WO2013168777A1 - Slurry coating device and slurry coating method - Google Patents

Slurry coating device and slurry coating method Download PDF

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Publication number
WO2013168777A1
WO2013168777A1 PCT/JP2013/063077 JP2013063077W WO2013168777A1 WO 2013168777 A1 WO2013168777 A1 WO 2013168777A1 JP 2013063077 W JP2013063077 W JP 2013063077W WO 2013168777 A1 WO2013168777 A1 WO 2013168777A1
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WIPO (PCT)
Prior art keywords
slurry
strip
belt
band
application
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PCT/JP2013/063077
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French (fr)
Japanese (ja)
Inventor
木島　秀夫
裕士 原田
山口　誠
純一 鳥生
Original Assignee
Ｊｆｅスチール株式会社
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Application filed by Ｊｆｅスチール株式会社 filed Critical Ｊｆｅスチール株式会社
Priority to EP13788396.3A priority Critical patent/EP2848319B1/en
Priority to IN2163MUN2014 priority patent/IN2014MN02163A/en
Priority to RU2014144620A priority patent/RU2607407C2/en
Priority to KR1020147030978A priority patent/KR101716944B1/en
Priority to CN201380023908.8A priority patent/CN104271258B/en
Publication of WO2013168777A1 publication Critical patent/WO2013168777A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B13/00—Machines or plants for applying liquids or other fluent materials to surfaces of objects or other work by spraying, not covered by groups B05B1/00 - B05B11/00
    • B05B13/02—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work
    • B05B13/04—Means for supporting work; Arrangement or mounting of spray heads; Adaptation or arrangement of means for feeding work the spray heads being moved during spraying operation
    • B05B13/0463—Installation or apparatus for applying liquid or other fluent material to moving work of indefinite length
    • B05B13/0468—Installation or apparatus for applying liquid or other fluent material to moving work of indefinite length with reciprocating or oscillating spray heads
    • B05B13/0473—Installation or apparatus for applying liquid or other fluent material to moving work of indefinite length with reciprocating or oscillating spray heads with spray heads reciprocating along a straight line
    • 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
    • B05C1/0826—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 the work being a web or sheets
    • 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
    • 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
    • B05C11/023—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface
    • B05C11/025—Apparatus for spreading or distributing liquids or other fluent materials already applied to a surface with an essentially cylindrical body, e.g. roll or rod
    • 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
    • B05C5/00—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work
    • B05C5/02—Apparatus in which liquid or other fluent material is projected, poured or allowed to flow on to the surface of the work the liquid or other fluent material being discharged through an outlet orifice by pressure, e.g. from an outlet device in contact or almost in contact, with the work
    • B05C5/027—Coating heads with several outlets, e.g. aligned transversally to the moving direction of a web to be coated
    • 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
    • B05C9/00—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important
    • B05C9/04—Apparatus or plant for applying liquid or other fluent material to surfaces by means not covered by any preceding group, or in which the means of applying the liquid or other fluent material is not important for applying liquid or other fluent material to opposite sides of the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1216—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties the working step(s) being of interest
    • C21D8/1238—Flattening; Dressing; Flexing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
    • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
    • C21D8/1277—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a particular surface treatment
    • C21D8/1283—Application of a separating or insulating coating
    • 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
    • B05C11/021—Apparatus for spreading or distributing liquids or other fluent materials already applied to the surface of an elongated body, e.g. a wire, a tube
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2252/00—Sheets
    • B05D2252/02—Sheets of indefinite length
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials

Definitions

  • the present invention relates to a slurry coating apparatus and a slurry coating method for coating a slurry of an annealing separator for preventing seizure when performing high temperature annealing on a coil wound with a grain-oriented electrical steel sheet to the grain-oriented electrical steel sheet. .
  • grain-oriented electrical steel sheets are mainly used as iron core materials for transformers, generators, and other electrical equipment. Therefore, the grain-oriented electrical steel sheet is required to have a good surface coating in addition to good magnetic properties (iron loss).
  • the surface coating of the steel plate is made of a ceramic coating called a forsterite coating.
  • a forsterite coating When forming a forsterite film, first, a material that has been rolled to a predetermined thickness by cold rolling is used as a raw material, and an oxide film (subscale) containing silicon oxide (SiO 2 ) as a base material for this material. ). Next, after applying magnesium oxide (MgO) on the oxide film, the steel sheet is wound into a coil shape. Thereafter, in the finish annealing step, the coiled grain-oriented electrical steel sheet is heat-treated at a high temperature of 1000 ° C. or higher. Thereby, SiO 2 and MgO react on the surface of the steel sheet to form a forsterite film (Mg 2 SiO 4 film).
  • MgO applied to the surface of the steel sheet also serves as an adhesion preventing agent for preventing adhesion between coil layers in the final annealing process, it is also referred to as an annealing separator.
  • the steel sheet is flattened (planarized) to correct the shape of the steel sheet to obtain a product.
  • this annealing separator such as MgO is generally suspended in water to form a slurry. Then, on the exit side of the continuous annealing furnace in the decarburization annealing step, the supply nozzle and the squeeze roll apply this slurry so as to have a predetermined film thickness on both the upper surface and the lower surface of the strip. At this time, a liquid pool is often formed on the entrance side of the squeeze roll on the upper surface side of the belt-like body. Subsequently, after the annealing separator is dried in a drying furnace, the strip is wound to obtain a coil.
  • these supply nozzles and squeeze rolls as described in Patent Document 1, supply the slurry to the belt-like body by the supply nozzle, and then adjust the film thickness of the slurry by squeeze rolls such as a rough application roll and an application roll. Adjustable arrangement. Depending on the required accuracy of the film thickness and the installation space, only one of the coarse application roll and the application roll is installed, or a nozzle is further provided between the coarse application roll and the application roll.
  • a supply nozzle and a squeeze roll may be configured to supply the slurry.
  • Patent Document 2 there is a case where the slurry is supplied to the band by the supply nozzle after the band has passed through all the application rolls.
  • a plurality of nozzles for supplying the slurry are installed at intervals of several hundred mm in the width direction that is perpendicular to the traveling direction of the strip.
  • a saddle-like shape defect parallel to the longitudinal direction may occur in the belt-like body that is a steel plate.
  • the portion where such a shape defect has occurred does not become a product, so it must be discarded.
  • the occurrence of shape defects leads to a decrease in yield in the production of steel sheets.
  • the details of the mechanism by which this saddle-shaped defect occurs are not clear, and the development of a technique for suppressing the occurrence of this saddle-shaped defect has been demanded.
  • the present invention has been made in view of the above, and the object thereof is to suppress the occurrence of saddle-like shape defects along the longitudinal direction of a steel sheet, which are likely to occur after flattening annealing in the manufacture of a steel sheet.
  • An object of the present invention is to provide a slurry coating apparatus and a slurry coating method capable of improving the yield in the production of steel sheets.
  • a slurry application apparatus is capable of supplying the slurry to the belt-like body in a slurry application device that applies slurry to a traveling belt-like body.
  • the slurry discharge means is configured, and the relative positional relationship between the slurry discharge means and the band is approximately parallel to the surface of the band and substantially perpendicular to the traveling direction of the band.
  • the slurry is supplied to the belt-like body by the slurry discharge means while being changed.
  • the slurry application apparatus includes a pair of application means configured to apply the slurry to the surface of the belt-like body by pressing the belt-like body while pressing the belt-like body.
  • the slurry discharge means is configured to be able to swing relative to the strip in a direction substantially parallel to the surface of the strip and substantially perpendicular to the traveling direction of the strip.
  • the slurry discharge means is provided on the upstream side in the traveling direction of the belt-like body with respect to the pair of application means.
  • a second slurry discharge means configured to be able to supply the slurry to the band-like body is provided on the downstream side in the traveling direction of the band-like body with respect to the coating means.
  • the second slurry discharge means is substantially parallel to the surface of the belt and in a direction substantially perpendicular to the traveling direction of the belt. It is configured to be able to swing relative to the belt-like body.
  • the slurry discharge means is provided on the downstream side in the traveling direction of the belt-like body with respect to the pair of application means.
  • 3rd slurry discharge means comprised so that supply of the said slurry to the said strip
  • the slurry coating apparatus is characterized in that, in the above invention, the temporal change of the swing amount in the swing is a rectangular wave shape, a sine wave shape, or a triangular wave shape.
  • the slurry coating apparatus according to the present invention is characterized in that, in the above invention, the slurry coating apparatus that holds the slurry discharge means is configured to be swingable relative to the belt-like body. .
  • the oscillation frequency of the slurry discharge means is set based on a turn pitch of a coil formed by winding the strip. .
  • the slurry coating apparatus is characterized in that, in the above invention, the oscillation frequency of the slurry discharge means is set based on an even multiple of the turn pitch.
  • the belt-like body is disposed on the slurry discharge means in a direction substantially parallel to the surface of the belt-like body and substantially perpendicular to the traveling direction of the belt-like body.
  • a strip-shaped body swinging means configured to be relatively swingable, and a pair of coating units configured to be able to apply the supplied slurry to the surface of the strip-shaped body by pressing and holding the strip-shaped body And means.
  • the slurry application apparatus is the slurry application apparatus according to the above invention, wherein the slurry is pressed against the pair of application means on the downstream side along the traveling direction of the band-like body while holding the band-like body. Is provided on the surface of the belt-like body in a second pair of application means.
  • the slurry coating apparatus is configured to be capable of supplying the slurry to the strip on the downstream side along the traveling direction of the strip with respect to the pair of coating means.
  • a second slurry discharge means is provided.
  • the slurry coating apparatus is characterized in that, in the above-mentioned invention, the time variation of the swinging amount of the band-like body is a rectangular wave shape, a sine wave shape, or a triangular wave shape.
  • the slurry coating apparatus is characterized in that, in the above invention, the oscillation frequency of the strip is set based on a turn pitch of a coil formed by winding the strip.
  • the slurry coating apparatus according to the present invention is characterized in that, in the above invention, the oscillation frequency of the strip is set based on an even multiple of the turn pitch.
  • the slurry application method according to the present invention is a slurry application method in which slurry is applied to a traveling belt-like body, and is substantially parallel to the surface of the belt-like body and substantially perpendicular to the traveling direction of the belt-like body.
  • the slurry is supplied to the strip while changing the relative positional relationship between the discharge port of the slurry and the strip.
  • the slurry application method according to the present invention is the above-described invention, wherein the discharge port is relatively parallel to the surface of the strip and is substantially perpendicular to the running direction of the strip.
  • the slurry application method according to the present invention is the above-described invention, wherein the belt-like body is relative to the discharge port in a direction substantially parallel to the surface of the belt-like body and substantially perpendicular to the traveling direction of the belt-like body.
  • the slurry application method according to the present invention is the slurry application method according to the above invention, wherein after the slurry application step, the slurry is applied to the surface of the belt by holding and pressing the belt supplied with the slurry.
  • the method further includes two slurry application steps.
  • the slurry application method according to the present invention is characterized in that, in the above invention, after the slurry application step, a second slurry supply step is provided for supplying the slurry to the strip.
  • the slurry in the above invention, in the second slurry supply step, the slurry is applied in a direction substantially parallel to a surface of the strip and substantially perpendicular to a traveling direction of the strip.
  • the slurry is supplied to the belt-like body while the slurry discharge port is swung relative to the belt-like body.
  • a second slurry application step of applying the slurry onto the surface of the band by holding and pressing the band supplied with the slurry in the above invention, in the third slurry supply step for supplying the slurry to the strip and the third slurry supply step before the slurry supply step, And a second slurry application step of applying the slurry onto the surface of the band by holding and pressing the band supplied with the slurry.
  • the slurry application method according to the present invention is characterized in that, in the above-described invention, the temporal change of the swing amount in the swing is a rectangular wave shape, a sine wave shape, or a triangular wave shape.
  • the slurry application method according to the present invention is characterized in that, in the above-mentioned invention, the oscillation frequency in the oscillation is set based on a turn pitch of a coil formed by winding the strip.
  • the slurry application method according to the present invention is characterized in that, in the above invention, the oscillation frequency in the oscillation is set based on an even multiple of the turn pitch.
  • the slurry application method according to the present invention is characterized in that, in the above-mentioned invention, the temporal change in the amount of oscillation of the belt-like body is a rectangular wave shape, a sine wave shape, or a triangular wave shape.
  • the slurry application method according to the present invention is characterized in that, in the above invention, the oscillation frequency of the strip is set based on a turn pitch of a coil formed by winding the strip.
  • the slurry application method according to the present invention is characterized in that, in the above invention, the oscillation frequency of the strip is set based on an even multiple of the turn pitch.
  • the slurry coating apparatus and the slurry coating method according to the present invention there is an effect that it is possible to improve the yield in the production of steel sheets by suppressing the occurrence of saddle-like shape defects along the longitudinal direction of the steel sheets.
  • FIG. 1 is a diagram illustrating a configuration example of a slurry coating apparatus according to Embodiment 1 of the present invention.
  • FIG. 2 is a conceptual diagram showing a conventional slurry coating apparatus and a film thickness distribution of the annealing separator slurry on the surface of the strip.
  • FIG. 3A is a cross-sectional perspective view of a coil of a belt-like body to which a conventional annealing separator slurry is applied.
  • FIG. 3B is a partially enlarged cross-sectional view of a portion surrounded by a broken line in FIG. 3A.
  • FIG. 4A is a graph showing an example of swing control of the slurry supply nozzle by the slurry applying apparatus according to Embodiment 1 of the present invention.
  • FIG. 4A is a graph showing an example of swing control of the slurry supply nozzle by the slurry applying apparatus according to Embodiment 1 of the present invention.
  • FIG. 4B is a graph showing another example of the swing control of the slurry supply nozzle by the slurry applying apparatus according to Embodiment 1 of the present invention.
  • FIG. 4C is a graph showing still another example of the swing control of the slurry supply nozzle by the slurry applying apparatus according to the first embodiment of the present invention.
  • FIG. 5 is a conceptual diagram showing the slurry coating apparatus according to Embodiment 1 of the present invention and the film thickness distribution of the annealing separator slurry on the surface of the belt-like body when the slurry supply nozzle is controlled in a sine wave shape.
  • FIG. 6A is a conceptual diagram showing the slurry application apparatus according to Embodiment 1 of the present invention and the film thickness distribution of the annealing separator slurry on the surface of the belt-like body when the slurry supply nozzle is controlled to have a rectangular wave shape.
  • FIG. 6B is a partially enlarged cross-sectional view of a state in which a strip-like body coated with the annealing separator slurry in Embodiment 1 of the present invention is coiled.
  • FIG. 7A is a configuration diagram illustrating a first modification of the slurry applying apparatus according to Embodiment 1 of the present invention.
  • FIG. 7B is a configuration diagram showing a second modification of the slurry applying apparatus according to Embodiment 1 of the present invention.
  • FIG. 7C is a configuration diagram showing a third modification of the slurry applying apparatus according to Embodiment 1 of the present invention.
  • FIG. 8 is a diagram illustrating a configuration example of the slurry applying apparatus according to the second embodiment of the present invention.
  • FIG. 9A is a graph showing an example of swing control for the belt-like body according to Embodiment 2 of the present invention.
  • FIG. 9B is a graph showing another example of the swing control for the band according to the second embodiment of the present invention.
  • FIG. 9C is a graph showing still another example of the swing control for the band according to the second embodiment of the present invention.
  • FIG. 9A is a graph showing an example of swing control for the belt-like body according to Embodiment 2 of the present invention.
  • FIG. 9B is a graph showing another example of the swing control for the band according to the second embodiment of the present invention.
  • FIG. 9C is a graph showing still another example of the swing control for the band according to the second embodiment of the present invention
  • FIG. 10 is a conceptual diagram showing the slurry coating apparatus according to Embodiment 2 of the present invention and the film thickness distribution of the annealing separator slurry on the surface of the band when the band-shaped body is controlled to swing sinusoidally.
  • FIG. FIG. 11A is a concept showing a slurry coating apparatus according to Embodiment 2 of the present invention and a film thickness distribution of the annealing separator slurry on the surface of the band when the band-shaped rocking control is performed on the band.
  • FIG. FIG. 11B is a partially enlarged cross-sectional view of a state in which a strip-like body coated with the annealing separator slurry in Embodiment 2 of the present invention is coiled.
  • FIG. 12A is a configuration diagram illustrating a first modification of the slurry application apparatus according to Embodiment 2 of the present invention.
  • FIG. 12B is a configuration diagram showing a second modification of the slurry applying apparatus according to Embodiment 2 of the present invention.
  • FIG. 12C is a configuration diagram illustrating a third modification of the slurry application apparatus according to Embodiment 2 of the present invention.
  • FIG. 1 is a diagram illustrating a configuration example of a slurry coating apparatus according to Embodiment 1 of the present invention.
  • the slurry application apparatus 20 is an apparatus that applies an annealing separator slurry 4 to a steel plate, and includes a squeeze roll 2 and a slurry supply nozzle 3.
  • the slurry supply nozzle 3 is a slurry discharge means having a plurality of discharge ports for supplying the annealing separator slurry 4 to the strip 1 that is a grain-oriented electrical steel sheet.
  • the squeeze roll 2 is a pair of application means that squeeze the annealing separator slurry 4 applied on the strip 1 to a predetermined thickness.
  • the slurry supply nozzle 3 is substantially parallel to the surface of the strip 1 and is generally perpendicular to the direction in which the strip 1 is sent out (the travel direction of the strip 1). In this direction, that is, in the width direction of the strip 1, it is configured to be able to swing relative to the strip 1.
  • the squeeze roll 2 is The band-like body 1 is pressed (clamped) while being gripped in the thickness direction, and the annealing separator slurry 4 applied to the surface of the band-like body 1 is squeezed to a predetermined film thickness.
  • the strip 1 is subjected to various processes such as a finish annealing process (secondary recrystallization annealing process), a coating process, and a flattening annealing process, and finally becomes a product of an electromagnetic steel sheet.
  • the present inventors have studied the saddle-like shape defect formed on the surface of the strip 1 after the flattening annealing in the case of using a conventional slurry coating apparatus. As a result, the present inventors have found that a certain correlation is recognized between the generation position along the width direction of the strip 1 and the installation position along the width direction of the slurry supply nozzle 3 with respect to the shape defect. I found out. Then, the inventors pay attention to the fact that the film thickness of the annealing separator slurry 4 has a non-uniform distribution along the width direction of the strip 1, and this film thickness distribution affects the shape defect. I came to remember.
  • FIG. 2 shows the configuration of this conventional slurry coating apparatus and the width direction of the strip 1 of the annealing separator slurry 4 after the annealing separator slurry 4 on the strip 1 is narrowed to a predetermined film thickness. The film thickness distribution is shown.
  • the film thickness of the annealing separator slurry 4 is set to each of the slurry supply nozzles 103. This is considered to be large at a position close to the discharge port and small at a position far away. Therefore, in the conventional slurry coating apparatus 100, the film thickness distribution of the annealing separator slurry 4 along the width direction of the strip 1 and the film thickness distribution of the annealing separator slurry 4 along the longitudinal direction of the strip 1 are obtained. I was in control.
  • the thickness difference of the film thickness of the annealing separator slurry 4 on the surface of the strip 1 is within a predetermined range.
  • the thickness difference of the film thickness of the annealing separator slurry 4 falls within a predetermined range as described above, the occurrence of the above-described bowl-shaped shape defect cannot be avoided.
  • the present inventors conducted further intensive studies, and further examined the influence of uneven application of the annealing separator slurry 4 on the occurrence of shape defects.
  • FIG. 3A is a cross-sectional perspective view of a coil of a belt-like body to which a conventional annealing separator slurry is applied.
  • FIG. 3A shows a cross section along the width direction of the strip 1 in a state where the strip 1 coated with the annealing separator slurry 4 is wound up by the slurry supply nozzle 103 to form a coil 10.
  • FIG. 3B is a partially enlarged cross-sectional view showing a cross section of a portion surrounded by a broken line in FIG. 3A.
  • the peak of the annealing separator slurry 4 on the surface of the strip 1 is formed as shown in FIG. 3B.
  • the coils 10 are sequentially laminated in the radial direction of the circle in the cross section along the longitudinal direction of the strip 1, so-called build-up occurs, and the annealing separator slurry 4 protrudes (inside the broken line in FIG. 3B).
  • the buildup in the peak part of the annealing separator slurry 4 on the surface of the strip 1 causes the shape defect of the strip 1 during the finish annealing process.
  • the position of the streak pattern due to the coating unevenness that is visually recognized after supplying the annealing separator slurry 4 to the surface of the strip 1 does not necessarily match the position of the shape defect formed on the surface of the strip 1.
  • the present inventors have a non-uniform film thickness rather than completely suppressing the occurrence of a non-uniform film thickness distribution of the annealing separator slurry 4 along the width direction of the strip 1 that is unavoidable. Recalling that the occurrence of shape defects can be suppressed if the distribution of the film thickness is made as gentle as possible, or the build-up when the strip 1 is made into a coil can be suppressed on the premise of the occurrence of the distribution.
  • the slurry application device 20 is configured so that the slurry supply nozzle 3 having a plurality of discharge ports is parallel to the surface of the band 1 and the band 1 A configuration is adopted in which rocking is performed relative to the band 1 along a direction perpendicular to the traveling direction, that is, the width direction of the band 1.
  • the slurry supply nozzle 3 discharges and supplies the annealing separator slurry 4 to the surface of the band 1 while swinging relative to the band 1 along the width direction of the band 1.
  • the slurry supply nozzle 3 changes the relative positional relationship between the discharge port and the strip 1 along the width direction of the strip 1 over time, while annealing separator slurry with respect to the strip 1. 4 can be supplied.
  • FIG. 4A, FIG. 4B, and FIG. 4C are all graphs showing an example of a control method for changing the amount of rocking when the slurry supply nozzle 3 is rocked over time.
  • FIG. 5 is a conceptual diagram showing the slurry coating apparatus according to Embodiment 1 of the present invention and the film thickness distribution of the annealing separator slurry on the surface of the belt-like body when the slurry supply nozzle is controlled in a sine wave shape.
  • FIG. 5 shows the thickness distribution of the annealing separator slurry 4 on the surface of the strip 1 when the swing of the slurry supply nozzle 3 is controlled based on the configuration diagram of the slurry application device 20 and the graph shown in FIG. 4A. And a graph showing.
  • the slurry supply nozzle 3 swings in a sine wave shape as shown in FIG. 4A or swings in a triangular wave shape as shown in FIG. 4B along the width direction of the strip 1.
  • the film thickness distribution of the annealing separator slurry 4 along the width direction of the strip 1 shakes the slurry supply nozzle 103 described above.
  • the supply of the annealing separator slurry 4 is averaged with respect to the width direction of the strip 1 between the plurality of discharge ports of the slurry supply nozzle 3.
  • the pitch T shown in FIGS. 4A and 4B is preferably 1 to 150 seconds, and preferably 2 to 120 seconds.
  • the annealing separator slurry 4 is gently applied to the surface of the strip 1 and annealed as compared to the non-uniformity of the film thickness distribution of the annealing separator slurry 4 shown in FIG. Since the valleys and peaks of the separating agent slurry 4 are gently formed, the thickness difference in the film thickness distribution of the annealing separating agent slurry 4 is relaxed and becomes gentle. As a result, it is possible to prevent the occurrence of shape defects on the surface of the strip 1.
  • the triangular wave-like folded end portion has a smooth substantially triangular wave shape waveform as shown in FIG.
  • a trapezoidal wave shape may be obtained by stopping at this end portion for a finite period of time.
  • these oscillations are also included in the triangular wave oscillation.
  • FIG. 6A is a conceptual diagram showing the slurry application apparatus according to Embodiment 1 of the present invention and the film thickness distribution of the annealing separator slurry on the surface of the belt-like body when the slurry supply nozzle is controlled to have a rectangular wave shape.
  • FIG. 6A shows two layers of the annealing separator slurry 4 on the surface of the strip 1 when the swing amount of the slurry supply nozzle 3 is controlled based on the configuration diagram of the slurry application device 20 and the graph shown in FIG. 4C. And a graph showing the film thickness distribution.
  • FIG. 6A shows two layers of the annealing separator slurry 4 on the surface of the strip 1 when the swing amount of the slurry supply nozzle 3 is controlled based on the configuration diagram of the slurry application device 20 and the graph shown in FIG. 4C. And a graph showing the film thickness distribution.
  • FIG. 6A shows two layers of the annealing separator slurry 4 on the surface of the strip 1 when the
  • FIG. 6B is a partially enlarged cross-sectional view of a state in which a strip-like body coated with the annealing separator slurry in Embodiment 1 of the present invention is coiled.
  • FIG. 6B is a diagram in the case where the annealing separator slurry 4 is applied to the surface of the strip 1 as shown in FIG. 6A and then the strip 1 is wound into a coil to form the coil 10 shown in FIG. 3A.
  • a laminated structure of the coil 10 corresponding to 3B is shown.
  • the slurry supply nozzle 3 swings in a rectangular wave shape along the width direction of the strip 1 as shown in FIG. 4C, when the strip 1 is used as the coil 10 as shown in the graph of the film thickness distribution in FIG.
  • the crests and troughs of the annealing separator slurry 4 overlap between the two layers of the laminated strip 1.
  • the pitch T shown in FIG. 4C is preferably 1 to 150 seconds, and preferably 2 to 120 seconds. This is because if the pitch T in the case of controlling the time variation of the swing amount of the slurry supply nozzle 3 to be a rectangular wave is too shorter than 1 second, the film thickness distribution of the annealing separator slurry 4 as shown in FIG. If it is longer than 150 seconds, the amount of deviation per turn when the strip 1 is used as the coil 10 becomes small, and the crest and trough of the annealing separator slurry 4 overlap between the two layers. This is because a build-up as shown in FIG. 3B occurs.
  • the peaks and valleys in the film thickness distribution of the annealing separator slurry 4 are sequentially along the radial direction of the circle of the section along the longitudinal direction of the strip 1 in the coil 10. Since they are stacked, the build-up described above can be prevented. Therefore, it is possible to suppress the occurrence of a shape defect in the band 1.
  • the swing of the slurry supply nozzle 3 it is simple to swing only the slurry supply nozzle 3, but the present invention is not necessarily limited thereto.
  • the slurry supply nozzle 3 is swung with respect to the strip 1 by swinging the entire slurry application device 20 holding the slurry supply nozzle 3 relative to the traveling strip 1.
  • incidental equipment such as a coating roll provided in the slurry coating apparatus 20 may be swung together.
