US3698649A - Screening apparatus - Google Patents

Screening apparatus Download PDF

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Publication number
US3698649A
US3698649A US3698649DA US3698649A US 3698649 A US3698649 A US 3698649A US 3698649D A US3698649D A US 3698649DA US 3698649 A US3698649 A US 3698649A
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US
United States
Prior art keywords
chamber
inlet
outlet
intake
line
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
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English (en)
Inventor
William Herbert
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Black Clawson Co
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Black Clawson Co
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Publication date
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Publication of US3698649A publication Critical patent/US3698649A/en
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30—Defibrating by other means
    • D21B1/32—Defibrating by other means of waste paper
    • 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
    • D21D5/04—Flat 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/64—Paper recycling

Definitions

  • a slurry of the material to be treated is passed through an intake line into the intake section where it is subjected to mechanical and hydraulic shear forces by a pair of rotors, each of which is rotatably mounted in the intake section in closely spaced relationship to one of the foraminous walls. Accepted portions of the slurry pass through perforations in the foraminous walls into the outlet sections for removal through outlet lines while rejected material is bled from the intake chamber, either periodically or continuously, through a reject line.
  • a rinse line may also be utilized, feeding into the intake chamber, to assist in purging the system.
  • solid waste materials may be treated by depositing them in a waste treatment tub with an aqueous medium and subjecting them to mechanical and hydraulic shear forces through the rotation of a rotor having swinging flails or hammers mounted on some of its rotor arms. Relatively infrangible portions of the waste material are removed separately from the waste treatment tub while the remaining portions are degraded to a predetermined particulate size or smaller and removed in slurry form through perforations in the tub for further treatment.
  • the present invention provides screening and defibering apparatus which includes a chamber of substantially rectangular cross section divided by a pair of foraminous walls into an intake section and a pair of outwardly disposed outlet sections with a pair of opposed rotors rotatably mounted within the intake section in closely spaced relationship to the foraminous walls.
  • the material to be treated whether a slurry of papermaking fibers, pulped solid wastes or other material, is fed into the intake section and those portions which have been reduced sufficiently prior to introduction into the intake section pass through the foraminous walls'into the outlet sections.
  • the remaining material is subjected to violent hydraulic and mechanical shear forces generated in' the intake section which will defiber undefibered portions of the material, after which these portions may also pass through the perforations in the foraminous walls.
  • the rotors are so shaped that they exert a pulsating pressure on the foraminous walls, thereby preventingthe obstruction of the perforations through these walls.
  • Stringy, defiberable materials rather than blocking the perforation as in the case of vibrating screens or jamming the rotors as in the case of rotatingfoils, are reduced in size by the rotors and then pass through the perforations in the foraminous walls.
  • Non-defiberable materials such as plastics, rubber, leather, textiles and the like, are accumulated in the inlet chamber and rejected.
  • Apparatus according to the present invention is ideally suited for the screening and defibering of papermaking stock at a variety of points in the papermaking stock preparation system as well as in the treatment of slurries of pulped solid waste materials. In either case, apparatus according to the present invention is capable of handling slurries containing'high proportions of rejects and at relatively high consistencies and of screening and defibering such slurries with little danger of malfunction through blocking, jamming or the like.
  • FIG. 1 is a plan view of screening apparatus in accordance with the present invention. 7 I
  • FIG. 2 is an elevational view of the apparatus of FIG. I with portions broken away for clarity;
  • FIG. 3 is a view taken on line 3-3 of FIG. 2;
  • FIG. 4 is a somewhat diagrammatic view showing a typical installation of the screening apparatus of the present invention.
  • 3 FIG. 5 is a view wimilar to'FIG. 4 but showing a second installation in which the present invention may be used; and
  • FIG. 6 shows still a third installation of apparatus according to the present invention.
  • apparatus 10 in accordance with the present invention includes a substantially rectangularly cross sectioned chamber 12 which is subdivided into an intake section 14 and a pair of flanking outlet sections 16 by means of a pair of spaced, parallel, foraminous walls 18.
  • a drive shaft 20 extends completely through the chamber 12 and has its end portions journaled outwardly of the chamber, as at 22.
  • a pair of rotors 24 are fixed to the drive shaft 20 in opposed relationship to each other and in closely spaced relationship to the perforated central portion 25 of each of the foraminous walls 18.
  • Means such as the motor 26, sheaves 28 and 30, and the'interconnecting pulley belt 32, serveto impart rotational movement to the drive shaft 20 and the rotors 24 attached thereto, and in this regard it will be seen that by mounting the rotors in opposed relationship the thrust forces generated by rotation of the rotor are balanced.
