JPS61119338A - Manufacture of vessel - Google Patents

Abstract

PURPOSE:To manufacture easily a packaging vessel which is excellent in its corrosion resistance and appearance characteristic by drawing a laminated body formed by sticking a specified organic resin covering material to both faces of a steel foil by an adhesive agent. CONSTITUTION:Both faces of a steel foil 2 having 100kg/mm<2>>=sigmaB>=30kg/mm<2> tensile strength sigmaB, 120mum>=T>=15mum thickness T, and a surface treating film containing Sn, Cr, Ni, etc. on the surface are covered with thermoplastic resins 4, 6 of polyolefin, polyamide, polyester, polycarbonate, vinyl chloride resin, vinyldene chloride resin, high nitrile resin and others, by polyurethane adhesive agents 3, 5. A laminated body 1 which consists of this steel foil 2 and the organic resin covering materials 4, 6, and whose whole thickness (t) is shown by an inequality (1) is manufactured. By drawing it by a punch 11 and a die 12 by using a wrinkle holder 10, a side face seamless composite vessel which is excellent in its corrosion resistance and appearance characteristic, and has no wrinkle can be manufactured.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for manufacturing a container, and more particularly to a method for manufacturing a container, using a laminate consisting of a steel foil and an organic resin coating to improve corrosion resistance, appearance characteristics, and The present invention relates to a method for manufacturing packaging containers with excellent sealing properties, particularly composite containers with seamless sides.

Conventional technology and technical problems of the invention Conventionally, tinplate or tin free steel (TFS)
Draw-formed containers using surface-treated steel sheets such as electrolytic chromic acid treated steel sheets are widely used for canned fish, jelly, sheep cans, etc.

These surface-treated steel sheets generally have a thickness of 0.117 to 0.01 mm.
Empty cans used within a range of 23 m are difficult to dispose of, leading to the problem of so-called can pollution.

From the viewpoint of ease of disposal after use and resource conservation, there is a desire for thinner steel containers.In order to meet this demand, a laminated film consisting of steel foil and an organic resin coating is being developed. Many proposals have already been made regarding manufacturing containers with seamless sides using the same material.

However, it has been found that when the thickness of the steel plate is reduced to fe0.12 m or less and formed into a drawn container in the form of a laminate with an organic resin coating layer, the following specific problems occur. First, during drawing, wrinkles tend to occur from the flange to the side wall, and the presence of these wrinkles makes it difficult to achieve reliable sealing by heat sealing or seaming. In addition, even in containers that have been prevented from forming wrinkles, if they are filled with contents and stored for a long period of time, corrosion under the organic coating will progress on the inside of the container, especially on the side walls, resulting in a decrease in gas barrier properties or metal leaching. This has the disadvantage that the product life is significantly shortened. The reason for this is that if the wrinkle pressing force is increased to reduce wrinkles that occur during container molding, the internal organic resin coating and the adhesive interface between the internal resin coating and the steel foil may be damaged, or if no damage is caused. This is thought to be due to residual stress that causes peeling.

OBJECTS OF THE INVENTION Accordingly, it is an object of the present invention to provide a method for manufacturing containers which eliminates the aforementioned drawbacks of conventional drawn containers made from steel foil-organic resin coated laminates.

Another object of the present invention is to provide a method for manufacturing a steel foil-organic resin composite container that has a desirable combination of corrosion resistance, appearance characteristics, and sealability.

Still another object of the present invention is to provide a method for manufacturing a steel foil-organic resin composite side-sided seamless container that is easy to dispose of and also easy to manufacture.

Structure of the Invention According to the present invention, in the method for producing a container, which comprises subjecting an organic resin-coated metal foil laminate to drawing forming, the tensile strength (σB) can be increased to 100! g / dew z≧σB≧30 yu / parrot 2 ... song (1
) and the thickness (T) is 120 fim≧T≧15 ttm --(2
) and has a surface treatment film containing metallic tin, metallic chromium, or metallic nickel, and the total thickness (
1) is T1/nC/σ≧t≧3 μm --(3)
A method is provided, characterized in that the laminate with an organic resin coating is subjected to drawing forming, in which n is a number of 5.6 and C is a number of 4630.

Features and Effects of the Invention The present invention uses a steel foil equipped with a surface treatment film containing metal tin, metal chromium, or metal nickel as the steel foil, and also improves the tensile strength (σB) and thickness (1) of the steel foil. Choosing the total thickness (1) of the organic resin coating within a certain range,
This is based on the knowledge that this is critical in preventing the occurrence of wrinkles during drawing and corrosion of steel foil.

