US3356067A - Doctor blades having relieved ends - Google Patents

Doctor blades having relieved ends Download PDF

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Publication number
US3356067A
US3356067A US579310A US57931066A US3356067A US 3356067 A US3356067 A US 3356067A US 579310 A US579310 A US 579310A US 57931066 A US57931066 A US 57931066A US 3356067 A US3356067 A US 3356067A
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US
United States
Prior art keywords
blade
areas
blades
doctor
doctor blade
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.)
Expired - Lifetime
Application number
US579310A
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English (en)
Inventor
Leonard L Krasnow
Marshall S Green
Costello Edward
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.)
Lodding Engineering Corp
Original Assignee
Lodding Engineering Corp
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 Lodding Engineering Corp filed Critical Lodding Engineering Corp
Priority to US579310A priority Critical patent/US3356067A/en
Priority to GB40670/67A priority patent/GB1173633A/en
Priority to DE1696226A priority patent/DE1696226C3/de
Priority to SE12622/67A priority patent/SE320619B/xx
Priority to FR1567894D priority patent/FR1567894A/fr
Application granted granted Critical
Publication of US3356067A publication Critical patent/US3356067A/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
    • D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G3/00—Doctors
    • D21G3/005—Doctor knifes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
    • B31F1/00—Mechanical deformation without removing material, e.g. in combination with laminating
    • B31F1/12—Crêping
    • B31F1/14—Crêping by doctor blades arranged crosswise to the web
    • B31F1/145—Blade constructions

Definitions

  • the areas of greater flexibility are made by reducing material by grinding a relief in the end portions of the blade to reduce the pressure at those points; slotting the blades, punching or in general removing material; or Without removing material weakening the blades at these points in order to cause them to flex more greatly when in contact with the rolls. In cases where material is actual ly removed, it is a simple matter to coat or cover the removed areas or apertures with plastic, tape, rubber, etc. in order to prevent flow of liquids therethrough.
  • FIG. 1 is a view in section illustrating a ground relife at the compression side of the blade
  • FIG. 2 is a similar view illustrating a ground relief at the tension side of the blade
  • FIG. 3 is a view on an enlarged scale illustrating the areas of the ground reliefs
  • FIG. 4 shows a modification
  • FIG. 5 is a section on line 55 of FIG. 4;
  • FIGS. 6 and 7 show other forms of the new blade
  • FIG. 8 is a section through a blade having reliefs at 'both sides.
  • FIG. 1 there is shown a type of blade holder well known in the art as a Beloit type holder.
  • This holder holds the doctor blade 10 in position between the jaws 12 and 14.
  • the blade of course is provided with a beveled edge 16 and the present invention envisions a reduction of blade material by a score or ground relief in the area at 18 which provides that in this area of the blade the beveled edge portion thereof 3,356,667 Patented Dec. 5, 1967 will flex more readily.
  • the areas of greater flexibility are arranged in the overhang, i.e., the non-operating area of the blade, and therefore it does not pass with as much force against the roll in those areas. Therefore the roll will not wear to an appreciable extent in those areas.
  • the areas of reduced material and increase flexibility are adjacent the beveled edge, in the area of the blade which is not held in the blade holder.
  • This blade is also shown on a reduced scale in FIG. 3 illustrating the approximate positions of the reliefs or scores in the areas at 18. The part of the blade between these areas is the operating portion of the blade where the web is located.
  • the depth of the score will depend upon the degree of flex which is desired and may vary from a thousandth of an inch to several thousandths. Of course it also depends upon the thickness of the blade, etc. In most cases it will be positioned parallel to and adjacent to the beveled edge 15 but this is not necessarily the case, as in most instances the blade must be designed for the particular job it is to accomplish. Also, by properly tapering the score, so as to remove less and less material from the blade end to the operating section, a transitional change in pressure is provided in this direction.
  • FIG. 1 the relief 18 is illustrated as at the compression side of the blade, but in some cases it is desirable to place the relief at the tension side, as in FIG. 2, which illustrates the blade in a different type of holder.
  • Holes can be punched out in a line as indicated at 20 in FIG. 4 and then the holes may be covered with tape, plastic or rubber in order to prevent fluid flow, see particularly FIG. 5, the tape or plastic, etc. being indicated at 22.
  • FIGS. 6 and 7 show mere slits provided in the blade.
  • the straight slit at 24 can be provided to weaken the area of the blade under consideration; or as in FIG. 7, the tabs 26 may be actually punched and then moved back into the plane of the blade and in this way even though the slits are present, there are no openings for the passage of fluids therethrough, the tabs completely closing these areas.
  • scores or relief grinds can be applied at both sides of the blades as indicated at 28 and 30 in FIG. 8.
  • An elongated doctor blade of generally uniform thickness having a length many times its thickness and a width several times its thickness, one of the elongated edges of the blade being a working edge adapted to engage a coating material to smooth it over a surface, the opposite edge portion of the blade being adapted to be held in a doctor blade holder, thus providing a generally free working portion of the blade which extends beyond the holder, the latter being generally parallel with respect to said blade,
  • doctor blade having areas of reduced material adjacent the opposite end portions and in the free working portion thereof increasing the flexibility of the blade in generally restricted areas adjacent the free working edge portion, at said end portions.
  • doctor blade of claim 1 wherein material includes scalloped slits extending blade.
  • doctor blade of claim 1 wherein material is in the form of scores.
  • doctor blade of claim 1 wherein material is in the form of scores parallel to edge.
  • doctor blade of claim 1 wherein said reduced material is in the form of scores appearing at opposite sides of the blade in the same general area.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
US579310A 1966-09-14 1966-09-14 Doctor blades having relieved ends Expired - Lifetime US3356067A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US579310A US3356067A (en) 1966-09-14 1966-09-14 Doctor blades having relieved ends
GB40670/67A GB1173633A (en) 1966-09-14 1967-09-06 An Improved Doctor Blade for Use in Paper Making Machines.
DE1696226A DE1696226C3 (de) 1966-09-14 1967-09-12 Abstreifmesser für Papierherstellungsanlagen
SE12622/67A SE320619B (xx) 1966-09-14 1967-09-13
FR1567894D FR1567894A (xx) 1966-09-14 1967-09-14

