US20070207283A1 - Resin-Coated Metal Plate And Drawn Cans Using These Plates - Google Patents

Resin-Coated Metal Plate And Drawn Cans Using These Plates Download PDF

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Publication number
US20070207283A1
US20070207283A1 US10/563,008 US56300803A US2007207283A1 US 20070207283 A1 US20070207283 A1 US 20070207283A1 US 56300803 A US56300803 A US 56300803A US 2007207283 A1 US2007207283 A1 US 2007207283A1
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United States
Prior art keywords
resin
layer
crystallized
saturated polyester
metal plates
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US10/563,008
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English (en)
Inventor
Akio Kuroda
Takashi Iwai
Kazuhiro Sato
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Toyo Seikan Group Holdings Ltd
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Toyo Seikan Kaisha Ltd
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Assigned to TOYO SEIKAN KAISHA, LTD. reassignment TOYO SEIKAN KAISHA, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IWAI, TAKASHI, KURODA, AKIO, SATO, KAZUHIRO
Publication of US20070207283A1 publication Critical patent/US20070207283A1/en
Abandoned legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/09—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/18—Layered products comprising a layer of metal comprising iron or steel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/28—Layered products comprising a layer of synthetic resin comprising synthetic resins not wholly covered by any one of the sub-groups B32B27/30 - B32B27/42
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • 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
    • 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
    • B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
    • B65D1/26—Thin-walled containers, e.g. formed by deep-drawing operations
    • B65D1/28—Thin-walled containers, e.g. formed by deep-drawing operations formed of laminated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/06—Coating on the layer surface on metal layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/26—Polymeric coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/554—Wear resistance
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/704—Crystalline
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/714—Inert, i.e. inert to chemical degradation, corrosion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/40—Closed containers
    • B32B2439/66—Cans, tins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2439/00—Containers; Receptacles
    • B32B2439/70—Food packaging
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/13—Hollow or container type article [e.g., tube, vase, etc.]
    • Y10T428/1352—Polymer or resin containing [i.e., natural or synthetic]
    • Y10T428/1355—Elemental metal containing [e.g., substrate, foil, film, coating, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31678—Of metal
    • Y10T428/31681—Next to polyester, polyamide or polyimide [e.g., alkyd, glue, or nylon, etc.]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/31504—Composite [nonstructural laminate]
    • Y10T428/31786—Of polyester [e.g., alkyd, etc.]

Definitions

  • the present invention relates to a resin-coated metal plate and drawn cans using these plates. More specifically, the invention relates to resin-coated metal that has been laminated with special layers of resin film, and drawn cans using these resin-coated metal plates.
  • drawn cans have widely been used, which have been processed by drawing metal plates such as tin-plated steel or aluminum plates (hereinafter “DR can”).
  • the inner surface side of the can has been formed with resin-film layers, in order to prevent degradation in flavor and a deterioration of the contents due to metal elution from the metal plate, and the occurrence of pinholes and so forth.
  • the above-mentioned resin film together with being required to have superior workability in conformity with draw-processing, it is also required to have superior adherence so as to prevent peeling from the steel plate. Moreover, this resin film is required to have superior shock-resistance, in order to tolerate the shock of stamping, canning and transport.
  • the resin film should not have a very high degree of hardness. If the degree of hardness is too high, it will be low in workability and adherence, and because it is also too brittle it will be low in shock-resistance as well.
  • the present invention is conducted focusing on the above-mentioned problems of the conventional arts and the object of the invention is to provide resin-coated metal plates that prevent the wicket scars from occurring in the processes of varnishing, printing and drying. Furthermore, the object is to provide resin-coated metal plates that are laminated resin-film layers which have characteristics such as superior workability, corrosion-resistance, adherence of resin, shock-resistance and so forth.
  • Resin-coated metal plates are, according to claim 1 , comprised of metal plates, and resin film that is applied to the one surface side or to both sides of the metal plate, wherein this resin film is comprised of two layers of,
  • the drawn cans of the present invention are formed by drawing or re-drawing of the resin-coated metal plates to have the highly crystallized layer (X) becoming the inner surface side of the can.
