WO1996025289A1 - Dispositif pour epaissir une pate a papier - Google Patents

Dispositif pour epaissir une pate a papier Download PDF

Info

Publication number
WO1996025289A1
WO1996025289A1 PCT/SE1996/000114 SE9600114W WO9625289A1 WO 1996025289 A1 WO1996025289 A1 WO 1996025289A1 SE 9600114 W SE9600114 W SE 9600114W WO 9625289 A1 WO9625289 A1 WO 9625289A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulp
passage
chamber
squeezing means
sleeve
Prior art date
Application number
PCT/SE1996/000114
Other languages
English (en)
Inventor
Bernt LJUNG
Original Assignee
Tetra Laval Holdings & Finance S.A.
LJUNG, Jolanta
LJUNG, Margaretha
LJUNG, Staffan
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Tetra Laval Holdings & Finance S.A., LJUNG, Jolanta, LJUNG, Margaretha, LJUNG, Staffan filed Critical Tetra Laval Holdings & Finance S.A.
Publication of WO1996025289A1 publication Critical patent/WO1996025289A1/fr

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
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • 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
    • B30B9/12—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 pressing worms or screws co-operating with a permeable casing
    • B30B9/121—Screw constructions
    • 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
    • B30B9/12—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 pressing worms or screws co-operating with a permeable casing
    • B30B9/18—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 pressing worms or screws co-operating with a permeable casing with means for adjusting the outlet for the solid

