JP5381907B2 - Can body - Google Patents

Description

  The present invention relates to a can body, and more specifically, includes a can body formed along a cylindrical reference surface, and a pair of lid portions for closing openings on one side and the other side along the axis of the can body. Related to the can body.

Conventionally, beverage cans, food cans, and the like have been widely used as cans, and such cans can be used for the pressure applied during the cooling process after filling and sterilizing the contents, and the load applied during transportation and display. Designed and manufactured to ensure strength characteristics such as paneling strength and rheometer strength. On the other hand, in recent years, due to increasing demands for weight reduction and resource saving, there is an increasing need to reduce the thickness of the can body while ensuring strength characteristics. Various shapes of cans having unevenness have been proposed (see, for example, Patent Documents 1 to 4).
As a representative example of Patent Documents 1 to 4, the can body described in Patent Document 1 includes a structural unit surface that is a polygon such as a triangle, and boundary ridgelines and boundary ridgelines that contact these structural unit surfaces. It has a circumferential polyhedral wall formed by intersecting intersections. The can body having such a circumferential polyhedral wall is formed such that the boundary ridge line and the crossing portion protrude from the structural unit surface to the outside of the can, and the structural unit surfaces are arranged based on an appropriate mathematical formula. Thus, it is intended to reduce the thickness of the can body while ensuring the strength characteristics of the can body.

Japanese Patent Publication No. 7-5127 Japanese Patent Publication No. 6-78096 JP-A-10-328772 JP 2007-69973 A

  However, in the can body described in Patent Document 1, since the structural unit surface is inclined with respect to the cylindrical reference surface of the can body, the printed surface applied to the outer surface of the can body is difficult to see at the time of appearance. There are challenges. On the other hand, as in the cans described in Patent Documents 2 to 4, when the structural unit surface and the unmolded portion are provided as a flat surface along the cylindrical reference surface of the can body, the appearance of the printing surface is ensured. However, since the flat surface is continuously formed, the can body is easily deformed, and various strength characteristics such as paneling strength and rheometer strength cannot be sufficiently improved, and the can body is sufficiently thinned. I can't plan. As described above, the conventional can body has a problem that the can body cannot be thinned and lightened by increasing various strength characteristics while ensuring the appearance of the printing surface.

  The object of the present invention is to devise the shape and arrangement of irregularities, and while ensuring the appearance of the printing surface, it is possible to reduce the weight of the can body by reliably reducing the weight of the can body by improving various strength characteristics. It is to provide a can body.

  The can body of the present invention is a can body including a can body formed along a cylindrical reference surface, and a pair of lid portions that closes the openings on one side and the other side of the can body, The can body has a plurality of convex portions protruding outward from the reference surface and a plurality of concave portions recessed inward from the reference surface, and each of the convex portions and the concave portions is a surface along the reference surface. The shape and dimensions in the inward direction are substantially the same, and the projecting dimension and the immersion dimension from the reference surface are substantially the same, the convex portion has a convex flat surface along the reference surface, and the concave portion The convex portion and the concave portion are arranged adjacent to each other along both the first direction and the second direction intersecting each other in the reference plane. In addition, the inclination inclined with respect to the reference surface in the convex portion and the concave portion adjacent to each other. Wherein the convex portion through the surface flat surface and the recess planar surfaces and are connected.

  In the present invention, the cylindrical reference surface that defines the cross-sectional shape of the can body is not limited to a cylindrical surface, and may be an elliptical cylindrical surface, a long cylindrical surface, a rectangular cylindrical surface, or the like, or an appropriate closure. It may be a surface along the mold free curve. Further, the cylindrical reference surface may be one in which the same shape is continuous in the axial direction, the diameter of the cylindrical reference surface may be changed, or a free curved surface may be drawn along the axial direction. . In addition, the can body may be formed by forming a flat plate or the like having a predetermined plate thickness into a cylindrical shape, and then forming a convex portion or a concave portion, or by integrally forming a cylindrical shape including the convex portion or the concave portion. But you can.