  • Each of the rotors 24, as best seen in FIG. 3 of the drawings, is of the type shown in US. Pat. No. 3,073,535 and includes a central hub portion 34 and a plurality of outwardly projecting rotor arms 36, each of which has a substantially planar leading edge 37 and a curved trailing edge 38.
  • Deflecting bars 39 and 40 are also provided attached to opposed portions of the rotor 24 and perforated section 25, respectively, in angular relationship to each other.
  • An inlet 42 delivers the slurry to the intake section 14 of the chamber 12 while a reject line 44 may be provided for withdrawing rejected material which does not pass through the perforated sections of the foraminous walls 18.
  • FIG. 4 of the drawings one system in which the screening apparatus of the present invention finds utility is shown.
  • raw material such as waste paper which may contain such things as plastics and wet strength paper
  • Pulper 50 may include upstanding sidewalls 52 and a perforated bed plate 54,
  • Raw materialdeposited in the pulper is subjected to a defibering action by the rotor 56 so that a substantial portion thereof will pass from the pulper through the perforated bed plate 54 for further treatment, such as fine screening etc.
  • a purging device indicated diagrammatically at 58, which removes from the pulper materials such as plastics, wet strength papers, and other relatively undefiberable materials.
  • Such materials may then be pumped by means of a pump 60 to a liquid cyclone 62 for the removal of high specific gravity materials such as grit and the like.
  • the slurry of accepts from the liquid cyclone which will contain, as noted above, plastic and high wet strength papers and other fibrous materials, may then be delivered to the screening-defibering apparatus 10 of the present invention.
  • the deflecting bars 39 and 40 exert a scissors-like effect on any particles which might otherwise tend to lodge beneath the rotor, and
  • the rotors 24 impart a pumping or pulsating effect on the perforated walls 18 which not only serves tomaintain the perforations unobstructed but also provides some defibering action on such materials as wet strength papers.
  • Solid portions of the slurry of the proper size pass through the perforations in the walls 18 into the outlet sections 16 of the screening apparatus. From these sections the reduced and screened material is then continuously removed through the outlet lines 46 and recycled to the pulper 50 by means of a conduit 64 for futher treatment in the system.
  • the feed into the system and the withdrawal vof rejects therefrom may be accomplished either periodically or on an intermittent basis. If the feed and withdrawal of rejects are on a non-continuous basis, the rejects line 44 will ordinarily be maintained closedby a valve member 66 and a rinse line 68. is provided, normally maintained closed bymeans of valve member 70 as material is fed into the system. After some predetermined time, or when it has been determined that a certain amount of reject material has built up in theintake chamber, the feed line 42 may be closed by means of a valve 72 and the rinse line 68 and reject line 44 opened.
  • rejects from'a primary screen 80 may be passed to holding tank 82 and thence, by means of a pump 84 through the feed line 42 into the intake section 14 for treatment as above.
  • the accepts from the outlet sections 16 can of course be returned to the system with the accepts from the primary screen 80 while the rejects are then drained through line 44 and disposed of in a suitable manner.
  • solid waste materials which mayinclude such things as fibers, glass, ferrous and non-ferrous metals, plastics, food waste, and other organics and inorganics, may be dumped into a treatment vessel 90 having a rotor 92 of the type'described above mounted in the bottom thereof, where the frangible portions of the solid waste materials are reduced in the presence of water or the like to a size sufficient to be extracted through a perforated bed plate 94.
  • a pump 96 then delivers the slurry of reduced solid materials and water to a liquid cyclone 98 where a major portion of the inorganics, such as metal, glass, stone, ceramics, etc., are removed and the remaining material, containing a high percentage of fibrous material, delivered through the line 42 into the intake section 14 of the screening and defibering apparatus 10.
  • the flat leading edge of the rotors and the interreaction of the rotors and the surfaces of the intake section exert a mechanical reducing effect on the solid materials introduced into the intake section 14.
  • operation of the apparatus 10 may be on either an intermittent or continuous basis and a rinse line 68 may be provided for, purging the system.
  • the apparatus 10 may handle relatively high consistency slurries of materials containing relatively high percentages of rejects and containing traditionally bothersome materials such as stringy materials and still provide trouble free, efficient operation.
  • rotor means rotatably mounted in said intake section in closely spaced relationship to said foraminous wall means
  • c. means positioned outwardly of said chamber and journaling end portions of said drive shaft for rotation thereof.
  • each of said rotor means comprises:
  • each of said rotor arms having a substantially planar leading edge.
  • said intake section is substantially rectangular in cross section.
  • Screening apparatus comprising:
  • a pair of rotors each including a central hub and outwardly projecting arms have substantially planar leading edges mounted on said shaft within said inlet chamber and in overlying relationship to said foraminous walls,
  • a rinse line having a valve member therein communicating with said inlet line intermediate said inlet chamber and said inlet line valve
  • a reject line having a valve member therein communicating with said inlet chamber
  • a rinse line including control means therefor connected with said inlet means.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)
US3698649D 1970-12-18 1970-12-18 Screening apparatus Expired - Lifetime US3698649A (en)

