US3909400A - Apparatus for fractionating fiber suspensions in accordance with fiber length - Google Patents

Apparatus for fractionating fiber suspensions in accordance with fiber length Download PDF

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Publication number
US3909400A
US3909400A US392263A US39226373A US3909400A US 3909400 A US3909400 A US 3909400A US 392263 A US392263 A US 392263A US 39226373 A US39226373 A US 39226373A US 3909400 A US3909400 A US 3909400A
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US
United States
Prior art keywords
slots
fibers
screen member
fiber length
chamber
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
US392263A
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English (en)
Inventor
Peter Seifert
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.)
Black Clawson Co
Original Assignee
Black Clawson Co
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 Black Clawson Co filed Critical Black Clawson Co
Priority to US392263A priority Critical patent/US3909400A/en
Priority to AR253650A priority patent/AR203105A1/es
Priority to CA201,025A priority patent/CA1003363A/en
Priority to BR5174/74A priority patent/BR7405174A/pt
Priority to SE7408549A priority patent/SE401939B/xx
Priority to FR7423852A priority patent/FR2245818B1/fr
Priority to JP7902974A priority patent/JPS5730197B2/ja
Priority to GB37257/74A priority patent/GB1480633A/en
Priority to DE2441059A priority patent/DE2441059A1/de
Priority to ES429600A priority patent/ES429600A1/es
Application granted granted Critical
Publication of US3909400A publication Critical patent/US3909400A/en
Assigned to WALTER E. HELLER & COMPANY, INC. reassignment WALTER E. HELLER & COMPANY, INC. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BLACK CLAWSON COMPANY, THE
Assigned to BLACK CLAWSON COMPANY, THE reassignment BLACK CLAWSON COMPANY, THE RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: HELLER FINANCIAL, INC. F/K/A/ WALTER E. HELLER & COMPANY INC.
Assigned to CHEMICAL BANK, AS AGENT reassignment CHEMICAL BANK, AS AGENT SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BLACK CLAWSON COMPANY, THE, HYDROTILE MACHINERY COMPANY
Assigned to BANK ONE, DAYTON, NATIONAL ASSOCIATION reassignment BANK ONE, DAYTON, NATIONAL ASSOCIATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). AMENDMENT TO AGREEMENT 6/01/88. SEE RECORD FOR DETAILS. Assignors: CHEMICAL BANK
Anticipated expiration legal-status Critical
Assigned to CENTRAL TRUST COMPANY, N.A., THE reassignment CENTRAL TRUST COMPANY, N.A., THE SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BC MANUFACTURING CO., INC., BLACK CLAWSON COMPANY, THE, BLACK CLAWSON CONVERTING LABORATORY, INC., BLACK CLAWSON CONVERTING MACHINERY CORP., RAYVILLE MANUFACTURING CO., INC
Assigned to HYDROTILE MACHINERY COMPANY (NOW KNOWN AS BC MANUFACTURING CO., INC.), BLACK CLAWSON COMPANY reassignment HYDROTILE MACHINERY COMPANY (NOW KNOWN AS BC MANUFACTURING CO., INC.) RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: BANK ONE, DAYTON, NATIONAL ASSOCIATION, CENTRAL TRUST COMPANY, N.A., DNC AMERICA BANKING CORPORATION
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G5/00—Separating, e.g. sorting, fibres
    • 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
    • D21D5/06—Rotary screen-drums

