EP0509873A1 - Geschlitzte Siebtrommel zum Filtrieren von Faserbrei und Verfahren zu seiner Herstellung - Google Patents

Geschlitzte Siebtrommel zum Filtrieren von Faserbrei und Verfahren zu seiner Herstellung Download PDF

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Publication number
EP0509873A1
EP0509873A1 EP92400936A EP92400936A EP0509873A1 EP 0509873 A1 EP0509873 A1 EP 0509873A1 EP 92400936 A EP92400936 A EP 92400936A EP 92400936 A EP92400936 A EP 92400936A EP 0509873 A1 EP0509873 A1 EP 0509873A1
Authority
EP
European Patent Office
Prior art keywords
wing
punching
adjacent
elements
wall
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.)
Ceased
Application number
EP92400936A
Other languages
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 EP0509873A1 publication Critical patent/EP0509873A1/de
Ceased 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/496—Multiperforated metal article making

Definitions

  • the present invention relates to a process for producing a cylindrical sieve with slots for purifiers and classifiers of paper pulp obtained from waste paper and the sieve produced according to this process.
  • These sieves are generally perforated cylinders mounted fixed in a closed volume comprising at least one inlet for dirty dough, one outlet for sieved dough, and one outlet for rejects.
  • the dough is stirred by one or more paddles which rotate at high speed in the immediate vicinity of the perforated surface.
  • sieves with holes or slits are used.
  • these perforations are usually accompanied by an obstacle which causes pulsations favoring sieving.
  • the perforations are usually produced by machining in a sheet of thickness of the order of a centimeter. However, since this machining presents great difficulties, the applicant has produced a screen from a sheet of thin thickness, of the order of 2 millimeters described in EP-A-354 846. This sieve is made up of U-shaped profiles joined next to each other and the bottom of which is perforated. The perforations are still obtained by machining (sawing bore) but the thinness of the wall significantly simplifies these operations.
  • a first objective of the invention aims to solve this problem.
  • a second objective is to improve the perforation process.
  • the perforation still represents a relatively long work station because the machining of the slots and obstacles comprises two saw passages followed by a deburring operation, on the other hand this machining, even if it removes a small amount of material taking into account the small thickness of the sheet, is important relative to this same thickness and weakens the resistance of the wall.
  • the subject of the present invention is a cylindrical screen for paper pulp purifier of the thin sheet type and consisting of a juxtaposition of U-shaped profiled elements produced in a metal strip characterized in that the element comprises a first wing , a bottom, followed by a second wing folded towards the outside of the U on itself so as to determine a space in the fold thus formed, intended to receive and hold the first wing of the adjacent element.
  • the invention also relates to the process for producing such a sieve, characterized in that a plurality of assemblies are assembled elements of the same length, the folded wing of each element engaging on the opposite wing of the neighboring element, the assembly forming a wall which is bent to form a cylinder, then the ends of the elements together.
  • the method is characterized in that the element is wound in a spiral or helix, each turn forming a turn, the turns being assembled by introducing the fold of the second wing on the end of the first wing. of the adjacent turn, or vice versa.
  • the invention also relates to the process for producing the slots of the sieve, characterized in that the U-shaped metal strip is first put, it is placed on a template and the bottom of the U is punched by means a knife, the end of which has a cutting edge perpendicular to the axis of the strip and a wedge profile, one of the faces of which is perpendicular to the punched surface and in that the punches are made from distance to distance at regular intervals.
  • the punching is not through and only forms a deformation whose profile has a wall perpendicular to the surface of the bottom of the U attacked by the knife followed by an inclined wall, the slot is obtained by a line saw to the right of the vertical wall.
  • the punching is through, it punctures the strip and cuts the slot, the width of which is determined by the depth of penetration of the knife.
  • the sieve is a cylinder 1 made up of identical, curved and juxtaposed longitudinal metal elements 2 in a U shape.
  • Element 2 is made of a thin metal strip or strip.
  • the strip is folded so that, in cross section, the element has a first wing 3, a bottom 4, followed by a second wing 5 folded outwards from the U on itself so as to determine a space 6 in the fold thus formed, intended to receive and hold the first wing 3 ′ of the adjacent element 2 ′.
  • the folded part 7 or flap of the second wing substantially covers the first adjacent wing 3 ′.
  • the flap extends over the entire height 8 of the flat part of the wing 3 ′. In this way the first wing is held in the fold of the adjacent second over its entire flat part.
  • a plurality of elements 2 of the same length are assembled, the folded wing 5 of each element engaging on the wing 3 ′ opposite to the neighboring element 2 ′; the assembly forms a wall which is bent to form a cylinder, then the ends of the elements are welded together.
  • the element 2 is wound in a spiral or helix, each turn forming a turn, the turns being assembled by introducing the space 6 of the fold of the second wing 5 onto the end of the first wing 3 ′ of the adjacent turn or vice versa.
  • the assembly can then be done both by bending the U-shaped element, the wings being oriented towards the outside of the cylinder (fig.3), that by bending it, the wings being oriented inward (fig. 4), which allows for indifferently a centrifugal or centripetal sieve, and this without needing to carry out a single welding.
  • the elements, before the bending and assembly operations, are perforated, the perforations possibly being holes or slots.
  • EP-A-0.354.846 discloses a perforation process by successive sawing. This process not only makes it possible to obtain a calibrated and very fine slit but also to produce a profile forming an obstacle.
  • the slots are no longer obtained solely by sawing but essentially by punching: first the metal strip is U-shaped, it is placed on a template 9 and the bottom of the U is punched by means of '' a knife 10, the end of which has a cutting edge 11 perpendicular to the axis of the strip and a wedge profile, one of the faces 12 of which is perpendicular to the punched surface and in that the punches are produced from distance to distance at intervals regular.
  • the punching is not through and only forms a deformation 13 whose profile has a wall 14 perpendicular to the surface 15 of the bottom of the U followed by an inclined wall 16, the slot 17 is obtained by a saw cut 18 to the right of the vertical wall.
  • the punching is through, it punctures the strip and cuts the slot, the width of which is determined by the depth of penetration of the knife 10.
  • the punching member can be a simple hammer with reciprocating motion or a knurled wheel, which makes it possible to achieve a high rate of perforation.
  • the punching is carried out on the outside face of the bottom of the U towards the inside 20.
  • the screening surface being determined by the outside face of the bottom of the U, this surface then has a plurality of hollows perforated: the screen is perforated hollow.
  • the punching is carried out on the inner face 21 of the bottom of the U outwards 22; the surface of the screen then presents a plurality of obstacles in relief: the screen is perforated in relief.
  • the punching giving an obstacle in relief is determined so that during the juxtaposition of two adjacent elements 2, 2 ′ mounted in a spiral the adjacent and opposite lateral ends 23, 24 of two adjacent obstacles 25, 26 are approximately aligned and form a groove 27. This forms a helical path which has the function of receiving and guiding the fraction of the rejected pulp towards the discharge outlet.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Combined Means For Separation Of Solids (AREA)
EP92400936A 1991-04-17 1992-04-03 Geschlitzte Siebtrommel zum Filtrieren von Faserbrei und Verfahren zu seiner Herstellung Ceased EP0509873A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9104693A FR2675519B1 (fr) 1991-04-17 1991-04-17 Tamis cylindrique a fentes pour epurateur de pate a papier et son procede de realisation.
FR9104693 1991-04-17