Applications Claiming Priority (1)

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US9955370A 1970-12-18 1970-12-18

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FI (1) FI51843C (cs)
SE (1) SE381065B (cs)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3844488A (en) * 1971-08-12 1974-10-29 Voith Gmbh J M Apparatus for pulping and grading of waste paper
US3925150A (en) * 1973-04-06 1975-12-09 Black Clawson Co Selective reclamation of waste paper products
US3960332A (en) * 1974-10-23 1976-06-01 The Black Clawson Company Defibering apparatus for paper making stock
US3989197A (en) * 1971-08-12 1976-11-02 J. M. Voith Gmbh Apparatus for pulping and grading of waste paper
US3990643A (en) * 1971-08-12 1976-11-09 J. M. Voith Gmbh Method of pulping and grading waste paper
US4129259A (en) * 1977-09-15 1978-12-12 The Black Clawson Company Apparatus for pulping waste paper materials
FR2556751A1 (fr) * 1983-12-16 1985-06-21 Voith Gmbh Appareil pour le traitement de vieux papiers
US5527432A (en) * 1994-01-28 1996-06-18 Advanced Fiber Technology, Inc. Method of dry separating fibers from paper making waste sludge and fiber product thereof
US5775601A (en) * 1996-06-12 1998-07-07 Georgia Industrial Minerals, Inc. Systems and method for producing delaminated sedimentary mica

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3844488A (en) * 1971-08-12 1974-10-29 Voith Gmbh J M Apparatus for pulping and grading of waste paper
US3989197A (en) * 1971-08-12 1976-11-02 J. M. Voith Gmbh Apparatus for pulping and grading of waste paper
US3990643A (en) * 1971-08-12 1976-11-09 J. M. Voith Gmbh Method of pulping and grading waste paper
US3925150A (en) * 1973-04-06 1975-12-09 Black Clawson Co Selective reclamation of waste paper products
US3960332A (en) * 1974-10-23 1976-06-01 The Black Clawson Company Defibering apparatus for paper making stock
USRE30011E (en) * 1974-10-23 1979-05-29 The Black Clawson Company Defibering apparatus for paper making stock
US4129259A (en) * 1977-09-15 1978-12-12 The Black Clawson Company Apparatus for pulping waste paper materials
FR2556751A1 (fr) * 1983-12-16 1985-06-21 Voith Gmbh Appareil pour le traitement de vieux papiers
US5527432A (en) * 1994-01-28 1996-06-18 Advanced Fiber Technology, Inc. Method of dry separating fibers from paper making waste sludge and fiber product thereof
US5775601A (en) * 1996-06-12 1998-07-07 Georgia Industrial Minerals, Inc. Systems and method for producing delaminated sedimentary mica

Also Published As

Publication number Publication date
FI51843C (fi) 1977-04-12
FI51843B (cs) 1976-12-31
SE381065B (sv) 1975-11-24

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