EP0453348A1 - Tamis pour épurateur et classificateur de pâte à papier - Google Patents

Tamis pour épurateur et classificateur de pâte à papier Download PDF

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Publication number
EP0453348A1
EP0453348A1 EP91400922A EP91400922A EP0453348A1 EP 0453348 A1 EP0453348 A1 EP 0453348A1 EP 91400922 A EP91400922 A EP 91400922A EP 91400922 A EP91400922 A EP 91400922A EP 0453348 A1 EP0453348 A1 EP 0453348A1
Authority
EP
European Patent Office
Prior art keywords
screen
purifier
pulp
profile
classifier
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.)
Withdrawn
Application number
EP91400922A
Other languages
German (de)
English (en)
French (fr)
Inventor
Jean-Pierre Lamort
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.)
Kadant Lamort SAS
Original Assignee
E&M Lamort Fils SA
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 E&M Lamort Fils SA filed Critical E&M Lamort Fils SA
Publication of EP0453348A1 publication Critical patent/EP0453348A1/fr
Withdrawn legal-status Critical Current

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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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/18—Drum screens

Definitions

  • the present invention relates to a screen for a purifier or classifier of paper pulp, and to devices provided with such screens.
  • the sieves generally consist of a flat or cylindrical perforated surface on which a filter dough circulates, the surface being either subjected to vibrations (flat sieves), or swept by a blade which keeps the dough in motion and prevents clogging.
  • the characteristics of the sieves are very variable, in particular according to the initial cleanliness of the pulp to be treated (coarse pulp, pre-purification, fine purification), the average length of the fibers, the concentration of the pulp, the flow of pulp ...
  • the sieves can also be made with thin sheets.
  • a sieving surface constituted by the juxtaposition of U-shaped profiles, sheet metal of the order of 1 to 3 millimeters thick; in this document the bottom of the U is flat and the profiles are juxtaposed so as to form a substantially planar wall; this wall is then machined so as to present, as for sieves with a thick wall, slots or holes accompanied by known obstacles (ribs, grooves, etc.) made in the thickness of the sheet.
  • the invention aims to improve the latter type of sieve. It relates to a sieve for a purifier or classifier of paper pulp of the type constituted by the juxtaposition of elements with a U-shaped cross section in front of which a stirring blade circulates, characterized in that the bottom of the perforated U has a wavy profile with a rounded or angular crest so that the sieving surface in contact with the dough is very significantly increased.
  • the screen is a cylinder made from a sheet of thin thickness, preferably between 1 and 3 millimeters. It is formed of elements 1, folded in a general U shape, and juxtaposed so as to form a sieving wall 2.
  • the cylinder of FIG. 1 can be obtained from elements 1 of the same length, juxtaposed, curved and welded together, or else from an element 1 wound on itself, by forming turns adjacent.
  • the bottom 3 of the U is not flat but deformed longitudinally so as to present, from one wing 4 to the other 5, at least one rounded or angular ridge 20.
  • it then has between the two wings 4,5 a succession of at least two adjacent faces 6,7 adjacent perforated inclined with respect to the general plane 8 of the screen at an angle 12,13 between 0 and 90 °.
  • the bottom of the U thus has a shape at least in V ( Figure 3), or in W ( Figure 2), etc. symmetrical or not, the inclination of two opposite faces 6, 7 can be of the same value or different as shown in Figure 3.
  • the perforations, holes 10 or slots 9, are made on all the inclined faces of the bottom of the U; they are generally made before deformation of the bottom of the U, in particular when the slots are associated with a rib in order to obtain a profile of the obstacle type. However, they can also be produced after the corrugated profile has been formed, in particular when simple slots are produced.
  • This arrangement (of folding the bottom of the U) is to increase the sieving surface for the same width of the U-shaped element, that is to say for the same size of the sieve.
  • This increase in sieving surface means that the same quantity of dough can be processed more quickly.
  • FIG. 2 shows a W-shaped wavy profile with angular ridges. This provision is not limiting and the invention also relates to the profiles in V, or with rounded crest, symmetrical or not ( Figures 3 to 6).
  • the bottom of the U is folded into a symmetrical W shape.
  • the angles 14, 14 ′, 14 "formed between the inclined walls are equal, and of the order of 60 °. This arrangement makes it possible to double the surface 5 of the bottom of the U and therefore to double the surface of the sieve.
  • the wing moves in a direction approximately parallel to the longitudinal axis of the U-shaped elements, perpendicular to the slots 9 for example; the bottom of the U is therefore not at a constant distance from the wing; the top 15 of the top fold (s) of the V in the example of FIG. 2- is closer to the blade than the lateral end 17 of the fold.
  • the present embodiment describes a centripetal cylindrical sieve, but the invention is not limited to this operating mode and also relates to centrifugal sieves.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Filtration Of Liquid (AREA)
EP91400922A 1990-04-18 1991-04-05 Tamis pour épurateur et classificateur de pâte à papier Withdrawn EP0453348A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9004924A FR2661196B1 (fr) 1990-04-18 1990-04-18 Tamis pour epurateur et classificateur de pate a papier.
FR9004924 1990-04-18

