WO1998049359A1 - Feuille d'alliage d'aluminium revetue de resine, pour des boites etirees et a parois reduites - Google Patents

Feuille d'alliage d'aluminium revetue de resine, pour des boites etirees et a parois reduites Download PDF

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Publication number
WO1998049359A1
WO1998049359A1 PCT/JP1998/001874 JP9801874W WO9849359A1 WO 1998049359 A1 WO1998049359 A1 WO 1998049359A1 JP 9801874 W JP9801874 W JP 9801874W WO 9849359 A1 WO9849359 A1 WO 9849359A1
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WO
WIPO (PCT)
Prior art keywords
aluminum alloy
resin
alloy plate
coated
thermoplastic resin
Prior art date
Application number
PCT/JP1998/001874
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English (en)
Japanese (ja)
Inventor
Keiichi Shimizu
Fumio Kunishige
Shinji Shirai
Original Assignee
Toyo Kohan Co., Ltd.
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 Toyo Kohan Co., Ltd. filed Critical Toyo Kohan Co., Ltd.
Priority to AU70804/98A priority Critical patent/AU7080498A/en
Publication of WO1998049359A1 publication Critical patent/WO1998049359A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • B05D7/51—One specific pretreatment, e.g. phosphatation, chromatation, in combination with one specific coating
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C21/00—Alloys based on aluminium
    • C22C21/06—Alloys based on aluminium with magnesium as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C22/00—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C22/05—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions
    • C23C22/68—Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous solutions with pH between 6 and 8
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C2222/00—Aspects relating to chemical surface treatment of metallic material by reaction of the surface with a reactive medium
    • C23C2222/20—Use of solutions containing silanes

