WO2020004438A1 - Can manufacturing method - Google Patents

Can manufacturing method Download PDF

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Publication number
WO2020004438A1
WO2020004438A1 PCT/JP2019/025299 JP2019025299W WO2020004438A1 WO 2020004438 A1 WO2020004438 A1 WO 2020004438A1 JP 2019025299 W JP2019025299 W JP 2019025299W WO 2020004438 A1 WO2020004438 A1 WO 2020004438A1
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WO
WIPO (PCT)
Prior art keywords
printing
empty
layer
image
varnish layer
Prior art date
Application number
PCT/JP2019/025299
Other languages
French (fr)
Japanese (ja)
Inventor
宏紀 尾関
幸司 山田
Original Assignee
東洋製罐株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 東洋製罐株式会社 filed Critical 東洋製罐株式会社
Publication of WO2020004438A1 publication Critical patent/WO2020004438A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/08—Cylinders
    • B41F13/193—Transfer cylinders; Offset cylinders
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/08—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on filamentary or elongated articles, or on articles with cylindrical surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/24—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on flat surfaces of polyhedral articles
    • B41F17/26—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for for printing on flat surfaces of polyhedral articles by rolling contact
    • 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
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
    • B65D25/20—External fittings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D25/00—Details of other kinds or types of rigid or semi-rigid containers
    • B65D25/34—Coverings or external coatings

Definitions

  • the present invention relates to a method for producing a printed can.
  • the present inventors have studied to solve the above problems, and completed the present invention by performing image printing on a varnish layer of an empty can having a necked opening.
  • the present invention A printing method of printing an image on the varnish layer of an empty can having a varnish layer on the surface of the can and having a necked opening.
  • the necking process requires a varnish containing a wax component.
  • the varnish contains a large amount of the wax component, ink is repelled on the varnish surface, and it is difficult to perform printing as it is. Therefore, before the printing step, it is preferable to include a surface modification step of modifying at least a part of the surface of the varnish layer, and print an image on the surface-modified varnish layer.
  • the printing step is preferably a printing step by inkjet printing.
  • the present invention is an empty can having a necked opening, and on the surface of the empty can, a varnish layer containing a wax component and an inkjet image layer are laminated in this order. It is an empty can. It is preferable that a surface-modified layer in which the surface of the varnish layer is modified is provided between the varnish layer and the inkjet image layer.
  • the printing portion is wrinkled in the necking portion or the printed portion is peeled off due to printing before the necking process.
  • the present invention enables an image to be printed on the varnish layer of an empty can after necking, so that the degree of freedom in image printing in the can manufacturing process is improved.
  • FIG. 3A is a schematic top view of a print layer on the can surface of an empty can according to an embodiment
  • FIG. 4B is a schematic cross-sectional view of an AA ′ portion
  • FIG. 3A is a schematic top view of a print layer on the can surface of an empty can according to one embodiment
  • FIG. 4B is a schematic cross-sectional view of a BB ′ portion
  • FIG. 2A is a schematic top view of a print layer on the can surface of an empty can according to one embodiment
  • FIG. 2B is a schematic cross-sectional view taken along the line CC ′.
  • FIG. 1A is a schematic top view of a print layer on a can surface of an empty can according to an embodiment
  • FIG. 2B is a schematic cross-sectional view of a DD ′ portion.
  • FIG. 1 is a schematic diagram illustrating an example of a configuration of a printing system that performs a printing process.
  • One embodiment of the present invention is a method for manufacturing a can, including a printing step of printing an image on the varnish layer of an empty can having a varnish layer on the surface of the can and having a necked opening. .
  • a necking step of necking an opening is generally performed.
  • the necking process is not particularly limited, and a known method is applied.
  • a varnish layer is applied to the surface of the empty can in order to reduce friction during the process and improve the slipperiness.
  • an image is printed on the varnish layer on the surface of the empty can.
  • a surface modification step of modifying at least a part of the surface of the varnish layer before the printing step By printing an image on the surface-modified varnish layer, the adhesion between the varnish layer and the image printed on the varnish layer is improved. Further, in the present embodiment, steps other than the surface modification step and the printing step may be included as necessary.
  • It may include a sterilization treatment step of sterilizing the filling can, or an empty can or filling placed in a temporary storage place (ie, temporarily placed or temporarily stored) by a palletizer or the like.
  • a removing step of removing the can from the temporary storage location may be included.
  • a setting step of temporarily setting an empty can or a filling can printed after the printing step may be included. It goes without saying that steps other than the above-described steps may be included.
  • the surface modification step is a step of modifying the surface of the varnish layer of the empty can.
  • the method for the surface modification step is not particularly limited as long as the adhesion between the surface of the varnish layer of the empty can and the image can be improved.
  • a method of spraying a combustion flame containing a silicon compound on the surface of the varnish layer a method of plasma-treating the surface of the varnish layer; a method of corona-treating the surface of the varnish layer; A method of coating the surface of the varnish layer with an ink receiving layer for retaining the ink on the surface of the varnish layer.
  • a silicon oxide film By spraying a combustion flame containing a silicon compound, a silicon oxide film can be formed on the surface of the varnish layer.
  • the adhesion between the ink and the varnish layer can be improved in the subsequent image printing.
  • a known method disclosed in, for example, Japanese Patent No. 3626424 or Japanese Patent No. 4366220 can be used for spraying a combustion flame containing a silicon compound.
  • the silicon compound is not particularly limited, and typically includes a silane compound such as an alkylsilane or an alkoxysilane, but is not limited thereto. These silane compounds may have a halogen such as nitrogen or chlorine, a vinyl group, an amino group, or the like.
  • the upper limit of the boiling point of the silicon compound is usually 250 ° C or lower, 200 ° C or lower, 180 ° C or lower, and 150 ° C or lower. May be.
  • the lower limit is not particularly limited and is usually 20 ° C. or higher, and may be 50 ° C. or higher.
  • the temperature of the combustion flame is not particularly limited, and is usually 500 ° C or higher, may be 550 ° C or higher, and may be 600 ° C or higher.
  • the upper limit is usually 1500 ° C. or lower, 1250 ° C. or lower, or 1000 ° C. or lower.
  • the time for spraying the combustion flame is not particularly limited, but in this embodiment, it is preferable to perform the surface modification by short-time spraying in order to spray the combustion flame to the varnish layer.
  • the spraying of the combustion flame is preferably performed a plurality of times on the varnish layer on which the image is printed.
  • the blowing time of the combustion flame is preferably within 10 seconds with respect to the part to be sprayed, and may be within 5 seconds, may be within 3 seconds, may be within 2 seconds, It may be within one second.
  • the lower limit is not particularly limited as long as the surface modification is performed, but is usually 0.001 seconds or more.
  • Fuel gas is usually used to produce a combustion flame.
  • a flammable gas such as propane gas or natural gas is typically used as the fuel gas.
  • Hydrogen, oxygen, air and the like may be appropriately mixed and used with these combustible gases.
  • the amount of the silicon compound contained in the fuel gas is not particularly limited, but is usually 1.0 ⁇ 10 ⁇ 10 mol% or more, and may be 1.0 ⁇ 10 ⁇ 9 mol% or more based on the total amount of the fuel gas. , 1.0 ⁇ 10 ⁇ 8 mol% or more.
  • the upper limit is usually 10 mol% or less, may be 5 mol% or less, and may be 1 mol% or less.
  • FIG. 1 shows an example of a surface treatment apparatus for spraying a combustion flame used for surface modification.
  • the surface treatment apparatus 10 includes a device main body 6 having gas transfer units 61a and 61b and an injection port 62, and a silicon supply unit having a nozzle 21 for supplying a silicon compound to the device main body 6, and a tank 22 for storing the silicon compound. 2 and a gas supply unit (not shown) for supplying gas to the gas transfer units 61a and 61b of the apparatus main body 6.
  • a combustion gas such as natural gas is supplied to the gas transfer unit 61a from a gas supply unit.
  • Air 4 is supplied as a carrier gas from the gas supply unit to the gas transfer unit 61b.
  • the gas transferred by the transfer units 61a and 61b is mixed with the silicon compound supplied from the silicon supply unit 2, and is injected from the injection port 62.
  • the mixed gas is ignited by a separately provided ignition means, becomes a combustion flame 5, and is injected onto the surface of the empty can 1.
  • the combustion flame 5 having the injected silicon compound forms a silicon oxide film on the surface of the empty can 1.
  • the distance between the injection port 62 of the surface treatment device 10 and the surface of the empty can 1 is not particularly limited, but is usually 1 cm or more, may be 3 cm or more, and may be 5 cm or more. Further, it is usually 30 cm or less, may be 20 cm or less, and may be 15 cm or less.
  • the varnish layer on the surface of the empty can is subjected to surface modification.
  • the empty can is not particularly limited, and typically includes an empty can for filling a food or beverage, but is not particularly limited thereto.
  • the method of making empty cans is not particularly limited, and known methods can be applied.
  • drawing, redrawing, and ironing can be mentioned.
  • a tin plate cutting step, a roll forming, a can body welding step, and a can body stretch forming can be mentioned.
