JP2019172271A - Can body - Google Patents

Abstract

To provide a can body of which beauty and sanitation of a mouth are improved.SOLUTION: A can body has a curl part, which is formed in such a manner that a cut tip is folded to an outer side in a radial direction, at an opening. A cross-sectional area of a space part inside the curl part is 4 mmor more in a cross section along a can axis direction passing through a can axis, and a gap is formed between an external surface on a base end side of the curl part and the cut tip over the whole circumference of the curl part. Further, in the cross section along the can axis direction passing through the can axis, a distance of the gap in the radial direction is so made as to be equal to or more than two times a plate thickness of the curl part at the cut tip.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a bottle-shaped can body having a curl portion at an opening portion to which a cap is attached.

  As a container filled with beverages and other contents, a metal cap (cap) is attached to the opening of a bottle-shaped can (bottle can) made of steel, aluminum alloy, etc., and the inside is sealed with a liner on the inner surface of the cap. Such a structure is known. In the opening of such a can body, a curled portion having the same shape as the bottle mouth is formed, and the inside of the can body is sealed by attaching the skirt portion of the cap around the curled portion. . For this reason, the curl part is formed relatively large with respect to the opening part of the can body.

  For example, in Patent Document 1, a board part (curl part) formed by curling the front end part of a mouth part outwardly is made of metal in which a cap for tearing and opening a score by pulling a tab is tightened and fixed. A can is disclosed. And this patent document 1 describes that it is the structure where the curled tip part of the bead part contacted the outer surface of the mouth part.

  In the metal bottle can disclosed in Patent Document 2, a diameter-reduced portion that is reduced in diameter from the upper end of the mouth portion, a raised portion that extends upward from the upper end of the reduced-diameter portion, an upper bent portion that is an upper end of the raised portion, and an upper portion thereof A curved portion that extends downward and protrudes outward while smoothly spreading outward from the bent portion, a lower bent portion at the lower end of the bent portion, and a straight portion that linearly extends from the lower bent portion to the reduced diameter portion Are formed. 2, 4-9, etc. of Patent Document 2 describe a state in which the tip of the curled portion is in contact with the outer surface of the mouth portion.

International Publication No. 2007/122971 JP 2011-116456 A

  As described in Patent Document 1 and Patent Document 2, in the can body in which the cap is mounted by winding the skirt portion of the cap around the curled portion, the tip of the curled portion is in contact with the outer surface of the mouth portion, and Thus, a relatively large space is formed inside the curled portion. However, it is difficult to make the tip of the curled portion fully contact with the entire circumference of the mouth portion, and the tip of the curled portion is partially brought into contact with the mouth portion. For this reason, when the cap body is filled with the contents and the cap is tightened, the surplus contents spill, and the curl portion is formed from a slight gap formed between the tip of the curl portion and the outer surface of the mouth portion. There is a risk of entering the space inside. In addition, excess contents that have entered the space inside the curl portion cannot be completely removed even if the bottle container is washed from the outside after the cap is tightened, and washing water enters the space portion during washing. There is also a fear. As a result, liquids such as contents contained in the space inside the curl portion may flow out when the bottle container is transported. In this case, not only the outer surface of the mouth is soiled by the excess liquid such as liquid, but the appearance is impaired, and there is a concern about hygiene due to exposure of the liquid to the outside.

  This invention is made | formed in view of such a situation, and it aims at providing the can which improved the beauty | look of the mouth part and the hygiene side.

The can body of the present invention has a curl portion formed by folding a cutting tip portion radially outward in an opening, and a space inside the curl portion in a cross section along the can axis direction passing through the can shaft. The cross-sectional area of the portion is 4 m ² or more, and a gap is formed between the outer surface on the proximal end side of the curled portion and the cutting tip portion over the entire circumference of the curled portion.

In the case of a large curled portion having a cross-sectional area of 4 mm ² or more in the inner space portion, the size of the inner space portion into which liquid such as excess contents will enter increases. In this regard, in the can body of the present invention, a gap is formed between the outer surface on the proximal end side of the curled portion and the cutting distal end portion over the entire circumference of the curled portion. For this reason, the liquid that has entered the space portion inside the curl portion is easily discharged to the outside through the annular gap opened in the circumferential direction, and is difficult to stay in the space portion. Further, since the inside of the space can be easily cleaned through the gap during cleaning, the liquid can be efficiently washed away, the appearance of the mouth can be beautiful, and the mouth can be kept hygienic.

  As a preferred embodiment of the can body of the present invention, in the cross section along the can axis direction passing through the can axis, the radial distance of the gap is not less than twice the plate thickness of the curled portion at the cutting tip. Good size.

