WO2024141386A1 - Racle composite - Google Patents

Racle composite Download PDF

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Publication number
WO2024141386A1
WO2024141386A1 PCT/EP2023/087083 EP2023087083W WO2024141386A1 WO 2024141386 A1 WO2024141386 A1 WO 2024141386A1 EP 2023087083 W EP2023087083 W EP 2023087083W WO 2024141386 A1 WO2024141386 A1 WO 2024141386A1
Authority
WO
WIPO (PCT)
Prior art keywords
blade
substrate
blade substrate
equal
major surface
Prior art date
Application number
PCT/EP2023/087083
Other languages
English (en)
Inventor
Bartek KAPLAN
Original Assignee
Primeblade Sweden Ab
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 Primeblade Sweden Ab filed Critical Primeblade Sweden Ab
Publication of WO2024141386A1 publication Critical patent/WO2024141386A1/fr

Links

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
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C—APPARATUS FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05C1/00—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating
    • B05C1/04—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length
    • B05C1/08—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line
    • B05C1/0817—Apparatus in which liquid or other fluent material is applied to the surface of the work by contact with a member carrying the liquid or other fluent material, e.g. a porous member loaded with a liquid to be applied as a coating for applying liquid or other fluent material to work of indefinite length using a roller or other rotating member which contacts the work along a generating line characterised by means for removing partially liquid or other fluent material from the roller, e.g. scrapers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F15/00—Screen printers
    • B41F15/14—Details
    • B41F15/44—Squeegees or doctors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/04—Ducts, containers, supply or metering devices with duct-blades or like metering devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/20—Ink-removing or collecting devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F9/00—Rotary intaglio printing presses
    • B41F9/06—Details
    • B41F9/08—Wiping mechanisms
    • B41F9/10—Doctors, scrapers, or like devices
    • B41F9/1072—Blade construction
    • 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
    • B05C11/045—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 the blades themselves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/002—Materials or surface treatments therefor, e.g. composite materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/0006—Cutting members therefor
    • B26D2001/002—Materials or surface treatments therefor, e.g. composite materials
    • B26D2001/0026—Materials or surface treatments therefor, e.g. composite materials fiber reinforced materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F31/00—Inking arrangements or devices
    • B41F31/02—Ducts, containers, supply or metering devices
    • B41F31/027—Ink rail devices for inking ink rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41N—PRINTING PLATES OR FOILS; MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING, INKING, DAMPING, OR THE LIKE; PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM
    • B41N10/00—Blankets or like coverings; Coverings for wipers for intaglio printing
    • B41N10/005—Coverings for wipers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2235/00—Cleaning
    • B41P2235/10—Cleaning characterised by the methods or devices
    • B41P2235/20—Wiping devices
    • B41P2235/21—Scrapers, e.g. absorbent pads
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/06—Apparatus for electrographic processes using a charge pattern for developing
    • G03G15/08—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer
    • G03G15/0806—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller
    • G03G15/0812—Apparatus for electrographic processes using a charge pattern for developing using a solid developer, e.g. powder developer on a donor element, e.g. belt, roller characterised by the developer regulating means, e.g. structure of doctor blade