Generally, when drawing metal or resin, the peripheral area of the blank (drawing material) undergoes a reduction in dimensions in the circumferential direction while plastic flow occurs in the axial direction of the container, making it difficult to form the final container. It will be done.

In this case, when it comes to metal materials, it is recognized that the smaller the thickness of the material, the more wrinkles occur in the periphery. This is thought to be due to buckling of the material in the direction of the stallion where the thickness becomes smaller. Furthermore, with regard to drawing forming of a laminate of metal and organic resin coating, it has been observed that wrinkles occur more frequently around the seed where the thickness of the organic resin coating increases. This is thought to be because as the thickness of the resin layer increases, the resin layer itself deforms more due to the wrinkle suppressing force, making it difficult for the wrinkle suppressing force to be transmitted to the metal layer. Of course, increasing the wrinkle pressing force applied to the periphery of the material being drawn will reduce the occurrence of wrinkles, but in this case, as already mentioned, damage to the organic resin layer or contact between the organic resin layer and the metal may occur. Damage to the adhesive interface is likely to occur. Further, the necessary wrinkle suppressing force is closely related to the tensile strength of the metal, and as the tensile strength of the metal increases, generally a high wrinkle suppressing force is required.

In the present invention, the tensile strength (σB) of the steel foil is within the range of the above formula (1).

By setting the thickness σ) within the range of formula (2) above and the total thickness (t) of the organic resin coating within the range of t - formula (3) above, the container flange can be formed with a relatively small wrinkle pressing force during drawing forming. This prevents the occurrence of wrinkles on the sidewalls and side walls, thereby improving the sealing performance of the container.It also prevents damage to the resin coating layer and the adhesive interface between the coating layer and the steel foil, improving the corrosion resistance of the container. This prevents

First, the upper limit of equation (1) is determined from the wrinkle pressing force required to prevent wrinkles, and the tensile strength (σB
) exceeds this upper limit, excessive wrinkle-pressing force is required, resulting in damage to the adhesive interface and the like, resulting in a decrease in corrosion resistance. In addition, if this upper limit is exceeded, disadvantages such as cutting of the material during drawing and extremely non-uniform thickness due to non-uniform plastic flow will result.＠ Remarkable advantages when using steel foil as metal foil The stiffness and tensile strength of steel foil are significantly lower than those of aluminum foil, etc., so even if the metal foil is quite thin.

The resulting draw-formed container is strong, but if the tensile strength of the steel foil falls below the lower limit of formula (1), the above-mentioned advantages will be lost.

The lower limit value for the thickness (1) of the steel foil in equation (2) above was determined experimentally based on the phenomenon described above, and when it falls below this lower limit value, it is difficult to change other conditions. However, it is difficult to prevent wrinkles from forming.

Furthermore, below this lower limit, it is difficult to completely shut off the gas using the steel foil. Further, the upper limit value of the thickness (1) of the steel foil in the above formula (2) is determined from the intended purpose of reducing the weight of the container, saving resources, and facilitating its disposal.

The upper limit of the thickness of the organic resin coating in the above formula (3) - "it),
That is, σ・t = T"'-C... (4) is an experimental value derived from the above-mentioned consideration and experimental results, and more specifically, it is a value determined as follows. .

That is, FIG. 1 of the accompanying drawings is a diagram in which the scope of the present invention is plotted with the vertical axis representing the tensile strength σB of the steel foil and the horizontal axis representing the thickness (1) of the organic coating. In this FIG. 1, curve (4) is a hyperbola given by the above equation (4). First.

The thickness σ) of the steel foil is kept constant, σB and tt are varied one by one, and the subsequent wrinkle pressing force is set to a relatively small constant value, and it is investigated whether wrinkles occur in this laminate. A critical line as shown in curve (4) (the right side of curve (4) is the area where wrinkles occur, and the left side is the area where wrinkles do not occur) is determined. Next, if you increase the wrinkle holding force and make a similar plot, this critical line will gradually move to the right, but when the wrinkle holding force exceeds a certain value, both the right side and the left side of this critical line will move. However, damage to the organic coating and damage to the adhesive interface will occur. The above general formula (4) in the present invention is determined as a limit value that does not cause damage to the organic wavelength or damage to the adhesive interface. Furthermore, it has been found that the limit value in this case, the product of σ8 and t, is proportional to the value of T to the 17nth power when the thickness T't of the steel plate is varied.

