WO2007090045A1 - Garde pour porte-bistouri - Google Patents

Garde pour porte-bistouri Download PDF

Info

Publication number
WO2007090045A1
WO2007090045A1 PCT/US2007/061102 US2007061102W WO2007090045A1 WO 2007090045 A1 WO2007090045 A1 WO 2007090045A1 US 2007061102 W US2007061102 W US 2007061102W WO 2007090045 A1 WO2007090045 A1 WO 2007090045A1
Authority
WO
WIPO (PCT)
Prior art keywords
keep
top plate
doctor blade
slot opening
thermoplastic material
Prior art date
Application number
PCT/US2007/061102
Other languages
English (en)
Inventor
Michael Dejesus
Robert Reid
David Gardiner
Christopher Borradaile
Original Assignee
Kadant 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 Kadant Inc. filed Critical Kadant Inc.
Publication of WO2007090045A1 publication Critical patent/WO2007090045A1/fr

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C11/00—Component parts, details or accessories not specifically provided for in groups B05C1/00 - B05C9/00
    • B05C11/02—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface
    • B05C11/04—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades
    • B05C11/044—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface ; Controlling means therefor; Control of the thickness of a coating by spreading or distributing liquids or other fluent materials already applied to the coated surface with blades characterised by means for holding the blades
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/005—Doctor knifes

