JP2017202859A - Metal tube container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal tube container which has a corner part in a shoulder part composed of a smooth curve, which makes the used amount of material small, and which reduces contents remaining in the shoulder part.SOLUTION: A shoulder part 3 of a metal tube container has a corner part 6 that is smoothly connected to a trunk part 4 in a curved line from a taper part 5. The corner part 6 comprises a main arc 7 and an auxiliary arc 8, which are formed as arcs different in curvature radius, and each of the main and auxiliary arcs comprises one or more arcs.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a metal tube container made of aluminum or the like, and more particularly to a metal tube container in which a corner portion at a shoulder portion is configured with a smooth curve.

  2. Description of the Related Art Conventionally, a metal tube container made of aluminum or the like includes a cylindrical mouth, a frustoconical shoulder continuing below the mouth, and a cylindrical trunk continuing below the shoulder. And the corner part between a shoulder part and a trunk | drum has a sharp corner | angular part. The metal tube container had no variation other than such a shape, and lacked appeal to customers and consumers.

  Therefore, an aluminum tube 101 shown in FIG. 8 (Patent Document 1) having a soft appearance by forming the corner portion 106 in a smooth arc shape has been developed. The tube 101 is formed so that the thickness of the shoulder portion 103 increases from the upper end to the lower end, and the aluminum material in the mold is smoothly washed away, and the service life of the female die and the punch is extended. is there.

No. 8-9000

However, the aluminum tube 101 shown in FIG. 8 is thicker from the upper end to the lower end by making the inner inclination angle different from the outer inclination angle in the shoulder 103, There was a problem of excessive materials. This problem becomes even more pronounced when a tube having a large arc at the corner 106 is desired. That is, the corner portion 106 shifts downward with respect to the axial center of the container as a whole when the arc becomes large. Therefore, it is necessary to make the inclination angle inside the corner portion 106 different from the outside inclination angle accordingly. is there. If it does so, since the site | part which the shoulder part 103 and the inner side of the trunk | drum 104 connect will become long in the vertical direction, it will become difficult to take out the content which remained in the shoulder part 103. FIG.
An object of the present invention is to reduce the amount of material used and the content remaining on the shoulder in a metal tube container having a corner portion in which the shoulder and the trunk are connected by a smooth curve. Moreover, it aims at producing a high quality product stably.

  In order to solve this problem, the solving means of the invention described in claim 1 includes a tapered portion extending downward and inclined from the lower end of the mouth portion, and a corner portion smoothly connected to the trunk portion from the tapered portion by a curve. The metal tube container is characterized in that the corner portion is composed of a main arc and a sub-arc formed by arcs having different radii of curvature, each of which is composed of one or more arcs. .

  According to a second aspect of the present invention, there is provided a metal tube container according to the present invention, wherein one end of the main arc is connected to the tapered portion, and the other end is connected to one end of a sub-arc having a smaller radius of curvature than the main arc. It is a metal tube container that is connected and further has the other end of the secondary arc connected to the body.

  According to a third aspect of the present invention, there is provided a metal tube container according to the present invention, wherein each of the main arc and the sub arc includes one arc.

  In order to solve this problem, the solving means of the invention described in claim 4 includes: a tapered portion extending downwardly from the lower end of the mouth portion; and a corner portion smoothly connected to the trunk portion from the tapered portion by a curve. A metal tube characterized in that a corner portion constitutes an arc group formed by a plurality of arcs, and each radius of curvature of the arc group is gradually decreased toward the outer side in the radial direction. It is a container.

  According to a fifth aspect of the present invention, there is provided a metal tube container according to the present invention, wherein the corner portion is entirely or partially formed of an elliptic curve.

  According to a sixth aspect of the present invention, there is provided a metal tube container according to the present invention, wherein a first inclined portion extending in parallel with the tapered portion from an inner lower end of the mouth portion, and the trunk portion from the first inclined portion. And an angle formed between the second inclined portion and the axis of the metal tube container is smaller than an angle formed between the first inclined portion and the axis. The metal tube container is formed such that the thickness in the axial center direction formed by the two inclined portions and the corner portion gradually increases toward the radially outer side.

  According to a seventh aspect of the present invention, there is provided a metal tube container according to the present invention, wherein the outer surface of the body portion is formed with a film made of a heat-shrinkable film.

  According to the metal tube container of the present invention, the amount of material used can be reduced, and the content remaining on the shoulder can be reduced. Moreover, high quality products can be produced stably.

