JPH0487939A - Can body for canning - Google Patents

Abstract

PURPOSE:To obtain a can for canned goods having an extraordinary solid and beautiful view, easy to grip on a can body and resistant enough against hitting by a method wherein a panel and a frame exist alternately in a can axial direction and a can peripheral direction, either one of the panel and the frame is molded by squeezing and the panel and the frame are respectively positioned on a cylindrical surface the diameter of which is different from each other. CONSTITUTION:A can consists of a can body 1 and top and bottom winding parts 2a and 2b. In the can body 1, a reinforcing structure 4 is introduced in a central part, leaving non-treated cylindrical parts 3a and 3b from the top and bottom winding parts 2a and 2b. The reinforcing structure consists of a panel 5 and a frame 6. The frame 6 is a non-treated part and has the same diameter as the cylindrical parts 3a and 3b. The panel 5 is a molded part molded by squeezing and has a smaller diameter than the non-treated frame 6. A staged part 7 formed by the squeezing molding exists between the frame 6 and the panel 5. The panel 5 is square, and the frame 6 surrounds the panel 5 and extends slantwise (in a spiral direction), so that the panel 5 and the frame 6 can cross each other.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a can body for canned goods and a method for manufacturing the same, and more specifically, the present invention relates to a can body for canned goods and a method for manufacturing the same. The present invention relates to a can body for canned goods that is resistant and allows the metal material used to be made thinner.

(Prior Art) Conventionally, cans for cans are made by forming a metal plate into a cylindrical shape and joining opposing edges by means such as welding, gluing, or soldering to form a can body with side seams. A so-called three-piece can is produced by seaming both ends of the can body with a top and bottom lid, or a metal plate is drawn into a bottomed can body by deep drawing or ironing, and a lid is attached to the top end of the bottomed can body. A so-called two-piece can is used.

In these cans, many efforts have been made to reduce the thickness of the metal material as much as possible in order to reduce the cost of the metal material of the can and to reduce the weight of the can interior. However, if the thickness of the metal material is reduced,
The mechanical strength of the can body naturally decreases, and the can body becomes noticeably deformed (concave deformation) due to internal depressurization, especially during the cooling process after filling with contents or during subsequent storage and transportation. Further, in the case of canned products, collisions between cans are sometimes unavoidable during handling and transportation, and these collisions can also cause deformation of the can body.

When such deformation occurs in the can body of a canned product, the product not only has a poor appearance and loses its commercial value, but also causes coating defects such as pinholes, cracks, and peeling in the inner and outer protective coating layers of the metal plate. This may cause problems such as corrosion, metal elution, or even leakage due to pitting corrosion.

Conventionally, as a means for reinforcing a can body member, it has been known to form a bead in the circumferential direction and a bead in the can height direction in the can body member (Problem to be Solved by the Invention) Beads in the can body member Forming a bead is quite effective in preventing the above-mentioned deformation due to reduced pressure, but even if a circumferential bead is provided on the entire surface of the can body member, the deformation load due to external pressure increases (increase in external pressure deformation strength). is at most twice the size of a similar can without a bead, and is still sufficient for the purpose of completely preventing deformation due to decompression even when the metal material is made significantly thinner. In addition, if a bead is formed on the can body, the printed outer surface becomes uneven, detracting from the beauty and commercial value of the can, and coating defects also appear on the inner surface of the can. There is a drawback that metal exposure (ERV value) becomes high. For this reason,
The beaded can bodies currently in practical use only have a circumferential bead in a very limited portion of the can body.

Therefore, an object of the present invention is to introduce a new reinforcing structure to replace the conventional bead, which significantly improves the deformation strength due to external pressure (or internal depressurization), has good appearance characteristics, and has relatively little metal exposure on the inner surface of the can. To provide canning cans that are constrained to a range.

Another object of the present invention is that the outer surface of the can has a unique three-dimensional effect and aesthetic appearance based on the combined panel and frame, and that the can body is easy to grasp when drinking the contents of the can. To provide a can for canning that also has resistance to dents.

