US3460467A - Wet presses - Google Patents

Wet presses Download PDF

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Publication number
US3460467A
US3460467A US604857A US3460467DA US3460467A US 3460467 A US3460467 A US 3460467A US 604857 A US604857 A US 604857A US 3460467D A US3460467D A US 3460467DA US 3460467 A US3460467 A US 3460467A
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United States
Prior art keywords
roll
channels
rolls
plates
plate
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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
Application number
US604857A
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English (en)
Inventor
Olof Birger Nystrom
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Valmet AB
Original Assignee
Sunds AB
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Publication date
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Publication of US3460467A publication Critical patent/US3460467A/en
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    • 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
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/74—Pulp catching, de-watering, or recovering; Re-use of pulp-water using cylinders
    • D21F1/78—Pulp catching, de-watering, or recovering; Re-use of pulp-water using cylinders with pressure
    • 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
    • B30B9/20—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 rotary pressing members, other than worms or screws, e.g. rollers, rings, discs
    • 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
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water

Definitions

  • the present invention has for its object to eliminate the aforesaid drawbacks.
  • the improvement according to the invention is characterized in that at least one of the press rolls is provided with one or more groups of channels arranged one after the other with respect to the axial direction of the roll, each of said channels extending all around the roll and being preferably unbroken, radially extending partition walls being provided between said channels, said partition walls constituting, at their outer peripheries, supports for a pervious, preferably perforated shell plate, each of said groups of channels being separated from the neighbouring groups of channels by radially extending walls, to which the respective appertaining shell plate of each group of channels is secured by means of an unbroken, or substantially unbroken, weld which is common to every two juxtaposed shell plates.
  • FIGURE 1 shows a known wet press of the type to which the present invention refers primarily, FIGURE 2 showing a partial cross sectional view of the press rolls, on an enlarged scale as compared with FIGURE 1, FIGURE 3 showing a cross sectional view along the line 33 of FIGURE 2, FIGURE 4 showing a cross sectional view of a particular way of joining, in accordance with the invention, the two ends of a shell plate, and FIGURE 5 showing a cross sectional view of a special scraping device according to the invention.
  • the invention refers to the type of wet presses, appearing from FIGURE 1, i.e. presses of the kind having two, or more, roll-shaped press members, each of which ex- 3,460,467 Patented Aug. 12, 1969 "ice poses part of its surface towards one (or more) chamber, or vat, which tightens against the rolls and which, under an excess pressure, amounting to 0.22.0 kg./sq. cm., is kept filled with a fiber suspension of 0.56% consistency. Good operating results have been obtained at an initial consistency of about 4% of the fibrous suspension and at an excess pressure, amounting to about 0.5 kg./ sq.
  • FIGURES 1 and 2 which is provided with two rolls 1 and 2 and the vat of which is designated by 3.
  • the fibrous suspension is supplied to the vat through the short feed pipe 4.
  • each roll picks up a layer of pulp, not shown in the drawing, said layer during its upward move ment being compressed by the rolls to form one single web of pulp. It is then important that the pressed out liquid, which flows into each roll through the perforations provided therein, be led away in such a manner that it will not re-wet the web of pulp after the nip.
  • the rolls 1, 2 are equipped with rings 6 extending all around the rolls and serving as supporting or carrying members, channels 7 being formed between said rings, said channels likewise extending all around the rolls and preferably having outwardly widening walls extending from a bowl-shaped bottom at a clearance angle of, for example, 20.
  • the pressed out liquid flows downwards and moves on into openings provided in the body 9 of the roll and extending about radially thereof or, as shown in FIGURE 2, into openings 8 directed obliquely downwards at an angle of a and further into the interior 10 of the body of the roll, from where the liquid is led away through the openings 11.
  • the channels 7, extending all around the roll may, however involve that a support, which is not so good, is obtained for the perforated plate.
  • a support which is not so good
  • the spot-welding idea results in a durability which is not quite satisfactory in the above described embodiment and it is not suitable for use in connection with the embodiments of the rolls in accordance with the present invention, which thus has for its object to eliminate also this drawback. Therefore, a more reliable way of securing is proposed and is shown, in principle, in FIGURE 3.
  • the perforated plate 5 is applied to the body of the roll, is tightened around the latter and is welded together by one or more welds. After that a V-shaped, or similar chamfering is turned for the weld 12, which will thereby join two shell plates at the ring 6 and which preferably is made to extend continuously all the way around.
  • the V-shaped, or similar, cham-fering may also be made in the plates before applying them to the body of the roll. It is possible also to do completely without the chamfering, when thin plates are concerned, for example, plates of 2 mm. thickness, if the edges of the plates are placed in contact with each other or, when thick plates are concerned, for example, plates of 4-6 mm. thickness, if the edges of the plates are placed at a distance from each other. In order to increase the durability of the plate an edge zone 13 of 2-8 mm., preferably about 3, 4 or 5 mm., of the plate may be left unperforated near the weld.
  • the axial length of each plate should be of the order 500 mm., preferably 200-400 mm. and preferentially about 200 mm.., when the diameter of the roll amounts to about 600-1000 mm., or more,
  • said axial length should extend over a group of about -40, preferably about -25 and preferentially about channels 7 and partition walls 6.
  • FIGURE 4 shows how the two ends of 'a shell plate may be joined together.
  • the axial weld 14 is made against a fillet 15, which is mounted in a groove 16 in the ring 6.
  • the inevitable rolling out (increase in length) of the plates, which occurs after some time of use but which becomes greatly reduced because of the above described way of fixing the plates along their circumferential edges, by welding, by this way of performing the joining together of the ends of the plates will be distributed all around the roll and will result in a small increase of the diameter of the shell plate, such increase being uniform all the Way around.
  • each perforated plate must be adapted both to the demands for strength and to the demands for filtering properties.
  • the web of pulp is removed from the roll 2 by means of a doctor 17, is then conveyed, by means of the roll 1, to the right in the figure and after that is led away by way of the receiving table 18.
  • the doctor 17 may be constructed in the manner shown in FIGURE 5.
  • the doctor blade 19 is mounted in a holder 22, actuated by the spring 20 and turnable on a spindle 21.
  • the shell plate consists essentially of a number of section plates, each section plate covering a number of channels in the axial direction, said number being lower than the total number of channels on the roll, and in that each section plate is secured to the supporting surface of an adjacent ring by means of a substantially unbroken weld along the peripherally arranged sides of said section plate.
  • each channel has a bowl-shaped bottom.
  • channels are arranged in groups comprising from about 10 to about 40 channels, all of which are separated from each other by said walls.
  • each channel has a number of outlet passages directed inwards, preferably radially inwards, relatively to the roll, said passages serving for leading away to the interior of the roll the filtrate entering the passages.
  • the perforated plate is provided with a great number of regularly distributed holes, each having a diameter of 0.8-1.2 mm., and the pitch amounting to the double diameter of the hole, the thickness of each plate being from about 2 to about 6 mm.
  • An improved press roll pair in which at least one of the rolls is provided with a plurality of channels arranged after each other in the axial direction of said roll and adapted for a stream of filtrate and extending continuously around the periphery of the roll, said channels being confined in the axial direction by radially extending walls and peripherally around the roll arranged rings, said rings at their outer periphery constituting a supporting surface for a pervious, preferably perforated shell plate, sai'd pair of press rolls being associated with a doctor which is adapted to yield outwards with respect to the center of the roll and which is under an elastic pressure, whereby fibers pressed into the perforations are removed therefrom.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
US604857A 1966-01-25 1966-12-27 Wet presses Expired - Lifetime US3460467A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE00921/66A SE355990B (cs) 1966-01-25 1966-01-25

