JP6439354B2 - Metal can having polyhedral wall and method of forming the same - Google Patents

Description

  The present invention relates to a metal can having a high-strength polyhedron wall in a body portion and a forming method thereof.

Conventionally, as this type of metal can, for example, the one described in Patent Document 1 is known, and its body portion is composed of a large number of unit panels divided by convex boundary ridge lines. A circumferential polyhedral wall is provided. This polyhedral wall has a configuration in which panel rows of a predetermined number of unit panels arranged in the can axis direction are densely arranged on the entire circumference, and the phase in the can axis direction of each unit panel in the adjacent panel row is the unit panel's phase. Each unit panel of the other panel row is densely inserted between each unit panel constituting one panel row of adjacent panel rows, shifted by half the axial length.
Thus, the strength is increased by making the body portion a polyhedral wall, and the thickness and weight are reduced without impairing the strength.

  On the other hand, such a three-dimensional shape pattern composed of a large number of unit panels has a decorative effect. In particular, the large number of unit panels reflect light and shine brightly, and have a unique aesthetic appearance. It was.

JP-A-8-26286

However, the shape and size of the unit panel of the polyhedral wall are determined by the strength design, the manufacturing process, etc., and the degree of freedom in design is small and the decoration effect cannot be changed.
The present invention has been made in view of the circumstances as described above, and its purpose is to ensure a certain strength without changing the shape and size of the unit panel, and to change the decoration effect. An object of the present invention is to provide a metal can having a polyhedral wall and a method for forming the same.

In order to achieve the above object, in the metal can according to the present invention,
The body portion has a circumferential polyhedral wall at least in a can axis direction, the polyhedral wall is divided by a convex boundary ridge line, and a region surrounded by the boundary ridge line is recessed toward the inside of the body portion. A metal can composed of a number of unit panels,
A part of the circumferential polyhedral wall is a raw region where the raw body peripheral surface remains ,
Information on a character, a symbol, or a pattern is displayed on the circumferential polyhedral wall by the unprocessed region .

In the present invention, it is preferable to adopt the following form.
(1) The unprocessed area is arranged in an area corresponding to an arrangement area of at least one unit panel in the polyhedral wall;
(2) The raw region is separated from the unit panel at a boundary ridge line of the unit panel adjacent to the raw region in the circumferential direction;
(3) The unprocessed region is provided in the middle portion of the circumferential polyhedral wall in the can axis direction,
(4) The raw region is connected to a raw body peripheral surface adjacent to the circumferential polyhedral wall at at least one end in the can axis direction of the circumferential polyhedral wall ;
(5 ) being positioned relative to each other so that the display portion provided on the printing surface is positioned in the unprocessed area;
( 6 ) The display unit is a barcode.

Further, as another means for achieving the above object, a partial polyhedral wall composed of a plurality of unit panels is formed in the circumferential direction of the body portion, and the periphery of the partial polyhedral wall is an unprocessed body portion. The peripheral surface is an unprocessed region, and information on characters, symbols, or patterns is displayed by the partial polyhedral wall. Further, in the present invention, a circumferential polyhedral wall having a large number of unit panels divided by convex boundary ridge lines at least partially in the can axis direction of the body part, and partially in the circumferential direction of the body part Preferably, the partial polyhedral wall is provided.

  Further, as another means for achieving the above object, the body has a circumferential polyhedral wall at least in a portion of the can axis direction, and the polyhedral wall is divided into a plurality of convex boundary ridge lines. In the metal can composed of unit panels, the concave shapes of the plurality of unit panels are of a plurality of types.

Further, the metal can forming method according to the present invention includes a metal can body sandwiched between an inner mold and an outer mold, and a plurality of unit panel boundaries with respect to the body section by ridges provided on the inner mold. It is a molding method in which the unit panel is molded by inwardly folding a ridge line and indenting a region surrounded by the ridge line ridge inwardly by a recess ridge provided in the outer mold,
The outer mold has a flat part that does not interfere with the body part on a part of the surface, and sandwiches the body part between the inner mold and the outer mold so that an unprocessed region is formed on a part of the body part. The remaining polyhedral wall is formed.