  According to the present invention described above, the convex portions and the concave portions are alternately arranged adjacent to each other, and the convex portions are connected to each other through the inclined surfaces. In addition, a flat surface along the reference surface is not continuously formed around the concave portion and the concave portion, and since the convex flat surfaces and the concave flat surfaces are not adjacent to each other, a continuous flat surface is formed. Not. By preventing the formation of such a continuous flat surface, the convex and concave portions act geometrically against the external force (external force or internal pressure) acting on the can body. Because the solid effect increases the rigidity of the can body and makes it difficult to deform, strength characteristics such as paneling strength and rheometer strength can be improved. In addition, since the flat surface along the reference surface of the cylindrical can body is formed, the plate thickness of the can body is reduced while ensuring the appearance of the printing surface applied to the outer surface of the can body, It is possible to reduce the weight of the can body and save resources. The convex portion and the concave portion have substantially the same shape and size in the in-plane direction along the reference surface, and the protrusion size and the immersion size with respect to the reference surface are substantially the same, so that the vicinity of the reference surface is obtained. The neutral shaft can be positioned, and the strength characteristics with respect to the external force of the can body can be improved efficiently.

At this time, in the can body of the present invention, a configuration in which the first direction is provided in parallel with the axis of the can body and the second direction is provided in parallel with the circumferential direction of the can body can be employed. .
Further, in the can body of the present invention, the first direction and the second direction are provided in spiral shapes opposite to each other around the axis of the can body, and the first direction with respect to the circumferential direction of the can body The second direction may be provided at the same crossing angle.
According to each of such configurations, the angle between the first and second directions in which the convex portion and the concave portion are arranged in parallel according to the external force acting on the can body and the axial direction of the can body is appropriately set. Thus, the balance of each strength characteristic such as the paneling strength, the rheometer strength, the axial compression strength, and the like can be adjusted, and the can can be efficiently designed for the required performance to further promote the thinning.

In the can body of the present invention, it is preferable that the convex flat surface and the concave flat surface have a substantially square front shape perpendicular to the reference surface.
According to such a configuration, by forming the flat surface of the convex portion and the flat surface of the concave portion in a substantially square shape, the anisotropy of the convex portion and the concave portion is eliminated with respect to two orthogonal axes along the circumferential surface of the can body. It is possible to suppress unevenness of stress transmitted in the in-plane direction by an external force.

Further, in the can body of the present invention, an intersection flat surface along the reference plane is formed at the same diameter position as the reference plane at the intersection where the two convex portions and the two concave portions gather. It is preferable.
According to such a configuration, if an intersecting portion flat surface is formed at an intersecting portion where two protrusions and recesses are gathered, the projecting portion protrudes from the recessed portion or projects from the recessed portion via the intersecting portion flat surface. By transmitting the force to the part, compared to the case where the corners of the convex part and the concave part are directly connected to each other, stress concentration can be relaxed, and damage to the can body at the intersection can be prevented. it can.

At this time, in the can body of the present invention, it is preferable that each of the convex flat surface and the concave flat surface is formed in an octagon in which a front shape orthogonal to the reference surface is formed by cutting four corners of a substantially square shape.
According to such a configuration, when the intersection flat surface is formed, the convex flat surface and the concave flat surface are formed into octagons by cutting off the corners of the intersection flat surface, thereby flattening the convex portions. The stress transmission between the flat surface of the surface and the concave portion and the flat surface of the intersecting portion or the inclined surface can be made smoother, and the strength characteristics can be further improved by suppressing the stress concentration.

  According to the can body of the present invention as described above, the convex portions and the concave portions are alternately arranged adjacent to each other, and the convex portion flat surface and the concave portion flat surface are connected via the inclined surface. Therefore, the convex part and the concave part act geometrically against the external force acting on the can body, and the solid effect of the can body increases the rigidity of the can body and suppresses deformation, thereby improving the strength characteristics such as paneling strength and rheometer strength. Can be improved. In addition, since a flat surface is formed along the reference surface of the cylindrical can body, it is possible to reduce the weight by reducing the thickness of the can body while ensuring the appearance of the printing surface applied to the outer surface of the can body. Resource saving can be realized. Moreover, the grip property of a can body improves by setting it as the shape by which a convex part and a recessed part are alternately arrange | positioned adjacently, Furthermore, the tolerance with respect to a dent can also be improved.

It is a perspective view which shows the can which concerns on embodiment of this invention. It is sectional drawing of the can body in the said can body. It is a perspective view which expands and shows a part of can body of a 1st form. It is a perspective view which expands and shows a part of can body of a 2nd form. It is sectional drawing which shows the can body of a 1st form and a 2nd form. It is a perspective view which shows the can which concerns on the modification of this invention. It is a figure which shows the analysis model of the Example of this invention. It is a figure which shows the analysis model of the conventional cylindrical can. It is a graph which shows an analysis result.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 and 2, a can body 1 according to the present embodiment is used for a beverage can, a food can, and the like, and is a can body formed along a cylindrical reference plane F (see FIG. 2). 2, a canopy 3 as a lid for closing the opening on one side (upper side in FIG. 1) of the can body 2, and a bottom as a lid for closing the opening on the other side (lower side in FIG. 1) of the can body 2 And a lid 4. The can body 1 is configured by combining a can body 2, a canopy 3 and a bottom lid 4 formed by pressing or the like from a metal thin plate such as steel (various surface-treated steel plates), stainless steel, aluminum alloy or the like.

