EP0486814B1 - Nassteil einer Doppelsieb-Papiermaschine - Google Patents
Nassteil einer Doppelsieb-Papiermaschine Download PDFInfo
- Publication number
- EP0486814B1 EP0486814B1 EP91117629A EP91117629A EP0486814B1 EP 0486814 B1 EP0486814 B1 EP 0486814B1 EP 91117629 A EP91117629 A EP 91117629A EP 91117629 A EP91117629 A EP 91117629A EP 0486814 B1 EP0486814 B1 EP 0486814B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire
- twin
- making machine
- machine according
- paper
- 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
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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
Definitions
- the invention relates to the wet part of a twin-wire paper machine according to the preamble of claim 1.
- Such machines are generally used to produce a paper or cardboard web, which is formed by dewatering a fiber suspension between two screens.
- US Pat. No. 4,925,531 shows a known twin-wire former of this type, in which a paper web is formed by direct introduction of the suspension jet from the headbox into the space formed when the two wires come together. The water passing through the top sieve is thrown into a water container due to the centrifugal force of the water. This procedure requires relatively high speeds and paper webs that are not too thick.
- twin-wire paper machines As is known, there are a very large number of different designs of twin-wire paper machines.
- the patent specification of the applicant DE 31 38 133 C2 schematically shows paper machines in FIGS. 1, 2 and 3, in which the production of a paper or cardboard web is made possible with the aid of a bottom and top screen.
- German laid-open specification 39 10 892 A2 shows the formation area of a twin-wire paper machine with a forming roller in the lower wire and an area of the twin wire running upwards over a curved forming shoe.
- twin-wire paper machines of this type have the disadvantage that the range in which they can be operated is limited by the fact that such machines cannot be operated at speeds below a certain limit and then only with relatively low basis weights, for example Newsprint.
- Such known machines have the property that the centrifugal force occurring at the forming roll at speeds, in particular below 500 m / per minute, is too low to fling the water sufficiently upwards and to remove it in the collecting channel provided for this purpose. This is further complicated by the fact that such machines have an increasing profile of the sieves in the machine running direction.
- L / Q tear length ratio
- Another paper machine does not have a forming roller in the lower wire. Furthermore, the first suction box is arranged to rise in the bottom wire viewed in the machine running direction. This allows the water passing through the top wire to run back against the machine direction, especially at low machine speeds. There is no upper apex of the bottom wire in the front area of the sheet formation here either.
- the invention has for its object to provide a twin-wire paper machine that can be used in a wide speed range and with a wide variety of basis weights.
- the former is intended for web weights of between 30 and 300 g / per square meter and at speeds of 200 can be used up to over 1000 m / per minute.
- the solution to this problem is achieved in full by the measures mentioned in the characterizing part of claim 1.
- the wet part of the paper machine is designed in such a way that in the area of the twin-wire loop forming on the forming roll, a favorable formation takes place with effective dewatering of the web.
- the geometric conditions in this area such as the relatively large wrap angle of the forming roller through both screens of approximately 45 ° and the rapid, unimpeded water drainage play a positive role. This is achieved when the forming section arranged after the forming roller leads downwards at least partially following gravity.
- the losses in the flow caused by the boxes in the lower and upper sieves are compensated for by the fact that the suspension between the sieves is accelerated by gravity.
- both screens are either guided horizontally, falling or slightly rising over one or more curved surfaces, the web being further formed by the suction effect of the at least one suction box in the bottom wire and the vacuum suction box in the top wire.
- the forming roller 1 represents an important exemplary embodiment of the wet part of a paper machine according to the invention, here with a headbox 10 from which a material suspension jet emerges, which passes directly between the two merged screens, top screen 8, bottom screen 9.
- the forming roller 1 is wrapped in a region by both sieves, in a region in front of it only by the lower sieve 9. Both screens from the forming roller run in the upper right area.
- the forming roller can have a grill structure which is attached to a closed jacket body. The white water can be stored and then centrifugally thrown off the roller.
- the forming roller can also be designed as a suction roller.
- the radius of the forming roller can be between 0.3 and 1 m.
- both screens 8 and 9 are transported horizontally, falling or slightly rising via a suction box 2 - or even several - with, for example, a curved surface provided with transverse strips.
- the radius of curvature here is between 2 and 20 m.
- the suction box has a straight piece, for example in the last part, so that the directional reversal of the two screens is as gentle as possible without the fleece or the web being damaged.
- the open area of the box can be between 20 and 80%.
- the boxes can be covered with strips Machine width and / or be provided with a hole pattern.