  • Other examples include paneling molding for forming a can body into a deformed can having an elliptical, square, or embossed shape, molding a flange portion for winding a can lid, and necking molding.
  • the formed empty can is subjected to necking at the opening.
  • At least a part of the surface of the formed empty can, particularly the surface of the can body, may be printed separately from the image printing described above.
  • the printing method is not particularly limited, but offset printing is a typical printing method for cans.
  • the printing step may be performed on a molded empty can, or may be performed at a plate-like stage before molding.
  • a known method is applied to offset printing on a seamless can. For example, a method of transferring ink to a blanket and continuously performing offset printing on the surface of the seamless can can be applied.
  • the image is printed on the varnish layer.
  • the portion where the image is printed may not be printed at all. That is, a part of the surface of the formed empty can may be printed, or may have an unprinted portion, or may not be printed at all.
  • at least a part of the printing on the surface of the empty can may be solid-painted, for example, solid-painted on a white background.
  • the printing method of the solid coating is not limited to the offset printing, and may be performed by a white coater. The solid color is not particularly limited. Further, the printing step of the solid coating may be performed at any time after the varnish layer is formed on the surface of the empty can until the image is printed on the varnish layer.
  • the empty can pre-printed as necessary before image printing, is filled with food, beverages and other contents after the image is printed on the varnish layer of the empty can, and the contents are filled and sealed. It becomes a filled can.
  • the filled can after filling and sealing is further coated with a varnish containing wax on the surface of the can.
  • the printing step is a step of printing an image on a varnish layer of an empty can having an opening subjected to necking.
  • the image is an inkjet image.
  • the method of image printing is not particularly limited, and a known method is applied.
  • a method of directly printing ink on an empty can by inkjet printing, or a method of forming an image on a transfer medium once and then transferring the image to the empty can may be used.
  • a known method may be applied as a method of directly printing ink on an empty can by inkjet printing. Ink jet printing enables pattern printing, photo printing, image printing, and the like, and the design of the empty can surface is significantly improved.
  • the adhesion between the varnish layer and the image is improved by performing the surface modification of the varnish layer.
  • the surface modification is performed by spraying a combustion flame containing a silicon compound on the varnish layer, the ink can be spread well on the silicon oxide film, so that the base of the empty can is not transparent. It should be noted that a similar effect can be realized by screen printing or hot stamping as printing other than ink jet printing.
  • Another embodiment of the present invention is a can manufactured by the above manufacturing method, and has the following configuration. That is, it is an empty can that has been subjected to necking processing, in which a varnish layer containing a wax component and an inkjet image layer are laminated in this order on the surface of the empty can. And it is preferable that the surface of the varnish layer is modified between the varnish layer and the inkjet image layer.
  • the surface-modified layer means a varnish layer surface or the like modified by a plasma treatment, a corona treatment, or the like, in addition to a layer having a thickness such as a silicon oxide film and an ink receiving layer.
  • the can manufactured by the above manufacturing method is an empty can subjected to necking, and a solid printing layer, a varnish layer, a silicon oxide film, and an inkjet image printing layer are formed in this order on the surface of the empty can. It can be an empty can.
  • FIG. 2 is a schematic top view (a) showing a printed layer printed on the surface of an empty can developed on a plane and viewed from the top, and a schematic sectional view (b) of an AA ′ portion.
  • the developed print layer 100 has a first print unit 101 and a second print unit 102, and the first print unit 101 has an image printed by plate printing.
  • the second printing unit 102 has an inkjet image printed by inkjet printing.
  • the remaining second printing unit 102 is inkjet-printed, thereby forming a printing layer on the surface of the empty can.
  • the cross-sectional view differs between the first printing unit 101 and the second printing unit 102 as shown in FIG.
  • the first printing unit 101 is formed by laminating an image printing layer 104 and a varnish layer 105 on an empty can surface 103 in this order.
  • the second printing unit 102 has a varnish layer 105, a silicon oxide film 106, and an ink-jet image printing layer 107 laminated on the empty can surface 103 in this order. With such a configuration, it is possible to print a high-definition inkjet image printing layer only on a necessary portion.
  • FIG. 3 is a schematic top view (a) showing a print layer printed on the surface of an empty can developed on a plane and viewed from the top, and a schematic sectional view (b) of a BB ′ portion.
  • the developed print layer 200 has a first print unit 201 and a second print unit 202, and the first print unit 201 has an image printed by plate printing.
  • the second printing unit 202 has an inkjet image printed by inkjet printing.
  • a design image 204 is printed on the entire surface of the can, and a varnish is applied, that is, the design print can on which the design image is printed is subjected to surface treatment on a portion corresponding to the second printing unit 202, After that, a printing layer is formed by inkjet image printing.
  • the first printing unit 201 includes an empty can surface 203 and an image printing layer 204 and a varnish layer 205 laminated in this order.
  • the second printing section 202 has an image printing layer 204, a varnish layer 205, a silicon oxide film 206, a solid printing layer 208, and an ink jet image printing layer 207 laminated in this order on an empty can surface 203. According to such an embodiment, it is possible to print a high-definition inkjet image printing layer only on a necessary portion.
  • FIG. 4 is a schematic top view (a) showing a printed layer printed on the surface of another form of an empty can developed on a plane and viewed from the top, and a schematic cross-sectional view of a CC ′ portion (b). It is.
  • the developed print layer 300 has an entire surface inkjet image printed by inkjet printing.
  • a solid printing layer 304, a varnish layer 305, a silicon oxide film 306, and an inkjet image printing layer 307 are laminated on the empty can surface 303 in this order.
  • the solid printing layer 304 may be a white coating layer, or may be another single-color solid image. Due to the presence of the silicon oxide film 306, the inkjet image printing layer 307 has sufficient adhesion even on the varnish 305 having insufficient ink adhesion.
  • FIG. 5 illustrates another embodiment.
  • FIG. 5 is a schematic top view (a) showing a printed layer printed on the surface of another form of an empty can developed from above and shown from the top, and a schematic cross-sectional view of the DD ′ portion (b). It is.
  • the developed print layer 400 has an entire surface inkjet image printed by inkjet printing.
  • the varnish layer 405 is laminated on the empty can surface 403. That is, a silicon oxide film 406 is formed on the surface of an empty can where only a varnish is applied, and a solid print layer 404 and an ink jet image print layer 407 are laminated on the silicon oxide film 406 in this order.
  • a filling and sealing step of filling the contents into an empty can having an image printed on the varnish layer may be provided.
  • the filling / sealing step is a step of filling and sealing the contents in an empty can having an opening subjected to necking.
  • the filling and sealing step is not particularly limited as long as the contents can be filled and sealed in an empty can, and can be appropriately performed according to the type of the contents and the type of the empty can.
  • FIG. 6 is a schematic diagram illustrating an example of the configuration of the printing system I-100.
  • the printing system I-100 includes a printing station I-10 serving as an image forming unit, a transfer belt I-20 serving as an image transfer unit, a transfer station I-30 serving as a transfer unit, and a mandrel wheel I-40 serving as a can transfer unit.
  • a mandrel I-42, a washing station I-50 as a washing means, and an overcoat station I-60 as a coating means are provided.
  • the printing system I-100 may have a configuration other than these.
  • the printing station I-10 includes a printing unit I-11, and an inkjet image I-14 is formed on a blanket I-23 included in the transport belt I-20 by an inkjet printer head included in the printing unit I-11.
  • the printing unit I-11 may have only one printing unit I-10, or a plurality of printing units I-11. By having a plurality of printing units I-11, it is possible to cope with high-speed printing, and it is also possible to cope with a printing method having a large number of passes.
  • I-14 can be formed on blanket I-23.
  • the ink jet printer head included in the printing unit I-11 typically includes a plurality of nozzles that eject ink of each color of white (W), black (K), yellow (Y), magenta (M), and cyan (C).
  • a head I-12 is included.
  • the order of the colors is not particularly limited, and the colors of the inks are not limited to these. Therefore, clear ink may be used.
  • the printing unit I-11 may include a nozzle bed for forming a primer layer (Pr). In that case, by providing a nozzle head for forming a primer layer (Pr) downstream of the inkjet printer head, the formed inkjet image I-14 can be covered with the primer layer.
  • the printing unit I-11 may further include a UV irradiation unit I-13 as a curing unit.
  • the ink ejected from the inkjet printer head is a UV curable ink
  • a drying unit may be provided as a curing unit instead of the UV irradiation unit I-13.
  • the drying unit can semi-cure the inkjet image I-14 by, for example, blowing hot air onto the inkjet image I-14.
  • the curing of the inkjet image by heat may include curing the thermosetting resin contained in the ink with heat, curing the ink by blowing off the solvent contained in the ink with heat, and the like.
  • the transport belt I-20 is formed in an annular shape through a first roller I-21 and a second roller I-22, and rotates around in a direction indicated by an arrow in FIG. Is transported to the transfer station I-30.
  • the number of the blankets I-23 of the transport belt I-20 can be appropriately determined according to the circumference of the annular transport belt I-20 and according to the operating speed of the printing system.