  The can body 2 has a plurality of protrusions protruding from the reference surface F to the outside of the can 1 over substantially the entire length in the axial direction (the vertical direction in FIG. 1 and the direction along the central axis of the cylindrical reference surface F). , And a plurality of recesses 6 immersing from the reference surface F to the inside of the can body 1. In addition, the convex part 5 and the recessed part 6 are not formed in the upper end part of the can body 2 connected to the canopy 3 and the lower end part of the can body 2 connected to the bottom cover 4. The cylindrical shape is substantially coincident. The convex portion 5 and the concave portion 6 have substantially the same shape and size in the in-plane direction along the reference surface F, respectively, and the protruding size and the immersion size from the reference surface F are substantially the same. Moreover, the convex part 5 and the recessed part 6 in this embodiment are the 1st direction along the axial direction (X direction of a figure) of the can body 2, and the 1st direction along the circumferential direction (theta direction of a figure) of the can body 2. FIG. The two convex portions 5 and the concave portions 6 are alternately arranged along two directions, and the adjacent convex portions 5 and concave portions 6 are connected to each other via an inclined surface 7 that is inclined to the reference plane F.

  The can body 2A of the first embodiment shown in FIGS. 3 and 5A includes a plurality of convex portions 5A protruding from the reference surface F to one side (upward in the drawing and outside the can body 1), and a reference surface A plurality of recesses 6A that are recessed from F to the other side (the lower side of the figure and the inside of the can 1) are formed. The convex portion 5A is formed in a regular quadrangular truncated pyramid shape having a convex flat surface 51A having a substantially square shape along the peripheral surface of the can body 2, and the concave portion 6A is a plane along the peripheral surface of the can body 2. It is formed in a regular quadrangular truncated pyramid shape having a concave flat surface 61A having a substantially square shape. And in the convex part 5A and the recessed part 6A which adjoin each other, the mutually adjacent sides of the convex part flat surface 51A and the concave part flat surface 61A are connected by the inclined surface 7A. In such a can body 2A, each protrusion 5A is surrounded by four recesses 6A, and each recess 6A is surrounded by four protrusions 5A. The convex portions 5A and the plurality of concave portions 6A are arranged in a checkered pattern (checker shape) alternately arranged along two in-plane orthogonal directions (X and θ directions) of the reference plane F, and adjacent convex portions 5A are not mutually connected, and adjacent recessed part 6A is not mutually continued.

  A can body 2B of the second form shown in FIGS. 4 and 5B includes a plurality of convex portions 5B protruding from the reference surface F to one side (above the drawing and outside the can body 1), and a reference surface Project from the reference surface F at the intersection where the plurality of recesses 6B recessed from F to the other side (the lower side of the figure and the inside of the can 1), the two projections 5B, and the two recesses 6B gather. The crossing flat surface 8 remains without being recessed. The convex portion 5B is formed in an octagonal truncated pyramid shape having an octagonal convex flat surface 51B in which the planar shape along the peripheral surface of the can body 2 is substantially square, and the concave portion 6B is formed in the can body. The planar shape along the circumferential surface 2 is formed in an octagonal truncated pyramid shape having an octagonal concave flat surface 61B obtained by cutting four corners of a substantially square shape. And in the convex part 5B and the recessed part 6B which adjoin each other, the mutually adjacent sides of the convex part flat surface 51B and the recessed part flat surface 61B are connected by the inclined surface 7B. Further, in the convex portion 5B and the concave portion 6B that are diagonally adjacent to each other with the intersecting portion flat surface 8 interposed therebetween, the corner-cut side of the projecting portion flat surface 51B and the side of the intersecting portion flat surface 8 define the intersecting inclined surface 81. The side of the recess flat surface 61B that is cut off at a corner and the side of the crossing flat surface 8 are connected via a crossing inclined surface 82.