Definitions

  • This invention relates generally to doctor blade holders, and is concerned in particular with improved mounting structures (or keeps) for such holders.
  • a doctor blade holder generally holds a doctor blade in a desired position with respect to a rotating roll in a manufacturing process.
  • doctor blades in papeimaldng machines are generally employed to remove accumulated debris from a roll in the papermaking machine.
  • the doctor blade may further be employed to shed a portion of a sheet of paper.
  • Many such roll cleaning and sheet shedding applications in paper machines and other web handling applications involve blade support devices that are commonly referred to as doctor blade holders.
  • a doctor blade holder is mounted on a heavy-duty beam, and includes a top plate with a mounting structure called a keep along its underside. Each keep coacts with the top plate to define a slot, and the rear edge of a doctor blade is received in the slot of each keep.
  • the doctor blade then becomes captured between the top plate and the keeps.
  • the doctoring process often involves exposing the blade holder to high steady- state loads in combination with impact loads. It is imperative that holder components, including the keeps, be of robust design so as to safely accommodate such conditions. In addition to the mechanical loading, the blade holder may be exposed to a wide range of caustic chemicals and high operating temperatures. For this reason, the selection of appropriate materials is of the utmost importance and often involves the use of very expensive corrosion resistant metals such as type 316 Stainless Steel.
  • the metal keeps are conventionally produced by a process known, as investment casting whereby molten stainless steel is poured into a ceramic mold. After solidification of the stainless steel, the ceramic mold is broken apart to remove the keep. The mold is
  • An objective of the present invention is to provide an improved keep design that addresses the major issues of structural integrity, chemical resistance, and hi-temperature endurance.
  • the invention provides an injection molded keep that includes a thermoplastic material and a reinforcement material.
  • the keep is positioned adjacent a top plate in a doctor blade holding apparatus and provides a slot opening between the keep and the top plate for receiving an end of a doctor blade in the slot opening.
  • the invention provides an injection molded thermoplastic keep that is positioned adjacent a top plate in a doctor blade holding apparatus and provides a slot opening between the keep and the top plate for receiving an end of a doctor blade in the slot opening.
  • the keep includes a thermoplastic material and relief features in the thermoplastic keep.
  • the relief features include at least one gusset that provides additional structural rigidity, at least one cavity that is positioned to provide a more uniform cross-sectional area that would exist on the keep without the cavity, and a relieve in a surface for providing that a portion of the keep adjacent a fastening screw hole maintains contact with the top plate when the keep is secured to the top plate.
  • the invention provides an injection molded thermoplastic keep that is positioned adjacent a top plate in a doctor blade holding apparatus and provides a slot opening between the keep and the top plate for receiving an end of a doctor blade in the slot opening.
  • the keep includes a nut retaining and anti-rotation cavity for receiving a nut that may be fastened to a screw that passes through the top plate.
  • Figure 1 is a side view of a doctoring apparatus, with a keep in accordance with the present invention included in the doctor blade holder;
  • Figure 2 is a top perspective view of the keep
  • Figure 3 is a bottom perspective view of the keep
  • Figures 4, 5, 6, and 7 are top, front, bottom, and side views respectively of the keep.
  • Figure 8 is an enlarged partially sectioned view of the keep attached to the top
  • thermoplastic material may be formed by an injection molding process that is suitable for use in securing a doctor blade to a top plate in accordance with various embodiments of the invention.
  • a doctoring apparatus 10 is shown adjacent to the surface of a roll 12. The roll rotates about an axis Ai, and the doctoring apparatus includes a doctor back 14 that is rotatable about an axis A 2 that is parallel to the axis A 1 .
  • a doctor blade holder 16 is shown supported on a beam 18 forming part of the doctor back.
  • the holder is formed of a generally conventional design, having a top plate 20 mounted for pivotal movement about an axis A 3 .
  • a plurality of keeps 22 in accordance with the present invention are spaced along the underside of the top plate 20.
  • the keeps 22 coact with the top plate 20 to define slots receiving the rear edge of a doctor blade 24.
  • the rear edge of the doctor blade is captured between the top plate and the keeps, and its forward edge is applied to the surface of the roll 12 to effect doctoring.
  • the top plate 20 is pivoted about axis A 3 by means of inflatable loading and unloading tubes 26, 28 in a manner that is well known to those skilled in the art.
  • a piston/cylinder unit 30 acts via a crank arm 32 to rotate the doctor back 14 about axis A 2 in order to load the blade 24 i against the roll surface.
  • the keep 22 is a one piece component that is molded from a variety of thermoplastics including engineered thermoplastic materials.
  • engineered plastics include, but are not limited to polyetheretherketone (PEEK), polyplienylene sulfide
  • PPS polyphthalamide
  • PVC polyvinyl chloride
  • PE polyethylene
  • PP polypropylene
  • a preferred reinforcement is discontinuous carbon fiber wherein the term discontinuous refers to the size of fibers relative to the keep.
  • the small fibers may be injection molded resulting in random orientation. This random orientation leads to isotropic properties.
  • the fibers may be formed of glass, carbon, aramid, ceramic and thermoplastic material.
  • the fibers may be between about 0.25 mm and about 15 mm, and may preferably be between about 0.5 mm and about 3 mm in length.
  • Other potential reinforcement materials may include non-fiber elements formed of glass, ceramic, or plastic as well in continuous or discontinuous size distributions.
  • the reinforcement material may include a plurality of particles that are formed of glass, silicon carbide and calcium carbide, and may have a diameter of between about 1 ⁇ m to about 1 mm, and. preferably may have a diameter of between about 10 ⁇ m and about 100 nni.
  • the keep 22 comprises a base 34 grooved along its rear edge at 36, with a forwardly projecting ledge
  • the top surface of the base forms an elongated boss having through holes 42 at the opposite ends thereof. Each hole 42 leads to a hexagonal recess
  • the hexagonal recess 44 provides a nut-retaining recess for receiving a nut that engages a screw that passes through the top plate.
  • the nut may be adhered to the keep within the recess or may be received within the recess in a snap-fit arrangement in various embodiments.
  • the hexagonal recess 44 also provides an anti-rotation recess that prevents the nut from rotating when screw is rotated.
  • the keep also includes a plurality of engineered relief features.
  • mutually spaced parallel strengthening gussets or ribs 46 are located between the recesses 44 and extend rearwardly from the ledge 38 along the underside of the base 34.
  • the gussets provide additional structural rigidity.
  • the relief features also include at least one cavity 52 that is positioned to provide a more uniform cross-sectional area that would exist on the keep without the cavity, and a relieve 54 (as also shown in Figure 5) in a surface for providing that a portion of the keep adjacent a fastening screw hole maintains contact with the top plate when the keep is secured to the top plate.
  • the slot opening is partially defined by a slot flat portion 56 that has a flatness tolerance of at least 0.250 inches per inch.
  • the keep further provides a top plate flat portion 58 that contacts the tope plate, and the top plate flat portion has a flatness tolerance of at least 0.250 inches per inch.
  • the keep 22 is attached to the underside of the top plate 24 by means of a pair of screws 48 (only one being shown) and coacting hexagonal nuts 50.
  • the screws 48 project downwardly through holes in the top plate and the holes 42 in the keep for threaded engagement with the nuts, the latter being received in and rotatably fixed hi the hexagonal recesses 44.
  • the nuts 50 are prevented from rotating by the matching molded recesses 44 in the keep. Thus, when the two screws are tightened, there is no need to use a wrench to hold the nuts at the underside of the keep. This simplifies the assembly operation further reducing the overall cost of the blade holder.

