JP2022177092A - Bottle can body, bottle can body with cap, capping method for bottle can body - Google Patents

Abstract

An object of the present invention is to provide a bottle can body to which an easy-to-open cap with excellent sealing performance can be attached without deforming the curled part. [Solution] A body portion formed in a cylindrical shape centered on a can axis, a bottom portion closing one end of the body portion, and a shoulder portion 23 extending in a diameter-reducing manner from the other end of the body portion. , a metal bottle can body 11 having a cap part 24 extending from the shoulder part 23 toward an opening at the other end, the cap part 24 having the other end wound outward. It includes a curled part 31, a neck part 32 connected to the shoulder part 23, and a connecting part 33 extending to connect between the curled part 31 and the neck part 32. The cap 12 that closes the opening of the base portion 24 includes a cap locking portion 34 that engages with a seaming portion 44 formed at the edge of a cylindrical extension portion 43 that extends to cover the connection portion 33. It will be done. [Selection diagram] Figure 3

Description

TECHNICAL FIELD The present invention relates to a bottle can body, a bottle can body with a cap, and a capping method for the bottle can body.

2. Description of the Related Art A bottle can having a can body (wall), a can bottom (bottom), and a shoulder portion with a reduced diameter on the opening side is known as a can body to be filled and sealed with a content such as a beverage. At the tip of the shoulder portion of such a bottle can body, a mouthpiece portion is formed for attaching a cap that closes the opening. As a cap for plugging a bottle can body, a screw cap that is screwed into a screw groove formed in a mouthpiece is known (see, for example, Patent Document 1).

However, when opening the screw cap type bottle can body, it is necessary to rotate the screw cap so as to break a cut portion called a bridge formed at the edge of the screw cap. Such a pivoting motion may not be preferred and a non-threaded bottle may be desired.

On the other hand, a pull-tab type cap (easy-to-open cap) is known as an easy-to-open bottle can cap (see, for example, Patent Document 2). This pull-tab type cap forms a curled portion by curling the end of the mouthpiece of the bottle can body outward, and bends the edge of the cap so as to wind around the curved surface of this curled portion, thereby pulling the bottle. It is attached to the mouthpiece of the can body.
When opening the cap, the cap can be easily opened by simply pulling up the pull-tab so as to cut off the edge of the cap that is engaged with the bottle can body.

Japanese Patent No. 4908544 Japanese Patent No. 5323757

In the bottle can body corresponding to the pull-tab type cap shown in Patent Document 2, the edge of the cap is wound around the curled portion that forms the opening of the bottle can body and locked. should be large enough to wrap around. However, increasing the winding diameter of the curled portion reduces the strength of the curled portion. Therefore, there is a concern that the curled portion may be deformed due to the stress when the edge of the cap is wound. In addition, if the curled portion is enlarged, it is difficult to narrow the outer periphery of the cap, so there is also a concern that when a thin-walled bottle can is plugged, the sealing performance will be deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the circumstances described above. An object of the present invention is to provide a bottle can body with a cap and a capping method for the bottle can body.

In order to solve the above-mentioned problems, the bottle can body of the present invention comprises: a barrel formed in a cylindrical shape centering on the can axis; a bottom portion closing one end of the barrel; a metal bottle can body having a shoulder portion extending from one end of the bottle so as to reduce the diameter of the a curled portion formed by winding the other end of the base portion outward; a neck portion connected to the shoulder portion; and a connecting portion extending to connect the curled portion and the neck portion. The connecting portion has a perfect circular cross section perpendicular to the can axis at any position between the neck portion side and the curl portion side. a cap locking portion that engages with a seam tightening portion formed on an edge portion of a cylindrical extension extending to cover the connecting portion in a cap that closes the opening of the mouthpiece; A cylindrical portion forming a peripheral surface parallel to the can axis is provided closer to the curl portion than the curl portion, the lower end of the cylindrical portion is connected to the cap locking portion, and the cylindrical portion is connected to the mouthpiece. It is characterized by being a part having the maximum diameter in .