  • FIG. 7A, FIG. 7B, and FIG. 7C are configuration diagrams respectively showing a first modification, a second modification, and a third modification of the slurry applying apparatus according to the first embodiment.
  • the slurry application device 21 includes a rough application roll 2a, a pair of backup rolls 2b, a pair of application rolls 2c, and a pair of rough application rolls. It has a nozzle 3a.
  • the pair of pre-rough application roll nozzles 3 a is a pair of slurry discharge means for supplying the annealing separator slurry 4 to both surfaces of the strip 1.
  • the pair of rough coating rolls 2a presses (nips) the belt-shaped body 1 while gripping the belt-shaped body 1 in the thickness direction, and roughens the annealing separator slurry 4 supplied by the nozzle 3a before the rough coating roll on both surfaces of the belt-shaped body 1. It is a pair of application means to apply.
  • the pair of coating rolls 2 c is a coating unit that squeezes the coarsely coated annealing separator slurry 4 supported by a pair of backup rolls 2 b provided on both sides of the strip 1. And in the slurry application apparatus 21 by this 1st modification, the nozzle 3a before rough
  • the nozzle 3a before the rough application roll discharges and supplies the annealing separator slurry 4 to both surfaces of the strip 1 while swinging in this way.
  • the nozzle 3a before the rough coating roll is annealed and separated from the strip 1 while changing the relative positional relationship between the discharge port and the strip 1 along the width direction of the strip 1 over time.
  • the agent slurry 4 can be supplied.
  • the slurry application device 22 according to the second modification example of the first embodiment is similar to the slurry application unit 21 or the second or third method as the slurry application apparatus 21 according to the first modification example described above.
  • the slurry discharge means or the downstream side of the nozzle 3a before the coarse application roll as the slurry discharge means and upstream of the pair of application rolls 2c in the traveling direction of the band 1 It has a pre-application roll nozzle 3b as a third or second slurry discharge means.
  • At least any one of the nozzle 3a before a rough application roll and the nozzle 3b before an application roll is set to the strip
  • it is configured to be relatively swingable.
  • At least one of the pre-coating roll nozzle 3a and the pre-coating roll nozzle 3b discharges and supplies the annealing separator slurry 4 to both surfaces or one surface of the strip 1 while swinging in this manner.
  • At least one of the nozzle 3a before the rough application roll and the nozzle 3b before the application roll changes the relative positional relationship between the discharge port and the strip 1 along the width direction of the strip 1 over time. While changing, the annealing separator slurry 4 can be supplied to the strip 1.
  • the slurry coating apparatus 23 according to the third modification of the first embodiment has a configuration similar to that of the slurry coating apparatus 21 according to the first modification described above, and further includes a pair of On the downstream side in the traveling direction of the strip 1 of the coating roll 2c, there is a post-rolling nozzle 3c as a second slurry discharge means.
  • the slurry application device 23 according to the third modification at least one of the nozzle 3a before the rough application roll and the nozzle 3c after the application roll is in the width direction of the strip 1 (in FIG. 7C, the direction perpendicular to the paper surface). And can be swung relative to the belt-like body 1.
  • At least one of the nozzle 3a before the rough application roll and the nozzle 3c after the application roll discharges and supplies the annealing separator slurry 4 to both surfaces or one surface of the strip 1 while swinging in this way.
  • at least one of the nozzle 3a before the coarse application roll and the nozzle 3c after the application roll changes the relative positional relationship between the discharge port and the strip 1 along the width direction of the strip 1 over time. While changing, the annealing separator slurry 4 can be supplied to the strip 1.
  • Example 1 to 30 and Comparative Example 1 In Examples 1 to 30 and Comparative Example 1, first, a cold-rolled sheet of grain-oriented electrical steel sheet having a final sheet thickness of 0.3 mm containing 3.4% by weight of silicon (Si) is used as the strip 1. And after performing decarburization annealing with respect to this strip
  • the coating amount of the annealing separator slurry 4 per one surface is oxidized on both surfaces of the strip 1 by setting the coating amount of the annealing separator slurry 4 per side to 7.0 g / m 2 by the nozzle 3a before the rough coating roll and the nozzle 3b before the coating roll. Apply magnesium (MgO). Then, after winding the strip
  • At least one of the pre-coating roll nozzle 3a and the pre-coating roll nozzle 3b swings when the annealing separator slurry 4 is applied to the surface of the strip 1 as follows. Do.
  • Examples 1 to 5 only the nozzle 3a before the rough coating roll is used, and the pitch T shown in FIG. 4A is set to 1 second, 2 seconds, 60 seconds, 120 seconds, and 150 seconds, respectively. Control and swing.
  • Examples 6 to 10 only the nozzle 3b before the coating roll is used, and the pitch T shown in FIG. 4A is set to 1 second, 2 seconds, 60 seconds, 120 seconds, and 150 seconds, respectively, and the time variation of the swing amount is sinusoidal. Control and swing.
  • Examples 11 to 15 only the nozzle 3a before the coarse application roll is set to have a pitch T shown in FIG. 4C of 1 second, 2 seconds, 60 seconds, 120 seconds, and 150 seconds, respectively. Control and swing.
  • Examples 16 to 20 only the nozzle 3b before the application roll is set to have the pitch T shown in FIG. 4C as 1 second, 2 seconds, 60 seconds, 120 seconds, and 150 seconds, respectively, and the change over time in the amount of rocking is made into a rectangular wave shape. Control and swing.
  • both the coarse coating roll pre-nozzle nozzle 3a and the pre-coating roll nozzle 3b have the pitch T shown in FIG. 4A as 1 second, 2 seconds, 60 seconds, 120 seconds, and 150 seconds, respectively.
  • the time change is controlled in a sine wave shape and oscillated.
  • both the coarse coating roll pre-nozzle nozzle 3a and the pre-coating roll nozzle 3b have the pitch T shown in FIG.
  • At least one of the nozzle before rough coating roll 3a and the nozzle before coating roll 3b is set to a pitch T of 2 to 120. It can be seen that by applying the annealing separator slurry 4 while being swung as seconds, shape defects do not occur in the grain-oriented electrical steel sheet. Accordingly, it can be seen that the pitch T in the oscillation of the slurry supply nozzle 3 is preferably 2 to 120 seconds.
  • Example 31 to 36 and Comparative Example 2 In Examples 31 to 36 and Comparative Example 2, first, a cold rolled sheet of a grain-oriented electrical steel sheet having a final sheet thickness of 0.23 mm containing 3.4% by weight of silicon (Si) is used as the strip 1. And after performing decarburization annealing with respect to this strip
  • the coating amount of the annealing separator slurry 4 per one surface is oxidized on both surfaces of the strip 1 by setting the coating amount of the annealing separator slurry 4 per side to 7.0 g / m 2 by the nozzle 3a before the rough coating roll and the nozzle 3b before the coating roll. Apply magnesium (MgO). Then, after winding the strip
  • the effect of swinging the coating nozzle of the annealing separator slurry 4 in the present invention in the steel plate width direction is to disperse minute fluctuations in the coating amount of the annealing separator slurry 4 due to the arrangement of the coating nozzles in the steel plate width direction. This is to promote the homogenization of the coating amount of the annealing separator slurry 4 on the steel plate. Furthermore, since this steel sheet is wound after application of the annealing separator slurry 4 to form a coil, the combination of the coating amount on the steel sheet of the annealing separator slurry 4 adjacent to or adjacent to the radial direction of this coil is made constant. It is considered more desirable to do so.
  • the coating nozzle of the annealing separator slurry 4 is not swung for one cycle every one turn pitch, but is swung for one cycle every two turn pitches.
  • the present inventors have found that there is a possibility that the total amount of the annealing separator slurry 4 applied between the layers of the coiled steel sheet may be further homogenized in the width direction of the steel sheet.
  • the ratio (V / 2L) of the line speed V of the strip 1 to twice the turn pitch L of the coil 10 is defined as the turn pitch frequency (unit: [Hz]).
  • the line speed V and the coil diameter of the coil 10 were set so that the turn pitch frequency was 0.665 Hz.
  • the oscillation separating agent slurry 4 was applied to the surface of the strip 1 by changing the oscillation frequency of the nozzle 3a before the rough application roll within a range of 0.010 Hz to 1.000 Hz.
  • fluctuation amount of the nozzle 3a before a rough application roll was controlled to the sine wave form.
  • Comparative Example 2 the annealing separator slurry 4 was applied to the surface of the strip 1 without swinging the nozzle 3a before the rough application roll, as in the prior art.
  • Table 2 shows the inspection results of the shape defects of the band 1 in each of the above Examples 31 to 36 and Comparative Example 2.
  • Example 31 to 36 the result in the case where the turn pitch frequency is 0.665 Hz is shown. However, even if the turn pitch frequency is a value other than 0.665 Hz, the oscillation of the nozzle 3a before the rough coating roll is performed. By bringing the frequency closer to the turn pitch frequency, the same result as that obtained when the turn pitch frequency was 0.665 Hz was obtained.
  • the turn pitch frequency was set based on twice the turn pitch as described above, and the oscillation of the pre-coating roll nozzle 3a was controlled based on this turn pitch frequency.
  • the turn pitch frequency was set based on coating conditions based on such a concept, that is, an even multiple of the turn pitch. The same effect was obtained when the rough coating roll pre-nozzle 3a was swung according to the turn pitch frequency.
  • the slurry supply nozzle 3 is arranged in the width direction of the strip 1.
  • the unevenness of the film thickness distribution of the annealing separator slurry 4 along the width direction can be made smooth, or even when the strip 1 is wound up to form the coil 10, Can be prevented.
  • the slurry discharge means such as the slurry supply nozzle 3 is swung relative to the band 1 along the width direction of the band 1 so that the band 1 and the slurry discharge means
  • the annealing separator slurry 4 was supplied to the band 1 while changing the relative positional relationship with the time along the width direction of the band 1.
  • the belt-like body 1 is swung relative to the slurry discharge means along the width direction of the belt-like body 1 so that the belt-like body 1 and the slurry discharge means are relatively moved.
  • the annealing separator slurry 4 is supplied to the band 1 while changing the positional relationship along the width direction of the band 1 over time.
  • FIG. 8 is a diagram illustrating a configuration example of the slurry applying apparatus according to the second embodiment of the present invention.
  • the slurry applying apparatus 30 is an apparatus that applies an annealing separator slurry to a steel plate, and includes a squeeze roll 12, a slurry supply nozzle 13, and a belt-like body transport roll 15. .
  • the slurry supply nozzle 13 is a slurry discharge means having a plurality of discharge ports for supplying the annealing separator slurry 4 to the strip 1 that is a grain-oriented electrical steel sheet.
  • the squeeze roll 12 is a pair of coating means that sandwich the strip 1 in the thickness direction and squeeze the annealing separator slurry 4 applied on the strip 1 to a predetermined thickness.
  • the belt-shaped body transporting roll 15 is a belt-shaped body transporting unit configured to be able to transport the belt-shaped body 1 by rotating around the center axis of a circle in the column, for example, in a cylindrical shape. .
  • the squeeze roll 12 and the belt-like body transporting roll 15 in the second embodiment are substantially parallel to the surface of the belt-like body 1 and substantially perpendicular to the traveling direction of the belt-like body 1, That is, the strip-shaped body swinging means is configured to be able to swing the strip-shaped body 1 relative to the slurry discharge means in the width direction of the strip-shaped body 1.
  • the slurry supply nozzle 13 discharges and supplies the annealing separator slurry 4 to the surface of the strip 1.
  • the squeeze roll 12 is pressed while holding the strip 1 in its thickness direction, and the annealing separator slurry 4 applied to the surface of the strip 1 is squeezed to a predetermined thickness.
  • the strip 1 is subjected to various processes such as a finish annealing process (secondary recrystallization annealing process), a coating process, and a flattening annealing process, and finally becomes a product of an electromagnetic steel sheet.
  • the present inventors examined the saddle-like shape defect formed on the surface of the strip 1 after the flattening annealing step, as in the first embodiment. As a result, the present inventors have found that a certain correlation is recognized between the generation position along the width direction of the strip 1 and the installation position along the width direction of the slurry supply nozzle 13 with respect to the shape defect. I found out. Then, the inventors pay attention to the fact that the film thickness of the annealing separator slurry 4 has a non-uniform distribution along the width direction of the strip 1, and this film thickness distribution affects the shape defect. I came to remember.
  • the film thickness of the annealing separator slurry 4 is determined by the slurry supply nozzle. 103 becomes larger at a position close to each of the discharge ports, and becomes smaller at a position far away. For this reason, in the conventional slurry coating apparatus 100, as described above, the film thickness distribution of the annealing separator slurry 4 along the width direction of the strip 1 and the annealing separator slurry 4 along the longitudinal direction of the strip 1. The film thickness distribution was controlled.
  • the thickness difference of the film thickness of the annealing separator slurry 4 on the surface of the strip 1 is within a predetermined range.
  • the thickness difference of the film thickness of the annealing separator slurry 4 falls within a predetermined range as described above, the occurrence of the above-described bowl-shaped shape defect cannot be avoided.
  • the application unevenness of the annealing separator slurry 4 composed of a crest portion having a relatively large film thickness and a trough portion having a relatively small film thickness is as described above. Since this is caused by the position of the discharge port, it is considered to be an inevitable phenomenon.
  • the present inventors conducted further intensive studies, and further examined the influence of uneven application of the annealing separator slurry 4 on the occurrence of shape defects. As a result, the present inventors completely suppress the occurrence of non-uniform film thickness distribution of the annealing separator slurry 4 along the width direction of the strip 1 that is unavoidable, as in the first embodiment. If it is possible to make the film thickness distribution as gentle as possible or to suppress the build-up when the strip 1 is made into a coil, assuming that a non-uniform film thickness distribution occurs, Recalling that the occurrence can be suppressed.
  • the slurry application device 30 causes the band 1 to be parallel to the surface of the band 1 by the squeeze roll 12 and the band transport roll 15.
  • a configuration is adopted in which the slurry supply nozzle 13 is swung relative to the direction perpendicular to the traveling direction of the strip 1, that is, along the width direction of the strip 1.
  • the squeeze roll 12 and the belt-like body transporting roll 15 swing the belt-like body 1 relative to the slurry supply nozzle 13 along the width direction of the belt-like body 1, and the slurry supply nozzle 13 discharges and supplies the annealing separator slurry 4 to the surface of the belt-like body 1 that travels with this rocking motion.
  • the slurry supply nozzle 13 changes the relative positional relationship between the discharge port and the strip 1 along the width direction of the strip 1 over time, while annealing separator slurry with respect to the strip 1. 4 can be supplied.
  • FIG. 9A, FIG. 9B, and FIG. 9C each show an example of the change over time of the swing amount in the swing control for the strip 1 when the strip 1 is swung by the squeeze roll 12 and the strip transport roll 15. It is a graph.
  • FIG. 10 shows the slurry coating apparatus according to Embodiment 2 of the present invention and the film thickness distribution of the annealing separator slurry on the surface of the band when the band is subjected to sine wave swing control.
  • the squeeze roll 12 and the belt-like body transporting roll 15 swing the belt-like body 1 along the width direction in a sine wave shape as shown in FIG. 9A or in a triangular wave shape as shown in FIG. 9B. .
  • the film thickness of the annealing separator slurry 4 along the width direction of the strip 1 can be understood by comparing the broken line portion and the solid line portion shown in the graph of the film thickness distribution of the annealing separator slurry 4 in FIG.
  • the distribution is gentle compared to the conventional case (see the broken line portion in the graphs of FIGS. 2 and 10) in which the annealing separator slurry 4 is discharged in a state where the belt-like body 1 is conveyed without being swung. Become.
  • the rocking width of the strip 1 shown in FIG. 10 is about 1 ⁇ 2 of the interval between the adjacent discharge ports of the slurry supply nozzle 13.
  • the supply of the annealing separator slurry 4 can be averaged with respect to the width direction of the strip 1 between the plurality of discharge ports of the slurry supply nozzle 13.
  • the pitch T as the oscillation period of the strip 1 shown in FIGS. 9A and 9B is preferably 1 to 150 seconds, and preferably 2 to 120 seconds. Accordingly, as shown in FIG. 10, the annealing separator slurry 4 is gently applied to the surface of the strip 1 and annealed as compared to the non-uniformity of the film thickness distribution of the annealing separator slurry 4 shown in FIG. Valleys and peaks of the separating agent slurry 4 are gently formed. Therefore, the thickness difference in the film thickness distribution of the annealing separator slurry 4 is relaxed, and as a result, the occurrence of shape defects on the surface of the strip 1 can be prevented.
  • the triangular wave-like folded end has a substantially triangular wave-like waveform. Or a trapezoidal wave when stopped at this end for a finite period of time, these oscillations are also included in the triangular wave oscillation.
  • FIG. 11A shows the slurry coating apparatus according to Embodiment 2 of the present invention and the film thickness distribution of the annealing separator slurry on the surface of the band when the band-shaped rocking control is performed on the band.
  • FIG. FIG. 11A shows two layers of the annealing separator slurry 4 on the surface of the band 1 when the swing control is performed on the band 1 based on the configuration diagram of the slurry application device 30 and the graph shown in FIG. 9C. And a graph showing the film thickness distribution.
  • FIG. 11B is a partially enlarged cross-sectional view of a state in which a strip-like body coated with the annealing separator slurry in Embodiment 2 of the present invention is coiled.
  • FIG. 11B shows a coil corresponding to FIG. 3B when the surface of the strip 1 is coated with the annealing separator slurry 4 as shown in FIG. 11A and then wound into a coil to form the coil 10 shown in FIG. 3A.
  • Ten stacked structures are shown.
  • the swinging width of the belt-like body 1 is about 1 ⁇ 2 of the interval between adjacent discharge ports among the plurality of discharge ports of the slurry supply nozzle 13.
  • the pitch T which is the oscillation cycle of the strip 1 shown in FIG. 9C, is preferably 1 to 150 seconds, and preferably 2 to 120 seconds. This is because if the pitch T in the case of controlling the change in the amount of fluctuation of the strip 1 in a rectangular wave shape is too shorter than 1 second, the film thickness distribution of the annealing separator slurry 4 as shown in FIG. If it remains and is longer than 150 seconds, the amount of deviation per turn when the strip 1 is used as the coil 10 is small, and the peaks and valleys of the annealing separator slurry 4 are appropriately overlapped between the two layers. This is because the build-up shown in FIG. 3B occurs.
  • the moving speed of the strip 1 is finite and it is difficult to move the strip 1 instantaneously along its width direction. Therefore, the oscillation of the strip 1 itself has a substantially trapezoidal wave shape, but such control of the oscillation is also included in the rectangular wave oscillation.
  • the peaks and valleys in the film thickness distribution of the annealing separator slurry 4 are sequentially along the radial direction of the circle of the cross section along the longitudinal direction of the strip 1 in the coil 10. Since the layers are alternately stacked, the build-up described above can be prevented. Therefore, it is possible to suppress the occurrence of a shape defect in the band 1.
  • FIG. 12A, FIG. 12B, and FIG. 12C are configuration diagrams respectively showing a first modification, a second modification, and a third modification of the slurry applying apparatus according to the second embodiment.
  • the slurry coating apparatus 31 includes a pair of rough coating rolls 12a, a pair of backup rolls 12b, a pair of coating rolls 12c, and a pair of rough coatings. It has a pre-roll nozzle 13a.
  • the pair of pre-rough application roll nozzles 13 a are a pair of slurry discharge means for discharging the annealing separator slurry 4 to both surfaces of the strip 1.
  • the pair of rough coating rolls 12a presses (nips) the belt-shaped body 1 while gripping the belt-shaped body 1 in the thickness direction, and roughens the annealing separator slurry 4 supplied by the nozzle 13a before the rough coating roll on both surfaces of the belt-shaped body 1. It is a pair of application means to apply.
  • the pair of application rolls 12c are supported by a pair of backup rolls 12b provided on both sides of the strip 1 and are pressed (sandwiched) while gripping the strip 1 in the thickness direction to perform rough coating annealing. It is a second pair of application means for squeezing the separating agent slurry 4.
  • belt-shaped object conveyance roll (not shown), the rough application roll 12a and the application
  • it is configured to be able to swing relative to the pre-rough coating roll nozzle 13 a along the width direction of the band 1 (in FIG. 12A, the direction perpendicular to the paper surface). While such a belt-like body swinging means swings the belt-like body 1 relative to the coarse coating roll pre-nozzle 13a along the width direction of the belt-like body 1, the coarse coating roll pre-roller nozzle 13a swings.
  • the annealing separator slurry 4 is discharged and supplied to both surfaces of the strip 1 that travels with the belt. Thereby, the nozzle 13a before the rough coating roll is annealed and separated from the strip 1 while changing the relative positional relationship between the discharge port and the strip 1 along the width direction of the strip 1 over time.
  • the agent slurry 4 can be supplied.
  • the slurry application device 32 according to the second modification of the second embodiment has the same configuration as the slurry application device 31 according to the first modification described above, and A second slurry is formed on one surface side of the strip 1 along the traveling direction of the strip 1 on the downstream side of the pre-rough coating roll nozzle 13a as the slurry discharge means and the upstream of the pair of coating rolls 12c. It has a pre-application roll nozzle 13b as a discharge means. Also in the slurry coating device 32, the belt-shaped body 1 is provided with a belt-shaped body transporting roll (not shown), the rough coating roll 12a and the coating roll 12c, and, if necessary, the backup roll 12b.
  • Such a belt-like body swinging means swings the belt-like body 1 relative to the coarse coating roll pre-nozzle 13 a and the coating roll pre-nozzle 13 b along the width direction of the strip 1, while the coarse coating roll pre-nozzle 13a and the nozzle 13b before the application roll discharge and supply the annealing separator slurry 4 to both surfaces or one surface of the strip 1 that travels with this swing.
  • the pre-rough application roll nozzle 13a and the pre-application roll nozzle 13b change the relative positional relationship between the discharge port and the belt 1 along the width direction of the belt 1 over time, An annealing separator slurry 4 can be supplied to the body 1.
  • either the pre-rough application roll nozzle 13a or the pre-application roll nozzle 13b is swung integrally with the squeeze roll, that is, the rough application roll. Only one of the front nozzle 13a and the application roll front nozzle 13b may swing relative to the band 1.
  • the slurry application device 33 according to the third modification of the second embodiment has the same configuration as the slurry application device 31 according to the first modification described above, and A post-application-roll nozzle 13c as a second slurry discharge means is provided on the other surface side of the band-like body 1 on the downstream side of the pair of application rolls 12c along the traveling direction of the band-like body 1.
  • the belt-shaped body 1 is a strip-shaped body conveying roll (not shown), the rough coating roll 12a and the coating roll 12c, and, if necessary, the backup roll 12b as the belt-shaped body rocking means.
  • Such a belt-like body swinging means swings the belt-like body 1 relative to the coarse coating roll pre-nozzle 13a and the post-coating roll post-nozzle 13c along the width direction of the belt-like body 1, while the coarse coating roll pre-nozzle nozzle. 13a and the nozzle 13c after an application roll discharge and supply the annealing separation agent slurry 4 to both surfaces or one surface of the strip 1 that travels with this swing.
  • the nozzle 13a before the rough application roll and the nozzle 13c after the application roll change the relative positional relationship between the discharge port and the band 1 along the width direction of the band 1 with time, and change the band shape.
  • An annealing separator slurry 4 can be supplied to the body 1.
  • either the pre-coating roll nozzle 13a or the post-coating roll nozzle 13c is swung integrally with the squeeze roll, that is, the rough coating roll. Only one of the front nozzle 13a and the post-application roll nozzle 13c may swing relative to the band 1.
  • Example 37 to 51 and Comparative Example 3 In Examples 37 to 51 and Comparative Example 3, first, a cold-rolled sheet of grain-oriented electrical steel sheet having a final sheet thickness of 0.3 mm containing 3.4% by weight of silicon (Si) was used as the strip 1. And after performing decarburization annealing with respect to this strip
  • the coating amount of the annealing separator slurry 4 per one surface is oxidized on both surfaces of the strip 1 by setting the coating amount of the annealing separator slurry 4 per one side to 7.0 g / m 2 by the nozzle 13a before the rough coating roll and the nozzle 13b before the coating roll. Apply magnesium (MgO). Then, after winding the strip
  • the swing control of the strip 1 when the annealing separator slurry 4 is applied to the surface of the strip 1 is performed as follows.
  • the pitch T shown in FIG. 9A is set to 1 second, 2 seconds, 60 seconds, 120 seconds, and 150 seconds, respectively, and swing control is performed on the strip 1 in a sinusoidal shape.
  • the pitch T shown in FIG. 9B is set to 1 second, 2 seconds, 60 seconds, 120 seconds, and 150 seconds, respectively, and swing control is performed on the strip 1 in a triangular wave shape.
  • the belt T is controlled to be swung in a rectangular wave shape with the pitch T shown in FIG. 9C set to 1 second, 2 seconds, 60 seconds, 120 seconds, and 150 seconds, respectively.
  • the annealing separator slurry 4 is applied to the surface of the band 1 without causing the band 1 to swing as in the conventional example.
  • Table 3 is a table showing the results of Examples 37 to 51 and Comparative Example 3 described above.
  • the annealing separator slurry 4 was applied with the pitch T set to 2 to 120 seconds while the strip 1 was swung.
  • the pitch T in the swing control for the band 1 is preferably 2 to 120 seconds.
  • Example 52 to 57 and Comparative Example 4 In Examples 52 to 57 and Comparative Example 4, first, a cold-rolled sheet of grain-oriented electrical steel sheet having a final sheet thickness of 0.23 mm containing 3.4% by weight of silicon (Si) is used as the strip 1. And after performing decarburization annealing with respect to this strip
  • the coating amount of the annealing separator slurry 4 per one surface is oxidized on both surfaces of the strip 1 by setting the coating amount of the annealing separator slurry 4 per one side to 7.0 g / m 2 by the nozzle 13a before the rough coating roll and the nozzle 13b before the coating roll. Apply magnesium (MgO). Then, after winding the strip
  • the effect of swinging the strip 1 in the width direction of the steel plate by the strip swinging means in the present invention is that a minute variation in the coating amount of the annealing separator slurry 4 due to the arrangement of the coating nozzle is caused by the strip 1.
  • By dispersing in the width direction of the steel sheet it is to promote the uniform application amount of the annealing separator slurry 4 on the strip 1.
  • belt-shaped body 1 is wound up after application
  • the belt-like body 1 is not swung for one cycle every one turn pitch, but is swung for one cycle every two turn pitches.