  In the can body 2B of the second form as described above, each convex portion 5B is substantially surrounded by four concave portions 6B, and each concave portion 6B is surrounded by four convex portions 5B. In other words, the plurality of convex portions 5B and the plurality of concave portions 6B are arranged in a checkered pattern (checkered) alternately arranged along two in-plane orthogonal directions (X, θ directions) of the reference plane F. The adjacent convex portions 5B are not continuous with each other, and the adjacent concave portions 6B are not continuous with each other. Further, the intersecting portion flat surface 8 is surrounded by the two convex portions 5B and the two recessed portions 6B, so that the adjacent intersecting portion flat surfaces 8 are not continuous with each other. Furthermore, the inclined surface 7B that connects the convex portion 5B and the concave portion 6B is connected to the cross-inclined surface 81 or the cross-inclined surface 82 at both ends, so that the adjacent inclined surfaces 7B do not continue to each other. Yes.

  In the present embodiment, as shown in FIGS. 1 to 5, not only the can 1 in which the convex portions 5 and the concave portions 6 are alternately arranged along the X direction and the θ direction, As in the can body 1A shown in FIG. 6, the first direction and the second direction in which the convex portions 5 and the concave portions 6 are arranged side by side are opposite to each other around the axial direction (X direction in the figure) of the can body 2 respectively. And may be provided at the same crossing angle (for example, 45 °) with respect to the circumferential direction (θ direction in the figure) of the can body 2. Also in such a can 1A, each convex part 5 is surrounded by four concave parts 6, and each concave part 6 is configured by four convex parts 5 around the circumference. The plurality of convex portions 5 and the plurality of concave portions 6 are in a checkered pattern (checkered) alternately arranged along two in-plane orthogonal directions of the reference plane F (directions crossing the X direction and the θ direction, respectively). It arrange | positions and the adjacent convex parts 5 are not mutually connected, and the adjacent recessed parts 6 are not mutually continued.

According to the above embodiment, the following effects can be obtained.
That is, since the convex portions 5 and the concave portions 6 are arranged in an alternating checkered pattern, the convex portions 5 and the concave portions 6 act geometrically on the external force acting on the can body 2 and the three-dimensional effect can The rigidity of the body 2 is increased and deformation can be suppressed to improve strength characteristics such as paneling strength and rheometer strength. In addition, since the convex flat surface 51A (51B) of the convex portion 5 and the concave flat surface 61A (61B) of the concave portion 6 along the reference surface F of the cylindrical can body 2 are formed, While ensuring the appearance of the printed surface applied to the surface, the can body 2 can be made thinner to reduce the weight of the cans 1 and 1A and save resources. The convex portion 5 and the concave portion 6 have substantially the same shape and size in the in-plane direction along the reference plane F, and the protruding dimension and the immersion dimension with respect to the reference plane F are substantially the same. The neutral shaft can be positioned in the vicinity of the surface F, and the strength characteristics with respect to the external force of the can bodies 1 and 1A can be improved efficiently.

Hereinafter, the results of studying the strength characteristics (paneling strength, rheometer strength) of the can of the present invention will be described.
FIG. 7 (A) shows an FEM analysis model of a can body according to an embodiment of the present invention. In this embodiment, the diameter φ52 mm, the can height 104 mm (the can body portion excluding the winding portion is 96 mm) can body was divided into 26 in the circumferential direction against a can body using a steel plate having a sheet thickness t = 0.150 mm, a material yield point σy = 450 N / mm ² and a Young's modulus E = 205000 N / mm ^2. A convex portion having a height of 0.5 mm and a concave portion having a depth of 0.5 mm are provided. As for paneling strength, an equally distributed pressure is applied from the outer surface of the can, and as for the rheometer strength, as shown in FIG. 7B, a tip bar for can barrel pressing (a round bar having a length of 40 mm and a diameter of 10 mm). The finite element analysis was performed under the condition that pressure was applied to the can body with a rod. FIG. 8 shows an FEM analysis model of a conventional cylindrical can as a comparative example. In this comparative example, the can body of the cylindrical can is set to t = 0.175 mm and t = 0.150 mm (others). The value was the same as that of the can body of the example).
FIG. 9 shows a graph of the analysis results, FIG. 9A is a graph showing the ratio of paneling intensity, and FIG. 9B is a graph showing the ratio of rheometer intensity. In the can body of the example, even if the plate thickness t = 0.150 mm of the can body is reduced, the proof strength (paneling strength, rheometer strength) is equal to or greater than the plate thickness t = 0.175 mm of the conventional cylindrical can. It can be seen that sufficient strength characteristics can be exhibited while reducing the weight of the can. It can be seen that the paneling strength and the rheometer strength are reduced by about 30% by simply thinning the cylindrical can.

