1983-02-09 1984-12-27 Andritz Ag Maschf Entwaesserungsmaschine fuer zellstoff od. dgl. fasermaterial
SE441195B (sv) * 1984-04-10 1985-09-16 Moelnlycke Ab Anordning for formning av en fiberbana
US4861432A (en) * 1987-11-03 1989-08-29 Huyck Corporation Dual compartment vacufoil unit to eliminate secondary headbox chatter
US4780183A (en) * 1987-11-03 1988-10-25 Huyck Corporation Method of using a dual compartment vacufoil unit to eliminate secondary headbox chatter
GB8903517D0 (en) * 1989-02-16 1989-04-05 Beloit Corp A forming apparatus for forming a web from stock
GB8906275D0 (en) * 1989-03-18 1989-05-04 Beloit Corp Web former
FI934697L (fi) * 1992-11-05 1994-05-06 Voith Gmbh J M Inloppslaoda foer en pappersmaskin med en modifierbar underlaepp
US6117271A (en) * 1998-04-15 2000-09-12 Beloit Technologies, Inc. Slice lip apparatus
JP3297661B2 (ja) 2000-02-02 2002-07-02 株式会社ヤマダコーポレーション 高粘度流体圧送用ポンプ装置
FI20075452A7 (fi) * 2007-06-15 2008-12-16 Upm Kymmene Corp Menetelmä ja laitteisto paperin valmistamiseksi
JP4887311B2 (ja) * 2008-01-30 2012-02-29 Ｙｋｋ Ａｐ株式会社 面材支持構造および建具

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2718824A (en) * 1951-10-25 1955-09-27 Beloit Iron Works Headbox for paper making machine
US3132990A (en) * 1962-10-19 1964-05-12 Diamond National Corp Paper making apparatus
US3582467A (en) * 1968-06-25 1971-06-01 Beloit Corp Two wire former
DE2552485A1 (de) * 1975-11-22 1977-06-02 Voith Gmbh J M Zylindrische fuehrungsvorrichtung fuer faserstoffbahnen
CA1073718A (en) * 1977-09-12 1980-03-18 Dominion Engineering Works Limited Twin wire free loop web former
DE2754622C3 (de) * 1977-12-08 1981-08-06 J.M. Voith Gmbh, 7920 Heidenheim Naßpartie einer Papiermaschine
DE2908791C3 (de) * 1979-03-07 1981-08-13 J.M. Voith Gmbh, 7920 Heidenheim Bahnbildungsabschnitt der Siebpartie einer Papiermaschine

Also Published As

Publication number Publication date
JPS5823985A (ja) 1983-02-12
FI822522L (fi) 1983-01-17
ATE16948T1 (de) 1985-12-15
EP0069925A1 (de) 1983-01-19
FI822522A7 (fi) 1983-01-17
DE3128156A1 (de) 1983-01-27
JPH0210277B2 (enrdf_load_html_response) 1990-03-07
SU1123543A3 (ru) 1984-11-07
FI822522A0 (fi) 1982-07-15
DE3128156C2 (de) 1985-01-24
BR8203666A (pt) 1983-06-21
US4416730A (en) 1983-11-22

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