  • the transport belt I-20 may have flexibility, but if the material is excessively flexible, the belt may be insufficiently tensioned, causing a shift during printing or transfer.
  • the material of the transport belt I-20 is not particularly limited.
  • one or more auxiliary rollers may be provided in addition to the first roller I-21 and the second roller I-22.
  • the blanket I-23 on which the inkjet image I-14 has been formed is conveyed to the transfer station I-30 along the outer periphery of the first roller I-21.
  • a plurality of cans I-41 are transported to the transfer station I-30 by the mandrel wheel I-40.
  • the can I-41 starts rotating, or immediately before the leading end of the blanket I-23 comes into contact with the can I-41.
  • -41 starts rotating, and after contact, the ink jet image I-14 formed on the blanket I-23 is transferred in the circumferential direction of the can I-41, and the ink jet image I-14 is formed on the surface of the can I-41. It is formed.
  • the blanket I-23 and the can I-41 may be properly positioned, and the positioning may be performed by a known method.
  • the rotation of the mandrel wheel I-40 itself is stopped, and the rotation of the mandrel I-42 is stopped with the mandrel wheel I-40 stopped.
  • the can I-41 may be rotated, and the ink jet image I-14 formed on the blanket I-23 may be transferred to the can I-41.
  • the present embodiment can be applied to such intermittent printing.
  • the surface of the blanket I-23 may be cleaned at the cleaning station I-50.
  • the ink jet image I-14 can suppress the remaining ink on the blanket I-23 due to the presence of the connecting member.
  • a cleaning station I-50 may be provided to clean the ink on the blanket I-23.
  • the cleaning station I-50 typically includes a cleaning agent supply unit I-51 that discharges the cleaning agent onto the blanket I-23, and a scraper I-52 that wipes off residual ink on the blanket I-23. .
  • the blanket I-23, the surface of which has been cleaned at the cleaning station I-50, is guided by the second roller I-22 and transported again to the printing station I-10, where the inkjet image I-14 is formed.
  • the can I-41 to which the inkjet image I-14 has been transferred is transported to the overcoat station I-60 by the mandrel wheel I-40.
  • the overcoat station I-60 At the overcoat station I-60, the ink jet image I-14 transferred onto the surface of the can I-41 is coated.
  • a varnish is typically used for the coating, but other varnishes may be used as long as they can protect the inkjet image and improve the durability.
  • a surface modifying means for modifying the surface of the can surface may be provided in the printing system I-100.
  • a surface modifying means may be provided upstream of the transfer station of the can conveying means. It goes without saying that pre-printing of empty cans may be performed using the printing system I-100 shown in FIG.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Ink Jet (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The present invention addresses problems that occur when an image is printed prior to a necking process, namely the problem that the printed part of the part that has been subjected to the necking process becomes wrinkled, and the problem that the printed part peels off. These problems are resolved by printing the image on a varnish layer of an empty can which has said varnish layer on the surface of the can, and which has a necked opening portion.

Description

缶の製造方法Can manufacturing method
　本発明は、印刷を施した缶の製造方法に関する。 The present invention relates to a method for producing a printed can.
　飲料缶では原料金属の使用量を削減するなどの目的で端部にネッキング加工が施される。ネッキング加工の方法は、様々提案されている（例えば特許文献１等）。 In beverage cans, the ends are necked to reduce the amount of raw metal used. Various necking methods have been proposed (for example, Patent Document 1).
特開２００８－１３２５２２号公報JP 2008-132522 A
　通常、空缶へ印刷を施す場合、ネッキング加工後ではネッキング部にオフセット印刷を施すことが一般的に困難であることから、ネッキング加工前に印刷を行っている。また、ネッキング加工に先立って、加工時の摩擦の低減や滑り性を良くするため、空缶の表面にニス層が形成される。
　しかし、ネッキング加工前に印刷を行うと、ネッキング加工時にネッキング加工部分において印刷部分がシワになったり、剥がれたりする恐れがあった。また、ニス層はインクを弾きやすいため、ニス層が形成された後の印刷、特に画像などの印刷は避けられる傾向にあった。
　本発明はこのような課題を解決するものである。 Usually, when printing on an empty can, it is generally difficult to perform offset printing on the necking portion after the necking process, so printing is performed before the necking process. Prior to necking, a varnish layer is formed on the surface of the empty can in order to reduce friction during processing and improve slipperiness.
However, if printing is performed before the necking process, the printed portion may be wrinkled or peeled off at the necking portion during the necking process. Further, since the varnish layer is easy to repel ink, printing after the varnish layer is formed, particularly printing of an image or the like, tends to be avoided.
The present invention solves such a problem.
　本発明者らは、上記課題を解決すべく検討し、ネッキング加工された開口部を有する空缶のニス層上に画像印刷を施すことで、本発明を完成させた。 The present inventors have studied to solve the above problems, and completed the present invention by performing image printing on a varnish layer of an empty can having a necked opening.
　すなわち本発明は、
　缶表面にニス層を有し、且つネッキング加工された開口部を有する空缶の、前記ニス層上に画像を印刷する印刷工程、を含む、缶の製造方法、を含む。 That is, the present invention
A printing method of printing an image on the varnish layer of an empty can having a varnish layer on the surface of the can and having a necked opening.
　また、ネッキング加工には、ワックス成分を含むニスが必要となるところ、ニスにワックス成分が多く含まれることで、ニス表面でインクが弾かれて、そのまま印刷を行うことが困難であった。そのため、前記印刷工程前に、前記ニス層の表面の少なくとも一部を改質する表面改質工程を含み、前記表面改質されたニス層上に画像を印刷することが好ましい。
　また、前記印刷工程は、インクジェット印刷による印刷工程であることが好ましい。 In addition, the necking process requires a varnish containing a wax component. However, since the varnish contains a large amount of the wax component, ink is repelled on the varnish surface, and it is difficult to perform printing as it is. Therefore, before the printing step, it is preferable to include a surface modification step of modifying at least a part of the surface of the varnish layer, and print an image on the surface-modified varnish layer.
Further, the printing step is preferably a printing step by inkjet printing.
　また、本発明は別の側面として、ネッキング加工された開口部を有する空缶であって、空缶表面上に、ワックス成分を含むニス層と、インクジェット画像層と、がこの順に積層された、空缶である。前記ニス層と前記インクジェット画像層との間に、前記ニス層の表面が改質された表面改質層を含むことが好ましい。 Further, as another aspect, the present invention is an empty can having a necked opening, and on the surface of the empty can, a varnish layer containing a wax component and an inkjet image layer are laminated in this order. It is an empty can. It is preferable that a surface-modified layer in which the surface of the varnish layer is modified is provided between the varnish layer and the inkjet image layer.
　本発明により、ネッキング加工後の空缶のニス層上に画像を印刷することで、ネッキング加工前に印刷することで生じる、ネッキング加工部分において印刷部分がシワになる問題や印刷部分が剥がれたりする問題を解決できる。
　更には、本発明によりネッキング加工後の空缶のニス層上に画像を印刷することが可能となることから、製缶の工程における画像印刷の時期的自由度が向上する。 According to the present invention, by printing an image on the varnish layer of the empty can after the necking process, the printing portion is wrinkled in the necking portion or the printed portion is peeled off due to printing before the necking process. Can solve the problem.
Furthermore, the present invention enables an image to be printed on the varnish layer of an empty can after necking, so that the degree of freedom in image printing in the can manufacturing process is improved.
表面改質処理を行う表面処理装置の一形態を示す模式図である。It is a schematic diagram which shows one form of the surface treatment apparatus which performs a surface modification process. 一実施形態である空缶の、缶表面の印刷層の上面模式図（ａ）と、Ａ－Ａ´部の断面模式図（ｂ）である。FIG. 3A is a schematic top view of a print layer on the can surface of an empty can according to an embodiment, and FIG. 4B is a schematic cross-sectional view of an AA ′ portion. 一実施形態である空缶の、缶表面の印刷層の上面模式図（ａ）と、Ｂ－Ｂ´部の断面模式図（ｂ）である。FIG. 3A is a schematic top view of a print layer on the can surface of an empty can according to one embodiment, and FIG. 4B is a schematic cross-sectional view of a BB ′ portion. 一実施形態である空缶の、缶表面の印刷層の上面模式図（ａ）と、Ｃ－Ｃ´部の断面模式図（ｂ）である。FIG. 2A is a schematic top view of a print layer on the can surface of an empty can according to one embodiment, and FIG. 2B is a schematic cross-sectional view taken along the line CC ′. 一実施形態である空缶の、缶表面の印刷層の上面模式図（ａ）と、Ｄ－Ｄ´部の断面模式図（ｂ）である。1A is a schematic top view of a print layer on a can surface of an empty can according to an embodiment, and FIG. 2B is a schematic cross-sectional view of a DD ′ portion. 印刷工程を実施する印刷システムの構成の一例を示す概略図である。FIG. 1 is a schematic diagram illustrating an example of a configuration of a printing system that performs a printing process.
