EP2754749A1 - Papermaking screen apparatus - Google Patents

Papermaking screen apparatus Download PDF

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Publication number
EP2754749A1
EP2754749A1 EP14150389.6A EP14150389A EP2754749A1 EP 2754749 A1 EP2754749 A1 EP 2754749A1 EP 14150389 A EP14150389 A EP 14150389A EP 2754749 A1 EP2754749 A1 EP 2754749A1
Authority
EP
European Patent Office
Prior art keywords
stirring member
raw material
rotor body
single stirring
papermaking raw
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.)
Withdrawn
Application number
EP14150389.6A
Other languages
German (de)
English (en)
French (fr)
Inventor
Masaki Aikawa
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.)
Aikawa Iron Works Co Ltd
Original Assignee
Aikawa Iron Works Co Ltd
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 Aikawa Iron Works Co Ltd filed Critical Aikawa Iron Works Co Ltd
Publication of EP2754749A1 publication Critical patent/EP2754749A1/en
Withdrawn legal-status Critical Current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
    • 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
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils

Definitions

  • the present invention relates to a papermaking screen apparatus, in particular, to a papermaking screen apparatus that is capable of achieving energy saving and careful selection effect in a well-balanced manner.
  • a papermaking screen apparatus in which a linear stirring member having a falling gradient with respect to the papermaking raw material flow is provided on a side surface except for both end surfaces of a cylindrical papermaking rotor, a compression is generated at the front of the stirring member and a negative pressure is generated at the rear of the stirring member with respect to the flow of the papermaking raw material, and the washing action of a screen is caused, thereby making an effective selection (see JP 2008-223151 A ).
  • the stirring member inclines, and the papermaking raw material flow has a form that parries the resistance in accordance with the inclination of the stirring member, the apparatus is improved in terms of the power.
  • the stirring member of the latter papermaking screen apparatus is formed at a falling gradient with respect to the flow of the papermaking raw material, that is, linearly in an oblique direction
  • the papermaking raw material which collides with the stirring member is linearly guided in the oblique direction. Accordingly, the flow to the downstream side becomes stronger, and the papermaking raw material that does not pass through the screen is forcibly sent to a reject side.
  • the flow rate of the reject side is limited by a flow rate control valve, a phenomenon in which the raw material flow returns to the upstream side occurs. For that reason, since the foreign materials which cannot pass through the screen also return to the upstream side again and pass through the screen, there has been a problem in that the careful selection force is not sufficient.
  • the invention has been made in consideration of the above problems, and an object thereof is to provide a papermaking screen apparatus that is capable of achieving the energy saving and the careful selection effect in a well-balanced manner.
  • a papermaking screen apparatus includes a tank configured to accept a papermaking raw material, a screen configured to partition the tank into a primary chamber and a secondary chamber, a papermaking raw material supply passage that communicates with the primary chamber of the tank, and supplies the papermaking raw material to the tank, a foreign material discharge passage that communicates with the primary chamber, and discharges the papermaking raw material containing a foreign material that does not pass through the screen to the outside of the tank, a papermaking raw material discharge passage that communicates with the secondary chamber, and discharges the papermaking raw material that passed through the screen to the outside of the tank, a cylindrical rotor body that is rotatably provided in the primary chamber as the inside of the screen, and stirs the papermaking raw material in the primary chamber, and a stepped stirring member provided on the side surface except for both end surfaces of the rotor body, wherein the stepped stirring member is formed at a falling gradient, i.e. extending downwardly and backwardly, with respect to the papermaking raw
  • the stepped stirring member includes a plurality of single stirring members
  • the single stirring member is a substantially crescent-shaped member in which a width of an intermediate portion is wider than both ends in the longitudinal direction, the longitudinal direction of the single stirring member is substantially parallel to both end surfaces of the cylindrical rotor body
  • the plurality of the single stirring members is adjacently formed stepwise, and the adjacent single stirring members are provided so that a leading end portion of an upstream single stirring member with respect to the papermaking raw material flow relative to a rotational direction of the rotor body is located before a leading end portion of a downstream single stirring member relative to the rotational direction of the rotor body
  • a male screw provided in the single stirring member passes through a hole of the cylindrical rotor body, and is tightened and fixed by being screwed into a female screw located in the cylindrical rotor body.
  • the stepped stirring member includes a plurality of single stirring members