Publications (1)

Publication Number Publication Date
US3460467A true US3460467A (en) 1969-08-12

Family

ID=20257311

Family Applications (1)

Application Number Title Priority Date Filing Date
US604857A Expired - Lifetime US3460467A (en) 1966-01-25 1966-12-27 Wet presses

Country Status (6)

Country Link
US (1) US3460467A (cs)
JP (1) JPS4837542B1 (cs)
DE (1) DE1627962C3 (cs)
FI (1) FI59634C (cs)
FR (1) FR1511722A (cs)
SE (1) SE355990B (cs)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3730079A (en) * 1971-06-22 1973-05-01 Improved Machinery Inc Variable nip press having rolls maintained on parallel axes
US4147634A (en) * 1978-03-15 1979-04-03 Envirotech Corporation Deflector blade for rotary drum filter
EP0140990A1 (de) * 1983-11-08 1985-05-15 Braunschweigische Maschinenbauanstalt AG Vorrichtung zum Flüssigkeitsentzug von strangförmig anfallenden faserigen, verfilzten Materialien
WO1987006282A1 (en) * 1986-04-08 1987-10-22 Sunds Defibrator Aktiebolag Dewatering press
US4919824A (en) * 1988-06-29 1990-04-24 Henry Filters, Inc. Roller/squeezer deliquifier
WO2009038529A1 (en) * 2007-09-19 2009-03-26 Andritz Oy Device for dewatering of pulp