(Means for Solving the Problems) According to the present invention, at least a portion of the can body is formed with a drawn portion or an overhang portion and an unprocessed portion in a circumferential manner such that one side is a panel and the other side is a frame. The panel and the frame are each 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. Provided is a can with excellent deformation resistance, characterized in that these are arranged in alternating phases.

According to the present invention, one forming roll has a protrusion for drawing or stretch forming, and the other has a concave portion corresponding to the protrusion and a convex portion corresponding to the unprocessed portion in the relationship between the panel and the frame. The forming rolls are rotated synchronously with the can body sandwiched between them, 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 in such a manner that one side is a panel and the other side is a frame, and each of the panels and the frame is located on a cylindrical surface having a different diameter, and the panel and the frame are connected to the can body. Provided is a method for manufacturing a can body for cans with excellent deformation resistance, which is characterized in that the can bodies are formed in alternating phases on any cross section that crosses the can axial direction and the can circumferential direction.

In the can of the present invention, the drawn portion or the overhang portion constitutes a panel, the unprocessed portion constitutes a frame, the panel is located on a cylindrical surface with a small diameter, and the frame is located on a cylindrical surface with a large diameter. ” is particularly preferably located at the second position.

(Function) In the can body of the present invention, at least a portion of the can body is formed by arranging a drawn portion or an overhang portion and an unprocessed portion in a circumferential manner such that one side is a panel and the other side is a frame. The first characteristic is to let people know. In this specification, a drawn part refers to a case in which a formed part protrudes radially outward or inward via a step compared to an unprocessed part, while an overhang part refers to an unprocessed part. The molded part as a whole protrudes radially outward or radially inward, but there is no clear step like a drawn part. The relationship between a panel and a frame is clear from the wording, but for additional explanation, a frame is a framework or a mesh, and a panel is a wide area partitioned by this framework or mesh.

Therefore, the frames are connected to each other and exist continuously, but the panels are independent from each other, and a frame is always interposed between the panels. In the present invention, when the panel is a draw-formed part or an overhang-formed part, the frame is an unprocessed part, and conversely, when the frame is a draw-formed part or an overhang-formed part, the panel is an unprocessed part. Even in conventional bead-type reinforcement structures, there are already structures in which draw-formed or overhang-formed sections and unprocessed sections are provided alternately, but one in which they are provided in the relationship between the panel and the frame described above is still unknown. do not have.

Next, the second feature is that each of the panels and frames are located on cylindrical surfaces having different diameters. In general, 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 that is relatively large and a constant diameter, reduces friction scratches on the outside of the can. This is preferable in terms of preventing damage caused by scratches and dents, but conversely, it is preferable that the panel be located on a cylindrical surface with a relatively large diameter and constant diameter, while the frame be located on a cylindrical surface that is relatively small in diameter and have a constant diameter. Of course, it is also possible to be located at

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

According to the present invention, the above structural features are combined, a new reinforcing structure is introduced in place of the conventional bead, 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 to be described later, an outer diameter of 5 mm using TFS material with a plate thickness of 0.155 mm
0mm, the external pressure resistance of adhesive for can height 120mm is approximately 1
Whereas the external pressure resistance is only on the order of 2 kg/cm2, it is recognized that the external pressure resistance is improved to more than 2 kg/cm'' with the same adhesive except that the new reinforcing structure according to the present invention is introduced. The remarkable improvement in the external pressure resistance of the invention is achieved only when all of the above characteristics are combined. If the panels and frames are not alternately present but are in the same phase, no improvement in external pressure resistance can be observed.

The fact that the external pressure resistance of the can body of the present invention is significantly improved by introducing the above structure was discovered as a result of numerous experiments and measurements, and although the reason for this is not necessarily clear, , the panels and frames always exist alternately in the can axial direction and the can circumferential direction, and one of the panels and frames is a drawn part or an overhang part, and the panels and frames have different diameters. It is believed that the location on the cylindrical surface improves the bending yield stress in a constant thickness can body and prevents plastic buckling deformation.

