WO2018174144A1 - 金属製ボトル缶およびその製造方法 - Google Patents
金属製ボトル缶およびその製造方法 Download PDFInfo
- Publication number
- WO2018174144A1 WO2018174144A1 PCT/JP2018/011353 JP2018011353W WO2018174144A1 WO 2018174144 A1 WO2018174144 A1 WO 2018174144A1 JP 2018011353 W JP2018011353 W JP 2018011353W WO 2018174144 A1 WO2018174144 A1 WO 2018174144A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- baking
- bottle
- varnish layer
- seconds
- metal
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 24
- 238000004519 manufacturing process Methods 0.000 title claims description 21
- 239000002966 varnish Substances 0.000 claims abstract description 79
- 238000000605 extraction Methods 0.000 claims abstract description 33
- 239000000758 substrate Substances 0.000 claims abstract description 23
- 239000011248 coating agent Substances 0.000 claims description 62
- 238000000576 coating method Methods 0.000 claims description 62
- 229910052751 metal Inorganic materials 0.000 claims description 42
- 239000002184 metal Substances 0.000 claims description 42
- 229920005989 resin Polymers 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 15
- 239000003973 paint Substances 0.000 claims description 13
- 239000004925 Acrylic resin Substances 0.000 claims description 11
- 230000001954 sterilising effect Effects 0.000 claims description 10
- 238000004659 sterilization and disinfection Methods 0.000 claims description 10
- 229920000178 Acrylic resin Polymers 0.000 claims description 8
- 239000003822 epoxy resin Substances 0.000 claims description 7
- 229920000647 polyepoxide Polymers 0.000 claims description 7
- 229910052782 aluminium Inorganic materials 0.000 claims description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 229920003180 amino resin Polymers 0.000 claims description 6
- 239000004645 polyester resin Substances 0.000 claims description 6
- 229920001225 polyester resin Polymers 0.000 claims description 6
- 238000010409 ironing Methods 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 3
- ZWEHNKRNPOVVGH-UHFFFAOYSA-N 2-Butanone Chemical compound CCC(C)=O ZWEHNKRNPOVVGH-UHFFFAOYSA-N 0.000 description 90
- 239000010410 layer Substances 0.000 description 61
- 238000005336 cracking Methods 0.000 description 18
- 239000000463 material Substances 0.000 description 14
- 238000012545 processing Methods 0.000 description 13
- 238000011156 evaluation Methods 0.000 description 10
- 238000010438 heat treatment Methods 0.000 description 7
- 229910000838 Al alloy Inorganic materials 0.000 description 6
- 239000004593 Epoxy Substances 0.000 description 5
- 239000005011 phenolic resin Substances 0.000 description 5
- 230000000903 blocking effect Effects 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- -1 for example Substances 0.000 description 3
- 230000009477 glass transition Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000001771 impaired effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- KCTAWXVAICEBSD-UHFFFAOYSA-N prop-2-enoyloxy prop-2-eneperoxoate Chemical compound C=CC(=O)OOOC(=O)C=C KCTAWXVAICEBSD-UHFFFAOYSA-N 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N sulfuric acid Substances OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 229920000877 Melamine resin Polymers 0.000 description 1
- 239000004640 Melamine resin Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 235000013334 alcoholic beverage Nutrition 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 235000013405 beer Nutrition 0.000 description 1
- 239000002981 blocking agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000005010 epoxy-amino resin Substances 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 235000014214 soft drink Nutrition 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- 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
- B65D23/00—Details of bottles or jars not otherwise provided for
- B65D23/08—Coverings or external coatings
- B65D23/0807—Coatings
- B65D23/0814—Coatings characterised by the composition of the material
- B65D23/0828—Coatings characterised by the composition of the material consisting mainly of paints or lacquers
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- B05D3/0209—Multistage baking
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- B05D7/22—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 internal surfaces, e.g. of tubes
- B05D7/227—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 internal surfaces, e.g. of tubes of containers, cans or the like
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- 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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- 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
- B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
- B65D1/02—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents
- B65D1/0207—Bottles or similar containers with necks or like restricted apertures, designed for pouring contents characterised by material, e.g. composition, physical features
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- B65D23/00—Details of bottles or jars not otherwise provided for
- B65D23/02—Linings or internal coatings
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- B65D3/00—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines
- B65D3/10—Rigid or semi-rigid containers having bodies or peripheral walls of curved or partially-curved cross-section made by winding or bending paper without folding along defined lines characterised by form of integral or permanently secured end closure
- B65D3/12—Flanged discs permanently secured, e.g. by adhesives or by heat-sealing
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- B65D7/12—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls
- B65D7/14—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal characterised by wall construction or by connections between walls of skeleton or like apertured construction, e.g. baskets or carriers formed of wire mesh, of interconnected bands, bars, or rods, or of perforated sheet metal
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- B65D7/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, components made wholly or mainly of metal
- B65D7/42—Details of metal walls
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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- B05D2202/00—Metallic 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
- 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
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2254/00—Tubes
- B05D2254/02—Applying the material on the exterior of the tube
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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
- B05D2259/00—Applying the material to the internal surface of hollow articles other than tubes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D2701/00—Coatings being able to withstand changes in the shape of the substrate or to withstand welding
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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
- B05D3/0254—After-treatment
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D51/00—Making hollow objects
- B21D51/16—Making hollow objects characterised by the use of the objects
- B21D51/26—Making hollow objects characterised by the use of the objects cans or tins; Closing same in a permanent manner
- B21D51/2615—Edge treatment of cans or tins
- B21D51/2638—Necking
Definitions
- the present invention relates to a metal bottle can in which a finishing varnish layer is directly provided on a base material on the outer surface of the mouth and a method for producing the same.