  • FIG. 1 is a cross-section of a drawn can of the present invention.
  • the resin-coated metal plates of the present invention are comprised of metal plates and resin film that is applied, at least, to the inner surface of the metal plate.
  • a metal plate conventionally well-known metal to be generally used for producing cans is used.
  • a tin-plated steel plate (tin plate) wherein Sn (tin) is applied to the surface by a known method a tin-free steel (TFS) plate, a steel plate with Ni being applied to, a steel plate with Zn being applied to or an aluminum plate and so forth.
  • this metal plate normally has a thickness of 0.01-0.5 mm, and preferably it has a thickness of 0.1-0.2 mm.
  • two-layer resin film that is comprised of two layers of a crystallized saturated polyester resin layer [A] and a layer composed of resin [B] that is comprised of saturated polyester resin (i) and ionomer resin (ii).
  • the reason why to have two layers of resin film is to have both characteristics of enough adherence with the metal plate and corrosion-resistance against the contents to be packaged inside of the can. That is, as for the resin film contacted with the metal plate, wherein the non-crystallized layer composed of resin [B] ensures adherence during working cans, and for the resin film contacted with the contents, wherein the crystallized saturated polyester resin layer [A] which contains crystallization ensures corrosion-resistance against the contents of the can.
  • the crystallized saturated polyester resin layer [A] used in the present invention is formed from constitutional unit that is induced from dicarboxylic acid and dithydroxy compound.
  • compositions of the dicarboxylic acid to form the crystallized saturated polyester resin layer [A] are induced from particular two kinds or one kind of dicarboxylic acid. That is, the compositions of dicarboxylic acid are terephthalic acid and isophthalic acid, or only terephthalic acid.
  • compositions of dithydroxy compounds to form the crystallized saturated polyester resin layer [A] for example, there may be aliphatic dithydroxy compounds such as ethylene glycol, trimethylene glycol (propylene glycol), tetramethylene glycol, pentamethylene glycol, diethylene glycol, triethylene glycol and so forth.
  • crystallized saturated polyester resin layer [A] could contain a small amount of constitutional unit that is induced from polyfunctional compounds such astrimestic acid, pyromellitic acid, trimethylolethance, trimethylolpropane, trimethylolmethane, pentaerythritol and so forth as far as it deteriorates the object of the invention.
  • the degree of crystallization calculated by strength-ratio of 973 cm ⁇ 1 and 795 cm ⁇ 1 of IR spectrum obtained by the ATR method using 45° KRS-5 crystal is 10-60%, or preferably, 10-40%. If the degree of crystallization is less than 10%, it is difficult to have superior corrosion-resistance against the contents that have a high degree of corrosion. On the other hand, if the degree of crystallization is over 60%, it is not very desirable since that decreases workability.
  • the thickness of the polar surface where the highly crystallized layer (X) is form is not limited in the present prevention, it is desirable that it should be formed at the degree of at least of not less than 2% of the thickness of the crystallized saturated polyester resin layer LM. If the thickness is less than 2%, it is difficult to have superior corrosion-resistance against the contents that have a high degree of corrosion.
  • saturated polyester resin (i) to be used to form a layer composed of resin [B] is formed from constitutional unit that is induced from dicarboxylic acid and dithydroxy compounds.
  • the compositions of dicarboxylic acid are comprised of terephthalic acid or its ester derivative (for instance, lower alkyl ester, phenyl ester and so forth), the compositions of dithydroxy compounds are comprised of ethylene glycol or its ester plastic derivative (for instance, monocarboxylic acid ester ethylene oxide and so forth).
  • This saturated polyester resin (i) may contain constitutional unit that is induced from other kinds of dicarboxylic acid and/or other kinds of dithydroxy compounds in the amount of equal or less than 40 mol %.
  • dicarboxylic acids except for terephthalic acid there may be aromatic dicarboxylic acids such as phthalic acid, isophthalic acid, naphthalene dicarboxylic acid, diphenyl dicarboxylic acid, and diphenxyethane dicarboxylic acid; aliphatic dicarboxylic acid such as adipic acid, sobacic acid, azelaic acid, and decane dicarboxylic acid; alicyclic acid such as cyclohexane dicarboxylic acid, and so forth. These dicarboxylic acids except for terephthalic acid may be used as its ester derivatives.
