JP2008007202A - Metal can having stereoscopic display and embossing method - Google Patents

Abstract

[PROBLEMS] To form a three-dimensional display part that looks convex with excellent visibility on the outer peripheral surface of a metal can such as an aluminum can for beverages, but the convex display part is actually formed from the outer peripheral surface of the can body. It does not protrude and does not cause clogging or deformation due to mutual interference when the can is transferred.
In a state in which the top surface 10b of the display unit 10 is positioned in the same plane as the reference outer peripheral surface of the can body 2, a groove-shaped recess 11 is formed outside the contour line 10a. The groove-shaped concave portion 11 has a bottom wall surface 11b formed in an inclined surface with a gentle slope toward the outside, and an outer edge formed by smoothly continuing to the outer peripheral surface of the can body 2 via an arc-shaped connecting wall surface portion 11c. It shall be inconspicuous in appearance.
[Selection] Figure 2

Description

  The present invention mainly relates to a metal can such as an aluminum can for beverages, and in particular, a metal can having a three-dimensional display portion that is convexly formed by embossing a display portion such as a trademark or content display on the peripheral wall of the can body and the display portion The present invention relates to an embossing method for shaping.

  As cans for beverages such as beer and soft drinks, metal cans such as aluminum cans and steel cans formed by drawing and ironing processes called DI cans are often used.

  These metal cans are printed with patterns, characters, symbols, etc. on the outer surface of the can body in order to improve the appearance design and display the type and characteristics of the trademark and contents. This is usually done by

  In recent years, with regard to such metal cans, in order to further individualize and differentiate and to improve the appeal effect, embossing in a manner in which a part of various display parts by printing, for example, the display part of a trademark, is aligned with the printed display. Metal cans that appear in a convex or concave shape by processing to express a three-dimensional appearance have appeared.

An example of a metal can having a convex or concave three-dimensional display portion by such embossing can be found in Patent Document 1 below, for example.
JP 2003-340539 A

  The most common form of a metal can that represents such a three-dimensional display part by embossing projects the display part for information consisting of characters, symbols, etc. outward from its reference outer peripheral surface on the peripheral wall of the can body. It is expressed as a convex shape.

  However, in such a metal can in which a convex display portion is formed on the outer peripheral surface of the trunk, the convex shape is formed when the can is transferred in the can making process or the filling / sealing process of the contents after the can making. The display unit may interfere with other adjacent metal cans, which may cause deformation of the cans, prevent smooth movement of the cans on the transfer path, and cause a so-called clogging phenomenon. There is a concern that there is a problem that there is.

  On the other hand, in order to avoid such inconvenience, the display portion is embossed into a concave shape, or a wide area portion of the peripheral area surrounding the display portion is embossed into a concave surface, and a convex shape is formed in the concave surface. In consideration of the formation of the display portion, it is partly implemented at present. However, in these cases, the visibility of the display part is slightly inferior compared to the case where a convex display part protruding in an independent form from the reference outer peripheral surface of the can body is used, and in terms of appeal effect. There was a difficulty that sufficient satisfaction could not be obtained.

  The present invention is based on the background as described above, and the display part appears on the outer peripheral surface of the can body in a convex shape on the outside, and the display part has excellent visibility and individuality with excellent appeal. It is an object of the present invention to provide a metal can having a convex display portion that has a negative appearance and does not cause a clogging phenomenon or deformation at the time of transfer as described above.

  Another object of the present invention is to provide an embossing method suitable for shaping such a convex display portion.

  The present invention presents the following configurations as means for solving the above technical problems.

[1] In a metal can provided with a display portion composed of characters, symbols, figures, etc. on the outer peripheral surface of the can body,
The display portion is formed with a groove-shaped recess having a predetermined width on the outer side along the outline of the display portion with the outer surface thereof being positioned in the same plane as the reference outer peripheral surface of the can body. , Formed with a substantially convex appearance,
The groove-shaped recess is formed from a steep descending side wall surface portion extending stepwise from one side edge of the display portion on the contour line side toward the inside of the can body, and a groove bottom portion at the lower end of the descending side wall surface portion. A gradually rising rising bottom wall surface extending in a slanting direction toward the reference outer peripheral surface of the can body, and an arc-shaped connecting wall surface smoothly extending from the outer side edge of the rising bottom wall surface portion to the reference outer peripheral surface of the can body A metal can having a three-dimensional display portion, wherein the outer edge of the groove-like recessed portion is formed in an erasing manner that is not conspicuous in appearance.