- bottle cans are widely used as containers for alcoholic beverages such as beer and soft drink beverages such as coffee.
- Bottle cans are usually manufactured by the following procedure.
- An aluminum plate is formed into a bottomed cylindrical can body by drawing and ironing (DI processing).
- DI processing drawing and ironing
- Application of a size paint and its baking process for improving the adhesion of the ink or finish varnish layer to the outer surface, printing / finishing varnish application and baking process, and inner coating and baking process are sequentially performed. Thereafter, the diameter of the opening side of the can body is reduced, and a necking process for forming a cap attachment part and a screw part machining process for forming a screw part for screwing the cap onto the cap attachment part are manufactured.
- Patent Document 1 discloses that a bottomed cylindrical molded body is size-coated and baked, then printed by removing the threaded portion, and then coated with a paint to which an anti-blocking agent is added. Gel fraction of outer coating is 80 ⁇
- a bottle can manufacturing method has been proposed in which necking and screwing are performed after adjusting to a 96% cured state, and after the screw processing, at least the cap mounting portion of the bottle can is afterbaked.
- a size coat is provided to improve the adhesion between the finished varnish layer and the substrate, and the finish varnish layer is baked in an incomplete state at the time of screw processing.
- the finish varnish layer is again baked and cured to prevent blocking between the cap inner surface coating and the outer surface coating of the bottle can mouth. It has a special feature.
- Patent Document 1 requires a size coat application process and a dry baking process for the convenience of providing a size coat.
- manufacturing costs such as material costs and equipment costs increase.
- an object of the present invention is to provide a metal bottle can in which the occurrence of cracking and peeling of the finished varnish layer on the outer surface of the mouth portion of the bottle can is suppressed and which can be manufactured at a low cost.
- a metal bottle including a bottle-shaped metal base composed of a mouth portion, a shoulder portion, a trunk portion, and a bottom portion in which a screw portion is formed, On the outer surface of the mouth, a finishing varnish layer is directly provided on the metal substrate,
- a metal bottle can characterized in that the MEK extraction rate of the finished varnish layer is 2 to 8% by mass.
- the MEK extraction rate of the finished varnish layer is 7 to 8% by mass.
- the base material is made of aluminum.
- the matrix of the finishing varnish layer is a mixed resin containing a polyester resin, an epoxy resin, and an amino resin. (5) The mixed resin does not contain an acrylic resin.
- a method for producing the metal bottle can Preparing a bottle-shaped metal substrate comprising a mouth portion, a shoulder portion, a trunk portion, and a bottom portion in which a screw portion is formed; Applying a finish varnish coating to the outer surface of the metal substrate; Performing a primary baking of the paint for the finish varnish layer; A step of applying a paint for an inner surface coating to the inner surface of the metal substrate after the primary baking is performed; Performing a second baking, which is a baking of the inner surface coating film and the first baked finish varnish layer coating, to form a finished varnish layer and an inner surface coating; as well as, A step of necking and threading after secondary baking; The secondary baking is performed under baking conditions such that the MEK extraction rate of the finished varnish layer is 2 to 8% by mass according to the baking conditions employed in the primary baking.
- a method of manufacturing a metal bottle can is provided.
- the primary baking is performed at a temperature of 210 to 260 ° C. for 60 to 120 seconds, and the secondary baking is performed at a temperature of 180 to 225 ° C. for 50 to 140 seconds.
- the primary baking is performed at a temperature of 220 to 260 ° C. for 60 to 120 seconds, and the secondary baking is performed at a temperature of 195 to 225 ° C. for 80 to 140 seconds.
- the primary baking is performed at a temperature of 210 to 220 ° C. for 60 to 80 seconds, and the secondary baking is performed at a temperature of 180 to 195 ° C. for 50 to 110 seconds.
- the metal substrate having the bottle shape is a can obtained by drawing and ironing.
- the MEK extraction rate (extraction rate with methyl ethyl ketone) represents the degree of cure of the finished varnish layer. Since unreacted components decrease as curing progresses, the value of the MEK extraction rate decreases.
- the MEK extraction rate of the finished varnish layer in the bottle can mouth portion is measured by the method performed in an experimental example described later.
- retort sterilization means pressure heat sterilization at 100 ° C. or higher. Specifically, for example, it is performed by a method performed in an experimental example described later.
- the metal bottle can of the present invention has no size coat, the occurrence of cracking and peeling of the finished varnish layer at the mouth is effectively suppressed, and the opening torque is small. Also excellent.
- the reason for this is considered to be that the degree of cure of the finished varnish layer is adjusted so that the MEK extraction rate is in a limited range (2 to 8% by mass).