Definitions

  • the present invention relates to a material used for a two-piece can manufactured by processing including drawing and ironing. More specifically, two-piece thin can wall by processing including drawing and ironing, which does not require cooling or lubrication with water or a water-based lubricant, and does not require cleaning of the can after making. Suitable for manufacturing cans, strict as a parenthesis! 0 Surface treatment suitable for aluminum alloy sheets that require film adhesion, especially processing adhesion, suitable for applications where processing is performed The present invention relates to a resin-coated aluminum alloy plate for a drawn and ironed can formed by coating an aluminum alloy plate with a thermoplastic resin. Background art
  • DI cans (Drawn and Ironed Can) obtained by drawing and ironing a tinplate or aluminum alloy plate have been used as two-piece cans in which the can body and bottom are integrally formed. Being manufactured. DI cans are prepared by drawing a tinplate or an aluminum alloy plate, then cooling and lubricating with a large amount of water or an aqueous lubricant using several successively arranged ironing dies and punches. The original sheet thickness
  • Japanese Patent Publication No. 6-3112223 discloses a method of manufacturing a two-piece can from a resin-coated metal plate by a combined processing method including drawing and ironing. This method differs from the conventional method for manufacturing DI cans in that a resin-coated metal plate coated with a high-temperature volatile lubricant is squeezed and then dry-drawn and re-drawn without using water or an aqueous lubricant.
  • a two-piece can with a thin can wall is manufactured by a combined machining method in which ironing is performed simultaneously.
  • the can is degreased and washed after being formed into a two-piece can, Drying and painting processes are not required, and 2-piece cans can be manufactured with almost no pollution of the environment.
  • the present invention has been studied for the purpose of providing a resin-coated aluminum alloy sheet suitable for this combined working method.
  • materials suitable for the composite processing method Japanese Patent Application Laid-Open No. Hei 7-2666496 discloses a material having limited yield strength, tensile strength, plate thickness, 5 center line roughness, and the like.
  • 304 H 19 aluminum alloy is indicated, it has the required strength, but the workability is insufficient for the purpose of the present invention.
  • the adhesion of the resin film coated on these aluminum alloy sheets is greatly affected by the surface condition of the aluminum alloy sheet as a base. Therefore, aluminum alloy sheets that have been subjected to the following surface treatments for the purpose of improving the adhesion between the aluminum alloy sheet and the film are used for the above-mentioned processing applications. That is,
  • the aluminum alloy plate is subjected to a phosphoric acid or chromic acid chemical conversion treatment.
  • thermosetting l-primer When coating the aluminum alloy plate with the thermoplastic resin film, apply a thermosetting l-primer to one surface of the thermoplastic resin film or the aluminum alloy plate in advance.
  • the aluminum alloy plate that has been subjected to the surface treatments (1) to (5) above is The adhesiveness of the coating on a flat plate that does not have a good surface, and the adhesiveness of the coating in applications where relatively light processing such as can lids and drawn cans are performed, are sufficiently excellent. In applications where severe processing is applied, such as canned steel, drawn steel, stretched and then ironed, the adhesion of the film is not sufficient. In the area where processing is performed, the coating peels off during processing or the adhesion after processing is extremely reduced, and flange processing is performed to provide an overhanging edge for winding the can lid on the can in the next process Also, when performing neck-in processing to reduce the diameter of the can at the upper end of the can, the coating peels off and cannot withstand severe processing.
  • An object of the present invention is to provide a resin-coated aluminum alloy sheet suitable for a combined machining method as disclosed in Japanese Patent Application Laid-Open No. 6-31223.
  • the composite processing method to which the present invention is directed is a processing method in which redrawing and ironing are performed simultaneously using a die having a pair of a redrawing part and an ironing part.
  • One of the features of the combined machining method is to reduce the dimension of the shoulder radius of the die where redrawing is to be performed, and bend and bend back the material at the die shoulder area to reduce the thickness of the can wall It is in.
  • the present invention relates to a resin which is hard to break a can wall and has a strength required for a can when performing a combined process including bending and unbending processes at a die shoulder radius portion of a small shoulder radius and a subsequent ironing process by a dry process.
  • thermoplastic resin-coated aluminum alloy plate Providing a coated aluminum alloy plate, and even after performing the severe forming process as described above, the processed film is coated with a thermoplastic resin on an aluminum alloy plate that has been subjected to a surface treatment with sufficient adhesion strength.