Definitions

  • the present invention relates to a device for thickening of pulp containing liquid, comprising a housing having a first and a second chamber, an inlet member for supplying the pulp to be thickened to the first chamber, a feed screw which is rotatably arranged in the first chamber for compressing the pulp during transport of the latter through the first chamber to the second chamber, and a first outlet member for discharging thickened pulp from the second chamber.
  • the device further comprises a hollow substantially cylindrical body which is arranged in the second chamber coaxially with the feed screw, a screen member arranged on the hollow body for draining liquid from the second chamber to the interior of the hollow body, a second outlet member for discharging liquid from the hollow body, and a pulp squeezing means surrounding the hollow body and arranged such that a passage, through which the pulp is displaced during operation from the first chamber to the first outlet member, is formed between the squeezing means and the hollow body.
  • the screen member extends in said passage and the squeezing means is adapted to successively reduce the cross-section area of the passage as seen in the direction of movement of the pulp through the passage, whereby pulp passing through the passage is squeezed to drain liquid through the screen member.
  • a device of this kind is known from WO 93/23238 and is in a conventional manner provided with an outer statio ⁇ nary screen member, which surrounds the feed screw for draining liquid from the first chamber.
  • an outer statio ⁇ nary screen member which surrounds the feed screw for draining liquid from the first chamber.
  • the screen member of the hollow body serves to drain said inner pulp portion from liquid, when the pulp passes the second chamber.
  • the squeezing means is constituted by a conical surface on a stationary outer wall.
  • said conical surface of the known device has the drawback that the pulp is more or less efficiently dewatered depending on the kind of pulp used, because of the fact that the conicity of the conical surface is always the same.
  • the selected conicity of the conical surface cannot be the optimum for all of the various kinds of pulp that may be desired to thicken by means of the known device.
  • the known device would have to be disassembled, in order to enable removal of said pulp plug.
  • the object of the present invention is to provide a device of the kind here present, with which the pulp can be thickened more efficiently than the known device and in which a pulp plug can be easily removed without need for disassembling the device.
  • This object is obtained by means of a device of the kind initially described, which is characterized in that the squeezing means is adjustable for changing the total reduction of the cross-section area of the passage, whereby an optimum thickening of the pulp can be obtained by a correct adjustment of the squeezing means.
  • the squeezing means is suitably adjustable between at least one operative position, in which the cross-section area of the passage is successively reduced, and an inoperative position, in which the cross-section area of the passage is not reduced along the passage as seen in the direction of movement of the pulp through the passage.
  • a pulp plug would be formed in the passage when the squeezing means is in its operative position, the pulp plug can easily be released by adjusting the compressing means to its inoperative position.
  • the squeezing means forms a substantially conical inner surface, which is coaxial with the hollow cylindrical body, when the squeezing means is adjusted to said operative position, and a substantially cylindrical inner surface, which is coaxial with the hollow cylindrical body, when the squeezing means is adjusted to said inoperative position.
  • the squeezing means may suitably comprise a cylindrical sleeve, which is coaxial with the hollow cylindrical body and which is provided with notches extending axially along a part of the sleeve from one end of the sleeve, whereby radially biassing tongue- shaped members of the sleeve are formed between the notches, and an adjusting means adapted to bend the tongue-shaped members radially inwardly for forming said conical inner surface.
  • the adjustment means may suitably comprise an annular member which extends around the sleeve at said one end of the sleeve and which is contractible for bending the tongue-shaped members radially inwardly.
  • the annular member may comprise a plurality of separate sections, which are distributed along the circumference of the annular member and spaced apart from each other, and adjustment members interconnecting adjacent sections in the circum- ferential direction of the annular member, the distances in said circumferential direction between adjacent sections being adjustable by means of the adjustment members.
  • figure 1 shows a longitudinal section through a device according to the invention
  • figure 2 shows a section through an enlarged detail of the device according to figure 1
  • figure 3 shows a front view of a squeezing means of the device according to figure 1
  • figure 4 shows a view of a section along the line IV-IV in figure 3.
  • Figure 1 shows a device according to the invention, usually called a screw press, for thickening of preferably paper pulp, comprising an elongated housing 1 having a first chamber 2, in which a feed screw 3 is arranged, and a second chamber 4, through which a shaft 5 of the feed screw 3 extends from the outlet end 6 of the feed screw 3.
  • the housing 1 is provided with an inlet member 7 for supplying pulp to be thickened in the chamber 2 at the inlet end 8 of the feed screw, and an outlet member 9 for discharging thickened pulp from the chamber 4.
  • the feed screw 3 has a core 10 with circular cross-section and with a cross-section area that increases along the feed screw 3 from the inlet end 8 to the outlet end 6 of the feed screw 3, whereby the space 11 between adjacent screw flanks 12 reduces in the feed direction of the feed screw 3.
  • the chamber 2 is confined by a cylindrical wall 13, which is provided with screen holes 14 for draining liquid from the chamber 2.
  • An outlet member 15 is arranged for discharging the liquid that passes through the s ⁇ reen holes 14.
  • the shaft 5 forms a hollow cylindrical body 16, the outer diameter of which is the same as the outer diameter of the core 10 at the outlet end 6 of the feed screw 3.
  • the body 16 forms an annular chamber 17, which communicates with the chamber 4 through an annular opening in the body 16.
  • a cylindrical screen member 18 extends around said annular opening of the body 16 and axially along the body from the outlet end of the feed screw 3 a distance into the chamber 4.
  • the screen member 18 is attached to the body 16 so that it is rotatable together with the shaft 5.
  • the screen member 18 can be arranged stationary in the housing 1 and not as a part of the shaft 5.
  • the screen member 18 may also be formed by providing the circumferential wall of the cylindrical hollow body 16 with perforations which serve as screen holes.
  • an outlet member 19 for discharging liquid from the chamber 17 of the hollow body 16 comprising a wall portion 20, which extends around the body 16 at the remote end of the latter relative to the feed screw 3 and which seals against the body 16.
  • the wall portion 20 forms with the housing an outlet chamber 21, which communicates with the exterior of the device through an outlet 22.
  • the chamber 17 of the body 16 communicates with the outlet chamber 21 through a number of passages 23 in the body 16 distri- ubbed around the circumference of the body 16.
  • a pulp squeezing means 24 which surrounds the body 16, an annular passage 25 being formed between the squeezing means 24 and the body 16.
  • the squeezing means 24 comprises a cylindrical metallic sleeve 26 which is provided with notches 27, extending axially along a part of the sleeve 26 from one end of the sleeve 26, whereby radially biassing tongue-shaped members 28 of the sleeve 26 are formed between the notches 27, and an adjustment means 29 adapted to bend the tongue-shaped members 28 radially inwardly (figures 3 and 4).
  • the adjustment means 29 comprises an annular member 30 which extends around the sleeve 26 at said one end of the latter and which is contractible for bending the tongue-shaped members 28 radially inwardly, so that the inner surface of the sleeve 26 becomes conical.
  • the annular member 30 comprises four separate sections 31, which are distri ⁇ ubbed along the circumference of the annular member 30 and spaced apart from one another, and four adjustment members in the form of screws 32, which interconnect adjacent sections 31 in the circumferential direction of the annular member 30. By adjusting the screws 32 a desired conicity of the inner surface of the sleeve 26 is achieved.
  • the sleeve 26 is provided with a flange 33, which is attached to the housing 1 by means of bolt joints not shown, so that the sleeve 26 is coaxial with the cylindrical body 16.
  • the adjustment means may comprise two or more wires which are applied on the tongue-shaped members 28 and extending at least partly around the sleeve 26. By stretching the wires the desired conicity of the inner surface of the sleeve 26 can be achieved.
  • the adjustment means may comprise hydraulic devices, which are controllable by hydraulic pressure for providing the desired conicity of the inner surface of the sleeve 26.
  • the shaft 5 is rotated by any suitable drive motor, for instance by an electrical motor, and the pulp to be thickened is supplied to the chamber 2 via the inlet member 7.
  • the feed screw 3 feeds the pulp under compression of the latter through the chamber 2, whereby liquid from a radially outer portion of the pulp is pressed through the screen holes 14 to the outlet member 15.
  • the resulted thickened pulp which enters into the passage 25 is further thickened by means of the squeezing means 24.
  • the conical inner surface of the sleeve 26 of the squeezing means 24 has a predetermined conicity which is adjusted by means of the screws 32.
  • the pulp passes through the passage 25, the cross- section area of which reduces because of the conical inner surface of the sleeve 26, as seen in the feed direction of the pulp, the pulp is squeezed between the squeezing means 24 and the screen member 18.
  • the radially inner portion of the pulp which is more wet than said outer portion of the pulp, is further thickened by liquid being drained from said inner portion of the pulp through the screen member 18 into the annuler chamber 17. From the chamber 17 the liquid flows further to the outlet chamber 21 via the passages 23 and finally out of the device via the outlet 22.
  • the resulted thickened pulp leaving the passage 25 is discharged from the device via the outlet member 9.
  • the latter can be easily released by moving the sections 31 of the annular member 30 away from one another, so that the tongues 28 of the sleeve 26 are biassed back and form the original cylindrical inner surface of the sleeve 26.
  • the sleeve 26 may be designed somewhat conical in an unloaded condition, so that the tongues 28 diverge from one another as seen in the feed direction of the pulp, to further facilitate release of blocking pulp.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)

