WO2007020955A1 - Feuille d’acier stratifiée pour boîte en deux parties et feuille stratifiée en deux parties - Google Patents

Feuille d’acier stratifiée pour boîte en deux parties et feuille stratifiée en deux parties Download PDF

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Publication number
WO2007020955A1
WO2007020955A1 PCT/JP2006/316130 JP2006316130W WO2007020955A1 WO 2007020955 A1 WO2007020955 A1 WO 2007020955A1 JP 2006316130 W JP2006316130 W JP 2006316130W WO 2007020955 A1 WO2007020955 A1 WO 2007020955A1
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WO
WIPO (PCT)
Prior art keywords
piece
adhesive
steel sheet
resin layer
laminated steel
Prior art date
Application number
PCT/JP2006/316130
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English (en)
Japanese (ja)
Inventor
Hiroshi Kubo
Katsumi Kojima
Yuka Nishihara
Yoshihiko Yasue
Hiroki Iwasa
Original Assignee
Jfe Steel Corporation
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Application filed by Jfe Steel Corporation filed Critical Jfe Steel Corporation
Publication of WO2007020955A1 publication Critical patent/WO2007020955A1/fr

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Classifications

    • 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
    • B32B15/085—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 polyolefins
    • 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
    • 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
    • B32B2311/00—Metals, their alloys or their compounds
    • B32B2311/30—Iron, e.g. 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
    • B32B2323/00—Polyalkenes
    • 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