Definitions

  • ABSTRACT A slurry of mixed paper making fibers of a wide range of lengths is fractionated into two fractions wherein the fibers are predominantly of lengths greater or less, respectively, than a predetermined intermediate control length, by feeding 'the slurry under pressure into the inlet end of a cylindrical screen member having slotted perforations of predetermined size and spacing in accordance with the control fiber length for the slurry to be fractionated, ie.
  • This invention relates to the classification of mixtures of fibers of varied lengths, such particularly as papermaking fibers, into fractions in accordance with the lengths of the fibers composing each fraction, e. g. fractions wherein the fibers are predominantly of lengths greater or less than a predetermined intermediate length, respectively.
  • the invention is applicable to the fractionation of mixed pulp into a long fibered, high freeness pulp, and a short fibered, low freeness pulp.
  • the prior art has approached this objective as a screening operation, i.e. a process of separating long and short fibers in accordance with whether or not they pass through holes of particular size in a screen member.
  • a screening operation i.e. a process of separating long and short fibers in accordance with whether or not they pass through holes of particular size in a screen member.
  • the paper Groundwood Pulp Fractionation and Screening with Pressure Screens at High Consistency by A. J. Sternby and D. F. Lehman TAPPI 44, No. 6:401, June 1961
  • TAPPI 44, No. 6:401 described a series of tests of such a fractionating process in a screen constructed in accordance with Martindale U.S. Pat. No.
  • the present invention has as its primary objective the establishment of a new and different approach to the fractionation of mixed fibers into groups of predominantly long and short fibers respectively, and more particularly to establish principles of operation for fractionation which will enable accurate control of the intermediate fiber length at which the split occurs between the two fractions.
  • a more specific object of the invention is to establish new principles for effecting fiber fractionation which will make it possible to predetermine the fiber length at which a fiber mixture is split into two fractions, and to carry out fractionating operations with a maintained high degree of consistency of the distribution of fiber lengths in the resulting two fractions with respect to the desired division point.
  • fiber fractionation is performed by apparatus similar in structure and mode of operation to a pressure screen and incorporating a cylindrical screen member provided with multiple slots extending substantially axially thereof, but
  • the size of the slots is of less importance than their relative spacing and their radial dimension, and wherein the separating action is due primarily to operating conditions which cause long fibers to fold over of hair-pin on the lands between adjacent slots rather than to the inability of the long fibers to flow through the slots.
  • the stock to be fractionated will comprise fibers of a wide range of lengths such as will occur, for example, in groundwood pulp or waste corrugated board pulp, and the primary objective of treatment in accordance with the invention is to produce a fraction consisting predominantly of the long fibered constituent of the mixture.
  • Such pulp is introduced into one end of a cylindrical chamber having one wall, preferably the outer wall, defined by a cylindrical screen member having multiple axially extending slots therethrough, and the stock is caused to circulate in an approximately helical pattern so that it will travel from the inlet end of the chamber to its exit end.
  • apparatus of which the screen member forms a part will also include a primary outlet for stock which passes radially through the slots in the screen member, and a secondary outlet for continuously removing stock which has traversed the length of the chamber and been rejected by the screen member.
  • the stock to be fractionated is caused to circulate circumferentially of the screen member under such conditions of speed and hydraulic shear that the fibers, and particularly the longer fibers, tend to be oriented generally tangentially of the slotted cylindrical wall.
  • Oriented long fibers which are longer than the width of a slot therefore have a greater tendency to flow past the slots than through a slot, and even if the leading end of a long fiber enters a slot, its trailing portion will have a greater tendency to fold or hair-pin over the land on the off running side of the slot than to pass through the slot, due to the hydraulic forces urging the fiber circumferentially of the screen member.
  • pulsations are applied through the slots periodically which have the effect of dislodging hair-pinned fibers and causing them to return to the circulatory flow.
  • a relatively high volumetric rate of discharge flow is maintained from the exit chamber to minimize recirculation of long fibers into the screen chamber, and this flow will therefore contain the desired high proportion of long fibers and relatively low proportions of short fibers and other small particles.
  • the most important factor is the combination of slot spacing and screen cylinder thickness, because that governs the condition of hair-pinning of fibers. If, for example, both slot spacing and cylinder thickness are small, a substantial proportion of relatively short fibers can be expected to hairpin and thus be retained on the inlet side of the cylinder. For increased spacing and/or thickness, such fibers are more likely to pass through the slots while longer fibers will still have a greater tendency to hair-pin and to be retained on the long fiber side.