- Such a finished varnish layer is high enough to withstand the processing with severe adhesion to the base material, and the hardness is high enough not to cause blocking with the cap inner surface coating film. Therefore, it is possible to obtain a bottle can excellent in both processing adhesion and unplugging property without providing a size coat and even when curing is completed before the necking process.
- the finish varnish layer is provided directly on the base material without the size coat on the outer surface of the mouth portion of the bottle can. Is unnecessary, and can be manufactured at a low cost.
- the bottle can of the present invention is a bottle-shaped metal base material (hereinafter sometimes simply referred to as a base material) comprising a mouth portion, a shoulder portion, a trunk portion, and a bottom portion having a screw portion for screw-engaging with a cap. And a finish varnish layer is formed on the outer surface of the mouth portion of the metal substrate.
- the metal base having a bottle shape may be a can body integrally formed from the mouth to the bottom, or the mouth and the body are integrated and the bottom is different.
- the can which consists of a piece may be sufficient.
- a finishing varnish layer is directly provided on the base material.
- the finishing varnish layer is formed on the base material without forming a base layer such as a size coat or an ink layer.
- the metal used for the bottle can be used for the substrate without any limitation, but an aluminum substrate is preferable from the viewpoint of workability.
- Aluminum includes not only pure aluminum but also aluminum alloys.
- the MEK extraction rate of the finished varnish layer on the outer surface of the mouth is adjusted in the range of 2 to 8% by mass.
- the outstanding openability can be ensured and generation
- it is preferably 2 to 4% by mass in terms of ensuring excellent opening performance
- the MEK extraction rate is preferably 4 to 8% by mass in terms of high effect of suppressing the occurrence of cracking and peeling of the finished varnish layer.
- the MEK extraction rate is most preferably in the range of 7 to 8% by mass. If the MEK extraction rate is too high, curing is insufficient, blocking the coating film on the inner surface of the cap at the time of opening, there is a concern that the opening performance torque increases and the opening performance is impaired. If the MEK extraction rate is too low, the curing is excessive and cracking or peeling of the finished varnish layer occurs when the thread portion is processed, capped or opened. Furthermore, when heat treatment such as retort sterilization is performed, there is a possibility that the inner surface coating film may be peeled off.
- the finishing varnish layer may be made of a known material as long as the MEK extraction rate is within the above range.
- the matrix of the finishing varnish layer for example, polyester resin, epoxy acrylate resin, epoxy resin, acrylate resin, acrylic resin, amino resin, phenol resin, etc. are used. From the viewpoint that the degree of curing is easy to control, polyester resin, epoxy A mixed resin containing a resin and an amino resin is preferably used. As such a mixed resin, a non-acrylic mixed resin containing no acrylic resin is preferable, and a mixed resin selectively containing a polyester resin, an epoxy resin, and an amino resin is more preferable.
- the above-mentioned “not including an acrylic resin” means that not only an acrylic resin itself but also a resin that forms an acrylic resin by curing (for example, an epoxy acrylate resin) is not included.
- the bottle can of the present invention may be stored in a state heated to about 40 to 60 ° C. depending on the contents (hereinafter sometimes referred to as a hot state) and opened at the same temperature as in the hot state.
- a hot state a state heated to about 40 to 60 ° C. depending on the contents
- the glass transition point Tg of the resin constituting the finished varnish layer is preferably 51 to 60 ° C, and more preferably 53 to 58 ° C. If the glass transition point Tg is too high, the finished varnish layer may be cracked or peeled off during processing, and if the glass transition point Tg is too low, the opening torque at the time of opening in the hot state may increase. is there.
- finishing varnish layer may contain additives such as known curing agents and catalysts.
- the bottle can of the present invention is usually provided with an inner surface coating film in order to avoid contact between the metal and the contents (beverage).
- an inner surface coating film may be known per se and is not limited thereto.
- the inner surface coating film is often formed by epoxy / urea resin coating, epoxy / phenol resin coating, epoxy / acryl / melamine resin coating, epoxy / acryl / phenol resin coating, or the like.
- the degree of cure of the finished varnish layer is controlled within the above-described range before the necking process. Therefore, although the size coat does not exist and the manufacturing process is simple, the occurrence of cracking or peeling of the finished varnish layer due to the threaded portion processing at the mouth is suppressed. Therefore, even if the bottle can of the present invention is placed under a heating condition such as retort sterilization or hot storage and then opened in a hot state, there is no fear of peeling of the coating film. That is, the metal bottle can of the present invention can be sterilized by retort.
- the bottle can of the present invention excellent openability is exhibited by selecting an appropriate temperature and time as baking conditions for forming a finished varnish layer on the outer surface of the substrate and an inner surface coating on the inner surface of the substrate. .
- an appropriate temperature and time as baking conditions for forming a finished varnish layer on the outer surface of the substrate and an inner surface coating on the inner surface of the substrate.
- the base material of the bottle can is made of aluminum alloy and the base material of the screw cap is also made of aluminum alloy, it is filled with tap water and the screw cap is attached.
- the opening torque is preferably less than 140 N ⁇ cm, and more preferably less than 120 N ⁇ cm, in terms of more excellent openability.
- the bottle can of the present invention having such characteristics is manufactured by the following process. Preparing a metal substrate; Applying a finishing varnish coating; Performing the first baking; Applying a paint for the inner surface coating; A step of performing secondary baking; The process of necking and threading;
- a circular blank is punched from an aluminum alloy plate (JIS 3104 alloy) having a thickness of 0.35 to 0.40 mm.
