US20080017342A1 - Screen apparatus - Google Patents

Screen apparatus Download PDF

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Publication number
US20080017342A1
US20080017342A1 US11/826,234 US82623407A US2008017342A1 US 20080017342 A1 US20080017342 A1 US 20080017342A1 US 82623407 A US82623407 A US 82623407A US 2008017342 A1 US2008017342 A1 US 2008017342A1
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US
United States
Prior art keywords
screen
paper
making material
sealed casing
foreign matter
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.)
Abandoned
Application number
US11/826,234
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English (en)
Inventor
Yoshihiko 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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=38654548&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=US20080017342(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Aikawa Iron Works Co Ltd filed Critical Aikawa Iron Works Co Ltd
Assigned to AIKAWA IRON WORKS CO., LTD. reassignment AIKAWA IRON WORKS CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AIKAWA, YOSHIHIKO
Publication of US20080017342A1 publication Critical patent/US20080017342A1/en
Abandoned 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
    • D21D5/023—Stationary screen-drums
    • D21D5/026—Stationary screen-drums with rotating cleaning foils
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F1/00—Wet end of machines for making continuous webs of paper
    • D21F1/66—Pulp catching, de-watering, or recovering; Re-use of pulp-water
    • D21F1/74—Pulp catching, de-watering, or recovering; Re-use of pulp-water using cylinders