Definitions

  • the present invention relates to a laminated steel plate suitable for manufacturing a two-piece can having a high workability such as an aerosol can and a two-piece laminate ⁇ having a high workability. Background orchid
  • Aerosol metal containers are roughly classified into 2 piece ⁇ and 3 piece cans.
  • a two-piece can is a can made up of two parts: a can body and a can lid that are integrated with the bottom of the can.
  • a three-piece can is a can made up of three parts: a can body, top lid and bottom lid.
  • Two-piece cans are beautiful because they do not have a seam (welded part), but they are generally highly processed.
  • the 3-piece can has a seam part, which is inferior to the 2'-piece can, but generally has a lower degree of processing. For this reason, two-piece cans are often used for small-scale and high-end products in the factory, and three-piece cans are often used for large-capacity and low-priced products.
  • the metal elements in aerosol two-piece cans are generally made of expensive, 3 ⁇ 4ff thick aluminum, etc., and are cheap and rarely used «ff thin tinplate or tin-free steel.
  • the reason for this is that the Air Zonole 2-piece can has a high degree of processing, so it is difficult to apply drawing and DI processing, and aluminum is manufactured using impact molding that can be applied to soft metal materials. Under these circumstances, if it is possible to use a steel plate material such as tinplate and tin-free steel that is inexpensive and thin, it is of great industrial significance.
  • Patent Documents 1 to 3 disclose a processing method of drawing processing and drawing ironing of a resin-coated metal plate, but the degree of processing described in Patent Documents 1 to 3 (the drawing ratio in Patent Documents 1 to 3) ) Is in a lower range than specified in this paper.
  • Patent Documents 1 to 3 target beverage cans, food cans and the like, and beverage cans and food cans are can bodies having a processing degree lower than the range of processing degrees defined in the present invention. Therefore, the inventors made a two-piece can with a high degree of processing by drawing ironing and multi-stage forming by using a laminated steel plate, and a problem unique to high processing occurred.
  • the resin layer There was a problem of peeling and breaking. Therefore, it is necessary to test a new manufacturing method in order to manufacture a can with high workability such as an aerosol two-piece can.
  • Patent Document 1 Japanese Patent Publication No. 7-106394
  • Patent Document 2 Japanese Patent No. 2526725
  • Patent Document 3 Japanese Unexamined Patent Application Publication No. 2004-148324 Disclosure of Invention
  • the object of the present invention is to provide a laminating steel plate suitable for the production of a high-working two-piece laminated can that can prevent peeling and breaking of the laminate resin layer even in a high-working can such as an aerosol two-piece can. And 3 ⁇ 4ft of a two-piece laminated can with a high degree of processing.
  • the present invention provides a laminated steel sheet for a two-piece can having the following characteristics. '
  • the previous self-polyolefin resin layer is a polypropylene-based resin
  • the adhesive resin layer is a mixture of adhesive polyethylene and adhesive polypropylene
  • the adhesive polyethylene in the mixture has a mass ratio of 8 to 20
  • the two-piece laminate can according to (2), wherein the two-piece laminate can is contained. (Third viewpoint)
  • Adhesive polyethylene is a homopolymer of ethylene, or ethylene and 1'-butene, 1-hexene, 1-heptene, 1-octene, 4_methyl-1-1-pentene
  • adhesive polypropylene is a homopolymer of propylene or propylene and ethylene, 1-butene, 1— Hexene, '1 _heptene, 1.-Otaten, 4-methyl-1, 1-pentene selected from one or more kinds of ⁇ -olefins, or a random copolymer
  • the polypropylene-based resin is a propylene / ethylene block copolymer, and the ratio of the propylene component of the block copolymer is not less than 50 monole% and not more than 98% mol /% (3) Or the laminated steel sheet for 2-piece cans as described in (4). (Fifth viewpoint)
  • a two-piece laminated can manufactured by multi-stage forming the laminated steel circular plate described in any one of (1) to (5), wherein the final formed body has a height h, maximum r, minimum
  • FIG. 1 is a diagram for explaining an embodiment of the manufacturing process of the can body according to the present invention.
  • FIG. 1 is a diagram for explaining an embodiment of a can manufacturing process according to the present invention.
  • a circular blank is drawn into a bottomed cylindrical shaped body by drawing (including DI processing), and further f & f self Near the opening of the molded body! This shows how to produce a two-piece can with the opening near the opening.
  • 1 is a disc-shaped blank (blank sheet) before processing
  • 2 is a straight wall part of the molded body at the base part (straight wall part that has not been treated in step D)
  • 3 is a dome-shaped part
  • Reference numeral 4 denotes a straight wall portion formed by the neck shape portion
  • reference numeral 5 denotes a taper shape portion
  • one or a plurality of stages of drawing are performed on the circular plate blank 1 to form a bottomed cylindrical molded body having a predetermined can diameter (3 ⁇ 4 r; can outer surface ridge) ( Process A).
  • dome processing is performed to form the dome-shaped portion 3 by forming the bottom of the molded body into a convex shape upward.
  • the report R of the circular plate before molding, which is equivalent in weight to the final molded body, is determined based on the measured weight of the final molded body. That is, the weight of the final molded body is measured, and the dimension ( ⁇ ) of the circular plate before molding, which becomes the same weight as this weight, is obtained, and this is the circle before the development that is equivalent in weight to the final molded body.
  • R of the plate The force that trims the end of the can during the manufacturing process of the can body
  • the R of the circular plate before molding that is equivalent in weight to the final formed body is more suitable because it eliminates the effect of trimming. It is possible to evaluate the degree of processing.