In Fig. 1, the results of Examples and Comparative Examples described later are plotted, and when the formula t≦T1/'1・qσ8 is satisfied, prevention of wrinkles and corrosion of steel foil is effective. It will be understood that what is being done is

The lower limit of the coating thickness (1) in (3) above was determined from the viewpoint of forming a complete coating on the steel foil without coating defects such as pinholes and cracks.

It is also important from the viewpoint of corrosion resistance and workability that the steel foil used in the present invention is provided with a surface treatment layer containing a metal layer selected from the group consisting of metal tin, metal chromium, and metal nickel. Surface-treated steel foil on which these metal layers are not formed has significantly poor corrosion resistance after retort sterilization, even if the above-mentioned conditions are satisfied.

Preferred Embodiments of the Invention The preferred embodiments of the present invention will be explained in detail below.

Laminated body In FIG. 2 showing an example of the laminated body used in the present invention, this laminated body 1 includes a steel foil 2 and a surface of the steel foil 2 that is provided on the inner surface of the container, with an adhesive layer 3 interposed therebetween if necessary. It consists of an organic resin inner surface covering material 4 and an organic resin outer surface covering material 6 provided on the outer surface of the container via an adhesive layer 5t if necessary.

As the steel foil 2, any surface-treated steel foil that satisfies all of the above-mentioned restrictions is used. This surface-treated steel foil is manufactured, for example, by subjecting a steel foil that has been cold-rolled to the above-mentioned thickness to a surface treatment, and the tensile strength (σB) of the steel foil is determined by annealing the steel foil. By changing the annealing conditions, a steel foil with the desired tensile strength can be obtained.

A particularly suitable surface-treated steel foil for the purposes of the present invention is an electrolytically chromic acid treated steel foil, which comprises a metallic chromium layer on the steel foil substrate and a chromium oxide layer on the metallic chromium layer. . The thickness of the metallic chromium layer, expressed in terms of weight per area, is generally from 30 to 300m97m, in particular from 50 to 2.
The thickness of the chromium oxide layer is preferably in the range of 50 W/m'', while the thickness of the chromium oxide layer is generally 3.
It is desirable that the thickness be in the range of from 7 to 30 μ/m 2 , particularly from 7 to 30 μ/m 2 .

As already pointed out, the metallic chromium layer plays an important role in corrosion resistance and processability, but the chromium oxide layer on the metallic chromium layer also improves the adhesion of the organic resin coating to the steel foil. is important.

Another example of surface-treated steel foil with excellent corrosion resistance is one in which a nickel or tin plating layer is provided on a steel foil substrate.
The thickness of these plating layers, expressed in terms of weight per area, is generally in the range of 30 to 10,0 OOII9/m2, particularly preferably in the range of 50 to 5,000,1197 m''.

Steel foil having these metal plating layers may be manufactured by plating the steel foil rolled to the final thickness, or by plating the steel foil or steel plate before rolling to the final thickness. , this plated material is subjected to rolling treatment,
It may also be a steel foil with a desired plating treatment. It is also possible to form a film treated with chromic acid and/or phosphoric acid on these plating layers to improve the adhesion with the organic resin coating.

As the organic resin coating layers 4 and 6, any resin that can be drawn while in close contact with the steel foil can be used. Suitable examples of such resins include, but are not limited to:

(,) Polyolefins; polypropylene, /lyethylene, /ributene-1. Propylene-ethylene copolymer, propylene-butene-1 copolymer, ethylene-vinyl acetate copolymer, ionically crosslinked olefin copolymer (ionomer).

(b) 71? Lyamides; especially general formula % formula % (1) In the formula, n is a number from 3 to 13, and m is a number from 4 to 11. Polyamides consisting of repeating units represented by

For example, poly-ω-aminocaproic acid, poly-ω-aminohebutanoic acid, poly-ω-aminocaprylic acid, ylIJ
-ω-aminopelagoic acid, poly-ω-aminodecanoic acid, poly-ω-aminoundecanoic acid, 2-ω-aminododecanoic acid, poly-ω-aminotridecanoic acid, polyhexamethylene azinogumide, polyhexamethylene dodecanoic acid 1 lidodecamethylene sebacamide, polydodecamethylene dodecamide, polydodecamethylene tridecamide,
Polytridecamethylene adipamide, polytridecamethylene apamide, polytridecamethylene dodecamide, polytridecamethylene tridecamide, polydecamethylene adipamide, polydecamethylene adipamide, polydecamethylene adipamide , polytridecamethyleneadipamide or copolyamides thereof.