- the vacuum suction box 4 in the top sieve consists of several chambers that can be acted upon differently by vacuum.
- An inclination, as shown here, falling in the running direction, of the box 4 facilitates the water drainage in the initial area of this suction box, especially at low machine speeds of e.g. 200 m / minute.
- centrifugal action above the suction box 2 located in the lower sieve allows water to be easily removed by means of individual, additional top suction devices 3.
- separating element 5 Behind the vacuum box 4 is a separating element 5, which in the case shown in FIG. 1 is a curved box with strips extending across the width, with a radius of curvature between 1.5 and 20 m. In other cases, however, this box can also be straight and can be subjected to negative pressure. A register roller is also conceivable as the separating element 5.
- Fig. 2 shows very schematically and without details another possible course of the merged screens between the forming roller 1 and the vacuum box 4, the contour of the suction box 2 first having a slightly rising and then a more sloping shape.
- Fig. 3 shows that suction boxes 2 and vacuum suction box 4 can not only have curved, but also straight contours of the surfaces touched by the screens, whereby a particularly gentle drainage and thus favorable formation, especially with relatively heavy web weights, can be achieved. It is possible, as shown here, to first choose the flat and then the curved shape on the surface of the suction boxes that comes into contact with the screen, but the reverse order can also be advantageous, depending on the requirements and geometric conditions.
- FIG. 4 shows a further example of an arrangement with a suction box 2 'located in the lower sieve, which has a curved shape on the surface in contact with the sieve and which is followed by a second suction box 2' 'with a surface straight to the sieve.
- the vacuum box 4 located in the upper sieve is divided into several areas, namely 4 'and subsequently 4' ', which are subjected to different negative pressures and are provided with an upstream extra suction device 4' ''.
- FIGS. 5 and 6 are provided with a four-wire section located before the two screens 8 and 9 are brought together.
- the headbox 10 is located at the beginning of this Fourdrinier section which contains part of the lower wire 9.
- Such arrangements are also called hybrid formers.
- a deflecting roller located in the front of the top wire can also be formed as a forming cylinder 11, as shown in FIG. 6.
Landscapes
- Paper (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Medicines That Contain Protein Lipid Enzymes And Other Medicines (AREA)
- Orthopedics, Nursing, And Contraception (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4037017A DE4037017C2 (de) | 1990-11-20 | 1990-11-20 | Naßteil einer Doppelsieb-Papiermaschine |
DE4037017 | 1990-11-20 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0486814A1 EP0486814A1 (de) | 1992-05-27 |
EP0486814B1 true EP0486814B1 (de) | 1996-05-29 |
Family
ID=6418641
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91117629A Expired - Lifetime EP0486814B1 (de) | 1990-11-20 | 1991-10-16 | Nassteil einer Doppelsieb-Papiermaschine |
Country Status (8)
Country | Link |
---|---|
US (1) | US5282933A (ja) |
EP (1) | EP0486814B1 (ja) |
JP (1) | JPH04263692A (ja) |
AT (1) | ATE138703T1 (ja) |
CA (1) | CA2055837A1 (ja) |
DE (2) | DE4037017C2 (ja) |
ES (1) | ES2087204T3 (ja) |
FI (1) | FI112386B (ja) |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4117597A1 (de) * | 1991-05-29 | 1992-12-03 | Voith Gmbh J M | Doppelsiebformer fuer eine papiermaschine |
US5573643A (en) * | 1992-01-17 | 1996-11-12 | Valmet Corporation | Twin wire web former in a paper machine |
FI920228A0 (fi) * | 1992-01-17 | 1992-01-17 | Valmet Paper Machinery Inc | Banformningsparti foer pappersmaskin. |
