EP0354846B1 - 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
EP0354846B1
EP0354846B1 EP89402248A EP89402248A EP0354846B1 EP 0354846 B1 EP0354846 B1 EP 0354846B1 EP 89402248 A EP89402248 A EP 89402248A EP 89402248 A EP89402248 A EP 89402248A EP 0354846 B1 EP0354846 B1 EP 0354846B1
Authority
EP
European Patent Office
Prior art keywords
screen according
components
screen
slots
section
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.)
Expired - Lifetime
Application number
EP89402248A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0354846A1 (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
Priority claimed from FR8810863A external-priority patent/FR2635344A1/fr
Priority claimed from FR8903379A external-priority patent/FR2644487B1/fr
Application filed by E&M Lamort Fils SA filed Critical E&M Lamort Fils SA
Publication of EP0354846A1 publication Critical patent/EP0354846A1/fr
Application granted granted Critical
Publication of EP0354846B1 publication Critical patent/EP0354846B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • Y10T29/49604—Filter

Definitions

  • the slots and the holes must, for reasons of pressure drop and fouling be very short, that is to say of the order of 0 de, 5 to 1mm; on the other hand the sheets used in the current techniques are much thicker, of the order of 8 to 10 ⁇ mm, for reasons of resistance and as the performances required by the users are increasing, the thicknesses of the sheets increase. It follows that it is necessary to machine a clearance in the thickness of the sheet and then clean and polish this clearance, these two operations representing the most important work that is carried out on the sheets.
  • the object of the present invention is to make it possible to produce very efficient sieves with relatively thin stainless steel sheets, of the order of 2 millimeters.
  • the technique, object of the present invention which makes it possible to use such thin sheets while obtaining the necessary resistance, makes it possible to eliminate the essential clearances on thick sheets and greatly reduces the work of machining, cleaning and polishing . In addition, the consumption of raw material is lower.
  • the present invention relates to a sieve for purification or hydrodynamic classification of paper pulp in a purifier or a classifier with a blade characterized by the juxtaposition of U-section elements comprising a flat bottom provided with perforations and two side walls, the elements U-shaped section being arranged such that they form a wall of revolution, in particular cylindrical, provided with slots or holes associated or not with grooves and obstacles.
  • the elements are arranged either parallel or perpendicular to the generatrices of the cylinder, or by forming with the direction of the generator of the cylinder an angle between 0 de and 90 ⁇ °.
  • the screen comprises at least one element with a U-shaped cross section.
  • the screen comprises a plurality of inclined elements arranged in a spiral.
  • the screen When the inclination ⁇ decreases, the screen may be formed with only one element wound in a spiral, the turns being contiguous.
  • the elements with a U-shaped cross section can be produced by pleating the sheet or else can be formed by U-shaped profiles which are placed side by side and held by any means.
  • the screen comprises between two adjacent walls of two successive elements a flat element.
  • the sieve can be produced by using U-shaped profiles whose wings are of unequal lengths but whose ends of said wings are in the same plane which is perpendicular to them so that the bottom of the U where the holes or slots are drilled is inclined; so that the perforated surface is inclined relative to the cylindrical surface of the screen.
  • the asymmetrical U can be obtained by pleating a sheet or juxtaposition of separate elements as for symmetrical U.
  • a screen is produced from a sheet of thin thickness, between 1.5 and 2.5 mm, by juxtaposing elements 1, the cross section of which affects the shape of a U.
  • the screen consists of sections 1 in U, which are placed side by side.
  • Each element 1 has a bottom 2 and two side walls 3; the elements 1 are joined to each other by their side walls 3, the bottoms 2 forming the cylindrical surface of the screen in which the holes, slots and / or grooves will be formed.
  • FIGS. 3 and 4 it can be seen that the elements are produced by providing folds on a sheet metal plate, so as to also obtain side walls 3 and a bottom 2.
  • the grooves 5 are therefore made in the bottoms 2, from the outer side opposite the ends of the side walls, perpendicular to their longitudinal axis but to a depth less than the thickness of said bottom 2, then a slot 6 is made in the bottom of the groove 5 to a depth greater than that of the thickness of the bottom 2 so as to pass through it.
  • a cutter is used consisting of two contiguous discs (FIG. 11), one 5a to make the groove 5 and the other 6a, of larger diameter to make the slot 6. A slot is thus obtained in a single operation 6 that is very exactly positioned relative to the groove, which is very important.