  • the resin-coated aluminum alloy sheet for drawn and ironed cans of the present invention is, in terms of% by weight, Mn: 0.05 to 1.0%, Mg: 2.0 to 4.0%, Si: ⁇ 0.4 inevitable. Thickness: 0.1 to 0.8 mm, with a relation of (S i + F e): ⁇ 0.8%, containing Fe: ⁇ 0.6% as a target impurity. Yield strength: 220- 400 on at least one surface of NZmm 2 of the aluminum alloy plate, after forming the silane coupling agent treatment film, wherein the coating the thermoplastic resin on both sides thereof.
  • the resin-coated aluminum alloy plate for drawn and ironed cans of the present invention has a Mn: 0% by weight.
  • the resin-coated aluminum alloy sheet for drawn and ironed cans of the present invention is, in terms of% by weight, Mn: 0.5 to 1.0%, Mg: 2.0 to 4.0%, Si: 0.05 to 0.4. %, Cu: 0.05 to 0.4%, Fe: ⁇ 0.6% as an unavoidable impurity, and (S i + Fo e)
  • the resin-coated aluminum alloy sheet for drawn and ironed cans of the present invention is, in terms of% by weight, Mn: 0.05 to 5 to 1.0%, Mg: 2.0 to 4.0%, Si: 0.05 to 0-0. 4%, Cu: 0.05 to 0.4%, Fe: ⁇ 0.6% as an inevitable impurity, and (S i + F . e): sheet thickness having a ⁇ 0. 8% relationships: 0.
  • thermoplastic resin is a thermoplastic polyester resin.
  • thermoplastic resin in the above-mentioned resin-coated aluminum alloy plate for drawing and ironing cans, it is preferable that an adhesive layer is interposed between the thermoplastic resin and the aluminum alloy plate, and both surfaces of the aluminum alloy plate are coated with the thermoplastic resin. After that, it is desirable to apply a high-temperature volatile lubricant to both surfaces.
  • the present invention has excellent strength and workability, especially excellent drawability and ironing workability in a dry process, and does not peel off the coated resin film even after being subjected to severe processing such as parentheses.
  • the aluminum substrate serving as the coated substrate of the resin-coated aluminum alloy plate serving as the coated substrate of the resin-coated aluminum alloy plate
  • each alloy component is weight
  • a 1—F e _Mn crystallized substances are lubricated during ironing. It has an effect and is indispensable for improving ironing workability.
  • the lubricating action of the A1-Fe-Mn-based crystallized substance is not necessary, and rather the workability is impaired. .
  • the crystallized product is not suitable for the combined working method for applying the resin-coated aluminum alloy sheet of the present invention.
  • the combined machining method redrawing and ironing are performed simultaneously using a die with a pair of redrawing and ironing parts, and the shoulder radius of the redrawing die is a small shoulder radius that is several times the sheet thickness or less.
  • the crystallized material significantly impairs the bending / unbending workability of the die shoulder radius portion.
  • the surface of the aluminum alloy is easily roughened and cracked, which lowers the adhesion of the coated resin film.
  • the can wall may be broken.
  • the A1-Fe-Mn-based crystallized substance is not preferable for the present invention, and it is desirable to minimize the amount.
  • Mg is an element that is more effective than Mn in improving strength. Add 2.0% or more to obtain the strength required for the can, mainly the pressure resistance of the can bottom. Mg is an expensive element, and since the formability decreases as the amount of addition increases, the upper limit is set at 4.0% from the viewpoints of formability and economy. When combined with Mn, if it exceeds 4.0%, rolling becomes difficult.
  • the two-piece can formed by molding the resin-coated aluminum alloy plate according to the present invention by using the above-described composite processing is applied to contents such as beer, carbonated drinks, and nitrogen-filled drinks, where the can pressure is positive. The internal pressure of the can varies depending on the contents.
  • a material with a large amount of Mn and Mg is applied to a material for cans that is filled with contents having a high can pressure. If the pressure strength of the can bottom is insufficient, the can bottom will buckle and become unusable as a product.
  • the yield strength and thickness of the sheet mainly affect the pressure resistance of the bottom of the can. If the yield strength is low, it is necessary to increase the thickness of the sheet, but this will impair economic efficiency. For this reason, from the economical point of view, high-strength sheets with a large amount of Mn and Mg added Thick materials are suitable, but if the strength is increased by increasing the amount of Mn or Mg added, the workability will decrease.
  • the amount of Mn and Mg is determined in consideration of the required workability.
  • the Mn content and Mg content of the aluminum alloy used for the resin-coated aluminum alloy sheet of the present invention are intermediate amounts between JIS 5182 alloy (can lid material) and JIS 3004 alloy (can body material). After using cans made from resin-coated aluminum alloy sheets, when they are reused, they can be easily recycled into JIS 5182 alloy or JIS 3004 alloy, and have excellent recyclability.
  • Si causes a phase transformation in the A1-Fe-Mn crystallized material to form a so-called hard ⁇ phase.
  • This ⁇ phase needs to be added in an amount of 0.1% or more in order to improve ironing workability in the production of DI cans. Is not preferred. Therefore, the upper limit is set to 0.4% from the viewpoint of workability. However, if it is necessary to limit the lower limit in terms of strength increase, the lower limit is 0.05%.