According to the bottle can body of the present invention, the forming position of the seam portion for engaging the cap with the bottle can body is set to be different from the curled portion separated from the curled portion of the bottle can body via the connecting portion. Since it is not necessary to wind and engage the edge of the cap around the curled portion, it is possible to reduce the winding diameter of the curled portion.

Therefore, by reducing the winding diameter of the curled portion in this way, the strength of the curled portion can be increased. It never collapses. Therefore, the tightness between the inner surface of the cap and the curled portion can be enhanced by narrowing the outer periphery of the cap, and the liquid contained in the bottle body can be reliably sealed.

Here, the cap engaging portion may be a stepped portion formed by widening the neck portion side of the connection portion outward toward the curl portion side. Furthermore, the curled portion may have a flat portion parallel to the can axis.

Further, the connecting portion may include a tapered portion closer to the curled portion than the cap engaging portion and having a diameter reduced toward the curled portion. As described above, when the tapered portion is provided by forming the seam-fastening portion that engages the cap with the bottle can body at the cap engagement portion that is different from the curled portion of the bottle can body, The inclination angle of the tapered portion with respect to the can axis can be reduced, that is, the tapered portion can be made more parallel to the can axis. As a result, compared to, for example, screw-cap type bottle cans, etc., the strength of the tapered portion in the direction along the can axis is increased, so that when the mouthpiece is molded, the mouthpiece sits along the can axis. It is possible to prevent troubles such as bending. In addition, it is desirable that the tapered portion is inclined at an inclination angle in the range of 30° to 50° with respect to the can axis.

Further, the connection portion may include a cylindrical portion centered on the can axis on the curl portion side of the cap engaging portion. By forming such a cylindrical portion, when internal pressure is applied to the inside of the bottle can body as a bottle can body with a cap, the vicinity of the top surface of the cap that is deformed by the internal pressure engages with the cap engaging portion. Since the seam portion can be separated, the pressure resistance strength can be effectively increased. Further, it is also possible to prevent buckling of the mouthpiece by setting the inclination angle of the cylindrical portion of the connecting portion to 0° with respect to the can axis.
Furthermore, the length of the cylindrical portion along the can axis may be 1/2 or more of the length of the connecting portion along the can axis.

Furthermore, when such a cylindrical portion is provided in the connecting portion, the cylindrical portion has an annular groove around the can axis into which the extension portion of the cap covering the connecting portion is partially fitted. You may form so that it may go around and be connected. By partially fitting the extended portion of the cap into such an annular groove, the cap is strongly engaged with the mouthpiece portion together with the seaming portion that engages with the cap engaging portion, thereby providing a capped bottle can body. It is possible to further increase the pressure resistance strength of the cap and the mounting strength of the cap.

Further, the capped bottle can body of the present invention includes the bottle can body as described above, and the cap in which the seaming portion is engaged with the cap locking portion to close the opening of the mouthpiece portion. It is characterized by

In particular, the connecting portion of the bottle can body has a cylindrical portion centered on the can axis, and an annular groove in which an extension portion covering the connecting portion of the cap is partially fitted in the cylindrical portion, In the case where it is formed so as to circulate and connect around the can shaft, the seam tightening portion is engaged with the cap engaging portion and the extension portion is partially fitted into the annular groove to form the cap engaging portion. By providing the cap that closes the opening of the mouthpiece, it is possible to further increase the pressure resistance strength of the capped bottle can body and the mounting strength of the cap as described above. In order to ensure the sealing performance of the bottle can body, it is desirable that a cap liner is sandwiched between the inner surface of the cap and the curled portion.

Further, a capping method for a bottle can according to the present invention is a method for capping a bottle can by attaching a cap to a bottle can as described above, in which a pressure block is used to apply a load toward the top surface of the cap. At the same time, the edge portion of the top surface is drawn using a drawing die, and the edge portion of the cap is wound using a forming roller to form a tightening portion, which is engaged with the cap engaging portion. It is characterized by

According to such a capping method for bottle cans, for example, a capping roller (bottom winding roller) of a capping device used for manufacturing screw-capped bottle cans is used as the forming roller to form a cap on a bottle can. A seam-fastening portion that engages with the body is formed in the cap engaging portion below the curl portion, and the bottle can body can be capped with the cap.