It is a half sectional view of a metal tube container showing a 1st embodiment concerning this invention. It is a principal part enlarged view of FIG. It is a principal part enlarged view which shows 2nd Embodiment concerning this invention. It is a principal part enlarged view which shows 3rd Embodiment concerning this invention. It is a principal part enlarged view which shows 4th Embodiment concerning this invention. It is the schematic which shows the manufacturing apparatus of the metal tube container which concerns on this invention. It is a half sectional view showing another embodiment using a metal tube container concerning this invention. It is a half cross-sectional view showing a conventional metal tube container.

  Embodiments of the present invention will be described below with reference to the drawings.

  1 and 2 show a first embodiment of a metal tube container according to the present invention. FIG. 1 is a view showing the entire metal tube container 1, and FIG. 2 is an enlarged view of a portion A in FIG. As shown in FIGS. 1 and 2, the outer surface of the shoulder portion 3 has a tapered portion 5 extending obliquely downward from the outer lower end of the mouth portion 2 by a predetermined angle, and a body portion smoothly curved from the tapered portion 5. 4 is formed. Here, the upper and lower ends of the corner portion 6 are indicated by black circles (●) in FIG. The curve of the corner portion 6 has a convex shape toward the outside of the container 1 and has a plurality of radii of curvature. That is, the curve of the corner portion 6 is composed of a main arc 7 that is smoothly connected to the lower end of the taper portion 5 by a curve, and a secondary arc 8 that is smoothly connected to the trunk portion 4 by a curve from the lower end of the main arc 7. Consists of two arcs. Reference numerals C1 and c1 indicated by circles (◯) are the centers of the main arc 7 and the sub-arc 8 respectively. Of these, the main arc 7 is smoothly connected to the tapered portion 5, but not smoothly connected to the body portion 4. Therefore, when the corner portion 6 is formed only by the main arc 7, a sharp corner portion is formed at a portion where the main arc 7 and the body portion 4 intersect (not shown). However, this corner portion is undesirable because it causes damage to the molding die. Therefore, the sub-arc 8 eliminates the angular portion and smoothly connects the main arc 7 and the body 4. These main arcs 7 and sub-arcs 8 have different radii of curvature. Since the main arc 7 is important for forming a roundness that can be visually recognized, the radius of curvature R1 of the main arc 7 must be sufficiently larger than the radius of curvature r1 of the sub-arc 8. is there. On the other hand, the radius of curvature r1 of the secondary arc 8 is large enough to eliminate the angular portion, and is sufficiently smaller than the radius of curvature R1 of the main arc 7. In order to satisfy these conditions and maintain stable formability, the radius of curvature R1 of the main arc 7 is preferably 1.5 to 3.0 mm, and the radius of curvature of the sub-arc is within 1.0 mm or less. In particular, 0.2 to 1.0 mm is preferable. FIG. 2 shows a corner portion 6 in which the radius of curvature R1 of the main arc 7 is 2.0 mm and the radius of curvature r1 of the sub-arc 8 is 0.4 mm.

  Next, the virtual corner portion 9 indicated by a chain line in FIG. The virtual corner portion 9 has a conventional shape in which the taper portion 5 is smoothly connected to the trunk portion with one arc. Here, what is indicated by square marks (□) are the upper and lower ends of the virtual corner portion 9. In FIG. 2A, in order to compare the shapes of the corner portion 6 and the virtual corner portion 9, the radius of curvature of the arc of the virtual corner portion 9 is formed to be 2.0 mm, which is the same as the radius of curvature R1 of the main arc 7. . As shown in the drawing, the corner portion 6 according to the present invention is located above the virtual corner portion 9 with respect to the axis of the container. Further, the lower end of the corner portion 6 indicated by a black circle (●) (the lower end of the sub-arc 8 and the contact point between the sub-arc 8 and the body portion 4) is the lower end of the virtual corner portion 9 indicated by a square mark (□). Rather than the axis of the container. Furthermore, the upper end of the corner portion 6 indicated by a black circle (●) is located on the outer side in the radial direction from the upper end of the virtual corner portion 9 indicated by a square mark (□).