(C)/Reesters; especially general formula % formula % (4) where 8. is a pulkylene group having 2 to 6 carbon atoms, and R2 is an alkylene group or arylene group having 2 to 24 carbon atoms. i? +3 esters.

Example, t ha? Liethylene terephthalate, I diethylene terephthalate/isophthalate, polytetramethylene terephthalate, polyethylene/tetramethylene terephthalate, polytetramethylene terephthalate/isophthalate, polyethylene terephthalate/isophthalate, ? Litetramethylene/ethylene terephthalate,
Polyethylene/tetramethylene terephthalate/isophthalate, z+) ethylene/oxybenzoate, or blends thereof.

(a) yl recarbinates; especially the general formula % formula % (
5) A cargonate represented by the formula in which R3 is a hydrocarbon group having 8 to 15 carbon atoms.

For example, poly-p-xylene glycol biscarzenate, /IJ-dioxydiphenyl-methane carbinate, polydioxydiphenylethanecargenate, polydioxydiphenyl 2.2-nia'lovancarbo, *-4, /leaf Oxydiphenyl 1.1-ethanker? Nate.

(e)! Vinyl chloride resins such as vinyl chloride, vinyl chloride-butadiene copolymer, and vinyl chloride-styrene-butadiene copolymer.

(f) Vinylidene chloride resin such as vinylidene chloride-vinylidene chloride copolymer imitating vinylidene chloride-vinylpyridine copolymer.

(g) High nitrile resins such as acrylonitrile-butadiene copolymers, acrylonitrile-styrene copolymers, and acrylonitrile-styrene-butadiene copolymers with high nitrile content.

(h) Polystyrene resin, styrene-butadiene copolymer, etc.

These resins are generally formed into a film and adhered to the above-mentioned steel foil by thermal fusion, or bonded using an adhesive. Adhesives that are excellent for a wide range of thermoplastic resin films and steel foils are urethane adhesives, and for polyolefin films, acids graft-modified with ethylenically unsaturated carmenic acid or its anhydride are suitable for use with polyolefin films. Modified olefin resins can be used, and low melting copolyamides can be used as adhesives for polyamide films, and low melting copolyesters can be used for polyester films.

An organic resin paint can also be used instead of the above-mentioned thermoplastic resin film. Such paints include any protective paints consisting of thermosetting and thermoplastic resins; modified epoxy paints such as phenol-epoxy paints, amino-epoxy paints; e.g. vinyl chloride-vinyl acetate copolymers, vinyl chloride-vinyl acetate. partially saponified copolymer,
Synthesis of vinyl or modified vinyl paints such as vinyl chloride-vinyl acetate-maleic anhydride copolymers, epoxy-modified, epoxy-amino-modified, or epoxyphenol-modified vinyl resin paints; acrylic resin paints; styrene-butadiene copolymers, etc. Rubber paints and the like may be used alone or in combination of two or more.

These paints can be applied to metal materials in the form of organic solvent solutions such as enamels or lacquers, or in the form of aqueous dispersions or solutions, in the form of roller coating, spray coating, dip coating, electrostatic coating, electrophoretic coating, etc. Apply in advance. Of course, if the resin paint is thermosetting, the paint may be baked if necessary.

These resin films and paints can be used in various forms depending on the purpose and characteristics of the container. For example, if the steel foil is relatively thin and mechanical reinforcement by resin coating is desired, a resin film may be used;
If mechanical reinforcement is not so required, a coating may be used. Of course, it is also possible to apply a resin film to one surface of the steel foil and provide a coating film to the other surface, or to apply a coating film to the surface of the steel foil first and then apply a resin film on this coating film. Good too.

Furthermore, the type of resin to be used should be appropriately selected depending on the application. For example, in a container whose lid is sealed by heat sealing, the resin coating material exposed on the flange of the container,
That is, it is advantageous to use a heat-sealing resin such as an olefin resin such as polyethylene or polypropylene as the inner resin material.

Furthermore, in applications in which the filled container is subjected to heat sterilization such as retort sterilization, it is advantageous to make the inner and outer materials layers of a heat-resistant resin such as polypropylene, polyamide, or polyester.