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US579310A US3356067A (en) 1966-09-14 1966-09-14 Doctor blades having relieved ends

Publications (1)

Publication Number Publication Date
US3356067A true US3356067A (en) 1967-12-05

Family

ID=24316386

Family Applications (1)

Application Number Title Priority Date Filing Date
US579310A Expired - Lifetime US3356067A (en) 1966-09-14 1966-09-14 Doctor blades having relieved ends

Country Status (5)

Country Link
US (1) US3356067A (xx)
DE (1) DE1696226C3 (xx)
FR (1) FR1567894A (xx)
GB (1) GB1173633A (xx)
SE (1) SE320619B (xx)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3611841A (en) * 1967-11-07 1971-10-12 Uddeholms Ab Method of producing a coating doctor
US3850099A (en) * 1973-10-24 1974-11-26 Dick Co Ab Washing roller and wiper blade mechanism for duplicating machines
US3855927A (en) * 1972-06-13 1974-12-24 Roland Offsetmaschf Ink fountain blade for printing presses
US3872828A (en) * 1971-12-17 1975-03-25 Agfa Gevaert Ag Xerographic copying apparatus with intercepting means for carrier particles
US3895575A (en) * 1972-06-21 1975-07-22 Roland Offsetmaschf Metering bar assembly for ink fountain roller
US4031252A (en) * 1976-03-10 1977-06-21 The United States Of America As Represented By The Secretary Of Agriculture Doctoring and drying method
US4676160A (en) * 1985-07-18 1987-06-30 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Doctor blade for use in an inker of a printing machine
US5110415A (en) * 1990-04-23 1992-05-05 Albany International Corp. Composite doctor blade assembly for pulp or papermaking machine doctors
US5284516A (en) * 1991-08-07 1994-02-08 J. M. Voith Gmbh Doctoring apparatus with flexible blade mounting
US5846325A (en) * 1997-02-25 1998-12-08 The Mead Corporation Coating blade and method of using the same
US5940925A (en) * 1996-10-12 1999-08-24 Rieter Ingolstadt Spinnereimaschinenbau Ag Cleaning lip device for a rotating roll of a textile machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4120141C2 (de) * 1991-06-19 1995-06-08 Voith Gmbh J M Streichklinge

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT197512B (de) * 1957-03-02 1958-05-10 Ludwig Hoffenreich & Sohn Vorrichtung zum Auftragen von fließfähigen, zähflüssigen oder plastischen Massen
GB1015565A (en) * 1963-08-28 1966-01-05 Miag Muehlenbau & Ind Gmbh Device for scraping rollers

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT197512B (de) * 1957-03-02 1958-05-10 Ludwig Hoffenreich & Sohn Vorrichtung zum Auftragen von fließfähigen, zähflüssigen oder plastischen Massen
GB1015565A (en) * 1963-08-28 1966-01-05 Miag Muehlenbau & Ind Gmbh Device for scraping rollers

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3611841A (en) * 1967-11-07 1971-10-12 Uddeholms Ab Method of producing a coating doctor
US3872828A (en) * 1971-12-17 1975-03-25 Agfa Gevaert Ag Xerographic copying apparatus with intercepting means for carrier particles
US3855927A (en) * 1972-06-13 1974-12-24 Roland Offsetmaschf Ink fountain blade for printing presses
US3895575A (en) * 1972-06-21 1975-07-22 Roland Offsetmaschf Metering bar assembly for ink fountain roller
US3850099A (en) * 1973-10-24 1974-11-26 Dick Co Ab Washing roller and wiper blade mechanism for duplicating machines
US4031252A (en) * 1976-03-10 1977-06-21 The United States Of America As Represented By The Secretary Of Agriculture Doctoring and drying method
US4676160A (en) * 1985-07-18 1987-06-30 M.A.N.-Roland Druckmaschinen Aktiengesellschaft Doctor blade for use in an inker of a printing machine
US5110415A (en) * 1990-04-23 1992-05-05 Albany International Corp. Composite doctor blade assembly for pulp or papermaking machine doctors
US5284516A (en) * 1991-08-07 1994-02-08 J. M. Voith Gmbh Doctoring apparatus with flexible blade mounting
US5940925A (en) * 1996-10-12 1999-08-24 Rieter Ingolstadt Spinnereimaschinenbau Ag Cleaning lip device for a rotating roll of a textile machine
US5846325A (en) * 1997-02-25 1998-12-08 The Mead Corporation Coating blade and method of using the same

Also Published As

Publication number Publication date
DE1696226C3 (de) 1974-03-28
DE1696226B2 (de) 1973-08-16
DE1696226A1 (de) 1971-12-30
SE320619B (xx) 1970-02-09
FR1567894A (xx) 1969-05-23
GB1173633A (en) 1969-12-10

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