EP0497932A1 - Schlitzdüse, insbesondere für einen doppelsiebformer. - Google Patents
Schlitzdüse, insbesondere für einen doppelsiebformer.Info
- Publication number
- EP0497932A1 EP0497932A1 EP91913352A EP91913352A EP0497932A1 EP 0497932 A1 EP0497932 A1 EP 0497932A1 EP 91913352 A EP91913352 A EP 91913352A EP 91913352 A EP91913352 A EP 91913352A EP 0497932 A1 EP0497932 A1 EP 0497932A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- sieve
- slot
- slot nozzle
- section
- former
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 14
- 239000000725 suspension Substances 0.000 claims description 9
- 210000000481 breast Anatomy 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 238000011144 upstream manufacturing Methods 0.000 claims description 2
- 239000013013 elastic material Substances 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 description 4
- 239000000123 paper Substances 0.000 description 3
- 230000005484 gravity Effects 0.000 description 2
- 239000011111 cardboard Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 238000009420 retrofitting Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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
- D21F1/48—Suction apparatus
-
- 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 slot nozzle according to the preamble of claim 1 and its arrangement in a twin wire former of a paper or board machine.
- a slot nozzle of the above-mentioned type is used in particular in twin-wire formers to remove the white water emerging through the top wire from the suspension layer to be dewatered and formed between the screens. While the white water is relatively easy to drain down from the lower sieve, using gravity, the white water must be drained from the upper sieve against gravity, essentially vertically upwards. With the kinetic energy of the water moving at the speed of the sieves, the water rises along a wall in the way of the slot nozzle and can be skimmed off and removed from the upper sieve, possibly using a vacuum.
- twin wire former according to EP 0 289 445, a long shoe is first arranged on the lower wire.
- the upstream white water cannot be removed directly from the top sieve by the downstream slot nozzle.
- the formation of the upper side of the suspension is not improved by pressure pulses.
- DE-PS 11 16 967 shows water-draining guide elements and pacifiers, which remove the white water upwards, but are not suitable for controlling the formation.
- a primary and a secondary autoslice are present which are set rigidly with respect to the top sieve, with the suspension layer to be formed
- the object of the invention is to provide a slotted nozzle that functions cleanly and reliably at the top, or a dewatering unit having such slotted nozzles, with which it is possible to apply several pressure pulses that support a good formation and act on the surface of the suspension to exercise, the adjustment of the slot nozzle to the top wire, ie can be automatically adjusted simultaneously to its position at different thicknesses of the suspension layer between the sieves.
- the slot nozzle it should be possible with the slot nozzle to convert a four-wire section of a paper machine into a double-wire section relatively easily.
- the slot nozzle should also be used to advantage in the production of so-called heavy types of paper or cardboard (e.g. liner board, corrugated material, etc.).
- REPLACEMENT LATT Fig. 1 shows an embodiment of the slot nozzle on a larger scale
- Fig. 2 shows an example of a twin wire former with slot nozzles according to the invention
- Fig. 3 shows another example with a varied arrangement of the headbox.
- the slot nozzle 1 which is used in particular in a twin wire former 2 of a paper or board machine, is primarily intended for removing the white water from the upper wire 3 of the twin wire former. It has a water-carrying space 4, which is formed between two walls 5 and 6 running across the entire width of the sieve 3.
- the front wall 5 in the running direction of the screen is shorter in the direction of the screen 3 than the rear wall 6, which in its operating position extends to the screen 3, with a between the lower edge of the shorter front wall 5 and the screen 3 Gap 7 exists.
- the rear wall 8 has two horizontally extending parts 6 and 9.
- the upper part 8 is fixed in the operating position and the lower part 9, which faces the sieve 3, is designed and arranged as a diaphragm which can be displaced along the upper part and partially overlaps it.
- This part 9 is slidably adjustable both in the direction towards the wire 3 as well as ⁇ ⁇ direction of the screen 3 away. In the respectively set position, the part 9 is elastically supported in the direction against the sieve 3 on the upper, fixed part 8.