　本発明の一実施形態は缶の製造方法であり、缶表面にニス層を有し、且つネッキング加工された開口部を有する空缶の、前記ニス層上に画像を印刷する印刷工程、を含む。
　製缶の工程において、一般的に、開口部にネッキング加工するネッキング工程が行われる。本実施形態においてネッキング加工は特段限定されず、既知の方法が適用される。ネッキング加工の際には、ネッキング加工に先立って、加工時の摩擦を低減したり、滑り性を良くするため、空缶の表面にニス層が施される。本実施形態の印刷工程では、空缶表面の該ニス層上に画像を印刷する。 One embodiment of the present invention is a method for manufacturing a can, including a printing step of printing an image on the varnish layer of an empty can having a varnish layer on the surface of the can and having a necked opening. .
In the process of making a can, a necking step of necking an opening is generally performed. In the present embodiment, the necking process is not particularly limited, and a known method is applied. Prior to the necking process, a varnish layer is applied to the surface of the empty can in order to reduce friction during the process and improve the slipperiness. In the printing step of the present embodiment, an image is printed on the varnish layer on the surface of the empty can.
　本実施形態では、印刷工程前に、前記ニス層の表面の少なくとも一部を改質する表面改質工程を含むことが好ましい。表面改質されたニス層上に画像を印刷することで、ニス層とニス層上に印刷された画像との密着性が向上する。
　また、本実施形態では、上記表面改質工程及び印刷工程以外の工程を、必要に応じて含んでもよい。ネッキング加工された開口部を有する空缶またはネッキング後に表面改質されたニス層を有する空缶に内容物を充填して密封する充填密封工程や、充填密封後に、レトルト、パスト、高圧殺菌など、充填缶に殺菌処理をする殺菌処理工程を含んでもよいし、パレタイザーなどによる一時裁置（すなわち、一時的に置かれた、又は一時的に保管された）場所に裁置された空缶や充填缶を、一時裁置場所から取り出す取り出し工程を含んでもよい。さらに、印刷工程後に印刷された空缶や充填缶を一時裁置する裁置工程を含んでもよい。なお、前記記載の工程以外の工程を含んでもよいことは言うまでも無い。 In this embodiment, it is preferable to include a surface modification step of modifying at least a part of the surface of the varnish layer before the printing step. By printing an image on the surface-modified varnish layer, the adhesion between the varnish layer and the image printed on the varnish layer is improved.
Further, in the present embodiment, steps other than the surface modification step and the printing step may be included as necessary. A filling and sealing step of filling and sealing the contents in a can having an necked opening or a can having a varnish layer surface-modified after necking, and after filling and sealing, retort, paste, high-pressure sterilization, etc. It may include a sterilization treatment step of sterilizing the filling can, or an empty can or filling placed in a temporary storage place (ie, temporarily placed or temporarily stored) by a palletizer or the like. A removing step of removing the can from the temporary storage location may be included. Further, a setting step of temporarily setting an empty can or a filling can printed after the printing step may be included. It goes without saying that steps other than the above-described steps may be included.
＜表面改質工程＞
　表面改質工程は、空缶のニス層表面に対し、その表面を改質する工程である。表面改質工程は、空缶のニス層表面と、画像との密着性を改善できれば特段その方法は限定されない。例えば、ニス層表面にケイ素化合物を含む燃焼炎を吹き付ける方法；ニス層表面をプラズマ処理する方法；ニス層表面をコロナ処理する方法；ニス層表面に塗布するニスとしてインク密着性を向上させたニスを用いる方法；ニス層表面にインクを留まらせるインク受容層でニス層表面を被覆する方法；などが挙げられる。
　このうち、ケイ素化合物を含む燃焼炎を吹き付けることで表面改質することが好ましい。ケイ素化合物を含む燃焼炎を吹き付けることで、ニス層表面上に酸化ケイ素被膜を形成することができる。ニス層表面に該酸化ケイ素被膜を形成することで、その後に行われる画像印刷において、インクとニス層との密着性を改善することができる。 <Surface modification process>
The surface modification step is a step of modifying the surface of the varnish layer of the empty can. The method for the surface modification step is not particularly limited as long as the adhesion between the surface of the varnish layer of the empty can and the image can be improved. For example, a method of spraying a combustion flame containing a silicon compound on the surface of the varnish layer; a method of plasma-treating the surface of the varnish layer; a method of corona-treating the surface of the varnish layer; A method of coating the surface of the varnish layer with an ink receiving layer for retaining the ink on the surface of the varnish layer.
Of these, it is preferable to perform surface modification by spraying a combustion flame containing a silicon compound. By spraying a combustion flame containing a silicon compound, a silicon oxide film can be formed on the surface of the varnish layer. By forming the silicon oxide film on the surface of the varnish layer, the adhesion between the ink and the varnish layer can be improved in the subsequent image printing.
　ケイ素化合物を含む燃焼炎の吹付けは、例えば特許第３６２６４２４号や特許第４３６６２２０号などに開示された、既知の方法を用いることができる。
　ケイ素化合物は特に限定されず、典型的にはアルキルシランやアルコキシシラン等のシラン化合物が挙げられるが、これらに限られない。これらのシラン化合物は、窒素、塩素等のハロゲン、ビニル基、アミノ基等を有してもよい。
　ニス層表面上に良好な酸化ケイ素被膜を形成する観点から、ケイ素化合物の沸点の上限は通常２５０℃以下であり、２００℃以下であってよく、１８０℃以下であってよく、１５０℃以下であってよい。下限は特段限定されず、通常２０℃以上であり、５０℃以上であってよい。 A known method disclosed in, for example, Japanese Patent No. 3626424 or Japanese Patent No. 4366220 can be used for spraying a combustion flame containing a silicon compound.
The silicon compound is not particularly limited, and typically includes a silane compound such as an alkylsilane or an alkoxysilane, but is not limited thereto. These silane compounds may have a halogen such as nitrogen or chlorine, a vinyl group, an amino group, or the like.
From the viewpoint of forming a good silicon oxide film on the surface of the varnish layer, the upper limit of the boiling point of the silicon compound is usually 250 ° C or lower, 200 ° C or lower, 180 ° C or lower, and 150 ° C or lower. May be. The lower limit is not particularly limited and is usually 20 ° C. or higher, and may be 50 ° C. or higher.
　燃焼炎の温度は特段限定されるものではなく、通常５００℃以上であり、５５０℃以上であってよく、６００℃以上であってよい。また上限は、通常１５００℃以下であり、１２５０℃以下であってよく、１０００℃以下であってよい。 The temperature of the combustion flame is not particularly limited, and is usually 500 ° C or higher, may be 550 ° C or higher, and may be 600 ° C or higher. The upper limit is usually 1500 ° C. or lower, 1250 ° C. or lower, or 1000 ° C. or lower.
　燃焼炎の吹き付け時間は特段限定されるものではないが、本実施形態ではニス層に対し燃焼炎を吹き付けるため、短時間の吹き付けによる表面改質を行うことが好ましい。燃焼炎の吹き付けは、画像印刷がされるニス層に複数回行うことが好ましい。本実施形態では燃焼炎の吹き付け時間が、吹き付けられる一部分に対して１０秒以内であることが好ましく、５秒以内であってよく、３秒以内であってよく、２秒以内であってよく、１秒以内であってよい。下限は表面改質が行われる限り特段限定されないが、通常は０．００１秒以上である。 The time for spraying the combustion flame is not particularly limited, but in this embodiment, it is preferable to perform the surface modification by short-time spraying in order to spray the combustion flame to the varnish layer. The spraying of the combustion flame is preferably performed a plurality of times on the varnish layer on which the image is printed. In this embodiment, the blowing time of the combustion flame is preferably within 10 seconds with respect to the part to be sprayed, and may be within 5 seconds, may be within 3 seconds, may be within 2 seconds, It may be within one second. The lower limit is not particularly limited as long as the surface modification is performed, but is usually 0.001 seconds or more.
　燃焼炎とするためには、通常燃料ガスが用いられる。燃料ガスとしては、プロパンガスや天然ガスなどの可燃性ガスが典型的には用いられる。これらの可燃性ガスに適宜、水素、酸素、空気等を混合して用いてもよい。 (4) Fuel gas is usually used to produce a combustion flame. A flammable gas such as propane gas or natural gas is typically used as the fuel gas. Hydrogen, oxygen, air and the like may be appropriately mixed and used with these combustible gases.
　燃料ガス中に含有させるケイ素化合物の量は特段限定されないが、燃料ガス全量に対し、通常１．０×１０－１０モル％以上であり、１．０×１０－９モル％以上であってよく、１．０×１０－８モル％以上であってよい。上限は通常１０モル％以下であり、５モル％以下であってよく、１モル％以下であってよい。 The amount of the silicon compound contained in the fuel gas is not particularly limited, but is usually 1.0 × 10 −10 mol% or more, and may be 1.0 × 10 −9 mol% or more based on the total amount of the fuel gas. , 1.0 × 10 −8 mol% or more. The upper limit is usually 10 mol% or less, may be 5 mol% or less, and may be 1 mol% or less.