  • the U-shaped elements are made in such a way that at the bottom of the junction of two vertical walls 3 there is always a space 8 such that each groove 5 and slot 6 open out freely by their two ends in two empty spaces 8.
  • the U-shaped elements can be straight and parallel to the generatrices of the cylinder as shown in FIG. 5 or else circular and perpendicular to these generatrices as shown in FIG. 6.
  • a cylinder screen is produced by a spiral winding of one or more U-shaped elements previously machined, that is to say comprising the perforations 6 (slots or holes) and possibly the grooves 5 previously described.
  • the sieve can be produced with a single element 1 of great length, produced either in one piece, or by butt welding a plurality of identical elements (FIG. 7a).
  • the winding is carried out by fixing one of the ends of the element on a mandrel whose rotation makes the bending and the spiral winding.
  • the turns have an inclination ⁇ relative to the plane perpendicular to the axis of the cylinder, slight by a few degrees.
  • the embodiment illustrates a cylindrical screen, but the invention is not limited to this conformation and extends to all forms of revolution, conical, cylindroconical, etc.
  • the grooves and / or the slots can be made not perpendicular to the longitudinal axis of the element, or to the side walls, but in a direction inclined by an angle ⁇ by relative to the perpendicular to the axis, this angle ⁇ being equal to the inclination of the turns of the sieve with respect to the plane 22 perpendicular to the longitudinal axis 23 of the sieve (fig. 8).
  • This prior inclination ⁇ of the slots makes it possible to obtain slots parallel to the axis of revolution of the screen.
  • the assembly of the juxtaposed elements can be carried out according to several variants independently of the embodiment of the screen (rectilinear elements, figure 5, annular figure 6, or spiral figure 7).
  • the assembly is carried out by the installation of a profile 16, or jumper, also in the general transverse shape of an inverted U, which comes to cap and pinch two adjacent wings.
  • the rider is continuous and, according to the embodiment, it is either rectilinear and maintains two adjacent walls over the entire length of the cylinder or between two crowns 10 ⁇ , or annular in the case of circular elements (Figure 6), or wound in spiral between two contiguous turns 13,14, all along the spiral
  • FIG. 18 A third alternative embodiment is shown in Figure 18.
  • the profiles are made with a thin strip, of the order of 0 ⁇ , 5 to 1 millimeter, the transverse dimensions of the profile being of the order of centimeter, for example with wings of 10 ⁇ millimeters and a base of 20 ⁇ millimeters; however, a sieve made with such a strip has a fairly great fragility.
  • To stiffen it provision is made to insert between two adjacent wings a flat metal element 17. This flat element is bent on edge and held contiguously between the walls 3 by electrical welding, preferably by continuous welding.
  • This flat element 17 is approximately the same thickness as the strip, and its width is at least equal to the height of the wings. Preferably the flat element exceeds the wings by two or three times their height.
  • This variant has an important advantage: with U-shaped elements of small dimensions and small thickness, it is possible to make very small perforations (slots or holes). Slits of width ranging from one millimeter to ten microns can be obtained.
  • the screen according to the invention has great technical and economic advantages.
  • the use of thin metal sheet allows both reduced machining, therefore reduced metal loss, but also to achieve very fine perforations with precision and using traditional tools.
  • Economically, such sieves are less costly in material, but above all much faster to produce; their construction cost is therefore significantly reduced.
  • Figures 19 to 24 relate to another alternative embodiment according to which the U-section profiles are no longer symmetrical as was the case in the previous figures but asymmetrical.
  • asymmetrical U-shaped profiles is meant that the bottom 2 of the U, on which the perforations are made (holes or slits) and possibly the grooves associated therewith to produce obstacles, is inclined obliquely to the wings (instead of 'be perpendicular thereto) and that said wings 3a and 3b have unequal lengths so that their ends are in the same plane which is perpendicular to them. It is thus obtained that the bottom surface 2 of said profiles in which the perforations are made (holes or slots) and possibly the grooves 5 are inclined relative to the cylindrical surface of the screen.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Filtration Of Liquid (AREA)
EP89402248A 1988-08-12 1989-08-09 Tamis pour épurateur et classificateur de pâte à papier Expired - Lifetime EP0354846B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR8810863A FR2635344A1 (fr) 1988-08-12 1988-08-12 Perfectionnements aux tamis pour epurateurs et classificateurs de pate a papier et procedes de realisation de tels tamis
FR8810863 1988-08-12
FR8903379 1989-03-15
FR8903379A FR2644487B1 (fr) 1989-03-15 1989-03-15 Tamis pour epurateur et classificateur de pate a papier et leur mode de realisation

