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WO2006000625A1 - Appareil destine au traitement par criblage ou dispersion, notamment, de matieres particulaires, telles que des flocons et des copeaux - Google Patents

Appareil destine au traitement par criblage ou dispersion, notamment, de matieres particulaires, telles que des flocons et des copeaux Download PDF

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Publication number
WO2006000625A1
WO2006000625A1 PCT/FI2005/000295 FI2005000295W WO2006000625A1 WO 2006000625 A1 WO2006000625 A1 WO 2006000625A1 FI 2005000295 W FI2005000295 W FI 2005000295W WO 2006000625 A1 WO2006000625 A1 WO 2006000625A1
Authority
WO
WIPO (PCT)
Prior art keywords
rolls
roll
flakes
roll set
screen
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
PCT/FI2005/000295
Other languages
English (en)
Inventor
Seppo Saukkonen
Lauri Tuovinen
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.)
Metso Paper Valkeakoski Oy
Original Assignee
Metso Panelboard Oy
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 FI20040879A external-priority patent/FI116452B/fi
Application filed by Metso Panelboard Oy filed Critical Metso Panelboard Oy
Publication of WO2006000625A1 publication Critical patent/WO2006000625A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B07B1/22—Revolving drums
    • 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
    • B07B1/12—Apparatus having only parallel elements
    • B07B1/14—Roller screens