In addition, the resin film or paint film may be transparent, but in order to hide the surface-treated steel sheet, a resin film containing a white pigment such as titanium white or other colored pigments or dyes may be used. or a coating film may be used. Alternatively, instead of using a colorant-containing resin film, a printing ink layer may be provided on the surface of the resin film, and the resin film may be laminated to the steel foil so that this printing ink layer is located on the steel foil side. .

Drawing Forming According to the present invention, the above-described laminate is subjected to drawing forming. In FIG. 3 for explaining this drawing process, the laminate 1 is drawn between an I edge 11 and a die 12, which are relatively movable in the axial direction, while being held down by a wrinkle presser 10. do. This drawing forming can be performed in one stage or in multiple stages, for example, it is performed in several stages while gradually reducing the diameters of the punch 11 and die 12 until the desired shape and desired height/diameter ratio are achieved. be able to.

At this time, according to the present invention, the drawing ratio defined by the following formula can be adjusted from 1.5 to 2 by one drawing process.
．． A remarkable feature is that seamless cup containers can be manufactured under severe conditions such that the overall drawing ratio is 1.5 to 3.5, i.e., at a high drawing ratio. .

The resulting drawn cup is subjected to a seven-lunge process, or further subjected to a curling process on the edge of the seven-lunge to form a final container. The container of the present invention can be used for sealing with a lid by heat sealing, and can also be used for sealing with a lid by seaming.

The invention is illustrated in the following examples.

Examples Throughout each example, tests and evaluations were carried out as follows. 1. Draw container formable organic coated steel foil was punched out into a disk shape of codfish with an outer diameter of 118 mm, and about 100 g of oil was added as a lubricant. After applying 1.2+9/d-, the arm punch diameter is 66 m, the punch angle radius is 3 mm, the die corner radius is 1 mm, and the clearance between the noch and the die is 1 or 2 of the plate thickness.
A hardened steel drawing tool with die diameter changed according to the plate thickness was used so that the die diameter was within the range of ~1.8 times. A flanged force horn with a cutting depth of 66 txm and a cutting depth of 32 m was molded.

・Evaluation method for 7-lunge wrinkles After drawing, visually observe the wrinkles that form near the 7-lunge on the flange and side wall, and choose O1 if there are no wrinkles at all or if there are slight wrinkles that are acceptable in terms of sealability and appearance. Cases in which wrinkles were unacceptable in terms of sealability and appearance were marked as ×.

・Evaluation method for forming condition After drawing, cracks on the side wall, abnormal bottom elongation, and poor shape were observed with the naked eye.

2. Fill the squeezed container that was successfully formed in Actual Container Storage Corrosion Resistance Test 1 with dressing tuna using the usual method, heat seal the lid made of the same material as the container, and sterilize it by heat and pressure at 116°C for 30 minutes. O stored at 37°C for 6 months - Based on actual container storage corrosion resistance test evaluation method Rust, ○: Rust area is 0 to 5%, ×: Rust area is 6%
The above film peels off, O: peeled area is θ ~ 5 inches, X: peeled area is 6
% or more and a drop resistance of 1, which was successfully formed, was filled with 10 Qcc of water, and a lid made of the same material as the container was heat-sealed. This product was dropped onto the concrete floor surface from a height of 30 cm so that the bottom corner of the container hit, and the degree of deformation was observed.

- Drop resistance rating O: No or slight deformation ×: Deformed to the extent that the commercial value is lost Example 1 Electrolytic chromic acid treated steel foil with a thickness of 30 μm and a tensile strength of 35 kpf/m' (surface film amount, :1100rtq
i'', alR-treated Quarchrome 1589/m'') for 201 hours via a 3 μm thick urethane adhesive.
Laminated with n-thick polyethylene, total thickness is 46μ
An organic resin-coated steel foil provided with an organic resin coating of m was obtained.

The organic resin-coated steel foil obtained in this way has a diameter of 66 m.

Cups with 7 runs at 32 depths were molded, and the formability of the drawn container, storage corrosion resistance test of actual containers, and drop resistance were examined. The results are shown in Table 1.

Examples 2 and 3 The thickness of the polyethylene on the inner surface of the container was 130 μm and 210 μm, respectively, and the total thickness was 151 μm and 236 μm, respectively.
Manufacturing and testing were conducted in the same manner as in Example 1 except that an organic resin coating of m was provided.

Comparative Examples 1 and 2 The thickness of the polyethylene on the inner surface of the container was 230 μm and 320 μm, and the total thickness was 256 μm and 346 μm, respectively.
Manufacturing and testing were carried out in the same manner as in Example 1, except that a μm thick organic resin coating was provided.