Definitions

  • the present invention relates to a screen apparatus for refining a paper-making material by feeding it outward of the screen from the inside thereof, and more particularly to a screen apparatus whose capacity for separating foreign matter from fibers in the paper-making material that are acceptable in the quality has been enhanced.
  • the present invention sets out to provide a screen apparatus which eliminates the problem described above.
  • a first aspect of the present invention provides a screen apparatus comprising: a sealed casing having a paper-making material supply port, a refined paper-making material discharge port positioned above the paper-making material supply port and a foreign matter discharge port positioned above the refined paper-making material discharge port; a screen for dividing the interior of the sealed casing into a first chamber and a second chamber and for separating foreign matter existing in the paper-making material, the screen being of a cylindrical shape and with end portions that are both open, the screen having circular holes or slit-like openings on a side face thereof and stood within the sealed casing in such a way that a direction of height thereof faces a vertical direction, both open end portions of the screen having an upper opening portion and a lower opening portion with the upper opening portion positioned below the foreign matter discharge port and the lower opening portion positioned above the paper-making material supply port; a paper-making material supply passage connected to the paper-making material supply port in order to supply paper-making material to a first chamber from a downward direction;
  • a ring portion provided at a midway position on the screen, the screen being divided by the ring portion into an upstream screen portion and a downstream screen portion, the ring portion being provided with a diluted water introduction port for introducing diluted water into the first chamber; a diluted water passage provided via the sealed casing and connected to the diluted water introduction port; and an uneven portion provided on a side opposing a rotor of the ring portion, wherein a convex portion of the uneven portion is provided so as to project from an inside wall face of the screen, and the uneven portion has a front end portion of the convex portion and a rear end portion of the convex portion that relative to a vertical direction of the casing is positioned lower than the front end portion of the convex portion, and which front end portion is tilted in such a way that relative to a rotational direction of the rotor the front end portion of the convex portion is nearer the rear end portion of the convex portion.
  • a ring portion provided at a midway position on the screen, the screen being divided by the ring portion into an upstream screen portion and a downstream side screen portion, the ring portion being provided with a diluted water introduction port for introducing diluted water into the first chamber; a diluted water passage provided via the sealed casing and connected to a diluted water introduction port; and an uneven portion provided on a side opposing a rotor of the ring portion, wherein a convex portion of the uneven portion is provided not to project from an inside wall face of the screen and the uneven portion has a front end portion of the convex portion and a rear end portion of the convex portion that relative to a vertical direction of the casing is positioned lower than the front end portion of the convex portion, and which front end portion is tilted in such a way that relative to a rotational direction of the rotor the front end portion of the convex portion is located nearer than the rear end portion of the convex
  • the screen apparatus of the first aspect includes a water supply passage that is mounted on the sealed casing in such a way that a water spouting port opposes the top end face of the rotor, water colliding with the top end face of the rotor flows in a substantially horizontal direction, thereby hampering the flow of a paper-making material processing toward the refined paper-making material discharge port from the opening portion at the top of the screen.
  • this action forces back upstream of the first chamber fibers, which were flowing out to the foreign matter discharge port by reject sealing, thereby enhancing the capacity of the screen apparatus for separating foreign matter from fibers of an acceptable quality contained in the paper-making material.
  • diluted water from the diluted water introduction port acts to hamper the flow of a paper-making material flowing downstream, thereby enhancing the capacity of the screen apparatus for separating foreign matter from fibers of an acceptable quality contained in the paper-making material. Further, the paper-making material passes through the screen upstream and a paper-making material whose density has been intensified is diluted with diluted water so as to enhance the capacity of the screen apparatus for separating fibers of an acceptable quality.
  • the convex portion of an uneven portion provided on the side facing the rotor of the ring portion is tilted in such a way that relative to the rotational direction of the rotor a front end portion of the convex portion is positioned closer than the rear end portion of the convex portion. Consequently, pieces in the paper-making material that have not yet melted and that collide with the convex portion are not only separated but also brought back upstream of the paper-making material, thereby further enhancing the capacity of the screen apparatus for separating foreign matter from fibers of an acceptable quality that are contained in the paper-making material.
  • diluted water from the diluted water introduction port acts to hamper the flow of a paper-making material flowing downstream, thereby enhancing the capacity of the screen apparatus for separating foreign matter from fibers of an acceptable quality that are contained in paper-making material. Further, the paper-making material passes through the screen upstream and a paper-making material whose density has been intensified is diluted with diluted water so as to enhance the capacity of the screen apparatus for separating fibers of an acceptable quality.