- This circular blank is formed into a cup and made into a bottomed cylindrical body by drawing and ironing.
- the bottom of the bottomed cylindrical body is trimmed to a predetermined height to form a can body that becomes a metal base, washed and dried.
- the finish varnish layer coating is applied to the entire side surface including the region that becomes the mouth.
- the composition of the paint is determined by examining the type and amount of resin, the presence or absence of additives such as a catalyst and a curing agent, and the amount thereof so that the MEK extraction rate of the finish varnish layer in the mouth is within the above-described range.
- the thickness of the coating layer of the finish varnish coating is not particularly limited, but is generally set so that the film thickness after secondary baking (described in detail below) is 2 to 7 ⁇ m. It is applied by a known method such as coating.
- the primary baking is baking of the paint for the finish varnish layer.
- the finish varnish layer having the MEK extraction rate described above is not yet formed.
- the MEK extraction rate of the finished varnish layer decreases due to baking (secondary baking) for forming the next inner surface coating film. This is because it falls outside the scope of the present invention.
- the coating film for the inner surface coating is applied to the inner surface of the metal substrate (can body), and then the secondary baking is performed. A finish varnish layer and an internal coating film are formed by this secondary baking.
- the finish varnish layer is formed in two stages of primary baking and secondary baking. Therefore, these baking conditions are set so that the MEK extraction rate of the final varnish layer to be finally formed falls within a predetermined range.
- the secondary baking baking of the paint for the inner surface coating is also performed. Therefore, the baking conditions for secondary baking must be set in consideration of the properties of the inner surface coating film to be formed. For example, if the secondary baking is performed at a higher temperature for a longer time than necessary, the inner coating film is likely to be decomposed or peeled off.
- the primary baking condition is set so that the finish varnish coating is appropriately cured and then cured by the subsequent secondary baking to obtain a predetermined MEK extraction rate. Therefore, it must be set so that the properties of the inner coating are not impaired.
- the primary baking can generally be selected within the range of a temperature of 210 to 260 ° C. and a time of 60 to 120 seconds in view of the degree of cure of the finished varnish layer, and the selected primary baking
- the secondary baking has an appropriate range within a temperature range of 180 to 225 ° C. and a time of 50 to 140 seconds so as to obtain a predetermined MEK extraction rate (2 to 8% by mass). Selected.
- the primary baking in order to obtain a bottle can having particularly good opening performance, it is preferable to perform primary baking at a relatively high temperature for a long time, for example, at 220 to 260 ° C. It is desirable to perform the primary baking for 60 to 120 seconds, more preferably at 230 to 250 ° C. for 70 to 105 seconds.
- the secondary baking is performed at 195 to 225 ° C. for 80 to 140 seconds, more preferably 200 to 225 ° C. for 80 to 140 seconds, and still more preferably 205 to 220 ° C. for 90 seconds. It can be selected within a range of up to 100 seconds.
- secondary baking is preferably performed at a relatively low temperature in a short time, for example, 180 to 195 ° C. It is desirable to perform secondary baking for 50 to 110 seconds.
- a body oven for both the primary baking and the secondary baking described above.
- the pin oven which is generally used for the primary baking in the existing bottle can process, is baked by placing the can on the pin linked to the coating machine and passing through the oven. Will also stop in conjunction with.
- the body oven used for the primary baking according to the present invention the can bodies pulled out from the pins of the coating machine are placed on the oven conveyor entrance at regular intervals without bringing the can bodies into contact with each other. It is possible to control the baking temperature and time accurately because it is independent of the operating state of the coating machine. Accordingly, it is preferable to use the body oven and adjust the set temperature in the oven, the speed of the conveyor, and the like so that the temperature and baking time in the oven are within the above numerical range.
- the finished varnish layer having the MEK extraction rate within the above range is at least the mouth outer surface thread equivalent region. Formed.
- the can thus obtained is then subjected to a plurality of necking processes. In necking, the upper part of the can is reduced to a desired diameter by die neck molding. The degree of the diameter reduction is appropriately determined according to the diameter of the mouth of the bottle can, the inner volume, and the like.
- the mouth-corresponding region may be heated or heated by known means as necessary. Heating or heating to a finish varnish Tg or higher to promote the coating elongation followability of the coating film, thereby more effectively suppressing the occurrence of cracking and peeling of the finished varnish layer in severe processing such as threaded portion processing. be able to.
- the mouth-corresponding region is heated or heated before threading so that the threading and curling can be performed at a mouth temperature of 50 to 100 ° C., more preferably 70 to 90 ° C. It is good to warm.
- the bottle can of the present invention can be manufactured by the above-described manufacturing method, but the manufacturing method is not limited to this, and various design changes are possible. For example, the order of each process may be changed according to factory equipment. Moreover, you may further add the process of providing a base layer between a base material and a printing layer in the trunk
- MEK extraction rate (mass%) 100 ⁇ (AB) / (AC)
- A represents the specimen mass before extraction
- B represents the specimen mass after extraction
- C represents the specimen mass after the finish varnish peeling.