  • the present inventors have found that there is a possibility that the total amount of the annealing separator slurry 4 applied between the layers of the coiled steel sheet may be further homogenized in the width direction of the steel sheet.
  • the ratio (V / 2L) of the line speed V of the strip 1 to twice the turn pitch L of the coil 10 is defined as the turn pitch frequency (unit: [Hz]).
  • the line speed V and the coil diameter of the coil 10 were set so that the turn pitch frequency was 0.665 Hz.
  • the swinging frequency of the strip 1 was changed within the range of 0.010 Hz to 1.000 Hz, and the annealing separator slurry 4 was applied to the surface of the strip 1.
  • belt-shaped body 1 was controlled to the sine wave shape.
  • Comparative Example 4 the annealing separator slurry 4 was applied to the surface of the strip 1 without swinging the strip 1 as in the prior art.
  • Table 4 shows the inspection results of the shape defects of the band 1 in each of the above Examples 52 to 57 and Comparative Example 4.
  • the strip 1 (orientated electrical steel sheet) does not have any shape defects or is reduced as compared with the prior art. Further, in Examples 52 to 54, when the oscillation frequency of the strip 1 is close to the turn pitch frequency, that is, the same value as or close to 0.665 Hz, the shape defect of the strip 1 does not occur. I understand. On the other hand, in Comparative Example 4, it can be seen that the shape defect of the belt-like body 1 occurs.
  • Examples 52 to 57 the time change of the swing amount of the belt-like body 1 was controlled in a sine wave shape, but even when this time change of the swing amount is controlled in a rectangular wave shape or a triangular wave shape, There was no difference in the inspection result of the shape defect of the band 1.
  • Example 52 to 57 the result in the case where the turn pitch frequency is 0.665 Hz is shown. However, even if the turn pitch frequency is a value other than 0.665 Hz, the oscillation frequency of the strip 1 is turned. By approaching the pitch frequency, the same result as that obtained when the turn pitch frequency was 0.665 Hz was obtained.
  • the turn pitch frequency was set based on twice the turn pitch as described above, and the oscillation of the strip 1 was controlled based on this turn pitch frequency.
  • the turn pitch frequency was set based on the coating conditions based on such a concept, that is, an even multiple of the turn pitch. The same effect was obtained when the strip 1 was swung in accordance with the turn pitch frequency.
  • the strip 1 when the annealing separator slurry 4 is applied to the surface of the strip 1, the strip 1 is moved along the width direction by the strip transport roll 15 and the squeeze roll 12.
  • the strip transport roll 15 and the squeeze roll 12 To make the unevenness of the film thickness distribution of the annealing separator slurry 4 along the width direction smooth, or to prevent build-up when the strip 1 is wound up to form the coil 10. can do.
  • the yield in the manufacture of the steel sheet can be improved.
  • first and second embodiments of the present invention have been specifically described above, the present invention is not limited to the above-described first and second embodiments, and various modifications based on the technical idea of the present invention. Is possible.
  • the numerical values given in the first and second embodiments are merely examples, and different numerical values may be used as necessary.
  • the pitch T when the slurry supply nozzle 3 is controlled to be sinusoidal or rectangular wave is set to 2 to 120 seconds, or the oscillation frequency of the coating nozzle is adjusted in accordance with the turn pitch of the coil 10.
  • the pitch T in the case where the swing control is performed on the strip 1 in a sine wave shape, a triangular wave shape, or a rectangular wave shape is set to 2 to 120 seconds, or the turn pitch of the coil 10 is set.
  • the oscillation frequency of the strip 1 is set to a predetermined value (for example, 0.665 Hz), but the period and frequency are varied according to the line speed of the strip 1 and the position after winding of the coil 10. It is also possible to make the value variable.
  • the slurry coating apparatus and the slurry coating method according to the present invention are useful for coating a slurry such as an annealing separator on the surface of a steel sheet, and particularly improve the yield of steel sheet production by suppressing the shape failure of the steel sheet. Suitable for doing.

Abstract

A slurry coating device which is one embodiment of the present invention is for coating a slurry (4) onto a band-shaped body (1) that travels, and is provided with a slurry discharge means (3) configured so as to be able to provide the slurry (4) to the band-shaped body (1). This slurry coating device is roughly parallel to the surface of the band-shaped body, and in a direction roughly perpendicular to the travel direction of the band-shaped body (1), the slurry coating device causes the relative positional relationship between the slurry discharge means (3) and the band-shaped body (1) to change and provides the slurry (4) to the band-shaped body (1) using the slurry discharge means (3).

Description

スラリー塗布装置およびスラリー塗布方法Slurry coating apparatus and slurry coating method
　本発明は、方向性電磁鋼板を巻き取ったコイルに対して高温焼鈍を行う際の焼き付きを防止するための焼鈍分離剤のスラリーを、方向性電磁鋼板に塗布するスラリー塗布装置およびスラリー塗布方法に関する。 The present invention relates to a slurry coating apparatus and a slurry coating method for coating a slurry of an annealing separator for preventing seizure when performing high temperature annealing on a coil wound with a grain-oriented electrical steel sheet to the grain-oriented electrical steel sheet. .
　従来、方向性電磁鋼板は、主にトランス、発電機、およびその他の電気機器の鉄心材料として用いられる。そのため、方向性電磁鋼板は、磁気特性（鉄損）が良好であることに加え、その表面被膜が良好であることが要求されている。 Conventionally, grain-oriented electrical steel sheets are mainly used as iron core materials for transformers, generators, and other electrical equipment. Therefore, the grain-oriented electrical steel sheet is required to have a good surface coating in addition to good magnetic properties (iron loss).
　この鋼板の表面被膜は、フォルステライト被膜と称されるセラミック被膜からなる。フォルステライト被膜を形成する際には、まず、冷間圧延により所定の板厚に圧延したものを素材として、この素材に下地となる酸化シリコン（ＳｉＯ2）を主成分とした酸化膜（サブスケール）を形成する。次に、この酸化膜上に酸化マグネシウム（ＭｇＯ）を塗布した後、鋼板をコイル状に巻き取る。その後、仕上げ焼鈍工程において、コイル状の方向性電磁鋼板に対して１０００℃以上の高温による熱処理を行う。これにより、鋼板の表面においてＳｉＯ2とＭｇＯとが反応してフォルステライト被膜（Ｍｇ2ＳｉＯ4膜）が形成される。なお、鋼板の表面に塗布されたＭｇＯは、仕上げ焼鈍工程においてコイル層間の密着を防止するための密着防止剤にもなるので、焼鈍分離剤とも称される。仕上げ焼鈍工程後は、鋼板に対してフラットニング焼鈍（平坦化焼鈍）を行うことにより、鋼板の形状を矯正して製品とする。 The surface coating of the steel plate is made of a ceramic coating called a forsterite coating. When forming a forsterite film, first, a material that has been rolled to a predetermined thickness by cold rolling is used as a raw material, and an oxide film (subscale) containing silicon oxide (SiO 2 ) as a base material for this material. ). Next, after applying magnesium oxide (MgO) on the oxide film, the steel sheet is wound into a coil shape. Thereafter, in the finish annealing step, the coiled grain-oriented electrical steel sheet is heat-treated at a high temperature of 1000 ° C. or higher. Thereby, SiO 2 and MgO react on the surface of the steel sheet to form a forsterite film (Mg 2 SiO 4 film). In addition, since MgO applied to the surface of the steel sheet also serves as an adhesion preventing agent for preventing adhesion between coil layers in the final annealing process, it is also referred to as an annealing separator. After the finish annealing step, the steel sheet is flattened (planarized) to correct the shape of the steel sheet to obtain a product.
　また、このＭｇＯなどの焼鈍分離剤は、一般に、水に懸濁させてスラリーとされる。そして、脱炭焼鈍工程における連続焼鈍炉の出側において、供給ノズルおよびスクイーズロールが、このスラリーを帯状体の上面および下面の両面に所定の膜厚になるように塗布する。このとき、帯状体の上面側には、スクイーズロールの入側に液溜まりが形成されることも多い。続いて、乾燥炉において焼鈍分離剤を乾燥させた後、帯状体を巻き取ってコイルとする。 Further, this annealing separator such as MgO is generally suspended in water to form a slurry. Then, on the exit side of the continuous annealing furnace in the decarburization annealing step, the supply nozzle and the squeeze roll apply this slurry so as to have a predetermined film thickness on both the upper surface and the lower surface of the strip. At this time, a liquid pool is often formed on the entrance side of the squeeze roll on the upper surface side of the belt-like body. Subsequently, after the annealing separator is dried in a drying furnace, the strip is wound to obtain a coil.
　従来、これらの供給ノズルおよびスクイーズロールは、特許文献１に記載されているように、供給ノズルによって帯状体にスラリーを供給した後、粗塗布ロールおよび塗布ロールなどのスクイーズロールによってスラリーの膜厚を調整可能に配置される。なお、膜厚の要求精度や設置スペースの制約によって、粗塗布ロールと塗布ロールとの一方のみが設置されている場合や、粗塗布ロールと塗布ロールとの間にさらにノズルを設け、このノズルによってスラリーを供給するように供給ノズルおよびスクイーズロールが構成されている場合もある。 Conventionally, these supply nozzles and squeeze rolls, as described in Patent Document 1, supply the slurry to the belt-like body by the supply nozzle, and then adjust the film thickness of the slurry by squeeze rolls such as a rough application roll and an application roll. Adjustable arrangement. Depending on the required accuracy of the film thickness and the installation space, only one of the coarse application roll and the application roll is installed, or a nozzle is further provided between the coarse application roll and the application roll. A supply nozzle and a squeeze roll may be configured to supply the slurry.
　また、特許文献２に記載のように、帯状体がすべての塗布ロールを通過した後に、供給ノズルによって帯状体にスラリーを供給する場合もある。この場合、スラリーを供給するノズルは、帯状体の走行方向に対して直角方向となる幅方向に、数１００ｍｍの間隔で複数個設置される。 Also, as described in Patent Document 2, there is a case where the slurry is supplied to the band by the supply nozzle after the band has passed through all the application rolls. In this case, a plurality of nozzles for supplying the slurry are installed at intervals of several hundred mm in the width direction that is perpendicular to the traveling direction of the strip.
特開２００４－５７９７１号公報JP 2004-57971 A 特開昭６２－６７１１８号公報JP-A-62-67118
　ところで、上述した鋼板の製造工程における平坦化焼鈍後に、鋼板である帯状体に、その長手方向に平行な皺状の形状不良が発生することがあった。帯状体において、このような形状不良が発生した部分は、製品にならないため、切り捨てる必要がある。そのため、形状不良の発生は、鋼板の製造において歩留まりの低下を招いてしまう。ところが、この皺状の形状不良が発生するメカニズムの詳細は明らかではなく、この皺状の形状不良の発生を抑制する技術の開発が求められていた。 By the way, after the flattening annealing in the manufacturing process of the steel plate described above, a saddle-like shape defect parallel to the longitudinal direction may occur in the belt-like body that is a steel plate. In the belt-like body, the portion where such a shape defect has occurred does not become a product, so it must be discarded. For this reason, the occurrence of shape defects leads to a decrease in yield in the production of steel sheets. However, the details of the mechanism by which this saddle-shaped defect occurs are not clear, and the development of a technique for suppressing the occurrence of this saddle-shaped defect has been demanded.
　本発明は、上記に鑑みてなされたものであって、その目的は、鋼板の製造において平坦化焼鈍後に生じやすい、鋼板の長手方向に沿った皺状の形状不良の発生を抑制することができ、鋼板の製造における歩留まりを向上することができるスラリー塗布装置およびスラリー塗布方法を提供することにある。 The present invention has been made in view of the above, and the object thereof is to suppress the occurrence of saddle-like shape defects along the longitudinal direction of a steel sheet, which are likely to occur after flattening annealing in the manufacture of a steel sheet. An object of the present invention is to provide a slurry coating apparatus and a slurry coating method capable of improving the yield in the production of steel sheets.
　上述した課題を解決し、上記目的を達成するために、本発明に係るスラリー塗布装置は、走行する帯状体に対してスラリーを塗布するスラリー塗布装置において、前記帯状体に前記スラリーを供給可能に構成されたスラリー吐出手段を備え、前記帯状体の面に概ね平行で且つ前記帯状体の走行方向に対して概ね直角な方向に、前記スラリー吐出手段と前記帯状体との相対的な位置関係を変化させつつ、前記スラリー吐出手段によって前記帯状体に前記スラリーを供給することを特徴とする。 In order to solve the above-described problems and achieve the above object, a slurry application apparatus according to the present invention is capable of supplying the slurry to the belt-like body in a slurry application device that applies slurry to a traveling belt-like body. The slurry discharge means is configured, and the relative positional relationship between the slurry discharge means and the band is approximately parallel to the surface of the band and substantially perpendicular to the traveling direction of the band. The slurry is supplied to the belt-like body by the slurry discharge means while being changed.
　また、本発明に係るスラリー塗布装置は、上記の発明において、前記帯状体を把持しつつ押圧して、供給された前記スラリーを前記帯状体の表面に塗布可能に構成された一対の塗布手段を備え、前記スラリー吐出手段が、前記帯状体の面に概ね平行で且つ前記帯状体の走行方向に対して概ね直角な方向に、前記帯状体に対し相対的に揺動可能に構成されることを特徴とする。 Further, the slurry application apparatus according to the present invention includes a pair of application means configured to apply the slurry to the surface of the belt-like body by pressing the belt-like body while pressing the belt-like body. The slurry discharge means is configured to be able to swing relative to the strip in a direction substantially parallel to the surface of the strip and substantially perpendicular to the traveling direction of the strip. Features.
　また、本発明に係るスラリー塗布装置は、上記の発明において、前記スラリー吐出手段が、前記一対の塗布手段に対して前記帯状体の走行方向に沿った上流側に設けられているとともに、前記一対の塗布手段に対して前記帯状体の走行方向に沿った下流側に、前記帯状体に前記スラリーを供給可能に構成された第２のスラリー吐出手段が設けられていることを特徴とする。 Further, in the slurry application apparatus according to the present invention, in the above invention, the slurry discharge means is provided on the upstream side in the traveling direction of the belt-like body with respect to the pair of application means. A second slurry discharge means configured to be able to supply the slurry to the band-like body is provided on the downstream side in the traveling direction of the band-like body with respect to the coating means.
　また、本発明に係るスラリー塗布装置は、上記の発明において、前記第２のスラリー吐出手段が、前記帯状体の面に概ね平行で且つ前記帯状体の走行方向に対して概ね直角な方向に、前記帯状体に対し相対的に揺動可能に構成されていることを特徴とする。 Further, in the slurry applying apparatus according to the present invention, in the above invention, the second slurry discharge means is substantially parallel to the surface of the belt and in a direction substantially perpendicular to the traveling direction of the belt. It is configured to be able to swing relative to the belt-like body.
　また、本発明に係るスラリー塗布装置は、上記の発明において、前記スラリー吐出手段が、前記一対の塗布手段に対して前記帯状体の走行方向に沿った下流側に設けられているとともに、前記一対の塗布手段に対して前記帯状体の走行方向に沿った上流側に、前記帯状体に前記スラリーを供給可能に構成された第３のスラリー吐出手段が設けられていることを特徴とする。 In the slurry application apparatus according to the present invention, in the above invention, the slurry discharge means is provided on the downstream side in the traveling direction of the belt-like body with respect to the pair of application means. 3rd slurry discharge means comprised so that supply of the said slurry to the said strip | belt body is provided in the upstream along the running direction of the said strip | belt body with respect to this application | coating means, It is characterized by the above-mentioned.
　また、本発明に係るスラリー塗布装置は、上記の発明において、前記揺動における揺動量の時間変化が、矩形波状、正弦波状、または三角形波状であることを特徴とする。 Further, the slurry coating apparatus according to the present invention is characterized in that, in the above invention, the temporal change of the swing amount in the swing is a rectangular wave shape, a sine wave shape, or a triangular wave shape.
　また、本発明に係るスラリー塗布装置は、上記の発明において、前記スラリー吐出手段を保持する当該スラリー塗布装置ごと、前記帯状体に対し相対的に揺動可能に構成されていることを特徴とする。 The slurry coating apparatus according to the present invention is characterized in that, in the above invention, the slurry coating apparatus that holds the slurry discharge means is configured to be swingable relative to the belt-like body. .
　また、本発明に係るスラリー塗布装置は、上記の発明において、前記スラリー吐出手段の揺動周波数が、前記帯状体を巻き取ってなるコイルのターンピッチをもとに設定されることを特徴とする。 In the slurry application apparatus according to the present invention, in the above invention, the oscillation frequency of the slurry discharge means is set based on a turn pitch of a coil formed by winding the strip. .
　また、本発明に係るスラリー塗布装置は、上記の発明において、前記スラリー吐出手段の揺動周波数が、前記ターンピッチの偶数倍をもとに設定されることを特徴とする。 Further, the slurry coating apparatus according to the present invention is characterized in that, in the above invention, the oscillation frequency of the slurry discharge means is set based on an even multiple of the turn pitch.
　また、本発明に係るスラリー塗布装置は、上記の発明において、前記帯状体の面に概ね平行で且つ前記帯状体の走行方向に対して概ね直角な方向に、前記帯状体を前記スラリー吐出手段に対し相対的に揺動可能に構成された帯状体揺動手段と、前記帯状体を把持しつつ押圧して、供給された前記スラリーを前記帯状体の表面に塗布可能に構成された一対の塗布手段と、を備えることを特徴とする。 In the slurry application apparatus according to the present invention, in the above invention, the belt-like body is disposed on the slurry discharge means in a direction substantially parallel to the surface of the belt-like body and substantially perpendicular to the traveling direction of the belt-like body. A strip-shaped body swinging means configured to be relatively swingable, and a pair of coating units configured to be able to apply the supplied slurry to the surface of the strip-shaped body by pressing and holding the strip-shaped body And means.
　また、本発明に係るスラリー塗布装置は、上記の発明において、前記一対の塗布手段に対して前記帯状体の走行方向に沿った下流側に、前記帯状体を把持しつつ押圧して、前記スラリーを前記帯状体の表面に塗布可能に構成された第２の一対の塗布手段が設けられていることを特徴とする。 Moreover, the slurry application apparatus according to the present invention is the slurry application apparatus according to the above invention, wherein the slurry is pressed against the pair of application means on the downstream side along the traveling direction of the band-like body while holding the band-like body. Is provided on the surface of the belt-like body in a second pair of application means.
　また、本発明に係るスラリー塗布装置は、上記の発明において、前記一対の塗布手段に対して前記帯状体の走行方向に沿った下流側に、前記帯状体に前記スラリーを供給可能に構成された第２のスラリー吐出手段が設けられていることを特徴とする。 Further, in the above invention, the slurry coating apparatus according to the present invention is configured to be capable of supplying the slurry to the strip on the downstream side along the traveling direction of the strip with respect to the pair of coating means. A second slurry discharge means is provided.
　また、本発明に係るスラリー塗布装置は、上記の発明において、前記帯状体の揺動量の時間変化が、矩形波状、正弦波状、または三角形波状であることを特徴とする。 Further, the slurry coating apparatus according to the present invention is characterized in that, in the above-mentioned invention, the time variation of the swinging amount of the band-like body is a rectangular wave shape, a sine wave shape, or a triangular wave shape.
　また、本発明に係るスラリー塗布装置は、上記の発明において、前記帯状体の揺動周波数が、前記帯状体を巻き取ってなるコイルのターンピッチをもとに設定されることを特徴とする。 Further, the slurry coating apparatus according to the present invention is characterized in that, in the above invention, the oscillation frequency of the strip is set based on a turn pitch of a coil formed by winding the strip.
　また、本発明に係るスラリー塗布装置は、上記の発明において、前記帯状体の揺動周波数が、前記ターンピッチの偶数倍をもとに設定されることを特徴とする。 Further, the slurry coating apparatus according to the present invention is characterized in that, in the above invention, the oscillation frequency of the strip is set based on an even multiple of the turn pitch.
　また、本発明に係るスラリー塗布方法は、走行する帯状体に対してスラリーを塗布するスラリー塗布方法において、前記帯状体の面に概ね平行で且つ前記帯状体の走行方向に対して概ね直角な方向に前記スラリーの吐出口と前記帯状体との相対的な位置関係を変化させつつ、前記帯状体に前記スラリーを供給することを特徴とする。 The slurry application method according to the present invention is a slurry application method in which slurry is applied to a traveling belt-like body, and is substantially parallel to the surface of the belt-like body and substantially perpendicular to the traveling direction of the belt-like body. The slurry is supplied to the strip while changing the relative positional relationship between the discharge port of the slurry and the strip.
　また、本発明に係るスラリー塗布方法は、上記の発明において、前記帯状体の面に概ね平行で且つ前記帯状体の走行方向に対して概ね直角な方向に前記吐出口を前記帯状体に対し相対的に揺動しつつ、前記帯状体に前記スラリーを供給するスラリー供給ステップと、前記スラリーが供給された前記帯状体を把持しつつ押圧して前記スラリーを前記帯状体の表面に塗布するスラリー塗布ステップと、を含むことを特徴とする。 The slurry application method according to the present invention is the above-described invention, wherein the discharge port is relatively parallel to the surface of the strip and is substantially perpendicular to the running direction of the strip. A slurry supply step of supplying the slurry to the belt-like body while swinging, and slurry application for applying the slurry to the surface of the belt-like body by pressing while holding the belt-like body supplied with the slurry And a step.
　また、本発明に係るスラリー塗布方法は、上記の発明において、前記帯状体の面に概ね平行で且つ前記帯状体の走行方向に対して概ね直角な方向に前記帯状体を前記吐出口に対し相対的に揺動しつつ、前記帯状体に前記スラリーを供給するスラリー供給ステップと、前記スラリーが供給された前記帯状体を把持しつつ押圧して前記スラリーを前記帯状体の表面に塗布するスラリー塗布ステップと、を含むことを特徴とする。 Further, the slurry application method according to the present invention is the above-described invention, wherein the belt-like body is relative to the discharge port in a direction substantially parallel to the surface of the belt-like body and substantially perpendicular to the traveling direction of the belt-like body. A slurry supply step of supplying the slurry to the belt-like body while swinging, and slurry application for applying the slurry to the surface of the belt-like body by pressing while holding the belt-like body supplied with the slurry And a step.
　また、本発明に係るスラリー塗布方法は、上記の発明において、前記スラリー塗布ステップ後に、前記スラリーが供給された前記帯状体を把持しつつ押圧して前記スラリーを前記帯状体の表面に塗布する第２のスラリー塗布ステップをさらに含むことを特徴とする。 The slurry application method according to the present invention is the slurry application method according to the above invention, wherein after the slurry application step, the slurry is applied to the surface of the belt by holding and pressing the belt supplied with the slurry. The method further includes two slurry application steps.
　また、本発明に係るスラリー塗布方法は、上記の発明において、前記スラリー塗布ステップ後に、前記帯状体に前記スラリーを供給する第２のスラリー供給ステップを含むことを特徴とする。 Further, the slurry application method according to the present invention is characterized in that, in the above invention, after the slurry application step, a second slurry supply step is provided for supplying the slurry to the strip.
　また、本発明に係るスラリー塗布方法は、上記の発明において、前記第２のスラリー供給ステップにおいて、前記帯状体の面に概ね平行で且つ前記帯状体の走行方向に対して概ね直角な方向に前記スラリーの吐出口を前記帯状体に対し相対的に揺動しつつ、前記帯状体に前記スラリーを供給することを特徴とする。 Further, in the slurry application method according to the present invention, in the above invention, in the second slurry supply step, the slurry is applied in a direction substantially parallel to a surface of the strip and substantially perpendicular to a traveling direction of the strip. The slurry is supplied to the belt-like body while the slurry discharge port is swung relative to the belt-like body.
　また、本発明に係るスラリー塗布方法は、上記の発明において、前記スラリー供給ステップの前に、前記帯状体に前記スラリーを供給する第３のスラリー供給ステップと、前記第３のスラリー供給ステップにおいて前記スラリーが供給された前記帯状体を把持しつつ押圧して前記スラリーを前記帯状体の表面に塗布する第２のスラリー塗布ステップと、をさらに含むことを特徴とする。 Further, in the slurry application method according to the present invention, in the above invention, in the third slurry supply step for supplying the slurry to the strip and the third slurry supply step before the slurry supply step, And a second slurry application step of applying the slurry onto the surface of the band by holding and pressing the band supplied with the slurry.
　また、本発明に係るスラリー塗布方法は、上記の発明において、前記揺動における揺動量の時間変化を、矩形波状、正弦波状、または三角形波状とすることを特徴とする。 In addition, the slurry application method according to the present invention is characterized in that, in the above-described invention, the temporal change of the swing amount in the swing is a rectangular wave shape, a sine wave shape, or a triangular wave shape.
　また、本発明に係るスラリー塗布方法は、上記の発明において、前記帯状体を巻き取ってなるコイルのターンピッチをもとに、前記揺動における揺動周波数を設定することを特徴とする。 Further, the slurry application method according to the present invention is characterized in that, in the above-mentioned invention, the oscillation frequency in the oscillation is set based on a turn pitch of a coil formed by winding the strip.
　また、本発明に係るスラリー塗布方法は、上記の発明において、前記ターンピッチの偶数倍をもとに、前記揺動における揺動周波数を設定することを特徴とする。 Further, the slurry application method according to the present invention is characterized in that, in the above invention, the oscillation frequency in the oscillation is set based on an even multiple of the turn pitch.
　また、本発明に係るスラリー塗布方法は、上記の発明において、前記帯状体の揺動量の時間変化を、矩形波状、正弦波状、または三角形波状とすることを特徴とする。 Further, the slurry application method according to the present invention is characterized in that, in the above-mentioned invention, the temporal change in the amount of oscillation of the belt-like body is a rectangular wave shape, a sine wave shape, or a triangular wave shape.
　また、本発明に係るスラリー塗布方法は、上記の発明において、前記帯状体を巻き取ってなるコイルのターンピッチをもとに、前記帯状体の揺動周波数を設定することを特徴とする。 The slurry application method according to the present invention is characterized in that, in the above invention, the oscillation frequency of the strip is set based on a turn pitch of a coil formed by winding the strip.
　また、本発明に係るスラリー塗布方法は、上記の発明において、前記ターンピッチの偶数倍をもとに、前記帯状体の揺動周波数を設定することを特徴とする。 Further, the slurry application method according to the present invention is characterized in that, in the above invention, the oscillation frequency of the strip is set based on an even multiple of the turn pitch.
