JP2020040711A - Bottle can and method for manufacturing same - Google Patents

Abstract

To provide: a method for manufacturing a bottle can having excellent designability which is capable of reducing manufacturing steps; and the bottle can.SOLUTION: A bottle can includes a cylindrical-shaped tubular body part, a lower inclined part whose diameter decreases as going from an upper end portion of the tubular body part toward upward in an axial direction of the can, a cylindrical part extending linearly along the axis of the can from an upper end of the lower inclined part toward upward in the axial direction of the can, an upper inclined part whose diameter decreases from an upper end of the cylindrical part toward upward in the axial direction of the can at an angle smaller than an angle of the lower inclined part relative to the axis of the can, and a mouth part disposed on an upper side in the axial direction of the can in the upper inclined part. A plurality of ribs extending from a lower side in the axial direction of the can toward upward in the axial direction of the can are formed over the entire circumference of the upper inclined part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bottle can in which a metal cap is attached to an opening and filled with contents such as a beverage, and a method for producing the same.

  2. Description of the Related Art As a container to be filled with contents such as beverages, there is known a container in which a metal cap is attached to an opening of a bottle-shaped can (bottle can) and sealed. A bottle can is generally formed in a bottomed cylindrical shape having a body and a bottom, and a shoulder portion and a diameter-reducing portion are provided on the opening side of the body, the diameter gradually decreasing upward, and the diameter-reducing portion is provided. Is provided with a mouth at the upper end. Such a bottle can is formed by subjecting a metal plate (a plate of an aluminum alloy material) to a cupping process (drawing process) and a DI process (drawing and ironing process, Drawing & Ironing) to form a bottomed cylindrical shape having a body and a bottom. The shoulder portion and the reduced diameter portion are formed by subjecting the body of the cylindrical can having a bottom to a diameter reduction process.

  As such a bottle can, for example, a bottle can described in Patent Document 1 and a bottle can described in Patent Document 2 are known. Among these, the bottle can described in Patent Literature 1 includes a bottom portion, a body portion, a shoulder portion, a neck portion (reduced diameter portion), and a mouth portion, and the inclination angle β of the reduced diameter portion is 50 ° to 89 °. (1 ° to 40 ° when the can axis direction is 0 °). Further, the bottle can described in Patent Literature 2 has the same configuration as the bottle can described in Patent Literature 1, and the shoulder portion is approximately 45 ° from the body (when the can axis direction is 0 °, the shoulder is 45 °). °), and the inclination angle of the reduced diameter portion is set to approximately 6 °. The bottle cans described in Patent Literatures 1 and 2 are formed into a tapered smooth shape while successively deforming the body of the can by die necking using a plurality of molding dies.

Japanese Patent No. 5323775 JP-T-2017-526591

  However, in the bottle can having the above shape, in order to obtain a smooth shape from the shoulder portion to the neck portion, it is necessary to reduce the amount of one processing and perform the diameter reducing process many times. When the number of times of processing increases, many molding dies must be arranged side by side on a production line, and a large installation space is required. This leads to an increase in manufacturing costs.

  The present invention has been made in view of such circumstances, and provides a bottle can manufacturing method and a bottle can that can shorten the manufacturing process and can manufacture a bottle can with excellent design. With the goal.

  The bottle can of the present invention has a cylindrical tubular body, a lower inclined portion whose diameter is reduced from the upper end of the tubular body toward the upper side in the axial direction of the can, and a can shaft from the upper end of the lower inclined portion. A cylindrical portion that extends linearly upward along the can axis direction along the upper portion, and an upper inclined portion that decreases in diameter as going upward in the can axis direction at an angle smaller than the angle of the lower inclined portion with respect to the can axis from the upper end of the cylindrical portion. A plurality of ribs extending from the lower side in the can axis direction to the upper side in the can axis direction are formed in the upper inclined section over the entire circumference. ing.