  • F e is related to Mn and forms an A 1 — F e — Mn crystallized substance.
  • the Al—Fe—Mn system is not preferable for the present invention from the viewpoint of bending / unbending workability, and the upper limit of Fe, which is a forming element thereof, is set to 0.6%. Preferably, it is 0.3% or less.
  • the upper limit of the amount of (S i + F e) is also set in order to keep the amount of Al-Fe-Mn crystallized substances, especially the amount of hard phase, at a low level.
  • the upper limits of the amounts of Fe and Si are determined as described above, if each is near the upper limit, the Al-Fe-Mn crystallized material impairs the workability. Therefore, the upper limit is set to 0.8%, preferably 0.4% or less.
  • Cu exhibits precipitation hardening due to A 1—Cu—Mg precipitates with Mg, and high strength It is effective from the viewpoint of chemical conversion, and it is necessary to add 0.05% or more. However, when the addition amount is large, the workability is reduced. Therefore, it is preferably 0.4% or less, and 0.2% or less. The following are more preferred.
  • the addition of Zn has the effect of making the dispersion of the crystallized matter appropriate and reduces the adverse effects of the crystallized matter, so that it is preferably contained in an amount of 0.01 to 0.5%.
  • both the sheet thickness and the lower limit of the yield strength are limited from the viewpoint of the can bottom pressure.
  • the yield strength may be low when the plate thickness is large, and the plate thickness may be small when the yield strength is high. Yield strength can be increased by aluminum alloy composition and work hardening by rolling, etc., but when it exceeds 40 ON / mm 2 , workability becomes insufficient. However, even when the yield strength and 4 0 0 NZmm 2, the plate thickness or more is required 0. 1 8 mm.
  • Cowpea Te the lower limit of the yield strength and 2 2 0 NZmm 2. In this case, if the plate thickness is 0.4 mm, sufficient pressure resistance of the can bottom can be obtained.
  • the surface treatment method for an aluminum alloy sheet of the present invention will be described.
  • the aluminum alloy plate is subjected to the following pretreatment including degreasing treatment, alkali treatment, and pickling.
  • degreasing treatment oil adhering to the surface of the aluminum alloy plate is removed using a commercially available degreasing agent.
  • the temperature of the treatment liquid is preferably in the range of 30 to 90 ° C, more preferably in the range of 40 to 80 ° C.
  • the aluminum alloy plate is immersed in the treatment solution, or the treatment solution is sprayed on the aluminum alloy plate. A processing time of 1 to 30 seconds is sufficient, and a range of 3 to 15 seconds is more preferable.
  • an aqueous solution mainly containing one or more compounds of hydroxides, carbonates, bicarbonates, phosphates, gates, and borates of alkali metals or ammonium is used.
  • the concentration of the alkaline aqueous solution is preferably in the range of 1 to 20%, more preferably in the range of 2 to 10%.
  • the temperature of the treatment liquid is preferably in the range of 30 to 80 ° C, more preferably in the range of 40 to 60 ° C.
  • a treatment method a force for immersing the aluminum alloy plate in the treatment liquid or spraying the treatment liquid onto the aluminum alloy plate is used. A processing time of 1 to 20 seconds is sufficient, and a range of 3 to 10 seconds is more preferable.
  • aqueous solution containing one or more inorganic acids of sulfuric acid, nitric acid, hydrochloric acid, and phosphoric acid as a main component is used for pickling.
  • the pickling is performed to remove the sumat formed on the surface of the aluminum alloy plate by the hot-rolling process, but in some cases, fine holes may be formed on the surface of the aluminum alloy plate at the same time.
  • the concentration of the aqueous solution of the acid used is preferably in the range of 1 to 10%, more preferably in the range of 1 to 5%.
  • the temperature of the treatment liquid is preferably in the range of room temperature to 60 ° C, more preferably in the range of room temperature to 40 ° C.
  • the aluminum alloy plate is immersed in an aqueous solution of an acid, or an aqueous solution of an acid is sprayed on the aluminum alloy plate.
  • a processing time of 1 to 10 seconds is sufficient, and a range of 1 to 5 seconds is more preferable. This completes the preprocessing.
  • silane processing is performed.
  • a silane treatment using a silane coupling agent (indicated by symbol S) or a further silane treatment after phosphoric acid chromate treatment (indicated by symbol PS) is performed.
  • a commercially available silane coupling agent is diluted with a solvent, applied to an aluminum alloy plate, and dried.
  • water alone can be used as the solvent, it is preferable to use a mixed solvent of ethanol and water.
  • the silane coupling agent When the mixing ratio of ethanol to water is more than 1: 4, the silane coupling agent is sufficiently uniformly dispersed in the mixed solution, but ethanol is expensive and is not advantageous in cost.
  • the mixing ratio is less than 4: 1, the silane coupling agent It does not disperse sufficiently evenly in the inside, and it takes a long time to dry after coating on the aluminum alloy surface.