Landscapes

  • Paper (AREA)

Abstract

L'invention concerne une garde (22) moulée par injection qui comprend un matériau thermoplastique et un matériau de renforcement. La garde est disposée de façon adjacente à une plaque de dessus (20) d'un appareil porteur de bistouri (24) et présente une ouverture en fente entre la garde et la plaque de dessus, pour accueillir une extrémité d'un bistouri dans l'ouverture en fente.
PCT/US2007/061102 2006-01-31 2007-01-26 Garde pour porte-bistouri WO2007090045A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US76351806P 2006-01-31 2006-01-31
US60/763,518 2006-01-31

Publications (1)

Publication Number Publication Date
WO2007090045A1 true WO2007090045A1 (fr) 2007-08-09

Family

ID=37964752

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/061102 WO2007090045A1 (fr) 2006-01-31 2007-01-26 Garde pour porte-bistouri

Country Status (2)

Country Link
US (1) US20070174990A1 (fr)
WO (1) WO2007090045A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013142774A1 (fr) * 2012-03-23 2013-09-26 Cutting Dynamics, Inc. Ébauche composite renforcée par des fibres moulées à orifice de guidage
US20220009174A1 (en) * 2012-03-23 2022-01-13 Cutting Dynamics, Inc. Injection molded composite blank and guide

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB742882A (en) * 1953-02-18 1956-01-04 Richmond W Smith Improvements in doctors for paper and like machines
DE1055351B (de) * 1956-01-13 1959-04-16 Vickerys Ltd Walzenschaber, insbesondere fuer Papiermaschinen
US2890473A (en) * 1954-12-14 1959-06-16 Vickerys Ltd Doctors for paper and like machines
US2948012A (en) * 1956-01-13 1960-08-09 Vickerys Ltd Doctors for paper-making and other machines
GB990670A (en) * 1963-12-13 1965-04-28 Lodding Engineering Corp Adjustable doctor blade holder
US4542554A (en) * 1984-05-15 1985-09-24 Wallerstein Martin A Low cost, renewable scraping implement
US5279710A (en) * 1988-11-16 1994-01-18 Aikawa Iron Works, Co., Ltd. Doctor blade supporting structure
JPH11170478A (ja) * 1997-12-17 1999-06-29 Mitsubishi Chemical Corp ドクターブレードホルダー
WO1999064674A1 (fr) * 1998-06-09 1999-12-16 Valmet Corporation Racle et support de racle comprenant un materiau composite et un revetement ceramique
WO2000044981A1 (fr) * 1999-01-29 2000-08-03 Thermo Web Systems, Inc. Ensemble montage de racle
DE10225399A1 (de) * 2001-06-15 2002-12-19 Metso Paper Inc Anordnung zum Schaben eines Bandes oder eines weichen Walzenbezugs in Papier- oder Kartonmaschinen

