CA2461732A1 - Extraction bedplate with laser or water jet cut apertures - Google Patents

Extraction bedplate with laser or water jet cut apertures Download PDF

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Publication number
CA2461732A1
CA2461732A1 CA002461732A CA2461732A CA2461732A1 CA 2461732 A1 CA2461732 A1 CA 2461732A1 CA 002461732 A CA002461732 A CA 002461732A CA 2461732 A CA2461732 A CA 2461732A CA 2461732 A1 CA2461732 A1 CA 2461732A1
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CA
Canada
Prior art keywords
holes
recited
metal plate
cross sections
bedplate
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.)
Granted
Application number
CA002461732A
Other languages
French (fr)
Other versions
CA2461732C (en
Inventor
David E. Chupka
Christopher L. Demler
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.)
Kadant Black Clawson Inc
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2461732A1 publication Critical patent/CA2461732A1/en
Application granted granted Critical
Publication of CA2461732C publication Critical patent/CA2461732C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/345—Pulpers
    • D21B1/347—Rotor assemblies
    • 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
    • D21B1/34—Kneading or mixing; Pulpers
    • D21B1/345—Pulpers
    • 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

Abstract

The present invention relates to extraction bedplates (10), (110), (210), (310), (410), (510), (610) for use in apparatus (5) for defiberizing paper making stock and methods for making such bedplates. Preferred methods for making such bedplates (10), (110), (210), (310), (410), (510), (610) include the step of cutting a disc shaped blank from a metal plate and the step of forming holes (45), (145), (245), (345), (445), (545), (645), (646) either t he metal plate or the disc shaped blank. The holes (45), (145), (245), (345), (445), (545), (645), (646) preferably are formed using a cutting stream, mos t preferably either a laser or a water jet. Use of a cutting stream to form th e holes facilitates the cutting of holes (45), (145), (245), (345), (445), (545), (645), (646) having non-circular, and preferably tesselatory, cross sections as well as holes (45), (145), (245), (345), (445), (545), (645), (646) extending at acute angles with respect to an axis (20) of the bedplate .

Claims (31)

1. An extraction bedplate for use in defiberizing stock for making paper, comprising:
a plate defining first and second surfaces; and a plurality of holes lacking substantially circular cross-sections extending from said first surface to said second planar surface.
2. The extraction bedplate as recited in claim 1, wherein said plate defines an axis normal to said first and second surfaces and wherein said holes extend at an acute angle with respect to said axis.
3. The extraction bedplate as recited in claim 1, wherein said plate defines an axis normal to said first and second surface; said holes are arranged along arcs coincident with anticipated stock flow lines immediately above the upstream surface of said bedplate; and said holes are extend through said bedplate at an acute angle along said anticipated stock flow lines so as to define relatively sharp downstream side edges facing said anticipated flow lines.
4. The extraction bedplate as recited in claim 1, wherein said holes have cross sections which tesselate a plane.
5. The extraction bedplate as recited in claim 1, wherein said holes have substantially rhombic cross sections.
6. The extraction bedplate as recited in claim 1, wherein said holes have substantially square cross sections.
7. The extraction bedplate as recited in claim 1, wherein said holes have substantially rectangular cross sections.
8. The extraction bedplate as recited in claim 1, wherein said holes have substantially chevronic cross sections.
9. The extraction bedplate as recited in claim 1, wherein said holes have substantially triangular cross sections.
10. The extraction bedplate as recited in claim 1, wherein said holes have substantially crescentic cross sections.
11. The extraction bedplate as recited in claim 1, wherein said holes have substantially semi-circular cross-sections.
12. An extraction bedplate for use in defiberizing stock for making paper, comprising:
a plate defining a first surface, a second surface and an axis normal to said first and second surfaces; and a plurality of holes extending through said plate symmetrically at an acute angle with respect to said axis from said first surface to said second planar surface.
13. The extraction bedplate as recited in claim 12, wherein said holes have cross sections in the shape of polygons which tesselate a plane.
14. The extraction bedplate as recited in claim 12, wherein said holes have substantially circular cross sections
15. The extraction bedplate as recited in claim 12, wherein said holes have substantially rhombic cross sections.
16. The extraction bedplate as recited in claim 12, wherein said holes have substantially square cross sections.
17. The extraction bedplate as recited in claim 12, wherein said holes have substantially rectangular cross sections.
18. The extraction bedplate as recited in claim 12, wherein said holes have substantially chevronic cross sections.
19. The extraction bedplate as recited in claim 12, wherein said holes have substantially triangular cross sections.
20. The extraction bedplate as recited in claim 12, wherein said holes have substantially crescentic cross sections.
21. The extraction bedplate as recited in claim 12, wherein said holes have substantially semi-circular cross sections.
22. A method for fabricating an extraction bedplate from a metal plate defining a first surface and a second surface, said method comprising the steps of:
(a) cutting a disc-shaped blank from said metal plate; and (b) forming a plurality of holes lacking substantially circular cross-sections through one of said metal plate and said disc-shaped blank from said first surface to said second surface.
23. The method as recited in claim 22, wherein said step (b) includes directing a stream of energy against said one of said metal plate and said disc-shaped blank to ablate said plurality of holes.
24. The method as recited in claim 23, wherein said step (b) includes directing a stream of laser energy against said one of said metal plate and said disc-shaped blank to ablate said plurality of holes.
25. The method as recited in claim 22, wherein said step (b) includes directing a stream of pressurized fluid against said one of said metal plate and said disc-shaped blank to cut said plurality of holes.
26. The method as recited in claim 22, wherein said step (b) includes directing a cutting stream against said one of said metal plate and said disc-shaped blank and wherein said method includes the additional step of:
(c) programming a programmable electronic controller to induce said cutting stream to move across said one of said metal plate and said disc-shaped blank so as to shape said plurality of holes.
27. A method for fabricating an extraction bedplate from a metal plate defining a first surface and a second surface, said method comprising the steps of:
(a) cutting a disc-shaped blank from said metal plate; and (b) forming a plurality of holes extending symmetrically with respect to said axis at an acute angle with respect to said axis through one of said metal plate and said disc-shaped blank from said first surface to said second surface.
28. The method as recited in claim 27, wherein said step (b) includes directing a stream of energy against said one of said metal plate and said disc-shaped blank to ablate said plurality of holes.
29. The method as recited in claim 28, wherein said step (b) includes directing a stream of laser energy against said one of said metal plate and said disc-shaped blank to ablate said plurality of holes.
30. The method as recited in claim 27, wherein said step (b) includes directing a stream of pressurized fluid against said one of said metal plate and said disc-shaped blank to cut said plurality of holes.
31. The method as recited in claim 27, wherein said step (b) includes directing a cutting stream against said one of said metal plate and said disc-shaped blank and wherein said method includes the additional step of:
(c) programming a programmable electronic controller to induce said cutting stream to move across said one of said metal plate and said disc-shaped blank so as to shape said plurality of holes.
CA2461732A 2001-10-18 2002-07-18 Extraction bedplate with laser or water jet cut apertures Expired - Lifetime CA2461732C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US33035701P 2001-10-18 2001-10-18
US60/330,357 2001-10-18
PCT/US2002/022872 WO2003033152A1 (en) 2001-10-18 2002-07-18 Extraction bedplate with laser or water jet cut apertures