- a servomotor 10 arranged between the upper part 8 and the lower part 9 is provided for displacing and elastically supporting the lower part 9.
- the steep motor according to the exemplary embodiment shown here has two pressure chambers, an upper pressure chamber 22, which is provided for the movement of the lower part 9 upwards, and a lower pressure chamber 23, which for the movement of the lower part 9 downwards in the direction of the screen 3 is provided.
- the rooms 22 and 23 are lined with dense but elastic hoses that can be pressurized with a medium.
- the pressure is supported elastically so that the lower edge 25 of the lower part 9 facing the screen 3, which is provided with a wear-resistant material layer 24, can follow a changing position of the screen 3. This position changes during operation when the thickness of the suspension layer changes. The adjustment is done automatically.
- the white water rises through the water-carrying space 4 and flows into a collecting space 26, from which it flows out through an opening 27.
- the collecting room can be created in front of or behind room 4.
- a compact dewatering unit can be put together from the individual slot nozzles, which can also be adjusted as a whole unit relative to the screen.
- FIG. 2 shows an example of a twin wire former 2 with slot nozzles 1 according to the invention. It has a support plane which is defined by the arrangement and shape of support elements 11 to 13 or 14 to 17. These support elements are of a known type and are used both for discharging the white water downwards and for introducing pressure pulses onto the lower side of the suspension layer to be formed between the upper sieve 3_ and the lower sieve 18, which circulate along the support plane.
- a number of slot nozzles 1, during operation touching top sieve 3 is arranged, each with a slot nozzle on the section delimited by adjacent support elements 11 and 12, or 12 and 13 is, in each case in the wire running direction behind the support element 11, or 12, or 13.
- the section equipped with the support nozzles 1 is followed by a section equipped with a press shoe 19 of known type, in which 18 additional support elements 14 to 15 in the area on the bottom wire of the press shoe 19 are arranged.
- the suspension is injected between the screens at the location between the breast rolls 20 and 21 through a headbox nozzle 28.
- the upper breast roll 20 is a full roll
- the lower breast roll 21 is an open roll which receives and removes white water.
- FIG. 3 Another possible arrangement of the jet region is shown in FIG. 3 with a headbox 28 ' essentially forming a jet upwards on a breast roller 21', in the centrifugal region of which the first suction nozzle is effective.
- twin-wire former which, in contrast to the previously described one in the running direction of the wires, first arranged a press shoe (like 19) on the top wire, which section is followed by a section equipped with a few slot nozzles (like 1).
- a support structure 29 is advantageous, to which the individual elements can be attached or moved.
Landscapes
- Paper (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- Nozzles (AREA)
- Sheet Holders (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Description
Claims
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4028126A DE4028126C2 (de) | 1990-09-05 | 1990-09-05 | Schlitzdüse, insbesondere für einen Doppelsiebformer und deren Verwendung in einem Doppelsiebformer |
| DE4028126 | 1990-09-05 | ||
| PCT/DE1991/000611 WO1992004500A1 (de) | 1990-09-05 | 1991-07-30 | Schlitzdüse, insbesondere für einen doppelsiebformer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0497932A1 true EP0497932A1 (de) | 1992-08-12 |
