EP0665914A1 - Doppelsieb-blattbildner - Google Patents
Doppelsieb-blattbildnerInfo
- Publication number
- EP0665914A1 EP0665914A1 EP94926209A EP94926209A EP0665914A1 EP 0665914 A1 EP0665914 A1 EP 0665914A1 EP 94926209 A EP94926209 A EP 94926209A EP 94926209 A EP94926209 A EP 94926209A EP 0665914 A1 EP0665914 A1 EP 0665914A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- wire
- roller
- twin
- section
- forming
- 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
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 a twin-wire sheet former of a paper machine for producing a paper web between two sandwich-like screens.
- Sheet formers according to the preamble of claim 1 are known. Reference is made to G 92 01 722.3.
- twin-wire sheet formers can be used to convert existing four-wire screens, among others. are badly suited because of their overall height and too much construction work.
- the object of the invention is to provide twin-wire sheet formers which eliminate the disadvantage of the prior art.
- a twin-wire forming part of a paper machine begins with a forming roll in the lower wire and a solid jacket roll in the upper wire.
- the forming roller can be vacuumed or non-vacuumed. Both rollers form a gap together.
- the top and bottom sieves wrap around the forming roller in an arc between 30 and 65 °.
- a machine-wide suspension jet injects into the gap formed by the breast roll and the forming roll and is partially dewatered through both screens due to screen printing and vacuum. Two evenly formed outer layers are formed. The water escaping through the outer sieve is discharged into a trough through a jet guide channel with the help of vacuum.
- both screens are continued approximately horizontally.
- the further sheet formation takes place in a turbulence section, which is formed by a vacuum box with individual strips and a formation box in the bottom wire.
- the formation box is equipped with individual, pneumatically adjustable formation bars.
- the sieves are separated in a known manner using a curved separating suction device.
- the bottom wire after the separating vacuum resembles a fourdrinier wire with flat suction, wire suction roller and wire drive roller.
- a basic common feature of all proposed sheet formers is an essentially horizontal arrangement of the sheet formation zone, as a result of which, in the form shown, it is particularly suitable for replacing existing fourdriners or converting an existing fourdriver into a twin-wire former.
- FIGS. 1-5 Exemplary embodiments are shown in FIGS. 1-5.
- Figure 1 shows a converted to the twin-wire sheet forming wire with the lower peripheral screen 2 and the overlying screen 1 arranged above.
- the screen 1 is deflected over several deflecting rollers and guided to a first breast roller 3, which is approximately at an angle of 45 ° is on the left above the first incoming roller 4 of the lower screen 2, which is designed as a forming roller.
- a first dewatering shoe 6 is arranged on the side of the sieve 2, which has a slight curvature corresponding to the roller 4.
- a double drainage unit 7.1 and 7.2 is arranged, for example according to US Pat. No. 5,045,153 (P 4713), the drainage unit 7.2 being a suction box with a multiplicity of rigid strips 7.4 which are on the side of sieve 1.
- the drainage unit 7.1 is arranged, which with a variety of
- Drainage strips 7.3 is equipped, which are arranged offset to the opposite strips 7.4 of the unit 7.2. It is essential that at least some of the strips 7.3 of the unit 7.1 are made by means of flexible elements, e.g. Springs or pneumatic pressure cushions (as indicated schematically) are supported and that preferably each individual bar can be pressed onto the screen 2 by means of a selectable force. Attention is drawn to US-PS 5078835 (P 4734). The radius of curvature in the center of the sieve units 7.2 and 7.1 lies on the other side of the sieves with respect to the radius of curvature of the sieve unit 6.
- a separation unit in the form of an aspirated shoe which is in turn curved is attached to the side of the sieve 2.
- the screen 1 separating from the web in the area of the shoe 8, is returned via a deflection roller 11 via further deflection rollers to the first roller 3 of this screen loop.
- two flat suction devices 9 are attached by way of example, which effect further dewatering of the fiber web and guide the screen to a further suction roller 10, from where the screen 2 in turn has several
- Deflection rollers is guided back to the first forming roller 4, while the fiber web is removed directly on or after the roller 10.
- FIG. 2 shows a twin-wire sheet former similar to FIG. 1, the initial phase from the headbox to the dewatering unit 7.1 and 7.2 being basically the same, except for the fact that the dewatering unit 7.2 and 7.1 has no curvature.
- the dewatering unit 7.2 is then followed by one on the same screen side
- FIG. 3 shows a twin-wire sheet former with a first screen 1 at the top and a second screen 2 at the bottom. Both screens form a screen gap, the screen 1 being deflected in the horizontal direction by a guide roller 3, while the screen 2 is deflected by a forming roller , which is designed as a suction roll, deflects the screen 2 into the horizontal.