  [2] The metal can having the three-dimensional display portion according to the above item 1 in which the depth D is set in a range of 0.15 to 0.35 mm.

  [3] The metal can having the three-dimensional display part according to the above item 1 or 2, wherein the groove-shaped recess has a width W set to 5 ≦ W / D ≦ 100 with respect to the depth D.

[4] The descending side wall surface portion of the groove-shaped recess portion is any one of the above items 1 to 3, wherein an inclination angle θ ₁ with respect to the radial line of the can body is set in a range of 40 ° to 80 °. A metal can having a three-dimensional display.

[5] The rising bottom wall surface portion of the groove-like recess portion has the inclination angle θ ₂ with respect to a line connecting the upper edges on both sides of the groove-like recess portion set in the range of 0.5 ° to 10 °. Metal can which has the three-dimensional display part of any one of -4.

[6] An embossed inner mold roll inserted into the can body and an embossed outer roll disposed opposite the inner mold roll, and a metal can can between them. It is an embossing method for forming a convex display portion composed of letters, symbols, figures, etc. on the peripheral wall of the can barrel by rotating relative to the peripheral wall of the barrel,
The inner-type roll has a recessed surface portion that occupies an area larger than the display portion on the outer peripheral surface, and a display portion forming step shape in which the top surface is located in the same plane as the outer peripheral surface of the inner-type roll. While having a convex portion,
The outer roll is a built-up outer bulge having an area slightly larger than the formation area of the step-shaped convex portion for forming the display portion of the inner roll, and the inner roll in the outer bulge. And the top surface of the outwardly bulging portion in the outer region portion of the recessed portion is the outer peripheral surface of the outer roll. It is formed on an inclined surface inclined with a gentle gentle slope toward the
The convex part for forming the display part of the inner roll and the stepped concave part of the outer roll form the convex display part on the peripheral wall of the can body. A groove-shaped recess having an erasing aspect in which the outer edge is not noticeable in appearance is formed on the outer side along the contour line of the convex display portion with the outwardly bulging portion of the mold roll. Embossing method for metal cans.

  The metal can according to the item [1] according to the present invention has a groove-like recess formed on the outer side along the outline of the display portion of characters, symbols, etc. on the peripheral wall of the can body, and this groove-like recess. The outer edge of the can is smoothly formed on the reference outer peripheral surface of the can body and is formed in an erasure mode that does not stand out in appearance. In the form of a convex emboss that is located in the plane and does not protrude outward, but is externally raised from the outer peripheral surface of the can body in terms of the external relationship with the groove-shaped concave portion on the outside. Appears as

  Therefore, the display portion has a highly visible and visible appearance that has a convex appearance, and as a result, the metal can can be further improved in appealing power.

  Moreover, since the outer surface or the top surface of the convex display portion does not protrude from the reference outer peripheral surface of the can body, clogging phenomenon, blocking phenomenon or the like does not occur on the transfer path when the empty can is transferred. Moreover, there is no fear that the can is deformed due to the influence of external force due to mutual interference.

  In addition, as described in the above item [2], by setting the depth D of the groove-like recesses in the range of 0.15 to 0.35 mm, the display unit can be seen to rise up clearly in appearance. And can be surely highly visible.

  In addition, as described in the above item [3], by setting the width W of the groove-like recessed portion in a range of 5 ≦ W / D ≦ 100 with respect to the depth D, the display portion can be clearly seen in appearance. On the other hand, it will be visible to those that have a convex appearance protruding outward from the outer peripheral surface of the trunk, while the convex display part will not interfere with each other between adjacent cans when transferring empty cans it can. That is, when the width W is too small, the display portion is difficult to be seen in a raised shape, whereas when it is too wide, the top surface of the display portion is not projected from the reference outer peripheral surface of the can body. Depending on the relative relationship with the wide groove-like recess, the display unit may easily interfere with each other between adjacent cans when the empty can is transferred. On the other hand, by setting the width W in the range of 5 ≦ W / D ≦ 100, it is possible to reliably avoid the occurrence of the above problems.

Further, as described in the above item [4], by setting the inclination angle θ ₁ of the descending side wall surface portion of the groove-shaped recessed portion in the range of 40 ° to 80 °, the display portion is stepped along the contour line. It is possible to make it appear as a clear embossed aspect having an edge, and it is possible to prevent the embossing from causing breakage and weak points in the strength in the can body of the contour line portion.

Further, as described in the above item [5], by setting the inclination angle θ ₂ of the rising bottom wall surface portion of the groove-shaped recessed portion in the range of 0.5 ° to 10 °, the same as the item [3] described above. The effect can be achieved reliably.