  • the resin layer is stretched in the height direction ⁇ : stretched and circumferentially; It becomes. If the degree of heating is high, the amount of resin will increase, leading to the breakage of the resin layer.
  • the parameter d / R indicating the shrinkage 3 ⁇ 4 but also the parameter h no (R ⁇ r) related to the elongation in the can height direction is used as an index of the working degree. 'This is because, in the high workability region, it is necessary to consider the stretch amount in addition to the draw ratio in order to express the workability.
  • the degree of deformation is quantified by defining the degree of processing by shrinkage and elongation. Since the resin layer stretches in the height direction and shrinks in the circumferential direction, it becomes easy to peel off. In addition to shrinkage, the amount of stretch in the height direction is also an important factor.
  • the degree of processing of the finally manufactured can body (final molded body)
  • the height h, the maximum ⁇ r, and the minimum ⁇ d of the final molded body are set so that the weight is equivalent to the final molded body.
  • the range is such that the can diameter of 0. l ⁇ dZR ⁇ 0.25 and 1.5 ⁇ h / (R-r) ⁇ 4 is satisfied.
  • the purpose of this paper is to make it possible to produce high-quality cans that have been difficult with the prior art by using laminated steel sheets.
  • the parameter dZR that defines the shrinkage satisfies 0 ⁇ 25 or less
  • the parameter ti // (R ⁇ r) that defines the degree of tension is 1.5 or more.
  • the working degree dZR of the can body to be manufactured is defined as 0 ⁇ 25 or less
  • the force h / (R ⁇ r) is defined as 1.5 or more.
  • the processing of the can body to be manufactured is defined as 0.1.l ⁇ 'd / R, and h7: (R-r) 4.
  • the resin type of laminated steel plates generally used in beverage cans and food cans is polyester represented by polyethylene terephthalate, but according to the results of the inventors' investigation, Polyolefin resin has been found to be suitable for use in general.Polyolefin resin is cheaper and more deformable than polyester, but it is inferior to IfSt raw and boats.
  • Ease of deformation is particularly important, which makes polyolefin resins more suitable than polyester resins, in other words, polyester resins are more likely to break at the processing limit for molding with a high degree of processing.
  • Polyolefin has a high processing limit and is easy to follow processing.
  • the degree of processing for each step is relatively small.
  • the ease of deformation of the resin layer by processing is related to the accumulation of internal stress as well as the tracking of processing. That is, for the same amount of deformation, the deformable and easy-to-deform polyolefin resin type produces less internal stress than the poly-ester type that is difficult to deform. As a result, the polyolefin system becomes a defect against the deterioration of adhesion due to deformation. For this reason, in the first aspect, the resin layer of the laminated steel sheet was limited to olefin.
  • the thickness of the resin layer is not particularly limited, but is preferably 1 ⁇ m ⁇ or more and 50 / m or less.
  • Film The film cost of Laminate ⁇ , less than 10 ⁇ is generally high, and the thicker the film, the better the workability, but the higher the cost. This is because the contribution is saturated and expensive.
  • the selfish polyolefin resin coating is preferably disposed as an upper layer through the steel plate surface and the adhesive resin layer. That is, it is preferable to provide a resin layer made of an adhesive resin between the steel plate and the polyolefin resin coating ⁇ . This is to place an adhesive resin layer This is to strengthen the adhesion with the steel plate.
  • Polyolefin resins are more IJ than polyester resins in terms of increased internal stress due to processing, but their initial adhesion before processing is generally inferior to polyester. For this reason, it is better to use an adhesive resin for processing that requires particularly good adhesion or for the application of an olefin resin with poor adhesion.
  • the adhesive layer may be a layer that strongly bonds the upper layer and the steel plate. ⁇
  • the lift self-polyolefin resin layer is a polypropylene resin
  • the adhesive resin layer is a mixture of adhesive polyethylene and adhesive polypropylene, It is preferable that 8 to 20% of the adhesive polyethylene is contained in the self-mixture in a mass ratio.
  • a suitable combination of an adhesive resin layer and an upper polyolefin resin is disclosed. The reason why the upper layer is limited to polyolefin resin is that olefin is excellent in extensibility.
  • the lower resin layer in contact with the steel plate surface is composed of adhesive ( ⁇ adherent) polypropylene and adhesive (adhesive) polyethylene as the main resin. These two resins are used in combination.
  • the adhesive resin layer is made of a mixture of adhesive polyethylene and adhesive polypropylene. This adhesive resin layer is made by adhering a mixture of polyethylene resin rather than using a polypropylene-based thermal adhesive tree alone. This is because the layer was IJ for the adhesion after processing.
  • the adhesive polyethylene content is defined as 8 to 20% because the adhesiveness is inferior when it falls below '0.8%, and the adhesive strength with the upper layer decreases when the polyethylene resin ratio is high. This is because if it exceeds%, delamination may occur depending on the processing.
  • the adhesive polypropylene is a propylene homopolymer, or a block or random copolymer of propylene and ⁇ -olefin.
  • ⁇ -olefin examples include ethylene, 1-butene, 1-hexene, 1_heptene, 1-octene, 4-methylolone, one pentene, and the like, and one or more of these are used. be able to. Adhesiveness. It is preferable that the mel f-florate (MFRJISK 6 7 5 8) of polypropylene is 0.5 to 20 g Z 10 0 min.
  • Adhesive polypropylene is preferably provided with an adhesive property (adhesive adhesion) by introducing an unsaturated carboxylic acid and / or its derivative into a polypropylene resin.