  • the single stirring member is a substantially crescent-shaped member in which a width of an intermediate portion is wider than both ends in the longitudinal direction, the longitudinal direction of the single stirring member is substantially parallel to both end surfaces of the cylindrical rotor body
  • the plurality of the single stirring members is adjacently formed stepwise, and the adjacent single stirring members are provided so that a leading end portion of an upstream single stirring member with respect to the papermaking raw material flow relative to a rotational direction of the rotor body is located before a leading end portion of a downstream single stirring member relative to the rotational direction of the rotor body
  • a male screw provided in the cylindrical rotor body passes through a hole of the cylindrical rotor body, and is tightened and fixed by being screwed into a female screw located in the single stirring member.
  • the stepped stirring member includes a plurality of single stirring members, the single stirring member is a substantially crescent-shaped member in which a width of an intermediate portion is wider than both ends in the longitudinal direction, the longitudinal direction of the single stirring member is substantially parallel to both end surfaces of the cylindrical rotor body, the plurality of the single stirring members is adjacently formed stepwise, and the adjacent single stirring members are provided so that a leading end portion of an upstream single stirring member with respect to the papermaking raw material flow relative to a rotational direction of the rotor body is located before a leading end portion of a downstream single stirring member relative to the rotational direction of the rotor body.
  • the papermaking rotor including the cylindrical rotor body, and the stirring member provided on a side surface other than both end surfaces of the rotor body and having a step shape as viewed in a side view. Since the stepped stirring member is formed at the falling gradient with respect to the papermaking raw material flow, the papermaking raw material stirred with the stepped stirring member becomes a form that parries a collision resistance to some extent, and suppresses the power.
  • the forced flow to the downstream side is suppressed by the stirring member of the inclined shape, the precise selection action is caused on small blocks, and at the first stage (front stage), the papermaking raw material that is not precisely selected is guided to the adjacent stirring member of the downstream side. Accordingly, it can effectively perform the careful selection between the adjacent stirring member of downstream side and a portion of the screen facing the stirring member, so that the screen apparatus that is also capable of expecting the energy-saving effect can be obtained.
  • the adjacent single stirring members are provided so that a leading end portion of an upstream single stirring member with respect to a papermaking raw material flow relative to a rotational direction of the rotor body is located before a leading end portion of a downstream single stirring member relative to the rotational direction of the rotor body, and a male screw provided in the single stirring member passes through a hole of the cylindrical rotor body, and is tightened and fixed by being screwed into a female screw located in the cylindrical rotor body. Accordingly, as compared to the attachment by welding, there is no deformation of the cylindrical rotor body, and when the stepped stirring member is damaged, the damaged single stirring member can only be quickly and easily replaced without replacing the entire stepped stirring members.
  • the adjacent single stirring members are provided so that a leading end portion of the upstream single stirring member with respect to the papermaking raw material flow relative to the rotational direction of the rotor body is located before a leading end portion of the downstream single stirring member relative to the rotational direction of the rotor body, and a male screw provided in the cylindrical rotor body passes through a hole of the cylindrical rotor body, and is tightened and fixed by being screwed into a female screw located in the single stirring member. Accordingly, as compared to the attachment by welding, there is no deformation of the cylindrical rotor body, and when the stepped stirring member is damaged, the damaged single stirring member can only be quickly and easily replaced without replacing the entire stepped stirring members.
  • the adjacent single stirring members are provided so that a leading end portion of an upstream single stirring member with respect to the papermaking raw material flow relative to a rotational direction of the rotor body is located before a leading end portion of a downstream single stirring member relative to the rotational direction of the rotor body. Accordingly, when the stepped stirring member is damaged, the damaged single stirring member can only be effectively replaced without replacing the entire stepped stirring members.
  • a screen apparatus A has a tank 1 configured to accept a papermaking raw material, a screen 2 configured to partition the tank 1 into a primary chamber 11 and a secondary chamber 12, and a cylindrical papermaking rotor 6 that is rotatably provided in the primary chamber 11 as the inside of the screen 2 and stirs the papermaking raw material within the primary chamber 11.
  • the screen 2 has a plurality of opening portions 21, for example, the opening portions 21 are gaps in the case of annularly arranging rod-shaped longitudinal members with gaps (longitudinal gaps), round holes provided on the cylindrical side surface, and slits (e.g., elongated rectangular gaps), through which the papermaking raw material passes to the cylindrical side surface, and the screen is secured uprightly to the tank 1 by opening a bottom portion 22.