Furthermore, in such a capping method as well, the connecting portion of the bottle can body has a cylindrical portion centered on the can axis, and the cylindrical portion includes an extension portion covering the connecting portion of the cap. In the case where the annular groove to be fitted in is formed so as to be connected around the can axis, a drawing die is used while applying a load toward the top surface of the cap using a pressure block. The edge of the top surface is drawn and formed by drawing, and a forming roller is used to form a winding portion by winding and tightening the edge of the cap to be locked to the cap locking portion, and a grooved roller is used. The extension of the cap may be partially fitted into the annular groove by using a tool.

According to such a capping method, for example, a winding roller (bottom winding roller) of a capping device used for manufacturing a capped bottle can body of a screw cap type is used as the forming roller, and a threading roller is used as the grooving roller. , the cap is engaged with the cap engaging portion and the annular groove to further improve the pressure resistance strength of the capped bottle can body and the mounting strength of the cap.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, a bottle can body and a capped bottle can body to which an easy-to-open cap having excellent sealing performance can be attached without deforming the curled portion forming the opening of the bottle can body. A body and a method of capping a bottle can body can be provided.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is an external perspective view showing a bottle can body with a cap according to a first embodiment of the present invention; FIG. 2 is a cross-sectional view along the can axis of the bottle can body of the embodiment shown in FIG. 1; Fig. 2 is an enlarged cross-sectional view of the periphery of the mouthpiece portion of the capped bottle can body of the embodiment shown in Fig. 1; FIG. 3 is a cross-sectional view showing an example of a capping device that engages a cap with the bottle can body of the embodiment shown in FIG. 2 ; Fig. 10 is a side view of a bottle can body according to a second embodiment of the present invention; Fig. 6 is an enlarged cross-sectional view of the vicinity of the mouthpiece of the capped bottle can body of the third embodiment of the present invention, in which a cap is attached to the mouthpiece part of the bottle can body of the embodiment shown in Fig. 5 ; Fig. 10 is a side view of a bottle can body according to a third embodiment of the present invention; FIG. 8 is an enlarged cross-sectional view of the vicinity of the mouthpiece of the capped bottle can body of the fourth embodiment of the present invention in which a cap is attached to the mouthpiece part of the bottle can body of the embodiment shown in FIG. 7 ; FIG. 8 is a cross-sectional view showing an example of a capping device that engages a cap with the bottle can body of the embodiment shown in FIG. 7;

Hereinafter, a bottle can body, a bottle can body with a cap, and a capping method for a bottle can body according to an embodiment of the present invention will be described with reference to the drawings. It should be noted that each embodiment shown below is specifically described for better understanding of the gist of the invention, and does not limit the invention unless otherwise specified. In addition, in the drawings used in the following description, in order to make it easier to understand the features of the present invention, there are cases where the main parts are enlarged for convenience, and the dimensional ratio of each component is the same as the actual one. not necessarily.

(Bottle can body, bottle can body with cap: first embodiment)
FIG. 1 is an external perspective view showing a bottle can body with a cap according to the first embodiment. Moreover, FIG. 2 is sectional drawing along the can axis of the bottle can body of 1st Embodiment.
The capped bottle can body 10 of the first embodiment is composed of the bottle can body 11 of the first embodiment and a pull-tab type cap 12 capable of plugging the opening P of the bottle can body 11 .

The bottle can body 11 is entirely made of a metal such as an aluminum alloy, and has a cylindrical body 21 with a circular cross section centered on the can axis O and one end (lower end) of the body 21. , a shoulder portion 23 extending so as to reduce the diameter from the other end (upper end) of the body portion 21, and from the shoulder portion 23 toward the opening P at the other end of the bottle can body 11 and a base portion 24 extending along the length of the base.

The body portion 21, the bottom portion 22, the shoulder portion 23, and the mouthpiece portion 24 are integrally formed from one aluminum alloy plate material in this embodiment. For example, an aluminum alloy plate material with a thickness of 0.270 mm to 0.370 mm is cupped by a cupping press and then drawn and ironed (DI processing) to form a bottomed cylindrical body with a body portion 21 and a bottom portion 22. A (DI can) is formed, and then the shoulder portion 23 and mouth portion 24 are formed by a necking machine equipped with a die working tool (neck forming mold).