Definitions

  • the present invention relates to an apparatus for processing by way of, e.g., screening or scattering, particulate matter such as flakes or chips, the appa ⁇ ratus comprising at least one roll set formed by two or more parallel rotating screen rolls, onto which set of screen rolls the material to be processed is fed, the screen rolls of the set having a hollow core.
  • the appa ⁇ ratus comprising at least one roll set formed by two or more parallel rotating screen rolls, onto which set of screen rolls the material to be processed is fed, the screen rolls of the set having a hollow core.
  • Such particulate matter includes, e.g., different waste of saw mills, chipped peeling waste of veneer industry, as well as the relatively large Oriented Strand Board (OSB) and waferboard flakes, chiefly employed in the North-American wood particleboard industry.
  • OSB Oriented Strand Board
  • Fl Pat. No. 98,276 discloses an apparatus for length screening of elongated particles such as wood chips, the apparatus comprising at least two substan- tially horizontally mounted, mutually substantially parallel-oriented rolls.
  • the screening operation is carried out using a roll screen of parallel rolls, wherein the rolls are so-called cage bar rolls.
  • the cage bar rolls are comprised of a number of cage bars aligned parallel to the longitudinal axis of the roll and are substantially equidistantly spaced from each other along the periphery of the roll, the bar ends being attached to disc- or ring-type flanges aligned perpendicular to the longitudinal axis of the roll.
  • the flanges themselves are mounted on the rotary shaft of the roll.
  • the roll set comprises 8 to 12 parallel-mounted cage bar rolls.
  • the construction is characterized in that the number of longitudinally aligned cage bars in the intake-end rolls of the roll set is larger than in the exit-end rolls of the set.
  • the rotary rolls elevate elongated particles at the intake end of the roll set thus preventing them from falling excessively early through the interroll gaps of the roll set.
  • the roll set according to cited patent publication is not particularly suited for screening particles, especially those of the finest size, away from the bulk of particles. To this end, the interbar gaps of cage bar rolls are excessively large.
  • the apparatus according to the invention is charac ⁇ terized in that the outer periphery of the screen rolls is made mesh-like and that the speed of rotation of the screen rolls is adjusted such that the flow of flakes fed onto the rolls is thrown away from the roll surfaces in a fashion that causes the separation of the flakes from each other.
  • a preferred embodiment of the apparatus according to the invention is char ⁇ acterized in that, with the diameter of the rolls (1 ) being approx. 300 mm, the rolls are operated at a speed of rotation of 50-200 r/min, advantageously of 80-170 r/min.
  • Another preferred embodiment of the invention is characterized in that the number of roll sets is two in a substantially superimposed position, whereby the upper roll set is mounted into an upward-inclined position in the travel direction of the material flow, while the lower roll set is mounted into a downward-inclined position in the travel direction of the material flow.
  • a still another preferred embodiment of the invention is characterized in that the upward-ramping inclination angle of the upper roll set relative to the horizontal plane is 0.5° - 15°, most advantageously 5° - 10°, while the downward-ramping inclination angle of the lower roll set relative to the horizontal plane is 0.5° - 25°, most advantageously 5° - 15°.
  • the goal of the invention is attained by virtue of using large- diameter, highly frictional rolls (mesh-shell rolls) rotated at a high speed to throw the flakes into free air, whereby the thus separated large flakes are readily separated from fines resting thereon or adhering to the surface thereof.
  • the benefits of the invention include extremely precise screening with a screening throughput capacity greater than that of conventional screening apparatuses. Furthermore, screening takes place in a "gentle” fashion without causing disintegration of the particles.
  • FIG. 1 shows a preferred embodiment of apparatus according to the invention implemented using two superimposed roll sets
  • FIG. 2 shows a side elevation view of a mesh-shell roll used in the roll set of an apparatus according to the invention
  • FIG. 3 shows an axonometric view of a mesh-shell roll used in a roll set according to the invention.
  • FIG. 4 shows an end view of the roll illustrated in the other diagrams.
  • FIG. 1 there is shown an apparatus according to the invention incorporating an upper roll set A and a lower roll set B. Above either one of the roll sets is drawn an arrow indicating the flow travel direction of the mate ⁇ rial being treated.
  • the upper roll set A is inclined upward-ramping in regard to the flow travel direction of the flaked material fed thereon, while the lower roll set B is respectively inclined downward-ramping in regard to the flake mate ⁇ rial flow travel direction.
  • the inclination angle of the upper roll set relative to the horizontal plane is 0.5° - 15°, most advantageously 5° - 10°.
  • the inclination angle of the lower roll set relative to the horizontal plane is 0.5° - 25°, most advantageously 5° - 15°.
  • Both the upper and the lower roll sets are comprised of parallel-aligned, hollow, rotatable mesh-shell rolls 1 having a structure shown in greater detail in FIGS. 2-4.
  • the rolls of both set are arranged to rotate mutually in the same direction, whereby the rolls during screening also trans ⁇ port the material forward on the roll set toward the exit end of the screen.
  • the invention utilizes large-diameter mesh-shell rolls 1 rotated at a high speed that frictionally throw the flakes into free air thus aiding the separation of flakes from each other.
  • the flight path of the flakes to a given height above the rolls can be controlled by adjusting the rotational speed of the rolls. For rolls of, e.g., 300 mm diameter, a suitable speed of rotation is about 50- 200 r/min, advantageously 80-170 r/min.
  • the upper roll set A is inclined upward-ramping in the travel di ⁇ rection of the flakes, whereby the travel speed of flakes is retarded thereby enhancing the screening effect inasmuch as the flakes under the centrifugally flinging effect of the rolls 1 are thus thrown more upward and less forward.
  • the flakes are subjected to a longer period of screening, as a result of which action less fines are transported along with the large flakes over the roll set.
  • the fraction falling from the upper roll set A through its mesh-shell rolls 1 accumulates onto a conveyor 7 placed thereunder that transports this fraction further to the entry end of the lower roll set B (to the left side as indicated by the arrow drawn above the conveyor in the diagram) for a second screening.