  • dithydroxy compounds except for ethylene glycol there may be fumaric glycol such as propylene glycol, tetramethylene glycol, neopentyl glycol, hexamethylene glycol, dodecamethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol and polyethylene glycol; alicyclic glycol such as cyclohexane dimethanol; aromatic glycol such as varieties of bisphenol, hydroquinone, 2,2-bis (4- ⁇ -hydroxyethoxy phenyl) propane, and so forth. These dithydroxy compounds may be used as its ester derivatives.
  • fumaric glycol such as propylene glycol, tetramethylene glycol, neopentyl glycol, hexamethylene glycol, dodecamethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol and polyethylene glycol
  • alicyclic glycol such as cyclohexane dimethanol
  • aromatic glycol such as varieties of bisphenol
  • saturated polyester (i) used in the present invention could contain a small amount of constitutional unit, for instance in the amount of equal or less than 2 mol %, that is induced from polyfunctional compounds such astrimestic acid, pyromellitic acid, trimethylolethance, trimethylolpropane, trimethylolmethane, pentaerythritol and so forth.
  • ionomer resin (ii) to be used to form a layer composed of resin [B] the known ionomer resin has widely been used, that is an ionized salt wherein part or a whole of carboxyl base in the copolymerization of ethylene and ⁇ , ⁇ -unsaturated carboxylic acid has been neutralized with metal positive ion.
  • this ⁇ , ⁇ -unsaturated carboxylic acid there may be unsaturated carboxylic acids with carbon number 3-8, such as acrylic acid, metacrylic acid, maleic acid, itaconic acid, anhydrous maleic acid, maleic acid monomethylester, and so forth.
  • this metal positive ion that neutralizes carboxyl base in the copolymerization of ethylene and unsaturated carboxylic acid there may be metal positive ions of 1-2 value, such as Na + , K + , Li + , Zn + , Zn ++ , Mg ++ , Ca ++ , Co ++ , Ni ++ , Mn ++ , Pb ++ , Cu ++ and so forth.
  • metal positive ions of 1-2 value, such as Na + , K + , Li + , Zn + , Zn ++ , Mg ++ , Ca ++ , Co ++ , Ni ++ , Mn ++ , Pb ++ , Cu ++ and so forth.
  • part of the rest of carboxyl base that has not been neutralized with metal positive ion may be esterized with lower alcohol.
  • this ionomer resin (ii) there may be ionomer resin wherein part or a whole of carboxyl base in the copolymerization of ethylene and unsaturated carboxylic acids such as acrylic acid and metacrylic acid, or the copolymerization of ethylene and unsaturated carboxylic acids such as maleic acid and itaconic acid, has been neutralized with metal positive ion has been with metal positive ions such as sodium, potassium, lithium, zinc, magnesium and calcium.
  • carboxyl base in the copolymerization ethylene and acrylic acid or metacrylic acid has been neutralized with metal such as Na.
  • carboxyl base that has been neutralized with metal such as Na is blended with the carboxyl base that has not been neutralized.
  • this ionomer resin goods on the market may be used such as “Himilian (Surlyn of American DuPont company)” (name of product: produced by DuPont-Mitsui Polychemicals co., ltd.).
  • the resin film laminated on metal plates is comprised of two layers of a crystallized saturated polyester resin layer [A] and a layer composed of resin [B] mentioned above, and a layer composed of resin [B] is laminated on the above-mentioned metal plate to tightly contact with it.
  • the thickness of resin layers that have been laminated in this way is usually 5-500 ⁇ m, a total of two layers, preferably 10-100 ⁇ m, and even more preferably 20-60 ⁇ m.
  • layer [A]/layer [B] is greater than 2, it is not preferable because the shock-resistance might decrease. On the other hand, if layer [A]/layer [B] is less than 1/9, it is not preferable because it might become difficult to laminate film on metal plates with the same thickness of layer continuously and the cans that are obtained might cause pinholes.