Publications (2)

Publication Number Publication Date
EP0354846A1 EP0354846A1 (fr) 1990-02-14
EP0354846B1 true EP0354846B1 (fr) 1992-10-21

Family

ID=26226842

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89402248A Expired - Lifetime EP0354846B1 (fr) 1988-08-12 1989-08-09 Tamis pour épurateur et classificateur de pâte à papier

Country Status (7)

Country Link
US (1) US5128028A (ja)
EP (1) EP0354846B1 (ja)
JP (1) JP2837697B2 (ja)
CA (1) CA1338285C (ja)
DE (1) DE68903255T2 (ja)
ES (1) ES2035609T3 (ja)
FI (1) FI97243C (ja)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4954249A (en) * 1988-06-10 1990-09-04 Beloit Corporation Wave screen plate
FR2661196B1 (fr) * 1990-04-18 1992-07-17 Lamort Em Tamis pour epurateur et classificateur de pate a papier.
FR2675519B1 (fr) * 1991-04-17 1993-08-06 Lamort Em Tamis cylindrique a fentes pour epurateur de pate a papier et son procede de realisation.
FR2676076B1 (fr) * 1991-05-03 1993-08-06 Lamort E & M Couronne d'extremite de tamis cylindrique pour epurateur et classificateur de pate a papier et son procede de realisation.
US5462678A (en) * 1993-01-06 1995-10-31 Rosedale Products, Inc. Air blast backwash assembly for flexible filter device
US5460416A (en) * 1993-08-02 1995-10-24 Ameron, Inc. Perforated fiber reinforced pipe and couplings for articulating movement
CA2111147A1 (en) * 1993-12-13 1995-06-14 Jacques Riendeau Method of manufacturing a screen cylinder and a screen cylinder produced by the method
US5513757A (en) * 1994-06-02 1996-05-07 Sulzer Papertec Mansfield Inc. Continuous cut slotted screen basket
FR2725737B1 (fr) 1994-10-14 1997-01-31 Lamort E & M Perfectionnements aux tamis d'epuration, notamment pour la pate a papier
FI100010B (fi) * 1995-11-28 1997-08-15 Ahlstrom Machinery Oy Seulasylinteri
US5985146A (en) * 1997-07-23 1999-11-16 Trisep Corporation Sanitary rigid shell spiral wound element
WO2000038849A1 (en) * 1998-12-23 2000-07-06 Thermo Black Clawson Inc. Papermaker's screen cylinder with helix screen element
US7390419B2 (en) * 2005-02-17 2008-06-24 Con-Serv Manufacturing Waste water recovery system
JP4879556B2 (ja) * 2005-10-28 2012-02-22 独立行政法人理化学研究所 高電圧充電器
US20070193175A1 (en) * 2006-02-21 2007-08-23 Ta-Chung Hao Structure of decoration acoustic board
EP1870994B1 (en) * 2006-06-23 2010-01-20 ALSTOM Technology Ltd Power supply for electrostatic precipitator
CN101676048B (zh) * 2008-09-19 2011-11-09 赵仁理 圆筒形自动铆接装置
FR3033875B1 (fr) * 2015-03-17 2021-06-18 Andritz Perfojet Sas Tambour metallique, notamment pour un secheur
CN108166163A (zh) * 2018-03-08 2018-06-15 恒天重工股份有限公司 一种适用于水刺机抽吸辊筒的高透气立体托持圆网

