JPH10328772A - Can body and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a can body which has a high deformation strength, such an excellent appearance that print on the outer face of a can drum is clearly seen and is easily produced, and to provide a producing method of the can body being easily formed. SOLUTION: Plural numbers of the same rectangular shaped flat planes 5 are formed in the circumference direction and the can axial direction of a can drum 2. The flat planes 5 adjoined in the circumference direction are arranged mutually connectedly through a boundary peak line 6, the flat planes 5 adjoined in the can axial direction are arranged with their positions mutually shifted at a prescribed interval in the circumference direction. At the position between the adjoining flat planes 5 in the can axial direction, connecting peak lines 7 to bind the upper boundary peak line 6 and the lower boundary peak line 6 are formed, and triangular shaped slopes 8, 9 inclining from the mutually adjoining pair of connecting peak lines 7 toward the upper and lower peripheries of the flat plane are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a can body having a cylindrical can body and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, there has been known a can body having a large number of depressions formed on the entire circumference of a can body as disclosed in Japanese Patent Publication No. 7-102417. In this type of can, an axial arrangement of a large number of depressions is arranged with a phase difference, whereby
Higher deformation strength than the bead reinforcement structure can be obtained. However, since the outer surface of the can body is formed with irregularities or inclined surfaces that are continuous in a wavy manner by a large number of depressions, the printing of characters and the like applied to the outer surface of the can body is hardly distorted, and the appearance is preferable. Absent.

In view of this, it is conceivable to provide a plurality of flat surfaces instead of the above-mentioned depressions so as to make the printing distortion applied to the outer surface of the can body small and easy to see. That is, FIG.
As shown in FIG. 5, a plurality of identical rectangular flat surfaces 51 are formed in the circumferential direction and the axial direction of the can body 50. The flat surfaces 51, 51 adjacent to each other in the circumferential direction are connected to each other via a boundary ridge line 52.
A polygonal shape is formed when 0 is viewed in cross section. In addition, the flat surfaces of the can body 50 adjacent to each other in the can axis direction 5
In order to obtain high deformation strength, the members 1 and 51 are arranged at positions shifted from each other in the circumferential direction. Thereby, a large number of flat surfaces 51 can be formed while maintaining high deformation strength, and the printing distortion of characters and the like applied to the outer surface of the can body 50 becomes smaller than that provided with a number of depressions. It can be easy to see.

[0004]

However, since the flat surfaces 51, 51 adjacent to each other in the axial direction of the can body 50 are arranged so as to be shifted from each other in the circumferential direction, an extreme step is formed at the boundary between them. (A triangular horizontal surface formed in the diameter direction of the can body) 53 is formed. The flat surface 51 is attached to the can body 50.
For example, although not shown, the canopy 54
The can body 50 whose bottom cover 55 and the bottom lid 55 have not yet been tightened is pressed against the inside and outside of the can body 50 by a mold. At this time,
Since the step 53 is bent at a substantially right angle when the two molds are pressed against each other, if the inner surface of the can body 50 is coated, there is a disadvantage that the inner surface of the step 53 is damaged.

An object of the present invention is to provide a can body which can obtain high deformation strength, can easily be printed on the outer surface of a can body, has a good appearance, and is easy to manufacture. Still another object of the present invention is to provide a method for manufacturing a can, which can easily form the can.

[0006]

In order to achieve the above object, a can body of the present invention has a plurality of identical rectangular flat surfaces formed in the circumferential direction and the axial direction of the can body. The flat surfaces adjacent to each other are arranged to be continuous with each other via a boundary ridge line, thereby forming a polygonal shape when the can body is viewed in a transverse cross section, and the flat surfaces adjacent to each other in the can axis direction are mutually predetermined. The lower surface of the upper boundary ridge line and the lower flat surface located immediately below the boundary ridge line are arranged at positions between the flat surfaces adjacent to each other in the can axis direction, which are arranged so as to be displaced in the circumferential direction with an interval. A pair of connecting ridges connecting the upper ends of a pair of boundary ridges on both sides of the pair are formed, and a triangle-shaped inclined surface that is inclined from the pair of adjacent connecting ridges toward the lower edge of the upper flat surface, and adjacent to each other A triangle that slopes from a pair of connecting ridges to the upper edge of the lower flat surface Wherein the the Jo inclined surfaces are formed alternately in the circumferential direction.

