WO2016199803A1 - 塗装又は印刷のための前処理方法 - Google Patents
塗装又は印刷のための前処理方法 Download PDFInfo
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- WO2016199803A1 WO2016199803A1 PCT/JP2016/067031 JP2016067031W WO2016199803A1 WO 2016199803 A1 WO2016199803 A1 WO 2016199803A1 JP 2016067031 W JP2016067031 W JP 2016067031W WO 2016199803 A1 WO2016199803 A1 WO 2016199803A1
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- treatment
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- flame treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0011—Pre-treatment or treatment during printing of the recording material, e.g. heating, irradiating
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- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/08—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by flames
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- 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
- B05C9/08—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 and performing an auxiliary operation
- B05C9/14—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 and performing an auxiliary operation the auxiliary operation involving heating or cooling
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- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
- B05D3/0218—Pretreatment, e.g. heating the substrate
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- 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
- B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
- B05D3/06—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by exposure to radiation
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- 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
- B05D7/14—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 to metal, e.g. car bodies
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- 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
- B05D7/14—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 to metal, e.g. car bodies
- B05D7/142—Auto-deposited coatings, i.e. autophoretic coatings
- B05D7/144—After-treatment of auto-deposited coatings
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0041—Digital printing on surfaces other than ordinary paper
- B41M5/0047—Digital printing on surfaces other than ordinary paper by ink-jet printing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/0041—Digital printing on surfaces other than ordinary paper
- B41M5/0058—Digital printing on surfaces other than ordinary paper on metals and oxidised metal surfaces
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/02—Printing inks
- C09D11/10—Printing inks based on artificial resins
- C09D11/101—Inks specially adapted for printing processes involving curing by wave energy or particle radiation, e.g. with UV-curing following the printing
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D11/00—Inks
- C09D11/30—Inkjet printing inks
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
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- 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
- B05D2202/00—Metallic substrate
- B05D2202/10—Metallic substrate based on Fe
- B05D2202/15—Stainless steel
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- 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
- B05D2202/00—Metallic substrate
- B05D2202/20—Metallic substrate based on light metals
- B05D2202/25—Metallic substrate based on light metals based on Al
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/50—Recording sheets characterised by the coating used to improve ink, dye or pigment receptivity, e.g. for ink-jet or thermal dye transfer recording
- B41M5/52—Macromolecular coatings
- B41M5/5263—Macromolecular coatings characterised by the use of polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- B41M5/5272—Polyesters; Polycarbonates
Definitions
- the present invention relates to a pretreatment method for coating or printing on a surface of a metal base material (having a thermal conductivity of 10 W / mK or more) having specific characteristics with a paint or ink containing a resin.
- Patent Document 1 an outer surface including applying a coating agent to a steel pipe when the temperature of the steel pipe reaches 50 to 70 ° C. after removing moisture, dust, oil, etc. adhering to the surface of the steel pipe with a flame of a burner.
- a method for accelerating the curing of a coating agent is disclosed.
- the surface of a steel pipe is sufficiently coated with rust preventive oil.
- rust preventive oil In order to burn away the rust-preventing oil, it is necessary to heat it to at least 400 ° C. for a certain period of time, which may cause problems in quality as a product such as oxidation of the metal surface. Therefore, means such as alkaline degreasing are usually used to remove oils attached to the metal surface such as rust preventive oil, and it is generally practiced to remove the oil on the metal surface by burning. I have not been told.
- Patent Document 2 the surface of a metal strip such as a stainless steel strip or an alloy strip is cleaned with a cleaning solution such as an organic solvent or an alkali solution after the oil or solid deposit adhered in the manufacturing process is cleaned with a flame treatment. Is disclosed.
- the inventors of the present invention have devised and studied to remove the foreign matter adhering to the surface of the metal base material by flame treatment before painting or printing the paint or ink on the metal base material, When performing a flame treatment, it turned out that the adhesiveness and wettability of a subsequent coating film and printing ink are not enough.
- the present inventors have found that the cause of the decrease in the adhesion and wettability of the coating film and printing ink is condensation that occurs during the flame treatment, and this is a metal with high thermal conductivity. It was found to be a phenomenon peculiar to the system base material.
- the present inventors have suppressed the condensation by preheating the temperature of the metal base material to 40 ° C. or more before the flame treatment. It has been found that the adhesion or wettability of the coating film or printing ink is improved. Furthermore, the present inventor has devised continuous preheating and flame treatment in a series of steps in order to efficiently perform the treatment before painting or printing.
- the present invention provides a paint or ink on the surface of a metal base material having a thermal conductivity of 10 W / mK or more, which is selected from a plated steel plate, a degreased plain steel plate, a stainless steel plate, a coated steel plate, an aluminum plate and a copper plate.
- a method of pre-coating or printing a metal-based substrate surface which comprises preheating the substrate to 40 ° C. or higher before coating or printing with a coating, and then continuously flame-treating the surface of the substrate. I will provide a.
- preheating means include installing a preheating gas burner in the pretreatment line and installing a conveyor type near-infrared furnace or mid-infrared furnace in the pretreatment line.
- a burner using liquefied petroleum gas (LPG) or liquefied natural gas (LNG) as a fuel is widely used.
- LPG liquefied petroleum gas
- LNG liquefied natural gas
- the metal base material having high thermal conductivity used in the present invention when flame treatment is performed by a burner without preheating, heat is quickly diffused at the moment when the flame contacts the metal base material, and the temperature of the spot Will go down. Therefore, water that has become water vapor in the flame is cooled on the surface of the base material, and condensation occurs on the surface of the metal base material. This condensed water stays on the surface of the metal base material during the flame treatment and interferes with the flame treatment.
- the metal base material having a specific thermal conductivity to 40 ° C or higher when flame-treating, the occurrence of condensation is suppressed and the foreign matter adhering to the surface of the metal base material is removed.
- the adhesion and wettability of the coating film or printing ink can be improved. Furthermore, in the pretreatment method of the present invention, it is possible to perform preheating and flame treatment continuously, so that the productivity is high and the treatment can be performed efficiently.
- (A) is a photograph showing an example of a ribbon type
- (b) is a photograph showing an example of a round hole type. It is the figure which showed an example of the flame outlet of the ribbon burner which can be used by this invention. In an Example, it is the figure which showed the temperature decay curve when each metal type base material was pre-heated to 100 degreeC with the gas burner.
- Curve i represents an acrylic plate
- curve ii represents an austenitic stainless steel plate
- curve iii represents a coated steel plate
- curve iv represents an aluminum alloy plate.