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE248122C (ja) *
DE609741C (de) * 1935-02-22 Louis Herrmann Fa Siebboden
DE110081C (ja) *
US1800642A (en) * 1927-11-25 1931-04-14 Edward E Johnson Method of making well screens
US1930128A (en) * 1930-10-06 1933-10-10 Dorr Co Inc Rigid filter medium
US2015139A (en) * 1934-05-03 1935-09-24 William A Hardy & Sons Co Screen plate for paper making machines
GB519680A (en) * 1938-09-22 1940-04-03 James Walker Improvements in or relating to strainer plates and drums
US2423442A (en) * 1945-02-28 1947-07-08 Nat Lead Co Drum screen
US2519162A (en) * 1948-03-15 1950-08-15 Thomas T Tucker Acoustic testing structure including sound absorbing panels
FR1178881A (fr) * 1956-07-13 1959-05-15 Massey Harris Ferguson Great B Tamis à secousses notamment pour moissonneuse-batteuse
US3101526A (en) * 1960-02-12 1963-08-27 Edward E Johnson Inc Process for fabricating screens
FR1539846A (fr) * 1967-08-02 1968-09-20 E Et M Lamort Fils Ets Perfectionnement aux épurateurs notamment pour les pâtes à papier
JPS49121269A (ja) * 1973-03-27 1974-11-20
JPS5227420U (ja) * 1975-08-18 1977-02-25
US4155841A (en) * 1977-03-22 1979-05-22 The Black Clawson Company High turbulence screen
ZA774472B (en) * 1977-07-25 1979-06-27 Herrmann Screens Mfg Co Ltd Improvements in or relating to screening apparatus
DE3010059A1 (de) * 1980-03-15 1981-09-24 Robert Bosch Gmbh, 7000 Stuttgart Einrichtung zum begrenzen temperaturbedingter frequenzschwankungen eines quarzgesteuerter hochfrequenzoszillators
JPS57176288A (en) * 1980-08-25 1982-10-29 Black Clawson Co Screen apparatus for papermaking stock material
US4406326A (en) * 1981-12-17 1983-09-27 Uop Inc. Plastic well screen and method of forming same
FI67588C (fi) * 1983-01-26 1985-04-10 Ahlstroem Oy Silplaot
FR2572950B1 (fr) * 1984-11-12 1987-01-23 Lamort E & M Perfectionnements aux tamis pour epurateurs et a leur mode de fabrication
JPS61289915A (ja) * 1985-06-18 1986-12-19 Sumitomo Metal Ind Ltd ストレ−ナ管の製造方法
GB2195911A (en) * 1986-10-08 1988-04-20 Ingersoll Rand Co Screening apparatus for pulp

Also Published As

Publication number Publication date
FI893811A (fi) 1990-02-13
EP0354846A1 (fr) 1990-02-14
US5128028A (en) 1992-07-07
DE68903255D1 (de) 1992-11-26
CA1338285C (fr) 1996-04-30
JP2837697B2 (ja) 1998-12-16
JPH02139487A (ja) 1990-05-29
DE68903255T2 (de) 1993-05-19
FI97243C (fi) 1996-11-11
FI893811A0 (fi) 1989-08-11
FI97243B (fi) 1996-07-31
ES2035609T3 (es) 1993-04-16

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