The can body of the present invention is provided with a plurality of identical rectangular flat surfaces in the circumferential direction and axial direction of the can body. In the circumferential arrangement, each flat surface is formed continuously through the boundary ridge line in the axial direction so that the shape of the cross section of the can body in a cross-sectional view is polygonal, and in the axial arrangement, it is located in the circumferential direction. Are staggered. Thereby, high deformation strength can be obtained with respect to an external pressure or an internal pressure in the axial direction or the radial direction. Furthermore, since a plurality of flat surfaces are formed on the outer surface of the can body, the distortion of printing applied to the outer surface of the can body can be reduced, and the print can be easily viewed and the appearance can be improved.

The inclined surface is formed between flat surfaces arranged in the axial direction of the can body. The inclined surface is formed on the upper edge and the lower edge of the flat surface by a pair of connecting ridges adjacent to each other, so that an extreme step is not formed between the flat surfaces adjacent in the axial direction. Therefore, even if the flat surfaces adjacent to each other in the axial direction of the can are displaced from each other in the circumferential direction, since the inclined surfaces are formed between the upper and lower flat surfaces, the molding amount is small and the molding is easy. be able to.

The method of manufacturing the can according to the present invention is characterized in that a cylindrical inner roll having a plurality of hexagonal concave portions formed in a honeycomb shape all around the outer surface is provided in an axial direction inside a cylindrical can body. And a flat surface forming portion corresponding to the concave portion of the inner die roll and curving in the circumferential direction for forming the flat surface, and an inclined surface forming portion for forming the inclined surface are formed all around the outer surface. The outer die roll is pressed against the inner die roll from the outer surface side via a can body, and the flat surface and the inclined surface are formed on the entire circumference of the can body by rotating both rolls. I do.

An apparent hexagonal pattern is formed on the can body from a rectangular flat surface and a pair of triangular slopes connected to its upper and lower edges. Corresponding to this pattern, a plurality of hexagonal concave portions are formed in a honeycomb shape on the entire outer surface of the inner die roll. In the outer die roll, a plurality of flat surface forming portions corresponding to the concave portions of the inner die roll and the above-mentioned inclined surface forming portion are formed all around the outer surface.

At this time, as one of the aspects of the outer die roll, a hexagonal shape in a side view is formed from the flat surface forming portion and the inclined surface forming portion corresponding to the concave portion of the inner die roll. A plurality of protrusions may be arranged in a honeycomb shape. Further, as another aspect of the outer die roll, the flat surface forming portion is a plurality of convex portions having a substantially square shape in a side view, and the inclined surface forming portion corresponds to a forming position of the inclined portion. And a recessed groove portion provided as described above.

Even when the outer roll of any of the above embodiments is employed, the flat surface can be reliably formed on the can body by pressing the flat surface forming portion of the outer roll onto the can body. Further, when the inclined portion is provided with an inclined surface forming portion in a convex shape, it is possible to reliably form the inclined portion between flat surfaces adjacent in the axial direction by pressing the inclined surface forming portion against the can body. When the inclined surface forming portion is the groove portion, when the flat surface forming portion forms the boundary ridge line between the flat surfaces by striking the upper and lower ends, the space such as the groove portion is simply arranged. The inclined portion is easily formed.

[0013] Further, in the case where the outer die roll includes a convex portion that is the flat surface forming portion and a groove portion that is the inclined surface forming portion, at least one of the convex portion and the groove portion is formed on the outer periphery. It is preferable that the outer mold roll is formed by stacking a plurality of disc-shaped mold blocks integrally in the same direction. Thus, the outer die roll is formed according to the height of the can body (depending on the number of recesses of the inner die roll).
By adjusting the number of stacked die blocks, it is possible to easily increase or decrease the number of steps of the convex portion, and to quickly respond to a change in the shape of the can body for forming the flat surface.
Furthermore, when a part of the outer roll has abrasion or damage, the outer roll can be easily maintained because the mold block can be replaced.

[0014]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing a can body of the present embodiment,
FIG. 2 is a sectional view taken along line II-II of FIG. 1, FIG. 3 is an explanatory view showing an inner roll and an outer roll, FIG. 4 is an explanatory view showing a process of forming a flat surface on a can body, and FIG. It is a side view which shows a partly broken outer roll.

The can body 1 of the present embodiment is generally called a three-piece can. As shown in FIG. 1, a can body 2 having a cylindrical shape is wound around an upper edge of the can body 2. The can 2 comprises a canopy 3 that closes the upper part of the can 2 so that it can be opened, and a bottom lid 4 that is wound around the lower edge of the can 2 to close the lower part of the can 2.

As shown in FIG. 1, the can body 2 has
A plurality of rectangular flat surfaces 5 arranged in the circumferential direction and the axial direction are formed. The flat surfaces 5 arranged in the circumferential direction of the can body 2 are connected to each other via a boundary ridge line 6, and form a polygonal shape when the can body 2 is viewed in a cross-sectional view as shown in FIG.