　本発明に係るスラリー塗布装置およびスラリー塗布方法によれば、鋼板の長手方向に沿った皺状の形状不良の発生を抑制して鋼板の製造における歩留まりを向上することができるという効果を奏する。 According to the slurry coating apparatus and the slurry coating method according to the present invention, there is an effect that it is possible to improve the yield in the production of steel sheets by suppressing the occurrence of saddle-like shape defects along the longitudinal direction of the steel sheets.
図１は、本発明の実施の形態１に係るスラリー塗布装置の一構成例を示す図である。FIG. 1 is a diagram illustrating a configuration example of a slurry coating apparatus according to Embodiment 1 of the present invention. 図２は、従来のスラリー塗布装置と、帯状体表面の焼鈍分離剤スラリーの膜厚分布とを示す概念図である。FIG. 2 is a conceptual diagram showing a conventional slurry coating apparatus and a film thickness distribution of the annealing separator slurry on the surface of the strip. 図３Ａは、従来の焼鈍分離剤スラリーが塗布された帯状体のコイルの断面斜視図である。FIG. 3A is a cross-sectional perspective view of a coil of a belt-like body to which a conventional annealing separator slurry is applied. 図３Ｂは、図３Ａにおける破線囲み部の部分拡大断面図である。FIG. 3B is a partially enlarged cross-sectional view of a portion surrounded by a broken line in FIG. 3A. 図４Ａは、本発明の実施の形態１に係るスラリー塗布装置によるスラリー供給ノズルの揺動制御の一例を示すグラフである。FIG. 4A is a graph showing an example of swing control of the slurry supply nozzle by the slurry applying apparatus according to Embodiment 1 of the present invention. 図４Ｂは、本発明の実施の形態１に係るスラリー塗布装置によるスラリー供給ノズルの揺動制御の別例を示すグラフである。FIG. 4B is a graph showing another example of the swing control of the slurry supply nozzle by the slurry applying apparatus according to Embodiment 1 of the present invention. 図４Ｃは、本発明の実施の形態１に係るスラリー塗布装置によるスラリー供給ノズルの揺動制御の更なる別例を示すグラフである。FIG. 4C is a graph showing still another example of the swing control of the slurry supply nozzle by the slurry applying apparatus according to the first embodiment of the present invention. 図５は、本発明の実施の形態１に係るスラリー塗布装置と、スラリー供給ノズルを正弦波状に制御した場合の帯状体表面の焼鈍分離剤スラリーの膜厚分布とを示す概念図である。FIG. 5 is a conceptual diagram showing the slurry coating apparatus according to Embodiment 1 of the present invention and the film thickness distribution of the annealing separator slurry on the surface of the belt-like body when the slurry supply nozzle is controlled in a sine wave shape. 図６Ａは、本発明の実施の形態１に係るスラリー塗布装置と、スラリー供給ノズルを矩形波状に制御した場合の帯状体表面の焼鈍分離剤スラリーの膜厚分布とを示す概念図である。FIG. 6A is a conceptual diagram showing the slurry application apparatus according to Embodiment 1 of the present invention and the film thickness distribution of the annealing separator slurry on the surface of the belt-like body when the slurry supply nozzle is controlled to have a rectangular wave shape. 図６Ｂは、本発明の実施の形態１における焼鈍分離剤スラリーが塗布された帯状体をコイルにした状態の部分拡大断面図である。FIG. 6B is a partially enlarged cross-sectional view of a state in which a strip-like body coated with the annealing separator slurry in Embodiment 1 of the present invention is coiled. 図７Ａは、本発明の実施の形態１に係るスラリー塗布装置の第１の変形例を示す構成図である。FIG. 7A is a configuration diagram illustrating a first modification of the slurry applying apparatus according to Embodiment 1 of the present invention. 図７Ｂは、本発明の実施の形態１に係るスラリー塗布装置の第２の変形例を示す構成図である。FIG. 7B is a configuration diagram showing a second modification of the slurry applying apparatus according to Embodiment 1 of the present invention. 図７Ｃは、本発明の実施の形態１に係るスラリー塗布装置の第３の変形例を示す構成図である。FIG. 7C is a configuration diagram showing a third modification of the slurry applying apparatus according to Embodiment 1 of the present invention. 図８は、本発明の実施の形態２に係るスラリー塗布装置の一構成例を示す図である。FIG. 8 is a diagram illustrating a configuration example of the slurry applying apparatus according to the second embodiment of the present invention. 図９Ａは、本発明の実施の形態２による帯状体に対する揺動制御の一例を示すグラフである。FIG. 9A is a graph showing an example of swing control for the belt-like body according to Embodiment 2 of the present invention. 図９Ｂは、本発明の実施の形態２による帯状体に対する揺動制御の別例を示すグラフである。FIG. 9B is a graph showing another example of the swing control for the band according to the second embodiment of the present invention. 図９Ｃは、本発明の実施の形態２による帯状体に対する揺動制御の更なる別例を示すグラフである。FIG. 9C is a graph showing still another example of the swing control for the band according to the second embodiment of the present invention. 図１０は、本発明の実施の形態２に係るスラリー塗布装置と、帯状体に対して正弦波状に揺動制御を行った場合の帯状体表面の焼鈍分離剤スラリーの膜厚分布とを示す概念図である。FIG. 10 is a conceptual diagram showing the slurry coating apparatus according to Embodiment 2 of the present invention and the film thickness distribution of the annealing separator slurry on the surface of the band when the band-shaped body is controlled to swing sinusoidally. FIG. 図１１Ａは、本発明の実施の形態２に係るスラリー塗布装置と、帯状体に対して矩形波状に揺動制御を行った場合の帯状体表面の焼鈍分離剤スラリーの膜厚分布とを示す概念図である。FIG. 11A is a concept showing a slurry coating apparatus according to Embodiment 2 of the present invention and a film thickness distribution of the annealing separator slurry on the surface of the band when the band-shaped rocking control is performed on the band. FIG. 図１１Ｂは、本発明の実施の形態２における焼鈍分離剤スラリーが塗布された帯状体をコイルにした状態の部分拡大断面図である。FIG. 11B is a partially enlarged cross-sectional view of a state in which a strip-like body coated with the annealing separator slurry in Embodiment 2 of the present invention is coiled. 図１２Ａは、本発明の実施の形態２に係るスラリー塗布装置の第１の変形例を示す構成図である。FIG. 12A is a configuration diagram illustrating a first modification of the slurry application apparatus according to Embodiment 2 of the present invention. 図１２Ｂは、本発明の実施の形態２に係るスラリー塗布装置の第２の変形例を示す構成図である。FIG. 12B is a configuration diagram showing a second modification of the slurry applying apparatus according to Embodiment 2 of the present invention. 図１２Ｃは、本発明の実施の形態２に係るスラリー塗布装置の第３の変形例を示す構成図である。FIG. 12C is a configuration diagram illustrating a third modification of the slurry application apparatus according to Embodiment 2 of the present invention.
　以下に、本発明に係るスラリー塗布装置およびスラリー塗布方法の好適な実施の形態について図面を参照しつつ説明する。なお、以下の実施形態の全図においては、同一または対応する部分には同一の符号を付す。また、本発明は以下に説明する実施形態によって限定されるものではない。 Hereinafter, preferred embodiments of a slurry coating apparatus and a slurry coating method according to the present invention will be described with reference to the drawings. In all the drawings of the following embodiments, the same or corresponding parts are denoted by the same reference numerals. Further, the present invention is not limited to the embodiments described below.
（実施の形態１）
　最初に、本発明の内容の理解を容易とするために、スラリー塗布装置およびスラリー塗布方法に対して本発明者らが行った鋭意検討について説明する。まず、本発明の実施の形態１に係るスラリー塗布装置について説明する。図１は、本発明の実施の形態１に係るスラリー塗布装置の一構成例を示す図である。 (Embodiment 1)
First, in order to facilitate the understanding of the contents of the present invention, a diligent study conducted by the present inventors for a slurry coating apparatus and a slurry coating method will be described. First, the slurry coating apparatus according to Embodiment 1 of the present invention will be described. FIG. 1 is a diagram illustrating a configuration example of a slurry coating apparatus according to Embodiment 1 of the present invention.
　図１に示すように、本実施の形態１に係るスラリー塗布装置２０は、鋼板に焼鈍分離剤スラリー４を塗布する装置であり、スクイーズロール２とスラリー供給ノズル３とを有する。スラリー供給ノズル３は、方向性電磁鋼板である帯状体１に対して焼鈍分離剤スラリー４を供給する複数の吐出口を有するスラリー吐出手段である。スクイーズロール２は、帯状体１上に塗布した焼鈍分離剤スラリー４を所定の厚さまで絞る一対の塗布手段である。なお、詳細は後述するが、本実施の形態１におけるスラリー供給ノズル３は、帯状体１の面に概ね平行であり且つ帯状体１を送り出す方向（帯状体１の走行方向）に対して概ね直角な方向、すなわち帯状体１の幅方向に、帯状体１に対し相対的に揺動可能に構成されている。 As shown in FIG. 1, the slurry application apparatus 20 according to the first embodiment is an apparatus that applies an annealing separator slurry 4 to a steel plate, and includes a squeeze roll 2 and a slurry supply nozzle 3. The slurry supply nozzle 3 is a slurry discharge means having a plurality of discharge ports for supplying the annealing separator slurry 4 to the strip 1 that is a grain-oriented electrical steel sheet. The squeeze roll 2 is a pair of application means that squeeze the annealing separator slurry 4 applied on the strip 1 to a predetermined thickness. Although details will be described later, the slurry supply nozzle 3 according to the first embodiment is substantially parallel to the surface of the strip 1 and is generally perpendicular to the direction in which the strip 1 is sent out (the travel direction of the strip 1). In this direction, that is, in the width direction of the strip 1, it is configured to be able to swing relative to the strip 1.
　このように構成されたスラリー塗布装置２０を用いた焼鈍分離剤スラリー４の塗布においては、スラリー供給ノズル３が帯状体１の表面に焼鈍分離剤スラリー４を吐出供給した後、スクイーズロール２が、帯状体１をその厚さ方向に把持しつつ押圧（挟持）して、帯状体１の表面に塗布された焼鈍分離剤スラリー４を所定の膜厚まで絞る。その後、帯状体１は、仕上げ焼鈍工程（２次再結晶焼鈍工程）、コーティング工程、およびフラットニング焼鈍工程などの種々の工程を経て、最終的に電磁鋼板の製品となる。 In the application of the annealing separator slurry 4 using the slurry coating apparatus 20 configured as described above, after the slurry supply nozzle 3 discharges and supplies the annealing separator slurry 4 to the surface of the strip 1, the squeeze roll 2 is The band-like body 1 is pressed (clamped) while being gripped in the thickness direction, and the annealing separator slurry 4 applied to the surface of the band-like body 1 is squeezed to a predetermined film thickness. After that, the strip 1 is subjected to various processes such as a finish annealing process (secondary recrystallization annealing process), a coating process, and a flattening annealing process, and finally becomes a product of an electromagnetic steel sheet.
　ここで、本発明者らは、従来のスラリー塗布装置を用いた場合において、フラットニング焼鈍後の帯状体１の表面に形成される皺状の形状不良について検討を行った。その結果、本発明者らは、形状不良に関して、帯状体１の幅方向に沿った発生位置とスラリー供給ノズル３の幅方向に沿った設置位置との間に、一定の相関が認められることを知見した。そして、本発明者らは、焼鈍分離剤スラリー４の膜厚が帯状体１の幅方向に沿って不均一な分布を生じていることに着目し、この膜厚分布が形状不良に影響していることを想起するに至った。 Here, the present inventors have studied the saddle-like shape defect formed on the surface of the strip 1 after the flattening annealing in the case of using a conventional slurry coating apparatus. As a result, the present inventors have found that a certain correlation is recognized between the generation position along the width direction of the strip 1 and the installation position along the width direction of the slurry supply nozzle 3 with respect to the shape defect. I found out. Then, the inventors pay attention to the fact that the film thickness of the annealing separator slurry 4 has a non-uniform distribution along the width direction of the strip 1, and this film thickness distribution affects the shape defect. I came to remember.
　図２は、この従来のスラリー塗布装置の構成と、帯状体１上の焼鈍分離剤スラリー４を所定の膜厚に絞った後における、焼鈍分離剤スラリー４の帯状体１の幅方向に沿った膜厚分布とを示す。 FIG. 2 shows the configuration of this conventional slurry coating apparatus and the width direction of the strip 1 of the annealing separator slurry 4 after the annealing separator slurry 4 on the strip 1 is narrowed to a predetermined film thickness. The film thickness distribution is shown.
　図２に示すように、従来のスラリー塗布装置１００のスラリー供給ノズル１０３が帯状体１の表面に焼鈍分離剤スラリー４を供給すると、焼鈍分離剤スラリー４の膜厚は、スラリー供給ノズル１０３のそれぞれの吐出口に近い位置では大きくなり、遠い位置では小さくなると考えられる。そこで、従来のスラリー塗布装置１００においては、帯状体１の幅方向に沿った焼鈍分離剤スラリー４の膜厚分布と帯状体１の長手方向に沿った焼鈍分離剤スラリー４の膜厚分布とを制御していた。これにより、帯状体１の表面における焼鈍分離剤スラリー４の膜厚の厚薄差は所定範囲内に収まる。ところが、このように焼鈍分離剤スラリー４の膜厚の厚薄差を所定範囲内に収めても、上述した皺状の形状不良の発生は回避できなかった。 As shown in FIG. 2, when the slurry supply nozzle 103 of the conventional slurry application apparatus 100 supplies the annealing separator slurry 4 to the surface of the strip 1, the film thickness of the annealing separator slurry 4 is set to each of the slurry supply nozzles 103. This is considered to be large at a position close to the discharge port and small at a position far away. Therefore, in the conventional slurry coating apparatus 100, the film thickness distribution of the annealing separator slurry 4 along the width direction of the strip 1 and the film thickness distribution of the annealing separator slurry 4 along the longitudinal direction of the strip 1 are obtained. I was in control. Thereby, the thickness difference of the film thickness of the annealing separator slurry 4 on the surface of the strip 1 is within a predetermined range. However, even if the thickness difference of the film thickness of the annealing separator slurry 4 falls within a predetermined range as described above, the occurrence of the above-described bowl-shaped shape defect cannot be avoided.
　本発明者らの知見によれば、スラリー供給ノズル１０３の吐出口の設置位置に起因して焼鈍分離剤スラリー４のわずかな膜厚分布が帯状体１の表面に生じることは、不可避である。すなわち、膜厚が比較的大きい山部と膜厚が比較的小さい谷部とからなる焼鈍分離剤スラリー４の塗布むらは、スラリー供給ノズル１０３の吐出口の位置に起因するため、不可避な現象であると考えられる。 According to the knowledge of the present inventors, it is inevitable that a slight film thickness distribution of the annealing separator slurry 4 is generated on the surface of the strip 1 due to the installation position of the discharge port of the slurry supply nozzle 103. That is, uneven application of the annealing separator slurry 4 composed of a crest having a relatively large film thickness and a trough having a relatively small film thickness is caused by the position of the discharge port of the slurry supply nozzle 103, and thus is an unavoidable phenomenon. It is believed that there is.
　そこで、本発明者らはさらに鋭意検討を重ね、焼鈍分離剤スラリー４の塗布むらが、形状不良の発生に与える影響についてさらに検討を行った。 Therefore, the present inventors conducted further intensive studies, and further examined the influence of uneven application of the annealing separator slurry 4 on the occurrence of shape defects.
　そして、本発明者らは、焼鈍分離剤スラリー４を塗布した帯状体１を巻き取ってコイルにすると、帯状体１上の焼鈍分離剤スラリー４の山部および谷部が、帯状体１の幅方向において常に同じ位置に存在する点に着目した。図３Ａは、従来の焼鈍分離剤スラリーが塗布された帯状体のコイルの断面斜視図である。図３Ａには、スラリー供給ノズル１０３によって焼鈍分離剤スラリー４を塗布した帯状体１を巻き取ってコイル１０とした状態の帯状体１の幅方向に沿った断面が示される。図３Ｂは、図３Ａ中の破線囲み部の断面を示す部分拡大断面図である。 And when the present inventors wind up the strip | belt-shaped body 1 which apply | coated the annealing separator slurry 4 and make it a coil, the peak part and trough part of the annealing separator slurry 4 on the strip | belt-shaped body 1 will be the width | variety of the strip | belt-shaped body 1. We paid attention to the fact that it always exists at the same position in the direction. FIG. 3A is a cross-sectional perspective view of a coil of a belt-like body to which a conventional annealing separator slurry is applied. FIG. 3A shows a cross section along the width direction of the strip 1 in a state where the strip 1 coated with the annealing separator slurry 4 is wound up by the slurry supply nozzle 103 to form a coil 10. FIG. 3B is a partially enlarged cross-sectional view showing a cross section of a portion surrounded by a broken line in FIG. 3A.
　すなわち、図３Ａに示すように、帯状体１をコイル状に巻き取って中空円柱状のコイル１０にすると、図３Ｂに示すように、帯状体１の表面における焼鈍分離剤スラリー４の山部が、コイル１０において帯状体１の長手方向に沿った断面における円の半径方向に順次積層し、いわゆるビルドアップが生じて焼鈍分離剤スラリー４が突出する（図３Ｂ中、破線囲み内）。そして、この帯状体１の表面の焼鈍分離剤スラリー４の山部におけるビルドアップが、仕上げ焼鈍工程中に帯状体１の形状不良が発生する原因になると考えられる。なお、帯状体１の表面に焼鈍分離剤スラリー４を供給した後に視認される塗布むらによるスジ模様の位置と、帯状体１の表面に形成される形状不良の位置とは必ずしも一致しない。 That is, as shown in FIG. 3A, when the strip 1 is wound into a coil shape to form a hollow cylindrical coil 10, the peak of the annealing separator slurry 4 on the surface of the strip 1 is formed as shown in FIG. 3B. The coils 10 are sequentially laminated in the radial direction of the circle in the cross section along the longitudinal direction of the strip 1, so-called build-up occurs, and the annealing separator slurry 4 protrudes (inside the broken line in FIG. 3B). And it is thought that the buildup in the peak part of the annealing separator slurry 4 on the surface of the strip 1 causes the shape defect of the strip 1 during the finish annealing process. In addition, the position of the streak pattern due to the coating unevenness that is visually recognized after supplying the annealing separator slurry 4 to the surface of the strip 1 does not necessarily match the position of the shape defect formed on the surface of the strip 1.
　以上のことから、本発明者らは、不可避である帯状体１の幅方向に沿った焼鈍分離剤スラリー４の不均一な膜厚分布の発生を完全に抑制するよりも、不均一な膜厚分布の発生を前提として、その膜厚分布を可能な限りなだらかにしたり、帯状体１をコイルにした際のビルドアップを抑制したりすることができれば、形状不良の発生を抑制できることを想起した。 From the above, the present inventors have a non-uniform film thickness rather than completely suppressing the occurrence of a non-uniform film thickness distribution of the annealing separator slurry 4 along the width direction of the strip 1 that is unavoidable. Recalling that the occurrence of shape defects can be suppressed if the distribution of the film thickness is made as gentle as possible, or the build-up when the strip 1 is made into a coil can be suppressed on the premise of the occurrence of the distribution.
　従って、本発明の実施の形態１に係るスラリー塗布装置２０は、図１に示すように、複数の吐出口を有するスラリー供給ノズル３を、帯状体１の面に平行であり且つ帯状体１の走行方向に対して直角な方向、すなわち帯状体１の幅方向に沿って、帯状体１に対し相対的に揺動させる構成を採用している。スラリー供給ノズル３は、帯状体１の幅方向に沿って帯状体１に対し相対的に揺動しつつ、帯状体１の表面に焼鈍分離剤スラリー４を吐出供給する。これにより、スラリー供給ノズル３は、その吐出口と帯状体１との相対的な位置関係を帯状体１の幅方向に沿って経時的に変化させながら、帯状体１に対して焼鈍分離剤スラリー４を供給することができる。 Therefore, as shown in FIG. 1, the slurry application device 20 according to the first exemplary embodiment of the present invention is configured so that the slurry supply nozzle 3 having a plurality of discharge ports is parallel to the surface of the band 1 and the band 1 A configuration is adopted in which rocking is performed relative to the band 1 along a direction perpendicular to the traveling direction, that is, the width direction of the band 1. The slurry supply nozzle 3 discharges and supplies the annealing separator slurry 4 to the surface of the band 1 while swinging relative to the band 1 along the width direction of the band 1. Thereby, the slurry supply nozzle 3 changes the relative positional relationship between the discharge port and the strip 1 along the width direction of the strip 1 over time, while annealing separator slurry with respect to the strip 1. 4 can be supplied.
　図４Ａ、図４Ｂ、および図４Ｃはいずれも、このスラリー供給ノズル３を揺動させる際の揺動量を時間変化させる制御方法の例を示すグラフである。図５は、本発明の実施の形態１に係るスラリー塗布装置と、スラリー供給ノズルを正弦波状に制御した場合の帯状体表面の焼鈍分離剤スラリーの膜厚分布とを示す概念図である。図５には、このスラリー塗布装置２０の構成図と、図４Ａに示すグラフに基づいてスラリー供給ノズル３の揺動を制御した場合の帯状体１の表面の焼鈍分離剤スラリー４の膜厚分布を示すグラフとが示される。 4A, FIG. 4B, and FIG. 4C are all graphs showing an example of a control method for changing the amount of rocking when the slurry supply nozzle 3 is rocked over time. FIG. 5 is a conceptual diagram showing the slurry coating apparatus according to Embodiment 1 of the present invention and the film thickness distribution of the annealing separator slurry on the surface of the belt-like body when the slurry supply nozzle is controlled in a sine wave shape. FIG. 5 shows the thickness distribution of the annealing separator slurry 4 on the surface of the strip 1 when the swing of the slurry supply nozzle 3 is controlled based on the configuration diagram of the slurry application device 20 and the graph shown in FIG. 4A. And a graph showing.
　スラリー供給ノズル３は帯状体１の幅方向に沿って、図４Ａに示すように正弦波状に揺動したり、図４Ｂに示すように三角形波状に揺動したりする。これにより、図５における焼鈍分離剤スラリー４の膜厚分布のグラフに示すように、帯状体１の幅方向に沿った焼鈍分離剤スラリー４の膜厚分布は、上述したスラリー供給ノズル１０３を揺動させることなく固定した状態で焼鈍分離剤スラリー４を吐出する従来の場合（図２参照）に比してなだらかになる。ここで、図５に示すスラリー供給ノズル３の揺動幅としては、スラリー供給ノズル３における複数の吐出口において隣り合う吐出口の間隔に対して、１／２程度にすることが望ましい。これにより、スラリー供給ノズル３の複数の吐出口の間において、焼鈍分離剤スラリー４の供給が帯状体１の幅方向に対して平均化する。 The slurry supply nozzle 3 swings in a sine wave shape as shown in FIG. 4A or swings in a triangular wave shape as shown in FIG. 4B along the width direction of the strip 1. Thereby, as shown in the graph of the film thickness distribution of the annealing separator slurry 4 in FIG. 5, the film thickness distribution of the annealing separator slurry 4 along the width direction of the strip 1 shakes the slurry supply nozzle 103 described above. Compared with the conventional case (see FIG. 2) in which the annealing separator slurry 4 is discharged in a fixed state without being moved. Here, the swinging width of the slurry supply nozzle 3 shown in FIG. 5 is desirably about ½ of the interval between the discharge ports adjacent to each other in the plurality of discharge ports in the slurry supply nozzle 3. Thereby, the supply of the annealing separator slurry 4 is averaged with respect to the width direction of the strip 1 between the plurality of discharge ports of the slurry supply nozzle 3.
　また、図４Ａおよび図４Ｂに示すピッチＴは、１～１５０秒、好適には、２～１２０秒とするのが望ましい。これにより、図２に示す焼鈍分離剤スラリー４の膜厚分布の不均一性に比して、図５に示すように、焼鈍分離剤スラリー４が帯状体１の表面に緩やかに塗布されて焼鈍分離剤スラリー４の谷部と山部とが緩やかに形成されることから、焼鈍分離剤スラリー４の膜厚分布における厚薄差が緩和されてなだらかになる。この結果、帯状体１の表面における形状不良の発生を防止することができる。なお、スラリー供給ノズル３を三角形波状に制御する場合において、実際には、揺動機構の制約によって、図４Ｂに示すように、三角形波状の折り返し端部が滑らかな略三角形波状の波形になったり、この端部において有限時間停止することで台形波状になったりする場合もあるが、これらの揺動に関しても三角形波状の揺動に含まれる。 Also, the pitch T shown in FIGS. 4A and 4B is preferably 1 to 150 seconds, and preferably 2 to 120 seconds. Thereby, as shown in FIG. 5, the annealing separator slurry 4 is gently applied to the surface of the strip 1 and annealed as compared to the non-uniformity of the film thickness distribution of the annealing separator slurry 4 shown in FIG. Since the valleys and peaks of the separating agent slurry 4 are gently formed, the thickness difference in the film thickness distribution of the annealing separating agent slurry 4 is relaxed and becomes gentle. As a result, it is possible to prevent the occurrence of shape defects on the surface of the strip 1. In the case where the slurry supply nozzle 3 is controlled to have a triangular wave shape, actually, the triangular wave-like folded end portion has a smooth substantially triangular wave shape waveform as shown in FIG. In some cases, a trapezoidal wave shape may be obtained by stopping at this end portion for a finite period of time. However, these oscillations are also included in the triangular wave oscillation.
　また、図６Ａは、本発明の実施の形態１に係るスラリー塗布装置と、スラリー供給ノズルを矩形波状に制御した場合の帯状体表面の焼鈍分離剤スラリーの膜厚分布とを示す概念図である。図６Ａには、スラリー塗布装置２０の構成図と、図４Ｃに示すグラフに基づいてスラリー供給ノズル３の揺動量を制御した場合における、帯状体１の表面の焼鈍分離剤スラリー４の２層分の膜厚分布を示すグラフとが示される。図６Ｂは、本発明の実施の形態１における焼鈍分離剤スラリーが塗布された帯状体をコイルにした状態の部分拡大断面図である。図６Ｂには、図６Ａに示すように帯状体１の表面に焼鈍分離剤スラリー４を塗布した後、この帯状体１をコイル状に巻き取って図３Ａに示すコイル１０とした場合における、図３Ｂに対応するコイル１０の積層構造が示される。 FIG. 6A is a conceptual diagram showing the slurry application apparatus according to Embodiment 1 of the present invention and the film thickness distribution of the annealing separator slurry on the surface of the belt-like body when the slurry supply nozzle is controlled to have a rectangular wave shape. . FIG. 6A shows two layers of the annealing separator slurry 4 on the surface of the strip 1 when the swing amount of the slurry supply nozzle 3 is controlled based on the configuration diagram of the slurry application device 20 and the graph shown in FIG. 4C. And a graph showing the film thickness distribution. FIG. 6B is a partially enlarged cross-sectional view of a state in which a strip-like body coated with the annealing separator slurry in Embodiment 1 of the present invention is coiled. FIG. 6B is a diagram in the case where the annealing separator slurry 4 is applied to the surface of the strip 1 as shown in FIG. 6A and then the strip 1 is wound into a coil to form the coil 10 shown in FIG. 3A. A laminated structure of the coil 10 corresponding to 3B is shown.