Publications (1)

Publication Number Publication Date
EP0509873A1 true EP0509873A1 (de) 1992-10-21

Family

ID=9411924

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92400936A Ceased EP0509873A1 (de) 1991-04-17 1992-04-03 Geschlitzte Siebtrommel zum Filtrieren von Faserbrei und Verfahren zu seiner Herstellung

Country Status (5)

Country Link
US (1) US5293677A (de)
EP (1) EP0509873A1 (de)
JP (1) JPH05171587A (de)
FI (1) FI921742A (de)
FR (1) FR2675519B1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19833441A1 (de) * 1998-07-24 2000-01-27 Voith Sulzer Papiertech Patent Verfahren zur Herstellung eines Schlitzsiebkorbes für faserstoffhaltige Suspensionen

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112792499A (zh) * 2019-11-13 2021-05-14 北京海蓝华轩科技有限公司 一种流线型缝割缝筛管复合加工方法及装备

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989012137A1 (en) * 1988-06-10 1989-12-14 Beloit Corporation Wave screen plate and manufacturing methods
EP0354846A1 (de) * 1988-08-12 1990-02-14 E & M LAMORT Sieb zur Reinigung und Klassifizierung von Papierstoffbrei

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61289915A (ja) * 1985-06-18 1986-12-19 Sumitomo Metal Ind Ltd ストレ−ナ管の製造方法
US5023986A (en) * 1988-06-10 1991-06-18 Beloit Corporation Method of manufacturing a wave screen plate

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1989012137A1 (en) * 1988-06-10 1989-12-14 Beloit Corporation Wave screen plate and manufacturing methods
EP0354846A1 (de) * 1988-08-12 1990-02-14 E & M LAMORT Sieb zur Reinigung und Klassifizierung von Papierstoffbrei

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19833441A1 (de) * 1998-07-24 2000-01-27 Voith Sulzer Papiertech Patent Verfahren zur Herstellung eines Schlitzsiebkorbes für faserstoffhaltige Suspensionen

Also Published As

Publication number Publication date
FR2675519B1 (fr) 1993-08-06
FR2675519A1 (fr) 1992-10-23
FI921742A (fi) 1992-10-18
JPH05171587A (ja) 1993-07-09
US5293677A (en) 1994-03-15
FI921742A0 (fi) 1992-04-16

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