  Further, the embossing of the convex display portion and the groove-shaped concave portion along the contour line thereof is performed using both the inner and outer mold rolls having a specific configuration as described in the above [6], The metal can having the convex display portion as described in the item 1] can be easily and reliably manufactured.

  Next, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an external view of an aluminum metal can (1) showing one preferred embodiment of the present invention.

  This illustrated metal can (1) is a two-piece can that is sealed by winding the lid (3) after filling the contents into a cylindrical can body (2) with a bottom formed by drawing and ironing. However, the application object of the present invention is not limited to this, and a three-piece can in which the bottom wall member is also attached by winding, or a base portion having a male screw at the upper end of the can body, The same applies to a bottle-shaped metal can equipped with a screw cap.

  The metal can (1) has a display portion (10) made of predetermined characters, symbols, figures, etc. at one or a plurality of locations in the circumferential direction of the can body (2). In the example shown in the figure, this display section (10) is made up of three characters “SAC” represented in a line in the horizontal direction in the axial direction.

  The display portion (10) is substantially convex by being embossed in a state of being precisely aligned with the printed display after it is preferably displayed in advance on the outer peripheral surface of the can body (2). It is formed so as to exhibit a squirrel appearance. Here, a substantially convex appearance is exhibited because, as will be described later, the outer surface or the top surface of the display unit (10) is located in the same plane as the reference outer peripheral surface of the can body (2), A groove-like recess (11) having a predetermined width and a predetermined cross-sectional shape is formed on the outer side along the outline (10a) of the display unit (10), although it does not protrude into the surface. This means that, in terms of appearance, the display portion (10) looks as if the display portion (10) protrudes from the outer peripheral surface of the can body (2) in a convex shape. Therefore, this is also expressed as a convex display portion (10). Further, the “reference outer peripheral surface” of the can body (2) means the outer peripheral surface of the can body (2) having a circular cross section before embossing the convex display portion (10), that is, the can body (2). It is used to mean an outer peripheral surface having a predetermined diameter in a portion other than the display portion that determines the outer diameter.

  The specific configuration of the convex display portion (10) and the groove-like concave portion (11) outside thereof will be described in more detail below.

  As shown in FIGS. 2 (A) and 2 (B), the convex display portion (10) is an arc whose outer surface or top surface (10b) is located in the same plane as the reference outer peripheral surface (2a) of the can body (2). Formed on the surface. Then, along the contour line (10a) of the convex display portion (10), a groove-shaped recess portion (11) is formed on the outer side thereof.

  The groove-shaped recess (11) is configured as a descending side wall surface portion (11a) whose side edge on the contour line (10a) side extends in a steep step toward the inside of the can body (2). Yes. And the rising bottom wall surface part (11b) extended in the shape of a gentle gradient from the groove bottom part at the lower end of the stepped descending side wall surface part (11a) toward the reference outer peripheral surface (2a) direction of the can body (2). And an arc-like connecting wall surface portion (11c) that is smoothly continuous from the outer side edge of the raised bottom wall surface portion (11b) to the reference outer peripheral surface (2a) of the can body (2). Accordingly, the groove-like recess (11) is substantially in the shape of a cross-sectional shape, which is a reverse hemispherical shape obtained by vertically inverting the letter “he” of Hiragana.

  As a result of the groove-shaped recess (11) having such a cross-sectional shape, the convex display portion (10) has a stepped descending side wall surface portion (11a) whose contour (10a) is steep. It has become a distinctive edge due to the existence of. On the other hand, the other outer edge of the groove-shaped recess (11) away from the contour line (10a) can be passed through the arc-shaped connecting wall surface portion (11c) following the gradually rising rising wall surface portion (11b). The cylinder (2) is smoothly continuous with the peripheral wall on the reference outer peripheral surface. As a result, the outer edge is formed in an erasing mode that is hardly noticeable in appearance.

  Accordingly, the groove-shaped recess (11) is hardly visible as a groove in the appearance of the metal can (1). This brings about the effect that the convex display part (10) is raised from the outer peripheral surface of the can body (2) and is formed to have a convex shape.

  Next, the preferable setting range on the dimension of the said convex-shaped display part (10) and a groove-shaped recessed part (11) is demonstrated with reference to FIG.

  First, a general metal can (1) to which the present invention is applied is a metal can having a diameter of 66.2 mm and a diameter of 52.6 mm that is widely used as a can for beverages such as beer.