- the temperature decay curve iii in the coated steel sheet is almost the same as the temperature decay curve of the ferritic stainless steel sheet and the hot-dip Zn-55% Al alloy-plated steel sheet, so that the description of these curves is omitted.
- the vertical axis of this table represents the substrate surface temperature (° C.), and the horizontal axis represents the elapsed time (seconds).
- the present invention uses a metal-based substrate having a thermal conductivity of 10 W / mK or more for coating or printing with paint or ink.
- a metal base material having a thermal conductivity of 15 W / mK or more, more preferably 30 W / mK or more, and most preferably 40 W / mK or more is used.
- the thermal conductivity is less than 10 W / mK, since the thermal diffusion of the base material is low, there is no need for preheating because no condensation occurs even if the water vapor contained in the flame comes into contact with the base material.
- the metal base material of the present invention has a thermal conductivity of 10 W / mK or more.
- a plated steel plate such as a molten Zn-55% Al alloy-plated steel plate, a stainless steel plate, an aluminum plate, a copper plate, and a plain steel plate that has been degreased are used.
- the aluminum plate includes an aluminum alloy mainly composed of aluminum.
- oils such as rust preventive oil are not applied.
- a stainless steel plate may be coated with oil such as lubricating oil or rolling oil in a production line, but the surface is finally cleaned in a cleaning process.
- oil such as lubricating oil or rolling oil in a production line
- the surface is finally processed and it becomes difficult to generate
- the surface of the aluminum plate is immediately covered with aluminum oxide to prevent further oxidation, it does not rust and deteriorate its quality.
- copper plates copper is not as easily rusted as iron, and this also does not require application of oil such as anti-rust oil.
- a normal steel plate for the treatment method of the present invention a normal steel plate that has been degreased is used.
- a known degreasing treatment such as an alkali treatment or a solvent treatment can be used.
- the metal-type base material used by this invention is an elongate rectangular shape when a coating apparatus and a printing apparatus are considered.
- These metal base materials may be embossed, drawn or the like, and subjected to irregularities such as tile, brick, and wood grain.
- the metal-based substrate may have a chemical conversion treatment film formed on the surface thereof.
- the chemical conversion film is formed on the entire surface of the base material, and improves the corrosion resistance of the base material.
- the kind of chemical conversion treatment which forms a chemical conversion treatment film is not specifically limited. Examples of the chemical conversion treatment include chromate treatment, chromium-free treatment, and phosphate treatment.
- the adhesion amount of the chemical conversion coating is not particularly limited as long as it is within a range effective for improving the corrosion resistance.
- the coated steel sheet in which the coating film by the coating material was provided in the one surface or both surfaces of the said steel plate is also contained in the metal-type base material used by this invention.
- the coated steel sheet as the metal-based substrate of the present invention is obtained by forming an ink-receiving layer after arbitrarily forming a chemical conversion treatment film and / or an undercoat film on the steel sheet.
- the chemical conversion coating is formed on the entire surface of the steel sheet, and improves coating film adhesion and corrosion resistance.
- An example of the chemical conversion treatment is as described above.
- the undercoat coating film is formed on the surface of the steel plate or the chemical conversion coating film, and improves the adhesion and corrosion resistance of the coating film.
- the undercoat coating film is formed, for example, by applying an undercoat paint containing a resin to the surface of a steel sheet or a chemical conversion treatment film and drying (or curing).
- the kind of resin contained in the undercoat paint is not particularly limited. Examples of the type of resin include polyester, epoxy resin, acrylic resin, and the like. Epoxy resins are particularly preferred because of their high polarity and good adhesion.
- the film thickness of an undercoat coating film will not be specifically limited if said function can be exhibited.
- the film thickness of the undercoat coating film is, for example, about 5 ⁇ m.
- the ink receiving layer of the coated steel sheet used in the present invention is formed using a resin composition containing a resin and a pigment for forming a matrix as a paint.
- the kind of resin used as the matrix is not particularly limited.
- the resin serving as the matrix include polyester, acrylic resin, polyvinylidene fluoride, polyurethane, epoxy resin, polyvinyl alcohol, and phenol resin.
- the resin serving as the matrix is preferably polyester, acrylic resin, or polyvinylidene fluoride.
- the resin composition at that time has polyester, a melamine resin, a catalyst, and an amine, for example.
- the kind of polyester is not particularly limited as long as it can cause a crosslinking reaction with the melamine resin.
- the number average molecular weight of the polyester is not particularly limited, but is preferably 5000 or more from the viewpoint of processability.
- the hydroxyl value of the polyester is not particularly limited, but is preferably 40 mgKOH / g or less.
- the glass transition point of the polyester is not particularly limited, but is preferably in the range of 0 to 70 ° C. When the glass transition point is less than 0 ° C., the hardness of the ink receiving layer may be insufficient. On the other hand, when the glass transition point is higher than 70 ° C., the workability may be reduced.
- Melamine resin is a polyester cross-linking agent.
- the melamine resin is not particularly limited, but is preferably a methylated melamine resin.
- the methylated melamine resin preferably has a methoxy group content in the functional groups in the molecule of 80 mol% or more.
- a methylated melamine resin may be used alone or in combination with other melamine resins.
- the catalyst promotes the reaction of the melamine resin.
- the catalyst include dodecylbenzenesulfonic acid, paratoluenesulfonic acid, and benzenesulfonic acid.
- the blending amount of the catalyst is preferably about 0.1 to 8% with respect to the resin solid content.
- the amine neutralizes the catalytic reaction. Examples of the amine include triethylamine, dimethylethanolamine, dimethylaminoethanol, monoethanolamine, and isopropanolamine.
- the compounding quantity of an amine is not specifically limited, It is preferable that it is the quantity of 50% or more of an equivalent with respect to an acid (catalyst).
- the resin for forming the matrix is an acrylic resin
- an acrylic resin emulsion is used.
- the molecular weight of the acrylic resin in the emulsion is preferably in the range of 200,000 to 2,000,000.
- the molecular weight of the acrylic resin in the emulsion can be measured by gel permeation chromatography (GPC).
- the resin for forming the matrix is polyvinylidene fluoride
- a resin composition in which a thermoplastic acrylic resin is mixed with polyvinylidene fluoride in a weight ratio of 20/80 to 50/50 can be used as a coating material.
- Examples of the pigment used in the ink receiving layer include extender pigments (including beads) and colored pigments.
- the kind of extender pigment is not particularly limited.
- Examples of extender pigments include silica, calcium carbonate, barium sulfate, aluminum hydroxide, talc, mica, resin beads, glass beads and the like.