According to the above-described present invention, by providing the unprocessed region, it is possible to change the reflection of light, to give a monotonous shape with an accent, and to improve the decoration. Further, by providing the unprocessed area in part, the degree of reduction in the strength of the can is small as compared with the case where the unprocessed area is not provided.
Also, by providing an unprocessed area in a part of the polyhedral wall, the amount of processing of the body part can be reduced compared to the case where a unit panel is provided over the entire circumference, and the body part (especially the inner surface side) Damage to the body) can be suppressed.

It is the schematic which shows the metal can which concerns on Example 1, (a) is a side view, (b) is AA sectional drawing of (a). 6 is a schematic diagram showing a metal can 1 of Example 2. FIG. 6 is a schematic diagram showing a metal can 1 of Example 2. FIG. 6 is a schematic view showing a metal can 1 of Example 3. FIG. 6 is a schematic view showing a metal can 1 of Example 4. FIG. 6 is a schematic view showing a metal can 1 of Example 4. FIG. 6 is a schematic view showing a metal can 1 of Example 5. FIG. 6 is a schematic view showing a metal can 1 of Example 6. FIG. It is the schematic which shows the metal can 1 of Example 7, (a) is a side view, (b) is BB sectional drawing of (a), (c) thru | or (f) is sectional drawing which shows a modification. is there. It is a figure which shows the metal can of a comparative example, (a) is a side view, (b) is CC sectional drawing of (a). In Example 1 thru | or 7, the shaping | molding machine which processes the polyhedron wall of the metal can of this invention is shown, The schematic perspective view which a part of trunk | drum of the metal can attached to the inner mold was hollowed out, and the inner mold was exposed It is. In Example 1 thru | or 7, it is a cross-sectional schematic diagram for can axis | shaft direction for demonstrating the state which the inner mold | type and an outer mold | die are pressing in order to form a polyhedral wall, (a) is a unit panel A continuously formed portion, (b) shows a remaining portion of the unprocessed region.

  DETAILED DESCRIPTION Exemplary embodiments for carrying out the present invention will be described in detail below with reference to the drawings. However, the dimensions, materials, shapes, and relative arrangements of the components described in this embodiment should be appropriately changed according to the configuration of the apparatus to which the invention is applied and various conditions. It is not intended to limit the scope to the following embodiments.

Example 1
Example 1 will be described below.
Drawing 1 is a schematic diagram showing metal can 1 concerning this example, (a) is a side view and (b) shows an AA sectional view of (a). FIG. 10 is a view showing a metal can 100 of a comparative example.
In order to describe the metal can 1 of the present embodiment, first, the metal can 100 of the comparative example will be described. For convenience of explanation, in the metal can 100 of the comparative example and the metal can 1 of the present embodiment, the same reference numerals denote the same components. Moreover, in the following description, the can axis direction means the height direction of the metal can, and is indicated by H in FIGS.

The metal can 100 includes a bottomed cylindrical body 2 and a can lid 3 that is fastened and fastened to the upper end opening of the body 2. The metal can 100 is at least in the can axis direction of the body 2. A circumferential polyhedral wall 400 is provided in part.
The polyhedral wall 400 includes a large number of unit panels 5 divided by convex boundary ridge lines 51, and more specifically, a predetermined number of unit panels 5 arranged in the can axis direction (height direction). Panel rows 50 are arranged densely all around. Further, the region surrounded by the boundary ridge line 51 of the unit panel 5 is provided with a valley line 52 along a horizontal diagonal line, and the upper triangle portion 53 and the lower triangle portion 54 are bent with the valley line 52 as a boundary. It has a concave shape that is recessed in the axial direction of the diagonal line (inward of the body). In addition, a position where the plurality of boundary ridge lines 51 intersect is an intersecting portion 55.

  Further, the unit panel 5 has a rhombus shape, and the phase in the can axis direction of each unit panel 5 in the adjacent panel row 50 is shifted by half of the length in the can axis direction of the unit panel 5. Each unit panel 5 in the other panel row 50 is densely inserted between each unit panel 5 constituting the panel row 50.

Next, the metal can 1 of the present embodiment will be described in detail with reference to FIG.
The metal can 1 of the present embodiment is a two-piece can, and is composed of a bottomed cylindrical body 2 and a can lid 3 that is fastened and fixed to the upper end opening of the body 2, and at least a part of the body 2. A circumferential polyhedral wall 4 is formed.
The polyhedral wall 4 is divided by convex boundary ridge lines 51, and a plurality of unit panels 5 (about the shape, arrangement, etc.) in which the region surrounded by the boundary ridge lines is recessed toward the inside of the trunk centering on the valley line 52. Is the same as described above, and is omitted).

The unprocessed region 6 is a region where the peripheral surface of the body portion 2 of the metal can 1 remains without being subjected to processing for forming the unit panel 5 when the polyhedral wall 4 is formed. When the polyhedral wall 400 (comparative example) is formed, the unit wall 5 is provided in one of the regions where the unit panel 5 was disposed. In the present embodiment, the unprocessed region 6 is arranged in a region corresponding to the arrangement region of the four unit panels 5 in the substantially middle portion (midway portion in the can axis direction) of the polyhedral wall 4 and the region of FIG. As shown in A, a boundary ridge line 51 of the unit panel 5 adjacent to the unprocessed region 6 in the circumferential direction is divided from the unit panel 5.

With the above configuration, the reflection of light can be changed to give an accent to a monotonous shape, and the decorativeness can be improved. Further, by providing the unprocessed area in part, the degree of reduction in the strength of the can is small as compared with the case where the unprocessed area is not provided.
Also, by providing an unprocessed area in a part of the polyhedral wall, the amount of processing of the body part can be reduced compared to the case where a unit panel is provided over the entire circumference, and the body part (especially the inner surface side) Damage to the body) can be suppressed.

  The unprocessed area 6 may be arranged in an area corresponding to the arrangement area of one unit panel 5 in the polyhedral wall 4. Further, in the polyhedral wall 4 according to the present invention, the arrangement of the unit panel 5 and the unprocessed region 6 is not limited to the above embodiment, and the unit panel 5 and the unprocessed region 6 may be appropriately combined and disposed. it can.

  In another embodiment according to the present invention to be described subsequently, the combination of the unit panel 5 and the unprocessed region 6 is different from that in the first embodiment. In the following description, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

(Example 2)
2 and 3 are schematic views showing the metal can 1 of the second embodiment.
In this embodiment, the unprocessed region 6 is connected to the peripheral surface of the unprocessed body portion 2 adjacent to the peripheral polyhedral wall 4 at at least one end in the can axis direction of the peripheral polyhedral wall 4. Shows the form.

In FIG. 2, the unprocessed area 6 is arranged in an area (inverted triangular shape) corresponding to the arrangement area of the six unit panels 5 at the upper end portion in the can axis direction of the circumferential polyhedral wall 4. When the metal can 1 is viewed from the front, the unit panel 5 appears to be partially recessed. Similarly to the first embodiment, the unprocessed region 6 is divided from the unit panel 5 by a boundary ridge line 51 of the unit panel 5 adjacent to the unprocessed region 6 in the circumferential direction.
Further, the raw region 6 may be connected to the peripheral surface of the raw body portion 2 adjacent to the circumferential polyhedral wall 4 at both ends in the can axis direction of the circumferential polyhedral wall 4, The unprocessed regions 6 at both ends may be connected to each other. That is, there may be a region in the trunk portion 2 where the unit panel 5 does not exist in the can axis direction. FIG. 3 shows this state. One circumferential polyhedral wall 4 is the uppermost circumferential polyhedral wall 4 from the upper end to the lower end in the can axis direction of the circumferential polyhedral wall 4. In FIG. 4, a single and a plurality of unprocessed areas 6 are alternately arranged in an area corresponding to the arrangement area of ten unit panels 5 for each row of the polyhedral wall 4.
Also in this form, the decorativeness can be improved as in the first embodiment.

Example 3
FIG. 4 is a schematic diagram illustrating the metal can 1 of the third embodiment.
In the present embodiment, a form in which information such as characters, symbols, and patterns is displayed on the circumferential polyhedral wall 4 by the arrangement of the unprocessed regions 6 is shown.
That is, as shown in FIG. 4, “α”, which is one of the Greek letters by using the arrangement of the unprocessed region 6 in the circumferential polyhedral wall 4 formed in a plurality of rows in the can axis direction on the body 2. The example which displayed the character or symbol which imitated is shown. That is, the unprocessed area 6 is arranged in an area corresponding to the arrangement area of a total of 15 unit panels 5 along the character or symbol of “α”. In addition, the unprocessed region 6 is divided by a convex boundary ridge line 51. In the present embodiment, four units of the unit panel 5 are diamond-shaped at a portion surrounded by the letters or symbols “α”. A partial polyhedral wall 9 configured in a shape is formed.
By adjusting the arrangement and the number of unprocessed regions in this way, various displays can be performed in the polyhedral wall, and the decorativeness can be improved.

(Example 4)
FIG. 5 is a schematic view showing the metal can 1 of the fourth embodiment.
The body of the metal can is printed to display various information. When a unit panel is formed on the body, the information displayed on the printing surface on the unit panel is a cylinder. Compared to information printed on the body of the shape, it may be difficult to see.

Therefore, in this embodiment, information such as characters, symbols, and patterns is displayed in the unprocessed area 6. FIG. 5 shows an example in which the alphabet character “a” “a” is displayed in the unprocessed area 6. In the present embodiment, as in the first embodiment, the printing surface is formed on the unprocessed area 6 formed in the circumferential polyhedral wall 4 and disposed in the area corresponding to the arrangement area of the four unit panels 5. They are positioned relative to each other so that the display units provided on the top are located.
With such a form, information can be printed and displayed on the surface of the unprocessed region 6 without unevenness, so that the printed surface can be easily seen and the decorativeness can be improved.

FIG. 6 is a schematic view showing the metal can 1 of the fourth embodiment.
A display part (for example, a barcode (identifier), etc.) may be printed on the metal can, but when the unit panel is formed on the body part, the display part on the unit panel is difficult to read. There is concern about becoming.
Therefore, also in the present embodiment, the display unit 7 is displayed in the unprocessed area 6 as shown in FIG. Specifically, at the lower end portion in the can axis direction of the circumferential polyhedral wall 4, the unprocessed area 6 is arranged in an area (triangular shape) corresponding to the arrangement area of the three unit panels 5, and within the area The display unit 7 is positioned.

  Here, since alignment of the display part 7 and the unprocessed area | region 6 is required, alignment of both is demonstrated below. The display unit 7 and the unprocessed region 6 may be positioned relative to each other so that the display unit 7 is positioned in the unprocessed region 6, but here, a molding machine 10 described later is used. The case where the polyhedral wall 4 is formed will be described.

Printing of information including the display unit 7 is performed in a state of a cylindrical surface before the polyhedral wall 4 is formed on the body 2 of the metal can 1. After the information is printed, the polyhedral wall 4 is formed in accordance with the print pattern by a molding machine 10 described later.
At this time, in order to align the printed pattern with the unprocessed area 6 of the polyhedral wall 4, as shown in FIG.
The alignment mark 8 is for indicating the position of the display unit 7 printed on the body 2. In the molding machine 10, the alignment mark 8 is read by a sensor, and the display unit 7 is displayed in the unprocessed region 6. The rotation of the body 2 is controlled so that the printing surface is positioned.

By such a form, the display part 7 can be printed in the position which is easy to read among the trunk | drum 2, and the unprocessed area | region 6 can be arrange | positioned according to the display part 7, and it can make the display part 7 easy to read. it can.
Further, in this embodiment, the case where the display unit 7 is displayed in the raw region 6 by performing alignment between the display unit 7 and the raw region 6 has been described. When displaying identification information such as a product name indicating a product in a metal can, the alignment information display unit 7 may be displayed on the unprocessed region 6 by performing alignment as described above.
Thereby, the display part 7 can be printed in the position which is easy to read among the trunk | drum 2 of the metal can 1, and the unprocessed area | region 6 can be arrange | positioned according to the display part 7, and the identification information of the display part 7 is read. It can be made easier.
Furthermore, alignment can be performed more accurately without the unprocessed region 6 and the display unit 7 being displaced during processing of the metal can 1.

(Example 5)
FIG. 7 is a schematic view showing the metal can 1 of the fifth embodiment.
The metal can 1 of the present embodiment partially forms a partial polyhedral wall 9 composed of a plurality of unit panels 5 divided by a convex boundary ridge line 51 in the circumferential direction of the body portion 2, and three-dimensional decoration is provided. It has been subjected. FIG. 7 shows an example in which a plurality of unit panels 5 are concentrated as a partial polyhedral wall 9 in a part of the body 2 in the circumferential direction and in a substantially middle region in the can axis direction. . Here, it can also be said that the polyhedral wall 4 is constituted by the partial polyhedral wall 9 and the unprocessed region 6.

By arranging the unit panel 5 as shown in FIG. 7 and making it three-dimensionally decorated, the decorativeness can be improved and the visibility can be improved.
The number of unit panels 5 and the arrangement position (design) may be set as appropriate within the range in which the strength is maintained due to the balance with the strength of the body 2.

(Example 6)
FIG. 8 is a schematic view showing the metal can 1 of the sixth embodiment.
In the present embodiment, a circumferential polyhedral wall 400 having a large number of unit panels 5 divided by convex boundary ridge lines 51 at least partially in the can axis direction of the body portion, and a portion in the circumferential direction of the body portion. The form provided with the partial polyhedron wall 9 in FIG. Here, an example in which the partial polyhedral wall 9 displays the alphabet character “w” is shown.

If the circumferential polyhedral wall 400 and the partial polyhedral wall 9 are partially provided in the circumferential direction of the body portion, the strength is maintained by the circumferential polyhedral wall 400 and the circumferential surface of the body portion is partially formed in the circumferential direction. The decoration effect can be enhanced by the partially polyhedral wall 9 provided for the purpose.
In particular, by providing the circumferential polyhedral wall 400 near the center in the can axis direction, the strength of the metal can when used in a negative pressure can can be maintained.

(Example 7)
FIG. 9 is a schematic view showing the metal can 1 of the seventh embodiment.
As shown to Fig.9 (a), in the present Example, the recessed part shape of the several unit panel of the metal can 1 consists of several types. That is, the metal can 1 of the present embodiment includes a rhomboid unit panel 5 having a valley line 52 shown in FIG. 1 and a rhomboid unit panel 5A having a concave shape different from that of the unit panel 5. Yes.
FIG. 9B shows a BB cross-sectional view of FIG. As shown in FIG. 9B, the valley line 52 of the unit panel 5 </ b> A is formed shallower in the inward direction of the body portion 2 than the unit panel 5.

FIGS. 9C to 9F are cross-sectional views showing modifications according to the present embodiment, and the unit panels 5B to 5D shown in FIGS. 9C to 9F are shown in FIG. This corresponds to the unit panel 5A in the -B cross section (FIG. 9B).
FIG. 9C shows the unit panel 5 </ b> B in which the valley line 52 is formed deeper inward of the body portion 2 than the unit panel 5.
Further, FIG. 9D shows a unit panel 5 </ b> C constituted by a curved surface that is not formed with the valley line 52 and is formed shallower inward of the body portion 2 than the unit panel 5. In FIG. 9E, a unit panel 5 </ b> D configured with a curved surface that is not formed with the valley line 52 and is formed deeper inward in the body 2 than the unit panel 5 is illustrated.
Further, the unit panels 5A to 5D can be used in appropriate combinations, and FIG. 9 (f) shows a form in which a circumferential polyhedral wall 4 is formed on the body 2 by the unit panels 5C and 5D. Yes.

  Here, the unit panel 5 and the unit panels 5A to 5D are not limited to the combination of the two types of unit panels, and the unit panels having different panel recess shapes, that is, three or more types having different recess shapes. These unit panels may be appropriately combined.

  In the first to sixth embodiments described above, the form in which the unprocessed region exists in a part of the circumferential polyhedral wall has been described. However, as in the present embodiment, the unit panel and the unit panel have different concave shapes. Combining unit panels and forming a concave polyhedron wall composed of a plurality of types can ensure a certain strength and change the decorative effect.