DE4208681A1 (de) * | 1992-03-18 | 1993-09-23 | Escher Wyss Gmbh | Nassteil einer doppelsieb-papiermaschine |
DE4219292A1 (de) * | 1992-06-12 | 1993-12-16 | Escher Wyss Gmbh | Doppelsiebformer |
CA2142262C (en) * | 1992-08-19 | 1999-05-25 | Paul T. Gray | A multi-ply web forming apparatus |
DE4301751C2 (de) * | 1993-01-23 | 1996-10-31 | Voith Gmbh J M | Verfahren zum Ablösen einer laufenden Faserstoffbahn von zwei endlosen Siebbändern |
DE4328024A1 (de) * | 1993-08-20 | 1995-02-23 | Voith Gmbh J M | Doppelsieb-Blattbildner |
DE4332162C2 (de) * | 1993-09-22 | 1994-12-01 | Voith Gmbh J M | Doppelsiebformer einer Papiermaschine |
DE4335304C2 (de) * | 1993-10-16 | 1995-04-20 | Voith Gmbh J M | Verfahren zum Betreiben eines Doppelsiebformers |
FI100542B (fi) * | 1993-11-12 | 1997-12-31 | Valmet Paper Machinery Inc | Paperikoneen hybridiformeri, joka on varustettu MB-yksiköllä |
FI105934B (fi) * | 1994-06-17 | 2000-10-31 | Valmet Paper Machinery Inc | Paperikoneen hybridiformerin kaksiviiravyöhykkeen sisäänmeno |
DE4443874C2 (de) * | 1994-12-09 | 1996-10-31 | Voith Sulzer Papiermasch Gmbh | Doppelsieb-Gap-Former zur Papierherstellung |
US5783045A (en) * | 1996-05-06 | 1998-07-21 | Beloit Technologies, Inc. | Pulp and linerboard former with improved dewatering |
DE10106731A1 (de) * | 2001-02-14 | 2002-08-22 | Voith Paper Patent Gmbh | Doppelsiebformer zur Herstellung einer Faserstoffbahn aus einer Faserstoffsuspension |
FI109814B (fi) * | 2001-11-23 | 2002-10-15 | Vaahto Oy | Laitteisto paperi- tai kartonkirainan muodostamiseksi |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT359368B (de) * | 1978-01-16 | 1980-11-10 | Escher Wyss Gmbh | Doppelsiebpapiermaschine |
AT379622B (de) * | 1980-11-26 | 1986-02-10 | Escher Wyss Gmbh | Papiermaschine mit zwei beweglichen wasserdurchlaessigen entwaesserungsbaendern, z.b. sieben |
DE3153305C2 (de) * | 1981-09-04 | 1986-10-23 | Sulzer-Escher Wyss GmbH, 7980 Ravensburg | Entwässerungseinheit für Langsieb-Papiermaschinen |
FI840246A (fi) * | 1984-01-20 | 1985-07-21 | Valmet Oy | Foerfarande och anordning vid formning av pappersbana. |
FI862808A (fi) * | 1986-07-02 | 1988-01-03 | Ahlstroem Oy | Foerfarande och anordning foer avvattning av en fiberbana. |
GB8710428D0 (en) * | 1987-05-01 | 1987-06-03 | Beloit Corp | Multi-ply web forming apparatus |
FI84734C (fi) * | 1988-05-23 | 1992-01-10 | Valmet Paper Machinery Inc | Dubbelviraformare foer pappersmaskin. |
DE3842155A1 (de) * | 1988-12-15 | 1990-06-21 | Voith Gmbh J M | Doppelsiebformer zur herstellung einer papierbahn |
GB8903517D0 (en) * | 1989-02-16 | 1989-04-05 | Beloit Corp | A forming apparatus for forming a web from stock |
DE3910892A1 (de) * | 1989-04-04 | 1990-10-11 | Escher Wyss Gmbh | Doppelsiebformer |
-
1990
- 1990-11-20 DE DE4037017A patent/DE4037017C2/de not_active Expired - Lifetime
-
1991
- 1991-10-16 ES ES91117629T patent/ES2087204T3/es not_active Expired - Lifetime
- 1991-10-16 DE DE59107858T patent/DE59107858D1/de not_active Expired - Fee Related
- 1991-10-16 AT AT91117629T patent/ATE138703T1/de not_active IP Right Cessation
- 1991-10-16 EP EP91117629A patent/EP0486814B1/de not_active Expired - Lifetime
- 1991-11-06 FI FI915234A patent/FI112386B/fi not_active IP Right Cessation
- 1991-11-19 CA CA002055837A patent/CA2055837A1/en not_active Abandoned
- 1991-11-19 JP JP3303038A patent/JPH04263692A/ja active Pending
- 1991-11-19 US US07/795,181 patent/US5282933A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
DE59107858D1 (de) | 1996-07-04 |
DE4037017A1 (de) | 1992-05-21 |
FI915234A (fi) | 1992-05-21 |
ATE138703T1 (de) | 1996-06-15 |
ES2087204T3 (es) | 1996-07-16 |
US5282933A (en) | 1994-02-01 |
CA2055837A1 (en) | 1992-05-21 |
FI112386B (fi) | 2003-11-28 |
JPH04263692A (ja) | 1992-09-18 |
DE4037017C2 (de) | 1994-12-08 |
EP0486814A1 (de) | 1992-05-27 |
FI915234A0 (fi) | 1991-11-06 |
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