  • the opening portions 21 are gaps in the case of annularly arranging rod-shaped longitudinal members with gaps (longitudinal gaps), round holes provided on the cylindrical side surface, and slits (e.g., elongated rectangular gaps), through which the papermaking raw material passes to the cylindrical side surface, and the screen is secured uprightly to the tank 1 by opening a bottom portion 22.
  • the papermaking rotor 6 is provided with a cylindrical rotor body 60, and a stirring member 61 having a step shape as viewed in the side view provided so as to protrude to the side surface 60a except for both end surfaces of the rotor body 60.
  • stepped stirring members 61 may be integrated with the rotor body 60 by being welded to the side surface 60a for each member, or the stirring member 61 formed in one member by integrating the four members may be integrated with the rotor body 60 by being welded to the side surface 60a.
  • the stepped stirring member 61 is formed at a falling gradient with respect to a papermaking raw material flow X.
  • the single stirring member (each stirring member) of the stepped stirring member 61 is a substantially crescent-shaped member in which the width of the intermediate portion is wider than both ends in the longitudinal direction, and includes, for example, four stages 61a, 61b, 61c, and 61d.
  • the stepped stirring member 61 includes, for example, the plurality of single stirring members (respective stirring members 61a, 61b, 61c, and 61d), the longitudinal direction of the single stirring member is substantially parallel to both end surfaces of the cylindrical rotor body 60, the plurality of the single stirring members is adjacently formed stepwise, and the adjacent single stirring members 61a and 61b are provided so that a leading end portion (a collision surface) A of the upstream single stirring member 61a with respect to the papermaking raw material flow relative to a rotational direction Y of the rotor body 60 is located before a leading end portion (a collision surface) B of the downstream single stirring member 61b relative to the rotational direction Y of the rotor body 60.
  • the adjacent single stirring members 61b and 61c are provided so that the leading end portion (the collision surface) B of the upstream single stirring member 61b with respect to the papermaking raw material flow X relative to the rotational direction Y of the rotor body 60 is located before a leading end portion (a collision surface) C of the downstream single stirring member 61c relative to the rotational direction Y of the rotor body 60.
  • the adjacent single stirring members 61c and 61d are provided so that the leading end portion (the collision surface) C of the upstream single stirring member 61c with respect to the papermaking raw material flow X relative to the rotational direction Y of the rotor body 60 is located before a leading end portion (a collision surface) D of the downstream single stirring member 61d relative to the rotational direction Y of the rotor body 60.
  • the number of the stages of the stepped stirring member 61 is not limited to four stages, and the number may be two stages, three stages, five stages, six-stage or the like.
  • the collision surfaces A, B, C, and D of the respective stirring members 61a, 61b, 61c, and 61d are parallel to the side surface 60a except for both end surfaces of the rotor body 60, but may be formed so as to incline as illustrated in FIGS. 4 and 5 .
  • the papermaking rotor 6 rotates from a motor which is not illustrated via a power transmission member 7 (for example, a belt).
  • a power transmission member 7 for example, a belt
  • a papermaking raw material supply passage 3 communicates with the primary chamber 11 of the tank 1 and supplies the papermaking raw material to the tank 1.
  • a foreign material discharge passage 4 communicates with the primary chamber 11, and discharges the papermaking raw material containing foreign materials that do not pass through the screen 2 to the outside of the tank 1.
  • a papermaking raw material discharge passage 5 communicates with the secondary chamber 12, and discharges the papermaking raw material that passed through the screen 2 to the outside of the tank 1.
  • the papermaking raw material is supplied into the primary chamber 11.
  • the papermaking raw material collides with the stepped stirring member 61.
  • the papermaking raw material that collided with the stirring member 61 successively collides with the respective stirring members 61a, 61b, 61c, and 61d constituting the stepped stirring member 61, becomes a form that parries the collision resistance to some extent, and suppresses the power.
  • the forced flow to the downstream side is suppressed by the inclined stirring member, and a careful selection action is caused on small blocks.
  • the papermaking raw material that is not properly selected is guided to the adjacent stirring member of the downstream side, and it can effectively performs the effective selection between the adjacent stirring member of the downstream side and a portion of the screen facing the stirring member.
  • the papermaking raw material effectively selected by the screen 2 by increasing the selection efficiency is discharged to the outside of the tank 1 via the papermaking raw material discharge passage 5, and the papermaking raw material containing the foreign material that cannot pass through the screen 2 is discharged to the outside of the tank 1 via the foreign material discharge passage 4.