Publications (2)

Publication Number Publication Date
CA2461732A1 true CA2461732A1 (en) 2003-04-24
CA2461732C CA2461732C (en) 2010-05-25

Family

ID=23289402

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2461732A Expired - Lifetime CA2461732C (en) 2001-10-18 2002-07-18 Extraction bedplate with laser or water jet cut apertures

Country Status (9)

Country Link
US (3) US7628890B2 (en)
EP (2) EP1450958B1 (en)
JP (1) JP2005505415A (en)
CN (2) CN100337784C (en)
AT (1) ATE430622T1 (en)
CA (1) CA2461732C (en)
DE (1) DE60232267D1 (en)
ES (1) ES2323575T3 (en)
WO (1) WO2003033152A1 (en)

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CN103031767A (en) * 2011-09-29 2013-04-10 安德里茨（中国）有限公司 Screen piece for treating fiber suspension
JP6460741B2 (en) * 2014-08-06 2019-01-30 相川鉄工株式会社 Papermaking strainer and papermaking foreign matter separating device
CN104528413B (en) * 2014-11-18 2016-09-07 南宁侨虹新材料有限责任公司 Dust-free paper forming box rotary drum jetting type uniform distribution device
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DE102016202586A1 (en) * 2016-02-19 2017-08-24 Voith Patent Gmbh pulper
CN111347218A (en) * 2018-12-20 2020-06-30 广西盛誉糖机制造有限责任公司 Screen mesh manufacturing process
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Also Published As

Publication number Publication date
EP2080557A1 (en) 2009-07-22
US20050039615A1 (en) 2005-02-24
EP1450958A4 (en) 2006-06-21
ATE430622T1 (en) 2009-05-15
US8172985B2 (en) 2012-05-08
CN101105014B (en) 2010-06-02
DE60232267D1 (en) 2009-06-18
CA2461732C (en) 2010-05-25
ES2323575T3 (en) 2009-07-21
WO2003033152A1 (en) 2003-04-24
US20100065670A1 (en) 2010-03-18
EP1450958B1 (en) 2009-05-06
US7628890B2 (en) 2009-12-08
US20070245907A1 (en) 2007-10-25
EP1450958A1 (en) 2004-09-01
CN1568229A (en) 2005-01-19
CN100337784C (en) 2007-09-19
JP2005505415A (en) 2005-02-24
CN101105014A (en) 2008-01-16

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Effective date: 20220718