  • the convex portion of the uneven portion provided on the side facing the rotor of the ring portion is tilted in such a way that relative to the rotational direction of the rotor a front end portion of the convex portion is positioned closer than the rear end portion of the convex portion. Consequently, pieces in the paper-making material that have not yet melted and that collide with the convex portion are not only separated but also brought back upstream of the paper-making material, thereby further enhancing the capacity of the screen apparatus for separating foreign matter from fibers of an acceptable quality that are contained in the paper-making material.
  • FIG. 1 is a schematic sectional view of a screen apparatus according to an embodiment of the present invention
  • FIG. 2 is a schematic sectional view taken along the line 2 - 2 of FIG. 1 ;
  • FIG. 3 is a schematic view of a screen in the vicinity of a ring portion as seen from the inside of the screen;
  • FIG. 4 is a schematic partially enlarged sectional view showing part of FIG. 1 in enlargement
  • FIG. 5 is a schematic sectional view taken along the line 5 - 5 of FIG. 4 ;
  • FIG. 6 is a schematic sectional view of a screen apparatus according to another embodiment different from FIG. 1 ;
  • FIG. 7 is a schematic plan view of a rotor of FIG. 6 ;
  • FIG. 8 is a schematic partially enlarged sectional view showing part of FIG. 6 in an enlarged form
  • FIG. 9 is a schematic partial sectional view of a screen apparatus according to another embodiment that is different from FIG. 8 ;
  • FIG. 10 is a schematic partial sectional view of a screen apparatus according to another embodiment that is different from FIG. 5 ;
  • FIG. 11 is a schematic partial sectional view of a screen apparatus according to another embodiment that is different from FIG. 4 ;
  • FIG. 12( a ) is a schematic sectional view taken along the line 12 - 12 of FIG. 11
  • FIG. 2( b ) is a view of a ring portion of FIG. 12( a ) as seen from the inside of the screen.
  • symbol S denotes a screen apparatus that has a sealed-type casing 1 including a paper-making material supply port 1 a , a refined paper-making material discharge port 1 b located above the paper-making material supply port 1 a, a foreign matter discharge port 1 c located above this refined paper-making material discharge port 1 b and a heavy foreign matter discharge port 1 d .
  • This screen apparatus S is a so-called “outward type” screen apparatus (centrifugal type) which refines a paper-making material by feeding it outward from inside of the screen 2 in order to remove foreign matter (for example, plastics) contained in the paper-making material (for example, old newspapers and old corrugated board).
  • outward type screen apparatus centrifugal type
  • the interior of the sealed-type casing 1 is divided by a screen 2 into a first chamber 1 A and a second chamber 1 B.
  • This screen 2 is intended to separate foreign matter in the paper-making material.
  • the screen 2 is of a cylindrical shape, its end portions are both open, its side face has circular holes or slit-like opening portions and it is stood within the sealed casing 1 in such a way that the direction of its height faces a vertical direction.
  • Both open end portions of the screen 2 include an upper opening portion 2 A and a lower opening portion 2 B. As shown in FIG. 1 , the upper opening portion 2 A is located below the foreign matter discharge port 1 c and the lower opening portion 2 B is located above the paper-making material supply port 1 a.
  • Symbol R shown in FIGS. 1-5 denotes a ring portion provided midway on the screen 2 , the screen 2 is divided into an upstream screen portion 21 and a downstream screen portion 22 by this ring portion R and the ring portion R has diluted water introduction ports R 1 (for example, a plurality of) for purposes of introducing diluted water into the first chamber 1 A.
  • Reference numeral 20 denotes a diluted water passage for introducing diluted water, a passage which is connected with the diluted water introduction port R 1 and is provided via the sealed casing 1 .
  • a face of the ring portion R that faces the rotor 7 includes convex portions RT that project from the face of the screen 2 and concave portions RO (see FIGS. 3 , 5 ).
  • a convex portion RT provided on a side facing the rotor 7 of the ring portion R in such a way that it projects from the face of the screen 2 has a front end portion X of the convex portion and a rear end portion Y of the convex portion that is positioned at a lower position relative to the vertical direction than the front end portion X of the convex portion, and that is tilted in such a way that relative to the rotational direction of the rotor 7 (see the direction of an arrow in FIG. 3 ) the front end portion X of the convex portion is positioned closer than the rear end portion Y of the convex portion.
  • the inclination angle is, for example, 3° and 45°.
  • pieces contained in a paper-making material that have not yet melted and that collide with the convex portion RT are not only separated but are also made to return upstream of the paper-making material, and in consequence the effect of separation between foreign matter and acceptable fibers in the paper-making material.
  • the aforementioned convex portion RT and a concave portion RO could also be described as an uneven face provided on a side facing the rotor 7 of the ring portion R.
  • the convex portion RT of this uneven face is provided to project from the inner wall face of the screen 2 and has the front end portion X and a rear end portion Y that is positioned lower than the front end portion relative to the vertical direction of the casing 1 .
  • the convex portion RT is tilted in such a way that relative to the rotational direction (see the direction of arrow in FIG. 3 ) of the rotor 7 the front end portion of the convex portion RT is located nearer the rear end portion Y of the convex portion RT.
  • Reference numeral 3 in FIG. 1 denotes a paper-making material supply passage which is connected to the paper-making material supply port 1 a in order to supply a paper-making material to the first chamber 1 A from a downward direction.
  • Reference numeral 4 denotes a refined paper-making material discharge passage connected to the refined paper-making material discharge port 1 b in order to guide the refined paper-making material outside the sealed casing 1 via the screen 2 .