  Next, the inner surface shape of the shoulder 3 which is a feature of the present invention will be described. As shown in FIG. 2A, on the inner surface of the shoulder portion 3, a first inclined portion 15 extending in parallel with the tapered portion 5 from the inner lower end of the mouth portion 2, and bent downward from the first inclined portion 15. And a second inclined portion 16 connected to the inside of the body portion 4 is formed. The first inclined portion 15 and the second inclined portion 16 and the second inclined portion 16 and the trunk portion 4 may be smoothly connected with an auxiliary curve 16 ′ having a small curvature radius. In FIG. 2, the radius of curvature of the auxiliary curve 16 'is formed to be 0.5 mm. In addition, although it is preferable to form the 2nd inclination part 16 with a straight line, what was formed with the curve which has a big curvature radius is also contained in this invention. However, if the radius of curvature is small, the molding will be hindered, such as a problem that the material does not flow smoothly during impact molding and a problem that the inner surface of the shoulder 3 is damaged. Therefore, when forming the 2nd inclination part 16 with a curve, the curve of the curvature radius as close to a straight line as possible is preferable.

  FIG. 2B is a view for explaining the angles of the first inclined portion 15 and the second inclined portion 16 with respect to the axial center of the container, and the thickness of the shoulder portion. Here, chain lines o1 and o2 are straight lines parallel to the axis O of the container 1 shown in FIG. As illustrated, the angle θ1 of the first inclined portion 15 with respect to the chain line o1 (the axis of the container) and the angle θ2 of the second inclined portion 16 with respect to the chain line o2 (the axis of the container) have different angles. The angle θ2 of the second inclined portion 16 is smaller than the angle θ1 of the first inclined portion 15. In order to satisfy these conditions and maintain a stable moldability, the angle θ1 of the first inclined portion 15 is in the range of 50 ° to 70 °, particularly preferably 55 ° to 65 °, and the second inclined portion. The angle θ2 of the portion 16 is in the range of 15 ° to 35 °, and particularly preferably 20 ° to 30 °. In FIG. 2, the angle θ1 of the first inclined portion 15 and the angle of the tapered portion 5 are set to 60 °, and the angle θ2 of the second inclined portion 16 is set to 25 °. Next, the thickness of the shoulder 3 includes a first region S1 formed by the tapered portion 5 and the first inclined portion 15, and a second region S2 formed by the corner portion 6 and the second inclined portion 16. Each has a different thickness. Here, the thickness of the shoulder 3 in the present invention refers to the length in the axial direction of the container. As shown in the figure, the thickness of the first region S1 has a basic thickness T indicated by a dotted line, that is, a constant thickness. On the other hand, the gradually increasing thickness t is added to the basic thickness T of the first region S1 so that the thickness of the second region S2 gradually increases outward in the radial direction. In FIG. 2, the basic thickness T indicated by the dotted line is formed to 0.81 mm.

  In FIG. 2B, a point P indicates a starting point where the inner surface of the shoulder 3 is bent, and a point Q indicates a starting point where the outer surface of the shoulder 3 is curved. That is, the point P is the upper end position of the second inclined portion 16 or the upper end position of the auxiliary curve 16 ′ interposed between the first inclined portion 15 and the second inclined portion 16, and the point Q is the lower end of the tapered portion 5. This is the position (the upper end position of the corner portion 6). As shown in the figure, the points P and Q are located at substantially the same distance in the radial direction with respect to the axis of the container. That is, the thickness of the shoulder portion 3 has a uniform thickness in the radially inner range (first region S1) from the starting point (point Q) where the outer surface of the shoulder portion 3 is curved. The thickness is increased only in the area radially outward from (P) ((second region S2). Therefore, the shoulder 3 is made of a small amount of material, but as long as the material of the shoulder 3 is not significantly increased. In this case, the angle θ2 of the second inclined portion with respect to the axis of the container may be increased, and the point P may be placed radially inward of the point Q.

  FIG. 3 shows a second embodiment similar to the first embodiment. In this embodiment, the curve of the corner portion 26 has two main arcs 27a and 27b that are smoothly connected to the lower end of the taper portion 25 by a curve, and the secondary arc that is smoothly connected to the body portion 24 by a curve from the lower end of the main arc 27b. It is composed of three arcs composed of an arc 28. The difference from the first embodiment is that the main arc is composed of two arcs 27a and 27b. The other inner side configuration of the shoulder portion, the thickness of the shoulder portion, etc. This is the same as the embodiment. As illustrated, the curvature radii R2a and R2b of the two main arcs 27a and 27b are different. As described above, the main arc 27 may be constituted by a main arc group connected by two or more arcs. Further, the secondary arc 28 may also be constituted by a secondary arc group connected by two or more arcs (not shown). In FIG. 3, the curvature radius R2a of the main arc 27a is 2.2 mm, the curvature radius R2b of the main arc 27b is 1.7 mm, and the curvature radius of the sub-arc 28 is 0.4 mm.