　図４Ｃに示すように、スラリー供給ノズル３が帯状体１の幅方向に沿って矩形波状に揺動すると、図６Ａの膜厚分布のグラフに示すように、帯状体１をコイル１０とした際に、積層した帯状体１の２段の層の間で、焼鈍分離剤スラリー４の山部と谷部とが重なる。ここで、スラリー供給ノズル３の揺動幅は、複数の吐出口において隣り合う吐出口の間隔に対して、１／２程度にすることが望ましい。 When the slurry supply nozzle 3 swings in a rectangular wave shape along the width direction of the strip 1 as shown in FIG. 4C, when the strip 1 is used as the coil 10 as shown in the graph of the film thickness distribution in FIG. In addition, the crests and troughs of the annealing separator slurry 4 overlap between the two layers of the laminated strip 1. Here, it is desirable that the swinging width of the slurry supply nozzle 3 be about ½ of the interval between adjacent discharge ports in the plurality of discharge ports.
　また、図４Ｃに示すピッチＴは、１～１５０秒、好適には、２～１２０秒とするのが望ましい。これは、スラリー供給ノズル３の揺動量の時間変化を矩形波状に制御する場合のピッチＴが１秒より短すぎると、図２に示すような焼鈍分離剤スラリー４の膜厚分布の不均一性が残存してしまい、１５０秒より長すぎると帯状体１をコイル１０とした際の一巻きごとのずれ量が小さくなって、焼鈍分離剤スラリー４の山部と谷部とが２層間で重ならなくなり、図３Ｂに示すようなビルドアップが生じてしまうためである。なお、スラリー供給ノズル３の揺動を矩形波状に制御する場合であっても、スラリー供給ノズル３の移動速度が有限であることから、板幅方向に沿って瞬時にノズルを移動させることは困難であるので、実際の揺動はほぼ台形波状になるが、この揺動に関しても矩形波状の揺動に含まれる。 Further, the pitch T shown in FIG. 4C is preferably 1 to 150 seconds, and preferably 2 to 120 seconds. This is because if the pitch T in the case of controlling the time variation of the swing amount of the slurry supply nozzle 3 to be a rectangular wave is too shorter than 1 second, the film thickness distribution of the annealing separator slurry 4 as shown in FIG. If it is longer than 150 seconds, the amount of deviation per turn when the strip 1 is used as the coil 10 becomes small, and the crest and trough of the annealing separator slurry 4 overlap between the two layers. This is because a build-up as shown in FIG. 3B occurs. Even when the oscillation of the slurry supply nozzle 3 is controlled in a rectangular wave shape, it is difficult to instantaneously move the nozzle along the plate width direction because the moving speed of the slurry supply nozzle 3 is finite. Therefore, the actual swing is substantially trapezoidal, but this swing is also included in the rectangular wave swing.
　これにより、図６Ｂに示すように、焼鈍分離剤スラリー４の膜厚分布における山部と谷部とが、コイル１０における帯状体１の長手方向に沿った断面の円の径方向に沿って順次積層されるので、上述したビルドアップを防止することができる。したがって、帯状体１における形状不良の発生を抑制することができる。 As a result, as shown in FIG. 6B, the peaks and valleys in the film thickness distribution of the annealing separator slurry 4 are sequentially along the radial direction of the circle of the section along the longitudinal direction of the strip 1 in the coil 10. Since they are stacked, the build-up described above can be prevented. Therefore, it is possible to suppress the occurrence of a shape defect in the band 1.
　なお、スラリー供給ノズル３の揺動に関しては、スラリー供給ノズル３のみを揺動させることが簡便であるが、必ずしもこれに限定されない。具体的には、スラリー供給ノズル３を保持するスラリー塗布装置２０の全体を、走行する帯状体１に対して相対的に揺動させることによって、スラリー供給ノズル３を帯状体１に対して揺動させてもよいし、スラリー塗布装置２０が備える塗布ロールなどの付帯設備を併せて揺動させてもよい。 In addition, regarding the swing of the slurry supply nozzle 3, it is simple to swing only the slurry supply nozzle 3, but the present invention is not necessarily limited thereto. Specifically, the slurry supply nozzle 3 is swung with respect to the strip 1 by swinging the entire slurry application device 20 holding the slurry supply nozzle 3 relative to the traveling strip 1. Alternatively, incidental equipment such as a coating roll provided in the slurry coating apparatus 20 may be swung together.
（実施の形態１の変形例）
　次に、上述した実施の形態１による装置構成を適用可能な、分離剤塗布工程におけるスラリー塗布装置の構成について説明する。図７Ａ、図７Ｂ、および図７Ｃはそれぞれ、本実施の形態１に係るスラリー塗布装置の第１の変形例、第２の変形例、および第３の変形例を示す構成図である。 (Modification of Embodiment 1)
Next, the configuration of the slurry coating apparatus in the separating agent coating process to which the apparatus configuration according to the first embodiment described above can be applied will be described. 7A, FIG. 7B, and FIG. 7C are configuration diagrams respectively showing a first modification, a second modification, and a third modification of the slurry applying apparatus according to the first embodiment.
（実施の形態１の第１の変形例）
　図７Ａに示すように、本実施の形態１の第１の変形例に係るスラリー塗布装置２１は、粗塗布ロール２ａ、一対のバックアップロール２ｂ、一対の塗布ロール２ｃ、および一対の粗塗布ロール前ノズル３ａを有する。一対の粗塗布ロール前ノズル３ａは、焼鈍分離剤スラリー４を帯状体１の両表面に吐出供給する一対のスラリー吐出手段である。一対の粗塗布ロール２ａは、帯状体１をその厚さ方向に把持しつつ押圧（挟持）して、粗塗布ロール前ノズル３ａが供給する焼鈍分離剤スラリー４を帯状体１の両表面に粗塗りする一対の塗布手段である。一対の塗布ロール２ｃは、帯状体１の両面側に設けられた一対のバックアップロール２ｂによって支持されて、粗塗りされた焼鈍分離剤スラリー４を絞る塗布手段である。そして、この第１の変形例によるスラリー塗布装置２１においては、粗塗布ロール前ノズル３ａが、帯状体１の幅方向（図７Ａ中、紙面垂直方向）に沿って帯状体１に対し相対的に揺動可能に構成されている。粗塗布ロール前ノズル３ａは、このように揺動しつつ帯状体１の両表面に焼鈍分離剤スラリー４を吐出供給する。これにより、粗塗布ロール前ノズル３ａは、その吐出口と帯状体１との相対的な位置関係を帯状体１の幅方向に沿って経時的に変化させながら、帯状体１に対して焼鈍分離剤スラリー４を供給することができる。 (First Modification of Embodiment 1)
As shown in FIG. 7A, the slurry application device 21 according to the first modification of the first embodiment includes a rough application roll 2a, a pair of backup rolls 2b, a pair of application rolls 2c, and a pair of rough application rolls. It has a nozzle 3a. The pair of pre-rough application roll nozzles 3 a is a pair of slurry discharge means for supplying the annealing separator slurry 4 to both surfaces of the strip 1. The pair of rough coating rolls 2a presses (nips) the belt-shaped body 1 while gripping the belt-shaped body 1 in the thickness direction, and roughens the annealing separator slurry 4 supplied by the nozzle 3a before the rough coating roll on both surfaces of the belt-shaped body 1. It is a pair of application means to apply. The pair of coating rolls 2 c is a coating unit that squeezes the coarsely coated annealing separator slurry 4 supported by a pair of backup rolls 2 b provided on both sides of the strip 1. And in the slurry application apparatus 21 by this 1st modification, the nozzle 3a before rough | crude application | coating roll is relatively with respect to the strip | belt-shaped body 1 along the width direction (FIG. 7A, paper surface perpendicular | vertical direction) of the strip | belt-shaped body 1. It is configured to be swingable. The nozzle 3a before the rough application roll discharges and supplies the annealing separator slurry 4 to both surfaces of the strip 1 while swinging in this way. As a result, the nozzle 3a before the rough coating roll is annealed and separated from the strip 1 while changing the relative positional relationship between the discharge port and the strip 1 along the width direction of the strip 1 over time. The agent slurry 4 can be supplied.
（実施の形態１の第２の変形例）
　本実施の形態１の第２の変形例に係るスラリー塗布装置２２は、図７Ｂに示すように、上述した第１の変形例によるスラリー塗布装置２１と同様のスラリー吐出手段もしくは第２または第３のスラリー吐出手段としての粗塗布ロール前ノズル３ａの下流であり且つ一対の塗布ロール２ｃに対して帯状体１の走行方向の上流側において、帯状体１の一方の面側に、スラリー吐出手段もしくは第３または第２のスラリー吐出手段としての塗布ロール前ノズル３ｂを有する。そして、このスラリー塗布装置２２において、粗塗布ロール前ノズル３ａおよび塗布ロール前ノズル３ｂの少なくともいずれか一方は、帯状体１の幅方向（図７Ｂ中、紙面垂直方向）に沿って帯状体１に対し相対的に揺動可能に構成されている。粗塗布ロール前ノズル３ａおよび塗布ロール前ノズル３ｂの少なくともいずれか一方は、このように揺動しつつ帯状体１の両表面または一方の面に焼鈍分離剤スラリー４を吐出供給する。これにより、粗塗布ロール前ノズル３ａおよび塗布ロール前ノズル３ｂの少なくともいずれか一方は、自身の吐出口と帯状体１との相対的な位置関係を帯状体１の幅方向に沿って経時的に変化させながら、帯状体１に対して焼鈍分離剤スラリー４を供給することができる。 (Second Modification of Embodiment 1)
As shown in FIG. 7B, the slurry application device 22 according to the second modification example of the first embodiment is similar to the slurry application unit 21 or the second or third method as the slurry application apparatus 21 according to the first modification example described above. The slurry discharge means or the downstream side of the nozzle 3a before the coarse application roll as the slurry discharge means and upstream of the pair of application rolls 2c in the traveling direction of the band 1 It has a pre-application roll nozzle 3b as a third or second slurry discharge means. And in this slurry application | coating apparatus 22, at least any one of the nozzle 3a before a rough application roll and the nozzle 3b before an application roll is set to the strip | belt body 1 along the width direction (perpendicular to the paper surface in FIG. 7B) of the strip | belt body 1. On the other hand, it is configured to be relatively swingable. At least one of the pre-coating roll nozzle 3a and the pre-coating roll nozzle 3b discharges and supplies the annealing separator slurry 4 to both surfaces or one surface of the strip 1 while swinging in this manner. Thereby, at least one of the nozzle 3a before the rough application roll and the nozzle 3b before the application roll changes the relative positional relationship between the discharge port and the strip 1 along the width direction of the strip 1 over time. While changing, the annealing separator slurry 4 can be supplied to the strip 1.
（実施の形態１の第３の変形例）
　本実施の形態１の第３の変形例に係るスラリー塗布装置２３は、図７Ｃに示すように、上述した第１の変形例によるスラリー塗布装置２１と同様の構成を有し、さらに、一対の塗布ロール２ｃの帯状体１の走行方向の下流側に、第２のスラリー吐出手段としての塗布ロール後ノズル３ｃを有する。そして、この第３の変形例によるスラリー塗布装置２３においては、粗塗布ロール前ノズル３ａおよび塗布ロール後ノズル３ｃの少なくともいずれか一方が、帯状体１の幅方向（図７Ｃ中、紙面垂直方向）に沿って帯状体１に対し相対的に揺動可能に構成されている。粗塗布ロール前ノズル３ａおよび塗布ロール後ノズル３ｃの少なくともいずれか一方は、このように揺動しつつ帯状体１の両表面または一方の面に焼鈍分離剤スラリー４を吐出供給する。これにより、粗塗布ロール前ノズル３ａおよび塗布ロール後ノズル３ｃの少なくともいずれか一方は、自身の吐出口と帯状体１との相対的な位置関係を帯状体１の幅方向に沿って経時的に変化させながら、帯状体１に対して焼鈍分離剤スラリー４を供給することができる。 (Third Modification of Embodiment 1)
As shown in FIG. 7C, the slurry coating apparatus 23 according to the third modification of the first embodiment has a configuration similar to that of the slurry coating apparatus 21 according to the first modification described above, and further includes a pair of On the downstream side in the traveling direction of the strip 1 of the coating roll 2c, there is a post-rolling nozzle 3c as a second slurry discharge means. In the slurry application device 23 according to the third modification, at least one of the nozzle 3a before the rough application roll and the nozzle 3c after the application roll is in the width direction of the strip 1 (in FIG. 7C, the direction perpendicular to the paper surface). And can be swung relative to the belt-like body 1. At least one of the nozzle 3a before the rough application roll and the nozzle 3c after the application roll discharges and supplies the annealing separator slurry 4 to both surfaces or one surface of the strip 1 while swinging in this way. As a result, at least one of the nozzle 3a before the coarse application roll and the nozzle 3c after the application roll changes the relative positional relationship between the discharge port and the strip 1 along the width direction of the strip 1 over time. While changing, the annealing separator slurry 4 can be supplied to the strip 1.
　次に、上述した本発明の実施の形態１の第２の変形例に基づいた実施例と、従来技術に基づいた比較例とについて説明する。なお、本発明はこれらの実施例に限定されるものではない。 Next, an example based on the above-described second modification of the first embodiment of the present invention and a comparative example based on the prior art will be described. The present invention is not limited to these examples.
（実施例１～３０および比較例１）
　実施例１～３０および比較例１においては、まず、帯状体１として、ケイ素（Ｓｉ）を３．４重量％含有する最終板厚０．３ｍｍの方向性電磁鋼板の冷延板を用いる。そして、この帯状体１に対して脱炭焼鈍を行った後、上述した実施の形態１の第２の変形例によるスラリー塗布装置２２を用いて帯状体１に焼鈍分離剤スラリー４を塗布した。具体的には、粗塗布ロール前ノズル３ａおよび塗布ロール前ノズル３ｂによって、片面あたりの焼鈍分離剤スラリー４の塗布量をそれぞれ７．０ｇ／ｍ2の目付量として、帯状体１の両面に酸化マグネシウム（ＭｇＯ）を塗布する。続いて、帯状体１を巻き取ってコイル１０とした後、このコイル１０に対して１２００℃の温度条件で仕上げ焼鈍を行う。仕上げ焼鈍後、フラットニング焼鈍炉において、温度を８５０℃とした条件下において帯状体１の形状矯正を行う。そして、形状矯正がされた帯状体１に対して、長手方向に沿った形状不良の有無を目視によって検査した。 (Examples 1 to 30 and Comparative Example 1)
In Examples 1 to 30 and Comparative Example 1, first, a cold-rolled sheet of grain-oriented electrical steel sheet having a final sheet thickness of 0.3 mm containing 3.4% by weight of silicon (Si) is used as the strip 1. And after performing decarburization annealing with respect to this strip | belt body 1, the annealing separator slurry 4 was apply | coated to the strip | belt body 1 using the slurry application | coating apparatus 22 by the 2nd modification of Embodiment 1 mentioned above. Specifically, the coating amount of the annealing separator slurry 4 per one surface is oxidized on both surfaces of the strip 1 by setting the coating amount of the annealing separator slurry 4 per side to 7.0 g / m 2 by the nozzle 3a before the rough coating roll and the nozzle 3b before the coating roll. Apply magnesium (MgO). Then, after winding the strip | belt-shaped body 1 into the coil 10, finish annealing is performed with respect to this coil 10 on 1200 degreeC temperature conditions. After the finish annealing, the shape of the belt-like body 1 is corrected in a flattening annealing furnace at a temperature of 850 ° C. And the presence or absence of the shape defect along a longitudinal direction was test | inspected visually with respect to the strip | belt-shaped body 1 by which shape correction was carried out.
　これらの実施例１～３０において、焼鈍分離剤スラリー４を帯状体１の表面に塗布する際の、粗塗布ロール前ノズル３ａおよび塗布ロール前ノズル３ｂの少なくとも一方の揺動は、次のように行う。 In Examples 1 to 30, at least one of the pre-coating roll nozzle 3a and the pre-coating roll nozzle 3b swings when the annealing separator slurry 4 is applied to the surface of the strip 1 as follows. Do.
　実施例１～５においては、粗塗布ロール前ノズル３ａのみを、図４Ａに示すピッチＴをそれぞれ、１秒、２秒、６０秒、１２０秒、および１５０秒として揺動量の時間変化を正弦波状に制御し揺動させる。実施例６～１０においては、塗布ロール前ノズル３ｂのみを、図４Ａに示すピッチＴをそれぞれ、１秒、２秒、６０秒、１２０秒、および１５０秒として揺動量の時間変化を正弦波状に制御し揺動させる。実施例１１～１５においては、粗塗布ロール前ノズル３ａのみを、図４Ｃに示すピッチＴをそれぞれ、１秒、２秒、６０秒、１２０秒、および１５０秒として揺動量の時間変化を矩形波状に制御し揺動させる。実施例１６～２０においては、塗布ロール前ノズル３ｂのみを、図４Ｃに示すピッチＴをそれぞれ、１秒、２秒、６０秒、１２０秒、および１５０秒として揺動量の時間変化を矩形波状に制御し揺動させる。実施例２１～２５においては、粗塗布ロール前ノズル３ａおよび塗布ロール前ノズル３ｂをともに、図４Ａに示すピッチＴをそれぞれ、１秒、２秒、６０秒、１２０秒、および１５０秒として揺動量の時間変化を正弦波状に制御し揺動させる。実施例２６～３０においては、粗塗布ロール前ノズル３ａおよび塗布ロール前ノズル３ｂをともに、図４Ｃに示すピッチＴをそれぞれ、１秒、２秒、６０秒、１２０秒、および１５０秒として揺動量の時間変化を矩形波状に制御し揺動させる。また、比較例１においては、従来と同様に、粗塗布ロール前ノズル３ａおよび塗布ロール前ノズル３ｂを揺動させることなく、焼鈍分離剤スラリー４を帯状体１の表面に塗布する。表１は、以上の実施例１～３０および比較例１の結果を示す表である。 In Examples 1 to 5, only the nozzle 3a before the rough coating roll is used, and the pitch T shown in FIG. 4A is set to 1 second, 2 seconds, 60 seconds, 120 seconds, and 150 seconds, respectively. Control and swing. In Examples 6 to 10, only the nozzle 3b before the coating roll is used, and the pitch T shown in FIG. 4A is set to 1 second, 2 seconds, 60 seconds, 120 seconds, and 150 seconds, respectively, and the time variation of the swing amount is sinusoidal. Control and swing. In Examples 11 to 15, only the nozzle 3a before the coarse application roll is set to have a pitch T shown in FIG. 4C of 1 second, 2 seconds, 60 seconds, 120 seconds, and 150 seconds, respectively. Control and swing. In Examples 16 to 20, only the nozzle 3b before the application roll is set to have the pitch T shown in FIG. 4C as 1 second, 2 seconds, 60 seconds, 120 seconds, and 150 seconds, respectively, and the change over time in the amount of rocking is made into a rectangular wave shape. Control and swing. In Examples 21 to 25, both the coarse coating roll pre-nozzle nozzle 3a and the pre-coating roll nozzle 3b have the pitch T shown in FIG. 4A as 1 second, 2 seconds, 60 seconds, 120 seconds, and 150 seconds, respectively. The time change is controlled in a sine wave shape and oscillated. In Examples 26 to 30, both the coarse coating roll pre-nozzle nozzle 3a and the pre-coating roll nozzle 3b have the pitch T shown in FIG. 4C as 1 second, 2 seconds, 60 seconds, 120 seconds, and 150 seconds, respectively. The time change is controlled to a rectangular wave shape and oscillated. In Comparative Example 1, the annealing separator slurry 4 is applied to the surface of the strip 1 without swinging the nozzle 3a before the coarse application roll and the nozzle 3b before the application roll, as in the prior art. Table 1 is a table showing the results of Examples 1 to 30 and Comparative Example 1 described above.
Figure JPOXMLDOC01-appb-T000001
Figure JPOXMLDOC01-appb-T000001
　表１から、実施例１～３０においては、帯状体１である方向性電磁鋼板の形状不良の発生が全く無いか、従来に比して軽減されていることがわかる。これに対し、比較例１においては、形状不良が発生していることがわかる。これらの実施例１～３０と比較例１との比較から、実施例１～３０のように、粗塗布ロール前ノズル３ａおよび塗布ロール前ノズル３ｂの少なくとも一方を、帯状体１の幅方向に沿って帯状体１に対し相対的に揺動させることによって、方向性電磁鋼板における形状不良の発生を抑制できることがわかる。 From Table 1, it can be seen that in Examples 1 to 30, there is no occurrence of shape failure of the grain-oriented electrical steel sheet, which is the belt-like body 1, or it is reduced as compared with the prior art. In contrast, in Comparative Example 1, it can be seen that a shape defect has occurred. From comparison between Examples 1 to 30 and Comparative Example 1, as in Examples 1 to 30, at least one of the pre-coating roll pre-nozzle 3a and the pre-coating roll pre-nozzle 3b is set along the width direction of the strip 1. It can be seen that the occurrence of shape defects in the grain-oriented electrical steel sheet can be suppressed by swinging relative to the belt-like body 1.
　また、表１において、形状不良が軽減されている実施例と形状不良がない実施例とを比較すると、粗塗布ロール前ノズル３ａおよび塗布ロール前ノズル３ｂの少なくとも一方を、ピッチＴを２～１２０秒として揺動させつつ焼鈍分離剤スラリー４を塗布することによって、方向性電磁鋼板において形状不良が発生しなくなることがわかる。したがって、スラリー供給ノズル３の揺動におけるピッチＴは、２～１２０秒とするのが好ましいことがわかる。 Further, in Table 1, when an example in which the shape defect is reduced and an example in which there is no shape defect are compared, at least one of the nozzle before rough coating roll 3a and the nozzle before coating roll 3b is set to a pitch T of 2 to 120. It can be seen that by applying the annealing separator slurry 4 while being swung as seconds, shape defects do not occur in the grain-oriented electrical steel sheet. Accordingly, it can be seen that the pitch T in the oscillation of the slurry supply nozzle 3 is preferably 2 to 120 seconds.
（実施例３１～３６および比較例２）
　実施例３１～３６および比較例２においては、まず、帯状体１として、ケイ素（Ｓｉ）を３．４重量％含有する最終板厚０．２３ｍｍの方向性電磁鋼板の冷延板を用いる。そして、この帯状体１に対して脱炭焼鈍を行った後、上述した実施の形態１の第２の変形例によるスラリー塗布装置２２を用いて帯状体１に焼鈍分離剤スラリー４を塗布した。具体的には、粗塗布ロール前ノズル３ａおよび塗布ロール前ノズル３ｂによって、片面あたりの焼鈍分離剤スラリー４の塗布量をそれぞれ７．０ｇ／ｍ2の目付量として、帯状体１の両面に酸化マグネシウム（ＭｇＯ）を塗布する。続いて、帯状体１を巻き取ってコイル１０とした後、このコイル１０に対して１２００℃の温度条件で仕上げ焼鈍を行う。仕上げ焼鈍後、フラットニング焼鈍炉において、温度を８５０℃とした条件下において帯状体１の形状矯正を行う。そして、形状矯正がされた帯状体１に対して、長手方向に沿った形状不良の有無を目視によって検査した。 (Examples 31 to 36 and Comparative Example 2)
In Examples 31 to 36 and Comparative Example 2, first, a cold rolled sheet of a grain-oriented electrical steel sheet having a final sheet thickness of 0.23 mm containing 3.4% by weight of silicon (Si) is used as the strip 1. And after performing decarburization annealing with respect to this strip | belt body 1, the annealing separator slurry 4 was apply | coated to the strip | belt body 1 using the slurry application | coating apparatus 22 by the 2nd modification of Embodiment 1 mentioned above. Specifically, the coating amount of the annealing separator slurry 4 per one surface is oxidized on both surfaces of the strip 1 by setting the coating amount of the annealing separator slurry 4 per side to 7.0 g / m 2 by the nozzle 3a before the rough coating roll and the nozzle 3b before the coating roll. Apply magnesium (MgO). Then, after winding the strip | belt-shaped body 1 into the coil 10, finish annealing is performed with respect to this coil 10 on 1200 degreeC temperature conditions. After the finish annealing, the shape of the belt-like body 1 is corrected in a flattening annealing furnace at a temperature of 850 ° C. And the presence or absence of the shape defect along a longitudinal direction was test | inspected visually with respect to the strip | belt-shaped body 1 by which shape correction was carried out.
　これらの実施例３１～３６において、焼鈍分離剤スラリー４を帯状体１の表面に塗布する際に、粗塗布ロール前ノズル３ａは、以下のような技術思想に基づいて揺動させた。 In these Examples 31 to 36, when the annealing separator slurry 4 was applied to the surface of the strip 1, the coarse coating roll pre-nozzle 3 a was swung based on the following technical idea.
　本発明における焼鈍分離剤スラリー４の塗布ノズルを鋼板幅方向へ揺動させることによる効果は、塗布ノズルの配置に起因する焼鈍分離剤スラリー４の塗布量の微小な変動を鋼板幅方向に分散させることにより、鋼板上における焼鈍分離剤スラリー４の塗布量の均一化を促進することである。さらに、この鋼板は、焼鈍分離剤スラリー４を塗布後に巻き取られてコイルとなるため、このコイルの径方向に隣り合うもしくは隣接する焼鈍分離剤スラリー４の鋼板上における塗布量の組み合わせを一定にすることが一層望ましいと考えられる。 The effect of swinging the coating nozzle of the annealing separator slurry 4 in the present invention in the steel plate width direction is to disperse minute fluctuations in the coating amount of the annealing separator slurry 4 due to the arrangement of the coating nozzles in the steel plate width direction. This is to promote the homogenization of the coating amount of the annealing separator slurry 4 on the steel plate. Furthermore, since this steel sheet is wound after application of the annealing separator slurry 4 to form a coil, the combination of the coating amount on the steel sheet of the annealing separator slurry 4 adjacent to or adjacent to the radial direction of this coil is made constant. It is considered more desirable to do so.