- the type of resin beads is not particularly limited.
- the resin beads include acrylic resin beads, polyacrylonitrile beads, polyethylene beads, polypropylene beads, polyester beads, urethane resin beads, and epoxy resin beads. These resin beads may be produced using a known method, or commercially available products may be used. Examples of commercially available acrylic resin beads include “Tough Tick AR650S (average particle size 18 ⁇ m)”, “Tough Tick AR650M (average particle size 30 ⁇ m)”, “Tough Tick AR650MX (average particle size 40 ⁇ m)”, “Tough Tick AR650MZ”.
- Tough Tick AR650ML Average particle diameter 80 ⁇ m
- Tough Tick AR650L average particle diameter 100 ⁇ m
- Tough Tick AR650LL average particle diameter 150 ⁇ m
- Examples of commercially available polyacrylonitrile beads include “Toughtic A-20 (average particle size: 24 ⁇ m)”, “Toughtic YK-30 (average particle size: 33 ⁇ m)”, “Toughtic YK-50 (average particle size) manufactured by Toyobo Co., Ltd. And “Toughtic YK-80 (average particle size 80 ⁇ m)”.
- the kind of coloring pigment is not particularly limited.
- the color pigment include carbon black, titanium oxide, iron oxide, yellow iron oxide, phthalocyanine blue, and cobalt blue.
- the type of pigment, the particle size, and the content in the resin composition (paint) can be appropriately adjusted by those skilled in the art depending on the type of printing and the type of ink to be printed.
- the thickness of the ink receiving layer is not particularly limited, but is usually in the range of 3 to 30 ⁇ m.
- a coating film is too thin, there exists a possibility that durability and concealment property of a coating film may become inadequate.
- the coating film is too thick, the manufacturing cost increases, and there is a possibility that a crack is likely to occur during baking.
- the thermal conductivity in the present invention can be measured by a method based on JIS R1611-2010 (corresponding international standard: ISO 18755: 2005). Specifically, a 10 mm square sample can be prepared and measured using a laser flash method thermophysical property measuring apparatus LFA-502 manufactured by Kyoto Electronics Industry Co., Ltd.
- coated steel sheets such as hot-dip Zn-55% Al alloy-plated steel sheets, stainless steel sheets, aluminum sheets, copper sheets, and degreased plain steel sheets, which are not coated with resin on the surface
- preheating and flame treatment are preferably performed several hours before printing. Specifically, it is preferably within 4 hours for coating or printing on the metal-based substrate, more preferably within 2 hours, still more preferably within 30 minutes, and most preferably within 10 minutes.
- time until painting or printing exceeds 4 hours after the flame treatment, foreign matters such as dust and dirt again adhere to the surface of the base material again, and the effect of the pretreatment method of the present invention is fully exhibited. I can't.
- a metal base material with a resin coating such as a coated steel plate is less susceptible to dirt as compared to the metal base material without the resin coating, and therefore flame treatment for several months (for example, about 6 months). The effect can be maintained. Therefore, the coated steel sheet may be processed several months after the flame treatment, or may be treated within the same time as the above steel sheet after the flame treatment.
- the metal-based substrate is preheated to 40 ° C. or higher.
- the means for preheating the base material is not particularly limited as long as it can be flame-treated continuously after preheating. Specifically, preheating using a gas burner, or a conveyor type (line type) heating furnace is used. Can be used. As the heating furnace, a near-infrared furnace or a mid-infrared furnace is preferable.
- the temperature of the preheating of this invention points out the temperature just before a flame process, and is not necessarily the same as the temperature immediately after preheating.
- the present invention includes a step of preheating and flame-treating a metal base material having a temperature of 40 ° C. or higher. Specifically, it refers to a temperature measured within 3 seconds, preferably within 1 second, more preferably within 0.5 seconds until flame treatment.
- preheating it is preferable to perform preheating at a higher temperature, because unevenness in flame treatment can be reduced. Specifically, it is preferable to preheat to 45 ° C. or higher, more preferably to preheat to 50 ° C. or higher, 55 More preferably, it is 60 ° C. or higher. In addition, it is preferable to preheat the metal base material having a higher thermal conductivity at a higher temperature. For example, in the case of a substrate having a thermal conductivity of 100 W / mK or higher, preheating is preferably performed at 60 ° C. or higher, and more preferably preheated at 65 ° C. or higher.
- the upper limit of the preheating temperature is not particularly limited, but it is preferable to preheat the metal base so that the temperature of the metal base does not exceed 300 ° C. in consideration of deterioration due to oxidation of the surface of the metal base. Therefore, the upper limit of the preheating temperature is preferably less than 300 ° C.
- a gas burner is used.
- the gas burner used here can be a gas burner that is generally used for surface treatment of steel plates or coated steel plates.
- LPG liquefied petroleum gas
- LNG liquefied natural gas
- acetylene gas propane gas, or butane
- air or oxygen is used as the auxiliary gas.
- LPG or LNG In consideration of combustion energy, it is preferable to use LPG or LNG.
- the mode of the flame outlet is not particularly limited, but a ribbon type or round hole type gas burner can be usually used.
- An example of the Ripon type is shown in FIG. 5 (a), and an example of the round hole type is shown in FIG. 5 (b).
- a ribbon burner as a gas burner for flame treatment.
- Burners having a burner head having such a structure are commercially available.
- product name F-3000 ribbon burner: see FIG. 6) of Flynn Burner (USA), product name FFP250 of Finecom I & T (Korea), etc.
- the width of the burner flame opening (the width parallel to the width direction of the metal base material) must be the width that the flame is irradiated to the entire surface of the base material. Select the appropriate burner. For example, when the width in the width direction of the metal base is 40 cm, a burner having a flame opening width of 45 to 50 cm is selected. (For example, in FIG. 2, when W1 is 40 cm, a gas burner having W2 of 45 to 50 cm is selected.)
- the burner output of the burner is 250 kJ / hour to 12000 kJ / hour, preferably 400 kJ / hour to 7500 kJ / hour, more preferably 600 kJ / hour to 5000 kJ / hour, and even more preferably 1200 kJ / hour per 10 mm of the width of the burner flame. Adjust the output to 5,000kJ / hour.
- the gas burner for flame treatment one or more gas burners can be used.
- the conveyance speed of the metal base material at the time of the flame treatment increases, an air flow accompanying the conveyance of the metal base material is generated, and the flame is affected by the air flow, and the efficiency of the flame treatment may be deteriorated. Therefore, it is preferable to use two or more gas burners for flame treatment when the conveying speed of the metal-based substrate is high. It is also possible to perform flame treatment using three or more flame treatment gas burners. However, considering the capital investment, production efficiency, and the effects of flame treatment, if the conveyance speed is large, 2 It is preferable to use a flame burner gas burner.