  • the respective stirring members 61a, 61b, 61c, and 61d also rotate with the rotation of the papermaking rotor 6, the papermaking raw material causes the compression to the screen 2 at the front of the respective stirring members 61a, 61b, 61c, and 61d, and causes the negative pressure to the screen 2 at the rear of the respective stirring members 61a, 61b, 61c, and 61d, and the papermaking raw material is effectively selected by performing the action of the washing on the screen 2.
  • the screen apparatus A of the embodiment described above is the screen of the type that allows the papermaking raw material to flow in from below.
  • the invention is not limited thereto, and a screen apparatus illustrated in FIG. 6 that allows the papermaking raw material to flow in from above can also be similarly applied (the same parts of FIG. 6 as in the above-mentioned embodiment are denoted by the same reference numerals and the description thereof will not be provided).
  • the tank 1 of the screen apparatus A of the above-mentioned embodiment is erected, but the invention is not limited thereto, and although not illustrated, the tank 1 of the screen apparatus A can also be similarly applied to a lying type screen.
  • the four members are integrated with the rotor body 60 by being welded to the side surface 60a for each member, but the invention is not limited thereto, and the stepped stirring member 61 may also be fixed by a male screw and a female screw ( FIGS. 7 to 12 ).
  • the stepped stirring member 61 is formed at the falling gradient with respect to the papermaking raw material flow X
  • the single stirring member of the stepped stirring member 61 is a substantially crescent-shaped member in which the width of the intermediate portion is wider than both end portions in the longitudinal direction, and includes, for example, four stages of 61a, 61b, 61c, and 61d.
  • the stepped stirring member 61 includes a plurality of single stirring members (the respective stirring members, for example, 61a, 61b, 61c, and 61d), the longitudinal direction of the single stirring member is substantially parallel to both end surfaces of the cylindrical rotor body 60, the plurality of the single stirring members is adjacently formed stepwise, and the adjacent stirring members 61a and 61b are provided so that a leading end portion (a collision surface) A of the upstream single stirring member 61a with respect to the papermaking raw material flow X relative to a rotational direction Y of the rotor body 60 is located before a leading end portion (a collision surface) B of the downstream stirring member 61b relative to the rotational direction Y of the rotor body 60.
  • the respective stirring members for example, 61a, 61b, 61c, and 61d
  • the adjacent single stirring members 61b and 61c are provided so that the leading end portion (the collision surface) B of the upstream single stirring member 61b with respect to the papermaking raw material flow X relative to the rotational direction Y of the rotor body 60 is located before a leading end portion (a collision surface) C of the downstream single stirring member 61c relative to the rotational direction Y of the rotor body 50.
  • the adjacent single stirring members 61c and 61d are provided so that the leading end portion (the collision surface) C of the upstream single stirring member 61c with respect to the papermaking raw material flow X relative to the rotational direction Y of the rotor body 60 is located before a leading end portion (a collision surface) D of the downstream single stirring member 61d relative to the rotational direction Y of the rotor body 60.
  • a male screw 61dA provided in the single stirring member 61d passes through a hole 60h of the cylindrical rotor body 60, and is tightened and fixed by being screwed into a female screw Ma positioned in the cylindrical rotor body 60.
  • the single stirring members 61a, 61b, and 61c are provided so that male screws (although not illustrated, the male screws are the same as the male screw 61dA) each provided in the single stirring members 61a, 61b, and 61c pass through the holes 60h (although not illustrated, the holes are the same as the holes 60h) of the cylindrical rotor body 60, and are tightened and fixed by being screwed into female screws (although not illustrated, the female screws are the same as the female screws Ma) located in the cylindrical rotor body 60.
  • a washer W is illustrated in FIGS. 9 to 12 .
  • FIGS. 7 to 11(a) the same portions as the above-mentioned embodiments ( FIGS. 1 to 6 ) are denoted by the same reference numerals, and the description thereof will not be provided.
  • the clearance adjustment of the screen 2 can be made by interposing a thin plate T between the single stirring member 61d and the rotor body 60.
  • the male screw 61dA provided in the single stirring member 61d passes through the hole 60h of the cylindrical rotor body 60, and is tightened and fixed by being screwed into the female screw Md positioned in the cylindrical rotor body 60.
  • a male screw V provided within the cylindrical rotor body 60 may pass through the hole 60h of the cylindrical rotor body 60, and may be tightened and fixed by being screwed into the female screw Mb provided in the single stirring member 61d.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
EP14150389.6A 2013-01-10 2014-01-07 Papermaking screen apparatus Withdrawn EP2754749A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013002264 2013-01-10
JP2013248797A JP6117683B2 (ja) 2013-01-10 2013-12-02 製紙用スクリーン装置