Publications (1)

Publication Number Publication Date
EP0453348A1 true EP0453348A1 (fr) 1991-10-23

Family

ID=9395835

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91400922A Withdrawn EP0453348A1 (fr) 1990-04-18 1991-04-05 Tamis pour épurateur et classificateur de pâte à papier

Country Status (4)

Country Link
EP (1) EP0453348A1 (fi)
JP (1) JPH04222287A (fi)
FI (1) FI911865A (fi)
FR (1) FR2661196B1 (fi)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5417858A (en) * 1993-01-13 1995-05-23 Derrick Manufacturing Corporation Screen assembly for vibrating screening machine
US5417859A (en) * 1993-01-13 1995-05-23 Derrick Manufacturing Corporation Undulating screen for vibratory screening machine and method of fabrication thereof
US5921399A (en) * 1996-06-07 1999-07-13 Derrick Corporation Gumbo separator
US5958236A (en) * 1993-01-13 1999-09-28 Derrick Manufacturing Corporation Undulating screen for vibratory screening machine and method of fabrication thereof
US6000556A (en) * 1993-01-13 1999-12-14 Derrick Manufacturing Corporation Screen assembly for vibratory screening machine
EP1161308A1 (en) * 1998-12-23 2001-12-12 Thermo Black Clawson Inc. Papermaker's screen cylinder with helix screen element

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB519680A (en) * 1938-09-22 1940-04-03 James Walker Improvements in or relating to strainer plates and drums
GB2195911A (en) * 1986-10-08 1988-04-20 Ingersoll Rand Co Screening apparatus for pulp
WO1989012137A1 (en) * 1988-06-10 1989-12-14 Beloit Corporation Wave screen plate and manufacturing methods
EP0354846A1 (fr) * 1988-08-12 1990-02-14 E & M LAMORT Tamis pour épurateur et classificateur de pâte à papier

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB519680A (en) * 1938-09-22 1940-04-03 James Walker Improvements in or relating to strainer plates and drums
GB2195911A (en) * 1986-10-08 1988-04-20 Ingersoll Rand Co Screening apparatus for pulp
WO1989012137A1 (en) * 1988-06-10 1989-12-14 Beloit Corporation Wave screen plate and manufacturing methods
EP0354846A1 (fr) * 1988-08-12 1990-02-14 E & M LAMORT Tamis pour épurateur et classificateur de pâte à papier

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5876552A (en) * 1993-01-13 1999-03-02 Derrick Manufacturing Corporation Method of fabricating screen for vibratory screening machine
US5944993A (en) * 1993-01-13 1999-08-31 Derrick Manufacturing Corporation Screen assembly for vibrating screening machine
US5417793A (en) * 1993-01-13 1995-05-23 Derrick Manufacturing Corporation Undulating screen for vibratory screening machine and method of fabrication thereof
US5720881A (en) * 1993-01-13 1998-02-24 Derrick Manufacturing Corporation Screen assembly for vibrating screening machine
US5783077A (en) * 1993-01-13 1998-07-21 Derrick Manufacturing Corporation Undulating screen for vibratory screening machine
US5868929A (en) * 1993-01-13 1999-02-09 Derrick Manufacturing Corporation Screen assembly for vibrating screening machine
US5417859A (en) * 1993-01-13 1995-05-23 Derrick Manufacturing Corporation Undulating screen for vibratory screening machine and method of fabrication thereof
US6564947B2 (en) 1993-01-13 2003-05-20 Derrick Manufacturing Corporation Method of screening material utilizing a plurality of undulating screen assemblies
US5417858A (en) * 1993-01-13 1995-05-23 Derrick Manufacturing Corporation Screen assembly for vibrating screening machine
US5958236A (en) * 1993-01-13 1999-09-28 Derrick Manufacturing Corporation Undulating screen for vibratory screening machine and method of fabrication thereof
US6000556A (en) * 1993-01-13 1999-12-14 Derrick Manufacturing Corporation Screen assembly for vibratory screening machine
US6340089B1 (en) 1993-01-13 2002-01-22 Derrick Manufacturing Corporation Method of fabricating undulating screen for vibratory screening machine
US5921399A (en) * 1996-06-07 1999-07-13 Derrick Corporation Gumbo separator
EP1161308A1 (en) * 1998-12-23 2001-12-12 Thermo Black Clawson Inc. Papermaker's screen cylinder with helix screen element
EP1161308A4 (en) * 1998-12-23 2002-05-29 Thermo Black Clawson Inc SORTING CYLINDER FOR PAPER PRODUCTION WITH SPIRAL SORTING ELEMENT

Also Published As

Publication number Publication date
FR2661196A1 (fr) 1991-10-25
FI911865A (fi) 1991-10-19
FR2661196B1 (fr) 1992-07-17
JPH04222287A (ja) 1992-08-12
FI911865A0 (fi) 1991-04-17

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