- the same paint (which may or may not contain a pigment) as the resin composition used in the ink receiving layer is applied.
- a coating method a known method such as a roll coater method or a bar coater method can be used.
- a known printing method can be used.
- the printing method include gravure printing, offset printing, screen printing, and ink jet printing.
- inkjet printing is a preferable printing method because it can easily form a complicated multicolor pattern in a short time.
- the ink used for inkjet printing can be a known ink, and specific examples include water-based ink, oil-based ink, and actinic ray curable ink. Since the effect of the present invention is remarkably recognized, it is preferable to use an actinic ray curable ink.
- the actinic ray curable ink includes a radical polymerization type ink and a cationic polymerization type ink, and any of them can be used.
- the actinic ray curable ink usually contains a monomer or oligomer, a photopolymerization initiator, a coloring material, a dispersant, a surfactant, and other additives.
- the material generally used in the said technical field is used.
- the cationic polymerization type ink is particularly preferable because it has a smaller volume shrinkage than the radical polymerization type ink and can provide high adhesion to an impermeable ink-receiving layer having an increased crosslinking density.
- the “active ray” in the present invention includes electron beam, ultraviolet ray, ⁇ ray, ⁇ ray, X ray and the like.
- actinic ray curable ink is cured with actinic rays from an actinic ray irradiator after landing on the printed surface of the substrate.
- actinic rays are irradiated after 1.0 second or more, preferably 2.0 seconds or more, and more preferably 2.2 seconds or more after the ink droplet has landed.
- water in the air may inhibit the polymerization of the ink, the actinic ray is irradiated within 30 seconds after the ink has landed.
- FIG. 1 is a metal-based substrate (also referred to as “substrate 1”)
- 2 is a preheating gas burner
- 3 is a first flame treatment gas burner
- 4 is a second flame treatment gas burner
- 5 represents an ink jet printer
- 6 represents an actinic ray irradiator
- 7 represents a transport device.
- the base material 1 is placed on the transport machine 7 and transported in the direction of the broken line arrow in FIG.
- the base material 1 is preheated with a preheating gas burner and subjected to a flame treatment at a temperature of 40 ° C. or higher with the first and second gas burners.
- the substrate surface is printed by the inkjet printer 5 after the flame treatment.
- the actinic ray irradiator 6 irradiates actinic rays to cure the ink.
- the conveyance speed of the substrate 1 by the conveyance machine 7 varies depending on printing conditions and the like, but is generally 10 m / min to 50 m / min, preferably 20 m / min to 40 m / min.
- reference numeral 1 denotes a preheating gas burner.
- this preheating gas burner a commercially available gas burner similar to the flame treatment gas burner can be used.
- the output of the preheating gas burner may be any output as long as the temperature of the metal substrate 1 is 40 ° C. or higher, and may be the same as the output of the gas burner for the flame treatment.
- it is 250 kJ / hr to 12000 kJ / hr, preferably 400 kJ / hr to 7500 kJ / hr, more preferably 600 kJ / hr to 5000 kJ / hr, and even more preferably 1200 kJ / hr per 10 mm of the width of the flame outlet of the burner. Adjust the output to ⁇ 5000kJ / hour. Moreover, since the metal-type base material 1 should just be 40 degreeC or more at the time of preheating, it is preferable that an output is lower than a flame treatment.
- the output of the gas burner for preheating is preferably 25% to 95% of the output for flame treatment, more preferably 30% to 90%, and more preferably 30% to 80%. More preferably.
- the temperature of the metal base material can be adjusted so as not to be heated excessively.
- each gas burner is installed so that there is at least 1 second, more preferably 2 seconds or more until it is treated by the first flame treatment gas burner 3 after being treated by the preheating gas burner 2. Adjust.
- a time decay curve of the surface temperature of the base material 1 is created in advance, and the desired temperature of the base material surface during the first flame treatment is defined from the graph, and the time from the pre-heat treatment to the first flame treatment is defined.
- Set Considering both the time until evaporation of the above condensation and the time for setting the surface temperature of the base material 1 to the desired temperature (at least 40 ° C. or higher) when receiving the first flame treatment, for preheating.
- set the time from the first flame treatment to the first flame treatment Accordingly, the distance D1 between the preheating gas burner 2 and the first flame treatment gas burner 3 is determined by the set time and the conveying speed (FIG. 2).
- the time until the substrate 1 is treated with the second flame treatment gas burner after the treatment with the first flame treatment gas burner is such that the temperature of the substrate after the first flame treatment does not become less than 40 ° C. Set to.
- a time decay curve of the surface temperature of the base material 1 is created in advance, and a desired temperature of the base material surface at the time of the second flame processing is defined from the graph, and from the first flame processing.
- the time until the second flame treatment is set. Therefore, the distance D2 between the first flame treatment gas burner 3 and the second flame treatment gas burner 4 is determined by the set time and the conveying speed (FIG. 2).
- the conveying speed when the conveying speed is high, it is preferable to install two or more flame treatment gas burners.
- the conveyance speed in this case is 20 m / min or more, an air flow accompanying the conveyance of the substrate 1 is generated, and the efficiency of the flame treatment may be reduced.
- two flame treatment gas burners as shown in FIG.
- the arrangement of the preheating gas burner 2 and the first flame treatment gas burner 3 is preferably arranged apart from each other in a parallel direction so that the substrate can be treated uniformly.
- the flame treatment gas burners are arranged apart from each other in parallel directions.
- the preheating gas burner 2 and the first flame treatment gas burner 3 are arranged in a direction perpendicular to the conveying direction. It is preferable that it is installed.
- the respective flame treatment gas burners are arranged apart from each other in a direction perpendicular to the conveyance direction of the substrate 1.
- the base material 1 subjected to the flame treatment as described above is printed with the actinic ray curable ink by the ink jet printer 5 and irradiated with the actinic ray irradiator 6 to cure the ink and complete the printing.
- FIG. 3 1 is a base material
- 8 is a conveyor-type near-infrared furnace or mid-infrared furnace (hereinafter referred to as “preheating furnace”)
- 3 is a first flame treatment gas burner
- 4 is a second flame treatment.
- Gas burner for use 5 is an ink jet printer
- 6 is an actinic ray irradiator
- 7 is a conveyor.
- the substrate 1 is placed on the transporter 7 and transported in the direction of the broken line arrow in FIG.