As shown in FIG. 1, the flat surfaces 5 adjacent to each other in the axial direction of the can body 2, that is, the upper flat surface 5 and the lower flat surface 5 adjacent thereto have a predetermined interval. Thus, they are arranged so as to be shifted from each other in the circumferential direction by half the width of the flat surface 5.

Further, between the upper and lower flat surfaces 5, the lower end of the upper boundary ridge line 6 is connected to the upper ends of a pair of boundary ridge lines 6 on both sides of the lower flat surface 5 located immediately below the boundary ridge line 6. A pair of connecting ridge lines 7 are formed. Then, a triangular inclined surface 8 inclined from the pair of adjacent connection ridges 7 toward the lower edge of the upper flat surface 5 and the upper edge of the lower flat surface 5 from the pair of adjacent connection ridges 7 are formed. Triangular inclined surfaces 9 that are inclined toward each other are formed alternately in the circumferential direction. Thus, the rectangular flat surface 5 and the upper and lower triangular inclined surfaces 8 and 9 form a hexagonal pattern 10 apparently divided by the boundary ridge 6 and the connection ridge 7. Each pattern 10 is arranged in a honeycomb shape. Reference numeral 11 denotes a neck-in portion that gradually reduces the diameter of the upper end of the can body 2.

As a result, in the can body 1, the deformation strength of the can body 2 is improved by the patterns 10 arranged in a honeycomb shape. Furthermore, since each pattern 10 is mainly constituted by the flat surface 5, The print (not shown) applied to the outer surface of the second 2 has a small distortion, makes it easy to see the print, and can improve the appearance.

Next, a method for manufacturing the can 1 will be described.
When forming the flat surface 5 and the inclined surfaces 8 and 9 on the can body 2, an inner roll 12 and an outer roll 13 shown in FIG. 3 are used.

As shown in FIG. 3, the inner die roll 12 is formed in a cylindrical shape having a diameter smaller than the diameter of the can body 2, and has a plurality of hexagonal concave portions 14 arranged in a honeycomb shape all around the outer surface. Have. The concave portion 14 has a contour that protrudes relatively to the concave portion 14, and a portion of the contour corresponding to the boundary ridge line 6 of each pattern 10 of the can body 2 (a portion extending in the axial direction of the can body 2). Is a boundary ridge forming protrusion 15, and a portion corresponding to the connection ridge 7 (a portion inclined with respect to the axis of the can body 2) is a connection ridge forming protrusion 16. The inner die roll 12 is provided on a turntable 17 on which the can body 2 is placed with a rotating means (not shown). A connection portion 18 is formed on the top of the inner die roll 12, and the connection portion 18 rotates in synchronization with the turntable 17 and can be raised and lowered to press the can body 2 on the turntable 17 from above. To the holding plate 19. The presser plate 19 is moved up and down by a not-shown elevating means, and the can body 2 is placed on the turntable 17 when it is at the ascending position. The can body 2 at this time still has the neck-in portion 11
Are not formed, and the canopy 3 and the bottom lid 4 are cylindrical without being wound. When the can body 2 is placed on the turntable 17, the inner roll 12 is inserted into the can body 2.

In the present embodiment, the can body 2 is for 350 g of content beverage, and 12 cans are provided on the can body 2 in the circumferential direction.
In order to form the hexagonal pattern 10 in four rows in the axial direction, the inner roll 12 is provided with eight recesses 14 in the circumferential direction and four rows in the axial direction.

As shown in FIG. 3, the outer die roll 13 is formed in a cylindrical shape having a diameter larger than the diameter of the can body 2, and the outer die roll 13 is formed between adjacent boundary ridge forming protrusions 15 of the inner die roll 12. Corresponding to the concave portion 14 described above, a plurality of convex portions 20 that are pressed against the can body 2 from outside are provided on the entire outer surface. Outer die roll 13
As shown in FIGS. 4A and 4B, the convex portion 20 has a flat surface forming portion 21 which is curved in the circumferential direction of the outer die roll 13, and the flat surface forming portion 21 is attached to the can body 2. The flat surface 5 is formed on the can body 2 by being pressed. A concave portion 22 is formed between the convex portions 20 adjacent to each other in the circumferential direction, and the concave portion 22 corresponds to the boundary ridge forming convex portion 15 of the inner die roll 12.