Definitions

  • Doctor blades are blades for removing excess material from rollers or cylinders.
  • the excess material may be coatings provided on, for example, papermaking machines rollers or ink applied to printing rollers.
  • the surfaces of some printing or inking rollers comprise depressions separated by lands. Ink is applied to the whole surface of the roller and excess ink on the lands is removed by the doctor blade, leaving ink only in the depressions.
  • the purpose of the doctor blade is to remove ink for the raised lands on the surface of the roller while leaving the ink in the depressions.
  • the doctor blade may subject to wear on the edge which is in contact with the surface of the cylinder and often is made from a wear resistant metal alloy. Such alloys are expensive which leads to high costs for metal doctor blades.
  • the first blade substrate is subject to wear due to the relative motion and thus is made of a first blade substrate material Ml with a high resistance to wear.
  • a first material with a high resistance to wear for example a steel alloy, is usually more expensive than a similar second material, for example another steel alloy with a similar Young’s modulus, with a lower resistance to wear as such a second material can be made of an alloy with less expensive alloying elements and/or which has been subject to less expensive heat treatments. This leads to lower overall costs for manufacturing such a doctor blade.
  • the first blade substrate has two parallel short sides 104, 104’ of width Wl, two parallel long sides 106, 106’ of length LI, and a depth DI. It comprises a first major surface 105 and a second major surface 107.
  • the adhering layer may be made of an adhesive such as a transfer adhesive which is a film of adhesive which is not supported by a substrate, or a double-sided adhesive film with a film substrate coated on two, opposite major sides with adhesive, or a laminating film made of a polymer which adheres to the first and second blade substrate materials when subject to heat and/or pressure.
  • an adhesive such as a transfer adhesive which is a film of adhesive which is not supported by a substrate, or a double-sided adhesive film with a film substrate coated on two, opposite major sides with adhesive, or a laminating film made of a polymer which adheres to the first and second blade substrate materials when subject to heat and/or pressure.
  • the composite doctor blade is subject to bending forces while in use and should be dimensionally stable during use and therefore needs to have a predetermined stiffness.
  • the Young’s modulus Y2 (the "second Young’s modulus") of the second blade substrate material is similar to the Young’s modulus Yl (the first Young’s modulus ") of the first blade substrate material.
  • the second Young’s modulus Y2 is or equal to or greater than 80% of the first Young’s modulus Y1 and equal to and less than 120% of Yl.
  • Y2 is or equal to or greater than 90% of Yl and equal to and less than 110% of Yl . Even more preferably Y2 is or equal to or greater than 95% of Yl and equal to and less than 105% of Yl. Yet more preferably Y2 is or equal to or greater than 99% of Yl and equal to and less than 101% of Yl.
  • the use of two materials with similar Young’s moduli has the advantage that the composite doctor blade has substantially the same stiffness as a comparable blade, i.e. a blade of similar dimensions, made of only the first blade substrate material Ml while reducing the material costs. Furthermore, the composite doctor blade can have substantially the same dimensions as a doctor blade made of only the first blade substrate material Ml which means that it can replace similar prior art doctor blades without requiring new mountings.
  • the passive material could be a material which is much cheaper than the active material but which has a significantly lower Young’s modulus, for example, a polymer, a rubber, a fibre-reinforced composite material, a honeycomb material or the like.
  • the thickness of the passive material would have to be increased in order to compensate for its reduced Young’s modulus. For example, if the passive material had a Young’s modulus of only 50% of the active material which it is intended to replace, then it should be approximately twice as thick as the layer of active material which it is replacing.
  • LI L2
  • W1 is greater than W2
  • D2 is greater than DI
  • the first and second blade substrates are aligned with each other so that the first major surface 111 of the second blade substrate 109 is fully covered by the first major surface 107 of the first blade substrate 103. This leaves a portion 121 of the second major surface of the first blade substrate exposed.
  • the adhering layer 115 may be placed only between the two mating surfaces of the two substrates, but optionally it may cover the exposed portion 121 of the second major surface of the first blade substrate as shown by dotted lines.
  • Figures 2a) to 2c) show schematically a second embodiment of a doctor blade according to the present invention, in which LI the same as L2 and W1 is greater than W2.
  • the shorts side of the substrates are aligned and the second blade substrate is arranged symmetrically on the first blade substrate. This leaves two portions 121, 121’ of the second major surface of the first blade substrate exposed.
  • the adhering layer 115 may be placed only between the two mating surfaces of the two substrates, but optionally it may cover one or both of the exposed portions 121, 121’ of the second major surface of the first blade substrate.
  • Figure 3 shows a schematic end view of a reversable third embodiment of the present invention in which the first blade substrate 303 and the second blade substrate 309 are both active blade substrates.
  • LI is equal to L2. They are adhered together by adhering layer 115.
  • the two substrates only partly overlap and form a doctor blade with two active edges 331, 331’ - one on each of the substrates. Only one such edge is in contact with a roller or the like at any time and when it becomes worn the doctor blade can be flipped 180 degrees in order to present the unused edge in the active position.