  • Reference numeral 5 denotes a foreign matter discharge passage that is connected to the first chamber 1 A and that is also connected to the heavy foreign matter discharge port 1 c in order to guide foreign matter (for example, relatively light foreign matter) existing in the paper-making material and which does not pass through the screen 2 outside the sealed casing.
  • Reference numeral 6 denotes a heavy foreign matter discharge passage that is connected with the first chamber 1 A and that is also connected to the heavy foreign matter discharge port 1 d in order to guide relatively heavy foreign matter existing in the paper-making material and which does not pass through the screen 2 outside the sealed casing 1 .
  • Reference numeral 7 denotes a rotor, which is disposed inside the screen 2 within the first chamber 1 A and has on its outer periphery an agitating member 7 a for agitating the paper-making material in the sealed casing 1 .
  • the rotor 7 has an upstream portion 70 on the upstream side and a downstream portion 71 on the downstream side and agitating members 7 a provided on the outer peripheries of the upstream portion 70 and of the downstream portion 71 are tilted.
  • the tilt is set in such a way that a bottom portion 7 A of a substantially linear portion of the agitating member 7 a advances more in the rotational direction of the rotor 7 than a top portion 7 B.
  • a rotation from the motor is transmitted via a belt 8 and a rotating shaft 9 so as to rotate the rotor 7 .
  • Reference numeral 10 in FIG. 1 denotes a water supply passage provided on the sealed casing 1 in such a way that a water spouting port 10 a opposes a top end face 7 T (more preferably, in such a away that the water spouting port 10 a opposes the center of the top end face 7 T of the rotor 7 ).
  • paper-making material proceeds downstream is hampered by diluted water supplied from the diluted water introduction port R 1 midway on the screen 2 , thereby enhancing the capacity of the screen apparatus for separating foreign matter in the paper-making material from fibers of an acceptable quality. Further, paper-making material passes through the screen 2 upstream so that paper-making material whose density has been intensified is diluted by diluted water so as to intensify the effects of separating fibers of an acceptable quality.
  • the foreign matter discharge passage 5 and the heavy foreign matter discharge passage 6 are appropriately adjusted in degrees of opening, or are opened or closed, by valves (not shown) for opening and closing the passages so as to guide foreign matter deposited within the first chamber 1 A out of the sealed casing 1 .
  • an end portion of the lower portion 7 A of the agitating member 7 a on the downstream side is extended up to a position opposing the diluted water introduction port R 1 (see FIG. 1 )
  • the present invention need not restricted and, as shown in FIG. 6 , it is permissible to eliminate the portion of the agitating member 7 a that opposes the diluted water introduction port R 1 .
  • top end face 7 T of the rotor 7 is formed on a flat surface (see FIG. 1 ), the present invention need not be restricted to this example, and it is permissible to provide projections (scraping blades) 7 z , as shown in FIGS. 6-8 , and change the flow direction of water from the water spouting port 10 a to a horizontal direction with the use of centrifugal force by the projections (scraping blades) 7 Z, thereby intensifying the effects of reject sealing described above. Further, the arrow shown in FIG. 7 indicates the rotational direction of the rotor 7 .
  • an opening width W in the circumferential direction of the ring portion R of the concave portion R 0 shown in FIG. 5 is set so as to be less than the length L of the flat face in the circumferential direction of the ring portion R of the convex portion RT
  • the present invention is not restricted to this example.
  • the opening width W in the circumferential direction of the ring portion R of the concave portion R 0 may also be set so as to be greater than the length L of the flat face in the circumferential direction of the ring portion R of the convex portion RT.
  • the convex portion RT is provided so as to project from the face of the screen 2 to the side facing the rotor 7 of the ring portion R
  • the present invention need not be restricted to this example.
  • the convex portion RT of the uneven face may also be provided on the side facing the rotor 7 of the ring portion R in such a way that it does not project from the inside wall face of the screen 2 .
  • the type shown in FIGS. 11 , 12 is the same as the one described in FIGS. 3-5 , except that the convex portion RT is not projected from the face (inside wall) of the screen 2 , identical reference numerals have been attached to the same components as those described in FIGS. 3-5 , and a description thereof has accordingly partly omitted.
  • the convex portion RT has a front end portion X of the uneven portion and a rear end portion Y which relative to the vertical direction of the casing 1 is positioned at a position lower than the front end portion X of the convex portion RT and is tilted in such a way that relative to the rotational direction of the rotor 7 (see the direction of an arrow shown in FIG. 12( b )) the front end portion X of the convex portion RT is nearer than the rear end portion Y of the convex portion RT.
  • a concave portion RO is located between adjoining convex portions RT and a plurality of each of the convex portions RT and of the concave portions RO are provided on the ring portion R.
  • the convex portion RT described in FIGS. 11 , 12 can enhance the capacity of the screen apparatus for separating foreign matter from fibers of an acceptable quality in paper-making material like the convex portion RT described in FIGS. 3-5 , because pieces that have not yet melted and that are in the paper-making material collide with the convex portion RT are not only separated but also brought back upstream of the paper-making material.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
  • Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
US11/826,234 2006-07-24 2007-07-13 Screen apparatus Abandoned US20080017342A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2006-200886 2006-07-24
JP2006200886 2006-07-24
JP2006260606A JP4909693B2 (ja) 2006-07-24 2006-09-26 スクリーン装置
JP2006-260606 2006-09-26