　このような考え方に基づけば、鋼板のコイルのターンピッチを考慮したうえで、焼鈍分離剤スラリー４の塗布ノズルの揺動周期を変動させることが望ましいと想起される。本実施例では、上記塗布ノズルを、１ターンピッチ毎に１周期、揺動させるのではなく、２ターンピッチ毎に１周期、揺動させる。これにより、コイル状態の鋼板の層間における焼鈍分離剤スラリー４の塗布量の合計が鋼板幅方向について一層均質化できる可能性があることを、本発明者等は見出した。 Based on this concept, it is recalled that it is desirable to change the oscillation period of the coating nozzle of the annealing separator slurry 4 in consideration of the turn pitch of the coil of the steel plate. In this embodiment, the coating nozzle is not swung for one cycle every one turn pitch, but is swung for one cycle every two turn pitches. As a result, the present inventors have found that there is a possibility that the total amount of the annealing separator slurry 4 applied between the layers of the coiled steel sheet may be further homogenized in the width direction of the steel sheet.
　そこで、実施例３１～３６においては、帯状体１のラインスピードＶとコイル１０のターンピッチＬの２倍との比（Ｖ／２Ｌ）をターンピッチ周波数（単位は［Ｈｚ］）として定義し、ターンピッチ周波数が０．６６５ＨｚとなるようにラインスピードＶおよびコイル１０のコイル径を設定した。このとき、粗塗布ロール前ノズル３ａの揺動周波数を０．０１０Ｈｚ～１．０００Ｈｚの範囲内で変更して、帯状体１の表面に焼鈍分離剤スラリー４を塗布した。また、粗塗布ロール前ノズル３ａの揺動量の時間変化は、正弦波状に制御した。一方、比較例２においては、従来と同様に、粗塗布ロール前ノズル３ａを揺動させることなく、焼鈍分離剤スラリー４を帯状体１の表面に塗布した。以上の実施例３１～３６および比較例２の各々における帯状体１の形状不良の検査結果を表２に示す。 Therefore, in Examples 31 to 36, the ratio (V / 2L) of the line speed V of the strip 1 to twice the turn pitch L of the coil 10 is defined as the turn pitch frequency (unit: [Hz]). The line speed V and the coil diameter of the coil 10 were set so that the turn pitch frequency was 0.665 Hz. At this time, the oscillation separating agent slurry 4 was applied to the surface of the strip 1 by changing the oscillation frequency of the nozzle 3a before the rough application roll within a range of 0.010 Hz to 1.000 Hz. Moreover, the time change of the rocking | fluctuation amount of the nozzle 3a before a rough application roll was controlled to the sine wave form. On the other hand, in Comparative Example 2, the annealing separator slurry 4 was applied to the surface of the strip 1 without swinging the nozzle 3a before the rough application roll, as in the prior art. Table 2 shows the inspection results of the shape defects of the band 1 in each of the above Examples 31 to 36 and Comparative Example 2.
Figure JPOXMLDOC01-appb-T000002
Figure JPOXMLDOC01-appb-T000002
　表２から、実施例３１～３６において、帯状体１（方向性電磁鋼板）の形状不良の発生が全く無い、あるいは、従来に比して軽減されていることがわかる。さらに、実施例３１～３３において、粗塗布ロール前ノズル３ａの揺動周波数が、ターンピッチ周波数に近づく条件、すなわち、０．６６５Ｈｚと同値またはその近傍である場合、帯状体１の形状不良が発生しなくなることがわかる。これに対し、比較例２においては、帯状体１の形状不良が発生していることがわかる。 From Table 2, it can be seen that in Examples 31 to 36, there is no occurrence of the shape defect of the band 1 (orientated electrical steel sheet), or it is reduced as compared with the prior art. Further, in Examples 31 to 33, when the oscillation frequency of the nozzle 3a before the rough coating roll is close to the turn pitch frequency, that is, the same value as or close to 0.665 Hz, the shape defect of the band 1 occurs. You can see that it will not. On the other hand, in Comparative Example 2, it can be seen that the shape defect of the belt-like body 1 occurs.
　なお、実施例３１～３６において、粗塗布ロール前ノズル３ａの揺動量の時間変化は、正弦波状に制御していたが、この揺動量の時間変化を矩形波状または三角形波状に制御した場合であっても、帯状体１の形状不良の検査結果に違いは見られなかった。 In Examples 31 to 36, the change over time of the swing amount of the pre-coating roll nozzle 3a was controlled in a sine wave shape, but this was a case where the change over time in the swing amount was controlled in a rectangular wave shape or a triangular wave shape. However, no difference was found in the inspection result of the shape defect of the band 1.
　また、実施例３１～３６では、ターンピッチ周波数が０．６６５Ｈｚである場合の結果を示したが、ターンピッチ周波数が０．６６５Ｈｚ以外の値であっても、粗塗布ロール前ノズル３ａの揺動周波数をターンピッチ周波数に近づけることにより、ターンピッチ周波数が０．６６５Ｈｚである場合と同様の結果が得られた。 Further, in Examples 31 to 36, the result in the case where the turn pitch frequency is 0.665 Hz is shown. However, even if the turn pitch frequency is a value other than 0.665 Hz, the oscillation of the nozzle 3a before the rough coating roll is performed. By bringing the frequency closer to the turn pitch frequency, the same result as that obtained when the turn pitch frequency was 0.665 Hz was obtained.
　さらに、実施例３１～３６では、上述したようにターンピッチの２倍をもとにターンピッチ周波数を設定し、このターンピッチ周波数に基づいて粗塗布ロール前ノズル３ａの揺動を制御した。これにより、表２に示すような良好な結果を得たが、このような考え方を敷衍した塗布条件、すなわち、ターンピッチの偶数倍をもとにターンピッチ周波数を設定し、このように設定したターンピッチ周波数に合わせて粗塗布ロール前ノズル３ａを揺動させた場合も同様に効果があった。 Further, in Examples 31 to 36, the turn pitch frequency was set based on twice the turn pitch as described above, and the oscillation of the pre-coating roll nozzle 3a was controlled based on this turn pitch frequency. As a result, good results as shown in Table 2 were obtained, but the turn pitch frequency was set based on coating conditions based on such a concept, that is, an even multiple of the turn pitch. The same effect was obtained when the rough coating roll pre-nozzle 3a was swung according to the turn pitch frequency.
　以上説明した本発明の実施の形態１によれば、スラリー供給ノズル３を用いて焼鈍分離剤スラリー４を帯状体１の表面に塗布する際に、スラリー供給ノズル３を帯状体１の幅方向に沿って揺動させていることにより、この幅方向に沿った焼鈍分離剤スラリー４の膜厚分布の不均一性をなだらかにしたり、帯状体１を巻き取ってコイル１０とした場合においても、ビルトアップを防止したりすることができる。このため、鋼板の製造において平坦化焼鈍後に生じやすい、鋼板の長手方向に沿った皺状の形状不良の発生、すなわち、上述した帯状体１における形状不良の発生を抑制することが可能となる。この結果、鋼板の製造における歩留まりを向上することができる。 According to the first embodiment of the present invention described above, when the annealing separator slurry 4 is applied to the surface of the strip 1 using the slurry supply nozzle 3, the slurry supply nozzle 3 is arranged in the width direction of the strip 1. By swinging along the width direction, the unevenness of the film thickness distribution of the annealing separator slurry 4 along the width direction can be made smooth, or even when the strip 1 is wound up to form the coil 10, Can be prevented. For this reason, it becomes possible to suppress generation | occurrence | production of the saddle-like shape defect along the longitudinal direction of a steel plate which is easy to occur after planarization annealing in manufacture of a steel plate, ie, generation | occurrence | production of the shape defect in the strip | belt-shaped body 1 mentioned above. As a result, the yield in the manufacture of the steel sheet can be improved.
（実施の形態２）
　次に、本発明の実施の形態２について説明する。上述した実施の形態１では、帯状体１の幅方向に沿って、スラリー供給ノズル３などのスラリー吐出手段を帯状体１に対し相対的に揺動させ、これにより、帯状体１とスラリー吐出手段との相対位置関係を帯状体１の幅方向に沿って時間変化させつつ、帯状体１に焼鈍分離剤スラリー４を供給していた。これに対し、本実施の形態２では、帯状体１の幅方向に沿って、帯状体１をスラリー吐出手段に対し相対的に揺動させ、これにより、帯状体１とスラリー吐出手段との相対位置関係を帯状体１の幅方向に沿って時間変化させつつ、帯状体１に焼鈍分離剤スラリー４を供給している。 (Embodiment 2)
Next, a second embodiment of the present invention will be described. In the first embodiment described above, the slurry discharge means such as the slurry supply nozzle 3 is swung relative to the band 1 along the width direction of the band 1 so that the band 1 and the slurry discharge means The annealing separator slurry 4 was supplied to the band 1 while changing the relative positional relationship with the time along the width direction of the band 1. On the other hand, in the second embodiment, the belt-like body 1 is swung relative to the slurry discharge means along the width direction of the belt-like body 1 so that the belt-like body 1 and the slurry discharge means are relatively moved. The annealing separator slurry 4 is supplied to the band 1 while changing the positional relationship along the width direction of the band 1 over time.
　まず、本発明の実施の形態２に係るスラリー塗布装置について説明する。図８は、本発明の実施の形態２に係るスラリー塗布装置の一構成例を示す図である。 First, a slurry coating apparatus according to Embodiment 2 of the present invention will be described. FIG. 8 is a diagram illustrating a configuration example of the slurry applying apparatus according to the second embodiment of the present invention.
　図８に示すように、本実施の形態２に係るスラリー塗布装置３０は、鋼板に焼鈍分離剤スラリーを塗布する装置であり、スクイーズロール１２、スラリー供給ノズル１３、および帯状体搬送ロール１５を有する。スラリー供給ノズル１３は、方向性電磁鋼板である帯状体１に対して焼鈍分離剤スラリー４を供給する複数の吐出口を有するスラリー吐出手段である。スクイーズロール１２は、帯状体１をその厚さ方向に挟持するとともに帯状体１上に塗布された焼鈍分離剤スラリー４を所定の厚さまで絞る、一対の塗布手段である。また、帯状体搬送ロール１５は、例えば円柱状に構成されているとともに、円柱における円の中心軸の周りで自転することにより、帯状体１を搬送可能に構成されている帯状体搬送手段である。なお、詳細は後述するが、本実施の形態２におけるスクイーズロール１２および帯状体搬送ロール１５は、帯状体１の面に概ね平行であり且つ帯状体１の走行方向に対して概ね直角な方向、すなわち帯状体１の幅方向に、スラリー吐出手段に対し相対的に帯状体１を揺動可能に構成された帯状体揺動手段である。 As shown in FIG. 8, the slurry applying apparatus 30 according to the second embodiment is an apparatus that applies an annealing separator slurry to a steel plate, and includes a squeeze roll 12, a slurry supply nozzle 13, and a belt-like body transport roll 15. . The slurry supply nozzle 13 is a slurry discharge means having a plurality of discharge ports for supplying the annealing separator slurry 4 to the strip 1 that is a grain-oriented electrical steel sheet. The squeeze roll 12 is a pair of coating means that sandwich the strip 1 in the thickness direction and squeeze the annealing separator slurry 4 applied on the strip 1 to a predetermined thickness. The belt-shaped body transporting roll 15 is a belt-shaped body transporting unit configured to be able to transport the belt-shaped body 1 by rotating around the center axis of a circle in the column, for example, in a cylindrical shape. . Although details will be described later, the squeeze roll 12 and the belt-like body transporting roll 15 in the second embodiment are substantially parallel to the surface of the belt-like body 1 and substantially perpendicular to the traveling direction of the belt-like body 1, That is, the strip-shaped body swinging means is configured to be able to swing the strip-shaped body 1 relative to the slurry discharge means in the width direction of the strip-shaped body 1.
　このように構成されたスラリー塗布装置３０を用いた焼鈍分離剤スラリー４の塗布においては、まず、スラリー供給ノズル１３が帯状体１の表面に焼鈍分離剤スラリー４を吐出供給する。続いて、スクイーズロール１２が、帯状体１をその厚さ方向に把持しつつ押圧して、帯状体１の表面に塗布された焼鈍分離剤スラリー４を、所定の膜厚まで絞る。その後、帯状体１は、仕上げ焼鈍工程（２次再結晶焼鈍工程）、コーティング工程、およびフラットニング焼鈍工程などの種々の工程を経て、最終的に電磁鋼板の製品となる。 In the application of the annealing separator slurry 4 using the slurry coating apparatus 30 configured as described above, first, the slurry supply nozzle 13 discharges and supplies the annealing separator slurry 4 to the surface of the strip 1. Subsequently, the squeeze roll 12 is pressed while holding the strip 1 in its thickness direction, and the annealing separator slurry 4 applied to the surface of the strip 1 is squeezed to a predetermined thickness. After that, the strip 1 is subjected to various processes such as a finish annealing process (secondary recrystallization annealing process), a coating process, and a flattening annealing process, and finally becomes a product of an electromagnetic steel sheet.
　本実施の形態２においても、本発明者らは、上述した実施の形態１と同様にフラットニング焼鈍工程後の帯状体１の表面に形成される皺状の形状不良について検討を行った。その結果、本発明者らは、形状不良に関して、帯状体１の幅方向に沿った発生位置とスラリー供給ノズル１３の幅方向に沿った設置位置との間に、一定の相関が認められることを知見した。そして、本発明者らは、焼鈍分離剤スラリー４の膜厚が帯状体１の幅方向に沿って不均一な分布を生じていることに着目し、この膜厚分布が形状不良に影響していることを想起するに至った。 Also in the present second embodiment, the present inventors examined the saddle-like shape defect formed on the surface of the strip 1 after the flattening annealing step, as in the first embodiment. As a result, the present inventors have found that a certain correlation is recognized between the generation position along the width direction of the strip 1 and the installation position along the width direction of the slurry supply nozzle 13 with respect to the shape defect. I found out. Then, the inventors pay attention to the fact that the film thickness of the annealing separator slurry 4 has a non-uniform distribution along the width direction of the strip 1, and this film thickness distribution affects the shape defect. I came to remember.
　上述した図２に示したように、従来のスラリー塗布装置１００のスラリー供給ノズル１０３が焼鈍分離剤スラリー４を帯状体１の表面に供給すると、焼鈍分離剤スラリー４の膜厚は、スラリー供給ノズル１０３のそれぞれの吐出口に近い位置では大きくなり、遠い位置では小さくなる。このため、従来のスラリー塗布装置１００においては、上述したように、帯状体１の幅方向に沿った焼鈍分離剤スラリー４の膜厚分布と帯状体１の長手方向に沿った焼鈍分離剤スラリー４の膜厚分布とを制御していた。これにより、帯状体１の表面における焼鈍分離剤スラリー４の膜厚の厚薄差は所定範囲内に収まる。ところが、このように焼鈍分離剤スラリー４の膜厚の厚薄差を所定範囲内に収めても、上述した皺状の形状不良の発生は回避できなかった。 As shown in FIG. 2 described above, when the slurry supply nozzle 103 of the conventional slurry application apparatus 100 supplies the annealing separator 4 to the surface of the strip 1, the film thickness of the annealing separator slurry 4 is determined by the slurry supply nozzle. 103 becomes larger at a position close to each of the discharge ports, and becomes smaller at a position far away. For this reason, in the conventional slurry coating apparatus 100, as described above, the film thickness distribution of the annealing separator slurry 4 along the width direction of the strip 1 and the annealing separator slurry 4 along the longitudinal direction of the strip 1. The film thickness distribution was controlled. Thereby, the thickness difference of the film thickness of the annealing separator slurry 4 on the surface of the strip 1 is within a predetermined range. However, even if the thickness difference of the film thickness of the annealing separator slurry 4 falls within a predetermined range as described above, the occurrence of the above-described bowl-shaped shape defect cannot be avoided.
　本発明者らの知見によれば、膜厚が比較的大きい山部と膜厚が比較的小さい谷部とからなる焼鈍分離剤スラリー４の塗布むらは、上述したように、スラリー供給ノズル１０３の吐出口の位置に起因するため、不可避な現象であると考えられる。 According to the knowledge of the present inventors, the application unevenness of the annealing separator slurry 4 composed of a crest portion having a relatively large film thickness and a trough portion having a relatively small film thickness is as described above. Since this is caused by the position of the discharge port, it is considered to be an inevitable phenomenon.
　そこで、本発明者らはさらに鋭意検討を重ね、焼鈍分離剤スラリー４の塗布むらが、形状不良の発生に与える影響についてさらに検討を行った。その結果、本発明者らは、上述した実施の形態１と同様に、不可避である帯状体１の幅方向に沿った焼鈍分離剤スラリー４の不均一な膜厚分布の発生を完全に抑制するよりも、不均一な膜厚分布の発生を前提として、その膜厚分布を可能な限りなだらかにしたり、帯状体１をコイルにした際のビルドアップを抑制したりすることができれば、形状不良の発生を抑制できることを想起した。 Therefore, the present inventors conducted further intensive studies, and further examined the influence of uneven application of the annealing separator slurry 4 on the occurrence of shape defects. As a result, the present inventors completely suppress the occurrence of non-uniform film thickness distribution of the annealing separator slurry 4 along the width direction of the strip 1 that is unavoidable, as in the first embodiment. If it is possible to make the film thickness distribution as gentle as possible or to suppress the build-up when the strip 1 is made into a coil, assuming that a non-uniform film thickness distribution occurs, Recalling that the occurrence can be suppressed.
　従って、本発明の実施の形態２に係るスラリー塗布装置３０は、図８に示すように、スクイーズロール１２および帯状体搬送ロール１５によって、帯状体１を、帯状体１の面に平行であり且つ帯状体１の走行方向に対して直角な方向、すなわち帯状体１の幅方向に沿ってスラリー供給ノズル１３に対し相対的に揺動させる構成を採用する。このようなスラリー塗布装置３０において、スクイーズロール１２および帯状体搬送ロール１５が、帯状体１の幅方向に沿ってスラリー供給ノズル１３に対し相対的に帯状体１を揺動しつつ、スラリー供給ノズル１３が、この揺動とともに走行する帯状体１の表面に焼鈍分離剤スラリー４を吐出供給する。これにより、スラリー供給ノズル１３は、その吐出口と帯状体１との相対的な位置関係を帯状体１の幅方向に沿って経時的に変化させながら、帯状体１に対して焼鈍分離剤スラリー４を供給することができる。 Therefore, as shown in FIG. 8, the slurry application device 30 according to the second exemplary embodiment of the present invention causes the band 1 to be parallel to the surface of the band 1 by the squeeze roll 12 and the band transport roll 15. A configuration is adopted in which the slurry supply nozzle 13 is swung relative to the direction perpendicular to the traveling direction of the strip 1, that is, along the width direction of the strip 1. In such a slurry application device 30, the squeeze roll 12 and the belt-like body transporting roll 15 swing the belt-like body 1 relative to the slurry supply nozzle 13 along the width direction of the belt-like body 1, and the slurry supply nozzle 13 discharges and supplies the annealing separator slurry 4 to the surface of the belt-like body 1 that travels with this rocking motion. Thereby, the slurry supply nozzle 13 changes the relative positional relationship between the discharge port and the strip 1 along the width direction of the strip 1 over time, while annealing separator slurry with respect to the strip 1. 4 can be supplied.
　図９Ａ、図９Ｂ、および図９Ｃはいずれも、スクイーズロール１２および帯状体搬送ロール１５によって帯状体１を揺動させる際の、帯状体１に対する揺動制御における揺動量の時間変化の例を示すグラフである。また、図１０は、本発明の実施の形態２に係るスラリー塗布装置と、帯状体に対して正弦波状に揺動制御を行った場合の帯状体表面の焼鈍分離剤スラリーの膜厚分布とを示す概念図である。図１０には、このスラリー塗布装置３０の構成図と、図９Ａに示すグラフに基づいて帯状体１に対して揺動制御を行った場合の、帯状体１の幅方向に沿った焼鈍分離剤スラリー４の膜厚分布を示すグラフとが示される。 9A, FIG. 9B, and FIG. 9C each show an example of the change over time of the swing amount in the swing control for the strip 1 when the strip 1 is swung by the squeeze roll 12 and the strip transport roll 15. It is a graph. Further, FIG. 10 shows the slurry coating apparatus according to Embodiment 2 of the present invention and the film thickness distribution of the annealing separator slurry on the surface of the band when the band is subjected to sine wave swing control. FIG. In FIG. 10, the annealing separation agent along the width direction of the strip | belt-shaped body 1 at the time of performing rocking | fluctuation control with respect to the strip | belt-shaped body 1 based on the block diagram of this slurry application | coating apparatus 30, and the graph shown to FIG. 9A. A graph showing the film thickness distribution of the slurry 4 is shown.
　スクイーズロール１２および帯状体搬送ロール１５は、帯状体１をその幅方向に沿って、図９Ａに示すように正弦波状に揺動させたり、図９Ｂに示すように三角形波状に揺動させたりする。これにより、図１０における焼鈍分離剤スラリー４の膜厚分布のグラフに示す破線部と実線部とを比較して分かるように、帯状体１の幅方向に沿った焼鈍分離剤スラリー４の膜厚分布は、上述した帯状体１を揺動させずに搬送させた状態で焼鈍分離剤スラリー４を吐出する従来の場合（図２および図１０のグラフ中の破線部参照）に比してなだらかになる。ここで、図１０に示す帯状体１の揺動幅としては、スラリー供給ノズル１３の複数の吐出口のうちの隣り合う吐出口の間隔に対して、１／２程度にすることが望ましい。これにより、スラリー供給ノズル１３の複数の吐出口の間において、焼鈍分離剤スラリー４の供給を帯状体１の幅方向に対して平均化させることができる。 The squeeze roll 12 and the belt-like body transporting roll 15 swing the belt-like body 1 along the width direction in a sine wave shape as shown in FIG. 9A or in a triangular wave shape as shown in FIG. 9B. . Thereby, the film thickness of the annealing separator slurry 4 along the width direction of the strip 1 can be understood by comparing the broken line portion and the solid line portion shown in the graph of the film thickness distribution of the annealing separator slurry 4 in FIG. The distribution is gentle compared to the conventional case (see the broken line portion in the graphs of FIGS. 2 and 10) in which the annealing separator slurry 4 is discharged in a state where the belt-like body 1 is conveyed without being swung. Become. Here, it is desirable that the rocking width of the strip 1 shown in FIG. 10 is about ½ of the interval between the adjacent discharge ports of the slurry supply nozzle 13. Thereby, the supply of the annealing separator slurry 4 can be averaged with respect to the width direction of the strip 1 between the plurality of discharge ports of the slurry supply nozzle 13.
　また、図９Ａおよび図９Ｂに示す帯状体１の揺動周期としてのピッチＴは、１～１５０秒、好適には、２～１２０秒とするのが望ましい。これにより、図２に示す焼鈍分離剤スラリー４の膜厚分布の不均一性に比して、図１０に示すように、焼鈍分離剤スラリー４が帯状体１の表面に緩やかに塗布されて焼鈍分離剤スラリー４の谷部と山部とが緩やかに形成される。したがって、焼鈍分離剤スラリー４の膜厚分布における厚薄差が緩和されてなだらかになり、この結果、帯状体１の表面における形状不良の発生を防止することができる。なお、実際には、帯状体１に対して三角形波状の揺動制御を行う場合、揺動機構の制約によって、図９Ｂに示すように、三角形波状の折り返し端部が滑らかな略三角形波状の波形になったり、この端部において有限時間停止させると台形波状になったりする場合もあるが、これらの揺動も三角形波状の揺動に含まれる。 Also, the pitch T as the oscillation period of the strip 1 shown in FIGS. 9A and 9B is preferably 1 to 150 seconds, and preferably 2 to 120 seconds. Accordingly, as shown in FIG. 10, the annealing separator slurry 4 is gently applied to the surface of the strip 1 and annealed as compared to the non-uniformity of the film thickness distribution of the annealing separator slurry 4 shown in FIG. Valleys and peaks of the separating agent slurry 4 are gently formed. Therefore, the thickness difference in the film thickness distribution of the annealing separator slurry 4 is relaxed, and as a result, the occurrence of shape defects on the surface of the strip 1 can be prevented. Actually, when performing the triangular wave-like swing control on the band-like body 1, due to the restriction of the swing mechanism, as shown in FIG. 9B, the triangular wave-like folded end has a substantially triangular wave-like waveform. Or a trapezoidal wave when stopped at this end for a finite period of time, these oscillations are also included in the triangular wave oscillation.
　また、図１１Ａは、本発明の実施の形態２に係るスラリー塗布装置と、帯状体に対して矩形波状に揺動制御を行った場合の帯状体表面の焼鈍分離剤スラリーの膜厚分布とを示す概念図である。図１１Ａには、スラリー塗布装置３０の構成図と、図９Ｃに示すグラフに基づいて帯状体１に対して揺動制御を行った場合における帯状体１表面の焼鈍分離剤スラリー４の２層分の膜厚分布を示すグラフとが示される。図１１Ｂは、本発明の実施の形態２における焼鈍分離剤スラリーが塗布された帯状体をコイルにした状態の部分拡大断面図である。図１１Ｂには、帯状体１の表面に図１１Ａに示すように焼鈍分離剤スラリー４を塗布した後、コイル状に巻き取って図３Ａに示すコイル１０とした場合における、図３Ｂに対応するコイル１０の積層構造が示される。 FIG. 11A shows the slurry coating apparatus according to Embodiment 2 of the present invention and the film thickness distribution of the annealing separator slurry on the surface of the band when the band-shaped rocking control is performed on the band. FIG. FIG. 11A shows two layers of the annealing separator slurry 4 on the surface of the band 1 when the swing control is performed on the band 1 based on the configuration diagram of the slurry application device 30 and the graph shown in FIG. 9C. And a graph showing the film thickness distribution. FIG. 11B is a partially enlarged cross-sectional view of a state in which a strip-like body coated with the annealing separator slurry in Embodiment 2 of the present invention is coiled. FIG. 11B shows a coil corresponding to FIG. 3B when the surface of the strip 1 is coated with the annealing separator slurry 4 as shown in FIG. 11A and then wound into a coil to form the coil 10 shown in FIG. 3A. Ten stacked structures are shown.