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT405420B (de) * 1997-05-26 1999-08-25 Andritz Patentverwaltung Vorrichtung zur entwässerung und wäsche von faserstoffsuspensionen
SE528002E (sv) * 2004-12-22 2009-03-03 Metso Paper Inc Valspress samt valskropp för pressvals

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1787937A (en) * 1928-02-16 1931-01-06 Dunn William Roll scraper for cane mills or the like
US2972378A (en) * 1955-06-23 1961-02-21 Josephu Augustinus Fr Henricus Treatment by compression of fibrocement wet sheet material and the like
US3105043A (en) * 1960-05-26 1963-09-24 Improved Machinery Inc Filter
US3217554A (en) * 1963-06-13 1965-11-16 Goodman Mfg Co Universal pulley

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE282781C (cs) *
DE18877C (de) * A. D. R. DUJARDIN in Lille Continuirlich wirkende Doppelwalzenpresse für Zuckerfabriken etc
US1032167A (en) * 1912-01-25 1912-07-09 Swan J Vernsten Continuous press.
DE614833C (de) * 1932-01-15 1935-06-19 J M Lehmann Fa Maschine zur Entoelung von Kakaomasse

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1787937A (en) * 1928-02-16 1931-01-06 Dunn William Roll scraper for cane mills or the like
US2972378A (en) * 1955-06-23 1961-02-21 Josephu Augustinus Fr Henricus Treatment by compression of fibrocement wet sheet material and the like
US3105043A (en) * 1960-05-26 1963-09-24 Improved Machinery Inc Filter
US3217554A (en) * 1963-06-13 1965-11-16 Goodman Mfg Co Universal pulley

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3730079A (en) * 1971-06-22 1973-05-01 Improved Machinery Inc Variable nip press having rolls maintained on parallel axes
US4147634A (en) * 1978-03-15 1979-04-03 Envirotech Corporation Deflector blade for rotary drum filter
AU566961B2 (en) * 1983-11-08 1987-11-05 Braunschweigische Maschinenbauanstalt A.G. Apparatus for the withdrawal of liquid from fibrous intertwined material
EP0140990A1 (de) * 1983-11-08 1985-05-15 Braunschweigische Maschinenbauanstalt AG Vorrichtung zum Flüssigkeitsentzug von strangförmig anfallenden faserigen, verfilzten Materialien
EP0144596A2 (de) * 1983-11-08 1985-06-19 Braunschweigische Maschinenbauanstalt AG Vorrichtung zum Flüssigkeitsentzug von strangförmig anfallenden faserigen, verfilzten Materialien
EP0144596A3 (en) * 1983-11-08 1985-07-24 Braunschweigische Maschinenbauanstalt Ag Apparatus for eliminating liquids from strands of felted fibrous materials
US4589923A (en) * 1983-11-08 1986-05-20 Braunschweigische Maschinenbauanstalt Apparatus for removing liquid from fibrous materials
WO1987006282A1 (en) * 1986-04-08 1987-10-22 Sunds Defibrator Aktiebolag Dewatering press
US4861433A (en) * 1986-04-08 1989-08-29 Sunds Defibrator Aktiebolag Dewatering press with perforated metal outer shell and resilient elastic mounting means
AU596841B2 (en) * 1986-04-08 1990-05-17 Sunds Defibrator Aktiebolag Dewatering press
US4919824A (en) * 1988-06-29 1990-04-24 Henry Filters, Inc. Roller/squeezer deliquifier
WO2009038529A1 (en) * 2007-09-19 2009-03-26 Andritz Oy Device for dewatering of pulp
US20100282664A1 (en) * 2007-09-19 2010-11-11 Jonas Avidson Device for dewatering of pulp

Also Published As

Publication number Publication date
SE355990B (cs) 1973-05-14
FR1511722A (fr) 1968-02-02
FI59634B (fi) 1981-05-29
DE1627962A1 (de) 1970-05-14
DE1627962C3 (de) 1981-05-07
FI59634C (fi) 1981-09-10
JPS4837542B1 (cs) 1973-11-12
DE1627962B2 (de) 1980-08-07

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