  On the premise of such a general-purpose metal can (1), the dimensions of the convex display portion (10) and the groove-shaped recess portion (11) as a preferred embodiment of the present invention are as follows.

  First, the height of the convex display portion (10) depends on the depth D of the groove-shaped concave portion (11). In other words, the height of the descending side wall surface portion (11a) at one side edge of the groove-shaped recess (11), more specifically, the top surface (10b) of the convex display portion (10) and the descending side wall surface portion ( It depends on the distance to the lower end of 11a).

  Therefore, the depth D of the groove-like recess (11) is preferably set in the range of 0.15 to 0.35. When the depth D is less than 0.15 mm, the convex display portion (10) has poor stereoscopic effect. On the other hand, if it exceeds 0.35 mm, the embossing will be severe, which may cause peeling or cracking on the inner surface or outer surface of the can body. There is a risk of causing cracks in itself. The most preferable depth D is in the range of 0.2 to 0.3 mm with 0.25 mm as the center value.

  In addition, the set value of the width W of the groove-like recess (11) is one of the important factors that affect the suitability for the implementation of the present invention.

This width W is determined by the position of the contour line (10a) of the convex display portion (10), that is, the inflection point (P ₁ ) on the upper end side of the protruding corner radius portion toward the descending side wall surface portion (11a), and the rising bottom wall surface. It is defined by the distance between the arcuate connecting wall surface portion (11c) following the portion (11b) and the inflection point (P ₂ ) on the reference outer peripheral surface side of the can body (2).

  Therefore, a preferable range of the width W of the groove-like recess (11) is determined in relation to the depth D. That is, the width W is preferably set in a range of 5 ≦ W / D ≦ 100 with respect to the depth D. If the width W is less than 5D, the groove-like recessed portion (11) tends to be visually recognized as a groove, and the convex display portion (10) has a poor independent three-dimensional effect. On the contrary, when the width W is set to be wide such that it exceeds 100D, the three-dimensional effect of the convex display portion (10) can be emphasized, but this becomes a substantially protruding shape, Interference with each other on the transfer path is likely to cause clogging. A preferable range of the width W relative to the depth D is a range of 15 ≦ W / D ≦ 70, and a most preferable range is a range of 20 ≦ W / D ≦ 55.

In addition, the inclination angle θ ₁ of the descending side wall surface portion (11a) of the groove-shaped recess (11) is also an important element for making the convex display portion (10) appear clearly three-dimensionally. This inclination angle θ ₁ is defined as the angle of the descending sidewall surface portion (11a) with respect to the radial line (L ₁ ) of the can body (2) passing through the inflection point (P ₁ ).

Here, the inclination angle θ ₁ of the descending side wall surface portion (11a) of the groove-shaped recess (11) is desirably set in the range of 40 ° to 80 °. When this inclination angle θ ₁ is set to be less than 40 °, the embossing process for forming the convex display portion (10) breaks at the peripheral wall of the can body at the upper end portion or the lower end portion of the descending side wall surface portion (11a). There is a possibility that a weak point in strength due to thinning may occur. Conversely, when the inclination angle θ ₁ is set to a gentle gradient exceeding 80 °, it is difficult to express a clear three-dimensional effect on the convex display portion (10). A preferable range of the inclination angle θ ₁ is approximately 50 ° to 70 °, and a more preferable range is 60 ° to 65 °.

Furthermore, it is desirable that the inclination angle θ ₂ of the rising bottom wall surface portion (11b) of the groove-shaped recess portion (11) is set in the range of 0.5 ° to 10 °. The inclination angle theta ₂ is raised bottom for the groove-like recess (11) a line connecting the both side upper edge of the (L _2), i.e. above the inflection point (P ₁₎ (P ₂₎ a connecting line (L ₂₎ It is defined as the inclination angle of the wall surface portion (11b). When the inclination angle θ ₂ is less than 0.5 °, the width W of the groove-shaped recess (11) is increased, and the same problems as those described above when the width W is too large. Is derived. On the other hand, when the inclination angle θ ₂ is set to have a steep slope exceeding 10 °, the same problem as in the case where the width W is too small is derived. A preferable range of the angle θ ₂ is approximately 1 ° to 5 °, and a more preferable range is 1.5 ° to 2.5 °.

  In the implementation of the present invention, a specific example of the set numerical values of the above-mentioned respective parts considered to be most suitable is as follows.