  • Unsaturated carboxylic acids or their derivatives used in this acid modification include maleic acid, acrylic acid, fumar / reacid, tetrahydrophthalic acid, itaconic acid, citraconic acid, crotonic acid, nadic acid, etc.
  • Lupo, acid or derivatives thereof for example, amide, imide, anhydride, ester, acid halide, etc. can be used, and one or more of these can be used, but maleic anhydride is used. It is common.
  • Graft polymerization is generally used as a method for introduction into the system.
  • graft polymerization in which maleic anhydride is from 0.01 to 5% by mass is preferable.
  • Adhesive polyethylene to be mixed with the above-mentioned adhesive polypropylene resin is an ethylene Ml polymer, or a block or random copolymer of ethylene and ⁇ -olefin, but ensures adhesion to the upper layer.
  • the latter copolymer is preferred.
  • Polyethylene resin is a block or random copolymer critical condition of ethylene and ⁇ Orefuin: ⁇ , the amount of ⁇ Orefin giving side chains Shi desirable 1-2 5 Mo / Les 0/0 les. If the amount of olefin is less than 1 monole%, the adhesiveness with the upper polypropylene resin layer is lowered. On the other hand, if it exceeds 25 mol%, the adhesiveness at room temperature increases, making it difficult.
  • olefins include propylene, 1-butene, 1-hexene, 1_heptene, 1′-one octene, 4-methyl-11-pentene, and two or more of these 1 SX can be used.
  • a particularly preferable copolymer of the polyethylene resin is a random copolymer.
  • the above-mentioned adhesive polyethylene / polyethylene melt flow lade (MF R A STM D 1 2 3 8) is preferably 0.5 to 0.50 g 7 l O m i ⁇ . .
  • the above-mentioned adhesive polyethylene is preferably one in which an adhesive property is imparted by introducing an unsaturated carboxylic acid and / or a derivative thereof into a polyethylene resin.
  • Unsaturated carboxylic acids or their derivatives used in this acidity include maleic acid, acrylic acid, fumaric acid, tetrahydrobutaric acid, itaconic acid, citraconic acid, crotonic acid, nadic acid, etc.
  • derivatives thereof such as amides, imides, anhydrides, esters, acid halides, etc., and two or more of these 1 can be used, but maleic anhydride, methyl acrylate, methizomethacrylate It is common to use ⁇ .
  • maleic anhydride or a mixture of maleic anhydride and one or more of other unsaturated carboxylic acids are examples of these acids.
  • glycidinoremetatalylate, butyl acetate, atari / retinoic acid methinore, and ionomer may be used as worms or as a mixture of two or more.
  • methods for introducing these unsaturated carboxylic acids and / or derivatives thereof into polyethylene include graft polymerization, random polymerization, and block polymerization. In particular, Gras shift polymerization of the maleic anhydride and 0. 0 1-5 mass 0/0 are preferred. ⁇
  • the adhesive layer resin composed of the adhesive polypropylene and the adhesive polyethylene was mixed so as to be 8 to 20 mol% of adhesive polyethylene.
  • the proportion of adhesive polyethylene is 8 If it is less than mol%, the adhesion to the underlying steel sheet is poor. On the other hand, if the proportion of the adhesive polyethylene exceeds 20 mol%, it will become unsuitable because peeling with 3 ⁇ 4 ⁇ (upper layer) is likely to occur.
  • an appropriate amount of a compound other than the above can be mixed with the adhesive resin as long as the effect of this effort is not impaired.
  • the thickness of the adhesive layer composed of the adhesive polypropylene and adhesive polyethylene is not particularly limited, but is preferably 2 to 10 ⁇ m. If the thickness of the adhesive layer is less than 2 ⁇ m, the adhesive resin is likely to be locally thin, the coating of the steel sheet is locally degraded, and the adhesive force S is impaired. On the other hand, adhesive resins are generally expensive, and when the adhesive layer thickness is greater than 10 / zm, there is no problem in performance, but it is not practical because it is poor in life.
  • Times' polypropylene resin is a propylene / ethylene / lenplock copolymer, and the proportion of the propylene component in the block copolymer is preferably from 50 mol% to 98 mol%.
  • 'Propylene / tylene block copolymers are known to have a sea-island structure in which polyethylene components are dispersed in a polypropylene resin in a granular form.
  • Polypropylene in the matrix (sea part) is characterized by higher strength compared to polyethylene, which is advantageous in terms of handling (eg, scratch resistance), and polyethylene component (island part) compared to polypropylene. And it has the feature of being flexible.
  • the resin layer has a tendency to form molecules; they tend to line up (orientation). As a result, internal stress increases and peeling tends to occur.
  • the presence of the island part relieves its internal stress. This is thought to be due to the relaxation of the internal stress due to the deformation of the flexible poly chain.
  • the laminated steel sheet of the present invention may be used by adding additives such as pigments, lubricants and stabilizers to the resin layer, or in addition to the resin layer specified in this effort, the resin layer having other functions is used as an upper layer.
  • the resin layer having other functions is used as an upper layer.
  • a base steel plate or an adhesive resin layer it may be arranged in an intermediate layer with the adhesive resin layer.
  • the method of laminating on the steel plate is not particularly limited, but biaxially stretched vinylome, 'or non-stretched film is heat-bonded, extrusion method in which a resin layer is directly formed on the steel plate using a T-die, etc. It can be selected as appropriate, and all have been shown to provide sufficient effects. This is because the laminated steel sheet specified in the present invention is cheaper and more economical than aluminum or the like because the base metal sheet is a steel sheet. Steel plate is a common tin fries It is better to use a tool or tinplate.
  • Tin Free Steel for example, has a metal chromium layer with an adhesion amount of 50 to 200 mg / m 2 on the surface and a chromium oxide layer with an adhesion amount of 3 to 3 Omg / m 2 in terms of metal. I like it. It is preferable that the tinplate has a sticking amount of 0. '5 to 15 gZm 2 .
