EP0069667B1 - Presse aspirante à plusieurs interstices de pressage - Google Patents
Presse aspirante à plusieurs interstices de pressage Download PDFInfo
- Publication number
- EP0069667B1 EP0069667B1 EP82401255A EP82401255A EP0069667B1 EP 0069667 B1 EP0069667 B1 EP 0069667B1 EP 82401255 A EP82401255 A EP 82401255A EP 82401255 A EP82401255 A EP 82401255A EP 0069667 B1 EP0069667 B1 EP 0069667B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- press
- web
- rollers
- roller
- press roller
- 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
Links
- 238000001035 drying Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 2
- 238000003825 pressing Methods 0.000 description 11
- 239000010438 granite Substances 0.000 description 4
- 238000009950 felting Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000000835 fiber Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009432 framing Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000013055 pulp slurry Substances 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
- D21F3/0209—Wet presses with extended press nip
- D21F3/0254—Cluster presses, i.e. presses comprising a press chamber defined by at least three rollers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B30—PRESSES
- B30B—PRESSES IN GENERAL
- B30B9/00—Presses specially adapted for particular purposes
- B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
- B30B9/24—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using an endless pressing band
- B30B9/246—The material being conveyed around a drum between pressing bands
Definitions
- the present invention relates to papermaking and especially to pressing a sheet, such as paper, by using at least four press rollers on substantially stationary horizontal axes and in rotating contact with one another as a closed train defining a chamber between the rolls and end seals, for exerting air pressure at a previous roller surface thereby to induce through drying of a sheet.
- a pulp slurry firstly is formed into a sheet by drainage at a circulating endless mesh, secondly the sheet is pressed between rollers for more drainage and thirdly the sheet is heated for final dryness.
- moisture removal by pressing costs less than removal by heating, because pressing utilizes less apparatus and energy than heating does.
- the present invention is directed toward improving moisture removal by pressing, for reducing the costly heat requirement, and toward multiple pressing for improving bond of fibers together to yield improved paper strength.
- Multi-nip pressing is known, including pressure-chamber means for extending pressure beyond a nip, liquid-pressure means urging impervious-belt means against a sheet and press roll for a small arc at a nip.
- Pressure-pad means also are known for pressing a sheet and felt against a small arc at a nip.
- Document US-A-4.124.942 refers to a conditioner type of system disposed after a dryer for the purpose of increasing, decreasing or equalizing the moisture content in a web.
- a cental zone is created between rolls 2,2' and 4, but there is no pressure differential between said zone and the interior of the upper roll 4, where the web passes. As a result, gas cannot flow across that part of web: drying could not be carried out.
- a central zone is created between porous rolls 32 and 33, and gas flows from the central zone to rolls 33, through the web W.
- a press felt-which is of importance in removing moisture by pressing-could not be satisfactorily utilized in conjunction with these rolls.
- the invention provides a four nip press for drying a web of material comprising four rollers, each mounted for rotation about respective axes, said four rollers being positioned relative to each other such that each roller is in contact with two other rollers forming nips therebetween to thereby provide a closed train of rollers, means defining with said four rollers an enclosed central zone into which said web is received through a first of said nips and passing circumferentially over at least one of said rollers in the central zone and discharged therefrom through a second of said nips; said at least one roller being a porous cylinder and having a hollow interior; and means for providing a circulation of gaz in said enclosed central zone and in the interior of said at least one press roller, characterized in that said four rollers are press rollers so adapted that water is squeezed out of the web by said nips, in that said second nip is formed between said porous cylinder being at least one press roller and a non-porous second press roller, means resiliently
- a press roller along the closed train helps to determine whether a roller should be pervious or impervious, hard or soft surfaced, bigger or smaller than mating rollers.
- These distinctive qualities of rollers along a closed train are somewhat analogous to the distinctive qualities of elements along a ring of an organic chemical molecule.
- a closed train of press rollers according to the present invention may be joined to another closed train to form a chain press somewhat as organic chemical rings may be joined to form a chain molecule.
- roller surface In choice of roller surface, it is well known for example, that having at least one press roller of a nip as soft surfaced will prolong felt life, while using a granite press roller in direct contact with a damp sheet will let a sheet release after the nip. Choice of suitable roller surface in this new combination for single and double felting would be apparent to those skilled in the art.
- roller 12 may be resiliently biased by biasing means schematically illustrated at 14.
- roller 12 touches the sheet directly and would preferably be of granite for sheet release.
- Rollers 13 and 15 could be soft surfaces while roller 12' could be hard surfaced.
- At least one of the rollers, herein roller 15 is a hollow roller having a pervious outer wall 16 in registry with endless belt 17 which is a pervious carrier of the paper stock of sheet 11 to be dried.
- the four press rollers 12, 12', 13 and 15 are in close contact with one another in a succession as a closed train whereby to define nips at the area of contact therebetween and these are indicated by reference numeral 18.
- the four rollers will define four nips which will apply pressure on the endless felt and paper stock passing therebetween.
- the endless felt 17 advances as indicated by arrow 19 and is a pervious carrier for the paper sheet whereby air may pass therethrough to convect water out of the pulp stock.
- One of the rollers has a drive connected thereto, by means well known in the art, for imparting rotation to all of the four rollers.
- a substantially sealed chamber 20 is defined in the area between the rollers 12,12', 13 and 15 and between chamber end walls 21, (here shown in phantom line).
- suitable conduit means which may be constructed in several ways. As shown in Figure 1, an air box 22 is mounted in an external sealed relationship with another surface of the roll 15, and a conduit 23 is connected to the box 22 for the convection of air with moisture herein.