  • Figure 4 shows a schematic end view of a fourth embodiment of the invention, similar to that shown in figure 3 in which the first blade substrate 403 and the second blade substrate 409 may be both active blade substrates but the depth of the second blade substrate D2 is greater than the depth of the first blade substrate DI.
  • the doctor blade will have two active edges which are of different thicknesses and therefore different stiffnesses. This allows a user to choose between different doctor blade properties by simply reversing the doctor blade in its holder.
  • FIG. 5 shows a schematic end view of a fifth embodiment of the present invention in which the second blade substrate 509 is a passive blade substrate and the first blade substrate 503 is an active substrate.
  • the width W2 of the second blade substrate is less than the width W1 of the first blade substrate which is symmetrically arranged on the first major surface of the second blade substrate.
  • Figure 6 shows a schematic end view of a sixth embodiment of the present invention, similar to Figure 5, differing only in the thickness of the passive material.
  • the composite doctor blade is made of two strips of steel of the same grade or differing grades. These strips may be with the same thicknesses or differing thicknesses and are joined by the adhering layer 115, in accordance with Figures 1-6.
  • At least one of the component strips of the composite doctor blade is made out of a polymeric material. It may have the same thickness as another component strip or it may have a differing thickness and the strips may be joined together by the adhering layer 115, in accordance with Figures 1-6.
  • the Young’s modulus is equal to or greater than 180 GPa and less than or equal to 250 GPa, more preferably the Young’s modulus is equal to or greater than 200 GPa and less than or equal to 240 GPa.
  • the depth DI of the active first blade substrate is: equal to or greater than 50 pm and equal to or less than 500 pm and the depth D2 of the second blade substrate is: equal to or greater than 50 pm to and equal to or less than 500 pm.
  • the width W1 of the active first blade substrate is equal to or greater than 8 mm and equal to or less than 80 mm.
  • width W2 of the second blade substrate is equal to W1 or up to 5 mm less than Wl.
  • the stiffness of the passive substrate in the width direction and/or the length direction is equal to or greater than 30 % of the corresponding stiffness of the active substrate. More preferably, the stiffness of the passive substrate in the width direction and/or the length direction is equal to or greater than 50 % of the corresponding stiffness of the active substrate. Even more preferably, the stiffness of the passive substrate in the width direction and/or the length direction is equal to or greater than 100 % of the corresponding stiffness of the active substrate. Yet more preferably, the stiffness of the passive substrate in the width direction and/or the length direction is equal to or greater than 150 % of the corresponding stiffness of the active substrate.
  • the stiffness of the passive substrate in the width direction and/or the length direction is equal to or greater than 200 % of the corresponding stiffness of the active substrate.
  • the amount of active substrate required to give a desired blade stiffness is reduced and this may result in reduced costs if the passive substrate material is cheaper than the active substrate material.
  • the stiffness of the passive substrate in the width direction and/or the length direction is equal to or less than 500 % of the corresponding stiffness of the active substrate. More preferably the stiffness of the passive substrate in the width direction and/or the length direction is equal to or less than 400 % of the corresponding stiffness of the active substrate. Even more preferably the stiffness of the passive substrate in the width direction and/or the length direction is equal to or less than 300 % of the corresponding stiffness of the active substrate.
  • the stiffness of the passive substrate is much higher than that of the active substrate then, for any given doctor blade stiffness, the amount of active substrate material in the doctor blade will be relatively small and this means that the active substrate will wear out more rapidly than a thicker active substrate, thus a compromise has to be made between reducing manufacturing costs of the doctor blade without disproportionally reducing the life of the doctor blade.
  • the active substrate should not be too thin and preferably the thickness of the passive second blade substrate is equal to or less than 400 %of the thickness of the active first blade substrate, more preferably equal to or less than 300% of the thickness of the active first blade substrate and most preferably equal to or less than 200% of the thickness of the active first blade substrate.
  • the cheaper passive second blade substrate should not be too thin, and preferably the thickness of the second blade substrate is equal to or greater than 50 %of the thickness of the active first blade substrate, preferably equal to or greater than 100% of the thickness of the active first blade substrate and more preferably equal to or greater than 200% of the thickness of the active first blade substrate.
  • the contacting surfaces of the first and second blade substrates are preferably adhered to each other by an adhesive.
  • Suitable adhesives are epoxy adhesives, acrylic metal glues, cyanoacrylate adhesives, polyurethane adhesives, anaerobic metal adhesives and the like.
  • the first and second blade substrates can be bonded together by an intermediate thermoplastic polymer to form a metal-polymer-metal sandwich construction.
  • the thermoplastic may be drawn from a wide range of polymeric materials such as polyethylene terephthalate, cellulose acetate, polyethylene, polypropylene, thermoplastic polyurethane, nylon or the like.
  • the thermoplastic may also contain filler materials such as talc, glass, carbon, and metallic particles, etc.
  • the composite doctor blade may comprise a single active blade substrate and a single passive blade substrate.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Paper (AREA)