　表面改質に用いられる燃焼炎を吹き付けるための表面処理装置の一例を図１に示す。
　表面処理装置１０は、ガス移送部６１ａ及び６１ｂと噴射口６２とを有する装置本体６と、装置本体６にケイ素化合物を供給する、ノズル２１とケイ素化合物を貯蔵するタンク２２とを有するケイ素供給部２と、装置本体６のガス移送部６１ａ、６１ｂにガスを供給するガス供給部（図示せず）と、を備える。 FIG. 1 shows an example of a surface treatment apparatus for spraying a combustion flame used for surface modification.
The surface treatment apparatus 10 includes a device main body 6 having gas transfer units 61a and 61b and an injection port 62, and a silicon supply unit having a nozzle 21 for supplying a silicon compound to the device main body 6, and a tank 22 for storing the silicon compound. 2 and a gas supply unit (not shown) for supplying gas to the gas transfer units 61a and 61b of the apparatus main body 6.
　ガス移送部６１ａにはガス供給部から天然ガスなどの燃焼ガスが供給される。ガス移送部６１ｂには、ガス供給部からキャリアガスとして空気４が供給される。移送部６１ａ、６１ｂにより移送されたガスは、ケイ素供給部２から供給されたケイ素化合物と混合され、噴射口６２から噴射される。ここで混合ガスは、別途設けられた着火手段により着火され、燃焼炎５となり、空缶１の表面に噴射される。噴射されたケイ素化合物を有する燃焼炎５は、空缶１の表面に酸化ケイ素被膜を形成する。
　表面処理装置１０の噴射口６２と、空缶１表面との距離は特段限定されないが、通常１ｃｍ以上であり、３ｃｍ以上であってよく、５ｃｍ以上であってよい。また通常３０ｃｍ以下であり、２０ｃｍ以下であってよく、１５ｃｍ以下であってよい。 A combustion gas such as natural gas is supplied to the gas transfer unit 61a from a gas supply unit. Air 4 is supplied as a carrier gas from the gas supply unit to the gas transfer unit 61b. The gas transferred by the transfer units 61a and 61b is mixed with the silicon compound supplied from the silicon supply unit 2, and is injected from the injection port 62. Here, the mixed gas is ignited by a separately provided ignition means, becomes a combustion flame 5, and is injected onto the surface of the empty can 1. The combustion flame 5 having the injected silicon compound forms a silicon oxide film on the surface of the empty can 1.
The distance between the injection port 62 of the surface treatment device 10 and the surface of the empty can 1 is not particularly limited, but is usually 1 cm or more, may be 3 cm or more, and may be 5 cm or more. Further, it is usually 30 cm or less, may be 20 cm or less, and may be 15 cm or less.
　表面改質工程は、空缶表面のニス層に対し、表面改質を行う。空缶は特段限定されず、典型的には食品や飲料を充填するための空缶が挙げられるが、特にこれに限定されない。 In the surface modification step, the varnish layer on the surface of the empty can is subjected to surface modification. The empty can is not particularly limited, and typically includes an empty can for filling a food or beverage, but is not particularly limited thereto.
　空缶の製缶の方法は特段限定されず、既知の方法を適用することができる。例えば２ピース缶の製缶方法では、絞り成形、再絞り成形、しごき成形が挙げられる。３ピース缶の製缶方法では、ブリキ板切断工程、ロール成形、缶胴溶接工程、缶胴ストレッチ成形が挙げられる。その他、缶胴を楕円形、角型、エンボス形状などの異形缶にするためのパネリング成形や、缶蓋を巻締するためのフランジ部成形、さらにネッキング成形などが挙げられる。成形した空缶は、すでに説明したとおり、開口部にネッキング加工が施される。 方法 The method of making empty cans is not particularly limited, and known methods can be applied. For example, in the method of making two-piece cans, drawing, redrawing, and ironing can be mentioned. In the method of making a three-piece can, a tin plate cutting step, a roll forming, a can body welding step, and a can body stretch forming can be mentioned. Other examples include paneling molding for forming a can body into a deformed can having an elliptical, square, or embossed shape, molding a flange portion for winding a can lid, and necking molding. As described above, the formed empty can is subjected to necking at the opening.
　成形した空缶の表面、特に缶胴の表面は、上記説明した画像印刷とは別に、少なくともその一部が印刷されていてもよい。印刷方法は特に限定されないが、一般的な缶の印刷方法としてオフセット印刷が挙げられる。印刷工程は、成形した空缶へ印刷してもよいし、成形する前の板状の段階で行ってもよい。シームレス缶へのオフセット印刷は既知の方法が適用され、例えばインクをブランケットに転写し、連続してシームレス缶表面にオフセット印刷する方法などを適用できる。 表面 At least a part of the surface of the formed empty can, particularly the surface of the can body, may be printed separately from the image printing described above. The printing method is not particularly limited, but offset printing is a typical printing method for cans. The printing step may be performed on a molded empty can, or may be performed at a plate-like stage before molding. A known method is applied to offset printing on a seamless can. For example, a method of transferring ink to a blanket and continuously performing offset printing on the surface of the seamless can can be applied.
　本実施形態では、ネッキング加工後、ニス層上に画像印刷を施すものであるが、当該画像印刷を行う箇所は、何ら印刷されていなくてもよい。即ち、成形した空缶の表面の一部に印刷がされていてもよいし、印刷されていない箇所を有してもよく、全く印刷されていなくてもよい。また同様に、画像印刷の画像を目立たせるために、空缶表面の少なくとも一部の印刷がベタ塗り、例えば白地のベタ塗りであってもよい。ただし、ベタ塗りの印刷方法はオフセット印刷に限定されるものではなく、ホワイトコーターで行ってもよい。また、ベタ塗りの色は特に限定されない。さらに、ベタ塗りの印刷工程は、空缶の表面にニス層が形成されてから、ニス層上に画像印刷がされるまでの間、いつの時点で行ってもよい。 In the present embodiment, after the necking process, the image is printed on the varnish layer. However, the portion where the image is printed may not be printed at all. That is, a part of the surface of the formed empty can may be printed, or may have an unprinted portion, or may not be printed at all. Similarly, in order to make the image of the image printing stand out, at least a part of the printing on the surface of the empty can may be solid-painted, for example, solid-painted on a white background. However, the printing method of the solid coating is not limited to the offset printing, and may be performed by a white coater. The solid color is not particularly limited. Further, the printing step of the solid coating may be performed at any time after the varnish layer is formed on the surface of the empty can until the image is printed on the varnish layer.
　このように画像印刷の前に必要に応じ前印刷された空缶は、空缶のニス層上に画像印刷がされた後、食料、飲料などの内容物が充填密封され、内容物が充填密封された充填缶となる。なお、充填密封後の充填缶は、更に缶表面にワックスを含むニスが塗布されていることが多い。 In this way, the empty can, pre-printed as necessary before image printing, is filled with food, beverages and other contents after the image is printed on the varnish layer of the empty can, and the contents are filled and sealed. It becomes a filled can. In many cases, the filled can after filling and sealing is further coated with a varnish containing wax on the surface of the can.
＜印刷工程＞
　印刷工程は、開口部にネッキング加工が施された空缶のニス層上に画像を印刷する工程である。画像は、インクジェット画像であることが好ましい。画像印刷の方法は特段限定されず、既知の方法が適用される。例えば、インクジェット印刷によりインクを空缶へ直接印刷する方法でもよいし、一度転写媒体へ画像を形成してからその画像を空缶へ転写する方法でもよい。インクジェット印刷によりインクを空缶へ直接印刷する方法は、公知の方法を適用すればよい。インクジェット印刷により、模様印刷、写真印刷、画像印刷などが可能となり、空缶表面のデザイン性が格段に向上する。また、本実施形態では、ニス層の表面改質を行うことで、ニス層と画像との密着性が向上する。ニス層にケイ素化合物を含む燃焼炎を吹き付けることにより該表面改質を行う場合は、酸化ケイ素被膜上でインクがうまく濡れ広がることから、空缶の下地が透けないという効果をも奏する。
　なお、インクジェット印刷以外の印刷としては、スクリーン印刷やホットスタンプでも、同様な効果を実現することができる。 <Printing process>
The printing step is a step of printing an image on a varnish layer of an empty can having an opening subjected to necking. Preferably, the image is an inkjet image. The method of image printing is not particularly limited, and a known method is applied. For example, a method of directly printing ink on an empty can by inkjet printing, or a method of forming an image on a transfer medium once and then transferring the image to the empty can may be used. A known method may be applied as a method of directly printing ink on an empty can by inkjet printing. Ink jet printing enables pattern printing, photo printing, image printing, and the like, and the design of the empty can surface is significantly improved. In this embodiment, the adhesion between the varnish layer and the image is improved by performing the surface modification of the varnish layer. In the case where the surface modification is performed by spraying a combustion flame containing a silicon compound on the varnish layer, the ink can be spread well on the silicon oxide film, so that the base of the empty can is not transparent.
It should be noted that a similar effect can be realized by screen printing or hot stamping as printing other than ink jet printing.