Further, as shown in FIG.
A groove 23 extending over the entire circumference of the outer die roll 13 is formed between the protrusions 20 adjacent to each other above and below 3. The groove 23
Corresponds to the inclined surfaces 8 and 9 of the can body 2 and forms a space into which the connecting ridge forming protrusion 16 of the inner die roll 12 can be pushed.

Further, the outer roll 13 is provided with
It is formed by stacking a plurality of disk-shaped mold blocks 24 each having a row and a groove 23 in the axial direction. Each mold block 24 has a through hole 2 penetrating vertically.
5 are formed, and are integrally formed by inserting a connecting rod 26 into the through hole 25. The outer die roll 13 can be divided into a plurality of die blocks 24 by extracting the connecting rod 26. This allows
The outer die roll 13 can easily correspond the number of stacked die blocks 24 according to the number of rows of the flat surface 5 formed on the can body 2 in the axial direction. Further, when a part of the convex portion 20 of the outer roll 13 is worn or damaged,
Since the replacement can be performed in units of the mold blocks 24, the maintenance of the outer mold roll 13 can be easily performed.

The outer roll 13 is rotated by a rotating means (not shown) via a rotary shaft 27.
And can be moved forward and backward toward the can body 2 placed on the turntable 17. When the outer die roll 13 is located at an interval from the can body 2 placed on the turntable 17, the can body 2 is placed on the turntable 17 and advance / retreat means (not shown) The outer die roll 13 is connected to the turntable 17
Is pressed into contact with the outside of the can body 2 placed on the outside.

As described above, the can body 2 of this embodiment is for 350 g of a content beverage, and has a hexagonal pattern 10 of 12 rows in the circumferential direction and 4 rows in the axial direction. For this purpose, the outer die roll 13 is provided with 24 rows of projections 20 in the circumferential direction and four rows in the axial direction.

As shown in FIG. 3, the outer roll 13 is pressed against the can body 2 placed on the turntable 17 so that the inner roll 12 and the outer roll 13 can be held between the inner roll 12 and the outer roll 13. The cylinder 2 is sandwiched and rotated while being pressed against both rolls 12 and 13, thereby forming a hexagonal pattern 10 including the flat surface 5 and the inclined surfaces 8 and 9 on the entire circumference of the can 2. . At this time, the flat surface 5 is
As shown in (a), the convex portion 20 of the outer die roll 13 is formed by being pressed into the concave portion 14 of the inner die roll 12.
The flat surface forming portion 21 of the convex portion 20 of the outer die roll 13 is curved, and the circumferential surface of the can body 2 can be formed into a flat shape by pressing while rotating. Then, as the two rolls 12 and 13 rotate, the boundary ridge forming protrusion 15 of the inner die roll 12 is pushed into the concave portion 22 between the protrusions 20 of the outer die roll 13, as shown in FIG. The body 2 can be formed in a polygonal shape.

The inclined surfaces 8 and 9 are formed on the outer roll 1.
When the three convex portions 20 are pushed between the boundary ridge forming convex portions 15 on both sides of the concave portion 14 of the inner die roll 12, they are simultaneously connected to the groove portions 23 of the outer die roll 13 and the boundary ridge forming convex portions 15. When the connecting ridge forming protrusion 16 is pushed in, and the flat surface 5 is formed, the inclined surfaces 8 and 9 connected to the flat surface 5 are formed.

As described above, the hexagonal pattern 10 composed of the flat surface 5 and the inclined surfaces 8 and 9 is formed on the entire circumference of the can body 2 by the rotation of the can body 2 by pressing and rotating by the outer roll 13 and the inner roll. It can be easily formed into a honeycomb shape. Moreover, even if a plurality of flat surfaces 5 are formed on the entire circumference of the can body 2,
The inclined surfaces 8 and 9 are formed between the flat surfaces 5 adjacent to each other in the axial direction, so that the molding amount can be reduced, and the coating applied to the inner surface of the can body 2 can be prevented from being damaged.

In this embodiment, the outer roll 13 is used.
Is provided with a convex portion 20 for forming the flat surface 5 on the can body 2 and a groove portion 23 corresponding to the forming position of the inclined surfaces 8 and 9.
As shown in (1), an outer roll 29 having a plurality of hexagonal convex portions 28 corresponding to the concave portions 14 of the inner roll 12 on the entire circumference may be employed. As shown in FIG. 5, the outer roll 29 includes hexagonal projections 28 arranged in a honeycomb shape. The convex portion 28 includes a flat surface forming portion 30 that curves in the circumferential direction, and a pair of inclined surface forming portions 31 that are continuous from upper and lower edges of the flat surface forming portion 30. Thereby, when the flat surface forming portion 30 of the outer die roll 29 is pressed between the boundary ridge forming protrusions 15 of the inner die roll 12 (FIG. 4).
In this case, the inclined surface forming portion 31 is pushed into between the connecting ridge forming convex portions 16 of the inner die roll 12 so that the flat surface 5 and the inclined surfaces 8 and 9 can be easily formed on the can body 2.