- the MEK extraction rate in the area corresponding to the screw part before processing the screw part was measured in the same manner as the screw part.
- the maximum torque value of each can at the time of opening was used as the reference value of each can.
- N 5 cans were measured, and their maximum values were evaluated according to the following criteria: 4 grades: bad, standard, good, and very good. Standard, good, and very good are acceptable levels.
- a filled bottle can was prepared in the same manner as in the evaluation of the opening performance described above, and similarly stored at 60 ° C., and then similarly opened at 60 ° C.
- the screw part of the bottle can after opening was visually observed to evaluate cracking and peeling of the finished varnish layer in the screw part.
- N 5 cans were evaluated and judged according to the following criteria in four stages: bad, standard, good, and very good.
- varnish peeling is peeling with an area.
- standard, good, and very good were set as acceptable levels.
- Bad There is peeling in more than 1 can.
- Standard No peeling in 5 cans.
- Very good No peeling or cracking in all 5 cans.
- Example 1 A circular blank was punched from an aluminum alloy JIS 3104 plate having a thickness of 0.38 mm. The circular blank was drawn and then redrawn and ironed to form a bottomed cylindrical body. The opening of this bottomed cylindrical body was trimmed to obtain a can body. Next, the can body was washed and dried, and printed on the side surface excluding the region that became the mouth when the bottle can was formed. Also, finish varnish with a mixed resin that selectively contains polyester resin, epoxy resin and amino resin on the entire side surface including the region that becomes the mouth part, and the film thickness after secondary baking is 4 ⁇ m Applied. Next, primary baking was performed at 230 ° C. for 80 seconds in a body oven.
- the inner surface paint was spray-coated on the inner surface of the can body, and secondary baking was performed at 220 ° C. for 95 seconds.
- this can body was necked at the top of the can by die neck molding a plurality of times, the mouth was threaded, and the mouth tip was curled.
- the obtained bottle can was measured and evaluated, and the results are shown in Table 1.
- the screw part inner surface coating film crack and peeling evaluation were not good.
- Example 2 A filled bottle can was prepared, measured and evaluated in the same manner as in Experimental Example 1 except that the primary baking was performed at 230 ° C. for 105 seconds and the secondary baking was performed at 205 ° C. for 95 seconds. The results are shown in Table 1.
- Example 3 A filled bottle can was prepared, measured and evaluated in the same manner as in Experimental Example 1 except that the primary baking was performed at 230 ° C. for 105 seconds and the secondary baking was performed at 220 ° C. for 95 seconds. The results are shown in Table 1. In this example, the screw part inner surface coating film cracking and peeling evaluation were not good.
- Example 4 A filled bottle can was prepared, measured and evaluated in the same manner as in Experimental Example 1 except that the primary baking was performed at 250 ° C. for 70 seconds and the secondary baking was performed at 220 ° C. for 95 seconds. The results are shown in Table 1. In this example, the screw part inner surface coating film cracking and peeling evaluation were not good.
- Example 5 A filled bottle can was prepared, measured and evaluated in the same manner as in Experimental Example 1 except that the primary baking was performed at 250 ° C. for 105 seconds and the secondary baking was performed at 220 ° C. for 95 seconds. The results are shown in Table 1. In this example, the screw part inner surface coating film cracking and peeling evaluation were not good.
- Example 6 A filled bottle can was prepared, measured and evaluated in the same manner as in Experimental Example 1 except that the primary baking was performed at 215 ° C. for 70 seconds and the secondary baking was performed at 190 ° C. for 80 seconds. The results are shown in Table 1.
- Example 7 A filled bottle can was prepared, measured and evaluated in the same manner as in Experimental Example 1 except that the primary baking was performed at 210 ° C. for 60 seconds and the secondary baking was performed at 190 ° C. for 80 seconds. The results are shown in Table 1.
- Example 8 A filled bottle can was prepared, measured and evaluated in the same manner as in Experimental Example 1 except that the primary baking was performed at 220 ° C. for 80 seconds and the secondary baking was performed at 190 ° C. for 80 seconds. The results are shown in Table 1.
- Example 9 A filled bottle can was prepared, measured and evaluated in the same manner as in Experimental Example 1 except that the primary baking was performed at 215 ° C. for 70 seconds and the secondary baking was performed at 180 ° C. for 50 seconds. The results are shown in Table 1.
- Example 10 A filled bottle can was prepared, measured and evaluated in the same manner as in Experimental Example 1 except that the primary baking was performed at 215 ° C. for 70 seconds and the secondary baking was performed at 195 ° C. for 110 seconds. The results are shown in Table 1.
- Example 11 A filled bottle can was prepared, measured and evaluated in the same manner as in Experimental Example 1 except that the primary baking was performed at 215 ° C. for 70 seconds and the secondary baking was performed at 175 ° C. for 80 seconds. The results are shown in Table 1.