In addition, this invention is not limited to the said embodiment, Including other structures etc. which can achieve the objective of this invention, the deformation | transformation etc. which are shown below are also contained in this invention.
For example, in the above-described embodiment, the case where the reference surface F of the cans 1 and 1A is a cylindrical surface has been described. It may be any other three-dimensional curved surface. Further, the cans 1 and 1A are not limited to the three-piece can configured by combining the can body 2, the canopy 3 and the bottom lid 4 that are processed separately, but a two-piece can in which these parts are integrally formed. But you can.

Moreover, in the said embodiment, the case where it follows along two directions of the axial direction (X direction) of the can body 2, and the circumferential direction ((theta) direction) of the can body 2 as the juxtaposition direction of the convex part 5 and the recessed part 6; Although the case where each of the two directions of the axial direction (X direction) of the barrel 2 and the circumferential direction (θ direction) of the can barrel 2 intersects at 45 ° has been described, the present invention is not limited to this, The juxtaposition direction can be set in any two directions.
Moreover, the width | variety which provides the convex part 5 and the recessed part 6 in the axial direction of the can body 2 may be provided in the can body full length, may be concentrated and provided in the center vicinity of the axial direction length of the can body, request | requirement What is necessary is just to set according to the intensity | strength characteristic and external appearance property.
Moreover, what is necessary is just to set the bending R of the board at the time of forming an uneven | corrugated | grooved part suitably according to the moldability of the raw material which comprises a can body.
Moreover, in the said embodiment, although the convex part 5 and the recessed part 6 illustrated what each formed in the planar rectangular shape, a convex part and a recessed part have polygonal planar shapes, such as a triangle and a hexagon. It may be formed.

In addition, the best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this. That is, the invention has been illustrated and described with particular reference to certain specific embodiments, but without departing from the spirit and scope of the invention, Various modifications can be made by those skilled in the art in terms of material, quantity, and other detailed configurations.
Therefore, the description limiting the shape, material, etc. disclosed above is an example for easy understanding of the present invention, and does not limit the present invention. The description by the name of the member which remove | excluded the limitation of one part or all of such restrictions is included in this invention.

  DESCRIPTION OF SYMBOLS 1,1A ... Can body, 2, 2A, 2B ... Can trunk, 3 ... Canopy (lid part), 4 ... Bottom lid (lid part), 5, 5A, 5B ... Convex part, 6, 6A, 6B ... Concave part, 7, 7A, 7B ... inclined surface, 8 ... crossing flat surface, 51A, 51B ... convex flat surface, 61A, 61B ... concave flat surface, F ... reference surface.

Claims (6)

A can body comprising a can body formed along a cylindrical reference surface, and a pair of lid portions for closing the openings on one side and the other side of the can body,
The can body has a plurality of convex portions protruding outward from the reference surface and a plurality of concave portions recessed inward from the reference surface, and each of the convex portions and the concave portions is along the reference surface. The shape and dimension in the in-plane direction are substantially the same, and the protruding dimension and the immersion dimension from the reference surface are substantially the same, the convex part has a convex flat surface along the reference surface, and the concave part is Formed with a concave flat surface along the reference surface,
The convex portions and the concave portions are alternately arranged along both directions of the first direction and the second direction intersecting with each other in the reference plane, and the reference plane is adjacent to the convex portions and the concave portions adjacent to each other. The can body, wherein the convex flat surface and the concave flat surface are connected via an inclined inclined surface. In the can according to claim 1,
The can body characterized in that the first direction is provided in parallel with an axis of the can body, and the second direction is provided in parallel with a circumferential direction of the can body. In the can according to claim 1,
The first direction and the second direction are provided in spirals opposite to each other around the axis of the can body, and the first and second directions have the same crossing angle with respect to the circumferential direction of the can body A can body characterized by being provided with. In the can body according to any one of claims 1 to 3,
Each of the convex flat surface and the concave flat surface has a front shape that is orthogonal to the reference surface and is formed in a substantially square shape. In the can body according to any one of claims 1 to 3,
A can body characterized in that an intersection flat surface along the reference plane is formed at the same diameter position as the reference plane at the intersection where the two convex portions and the two concave portions gather. . In the can according to claim 5,
The can flat body is characterized in that each of the convex flat surface and the concave flat surface has an octagonal shape in which a front shape perpendicular to the reference surface is cut off from four corners of a substantially square shape.

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