  In the present invention, since the plurality of ribs extending from the lower side in the axial direction of the can to the upper side in the axial direction of the can are formed in the upper inclined portion, the design of the bottle can can be improved. Further, since the cylindrical portion is provided below the upper inclined portion on which the plurality of ribs are formed in the axial direction of the can, the bottle can can be seen like a neck. Further, since a plurality of ribs are formed on the upper inclined portion, when the bottle can is gripped, the fingers come into contact with the unevenness, so that there is a feeling of grip and it is slippery and easy to grip. In addition, since a plurality of ribs are formed on the upper inclined portion, when pouring the internal liquid into a glass or the like from a bottle can, the internal liquid is stirred by the inner surfaces of the plurality of ribs. , Foaming properties can be improved.

  Here, in the manufacturing process, in order to form the upper inclined portion, after forming the lower inclined portion, a small cylindrical portion extending linearly upward in the can axis direction along the can axis from the upper end of the lower inclined portion. After molding, a plurality of diameter reducing dies are pressed against the upper side of the small cylindrical portion and relatively moved to form an upper inclined portion. At this time, if the number of times of diameter reduction using the diameter reducing mold is small, a step-like mark (horizontal streak) remains in the circumferential direction of the bottle can, so that a plurality of diameter reducing molds are further pressed and relatively moved. It is necessary to carry out a reforming step or to use a large number of dies for reducing the diameter so as not to leave the step-like trace. On the other hand, in the present invention, after the diameter reducing mold is pressed to the upper side of the small cylindrical portion and relatively moved to incline a part of the small cylindrical portion, the rib forming die is pressed and relatively moved. Thus, since the plurality of ribs are formed, even if the above-mentioned step-like mark remains in the circumferential direction of the bottle can, the above-mentioned step-like mark can be made inconspicuous by the plurality of ribs. Therefore, the manufacturing process of the bottle can can be shortened as compared with a case where many small-diameter dies are pressed and finely formed or a reforming process is performed.

  The method for manufacturing a bottle can according to the present invention is the method for manufacturing a bottle can described above, wherein a cylindrical body forming step of forming a cylindrical cylindrical body, and the diameter of the cylindrical body is reduced toward the upper side in the axial direction of the can. A reduced-diameter portion forming step of forming a reduced-diameter portion including the lower inclined portion, the cylindrical portion, and the upper inclined portion, wherein the reduced-diameter portion forming process includes a plurality of cylindrical surfaces each having a different molding surface diameter. By pressing the mold for diameter reduction relative to the can axis direction by pressing against the lower inclined portion, a small linearly extending linearly upward along the can axis along the can axis from the upper end of the lower inclined portion. A cylindrical portion, a lower inclined portion forming step of molding, and an upper can axial direction region of the small cylindrical portion formed by the lower inclined portion forming step is inclined. After that, a rib-forming mold for forming the plurality of ribs is pressed against the outer surface thereof. By relatively moving, and a upper inclined portion forming step of forming the upper inclined portion having a plurality of ribs.

  In the present invention, after forming the small cylindrical portion, when forming the upper inclined portion in the can axial direction upper region leaving the can axial direction lower region of the small cylindrical portion, the same as the lower inclined portion Since a plurality of ribs can be formed by processing, a manufacturing die can be shortened, and a bottle can excellent in design can be manufactured.

  ADVANTAGE OF THE INVENTION According to this invention, while shortening a manufacturing process, it can manufacture a bottle can excellent in design.

It is a front view of the bottle can manufactured by the manufacturing method of the bottle can according to the first embodiment of the present invention. It is a schematic diagram which shows the process of forming a cup and forming a cylindrical body in order in the manufacturing method of the bottle can of the said 1st Embodiment in order, and is a front view which made the longitudinal section which passes a can axis | shaft about the right half. is there. It is a front view which shows the intermediate molded object after the lower inclined part formation process in the said 1st Embodiment. FIG. 4 is a front view showing the intermediate molded body during the upper inclined portion forming step in the first embodiment. FIG. 4 is a cross-sectional view showing a rib-forming mold for forming a plurality of ribs on an inclined portion in the first embodiment. FIG. 4 is a front view showing the intermediate molded body after the upper inclined portion forming step in the first embodiment. It is a front view showing a bottle can according to a second embodiment of the present invention.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a front view of a bottle can 1 manufactured by the method for manufacturing a bottle can according to the first embodiment of the present invention. The bottle can 1 is used as a container for accommodating a beverage or the like by attaching a cap (not shown) to an open end. 2 to 6 are explanatory views showing each step of the method for manufacturing a bottle can of the present embodiment. Among these, FIG. 2 is a schematic diagram sequentially showing the steps from forming the cup to forming the cylindrical body 41, and FIGS. 4 to 6 are diagrams illustrating the reduced diameter portion forming step.

  The bottle can 1 is made of a thin sheet metal such as aluminum or aluminum alloy, and has a bottomed cylindrical shape having a cylindrical body (wall) 10 and a dome-shaped bottom (bottom) 20 as shown in FIG. Is formed. As shown in FIG. 1, the body portion 10 and the bottom portion 20 are arranged coaxially with each other, and in the present embodiment, the common shaft will be described as a can shaft O.

  In the direction along the can axis O (the can axis O direction), a direction from the opening end 10a of the body 10 toward the bottom 20 is defined as a downward direction, and a direction from the bottom 20 toward the opening end 10a is defined as an upward direction. In the following description, the vertical direction is determined in the same manner as the directions shown in FIGS. Also, a direction perpendicular to the can axis O is called a radial direction, and of the radial directions, a direction approaching the can axis O is radially inward (inward), and a direction away from the can axis O is radially outward ( Outside). Further, the direction of orbit around the can axis O is defined as a circumferential direction.

  As shown in FIG. 1, the body 10 includes a cylindrical body 11 formed in a cylindrical shape on the bottom 20 side, and an upper side in the can axis O direction (opening end 10a side) from the upper end of the cylindrical body 11. A lower inclined portion 12 whose diameter decreases as it goes toward the front end; a cylindrical portion 13 extending linearly upward from the upper end of the lower inclined portion 12 along the can axis O in the can axis O direction; And an upper inclined portion 14 whose diameter decreases toward the upper side in the can axis O at an angle smaller than the angle of the lower inclined portion 12 with respect to the can axis O, and is provided above the upper inclined portion 14 in the can axis O direction. A mouth 16. The reduced diameter portion of the present invention is constituted by the lower inclined portion 12, the cylindrical portion 13, and the upper inclined portion 14.

  As shown in FIG. 1, the inclination angle θ1 of the lower inclined portion 12 with respect to the can axis O is set to 20 ° or more and 60 ° or less, and the inclined angle θ2 of the upper inclined portion 14 with respect to the can axis O is 1 °. At least 20 ° is set. That is, the inclination angle θ1 of the lower inclined part 12 is set to be larger than the inclination angle θ2 of the upper inclined part 14, and the upper inclined part 14 stands more in the direction of the can axis O than the lower inclined part 12. It is formed in a shape. The cylindrical body 11, the lower inclined portion 12, the cylindrical portion 13, and the upper inclined portion 14 each have an annular shape extending over the entire circumference of the body 10 in the circumferential direction.

  Further, the cylindrical body 11, the lower inclined portion 12, the cylindrical portion 13, and the upper inclined portion 14 are smoothly connected to each other, and are connected smoothly without forming a step between each other. I have. Specifically, a first connecting portion 12a formed by a convex curved surface that is convex radially outward and upward is provided between the cylindrical body portion 11 and the lower inclined portion 12. The lower end of the cylindrical body 11 and the lower inclined portion 12 are connected by the connecting portion 12a. In addition, a second connecting portion 13a is provided between the lower inclined portion 12 and the cylindrical portion 13, and the second connecting portion 13a is formed of a concave curved surface that is concave toward the outside in the radial direction and toward the lower side. The upper end portion of the lower inclined portion 12 and the lower end portion of the cylindrical portion 13 are connected to each other.

  In addition, the mouth portion 16 disposed on the upper portion of the body portion 10 has a large-diameter portion 161 which is once enlarged at the upper end of a concave portion located above the upper inclined portion 14 in the direction of the can axis O, and an upper end of the large-diameter portion 161. And a curl portion 163 formed at the open end 10a at the upper end of the screw portion 162. As described above, the mouth 16 is opened to the outside by the opening end 10a, and contents such as beverages are filled into the bottle can 1 through the mouth 16. By attaching a cap (not shown) to the mouth 16, the contents filled in the inside of the bottle can 1 are sealed.

  Among these, the upper inclined portion 14 is provided with a plurality of ribs 15 that extend linearly along the can axis O direction from the lower side in the can axis O direction to the upper side in the can axis O direction. A groove 152 is formed between the ribs 15. Each of the plurality of ribs 15 is a portion projecting radially outward. For example, the number of the plurality of ribs 15 is 8 or more and 30 or less, preferably 12 or more and 24 It may be formed in a range of not more than the number. For example, in the example shown in FIG. 1, 16 are formed. If the number of the ribs 15 is small, wrinkles are likely to occur during molding, and if it is too large, processing becomes difficult. The rib 15 is formed so as to have a V-shape in a cross section orthogonal to the can axis O, and the bottom thereof is formed such that the interval between the ribs gradually decreases from the lower side to the upper side in the can axis O direction. It is formed.

  More specifically, in the plurality of ribs 15, the width L5 on the lower side in the can axis O direction is 2 mm to 16 mm, and the width L6 on the upper side in the can axis O is 2 mm to 12 mm, and the height (depth of the groove 152). Is set to 0.3 mm or more and 6 mm or less, preferably 0.5 mm or more and 4 mm or less. Since the plurality of ribs 15 are formed by pressing and moving the rib-forming mold a plurality of times, each rib 15 is positioned above the upper end of the cylindrical portion 13 and the upper side of the upper inclined portion 14 in the can axis O direction. The groove 152 is not radially outwardly protruded from the tapered surface connecting the lower end of the recessed portion, but the groove 151 is concaved inwardly in the radial direction, so that the portion 151 located on the radially outermost side of each rib 15 has a diameter. This is an illusion that it protrudes outward in the direction. Since such a plurality of ribs 15 are formed, when the bottle can 1 is gripped, the fingers come into contact with unevenness, so that there is a feeling of grip, it becomes slippery, and it is easy to grip. The design can be improved.

  The height L0 (the height of the bottle can 1) from the bottom surface of the bottom portion 20 of the bottle can 1 thus formed to the upper surface of the curled portion 163 is set to 110 mm to 240 mm. Further, the length L1 from the lower end of the lower inclined portion 12 in the direction of the can axis O to the upper end of the upper inclined portion 14 in the direction of the can axis O is set to 35 mm to 100 mm, more preferably 40 mm to 100 mm. It may be set to 70 mm. The distance from the lower end of the lower inclined portion 12 in the can axis O direction to the upper end of the can axis O direction, that is, the length L2 of the lower inclined portion 12 in the direction along the can axis O is: It may be set to 10 mm to 30 mm, and more preferably, to 15 mm to 25 mm. Further, the length L3 of the cylindrical portion 13 is set to 1 mm to 80 mm, and more preferably, 5 mm to 20 mm. In addition, a distance L4 along the can axis O direction of the upper inclined part 14 from the lower end of the can inclined direction in the can axis O direction, that is, a distance L4 along the can axis O direction of the upper inclined part 14 is set to 10 mm to 80 mm. Preferably, it is set to 15 mm to 50 mm. In the present embodiment, the neck length effect of the bottle can 1 is obtained by setting the distance between the upper inclined portion 14 having the cylindrical portion 13 and the plurality of ribs 15 to the above range.

  As an example of other dimensions of the bottle can 1 configured as described above, in a vertical cross-sectional view passing through the can axis O of the bottle can 1, the outer diameter of the cylinder body 11 as a product is 140 mm to 220 mm, The outer diameter of the upper end of the inclined portion 14 (the outer diameter of the contact point between the upper inclined portion 14 and the mouth portion 16) is, for example, in the range of 60 mm to 120 mm. However, the above dimensions are not limited to the above numerical ranges.

  The bottle can 1 including the lower inclined portion 12, the cylindrical portion 13, and the upper inclined portion 14 having the plurality of ribs 15 is manufactured by a manufacturing method described below. The method for manufacturing the bottle can 1 includes a tubular body forming step, a reduced diameter part forming step, and a mouth part forming step.

[Tube forming step]
First, a relatively large diameter and shallow cup 40 is formed as shown in FIG. 2A by punching and drawing an aluminum plate material such as an aluminum alloy, and then drawing and ironing the cup 40 again. By adding (DI processing), as shown in FIG. 2 (b), a bottomed cylindrical body 41 having a predetermined height is formed, and its upper end is trimmed and trimmed. By this DI processing, the bottom of the cylindrical body 41 is formed into the shape of the bottom 20 as the final bottle can 1. The original thickness before press forming is 0.250 mm to 0.500 mm, and the thickness (wall thickness) t1 on the bottom 20 side of the cylindrical body 41 shown in FIG. The thickness (flange thickness) t2 at the opening end is 0.200 mm to 0.400 mm.

[Reduced diameter forming step]
The reduced diameter portion forming step includes a lower inclined portion forming step of forming a small cylindrical portion 140 extending linearly along the can axis O on the upper side of the lower inclined portion 12 and the can axis O; Forming an upper inclined portion 14 having a plurality of ribs 15.

[Lower inclined portion forming step]
In the lower inclined portion forming step, the cylindrical body 41 formed up to the state shown in FIG. 2B is provided with a plurality of shrinkage parts having annular forming surfaces having different processing diameters indicated by two-dot chain lines in FIG. By pressing the diameter mold 70 (die-necking mold) in the order of the processing diameter and moving it relatively in the direction of the can axis O, the angle with respect to the can axis O is not less than 20 ° and not more than 60 °. The lower inclined portion 12 having a straight vertical cross section is formed, and the small cylindrical portion 140 linearly extending upward from the upper end of the lower inclined portion 12 along the can axis O in the can axis O direction. In addition, the shape shown in FIG. 3 is the intermediate molded body 42 in which the lower inclined portion 12 and the small cylindrical portion 140 are formed.

[Step of forming upper inclined portion]
In the upper inclined portion forming step, the upper region of the small cylindrical portion 140 in the direction of the can axis O except for the region of the lower side in the direction of the can axis O is formed into a tapered surface shape whose diameter gradually decreases toward the upper side in the direction of the can axis O. The forming section forming step and the temporary forming section formed in the temporary forming section forming step are reformed as necessary to leave an area above the can axis O in the can axis O direction below the area of the small cylindrical section 140 below the can axis O. A reforming step of smoothly inclining, and a rib forming step of forming a plurality of ribs by pressing a rib forming mold to form a plurality of ribs for forming a plurality of ribs on the outer surface thereof and relatively moving the ribs. Prepare.

(Temporary molded part forming step)
In the temporary forming portion forming step, a plurality of (for example, four) diameter reducing dies having annular forming surfaces having different working diameters are formed on the intermediate formed body 42 having the shape shown in FIG. By pressing from the large side and relatively moving in the direction of the can axis O, a temporary formed portion whose diameter decreases as the vertical cross section passing through the can axis O goes upward. In this step, the provisionally formed portion may be reduced in diameter stepwise toward the upper side in the direction of the can axis O. In the temporary forming portion forming step, an opening cylindrical portion 16 a that extends linearly upward from the upper end of the temporary forming portion along the can axis O and has a smaller diameter than the small cylindrical portion 140 is also formed.

(Reform process)
In the reforming process, a plurality of (for example, three) diameter reducing dies having annular forming surfaces having different processing diameters are pressed against the outer surface of the temporary forming portion and relatively moved, so that the temporary forming portion is smoothly reformed. Then, the angle with respect to the can axis O is 1 ° or more and less than 20 °, and the vertical section passing through the can axis O forms a linearly inclined portion 14a.

(Rib forming process)
After the reforming step, a plurality of ribs 15 are formed on the outer surface of the inclined portion 14a of the intermediate molded body 42 in the state shown in FIG. 4 by using the rib molding die 60 shown in FIG. The rib forming die 60 is formed in a cylindrical shape as a whole, and the distal end portion of the inner peripheral portion is formed in a tapered shape that gradually increases in diameter toward the distal direction, so that the axial distal end is formed. A tapered shaped portion 61 is formed at the portion, and a cylindrical guide portion 62 is formed at the base end. A plurality of ridges extending along the inclined direction are formed at regular intervals in the circumferential direction on the tapered molded portion 61. Then, as shown in FIG. 5, with the axis C2 of the rib forming die 60 and the can axis O of the intermediate formed body 42 aligned with each other, the tapered forming portion 61 of the rib forming die 60 is The inclined body 14 is pressed in the direction of the can axis O such that the portion from the lower end to the upper end of the inclined portion 14a is formed by disposing the molded body 42 to face the open end and approaching the can in the direction of the can axis O. As a result, a plurality of ribs 15 are formed over the entire circumference of the inclined portion 14a, and become the upper inclined portion 14.

[Mouth forming step]
Then, as shown in FIG. 1, a large-diameter portion 161 having a diameter larger than the upper end of the upper inclined portion 14 is formed on the mouth cylindrical portion 16a of the intermediate molded body 42 in the state shown in FIG. After the large diameter portion 161 is formed, a screw portion 162 to which a screw portion (not shown) of the cap is screwed is formed. Finally, curling is performed on the upper end of the cylindrical portion 16a for the mouth to form the curled portion 163, and the bottle can 1 having the mouth 16 is manufactured.

  In addition, the inside of the bottle can 1 manufactured in this manner is filled with contents such as beverages, and a cap (not shown) is wound around the mouth portion 16 to manufacture a sealed container. .

  In the bottle can 1 according to the present embodiment described above, since the plurality of ribs 15 extending upward from the lower side in the can axis O direction to the upper side in the can axis O direction are formed in the upper inclined portion 14, the design of the bottle can 1 is improved. Performance can be improved. Further, since the cylindrical portion 13 is provided below the upper inclined portion 14 on which the plurality of ribs 15 are formed in the direction of the can axis O, the bottle can 1 can be seen as a long neck. Further, since the plurality of ribs 15 are formed on the upper inclined portion 14, when the bottle can 1 is gripped, the fingers come into contact with the irregularities. In addition, since the plurality of ribs 15 are formed on the upper inclined portion 14, when the internal liquid is poured into the glass or the like from the bottle can 1, the internal liquid is stirred by the inner surfaces of the plurality of ribs 15. And foamability can be improved.

  Also, by pressing a small-diameter mold against the upper side of the small cylindrical portion 140 and relatively moving the small-diameter portion 140 to incline, and then pressing the rib-forming mold 60 to relatively move the small cylindrical portion 140, Since the plurality of ribs 15 are formed, even if a stair-like mark generated by the temporary forming portion forming step remains in the circumferential direction of the bottle can 1, the plurality of ribs 15 can make the stair-like mark inconspicuous. it can. Therefore, the manufacturing process of the bottle can 1 can be shortened as compared with a case where many small diameter dies are pressed and finely formed or a case where a reforming process is performed.

  Further, in the method for manufacturing the bottle can 1 of the present embodiment, after the small cylindrical portion 140 is formed, the upper inclined portion 14 on the upper side in the can axis O direction leaving a region below the small cylindrical portion 140 in the can axis O direction. When forming a plurality of ribs 15, it is possible to form a plurality of ribs 15 by the same processing as the lower inclined portion 12, that is, the same processing method as the conventional die-necking forming a reduced diameter portion in a bottle can. It is possible to manufacture the bottle can 1 which can be shortened and has excellent design properties.

[Second embodiment]
Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a front view showing a bottle can 1A according to the second embodiment. In the bottle can 1A, a plurality of ribs 15A of the upper inclined portion 14A are different from the plurality of ribs 15 of the first embodiment. Specifically, while each of the plurality of ribs 15 of the first embodiment linearly extends along the can axis O direction from the lower side in the can axis O direction to the upper side, the plurality of ribs 15A As shown in FIG. 7, each of the upper ends of the upper inclined portions 14A (located on the upper side in the can axis O direction) in a vertical section passing through the can axis O of the upper inclined portion 14A from the lower side to the upper side in the can axis O direction. And a line connecting the lower end (the upper end of the cylindrical portion 13) and the lower end (the upper end of the cylindrical portion 13) of the conical surface outlined in the upper inclined portion 14A. .