　また、本発明の別の実施形態は、上記製造方法により製造された缶であり、次のような構成を有する。即ち、ネッキング加工が施された空缶であって、空缶表面上に、ワックス成分を含むニス層と、インクジェット画像層と、がこの順に積層された、空缶である。そして、前記ニス層と前記インクジェット画像層との間に、前記ニス層の表面が改質された表面改質層を含むことが好ましい。なお、本明細書において、表面改質層とは、酸化ケイ素被膜、インク受容層等の厚みを有する層に加え、プラズマ処理、コロナ処理等により改質されたニス層表面等をも意味する。
　或いは、上記製造方法により製造された缶は、ネッキング加工が施された空缶であって、空缶表面上に、ベタ印刷層、ニス層、酸化ケイ素被膜、インクジェット画像印刷層がこの順に形成された、空缶であり得る。これらの構成について、図２～図５を用いて説明する。 Another embodiment of the present invention is a can manufactured by the above manufacturing method, and has the following configuration. That is, it is an empty can that has been subjected to necking processing, in which a varnish layer containing a wax component and an inkjet image layer are laminated in this order on the surface of the empty can. And it is preferable that the surface of the varnish layer is modified between the varnish layer and the inkjet image layer. In the present specification, the surface-modified layer means a varnish layer surface or the like modified by a plasma treatment, a corona treatment, or the like, in addition to a layer having a thickness such as a silicon oxide film and an ink receiving layer.
Alternatively, the can manufactured by the above manufacturing method is an empty can subjected to necking, and a solid printing layer, a varnish layer, a silicon oxide film, and an inkjet image printing layer are formed in this order on the surface of the empty can. It can be an empty can. These configurations will be described with reference to FIGS.
　図２は、空缶表面に印刷された印刷層を、平面に展開して、上面から示した上面模式図（ａ）と、Ａ－Ａ´部の断面模式図（ｂ）である。
　図２（ａ）に示すように、展開印刷層１００は、第１の印刷部１０１と第２の印刷部である１０２を有し、第１の印刷部１０１は画像が版式印刷により印刷されており、第２の印刷部１０２はインクジェット画像がインクジェット印刷により印刷されている。
　本形態は、第２の印刷部１０２以外の箇所、即ち第１の印刷部１０１にデザイン画像を印刷した後、残りの第２の印刷部１０２をインクジェット印刷することで、空缶表面の印刷層を形成する。その断面図は、図２（ｂ）にあるとおり、第１の印刷部１０１と第２の印刷部１０２で異なる。第１の印刷部１０１は、空缶表面１０３上に、画像印刷層１０４、ニス層１０５がこの順に積層されてなる。一方第２の印刷部１０２は、空缶表面１０３上に、ニス層１０５、酸化ケイ素被膜１０６、インクジェット画像印刷層１０７がこの順に積層されてなる。このような形態により、高精細なインクジェット画像印刷層を必要な部分にのみ、印刷することが可能となる。 FIG. 2 is a schematic top view (a) showing a printed layer printed on the surface of an empty can developed on a plane and viewed from the top, and a schematic sectional view (b) of an AA ′ portion.
As shown in FIG. 2A, the developed print layer 100 has a first print unit 101 and a second print unit 102, and the first print unit 101 has an image printed by plate printing. The second printing unit 102 has an inkjet image printed by inkjet printing.
In the present embodiment, after a design image is printed on a portion other than the second printing unit 102, that is, on the first printing unit 101, the remaining second printing unit 102 is inkjet-printed, thereby forming a printing layer on the surface of the empty can. To form The cross-sectional view differs between the first printing unit 101 and the second printing unit 102 as shown in FIG. The first printing unit 101 is formed by laminating an image printing layer 104 and a varnish layer 105 on an empty can surface 103 in this order. On the other hand, the second printing unit 102 has a varnish layer 105, a silicon oxide film 106, and an ink-jet image printing layer 107 laminated on the empty can surface 103 in this order. With such a configuration, it is possible to print a high-definition inkjet image printing layer only on a necessary portion.
　別の形態として、図３の形態を例示する。図３も同様に、空缶の表面に印刷された印刷層を、平面に展開して、上面から示した上面模式図（ａ）と、Ｂ－Ｂ´部の断面模式図（ｂ）である。
　図３（ａ）に示すように、展開印刷層２００は、第１の印刷部２０１と第２の印刷部である２０２を有し、第１の印刷部２０１は画像が版式印刷により印刷されており、第２の印刷部２０２はインクジェット画像がインクジェット印刷により印刷されている。
　本形態は、缶表面全面にデザイン画像２０４を印刷し、ニスを塗布した状態、すなわちデザイン画像が印刷されたデザイン印刷缶に対し、第２の印刷部２０２相当箇所に対して表面処理を行い、その後インクジェット画像印刷することで、印刷層を形成する。その断面図は、図３（ｂ）にあるとおり、第１の印刷部２０１は、空缶表面２０３上に、画像印刷層２０４、ニス層２０５がこの順に積層されてなる。一方第２の印刷部２０２は、空缶表面２０３の上に、画像印刷層２０４、ニス層２０５、酸化ケイ素被膜２０６、ベタ印刷層２０８、インクジェット画像印刷層２０７がこの順に積層されてなる。このような形態によっても、高精細なインクジェット画像印刷層を必要な部分にのみ、印刷することが可能となる。 As another form, the form of FIG. 3 is exemplified. Similarly, FIG. 3 is a schematic top view (a) showing a print layer printed on the surface of an empty can developed on a plane and viewed from the top, and a schematic sectional view (b) of a BB ′ portion. .
As shown in FIG. 3A, the developed print layer 200 has a first print unit 201 and a second print unit 202, and the first print unit 201 has an image printed by plate printing. The second printing unit 202 has an inkjet image printed by inkjet printing.
In the present embodiment, a design image 204 is printed on the entire surface of the can, and a varnish is applied, that is, the design print can on which the design image is printed is subjected to surface treatment on a portion corresponding to the second printing unit 202, After that, a printing layer is formed by inkjet image printing. As shown in the cross-sectional view of FIG. 3B, the first printing unit 201 includes an empty can surface 203 and an image printing layer 204 and a varnish layer 205 laminated in this order. On the other hand, the second printing section 202 has an image printing layer 204, a varnish layer 205, a silicon oxide film 206, a solid printing layer 208, and an ink jet image printing layer 207 laminated in this order on an empty can surface 203. According to such an embodiment, it is possible to print a high-definition inkjet image printing layer only on a necessary portion.
　図４は、別の形態の空缶の表面に印刷された印刷層を、平面に展開して、上面から示した上面模式図（ａ）と、Ｃ－Ｃ´部の断面模式図（ｂ）である。
　図４（ａ）に示すように、展開印刷層３００は全面インクジェット画像がインクジェット印刷により印刷されている。その断面図は、図４（ｂ）にあるとおり、空缶表面３０３上に、ベタ印刷層３０４、ニス層３０５、酸化ケイ素被膜３０６、インクジェット画像印刷層３０７がこの順に積層されてなる。ベタ印刷層３０４は、白塗り層であってよく、他の単色ベタ画像であってもよい。インクジェット画像印刷層３０７は酸化ケイ素被膜３０６の存在により、インク接着力が不十分なニス３０５上であっても十分な密着性を有する。 FIG. 4 is a schematic top view (a) showing a printed layer printed on the surface of another form of an empty can developed on a plane and viewed from the top, and a schematic cross-sectional view of a CC ′ portion (b). It is.
As shown in FIG. 4A, the developed print layer 300 has an entire surface inkjet image printed by inkjet printing. As shown in the sectional view of FIG. 4B, a solid printing layer 304, a varnish layer 305, a silicon oxide film 306, and an inkjet image printing layer 307 are laminated on the empty can surface 303 in this order. The solid printing layer 304 may be a white coating layer, or may be another single-color solid image. Due to the presence of the silicon oxide film 306, the inkjet image printing layer 307 has sufficient adhesion even on the varnish 305 having insufficient ink adhesion.
　また、別の形態として、図５の形態を例示する。図５は、別の形態の空缶の表面に印刷された印刷層を、平面に展開して、上面から示した上面模式図（ａ）と、Ｄ－Ｄ´部の断面模式図（ｂ）である。
　図５（ａ）に示すように、展開印刷層４００は全面インクジェット画像がインクジェット印刷により印刷されている。その断面図は、図５（ｂ）にあるとおり、空缶表面４０３上に、ニス層４０５が積層されている。即ち、ニスが塗布してあるのみの、空缶表面に、酸化ケイ素被膜４０６を形成し、その上にベタ印刷層４０４及びインクジェット画像印刷層４０７がこの順に積層されてなる。 FIG. 5 illustrates another embodiment. FIG. 5 is a schematic top view (a) showing a printed layer printed on the surface of another form of an empty can developed from above and shown from the top, and a schematic cross-sectional view of the DD ′ portion (b). It is.