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Abstract
Description
96%の硬化状態に調整してネッキング加工及びネジ加工を施し、ネジ加工後に、ボトル缶の少なくともキャップ取付け部分をアフターベークするボトル缶の製造方法を提案している。特許文献1の製造方法は、サイズコートを設けて仕上げニス層と基材との密着性を高めていること、ネジ加工の時点では仕上げニス層の焼付けをあえて不完全な状態にし、仕上げニス層を柔らかくしておき、割れや剥離等の発生を防ぐこと、および、最後に仕上げニス層を再度焼き付け、硬化させることでキャップ内面塗膜とボトル缶の口部の外面塗膜とのブロッキングを防ぐことに特徴を有する。
前記口部の外面では、前記金属製基材上に仕上げニス層が直接設けられており、
該仕上げニス層のMEK抽出率が2~8質量%であることを特徴とする金属製ボトル缶が提供される。
(1)前記仕上げニス層のMEK抽出率が7~8質量%である。
(2)レトルト殺菌が可能である。
(3)前記基材がアルミニウム製である。
(4)前記仕上げニス層のマトリックスが、ポリエステル樹脂、エポキシ樹脂およびアミノ樹脂を含む混合樹脂である。
(5)前記混合樹脂がアクリル樹脂を含んでいない。
ネジ部が形成された口部、肩部、胴部、及び底部から成るボトル形状の金属製基材を用意する工程;
前記金属製基材の外面に仕上げニス層用塗料を塗布する工程;
前記仕上げニス層用塗料の第一次焼付けを行う工程;
第一次焼付けが行われた後、前記金属製基材の内面に内面塗膜用塗料を塗布する工程;
前記内面塗膜用塗料と前記第一次焼付けされた仕上げニス層用塗料との焼付けである第二次焼付けを行って、仕上げニス層と内面塗膜とを形成する工程;
及び、
第二次焼付け後、ネッキング加工およびネジ部加工を行う工程;
を含み、第二次焼付けを、前記第一次焼付けで採用された焼付け条件に応じて、仕上げニス層のMEK抽出率が2~8質量%となるような焼付け条件で行うことを特徴とする金属製ボトル缶の製造方法が提供される。
(6)前記第一次焼付けを、210~260℃の温度で60~120秒かけて行い、前記第二次焼付けを180~225℃の温度で50~140秒かけて行こと。
(7)前記第一次焼付けを、220~260℃の温度で60~120秒かけて行い、前記第二次焼付けを195~225℃の温度で80~140秒かけて行うこと。
(8)前記第一次焼付けを、210~220℃の温度で60~80秒かけて行い、前記第二次焼付けを180~195℃の温度で50~110秒かけて行うこと。
(9)前記ボトル形状を有する金属製基材が、絞りしごき加工により得られる缶体であること。
また、本発明においてレトルト殺菌とは、100℃以上での加圧加熱殺菌を意味する。具体的には、例えば、後述する実験例で行った方法により行われる。
MEK抽出率が高すぎると、硬化不十分であり、開栓時にキャップ内面の塗膜とブロッキングし、開栓性トルクが大きくなり、開栓性が損なわれる虞がある。MEK抽出率が低すぎると硬化過剰であり、ネジ部加工時、キャッピング時あるいは開栓時に仕上げニス層の割れや剥離等が発生する。さらには、レトルト殺菌等の加熱処理がなされたとき、内面塗膜に剥がれ等が生じる虞がある。
このような内面塗膜は、それ自体公知のものであってよく、これに限定されるものではないが、例えば、エポキシ樹脂、フェノール樹脂、アクリル樹脂、尿素樹脂、塩化ビニル樹脂、及びこれらの共重合体を樹脂成分とする塗料により形成される。特に、エポキシ/尿素系樹脂塗料、エポキシ/フェノール系樹脂塗料、エポキシ/アクリル/メラミン系樹脂塗料、エポキシ/アクリル/フェノール系樹脂塗料等により内面塗膜を形成する場合が多い。
即ち、本発明の金属製ボトル缶は、レトルト殺菌が可能である。事実、後述の実験例1~11を参照すると、60℃で開栓したとき、本発明のボトル缶では、仕上げニス層の剥離が全く起こっていない。また、仕上げニス層の割れに関しても、大きな割れはなく、あったとしてもごく微少な割れであり、製品として許容範囲内である。
例えば、後述の実験例に示されているように、ボトル缶の基材がアルミニウム合金製であり、且つ、ネジキャップの基材もアルミニウム合金製のとき、水道水を充填してネジキャップを装着した後、125℃、30分間のレトルト殺菌(加熱水蒸気による熱処理)を行った後、60℃で24時間保管を行い、60℃で開栓したときの開栓トルクは、150N・cm未満である。開栓性がより優れる点で、係る開栓トルクは、140N・cm未満が好ましく、120N・cm未満がさらに好ましい。
金属製基材を用意する工程;
仕上げニス層用塗料を塗布する工程;
第一次焼付けを行う工程;
内面塗膜用塗料を塗布する工程;
第二次焼付けを行う工程;
ネッキング加工およびネジ部加工を行う工程;
この第二次焼付けにより、仕上げニス層と内面塗膜とが形成される。
例えば、第一次焼付けは、一般に、仕上げニス層の硬化度合の観点から、210~260℃の温度及び60~120秒の時間の範囲内で選択することができ、選択された第一次焼付け条件に応じて、第二次焼付けは、所定のMEK抽出率(2~8質量%)が得られるように、180~225℃の温度及び50~140秒の時間の範囲内で適宜の範囲が選択される。