  FIG. 4 also shows a third embodiment similar to the first embodiment. In this embodiment, the curve of the corner portion 36 includes a second sub-arc 38 'that is smoothly connected to the lower end of the tapered portion 35 by a curve, and a main arc 37 that is smoothly connected to the lower end of the second sub-arc 38' by a curve. And a sub-arc 38 that is smoothly connected to the body 34 in a curved line from the lower end of the main arc 37. The difference from the first embodiment is that a second sub-arc 38 'is formed between the taper portion 35 and the main arc 37, and the configuration on the inner surface side of the other shoulder portions and the thickness of the shoulder portions are different. The same is the same as in the first embodiment. The second secondary arc 38 'may be formed as long as the main arc 37 has a sufficient length. Further, the radius of curvature of the radius of curvature r3 'of the second secondary arc 38' may be the same as or different from the radius of curvature r3 of the secondary arc 38. In FIG. 4, the radius of curvature R3 of the main arc 37 is 2.1 mm, the radius of curvature r3 of the secondary arc 38 is 0.4 mm, and the radius of curvature r3 ′ of the second secondary arc 38 ′ is 1.0 mm. Show.

  In the said 1st-3rd embodiment, the corner part was comprised by about 2 or 3 circular arcs. However, a large number of arcs may be aggregated to approximate a complicated curve other than the arc. Here, the curve other than the arc means a curve that can be approximated to an ellipse, a parabola, a cycloid, or the like by an arc group in which a plurality of arcs are assembled. Such a curve is shown in FIG. 5 as a fourth embodiment. A curve of the corner portion 46 indicated by a solid line is an elliptic curve 47 having a center C4. The elliptic curve 47 can be approximated to an elliptic curve by an arc group in which a plurality of arcs are assembled. The curvature radius of the elliptic curve 47 is formed so as to gradually decrease toward the outer side in the radial direction. The difference from the first to third embodiments is that the boundary of the radius of curvature is not clear as in the relationship between the main arc and the sub-arc, and the configuration on the inner surface side of the other shoulder portions and the shoulder portions are different. About thickness etc., it is the same as the 1st-3rd embodiment. On the other hand, the chain line shown in FIG. 5A is a virtual corner portion 49 that is smoothly connected to both the taper portion and the trunk portion by one arc as in FIGS. In order to compare the shapes of the corner portions 49, the radius of curvature is formed to be 2.0 mm as in FIGS. As illustrated, the corner portion 46 is located above the virtual corner portion 49 with respect to the axis of the container. Further, the lower end of the corner portion 46 (elliptic curve 47) indicated by a black circle mark (●) is located above the lower end of the virtual corner portion 49 indicated by a square mark (□) with respect to the axis of the container. Furthermore, the upper end of the corner portion 46 (elliptic curve 47) indicated by a black circle mark (●) is located on the radially outer side than the upper end of the virtual corner portion 49 indicated by a square mark (□). In this embodiment, the corner portion 46 is composed only of the elliptic curve 47, but one or a portion between the elliptic curve 47 and the taper portion 45 and / or between the elliptic curve 47 and the trunk portion 44. Further arcs may be formed. And when such an arc is comprised by the arc group which aggregated many arcs, you may comprise by curves other than an elliptic curve.

  The curve of the corner portion shown in the first to fourth embodiments has been described with respect to only an arc or a group of arcs obtained by approximating a curve with a plurality of arcs. Those approximated to are also included in the present invention.