  By forming the radial distance of the gap provided between the outer surface of the proximal end side of the curled portion and the cutting tip portion to be twice or more the plate thickness of the curled portion at the cutting tip portion, The liquid that has entered the space inside the curl portion can be reliably washed out through the gap without staying in the space.

  As a preferred embodiment of the can body of the present invention, the cutting tip portion may be arranged downward in the can axis direction.

  By disposing the cutting tip of the curled part downward in the can axis direction, the liquid that has entered the space inside the curled part can be smoothly externalized along the shape of the curled part without remaining in the space. Can be discharged.

  According to the present invention, since the gap is formed over the entire circumference in the space portion inside the curl portion, it is difficult for excess contents to stay in the space portion, and the space portion inside the curl portion through the gap in the curl portion. Can be easily washed, so that the appearance of the mouth can be kept beautiful and the mouth can be kept hygienic.

It is the front view which made the right half of the bottle container using the can of 1st Embodiment of this invention the cross section which passes along a can axis | shaft. It is principal part sectional drawing which made the upper part vicinity of the trunk | drum of the can body shown in FIG. 1 the cross section which passes a can axis | shaft. It is principal part sectional drawing of the mouth part vicinity of the can shown in FIG. It is principal part sectional drawing which made the cross section which passes along a can axis | shaft the upper part vicinity of the trunk | drum of the can body of 2nd Embodiment of this invention. It is principal part sectional drawing of the mouth part vicinity of the can shown in FIG. It is principal part sectional drawing which made the cross section which passes along a can axis | shaft the upper part vicinity of the trunk | drum of the can body of 3rd Embodiment of this invention. It is principal part sectional drawing of the mouth part vicinity of the can shown in FIG. It is a schematic diagram explaining the washing | cleaning method of a bottle container.

Hereinafter, embodiments of a can according to the present invention will be described with reference to the drawings.
(First embodiment)
As shown in FIGS. 1 and 2, the can body (bottle can) 101 according to the first embodiment of the present invention is formed into a bottle shape as a whole, and has a curled portion 51 in an opening 15 that opens to the outside. The can body 101 is opened by attaching (clamping) a cap 201 to the mouth portion 14 as shown in FIG. The part 15 is sealed to form a bottle container 301. FIG. 1 shows a bottle container 301 including a can body 101 and a cap 201 attached to the mouth portion 14 of the can body 101. In FIG. 1, the right half of the bottle container 301 is shown as a cross section passing through the can axis C.

  The can body 101 is made of a thin plate metal such as aluminum or aluminum alloy, and includes a cylindrical body portion (wall) 10 and a disk-shaped bottom portion (bottom) 20 as shown in FIG. It is formed in a bottom cylindrical shape.

  As shown in FIG. 1, the trunk | drum 10 and the bottom part 20 are mutually arrange | positioned coaxially, In this embodiment, these common shafts are called the can axis | shaft C, and it demonstrates. Of the directions along the can axis C (the can axis C direction), the direction from the opening 15 toward the bottom 20 is the lower side (downward), and the direction from the bottom 20 toward the opening 15 is the upper side (upper). In the following description, the vertical direction is determined in the same manner as the direction shown in FIG. A direction perpendicular to the can axis C is referred to as a radial direction. Of the radial directions, the direction approaching the can axis C is the inside (inward) in the radial direction, and the direction away from the can axis C is the outside in the radial direction ( Outside). Moreover, let the direction which goes around the can axis | shaft C be a circumferential direction.

  In the present embodiment, the bottom portion 20 of the can body 101 is located on the can shaft C and is formed so as to bulge upward (inside the trunk portion 10), and the dome portion 21. The heel part 22 which connects the outer peripheral edge part and the lower end part of the trunk | drum 10 is provided. In addition, the connecting portion between the dome portion 21 and the heel portion 22 is on the grounding surface (mounting surface) so that the can body 101 is in an upright posture (the posture in which the opening 15 shown in FIG. 1 faces upward). When placed, the grounding portion 23 is in contact with the grounding surface. The grounding portion 23 protrudes most downward in the bottom portion 20 and has an annular shape extending along the circumferential direction.

  As shown in FIG. 1, the barrel portion 10 of the can body 101 has a cylindrical portion 11 formed in a cylindrical shape on the lower side (bottom portion 20 side) of the barrel portion 10, and a radially inner portion at the upper end of the cylindrical portion 11. A shoulder 12 having a diameter reduced upward in the direction of the can axis C, a neck 13 connected to the upper end of the shoulder 12 and extending upward in the direction of the can axis C, and an upper end of the neck 13 And a mouth portion 14 connected to the outside and opening to the outside. The cylindrical portion 11, the shoulder portion 12, the neck portion 13, and the mouth portion 14 each have an annular shape that extends over the entire circumference of the trunk portion 10.