  • the invention therefore provides principles by which mechanical factors can be preselected to establish the division point between two fractions of a fiber mixture, relatively independently of other operating conditions.
  • the screen member 15 is provided with multiple screening slots 40 shown as extending generally parallel with its axis and the axis of rotor 30, i.e. so that they extend approximately at right angles to the somewhat helical path of the stock circulating therepast. These slots are shown as arranged in circumferential rows, with the individual slots being 2 inches in length and the rows spaced 1 inch apart axially of member 15, but neither of these dimensions nor the specific arrangement is critical, the important consideration being slot width, spacing and depth as described above.
  • fibers useful for papermaking purposes have lengths ranging from 0.5 to 6 mm, but the longer the fiber, the greater strength-it will impart to the paper.
  • Fiber fractionation is practiced for the purpose of obtaining one fraction which will be more valuable than the initial mixture because it contains predominantly long fibers and will therefore be of maximum strength properties and high qualities, while the other fraction will comprise predominantly short fibers and will therefore be of lower strength properties and lower quality. Since the value of the first fraction will also be enhanced by cleanliness, it is desirable to combine fractionation with cleaning, by concentrating as much contaminant material as possible in the short fiber fraction. These considerations in combination dictate the dimensions of the slots within the limits imposed by the desired control fiber length.
  • FIG. 2 represents an enlarged fragment of screen member comprising slots 40 alternating with lands 42.
  • long fibers 44 tend to be oriented generally tangentially of the slots 40, and therefore to travel past the slots rather than through them, notwithstanding the pressure differential which is maintained between the inlet and exit sides of the screen member. Fines and short fibers 45, as well as dirt particles 46 small enough to travel through the slots, will do so, by reason of this maintained pressure drop.
  • FIG. 2 also illustrates that when a long fiber 440 impinges on the screen member in such manner that its leading end enters the slot, its trailing portion will still tend to sweep past the slot so that the fiber hair-pins on the land 42 beyond the slot, as indicated at 44b.
  • This action will occur repeatedly as the operation proceeds, but clogging of the screen is prevented, and retention of the long fibers is assured, by the pulsations through the slots which are developed periodically by the traveling vanes 35, in the manner described in the Martindale patent.
  • the pressure wave which travels around the inlet side of the screen member with the leading edge of each vane will tend to cause small fibers and particles to travel through the slots but will merely cause hair-pinned fibers to remain in position.
  • fibers of the control length of 2.2 mm will tend to be allocated more or less evenly between the two fractions, the majority of the shorter fibers and other particles capable of passing through slots 40 will do so, but the great proportion of longer fibers will tend to remain on the inlet side of the screen member as part of the long fibered fraction discharged through outlet port 22.
  • secondary outlet means for continuously withdrawing slurry including such dislodged fibers from said other end of said screen chamber.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Paper (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
US392263A 1973-08-28 1973-08-28 Apparatus for fractionating fiber suspensions in accordance with fiber length Expired - Lifetime US3909400A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US392263A US3909400A (en) 1973-08-28 1973-08-28 Apparatus for fractionating fiber suspensions in accordance with fiber length
AR253650A AR203105A1 (es) 1973-08-28 1974-05-08 Un aparato para clasificar una pasta de fibras para elaborar papel
CA201,025A CA1003363A (en) 1973-08-28 1974-05-28 Cylindrical pulp screen with slot depths and land widths less than a variable length
BR5174/74A BR7405174A (pt) 1973-08-28 1974-06-25 Aparelho e processo para classificar uma pasta semifluida de fibras de fabricacao de papel
SE7408549A SE401939B (sv) 1973-08-28 1974-06-28 Silapparat for fraktionerande silning av en suspension av pappersmassa eller dylika fiber med avseende pa fiberlengden
FR7423852A FR2245818B1 (fr) 1973-08-28 1974-07-09
JP7902974A JPS5730197B2 (fr) 1973-08-28 1974-07-10
GB37257/74A GB1480633A (en) 1973-08-28 1974-08-23 Apparatus and method for classifying slurries of paper-making fibres into fractions of different fibre lengths
DE2441059A DE2441059A1 (de) 1973-08-28 1974-08-27 Verfahren und vorrichtung zur fraktionierung von fasersuspensionen gemaess der faserlaenge
ES429600A ES429600A1 (es) 1973-08-28 1974-08-28 Perfeccionamientos en aparatos para clasificar una pasta defibras para elaborar papel.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US392263A US3909400A (en) 1973-08-28 1973-08-28 Apparatus for fractionating fiber suspensions in accordance with fiber length