Example 4 Electrolytic chromic acid treated steel foil with a thickness of 30 μm and a tensile strength of 60 and 9 f/■2 (surface treatment amount, metallic chromium: J O0WI9
/@! , II! Formation: 15 ml/m”
)') An epoxy-phenol paint was applied on one side to a thickness of 5 μm after baking, and baked at 230° C. for 30 seconds.

Next, on the unpainted side K, a 25 μm thick copolyester was laminated via a 3 μm thick urethane adhesive to obtain an organic resin coated steel foil with an organic resin coating having a total thickness of 33 μm. A 7-run cup having a copolyester coating layer on the inner surface of the container was molded in the same manner as in Example 1, and the same tests as in Example 1 were conducted. Table 1 shows the results.
Shown below.

Example 5 and Comparative Examples 3 and 4 The thickness of the copolyester on the inner surface of the container was 130 μm, respectively.
, 150 μm and 260 μm, and the total thickness is
Manufacturing and testing were conducted in the same manner as in Example 4, except that organic resin waves 1 of 38 μm, 158 μm, and 268 μm were provided.

Example 6 A tin-plated steel foil with a thickness of 30 μm and a tensile strength of 85 mm (surface treatment amount, tin: 2800 Da/m”) was coated with 208 mm on one side via a 3 μm thick urethane adhesive.
℃ thick polypropylene, and the other side K.

A 208° C. thick nylon was laminated with a 3 μm thick urethane adhesive to obtain an organic resin coated steel foil with a total thickness of 46 μm.
In the same manner as in Example 1, a 7-lunged cup having a polypropylene coating layer on the inner surface of the container was molded, and the same tests as in Example 1 were conducted. The results are shown in Table 1.

Example 7 and Comparative Examples 5 and 6 The thickness of the polypropylene on the inner surface of the container was 70 μm and 9
0 μm and 130 μm, and the total thickness is 96 μm respectively.
Comparative Example 7 Example 6 except that the tensile strength of the tin-plated steel foil was 28 kgf 7 m''. Manufactured and tested in the same manner.

Example 8 Electrolytic chromic acid treated steel foil with a thickness of 75 μm and a tensile strength of 36 k17 f/m (surface treatment amount, metallic chromium: 200 μ/rP
L2. Chromium oxide: 8 da/m2) was coated with 208°C thick polysoloselene on one side through a 3 μm thick urethane adhesive, and on the other side through a 3 μm thick urethane adhesive. An organic resin-coated steel foil was obtained by laminating 208° C. thick nylon to provide an organic resin coating with a total thickness of 46 μm, and this was prepared in the same manner as in Example 1, with a polypropylene coating layer on the inner surface of the container. 7 A cup with a flange was molded, and the same test as in Example 1 was conducted. The results are shown in Table 1.

Examples 9 and 10, Comparative Examples 8 and 9 The thickness of the polypropylene on the inner surface of the container is 140 μm.

Manufacturing and testing were carried out in the same manner as in Example 8, except that the organic resin coatings were 230 μm, 260 μm, and 340 μm, and the total thicknesses were 166 μm, 256 μm, 286 μm, and 366 μm, respectively.

Example 11 Electrolytic chromic acid treated steel foil with a thickness of 75 μm and a tensile strength of 60 kgf/m2 (surface treatment amount, metallic chromium: 200 cm/m2.
An epoxy area paint was applied to one side of the chromium oxide (8 my/m") so that the thickness after baking would be 5 μm, and baked at 230°C for 30 seconds. Next, a 3 μm thick paint was applied to the unpainted side. 30μm thick through urethane adhesive.
An organic resin-coated steel foil was obtained by laminating 4 polyethylene and provided with an organic resin coating having a total thickness of 38 μm, and this was prepared in the same manner as in Example 1 to form a 72-inch cup with a polyethylene coating layer on the inner surface of the container. was molded, and the same test as in Example 1 was conducted. The results are shown in Table 1.

Example 12.13 and Comparative Example 10 The thickness of the polyethylene on the inner surface of the container was 100 μm, respectively.
150 μm and 170 μm, and the total thickness is 10 μm.
Manufacturing and testing were conducted in the same manner as in Example 11, except that organic resin coatings of 8 μm, 158 μm, and 178 μm were provided.

Example 14 Thickness: 75 thy*, tensile strength: 83 klilf/m"
Nickel-plated steel foil (surface treatment amount, metallic nickel:
15001119/m”), each with a thickness of 3 μm after drying.

Apply vinyl chloride paint to a thickness of 1 μm and heat at 200°C.
This was dried for 4 seconds to obtain an organic resin-coated steel foil with an organic resin coating having a total thickness of 4 μm, and this was treated in the same manner as in Example 1 to have a vinyl chloride paint layer with a thickness of 3 μm on the inner surface of the container. A cup with 7 runs was molded and the same test as in Example 1 was conducted. The results are shown in Table 1.

Comparative Example 11 The container was manufactured and tested in the same manner as in Example 14, except that the thickness of the vinyl chloride paint on the inner surface of the container was 1.5 μm, and the outer surface was unpainted.

Example 15 Vinyl chloride was coated on one side of the same nickel-plated steel foil as in Example 14 so that the thickness after drying was 8 μmK, and 2
It was dried at 00°C for 40 seconds. Next, polypropylene with a thickness of 100 μm was laminated on the other side via a 3 μm urethane adhesive to obtain an organic resin-coated steel foil with an organic coating having a total thickness of 111 μm. Then, a cup with a flantz having a vinyl chloride coating layer on the inner surface of the container was molded, and the same test as in Example 1 was conducted.

The results are shown in Table 1.

Comparative Examples 12 and 13 Manufacturing and testing were conducted in the same manner as in Example 15, except that the thickness of the polypropylene on the outer surface of the container was 120 μm and 160 μm, respectively.

Comparative Example 14 Tensile strength of nickel-plated steel foil is 105 kgf/em2
The manufacturing and testing were conducted in the same manner as in Example 15 except that.

Example 16 Electrolytic chromic acid treated steel foil with a thickness of 120 μm and a tensile strength of 35 and 9 f/a (surface treatment amount, metallic chromium = 50 my/m)
, chromium oxide: 2 sIITg/m"), a 204°C thick copolyester was laminated on one side with a 3 μm thick urethane adhesive, and the other side was laminated with a 3 μm thick urethane adhesive. A 20 μm polyester was laminated with an organic resin coating having a total thickness of 46 μm to obtain an organic resin coated steel foil, which was then treated in the same manner as in Example 1 to form a container with a flange having a copolyester coating layer on the inner surface. A cup was molded and tested in the same manner as in Example 1. The results are shown in Table 1.

Examples 17, 18, 19, Comparative Examples 15 and 16 The thickness of the copolyester on the inner surface of the container was 130° and 230.28°, respectively.
0,300 and 380 tlm, and the total thickness is 1 respectively.
Manufacturing and testing were conducted in the same manner as in Example 16, except that the diameter was 56.256.306.326 and 406 μm.

Example 20 Electrolytic chromic acid treated steel foil with a thickness of 120 μm and a tensile strength of 58 and 9 f/cod 2 (surface treatment amount, metal chromium: 5011197
Copolymer of vinyl chloride and vinyl acetate is coated on one side of the chromium oxide (chromium oxide: 25m9/m”) so that the thickness after drying is 3 μm, and on the other side, the thickness after drying is 1 μm.
Apply vinyl chloride paint to a temperature of 4 m at 200℃.
After drying for 0 seconds, an organic resin-coated steel foil with an organic resin coating having a total thickness of 4 μm was obtained, and in the same manner as in Example 1, a vinyl chloride/vinyl acetate copolymer coating was applied to the inner surface of the container. A cup with 7 runs was molded, and the same test as in Example 1 was conducted. The results are shown in Table 1.

Comparative Example 17 Example 2 except that the vinyl chloride and vinyl acetate copolymer coating on the inner surface of the container had a thickness of 1.5 μm, and the outer surface was unpainted.
Manufactured and tested in the same manner as 0.

Example 21 Using the same electrolytic chromic acid treated steel foil as in Example 20, vinyl chloride was coated on one side so that the thickness after drying was 8 μm.
and vinyl acetate copolymer was applied and dried at 200°C for 40 seconds. Next, 41J propylene with a thickness of 90 μm was laminated on the other side via a 3 μm urethane adhesive to obtain an organic resin coated steel foil with a total thickness of 101 μm. In the same manner as in Example 1,
A cup with 7 flanges having a copolymer coating of vinyl chloride and vinyl acetate on the inner surface of the container was molded, and the same test as in Example 1 was conducted. The results are shown in Table 1.

Example 22, Comparative Examples 18 and 19 The thickness of the polypropylene on the outer surface of the container was 170°19
0 and 280 μm, the total thickness of the organic resin coating is 18 μm, respectively.
Manufacturing and testing were conducted in the same manner as in Example 17 except that the diameters were 1,201 and 291 μm.

Example 23 Electrolytic chromic acid treated steel foil with a thickness of 120 μm and a tensile strength of 87 kgf 7 m (surface treatment amount, metal chromium: 120 Da/
m2. Chromium oxide: 10~/m2) thickness 3 on one side
Polyethylene with a thickness of 20 μm is laminated with a urethane adhesive of 3 μm in thickness, and nylon with a thickness of 20 μm is laminated on the other side with the same adhesive with a thickness of 3 μm, and an organic resin coating with a total thickness of 46 μm is provided. An organic resin-coated steel foil was obtained, and a cup with a flanse having a polyethylene layer on the inner surface of the container was formed in the same manner as in Example 1, and the same tests as in Example 1 were conducted. The results are shown in Table 1.

The thickness of the polyethylene on the inner surface of the container is 90°110 and 200 Bm, respectively, and the total thickness is 116°136 and 22°, respectively.
Manufacturing and testing were conducted in the same manner as in Example 23, except that a 6 μm thick organic resin coating was provided.

Comparative Example 22 Tensile strength of electrolytic chromic acid treated steel foil is 105 kgf/m”
Manufacturing and testing were conducted in the same manner as in Example 24 except for the following.

Example 25 Electrolytic chromic acid treated steel foil with a thickness of 75 tim and a tensile strength of 60 kgf and 71 m2 (surface treatment amount, metallic chromium: io
.

1n9/m2. A 40 μm film was applied to one side of the chromium oxide (20 my/m”) using a 3 μm thick urethane adhesive.
An organic resin-coated steel foil was obtained by laminating a thick polypropylene layer and laminating a 30 μm thick nylon layer on the other side using the same adhesive with a thickness of 3 μm, and providing an organic resin coating with a total thickness of 76 μm. A seven-lunged cup having a polypropylene layer on the inner surface of the container was molded in the same manner as in Example 1, and the same tests as in Example 1 were conducted. The results are shown in Table IK.

In Example 26, the steel foil was nickel-plated steel foil (surface treatment amount, metal nickel = 800 m9/1n2), and in Example 27, the steel foil was tin-plated steel foil (surface treatment amount, metal tin: 1000 m97 m'').

Chromium oxide: 8 Da/m2゜) In Comparative Example 23, untreated steel foil was used as the steel foil.In Comparative Example 24, chromic acid treated steel foil was used as the steel foil (surface treatment amount, metal chromium: O'IIQ/m2゜oxidation). Chromium: 5 da/m"'
) In Comparative Example 25, phosphoric acid chromic acid treated steel foil (
Surface treatment i, metal chromium: O ~/m2. Manufacturing and testing were conducted in the same manner as in Example 25, except that chromium oxide (7 ln97m") was used.

It can be seen that electrolytic chromic acid treatment, nickel plating, and tin plating treatments have significantly superior corrosion resistance values compared to no treatment, chromic acid treatment, and phosphoric acid chromic acid treatment.

[Brief explanation of drawings]

Figure 1 shows the tensile strength σB of the steel foil on the vertical axis and the thickness of the organic coating (1
) is a line diagram plotting the range of the present invention with the horizontal axis; Figure 2 is a cross-sectional view showing an example of the cross-sectional structure of the laminate used in the present invention; Figure 3 is a diagram showing an example of the cross-sectional structure of the laminate used in the present invention; It is a sectional view for explaining a process. 1 is a laminate, 2 is a steel foil, 4 and 6 are organic resin coating materials, 1
0 is a wrinkle presser, 11 is a punch, and 12 is a die. Figure 1

Claims (1)

[Claims] (1) In a method for producing a container, which involves subjecting an organic resin-coated metal foil laminate to drawing forming, the tensile strength (σ_B)
is 100 kg/mm^2≧σ_B≧30 kg/mm^2, and the thickness (T) is within the range of 120 μm≧T≧15 μm, and is provided with a surface treatment film containing metallic tin, metallic chromium, or metallic nickel. Steel foil and total thickness (t
) is T^1^/^nC/σ_B≧t≧3μm, where n is 5.6 and C is a number of 4630. How to characterize it.