  Among these, as shown in FIGS. 1-3, the neck part 13 is made into the shape diameter-reduced gradually toward the upper direction of the can-axis C direction, rather than the cylindrical part 11 formed in the lower part of the trunk | drum 10. It has a small diameter. Moreover, the upper end of the neck part 13 is formed in the smallest diameter. In the can body 101 of the present embodiment, the neck portion 13 includes a concave connection concave portion 31 that protrudes radially inward continuously from the upper end of the shoulder portion 12 and a can axis C direction continuous to the upper end of the connection concave portion 31. And a tapered cylindrical portion 32 that gradually decreases in diameter toward the center. The upper end of the tapered cylinder portion 32 is connected to the lower end of the mouth portion 14.

  The mouth portion 14 is formed continuously from the upper end of the tapered cylindrical portion 32, and has a large diameter portion 41 once expanded at the upper end of the tapered cylindrical portion 32 and reduced in diameter again at the upper end of the large diameter portion 41. A small-diameter portion 42 and a curled portion 51 formed at the upper end of the small-diameter portion 42 are provided.

  As shown in FIG. 3, the curled portion 51 has a cross-section (vertical cross section) along the can axis C direction passing through the can axis C, and the cutting tip portion 141 of the can body 101 is radially outwardly perpendicular to the can axis C. It has a relatively large space 150 inside. Further, as shown in FIG. 3, the cutting tip portion 141 is disposed away from the outer surface on the proximal end side of the curled portion 51, and cuts with the outer surface on the proximal end side of the curled portion 51 over the entire circumference of the curled portion 51. A gap G is formed between the tip portion 141.

  In the present embodiment, as shown in FIG. 3, the curled portion 51 is continuous with the upper end of the small-diameter portion 42 that is inclined at a predetermined angle with respect to the can axis C in a cross section along the can axis C direction passing through the can axis C. An inner circumferential tapered portion 149 that gradually decreases in diameter toward the upper side in the can axis C direction, and an inner circumferential lower bent portion 143 that bends at the upper end of the inner circumferential tapered portion 149 so as to be parallel to the can axis C direction, An inner peripheral cylindrical portion 144 extending vertically from the upper end of the inner peripheral lower bent portion 143 in parallel to the can axis C toward the upper side in the can axis C direction, and radially outward from the upper end of the inner peripheral cylindrical portion 144 An inner peripheral upper bent portion 145 that is bent so as to spread toward the outer periphery, a zenith portion 142 that extends horizontally outward from the outer peripheral edge of the inner peripheral upper bent portion 145, and a can axis C from the outer peripheral edge of the zenith portion 142. An outer peripheral upper bent portion 146 that is bent so as to be folded downward in the direction, and an outer peripheral upper bent An outer peripheral side cylindrical portion 147 extending vertically downward from the outer peripheral edge of the portion 146 in parallel to the can axis C toward the lower side of the can axis C direction, and the lower end of the outer peripheral side cylindrical portion 147 and the inner side in the radial direction of the can axis C An outer peripheral lower bent portion 148 that is bent toward the outer side, and an inwardly tapered curled end portion that extends from the lower end of the outer peripheral lower bent portion 148 toward the middle position in the can axis C direction in the small diameter portion 42 while being reduced in diameter. 151 are continuously formed.

  Further, in the present embodiment, as shown in FIG. 3, the curled end portion 151 is formed in a substantially straight tapered shape, and the cutting distal end portion 141 disposed at the distal end of the curled end portion 151 is in the can axis C direction. It is arranged facing down. The end surface of the cutting tip portion 141 is disposed to face the outer surface of the small diameter portion 42, and the lower end 141 a of the cutting tip portion 141 disposed at the tip of the curled end portion 151 is disposed at the lowest position in the curled portion 51. . For this reason, in the small diameter portion 42, the position facing the lower end 141 a of the cutting tip portion 141 is the base end position of the curled portion 51. In FIG. 3, the base end position of the curled portion 51 is indicated by a broken line A.

  In this way, the curled portion 51 has a shape of a portion formed on the upper side in the can axis C direction from the lower end 141a of the cutting tip portion 141. In the present embodiment, the small-diameter portion 42 and the inner peripheral tapered portion 149 are formed in one continuous, that is, tapered shape having the same inclination angle β, and the base end position A is the boundary in the direction of the can axis C. The lower portion is a small diameter portion 42 and the upper portion is an inner circumferential tapered portion 149. Accordingly, the shape from the inner peripheral taper portion 149 disposed above the base end position A in the can axis C direction to the tip of the curl end 151 (cutting tip 141) is the curl 51.