また、仕上げニス層用塗料は、金属製基材の外面全体に塗布されていてもよいが、本発明では、ボトル口部のネジ形成部の外面に形成されている仕上げニス層のMEK抽出率が所定の範囲にあればよい。
(MEK抽出率測定)
得られたボトル缶の内面塗膜を濃硫酸で脱膜後、水洗および風乾させた。このボトル缶の、ネジ部を30mm×30mmに切り出して試片とし、秤量した(A)。次に、秤量後試片をMEK(メチルエチルケトン)に浸漬し、MEKを沸騰させて1時間還流した。還流後、試片を未使用のMEKにて2回洗浄し、乾燥後、秤量した(B)。秤量後の試片を濃硫酸にて仕上げニス層を剥離し、水洗いし、乾燥し、秤量した(C)。秤量した数値より下記式にて抽出率を算出した。
MEK抽出率(質量%)=100×(A-B)/(A-C)
式中、Aは抽出前の試片質量を表し、
Bは抽出後の試片質量を表し、
Cは仕上げニス剥離後の試片質量を表す。
ネジ部加工前のネジ部相当領域のMEK抽出率は、ネジ部と同様にして測定した。
(開栓性評価)
得られたボトル缶に65℃の水道水400gを入れ、20℃での内圧が
100kPaとなるように窒素雰囲気でキャップ巻締を行った。使用したキャップは、JIS5000系アルミニウム合金製で内面塗膜はエポキシフェノール系樹脂である。蒸気式静置レトルト装置を用いて125℃で30分間加熱することによりレトルト殺菌した後、水冷して充填ボトル缶を作製した。その後充填ボトル缶を60℃恒温室に1日保管した。60℃での開栓トルクをトルクメータ(日本電産シンポ社、型番TNK-100B)で測定した。開栓トルクは開栓における各缶の最大トルク値を各缶の基準値とした。測定された開栓トルクが小さいほど開栓性に優れる。N=5缶を測定し、それらの最大値を以下の基準で悪い、標準、良い、非常に良い、の4段階に評価した。標準、良い、及び非常に良い、が許容レベルである。
悪い:150N・cm以上
標準:140N・cm以上150N・cm未満
良い:120N・cm以上140N・cm未満
非常に良い:120N・cm未満
上記開栓性評価と同様にして、充填ボトル缶を作製し、同様に60℃保管した後、同様に60℃で開栓した。開栓後のボトル缶のネジ部を目視観察し、ネジ部における仕上げニス層の割れ及び剥離について評価を行った。N=5缶を評価し、以下の基準で悪い、標準、良い、非常に良い、の4段階に判定した。
なお、ニス剥離とは、面積をもった剥離である。
また、目視観察状態から、標準、良い、非常に良い、を許容レベルとした。
悪い:1缶以上に剥離あり。
標準:5缶とも剥離なし。
大きな割れはない。2~5缶/5缶に微小な割れがある。
良い:5缶とも剥離なし。
大きな割れはない。1缶/5缶に微小な割れがある。
非常に良い:5缶とも剥離及び割れのいずれもなし。
得られたボトル缶に常温の実内容物(ミルク入りコーヒー、煎茶)を400gを入れ、前記開栓性評価と同様にして、キャップ巻締、レトルト殺菌、水冷を行い、充填ボトル缶を作製した。その後充填ボトル缶を常温で開栓し、開栓後のボトル缶のネジ部の内面塗膜を目視観察し、内面塗膜の割れ及び剥離について評価を行った。
内容物毎にN=5缶を評価し、以下の基準で悪い、標準、良い、非常によいとの4段階で判定した。なお、塗膜剥離とは、面積をもった剥離である。また、目視観察状態から、標準、良い、非常に良い、を許容レベルとした。
悪い:1缶以上に剥離あり。
標準:5缶とも剥離なし。
大きな割れはない。2~5缶/5缶に微小な割れがある。
良い:5缶とも剥離なし。
大きな割れはない。1缶/5缶に微小な割れがある。
非常に良い:5缶とも剥離及び割れのいずれもなし。
板厚0.38mmのアルミニウム合金JIS3104板から円形ブランクを打ち抜いた。円形ブランクを、絞り成形後、再絞りしごき成形し、有底円筒体とした。この有底円筒体の開口部をトリミングして缶体を得た。次いで、缶体を洗浄乾燥し、ボトル缶とした際に口部となる領域を除いた側面に印刷をした。また、口部となる領域を含む側面全体にポリエステル樹脂、エポキシ樹脂およびアミノ樹脂を選択的に含む混合樹脂をマトリックス樹脂とする仕上げニスを、第二次焼付け後の膜厚が4μmになるように塗布した。次いで、ボディオーブンで230℃で80秒の第一次焼付けを行った。続いて、缶体内面に内面塗料をスプレー塗布し、220℃で95秒の第二次焼付けを行った。この缶体を複数回のダイネック成形により缶上部をネッキング加工した後、口部にネジ部加工し、更に口部先端部をカール加工した。これにより、缶胴径66mmφ、口部径38mmφの400ml用ボトル缶を作製した。得られたボトル缶につき、測定、評価を行い、結果を表1に示した。
尚、この例では、ネジ部内面塗膜割れ、剥離評価が良くなかった。
第一次焼付けを230℃で105秒、第二次焼付けを205℃で95秒とした以外は、実験例1と同様にして充填ボトル缶を作製し、測定、評価した。結果を表1に示した。
第一次焼付けを230℃で105秒、第二次焼付けを220℃で95秒とした以外は、実験例1と同様にして充填ボトル缶を作製し、測定、評価した。結果を表1に示した。この例では、ネジ部内面塗膜割れ、剥離評価が良くなかった。