  • the plate thickness is not particularly limited, but, for example, a thickness in the range of 0.15-0.30 nm is applicable. Moreover, this technology can be simply applied to aluminum materials if economic efficiency is not taken into consideration.
  • the molded body is made of a polyolefin resin glass in the middle of processing or in the final process. It is also possible to appropriately remove the orientation caused by processing by performing a heat treatment to heat above the transition point.
  • an electric furnace for the method of heat treatment is not particularly limited, an electric furnace, a gas oven. Infrared furnace, the same effect like induction heater is ⁇ that force is obtained.
  • the heating rate, heating time, and cooling rate may be appropriately selected according to the effect, but the faster the heating rate, the more efficient, and the approximate heating time is about 15 to 60 seconds. It is not limited to this, but the cooling rate is good for the cooling 53 ⁇ 4, but it may be selected appropriately depending on the effect.
  • various resin layers were formed by using a film laminating method (film heat deposition method) or a direct laminating method (direct extrusion method).
  • the film lamination was performed in two ways: one using a biaxially stretched film and one using an unstretched film.
  • a film with an upper layer thickness of 45 ⁇ m and a lower layer (adhesive resin layer) thickness of 5./m was laminated on the rain surface of the metal plate.
  • Table 1 shows the laminated steel sheet manufacturing method and the contents of the laminated steel sheet.
  • the laminating method is as follows. 'Film thermocompression bonding method 1: Film made by biaxial stretching method was hot-pressed with a nip roll while the steel plate was heated to the melting point of the resin + 10 ° C, and cooled by water cooling within 7 seconds at the next tray .
  • Film f-sticking method 2 'The unstretched film was heat-bonded with a two-ply roll while the steel plate was heated to the melting point of the resin divided by 10 ° C, and then cooled by water cooling within 7 seconds.
  • Direct extrusion method The resin pellets are kneaded and melted in an extruder, coated on a running steel plate from a T-die, and then the steel plate coated with resin in the next layer is placed at 80 ° C cooling hole. It was cooled by water cooling.
  • the adhesive resin layer is extruded together with the upper layer by the co-extrusion method and extruded from a T-die to form a film, or formed into a spherical shape on a direct turn plate.
  • the coated base plate of the comparative example was coated with an epoxy-based resin and heated at 220 ° C. for 10 minutes to form a film having a thickness of 8. '
  • BPP-PE Propylene / ethylene block copolymer.
  • the number in parentheses is the propylene copolymerization ratio (mol 0/0).
  • PP-PE A mixture of propylene and ethylene. Numbers in parentheses are mass% of ethylene.
  • a can body (final formed body) was finished according to the following procedure in accordance with the manufacturing process shown in FIG. Table 2 shows the shapes of the intermediate compact (process C) and final compact (process). Drawing process of process IV was performed in 5 stages, and reduction of process D was performed in 7 stages.
  • h, r, d, ha, and hc N R of the final molded body are the height to the open end of the final molded body, the diameter of the base portion 2 and the neck shape portion 3 respectively.
  • This is a circular plate blank before molding in which the diameter, the height of the base portion 2, the height of the neck shape portion 3, and the weight of the final molded body are equivalent (see Fig. 1).
  • the radius R of the circular plate blank was determined as follows. Measure the weight of the blank sheet before molding. Measure the weight of the final molded body after the trimming process. Based on the results of this measurement, obtain the blank sheet before molding that is equivalent in weight to the final molded body.
  • the circular plate blank before molding which is equivalent in weight to the molded body, was used.
  • Blank diameter R is the blank diameter converted from the weight of the final compact. **) The thickness of the minimum thickness of the can body / the thickness of the blank sheet. Both are steel plate thickness
  • ironing was also used as appropriate in order to produce the desired can body.
  • a hemispherical overhang with a depth of 6 mm was applied to the bottom of the can.
  • the upper end of the can was trimmed about 2 mm.
  • the upper part of the cylinder is marked with an inner tenor. This was carried out at the die neck ⁇ : where the end of the opening was pressed against the shaped die, and the final can shape shown in Table 2 was used. .
  • the can body was sheared into a rectangular shape in the height direction so that the circumferential width was 15 mm, and only the steel plate was sheared in a straight line in the circumferential direction at a position of 1 Oram from the bottom in the can height direction.
  • a test piece consisting of the 10 mm portion and the remaining portion on the bottom side in the can height direction was created from the shear position.
  • a peel test was carried out in the direction of 1.80 ° with the part where the film was peeled off and the 60 mm steel plate part being held. The minimum peel strength observed was used as an index of adhesion.
  • Can bodies C1 to C7 are examples of the present invention and showed good values for film adhesion and workability. .
  • Can bodies C 8 to l 3 and C 1 5 and 16 are examples of this effort, and the main layer is provided with polypropylene-polyethylene block copolymer, which has good workability and adhesion. .
  • the adhesion was ⁇ . ,
  • Can body C 14 is an example of this invention, in which the concentration of force polyethylene whose main layer is a poly'propylene-polyethylene block copolymer is lower than the lower limit. Both processability and adhesion are good, but adhesion 'I' students stayed at ⁇ .
  • Can body 15 is a comparative example of this effort.
  • the thermosetting paint was applied to the resin layer, and both the workability and adhesion were X.