  • the concentration of the silane coupling agent is preferably in the range of 0.5 to 20%, more preferably 1 to 10%, based on the mixed solution. If it is less than 0.5%, the applied state after drying tends to be uneven, and sufficient adhesion cannot be obtained. If it exceeds 20%, the effect of improving the adhesion saturates, and the cost is no longer advantageous.
  • the temperature of the treatment liquid is preferably in the range of room temperature to 60 ° C, more preferably in the range of room temperature to 40 ° C.
  • a treatment method after immersing an aluminum alloy plate in a treatment liquid, excess liquid is squeezed with a roll and then dried. An immersion time of 1 to 15 seconds is sufficient, and a range of 3 to 10 seconds is more preferable.
  • the treatment amount of silicon is preferably in the range of 0.3 to 3 Omg / m 2 , more preferably in the range of 1 to 1 OmgZm 2 .
  • the phosphoric acid chromate treatment is performed by using a commercially available phosphoric acid chromate treatment solution.
  • the temperature of the treatment liquid is preferably in the range of room temperature to 80 ° C, more preferably in the range of room temperature to 60 ° C.
  • a processing time of 1 to 10 seconds is sufficient, and a range of 1 to 5 seconds is more preferable.
  • Coating amount is preferably in the range of 3 ⁇ 5 OmgZm 2 as chromium, the range of 5 ⁇ 30MgZm 2 is more preferable.
  • the coating weight is less than 3 mg / m 2 as chromium almost no effect in improving the adhesion, 5 Omg / m 2 and more than a deposition amount is increased locally coating decreases the adhesion becomes uneven And the appearance is dark brown, which is not desirable.
  • the above silane treatment is performed.
  • thermoplastic resin laminated on at least one surface of the aluminum alloy plate in the present invention a single-layer or multi-layer resin film mainly composed of polyester resin, polyolefin resin, polyamide resin, polycarbonate resin, etc.
  • a resin film obtained by blending two or more of these resins or a resin film obtained by copolymerization can be used.
  • polyethylene terephthalate and ethylene terephthalate are repeated.
  • At least two types of laminated polyester resins, polycarbonate resin, or a resin obtained by blending at least one type of polycarbonate resin and the above-mentioned polyester resin, and a polycarbonate resin and the above polyester An oriented resin film made of a multi-layer resin made by laminating at least two types of resins, formed in a known extruder, stretched in one direction, or two directions, and then heat-set. And after the metal Preferably laminated on. Alternatively, the above resin may be heated and melted, extruded directly onto a metal plate, and laminated.
  • the thickness of the laminated resin film is preferably in the range of 5 to 50 m, more preferably in the range of 10 to 30 zm. When the thickness is less than 5 m, it is difficult to continuously laminate the metal plate at high speed. On the other hand, if the thickness of the laminated resin film is 50 m or more, it is not preferable in terms of economic efficiency as compared with epoxy resin paints widely used as materials for cans.
  • thermoplastic resin film may be directly laminated on an aluminum alloy plate, or may be laminated with a thermosetting adhesive such as epoxy-phenol resin interposed between the resin film and the aluminum alloy plate.
  • the resin film is laminated on the aluminum alloy plate with the thermosetting adhesive interposed by applying the thermosetting adhesive in advance on one side of the resin film or the aluminum alloy plate that adheres to each other. be able to.
  • the resin-coated aluminum alloy plate of the present invention is obtained by laminating the above-mentioned thermoplastic resin film on the aluminum alloy plate subjected to the above-mentioned surface treatment. Stacking is performed as follows. That is, the surface-treated aluminum alloy plate continuously fed from the aluminum alloy plate supply means is converted into thermoplastic resin by using the heating means. After heating to a temperature equal to or higher than the melting point of the resin film, the thermoplastic resin film sent out from the film supply means is brought into contact with both sides, superimposed between a pair of laminating rolls, sandwiched and pressed. Cool immediately.
  • a high-temperature volatile lubricant is applied to the upper surface of the thermoplastic resin film laminated as described above. It is desirable that the high-temperature volatile lubricant be scattered by 50% or more when heated for several minutes at a temperature of about 200 ° C after drawing and ironing.
  • liquid paraffin, synthetic paraffin, natural It is selected according to the processing conditions and the heating conditions after processing from a simple substance such as wax or a mixture of these.
  • properties of the lubricant to be applied those having a melting point in the range of 25 to 80 ° C and a boiling point in the range of 180 to 400 ° C are desirable for achieving the object of the present invention.
  • the amount of application should be determined in consideration of the outer surface of the can, the inner surface of the can, processing conditions, heating conditions after processing, etc., but it is 5 to 100 mg Zm 2 , preferably 3 to 100 mg Zm 2 . A range of 0 to 60 mg Zm 2 is suitable.