Publications (1)

Publication Number Publication Date
US3909400A true US3909400A (en) 1975-09-30

Family

ID=23549928

Family Applications (1)

Application Number Title Priority Date Filing Date
US392263A Expired - Lifetime US3909400A (en) 1973-08-28 1973-08-28 Apparatus for fractionating fiber suspensions in accordance with fiber length

Country Status (10)

Country Link
US (1) US3909400A (fr)
JP (1) JPS5730197B2 (fr)
AR (1) AR203105A1 (fr)
BR (1) BR7405174A (fr)
CA (1) CA1003363A (fr)
DE (1) DE2441059A1 (fr)
ES (1) ES429600A1 (fr)
FR (1) FR2245818B1 (fr)
GB (1) GB1480633A (fr)
SE (1) SE401939B (fr)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4383918A (en) * 1980-05-02 1983-05-17 The Black Clawson Company High turbulence screen
US4529520A (en) * 1983-01-26 1985-07-16 A. Ahlstrom Osakeyhtio Screen plate
US4876008A (en) * 1988-10-06 1989-10-24 Panel International Ltd. P.L.C. Sieve plate
US5133832A (en) * 1991-07-08 1992-07-28 The Black Clawson Company Process and system for preparation of waste paper stock with short and long fiber fractionation
WO1997012093A1 (fr) * 1995-09-25 1997-04-03 Heinrich Fiedler Gmbh & Co. Kg Dispositif de triage
US5624558A (en) * 1994-08-04 1997-04-29 Cae Screenplates Inc. Method and apparatus for screening a fiber suspension
US6029821A (en) * 1995-09-25 2000-02-29 Heinrich Fiedler Gmbh & Co. Kg Screening device
FR2934868A1 (fr) * 2008-08-11 2010-02-12 Marc Perrin Dispositif et procede de separation de fibres contenues dans un liquide, en particulier des fibres cellulosiques

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2750499C3 (de) * 1977-11-11 1982-02-04 Hermann Finckh, Maschinenfabrik GmbH & Co, 7417 Pfullingen Sortierer für Fasersuspension
SE8701423L (sv) * 1987-04-06 1988-10-07 Kamyr Ab Foerfarande vid framstaellning av fiberhaltig massa med olika raamaterial
CN110918458B (zh) * 2019-12-05 2021-01-29 东营海瑞宝新材料有限公司 一种防腐涂料的生产制备方法

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1037597A (en) * 1911-11-09 1912-09-03 Benjamin Denver Coppage Screening-machine for paper-pulp.
US2975899A (en) * 1957-04-16 1961-03-21 Bird Machine Co Screening device
US3276584A (en) * 1963-10-01 1966-10-04 Wilfred F Mathewson Pulp screen
US3349911A (en) * 1965-12-17 1967-10-31 Clayton Anderson & Co Fractionating apparatus
US3404065A (en) * 1966-12-01 1968-10-01 Karlstad Mekaniska Ab Apparatus for cleaning and fractionating a pulp suspension
US3420373A (en) * 1966-04-01 1969-01-07 Allen Bruce Hunter Pulp screens
US3446354A (en) * 1966-12-19 1969-05-27 Celleco Ab Method for fractionating a suspension of solid particles
US3680696A (en) * 1970-03-23 1972-08-01 Bird Machine Co Screening
US3713541A (en) * 1971-05-10 1973-01-30 Bird Machine Co Screening machine with slotted screen
US3726401A (en) * 1970-12-16 1973-04-10 Bird Machine Co Screening machine

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1037597A (en) * 1911-11-09 1912-09-03 Benjamin Denver Coppage Screening-machine for paper-pulp.
US2975899A (en) * 1957-04-16 1961-03-21 Bird Machine Co Screening device
US3276584A (en) * 1963-10-01 1966-10-04 Wilfred F Mathewson Pulp screen
US3349911A (en) * 1965-12-17 1967-10-31 Clayton Anderson & Co Fractionating apparatus
US3420373A (en) * 1966-04-01 1969-01-07 Allen Bruce Hunter Pulp screens
US3404065A (en) * 1966-12-01 1968-10-01 Karlstad Mekaniska Ab Apparatus for cleaning and fractionating a pulp suspension
US3446354A (en) * 1966-12-19 1969-05-27 Celleco Ab Method for fractionating a suspension of solid particles
US3680696A (en) * 1970-03-23 1972-08-01 Bird Machine Co Screening
US3726401A (en) * 1970-12-16 1973-04-10 Bird Machine Co Screening machine
US3713541A (en) * 1971-05-10 1973-01-30 Bird Machine Co Screening machine with slotted screen