- the substrate 1 is preheated in the preheating furnace 8 and subjected to flame treatment with the first and second gas burners at a temperature of 40 ° C. or higher.
- the substrate surface is printed by the inkjet printer 5 after the flame treatment.
- the actinic ray irradiator 6 irradiates actinic rays to cure the ink.
- the substrate conveying speed by the conveying machine 7 varies depending on the printing conditions and the like, but is generally 10 m / min to 50 m / min, preferably 20 m / min to 40 m / min.
- the near infrared ray is an electromagnetic wave having a maximum energy wavelength of 0.8 ⁇ m or more and less than 1.8 ⁇ m
- the middle infrared ray is an electromagnetic wave having a maximum energy wavelength of 1.8 to 3.0 ⁇ m.
- the maximum energy wavelength of near-infrared is more preferably 0.8 to 1.5 ⁇ m
- the maximum energy wavelength of mid-infrared is more preferably 2.0 to 2.7 ⁇ m.
- the base material 1 is preheated to 40 ° C to 300 ° C, preferably 50 to 200 ° C, more preferably 60 to 150 ° C, and still more preferably 70 to 120 ° C.
- the time until the preheated substrate 1 is subjected to the first flame treatment is set so that the temperature of the substrate 1 does not fall below 40 ° C. before the flame treatment is performed.
- the setting of the time from the flame treatment by the first flame treatment gas burner to the flame treatment by the second flame treatment gas burner is as described above. Further, the arrangement of the first flame treatment gas burner and the second flame treatment gas burner is, as shown in FIG. 4, spaced apart in a direction perpendicular to the conveying direction of the substrate 1. Preferably it is.
- This plated steel sheet is degreased with alkali, followed by coating type chromate (NRC300NS: Nippon Paint Co., Ltd., Cr, 50 mg / m 2 adhesion amount), and a commercially available epoxy resin primer coating primer layer (Nihon Fine Coatings Co., Ltd. 700P) ) was coated with a roll coater so that the dry film thickness was 5 ⁇ m, and then baked to a maximum plate temperature of 215 ° C.
- the contents of the paint which is a resin composition for forming the ink receiving layer, are as follows.
- a resin a high molecular polyester resin (manufactured by DIC) having a number average molecular weight of 5,000, a glass transition temperature of 30 ° C., and a hydroxyl value of 28 mgKOH / g was used.
- a melamine resin which is a cross-linking agent a methylated melamine resin having 90 mol% of methoxy groups (Cymel 303 manufactured by Mitsui Cytec) was used.
- the blending ratio of the polyester resin and the melamine resin is 70/30.
- titanium oxide having an average particle diameter of 0.28 ⁇ m JR-603 manufactured by Teika
- mica having an average particle diameter of 10 ⁇ m
- Hydrophobic silica (Silicia 456) 13 mass%, average particle size 5.5 ⁇ m hydrophobic silica (Silicia 456; Fuji Silysia Co., Ltd.) 6 mass%, average particle size 12 ⁇ m 2% by weight was added.
- As the catalyst 1% by mass of dodecylbenzenesulfonic acid was added to the resin solid content.
- dimethylaminoethanol as an amine was added in an amount of 1.25 times as an amine equivalent with respect to an acid equivalent of dodecylbenzenesulfonic acid. After coating with a roll coater so that the dry film thickness of the paint was 18 ⁇ m, it was baked to a maximum plate temperature of 225 ° C.
- thermal conductivity of various base materials was measured by a method based on JIS R1611-2010 (corresponding international standard: ISO 18755: 2005). Specifically, a 10 mm square sample was prepared and measured using a laser flash method thermophysical property measuring apparatus LFA-502 manufactured by Kyoto Electronics Industry Co., Ltd.
- Preheating method of base material (i) Preheating method using preheating gas burner Preheating of various base materials is performed using product name F-3000 manufactured by Flynn Burner (USA). Ribbon type. LP gas is used as the combustion gas, and LP gas 0.4L / min and clean dry air 10L / min are mixed with a gas mixer for every 10mm width of the burner flame mouth, and then burned with a burner for preheating flame Processed. Preheating was performed at a distance between the flame outlet of the burner and the base material of 30 mm and a processing (conveyance) speed of 20 m / min.
- Flame treatment method for various substrates Flame treatment was performed on various substrates preheated under the above conditions using one or two product names F-3000 manufactured by Flynn Burner (USA). All aspects of the burner head are of the ribbon type.
- the treatment conditions were as follows: LP gas 1.2 L / min and clean dry air 30 L / min were mixed with a gas mixer with respect to a width of 10 mm of the flame outlet of the burner, and then burned with a burner to perform flame treatment. Preheating was performed at a distance between the flame outlet of the burner and the base material of 30 mm and a processing (conveyance) speed of 20 m / min. The distance between the first burner head and the second burner head was 30 cm.
- the temperature of the base-material surface at the time of a flame processing is a temperature of the base material just before a flame processing (0.2 second before) using a thermocouple thermometer (K type).
- Inkjet printing with actinic ray curable ink Ink jet printing was performed using an actinic ray curable inkjet ink about 2 minutes after the flame treatment.
- As the active curable ink radical polymerization type ultraviolet curable black ink and cationic polymerization type ultraviolet curable black ink were used.
- the specific composition of each ink is as follows.
- (I) Radical polymerization type ultraviolet curable black ink A radical polymerization type ultraviolet curable black ink was prepared by mixing the following components. The specific composition is as follows. Pigment dispersion 1) (Pigment content: 10% by weight) 10 parts by weight Reactive oligomer 2) 25 parts by weight Reactive oligomer 3) 57 parts by weight Photopolymerization initiator 4) 5 parts by weight Photopolymerization initiator 5) 3 parts by weight
- Pigment NIPex 35, manufactured by Carbon Degussa Japan Co., Ltd., dispersion medium: SR9003, PO-modified neopentyl glycol diacrylate manufactured by Sartomer Japan Co., Ltd. 2) CN985B88, bifunctional aliphatic urethane acrylate 88% by mass, 1, Mixture of 12% by mass of 6-hexanediol diacrylate 3) 1,6-hexanediol diacrylate 4) Irgacure 184, hydroxyketones 5) Irgacure 819, acylphos Fin oxides Ciba Japan Co., Ltd.
- ultraviolet rays were used as the actinic rays.
- the ink was subjected to ultraviolet curing under the following conditions after inkjet printing. The ultraviolet irradiation was performed 5 seconds after the ink droplet landed.