  • the screening performed by the lower roll set B is advantageously set to admit as accurately as possible the passage of flakes of the accept size while simultaneously preventing the passage of all particles of larger size than accepts through the interroll nips 2.
  • an interroll gap of at least a millimeter or so must be left between the rolls and the thickness of the flakes of the same order, it is possible that a small por ⁇ tion of good-quality large flakes escape through the interroll gaps 2 with the provision that the inclination angle of the lower roll set is adjusted upward- ramping or horizontal.
  • the inclination angle of the lower roll set is adjusted upward- ramping or horizontal.
  • the ramping angle of the roll set is determined by the diameter of the rolls and the desired interroll gap.
  • a roll diameter of 300 mm in combination with a maximum interroll gap of 3 mm results in a theoretical minimum downward-ramping inclination angle of about 8° for the roll set. Having the roll set adjusted to this inclination prevents a downward-falling flake from "seeing" the interroll gap and, instead, forces the flake to land onto the next roll of the set.
  • FIGS. 2-4 show a feasible mesh-shell roll construction.
  • the roll comprises a shaft 4 having end flanges 5 mounted thereon and, when necessary, also intermediate supportive flanges (not shown) similar to the roll end flanges interspacedly mounted therebetween.
  • To the end flanges 5 and the optional intermediate supportive flanges is attached a mesh-like peripheral shell 3 of the roll.
  • the size of mesh openings is selected according to the maximum size of particles in the fraction to be removed from the particle flow. This kind of screen is particularly effective in the sorting of long flakes inasmuch as the penetration of long flakes through the mesh-like roll periphery is possible practically only in a perpendicular position, while smaller particles of less desired smaller size pass freely through the rolls.
  • this kind of wire-mesh screen rolls are known as being used in other applications.
  • a wire- mesh screen roll intended for use in the flow control of chip travel and scattering, particularly at the exit of the chip flow from a scattering chamber, prior to the screening and scattering of the chips into a particle mat to be pressed into a chipboard.
  • these mesh-shell rolls have not been used in the art as a set of screen rolls for sorting or scattering particles.
  • the ends of roll 1 are provided with openings 6, e.g., three openings at each end flange (and the internal supportive flanges).
  • the function of the openings is to facilitate the outflow of material fallen into the interior space of the roll away therefrom.
  • This discharging function is further enhanced by tilting the rolls such that one end of the roll is adapted to rotate at a lower level than the other end.
  • the rolls are mutually inclined in different directions laterally such that, e.g., every second of two adjacent rolls is mutually inclined in the same direction or that, e.g., every two adjacent rolls are mutually inclined in the same lateral direction and, respectively, the next two rolls in succession are inclined in a different lateral direction, and so on.
  • the rolls do not become plugged even if the openings of end flanges are omitted.
  • the reason behind this is therein that, in the arrangement according to the invention, the OSB flakes hit first the convex upper periphery of the mesh-sheil roll, whereby the flakes either are impacted by the meshed surface thereby being flung up- and forward on the roll set or, having a sufficiently short length and/or thin cross section, pass through the mesh openings into the interior space of the roll.
  • the particle In the interior of the roll, the particle is subjected to an equivalent action: the particle either is projected tangentially along the inner periphery of the roll shell or coincides with a mesh opening, whereby it is ejected out of the roll interior via the meshed roll shell.
  • the flake meets the concave inner periphery of the roll shell at a positive angle that varies in the range of about 0° - +40° thus favoring the egress of the flake out from the roll interior space.
  • Another difference in these two ingress/egress processes of the flake through the mesh shell is related to the direction of the inertial (centrifugal) force. Namely, at the possible ingress of the flake through the roll shell, there is no inertial force prior to the instant the flake touches the surface of the roll shell. The force thus imposed and the resultant motion of the flake is directed outwardly from the roll shell, whereby the probability of the flake ingress into the roll interior is diminished.
  • the number of mesh-shell rolls 1 in a set is 8 to 35, mounted in a plane.
  • the rolls are aligned substantially parallel to each other with minimal interroll gaps 2.
  • the size of mesh openings in the screen rolls is selected such that small reject particles below a given size pass through the mesh openings and thus fall onto an underlying conveyor 7 (adapted to operate under the upper roll set A) or, alternatively, onto some like apparatus performing further processing.
  • the other portion of the particle flow, called the accepts travels over the entire roll set and exits at the other end of the apparatus opposite to its entry end.
  • OSB flakes are long and wide, their thickness is generally substan ⁇ tially smaller than 1 mm. Hence, they tend to adhere to the surface of the rolls on which they are propelled forward and, with the provision that a sub- stantially large gap is offered between the rolls, the interroll gaps may allow the passage of a substantial portion of large flakes that in fact should be includeed in the reject portion of flakes intended to pass over the roll set.
  • the roll set comprised of mesh-shell screen rolls implemented in accordance with the invention can also be used for scattering of chips, e.g., in the manufac ⁇ ture of chipboard products. If size sorting of chips is necessary prior to scattering, the successive mesh-shell screen rolls can be provided with differently sized or shaped openings.
  • the rotational direction of the rolls of a roll set may be individually varied, whereby the rolls can be arranged to rotate in different directions as required. Obviously, also the speed of rotation of the rolls can be freely selected.
  • the number of rolls in a set can be varied as desired.
  • An essential feature herein is that the number of rolls in a set is at least two, advantageously, however, 8 to 35.
  • the diagrams illustrate the rolls mutually aligned substantially in the same plane. Nevertheless, the rolls can be arranged alternatively, e.g., by having some of the rolls mounted above the others or in some other fashion.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Crushing And Grinding (AREA)
  • Debarking, Splitting, And Disintegration Of Timber (AREA)