  • the above-mentioned resin-coated metal plates in the present invention is for instance, produced in the following methods (1)-(3).
  • the resin film that is coated on the metal plate through an extruder in the condition of being melt is desired to be cooled down immediately.
  • This the resin film coated on the metal plate through an extruder in the condition of being melt is desired to be substantially unoriented and uncrystallized.
  • an adhesive agent may be applied to between the metal plate and the layer composed of resin [B], furthermore between the crystallized saturated polyester resin layer [A] and the layer composed of resin [B] to connect with each other tightly when it is necessary.
  • an adhesive agent that will harden with heat is desirable.
  • epoxy resin that contains a large amount of phenoxy resin as main agent polyester resin, urethane type resin, acryl resin and so on.
  • epoxy resin denatured epoxy resin can be used such as polyester denatured epoxy resin, and as polyester resin, denatured polyester resin can be used as well.
  • the resin as the main agent can be used as itself or with other agents. Further, as good examples of hardening agent used and blended with these main agents, there may be anhydride, aminoplast, phenol resin, urethane type hardening agents and so forth, and at least one kind of them can be used.
  • resin composition that will harden with heat using the main agents and hardening agents
  • resin composition that contains epoxy resin and anhydride
  • resin composition that contains phenol resin or polyester resin, and aminoplast or urethane type hardening agents.
  • a highly crystallized layer is formed on the polar surface of the above-mentioned the crystallized saturated polyester resin layer [A].
  • the mechanic strength is increased on the surface of the crystallized saturated polyester resin layer [A]. That is why cans could prevent the occurrence of scarring on the resin-coated surface of the inner surface side of the can while they go through the processes of the varnishing and printing devise and the baking oven for drying.
  • the highly crystallized layer (X) is formed, after resin-coated metal plates are produced in either of the above-mentioned (1)-(3) methods, by maintaining the resin-coated metal plates at a designated temperature for a designated time. That is, for instance, the resin-coated metal plates are cut in a designated size, then by applying print on the resin-coated surface and maintaining them in the baking oven at a designated temperature for a designated time, the highly crystallized layer (X) is formed on the polar surface of the crystallized saturated polyester resin layer [A]. By operating this heat treatment, as a result, resin-coated metal plates can be obtained that has a high degree of mechanic strength on the polar surface and have superior adherence to metal plates.
  • the temperature for treatment to form the highly crystallized layer (X) is equal or more than Tg+30° C. and equal or less than Tm ⁇ 10° C. of the crystallized saturated polyester resin layer [A], more specifically, it is 150° C.-200° C. If it is less than 150° C., it is difficult to obtain the highly crystallized layer (X) that has a degree of crystallization is equal or more than 10% with a designated thickness, and if it is over 200° C., it is not preferable because there is a danger of the crystallized saturated polyester resin layer [A] being deteriorated by heat.
  • the desirable time for maintaining in the oven is 10 seconds to 30 minutes. More preferably, 1 minute to 30 minutes is desirable. If it is less than 10 seconds, the highly crystallized layer (X) that has a degree of crystallization of larger than 10%, and if it is over 30 minutes, it is not desirable because there is a danger of the crystallized saturated polyester resin layer [A] being deteriorated by heat.
  • the resin-coated metal plates of the present invention are comprised of metal plates, a crystallized saturated polyester resin layer [A] and a layer composed of resin [B] having the above mentioned ration of thickness of film, wherein the layer composed of resin [B] is laminated on the metal plate to tightly contact with each other, and a highly crystallized layer (X) is formed on the polar surface of the crystallized saturated polyester resin layer [A].
  • the resin-coated metal plates of the present invention have superior shock-resistance and superior workability, especially for drawing, and when they are formed, they are uniformly worked without causing pinholes in film. Moreover, this resin film has superior adherence to the metal plate and superior workability followed by forming, thereby to obtain cans that have the superior outside appearance.
  • the drawn can of the present invention 10 is, as shown in FIG.1 of its cross section, formed drawing or re-drawing the resin-coated metal plate 11 .