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  • Laminated Bodies (AREA)
  • Containers Having Bodies Formed In One Piece (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)

Abstract

L’invention concerne une feuille d’acier stratifiée ayant une couche de revêtement comprenant une résine polyoléfine sur au moins une surface de la feuille d’acier. La feuille d’acier stratifiée peut s’utiliser dans la fabrication d’une boîte en deux parties satisfaisant à la relation suivante : 0,1≤d/R≤0,25 et 1,5≤h/(R-r)≤4 (où R : le rayon d’une feuille d’acier stratifiée en forme de disque non moulée d’un poids équivalent à celui du corps de la boîte en deux parties ; h : la hauteur du corps de boîte ; r: le rayon maximal du corps de boîte ; et d : le rayon minimal du corps de boîte). La feuille d’acier stratifiée peut servir à la fabrication d’un corps de boîte en deux parties ayant un degré élevé d’usinabilité comme une boîte en deux parties pour une utilisation dans une bombe aérosol. On peut ainsi réaliser une boîte en deux parties à partir d’une feuille d’acier stratifiée sans détachement ni fracture d’une couche de résine.
PCT/JP2006/316130 2005-08-12 2006-08-10 Feuille d’acier stratifiée pour boîte en deux parties et feuille stratifiée en deux parties WO2007020955A1 (fr)

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JP2005234561A JP4788234B2 (ja) 2005-08-12 2005-08-12 ２ピース缶用ラミネート鋼板及び２ピースラミネート缶
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20220033136A1 (en) * 2019-02-07 2022-02-03 Nippon Steel Corporation Can lid made of resin laminate steel sheet for resin-metal composite container, can bottom made of resin laminate steel sheet for resin-metal composite container, and resin-metal composite container

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Publication number Priority date Publication date Assignee Title
WO2010117009A1 (fr) * 2009-04-06 2010-10-14 武内プレス工業株式会社 Canette bouteille metallique

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