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4383918A (en) * 1980-05-02 1983-05-17 The Black Clawson Company High turbulence screen
US4529520A (en) * 1983-01-26 1985-07-16 A. Ahlstrom Osakeyhtio Screen plate
US4876008A (en) * 1988-10-06 1989-10-24 Panel International Ltd. P.L.C. Sieve plate
US5133832A (en) * 1991-07-08 1992-07-28 The Black Clawson Company Process and system for preparation of waste paper stock with short and long fiber fractionation
US5624558A (en) * 1994-08-04 1997-04-29 Cae Screenplates Inc. Method and apparatus for screening a fiber suspension
WO1997012093A1 (fr) * 1995-09-25 1997-04-03 Heinrich Fiedler Gmbh & Co. Kg Dispositif de triage
US6029821A (en) * 1995-09-25 2000-02-29 Heinrich Fiedler Gmbh & Co. Kg Screening device
FR2934868A1 (fr) * 2008-08-11 2010-02-12 Marc Perrin Dispositif et procede de separation de fibres contenues dans un liquide, en particulier des fibres cellulosiques

Also Published As

Publication number Publication date
ES429600A1 (es) 1976-09-01
JPS5043203A (fr) 1975-04-18
JPS5730197B2 (fr) 1982-06-26
CA1003363A (en) 1977-01-11
DE2441059A1 (de) 1975-03-13
FR2245818A1 (fr) 1975-04-25
BR7405174A (pt) 1976-02-24
SE401939B (sv) 1978-06-05
FR2245818B1 (fr) 1979-08-03
GB1480633A (en) 1977-07-20
AR203105A1 (es) 1975-08-14
SE7408549L (fr) 1975-03-03

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AS Assignment

Owner name: WALTER E. HELLER & COMPANY, INC., 101 PARK AVE., N

Free format text: SECURITY INTEREST;ASSIGNOR:BLACK CLAWSON COMPANY, THE;REEL/FRAME:004250/0792

Effective date: 19840130

AS Assignment

Owner name: BLACK CLAWSON COMPANY THE

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:HELLER FINANCIAL, INC. F/K/A/ WALTER E. HELLER & COMPANY INC.;REEL/FRAME:004628/0875

Effective date: 19861015

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Owner name: CHEMICAL BANK, AS AGENT

Free format text: SECURITY INTEREST;ASSIGNORS:BLACK CLAWSON COMPANY, THE, AN OH CORP.;HYDROTILE MACHINERY COMPANY, ANIOWA CORPORATION;REEL/FRAME:004930/0102

Effective date: 19880601

AS Assignment

Owner name: BANK ONE, DAYTON, NATIONAL ASSOCIATION

Free format text: SECURITY INTEREST;ASSIGNOR:CHEMICAL BANK;REEL/FRAME:005319/0279

Effective date: 19900208

AS Assignment

Owner name: BLACK CLAWSON COMPANY, NEW YORK

Free format text: RELEASED BY SECURED PARTY;ASSIGNORS:BANK ONE, DAYTON, NATIONAL ASSOCIATION;CENTRAL TRUST COMPANY, N.A.;DNC AMERICA BANKING CORPORATION;REEL/FRAME:006414/0133

Effective date: 19921116

Owner name: CENTRAL TRUST COMPANY, N.A., THE, OHIO

Free format text: SECURITY INTEREST;ASSIGNORS:BLACK CLAWSON COMPANY, THE;BLACK CLAWSON CONVERTING LABORATORY, INC.;BLACK CLAWSON CONVERTING MACHINERY CORP.;AND OTHERS;REEL/FRAME:006385/0847

Effective date: 19921116

Owner name: HYDROTILE MACHINERY COMPANY (NOW KNOWN AS BC MANUF

Free format text: RELEASED BY SECURED PARTY;ASSIGNORS:BANK ONE, DAYTON, NATIONAL ASSOCIATION;CENTRAL TRUST COMPANY, N.A.;DNC AMERICA BANKING CORPORATION;REEL/FRAME:006414/0133

Effective date: 19921116