In the can for canning of the present invention, the external pressure resistance can be significantly improved when compared with a constant thickness. As a result, it is possible to save the amount of metal materials used, reduce can manufacturing costs, reduce the weight of the container, and further improve thermal efficiency during heat sterilization.

In addition, this can has a unique three-dimensional pattern on the outside that combines a panel and a frame, giving it an aesthetic and fashionable appearance.Also, since 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 inside of the can is suppressed to a relatively small range compared to conventional bead cans. The presence of the can body makes it easy to hold the can body when drinking or drinking the contents of the can, and it also has excellent resistance to dents.

In the can of the present invention, the drawn portion or the overhang portion constitutes a panel, the unprocessed portion constitutes a frame, the panel is located on a cylindrical surface with a small diameter, and the frame is located on a cylindrical surface with a large diameter. It is particularly preferable that the
In this structure, a panel formed by drawing or stretch forming is located on a small-diameter cylindrical surface inside the unprocessed frame, so that the external pressure resistance is particularly large. Comparing the case where the panel is made to protrude outwards by drawing or stretch forming, and the case where it is made to protrude inwardly, the case where the panel is made to protrude inwardly has stronger resistance to deformation due to the reduced diameter. 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 this is combined with the effect of work hardening, resulting in a significant increase in strength. Moreover, since the area of the frame in the unprocessed part is quite small, its influence on the buckling deformation of the entire body is generally small.Thus, in this preferred embodiment, the improvement in external pressure resistance is particularly remarkable. Since the frame has a small area and consists of unprocessed parts, there is less tendency for metal exposure to occur, and it has excellent corrosion resistance.

(Example) In FIG. 1 showing an example of a can of the present invention, this can is a so-called three-piece can, and consists of a can body 1 and top and bottom seams 2a and 2b. In the can body 1, a new reinforcing structure 4 of the present invention is introduced in the center part, leaving unprocessed cylindrical parts 3a, 3b from the top and bottom seams 2a, 2b. That is, this reinforcing structure consists of a panel 5 and a frame 6. In this specific example, the flare 6 is an unprocessed part, and the cylindrical part 3
It has substantially the same diameter as a and 3b. The panel 5 is a drawn portion and is drawn to a smaller diameter than the unprocessed frame 6. A stepped portion 7 formed by drawing is present between the frame 6 and the panel 5. The panel 5 is quadrilateral, and the frame 6 surrounds the panel 5 and extends diagonally (in a spiral direction), crossing each other. Thus, in this can body, the drawn part (overhang part) and the unprocessed part are provided in the relationship that one side is a panel and the other side is a frame; each of the panel and frame is a cylindrical surface having a different diameter. and the panels and frames are arranged in a phase in which the panels and frames always alternate on any cross section that crosses the can body in the can axial direction and the can circumferential direction; are clear in each case.

In the embodiment shown in FIG. 1, the panel 5 has a rhombic shape. In the case of a rhombus, although the frame 6 has a simple arrangement extending diagonally, the adjacent circumferential arrangement and the adjacent axial arrangement of the panels have a phase difference of 1/2, resulting in an outer surface structure that is desirable in terms of strength. becomes. Of course, the panel of the present invention is not limited to the above-mentioned examples, and may take any shape such as a triangle, quadrangle, pentagon, hexagon, hexagon, other polygons, circle, ellipse, or a combination thereof. Although the panels generally have the same shape, they may be composed of 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 panels are rectangular, and not only the panels but also the frames are arranged in an adjacent circumferential direction and an adjacent axial direction with a phase difference of 1/2. B is an example in which the panel is hexagonal, and C is an example in which the panel is circular. D is an example in which a quadrangle 5a and a dodecagon 5b are combined so as to satisfy the above phase difference.

