US20070174990A1 - Keep for doctor blade holder - Google Patents
Keep for doctor blade holder Download PDFInfo
- Publication number
- US20070174990A1 US20070174990A1 US11/627,440 US62744007A US2007174990A1 US 20070174990 A1 US20070174990 A1 US 20070174990A1 US 62744007 A US62744007 A US 62744007A US 2007174990 A1 US2007174990 A1 US 2007174990A1
- Authority
- US
- United States
- Prior art keywords
- keep
- top plate
- doctor blade
- slot opening
- thermoplastic material
- 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
Links
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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 papermaking 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.
- 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 not reusable.
- 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.
- FIG. 1 is a side view of a doctoring apparatus, with a keep in accordance with the present invention included in the doctor blade holder;
- FIG. 2 is a top perspective view of the keep
- FIG. 3 is a bottom perspective view of the keep
- FIGS. 4 , 5 , 6 , and 7 are top, front, bottom, and side views respectively of the keep.
- FIG. 8 is an enlarged partially sectioned view of the keep attached to the top plate.
- 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 A 1
- 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 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), polyphenylene sulfide (PPS), polyphthalamide (PPA), polyvinyl chloride (PVC), polyethylene (PE) and polypropylene (PP).
- 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 nm to about 1 mm, and preferably may have a diameter of between about 10 nm and about 100 nm.
- the keep 22 comprises a base 34 grooved along its rear edge at 36 , with a forwardly projecting ledge 38 having an upturned lip 40 .
- 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 44 in the bottom surface of the base 34 .
- 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 FIG. 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 keep also provides that 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 in 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
Description
- This application claims priority to U.S. Provisional Patent Application Ser. No. 60/763,518 filed on Jan. 31, 2006.
- 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. For example, doctor blades in papermaking machines are generally employed to remove accumulated debris from a roll in the papermaking machine. In certain systems, 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. Typically, 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 not reusable.
- The casting process is labor intensive and therefore quite expensive. Since a typical blade holder requires many keeps (often several hundred), the total cost of the keeps amounts to a very significant percentage of the holder cost. Stainless steel is also difficult and costly to machine. Each keep requires the machining of two tapped holes that receives screws used to mount the keep to the top plate. This operation further adds cost to the already expensive part.
- 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.
- In accordance with an embodiment, 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.
- In accordance with another embodiment, 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.
- In accordance with a further embodiment, 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.
- The following description may be further understood with reference to the accompanying drawings in which:
-
FIG. 1 is a side view of a doctoring apparatus, with a keep in accordance with the present invention included in the doctor blade holder; -
FIG. 2 is a top perspective view of the keep; -
FIG. 3 is a bottom perspective view of the keep; -
FIGS. 4 , 5, 6, and 7 are top, front, bottom, and side views respectively of the keep; and -
FIG. 8 is an enlarged partially sectioned view of the keep attached to the top plate. - The drawings are shown for illustrative purposes only and are not to scale.
- Applicants have discovered that a 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.
- With reference initially to
FIG. 1 , adoctoring apparatus 10 is shown adjacent to the surface of aroll 12. The roll rotates about an axis A1, and the doctoring apparatus includes adoctor back 14 that is rotatable about an axis A2 that is parallel to the axis A1. A doctor blade holder 16 is shown supported on abeam 18 forming part of the doctor back. The holder is formed of a generally conventional design, having atop plate 20 mounted for pivotal movement about an axis A3. A plurality of keeps 22 in accordance with the present invention are spaced along the underside of thetop plate 20. The keeps 22 coact with thetop plate 20 to define slots receiving the rear edge of adoctor 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 theroll 12 to effect doctoring. Thetop plate 20 is pivoted about axis A3 by means of inflatable loading and unloadingtubes 26, 28 in a manner that is well known to those skilled in the art. A piston/cylinder unit 30 acts via acrank arm 32 to rotate the doctor back 14 about axis A2 in order to load theblade 24 against the roll surface. - The
keep 22 is a one piece component that is molded from a variety of thermoplastics including engineered thermoplastic materials. Such engineered plastics include, but are not limited to polyetheretherketone (PEEK), polyphenylene sulfide (PPS), polyphthalamide (PPA), polyvinyl chloride (PVC), polyethylene (PE) and polypropylene (PP). - PPA, as a base resin, combines excellent chemical and thermal resistance. When used in combination with fiber reinforcement, the mechanical properties are greatly enhanced in a variety of environments. 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. In further embodiments 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 nm to about 1 mm, and preferably may have a diameter of between about 10 nm and about 100 nm.