The bottom portion 22 has an outer peripheral portion whose diameter is reduced downward as it goes toward the inner peripheral side, and a bottom surface 22a of the inner peripheral portion is curved toward the inside of the bottle can body 11 in a dome shape. In addition, the shoulder portion 23 is connected to the other end of the body portion 21, and is centered on the can axis O whose diameter is continuously reduced toward the other end of the bottle can body 11 along the can axis O. It has a truncated cone shape and is formed in a constricted shape that slopes smoothly.

FIG. 3 is an enlarged cross-sectional view of the vicinity of the mouthpiece 24 of the capped bottle can body 10 of the first embodiment.
The base portion 24 is a portion connected to the other end portion of the shoulder portion 23, and is engaged with a pull-tab type cap 12, which will be described later. The mouthpiece portion 24 is composed of a curl portion 31 formed by winding the other end of the mouthpiece portion 24 outward by curling, and a shoulder portion 23 connected to a straight shape parallel to the can axis O (the can axis O). and a connecting portion 33 extending to connect between the curled portion 31 and the neck portion 32 . The connection portion 33 is formed by winding the lower edge portion of an extension portion 43 extending to cover the connection portion 33 in the cap 12 that closes the opening P of the mouthpiece 24 on the neck portion 32 side. It has a cap lock 34 that engages with 44 .

A straight neck portion 32 parallel to the can axis O is connected at one end to the shoulder portion 23 and has a diameter φ1 (see FIG. 2) of about 25.0 mm to 40.0 mm, for example, along the can axis O. It has a cylindrical shape with a length L1 of, for example, about 5.0 mm to 50.0 mm.
Note that the neck portion 32 may have a tapered shape that is inclined from 0° to 10° in the vertical direction. Further, the taper is not limited to a linear taper, and may be a tapered shape in which a curve or a combination of a curve and a straight line is used.

The curled portion 31 has a lateral radius (winding diameter) φ2 perpendicular to the can axis O of about 1.0 mm to 3.0 mm, and a longitudinal radius (winding diameter) φ3 parallel to the can axis O of about 1.0 mm. It forms a substantially oval shape of about 5 mm to 5.0 mm. Also, the radius of curvature r1 of the upper end of the curled portion 31 is about 0.2 mm to 0.8 mm.
A flat portion 31f parallel to the can axis O is formed on the outer peripheral portion of the curled portion 31 by throttle processing. A length L2 of the flat portion 31f parallel to the can axis O is, for example, about 1.0 mm to 3.5 mm.

Further, the connecting portion 33 has a tapered portion 33a closer to the curl portion 31 than the cap locking portion 34. In the first embodiment, the connecting portion 33 has a tapered portion 33a whose diameter decreases from the cap locking portion 34 side toward the curl portion 31 side. .
The tapered portion 33a is inclined outward toward the cap engaging portion 34 at a constant angle θ of 30° to 50° with respect to the can axis O. As shown in FIG. It is more preferable that the inclination angle θ of the tapered portion 33a is in the range of 43° to 48°. A length L3 of the tapered portion 33a from the lower end of the curled portion 31 in the direction along the can axis O is, for example, about 2.0 mm to 10.0 mm.

The cap engaging portion 34 of the first embodiment includes a stepped portion 35 formed by widening the end portion of the connecting portion 33 on the neck portion 32 side toward the curl portion 31 side.
The stepped portion 35 is formed such that the width W1 in the lateral direction perpendicular to the can axis O is, for example, about 1.5 mm to 3.5 mm. The stepped portion 35 is tapered slightly toward the curl portion 31 side (upper end portion side) from the end portion of the neck portion 32 toward the end portion of the tapered portion 33a.
The lower edge of the cylindrical extension portion 43 of the cap 12 is seamed along the stepped portion 35 (cap locking portion 34) having such a shape to form a seamed portion 44. As shown in FIG.