  • the alloy composition, plate thickness, yield strength, type of surface treatment, and characteristics of thermoplastic resin, etc. of the aluminum alloy plate are limited, and a high-temperature volatile lubricant is applied on the laminated thermoplastic resin. By doing so, a thermoplastic resin-coated aluminum alloy sheet suitable for forming a can having a thin can wall by drawing and ironing can be obtained. (Example)
  • Alloys having the compositions shown in Tables 1 and 2 are melted, fabricated, and surface-polished by a conventional method, and then subjected to a homogenizing heat treatment at 550 ° C, followed by hot rolling and further cold rolling to obtain various sheet thicknesses. did.
  • continuous annealing was performed by heating at 520 ° C for 10 seconds, and then cold-rolled again to obtain 0.16 mm, 0.18 mm, 0.25 mm, 0.40 mm, and 0.
  • a 45 mm thick plate was subjected to degreasing treatment, alkali treatment, and pretreatment for pickling under the conditions shown below. After that, surface treatment was performed under the conditions shown in Table 3.
  • a commercially available degreasing agent heated to 80 ° C (Surf Cleaner 1 3 2 N—8 (Nippon Pay The aluminum alloy plate was immersed in a 3% by weight aqueous solution of) for 15 seconds, washed with water and dried.
  • the degreased aluminum alloy plate was immersed in a 5% aqueous sodium hydroxide solution heated to 50 ° C. for 10 seconds, washed with water and dried.
  • the aluminum alloy plate subjected to the alkali treatment was immersed in 1% sulfuric acid at room temperature for 3 seconds, washed with water and dried.
  • the surface-treated aluminum alloy sheet shown in Table 3 was heated to 240 ° C, and a 20-zm-thick copolyester resin consisting of 12 mol% polyethylene isophthalate and 88 mol% polyethylene terephthalate on both surfaces.
  • the biaxially oriented film was abutted, the film and an aluminum alloy plate were sandwiched and laminated by a pair of rolls, immediately immersed in water and quenched. After drying, about 50 mg Zm 2 of grammar wax (boiling point: 115 ° C) was applied to both surfaces to prepare a test plate.
  • the test plate was evaluated for the strength after bending and unbending, the workability by composite processing, the pressure resistance, and the adhesion between the coated resin film and the surface of the aluminum alloy plate after processing.
  • the strength after bending and unbending is the case where the tensile strength of the test plate subjected to bending and unbending with a bending radius of 0.5 mm is 30% or more of the yield strength of the test plate before the bending. ⁇ (good) and less than 30% (poor).
  • the evaluation of composite workability was performed on aluminum alloy plates having a plate pressure of 0.25 mm, 0.30 mm, 0.40 mm, and 0.45 mm as shown below.
  • a drawn can with a diameter of 100 mm formed at a drawing ratio of 1.6 was processed into a primary redrawn can with a diameter of 75 mm and a can wall thickness of 80% of the original plate thickness, and the subsequent redrawability was evaluated.
  • the redrawing ratio is set to 1.15
  • the redrawing die radius is 0.4 mm
  • the clearance of the ironing die is changed to improve the processing performance at the die shoulder and ironing part. Evaluation was made based on the presence or absence of can wall rupture, and ⁇ (good) when there was no can wall rupture, and X (poor) when can wall rupture occurred.
  • the metal plate is formed into a can with a diameter of 65 mm by ordinary drawing, and after doming the bottom of the can, an internal pressure is applied.
  • the buckling pressure is evaluated by the pressure at which the can bottom buckles, and the buckling pressure is 6.3 kg. A case of f Zcm 2 or more was rated as ⁇ (good), and a case of less than 6.3 kg f Zcm 2 was rated as X (bad).
  • thermoplastic resin film The processing adhesion of the thermoplastic resin film was evaluated as follows. A strip-shaped specimen having a width in the circumferential direction of the can of 15 mm and a length in the height direction of the can of 5 Omm was cut out from the drawn and ironed can covered with the polyester film obtained as described above. The entire aluminum alloy is cut from the inner surface of the can and the outer surface of the can at the can height of this strip-shaped specimen of 110 mm (Tf: can upper end), but does not reach the film on the opposite side A cut was made to make a sample in which only one side of the film was left uncut. These samples were bent at 180 ° at the cuts, and the film was forcibly peeled at about 5-7 mm from the cuts at one of the bent parts.
  • the resin-coated aluminum alloy plate for drawn and ironed cans according to the present invention can be used for dry-type compound processing including bending / returning processing at the die shoulder round portion of the target small shoulder radius and subsequent ironing processing. It is hard to break, and it is possible to obtain a drawn and ironed can having the required strength as a can, and it has excellent processing adhesion of the resin film The resin film does not peel off even under severe processing such as drawing and ironing. Further, the Mn content and the Mg content of the aluminum alloy contained in the resin-coated aluminum alloy sheet of the present invention are intermediate between those of JIS 5182 alloy (can cover material) and JIS 304 alloy (can body material). The can produced from the resin-coated aluminum alloy sheet of the present invention is easily regenerated into a JIS 518 alloy or a JIS 304 alloy when reused after use. Excellent recyclability.