  • the resin-coated metal plate that is applied resin film 12 to the only one surface side of the metal plate 11 it is drawn to have the surface of resin film as the inner surface side of the can.
  • the resin film 12 is affixed on the metal plate 11 and formed a layer composed of resin [B], and as the upper layer of that a crystallized saturated polyester resin layer [A] is formed. Moreover, a highly crystallized layer (X) is formed on the polar surface of the crystallized saturated polyester resin layer [A].
  • drawn cans are formed from the above-mentioned resin-coated metal plates
  • the resin-coated metal plates that have resin film on both surface sides of the plates are used drawn cans can be obtained that are coated with resin not only on the inner surface side of the can but also on the outer surface side of the can. They can omit the process of varnish on the outer surface side of the can that is usually operated after forming cans, and it is preferable because there is no problem of solvents scattering during varnishing and it can greatly reduce the equipment of producing cans.
  • DR cans drawn cans
  • various known methods can be adopted. That is the most general method, wherein by punching resin-coated metal plates into a disk-shape, and drawing with a punch and a die cylindrical cans with the bottom are formed, then the cylindrical cans with the bottom are subject to trimming, flange working, necking in the can wall, and forming a bead portion and so forth, and the bottom is subject to doming work and so forth thereby to obtain drawn cans.
  • the TFS steel plate used was heated and after being coated resin by a T-die, within 10 seconds it was immediately cooled down at the temperature of less than 100° C.
  • This resin-coated metal plate was cut in a designated length, and then cut in the size of 759 m ⁇ 871 mm.
  • Print was applied on the outer surface of the can and as shown in Table 2, it was heat-treated for 1-30 minutes in a baking oven at 150-200° C., and then a highly crystallized layer (X) was formed on the inner surface side of the can.
  • the resin-coated metal plates obtained in this way were, so as to have the resin-coated surface that have a highly crystallized layer become the inner surface side of the can, drawn to produce drawn cans. Moreover, at the other side of edge potion a can lid that was laminated with polyethylene telephthalate on the inner surface side was forced on by necking twice to obtain beverage cans.
  • the resin-coated metal plates of the present invention prevent wicket scars from occurring, and there are few scars on the resin-coated surface, the inner surface side of the can, during processes of varnish, print and dry. They make possible to produce superior drawn cans that have superior corrosion resistance, workability and so forth.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Laminated Bodies (AREA)
US10/563,008 2003-09-08 2003-09-08 Resin-Coated Metal Plate And Drawn Cans Using These Plates Abandoned US20070207283A1 (en)

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KR101103901B1 (ko) * 2009-12-07 2012-01-12 삼화왕관주식회사 진공 병마개 및 이의 제조방법
CN102815437B (zh) * 2012-07-09 2015-04-29 奥瑞金包装股份有限公司 二片罐的制造方法
JP6037777B2 (ja) * 2012-10-31 2016-12-07 東洋鋼鈑株式会社 絞りしごき缶用樹脂被覆金属板、絞りしごき缶および絞りしごき缶の製造方法
US20210206529A1 (en) * 2018-05-31 2021-07-08 Toyo Seikan Co., Ltd. Resin-coated steel can and method for producing the same
CN110920168B (zh) 2018-09-19 2021-02-19 宝山钢铁股份有限公司 一种双层聚酯薄膜及覆膜金属板
CN110920170A (zh) 2018-09-19 2020-03-27 宝山钢铁股份有限公司 一种单层聚酯薄膜及覆膜金属板

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DK1669189T3 (da) 2010-01-18
KR100992962B1 (ko) 2010-11-08
CN1839036A (zh) 2006-09-27
KR20060090796A (ko) 2006-08-16
EP1669189A1 (en) 2006-06-14
CN1839036B (zh) 2010-08-25
ATE449682T1 (de) 2009-12-15
DE60330280D1 (de) 2010-01-07
US20100296898A1 (en) 2010-11-25
WO2005025855A1 (ja) 2005-03-24
AU2003261992A1 (en) 2005-04-06
EP1669189B1 (en) 2009-11-25
US8133542B2 (en) 2012-03-13
EP1669189A4 (en) 2007-10-03

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