  Here, the preferable dimension of the metal tube container shown to the said 1st-4th embodiment is demonstrated. In the metal tube container according to the present invention, particularly in the following range, damage to the molding die can be suppressed, and a high quality product can be stably produced. Also, no special manufacturing method or means is required. First, the preferable thickness of the shoulder, that is, the thickness (basic thickness T) in the axial direction of the container formed by the tapered portion (5, 25, 35, 45) and the first inclined portion 15 is 0. .4 to 1.0 mm. Next, the preferable thickness of the trunk portion (4, 24, 34, 44), that is, the thickness in the radial direction of the trunk portion is 0.10 to 0.13 mm. When the corner portion is composed of two or three arcs, that is, a main arc and a sub-arc, the curvature radius of the main arc (7, 27a, 27b, 37) is preferably 1.5 to 3.0 mm. The curvature radius of the sub-arcs (8, 28, 38, 38 ′) is 1.0 mm or less, particularly preferably 0.2 to 1.0 mm. As shown in FIG. 5, when the corner portion 46 is a curve other than an arc and is a curve approximated by an arc group in which a plurality of arcs are assembled, for example, an elliptic curve 47, each curvature radius of the arc group is The following should be determined. That is, the virtual arc 49 shown in FIG. 5 is drawn within the preferable range of the main arc (1.5 to 3.0 mm), and the curve is formed so that the arc group is positioned above the virtual arc 49 in the axial direction. Set. An angle θ1 formed by the first inclined portion 15 and the axis O (chain line o1) of the container with respect to the corner portions (6, 26, 36, 46) is in a range of 50 ° to 70 °, In particular, 55 ° to 65 ° is preferable. And angle (theta) 2 which the 2nd inclination part 16 and the axis O (chain line o2) of a container make is the range of 15 degrees-35 degrees, and 20 degrees-30 degrees are especially preferable.

  Next, the manufacturing method of the metal tube container based on this invention is demonstrated. FIG. 6 is a schematic view showing the impact molding apparatus 51. The impact molding is a method in which a punch 53 is advanced in the direction of an arrow and an impact force is applied to a slag material M such as aluminum placed in a recess of a die 52 to form a desired shape. That is, the slag material M flows through the gap formed by the die 52, the punch 53, and the ejector pin 54, and extends along the side wall of the punch 53, whereby the mouth portion 2, the shoulder portion 3, and the trunk portion shown in FIG. The metal tube container 1 with which 4 is integrated is manufactured. In addition, what is necessary is just to change suitably the shape of the shoulder part 52a of the dice | dies 52 and the corner part 52b, and the shape of the shoulder part 53a of the punch 53 in order to form the shoulder part 3 in the shape of the said embodiment.

  Returning to FIG. 1, the vicinity of the upper end of the mouth part 2 of the metal tube container 1 may be closed with a pierceable or peelable thin film 2a, which is formed integrally with the mouth part by impact molding. Also good. Further, a lid engaging portion 2b such as a screw portion may be formed so that a cap (not shown) can be attached to and detached from the mouth portion 2. The lid engaging portion 2b may be composed of a separate member to be described later.

  The metal tube container thus obtained may have a synthetic resin film 71 formed on the outer surface thereof as shown in FIG. FIG. 7 shows a fifth embodiment in which a heat-shrinkable film 71 ′ is coated as the synthetic resin film 71. The heat-shrinkable film 71 'is made of a heat-shrinkable film such as polyester or polyethylene. The film formed in a cylindrical shape may be covered with a heat-shrinkable coating 71 ′ from the upper end of the shoulder portion 63 to the body portion 64 of the metal tube container 61 by heat-shrinking as shown in the figure. This film may be preliminarily decorated such as printing. Further, a separate inner plug 72 having a lid engaging portion 72b such as a screw portion may be provided on the outer periphery of the mouth portion 62. The inner plug 72 is obtained by injection molding of a synthetic resin. The contents are filled into the metal tube container 61 thus obtained. Thereafter, the lower end of the body part 64 is flattened and folded to form a fastening part 64a, whereby the metal tube container 61 containing the contents in the container is completed. In FIG. 7, the fastening portion 64 a is not covered with the heat-shrinkable coating 71 ′, but may be covered with the heat-shrinkable coating 71 ′ to the lower end of the body portion 64.

Next, the effect of the said embodiment is demonstrated. In the first to third embodiments, the corner portion is composed of a main arc and a sub-arc having different radii of curvature, and in the fourth embodiment, the corner portion is composed of a plurality of arcs. A group is formed, and each radius of curvature of the arc group is configured by an arc that gradually decreases outward in the radial direction. Since the corner portion is configured in this way, the corner portion is shifted upward with respect to the axis of the container rather than forming the corner portion with a single arc having a relatively large radius of curvature. Therefore, the shoulder can be formed with a small amount of material. In particular, when a first inclined portion parallel to the tapered portion and a second inclined portion bent from the first inclined portion and connected to the inside of the trunk portion are formed inside the shoulder portion, the corner portion and Since only the thickness in the axial direction formed by the second inclined portion gradually increases toward the outside in the radial direction, the shoulder portion can be formed with a smaller amount of material. Further, the thickness of the shoulder portion in the axial direction formed by the corner portion and the second inclined portion gradually increases toward the outer side in the radial direction, and the inner side of the shoulder portion is formed substantially linearly. Thus, during impact molding, the slag material flows smoothly toward the body portion, and molding defects do not occur.
In the fifth embodiment, the outer surface of the metal tube container according to the first to fourth embodiments is covered with a synthetic resin coating, for example, a heat shrinkable film. Therefore, the metal texture can be suppressed. In particular, when a heat-shrinkable film is covered from the upper end of the shoulder of the container to the body, and an inner plug of synthetic resin is provided on the outer periphery of the mouth, the metal surface is hardly exposed, thereby further suppressing the metal texture. Can do. Further, since the radius of curvature of the corner portion is relatively large, the film is not easily torn near the corner portion when the heat-shrinkable film is heat-shrinked to cover the body portion and the shoulder portion, or when the tube container is squeezed out.