As shown in FIG. 5A, the developed print layer 400 has an entire surface inkjet image printed by inkjet printing. As shown in FIG. 5B, the varnish layer 405 is laminated on the empty can surface 403. That is, a silicon oxide film 406 is formed on the surface of an empty can where only a varnish is applied, and a solid print layer 404 and an ink jet image print layer 407 are laminated on the silicon oxide film 406 in this order.
＜充填密封工程＞
　本実施形態では、ニス層上に画像が印刷された空缶に、内容物を充填する充填密封工程を有してもよい。充填密封工程は、ネッキング加工された開口部を有する空缶に内容物を充填し密封する工程である。充填密封工程は、内容物を空缶に充填し、密封できれば特段制限はなく、内容物の種類や空缶の種類に応じ適宜実施することができる。 <Filling and sealing process>
In the present embodiment, a filling and sealing step of filling the contents into an empty can having an image printed on the varnish layer may be provided. The filling / sealing step is a step of filling and sealing the contents in an empty can having an opening subjected to necking. The filling and sealing step is not particularly limited as long as the contents can be filled and sealed in an empty can, and can be appropriately performed according to the type of the contents and the type of the empty can.
　以下、空缶表面にインクジェット画像をオフセット印刷する印刷工程を実施する印刷システムの一例について、図６を用いて説明する。
　図６は、印刷システムＩ－１００の構成の一例を示す概略図である。
　印刷システムＩ－１００は、画像形成手段である印刷ステーションＩ－１０、画像搬送手段である搬送ベルトＩ－２０、転写手段である転写ステーションＩ－３０、缶搬送手段であるマンドレルホイールＩ－４０とマンドレルＩ－４２、洗浄手段である洗浄ステーションＩ－５０、及び、被覆手段であるオーバーコートステーションＩ－６０を備える。印刷システムＩ－１００は、これら以外の構成を備えていてもよい。 Hereinafter, an example of a printing system that performs a printing process of offset printing an inkjet image on an empty can surface will be described with reference to FIG.
FIG. 6 is a schematic diagram illustrating an example of the configuration of the printing system I-100.
The printing system I-100 includes a printing station I-10 serving as an image forming unit, a transfer belt I-20 serving as an image transfer unit, a transfer station I-30 serving as a transfer unit, and a mandrel wheel I-40 serving as a can transfer unit. A mandrel I-42, a washing station I-50 as a washing means, and an overcoat station I-60 as a coating means are provided. The printing system I-100 may have a configuration other than these.
　印刷ステーションＩ－１０は、印刷ユニットＩ－１１を備え、印刷ユニットＩ－１１が備えるインクジェットプリンタヘッドにより、搬送ベルトＩ－２０が備えるブランケットＩ－２３上にインクジェット画像Ｉ－１４が形成される。印刷ユニットＩ－１１は印刷ステーションＩ－１０内に１つのみ有してもよく、複数有してもよい。印刷ユニットＩ－１１を複数有することで、高速印刷への対応が可能となり、またパス数が多い印刷方法にも対応が可能となることから、印刷画像のクオリティーが向上し、高精細のインクジェット画像Ｉ－１４をブランケットＩ－２３上に形成することができる。 The printing station I-10 includes a printing unit I-11, and an inkjet image I-14 is formed on a blanket I-23 included in the transport belt I-20 by an inkjet printer head included in the printing unit I-11. The printing unit I-11 may have only one printing unit I-10, or a plurality of printing units I-11. By having a plurality of printing units I-11, it is possible to cope with high-speed printing, and it is also possible to cope with a printing method having a large number of passes. I-14 can be formed on blanket I-23.
　印刷ユニットＩ－１１が備えるインクジェットプリンタヘッドは、典型的にはホワイト（Ｗ）、ブラック（Ｋ）、イエロー（Ｙ）、マゼンタ（Ｍ）及びシアン（Ｃ）の各色のインクを吐出する複数のノズルヘッドＩ－１２が含まれる。なお、色の順番は特に限定されないし、インクの色はこれらに限定されるものではない。そのためクリアインクでもよい。 The ink jet printer head included in the printing unit I-11 typically includes a plurality of nozzles that eject ink of each color of white (W), black (K), yellow (Y), magenta (M), and cyan (C). A head I-12 is included. The order of the colors is not particularly limited, and the colors of the inks are not limited to these. Therefore, clear ink may be used.
　印刷ユニットＩ－１１には、プライマー層（Ｐｒ）を形成するノズルベッドを備えていてもよい。その場合には、インクジェットプリンタヘッドよりも下流にプライマー層（Ｐｒ）を形成するノズルヘッドを設けることで、形成したインクジェット画像Ｉ－１４をプライマー層によって被覆することができる。
　印刷ユニットＩ－１１には、更に硬化手段としてＵＶ照射部Ｉ－１３が備えられてもよい。インクジェットプリンタヘッドが吐出するインクがＵＶ硬化性のインクである場合、ＵＶ照射により半硬化させることで、転写ステーションＩ－３０でインクジェット画像Ｉ－１４を缶Ｉ－４１に転写する際に生じ得るインク残りを抑制できる。
　また、ＵＶ照射部Ｉ－１３の代わりに、硬化手段として乾燥手段を備えていてもよい。乾燥手段は、インクジェット画像Ｉ－１４に温風を吹きかけることなどの方法で、インクジェット画像Ｉ－１４を半硬化させることができる。なお、インクジェット画像の熱による硬化には、インクが含有する熱硬化性樹脂を熱により硬化させること、インクに含まれる溶媒を熱で飛ばすことでインクを硬化させること、などが含まれ得る。 The printing unit I-11 may include a nozzle bed for forming a primer layer (Pr). In that case, by providing a nozzle head for forming a primer layer (Pr) downstream of the inkjet printer head, the formed inkjet image I-14 can be covered with the primer layer.
The printing unit I-11 may further include a UV irradiation unit I-13 as a curing unit. When the ink ejected from the inkjet printer head is a UV curable ink, the ink that can be generated when the inkjet image I-14 is transferred to the can I-41 at the transfer station I-30 by semi-curing by UV irradiation. The rest can be suppressed.
Further, a drying unit may be provided as a curing unit instead of the UV irradiation unit I-13. The drying unit can semi-cure the inkjet image I-14 by, for example, blowing hot air onto the inkjet image I-14. Note that the curing of the inkjet image by heat may include curing the thermosetting resin contained in the ink with heat, curing the ink by blowing off the solvent contained in the ink with heat, and the like.
　搬送ベルトＩ－２０は、第１ローラＩ－２１と第２ローラＩ－２２を介して環状となっており、図中矢印方向に周回することで、搬送ベルトＩ－２０のブランケットＩ－２３上に印刷されたインクジェット画像Ｉ－１４を転写ステーションＩ－３０に搬送する。搬送ベルトＩ－２０のブランケットＩ－２３は環状の搬送ベルトＩ－２０の周長に応じて、また印刷システムの稼働スピードに応じて、その数を適宜決定できる。 The transport belt I-20 is formed in an annular shape through a first roller I-21 and a second roller I-22, and rotates around in a direction indicated by an arrow in FIG. Is transported to the transfer station I-30. The number of the blankets I-23 of the transport belt I-20 can be appropriately determined according to the circumference of the annular transport belt I-20 and according to the operating speed of the printing system.
　搬送ベルトＩ－２０は可撓性を有してもよいが、可撓性が過度に大きい材料であると、ベルトの張りが不十分となり、印刷時や転写時にずれが生じる場合がある。搬送ベルトＩ－２０の材質としては特に限定されない。
　搬送ベルトＩ－２０をガイドする目的で、第１ローラＩ－２１と第２ローラＩ－２２以外に補助ローラを１つ又は複数有してもよい。 The transport belt I-20 may have flexibility, but if the material is excessively flexible, the belt may be insufficiently tensioned, causing a shift during printing or transfer. The material of the transport belt I-20 is not particularly limited.
In order to guide the transport belt I-20, one or more auxiliary rollers may be provided in addition to the first roller I-21 and the second roller I-22.
　インクジェット画像Ｉ－１４が形成されたブランケットＩ－２３は、第１ローラＩ－２１の外周に沿って、転写ステーションＩ－３０に搬送される。一方で、マンドレルホイールＩ－４０によって複数の缶Ｉ－４１が転写ステーションＩ－３０に搬送される。ブランケットＩ－２３の先端部が搬送された缶Ｉ－４１と接触することで缶Ｉ－４１は自転を開始し、またはブランケットＩ－２３の先端部が缶Ｉ－４１と接触する直前に缶Ｉ－４１は自転を開始し、接触後、ブランケットＩ－２３上に形成されたインクジェット画像Ｉ－１４は缶Ｉ－４１の周方向に転写され、缶Ｉ－４１の表面にインクジェット画像Ｉ－１４が形成される。なお、ブランケットＩ－２３と缶Ｉ－４１との位置合わせを適宜行ってもよく、位置合わせは既知の方法で行えばよい。
　また、ブランケットＩ－２３の先端部が搬送された缶Ｉ－４１と接触した際に、マンドレルホイールＩ－４０自体の回転を停止させ、マンドレルホイールＩ－４０が停止した状態でマンドレルＩ－４２の缶Ｉ－４１を自転させ、ブランケットＩ－２３上に形成されたインクジェット画像Ｉ－１４を缶Ｉ－４１に転写してもよい。本実施形態は、このような間欠的な印刷にも適用し得る。 The blanket I-23 on which the inkjet image I-14 has been formed is conveyed to the transfer station I-30 along the outer periphery of the first roller I-21. On the other hand, a plurality of cans I-41 are transported to the transfer station I-30 by the mandrel wheel I-40. When the leading end of the blanket I-23 comes into contact with the transported can I-41, the can I-41 starts rotating, or immediately before the leading end of the blanket I-23 comes into contact with the can I-41. -41 starts rotating, and after contact, the ink jet image I-14 formed on the blanket I-23 is transferred in the circumferential direction of the can I-41, and the ink jet image I-14 is formed on the surface of the can I-41. It is formed. The blanket I-23 and the can I-41 may be properly positioned, and the positioning may be performed by a known method.