Abstract

Une racle (101) comprend un premier substrat actif (103), lequel premier substrat comprend une première surface principale (105) et une seconde surface principale (107), ledit premier substrat de racle ayant une largeur maximale W1, une longueur maximale L1 et une épaisseur maximale T1, et un second substrat passif (109), ledit premier substrat de racle ayant une résistance à l'usure qui est supérieure à la résistance à l'usure dudit second substrat de racle lorsqu'elle est mesurée selon la norme ASTM G195 de juin 2022 "Guide standard pour mener des tests d'usure à l'aide d'un abrasimètre à plateforme rotative".
PCT/EP2023/087083 2022-12-29 2023-12-20 Racle composite WO2024141386A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE2251595A SE2251595A1 (en) 2022-12-29 2022-12-29 Composite doctor blade
SE2251595-1 2022-12-29

Publications (1)

Publication Number Publication Date
WO2024141386A1 true WO2024141386A1 (fr) 2024-07-04

Family

ID=89509019

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2023/087083 WO2024141386A1 (fr) 2022-12-29 2023-12-20 Racle composite

Country Status (2)

Country Link
SE (1) SE2251595A1 (fr)
WO (1) WO2024141386A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128551A (en) * 1982-10-13 1984-05-02 Inventing Ab Scraper with wear-resistant coating
WO1999002346A1 (fr) 1997-07-11 1999-01-21 Societe Novatec S.A. Racle d'application de produits presentant un degre de viscosite important et des caracteristiques de thixotropie sur un substrat pouvant presenter des variations de hauteur, a travers un pochoir, applique au dit substrat
EP1288732A2 (fr) * 2001-08-30 2003-03-05 CF Technologies Lame de dosage, réservoir de toner utilisant une telle lame de dosage et méthode de copie
WO2011088583A1 (fr) 2010-01-20 2011-07-28 Daetwyler Swisstec Ag Racloir
JP2016177199A (ja) * 2015-03-20 2016-10-06 Nok株式会社 ブレード本体及びクリーニングブレード

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4549933A (en) * 1983-07-05 1985-10-29 Thermo Electron Corporation Doctor blade with non-homogeneous stiffness properties
EP1092535A1 (fr) * 1999-10-13 2001-04-18 Think Laboratory Co., Ltd. Racle
DE20216016U1 (de) * 2002-10-18 2004-03-04 Rk Siebdrucktechnik Gmbh Rakel, insbesondere für den Siebdruck
JP4594323B2 (ja) * 2003-11-21 2010-12-08 メッツォ ペーパー インコーポレイテッド ペーパーウェブの製造又は仕上装置の構造を強化する方法
BRPI0621982A2 (pt) * 2006-08-29 2011-12-20 Daetwyler Swisstec Ag lámina de raspar
DE102010001306A1 (de) * 2010-01-28 2011-08-18 Voith Patent GmbH, 89522 Schaberklinge
EP2823100A4 (fr) * 2012-03-08 2016-03-23 Swedev Aktiebolag Racle à revêtement multicouche réalisée par électrodéposition sous impulsions de courant
US11459701B2 (en) * 2018-03-28 2022-10-04 Kadant Inc. Wear composites including one or more metal layers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2128551A (en) * 1982-10-13 1984-05-02 Inventing Ab Scraper with wear-resistant coating
WO1999002346A1 (fr) 1997-07-11 1999-01-21 Societe Novatec S.A. Racle d'application de produits presentant un degre de viscosite important et des caracteristiques de thixotropie sur un substrat pouvant presenter des variations de hauteur, a travers un pochoir, applique au dit substrat
EP1288732A2 (fr) * 2001-08-30 2003-03-05 CF Technologies Lame de dosage, réservoir de toner utilisant une telle lame de dosage et méthode de copie
WO2011088583A1 (fr) 2010-01-20 2011-07-28 Daetwyler Swisstec Ag Racloir
JP2016177199A (ja) * 2015-03-20 2016-10-06 Nok株式会社 ブレード本体及びクリーニングブレード

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