　図９Ｃに示すように、帯状体１が、帯状体１の幅方向に沿って矩形波状に揺動すると、図１１Ａの膜厚分布のグラフに示すように、帯状体１をコイル１０にした際に、積層した帯状体１における２段の層の間で、焼鈍分離剤スラリー４の山部と谷部とが重なる。ここで、帯状体１の揺動幅は、スラリー供給ノズル１３の複数の吐出口のうちの、隣り合う吐出口の間隔の１／２程度にすることが望ましい。 As shown in FIG. 9C, when the strip 1 swings in a rectangular wave shape along the width direction of the strip 1, when the strip 1 is turned into the coil 10 as shown in the graph of the film thickness distribution in FIG. In addition, the crests and troughs of the annealing separator slurry 4 overlap between the two layers in the laminated strip 1. Here, it is desirable that the swinging width of the belt-like body 1 is about ½ of the interval between adjacent discharge ports among the plurality of discharge ports of the slurry supply nozzle 13.
　また、図９Ｃに示す帯状体１の揺動周期であるピッチＴは、１～１５０秒、好適には、２～１２０秒とするのが望ましい。これは、帯状体１の揺動量の時間変化を矩形波状に制御する場合のピッチＴが１秒より短すぎると、図２に示すような焼鈍分離剤スラリー４の膜厚分布の不均一性が残存し、１５０秒より長すぎると帯状体１をコイル１０とした際の一巻きごとのずれ量が小さくなって、２層間で焼鈍分離剤スラリー４の山部と谷部とが適切に重ならず、図３Ｂに示すビルドアップが生じるためである。なお、実際には、帯状体１に対して矩形波状に揺動制御を行う場合、帯状体１の移動速度は有限であって帯状体１をその幅方向に沿って瞬時に移動させることが困難なので、帯状体１の揺動自体は略台形波状になるが、このような揺動の制御も矩形波状の揺動に含まれる。 Also, the pitch T, which is the oscillation cycle of the strip 1 shown in FIG. 9C, is preferably 1 to 150 seconds, and preferably 2 to 120 seconds. This is because if the pitch T in the case of controlling the change in the amount of fluctuation of the strip 1 in a rectangular wave shape is too shorter than 1 second, the film thickness distribution of the annealing separator slurry 4 as shown in FIG. If it remains and is longer than 150 seconds, the amount of deviation per turn when the strip 1 is used as the coil 10 is small, and the peaks and valleys of the annealing separator slurry 4 are appropriately overlapped between the two layers. This is because the build-up shown in FIG. 3B occurs. Actually, when swing control is performed on the strip 1 in a rectangular wave shape, the moving speed of the strip 1 is finite and it is difficult to move the strip 1 instantaneously along its width direction. Therefore, the oscillation of the strip 1 itself has a substantially trapezoidal wave shape, but such control of the oscillation is also included in the rectangular wave oscillation.
　これにより、図１１Ｂに示すように、焼鈍分離剤スラリー４の膜厚分布における山部と谷部とが、コイル１０における帯状体１の長手方向に沿った断面の円の径方向に沿って順次交互に積層されるので、上述したビルドアップを防止することができる。したがって、帯状体１における形状不良の発生を抑制することができる。 Thus, as shown in FIG. 11B, the peaks and valleys in the film thickness distribution of the annealing separator slurry 4 are sequentially along the radial direction of the circle of the cross section along the longitudinal direction of the strip 1 in the coil 10. Since the layers are alternately stacked, the build-up described above can be prevented. Therefore, it is possible to suppress the occurrence of a shape defect in the band 1.
（実施の形態２の変形例）
　次に、上述した実施の形態２による装置構成を適用可能な、分離剤塗布工程におけるスラリー塗布装置の構成について説明する。図１２Ａ、図１２Ｂ、および図１２Ｃはそれぞれ、本実施の形態２に係るスラリー塗布装置の第１の変形例、第２の変形例、および第３の変形例を示す構成図である。 (Modification of Embodiment 2)
Next, the configuration of the slurry coating apparatus in the separating agent coating process to which the apparatus configuration according to the second embodiment described above can be applied will be described. 12A, FIG. 12B, and FIG. 12C are configuration diagrams respectively showing a first modification, a second modification, and a third modification of the slurry applying apparatus according to the second embodiment.
（実施の形態２の第１の変形例）
　図１２Ａに示すように、本実施の形態２の第１の変形例に係るスラリー塗布装置３１は、一対の粗塗布ロール１２ａ、一対のバックアップロール１２ｂ、一対の塗布ロール１２ｃ、および一対の粗塗布ロール前ノズル１３ａを有する。一対の粗塗布ロール前ノズル１３ａは、焼鈍分離剤スラリー４を帯状体１の両表面に吐出する一対のスラリー吐出手段である。一対の粗塗布ロール１２ａは、帯状体１をその厚さ方向に把持しつつ押圧（挟持）して、粗塗布ロール前ノズル１３ａが供給する焼鈍分離剤スラリー４を帯状体１の両表面に粗塗りする一対の塗布手段である。一対の塗布ロール１２ｃは、帯状体１の両面側に設けられた一対のバックアップロール１２ｂによって支持され、帯状体１をその厚さ方向に把持しつつ押圧（挟持）して、粗塗りされた焼鈍分離剤スラリー４を絞る第２の一対の塗布手段である。そして、この第１の変形例によるスラリー塗布装置３１においては、帯状体搬送ロール（図示せず）、粗塗布ロール１２ａおよび塗布ロール１２ｃと、必要に応じてバックアップロール１２ｂとが、帯状体揺動手段として、帯状体１とともに、帯状体１の幅方向（図１２Ａ中、紙面垂直方向）に沿って、粗塗布ロール前ノズル１３ａに対し相対的に揺動可能に構成されている。このような帯状体揺動手段が、帯状体１の幅方向に沿って粗塗布ロール前ノズル１３ａに対し相対的に帯状体１を揺動しつつ、粗塗布ロール前ノズル１３ａが、この揺動とともに走行する帯状体１の両表面に焼鈍分離剤スラリー４を吐出供給する。これにより、粗塗布ロール前ノズル１３ａは、その吐出口と帯状体１との相対的な位置関係を帯状体１の幅方向に沿って経時的に変化させながら、帯状体１に対して焼鈍分離剤スラリー４を供給することができる。 (First Modification of Embodiment 2)
As shown in FIG. 12A, the slurry coating apparatus 31 according to the first modification of the second embodiment includes a pair of rough coating rolls 12a, a pair of backup rolls 12b, a pair of coating rolls 12c, and a pair of rough coatings. It has a pre-roll nozzle 13a. The pair of pre-rough application roll nozzles 13 a are a pair of slurry discharge means for discharging the annealing separator slurry 4 to both surfaces of the strip 1. The pair of rough coating rolls 12a presses (nips) the belt-shaped body 1 while gripping the belt-shaped body 1 in the thickness direction, and roughens the annealing separator slurry 4 supplied by the nozzle 13a before the rough coating roll on both surfaces of the belt-shaped body 1. It is a pair of application means to apply. The pair of application rolls 12c are supported by a pair of backup rolls 12b provided on both sides of the strip 1 and are pressed (sandwiched) while gripping the strip 1 in the thickness direction to perform rough coating annealing. It is a second pair of application means for squeezing the separating agent slurry 4. And in the slurry application apparatus 31 by this 1st modification, a strip | belt-shaped object conveyance roll (not shown), the rough application roll 12a and the application | coating roll 12c, and the backup roll 12b as needed rock | fluctuate a strip | belt-shaped object. As a means, it is configured to be able to swing relative to the pre-rough coating roll nozzle 13 a along the width direction of the band 1 (in FIG. 12A, the direction perpendicular to the paper surface). While such a belt-like body swinging means swings the belt-like body 1 relative to the coarse coating roll pre-nozzle 13a along the width direction of the belt-like body 1, the coarse coating roll pre-roller nozzle 13a swings. The annealing separator slurry 4 is discharged and supplied to both surfaces of the strip 1 that travels with the belt. Thereby, the nozzle 13a before the rough coating roll is annealed and separated from the strip 1 while changing the relative positional relationship between the discharge port and the strip 1 along the width direction of the strip 1 over time. The agent slurry 4 can be supplied.
（実施の形態２の第２の変形例）
　また、図１２Ｂに示すように、本実施の形態２の第２の変形例に係るスラリー塗布装置３２は、上述した第１の変形例によるスラリー塗布装置３１と同様の構成を有し、さらに、帯状体１の走行方向に沿って、スラリー吐出手段としての粗塗布ロール前ノズル１３ａの下流側、かつ一対の塗布ロール１２ｃの上流側において、帯状体１の一方の面側に、第２のスラリー吐出手段としての塗布ロール前ノズル１３ｂを有する。そして、このスラリー塗布装置３２においても、帯状体搬送ロール（図示せず）、粗塗布ロール１２ａおよび塗布ロール１２ｃと、必要に応じてバックアップロール１２ｂとが、帯状体揺動手段として、帯状体１とともに、帯状体１の幅方向（図１２Ｂ中、紙面垂直方向）に沿って、粗塗布ロール前ノズル１３ａに対し相対的に揺動可能に構成されている。このような帯状体揺動手段が、帯状体１の幅方向に沿って粗塗布ロール前ノズル１３ａおよび塗布ロール前ノズル１３ｂに対し相対的に帯状体１を揺動しつつ、粗塗布ロール前ノズル１３ａおよび塗布ロール前ノズル１３ｂが、この揺動とともに走行する帯状体１の両表面または一方の面に焼鈍分離剤スラリー４を吐出供給する。これにより、粗塗布ロール前ノズル１３ａおよび塗布ロール前ノズル１３ｂは、自身の吐出口と帯状体１との相対的な位置関係を帯状体１の幅方向に沿って経時的に変化させながら、帯状体１に対して焼鈍分離剤スラリー４を供給することができる。ここで、実施の形態１の第２の変形例の場合と同様、粗塗布ロール前ノズル１３ａまたは塗布ロール前ノズル１３ｂのいずれか一方がスクイーズロールと一体的に揺動され、すなわち、粗塗布ロール前ノズル１３ａまたは塗布ロール前ノズル１３ｂのいずれか一方のみが帯状体１に対して相対的に揺動するようにしても良い。 (Second Modification of Embodiment 2)
As shown in FIG. 12B, the slurry application device 32 according to the second modification of the second embodiment has the same configuration as the slurry application device 31 according to the first modification described above, and A second slurry is formed on one surface side of the strip 1 along the traveling direction of the strip 1 on the downstream side of the pre-rough coating roll nozzle 13a as the slurry discharge means and the upstream of the pair of coating rolls 12c. It has a pre-application roll nozzle 13b as a discharge means. Also in the slurry coating device 32, the belt-shaped body 1 is provided with a belt-shaped body transporting roll (not shown), the rough coating roll 12a and the coating roll 12c, and, if necessary, the backup roll 12b. At the same time, it is configured to be able to swing relative to the pre-rough-coating roll nozzle 13a along the width direction of the strip 1 (the vertical direction in FIG. 12B). Such a belt-like body swinging means swings the belt-like body 1 relative to the coarse coating roll pre-nozzle 13 a and the coating roll pre-nozzle 13 b along the width direction of the strip 1, while the coarse coating roll pre-nozzle 13a and the nozzle 13b before the application roll discharge and supply the annealing separator slurry 4 to both surfaces or one surface of the strip 1 that travels with this swing. Thereby, the pre-rough application roll nozzle 13a and the pre-application roll nozzle 13b change the relative positional relationship between the discharge port and the belt 1 along the width direction of the belt 1 over time, An annealing separator slurry 4 can be supplied to the body 1. Here, as in the case of the second modification of the first embodiment, either the pre-rough application roll nozzle 13a or the pre-application roll nozzle 13b is swung integrally with the squeeze roll, that is, the rough application roll. Only one of the front nozzle 13a and the application roll front nozzle 13b may swing relative to the band 1.
（実施の形態２の第３の変形例）
　また、図１２Ｃに示すように、本実施の形態２の第３の変形例に係るスラリー塗布装置３３は、上述した第１の変形例によるスラリー塗布装置３１と同様の構成を有し、さらに、帯状体１の走行方向に沿って、一対の塗布ロール１２ｃの下流側において、帯状体１の他方の面側に、第２のスラリー吐出手段としての塗布ロール後ノズル１３ｃを有する。そして、このスラリー塗布装置３３においても、帯状体搬送ロール（図示せず）、粗塗布ロール１２ａおよび塗布ロール１２ｃと、必要に応じてバックアップロール１２ｂとが、帯状体揺動手段として、帯状体１とともに、帯状体１の幅方向（図１２Ｃ中、紙面垂直方向）に沿って、粗塗布ロール前ノズル１３ａに対し相対的に揺動可能に構成されている。このような帯状体揺動手段が、帯状体１の幅方向に沿って粗塗布ロール前ノズル１３ａおよび塗布ロール後ノズル１３ｃに対し相対的に帯状体１を揺動しつつ、粗塗布ロール前ノズル１３ａおよび塗布ロール後ノズル１３ｃが、この揺動とともに走行する帯状体１の両表面または一方の面に焼鈍分離剤スラリー４を吐出供給する。これにより、粗塗布ロール前ノズル１３ａおよび塗布ロール後ノズル１３ｃは、自身の吐出口と帯状体１との相対的な位置関係を帯状体１の幅方向に沿って経時的に変化させながら、帯状体１に対して焼鈍分離剤スラリー４を供給することができる。ここで、実施の形態１の第２の変形例の場合と同様、粗塗布ロール前ノズル１３ａまたは塗布ロール後ノズル１３ｃのいずれか一方がスクイーズロールと一体的に揺動され、すなわち、粗塗布ロール前ノズル１３ａまたは塗布ロール後ノズル１３ｃのいずれか一方のみが帯状体１に対して相対的に揺動するようにしても良い。 (Third Modification of Embodiment 2)
Further, as shown in FIG. 12C, the slurry application device 33 according to the third modification of the second embodiment has the same configuration as the slurry application device 31 according to the first modification described above, and A post-application-roll nozzle 13c as a second slurry discharge means is provided on the other surface side of the band-like body 1 on the downstream side of the pair of application rolls 12c along the traveling direction of the band-like body 1. Also in this slurry coating device 33, the belt-shaped body 1 is a strip-shaped body conveying roll (not shown), the rough coating roll 12a and the coating roll 12c, and, if necessary, the backup roll 12b as the belt-shaped body rocking means. At the same time, it is configured to be able to swing relative to the pre-rough coating roll nozzle 13a along the width direction of the strip 1 (the vertical direction in FIG. 12C). Such a belt-like body swinging means swings the belt-like body 1 relative to the coarse coating roll pre-nozzle 13a and the post-coating roll post-nozzle 13c along the width direction of the belt-like body 1, while the coarse coating roll pre-nozzle nozzle. 13a and the nozzle 13c after an application roll discharge and supply the annealing separation agent slurry 4 to both surfaces or one surface of the strip 1 that travels with this swing. Thereby, the nozzle 13a before the rough application roll and the nozzle 13c after the application roll change the relative positional relationship between the discharge port and the band 1 along the width direction of the band 1 with time, and change the band shape. An annealing separator slurry 4 can be supplied to the body 1. Here, as in the case of the second modification of the first embodiment, either the pre-coating roll nozzle 13a or the post-coating roll nozzle 13c is swung integrally with the squeeze roll, that is, the rough coating roll. Only one of the front nozzle 13a and the post-application roll nozzle 13c may swing relative to the band 1.
　次に、上述した本発明の実施の形態２の第２の変形例に基づいた実施例と、従来技術に基づいた比較例とについて説明する。なお、本発明はこれらの実施例に限定されるものではない。 Next, an example based on the above-described second modification of the second embodiment of the present invention and a comparative example based on the prior art will be described. The present invention is not limited to these examples.
（実施例３７～５１および比較例３）
　実施例３７～５１および比較例３においては、まず、帯状体１として、ケイ素（Ｓｉ）を３．４重量％含有する最終板厚０．３ｍｍの方向性電磁鋼板の冷延板を用いた。そして、この帯状体１に対して脱炭焼鈍を行った後、上述した実施の形態２の第２の変形例によるスラリー塗布装置３２を用いて帯状体１に焼鈍分離剤スラリー４を塗布した。具体的には、粗塗布ロール前ノズル１３ａおよび塗布ロール前ノズル１３ｂによって、片面あたりの焼鈍分離剤スラリー４の塗布量をそれぞれ７．０ｇ／ｍ2の目付量として、帯状体１の両面に酸化マグネシウム（ＭｇＯ）を塗布する。続いて、帯状体１を巻き取ってコイル１０とした後、このコイル１０に対して１２００℃の温度条件で仕上げ焼鈍を行う。仕上げ焼鈍後、フラットニング焼鈍炉において、温度を８５０℃とした条件下において帯状体１の形状矯正を行う。そして、形状矯正がされた帯状体１に対して、長手方向に沿った形状不良の有無を目視によって検査した。 (Examples 37 to 51 and Comparative Example 3)
In Examples 37 to 51 and Comparative Example 3, first, a cold-rolled sheet of grain-oriented electrical steel sheet having a final sheet thickness of 0.3 mm containing 3.4% by weight of silicon (Si) was used as the strip 1. And after performing decarburization annealing with respect to this strip | belt body 1, the annealing separation agent slurry 4 was apply | coated to the strip | belt body 1 using the slurry application apparatus 32 by the 2nd modification of Embodiment 2 mentioned above. Specifically, the coating amount of the annealing separator slurry 4 per one surface is oxidized on both surfaces of the strip 1 by setting the coating amount of the annealing separator slurry 4 per one side to 7.0 g / m 2 by the nozzle 13a before the rough coating roll and the nozzle 13b before the coating roll. Apply magnesium (MgO). Then, after winding the strip | belt-shaped body 1 into the coil 10, finish annealing is performed with respect to this coil 10 on 1200 degreeC temperature conditions. After the finish annealing, the shape of the belt-like body 1 is corrected in a flattening annealing furnace at a temperature of 850 ° C. And the presence or absence of the shape defect along a longitudinal direction was test | inspected visually with respect to the strip | belt-shaped body 1 by which shape correction was carried out.
　これらの実施例３７～５１において、焼鈍分離剤スラリー４を帯状体１の表面に塗布する際の帯状体１の揺動の制御は、次のように行う。 In these Examples 37 to 51, the swing control of the strip 1 when the annealing separator slurry 4 is applied to the surface of the strip 1 is performed as follows.
　すなわち、実施例３７～４１においては、図９Ａに示すピッチＴをそれぞれ、１秒、２秒、６０秒、１２０秒、および１５０秒として、帯状体１に対して正弦波状に揺動制御を行う。実施例４２～４６においては、図９Ｂに示すピッチＴをそれぞれ、１秒、２秒、６０秒、１２０秒、および１５０秒として、帯状体１に対して三角形波状に揺動制御を行う。実施例４７～５１においては、図９Ｃに示すピッチＴをそれぞれ、１秒、２秒、６０秒、１２０秒、および１５０秒として、帯状体１に対して矩形波状に揺動制御を行う。また、比較例３においては、従来と同様に、帯状体１を揺動させることなく、焼鈍分離剤スラリー４を帯状体１の表面に塗布する。表３は、以上の実施例３７～５１および比較例３の結果を示す表である。 That is, in Examples 37 to 41, the pitch T shown in FIG. 9A is set to 1 second, 2 seconds, 60 seconds, 120 seconds, and 150 seconds, respectively, and swing control is performed on the strip 1 in a sinusoidal shape. . In Examples 42 to 46, the pitch T shown in FIG. 9B is set to 1 second, 2 seconds, 60 seconds, 120 seconds, and 150 seconds, respectively, and swing control is performed on the strip 1 in a triangular wave shape. In Examples 47 to 51, the belt T is controlled to be swung in a rectangular wave shape with the pitch T shown in FIG. 9C set to 1 second, 2 seconds, 60 seconds, 120 seconds, and 150 seconds, respectively. Further, in Comparative Example 3, the annealing separator slurry 4 is applied to the surface of the band 1 without causing the band 1 to swing as in the conventional example. Table 3 is a table showing the results of Examples 37 to 51 and Comparative Example 3 described above.
Figure JPOXMLDOC01-appb-T000003
Figure JPOXMLDOC01-appb-T000003
　表３から、実施例３７～５１においては、帯状体１である方向性電磁鋼板の形状不良の発生が全く無いか、従来に比して軽減されていることがわかる。これに対し、比較例３においては、形状不良が発生していることがわかる。これらの実施例３７～５１と比較例３との比較から、実施例３７～５１のように、帯状体揺動手段としての帯状体搬送ロール１５およびスクイーズロール１２をスラリー吐出手段に対し相対的に揺動させて、帯状体１に対して、帯状体１の幅方向に沿った揺動制御を行うことにより、方向性電磁鋼板における形状不良の発生を抑制できることがわかる。 From Table 3, it can be seen that in Examples 37 to 51, there is no occurrence of the shape failure of the grain-oriented electrical steel sheet, which is the belt-like body 1, or it is reduced as compared with the prior art. On the other hand, in Comparative Example 3, it can be seen that a shape defect has occurred. From comparison between Examples 37 to 51 and Comparative Example 3, as in Examples 37 to 51, the belt-like body transporting roll 15 and the squeeze roll 12 as the belt-like rocking means are relatively disposed with respect to the slurry discharging means. It can be seen that the occurrence of shape defects in the grain-oriented electrical steel sheet can be suppressed by swinging and performing swing control along the width direction of the strip 1 on the strip 1.
　また、表３において、形状不良が軽減された実施例と形状不良がない実施例とを比較すると、ピッチＴを２～１２０秒として帯状体１を揺動させつつ焼鈍分離剤スラリー４を塗布することによって、方向性電磁鋼板において形状不良が発生しなくなることがわかる。したがって、帯状体１に対する揺動制御におけるピッチＴは、２～１２０秒とするのが好ましいことがわかる。 Also, in Table 3, when comparing the example in which the shape defect was reduced and the example in which there was no shape defect, the annealing separator slurry 4 was applied with the pitch T set to 2 to 120 seconds while the strip 1 was swung. Thus, it can be seen that shape defects do not occur in the grain-oriented electrical steel sheet. Therefore, it can be seen that the pitch T in the swing control for the band 1 is preferably 2 to 120 seconds.
（実施例５２～５７および比較例４）
　実施例５２～５７および比較例４においては、まず、帯状体１として、ケイ素（Ｓｉ）を３．４重量％含有する最終板厚０．２３ｍｍの方向性電磁鋼板の冷延板を用いる。そして、この帯状体１に対して脱炭焼鈍を行った後、上述した実施の形態２の第２の変形例によるスラリー塗布装置３２を用いて帯状体１に焼鈍分離剤スラリー４を塗布した。具体的には、粗塗布ロール前ノズル１３ａおよび塗布ロール前ノズル１３ｂによって、片面あたりの焼鈍分離剤スラリー４の塗布量をそれぞれ７．０ｇ／ｍ2の目付量として、帯状体１の両面に酸化マグネシウム（ＭｇＯ）を塗布する。続いて、帯状体１を巻き取ってコイル１０とした後、このコイル１０に対して１２００℃の温度条件で仕上げ焼鈍を行う。仕上げ焼鈍後、フラットニング焼鈍炉において、温度を８５０℃とした条件下において帯状体１の形状矯正を行う。そして、形状矯正がされた帯状体１に対して、長手方向に沿った形状不良の有無を目視によって検査した。 (Examples 52 to 57 and Comparative Example 4)
In Examples 52 to 57 and Comparative Example 4, first, a cold-rolled sheet of grain-oriented electrical steel sheet having a final sheet thickness of 0.23 mm containing 3.4% by weight of silicon (Si) is used as the strip 1. And after performing decarburization annealing with respect to this strip | belt body 1, the annealing separation agent slurry 4 was apply | coated to the strip | belt body 1 using the slurry application apparatus 32 by the 2nd modification of Embodiment 2 mentioned above. Specifically, the coating amount of the annealing separator slurry 4 per one surface is oxidized on both surfaces of the strip 1 by setting the coating amount of the annealing separator slurry 4 per one side to 7.0 g / m 2 by the nozzle 13a before the rough coating roll and the nozzle 13b before the coating roll. Apply magnesium (MgO). Then, after winding the strip | belt-shaped body 1 into the coil 10, finish annealing is performed with respect to this coil 10 on 1200 degreeC temperature conditions. After the finish annealing, the shape of the belt-like body 1 is corrected in a flattening annealing furnace at a temperature of 850 ° C. And the presence or absence of the shape defect along a longitudinal direction was test | inspected visually with respect to the strip | belt-shaped body 1 by which shape correction was carried out.
　これらの実施例５２～５７において、焼鈍分離剤スラリー４を帯状体１の表面に塗布する際に、帯状体１は、以下のような技術思想に基づいて揺動させた。 In these Examples 52 to 57, when the annealing separator slurry 4 was applied to the surface of the strip 1, the strip 1 was swung based on the following technical idea.
　本発明における帯状体揺動手段によって帯状体１をその鋼板幅方向へ揺動させることによる効果は、塗布ノズルの配置に起因する焼鈍分離剤スラリー４の塗布量の微小な変動を帯状体１の鋼板幅方向に分散させることにより、この帯状体１上における焼鈍分離剤スラリー４の塗布量の均一化を促進することである。さらに、この帯状体１は、焼鈍分離剤スラリー４を塗布後に巻き取られてコイルとなるため、このコイルの径方向に隣り合うもしくは隣接する焼鈍分離剤スラリー４の鋼板上における塗布量の組み合わせを一定にすることが一層望ましいと考えられる。 The effect of swinging the strip 1 in the width direction of the steel plate by the strip swinging means in the present invention is that a minute variation in the coating amount of the annealing separator slurry 4 due to the arrangement of the coating nozzle is caused by the strip 1. By dispersing in the width direction of the steel sheet, it is to promote the uniform application amount of the annealing separator slurry 4 on the strip 1. Furthermore, since this strip | belt-shaped body 1 is wound up after application | coating annealing separator slurry 4 and becomes a coil, the combination of the coating amount on the steel plate of the annealing separator slurry 4 which adjoins or adjoins to the radial direction of this coil is combined. It is considered more desirable to keep it constant.
