US3669011A - Method of and apparatus for continuous extraction of liquid from a pasty suspension - Google Patents

Method of and apparatus for continuous extraction of liquid from a pasty suspension Download PDF

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Publication number
US3669011A
US3669011A US47037A US3669011DA US3669011A US 3669011 A US3669011 A US 3669011A US 47037 A US47037 A US 47037A US 3669011D A US3669011D A US 3669011DA US 3669011 A US3669011 A US 3669011A
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United States
Prior art keywords
strip
suspension
liquid
zones
support
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Expired - Lifetime
Application number
US47037A
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English (en)
Inventor
Guy Jacquelin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CENTRE TECH IND PAPIER
CENTRE TECHNIQUE DE L'IND DES PAPIERS CARTONS ET CELLULOSES
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CENTRE TECH IND PAPIER
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Publication of US3669011A publication Critical patent/US3669011A/en
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Expired - Lifetime legal-status Critical Current

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    • 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
    • D21F3/029—Wet presses using special water-receiving belts

Definitions

  • ABSTRACT A device for the continuous extraction of a liquid from a pasty suspension arranged in a layer on a support strip comprising elastically deformable permeable zones separated by impermeable zones, the permeable zones putting into communication with each other the two faces of the strip are each subjected to a progressive contraction moving from the face in contact with the suspension towards the free face of the support.
  • the compression pressure is obtained by passing the suspension-strip combination between press cylinders.
  • FIG. 2 4 Claims, 3 Drawing Figures I PATENTEDJuu 1 a 1972 FIG. 2
  • the present invention relates to an apparatus for continuous extraction of a liquid contained in a pasty suspension.
  • a conventional method of extraction consists of compressing, between the cylinders of a press, the pasty suspension arranged in a layer on a permeable support. If so desired, thissuspension can be previously thickened by filtration.
  • the present invention is intended to obtain a systematic separation of the liquid expelled from the pasty layer by preventing its return movements at the outlet of the press.
  • a method of continuous extraction of a liquid contained in a pasty suspension, previouslythickened by filtration if so required, consists of compressing between press cylinders, the suspension arranged in a layer on apermeable support.
  • permeable and elastically deformable zones are subjected to a progressive contraction; these zones provided in the support between fluid-tight zones, put the two faces of the support into communication, the said contraction progressing in the center of each of the permeable zones, from the face in contact with the suspension to the free face of the support.
  • each permeable zone there exists in each permeable zone a depression upstream of the contracted section, which is located downstreamof the press cylinders, namely in the part of the .permeable zone locatedon the suspension side, while an over-pressure-.existsdownstream of this contracted section, which is located upstream of the press cylinders, namely in the part of the permeable zone located on the side of the free face.
  • the upstream liquid is thus sucked towards the contracted section while the downstream liquid is expelled towards the free face of the support, in an irreversible manner.
  • the invention also relates to a flexible, endless support-strip intended for carrying the method described into effect.
  • a strip according to the invention comprises elastically deformable permeable zones separated by fluid-tight zones, the said permeable zones putting the two faces of the strip into communication and being capable of having an oblique direction with respect to the normal to the planes of these two faces.
  • the method of operation of a support-strip of this kind is as follows:
  • the strip is caused to move parallel to its axis, and the active side which supports the suspension layer passes between the press cylinders.
  • the permeable zones have an oblique direction with respect to the normal to the planes of the'two faces of the strip, either by their structure or by the effectof the action of the cylinders.
  • The-axis of .these zones oriented from the face in contact with the suspension towards the free face, forms an obtuse angle with the direction of movement of the strip, oriented in the direction of forward movement.
  • each oblique permeable zone is subjected to a contraction in its section located between the cylinders. Due to the forward movement of the strip and the obliquity previously referred to, this contraction progresses through each permeable zone from the face in contact with the suspension to the free face. As has already been explained, the liquid expelled by the compression of the suspension is thus irreversibly directed towards the free face of the strip. The liquid downstream of the contracted section is expelled towards this free face, while the upstream liquid is sucked towards this face.
  • the permeable zones may be constituted by a plurality'of parallel channels, having an oblique direction with respect to the normal to the planes of the two faces of the strip.
  • the progressive contraction which passes along these channels produces an actual pumping elTect on the liquid of the suspension.
  • the strip may be constituted by a succession of inclined thin porous plates separated from each other by thin inclined fluid-tight plates. It may also be formed by a plurality of small flexible tubes with a hollow core, suspended from a thin flexible strip pierced with holes facing the core of the said small flexible tubes. In the position of rest, these hollow-core tubes may be perpendicular to the faces of the strip, but at themoment of passing into the press they take-up an inclined direction which is essential for carrying the method described into effect.
  • an intermediate filtering fabric may be provided between the suspension layer and the support-strip.
  • FIG. 1 is a diagram intended to facilitate understanding of the principle of the apparatus according to the invention
  • FIGS.2 and 3 are partial views in perspective of two support-strips according to the invention.
  • An endless flexible strip of impermeable material of which one side is shown at 1 in F lG.l, comprises a plurality of oblique channels such as 2, putting its two faces 3 and 4 into communication.
  • the angle :1 shown in FIG. 1 between the axis of forward movement of the strip and the direction of the channels, is an obtuse angle.
  • the upper face 3 of the working side of the strip 1 carries a layer 5 of a pasty suspension which has been thickened by prior filtration.
  • the strip 1 which is given a movement of translation (from right to left in FIG.1), is intended-to pass between press cylinders 6 and 7 which subject the strip and the layer 5 to a local compression.
  • Means shown diagrammatically at 8 for collecting the extracted liquid are also provided underneath this strip 1.
  • the method of extraction of the liquid by means of this strip is as follows: at a given moment, the orifices (suspension side) of certain channels such as the channel 2a, reach the threshold of the zone compressed by the cylinders. The liquid expelled from this compressed zone passes through these orifices and flows out into the channels 2a.
  • the contracted section then progress in each of these channels towards the free face (channel 20).
  • the liquid located on the side of the face 4 with respect to thecontracted section is driven towards this face, while the liquid located on the side of the face 3 is sucked towards the contracted section.
  • the orifice on the side of the face 4 finally reaches the zone compressed by the cylinders (channel 2d); it is thus subjected to a contraction which blocks it, thus preventing the liquid extracted from being sucked towards the face 3 by a suction effect caused by the decompression of the suspension layer 5.
  • the channels are simply constituted by small tubes 9 with a hollow core, suspended underneath a thin flexible strip 10. In the position of rest, these tubes 9 are perpendicular to the plane of the strip 10, but they take-up an oblique direction, similar to that of the channels 2, at the moment of passage between the press cylinders.
  • the support-strip shown in FIG. 3 is formed by a juxtaposition of impermeable oblique plates 11 and porous oblique plates 12. These plates may be formed from a porous fabric.
  • an interposed filtering fabric so as to limit fouling of the strip or to reduce its imprints on the material to be concentrated.
  • a flexible support-strip comprising elastically deformable permeable zones separated by impermeable zones, said permeable zones putting into communication the two faces of said strip and being adapted to have an oblique direction with respect to a line perpendicular to the planes of said two faces.
  • a flexible support-strip as claimed in claim I in which said strip is formed by a succession of inclined porous sheets separated from each other by impermeable inclined sheets.