  The embodiment of the present invention has been described above. However, the present invention is not limited to the above embodiment, and it is needless to say that various forms (not shown) described below can be adopted. For example, the synthetic resin film 71 by the heat-shrinkable film 71 ′ shown in FIG. 7 may be replaced with a synthetic resin film by a heat-sensitive adhesive film or label. The synthetic resin film 71 may be replaced with a synthetic resin film made of a thermoplastic resin or a thermosetting resin coating film. In the synthetic resin film by this coating film, a coating film of a thermoplastic resin or a thermosetting resin is formed on the outer surface of the body portion of the metal tube container by a coating method such as roll coating or spray coating. Moreover, you may form the synthetic resin film by this coating film also on the outer surface of a shoulder part or a mouth part as needed. As another synthetic resin film, the synthetic resin film may be formed by forming a thermoplastic resin layer on the outer surface of the metal tube container by injection molding, extrusion molding or the like. Furthermore, the metal tube container may be provided with a protective film on the inner surface for stably storing the contents. The protective coating is formed by coating a thermoplastic resin or thermosetting resin on the inner surface of the metal tube container by a coating method such as spray coating.

1, 61, 101 Metal tube container 2, 62, 102 Mouth portion 2a Thin film 2b, 72b Lid engaging portion 3, 23, 33, 43, 63, 103 Shoulder portion 4, 24, 34, 44, 64, 104 Body 5, 25, 35, 45 Tapered part 6, 26, 36, 46 Corner part 7, 27a, 27b, 37 Main arc 47 Elliptic curve 8, 28, 38 Sub arc 38 'Second sub arc 9, 29, 39, 49 Virtual corner portion 15 First inclined portion 16 Second inclined portion 16 ′ Auxiliary curve 51 Impact molding device 52 Die 52a Shoulder portion 52b Corner portion 53 Punch 53a Shoulder portion 54 Ejector pin M Slag material 64a Folding portion 71 Synthetic resin coating 71 ′ Heat-shrinkable coating 72

Claims (7)

In a metal tube container having a tapered portion extending inclined downward from the lower end of the mouth portion, and a corner portion smoothly connected to the trunk portion by a curve from the tapered portion,
The said corner part consists of a main arc and a subarc formed with the circular arc from which a curvature radius differs, and each is comprised by one or more circular arcs, The metal tube container characterized by the above-mentioned.   One end of the main arc is connected to the tapered portion, the other end is connected to one end of a subarc smaller than the radius of curvature of the main arc, and the other end of the subarc is connected to the body portion The metal tube container according to claim 1.   3. The metal tube container according to claim 1, wherein each of the main arc and the sub arc is constituted by one arc. In a metal tube container having a tapered portion extending inclined downward from the lower end of the mouth portion, and a corner portion smoothly connected to the trunk portion by a curve from the tapered portion,
A metal tube container, wherein a corner portion constitutes an arc group formed of a plurality of arcs, and each radius of curvature of the arc group is gradually decreased toward the outer side in the radial direction.   The metal tube container according to claim 4, wherein all or part of the corner portion is configured by an elliptic curve. A first inclined portion extending in parallel with the tapered portion from an inner lower end of the mouth portion, and a second inclined portion connected from the first inclined portion to the inside of the trunk portion,
The angle formed by the second inclined portion and the axis of the metal tube container is smaller than the angle formed by the first inclined portion and the axis, and the axis formed by the second inclined portion and the corner portion. The metal tube container according to any one of claims 1 to 5, wherein a thickness in a central direction is gradually increased toward a radially outer side.   The metal tube container of Claims 1-6 which formed the film which consists of a heat-shrinkable film in the outer surface of the said trunk | drum.

Images