Abstract

Une presse à vis pour épaissir une pâte à papier comprend une vis d'alimentation (3), un corps creux sensiblement cylindrique (16) qui est coaxial avec la vis d'alimentation et qui est disposé derrière la vis d'alimentation quand on regarde dans la direction d'alimentation de la vis d'alimentation et un élément de tamis (18) disposé sur le corps creux pour permettre le passage du liquide de la pâte dans le corps. L'élément de tamis (18) est entouré par un moyen (24) de compression de la pâte et un passage (25) par lequel la pâte est déplacée en opération est situé entre le corps et le moyen de compression de la pâte. Le moyen (24) de compression est conçu pour diminuer successivement la section transversale du passage (25) suivant sa longueur, si bien que la pâte est pressée entre le moyen de compression et l'élément de tamis quand la pâte transite par le passage et le liquide est drainé de la pâte vers l'intérieur du corps à travers l'élément de tamis (18). Selon l'invention, le moyen de compression est ajustable pour changer la diminution totale de la section transversale du passage.
PCT/SE1996/000114 1995-02-14 1996-02-02 Dispositif pour epaissir une pate a papier WO1996025289A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9500526-0 1995-02-14
SE9500526A SE9500526D0 (sv) 1995-02-14 1995-02-14 Anordning för förtjockning av massa

Publications (1)

Publication Number Publication Date
WO1996025289A1 true WO1996025289A1 (fr) 1996-08-22

Family

ID=20397202

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/000114 WO1996025289A1 (fr) 1995-02-14 1996-02-02 Dispositif pour epaissir une pate a papier

Country Status (2)