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  • Soy Sauces And Products Related Thereto (AREA)
  • Structure Of Belt Conveyors (AREA)
  • Filtration Of Liquid (AREA)
US47037A 1969-06-20 1970-06-17 Method of and apparatus for continuous extraction of liquid from a pasty suspension Expired - Lifetime US3669011A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR6920821A FR2030527A5 (enExample) 1969-06-20 1969-06-20

Publications (1)

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US3669011A true US3669011A (en) 1972-06-13

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US47037A Expired - Lifetime US3669011A (en) 1969-06-20 1970-06-17 Method of and apparatus for continuous extraction of liquid from a pasty suspension

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US (1) US3669011A (enExample)
CA (1) CA925358A (enExample)
FR (1) FR2030527A5 (enExample)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4826595A (en) * 1986-10-01 1989-05-02 Nordischer Maschinenbau Rud. Baader Gmbh & Co. Kg Apparatus for separating flowable constituents from a substance mixture
DE4411621A1 (de) * 1994-04-02 1995-10-05 Voith Sulzer Papiermasch Gmbh Preßmantel
US8871099B1 (en) * 2011-10-18 2014-10-28 Nu-Coal LLC Coal slurry dewatering arrangement

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI822425A7 (fi) * 1982-07-07 1984-01-08 Valmet Oy Menetelmä ja laite kuiturainan, etenkin paperi- tai kartonkirainan puristuskäsittelyssä.
FI882191A7 (fi) * 1988-03-30 1989-10-01 Albany Int Corp Foerfarande foer avvatning.

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4826595A (en) * 1986-10-01 1989-05-02 Nordischer Maschinenbau Rud. Baader Gmbh & Co. Kg Apparatus for separating flowable constituents from a substance mixture
DE4411621A1 (de) * 1994-04-02 1995-10-05 Voith Sulzer Papiermasch Gmbh Preßmantel
US8871099B1 (en) * 2011-10-18 2014-10-28 Nu-Coal LLC Coal slurry dewatering arrangement

Also Published As

Publication number Publication date
DE2030269B2 (de) 1973-02-08
FR2030527A5 (enExample) 1970-11-13
CA925358A (en) 1973-05-01
DE2030269A1 (de) 1971-01-07

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