　このような考え方に基づけば、帯状体１を巻き取ってなるコイルのターンピッチを考慮したうえで、この帯状体１の揺動周期を変動させることが望ましいと想起される。本実施例では、帯状体１を、１ターンピッチ毎に１周期、揺動させるのではなく、２ターンピッチ毎に１周期、揺動させる。これにより、コイル状態の鋼板の層間における焼鈍分離剤スラリー４の塗布量の合計が鋼板幅方向について一層均質化できる可能性があることを、本発明者等は見出した。 Based on such a concept, it is recalled that it is desirable to change the oscillation period of the strip 1 in consideration of the turn pitch of the coil wound around the strip 1. In the present embodiment, the belt-like body 1 is not swung for one cycle every one turn pitch, but is swung for one cycle every two turn pitches. As a result, the present inventors have found that there is a possibility that the total amount of the annealing separator slurry 4 applied between the layers of the coiled steel sheet may be further homogenized in the width direction of the steel sheet.
　そこで、実施例５２～５７においては、帯状体１のラインスピードＶとコイル１０のターンピッチＬの２倍との比（Ｖ／２Ｌ）をターンピッチ周波数（単位は［Ｈｚ］）として定義し、ターンピッチ周波数が０．６６５ＨｚとなるようにラインスピードＶおよびコイル１０のコイル径を設定した。このとき、帯状体１の揺動周波数を０．０１０Ｈｚ～１．０００Ｈｚの範囲内で変更して、帯状体１の表面に焼鈍分離剤スラリー４を塗布した。また、帯状体１の揺動量の時間変化は、正弦波状に制御した。一方、比較例４においては、従来と同様に、帯状体１を揺動させることなく、焼鈍分離剤スラリー４を帯状体１の表面に塗布した。以上の実施例５２～５７および比較例４の各々における帯状体１の形状不良の検査結果を表４に示す。 Therefore, in Examples 52 to 57, the ratio (V / 2L) of the line speed V of the strip 1 to twice the turn pitch L of the coil 10 is defined as the turn pitch frequency (unit: [Hz]). The line speed V and the coil diameter of the coil 10 were set so that the turn pitch frequency was 0.665 Hz. At this time, the swinging frequency of the strip 1 was changed within the range of 0.010 Hz to 1.000 Hz, and the annealing separator slurry 4 was applied to the surface of the strip 1. Moreover, the time change of the rocking | fluctuation amount of the strip | belt-shaped body 1 was controlled to the sine wave shape. On the other hand, in Comparative Example 4, the annealing separator slurry 4 was applied to the surface of the strip 1 without swinging the strip 1 as in the prior art. Table 4 shows the inspection results of the shape defects of the band 1 in each of the above Examples 52 to 57 and Comparative Example 4.
Figure JPOXMLDOC01-appb-T000004
Figure JPOXMLDOC01-appb-T000004
　表４から、実施例５２～５７において、帯状体１（方向性電磁鋼板）の形状不良の発生が全く無い、あるいは、従来に比して軽減されていることがわかる。さらに、実施例５２～５４において、帯状体１の揺動周波数が、ターンピッチ周波数に近づく条件、すなわち、０．６６５Ｈｚと同値またはその近傍である場合、帯状体１の形状不良が発生しなくなることがわかる。これに対し、比較例４においては、帯状体１の形状不良が発生していることがわかる。 From Table 4, it can be seen that in Examples 52 to 57, the strip 1 (orientated electrical steel sheet) does not have any shape defects or is reduced as compared with the prior art. Further, in Examples 52 to 54, when the oscillation frequency of the strip 1 is close to the turn pitch frequency, that is, the same value as or close to 0.665 Hz, the shape defect of the strip 1 does not occur. I understand. On the other hand, in Comparative Example 4, it can be seen that the shape defect of the belt-like body 1 occurs.
　なお、実施例５２～５７において、帯状体１の揺動量の時間変化は、正弦波状に制御していたが、この揺動量の時間変化を矩形波状または三角形波状に制御した場合であっても、帯状体１の形状不良の検査結果に違いは見られなかった。 In Examples 52 to 57, the time change of the swing amount of the belt-like body 1 was controlled in a sine wave shape, but even when this time change of the swing amount is controlled in a rectangular wave shape or a triangular wave shape, There was no difference in the inspection result of the shape defect of the band 1.
　また、実施例５２～５７では、ターンピッチ周波数が０．６６５Ｈｚである場合の結果を示したが、ターンピッチ周波数が０．６６５Ｈｚ以外の値であっても、帯状体１の揺動周波数をターンピッチ周波数に近づけることにより、ターンピッチ周波数が０．６６５Ｈｚである場合と同様の結果が得られた。 Further, in Examples 52 to 57, the result in the case where the turn pitch frequency is 0.665 Hz is shown. However, even if the turn pitch frequency is a value other than 0.665 Hz, the oscillation frequency of the strip 1 is turned. By approaching the pitch frequency, the same result as that obtained when the turn pitch frequency was 0.665 Hz was obtained.
　さらに、実施例５２～５７では、上述したようにターンピッチの２倍をもとにターンピッチ周波数を設定し、このターンピッチ周波数に基づいて帯状体１の揺動を制御した。これにより、表４に示すような良好な結果を得たが、このような考え方を敷衍した塗布条件、すなわち、ターンピッチの偶数倍をもとにターンピッチ周波数を設定し、このように設定したターンピッチ周波数に合わせて帯状体１を揺動させた場合も同様に効果があった。 Further, in Examples 52 to 57, the turn pitch frequency was set based on twice the turn pitch as described above, and the oscillation of the strip 1 was controlled based on this turn pitch frequency. As a result, good results as shown in Table 4 were obtained, but the turn pitch frequency was set based on the coating conditions based on such a concept, that is, an even multiple of the turn pitch. The same effect was obtained when the strip 1 was swung in accordance with the turn pitch frequency.
　以上説明した本発明の実施の形態２によれば、焼鈍分離剤スラリー４を帯状体１の表面に塗布する際に、帯状体搬送ロール１５およびスクイーズロール１２によって帯状体１をその幅方向に沿って揺動させることにより、この幅方向に沿った焼鈍分離剤スラリー４の膜厚分布の不均一性をなだらかにしたり、帯状体１を巻き取ってコイル１０とした場合にビルドアップを防止したりすることができる。このため、鋼板の製造において平坦化焼鈍後に生じやすい、鋼板の長手方向に沿った皺状の形状不良の発生、すなわち、上述した帯状体１における形状不良の発生を抑制することが可能となる。この結果、鋼板の製造における歩留まりを向上することができる。 According to the second embodiment of the present invention described above, when the annealing separator slurry 4 is applied to the surface of the strip 1, the strip 1 is moved along the width direction by the strip transport roll 15 and the squeeze roll 12. To make the unevenness of the film thickness distribution of the annealing separator slurry 4 along the width direction smooth, or to prevent build-up when the strip 1 is wound up to form the coil 10. can do. For this reason, it becomes possible to suppress generation | occurrence | production of the saddle-like shape defect along the longitudinal direction of a steel plate which is easy to occur after planarization annealing in manufacture of a steel plate, ie, generation | occurrence | production of the shape defect in the strip | belt-shaped body 1 mentioned above. As a result, the yield in the manufacture of the steel sheet can be improved.
　以上、本発明の実施の形態１、２について具体的に説明したが、本発明は、上述の実施の形態１、２に限定されるものではなく、本発明の技術的思想に基づく各種の変形が可能である。例えば、上述の実施の形態１、２において挙げた数値はあくまでも例に過ぎず、必要に応じてこれと異なる数値を用いてもよい。 Although the first and second embodiments of the present invention have been specifically described above, the present invention is not limited to the above-described first and second embodiments, and various modifications based on the technical idea of the present invention. Is possible. For example, the numerical values given in the first and second embodiments are merely examples, and different numerical values may be used as necessary.
　また、上述した実施の形態１においては、スラリー供給ノズル３を正弦波状や矩形波状に制御する場合のピッチＴを２～１２０秒としたり、コイル１０のターンピッチに合わせて塗布ノズルの揺動周波数を所定の値（例えば０．６６５Ｈｚ等）としているが、帯状体１のラインスピードやコイル１０の巻き取り後の位置に対応して周期や周波数を可変としてもよい。 Further, in the first embodiment described above, the pitch T when the slurry supply nozzle 3 is controlled to be sinusoidal or rectangular wave is set to 2 to 120 seconds, or the oscillation frequency of the coating nozzle is adjusted in accordance with the turn pitch of the coil 10. Is a predetermined value (for example, 0.665 Hz), but the period and frequency may be variable corresponding to the line speed of the strip 1 and the position after winding of the coil 10.
　さらに、上述した実施の形態２においては、帯状体搬送ロール１５を用いて帯状体１を揺動させているが、この帯状体搬送ロール１５を用いずに、スラリー塗布装置としての焼鈍分離剤塗布装置の入出側に設けられるピンチロールやブライドルロールを用いて、帯状体１を揺動させることも可能である。 Furthermore, in Embodiment 2 mentioned above, although the strip | belt-shaped body 1 is rock | fluctuated using the strip | belt-shaped body conveyance roll 15, without using this strip | belt-shaped body conveyance roll 15, annealing separator application | coating as a slurry application | coating apparatus is carried out. It is also possible to rock the strip 1 using a pinch roll or a bridle roll provided on the entry / exit side of the apparatus.
　また、上述した実施の形態２においては、帯状体１に対して、正弦波状、三角形波状、または矩形波状に揺動制御を行う場合のピッチＴを２～１２０秒としたり、コイル１０のターンピッチに合わせて帯状体１の揺動周波数を所定の値（例えば０．６６５Ｈｚ等）としているが、帯状体１のラインスピードやコイル１０の巻き取り後の位置に対応して周期や周波数を種々の値に可変とすることも可能である。 In the second embodiment described above, the pitch T in the case where the swing control is performed on the strip 1 in a sine wave shape, a triangular wave shape, or a rectangular wave shape is set to 2 to 120 seconds, or the turn pitch of the coil 10 is set. The oscillation frequency of the strip 1 is set to a predetermined value (for example, 0.665 Hz), but the period and frequency are varied according to the line speed of the strip 1 and the position after winding of the coil 10. It is also possible to make the value variable.
　また、上述した実施の形態２においては、スラリー供給ノズル１３を固定した例について説明しているが、帯状体１に対する揺動制御との間で調整しつつ、スラリー供給ノズル１３も併せて揺動させてもよい。 In the second embodiment described above, an example in which the slurry supply nozzle 13 is fixed has been described. However, the slurry supply nozzle 13 is also swung together while being adjusted with respect to the swing control for the strip 1. You may let them.
　以上のように、本発明に係るスラリー塗布装置およびスラリー塗布方法は、鋼板表面に対する焼鈍分離剤などのスラリーの塗布に有用であり、特に、鋼板の形状不良を抑制して鋼板製造の歩留まりを向上することに適している。 As described above, the slurry coating apparatus and the slurry coating method according to the present invention are useful for coating a slurry such as an annealing separator on the surface of a steel sheet, and particularly improve the yield of steel sheet production by suppressing the shape failure of the steel sheet. Suitable for doing.
　１　帯状体
　２，１２　スクイーズロール
　２ａ，１２ａ　粗塗布ロール
　２ｂ，１２ｂ　バックアップロール
　２ｃ，１２ｃ　塗布ロール
　３，１３　スラリー供給ノズル
　３ａ，１３ａ　粗塗布ロール前ノズル
　３ｂ，１３ｂ　塗布ロール前ノズル
　３ｃ，１３ｃ　塗布ロール後ノズル
　４　焼鈍分離剤スラリー
　１０　コイル
　１５　帯状体搬送ロール
　２０，２１，２２，２３，３０，３１，３２，３３，１００　スラリー塗布装置 DESCRIPTION OF SYMBOLS 1 Strip | belt-shaped body 2,12 Squeeze roll 2a, 12a Coarse application roll 2b, 12b Backup roll 2c, 12c Application roll 3,13 Slurry supply nozzle 3a, 13a Pre-coating roll nozzle 3b, 13b Pre-application roll nozzle 3c, 13c Application roll Rear nozzle 4 Annealing / separating agent slurry 10 Coil 15 Strip body transport roll 20, 21, 22, 23, 30, 31, 32, 33, 100 Slurry coating device

Claims (29)

  1. 　走行する帯状体に対してスラリーを塗布するスラリー塗布装置において、
    　前記帯状体に前記スラリーを供給可能に構成されたスラリー吐出手段を備え、
    　前記帯状体の面に概ね平行で且つ前記帯状体の走行方向に対して概ね直角な方向に、前記スラリー吐出手段と前記帯状体との相対的な位置関係を変化させつつ、前記スラリー吐出手段によって前記帯状体に前記スラリーを供給することを特徴とするスラリー塗布装置。     In a slurry application device that applies slurry to a traveling belt-like body,
    A slurry discharge means configured to be able to supply the slurry to the strip,
    The slurry discharge means changes the relative positional relationship between the slurry discharge means and the band in a direction substantially parallel to the surface of the band and substantially perpendicular to the traveling direction of the band. A slurry coating apparatus, wherein the slurry is supplied to the belt-like body.
  2. 　前記帯状体を把持しつつ押圧して、供給された前記スラリーを前記帯状体の表面に塗布可能に構成された一対の塗布手段を備え、
    　前記スラリー吐出手段が、前記帯状体の面に概ね平行で且つ前記帯状体の走行方向に対して概ね直角な方向に、前記帯状体に対し相対的に揺動可能に構成されることを特徴とする請求項１に記載のスラリー塗布装置。     It comprises a pair of application means configured to be able to apply the slurry supplied to the surface of the band-like body by pressing while holding the band-like body,
    The slurry discharge means is configured to be able to swing relative to the strip in a direction substantially parallel to the surface of the strip and substantially perpendicular to the traveling direction of the strip. The slurry coating apparatus according to claim 1.
  3. 　前記スラリー吐出手段が、前記一対の塗布手段に対して前記帯状体の走行方向に沿った上流側に設けられているとともに、前記一対の塗布手段に対して前記帯状体の走行方向に沿った下流側に、前記帯状体に前記スラリーを供給可能に構成された第２のスラリー吐出手段が設けられていることを特徴とする請求項２に記載のスラリー塗布装置。 The slurry discharge means is provided upstream of the pair of application means along the traveling direction of the strip, and downstream of the pair of application means along the travel direction of the strip. The slurry coating apparatus according to claim 2, wherein a second slurry discharge means configured to be able to supply the slurry to the belt-like body is provided on the side.
  4. 　前記第２のスラリー吐出手段が、前記帯状体の面に概ね平行で且つ前記帯状体の走行方向に対して概ね直角な方向に、前記帯状体に対し相対的に揺動可能に構成されていることを特徴とする請求項３に記載のスラリー塗布装置。 The second slurry discharge means is configured to be able to swing relative to the strip in a direction substantially parallel to the surface of the strip and substantially perpendicular to the traveling direction of the strip. The slurry coating apparatus according to claim 3.
  5. 　前記スラリー吐出手段が、前記一対の塗布手段に対して前記帯状体の走行方向に沿った下流側に設けられているとともに、前記一対の塗布手段に対して前記帯状体の走行方向に沿った上流側に、前記帯状体に前記スラリーを供給可能に構成された第３のスラリー吐出手段が設けられていることを特徴とする請求項２に記載のスラリー塗布装置。 The slurry discharge means is provided on the downstream side along the traveling direction of the band-shaped body with respect to the pair of application means, and upstream along the traveling direction of the band-shaped body with respect to the pair of application means. 3. The slurry applying apparatus according to claim 2, further comprising a third slurry discharge unit configured to be able to supply the slurry to the belt-like body.
  6. 　前記揺動における揺動量の時間変化が、矩形波状、正弦波状、または三角形波状であることを特徴とする請求項２～５のいずれか１項に記載のスラリー塗布装置。 The slurry coating apparatus according to any one of claims 2 to 5, wherein the temporal change of the swing amount in the swing is a rectangular wave shape, a sine wave shape, or a triangular wave shape.
  7. 　前記スラリー吐出手段を保持する当該スラリー塗布装置ごと、前記帯状体に対し相対的に揺動可能に構成されていることを特徴とする請求項２～６のいずれか１項に記載のスラリー塗布装置。 The slurry coating apparatus according to any one of claims 2 to 6, wherein each of the slurry coating apparatuses that hold the slurry discharge means is configured to be able to swing relative to the belt-like body. .
  8. 　前記スラリー吐出手段の揺動周波数が、前記帯状体を巻き取ってなるコイルのターンピッチをもとに設定されることを特徴とする請求項２～７のいずれか１項に記載のスラリー塗布装置。 The slurry applying apparatus according to any one of claims 2 to 7, wherein the oscillation frequency of the slurry discharge means is set based on a turn pitch of a coil formed by winding the belt-like body. .
  9. 　前記スラリー吐出手段の揺動周波数が、前記ターンピッチの偶数倍をもとに設定されることを特徴とする請求項８に記載のスラリー塗布装置。 The slurry coating apparatus according to claim 8, wherein the oscillation frequency of the slurry discharge means is set based on an even multiple of the turn pitch.
  10. 　前記帯状体の面に概ね平行で且つ前記帯状体の走行方向に対して概ね直角な方向に、前記帯状体を前記スラリー吐出手段に対し相対的に揺動可能に構成された帯状体揺動手段と、
    　前記帯状体を把持しつつ押圧して、供給された前記スラリーを前記帯状体の表面に塗布可能に構成された一対の塗布手段と、
    　を備えることを特徴とする請求項１に記載のスラリー塗布装置。     A belt-like body swinging means configured to swing the belt-like body relative to the slurry discharge means in a direction substantially parallel to the surface of the belt-like body and substantially perpendicular to the traveling direction of the belt-like body. When,
    A pair of application means configured to be able to apply the slurry supplied to the surface of the band-shaped body by pressing the band-shaped body while pressing the band-shaped body;
    The slurry coating apparatus according to claim 1, further comprising:
  11. 　前記一対の塗布手段に対して前記帯状体の走行方向に沿った下流側に、前記帯状体を把持しつつ押圧して、前記スラリーを前記帯状体の表面に塗布可能に構成された第２の一対の塗布手段が設けられていることを特徴とする請求項１０に記載のスラリー塗布装置。 A second structure configured to be able to apply the slurry to the surface of the band-like body by pressing the belt-like body while holding the band-like body downstream of the pair of application means along the traveling direction of the band-like body. The slurry coating apparatus according to claim 10, wherein a pair of coating means is provided.
  12. 　前記一対の塗布手段に対して前記帯状体の走行方向に沿った下流側に、前記帯状体に前記スラリーを供給可能に構成された第２のスラリー吐出手段が設けられていることを特徴とする請求項１０または１１に記載のスラリー塗布装置。 A second slurry discharge means configured to be able to supply the slurry to the band-like body is provided downstream of the pair of application means along the traveling direction of the band-like body. The slurry coating apparatus according to claim 10 or 11.
  13. 　前記帯状体の揺動量の時間変化が、矩形波状、正弦波状、または三角形波状であることを特徴とする請求項１０～１２のいずれか１項に記載のスラリー塗布装置。 The slurry coating apparatus according to any one of claims 10 to 12, wherein the temporal change in the amount of oscillation of the belt-like body is a rectangular wave shape, a sine wave shape, or a triangular wave shape.
  14. 　前記帯状体の揺動周波数が、前記帯状体を巻き取ってなるコイルのターンピッチをもとに設定されることを特徴とする請求項１０～１３のいずれか１項に記載のスラリー塗布装置。 The slurry coating apparatus according to any one of claims 10 to 13, wherein the oscillation frequency of the strip is set based on a turn pitch of a coil formed by winding the strip.
  15. 　前記帯状体の揺動周波数が、前記ターンピッチの偶数倍をもとに設定されることを特徴とする請求項１４に記載のスラリー塗布装置。 The slurry coating apparatus according to claim 14, wherein the oscillation frequency of the strip is set based on an even multiple of the turn pitch.
  16. 　走行する帯状体に対してスラリーを塗布するスラリー塗布方法において、
    　前記帯状体の面に概ね平行で且つ前記帯状体の走行方向に対して概ね直角な方向に前記スラリーの吐出口と前記帯状体との相対的な位置関係を変化させつつ、前記帯状体に前記スラリーを供給することを特徴とするスラリー塗布方法。     In a slurry application method for applying a slurry to a traveling strip,
    While changing the relative positional relationship between the discharge port of the slurry and the band in a direction substantially parallel to the surface of the band and substantially perpendicular to the traveling direction of the band, the band A slurry application method comprising supplying a slurry.
  17. 　前記帯状体の面に概ね平行で且つ前記帯状体の走行方向に対して概ね直角な方向に前記吐出口を前記帯状体に対し相対的に揺動しつつ、前記帯状体に前記スラリーを供給するスラリー供給ステップと、
    　前記スラリーが供給された前記帯状体を把持しつつ押圧して前記スラリーを前記帯状体の表面に塗布するスラリー塗布ステップと、
    　を含むことを特徴とする請求項１６に記載のスラリー塗布方法。     The slurry is supplied to the belt while swinging the discharge port relative to the belt in a direction substantially parallel to the surface of the belt and substantially perpendicular to the traveling direction of the belt. A slurry supply step;
    A slurry application step of applying the slurry to the surface of the band by pressing while holding the band supplied with the slurry;
    The slurry coating method according to claim 16, comprising:
  18. 　前記スラリー塗布ステップ後に、前記帯状体に対して前記スラリーを供給する第２のスラリー供給ステップを含むことを特徴とする請求項１７に記載のスラリー塗布方法。 The slurry application method according to claim 17, further comprising a second slurry supply step for supplying the slurry to the strip after the slurry application step.
  19. 　前記第２のスラリー供給ステップにおいて、前記帯状体の面に概ね平行で且つ前記帯状体の走行方向に対して概ね直角な方向に前記スラリーの吐出口を前記帯状体に対し相対的に揺動しつつ、前記帯状体に前記スラリーを供給することを特徴とする請求項１８に記載のスラリー塗布方法。 In the second slurry supply step, the slurry discharge port is swung relative to the strip in a direction substantially parallel to the surface of the strip and substantially perpendicular to the traveling direction of the strip. The slurry application method according to claim 18, wherein the slurry is supplied to the strip.
  20. 　前記スラリー供給ステップの前に、前記帯状体に前記スラリーを供給する第３のスラリー供給ステップと、前記第３のスラリー供給ステップにおいて前記スラリーが供給された前記帯状体を把持しつつ押圧して前記スラリーを前記帯状体の表面に塗布する第２のスラリー塗布ステップと、をさらに含むことを特徴とする請求項１７に記載のスラリー塗布方法。 Prior to the slurry supplying step, a third slurry supplying step for supplying the slurry to the belt-like body, and a pressing operation while holding the belt-like body to which the slurry is supplied in the third slurry supplying step. The slurry application method according to claim 17, further comprising a second slurry application step of applying a slurry to the surface of the belt-like body.
  21. 　前記揺動における揺動量の時間変化を、矩形波状、正弦波状、または三角形波状とすることを特徴とする請求項１７～２０のいずれか１項に記載のスラリー塗布方法。 The slurry application method according to any one of claims 17 to 20, wherein the temporal change of the swing amount in the swing is a rectangular wave shape, a sine wave shape, or a triangular wave shape.
  22. 　前記帯状体を巻き取ってなるコイルのターンピッチをもとに、前記揺動における揺動周波数を設定することを特徴とする請求項１７～２１のいずれか１項に記載のスラリー塗布方法。 The slurry application method according to any one of claims 17 to 21, wherein a swing frequency in the swing is set based on a turn pitch of a coil formed by winding the strip.
  23. 　前記ターンピッチの偶数倍をもとに、前記揺動における揺動周波数を設定することを特徴とする請求項２２に記載のスラリー塗布方法。 23. The slurry coating method according to claim 22, wherein a swing frequency in the swing is set based on an even multiple of the turn pitch.
  24. 　前記帯状体の面に概ね平行で且つ前記帯状体の走行方向に対して概ね直角な方向に前記帯状体を前記吐出口に対し相対的に揺動しつつ、前記帯状体に前記スラリーを供給するスラリー供給ステップと、
    　前記スラリーが供給された前記帯状体を把持しつつ押圧して前記スラリーを前記帯状体の表面に塗布するスラリー塗布ステップと、
    　を含むことを特徴とする請求項１６に記載のスラリー塗布方法。     The slurry is supplied to the belt-like body while swinging the belt-like body relatively to the discharge port in a direction substantially parallel to the surface of the belt-like body and substantially perpendicular to the traveling direction of the belt-like body. A slurry supply step;
    A slurry application step of applying the slurry to the surface of the band by pressing while holding the band supplied with the slurry;
    The slurry coating method according to claim 16, comprising:
  25. 　前記スラリー塗布ステップ後に、前記スラリーが供給された前記帯状体を把持しつつ押圧して前記スラリーを前記帯状体の表面に塗布する第２のスラリー塗布ステップをさらに含むことを特徴とする請求項２４に記載のスラリー塗布方法。 25. The method according to claim 24, further comprising a second slurry application step of applying the slurry to the surface of the band-like body by holding and pressing the band-like body supplied with the slurry after the slurry applying step. The slurry application | coating method of description.
  26. 　前記スラリー塗布ステップ後に、前記帯状体に前記スラリーを供給する第２のスラリー供給ステップを含むことを特徴とする請求項２４または２５に記載のスラリー塗布方法。 The slurry application method according to claim 24 or 25, further comprising a second slurry supply step for supplying the slurry to the strip after the slurry application step.
  27. 　前記帯状体の揺動量の時間変化を、矩形波状、正弦波状、または三角形波状とすることを特徴とする請求項２４～２６のいずれか１項に記載のスラリー塗布方法。 The slurry application method according to any one of claims 24 to 26, wherein the temporal change in the amount of oscillation of the belt-like body is a rectangular wave shape, a sine wave shape, or a triangular wave shape.
  28. 　前記帯状体を巻き取ってなるコイルのターンピッチをもとに、前記帯状体の揺動周波数を設定することを特徴とする請求項２４～２７のいずれか１項に記載のスラリー塗布方法。 The slurry application method according to any one of claims 24 to 27, wherein an oscillation frequency of the strip is set based on a turn pitch of a coil formed by winding the strip.
  29. 　前記ターンピッチの偶数倍をもとに、前記帯状体の揺動周波数を設定することを特徴とする請求項２８に記載のスラリー塗布方法。 29. The slurry coating method according to claim 28, wherein the oscillation frequency of the strip is set based on an even multiple of the turn pitch.
PCT/JP2013/063077 2012-05-09 2013-05-09 Slurry coating device and slurry coating method WO2013168777A1 (en)

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KR1020147030978A KR101716944B1 (en) 2012-05-09 2013-05-09 Slurry coating device and slurry coating method
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