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US1696119A (en) * 1927-03-07 1928-12-18 Mead Pulp & Paper Company Paper machinery
US1912605A (en) * 1930-07-31 1933-06-06 Vickery Inc Doctor for paper-making and like machines
US2287350A (en) * 1938-11-08 1942-06-23 Frederick W Lodding Doctor mechanism for rolls and cylinders
US2487409A (en) * 1945-12-21 1949-11-08 Vickerys Ltd Doctor blade and mounting
US3040442A (en) * 1959-04-27 1962-06-26 Lyle S Overton Blade assembly for drum dryers or the like
US3596305A (en) * 1967-05-25 1971-08-03 Vickerys Ltd Doctors for paper making and like machines
US3645844A (en) * 1968-04-22 1972-02-29 Lodding Engineering Corp Mounting means for foil type and similar elements
US3593663A (en) * 1969-06-03 1971-07-20 Zerand Corp Doctor blade assembly for printing equipment
GB1309804A (en) * 1970-06-06 1973-03-14 Winterburn Ltd Joseph Roll doctor apparatus
GB1416161A (en) * 1972-01-01 1975-12-03 Winterburn Ltd Joseph Roll doctor apparatus
US3778861A (en) * 1972-06-26 1973-12-18 Lodding Engineering Corp Bladeholders for doctors and scrapers
US3780670A (en) * 1972-08-07 1973-12-25 Faustel Inc Doctor blade assembly
US3854162A (en) * 1973-03-02 1974-12-17 Bird Machine Co Doctor blade holder
US3866266A (en) * 1973-11-09 1975-02-18 Lodding Engineering Corp Self-adjusting doctor blades
US4241691A (en) * 1978-08-30 1980-12-30 Monsanto Company Doctor blade holder
US4367120A (en) * 1980-03-13 1983-01-04 Vickerys Limited Doctor blade mounting assembly
US4459176A (en) * 1982-11-12 1984-07-10 Thermo Electron Corporation Dewatering system with adjustable width suction slots
US4665859A (en) * 1985-12-11 1987-05-19 Thermo Electron-Web Systems, Inc. Finger-type doctor blade holder
US4906335A (en) * 1987-06-08 1990-03-06 Thermo Electron Web System, Inc. Doctoring apparatus
US4789432A (en) * 1987-06-08 1988-12-06 Thermo Electron Web Systems, Inc. Doctoring apparatus
US4821672A (en) * 1987-06-22 1989-04-18 Nick Bruno Doctor blade assembly with rotary end seals and interchangeable heads
US5070783A (en) * 1990-05-18 1991-12-10 Ireton Carl A Adjustable doctor blade mounting means
DE9109785U1 (fr) * 1991-08-07 1992-09-17 J.M. Voith Gmbh, 7920 Heidenheim, De
GB9208003D0 (en) * 1992-04-10 1992-05-27 Vickerys Ltd A mounting assembly
US5406887A (en) * 1993-01-15 1995-04-18 Paper Converting Machine Company Apparatus and method for doctor blade replacement in a flexographic press
US5389151A (en) * 1993-03-15 1995-02-14 Nordson Corporation Interchangeable contact/non-contact dispensing system
US6312563B1 (en) * 1997-12-22 2001-11-06 Thermo Web Systems, Inc. Removable doctor blade holder
US5980692A (en) * 1997-12-22 1999-11-09 Thermo Web Systems, Inc. Removable doctor blade holder
US6139638A (en) * 1998-01-27 2000-10-31 Thermo Web Systems, Inc. Fluid assisted doctor
US6360660B1 (en) * 1998-11-25 2002-03-26 Allison Tech Sales Incorporated Doctor blade systems
FI105577B (fi) * 1999-02-03 2000-09-15 Valmet Corp Paperikoneen kaavinlaitteisto
US6491754B1 (en) * 2000-06-13 2002-12-10 Voith Sulzer Paper Technology North America, Inc. Carbon fiber doctor blade
US6786999B2 (en) * 2001-04-18 2004-09-07 Kadant Web Systems, Inc. Doctor blade holder
US6524444B2 (en) * 2001-04-24 2003-02-25 Kadant Web Systems Inc. Removable doctor blade holder
US6942734B2 (en) * 2003-02-20 2005-09-13 Metso Paper, Inc. Treatment equipment

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB742882A (en) * 1953-02-18 1956-01-04 Richmond W Smith Improvements in doctors for paper and like machines
US2890473A (en) * 1954-12-14 1959-06-16 Vickerys Ltd Doctors for paper and like machines
DE1055351B (de) * 1956-01-13 1959-04-16 Vickerys Ltd Walzenschaber, insbesondere fuer Papiermaschinen
US2948012A (en) * 1956-01-13 1960-08-09 Vickerys Ltd Doctors for paper-making and other machines
GB990670A (en) * 1963-12-13 1965-04-28 Lodding Engineering Corp Adjustable doctor blade holder
US4542554A (en) * 1984-05-15 1985-09-24 Wallerstein Martin A Low cost, renewable scraping implement
US5279710A (en) * 1988-11-16 1994-01-18 Aikawa Iron Works, Co., Ltd. Doctor blade supporting structure
JPH11170478A (ja) * 1997-12-17 1999-06-29 Mitsubishi Chemical Corp ドクターブレードホルダー
WO1999064674A1 (fr) * 1998-06-09 1999-12-16 Valmet Corporation Racle et support de racle comprenant un materiau composite et un revetement ceramique
WO2000044981A1 (fr) * 1999-01-29 2000-08-03 Thermo Web Systems, Inc. Ensemble montage de racle
DE10225399A1 (de) * 2001-06-15 2002-12-19 Metso Paper Inc Anordnung zum Schaben eines Bandes oder eines weichen Walzenbezugs in Papier- oder Kartonmaschinen

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