- Lamp type High-pressure mercury lamp (H bulb manufactured by Fusion UV Systems Japan Co., Ltd.)
- Lamp output 200 W / cm
- Integrated light quantity 600 mJ / cm 2 (measured using an UV light quantity meter UV-351-25 manufactured by Oak Manufacturing)
- a film with a peeled area of 0% was evaluated as “ ⁇ ”, a film with a peeled area exceeding 0% and within 20% was evaluated as “ ⁇ ”, and a film with a peeled area exceeding 20%.
- X was evaluated more than (triangle
- the substrate having a high thermal conductivity when the temperature immediately before the flame treatment of the substrate is less than 40 ° C., the substrate having a high thermal conductivity, the wettability and adhesion of the printing ink after the flame treatment may be deteriorated. I understand.
- the acrylic plate does not affect the wettability and adhesion of the printing ink even if the temperature immediately before the flame treatment is less than 40 ° C.
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Abstract
Description
一般に、鋼管の表面は防錆油が十分に塗布されている。防錆油を燃焼させて除去するためには、一定時間、少なくとも400℃以上に加熱する必要があるため、金属表面が酸化するなどの、製品として品質に問題をきたすことがある。そのため、防錆油などの金属表面に付着した油類を除去するためには、通常、アルカリ脱脂などの手段が用いられており、金属表面上の油類を燃焼させて除去することは一般に行われていない。
さらに、本発明者は、塗装又は印刷前の処理を効率よく行うため、予熱及び火炎処理を一連の工程で、連続して行うことを考案した。
C3H8(LPG)+5O2 → 3CO2+4H2O+熱
さらに、本発明の前処理方法では、予熱及び火炎処理を連続的に行うことが可能であり、生産性が高く効率よく処理できる。
熱伝導率が10W/mK未満の場合は、基材の熱拡散が低いため、火炎に含まれる水蒸気が基材と接触しても結露とはならないため、予熱の必要がない。
これらの金属系基材には、エンボス加工や絞り成型加工などを行って、タイル調、レンガ調、木目調などの凹凸加工を施してもよい。
本発明の金属系基材としての塗装鋼板は、上記の鋼板に任意に化成処理皮膜及び/又は下塗り塗膜を形成した後、インキ受理層を形成させて得られる。
化成処理皮膜は、鋼板の表面全体に形成されており、塗膜密着性および耐食性を向上させる。化成処理の例は上述の通りである。
マトリックスとなる樹脂の種類は、特に限定されない。マトリックスとなる樹脂の例には、ポリエステル、アクリル樹脂、ポリフッ化ビニリデン、ポリウレタン、エポキシ樹脂、ポリビニルアルコール、フェノール樹脂が含まれる。インキとの密着性の観点からは、マトリックスとなる樹脂は、ポリエステル、アクリル樹脂またはポリフッ化ビニリデンが好ましい。
ポリエステルの種類は、メラミン樹脂と架橋反応を起こすことができれば、特に限定されない。ポリエステルの数平均分子量は、特に限定されないが、加工性の観点からは5000以上であることが好ましい。また、ポリエステルの水酸基価も、特に限定されないが、40mgKOH/g以下であることが好ましい。ポリエステルのガラス転移点は、特に限定されないが、0~70℃の範囲内であることが好ましい。ガラス転移点が0℃未満の場合、インキ受理層の硬度が不足するおそれがある。一方、ガラス転移点が70℃超の場合、加工性が低下するおそれがある。
アミンは、触媒反応を中和する。アミンの例には、トリエチルアミン、ジメチルエタノールアミン、ジメチルアミノエタノール、モノエタノールアミン、イソプロパノールアミンが含まれる。アミンの配合量は、特に限定されないが、酸(触媒)に対して当量の50%以上の量であることが好ましい。
体質顔料の種類は、特に限定されない。体質顔料の例には、シリカ、炭酸カルシウム、硫酸バリウム、水酸化アルミニウム、タルク、マイカ、樹脂ビーズ、ガラスビーズなどが含まれる。
以上の顔料について、顔料の種類、粒径や樹脂組成物(塗料)中の含量は、印刷の種類や印刷されるインクの種類によって当業者が適宜調整することができる。
塗装又は印刷までの時間が、火炎処理して4時間を超えて経過すると、再び、基材表面に塵や埃などの異物が再び付着し、本発明の前処理方法の効果を十分に発揮することができない。なお、塗装鋼板等の樹脂被覆を施した金属系基材は、上記樹脂被覆のない金属系基材と比較して汚れが付着しにくいため、数ヶ月間(例えば、6カ月程度)、火炎処理効果を維持することができる。従って、塗装鋼板は火炎処理後数か月後に処理されてもよく、また、火炎処理後、上記の鋼板と同様の時間内に処理されてもよい。
なお、本発明の予熱の温度は、火炎処理直前の温度を指し、予熱直後の温度とは必ずしも同じではない。換言すれば、本発明は予熱して40℃以上の温度を有する金属系基材を火炎処理する工程を含む。具体的には、火炎処理まで3秒以内、好ましくは1秒以内、更に好ましくは0.5秒以内に測定した温度を指す。
また、予熱温度の上限は特に限定されないが、金属系基材表面の酸化による劣化を考慮して、金属系基材の温度が300℃を超えないように金属系基材を予熱するのが好ましいため、予熱温度の上限は300℃未満とすることが好ましい。
バーナーの炎口の幅(金属系基材の幅方向に平行な広さ)は、基材表面全体に火炎が照射される広さである必要があり、基材の幅方向の広さに合わせて適切なバーナーを選択する。例えば、金属系基材の幅方向の広さが40cmの場合は、炎口の幅が45~50cmであるバーナーを選択する。(例えば、図2において、W1が40cmの場合は、W2が45~50cmであるガスバーナーを選択する。)
搬送機7による基材1の搬送速度は、印刷条件等により異なるが、一般に10m/分~50m/分、好ましくは、20m/分~40m/分である。