When the leading end of the blanket I-23 comes into contact with the transported can I-41, the rotation of the mandrel wheel I-40 itself is stopped, and the rotation of the mandrel I-42 is stopped with the mandrel wheel I-40 stopped. The can I-41 may be rotated, and the ink jet image I-14 formed on the blanket I-23 may be transferred to the can I-41. The present embodiment can be applied to such intermittent printing.
　転写ステーションＩ－３０で、インクジェット画像Ｉ－１４がブランケットＩ－２３から缶Ｉ－４１表面へ転写された後、ブランケットＩ－２３は、洗浄ステーションＩ－５０においてその表面が洗浄されてもよい。本実施形態では、インクジェット画像Ｉ－１４は、連結部材の存在によって、ブランケットＩ－２３上へのインク残りを抑制できる。一方で、全てのインクが転写しない場合もあり得ることから、洗浄ステーションＩ－５０を設け、ブランケットＩ－２３上のインクを洗浄してもよい。 After the inkjet image I-14 has been transferred from the blanket I-23 to the surface of the can I-41 at the transfer station I-30, the surface of the blanket I-23 may be cleaned at the cleaning station I-50. In the present embodiment, the ink jet image I-14 can suppress the remaining ink on the blanket I-23 due to the presence of the connecting member. On the other hand, since all the ink may not be transferred, a cleaning station I-50 may be provided to clean the ink on the blanket I-23.
　洗浄ステーションＩ－５０は、典型的には、洗浄剤をブランケットＩ－２３上に吐出する洗浄剤供給部Ｉ－５１と、ブランケットＩ－２３上の残留インクを拭き取るスクレーパＩ－５２と、を備える。洗浄ステーションＩ－５０で表面が洗浄されたブランケットＩ－２３は、第２ローラＩ－２２にガイドされ、再度印刷ステーションＩ－１０に搬送され、その上にインクジェット画像Ｉ－１４が形成される。 The cleaning station I-50 typically includes a cleaning agent supply unit I-51 that discharges the cleaning agent onto the blanket I-23, and a scraper I-52 that wipes off residual ink on the blanket I-23. . The blanket I-23, the surface of which has been cleaned at the cleaning station I-50, is guided by the second roller I-22 and transported again to the printing station I-10, where the inkjet image I-14 is formed.
　インクジェット画像Ｉ－１４が転写された缶Ｉ－４１は、マンドレルホイールＩ－４０によりオーバーコートステーションＩ－６０に搬送される。オーバーコートステーションＩ－６０において、缶Ｉ－４１表面上に転写されたインクジェット画像Ｉ－１４は、コーティングされる。コーティングには、典型的にはニスが用いられるが、インクジェット画像を保護して耐久性を向上し得るものであれば、他のものを用いてもよい。 The can I-41 to which the inkjet image I-14 has been transferred is transported to the overcoat station I-60 by the mandrel wheel I-40. At the overcoat station I-60, the ink jet image I-14 transferred onto the surface of the can I-41 is coated. A varnish is typically used for the coating, but other varnishes may be used as long as they can protect the inkjet image and improve the durability.
　印刷システムＩ－１００中に缶表面の表面改質を行う表面改質手段を設置してもよい。例えば、缶搬送手段の転写ステーションの上流側に、表面改質手段を設置してもよい。
　また、図６に記載の印刷システムＩ－１００を用いて空缶の前印刷を行ってもよいことは言うまでも無い。 A surface modifying means for modifying the surface of the can surface may be provided in the printing system I-100. For example, a surface modifying means may be provided upstream of the transfer station of the can conveying means.
It goes without saying that pre-printing of empty cans may be performed using the printing system I-100 shown in FIG.
１０　　表面処理装置
１　　　空缶
２　　　ケイ素供給部
２１　　ノズル
２２　　タンク
３　　　天然ガス
４　　　空気
５　　　燃焼炎
６　　　装置本体
６１ａ　ガス移送部
６１ｂ　ガス移送部
６２　　噴射口
１００、２００　展開印刷層
１０１、２０１　第１の印刷部
１０２、２０２　第２の印刷部
１０３、２０３　金属缶表面
１０４、２０４　画像印刷層
１０５、２０５　ニス層
１０６、２０６　酸化ケイ素被膜
１０７、２０７　インクジェット印刷層
３００、４００　展開印刷層
３０３、４０３　金属缶表面
３０４、４０４、２０８　ベタ印刷層
３０５、４０５　ニス層
３０６、４０６　酸化ケイ素被膜
３０７、４０７　インクジェット印刷層
Ｉ－１００　印刷システム
Ｉ－１０　　印刷ステーション 
Ｉ－１１　　印刷ユニット
Ｉ－１２　　ノズルヘッド
Ｉ－１３　　ＵＶ照射部
Ｉ－１４　　インクジェット画像
Ｉ－２０　　搬送ベルト
Ｉ－２１　　第１ローラ
Ｉ－２２　　第２ローラ
Ｉ－２３　　ブランケット
Ｉ－３０　　転写ステーション
Ｉ－４０　　マンドレルホイール
Ｉ－４１　　空缶
Ｉ－４２　　マンドレル
Ｉ－５０　　洗浄ステーション
Ｉ－５１　　洗浄剤供給部
Ｉ－５２　　スクレーパ
Ｉ－６０　　オーバーコートステーション DESCRIPTION OF SYMBOLS 10 Surface treatment apparatus 1 Empty can 2 Silicon supply part 21 Nozzle 22 Tank 3 Natural gas 4 Air 5 Combustion flame 6 Device main body 61a Gas transfer part 61b Gas transfer part 62 Injection port 100, 200 Developed print layer 101, 201 First printing Parts 102, 202 Second printing part 103, 203 Metal can surface 104, 204 Image printing layer 105, 205 Varnish layer 106, 206 Silicon oxide film 107, 207 Inkjet printing layer 300, 400 Developing printing layer 303, 403 Metal can surface 304, 404, 208 Solid printing layer 305, 405 Varnish layer 306, 406 Silicon oxide coating 307, 407 Ink jet printing layer I-100 Printing system I-10 Printing station
I-11 Printing Unit I-12 Nozzle Head I-13 UV Irradiation Unit I-14 Inkjet Image I-20 Transport Belt I-21 First Roller I-22 Second Roller I-23 Blanket I-30 Transfer Station I-40 Mandrel wheel I-41 Empty can I-42 Mandrel I-50 Cleaning station I-51 Cleaning agent supply part I-52 Scraper I-60 Overcoat station

Claims (5)

  1. 　缶表面にニス層を有し、且つネッキング加工された開口部を有する空缶の、前記ニス層上に画像を印刷する印刷工程、を含む、缶の製造方法。 (4) A method for producing a can, comprising a printing step of printing an image on the varnish layer of an empty can having a varnish layer on the surface of the can and having an opening subjected to necking.
  2. 　前記印刷工程前に、前記ニス層の表面の少なくとも一部を改質する表面改質工程を含み、前記印刷工程では、前記表面改質されたニス層上に画像を印刷する、請求項１に記載の缶の製造方法。 The method according to claim 1, further comprising, before the printing step, a surface modification step of modifying at least a part of the surface of the varnish layer, wherein the printing step prints an image on the surface-modified varnish layer. A method for producing the can according to the above.
  3. 　前記印刷工程は、インクジェット印刷による印刷工程である、請求項１または２に記載の缶の製造方法。 The method according to claim 1 or 2, wherein the printing step is a printing step by inkjet printing.
  4. 　ネッキング加工された開口部を有する空缶であって、空缶表面上に、ワックス成分を含むニス層と、インクジェット画像層と、がこの順に積層された、空缶。 (4) An empty can having an opening subjected to necking, wherein a varnish layer containing a wax component and an inkjet image layer are laminated in this order on the surface of the empty can.
  5. 　前記ニス層と前記インクジェット画像層との間に、前記ニス層の表面が改質された表面改質層を含む、請求項４に記載の空缶。 The empty can according to claim 4, wherein the varnish layer includes a surface-modified layer having a modified surface, between the varnish layer and the inkjet image layer.
PCT/JP2019/025299 2018-06-26 2019-06-26 Can manufacturing method WO2020004438A1 (en)

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