The cap 12 plugs the opening P of the cap portion 24 of the bottle can body 11, and is entirely made of metal such as an aluminum alloy.
The cap 12 includes a disk-shaped top surface 41 that covers the opening P of the mouthpiece 24, a bent portion 42 that extends from the outer edge of the top surface 41 and bends in contact with the curl portion 31, and a connecting portion 33 (tapered portion 33a). ) and a cylindrical extension 43 extending downward (to the side of the cap engaging portion 34) in parallel with the can axis O so as to cover the outside of the can, and a seamed portion 44 formed by seaming the lower edge of the extended portion 43. . Between the top surface 41 of the cap 12 and the bent portion 42, a stepped portion 45 having a step along the direction of the can axis O is formed by narrowing the outer periphery of the top surface 41 of the cap 12. As shown in FIG.

The plate thickness t of the cap 12 is, for example, about 0.22 mm to 0.30 mm. The length (height) h between the top surface 41 of the cap 12 and the seam portion 44 is, for example, about 3.5 mm to 15.0 mm, or about 10.0 mm to 18.0 mm.
Furthermore, the seamed portion 44 of the cap 12 is formed when the opening portion P of the bottle can body 11 is plugged, and the cap 12 before forming the seamed portion 44 is placed over the mouthpiece portion 24 of the bottle can body 11. After that, a capping device is used to wind the lower edge of the extension 43 of the cap 12 along the stepped portion 35 (cap engaging portion 34). A method of capping the bottle can body will be described later.

A pull tab 46 (see FIG. 1) is formed in a portion of the cap 12 in the circumferential direction so as to protrude downward from the seamed portion 44 . By pulling up the ring portion 46a, the pull tab 46 cuts open part of the seam tightening portion 44 to release the engagement between the seam tightening portion 44 and the cap locking portion 34, and further extends from the extension portion 43 to the bent portion 42. In this way, the cap 12 is broken, so that the cap 12 can be removed from the mouthpiece 24 to expose the opening P. As shown in FIG. Such a pull tab 46 is formed by forming a pair of linear grooves 46b, 46b in the seam portion 44 and the extension portion 43 connected to the pull tab 46, and thinning this portion, so that a predetermined thickness is formed along these grooves 46b, 46b. A portion of the seam tightening portion 44 and the extension portion 43 is cut open in width.

Furthermore, a cap liner 47 is sandwiched between the inner surface of the top surface 41 of the cap 12 and the curled portion 31 . The cap liner 47 is a packing that maintains liquid-tightness between the mouthpiece 24 and the cap 12 around the opening P. As shown in FIG. The cap liner 47 is made of, for example, a resin sheet. Such a cap liner 47 is disposed on the inner surface of the cap 12 before capping, which will be described later, or is adhered by heat sealing or adhesive, and is pressure-bonded by capping. 45 and the flat portion 31 f of the curl portion 31 .

According to the bottle can body 11 and the capped bottle can body 10 configured as described above, the forming position of the seam portion 44 that engages the cap 12 with the bottle can body 11 is set from the curl portion 31 of the bottle can body 11. By providing a stepped portion 35 (cap engaging portion 34) separate from the curled portion 31 separated via the connecting portion 33, it is not necessary to wrap the edge of the cap 12 around the curled portion 31 to engage it. The winding diameter of the curled portion 31 can be reduced.

By reducing the winding diameter of the curled portion 31 in this way, the strength of the curled portion 31 can be increased. The portion 31 is neither deformed nor crushed. Therefore, the outer periphery of the cap 12 can be squeezed with a predetermined load to increase the adhesion between the inner surface of the cap 12, the cap liner 47, and the curled portion 31, and the liquid contained in the bottle can body 11 can be reliably sealed. it becomes possible to

Further, when the connecting portion 33 has a tapered portion 33a whose diameter is reduced from the side of the cap engaging portion 34 toward the side of the curl portion 31 as in the present embodiment, the cap 12 is engaged with the bottle can body 11 in this way. By forming the seam portion 44 at a step portion 35 (cap engaging portion 34) separate from the curl portion 31 of the bottle can body 11, the inclination angle of the taper portion 33a with respect to the can axis O is reduced. , that is, it can be brought closer to parallel to the can axis O. As a result, the strength of the tapered portion 33a in the direction along the can axis O is increased compared to, for example, a screw-cap type bottle can. It is possible to prevent troubles such as buckling along.