In the outer die roll 29 shown in FIG. 5, although not shown, for example, a disk-shaped die block having a row of convex portions 28 on the entire circumference is formed by being integrally stacked in the axial direction. Can be. Thus, similarly to the above-described embodiment, the number of rows of the convex portions 28 in the axial direction can be easily increased / decreased or replaced in each mold block.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a can of one embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is an explanatory view showing an inner roll and an outer roll.

FIG. 4 is an explanatory view showing a step of forming a flat surface on a can body.

FIG. 5 is a side view showing another outer roll.

FIG. 6 is a front view showing a conventional can body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Can body, 2 ... Can body, 5 ... Flat surface, 6 ... Boundary ridgeline, 7 ...
Connecting ridge line, 8, 9 ... inclined surface, 12 ... inner roll, 13,
29: outer roll, 14: concave, 20, 28: convex, 2
1, 30: flat surface forming portion, 23, 31: inclined surface forming portion,
23: groove, 24: mold block.

Claims (5)

[Claims] 1. A plurality of identical rectangular flat surfaces are formed in a circumferential direction and an axial direction of a can body, and the flat surfaces adjacent in a circumferential direction are arranged continuously with each other via a boundary ridge line. Thereby, a polygonal shape is formed when the can body is viewed in cross section, and the flat surfaces adjacent to each other in the can axis direction are arranged at predetermined intervals from each other in a circumferential direction, and are arranged in the can axis direction. At a position between the adjacent flat surfaces, a pair of connecting ridge lines connecting the lower end of the upper boundary ridge line and the upper ends of the pair of boundary ridge lines on both sides of the lower flat surface located immediately below the boundary ridge line are formed. , A triangular inclined surface inclined from a pair of adjacent connection ridges toward the lower edge of the upper flat surface,
A can body characterized in that triangular inclined surfaces inclined from a pair of adjacent connection ridges toward an upper edge of a lower flat surface are alternately formed in a circumferential direction. 2. A plurality of identical rectangular flat surfaces are formed in the circumferential direction and the axial direction of the can body, and the flat surfaces adjacent in the circumferential direction are arranged continuously with each other via a boundary ridge line. Thereby, a polygonal shape is formed when the can body is viewed in cross section, and the flat surfaces adjacent to each other in the can axis direction are arranged so as to be displaced in the circumferential direction at a predetermined interval from each other, and in the can axis direction. At a position between the adjacent flat surfaces, a pair of connecting ridge lines connecting the lower end of the upper boundary ridge line and the upper ends of the pair of boundary ridge lines on both sides of the lower flat surface located immediately below the boundary ridge line are formed. , A triangle-shaped inclined surface inclined from a pair of adjacent connection ridges toward a lower edge of an upper flat surface, and a triangle-shaped inclined from a pair of adjacent connection ridges toward an upper edge of a lower flat surface. A can body in which inclined surfaces are alternately formed in the circumferential direction. A cylindrical inner roll in which a plurality of hexagonal recesses are formed in a honeycomb shape on the entire outer surface is inserted axially into a cylindrical can body, corresponding to the recesses of the inner roll, Further, an outer die roll having a flat surface forming portion curved in the circumferential direction for forming the flat surface, and an inclined surface forming portion for forming the inclined surface formed on the entire outer surface is provided on an outer surface thereof through a can body. A method for manufacturing a can body, comprising pressing the inner die roll from the side and rotating both rolls to form the flat surface and the inclined surface on the entire circumference of the can body. 3. The outer roll has a plurality of convex portions formed in a hexagonal shape in a side view from the flat surface forming portion and the inclined surface forming portion corresponding to the concave portions of the inner die roll. 3. The method for producing a can body according to claim 2, wherein the can bodies are formed in a row. 4. The flat surface forming portion of the outer die roll is a plurality of convex portions having a substantially square shape in a side view, and the inclined surface forming portion of the outer die roll corresponds to a forming position of the inclined portion. 3. The method for manufacturing a can body according to claim 2, wherein the groove is formed as a concave. 5. The outer roll is formed by integrally stacking a plurality of disk-shaped mold blocks each having at least one of the convex portion and the groove portion on the outer periphery in the same direction. The method for producing a can according to claim 4.