- a forming roller which is designed as a suction roll
- the element 7.1 is followed by a further, oppositely curved dewatering shoe 13, which transfers the twin wire to a deflecting roller 14 on the same side, from where the twin wire is guided to an opposite suction roller 12, in its connection in turn on the side of the wire 2 a separating element 8 is provided, which separates the wire 1 from the fiber web lying on the web 2 and continuously leads back to the roller 3 via a deflection roller 11 via further deflection rollers, while the wire 2 is guided together with the fiber web over a suction guide roller 10 , is then separated from the screen 2, while the screen 2 is in turn guided back to the roller 4 via a plurality of deflection rollers.
- FIG. 4 shows a twin-wire sheet former, which corresponds to FIG. 3 in the initial phase, but the screen separation takes place with the aid of the separating device 8 directly after the two-sided dewatering via the dewatering device 7.2 and 7.1.
- the screen 1 is again separated after the separation over the roller 11 and others
- Deflection rollers are guided back to the inlet roller 3, while the wire 2 with the fiber web lying thereon is carried on horizontally and is dewatered via a plurality of suction boxes 15 and 9, which are attached to the side of the wire 2, and is then deflected again via the suction roller 10. After the suction roll 10, the fiber web is removed, while the wire 2 is guided back over several deflection rolls to the forming roll 4.
- FIG. 5 shows a twin-wire sheet former with a first revolving sieve 1 at the top and a second revolving sieve 2 at the bottom.
- the sieve 2 is transferred into the horizontal via a breast roller 4 coming from below, while the sieve 1 coming from above via a top horizontal forming roll designed as a suction roll.
- the forming roller 3 forms with the screen 2 coming from the deflecting roller 4 a screen gap in which the stock suspension is introduced through the headbox 5.
- a curved forming shoe 6 Opposite the suction and forming roller and subsequently there is a curved forming shoe 6, the curvature of which is formed opposite to the forming roller 3.
- the following drainage elements 7.2, 7.1, etc. correspond to the embodiment in FIG. 1.
Landscapes
- Paper (AREA)
- Portable Nailing Machines And Staplers (AREA)
- Package Frames And Binding Bands (AREA)
- Making Paper Articles (AREA)
- Overhead Projectors And Projection Screens (AREA)
- Laminated Bodies (AREA)
- Sheet Holders (AREA)
Description
Claims
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4328024 | 1993-08-20 | ||
DE4328024A DE4328024A1 (de) | 1993-08-20 | 1993-08-20 | Doppelsieb-Blattbildner |
PCT/EP1994/002752 WO1995006162A1 (de) | 1993-08-20 | 1994-08-18 | Doppelsieb-blattbildner |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0665914A1 true EP0665914A1 (de) | 1995-08-09 |
EP0665914B1 EP0665914B1 (de) | 1998-07-29 |
Family
ID=6495627
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94926209A Expired - Lifetime EP0665914B1 (de) | 1993-08-20 | 1994-08-18 | Doppelsieb-blattbildner |
Country Status (8)
Country | Link |
---|---|
US (1) | US5914009A (de) |
EP (1) | EP0665914B1 (de) |
JP (1) | JPH08502793A (de) |
AT (1) | ATE169072T1 (de) |
CA (1) | CA2147381A1 (de) |
DE (2) | DE4328024A1 (de) |
FI (1) | FI951862A (de) |
WO (1) | WO1995006162A1 (de) |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI953984A (fi) * | 1995-08-24 | 1997-02-25 | Valmet Corp | Paperikoneen rainanmuodostusosa |
DE19733318A1 (de) * | 1997-08-01 | 1999-02-04 | Voith Sulzer Papiermasch Gmbh | Doppelsiebformer |
AT405538B (de) | 1997-11-28 | 1999-09-27 | Andritz Patentverwaltung | Vorrichtung zum entwässern einer faserstoffbahn |
DE19828237A1 (de) * | 1998-06-25 | 1999-12-30 | Voith Sulzer Papiertech Patent | Doppelsiebformer |
JP2004510898A (ja) * | 2000-10-16 | 2004-04-08 | ヴァン エッセン、ロイ | 活性を調節できる脱水ボックス |
DE10106731A1 (de) * | 2001-02-14 | 2002-08-22 | Voith Paper Patent Gmbh | Doppelsiebformer zur Herstellung einer Faserstoffbahn aus einer Faserstoffsuspension |