Further, as shown in FIG. 3, the space 150 formed inside the curled part 51 has a range (cross-sectional area S) surrounded by the inner surface of the curled part 51. In FIG. 3, the cross-sectional area S of the space 150 is hatched. Specifically, in the cross-sectional view of FIG. 3, the space 150 is directed radially inward from the upper end 141 b of the cutting tip 141 where the end surface of the cutting tip 141 and the inner surface of the curl 51 intersect. Thus, the portion is arranged inside the line L drawn horizontally. Then, in a section along the can axis C passing through the can axis C shown in FIG. 3, the cross-sectional area of the space 150 S (mm ²⁾ it is a 4 mm ² or more, and preferably from 10 mm ² or less. Thus, the space part 150 inside the curled part 51 has a relatively large cross-sectional area S.

  On the other hand, the space portion 150 of the curled portion 51 is opened to the outside through the gap G. As shown in FIG. 3, the gap G is a radial distance (horizontal distance) in a cross section along the can axis C direction passing through the can axis C. The gap G is preferably provided in a size (G ≧ 2t) that is twice or more the plate thickness t of the curled portion 51 in the cutting tip portion 141, more preferably 3 or less in the plate thickness t (G ≦ 3t). ). The gap G is smaller than the radial thickness T of the curled portion 51 described later.

  The width W (mm) of the curled part 51 in the can axis C direction is a vertical distance parallel to the can axis C from the upper end position of the curled part 51 in the can axis C direction to the lower end position of the curled part 51. In the cross section along the can axis C direction passing through the can axis C shown in FIG. 3, the zenith portion 142 is disposed at the uppermost position in the can axis C direction of the curled portion 51, and the lower end 141 a (base end position A) of the cutting tip portion 141. ) Is arranged at the lowermost position in the direction of the can axis C of the curled portion 51, and the width W is a vertical distance from the outer surface of the zenith portion 142 to the lower end 141a of the cutting tip portion 141. The radial thickness T (mm) of the curled portion 51 is a horizontal distance orthogonal to the can axis C from the innermost diameter position to the outermost diameter position of the curled portion 51 in the radial direction. In the cross section along the can axis C direction passing through the can axis C shown in FIG. 3, the inner peripheral cylindrical portion 144 is disposed at the innermost position in the radial direction of the curled portion 51, and the outer peripheral cylindrical portion 147 is the curled portion 51. It is arranged at the outermost position in the radial direction, and the thickness T is the horizontal distance from the outer surface of the inner peripheral side cylindrical portion 144 to the outer surface of the outer peripheral side cylindrical portion 147.

  In the present embodiment, when the outer diameter of the curled portion 51 is D, the ratio (T / D) between the outer diameter D and the thickness T is 0.07 or more and 0.12 or less, and the thickness T of the curled portion 51 is It is formed in a size of 7% to 12% of the outer diameter D. Specifically, for example, in the can body 101 in which the outer diameter D of the curled portion 51 is 25 mm or more and 40 mm or less, the thickness T of the curled portion 51 is 2.0 mm or more and 4.5 mm or less, preferably 3.0 mm or more and 4 0.0 mm or less. Further, the width W of the curled portion 51 is set to 3.0 mm to 5.0 mm, preferably 3.5 mm to 4.7 mm. If the thickness T of the curled portion 51 exceeds 4.5 mm, cracks are likely to occur during the molding process of the curled portion 51. On the other hand, when the thickness T is smaller than 2.0 mm, it is difficult to obtain a predetermined shape in the outer peripheral upper bent portion 146 in the molding process.

  In FIG. 3 and the like, a slightly straight outer peripheral cylindrical portion 147 is formed on the outer peripheral side of the curled portion 51, but does not have the outer peripheral cylindrical portion 147 and continues to the outer peripheral upper bent portion 146. The curled portion 51 may be formed of a continuous curved surface (bending surface) by providing the outer peripheral lower side bending portion 148. In this case, the connection position between the lower end of the outer peripheral upper bent portion 146 and the upper end of the outer peripheral lower bent portion 148 is the outermost diameter position of the curled portion 51. Further, the zenith part 142 arranged at the upper end of the curled part 51 is also formed with a predetermined thickness in the radial direction, and the outer peripheral edge of the inner peripheral upper bent part 145 and the inner peripheral edge of the outer peripheral upper bent part 146 are continuous. It may be formed on a curved surface. In this case, the connection position between the outer peripheral edge of the inner peripheral upper bent portion 145 and the inner peripheral edge of the outer peripheral upper bent portion 146 is the zenith portion 142.