Abstract

L'invention concerne un appareil destiné au traitement, par criblage ou dispersion, notamment, de matières particulaires, telles que des flocons ou des copeaux. Cet appareil comprend au moins un ensemble de rouleaux composé d'au moins deux rouleaux de criblage (1) rotatifs, parallèles, sur lesquels les matières à traiter sont amenées, les rouleaux de criblage ayant un noyau creux. Pour atteindre l'objectif souhaité, le pourtour des rouleaux de criblage (1) est maillé et la vitesse de rotation des rouleaux est ajustée afin que de flocons arrivant sur les rouleaux soient projetés depuis la surface des rouleaux. Les flocons ainsi projetés sont séparés les uns des autres.
PCT/FI2005/000295 2004-06-24 2005-06-23 Appareil destine au traitement par criblage ou dispersion, notamment, de matieres particulaires, telles que des flocons et des copeaux Ceased WO2006000625A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FI20040879 2004-06-24
FI20040879A FI116452B (fi) 2004-06-24 2004-06-24 Laitteisto partikkeleiden, kuten lastun ja hakkeen, käsittelemiseksi, esimerkiksi seulomiseksi tai sirottelemiseksi
FI20050669 2005-06-21
FI20050669A FI20050669A7 (fi) 2004-06-24 2005-06-21 Laitteisto partikkeleiden, kuten lastun ja hakkeen, käsittelemiseksi, esim. seulomiseksi tai sirottelemiseksi

Publications (1)

Publication Number Publication Date
WO2006000625A1 true WO2006000625A1 (fr) 2006-01-05

Family

ID=34796752

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI2005/000295 Ceased WO2006000625A1 (fr) 2004-06-24 2005-06-23 Appareil destine au traitement par criblage ou dispersion, notamment, de matieres particulaires, telles que des flocons et des copeaux

Country Status (2)

Country Link
FI (1) FI20050669A7 (fr)
WO (1) WO2006000625A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014165930A1 (fr) * 2013-04-12 2014-10-16 Anaeco Limited Appareil et procédé de séparation des déchets solides
CN113974200A (zh) * 2021-12-13 2022-01-28 河南中烟工业有限责任公司 一种烟丝处理系统
CN115031517A (zh) * 2021-12-31 2022-09-09 安徽华塑股份有限公司 一种乙炔生产中电石渣低成本循环利用设备
CN116035246A (zh) * 2022-12-27 2023-05-02 云南研联机电有限公司 一种尺寸可调的片烟加工方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4658964A (en) * 1985-09-03 1987-04-21 Williams Patent Crusher And Pulverizer Company Rotary disc screen and method of operation
US4789068A (en) * 1986-05-14 1988-12-06 Gilmore Larry J Wood chip classifying system
EP0442222A1 (fr) * 1990-02-13 1991-08-21 James River Corporation Of Virginia Méthode et installation pour le triage de copeaux de bois

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4658964A (en) * 1985-09-03 1987-04-21 Williams Patent Crusher And Pulverizer Company Rotary disc screen and method of operation
US4789068A (en) * 1986-05-14 1988-12-06 Gilmore Larry J Wood chip classifying system
EP0442222A1 (fr) * 1990-02-13 1991-08-21 James River Corporation Of Virginia Méthode et installation pour le triage de copeaux de bois

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014165930A1 (fr) * 2013-04-12 2014-10-16 Anaeco Limited Appareil et procédé de séparation des déchets solides
CN113974200A (zh) * 2021-12-13 2022-01-28 河南中烟工业有限责任公司 一种烟丝处理系统
CN115031517A (zh) * 2021-12-31 2022-09-09 安徽华塑股份有限公司 一种乙炔生产中电石渣低成本循环利用设备
CN115031517B (zh) * 2021-12-31 2024-02-20 安徽华塑股份有限公司 一种乙炔生产中电石渣低成本循环利用设备
CN116035246A (zh) * 2022-12-27 2023-05-02 云南研联机电有限公司 一种尺寸可调的片烟加工方法

Also Published As

Publication number Publication date
FI20050669L (fi) 2005-12-25
FI20050669A7 (fi) 2005-12-25
FI20050669A0 (fi) 2005-06-21

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