Can body (2) outer diameter: 66.2 mm
Depth D of groove-shaped recess (11): 0.25 mm
Width W of groove-shaped recess (11): 13.0 mm
Width W / depth D: 52.0
Inclination angle θ _{1 of} descending side wall surface portion (11a): 63 °
Inclination angle θ _{2 of the} rising bottom wall surface portion (11b): 2 °

  In addition, the dimension and angle of each of the above-mentioned parts are determined by measuring the outer peripheral surface of the three-dimensional display part of the metal can after embossing by using a contactor (tip radius: 0.025 mm, shaft). (Diameter: 3 mm, tip angle: 12 °) is a value measured by scanning at a speed of 0.5 mm / s.

  Next, an embossing method for forming the convex display portion (10) will be described.

  The can body (2) is formed into a bottomed cylindrical shape by DI processing according to a conventional method, and then the outer peripheral surface is preliminarily subjected to cosmetic printing including a display portion.

  Thereafter, as shown in FIG. 4, the inner die roll (20) for embossing is inserted and arranged in the can body (2), and the embossed shape is also arranged opposite to the outside of the can body (2). The outer mold roll (30) is relatively moved in the proximity of the inner mold roll (20), and the peripheral wall of the can body (2) is sandwiched between the two mold rolls (20) and (30) with a predetermined nip pressure. At the same time, by rotating both mold rolls (20) and (30) synchronously, the display portion is embossed into a convex shape in a state where it is completely aligned with the display portion by printing, and is expected. The above-mentioned convex display part (10) is formed.

  Here, the inner-type roll (20) is made of a rigid roll made of steel or hard synthetic resin, and is displayed on a part of the outer circumferential surface in the circumferential direction as shown in FIGS. A recessed surface portion (21) having a predetermined depth and width occupying an area larger than the area of the portion (10) is provided in a form of a strip in the axial direction. And the step-shaped convex part (22) for display part formation which consists of a character etc. corresponding to a convex-shaped display part (10) is provided in this concave surface part (21). The stepped convex portion (22) has a top surface positioned in the same plane as the outer peripheral surface of the inner roll (20) and is set to a height that does not protrude outward, and has a contour portion. It is formed in a substantially vertical cross section along a radial line toward the centripetal direction.

  On the other hand, the outer roll (30) is also made of a rigid roll made of hard synthetic resin or the like, and the formation region of the step-shaped convex portion (22) for forming the display portion of the inner roll (20). Corresponding to the outer bulging portion (31) having a size occupying a slightly larger area than this region. The outwardly bulging portion (31) is formed so as to protrude outward from the outer peripheral surface of the outer die roll (30), and the height of the outer bulging portion (31) is the largest in the inner die roll (20 ) Has a depth substantially equal to the depth of the recessed surface portion (21), that is, the height of the step-shaped convex portion (22) for forming the display portion.

  In the outer bulging portion (31), the inner roll (20) is substantially similar to the step-shaped convex portion (22) for forming the display portion and slightly larger and shallower than the stepped convex portion (22). A step-shaped recessed portion (32) for forming the display portion is formed.

  Further, the top surface of the outwardly bulging portion (31) in the outer region portion of the stepped recess (32) for forming the display portion has a gentle downward slope toward the outer peripheral surface of the outer mold roll (30). The inclined surface (33) is formed.

  As shown in FIG. 6, the two rolls are synchronously rotated with the peripheral wall of the can body (2) sandwiched between the inner roll (20) and the outer roll (30). In addition, the step-shaped convex portion (22) for forming the display portion of the inner roll (20), the step-shaped concave portion (32) for forming the display portion of the outer roll (30) and the outer bulging portion ( The peripheral surface of the can body (2) is embossed with the inclined surface (33) of 31), and the projected display portion (10) and the groove-shaped recess portion (11) of the above-described aspect are shaped. Is done.

  That is, the convex portion (22) for forming the display portion of the inner roll (20) and the concave portion (32) of the same step of the outer roll (30) are formed on the peripheral wall of the can body (2). On the other hand, an outwardly bulging portion in which the concave surface portion (21) of the inner mold roll (20) and the top surface of the outer mold roll (30) are inclined surfaces (33) is formed. 31), a groove-shaped recess (11) is formed on the outer side along the contour line of the convex display portion (10).

  In this way, the inner mold roll (20) and the outer mold roll (30) for embossing are used, and the two mold rolls (20) (30) are sandwiched between them by sandwiching the peripheral wall of the can body (2). Using a very ordinary conventional embossing method of making one relative rotation synchronously, the convex display portion (10) as described above is not protruding from the reference outer peripheral surface of the can body (2). Regardless of the appearance, a metal can provided with a convex display portion (10) excellent in visibility and visibility, which appears to protrude from the reference outer peripheral surface of the can body peripheral wall. It can be easily and efficiently manufactured.