  In the present embodiment, the radius of curvature R12 (mm) of the outer peripheral upper bent portion 146 arranged on the outer peripheral side of the curled portion 51 is sufficiently larger than the radius of curvature R11 (mm) of the inner peripheral upper bent portion 145. Largely formed. In addition, the radius of curvature R13 (mm) of the outer peripheral lower bent portion 148 continuous to the lower end of the outer peripheral cylindrical portion 147 at the outermost diameter position is formed to be smaller than the radius of curvature R12 of the outer peripheral upper bent portion 146. It is formed with a moderate (large) radius of curvature. The radius of curvature R11 of the inner peripheral upper side bent portion 145, the radius of curvature R12 of the outer peripheral upper side bent portion 146, and the radius of curvature R13 of the outer peripheral lower side bent portion 148 may each be formed as a single radius of curvature. A plurality of arcs having different radii of curvature may be formed continuously.

  As shown in FIG. 3, the radius of curvature R11 of the inner peripheral upper side bent portion 145 arranged on the inner peripheral side of the curled portion 51 with the radius of curvature on the outer surface of the curled portion 51 is, for example, 0.5 mm or more and 2.0 mm or less, Preferably it is 0.5 mm or more and 1.0 mm or less. Moreover, the curvature radius R12 of the outer periphery upper side bending part 146 arrange | positioned at the outer peripheral side of the curl part 51 is 1.5 mm or more and 3.5 mm or less, for example, Preferably it is 2.0 mm or more and 3.0 mm or less. The radius of curvature R13 of the outer peripheral lower bent portion 148 is formed to be 0.5 mm or more and 1.2 mm or less. In addition, an angle α formed by the outer surface of the curled end portion 151 and a horizontal line orthogonal to the can axis C direction is set to, for example, 0 ° to 45 °. In addition, an angle β formed by the outer surface of the inner peripheral tapered portion 149 and a vertical line parallel to the can axis C is set to, for example, more than 0 ° and 20 ° or less.

  In addition, when the radius of curvature R12 of the outer peripheral upper bent portion 146 is larger than 3.5 mm, the sealing performance is deteriorated, and when it is smaller than 1.5 mm, the mouth feel is deteriorated, and cracks and wrinkles may occur when the curled portion 51 is formed. There is. Moreover, when the curvature radius R13 of the outer periphery lower side bending part 148 is larger than 1.2 mm, fitting property with the cap 201 will worsen. On the other hand, if the radius of curvature R13 is smaller than 0.5 mm, the curled part 51 may be cracked or wrinkled during the molding process of the curled part 51.

  However, the said dimension of the can 101 is not restricted to the said numerical range. Further, the other dimensions of the can body 101 are not limited. Taking other examples of other dimensions of the can body 101 as well, the plate thickness of the can body 101 is such that the original plate thickness of the aluminum alloy plate before forming is 0.250 mm to 0.500 mm, and the plate thickness at the curled portion 51 is Is 0.200 mm to 0.400 mm. When the plate thickness t of the curled portion 51 at the cutting tip portion 141 is 0.200 mm or more and 0.400 mm or less, the gap G is set to 0.400 mm to 1.200 mm or less.

  As shown in FIG. 1, the can body 101 configured in this manner is provided with a cap 201 in the opening 15 of the mouth portion 14 to form a bottle container 301. Specifically, after filling the inside of the can body 101, the cap 201 is put on the mouth portion 14. Then, by pressing the cap 201 downward from the upper direction of the can axis C and compressing the sealing material 112, the skirt portion 111 of the cap 201 is pressed radially inward by the nail of the tool. The skirt portion 111 is deformed so as to follow the outer surface of the curled portion 51. As a result, the lower end portion of the skirt portion 111 is wound around the curled end portion 151 of the curled portion 51, and the cap 201 is attached to the can body 101.

  In the mounted state of the cap 201, the lower end portion of the cap 201 is hooked from the outer peripheral lower bent portion 148 of the curled portion 51 to the curled end portion 151. The sealing material 112 is brought into close contact with the bent portion 148, so that the inside of the can body 101 can be reliably sealed. On the other hand, by removing the cap 201 from the mouth portion 14, the opening 15 of the can body 101 is opened, and the contents filled in the can body 101 can be poured out.