When the connecting portion 33 has the tapered portion 33a, the tapered portion 33a is inclined at an angle θ of 30° to 50° with respect to the can axis O as in the present embodiment. It is desirable to be If the inclination angle θ exceeds 50°, buckling may occur during molding of the mouthpiece 24. If the inclination angle θ is less than 30°, the length L3 of the tapered portion 33a along the can axis O is lengthened. Accordingly, the length (height) h of the cap 12 must be increased, which is uneconomical.

Further, in the present embodiment, the cap locking portion 34 is formed by a stepped portion 35 formed by widening the neck portion 32 side of the connection portion 33 toward the curl portion 31 side. can be securely wound and engaged with the cap engaging portion 34 (stepped portion 35), and the cap 12 can be stably attached to the base portion 24.

As in the present embodiment, the stepped portion 35 has a tapered shape that is slightly inclined toward the other end (upper end) of the bottle can body 11 as it goes from the end of the neck portion 32 to the end of the connection portion 33 . , the inclination angle α (see FIG. 3) with respect to the direction perpendicular to the can axis is preferably in the range of 35° to 55°. If the inclination angle α is larger than this, it may become difficult to ensure sufficient mounting strength and pressure resistance strength for the cap 12. On the other hand, if the inclination angle α is smaller than this, the bottle can body 11 will not be formed. It may become difficult and cracks may occur.

Further, in the bottle can body 11 of the present embodiment, the curled portion 31 of the mouthpiece 24 has a flat portion 31f parallel to the can axis O, and the flat portion 31f and the flat portion 31f are formed when the stepped portion 45 is formed on the cap 12. By sandwiching the cap liner 47 between the stepped portion 45 and the cap liner 47, it becomes easier to ensure the sealing performance. In particular, in a positive pressure can in which internal pressure is applied to the inside of the bottle can body 11, the cap liner 47 sandwiched between the flat portion 31f and the stepped portion 45 reliably secures sealing performance even when the internal pressure increases. be able to.

(Bottle can body capping method: first embodiment)
Next, a first embodiment of a method for capping a bottle-can body in which a cap is engaged with a bottle-can body according to the present invention will be described.
FIG. 4 is a cross-sectional view showing an example of a capping device that engages a cap with a bottle can body.
When capping the bottle can body 11 of the first embodiment shown in FIGS. 1 to 3 by seaming the cap 12, for example, a capping device 60 shown in FIG. 4 is used. This capping device 60 includes a pressure block 61 for pressing downward the top surface 41 of the cap 12 placed on the bottle can body 11, and a pressure block 61 formed around the pressure block 61 to squeeze the outer periphery of the top surface 41 of the cap 12. A drawing die 62 that forms the stepped portion 45 and a tightening roller (forming roller) 63 that tightens the edge of the cap 12 to form the tightened portion 44 at the cap engaging portion 34 (stepped portion 35). I have.

The pressure block 61 has a pressing body 65 that presses the top surface 41 of the cap 12 and is connected to a pressure shaft 67 via an urging spring 66. When the cap 12 is attached, the pressure block 61 covers the mouthpiece 24. The pressing load that presses the top face 41 of 12 can be changed according to the diameter of the mouthpiece 24 .
The seaming roller 63 is rotatably supported by a support arm 68 and can revolve around the can axis O around the bottle can body 11 and the cap 12 .

When the cap 12 is engaged (capped) with the bottle can body 11 using such a capping device 60, first, the cap liner 47 is provided on the inner surface of the mouthpiece portion 24 of the bottle can body 11 in advance. The affixed cap 12 (cup-shaped cap material before formation of the seam portion 44) is covered.

Then, while applying a predetermined load to the top surface 41 of the cap 12 using the pressure block 61 , the edge of the top surface 41 is drawn by the drawing die 62 to form the stepped portion 45 . At the same time, the winding roller (forming roller) 63 is rotated to rotate around the can axis O along the periphery of the lower edge of the extended portion 43 of the cap 12 and to approach and contact the lower edge.