第一次焼付けを250℃で70秒、第二次焼付けを220℃で95秒とした以外は、実験例1と同様にして充填ボトル缶を作製し、測定、評価した。結果を表1に示した。この例では、ネジ部内面塗膜割れ、剥離評価が良くなかった。
第一次焼付けを250℃で105秒、第二次焼付けを220℃で95秒とした以外は、実験例1と同様にして充填ボトル缶を作製し、測定、評価した。結果を表1に示した。この例では、ネジ部内面塗膜割れ、剥離評価が良くなかった。
第一次焼付けを215℃で70秒、第二次焼付けを190℃で80秒とした以外は、実験例1と同様にして充填ボトル缶を作製し、測定、評価した。結果を表1に示した。
第一次焼付けを210℃で60秒、第二次焼付けを190℃で80秒とした以外は、実験例1と同様にして充填ボトル缶を作製し、測定、評価した。結果を表1に示した。
第一次焼付けを220℃で80秒、第二次焼付けを190℃で80秒とした以外は、実験例1と同様にして充填ボトル缶を作製し、測定、評価した。結果を表1に示した。
第一次焼付けを215℃で70秒、第二次焼付けを180℃で50秒とした以外は、実験例1と同様にして充填ボトル缶を作製し、測定、評価した。結果を表1に示した。
第一次焼付けを215℃で70秒、第二次焼付けを195℃で110秒とした以外は、実験例1と同様にして充填ボトル缶を作製し、測定、評価した。結果を表1に示した。
第一次焼付けを215℃で70秒、第二次焼付けを175℃で80秒とした以外は、実験例1と同様にして充填ボトル缶を作製し、測定、評価した。結果を表1に示した。
Claims (11)
- ネジ部が形成された口部、肩部、胴部、及び底部から成るボトル形状の金属製基材を含み、
前記口部の外面では、前記金属製基材上に仕上げニス層が直接設けられており、
該仕上げニス層のMEK抽出率が2~8質量%であることを特徴とする金属製ボトル缶。 - 前記仕上げニス層のMEK抽出率が7~8質量%である、請求項1に記載の金属製ボトル缶。
- レトルト殺菌が可能である、請求項1に記載の金属製ボトル缶。
- 前記金属製基材がアルミニウム製である、請求項1に記載の金属製ボトル缶。
- 前記仕上げニス層のマトリックスが、ポリエステル樹脂、エポキシ樹脂およびアミノ樹脂を含む混合樹脂である、請求項1に記載の金属製ボトル缶。
- 前記混合樹脂がアクリル樹脂を含んでいない、請求項5に記載の金属製ボトル缶。
- 請求項1に記載の金属製ボトル缶の製造方法であって、
ネジ部が形成された口部、肩部、胴部、及び底部から成るボトル形状の金属製基材を用意する工程;
前記金属製基材の外面に仕上げニス層用塗料を塗布する工程;
前記仕上げニス層用塗料のための第一次焼付けを行う工程;
第一次焼付けが行われた後、前記金属製基材の内面に内面塗膜用塗料を塗布する工程;
前記内面塗膜用塗料と前記第一次焼付けされた仕上げニス層用塗料との焼付けである第二次焼付けを行って、仕上げニス層と内面塗膜とを形成する工程;
及び、
第二次焼付け後、ネッキング加工およびネジ部加工を行う工程;
を含み、第二次焼付けを、前記第一次焼付けで採用された焼付け条件に応じて、仕上げニス層のMEK抽出率が2~8質量%となるような焼付け条件で行うことを特徴とする金属製ボトル缶の製造方法。 - 前記第一次焼付けを、210~260℃の温度で60~120秒かけて行い、前記第二次焼付けを180~225℃の温度で50~140秒かけて行う請求項7に記載の製造方法。
- 前記第一次焼付けを、220~260℃の温度で60~120秒かけて行い、前記第二次焼付けを195~225℃の温度で80~140秒かけて行う請求項8に記載の製造方法。
- 前記第一次焼付けを、210~220℃の温度で60~80秒かけて行い、前記第二次焼付けを180~195℃の温度で50~110秒かけて行う請求項8に記載の製造方法。
- 前記ボトル形状を有する金属製基材が、絞りしごき加工により得られる缶体である、請求項8に記載の金属製ボトル缶の製造方法。
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JP2019506962A JP7176509B2 (ja) | 2017-03-22 | 2018-03-22 | 金属製ボトル缶およびその製造方法 |
CN201880019506.3A CN110461723A (zh) | 2017-03-22 | 2018-03-22 | 金属瓶罐及其制造方法 |
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KR102325160B1 (ko) | 2021-11-11 |
CN114013795A (zh) | 2022-02-08 |
US11827416B2 (en) | 2023-11-28 |
US20200010242A1 (en) | 2020-01-09 |
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CN110461723A (zh) | 2019-11-15 |
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