Country Link
SE (1) SE9500526D0 (fr)
WO (1) WO1996025289A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103831989A (zh) * 2014-02-20 2014-06-04 安德里茨（中国）有限公司 螺旋压榨机
WO2020057038A1 (fr) * 2018-09-17 2020-03-26 北京环境工程技术有限公司 Dispositif de séparation par extrusion et de purification
US11298903B2 (en) * 2016-11-30 2022-04-12 Franz Derflinger, Sr. Device for continuously pressing liquid out of a suspension

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2036597A5 (en) * 1969-03-26 1970-12-24 Parr Peter Expressing grape juice
SE421188B (sv) * 1973-11-27 1981-12-07 Thune Eureka As Mottrycksanordning for skruvpress
SE456149B (sv) * 1987-02-18 1988-09-12 Hedemora Ab Forfarande och anordning for avvattning och pressning av material medelst en skruvpress
WO1993023238A1 (fr) * 1992-05-15 1993-11-25 Andritz-Patentverwaltungs-Gesellschaft M.B.H. Presse a vis

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2036597A5 (en) * 1969-03-26 1970-12-24 Parr Peter Expressing grape juice
SE421188B (sv) * 1973-11-27 1981-12-07 Thune Eureka As Mottrycksanordning for skruvpress
SE456149B (sv) * 1987-02-18 1988-09-12 Hedemora Ab Forfarande och anordning for avvattning och pressning av material medelst en skruvpress
WO1993023238A1 (fr) * 1992-05-15 1993-11-25 Andritz-Patentverwaltungs-Gesellschaft M.B.H. Presse a vis

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103831989A (zh) * 2014-02-20 2014-06-04 安德里茨（中国）有限公司 螺旋压榨机
US11298903B2 (en) * 2016-11-30 2022-04-12 Franz Derflinger, Sr. Device for continuously pressing liquid out of a suspension
WO2020057038A1 (fr) * 2018-09-17 2020-03-26 北京环境工程技术有限公司 Dispositif de séparation par extrusion et de purification

Also Published As

Publication number Publication date
SE9500526D0 (sv) 1995-02-14

Similar Documents

Publication Publication Date Title
DE4392041C1 (de) Schneckenpresse
EP0773100B1 (fr) Presse à vis pour la déshydratation de matières fibreuses
EP0629427A2 (fr) Dispositif de deshydratation du type à vis
DE202007007038U1 (de) Vorrichtung zum Entwässern von schütt- oder fließfähigem Aufgabegut durch Verdichtung
EP1572371B1 (fr) Centrifugeuse, en particulier separateur, pourvue de buses de sortie pour matieres solides et d'une protection contre l'usure
US7347140B2 (en) Screw press for separation of liquid from solid-liquid mixtures especially pulp suspensions
WO1996025289A1 (fr) Dispositif pour epaissir une pate a papier
JP4532722B2 (ja) スクリュウプレス
DE19718502A1 (de) Einrichtung zur Schlammentwässerung
DE202017007084U1 (de) Spindelpressenvorrichtung mit einer verbesserten CIP- (Clean in Place-) Anordnung
JP2638748B2 (ja) サイクロンおよびその排出量調整装置
US5341730A (en) Screw press having a plurality of throttle points and at least one cam movable transversely thereto
US5351612A (en) Water cooled sleeve
JP3124997B2 (ja) スクリーン渣の脱水装置
JP2918447B2 (ja) スクリュウ式脱水機
US5713268A (en) Worm extruder for dewatering suspensions
EP1177389A1 (fr) Dispositif recepteur pour au moins un arbre monte de maniere etanche dans un carter
DE19525157C1 (de) Kupplung für Gas oder Wasser führende Rohre
US20190375178A1 (en) Device for continuously pressing liquid out of a suspension
EP0127736B1 (fr) Presse pour fabriquer des boulettes à partir de matières en vrac
EP1291462B1 (fr) Raccord par serrage dans un rouleau presseur à pince élargie
AT412857B (de) Schneckenpresse zum abtrennen von flüssigkeit aus feststoff-flüssigkeits-gemischen, insbesondere faserstoffsuspensionen
US6168410B1 (en) Apparatus for the expansion and/or heat treatment of oleo resinous material
AT407973B (de) Schneckenpresse
KR200189151Y1 (ko) 자동 변속기용 킥다운 브레이크

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): CA FI JP NO US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase