JP4608206B2 - Variant can manufacturing method and expandable mold - Google Patents

Description

The present invention relates to a modified can manufacturing method and an expandable mold, and more particularly to an improvement in the decorative effect of a can and a reduction in the occurrence of deformation distortion of the can during molding.

For example, in beverage cans, three-piece cans and two-piece cans such as deep-drawn cans and squeezed iron cans are generally manufactured.
Since these cans have almost the same shape, they can be produced in large quantities and at low cost. However, since these cans have poor individuality in shape, it is difficult to differentiate the products themselves by shape. For this reason, for the purpose of individualizing and differentiating products, it is desired to develop cans that have unique shapes and are inexpensive.
In order to meet such a demand, for example, deformed cans having a can body widened portion (expanded portion) larger in diameter than the upper portion of the can body and the lower portion of the can body have been proposed (for example, Patent Documents 1, 2, and 3). See). These deformed cans have an expanded segment (expanded part) in the can body by disposing an expanding segment (split mold) in a cylindrical can body and expanding the can body with this mold. Is formed.

JP 49-28492 A JP 59-163041 A JP-A-10-128476

However, even in the deformed can, the pattern formed on the can body has the same shape in the circumferential direction and is shaped, and further variations are required.
When the present inventors examined improvement of the decoration effect of the can, forming an irregular concavo-convex pattern (a concavo-convex pattern changing in the circumferential direction of the can) on the can body has an excellent balance of cost and decoration effect. I found out.
However, if an irregular concavo-convex pattern is to be formed on the cylindrical can body portion, distortion occurs in the portions that become both ends of the can body, and therefore, the flange length formed at the open end portion of the can body varies. In particular, in a welded can, the opening end portion of the can body is difficult to be formed into a perfect circle due to the weld seam, so that distortion at both end portions of the can body is likely to occur.

Even if the variation in the length of the winding flange formed at the opening end of the can body is about 0.3 mm, it is easy to cause a winding sealing failure. When producing a deformed can having an irregular concavo-convex pattern on the portion of the member that becomes the can body, it was very important to reduce the occurrence of distortion at both ends of the can body.
However, since there is no appropriate technique that can reduce the occurrence of distortion at both ends of the can body, it has not been put into practical use to form irregular irregular patterns on the can body. It is.
In addition, even for such a can, it is important that the equipment for the existing cylindrical can is not changed, and it is also important to be put in the vending machine in the same manner as the existing cylindrical can. It was important to ensure adaptability to such existing facilities.

The present invention has been made in view of the above-mentioned problems of the prior art, and its purpose is to produce a modified can capable of simultaneously improving the decorative effect of the can and reducing the occurrence of deformation distortion that easily occurs during molding. It is to provide a method and an expanded mold .

In order to achieve the above object, the modified can manufacturing method of the present invention has a cylindrical shape as a whole, and an expanded mold formed by a plurality of segments divided around a central axis is formed in a cylindrical shape as a whole. placed, the expandable type from the inside of the can member radially outward and expanded radially, to the inner wall surface to press the can body on the end and the can of the outer wall surface the can member of each segment in variant can manufacturing method comprising expanding molding process to expand forming a can body diameter portion having a diameter larger than the barrel under the end portion, the expanding molding step corresponds to barrel upper end and can body lower portion which is not enlarged The upper and lower relief parts, and the can member expanding from the inner part of the can member to the lower part of the can body, pressing from the inner side of the can member to the outer side in the radial direction and having a predetermined dimension. Part The outer wall surface is provided with a diameter expansion corresponding portion for expanding the diameter of the can body portion of the can member, and the diameter expansion corresponding portion corresponds to an upper portion of the diameter expansion corresponding portion, and the can body of the can member Corresponding to the upper annular convex portion corresponding to the upper annular convex portion provided over the entire circumference of the upper portion of the enlarged diameter portion, and the lower portion of the enlarged diameter corresponding portion, the lower portion of the can body enlarged diameter portion of the can member A concave / convex pattern is formed from the lower annular convex corresponding part corresponding to the lower annular convex part provided over the entire circumference and the upper annular convex corresponding part of the enlarged diameter corresponding part to the lower annular convex corresponding part. A concave / convex pattern corresponding portion, the concave / convex pattern corresponding portion includes at least a concave pattern corresponding portion, and an upper end of the concave pattern corresponding portion is positioned below and radially inward of the upper annular convex corresponding portion, and The lower end of the concave pattern corresponding part is above the lower annular convex corresponding part and in the radial direction The concave portion corresponding to the upper annular convex portion corresponding portion and the lower annular convex portion corresponding portion are separated from the upper relief portion and the lower relief portion, and at least one segment of another segment A portion that becomes a can body of the cylindrical member using an expanding mold that is configured to have a concave / convex pattern corresponding portion that is different from the concave / convex pattern, and whose surface area of the outer wall surface of the diameter expansion corresponding portion of each segment is substantially the same. Is characterized by being expanded .

In the above-described modified can manufacturing method, the maximum area may be 1.1 times or less of the minimum area among the surface area of the portion that can expand the can body portion of the outer wall surface of each segment of the expand type. Is preferred.
In the modified can manufacturing method described above, the uneven pattern on the outer wall surface of each segment may be formed in substantially the same shape every other row.
The expandable mold of the present invention is disposed in a cylindrical can member, and a portion of the can member that becomes a can barrel enlarged portion is expanded from the inside to the outside in the radial direction, and is larger than the upper portion of the can barrel and the lower portion of the can barrel. in expanding type having an outer peripheral wall for a can body diameter portion of diameter, is a substantially cylindrical shape as a whole, is composed of a plurality of segments divided about its central axis, outer segments The wall surface has an upper relief portion and a lower relief portion corresponding to the upper end portion of the can barrel and the lower end portion of the can barrel, and the portion of the can member that becomes the upper portion of the can body and the portion that becomes the lower portion of the can body. A diameter expansion corresponding part for expanding the can body part of the can member until it becomes a can body diameter expansion part having a predetermined size by pressing from the inner side in the radial direction, and the diameter expansion corresponding part is corresponds to an upper portion of the enlarged diameter corresponding portion, the can member An upper annular projection corresponding portion corresponding to the upper annular protrusion provided me cotton all around the top of the can body diameter portion corresponds to the lower portion of the enlarged diameter corresponding portion, Kando拡of the can member and a lower annular projection corresponding portion corresponding to the lower annular protrusion provided me cotton all around the lower part of diameter, the lower annular protrusion corresponding portion from said upper annular protrusion corresponding portions of the enlarged diameter corresponding portion A concave-convex pattern corresponding portion formed with a concave-convex pattern, the concave-convex pattern corresponding portion including at least a concave-pattern corresponding portion, an upper end of the concave-pattern-corresponding portion below the upper annular convex-corresponding portion, and It is located radially inward, and the凹模-facing portion lower than the lower annular protrusion corresponding portion upwardly causes and is located radially inward, the凹模-facing portion, the upper annular protrusion corresponding portions and lower annular By the convex corresponding part, the upper relief part and the lower relief part are isolated from each other. , One segment even without less is configured to have an uneven pattern corresponding portions of different patterns and uneven pattern of the other segments, the surface area of the outer wall surface of the enlarged diameter corresponding portion of each segment is substantially identical It is a characteristic.

In the segment type, of the surface area of the outer wall surface of the enlarged diameter corresponding portion of the respective segment, Ru preferably der that maximum area is less than 1.1 times the minimum area.

Contact name as here cylindrical Jokan member, the upper end of the can body, of the bottom, referred to herein is at least one end is opened, which ends the upper and lower ends of the can body is opened, the can body Including upper end and lower end, one end is open.

As described above, according to the modified can manufacturing method according to the present invention, in the expanding process, the upper relief portion and the lower relief portion corresponding to the upper end portion of the can barrel and the lower end portion of the can barrel, and the upper annular convex portion are not expanded. Part corresponding part, lower annular convex part corresponding part, and concave / convex pattern corresponding part, the concave / convex pattern corresponding part includes at least a concave pattern corresponding part, and the upper end of the concave pattern corresponding part is higher than the upper annular convex part corresponding part. Is also positioned below and radially inward, and the lower end of the concave pattern corresponding portion is positioned above the lower annular convex portion and radially inward, and the concave pattern corresponding portion corresponds to the upper annular convex portion. The upper relief portion and the lower relief portion are separated from each other by the portion and the lower annular convex portion corresponding portion, and at least one segment is configured to have a concave / convex pattern corresponding portion having a pattern different from the concave / convex pattern of the other segment. The surface area of the outer wall surface of the enlarged diameter corresponding portion of each segment is expanded molded areas of can bodies of the cylindrical member with the expanding type are substantially the same, at the same time as improving the decorative effect of the can, molding It is possible to reduce the influence on the end portion of the can body opening of the deformation distortion that is likely to occur at the time.

Further, according to the expandable mold according to the present invention, the upper relief portion and the lower relief portion corresponding to the upper end portion of the can barrel and the lower end portion of the can barrel, the upper annular convex portion corresponding portion, and the lower annular convex portion corresponding portion, which are not expanded. The concave- convex pattern corresponding portion includes at least a concave-pattern corresponding portion, and the upper end of the concave-pattern-corresponding portion is positioned below the upper annular convex corresponding portion and radially inward, and is concave. The lower end of the pattern corresponding part is positioned above and radially inward of the lower annular convex part corresponding part, and the concave pattern corresponding part is formed by the upper annular convex part corresponding part and the lower annular convex part corresponding part. is isolated from the parts and the lower relief portion, at least one has an uneven pattern corresponding portions of different patterns and uneven pattern of the other segments, the surface of the outer wall surface of the enlarged diameter corresponding portion of each segment of the segment constituting the expanded type Since covering substantially identical, yet highly decorative effects can, it is possible to manufacture a small canister of easy deformation distortion occurs during molding.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.
Manufacturing Method FIG. 1 shows a schematic configuration of a split mold (expanding mold) used when performing a characteristic expanding molding process in a modified can manufacturing method according to an embodiment of the present invention. In the present embodiment, an example will be described in which an upper relief part is provided at the upper part of the outer peripheral wall of the split mold and a lower escape part is provided at the lower part of the outer peripheral wall.
In the present embodiment, the split mold 12 (same as the can barrel lower end 10b side, for example, is placed inside the cylindrical can member 10 (see FIG. 1A) having the can barrel upper end 10a and the can barrel lower end 10b side open. (See FIG. (B)). Here, the split mold is composed of segments 12a to 12j that are equally divided into ten equal parts around the central axis.
Then, by expanding the split mold 12 as shown in FIG. 10C, the can body 14 of the can member 10 is expanded, and the can body enlarged portion 16 as shown in FIG. It is formed on the can body 14 of the member 10.

That is, in FIG. 3C, a segment expansion wedge shaft (hereinafter referred to as wedge shaft) 20 is inserted into the hole 18 formed along the central axis of the divided mold 12 from below, and the arrow in the figure. By raising in the i direction, each of the expanding molding segments 12a to 12j constituting the split mold 12 is radially expanded in the direction of the arrow j in the figure, which is the outside in the radial direction.
By expanding the diameter of each of the expanding molding segments 12a to 12j, the upper annular convex portion 22a is formed over the entire circumference of the upper portion of the can body enlarged diameter portion 16 of the can member 10, and the can member 10 Between the part which becomes the upper annular convex part 22a and the lower annular convex part 22b of the cannula 14 of the can member 10 over the entire circumference of the part which becomes the lower part of the can body enlarged diameter part 16 In addition, the uneven pattern 24 is formed. Here, the uneven patterns formed on the outer wall surfaces of adjacent segments (for example, 12a and 12b) are different from each other. For this reason, the concavo-convex pattern 24 formed on the can member 10 changes in the concavo-convex pattern along the circumferential direction of the can member 10. In the present embodiment, the uneven pattern is an example of a spiral pattern wound around the can member 10. Further, in the present embodiment, the case where the uneven patterns formed in all the adjacent segments are different is shown, but of course, if the uneven patterns are different in at least a pair of adjacent segments, the can member extends along the circumferential direction. Can be formed.
By expanding the diameter of each of the expanding segments 12a to 12j by a predetermined amount to the outside in the radial direction, the can body enlarged portion 16 having a larger diameter than the can body upper portion 14a and the can body lower portion 14b as shown in FIG. The can body 10 is formed on the can body 14.

  Here, the upper annular convex portion 22a corresponds to the upper end of the can body enlarged diameter portion 16 of the can member 10, and is provided over the entire circumference of the upper portion of the can body enlarged diameter portion 16, and similarly the lower annular convex portion. The portion 22 b corresponds to the lower end of the can body enlarged portion 16 of the can member 10 and is provided over the entire circumference of the lower portion of the can body enlarged portion 16. These annular convex portions 22 a and 22 b are formed at the same height position of the can member 10. That is, the annular convex portion is formed to be parallel to the bottom surface or the top surface of the can member 10. Further, in the present embodiment, the amount of protrusion of the annular convex portion (the amount of radial expansion) is formed to be substantially the same over the entire circumference of the can. However, it is not always necessary to make the protrusion widths in the can axis direction of the upper annular protrusion and the lower annular protrusion equal. The concavo-convex pattern 24 includes a concave pattern 26 and a convex pattern 28 formed from the upper annular convex portion 22 a to the lower annular convex portion 22 b of the can body enlarged diameter portion 16 of the can member 10.

The concave pattern upper end portion 26a constituting the concavo-convex pattern 24 is positioned below the upper annular convex portion 22a and on the radially inner side of the can member 10 of the can. Thereby, the upper end part 26a of the concave pattern 26 and the can body upper part 14a of the can member 10 are isolated by the upper annular convex part 22a. Similarly, the concave pattern lower end portion 26b is located above the lower annular convex portion 22b and radially inward, and the can body lower portion 14b of the can member 10 and the lower end portion 26b of the concave pattern 26 are connected to the lower annular shape. It is isolated by the convex part 22b.
And in this embodiment, the surface area of the outer surface of the split mold 12 was made substantially the same in each segment 12a-12j. For this reason, the molding area of the can body enlarged diameter portion 16 corresponding to each segment is formed substantially the same in each row.

Here, that the area (the surface area of the can body enlarged portion of the segment, the molding area of the can body enlarged portion) is substantially the same, the maximum area is 1.1 times the minimum area or less. Say. More preferably, 1.06 times or less is desirable.
In the present embodiment, the cylindrical can member is shown in which both ends of the upper end and the lower end of the can body are open. However, it is sufficient that at least one end is open.

Expanding Device FIG. 2 shows a schematic configuration of an expanding device using a split mold according to an embodiment of the present invention.
In the figure, the longitudinal sectional view on the left side of the central axis 29 is an explanatory view after the split mold is expanded radially outward, and the longitudinal sectional view on the right side of the central axis 29 is the same split metal. It is explanatory drawing before expanding a type | mold to the radial direction outer side.
The expanding apparatus 30 shown in the figure includes the wedge shaft 20, the split mold 12, a mold holder 32, a can press guide 34, and a can hold 36.
Tapered portions 38 and 40 are provided on the outer peripheral wall of the wedge shaft 20 and the inner peripheral wall of the split mold 12, respectively. The wedge shaft 20 moves up and down while the tapered portion 38 slides on the tapered portion 40 of the split mold 12.
The split mold 12 includes a substantially cylindrical molding portion 42 that performs expansion molding, and a substantially disc-shaped holding portion 44 that is provided at a lower portion of the molding portion 42 and is held by the mold holder 32.

That is, the mold holding body 32 includes, for example, a substantially donut-shaped upper holding part 46 and a substantially donut-like lower holding part 48, and holds the holding part 44 of the divided mold 12.
A hole 50 is provided laterally on the outer peripheral wall of the holding portion 44 of the split mold 12, and a spring 52 contacts one end of the hole 50 with the end wall of the hole 50 and the other end with the inner peripheral wall of the upper holding portion 46. Has been inserted.
The can presser guide 34 presses the upper end of the can member 10 from above by a force such as a spring (not shown).
The can hold 36 holds the can body from the side by a force such as a spring (not shown), and supplies the can member 10 to the split mold 12 and discharges the can member 10 from the split mold 12. Make it.
The split mold 12 can be moved in the radial direction by moving the wedge shaft 20 in the vertical direction.

Therefore, during the expansion molding, the wedge shaft 20 is moved upward in a state where the upper end of the can member 10 is firmly pressed by the can press guide 34 as shown in the longitudinal sectional view on the left side of the central axis 29. . Then, since the tapered portion 38 of the wedge shaft 20 presses the tapered portion 40 of the split mold 12, the split mold 12 moves outward in the radial direction. Thereby, the expansion molding of the can member 10 by the outer peripheral wall of the divided mold 12 is performed.
Further, by moving the wedge shaft 20 downward, the split mold 12 moves inward in the radial direction by the reaction force of the spring 52. Thereby, for example, the can member 10 before the expansion molding can be easily set to the expanding device 30.

Split mold (expanded mold)
FIG. 3 shows a schematic configuration in which the holding portion 44 of the split mold 12 according to the embodiment of the present invention is omitted.
1A is an external perspective view of the split mold 12 according to the present embodiment, FIG. 1B is a view of the split mold 12 as viewed from above, and FIG. 1C is the split mold. It is the figure which looked at 12 from the side. Although FIG. 1 illustrates an example using a divided mold obtained by dividing the mold into 10 parts, FIG. 1 illustrates an example using a divided mold 12 in which the mold is divided into 12 at an equal angle around the central axis.
A split mold 12 shown in the figure is disposed in a cylindrical can member, and a portion of the can member that becomes a can body enlarged diameter portion is expanded from the inside to the outside in the radial direction. It has an outer peripheral wall for making the can body enlarged diameter part larger in diameter than the lower part. The split mold 12 is divided into a plurality of expanding segments 12a to 12l around the central axis.

On the outer peripheral wall of the split mold 12, an upper escape portion 54a, a lower escape portion 54b, and a diameter expansion corresponding portion 56 are integrally provided. The enlarged diameter corresponding portion 56 is provided with an upper annular convex portion corresponding portion 58a, a lower annular convex portion corresponding portion 58b, and an uneven pattern corresponding portion 60.
The concavo-convex pattern corresponding portion 60 includes a concave pattern corresponding portion 62 and a convex pattern corresponding portion 64.
Then, the upper end 62a (see FIG. 3C) of the concave pattern corresponding part 62 is positioned below the upper annular convex corresponding part 58a and radially inward, so that the upper end of the concave pattern corresponding part 62 is located. The part 62a and the upper relief part 54a are isolated by the upper annular convex part corresponding part 58a. Similarly, the lower end portion 62b of the concave pattern corresponding portion 62 and the lower relief portion 54b are positioned by positioning the lower end portion 62b of the concave pattern corresponding portion 62 above the lower annular convex portion corresponding portion 58b and radially inward. Are separated from each other by the lower annular convex portion corresponding portion 58b.

  Here, even if the wedge shaft 20 rises to the maximum extent so that the upper relief portion 54a does not increase the diameter of the upper portion of the can body of the can member due to the radially outward expansion of the outer peripheral wall of the split mold 12. The upper non-diameter portion that has an outer diameter that is smaller than the inner diameter of the can body and that is not enlarged is provided at the upper portion of the can body of the can member. Similarly, the lower relief portion 54b has an outer diameter that does not expand the portion of the can member 12 that becomes the lower portion of the can body even when the outer peripheral wall of the divided mold 12 expands radially outward. In this portion, a lower non-expanded portion that is not expanded is provided.

  The diameter expansion corresponding portion 56 is formed from the upper escape portion 54a to the lower escape portion 54b of the outer peripheral wall of the divided mold 12 and has a larger diameter than the escape portions 54a and 54b and starts from the portion that becomes the upper portion of the can body of the can member. The diameter of the can body is increased by pressing from the inner side toward the outer side in the radial direction toward the lower part of the body to increase the diameter. The upper annular convex portion corresponding portion 58 a corresponds to the upper portion of the diameter expansion corresponding portion 56 of the outer peripheral wall of the divided mold 12, and is provided over the entire circumference of the upper portion of the diameter expansion corresponding portion 56. In other words, in the present embodiment, the upper annular convex corresponding part 58a has the same height position (position in the axial direction of the can) and the same protruding amount (quantity in the radial direction of the can) in adjacent segments. It is provided as follows. Similarly, the lower annular convex portion corresponding portion 58 b corresponds to the lower portion of the diameter expansion corresponding portion 56 of the outer peripheral wall of the divided mold 12, and is provided over the entire periphery of the lower portion of the diameter expansion corresponding portion 56. The lower annular convex portion corresponding part 58b is also provided so that the adjacent segments have substantially the same height position (position in the axial direction of the can) and substantially the same protruding amount (amount in the radial direction of the can). ing.

The concavo-convex pattern corresponding portion 60 is a concave pattern corresponding portion 62 that changes in the circumferential direction of the outer peripheral wall of the divided mold 12 from the upper annular convex corresponding portion 58a of the divided mold 12 outer peripheral wall to the lower annular convex corresponding portion 58b. A convex pattern corresponding portion 64 is included. And each uneven | corrugated pattern corresponding | compatible part currently formed in the segments 12a-12l for an adjacent expand has a mutually different shape. In the present embodiment, the overall shape is a spiral pattern wound around the circumference. However, it is not necessary that the concavo-convex patterns of all the segments be different, and if the concavo-convex pattern of at least one segment is different from the other, the purpose of forming an irregular pattern on the can can be achieved.
Further, the respective surface areas of the diameter expansion corresponding portions 56 of the outer wall surfaces of the segments 12a to 12l are substantially the same. Here, the surface area being substantially the same means that the maximum area of each surface area is 1.1 times or less of the minimum area. More preferably, it is 1.06 times or less.

The split mold 12 according to the present embodiment is configured as described above, and the operation thereof will be described below.
Conventionally, when a can body of a cylindrical can member is expanded and a pattern that changes in the circumferential direction such as a spiral uneven pattern is formed on the surface of the can body, a circular cross section of the opening end of the can body Will be distorted. In particular, when the metal can is a welded can, the cross section of the welded can body (glasses can) is not completely circular, so that the distortion can be easily promoted. If the opening end of the can body is flanged in this state, the length of the flange varies. For example, with respect to the allowable range of 0.2 mm, a larger variation of 0.3 mm occurs, which may cause a tight sealing failure, leading to a serious defect in quality.

As a result of investigating the cause of the variation in the length of the flange in this way, when the diameter of the mold is enlarged, the protrusion amount of the adjacent segment is different in the portion close to the opening end of the can body. It can be seen that the segment part first contacts the inner surface of the can body and the inner surface of the can body corresponding to this part is sharply expanded, resulting in distortion of the circular shape at the open end of the expanded can body. It was.
When flange forming is performed while the opening end is distorted as described above, it has been found that the flange length on the short diameter side tends to be long as a result of the flanger roll non-uniformly contacting the inner surface of the opening end.
Therefore, in the present embodiment, first, the upper annular convex portion corresponding portion 58a and the lower annular convex portion corresponding portion 58b are provided in the diameter expansion corresponding portion 56 of the split mold 12, and the lower annular convex portion is extended from the upper annular convex portion corresponding portion 58a. An uneven pattern corresponding portion 60 is provided over the portion corresponding portion 58b.

As a result, by positioning the position of the upper end 62a of the concave pattern corresponding part 62 below the upper annular convex corresponding part 58a and radially inward, the upper end 62a and the upper relief part 54a of the concave pattern corresponding part 62 Are isolated by the upper annular convex corresponding part 58a. Similarly, by positioning the lower end 62b of the concave pattern corresponding portion 62 above the lower annular convex portion corresponding to the lower annular convex portion 58b and radially inward, the lower end 62b and the lower relief portion 54b of the concave pattern corresponding portion 62 are provided. However, it is isolated by the lower annular convex part corresponding part 58b.
By using such a divided mold 12, the can member 10 is expanded as follows. That is, in the expand molding process, the upper annular convex portion provided over the entire circumference of the portion that becomes the upper portion of the can body enlarged portion of the can member and the entire circumference of the portion that becomes the lower portion of the can body enlarged portion of the can member. The expanded diameter of the lower annular convex portion provided over the expanded molding is larger than the diameter of the concave pattern in the concavo-convex pattern changing along the circumferential direction between the upper annular convex portion and the lower annular convex portion. The can member is expanded so as to be large.

As a result, compared to the case without such ingenuity in the forming method, the radius of the annular convex portion over the entire circumference in the circumferential direction of the can body is larger than the diameter of the concave pattern of the concave and convex pattern as in this embodiment. By projecting outward in the direction, it is possible to greatly reduce the occurrence of deformation distortion itself at the opening end of the can body during the formation of the concavo-convex pattern. That is, in the can member 10, the upper end portion 26a of the concave pattern 26 and the upper portion 14a of the can body are separated from each other by the upper annular convex portion 22a, and the lower end portion 26b of the concave pattern 26 and the lower portion 14b of the can body are separated from each other. Even if some deformation distortion occurs in the can body when forming the concavo-convex pattern 24 in the can body enlarged diameter portion 16 by being isolated by 22b, the formation distortion can be reduced by forming the annular convex portions 22a and 22b. Do not propagate in the direction of the upper end 10a and the lower end 10b of the can body, or correct it. Thereby, it can prevent that a distortion distortion generate | occur | produces in the cylindrical can barrel upper end 10a and the can barrel lower end 10b.
Furthermore, as a result of investigations by the present inventors, it was confirmed that the deformation strain can be further reduced by configuring the surface area of the diameter expansion corresponding portion of each segment of the split mold to be substantially the same in each segment. .

That is, when the surface area of the outer wall surface of each segment is different, the molding area of the can body portion corresponding to each segment after molding is different for each segment. As a result, since the tensile stress in the axial direction of the can body portion corresponding to each segment differs between the segments, the can height and the flange length of the can member corresponding to each segment can vary.
On the other hand, in this embodiment, since the outer surface area of each segment of the split mold is substantially the same in each segment, the can height (expand height) and flange length of the molded can member corresponding to each segment The variation in thickness can be suppressed. FIG. 4 is a diagram in which the outer wall surfaces of the expanded segments of this embodiment are arranged in a plane. In the figure, the convex portion is indicated by hatching. Moreover, in this embodiment, the case where all the protrusion amounts of a convex part were the same was shown.

As can be seen from FIG. 4, the surface areas of the segments 12 a to 12 i are the same (except for errors during manufacturing). The surface areas of the segments 12j to 12l are larger than the surface areas of the segments 12a to 12i because there are more connecting portions of the concave portions 62 and the convex portions 64 than the other segments 12a to 12i. However, as a result of confirmation by the present inventors, if the maximum surface area of each segment is 1.1 times or less than the minimum surface area, the can height and flange length variation after formation can be sufficiently suppressed. I understood that. That is, the surface area of each segment may be treated as being substantially equal when the maximum area therein is 1.1 times or less the minimum area.
Thus, if the surface area of the diameter expansion corresponding part of each segment mold constituting the expand mold is substantially equal in each segment, the molding area of the portion corresponding to each segment of the can member is substantially equal to each other. This makes it possible to suppress variations in can height and flange length after formation.

Here, the case where the height of the convex part is constant throughout is explained, but even in a can where the height of the convex part is changed within each segment, the diameter of each segment can be expanded. If the surface area of the part is made equal in the above range, the same effect can be obtained. However, the maximum protrusion amounts of the convex portions in each segment are all made substantially the same. That is, the maximum diameter expansion amount in the can body portion corresponding to one segment is formed substantially the same over all the segments.
As described above, according to the modified can manufacturing method and the divided mold 12 according to the present embodiment, the uneven pattern 24 whose pattern changes along the circumferential direction of the can excellent in the decorative effect on the can body 14 of the can member 10. By molding, the can member 10 can be given an irregular pattern in addition to the regular appearance pattern, and various changes can be made to the appearance design by various combinations. Thereby, compared with the thing of a regular pattern, a variation can be given to an external appearance and differentiation with other goods can be aimed at.

  Moreover, in the present embodiment, when forming the concavo-convex pattern 24, molding is accompanied by pattern molding with a simple and inexpensive configuration in which the annular convex portions 22 a and 22 b are provided at both ends of the can body enlarged diameter portion 16. The influence of distortion on the open end portions 10a and 10b of the can body 14 can be minimized. Therefore, even if such circular opening end portions 10a and 10b are flange-formed, the variation in the length of the flange can be made, for example, 0.2 mm or less, which is an allowable manufacturing range. Can be prevented. Furthermore, since the surface area of the outer wall surface of each segment is made substantially the same, variations in the flange length can be more reliably suppressed.

<Upper relief part>
As the split mold, it is also possible to use a mold that does not have an escape portion, that is, an upper escape portion 54a, at a portion corresponding to the upper portion of the can body of the split mold 12.
However, as shown in FIG. 3, providing the upper relief portion 54a and the lower relief portion 54b on the outer wall of the split mold 12 is not provided with the upper relief portion 54a, but only providing the lower relief portion 54b. Since the edge portion of the mold is not formed from the substantially annular convex portion to the end portion of the can body, the inner surface is prevented from being damaged, which is preferable in terms of the inner surface quality.

<Can member after flange molding>
According to the modified can manufacturing method and the split mold according to the present embodiment, when the opening ends 10a and 10b having a circular cross section are formed by flange, the variation in the length of the flange is within an allowable range, for example, 0.2 mm or less. Can do. Thereby, generation | occurrence | production of a winding tightening poor sealing can can be prevented. After performing the seamer process on the can member after the flanger process, providing a can lid at one open end of the can body, filling the contents, and then providing a can bottom at the other open end of the can body, Can be produced.

Modified Can FIG. 5 shows a schematic configuration of a deformed can manufactured by a split mold and a modified can manufacturing method according to an embodiment of the present invention.
5A is a view of the deformed can according to the present embodiment as viewed from above, FIG. 5B is a view of the deformed can as viewed from the bottom, and FIG. 5C is a view of the deformed can from the side. FIG. FIG. 6 is a development view of the can body portion of the deformed can.
The can 67 shown in FIG. 5 is provided with a can lid 68 and a can bottom 70 at the upper and lower ends of the can member after the expansion molding, respectively. The can barrel upper portion 14a and the can barrel lower portion 14b are respectively expanded. An upper non-expanded portion and a lower non-expanded portion that are not diameters. The diameter is increased radially outward from the upper non-expanded portion of the upper portion 14a of the can body to the lower non-expanded portion of the lower portion 14b of the can body. This is the can body enlarged diameter portion 16.

In the present embodiment, the can body enlarged diameter portion 16 is provided with an upper annular convex portion 22a, a lower annular convex portion 22b, and an uneven pattern 24 that changes along the circumferential direction.
And the upper end part 26a of the concave pattern 26 and the upper part 14a of the can body are formed by positioning the position of the upper end part 26a of the concave pattern 26 constituting the concave-convex pattern 24 below the upper annular convex part 22a and radially inward. Are isolated by the upper annular convex portion 22a. In addition, by positioning the lower end portion 26b of the concave pattern 26 above the lower annular convex portion 22b and radially inward, the lower end portion 26b of the concave pattern 26 and the can body lower portion 14b are moved by the lower annular convex portion 22b. It is isolated.
Here, the upper annular convex portion 22 a corresponds to the upper portion of the can barrel enlarged portion 16, and is provided over the entire circumference of the upper portion of the can barrel enlarged portion 16. The lower annular convex portion 22 b corresponds to the lower portion of the can barrel enlarged portion 16 and is provided over the entire circumference of the lower portion of the can barrel enlarged portion 16.

The concavo-convex pattern 24 includes a concave pattern 26 and a convex pattern 28 that change in the circumferential direction of the can body 16 from the upper annular convex portion 22 a to the lower annular convex portion 22 b of the can body 16. In the present embodiment, the concave pattern 28 has a spiral shape wound around the can.
As a result, the modified can 67 has variations in the regular appearance pattern, and has a concavo-convex pattern 24 that is rich in change and has an interesting taste, so that the decoration effect of the can body 14 can be improved and the shape of the container can be improved. Differentiate from other products.

Further, since the deformed can 67 is manufactured by the above-described deformed can manufacturing method, when the can is virtually divided at an equal angle around the center axis of the can, the forming of the virtually divided can body surface is performed. There is at least one division that has substantially the same area. That is, as shown in the development view of the can in FIG. 6, when the part is virtually divided into parts corresponding to the respective segments of the split mold (parts sandwiched by a chain line in the figure), the molding area of each part is It becomes substantially the same. Here, “substantially the same” means that the maximum area of the molding area of each part is 1.1 times or less (more preferably 1.06 times or less) of the minimum area. To tell.
As described above, since the modified can 67 is manufactured by the split mold and the modified can manufacturing method according to the present embodiment, it has been difficult to solve the problem in the past, when the uneven pattern 24 is formed on the can body 14. Occurrence of molding distortion at the open end is greatly reduced.

<Number of spiral turns>
In the spiral concavo-convex pattern 24 of the present embodiment, it is preferable that the number of spiral turns is an integral multiple. Therefore, in this embodiment, the spiral concavo-convex pattern 24 is formed in a two-roll configuration.
That is, when the inclined uneven pattern 24 is formed in a spiral shape, by forming the number of turns thereof as an integral multiple, the molding stress due to the inclined convex pattern 28 acts evenly in the circumferential direction, and the deformation distortion of the can body 14 is further increased. In addition, the side wall strength can be increased by the synergistic effect with the expansion molding, which is advantageous for reducing the thickness of the plate.
Further, when the can filled with the contents in the deformed can 67 is heat sterilized, the spiral of the spiral concavo-convex pattern 24 formed in the can body enlarged diameter portion 16 even if the can 67 is in close contact with the adjacent can 67 without any gap. Steam and cooling water can easily pass through the concave pattern 26 and easily reach the center of the can body 14, and heating efficiency and cooling efficiency can be further improved as compared with a modified can with a conventional shaped pattern. it can.

<Position of annular projection>
The selection of the positions of the annular protrusions 22a and 22b is very important from the viewpoint of improving the adaptability of the modified can 67 to the existing equipment.
That is, with regard to suitable positions of the annular protrusions 22a and 22b, the present inventors, for example, in existing equipment for a 202-diameter cylindrical can, 10% or more of the can height from the upper end of the can body and the lower end of the can body, 20 We paid attention to the fact that the can is supported at a position below%.
And even if it is the can body 14 of the deformed can 67, if the annular convex parts 22a and 22b of the deformed can 67 are located within the preferable range and have substantially the same diameter, the equipment for the cylindrical can can be used. Since the modified can can be supported, it was found that the can body of the modified can 67 can be handled in the same manner as an existing cylindrical can body.

Therefore, in the present embodiment, in the modified can, the vertical length between the upper end portion of the can body 14 and the upper annular convex portion 22a, that is, the position of the annular convex portion 22a is 10% or more and 20% or less of the can height. And Further, the length in the vertical direction between the lower end of the can body 14 and the lower annular protrusion 22b, that is, the position of the annular protrusion 22a is set to 10% or more and 20% or less of the can height. And it is preferable to make the outer diameter of annular convex part 22a, 22b into substantially the same diameter.
For example, in this embodiment, for the can 67 having a can height of about 104.7 mm, the upper annular protrusion 22a is formed at a position about 15 mm from the upper end of the can 67, and the lower annular protrusion 22b is deformed. The can 67 is molded at a position about 15 mm from the lower end. Further, in the modified can 67, the outer diameter is, for example, 52.74 mm. Thereby, the equipment for cylindrical cans can support the deformed can 67 by the annular convex portions 22 a and 22 b of the can body 14.

Therefore, in the present embodiment, the can body 14 of the deformed can 67 can be handled in the same manner as a can body of a normal cylindrical can, so that existing equipment for a cylindrical can can be used almost as it is.
When the positions of the annular protrusions 22a and 22b are provided at positions closer than 10% of the can height from the upper end of the can body and the lower end of the can body, respectively, the annular protrusions 22a, 22b and 202 diameter of the deformed can 67 Interference with equipment for cylindrical cans. In particular, the adaptability to facilities such as flangers and seamers for 202 diameter cylindrical cans may be reduced.

On the other hand, if the annular protrusions 22a and 22b are provided at positions higher than 20% of the can height from the upper end of the can body and the lower end of the can body, the annular protrusions at the time of rolling at the annular protrusions 22a and 22b. The portions 22a and 22b cannot be supported, and the stability is deteriorated. For example, in an automatic vending machine, it becomes difficult to roll linearly with an annular convex portion, and it may not be possible to handle it like a can body of a cylindrical can.
Also from this point, in the present embodiment, the vertical positions of the annular protrusions 22a and 22b may be 10% or more and 20% or less of the can height from the upper end of the can body and the lower end of the can body, respectively. Highly preferred.

Modifications The present invention is not limited to the above-described configurations, and various modifications are possible within the scope of the gist of the invention.
As a variation of the concavo-convex pattern that is expanded in the can body, the ones shown in FIGS. FIG. 7A shows a deformed can whose corrugated pattern is a wave pattern, and FIG. 7B shows a deformed can whose corrugated pattern is a bubble (substantially hemispherical). Further, the portions corresponding to the deformed can in FIG.
The can of FIG. 7A has a corrugated pattern in the shape of a wave pattern in which the concave pattern 126 vibrates in the vertical direction of the can along the circumferential direction of the can 167.
In the can of FIG. 7B, the convex pattern 128 is formed in a bubble shape (substantially hemispherical). In the figure, the bubble-like sizes of the four rows of concavo-convex patterns and the three rows of concavo-convex patterns are the same, but the surface area of the annular convex portions is the same in each row, and the three rows of convex portions are The surface area is made equal by making the size larger than the four rows of convex portions. In this way, the appearance can be varied and the decoration effect can be improved.

FIG. 8 shows a front view of a deformed can having an uneven pattern with an inclined ring shape. The portion corresponding to the deformed can in FIG. The concave / convex pattern in FIG. 8 is a ring shape in which the concave pattern 126 is provided over the circumference of the can, and the ring has an inclined ring shape inclined with respect to the bottom or top of the can.
The above embodiments can also be applied to cans formed by drawing and ironing, thin-walled deep drawing cans, cans formed into bottle molds, etc., but application to welded cans that are prone to circular distortion reduces formation defects. This is more effective because the effect of (1) is remarkably obtained.

An example of a manufacturing process using a welded can is described below. First, forming and welding are performed before the expanding process. In forming, a rectangular thermoplastic resin-coated steel plate (for example, 0.22 mm in thickness, 108.7 mm in length, 158.2 mm in width) having a decorative or trademark printed on the outer surface and anti-corrosion treatment on the inner surface is formed into a cylindrical shape. Round. For forming, the ends of the steel plates rolled into a cylindrical shape are slightly overlapped, the overlapped portion is sandwiched between copper wire electrodes of a welding machine, and electric resistance welding is performed. This is a cylindrical can member (for example, an outer diameter of about 50.44 mm). An expansion molding process (see FIG. 1 and the like) characteristic in the present embodiment is performed on the can member after the anticorrosion treatment in which the inner and outer surfaces of the welded overlapping portion are coated with a polyester film or a correction paint. In the expanding molding process, a split mold is inserted inside the cylindrical can member, the split molds are simultaneously spread outward in the radial direction, and the shape of the outer peripheral wall of each split mold is the can body of the cylindrical can member. It is copied.
Here, the outer diameters of the upper non-expanded portion and the lower non-expanded portion of the can member are approximately 50.44 mm, which is the outer diameter of the cylindrical can member before the expansion.

On the other hand, the outer diameters of the vertices of the annular convex portions have the same outer diameter, and are expanded to about 52.74 mm. In addition, for the expected can height of about 104.7 mm, the distance from the upper end surface of the can member to the maximum expanded portion (maximum expanded portion) of the upper annular convex portion, and the maximum expanded portion of the lower annular convex portion from the lower end surface of the can member The distances up to are within the range of about 15 mm or more and 18 mm or less, respectively.
Next, when flanges are formed with flangers at both ends of the thus formed can member, the can member according to the present embodiment as described above is obtained. Then, an easy open can lid (EOE) is attached to one of the flanges of the can member with a seamer. At this time, the outer diameter of the lid attached to the flange of the odd-shaped can is about 52.3 mm.

Thereafter, a soft drink or the like is filled into the can member fitted with EOE from the bottom side opening end, and after filling, a bottom lid is attached to the flange of the bottom side opening end portion, whereby a can of different shapes is manufactured. At this time, the outer diameter of the bottom lid is about 52.3 mm, similar to the outer diameter of the lid. The height (can height) from the bottom surface of the bottom lid to the top surface of the lid is 104.7 mm, and the internal volume is 182 ml.
Here, assuming that the original diameter of the can body is 200 diameters and is the same as the neck diameter of the current 202 diameter 190 ml can, if the flange processing is performed, the lid tightening portion has almost the same shape as the current can, for example, the 202 diameter 190 ml can. Become.
In the above configuration, an example has been described in which a can member in which the upper annular convex portion, the lower annular convex portion, and the convex and concave patterns of the concavo-convex pattern have the same diameter and project outward in the radial direction is obtained by expanding molding. However, the present invention is not limited to this, and a can member as shown below can be used as long as molding distortion can be prevented.

That is, as the can member of the present invention, as long as the annular convex portion projects outward in the radial direction from the concave pattern of the concave and convex pattern, for example, the upper annular convex portion and the lower annular convex portion have the same diameter and the concave and convex pattern. The can member may protrude outward in the radial direction from the convex pattern, or conversely, the upper annular convex part and the lower annular convex part have the same diameter, and the concave and convex pattern convex pattern is the upper annular convex part and the lower part. It is also possible to use a can member that projects outward in the radial direction from the annular convex portion.
As described above, in the expanding process using the expanding mold (divided mold) according to the present embodiment, the convex pattern portion corresponding to the irregular concavo-convex pattern of the can member and the upper annular convex portion of the enlarged diameter portion, and Molding of the portion corresponding to the lower annular convex portion is started at the same time, and then the concave pattern portion between the upper annular convex portion and the lower annular convex portion of the enlarged diameter portion is formed with a slight delay. For this reason, in this embodiment, generation | occurrence | production itself of the deformation distortion of a can body is reduced significantly. In addition, when forming the concavo-convex pattern, even if molding distortion of the can body occurs, propagation of the molding distortion to the end of the can body opening can be blocked by the upper annular protrusion and the lower annular protrusion. Therefore, distortion can be prevented from occurring at the cylindrical opening end. Furthermore, since the molding area of the can body portion expanded by each segment of the expanding mold (split mold) is formed substantially the same in each row, the height of the can and the flange length after the expanding molding The variation is further reduced. Thereby, the improvement of the decoration effect of a can and the influence of the deformation distortion which is easy to generate | occur | produce in the case of shaping | molding on the can barrel opening end part can be reduced.

  In addition, if the outer diameter of the apex of the annular convex portion of the deformed can is substantially the same as the outer diameter of the existing general cylindrical can, it has the same action as the general cylindrical can body in the existing equipment. Become. That is, when manufacturing an irregular shaped can, existing facilities such as a general cylindrical can filling machine, a flanger, and a seamer can be used without significant modification. Furthermore, the modified can according to the present embodiment can be handled in substantially the same manner as a general 202-diameter cylindrical can without significantly modifying the customer's equipment for the cylindrical can. For example, it can be put in a vending machine in the same manner as a cylindrical can of 202 diameter and 190 ml. In addition, when a can manufacturing company establishes a new manufacturing facility, a neck facility is not necessary. As described above, the modified can manufacturing method and the modified can according to the present embodiment can be configured to be applicable to existing equipment for cylindrical cans.

It is explanatory drawing of the expand shaping | molding process by the expand type | mold concerning one Embodiment of this invention. It is explanatory drawing of schematic structure of the expanding apparatus using the expand type | mold concerning one Embodiment of this invention. It is explanatory drawing of the schematic structure of the expand type concerning one Embodiment of this invention. It is a figure for demonstrating the expand-type outer surface shape concerning one Embodiment of this invention. It is explanatory drawing of schematic structure of the deformed can concerning one Embodiment of this invention. It is an expanded view of the can body part of the deformed can concerning one Embodiment of this invention. It is explanatory drawing of schematic structure of the deformed can concerning one Embodiment of this invention. It is explanatory drawing of schematic structure of the deformed can concerning one Embodiment of this invention.

Explanation of symbols

10 Can member 12 Split mold (expanded mold)
14a Can body upper part 14b Can body lower part 16 Can body enlarged diameter part 22a Upper annular convex part 22b Lower annular convex part 24 Concave pattern 26 Concave pattern 28 Convex pattern 67 Deformed can

Claims (5)

An expanded mold having a substantially cylindrical shape as a whole and having a plurality of segments divided about its central axis is disposed in the cylindrical can member, and the expanded mold is arranged in the radial direction from the inside of the can member. The diameter of the can body expands radially outward, and the outer wall surface of each segment presses the inner wall surface of the can member, thereby expanding the can body diameter-expanded portion larger than the can body upper end and the can body lower end. In the modified can manufacturing method including the expanding molding process,
The expanding molding process includes
An upper relief portion and a lower relief portion corresponding to the upper end portion of the can body and the lower end portion of the can body that do not expand,
A can of the can member is pressed from the inner part of the can member to the lower part of the can body from the inside of the can member to the outer side in the radial direction until a can body enlarged portion having a predetermined size is obtained. The outer wall surface is provided with a diameter expansion corresponding portion for expanding the trunk portion,
The diameter expansion corresponding part is
An upper annular convex corresponding portion corresponding to the upper annular convex portion provided over the entire circumference of the upper portion of the can body enlarged diameter portion of the can member,
A lower annular projection corresponding portion corresponding to a lower annular projection provided over the entire circumference of the lower portion of the can body enlarged diameter portion of the can member;
A concave / convex pattern corresponding part in which a concave / convex pattern is formed from the upper annular convex corresponding part of the diameter expansion corresponding part to the lower annular convex corresponding part,
With
The concave / convex pattern corresponding portion includes at least a concave pattern corresponding portion, the upper end of the concave pattern corresponding portion is positioned below and radially inward of the upper annular convex corresponding portion, and the lower end of the concave pattern corresponding portion is the lower annular The concave pattern corresponding part is separated from the upper relief part and the lower relief part by the upper annular convex part corresponding part and the lower annular convex part corresponding part. ,
At least one segment is configured to have a concavo-convex pattern corresponding portion with a pattern different from the concavo-convex pattern of the other segments,
A method for manufacturing a deformed can, comprising: expanding a portion of the cylindrical member that becomes a can body using an expanding mold having substantially the same surface area of an outer wall surface of a diameter expansion corresponding portion of each segment. The method for manufacturing a deformed can according to claim 1,
A variant can manufacturing method characterized in that the maximum area is 1.1 times or less the minimum area of the surface area of the portion of the expandable segment where the can body portion of the outer wall surface can be expanded. In the manufacturing method of the deformed can according to claim 1 or 2,
The method for manufacturing a deformed can, wherein the uneven pattern on the outer wall surface of each segment is formed in substantially the same shape every other row. A portion of the can member, which is disposed in the cylindrical can member, is expanded from the inner side to the outer side in the radial direction from the inner side, and the can body having a larger diameter than the upper end portion of the can body and the lower end portion of the can body is expanded. In the expand type with the outer peripheral wall to make the diameter part,
The overall shape is substantially cylindrical, and is composed of a plurality of segments divided around its central axis,
The outer wall surface of each segment has an upper relief portion and a lower relief portion corresponding to the upper end portion of the can body and the lower end portion of the can body, which are not expanded,
A can of the can member is pressed from the inner part of the can member to the lower part of the can body from the inside of the can member to the outer side in the radial direction until a can body enlarged portion having a predetermined size is obtained. A diameter expansion corresponding part for expanding the body part;
With
The diameter expansion corresponding part is
An upper annular convex corresponding portion corresponding to the upper annular convex portion provided over the entire circumference of the upper portion of the can body enlarged diameter portion of the can member,
A lower annular projection corresponding portion corresponding to a lower annular projection provided over the entire circumference of the lower portion of the can body enlarged diameter portion of the can member;
A concave / convex pattern corresponding part in which a concave / convex pattern is formed from the upper annular convex corresponding part of the diameter expansion corresponding part to the lower annular convex corresponding part,
With
The concave / convex pattern corresponding portion includes at least a concave pattern corresponding portion, the upper end of the concave pattern corresponding portion is positioned below and radially inward of the upper annular convex corresponding portion, and the lower end of the concave pattern corresponding portion is the lower annular The concave pattern corresponding part is separated from the upper relief part and the lower relief part by the upper annular convex part corresponding part and the lower annular convex part corresponding part. ,
At least one segment is configured to have a concavo-convex pattern corresponding portion with a pattern different from the concavo-convex pattern of the other segments,
An expanding type characterized in that the surface area of the outer wall surface of the diameter expansion corresponding part of each segment is substantially the same. In the expanded mold according to claim 4,
An expanded type characterized in that the maximum area is 1.1 times or less of the minimum area of the surface area of the outer wall surface of each segment corresponding to the diameter expansion.

Images