- the roll 13 may be a pervious roller and may have a conduit 24 connected thereto for the convention of air and moisture. Rotation of roll 13 is accommodated at stationary conduit 24 by well known rotary joint means 32.
- a further conduit 25 is connected to one of the end walls 21 for the ingress of air under pressure.
- the chamber 20 will force air through the pulp stock and felt 17 passing through the pervious outer wall of rolls 13 and 15 thereby forcing moisture out of the pulp stock, through to the endless felt 17 and into the hollow rolls 13 and 15 for convention of air and moisture by conduits 23 and 24.
- the roller 13 is suitably sealed in its opened area by means such as a solid shoe 26.
- shoe 26 being external to roller 13, the rim 13 remains continuously shielded from atmospheric pressure and the shoe is more accessible than an internal seal 31 would be.
- the pulp stock In its operation, as the pulp stock enters the multi-nip press, water is squeezed out at a first nip. The pulp stock is then subjected to a suction by the hollow roller 15 in its travel area within the chamber 20. Thereafter the pulp stock is again squeezed at a second and third nip and enters into the chamber 20 for a second travel while subjected to a suction along a surface area of the second press roller 13.
- the paper stock exits the multi-nip press in a drier condition than possible with known prior art multi-nip press devices.
- a single hollow roller is provided with a pervious surface and resiliently biased against three other rollers.
- roller 28 may be a granite solid roller and rollers 29 and 30 may be rubber rollers.
- Air is exhausted from the chamber 20 via the exhaust conduit 25 and this causes an ingress of air, as shown by arrows 30 through the felt 17 and the paper stock which is located between the felt and a large outer surface portion of the pervious roller 27 causing moisture to be drawn within the roller 27 and exhausted through conduit 25 via the central chamber 20.
- the invention should not be limited to the combinations of the air convection means disclosed herein, as other arrangements of air convection are possible.
- FIG. 3 there is shown the invention as utilized in a double felted press.
- a second endless felt 31 is driven in an endless manner about the rollers 12, 12', 13 and 15 and in registry with the other endless felt 17.
- the pulp stock 11 is trapped between the felts.
- Both endless felts are of a porous construction.
- the operation of the double felted press, for the removal of moisture of the pulp stock, is the same as that disclosed for Figure 1.
- the multi-nip suction press may comprise six rollers defining a chamber therebetween with air being injected into the chamber and out of four pervious rollers.
- the multi-nip suction press may comprise six rollers defining a chamber therebetween with air being injected into the chamber and out of four pervious rollers.
- rollers in accordance with the invention there may be one roller fixed centrally, three plain rollers at substantially 120 degree locations in external nip contact therewith, two pervious rollers each in nip contact with two of the three plain rollers and one sealing roller in nip contact with two of the three plain rollers whereby to define chamber means at substantially 120 degree directions outside the roller fixed centrally.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Claims (5)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA381190 | 1981-07-06 | ||
CA000381190A CA1161678A (fr) | 1981-07-06 | 1981-07-06 | Presse coucheuse a ventouses |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0069667A2 EP0069667A2 (fr) | 1983-01-12 |
EP0069667A3 EP0069667A3 (en) | 1984-09-12 |
EP0069667B1 true EP0069667B1 (fr) | 1988-11-30 |
Family
ID=4120372
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP82401255A Expired EP0069667B1 (fr) | 1981-07-06 | 1982-07-05 | Presse aspirante à plusieurs interstices de pressage |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0069667B1 (fr) |
JP (1) | JPS5942118B2 (fr) |
CA (1) | CA1161678A (fr) |
DE (1) | DE3279248D1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19946971A1 (de) * | 1999-09-30 | 2001-04-05 | Voith Paper Patent Gmbh | Vorrichtung zur Entwässerung einer Materialbahn |
US6692008B2 (en) | 2002-02-04 | 2004-02-17 | Voith Paper Patent Gmbh | Sealing arrangement |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4124942A (en) * | 1975-04-09 | 1978-11-14 | Valmet Oy | Method and apparatus for controlling the moisture content of a web of sheet material |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB744084A (en) * | 1953-06-17 | 1956-02-01 | Millspaugh Ltd | Improvements in or relating to paper-making machines |
FR1128534A (fr) * | 1954-04-10 | 1957-01-07 | Millspaugh Ltd | Machine à papier comportant des sections de pressage successives |
DE2166603A1 (de) * | 1971-07-31 | 1974-12-05 | Mara Anstalt | Lagerung fuer die zylindrische saugwalze eine nasspresse |
FI772143A (fi) * | 1977-07-08 | 1979-01-09 | Tampella Oy Ab | Laongzonspress foer pappersmaskin |
-
1981
- 1981-07-06 CA CA000381190A patent/CA1161678A/fr not_active Expired
-
1982
- 1982-07-05 DE DE8282401255T patent/DE3279248D1/de not_active Expired
- 1982-07-05 EP EP82401255A patent/EP0069667B1/fr not_active Expired
- 1982-07-06 JP JP11760782A patent/JPS5942118B2/ja not_active Expired
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4124942A (en) * | 1975-04-09 | 1978-11-14 | Valmet Oy | Method and apparatus for controlling the moisture content of a web of sheet material |
Also Published As
Publication number | Publication date |
---|---|
DE3279248D1 (en) | 1989-01-05 |
EP0069667A3 (en) | 1984-09-12 |
CA1161678A (fr) | 1984-02-07 |
EP0069667A2 (fr) | 1983-01-12 |
JPS5865092A (ja) | 1983-04-18 |
JPS5942118B2 (ja) | 1984-10-12 |
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