Returning to the figure again, the can body radius is the radius of the cylindrical surface on which the frame 6 is located (r), and the drawing depth of the panel (d)
is the frame cylindrical surface radius and the panel cylindrical surface #! , corresponds to the difference between the diameter and the diameter. Panel depth ratio (d/r) is 0.01 to 0.
1, particularly preferably in the range of 0.02 to 0.05. Figure 3 shows the results of measuring the withstand pressure of a can with a diameter of approximately 50 mm and a thickness of 0.2 (1 mm) by changing the drawing depth. It can be seen that it is effective in increasing d.However, d
Since an excessive increase in the value will result in a decrease in corrosion resistance, it is preferable to select the value within a certain range in consideration of the pressure resistance. In Figure 1 and Figure 1-A, the panel height (h
) and panel @(W). Panel form factor (
When h/W) is close to ], the balance of strength etc. is better, and it is generally desirable that it be in the range of 0.5 to 2.0, particularly 0.7 to 1.4. Next, there is a relationship between the panel @ (W) and the can radius (r) in relation to the strength of the can.

The number of panel repeats (n) in the circumferential direction of the can is generally preferably in the range from 4 to 30, particularly from 7 to 15. Another factor that affects can strength is the height of the panel-frame structure (L) per can height (H).
). L/H is generally in the range of 0.2 to 0.9, particularly preferably in the range of 0.4 to 0.8.

In FIG. 4 showing another example of the can of the present invention, the frame 6
is an unprocessed part, and the panel 5 is a drawn part, but the panel 5 is drawn to a larger diameter than the unprocessed frame 6. A stepped portion 7 formed by drawing is also present between the frame 6 and the panel 5.

The can of the present invention has one forming roll having a protrusion for drawing or stretch forming, four parts corresponding to the protrusion, and a convex part corresponding to the unprocessed part in the relationship between a panel and a frame. The forming rolls are rotated synchronously with the can body sandwiched between them, and at least a part of the can body is formed with a drawing part or overhang part and an unprocessed part, one part of the panel and the other part of the frame. In this relationship, each of the panels and the frame is located on a cylindrical surface having a different diameter, and the panel and the frame are always arranged alternately on any new surface that crosses the can body in the can axial direction and the can circumferential direction. It is manufactured by forming

In FIG. 5, which shows the main parts of the apparatus used in the manufacturing method of the present invention, this forming apparatus consists of a first forming roll 20 and a second forming roll 21. The first forming roll 20 has a projection ta22 for drawing or stretch forming corresponding to the panel, and the second forming roll 21
has four parts 23 corresponding to the protrusion 22 and a convex part 24 corresponding to the unprocessed part (frame). The first forming roll 20 is pivotally connected to a drive shaft 25, and includes a bearing 26a,
26b. There is a gear 2 at one end of the drive shaft.
7 is fixed. On the other hand, the near forming roll 21 is pivotally connected to a shaft 28 , and a gear 29 is fixed to one end of the shaft 28 and meshes with the gear 27 . In this way, the first forming roll 20 and the second forming roll 21 are driven and rotated at mutually synchronized speeds. A can to be formed is supplied to the second forming roll 21, supported on the first forming roll 20, meshed with the second forming roll 21, and driven and rotated at mutually synchronized speeds. The protrusion 22 of the first forming roll 20 engages with the can body to perform drawing or stretch forming, and the panel
A frame structure will be formed. After forming, the can can be easily removed from the second forming roll 21 by making the diameter of the second forming roll 21 smaller than the diameter of the can body.

-7'! Specifically, when the number of panels arranged in the circumferential direction of the can is n, and the number of protrusions on the second forming roll 21 is set to n-1, the diameter of the forming roll and the can body can be reduced. The difference can be ensured, and the can body can be easily removed after molding.

The shape of the protrusion 22 of the first forming roll 20 naturally corresponds to the shape of the panel, but from the viewpoint of preventing metal exposure on the inner surface of the can after processing, a sufficiently large radius is provided at the corner. It is preferable to keep it. FIG. 6 shows the shape of the protruding part 22 of the first forming roll 20, and this protruding part 22 passes through the panel forming working surface 30, the corner part 31, the stepped part 32, and the corner part 33, and then passes through the frame support. Although connected to the surface 34, the stepped portion 32 and the frame support surface 34
The R1 of the corner portion 33 between the two is made sufficiently large.

Generally, this R6 is preferably in the range of 0.3 to 1.0 mm. R5 is also provided at the corner portion 31 between the panel forming working surface 30 and the step portion 32, but this R2 is different from the above-mentioned R.
It may be smaller than 6 mm, and is generally in the range of 0°2 to 0.6 mm.

In the present invention, a metal plate is formed into a cylindrical shape, and a side seam is formed by welding, bonding with adhesive, soldering, etc. at opposing end lines to form a can body with openings at both ends. There are so-called three-piece cans in which the top and bottom lids are tightly tightened, and so-called two-piece cans in which a metal plate is drawn and deep-drawn or ironed to form a can body with a bottom, and a lid is wrapped around the can body. Can be applied.

The drawing or stretch forming of the outer surface of the can body may be performed on the entire surface of the can body except for the upper and lower ends of the can body or the vicinity thereof, or may be performed partially on the central portion of the can body. Of course, a plurality of them may be provided at the upper part of the can body, the center part of the can body, and the lower part of the can body. If neck-in processing is performed on the upper and lower ends of the can body, the processing is performed on the parts other than the neck-in processing parts.

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

Surface-treated steel sheets include cold-rolled steel sheets that are annealed and then subjected to secondary cold rolling, and subjected to one or more surface treatments such as galvanizing, tin plating, nickel plating, electrolytic chromic acid treatment, and chromic acid treatment. Can be used. An example of a suitable surface-treated steel sheet is an electrolytic chromic acid treated steel sheet, particularly 1
0 to 200 mg/m2 metallic chromium layer and 1 to 50 mg/m2
mg/m" (metallic chromium equivalent), and this material has an excellent combination of paint film adhesion and corrosion resistance. Other examples of surface-treated steel sheets include: 0.
This is a hard tin plate with a tin plating amount of 5 to 11.2 g/m". This tin plate is treated with romic acid or chromium i! so that the chromium content is 1 to 50 B/m2 in terms of metal chromium. !/It is desirable that phosphoric acid treatment is performed.

As the light metal plate, an aluminum alloy plate is used in addition to a so-called pure aluminum plate. Aluminum alloy plates with excellent corrosion resistance and workability have Mn: 0.2 to 1.5.
It has a composition of Ag: 0.8 to 5 weight %, Zn: 0.25 to 0.3 weight %, Cu: 0.15 to 0.25 weight %, and the balance is AI. These light metal plates also have a chromium content of 5 to 300 in terms of metal chromium.
chromic acid treatment or chromic acid/m2.
It is desirable that phosphoric acid treatment is performed.

The thickness of the metal in the can body varies depending on the type of metal, but in the case of surface-treated steel sheets, it is generally 0.08 to 0.
．． In the case of thin steel plates and aluminum plates of 24 mm, especially 0.13 to 0.17 mm, generally 0.1 to 0.4 +n
A feature of the present invention is that the present invention can be applied to a thin aluminum plate having a thickness of +n, particularly 0.14 to 0.3 mm, to produce a can having high external pressure strength.

The present invention provides that even if a protective resin coating is applied to a metal plate at any stage prior to panel-frame processing, such as the flat plate, drawing cup, or ironing cup stage, and this is applied to the processing, the protective coating is not removed. Not damaging the layers is a significant advantage. The protective coating is formed by applying a protective coating or by laminating a thermoplastic resin film.

As protective coatings, any protective coatings consisting of thermosetting and thermoplastic resins may be used, such as modified epoxy coatings such as phenol-epoxy coatings, amino-epoxy coatings, etc., such as vinyl chloride-vinyl acetate copolymers, vinyl chloride-vinyl acetate. Vinyl or modified vinyl paints such as partially saponified copolymers, vinyl chloride-vinyl acetate-maleic anhydride copolymers, epoxy-modified-epoxyamino-modified-or epoxyphenol-modified-vinyl paints Niacrylic resin paints: styrene-butadiene Synthetic rubber coatings such as copolymers may be used alone or in combination of two or more.

These paints can be applied to metals in the form of solutions in organic solvents, 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 to the material. Of course, if the resin paint is thermosetting, the paint may be baked if necessary. The protective coating film is generally 2 to 30% from the viewpoint of corrosion resistance and processability.
It is desirable to have a thickness (IA dry state) of .mu.m, especially 3 to 20 .mu.m. In addition, to improve processability,
Various lubricants can be contained in the coating film.

Thermoplastic resin films used for lamination include polyethylene, polypropylene, ethylene propylene copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic ester copolymer, olefin resin film such as ionomer: polyethylene terephthalate, polybutylene terephthalate. , polyester films such as ethylene terephthalate/isophthalate copolymers; polyamide films such as nylon 6, nylon 6.6, nylon 11, and nylon 12; polyvinyl chloride films; polyvinylidene chloride films. These films may be unstretched or biaxially stretched. Its thickness is generally 3 to 50 μm, especially 5 to 40 μm.
It is desirable to be in the μm range. The film is laminated onto the metal plate by a heat fusion method, dry lamination, extrusion coating method, etc. If the adhesiveness (heat fusion property) between the film and the metal plate is poor, for example, urethane-based Adhesives, epoxy adhesives, acid-modified olefin resin adhesives, copolyamide adhesives, copolyester adhesives, etc. can be interposed.

In the case of a three-piece can, the above-mentioned resin-coated plate is used, formed into a cylindrical shape, the edges not coated with resin are welded using a known electric resistance welding method, and the welded seam is coated with resin. , the can body. In addition, the end line can be thermally bonded using a nylon adhesive to form a can body, and the end line can be made into a can body using metal II! If 3N exists, it can also be joined by soldering.

Furthermore, the coated metal plate is subjected to drawing processing or deep drawing processing to obtain a total drawing ratio of 1.1 to 4.0, particularly 1.5 to 3.0.
A bottomed can body is manufactured within the range of , and panel-frame processing is performed on this bottomed can body. Of course, during or following deep drawing, thinning processing by bending and stretching or ironing can be performed. In this case, the degree of thinning defined by the ratio of can body thickness to can bottom thickness is 0. It may range from .05 to 0.5, especially from 0.05 to 0.4. When ironing is performed, a resin coating may be provided in advance, or a resin coating may be provided on the can body after ironing.

(Effects of the Invention) In the can body of the present invention, panels and frames always exist alternately in the can axial direction and in the can circumferential direction, and either one of the panels and the frame is formed by drawing = 25-part or stretch forming. In addition, the panel and frame are located on cylindrical surfaces with different diameters, which improves the bending yield stress in a can body of constant thickness and prevents plastic buckling deformation, thereby increasing external pressure resistance. can be significantly improved.

In the can of the present invention, the external pressure resistance can be significantly improved compared to a constant thickness, so compared to conventional outsourcing, especially vacuum cans, the thickness required to obtain a predetermined pressure resistance can be significantly improved. As a result, it is possible to save the amount of metal materials used, reduce can manufacturing costs, reduce the weight of the container, and further improve thermal efficiency during heat sterilization.

In addition, this can has a unique three-dimensional pattern on the outside that is a combination of panels and frames, giving it an aesthetic and fashionable appearance.Also, since 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 inside of the can is suppressed to a relatively small range compared to conventional beading etc.
Furthermore, due to the presence of the panel and frame, the can body is easy to hold when drinking the contents of the can, and is also highly resistant to dents.

The drawing part or the stretch forming part constitutes a panel, the unprocessed part constitutes a frame, the panel is located on a cylindrical surface with a small diameter, and the frame is located on a cylindrical surface with a large diameter. In a preferred can, a panel formed by drawing or stretch molding is located on a small diameter cylindrical surface inside the frame of the unprocessed part, so that the external pressure resistance is particularly large. 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 this is combined with the effect of work hardening, resulting in a significant increase in strength. Furthermore, since the area of the frame in the unprocessed portion is quite small, the effect this has on the overall buckling deformation, etc., is generally small. Thus, in this preferred embodiment, the improvement in external pressure resistance is particularly remarkable. In addition, since the narrow area of the frame is formed from unprocessed parts, there is little tendency for metal exposure to occur, and it has excellent corrosion resistance.

(Example) Example 1 Plate thickness 0.15 coated with epoxy paint to a thickness of 5 μm
Made by overlapping and bonding 5mm TFS materials via polyamide adhesive, the outer diameter is 50mm and the can height is approximately 120mm.
On the glued can body, mold the diamond shape (panel and frame) shown in Figure 7 at the center of the can @ (L-) about 50mm.
provided. Further, the shape had an h/w ratio of 1.0, a phase difference of 1/2, and nine pieces were arranged in a row in the circumferential direction. The forming method involved inserting the can into the inner forming roll, pressing the outer forming roll, and rotating the inner and outer forming rolls synchronously to form a diamond shape on the can body. When the depth d of the panel shown in Fig. 1 was varied from O to approximately 1.2 mm and the external pressure resistance was measured, the value exceeded 2.0 kg/c+n2 from the depth of the panel exceeding 0.6 mm. , when the panel depth is 0.7 mm, the value is approximately 2.7 kg/cm2, and the required external pressure resistance is 2.0 kg/'hm2.
It showed a strength that sufficiently exceeds that of 1.

Example 2 A can body was molded under almost the same conditions as Example 1, but the difference was that 122 diamond-shaped molds were arranged in a row in the circumferential direction as shown in Figure 8. . When the depth d of the panel was varied from 0 to approximately 1.2 mm and the external pressure resistance was measured, the value exceeded 2.0 J/cm'' from the area where the panel depth exceeded 0.6 mm. Saga 0.
At 7n+m, it showed a value of about 2.4 kg/cm2, which sufficiently exceeded the required external pressure resistance of 2.0 kg/cm2.

Example 3 A can body was molded under almost the same conditions as Example 1, but the difference was that the width of the diamond shape was 50 mm as shown in Figure 9.
This is because the number was increased from 90mn1 to 90mn1. panel depth d
When the external pressure resistance was measured by changing the depth from 0 to approximately 1.2 mm, it was found that 2.
．． The value is 0 kg/am2 or more, and the panel depth is 0.
At 7 mm, the value was approximately 2.9 kg/cm2. It has been found that the external pressure resistance is better when the width of the diamond-shaped molding is 90 mm than when it is 50 mm.

Example 4 A can body was molded under almost the same conditions as Example 1, but the difference was that six diamond-shaped molds were arranged in a row in the circumferential direction, as shown in Figure 10. . When the depth d of the panel was changed from O to 1.0 mm and the external pressure resistance was measured, it was found that when the depth of the panel was 0.8 mm, it was approximately 1', 1
kg/am2, and the required external pressure resistance, 2.
It was significantly below 0 kg/cm2.

Example 5 A can body was formed under almost the same conditions as in Example 1, but the difference was that a welded can was made by overlapping and seam welding unpainted TFS materials with a thickness of 0.35 mm. Same as Example 1 except that the original plate thickness is different, outer diameter is 50 mm, height is about 1
A 20mm can body has a diamond-shaped panel and a frame molded to a width of 50mm. When the external pressure resistance was measured, it showed a value of approximately 1.8 J/am2 at a panel depth of 0.8 mm, which is less than the required external pressure resistance of 2.0 kg/cm2, but the molding of the panel and frame. 3 in the original state (external pressure resistance 0.6 kg/cm2) without applying any treatment to the can body
It has doubled.