Publications (1)

Publication Number Publication Date
EP2754749A1 true EP2754749A1 (en) 2014-07-16

Family

ID=49949501

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14150389.6A Withdrawn EP2754749A1 (en) 2013-01-10 2014-01-07 Papermaking screen apparatus

Country Status (7)

Country Link
US (1) US20140190646A1 (ja)
EP (1) EP2754749A1 (ja)
JP (1) JP6117683B2 (ja)
KR (1) KR101924348B1 (ja)
CN (1) CN103924473A (ja)
CA (1) CA2838518C (ja)
TW (1) TW201433673A (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6517675B2 (ja) * 2015-12-02 2019-05-22 相川鉄工株式会社 製紙用スクリ−ン装置

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993022494A1 (en) * 1992-04-23 1993-11-11 A. Ahlstrom Corporation Apparatus for treating fiber suspension
DE20304303U1 (de) * 2003-03-18 2004-07-22 Voith Paper Patent Gmbh Drucksortierer zum Sieben einer Papierfaserstoffsuspension und Siebräumer für einen solchen
JP2005171449A (ja) 2003-12-15 2005-06-30 Aikawa Iron Works Co Ltd 製紙用スクリ−ン装置
JP2008223151A (ja) 2007-03-08 2008-09-25 Aikawa Iron Works Co Ltd 製紙用スクリーン装置
WO2008119880A1 (en) * 2007-03-30 2008-10-09 Advanced Fiber Technologies (Aft) Oy Rotor element and a rotor for a screening apparatus
DE102009007637A1 (de) * 2009-02-05 2010-08-12 Voith Patent Gmbh Verfahren zum Sortieren einer Faserstoffsuspension sowie Vorrichtung zu seiner Durchführung
WO2012084562A1 (de) * 2010-12-22 2012-06-28 Voith Patent Gmbh Drucksortierer

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5192438A (en) * 1983-03-07 1993-03-09 A. Ahlstrom Corporation Rotating element for screening apparatus with a contour surface produced by a plurality of protrusions in the direction of the axial length of the rotor
DE3572928D1 (en) * 1984-12-25 1989-10-19 Mitsubishi Heavy Ind Ltd Pressure slit screen
JP3076645B2 (ja) * 1991-11-26 2000-08-14 株式会社サトミ製作所 紙料精選装置
DE19911884A1 (de) * 1999-03-17 2000-09-21 Voith Sulzer Papiertech Patent Drucksortierer zum Sieben einer Papierfaserstoffsuspension und Siebräumer für einen solchen
JP3702138B2 (ja) * 2000-01-18 2005-10-05 三菱重工業株式会社 紙料攪拌精選装置
US6942104B2 (en) * 2003-09-02 2005-09-13 Gl&V Management Hungary Kft. Rotor with multiple foils for screening apparatus for papermaking pulp
DE102006008758A1 (de) * 2006-02-24 2007-08-30 Voith Patent Gmbh Rotor für einen Drucksortierer für Fasersuspensionen

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1993022494A1 (en) * 1992-04-23 1993-11-11 A. Ahlstrom Corporation Apparatus for treating fiber suspension
DE20304303U1 (de) * 2003-03-18 2004-07-22 Voith Paper Patent Gmbh Drucksortierer zum Sieben einer Papierfaserstoffsuspension und Siebräumer für einen solchen
JP2005171449A (ja) 2003-12-15 2005-06-30 Aikawa Iron Works Co Ltd 製紙用スクリ−ン装置
JP2008223151A (ja) 2007-03-08 2008-09-25 Aikawa Iron Works Co Ltd 製紙用スクリーン装置
WO2008119880A1 (en) * 2007-03-30 2008-10-09 Advanced Fiber Technologies (Aft) Oy Rotor element and a rotor for a screening apparatus
DE102009007637A1 (de) * 2009-02-05 2010-08-12 Voith Patent Gmbh Verfahren zum Sortieren einer Faserstoffsuspension sowie Vorrichtung zu seiner Durchführung
WO2012084562A1 (de) * 2010-12-22 2012-06-28 Voith Patent Gmbh Drucksortierer

Also Published As

Publication number Publication date
KR20140090939A (ko) 2014-07-18
CA2838518C (en) 2020-09-22
KR101924348B1 (ko) 2018-12-03
JP6117683B2 (ja) 2017-04-19
CN103924473A (zh) 2014-07-16
US20140190646A1 (en) 2014-07-10
TW201433673A (zh) 2014-09-01
CA2838518A1 (en) 2014-07-10
JP2014148777A (ja) 2014-08-21

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