Abstract

L'invention concerne une feuille d'alliage d'aluminium, revêtue de résine, qui permet de former des boîtes étirées et rectifiées. Ces boîtes présentent une résistance qui permet de supprimer la rupture des parois observées lors d'opérations d'usinage complexes, parmi lesquelles le cintrage et le décintrage, au niveau d'une partie d'épaulement de matrice présentant un rayon inférieur, suivies de la réduction de parois, dans le cadre d'un procédé à sec. Cette feuille permet d'obtenir un film d'alliage d'aluminium présentant une résistance adhésive suffisante après l'usinage. Le procédé selon l'invention consiste à fabriquer une feuille en appliquant un traitement de silane, à l'aide d'un agent de couplage de silane seul, ou d'un traitement composite, avec du phosphate de chrome et un agent de couplage de silane, sur une feuille d'alliage d'aluminium dont les teneurs en Mn, Mg, Si, Ci, Fe et (Si+Fe), l'épaisseur et la limite d'élasticité sont contrôlées dans des plages prédéterminées, puis à recouvrir cette feuille d'une résine thermoplastique
PCT/JP1998/001874 1997-04-25 1998-04-23 Feuille d'alliage d'aluminium revetue de resine, pour des boites etirees et a parois reduites WO1998049359A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU70804/98A AU7080498A (en) 1997-04-25 1998-04-23 Resin-coated aluminum alloy sheet for drawn and ironed can

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP12156797 1997-04-25
JP9/121567 1997-04-25

Publications (1)

Publication Number Publication Date
WO1998049359A1 true WO1998049359A1 (fr) 1998-11-05

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006152371A (ja) * 2004-11-29 2006-06-15 Furukawa Sky Kk 鋳造割れ性に優れた食缶用アルミニウム合金
WO2023215308A1 (fr) * 2022-05-04 2023-11-09 Novelis Inc. Alliages d'aluminium à haute résistance pour stock d'extrémité de boîtes de conserve et leurs procédés de préparation

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Publication number Priority date Publication date Assignee Title
JPS5964781A (ja) * 1982-09-30 1984-04-12 Nippon Parkerizing Co Ltd 金属表面の皮膜形成方法
JPS63149387A (ja) * 1986-12-12 1988-06-22 Furukawa Alum Co Ltd インキの密着性が良好な塗装下地皮膜を有するキヤツプ用アルミニウム材料
JPH02501638A (ja) * 1987-10-15 1990-06-07 シーエムビー　パッケイジング（ユーケー）　リミテド 積層金属シート
JPH0491825A (ja) * 1990-08-03 1992-03-25 Kuwabara Yasunaga 被覆薄肉缶の製造方法
JPH04276046A (ja) * 1991-02-28 1992-10-01 Sky Alum Co Ltd 成形用アルミニウム合金硬質板の製造方法

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5964781A (ja) * 1982-09-30 1984-04-12 Nippon Parkerizing Co Ltd 金属表面の皮膜形成方法
JPS63149387A (ja) * 1986-12-12 1988-06-22 Furukawa Alum Co Ltd インキの密着性が良好な塗装下地皮膜を有するキヤツプ用アルミニウム材料
JPH02501638A (ja) * 1987-10-15 1990-06-07 シーエムビー　パッケイジング（ユーケー）　リミテド 積層金属シート
JPH0491825A (ja) * 1990-08-03 1992-03-25 Kuwabara Yasunaga 被覆薄肉缶の製造方法
JPH04276046A (ja) * 1991-02-28 1992-10-01 Sky Alum Co Ltd 成形用アルミニウム合金硬質板の製造方法

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006152371A (ja) * 2004-11-29 2006-06-15 Furukawa Sky Kk 鋳造割れ性に優れた食缶用アルミニウム合金
WO2023215308A1 (fr) * 2022-05-04 2023-11-09 Novelis Inc. Alliages d'aluminium à haute résistance pour stock d'extrémité de boîtes de conserve et leurs procédés de préparation

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