Comparative Example 1 Plate thickness 0.1 coated with epoxy paint to a thickness of 5 μm
A can with no panel or frame molding applied to a bonded can body with an outer diameter of 50 mm and a can height of approximately 120 mm, made by laminating and bonding 55 m + n 'L'' FS materials via polyamide adhesive. The top and bottom lids were wrapped around both ends of the body.

When external pressure was applied to this empty can and the external pressure resistance of the can body wall was measured, the value was approximately 1.0 kg/cm2, which was significantly lower than the required pressure resistance of 2.0 kg/am2.

Comparative Example 2 Plate thickness 0.20 coated with epoxy paint to a thickness of 5 μm
0mm TFS material is stacked and bonded via polyamide adhesive, and has an outer diameter of 50mm and a can height of approximately 120mm.
A top and bottom lid was wrapped around both ends of the can body, which had no panel or frame molding. In this empty can,
When external pressure was applied and the external pressure resistance of the can body wall was measured, it was approximately 1
．． ．． It shows the value of 6J/cn+2, and the required pressure resistance is 2
．． It was significantly below 0 kg/cm2.

Comparative Example 3 A can body was manufactured under the same conditions as in Example 1, and the panel and frame were placed approximately 50 mm in the center of the can body in the same direction in the can axis direction and in the can inner circumferential direction as shown in Figure 1-1. They were molded so that they were in phase, and were arranged in a series of nine pieces in the circumferential direction. For details of the formation, the ratio of 11/w is], 0, and the depth d of the panel is O.
It was changed from 1.6 mm 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 explanation of the drawing]

FIG. 1 is a side view of an example of a can for canning according to the present invention.
-A is a sectional view taken along the line A-A of the can body in FIG. Characteristic diagram of the external pressure resistance strength of empty cans when the molding ratio is changed. Figure 4 is a side view of another example of a can for cans. Figure 5 is a partial cross section of a device for forming a panel-frame on the can body. A top view, FIG. 6 is an enlarged sectional view of the protrusion of the forming roll, and FIGS. 7, 8, 9, 10 and 11 are for Example 1.2.
3 and 4 and a side view of the can bodies of Comparative Example 3. FIG. 1 is a can body, 3aA, 3b are cylindrical parts, 4 is a reinforcing structure of the present invention, 5 is a panel, 6 is a frame, 7 is a step part, 20 is a first forming roll, 21 is a second forming roll, 22 is a protrusion.

Claims (4)

[Claims] (1) At least a part of the can body is formed with a drawn part or an overhang part and an unprocessed part in a circumferential manner such that one part is a panel and the other part is a frame, and each of the panels and the frame has a diameter relative to the other. are located on different cylindrical surfaces, and the panels and frames are arranged in a phase such that the panels and frames always exist alternately on any cross section that crosses the can body in the can axial direction and the can circumferential direction. Cans for canning with excellent deformation resistance. (2) The number of panel repetitions (n) in the circumferential direction of the can is 4
3. The can body according to claim 1, wherein the can body has a diameter of 30 to 30. (3) The drawing part or the overhang forming part constitutes a panel, the unprocessed part constitutes a frame, the panel is located on a cylindrical surface with a small diameter, and the frame is located on a cylindrical surface with a large diameter. The can body according to claim 1, characterized in that: (4) One forming roll having a protrusion for drawing or stretch forming, and the other forming roll having a concave portion corresponding to the protrusion and a convex portion corresponding to the unprocessed portion in a panel and frame relationship. are rotated synchronously with the can body sandwiched between them, and at least a portion of the can body is formed with a draw-formed part or an overhang-formed part and an unprocessed part, one of which is a panel, and the other part of which is a frame. and frames are located on cylindrical surfaces having different diameters from each other, and the panels and frames are formed in phases that always alternate on any cross section that crosses the can body in the can axial direction and the can circumferential direction. A method for manufacturing a can body for canned goods with excellent deformation resistance.