It is a perspective view which shows the external appearance of the metal can which shows the embodiment of this invention. 2A and 2B are cross-sectional views of the metal can of FIG. 1, in which FIG. 2A is an overall cross-sectional view taken along the line II-II of FIG. 1, and FIG. 2B is a portion B of FIG. FIG. 6 is a partial cross-sectional view showing the cross-sectional shape of FIG. It is explanatory drawing for demonstrating each suitable dimension setting range of the convex-shaped display part shaped by a can body, and a groove-shaped recessed part. It is a cross-sectional view which shows the embossing aspect which forms a convex-shaped display part. It is the external appearance perspective view which showed the inner mold roll for embossing, and the outer mold roll in the separated state. It is an expanded sectional view of the principal part which shows the embossing aspect of a convex-shaped display part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Metal can 2 ... Can body 10 ... Convex display part 10a ... Contour line of convex display part 10b ... Top surface of convex display part 11 ... Groove-shaped recessed part 11a ··· descending side wall surface portion 11b ··· rising bottom wall surface portion 11c ··· arc-shaped connecting wall surface portion 20 ··· inner roll 21 ··· concave surface portion ··· 22 stepped convex portion for display portion formation ··· outside Mold roll 31 ... outward bulging part 32 ... stepped recess part 33 for display part formation 33 ... inclined surface

Claims (6)

In a metal can provided with a display part consisting of letters, symbols, figures, etc. on the outer peripheral surface of the can body,
The display portion is formed with a groove-shaped recess having a predetermined width on the outer side along the outline of the display portion with the outer surface thereof being positioned in the same plane as the reference outer peripheral surface of the can body. , Formed with a substantially convex appearance,
The groove-shaped recess is formed from a steep descending side wall surface portion extending stepwise from one side edge of the display portion on the contour line side toward the inside of the can body, and a groove bottom portion at the lower end of the descending side wall surface portion. A gradually rising rising bottom wall surface extending in a slanting direction toward the reference outer peripheral surface of the can body, and an arc-shaped connecting wall surface smoothly extending from the outer side edge of the rising bottom wall surface portion to the reference outer peripheral surface of the can body A metal can having a three-dimensional display portion, wherein the outer edge of the groove-like recessed portion is formed in an erasing manner that is not conspicuous in appearance.   The metal can having a three-dimensional display portion according to claim 1, wherein the groove-shaped recess has a depth D set in a range of 0.15 to 0.35 mm.   The metal can having a three-dimensional display part according to claim 1 or 2, wherein the groove-like recess has a width W set to 5≤W / D≤100 with respect to a depth D. Lowering side wall portion of the groove-shaped recess is inclined an angle theta ₁ to the radius line of the can body is, the stereoscopic display according to claim 1 comprising is set in a range of 40 ° to 80 ° Metal can with parts. The rising bottom wall surface portion of the groove-like recess is configured such that an inclination angle θ ₂ with respect to a line connecting the upper edges on both sides of the groove-like recess is set in a range of 0.5 ° to 10 °. The metal can which has the three-dimensional display part of any one of these. An inner mold roll for embossing inserted into the can body and an outer mold roll for embossing disposed opposite to the inner mold roll, and the peripheral wall of the can body of the metal can between them Is an embossing method for forming a convex display portion made up of characters, symbols, figures, etc. on the peripheral wall of the can body by rotating relative to each other,
The inner-type roll has a recessed surface portion that occupies an area larger than the display portion on the outer peripheral surface, and a display portion forming step shape in which the top surface is located in the same plane as the outer peripheral surface of the inner-type roll. While having a convex portion,
The outer roll is a built-up outer bulge having an area slightly larger than the formation area of the step-shaped convex portion for forming the display portion of the inner roll, and the inner roll in the outer bulge. And the top surface of the outwardly bulging portion in the outer region portion of the recessed portion is the outer peripheral surface of the outer roll. It is formed on an inclined surface inclined with a gentle gentle slope toward the
The convex part for forming the display part of the inner roll and the stepped concave part of the outer roll form the convex display part on the peripheral wall of the can body. A groove-shaped recess having an erasing aspect in which the outer edge is not noticeable in appearance is formed on the outer side along the contour line of the convex display portion with the outwardly bulging portion of the mold roll. Embossing method for metal cans.