予熱用ガスバーナーの出力は、金属系基材1の温度が40℃以上の温度となるような出力であればよく、上記の火炎処理のためのガスバーナーの出力と同じであってもよい。具体的には、バーナーの炎口の幅10mmあたり250kJ/時~12000kJ/時、好ましくは、400kJ/時~7500kJ/時、さらに好ましくは600kJ/時~5000kJ/時、なお更に好ましくは1200kJ/時~5000kJ/時の出力に調整する。また、金属系基材1が予熱時に40℃以上になればよいため、火炎処理よりも出力が低いことが好ましい。具体的に、予熱のためのガスバーナーの出力は火炎処理のための出力の25%~95%であることが好ましく、30%~90%であることがより好ましく、30%~80%であることが更に好ましい。このように、予熱用ガスバーナーの出力を制御することで、金属系基材の温度が過度に加熱されないように調整できる。
以上の結露の蒸発までの時間と、最初の火炎処理を受ける時の基材1の表面温度を所望の温度(少なくとも40℃以上)とするための時間との双方を考慮して、予熱のための火炎処理から最初の火炎処理までの時間を最終的に設定する。
従って、予熱用ガスバーナー2と第1の火炎処理用ガスバーナー3との距離D1は、上記の設定した時間と搬送速度により定められる(図2)。
従って、第1の火炎処理用ガスバーナー3と第2の火炎処理用ガスバーナー4との距離D2は、上記の設定した時間と搬送速度により定められる(図2)。
搬送機7による基材の搬送速度は、印刷条件等により異なるが、一般に10m/分~50m/分、好ましくは、20m/分~40m/分である。
予熱された基材1が最初の火炎処理を受けるまでの時間は、基材1の温度が火炎処理を受けるまでに40℃を下回らない時間を設定する。これは、基材1の表面温度の時間減衰曲線を作成し、そのグラフから、最初の火炎処理を受ける時の基材表面の所望の温度を規定し、予熱処理から最初の火炎処理までの時間を設定する。
従って、予熱炉8から第1の火炎処理用ガスバーナー3までの距離は、上記の手段で定めた時間と搬送速度により定められる。
なお、予熱炉8の予熱では、ガスバーナーによる予熱とは異なり、結露が発生することはない。
また、第1の火炎処理用ガスバーナーと第2の火炎処理用ガスバーナーの配置は、図4に記載のように、基材1の搬送方向に対し、垂直な向きで離間して配置されていることが好ましい。
金属系基材として、オーステナイト系ステンレス板、塗装鋼板、フェライト系ステンレス板、溶融Zn-55%Al合金めっき鋼板、アルミニウム合金板を用い、参考基材としてアクリル板を用いた。
(1)オーステナイト系ステンレス板
日新製鋼株式会社製の板厚0.5mm、SUS304 BAをA4サイズにカットして使用した。
(2)塗装鋼板
板厚0.5mm、A4サイズの片面当りめっき付着量90g/m2の溶融Zn-55%Al合金めっき鋼板を使用した。このめっき鋼板をアルカリ脱脂した後、塗布型クロメート(NRC300NS:日本ペイント株式会社製 Crとして50mg/m2の付着量)、プライマー層として市販のエポキシ樹脂系プライマー塗料(日本ファインコーティングス株式会社製700P)を乾燥膜厚が5μmとなるようにロールコーターで塗装した後、最高到達板温215℃となるように焼き付けた。
日新製鋼株式会社製の板厚0.5mm、SUS430 BAをA4サイズにカットして使用した。
(4)溶融Zn-55%Al合金めっき鋼板
日新製鋼株式会社製の板厚0.5mmの片面当りめっき付着量90g/m2の溶融Zn-55%Al合金めっき鋼板をA4サイズにカットして使用した。
(5)アルミニウム合金板
三菱アルミニウム株式会社製の板厚0.5mm、JIS 5052のアルミニウム合金板をA4サイズにカットして使用した。
(6)アクリル板(参考例)
三菱レイヨン株式会社製の板厚2.0mmのアクリル板(商品名 アクリライトS)をA4サイズにカットして使用した。
各種基材の熱伝導率はJIS R1611-2010(対応国際規格:ISO 18755:2005)に準拠する方法で測定した。具体的には10mm角のサンプルを準備して京都電子工業株式会社製レーザーフラッシュ法熱物性測定装置LFA-502を用いて測定した。
熱電対温度計(Kタイプ)(日置電機株式会社・温度ロガーLR5021)とセンサー(安立計器株式会社・テープ型多目的温度センサー)を上記各種の基材表面の中央に溶接して取り付け測定した。
ガスバーナーを用いて各基材を100℃に加熱し、各基材について気温10℃における表面温度の減衰曲線を求めた(図7)。このグラフに基づき、予熱用ガスバーナー又は中赤外線炉と第1の火炎処理用ガスバーナーとの距離を求めた。
(i)予熱用ガスバーナーを用いた予熱方法
各種基材の予熱をFlynn Burner社(米国)製の製品名F-3000を用いて行い、このバーナーヘッドの炎口の態様はリボン式である。燃焼ガスとしてLPガスを用い、バーナーの炎口の幅10mm毎に、LPガス0.4L/分、クリーンドライエアー10L/分をガスミキサーで混合した後に、バーナーで燃焼させて予熱のための火炎処理を行った。バーナーの炎口と基材の距離は30mm、処理(搬送)速度は20m/分で予熱を行った。
本実施例では、中赤外線炉として株式会社グローバル製のFHD-601を用いた。板面風速を0.5m/秒とし、処理(搬送)速度20m/分で、赤外線ヒーターの出力を調整することにより、基材の表面温度を100℃として、昇温時間を3秒間とした。
上記の条件で予熱した各種基材をFlynn Burner社(米国)製の製品名F-3000を1又は2台用いて火炎処理を行った。バーナーヘッドの態様は全てリボン式である。処理条件はバーナーの炎口の幅10mmに対し、LPガス1.2L/分、クリーンドライエアー30L/分をガスミキサーで混合した後に、バーナーで燃焼させて火炎処理を行った。バーナーの炎口と基材の距離は30mm、処理(搬送)速度は20m/分で予熱を行った。1台目バーナーヘッドと2台目のバーナーヘッドの間隔は30cmとした。
なお、火炎処理時の基材表面の温度は熱電対温度計(Kタイプ)を用いた火炎処理直前(0.2秒前)の基材の温度である。
火炎処理を行って約2分後に活性光線硬化性インクジェットインキを用いてインクジェット印刷を行った。
活性硬化型インキとして、ラジカル重合型紫外線硬化性黒色インキ及びカチオン重合型紫外線硬化性黒色インキを用いた。各インキの具体的な組成は以下の通りである。
ラジカル重合型紫外線硬化性黒色インキを、以下の成分を混合することにより調製した。具体的なの組成は以下の通りである。
顔料分散液1)(顔料分:10質量%) 10質量部
反応性オリゴマー2) 25質量部
反応性オリゴマー3) 57質量部
光重合開始剤4) 5質量部
光重合開始剤5) 3質量部
2)CN985B88、2官能脂肪族ウレタンアクリレート88質量%、1,6-ヘキサンジオールジアクリレート12質量%の混合物 サートマージャパン(株)製
