WO2016108838A1 - Motif pour une meule de défibrage fournissant des caractéristiques d'usure améliorées - Google Patents

Motif pour une meule de défibrage fournissant des caractéristiques d'usure améliorées Download PDF

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Publication number
WO2016108838A1
WO2016108838A1 PCT/US2014/072736 US2014072736W WO2016108838A1 WO 2016108838 A1 WO2016108838 A1 WO 2016108838A1 US 2014072736 W US2014072736 W US 2014072736W WO 2016108838 A1 WO2016108838 A1 WO 2016108838A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulpstone
lands
grooves
groove
width
Prior art date
Application number
PCT/US2014/072736
Other languages
English (en)
Inventor
Brian A. RUESTOW
Jukka K. YLIKOSKI
Original Assignee
Norton Pulpstones, Inc.
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 Norton Pulpstones, Inc. filed Critical Norton Pulpstones, Inc.
Priority to PCT/US2014/072736 priority Critical patent/WO2016108838A1/fr
Publication of WO2016108838A1 publication Critical patent/WO2016108838A1/fr

Links

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
    • D21B1/14—Disintegrating in mills
    • D21B1/18—Disintegrating in mills in magazine-type machines
    • D21B1/24—Disintegrating in mills in magazine-type machines of the pocket type

Definitions

  • This disclosure relates to pulpstones used in the paper industry for the production of ground wood pulp.
  • lands 17 come into contact with the logs 9 and groove areas 18 pass over the surface of the logs 9, thereby creating oscillation between mechanical compression and decompression that generates heat.
  • the heat softens the lignin of the wood and the rotational forces acting on the logs 9 loosen and remove the wood fiber.
  • Adjacent pairs of the lands are separated by a distance in a range from 20 mm through 80 mm.
  • Each of the lands can have a width in a range from 6 mm through 40 mm.
  • Each base surface can have a dimension in a circumferential direction between the pair of sidewalls of the groove equal to at least a plurality of average active grit diameters.
  • the lands can have a helical angle with respect to the rotational axis of the pulpstone from 0° to 60°.
  • the lands may be parallel to one another across the pulpstone.
  • the pulpstone has a core with a fixing surface and multiple segments connected to the fixing surface.
  • Each of the segments are formed of ceramic-bonded abrasive.
  • the segments together define the cylindrical outer surface of the pulpstone.
  • FIG. 2 is an enlarged cross-sectional view of an outer surface of a pulpstone showing a V-shaped groove pattern formed therein according to the prior art
  • FIG. 6 is an enlarged cross-sectional view of a pulpstone surface wherein the land width is greater than the groove width
  • a pulpstone 20 formed in accordance with an embodiment of the present disclosure has a cylindrical outer surface 21 and a rotational axis 30
  • Outer surface 21 includes multiple circumferentially-alternating grooves 23 and lands 22 extending axially across the outer surface 21 of the pulpstone 20.
  • the lands 22 provide an active grinding surface area and the grooves 23 do not provide an active grinding surface area.
  • the abrasive can provide the active grits used during pulp manufacturing.
  • Abrasive bonding used to produce the pulpstone grinding matrix may be a vitrified bond or ceramic bond.
  • Each groove 23 is defined by a pair of sidewalls 25, 26 separated by a flat base surface 24.
  • each groove 23 has a flat bottom.
  • the shape of the groove 23 may be a truncated V-shaped groove wherein the sidewalls converge toward one another as they approach flat base 24, and flat base 24 eliminates the vertex of the V-shape.
  • sidewalls 25, 26 may be substantially orthogonal to flat base 24.
  • each land 22 is defined independently between its own associated sidewalls 25, 26, thereby improving wear characteristics of the lands 22.
  • the circumferential width of flat base 24 (or groove width g), may be in a range from approximately 2 mm through approximately 40 mm. Of course, other dimensions are possible and these are merely listed as examples.
  • the groove width g may be less than or equal to the separation distance s. In an instance, the groove width g can have a dimension that is equivalent to multiple average active grit diameters.
  • Distance d describes the radial depth dimension of groove 23 from the adjacent land 22 to the flat base 24 of the groove.
  • the distance d can be in a range from approximately 0.5 mm through approximately 8 mm, though other dimensions are possible.
  • Effective grinding area of the pulpstone is equal to the basic surface area of the cylindrical pulpstone minus the area removed by creating the grooves in the surface pattern.
  • Pulpstone grinding methods developed in 1843 remain relatively unchanged, except for increases in capacity and efficiency due to refinements in grinder design. It was expected that increasing land widths or groove widths would adversely affect pulp quality.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Crushing And Grinding (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Paper (AREA)

Abstract

Une meule de défibrage cylindrique a une surface externe qui comporte un abrasif. La surface externe définit une pluralité de creux et de méplats s'alternant de manière circonférentielle et s'étendant sur toute la surface externe de la meule de défibrage. Les méplats fournissent une zone active de meulage en surface tandis que les creux ne fournissent pas de zone active de meulage en surface. Chaque creux est défini par une paire de parois latérales séparées par une surface de base plane.
PCT/US2014/072736 2014-12-30 2014-12-30 Motif pour une meule de défibrage fournissant des caractéristiques d'usure améliorées WO2016108838A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/US2014/072736 WO2016108838A1 (fr) 2014-12-30 2014-12-30 Motif pour une meule de défibrage fournissant des caractéristiques d'usure améliorées

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/US2014/072736 WO2016108838A1 (fr) 2014-12-30 2014-12-30 Motif pour une meule de défibrage fournissant des caractéristiques d'usure améliorées

Publications (1)

Publication Number Publication Date
WO2016108838A1 true WO2016108838A1 (fr) 2016-07-07

Family

ID=52432924

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2014/072736 WO2016108838A1 (fr) 2014-12-30 2014-12-30 Motif pour une meule de défibrage fournissant des caractéristiques d'usure améliorées

Country Status (1)

Country Link
WO (1) WO2016108838A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2724222A (en) * 1953-08-04 1955-11-22 Norton Co Pulpstone
CA543998A (fr) * 1957-07-23 F. Beth Walter Meule de moulin
US3132815A (en) * 1961-07-24 1964-05-12 Karlstad Mekaniska Ab Grindstone for manufacture of wood pulp
DE9017091U1 (fr) * 1990-12-19 1991-05-08 Ebi, Manfred, 7618 Nordrach, De
US20030145842A1 (en) * 2002-01-31 2003-08-07 Karl-Heinz Steck Tool for dressing pulpstones

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA543998A (fr) * 1957-07-23 F. Beth Walter Meule de moulin
US2724222A (en) * 1953-08-04 1955-11-22 Norton Co Pulpstone
US3132815A (en) * 1961-07-24 1964-05-12 Karlstad Mekaniska Ab Grindstone for manufacture of wood pulp
DE9017091U1 (fr) * 1990-12-19 1991-05-08 Ebi, Manfred, 7618 Nordrach, De
US20030145842A1 (en) * 2002-01-31 2003-08-07 Karl-Heinz Steck Tool for dressing pulpstones

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