Publications (1)

Publication Number Publication Date
US20080017342A1 true US20080017342A1 (en) 2008-01-24

Family

ID=38654548

Family Applications (1)

Application Number Title Priority Date Filing Date
US11/826,234 Abandoned US20080017342A1 (en) 2006-07-24 2007-07-13 Screen apparatus

Country Status (8)

Country Link
US (1) US20080017342A1 (ja)
EP (1) EP1882773B1 (ja)
JP (1) JP4909693B2 (ja)
KR (1) KR101297124B1 (ja)
CN (1) CN101113579B (ja)
CA (1) CA2593807A1 (ja)
ES (1) ES2376903T3 (ja)
TW (1) TW200813294A (ja)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104233896B (zh) * 2014-09-02 2016-07-06 郑州运达造纸设备有限公司 一种用于压力筛的稀释装置
CA2895789A1 (en) 2014-11-21 2016-05-21 Aikawa Iron Works Co., Ltd. Papermaking strainer, foreign material separation apparatus for papermaking, and manufacturing method of papermaking strainer
JPWO2016152895A1 (ja) * 2015-03-24 2018-01-18 エム・テクニック株式会社 攪拌機
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
KR101771371B1 (ko) 2016-12-26 2017-08-24 나성주 제지 원료 정선을 위한 스크린 머신, 스크린 머신용 케이싱 바디 및 스크린 바스켓

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3437204A (en) * 1965-12-27 1969-04-08 Bird Machine Co Screening apparatus
US3586172A (en) * 1968-04-16 1971-06-22 Ingersoll Rand Canada Screening apparatus
US4634521A (en) * 1983-10-25 1987-01-06 Ahlstrom Corp Screening apparatus with light reject removal
US5096127A (en) * 1990-08-22 1992-03-17 Ingersoll-Rand Company Apparatus for pressurized screening of a fibrous material liquid suspension
US5564572A (en) * 1993-10-20 1996-10-15 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Method and apparatus for screening waste paper pulp
US6149015A (en) * 1999-04-23 2000-11-21 Aikawa Iron Works Co., Ltd. Screen apparatus for papermaking material
US6171448B1 (en) * 1998-02-03 2001-01-09 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Apparatus for screening waste paper pulp
US6679384B1 (en) * 1999-02-26 2004-01-20 Kadant Lamort Method and means for paper pulp filtering
US20040112797A1 (en) * 2002-10-16 2004-06-17 Yoshihiko Aikawa Screen apparatus

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1288732C (en) * 1985-08-09 1991-09-10 Christian Sauzedde Apparatus for screening paper fiber stock
FI76139C (fi) * 1987-01-19 1988-09-09 Ahlstroem Oy Foerfarande och anordning foer kvistseparering.
JPH0460594A (ja) * 1990-06-29 1992-02-26 Yamaha Corp 弦楽器
JP2005171449A (ja) * 2003-12-15 2005-06-30 Aikawa Iron Works Co Ltd 製紙用スクリ−ン装置
JP2006089874A (ja) * 2004-09-24 2006-04-06 Aikawa Iron Works Co Ltd スクリーン装置
JP2006169662A (ja) * 2004-12-15 2006-06-29 Aikawa Iron Works Co Ltd スクリーン装置

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3437204A (en) * 1965-12-27 1969-04-08 Bird Machine Co Screening apparatus
US3586172A (en) * 1968-04-16 1971-06-22 Ingersoll Rand Canada Screening apparatus
US4634521A (en) * 1983-10-25 1987-01-06 Ahlstrom Corp Screening apparatus with light reject removal
US5096127A (en) * 1990-08-22 1992-03-17 Ingersoll-Rand Company Apparatus for pressurized screening of a fibrous material liquid suspension
US5564572A (en) * 1993-10-20 1996-10-15 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Method and apparatus for screening waste paper pulp
US5597075A (en) * 1993-10-20 1997-01-28 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Method and apparatus for screening waste paper pulp
US6171448B1 (en) * 1998-02-03 2001-01-09 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Apparatus for screening waste paper pulp
US6679384B1 (en) * 1999-02-26 2004-01-20 Kadant Lamort Method and means for paper pulp filtering
US6149015A (en) * 1999-04-23 2000-11-21 Aikawa Iron Works Co., Ltd. Screen apparatus for papermaking material
US20040112797A1 (en) * 2002-10-16 2004-06-17 Yoshihiko Aikawa Screen apparatus

Also Published As

Publication number Publication date
ES2376903T3 (es) 2012-03-20
CA2593807A1 (en) 2008-01-24
CN101113579A (zh) 2008-01-30
KR20080009634A (ko) 2008-01-29
EP1882773A1 (en) 2008-01-30
KR101297124B1 (ko) 2013-08-21
TW200813294A (en) 2008-03-16
CN101113579B (zh) 2012-07-11
JP2008050738A (ja) 2008-03-06
EP1882773B1 (en) 2011-12-28
JP4909693B2 (ja) 2012-04-04

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Legal Events

Date Code Title Description
AS Assignment

Owner name: AIKAWA IRON WORKS CO., LTD., JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:AIKAWA, YOSHIHIKO;REEL/FRAME:019641/0861

Effective date: 20070703

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION