JPH0678096B2 - Can body for canning - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a can body for canning and a method for producing the same, and more particularly, to an excellent canning process such as a cooling process after filling contents or a reduced pressure deformation during storage thereafter. The present invention relates to a can body for canning, which has resistance and is capable of thinning the metal material used.

(Prior Art) Conventionally, as a can for canning, a metal plate is formed into a tubular shape, and opposing edge portions are welded, joined by means such as adhesion or soldering to form a side seamed can barrel, A so-called three-piece can in which both ends of the can body are fastened to the top and bottom lid, or a metal plate is drawn into a bottomed can body and deep drawn or further ironed, and a lid is wound around the upper end of the bottomed can body. So-called two-piece cans that are tightened are used.

In these cans for canning, many efforts have been made to reduce the thickness of the metal material as much as possible for the purpose of reducing the cost of the metal material of the can and reducing the weight of the can itself. However, if the thickness of the metal material is reduced,
The mechanical strength of the can body naturally lowers, and in particular, during the cooling process after filling the contents or during the subsequent storage and transportation, the can body is significantly deformed (depression deformation) due to the reduced pressure inside. Further, in the case of a canned product, collision between cans may be unavoidable during handling or transportation, but the collision may cause deformation of the can body.

When such a deformation occurs in the can body of a canned product, the appearance of the product is deteriorated and not only the commercial value is impaired, but also coating defects such as pinholes, cracks, and peeling are also formed on the inner and outer protective coating layers of the metal plate. It may occur and cause a problem such as corrosion, metal elution, or leakage due to pitting corrosion.

Conventionally, as a means for reinforcing the can body member, it is known to form a bead in the circumferential direction and a bead in the can height direction on the can body member (problems to be solved by the invention) Although it is quite effective to prevent the above-mentioned decompression deformation and the like, even if the circumferential bead is provided on the entire surface of the can body member, the deformation load due to the external pressure increases (the external pressure deformation strength increases). Is at most about twice as much as a similar can without a bead, and even if the metal material is thinned to a large extent, the purpose of completely preventing pressure reduction deformation can still be sufficiently satisfied. Not a thing.

In addition, when a bead is formed on the can body, the printed outer surface becomes uneven, which reduces the aesthetics and commercial value of the can and also causes coating defects to appear on the inner surface of the can. There is a drawback that the ERV value) becomes high. For this reason,
The bead can bodies currently in practical use are provided with circumferential beads only in a very limited part of the can body.

Therefore, an object of the present invention is to introduce a new reinforcing structure in place of the conventional bead, to significantly improve the deformation strength by external pressure (or internal decompression), to have good appearance characteristics, and to have relatively small metal exposure on the inner surface of the can. It is to provide a can for canned products that is suppressed to a range.

Another object of the present invention is to provide a peculiar three-dimensional effect and aesthetics based on a panel and a frame based on a combination of outer surfaces of a can, and can easily hold a can barrel when drinking the contents of a can, and The object is to provide a can for cans that is also resistant to dents.

(Means for Solving the Problems) According to the present invention, at least a part of the can body is formed with a draw forming part or an overhang forming part and a non-processed part in a circumferential shape in a relation of one panel and the other frame. Each of the panel and the frame is located on a cylindrical surface having a different diameter, and the panel and the frame are arranged on an arbitrary cross section that crosses the can body in the can axial direction and the can circumferential direction. There is provided a can for canning having excellent deformation resistance, characterized in that and are always arranged in alternating phases.

According to the present invention, one of the forming rolls having a protrusion for drawing or bulging, the recess corresponding to the protrusion and the protrusion corresponding to the unprocessed portion in the panel and frame relationship are provided. The molding rolls of and are rotated synchronously with the can body being sandwiched, and at least a part of the can body is
The draw-formed part or the overhang-formed part and the unprocessed part are arranged such that one of them is a panel and the other is a frame, and each of the panel and the frame is located on a cylindrical surface having a different diameter, and the panel and the frame are A method for manufacturing a can barrel for canning having excellent deformation resistance is provided, in which the cans are formed in phases that are always present alternately on any cross section that crosses the can axis direction and the can circumference direction.

In the can of the present invention, the draw forming part or the overhang forming part constitutes a panel, the unprocessed part constitutes a frame, the panel is located on a cylindrical surface having a small diameter, and the frame is a cylindrical surface having a large diameter. It is preferably located above.

(Operation) In the can body for canning of the present invention, the draw forming part or the overhang forming part and the unprocessed part are formed in at least a part of the can body by arranging one panel and the other in a circumferential relationship in a frame relationship. The first feature is to allow it. In the present specification, the draw-formed portion means a case where a portion formed as compared with an unprocessed portion protrudes radially outward or radially inward through a step, while the overhang formed portion means an unprocessed portion. The portion formed as compared with the portion protrudes radially outward or inward as a whole, but it does not have a clear step like the draw-formed portion. Although the relationship between the panel and the frame is clearer than the wording, it can be said that the frame is a frame or mesh and the panel is a wide planar portion partitioned by the frame or mesh.

Therefore, the frames are connected to each other and continuously exist, but the panels are independent from each other, and the frames are always interposed between the panels. In the present invention, the frame is an unprocessed part when the panel is the draw forming part or the overhang forming part, and conversely, the panel is the unprocessed part when the frame is the draw forming part or the overhang forming part. Even in the conventional bead-type reinforcing structure and the like, there are already those in which the draw forming portion or the overhang forming portion and the unprocessed portion are alternately provided, but those provided in the relationship between the panel and the frame described above are still unknown. Absent.

Next, the second feature is that each of the panel and the frame is located on a cylindrical surface having a different diameter. Generally, the fact that the panel is located on a cylindrical surface with a relatively small diameter and a constant diameter, while the frame is located on a cylindrical surface with a relatively large diameter and a constant diameter, causes friction scratches on the outer surface of the can. It is preferable from the viewpoint of preventing damage caused by dents and dents, but conversely the panel is located on a cylindrical surface with a relatively large diameter and a constant diameter, while the frame is on a cylindrical surface with a relatively small diameter and a constant diameter. It is of course possible to be located at.

Finally, the third feature is that the panel and the frame are arranged so that the panel and the frame are always alternately present on any cross section that crosses the can body in the can axial direction and the can circumferential direction. is there. That is, in the can body of the present invention, in any cross section parallel to the can axis direction and any cross section parallel to the can circumferential direction, a frame protruding radially outward and a panel recessed radially inward, or The panels protruding in the radial direction and the frames recessed in the radial direction are alternately present, and only the panel or the frame does not exist on these cross sections.

According to the present invention, by combining the above structural features, a new reinforcing structure that replaces the conventional bead is introduced, and the deformation strength due to external pressure (or internal reduced pressure) can be significantly improved. For example, as shown in Examples and Comparative Examples described later, the outer pressure withstanding pressure of an adhesive can having a plate thickness of 0.155 mm and an outer diameter of 50 mm and a can height of 120 mm is only about 1 kg / cm ^2. On the other hand, in the same adhesive can except that the new reinforcing structure according to the present invention is introduced, the external pressure resistance is 2 kg / cm.
It is recognized that it will be improved to ² or more. The remarkable improvement of the external pressure resistance in the present invention is achieved only when all of the above characteristics are combined, and for example, on an arbitrary cross section that crosses the can body in the can axial direction and the can circumferential direction. Therefore, the effect of improving the external pressure resistance is not recognized at all in the case where the panel and the frame do not exist alternately and have the same phase.

In the can body of the present invention, the fact that the external pressure resistance of the can body is remarkably improved by the introduction of the above structure has been found as a result of many experiments and measurements, and the reason is not always clear. , The panel and the frame always exist alternately in the can axis direction and the can circumferential direction, and either one of the panel and the frame serves as a draw forming part or an overhang forming part, and the panel and the frame have different diameters. It is believed that the position on the cylindrical surface improves the bending yield stress in the can body of constant thickness and prevents the plastic buckling deformation.

In the can for cans of the present invention, it is possible to remarkably improve the external pressure withstanding pressure as compared with a constant thickness, so that the thickness required to obtain a predetermined withstanding pressure is significantly higher than that of a conventional external pressure can, especially a vacuum can. This can reduce the amount of metal material used, reduce the cost of can making, reduce the weight of the container, and improve the thermal efficiency during heat sterilization.

In addition, this canned can has a unique three-dimensional pattern in which a panel and a frame are combined on the outer surface, so that it has aesthetics and fashionability, and because the panel surface is relatively wide, The external printing is easy to see and the appearance characteristics are good. Moreover, since the panel surface is provided with a relatively large area, metal exposure on the inner surface of the can is suppressed to a relatively small range as compared with a conventional bead can or the like.
Further, due to the presence of the panel and the frame, the can body can be easily gripped when drinking the contents of the can and the like, and moreover, it has excellent resistance to dents.

In the can of the present invention, the draw forming part or the overhang forming part constitutes a panel, the unprocessed part constitutes a frame, the panel is located on a cylindrical surface having a small diameter, and the frame is a cylindrical surface having a large diameter. It is particularly preferred that it is located above,
In this structure, since the panel formed by drawing or bulging is located on the cylindrical surface having a small diameter inside the frame of the unprocessed portion, the external pressure resistance becomes particularly large. Comparing the case where the panel is projected outward by squeeze molding or the projection forming and the case where it is projected inward, the resistance to deformation becomes stronger when the panel is projected inward because the diameter is reduced. In this aspect of the invention, since the area of the panel is relatively large, the effect of reducing the diameter is particularly large, and the effect of work hardening is also synergistic with this, so that the strength is significantly increased. Moreover, since the area of the frame of the unprocessed portion is quite small, the influence on the buckling deformation of the whole is generally small. Thus, in this preferred embodiment, the improvement of the external pressure resistance is particularly remarkable. Further, since the frame having a small area is composed of the unprocessed portion, the metal exposure is less likely to occur and the corrosion resistance is excellent.

(Example) In FIG. 1 showing an example of a can of the present invention, this can is a so-called three-piece can, which comprises a can body 1 and top and bottom winding portions 2a and 2b. In the can body 1, the new reinforcing structure 4 of the present invention is introduced in the central portion of the can body 1 leaving the unprocessed cylindrical portions 3a, 3b from the top and bottom winding portions 2a, 2b. That is, this reinforcing structure is the panel 5
And frame 6. In this example,
The frame 6 is an unmachined portion and has a diameter substantially the same as that of the cylindrical portions 3a and 3b. The panel 5 is a draw-molded portion and has a diameter smaller than that of the unprocessed frame 6. A step portion 7 formed by drawing is present between the frame 6 and the panel 5. The panel 5 is a quadrangle, and the frame 6 surrounds the panel 5 and extends in a diagonal direction (spiral direction) while crossing each other. Thus,
In this can body, the draw forming part (overhang forming part) and the unprocessed part are provided so that one side is a panel and the other side is a frame; each of the panel and the frame is on a cylindrical surface having a different diameter from each other. That they are located; and that the panel and frame are arranged in a phase in which the panel and the frame always alternate on any cross section that traverses the can body in the can axial direction and the can circumferential direction. Is.

In the specific example shown in FIG. 1, the panel 5 has a diamond shape. In the case of a rhombus, although the frame 6 has a simple arrangement extending in an oblique direction, the circumferential arrangement adjacent to the panel and the axial arrangement adjacent to the panel have a phase difference of 1/2, and an outer surface structure desirable for strength. Becomes Of course, the panel of the present invention is not limited to the above-mentioned example, and may have any shape such as a triangle, a quadrangle, a pentagon, a hexagon, an octagon, other polygons, a circle, an ellipse, or a combination thereof. Generally, the panels have the same shape, but they may be a combination of two or more panels having different shapes. FIG. 2 shows some examples of panel and frame shapes. A is an example in which the panel has a quadrangular shape, and not only the panel but also the frame are adjacent to each other in the circumferential direction and adjacent to each other in the axial direction, and the phase difference is 1/2. B is an example where the panel is hexagonal, and C is an example where the panel is circular. D is an example in which the quadrangle 5a and the dodecagon 5b are combined so as to satisfy the phase difference.

Referring back to FIG. 1 again, the can body radius is the radius (r) of the cylindrical surface on which the frame 6 is located, and the drawing depth (d) of the panel corresponds to the difference between the frame cylindrical surface radius and the panel cylindrical surface radius. To do. Panel depth ratio (d / r) is 0.01 to 0.1, especially 0.02 to
It is preferably in the range of 0.05. FIG. 3 shows the results of measuring the pressure resistance of a can with a diameter of about 50 mm and a thickness of 0.20 mm by changing the drawing depth. From this result, it is understood that the increase of the drawing depth is effective for the increase of the proof pressure.
However, since an excessive increase of d brings about a decrease in corrosion resistance, it is preferable to select a certain range in consideration of the withstand pressure. In FIGS. 1 and 1-A, there is a relationship between the panel height (h) and the panel width (w) as a shape factor of the panel. When the panel shape factor (h / w) is close to 1, the balance of strength and the like is better, generally 0.5 to 2.0, especially 0.7 to 1.4.
It is desirable to be in the range of. Next, there is a relationship between the panel width (w) and the can radius (r) in relation to the strength of the can. The number of repetitions (n) of the panel in the circumferential direction of the can is generally 4 to
It is preferably in the range of 30, especially 7 to 15. Another factor that affects the strength of the can is the height of the can (H).
There is a ratio of panel-frame structure height (L) per hit. L / H should generally be in the range of 0.2 to 0.9, especially 0.4 to 0.8.

In FIG. 4 showing another example of the can of the present invention, a frame 6
Is a non-processed part, and the panel 5 is a draw forming part, but the panel 5 has a larger diameter than the unprocessed frame 6. A step portion 7 formed by drawing is also present between the frame 6 and the panel 5.

The can of the present invention includes one forming roll having a protrusion for drawing or bulging, a recess corresponding to the protrusion and a protrusion corresponding to an unprocessed portion in a panel and frame relationship. The forming roll is rotated in synchronism with the can body being sandwiched, and at least a part of the can body has a draw forming part or an overhang forming part and an unprocessed part, one of which is a panel and the other of which is a frame. , The panels and the frames are respectively located on cylindrical surfaces having different diameters, and the panels and the frames are formed in phases that are always alternately present on any cross section that traverses the can body in the can axial direction and the can circumferential direction. It is manufactured by

In FIG. 5, which shows the main part of the apparatus used in the manufacturing method of the present invention, this molding apparatus comprises a first molding roll 20 and a second molding roll 21. First forming roll 20
Has a projection portion 22 for drawing or bulging corresponding to the panel, and the second forming roll 21 has the projection portion 22.
It has a concave portion 23 corresponding to 22 and a convex portion 24 corresponding to an unprocessed portion (frame). The first forming roll 20 has a drive shaft 25.
And is supported by bearings 26a and 26b. A gear 27 is fixed to one end of the drive shaft. on the other hand,
The second forming roll 21 is pivotally attached to a shaft 28, and a gear 29 is fixed to one end of the shaft 28 and meshes with the gear 27.
Thus, the first forming roll 20 and the second forming roll 21 are driven and rotated at the speeds synchronized with each other. The can to be molded is supplied to the second forming roll 21, the can is supported on the first forming roll 20, meshes with the second forming roll 21, and is driven and rotated at a speed synchronized with each other. The projection 22 of the first forming roll 20 is engaged with the can body to perform draw forming or stretch forming, thereby forming a panel-frame structure. The removal of the molded can from the second molding roll 21 is easily performed by making the diameter of the second molding roll 21 smaller than the diameter of the can body. More specifically, when the number of panels provided in the circumferential direction of the can is n, if the number of protrusions of the second forming roll 21 is n-1, the diameter of the forming roll and the diameter of the can body can be reduced. The difference between
The can body can be easily removed after molding.

The shape of the projection 22 of the first forming roll 20 corresponds to the shape of the panel, of course, but from the viewpoint of preventing metal exposure on the inner surface of the can after processing, a sufficiently large R is taken at the corner. It is preferable to keep. Figure 6 shows the first forming roll
The shape of the projection 22 of 20 is shown, and the projection 22 is connected to the frame support surface 34 through the panel molding action surface 30, the corner 31, the step 32 and the corner 33. Of the corner 33 between the step 32 and the frame supporting surface 34
Make R _d large enough. Generally, this R _d should be in the range of 0.3 to 1.0 mm. Panel forming working surface 30 and step 32
R _f is also provided in the corner portion 31 between and, but this R _f is
It may be smaller than R _d and is generally in the range of 0.2 to 0.6 mm.

According to the present invention, a metal plate is formed into a cylindrical shape, side end seams are formed by welding the opposite end line portions by welding, bonding with an adhesive or soldering, and a can body with both ends opened. A so-called canned piece with a lid tightened, or a metal plate is drawn and deep drawn or further ironed to form a bottomed can body.
This can be applied to a so-called two-piece can in which a lid is wound around the can body.

The drawing or bulging of the outer surface of the can body may be performed on the entire surface of the can body except at the upper and lower ends of the can body or in the vicinity thereof, or may be partially performed at the center of the can body. Of course, a plurality of can bodies may be provided at the top of the can body, the center of the can body, and the bottom of the can body. When neck-in processing is performed on the upper and lower ends of the can body, processing is performed on the portion excluding the neck-in processing portion.

In the present invention, various surface-treated steel plates and light metal plates such as aluminum are used as the metal plate.

As the surface-treated steel sheet, a cold-rolled steel sheet is annealed and then secondary cold-rolled, and one or more surface treatments such as zinc plating, tin plating, nickel plating, electrolytic chromic acid treatment, and chromic acid treatment are performed. Can be used. An example of a suitable surface-treated steel sheet is an electrolytic chromic acid-treated steel sheet, especially 10
To 200 mg / m ² metal chrome layer and 1 to 50 mg / m ² (metal chrome equivalent) chrome oxide layer, which has excellent combination of coating adhesion and corrosion resistance. ing. Another example of the surface-treated steel plate is a hard tin plate having a tin plating amount of 0.5 to 11.2 mg / m ² . This tin plate is
It is desirable that the chromic acid treatment or the chromic acid / phosphoric acid treatment is performed so that the chromium amount becomes 1 to 50 mg / m ^{2 in} terms of metallic chromium.

As the light metal plate, an aluminum alloy plate is used in addition to a so-called pure aluminum plate. Aluminum alloy sheets with excellent corrosion resistance and workability are Mn: 0.2 to 1.5% by weight, M
g: 0.8 to 5% by weight, Zn: 0.25 to 0.3% by weight, and Cu: 0.
It has a composition of 15 to 0.25% by weight and the balance being Al. These light metal plates are also preferably subjected to chromic acid treatment or chromic acid / phosphoric acid treatment so that the amount of chromium becomes 5 to 300 mg / m ^{2 in} terms of metal chromium.

The thickness of the metal in the can body varies depending on the type of metal, but in the case of surface-treated steel plate, it is generally 0.08 to 0.24 m.
m, particularly 0.13 to 0.17 mm thin steel plates, and in the case of aluminum plates, the present invention can be applied to thin aluminum plates of generally 0.1 to 0.4 mm, particularly 0.14 to 0.3 mm, to obtain a can having high external pressure strength. Is a feature of the present invention.

The present invention provides a protective coating of a resin on a metal plate at any stage prior to panel-frame processing, such as a flat plate, a squeeze cup or an ironing cup, even if the resin is applied to the processing. It is a significant advantage not to damage the layers. The protective coating is formed by providing a protective coating or laminating a thermoplastic resin film.

As the protective coating, any protective coating composed of thermosetting and thermoplastic resins: modified epoxy coating such as phenol-epoxy coating, amino-epoxy coating, etc .: vinyl chloride-vinyl acetate copolymer, vinyl chloride-vinyl acetate Copolymer partially saponified product, vinyl chloride-vinyl acetate-maleic anhydride copolymer, epoxy-modified-, epoxyamino-modified- or epoxyphenol-modified-vinyl or modified vinyl paint such as vinyl paint: acrylic resin paint: styrene -Synthetic rubber-based paints such as butadiene-based copolymers are used alone or in combination of two or more.

These paints are applied in the form of an organic solvent solution such as enamel or lacquer, or in the form of an aqueous dispersion or aqueous solution, in the form of roller coating, spray coating, dip coating, electrostatic coating, electrophoretic coating, etc. Apply to the material. Of course, when the resin paint is thermosetting, the paint is baked if necessary. The protective coating is generally 2 to 30μ from the viewpoint of corrosion resistance and workability.
It is desirable to have a thickness (dry state) of m, especially 3 to 20 μm. Further, in order to improve the processability, various lubricants can be contained in the coating film.

As the thermoplastic resin film used for lamination, polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic ester copolymer, olefin polymer film such as ionomer: polyethylene terephthalate, polybutylene Examples thereof include polyester films such as terephthalate and ethylene terephthalate / isophthalate copolymer: polyamide films such as nylon 6, nylon 6,6, nylon 11 and nylon 12: polyvinyl chloride film: polyvinylidene chloride film. These films may be unstretched or biaxially stretched.
The thickness is preferably in the range of 3 to 50 μm, particularly 5 to 40 μm. The film is laminated on the metal plate by a heat fusion method, a dry lamination method, an extrusion coating method, or the like. In the case where the adhesiveness (heat fusion property) between the film and the metal plate is poor, for example, a urethane type is used. An adhesive, an epoxy adhesive, an acid-modified olefin resin adhesive, a copolyamide adhesive, a copolyester adhesive or the like can be interposed.

In the case of a three-piece can, the above resin-coated plate is used, and this is molded into a tubular shape, the resin-uncoated edge is welded by an electric resistance welding method known per se, and the welding seam is coated with resin. , The can body. Further, the end line portion can be heat-bonded via a nylon adhesive to form a can body, and when a metal tin layer is present at the end edge portion, it can be joined by soldering.

Further, the coated metal plate is subjected to drawing or deep drawing to produce a bottomed can body having a total drawing ratio of 1.1 to 4.0, particularly 1.5 to 3.0, and a panel for the bottomed can body. -Perform frame processing. Of course, during deep drawing or subsequent to this, thinning processing by bending and stretching or ironing processing can be performed. In this case, the degree of thinning defined by the ratio of can body thickness / can bottom thickness is 0.05. It can be in the range of 0.5 to 0.5, particularly 0.05 to 0.4. When performing ironing, a resin coating may be provided in advance, or a resin coating may be provided on the can body after the ironing.

(Effect of the Invention) In the can body of the present invention, the panel and the frame are always present alternately in the can axis direction and the can circumferential direction, and either one of the panel and the frame serves as a draw forming part or an overhang forming part. In addition, since the panel and the frame are located on the cylindrical surfaces having different diameters, the bending yield stress in the can body of a constant thickness is improved, and the plastic buckling deformation is prevented,
As a result, the external pressure resistance can be significantly improved.

In the can for cans of the present invention, it is possible to remarkably improve the external pressure withstanding pressure as compared with a constant thickness, so that the thickness required to obtain a predetermined withstanding pressure is significantly higher than that of a conventional external pressure can, especially a vacuum can. This can reduce the amount of metal material used, reduce the cost of can making, reduce the weight of the container, and improve the thermal efficiency during heat sterilization.

In addition, this canned can has a unique three-dimensional pattern in which a panel and a frame are combined on the outer surface, so that it has aesthetics and fashionability, and because the panel surface is relatively wide, The external printing is easy to see and the appearance characteristics are good. Moreover, since the panel surface is provided with a relatively large area, metal exposure on the inner surface of the can is suppressed to a relatively small range as compared with a conventional bead can or the like.
Further, due to the presence of the panel and the frame, the can body can be easily gripped when drinking the contents of the can and the like, and moreover, it has excellent resistance to dents.

The draw forming part or the overhang forming part constitutes a panel, the unprocessed part constitutes a frame, the panel is located on a cylindrical surface having a small diameter, and the frame is located on a cylindrical surface having a large diameter. In a preferred can, the external pressure resistance becomes particularly large because the panel formed by drawing or bulging is located inside the frame of the unprocessed portion on the cylindrical surface of the small diameter. In this aspect of the present invention, since the area of the panel is relatively large, the effect of reducing the diameter is particularly large, and the effect of work hardening is also synergistic with this, so that the strength is significantly increased. Moreover, since the area of the frame of the unprocessed portion is quite small, the influence on the buckling deformation of the whole is generally small. Thus, in this preferred embodiment, the improvement of the external pressure resistance is particularly remarkable. Further, since the frame having a small area is composed of the unprocessed portion, the metal exposure is less likely to occur and the corrosion resistance is excellent.

(Example) Example 1 A board thickness of 0.155 mm obtained by applying an epoxy-based paint to a thickness of 5 μm.
Adhesive can barrel with an outer diameter of about 50 mm and a can height of about 120 mm, which is made by stacking and joining via a TFS material polyamide adhesive,
Mold the diamond shape (panel and frame) shown in the figure,
A width (L-) of about 50 mm was applied almost in the center. The shape is h /
The ratio of w is 1.0 and the phase difference is 1/2, and 9 pieces are arranged in the circumferential direction. As the forming method, the can was inserted into the inner surface side forming roll, the outer surface side forming roll was pressed, and the inner and outer surface side forming rolls were synchronously rotated to form a diamond shape on the can body. When the depth d of the panel shown in Fig. 1 was changed from 0 to about 1.2 mm and the external pressure resistance was measured, the depth of the panel was 0.
The value is 2.0 kg / cm ² or more from around 6 mm, and shows a value of about 2.7 kg / cm ² when the panel depth is 0.7 mm, and the strength exceeds the required external pressure proof pressure, 2.0 kg / cm ^2. showed that.

Example 2 A can body is molded under substantially the same conditions as in Example 1, but the difference is that twelve diamond-shaped moldings are arranged in a row in the circumferential direction as shown in FIG. Panel depth d
When the external pressure resistance was measured by changing the value from 0 to about 1.2 mm, the value was 2.0 kg / cm ² or more when the depth of the panel exceeded 0.6 mm, and about 2.4 kg when the depth of the panel was 0.7 mm. The value of / cm ² was shown, and the required external pressure proof pressure and the strength sufficiently exceeding 2.0 kg / cm ² were shown.

Example 3 A can body is molded under substantially the same conditions as in Example 1, except that the width of the diamond-shaped molding is increased from 50 to 90 mm as shown in FIG. When the depth d of the panel was changed from 0 to about 1.2 mm and the external pressure resistance was measured, it was 2.0 kg / cm ² or more when the depth of the panel exceeded 0.6 mm, and the depth of the panel was 0.7. In mm, the value was about 2.9 kg / cm ² . It was found that the diamond-shaped forming width of 90 mm was superior to 50 mm in external pressure resistance.

Example 4 A can body is molded under substantially the same conditions as in Example 1, but the difference is that, as shown in FIG. 10, six diamond-shaped moldings are arranged in a row in the circumferential direction. . When the panel depth d was changed from 0 to about 1.0 mm and the external pressure withstand pressure was measured, when the panel depth was 0.8 mm, the value was about 1.1 kg / cm ² , and the required external pressure withstand pressure was 2.0 kg. Significantly below / cm ² .

Example 5 A can body is formed under substantially the same conditions as in Example 1, but the difference is that the unpainted TFS material having a plate thickness of 0.35 mm is overlapped and seam welded. Similar to Example 1 except that the original plate thickness is different, a can body having an outer diameter of about 50 mm and a height of about 120 mm is formed with a diamond-shaped panel and a frame with a width of 50 mm. When the outer pressure resistance was measured, the depth of the panel was 0.
It shows a value of about 1.8 kg / cm ² at 8 mm, and the required external pressure proof pressure 2.
It is less than 0kg / cm ² , but it is in its original condition without the panel and frame being molded on the can body (external pressure resistance of 0.6kg / cm ² ).
3 times the

Comparative Example 1 Epoxy-based paint applied to a thickness of 5 μm 0.155 mm
The TFS material is laminated and joined via a polyamide adhesive on the can body of an adhesive can with an outer diameter of about 50 mm and a can height of about 120 mm.
The top and bottom lids were wrapped around both ends of the can body without any panel or frame forming. When an external pressure was applied to this empty can to measure the external pressure resistance of the can body wall, it showed a value of about 1.0 kg / cm ² , which was far below the required pressure resistance of 2.0 kg / cm ² .

Comparative Example 2 Epoxy paint applied to a thickness of 5 μm 0.200 mm thick
The TFS material is laminated and joined via a polyamide adhesive on the can body of an adhesive can with an outer diameter of about 50 mm and a can height of about 120 mm.
The top and bottom lids were wrapped around both ends of the can body without any panel or frame forming. When an external pressure was applied to this empty can to measure the external pressure resistance of the can body wall, it showed a value of about 1.6 kg / cm ² , which was far below the required pressure resistance of 2.0 kg / cm ² .

Comparative Example 3 A can body was manufactured under the same conditions as in Example 1, and the panel and frame were approximately 50 mm wide at approximately the center of the can body, and the panel and frame were in the same phase in the can axial direction and the can circumferential direction as shown in FIG. Were formed so that nine pieces were arranged in the circumferential direction. The details of the formation were such that the h / w ratio was 1.0 and the panel depth d was changed from 0 to 1.6 mm. When the external pressure resistance of the can was measured, no effect of improving the external pressure resistance was observed regardless of the depth d of the panel.

[Brief description of drawings]

FIG. 1 is a side view of an example of a can for can according to the present invention, FIG. 1-A is a sectional view taken along the line AA of the can barrel of FIG. 1, and FIG. 2 is a panel-frame shape of the can for can according to the present invention. Fig. 3 is a partial development view showing several examples of the above. Fig. 3 is a characteristic diagram of the external pressure resistance strength of an empty can when the drawing ratio of the can for cans is changed, and Fig. 4 is a side view of another example of the can for cans. FIG. 5 is a partial cross-sectional top view of an apparatus for forming a panel-frame on a can body, and FIG. 6 is an enlarged cross-sectional view of a protrusion of a forming roll, FIG. 7, FIG. 8, FIG. 9, and FIG. 11 and 11 are side views of the can bodies of Examples 1, 2, 3 and 4 and Comparative Example 3. 1 is a can body, 3aA and 3b are cylindrical parts, 4 is the reinforcing structure of the present invention,
5 is a panel, 6 is a frame, 7 is a stepped portion, 20 is a first forming roll, 21 is a second forming roll, and 22 is a protrusion.

Claims (4)

[Claims] 1. A draw forming part or an overhang forming part and an unprocessed part are formed on at least a part of a can body in a circumferential shape in a relation of a panel on one side and a frame on the other side, and each of the panel and the frame is formed. The panels and the frames are located on cylindrical surfaces having different diameters, and the panels and the frames are arranged in a phase in which the panels and the frames always exist alternately on an arbitrary cross section that crosses the can body in the can axial direction and the can circumferential direction. A can for cans with excellent deformation resistance. 2. The can body according to claim 1, wherein the number of repetitions (n) of the panel in the circumferential direction of the can is 4 to 30. 3. A draw forming part or an overhang forming part constitutes a panel, an unprocessed part constitutes a frame, the panel is located on a cylindrical surface having a small diameter, and the frame is on a cylindrical surface having a large diameter. It is located at
The can body described. 4. A molding roll having one projection roll for drawing or bulging, a recess corresponding to the projection, and a projection corresponding to an unprocessed portion in a panel-frame relationship. The roll is rotated in synchronism with the can body being sandwiched, and at least a part of the can body has a draw forming part or an overhang forming part and a non-processed part, one of which is a panel and the other of which is a frame, Each of the panel and the frame is located on a cylindrical surface having a different diameter from each other, and the panel and the frame are formed in a phase which is always present alternately on any cross section that traverses the can barrel in the can axial direction and the can circumferential direction. A method for manufacturing a can body for canning, which is excellent in deformation resistance.