As described above, in the can body 101 of the present embodiment, the cross-sectional area S of the space part 150 has the curled part 51 having a size of 4 mm ² or more, but the base end side of the curled part 51 over the entire circumference of the curled part 51. A gap G is formed between the outer surface of the cutting member and the cutting tip 141. For this reason, when the cap 201 is attached to the mouth portion 14, even if liquid such as excess contents filled in the can body 101 spills and enters the space portion 150, the annular shape opened in the circumferential direction It is easy to be discharged from the gap G to the outside, and it is difficult to stay in the space 150. Further, when the bottle container 301 is cleaned, the space 150 can be easily cleaned through the gap G, so that the liquid can be efficiently washed away.

  Further, in the curled part 51, the gap G is formed to be twice or more the plate thickness t of the curled part 51 at the cutting tip part 141, so that it enters the space part 150 inside the curled part 51. The liquid can be reliably washed out through the gap G without staying in the space 150. Furthermore, since the cutting tip portion 141 of the curled portion 51 is arranged downward in the can axis C direction, the liquid that has entered the space portion 150 can be smoothly discharged to the outside along the shape of the curled portion 51. Accordingly, in the can body 101, the appearance of the mouth portion 14 can be kept beautiful and the mouth portion 14 can be kept hygienic.

(Second Embodiment)
4 and 5 show a can body 102 according to a second embodiment of the present invention. In the description of the second embodiment and FIGS. 4 and 5, the same reference numerals are used to simplify the description of the same parts as those in the first embodiment.

  In the can body 101 of the first embodiment described above, the diameter of the large diameter portion 41 once expanded at the upper end of the tapered cylindrical portion 32 of the neck portion 13 and the upper diameter of the large diameter portion 41 are reduced again at the lower portion of the mouth portion 14. The tapered cylindrical portion 32 of the neck portion 13 and the curled portion 51 of the mouth portion 14 are connected via the large diameter portion 41 and the small diameter portion 42. On the other hand, in the can body 102 of the second embodiment shown in FIGS. 4 and 5, a curled portion 52 is formed continuously with the tapered cylindrical portion 32 of the neck portion 13.

  Further, in the can body 102 of the second embodiment, the curled end portion 152 extends horizontally inward in the radial direction, and the cutting distal end portion 141 disposed at the distal end of the curled end portion 152 is in the radial direction. It is arranged inward. The end surface of the cutting tip portion 141 is disposed to face the outer surface of the tapered cylindrical portion 32, and the lower end 141 a of the cutting tip portion 141 disposed at the tip of the curled end portion 152 is disposed at the lowest position in the curled portion 52. The For this reason, the position facing the lower end 141 a of the cutting distal end portion 141 in the tapered cylindrical portion 32 is the proximal end position of the curled portion 52. In FIG. 5, the base end position of the curled portion 52 is indicated by a broken line A. The shape of the portion formed on the upper side in the can axis C direction with respect to the lower end 141 a of the cutting tip portion 141 is the curled portion 52.

  In the present embodiment, the tapered cylindrical portion 32 and the inner peripheral tapered portion 149 are formed in one continuous, that is, tapered shape having the same inclination angle γ, and the can shaft C is bordered on the base end position A. The lower portion in the direction is a tapered cylindrical portion 32, and the upper portion is an inner circumferential tapered portion 149. Accordingly, the shape from the inner peripheral tapered portion 149 disposed above the base end position A in the direction of the can axis C to the tip of the curled end 152 (cutting tip 141) is the curled portion 52. Note that the inclination angle γ is an angle formed between the outer surface of the inner peripheral tapered portion 149 and a vertical line parallel to the can axis C in a longitudinal section along the can axis C direction passing through the can axis C, for example, exceeding 0 °. Provided at 20 ° or less.

Also in the can body 102 of the second embodiment, the cross-sectional area S of the space portion 150 inside the curled portion 52 is 4 mm ² or more, but from the outer surface on the proximal end side of the curled portion 52 over the entire circumference of the curled portion 52. The cutting tip portion 141 is spaced apart and a gap G is formed between the outer surface on the proximal end side of the curled portion 52 and the cutting tip portion 141. For this reason, the liquid that has entered the space 150 through the annular gap G opened in the circumferential direction is easily discharged to the outside, and is difficult to stay in the space 150. Further, since the space 150 can be easily cleaned through the gap G, the liquid can be efficiently washed away.

  Also, in the curled portion 52, the gap G is formed to be twice or more the plate thickness t of the curled portion 52 at the cutting tip portion 141, so that the liquid that has entered the space portion 150 inside the curled portion 52 can be removed. Rather than staying in the space 150, it can be reliably washed through the gap G. Further, the cutting tip portion 141 of the curled portion 52 is disposed inward in the radial direction, and the curled end portion 152 is disposed horizontally inward in the radial direction (the outer surface of the curled end portion 152). And the horizontal line perpendicular to the can axis C direction α = 0 °), the liquid that has entered the space 150 can be prevented from staying in the space 150, and the liquid can be smoothly discharged from the gap G to the outside. Therefore, also in the can body 102, the appearance of the mouth portion 14 can be kept beautiful, and the mouth portion 14 can be kept hygienic.