  Each of the ribs 15A has a groove 152A between the ribs 15A, similarly to the rib 15 described above. The plurality of ribs 15A may be formed in a range of 8 or more and 30 or less, preferably 12 or more and 24 or less over the entire circumference of the upper inclined portion 14A. For example, in the example shown in FIG. Individually formed. The plurality of ribs 15A of the present embodiment are formed by pressing a rib forming die against the inclined portion 14a in the same manner as the plurality of ribs 15 of the above-described first embodiment. Thus, the inclination angle of the inclined portion 14a with respect to the can axis O is preferably 10 ° or more and 50 ° or less.

  In the present embodiment, the plurality of ribs 15A extend obliquely from the lower side in the direction of the can axis O to the upper side with respect to the can axis O, so that the aesthetic appearance of the bottle can 1A can be further enhanced and the bottle can 1A can be further improved. The grip feeling of 1A can be further improved.

  The present invention is not limited to the configuration of each of the above embodiments, and various changes can be made in the detailed configuration without departing from the spirit of the present invention. For example, as a bottle can, a cylindrical body 41 with a bottom is formed in advance, and the opening end thereof is formed. However, the cylindrical body includes one having no bottom, and after forming the reduced diameter portion, Alternatively, a separately formed bottom may be wound around the body of the cylindrical body.

  In each of the above embodiments, the upper inclined portion forming step includes the temporary forming portion forming step, the reforming step, and the rib forming step, but is not limited thereto. For example, in the upper inclined part forming step, the rib forming step may be performed without performing the reforming step after the temporary forming part forming step. In the upper inclined portion forming step, the plurality of diameter reducing dies are pressed to finely form the above-described portion of the small cylindrical portion to form a smooth inclined portion 14a, and then the rib is formed without performing the temporary forming portion forming step. A molding step may be performed.

1 1A Bottle can 10 Body 10a Open end 11 Tube body 12 Lower inclined part 12a First connecting part 13 Cylindrical part 13a Second connecting part 14 14A Upper inclined part 14a Inclined part 15 15A Rib 151 Site 152 Groove 16 mouth Portion 16a Cylindrical portion 20 for mouth Bottom portion 40 Cup 41 Cylindrical body 42 Intermediate molded body (cylindrical body)
60 Mold for forming rib 70 Mold for reducing diameter 140 Small cylindrical part 161 Large diameter part 162 Screw part 163 Curl part

Claims (2)

A cylindrical tubular body, a lower inclined portion whose diameter is reduced from the upper end of the tubular body toward the upper side in the can axis direction, and a can axial direction upward along the can axis from the upper end of the lower inclined portion. A cylindrical portion extending linearly, an upper inclined portion whose diameter decreases from an upper end of the cylindrical portion toward an upper side in the can axial direction at an angle smaller than an angle with respect to the can axis of the lower inclined portion, and a can of the upper inclined portion A mouth provided on the upper side in the axial direction,
A plurality of ribs extending from the lower side in the axial direction of the can to the upper side in the axial direction of the can are formed over the entire circumference of the upper inclined portion. It is a manufacturing method of the bottle can of Claim 1,
A tubular body forming step of forming a cylindrical tubular body, and reducing the diameter of the tubular body toward the upper side in the can axis direction, thereby reducing the diameter of the lower inclined portion, the cylindrical portion, and the upper inclined portion. A step of forming a reduced diameter portion for forming
The reduced diameter portion forming step includes: pressing the plurality of reduced diameter dies having different molding surface diameters onto the cylindrical body to relatively move in the can axis direction, thereby forming the lower inclined portion and the lower inclined portion. A small cylindrical portion extending linearly upward in the can axis direction along the can axis from the upper end of the lower inclined portion forming step,
After inclining an upper region of the small cylindrical portion formed in the lower inclined portion forming step in the can axial direction, leaving a region on the lower side of the can axial direction, forming the plurality of ribs on the outer surface thereof. Forming an upper inclined portion having the plurality of ribs by pressing and moving a rib forming die relative to the mold. A method for manufacturing a bottle can.

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