- With reference additionally to
FIGS. 2-7 , it will be seen that thekeep 22 comprises abase 34 grooved along its rear edge at 36, with a forwardly projectingledge 38 having anupturned lip 40. The top surface of the base forms an elongated boss having throughholes 42 at the opposite ends thereof. Eachhole 42 leads to ahexagonal recess 44 in the bottom surface of thebase 34. Thehexagonal 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. Thehexagonal 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. For example, mutually spaced parallel strengthening gussets or
ribs 46 are located between therecesses 44 and extend rearwardly from theledge 38 along the underside of thebase 34. The gussets provide additional structural rigidity. The relief features also include at least onecavity 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 inFIG. 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 keep also provides that 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 plateflat 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. - As shown in
FIG. 8 , thekeep 22 is attached to the underside of thetop plate 24 by means of a pair of screws 48 (only one being shown) and coacting hexagonal nuts 50. Thescrews 48 project downwardly through holes in the top plate and theholes 42 in the keep for threaded engagement with the nuts, the latter being received in and rotatably fixed in the hexagonal recesses 44. - With this arrangement, there is no need to drill and tap holes in the keep. The use of mass produced threaded nuts as an alternate to a machining operation further reduces cost.
- 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. - Those skilled in the art will appreciate that numerous modifications and variations may be made to the above disclosed embodiments without departing from the spirit and scope of the invention.
Claims (22)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/627,440 US20070174990A1 (en) | 2006-01-31 | 2007-01-26 | Keep for doctor blade holder |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US76351806P | 2006-01-31 | 2006-01-31 | |
US11/627,440 US20070174990A1 (en) | 2006-01-31 | 2007-01-26 | Keep for doctor blade holder |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070174990A1 true US20070174990A1 (en) | 2007-08-02 |
Family
ID=37964752
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/627,440 Abandoned US20070174990A1 (en) | 2006-01-31 | 2007-01-26 | Keep for doctor blade holder |
Country Status (2)
Country | Link |
---|---|
US (1) | US20070174990A1 (en) |
WO (1) | WO2007090045A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US11130294B2 (en) * | 2012-03-23 | 2021-09-28 | Cutting Dynamics, Inc. | Injection molded composite blank and guide |
US20220009174A1 (en) * | 2012-03-23 | 2022-01-13 | Cutting Dynamics, Inc. | Injection molded composite blank and guide |
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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 |
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 |
US3040442A (en) * | 1959-04-27 | 1962-06-26 | Lyle S Overton | Blade assembly for drum dryers or the like |
US3593663A (en) * | 1969-06-03 | 1971-07-20 | Zerand Corp | Doctor blade assembly for printing equipment |
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 |
US3748686A (en) * | 1970-06-06 | 1973-07-31 | 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 |
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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 |
US4542554A (en) * | 1984-05-15 | 1985-09-24 | Wallerstein Martin A | Low cost, renewable scraping implement |
US4665859A (en) * | 1985-12-11 | 1987-05-19 | Thermo Electron-Web Systems, Inc. | Finger-type doctor blade holder |
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US4821672A (en) * | 1987-06-22 | 1989-04-18 | Nick Bruno | Doctor blade assembly with rotary end seals and interchangeable heads |
US4906335A (en) * | 1987-06-08 | 1990-03-06 | Thermo Electron Web System, Inc. | Doctoring apparatus |
US5070783A (en) * | 1990-05-18 | 1991-12-10 | Ireton Carl A | Adjustable doctor blade mounting means |
US5279710A (en) * | 1988-11-16 | 1994-01-18 | Aikawa Iron Works, Co., Ltd. | Doctor blade supporting structure |
US5284516A (en) * | 1991-08-07 | 1994-02-08 | J. M. Voith Gmbh | Doctoring apparatus with flexible blade mounting |
US5389151A (en) * | 1993-03-15 | 1995-02-14 | Nordson Corporation | Interchangeable contact/non-contact dispensing system |
US5406887A (en) * | 1993-01-15 | 1995-04-18 | Paper Converting Machine Company | Apparatus and method for doctor blade replacement in a flexographic press |
US5408720A (en) * | 1992-04-10 | 1995-04-25 | Vickerys Limited | Mounting assembly for a scraper blade |
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JP3598787B2 (en) * | 1997-12-17 | 2004-12-08 | 三菱化学株式会社 | Doctor blade holder |
FIU20010246U0 (en) * | 2001-06-15 | 2001-06-15 | Metso Paper Inc | Arrangement for scraping a belt of a paper or board machine or a soft roll cover |
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2007
- 2007-01-26 WO PCT/US2007/061102 patent/WO2007090045A1/en active Application Filing
- 2007-01-26 US US11/627,440 patent/US20070174990A1/en not_active Abandoned
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Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
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 |
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 |
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 |
US3748686A (en) * | 1970-06-06 | 1973-07-31 | Winterburn Ltd Joseph | Roll doctor apparatus |
US3803665A (en) * | 1972-01-01 | 1974-04-16 | 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 |
US4542554A (en) * | 1984-05-15 | 1985-09-24 | Wallerstein Martin A | Low cost, renewable scraping implement |
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 |
US5279710A (en) * | 1988-11-16 | 1994-01-18 | Aikawa Iron Works, Co., Ltd. | Doctor blade supporting structure |
US5070783A (en) * | 1990-05-18 | 1991-12-10 | Ireton Carl A | Adjustable doctor blade mounting means |
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US11130294B2 (en) * | 2012-03-23 | 2021-09-28 | Cutting Dynamics, Inc. | Injection molded composite blank and guide |
US20220009174A1 (en) * | 2012-03-23 | 2022-01-13 | Cutting Dynamics, Inc. | Injection molded composite blank and guide |
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