| EP0497932B1 EP0497932B1 (de) | 1996-02-14 |
Family
ID=6413634
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP91913352A Expired - Lifetime EP0497932B1 (de) | 1990-09-05 | 1991-07-30 | Schlitzdüse, insbesondere für einen doppelsiebformer |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP0497932B1 (de) |
| AT (1) | ATE134233T1 (de) |
| CA (1) | CA2050647A1 (de) |
| DE (2) | DE4028126C2 (de) |
| FI (1) | FI97306C (de) |
| WO (1) | WO1992004500A1 (de) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE29619709U1 (de) * | 1996-11-13 | 1997-01-09 | Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim | Siebpartie einer Papiermaschine |
| DE19651241A1 (de) * | 1996-12-10 | 1998-06-18 | Voith Sulzer Papiermasch Gmbh | Doppelsieb-Blattbildungseinrichtung |
| FI991356L (fi) * | 1999-06-14 | 2000-12-15 | Valmet Corp | Menetelmä veden poistamiseksi sellunkuivatuskoneen viiraosalla ja vede npoistoyksikkö |
| GB0030682D0 (en) * | 2000-12-15 | 2001-01-31 | Astenjohnson Inc | Suction assisted skimmer blade |
| GB2370046A (en) | 2000-12-15 | 2002-06-19 | Astenjohnson Inc | Adjustable resilient blade support |
| AT503404A1 (de) * | 2006-04-13 | 2007-10-15 | Bartelmuss Klaus Ing | Verfahren zur steuerung der temperatur der keramischen elemente einer abstütz- bzw. abstreifleiste in einer anlage zur papiererzeugung sowie einrichtung und abstütz- bzw. abstreifleiste zur durchführung dieses verfahrens |
| DE102007035488A1 (de) * | 2007-07-28 | 2009-01-29 | Voith Patent Gmbh | Verfahren zur Herstellung einer Faserstoffbahn und Doppelsiebformer zur Durchführung des Verfahrens |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2143871B (en) * | 1983-07-23 | 1986-11-12 | Beloit Walmsley Ltd | Twin wire paper forming machine |
| WO1986000012A1 (en) * | 1984-06-07 | 1986-01-03 | Design & Industry Pty. Limited | Eyeshield |
| GB2174120B (en) * | 1985-04-26 | 1988-08-10 | Doerries Gmbh | Apparatus for guiding the wires of a twin wire forming section of a paper or cardboard machine |
| GB8710428D0 (en) * | 1987-05-01 | 1987-06-03 | Beloit Corp | Multi-ply web forming apparatus |
| FI77281C (fi) * | 1987-06-18 | 1989-02-10 | Valmet Paper Machinery Inc | Hybridformare foer en pappersmaskin. |
| FI85885C (fi) * | 1987-11-25 | 1992-06-10 | Tampella Oy Ab | Foerfarande foer formering av en fiberbana i en pappersmaskin samt en anordning foer utfoering av foerfarandet. |
| FI84637C (fi) * | 1988-12-01 | 1991-12-27 | Valmet Paper Machinery Inc | Foerfarande och anordning vid formning av pappers- eller kartongbana. |
| DE3842155A1 (de) * | 1988-12-15 | 1990-06-21 | Voith Gmbh J M | Doppelsiebformer zur herstellung einer papierbahn |
-
1990
- 1990-09-05 DE DE4028126A patent/DE4028126C2/de not_active Revoked
-
1991
- 1991-07-30 AT AT91913352T patent/ATE134233T1/de not_active IP Right Cessation
- 1991-07-30 EP EP91913352A patent/EP0497932B1/de not_active Expired - Lifetime
- 1991-07-30 DE DE59107409T patent/DE59107409D1/de not_active Expired - Fee Related
- 1991-07-30 WO PCT/DE1991/000611 patent/WO1992004500A1/de not_active Ceased
- 1991-09-04 CA CA002050647A patent/CA2050647A1/en not_active Abandoned
-
1992
- 1992-04-23 FI FI921813A patent/FI97306C/fi not_active IP Right Cessation
Non-Patent Citations (1)
| Title |
|---|
| See references of WO9204500A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FI97306B (fi) | 1996-08-15 |
| DE59107409D1 (de) | 1996-03-28 |
| EP0497932B1 (de) | 1996-02-14 |
| FI921813L (fi) | 1992-04-23 |
| DE4028126C2 (de) | 1993-10-14 |
| WO1992004500A1 (de) | 1992-03-19 |
| FI921813A0 (fi) | 1992-04-23 |
| DE4028126A1 (de) | 1992-03-19 |
| ATE134233T1 (de) | 1996-02-15 |
| CA2050647A1 (en) | 1992-03-13 |
| FI97306C (fi) | 1996-11-25 |
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