3)1,6-ヘキサンジオールジアクリレート
4)イルガキュア184、ヒドロキシケトン類 チバ・ジャパン(株)製
5)イルガキュア819、アシルフォスフィンオキサイド類 チバ・ジャパン(株)製
高分子分散剤(味の素ファインテクノ社製 PB821) 9質量部とオキセタン化合物(東亜合成社製 OXT211) 71質量部にブラック:Pigment Black 7を20質量部加えて、直径1mmのジルコニアビーズ200gと共にガラス瓶に入れて密栓し、ペイントシェーカーにて4時間分散処理した後、ジルコニアビーズを除去して、ブラックの顔料分散体を調整した。
上記分散体14質量部に、以下の光重合性化合物、塩基性化合物、界面活性剤、相溶化剤、光酸発生剤を混合して、カチオン重合型紫外線硬化性インクジェットインキを作製した。
(a)ノズル径 :35μm
(b)印加電圧 :11.5V
(c)パルス幅 :10.0μs
(d)駆動周波数 :3,483Hz
(e)解像度 :360dpi
(f)インキ液滴の体積 :42pl
(g)ヘッド加熱温度 :45℃
(h)インキ塗布量 :8.4g/m2
(i)ヘッドと記録面の距離 :5.0mm
(j)インキ滴の初速 :5.9m/sec
(a)ノズル径 :35μm
(b)印加電圧 :13.2V
(c)パルス幅 :10.0μs
(d)駆動周波数 :3,483Hz
(e)解像度 :360dpi
(f)インキ液滴の体積 :42pl
(g)ヘッド加熱温度 :45℃
(h)インキ塗布量 :8.4g/m2
(i)ヘッドと記録面の距離 :5.0mm
(j)インキ滴の初速 :6.1m/sec
(1)ランプの種類:高圧水銀ランプ(フュージョンUVシステムズ・ジャパン株式会社製 Hバルブ)
(2)ランプの出力:200W/cm
(3)積算光量:600mJ/cm2(オーク製作所製紫外線光量計UV-351-25を使用して測定)
各種基材の表面に紫外線硬化性インキで、解像度360dpiとなるように、100%(インキ塗布量:8.4g/m2)で印刷した。そして、印刷材に対して、JIS K5600-5-6 G 330(ISO 2409に対応)に準拠した碁盤目試験を実施した。具体的には、印刷材の表面に、1mm間隔で100個のマス目ができるように基盤目状の切り込みを入れ、当該部分にテープを貼り付けた。テープ剥離後、塗膜の残存率を観察した。塗膜の剥離面積が0%のものを「○」と評価し、剥離面積が0%超かつ20%以内であったものを「△」と評価し、剥離面積が20%を超えたものを「X」として評価した。また、△以上の評価を合格とした。
協和界面科学株式会社製ポータブル接触角計PCA-1を用いて、下記の条件で火炎処理後の基材の水接触角を測定した。
水接触角の測定条件
・液滴体積 : 1.0μl
・液滴着弾後から測定までの待ち時間 : 3秒
・水接触角の解析方法 : θ/2法
水接触角10度未満を「◎」、10~19度を「○」、20~29度を「△」、30度以上を「X」と評価した。また、△以上の評価を合格とした。
Claims (17)
- めっき鋼板、ステンレス鋼板、塗装鋼板、アルミニウム板、銅板および脱脂処理された普通鋼板から選択される、熱伝導率が10W/mK以上の金属系基材の表面に塗料又はインキで塗装又は印刷する前に、該基材を40℃以上に予熱した後、連続して、該基材表面を火炎処理することを含む、金属系基材表面を塗装又は印刷する前の処理方法。
- 前記基材が、めっき鋼板、ステンレス鋼板、塗装鋼板、アルミニウム板および銅板から選択される、請求項1に記載の処理方法。
- 前記火炎処理を1又は2以上のガスバーナーで行う、請求項1又は2に記載の処理方法。
- 前記火炎処理を2のガスバーナーで行う、請求項3に記載の処理方法。
- 前記火炎処理のガスバーナーがリボンバーナーである、請求項3又は4に記載の処理方法。
- 前記予熱を1のガスバーナーで行う、請求項1~5のいずれか1項に記載の処理方法。
- 予熱に用いるガスバーナーの出力が、火炎処理のガスバーナーの出力よりも低い、請求項6に記載の処理方法。
- 予熱に用いるガスバーナーの出力が、火炎処理のガスバーナーの出力の25~95%である、請求項7に記載の処理方法。
- 前記予熱をコンベア式の近赤外線炉又は中赤外線炉で行う、請求項1~5の何れか1項に記載の処理方法。
- 前記基材を50℃以上に予熱する、請求項1~9の何れか1項に記載の処理方法。
- 前記基材を60℃以上に予熱する、請求項1~9の何れか1項に記載の処理方法。
- 前記基材の温度が300℃を超えないように予熱する、請求項1~11の何れか1項に記載の処理方法。
- 前記基材が塗装鋼板である、請求項1~12の何れか1項に記載の処理方法。
- 前記塗装鋼板の表面に行う印刷が、インクジェット印刷である、請求項13に記載の処理方法。
- 前記インクジェット印刷を活性光線硬化型インキで行う、請求項14に記載の処理方法。
- 前記塗装鋼板は建築板の材料である、請求項13~15の何れか1項に記載の処理方法。
- 火炎処理で使用するガスバーナーの炎に由来する結露の発生が抑えられている、請求項1~16のいずれか1項に記載の処理方法。
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WO2019146473A1 (ja) * | 2018-01-26 | 2019-08-01 | 日新製鋼株式会社 | フレーム処理装置、塗装金属板の製造装置、および塗装金属板の製造方法 |
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CN115052752B (zh) * | 2020-02-26 | 2023-06-27 | 京瓷株式会社 | 光照射装置以及印刷装置 |
IT202100009581A1 (it) * | 2021-04-16 | 2022-10-16 | Cefla Soc Cooperativa | Apparato per la stampa digitale su un nastro continuo |
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EP3305421A4 (en) | 2019-01-16 |
US20180161809A1 (en) | 2018-06-14 |
KR20180033500A (ko) | 2018-04-03 |
RU2726636C2 (ru) | 2020-07-15 |
CN107683181B (zh) | 2021-04-06 |
CN107683181A (zh) | 2018-02-09 |
RU2017141568A (ru) | 2019-07-10 |
EP3305421A1 (en) | 2018-04-11 |
JP6088716B1 (ja) | 2017-03-01 |
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