WO1992004500A1 - Slot nozzle, especially for a twin-wire former - Google Patents
Slot nozzle, especially for a twin-wire former Download PDFInfo
- Publication number
- WO1992004500A1 WO1992004500A1 PCT/DE1991/000611 DE9100611W WO9204500A1 WO 1992004500 A1 WO1992004500 A1 WO 1992004500A1 DE 9100611 W DE9100611 W DE 9100611W WO 9204500 A1 WO9204500 A1 WO 9204500A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sieve
- slot nozzle
- slot
- section
- wire
- Prior art date
Links
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)
- Sheet Holders (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Infusion, Injection, And Reservoir Apparatuses (AREA)
- Nozzles (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP91913352A EP0497932B1 (en) | 1990-09-05 | 1991-07-30 | Slot nozzle, especially for a twin-wire former |
DE59107409T DE59107409D1 (en) | 1990-09-05 | 1991-07-30 | SLOT NOZZLE, IN PARTICULAR FOR A DOUBLE SCREEN FORMER |
FI921813A FI97306C (en) | 1990-09-05 | 1992-04-23 | Double-wire shapes of a paper or cardboard machine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4028126A DE4028126C2 (en) | 1990-09-05 | 1990-09-05 | Slot nozzle, in particular for a twin wire former and their use in a twin wire former |
DEP4028126.4 | 1990-09-12 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1992004500A1 true WO1992004500A1 (en) | 1992-03-19 |
Family
ID=6413634
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1991/000611 WO1992004500A1 (en) | 1990-09-05 | 1991-07-30 | Slot nozzle, especially for a twin-wire former |
Country Status (6)
Country | Link |
---|---|
EP (1) | EP0497932B1 (en) |
AT (1) | ATE134233T1 (en) |
CA (1) | CA2050647A1 (en) |
DE (2) | DE4028126C2 (en) |
FI (1) | FI97306C (en) |
WO (1) | WO1992004500A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000077298A1 (en) * | 1999-06-14 | 2000-12-21 | Metso Paper, Inc. | Method for removing water on the wire section of a pulp dryer and a dewatering unit |
US6982025B2 (en) | 2000-12-15 | 2006-01-03 | Astenjohnson, Inc. | Adjustable resilient blade support |
US6984291B2 (en) | 2000-12-15 | 2006-01-10 | Astenjohnson, Inc. | Vacuum box with skimmer blade |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE29619709U1 (en) * | 1996-11-13 | 1997-01-09 | Voith Sulzer Papiermaschinen GmbH, 89522 Heidenheim | Screen section of a paper machine |
DE19651241A1 (en) * | 1996-12-10 | 1998-06-18 | Voith Sulzer Papiermasch Gmbh | Double fourdrinier pulp water extraction |
AT503404A1 (en) * | 2006-04-13 | 2007-10-15 | Bartelmuss Klaus Ing | METHOD FOR CONTROLLING THE TEMPERATURE OF THE CERAMIC ELEMENTS OF A SUPPORTING DEVICE DIVIDING STRIP IN A PAPER PRODUCTION PLANT AND DEVICE AND SUPPORTING DEVICE. SPREADING STRIP FOR CARRYING OUT THIS PROCEDURE |
DE102007035488A1 (en) * | 2007-07-28 | 2009-01-29 | Voith Patent Gmbh | Process for producing a fibrous web and twin-wire former for carrying out the process |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2174120A (en) * | 1985-04-26 | 1986-10-29 | Doerries Gmbh | Twin wire guiding apparatus |
EP0318107A1 (en) * | 1987-11-25 | 1989-05-31 | Oy Tampella Ab | Method of formation of a fibrous web in a papermachine and apparatus for accomplishing the method |
EP0373133A2 (en) * | 1988-12-01 | 1990-06-13 | Valmet Paper Machinery Inc. | Method and device in the formation of a paper or board web |
DE3842155A1 (en) * | 1988-12-15 | 1990-06-21 | Voith Gmbh J M | DOUBLE SCREEN FORM FOR PRODUCING A PAPER SHEET |
EP0296135B1 (en) * | 1987-06-18 | 1990-10-03 | Valmet Paper Machinery Inc. | Hydrid former for a paper machine |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2143871B (en) * | 1983-07-23 | 1986-11-12 | Beloit Walmsley Ltd | Twin wire paper forming machine |
EP0183806A4 (en) * | 1984-06-07 | 1987-11-30 | Design & Industry Pty Ltd | Eyeshield. |
GB8710428D0 (en) * | 1987-05-01 | 1987-06-03 | Beloit Corp | Multi-ply web forming apparatus |
-
1990
- 1990-09-05 DE DE4028126A patent/DE4028126C2/en not_active Revoked
-
1991
- 1991-07-30 DE DE59107409T patent/DE59107409D1/en not_active Expired - Fee Related
- 1991-07-30 WO PCT/DE1991/000611 patent/WO1992004500A1/en active IP Right Grant
- 1991-07-30 AT AT91913352T patent/ATE134233T1/en not_active IP Right Cessation
- 1991-07-30 EP EP91913352A patent/EP0497932B1/en not_active Expired - Lifetime
- 1991-09-04 CA CA002050647A patent/CA2050647A1/en not_active Abandoned
-
1992
- 1992-04-23 FI FI921813A patent/FI97306C/en not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2174120A (en) * | 1985-04-26 | 1986-10-29 | Doerries Gmbh | Twin wire guiding apparatus |
EP0296135B1 (en) * | 1987-06-18 | 1990-10-03 | Valmet Paper Machinery Inc. | Hydrid former for a paper machine |
EP0318107A1 (en) * | 1987-11-25 | 1989-05-31 | Oy Tampella Ab | Method of formation of a fibrous web in a papermachine and apparatus for accomplishing the method |
EP0373133A2 (en) * | 1988-12-01 | 1990-06-13 | Valmet Paper Machinery Inc. | Method and device in the formation of a paper or board web |
DE3842155A1 (en) * | 1988-12-15 | 1990-06-21 | Voith Gmbh J M | DOUBLE SCREEN FORM FOR PRODUCING A PAPER SHEET |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000077298A1 (en) * | 1999-06-14 | 2000-12-21 | Metso Paper, Inc. | Method for removing water on the wire section of a pulp dryer and a dewatering unit |
US6982025B2 (en) | 2000-12-15 | 2006-01-03 | Astenjohnson, Inc. | Adjustable resilient blade support |
US6984291B2 (en) | 2000-12-15 | 2006-01-10 | Astenjohnson, Inc. | Vacuum box with skimmer blade |
Also Published As
Publication number | Publication date |
---|---|
FI97306B (en) | 1996-08-15 |
DE4028126C2 (en) | 1993-10-14 |
FI97306C (en) | 1996-11-25 |
FI921813A (en) | 1992-04-23 |
EP0497932B1 (en) | 1996-02-14 |
CA2050647A1 (en) | 1992-03-13 |
FI921813A0 (en) | 1992-04-23 |
DE59107409D1 (en) | 1996-03-28 |
EP0497932A1 (en) | 1992-08-12 |
DE4028126A1 (en) | 1992-03-19 |
ATE134233T1 (en) | 1996-02-15 |
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