(Third embodiment)
6 and 7 show a can body 103 according to a third embodiment of the present invention. In the description of the third embodiment and FIGS. 6 and 7, the same reference numerals are used to simplify the description of the same parts as those in the first and second embodiments described above.

  In the can body 102 of the first embodiment and the can body 102 of the second embodiment described above, the can is inclined at a predetermined angle (β, γ) with respect to the can axis C on the inner peripheral side of the curled portions 51, 52. Although the inner circumferential taper portion 149 that gradually decreases in diameter toward the upper side in the axis C direction is provided, the inner circumferential taper portion 149 is not provided and the parallel to the can axis C is provided as in the can body 103 of the third embodiment. It is also possible to provide a curled portion 53 in which an inner peripheral cylindrical portion 144 that extends vertically toward the upper side in the direction of the can axis C is formed.

  As shown in FIG. 6, in the can body 103, the neck portion 13 is continuous with the upper end of the shoulder portion 12, and has a concave connection concave portion 31 that is convex inward in the radial direction, and the upper end of the connection concave portion 31. A taper-shaped tapered cylindrical portion 32 that gradually decreases in diameter toward the can axis C direction, a lower bent portion 33 that continues to the upper end of the tapered cylindrical portion 32 and is bent so as to be parallel to the can axis C direction, and a lower bent portion An intermediate cylindrical portion 34 extending vertically from the upper end of the portion 33 in parallel to the can axis C toward the upper side in the can axis C direction. An inner peripheral cylindrical portion 144 of the curled portion 53 is formed continuously with the upper end of the intermediate cylindrical portion 34 of the neck portion 13. In addition, the shape of the neck part 13 is not limited to the shape of 1st-3rd embodiment, Various shapes can be employ | adopted.

  In the can body 103 of the third embodiment, the curled end portion 152 extends horizontally inward in the radial direction, and the cutting tip portion 141 disposed at the distal end of the curled end portion 152 is inward in the radial direction. It is arranged toward the. The end surface of the cutting tip portion 141 is disposed to face the outer surface of the intermediate cylindrical portion 34, and the lower end 141 a of the cutting tip portion 141 disposed at the tip of the curled end portion 152 is disposed at the lowest position in the curled portion 53. The Therefore, the position of the intermediate cylindrical portion 34 that faces the lower end 141 a of the cutting tip 141 is the base end position of the curled portion 53. In FIG. 7, the base end position of the curled portion 53 is indicated by a broken line A. The shape of the portion formed on the upper side in the can axis C direction from the lower end 141 a of the cutting tip portion 141 is the curled portion 53. In the present embodiment, the intermediate cylindrical portion 34 and the inner peripheral side cylindrical portion 144 are formed in one continuous shape, and the lower portion in the can axis C direction with the base end position A as the boundary is the intermediate cylinder. The portion 34 and the upper portion are the inner peripheral cylindrical portion 144. Accordingly, the shape from the inner peripheral side cylindrical portion 144 disposed above the base end position A in the direction of the can axis C to the tip of the curl end 152 (cutting tip 141) is the curl 53.

  In the curled portion 53, the outer peripheral edge of the inner peripheral upper bent portion 145 and the inner peripheral edge of the outer peripheral upper bent portion 146 are formed with a curved surface. The connecting position with the inner peripheral edge of the outer peripheral upper side bent portion 146 is the zenith portion 142 arranged at the uppermost position in the can axis direction in the curled portion 53.

Also in the can body 103 of the third embodiment, the cross-sectional area S of the space portion 150 inside the curled portion 53 is 4 mm ² or more, but the outer surface on the proximal end side of the curled portion 53 over the entire circumference of the curled portion 53 A gap G is formed between the cutting tip 141. For this reason, the liquid that has entered the space 150 through the annular gap G opened in the circumferential direction is easily discharged to the outside, and is difficult to stay in the space 150. Further, since the space 150 can be easily cleaned through the gap G, the liquid can be efficiently washed away.

  Further, in the curled portion 53, the gap G is formed to have a size more than twice the plate thickness t of the curled portion 53 at the cutting tip portion 141, so that the liquid that has entered the space portion 150 inside the curled portion 53 can be obtained. Rather than staying in the space 150, it can be reliably washed through the gap G. Further, the cutting tip portion 141 of the curled portion 53 is arranged inward in the radial direction, and the curled end portion 152 is arranged horizontally inward in the radial direction (the outer surface of the curled end portion 152). And the horizontal line perpendicular to the can axis C direction α = 0 °), the liquid that has entered the space 150 can be prevented from staying in the space 150, and the liquid can be smoothly discharged from the gap G to the outside. Therefore, also in the can 103, the appearance of the mouth portion 14 can be kept beautiful, and the mouth portion 14 can be kept hygienic.

In addition, this invention is not limited to the thing of the structure of the said embodiment, In a detailed structure, a various change can be added in the range which does not deviate from the meaning of this invention.
For example, in the above embodiment, a bottomed cylindrical can body in which the bottom portion 20 and the body portion 10 are integrally formed has been described. However, the can body does not necessarily include a bottom portion, After molding, the body part includes a part formed by winding a separately formed bottom part.

  The cans of Examples and Comparative Examples of the present invention were produced. Conditions such as dimensions of each can body are as shown in Table 1. Among these, for the cans of Example 1 and Example 2, the cutting tip was separated from the outer surface on the base end side of the curl part, and a gap G was formed all around the curl part. On the other hand, the can bodies of Comparative Example 1 and Comparative Example 2 were formed such that the cutting tip portion was brought into contact with the outer surface on the proximal end side of the curled portion. In addition, in the cans of Comparative Examples 1 and 2, the cutting tip portion could not be brought into contact with the entire circumference of the curled portion, and a gap G was partially formed. And about each can body, after making the fixed amount (70 micrograms as aluminum) aluminum solution adhere to the lower part of a curl part, the cap was attached to the opening part and the bottle container was produced.

  Next, as illustrated in FIG. 8, each bottle container 301 was cleaned using a cleaning evaluation apparatus that jets water from the left and right sides (arrows B <b> 1 and B <b> 2) and the top surface side (arrow B <b> 3) of the cap 201. The bottle container 301 was washed by being retained in the washing evaluation apparatus for 1 second or 5 seconds. After washing, the bottle container was immersed in an extract (dilute hydrochloric acid) and subjected to ultrasonic cleaning for 1 minute. And the aluminum concentration contained in an extract was measured with the atomic absorption photometer, and the residual amount of aluminum which could not be washed was confirmed. The residual amount Y of aluminum thus obtained is compared with the applied amount X of aluminum applied before washing, and the residual rate of aluminum that cannot be removed by washing {(Y / X) × 100} (%) Was calculated. The results are shown in Table 2.

  As can be seen from the results in Table 2, the residual ratio of aluminum can be reduced for Example 1 and Example 2 provided with the gap G over the entire circumference of the curled part, compared with Comparative Example 1 and Comparative Example 2. . Further, with respect to Example 1 in which the gap G is provided with a size that is twice or more the plate thickness t, the angle α is larger than 0 °, and the tip of the curl portion (cutting tip) is disposed downward. The residual ratio of aluminum could be made smaller than in Example 2. As can be seen from these results, by separating the cutting tip from the outer surface on the base end side of the curled portion and forming a gap G over the entire circumference of the curled portion, the liquid or the like that has entered the space portion can be efficiently removed. The mouth can be washed away, the appearance of the mouth can be kept beautiful, and the mouth can be kept hygienic.

DESCRIPTION OF SYMBOLS 10 trunk | drum 11 cylindrical part 12 shoulder part 13 neck part 14 mouth part 15 opening part 20 bottom part 21 dome part 22 heel part 23 grounding part 31 connection recessed part 32 taper cylinder part 33 lower bending part 34 intermediate cylindrical part 41 large diameter part 42 small diameter part 51, 52, 53 Curled portion 101, 102, 103 Can body 111 Skirt portion 112 Sealing material 141 Cutting tip portion 142 Zenith portion 143 Inner peripheral lower bent portion 144 Inner peripheral cylindrical portion 145 Inner peripheral upper bent portion 146 Outer peripheral upper bent Part 147 outer peripheral side cylindrical part 148 outer peripheral lower side bent part 149 inner peripheral taper part 151,152 curl end part 201 cap 301 bottle container

Claims (3)

The opening has a curled portion formed by folding the cutting tip portion radially outward,
In the cross section along the can axis direction passing through the can axis, the cross-sectional area of the space portion inside the curled portion is 4 mm ² or more,
A can body characterized in that a gap is formed between the outer surface on the proximal end side of the curled portion and the cutting tip portion over the entire circumference of the curled portion.   2. The cross-section along the can axis direction passing through the can axis, wherein the radial distance of the gap is at least twice the plate thickness of the curled portion at the cutting tip. The can described in 1.   The can body according to claim 1 or 2, wherein the cutting tip is arranged downward in the can axis direction.

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