WO2004018768A1 (en) * | 2002-08-23 | 2004-03-04 | Metso Paper, Inc. | Forming of a paper or board web in a twin-wire former or in a twin-wire section of a former |
AT412098B (de) * | 2002-11-11 | 2004-09-27 | Andritz Ag Maschf | Vorrichtung zur trennung einer papierbahn von einem sieb |
DE10255471A1 (de) * | 2002-11-28 | 2004-07-22 | Voith Paper Patent Gmbh | Doppelsiebformer einer Maschine zur Herstellung einer Faserstoffbahn und dazugehöriges Verfahren |
DE10343914A1 (de) * | 2003-09-19 | 2005-05-04 | Voith Paper Patent Gmbh | Entwässerungseinrichtung eines Doppelsiebformers einer Maschine zur Herstellung einer Faserstoffbahn und dazugehöriges Verfahren |
FI116628B (fi) * | 2004-02-13 | 2006-01-13 | Metso Paper Inc | Monikerrosrainan muodostusosa |
FI116688B (fi) * | 2004-02-13 | 2006-01-31 | Metso Paper Inc | Monikerrosrainan muodostusosa |
DE102005003531A1 (de) * | 2005-01-25 | 2006-08-03 | Voith Paper Patent Gmbh | Doppelsiebformer und Verfahren zur Herstellung einer Faserstoffbahn aus mindestens einer Faserstoffsuspension |
DE102011078238A1 (de) | 2011-06-28 | 2013-01-03 | Voith Patent Gmbh | Entwässerungsvorrichtung für eine Maschine zur Herstellung einer Faserstoffbahn aus wenigstens einer Faserstoffsuspension |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI813027L (fi) * | 1981-09-29 | 1983-03-30 | Ahlstroem Oy | Banformningsfoerfarande och -anordning |
US5389206A (en) * | 1989-08-22 | 1995-02-14 | J. M. Voith Gmbh | Twin wire former |
FI83977C (fi) * | 1989-11-06 | 1991-09-25 | Valmet Paper Machinery Inc | Gapformare i pappersmaskin. |
DE4026953C2 (de) * | 1990-01-26 | 1995-11-30 | Escher Wyss Gmbh | Entwässerungsvorrichtung und Verfahren zur Entwässerung an einem Doppelsiebformer |
DE4005420C2 (de) * | 1990-02-21 | 1995-06-08 | Voith Gmbh J M | Doppelsiebformer |
DE4019884A1 (de) * | 1990-06-22 | 1992-01-09 | Voith Gmbh J M | Leiste zur nachgiebigen stuetzung eines siebbandes |
FI91788C (fi) * | 1990-09-12 | 1994-08-10 | Valmet Paper Machinery Inc | Paperikoneen kaksiviirainen rainanmuodostusosa |
DE4037017C2 (de) * | 1990-11-20 | 1994-12-08 | Escher Wyss Gmbh | Naßteil einer Doppelsieb-Papiermaschine |
FI93032C (fi) * | 1991-03-15 | 1995-02-10 | Valmet Paper Machinery Inc | Paperikoneen kaksiviirainen rainanmuodostusosa |
DE9105797U1 (de) * | 1991-05-10 | 1991-07-04 | J.M. Voith Gmbh, 7920 Heidenheim | Doppelsiebpartie einer Papier- oder Kartonmaschine |
DE4212609A1 (de) * | 1991-12-17 | 1993-10-28 | Voith Gmbh J M | Doppelsiebformer |
DE4141607C2 (de) * | 1991-12-17 | 1996-04-25 | Voith Gmbh J M | Doppelsiebformer |
DE9201722U1 (de) * | 1992-02-12 | 1992-04-23 | J.M. Voith Gmbh, 7920 Heidenheim | Doppelsiebpartie für eine Papiermaschine |
DE4402273C2 (de) * | 1994-01-27 | 1995-11-23 | Voith Gmbh J M | Papiermaschine zur Herstellung mehrlagiger Papierbahnen |
-
1993
- 1993-08-20 DE DE4328024A patent/DE4328024A1/de not_active Ceased
-
1994
- 1994-08-18 EP EP94926209A patent/EP0665914B1/de not_active Expired - Lifetime
- 1994-08-18 US US08/713,585 patent/US5914009A/en not_active Expired - Fee Related
- 1994-08-18 AT AT94926209T patent/ATE169072T1/de active
- 1994-08-18 CA CA002147381A patent/CA2147381A1/en not_active Abandoned
- 1994-08-18 WO PCT/EP1994/002752 patent/WO1995006162A1/de active IP Right Grant
- 1994-08-18 JP JP7507336A patent/JPH08502793A/ja active Pending
- 1994-08-18 DE DE59406561T patent/DE59406561D1/de not_active Expired - Fee Related
-
1995
- 1995-04-19 FI FI951862A patent/FI951862A/fi not_active Application Discontinuation
Non-Patent Citations (1)
Title |
---|
See references of WO9506162A1 * |
Also Published As
Publication number | Publication date |
---|---|
US5914009A (en) | 1999-06-22 |
FI951862A0 (fi) | 1995-04-19 |
DE4328024A1 (de) | 1995-02-23 |
EP0665914B1 (de) | 1998-07-29 |
JPH08502793A (ja) | 1996-03-26 |
DE59406561D1 (de) | 1998-09-03 |
FI951862A (fi) | 1995-04-19 |
WO1995006162A1 (de) | 1995-03-02 |
ATE169072T1 (de) | 1998-08-15 |
CA2147381A1 (en) | 1995-03-02 |
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