(Unit panel)
Here, although the metal can 1 was demonstrated as a two-piece can in above-mentioned Examples 1-7, it is not limited to this, The metal can of other structures, such as a three-piece can, may be sufficient. In addition, the unit panel 5 and the unit panels 5A to 5D having different concave shapes from the unit panel 5 have a rhombus shape (outer shape). However, the shape is not limited to this, and other shapes such as a hexagonal shape may be used. Applicable. Further, the size and number of unit panels formed in the circumferential direction can be arbitrarily set. In this embodiment, the number of unit panels formed in the circumferential direction is 11. However, the number of unit panels may be 12 or more, and by increasing the number of installed units, the size of each unit panel is reduced and the unit panel is increased. The size of the unprocessed area corresponding to this size is also reduced, so that a finer decoration effect can be provided.
In the present embodiment, the valley line 52 in the unit panel 5 has a shape that allows the unit panel 5 to be recessed in a direction orthogonal to the can axis direction (horizontal direction). The unit panel 5 may also be recessed in the axial direction, and in some cases, the unit panel 5 may have a valley line along the can axis direction.

(Polyhedral wall molding method)
Next, a method for forming the polyhedral wall 4 of the can 1 according to the present embodiment will be described with reference to FIGS.
FIG. 11 shows a molding machine 10 for molding the polyhedral wall 4, and is a schematic perspective view showing a state in which a part of the body portion 2 of the metal can 1 attached to the inner mold 11 is cut out and the inner mold 11 is exposed. It is. The polyhedral wall 4 is molded by the molding machine 10 having the inner mold 11 and the outer mold 12, and is applied to the body portion 2 before the can lid 3 is tightened.

The inner mold 11 is provided with a ridge line protrusion 11a for forming a boundary ridge line 51 constituting the unit panel 5 on its outer surface, and the outer mold 12 is a recess for constituting the unit panel 5 on its outer surface. A projecting ridge 12a is provided. Further, in the outer mold 12 of the present embodiment, the ridge line for forming the valley line for forming the valley line 52 is a diagonal line in the horizontal direction of the concave protrusion 12a (the direction perpendicular to the height direction of the outer mold 12). Formed on top.
Further, the inner mold 11 is provided with a recess 11b that faces the recess protrusion 12a of the outer mold 12, and the outer mold 12 has a recess 12b that faces the ridge 11a of the inner mold 11. Is provided. Then, as shown in FIGS. 11 and 12, a flat portion 12 c that does not have the concave protrusion 12 a is provided in the middle portion of the outer die 12 in order to provide the unprocessed region 6 on the outer surface of the outer die 12. Is provided. In the present embodiment, the flat portion 12c is provided so as to form the unprocessed region 6 for one unit panel. However, the number and arrangement of the flat portions 12c so as to form a desired unprocessed region 6 are provided. Can be changed.

FIG. 12 is a schematic cross-sectional view in the can axis direction for explaining a state in which the inner mold 11 and the outer mold 12 are embossed in order to form the polyhedral wall 4, and (a) is a series of unit panels. The formation location, (b), shows the remaining location of the unprocessed area.
Here, in FIG. 12, (a) and (b), the flat part 12c is provided in the middle part of the outer mold | type 12, and the pattern of the protrusion 12a for recessed parts differs. The inner mold 11 is a similar mold.

First, the body part 2 was sandwiched between the inner mold 11 and the outer mold 12 so that the inner peripheral surface of the body part 2 was in contact with the inner mold 11 and the outer peripheral surface of the body part 2 was in contact with the outer mold 12. In this state, the metal can 1 before the can lid 3 is wound is set in the molding machine 10. Then, by rotating the inner mold 11 and the outer mold 12 with the body portion 2 sandwiched therebetween, the body portion 2 rotates in the circumferential direction, and the inner mold 11 and the outer mold 12 perform stamping (bending). Done. At that time, the ridge line ridge 11a of the inner mold 11 and the recess ridge 12a of the outer mold 12 sandwich the inner and outer peripheral surfaces of the body part 2, whereby the boundary ridge line 51 and the valley line 52 are formed. The polyhedral wall 4 having the unit panel 5 on the peripheral surface is processed. In other words, the boundary ridge lines 51 of the plurality of unit panels 5 are mountain-folded outwardly from the body portion 2 with respect to the body portion 2 by the ridge line ridges 11a of the inner mold 11, and the ridge lines are formed by the recessed protrusion ridges 12a of the outer mold 12. The unit panel 5 is formed by indenting the region surrounded by the protrusions 11a toward the inside of the body.
At this time, as shown in FIG. 12 (b), in the portion where the flat portion 12c is provided, the inner die 11 and the outer die 12 are not pressed (bent), so that FIG. The recessed unit panel surface 5 is not formed as in (), and an unprocessed region 6 that is an unprocessed body peripheral surface remains.
By forming the unit panel 5 and the unprocessed region 6 in this way, the polyhedral wall 4 of this embodiment is formed.

Here, the molding method of the polyhedral wall 4 is not limited to the method using the molding machine 10 described above, and the outer mold and the inner mold may not be a rotating body. However, by applying the inner mold 11 and the outer mold 12 as described above, when the metal can 100 of the comparative example is processed, the same inner mold 11 can be used as described above. In this example, the portion corresponding to the unprocessed region 6 of the outer mold 12 is the flat portion 12c. However, the flat portion 12c is formed when the body portion 2 is sandwiched between the inner mold 11 and the outer mold 12. Any shape that does not interfere with the body 2 may be used, and the body 2 may be touched if the shape of the circumferential surface of the body remains.
Here, in the above-described seventh embodiment, the protrusion ridge 12a having no valley line forming ridge line for forming the valley line 52, or the protrusion ridge 12a having a small protrusion amount compared to the above. By using the unit panel surface 5 is formed.

DESCRIPTION OF SYMBOLS 1 Metal can 2 Body part 3 Can lid 4 Polyhedron wall 5 Unit panel 5A thru | or 5D Unit panel 50 Panel row | line | column 51 Boundary edge line 52 Valley line 53 Upper triangular part 54 Lower triangular part 55 Intersection 6 Unprocessed area 7 Display part 8 Alignment Mark 9 Partial polyhedral wall 10 Molding machine 11 Inner mold 11a Ridge ridge 11b Depressed part 12 Outer mold 12a Recessed ridge 12b Depressed part 12c Flat part

Claims (11)

The body portion has a circumferential polyhedral wall at least in a can axis direction, the polyhedral wall is divided by a convex boundary ridge line, and a region surrounded by the boundary ridge line is recessed toward the inside of the body portion. A metal can composed of a number of unit panels,
A part of the circumferential polyhedral wall is a raw region where the raw body peripheral surface remains ,
A metal can having a polyhedral wall , wherein information on characters, symbols, or patterns is displayed on the circumferential polyhedral wall by the unprocessed region .   2. The metal can having a polyhedral wall according to claim 1, wherein the unprocessed region is disposed in a region corresponding to an arrangement region of at least one unit panel in the polyhedral wall.   3. The metal can having a polyhedral wall according to claim 1, wherein the unprocessed area is separated from the unit panel by a boundary ridge line of the unit panel adjacent to the unprocessed area in the circumferential direction. .   4. The metal can having a polyhedral wall according to claim 1, wherein the unprocessed region is provided in a midway portion of the circumferential polyhedral wall in the can axis direction. 5.   The unprocessed region is connected to an unprocessed body peripheral surface adjacent to the peripheral polyhedral wall at at least one end in the can axis direction of the peripheral polyhedral wall. A metal can having a polyhedral wall according to any one of items 1 to 3. The polyhedral wall according to any one of claims 1 to 5 , wherein the polyhedral wall is positioned relative to each other so that a display unit provided on a printing surface is positioned in the unprocessed region. Metal can with. The metal can having a polyhedral wall according to claim 6 , wherein the display unit is a bar code.   A polygonal pattern is displayed on the circumferential polyhedral wall by the raw area.
A metal can having a polyhedral wall according to any one of claims 1 to 7.   The polygonal pattern is a diamond-shaped or triangular pattern
A metal can having a polyhedral wall according to claim 8. Forming a partial polyhedral wall composed of a plurality of unit panels in the circumferential direction of the trunk,
The periphery of the partial polyhedral wall is an unprocessed region where an unprocessed body peripheral surface remains,
A metal can having a polyhedral wall, characterized in that information on characters, symbols, or patterns is displayed by the partial polyhedral wall. A circumferential polyhedral wall having a large number of unit panels divided by convex boundary ridge lines at least in a portion of the barrel in the can axis direction, and the partial polyhedral wall partially in the circumferential direction of the trunk. The metal can having a polyhedral wall according to claim 10 , wherein the metal can has a polyhedral wall.

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