WO1998059109A1 - Cylindre de classage - Google Patents

Cylindre de classage Download PDF

Info

Publication number
WO1998059109A1
WO1998059109A1 PCT/SE1998/001038 SE9801038W WO9859109A1 WO 1998059109 A1 WO1998059109 A1 WO 1998059109A1 SE 9801038 W SE9801038 W SE 9801038W WO 9859109 A1 WO9859109 A1 WO 9859109A1
Authority
WO
WIPO (PCT)
Prior art keywords
screening
cylinder
rods
screening cylinder
depression
Prior art date
Application number
PCT/SE1998/001038
Other languages
English (en)
Inventor
Alf LINDSTRÖM
Original Assignee
Sunds Defibrator Industries Ab
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 Sunds Defibrator Industries Ab filed Critical Sunds Defibrator Industries Ab
Priority to AU79451/98A priority Critical patent/AU7945198A/en
Publication of WO1998059109A1 publication Critical patent/WO1998059109A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
    • D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
    • D21D5/02—Straining or screening the pulp
    • D21D5/16—Cylinders and plates for screens

Definitions

  • This invention relates to a screening cylinder for an apparatus for screening suspensions of lignocellulosic fiber material.
  • the screening usually is carried out in screening means with a screening cylinder, which can be stationary or rotary.
  • the screening cylinder is provided with holes or slits, through which the fibers, but not the impurities, can pass.
  • Screening cylinders of this kind usally are manufactured by drilling holes or milling slits in a metal sheet, which is then formed to a cylinder.
  • the holes or slits In order to obtain an open area as great as possible, i.e. that portion of the surface of the screening cylinder which is perforated, the holes or slits must be placed densely.
  • a screening cylinder Another way of forming a screening cylinder is to manufacture it of rods, which are held together by support rings, so that between the rods gaps are formed, which extend along the whole length of the cylinder.
  • a screening cylinder has many advantages over a conventionally slitted screening cylinder, for example a greater open area and a higher selectivity in respect of shives separation and fractionating.
  • the rods can be formed of a metal sheet by making a great number of parallel grooves in the sheet.
  • every rod is provided with a depression whereby the geometry is maintained for a longer time in spite of wear. Moreover, the turbulence creating geometry is improved, and thereby the capacity and efficiency as well as the runability of the screening means are improved.
  • Fig. 1 shows a screening cylinder according to the invention.
  • Figs. 2-7 are cross-sections through a portion of a screening cylinder according to different embodiments.
  • the screening cylinder 10 is formed of a great number of substantially axial rods 11, which between themselves form gaps 12 extending along the entire length of the cylinder.
  • the rods 11 are placed in such a way that a screening surface is formed where the edge portions 13, 14 of the rods 11 which define the gaps 12, are located at the same or different heights. If the edge portions are located at different heights, the edge portions on both sides of a gap preferably are arranged so, that the upstream edge is higher than the downstream edge, seen in the intended flow direction of the suspension relative to the screening cylinder. This can be achieved by bevel grinding or inclination of these portions.
  • the upper surface of these rods 11 shall be provided with at least one depression 15 between the edge portions 13, 14.
  • This depression 15 can have different configuration, as appears from the embodiments shown in Figs. 2-7.
  • the depression, in a cross-sectional view, can be rectangular, U-shaped, N-shaped, etc. It is also possible to provide several depressions between the edge portions 13, 14 of the rods 11.
  • the upper surface of the rods 11 preferably is oblique so as to form an angle ⁇ with the circumferential direction of the screemng surface, where ⁇ is between 0-45°, preferably 10-30°.
  • the difference in level between opposed edge portions 13, 14 should be between 0 and 5 mm.
  • the width of the gaps 12 shall be 0,05 - 1,0 mm, preferably 0,1 - 0,5 mm, and the width of the rods shall be 0,5 - 7 mm.
  • the depressions 15 should have a depth of between 0,5 and 5 mm, preferably 1 and 2 mm, and leave edge portions with a width of between 0 and 3 mm, preferably 1 and 2 mm.
  • the rod-shaped portions 11 are held together by a number of overall support rings 16 arranged on the outside of the cylinder.
  • the overall support rings 16 are arranged on the inside of the cylinder.
  • the turbulence creating geometry is improved, which promotes the capacity and efficiency of the screening cylinder.
  • the geometry is maintained substantially even when the edge portions 13, 14 of the rods 11 get worn.
  • the turbulence created by the design and location of the rods also implies, that smaller gap widths can be used with maintained capacity, which yields a cleaner pulp without using more or greater screens.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Preliminary Treatment Of Fibers (AREA)

Abstract

L'invention concerne un cylindre de classage destiné aux suspensions de classage de matières fibreuses ligno-cellulosiques. Le cylindre de classage (10) est constitué de barres (11) formant entre elles des intervalles (12) s'étendant sur toute la longueur du cylindre (10). Ces barres (11) sont assemblées par un certain nombre d'anneaux supports globaux (16) placés sur le cylindre. Pour améliorer l'efficacité du cylindre de classage, la face supérieure des barres (11) est améliorée par au moins une dépression (15) située entre les parties bords (13, 14) des barres (11).
PCT/SE1998/001038 1997-06-25 1998-06-02 Cylindre de classage WO1998059109A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU79451/98A AU7945198A (en) 1997-06-25 1998-06-02 Screening cylinder

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9702473A SE509543C2 (sv) 1997-06-25 1997-06-25 Siltrumma utformad med stavar
SE9702473-1 1997-06-25

Publications (1)

Publication Number Publication Date
WO1998059109A1 true WO1998059109A1 (fr) 1998-12-30

Family

ID=20407545

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1998/001038 WO1998059109A1 (fr) 1997-06-25 1998-06-02 Cylindre de classage

Country Status (3)

Country Link
AU (1) AU7945198A (fr)
SE (1) SE509543C2 (fr)
WO (1) WO1998059109A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2477710A1 (fr) * 2009-09-14 2012-07-25 GEA Houle Inc. Tambour de separation de liquide, separateur pourvu de ce tambour et kit de montage associe

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3327422A1 (de) * 1983-07-29 1985-02-07 J.M. Voith Gmbh, 7920 Heidenheim Sieb, insbesondere fuer die sortierung von auf der grundlage von altpapier hergestellten fasersuspensionen
EP0624684A1 (fr) * 1993-05-14 1994-11-17 Aktiebolaget Knutsilplatar Cylindre pour épurateur

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3327422A1 (de) * 1983-07-29 1985-02-07 J.M. Voith Gmbh, 7920 Heidenheim Sieb, insbesondere fuer die sortierung von auf der grundlage von altpapier hergestellten fasersuspensionen
EP0624684A1 (fr) * 1993-05-14 1994-11-17 Aktiebolaget Knutsilplatar Cylindre pour épurateur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2477710A1 (fr) * 2009-09-14 2012-07-25 GEA Houle Inc. Tambour de separation de liquide, separateur pourvu de ce tambour et kit de montage associe
EP2477710A4 (fr) * 2009-09-14 2013-03-13 Gea Houle Inc Tambour de separation de liquide, separateur pourvu de ce tambour et kit de montage associe

Also Published As

Publication number Publication date
SE9702473L (sv) 1998-12-26
SE509543C2 (sv) 1999-02-08
SE9702473D0 (sv) 1997-06-25
AU7945198A (en) 1999-01-04

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