As a result, the lower edge of the extended portion 43 of the cap 12 is bent inward along the cap locking portion 34 (stepped portion 35) of the mouthpiece portion 24 of the bottle can body 11 to form a seamed portion 44. Through the above steps, the cap 12 is seamed around the mouthpiece portion 24, and the capped bottle can body 10 in which the bottle can body 11 is plugged with the cap 12 can be obtained.

According to the method for capping the bottle can body as described above, the seam portion 44 for engaging the cap 12 with the bottle can body 11 is positioned at the stepped portion 35 (cap engaging portion 34) below the curl portion 31. Once formed, the bottle can body 11 can be capped with the cap 12 .

In the method for capping the bottle can body 11 of the present embodiment, capping can be performed by a capping device used for capping a bottle can body with a screw-type cap without using a threading roller for forming threads. , it can be easily applied to the manufacturing process of bottle can bodies with screw-type caps provided with such a capping device, and is efficient. The method for capping a bottle-shaped can according to the first embodiment can also be applied to capping a bottle-shaped can according to a second embodiment described below.

(Bottle Can Body, Bottle Can Body with Cap: Second Embodiment)
FIG. 5 is a side view of a bottle can body according to a second embodiment of the present invention, and FIG. 6 is an enlarged cross-sectional view of the periphery of the capped bottle can body according to the second embodiment of the present invention.
In this second embodiment and a fourth embodiment, which will be described later, the same parts as in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted. In addition, in the drawings of these second and third embodiments, the reference numerals for the dimensions and inclination angles shown in FIGS. 2 and 3 are also omitted, but the numerical ranges of the first embodiment apply if there is no explanation. be done.
In the capped bottle can body 70 and the bottle can body 71 of the second embodiment, the connecting portion 33 is provided with a cylindrical portion 72 centered on the can axis O on the curl portion 31 side of the cap engaging portion 34. It is characterized by

The cylindrical portion 72 has a length L4 of, for example, 5.0 mm to 15.0 mm in the direction along the can axis O, and has a constant inner and outer diameter within the range of this length L4. , occupies most of the length of the connecting portion 33 or more. In the second embodiment, the length from the opening P of the mouthpiece 24 to the intersection ridge between the cap engaging portion 34 and the neck portion 32 is also longer than in the first embodiment. The length (height) h of the cap 12 is increased to about 10.0 mm to 18.0 mm as described above. Further, in the present embodiment, a tapered portion 33a is formed between the cylindrical portion 72 and the curled portion 31 so that the diameter of the tapered portion 33a decreases toward the curled portion 31 side. It is tapered in a plurality of steps (two steps in this embodiment) in which the inclination angle θ with respect to the can axis O increases stepwise.

In the bottle can body 71 and the capped bottle can body 70 of the second embodiment, deformation and crushing are prevented by reducing the winding diameter of the curled portion 31 to increase the strength, as in the first embodiment. Especially in the case of a positive pressure can in which the bottle can body 71 with the cap is pressurized inside the bottle can body 71 with the cap, the vicinity of the top surface 41 of the cap 12 deformed by the internal pressure and the cap engaging portion 34 Since it is possible to separate the seam portion 44 that engages with (the stepped portion 35) and secure a large gap, the pressure resistance strength can be effectively increased.

Further, since the cylindrical portion 72 has an inclination angle θ of 0° with respect to the can axis O, it has a high strength against a load in the direction along the can axis O, and the pressure in the capping device 60 during capping is increased. Buckling or deformation of the mouthpiece 24 due to the load of the block 61 or the load of the drawing die 62 can be reliably prevented.

(Bottle Can Body, Bottle Can Body with Cap: Third Embodiment)
FIG. 7 is a side view of a bottle can body according to a third embodiment of the present invention, and FIG. 8 is an enlarged cross-sectional view of the vicinity of the mouthpiece portion of the bottle can body with a cap according to the third embodiment of the present invention.
This third embodiment should also be called a modification of the above-described second embodiment. In the capped bottle can body 80 and the bottle can body 81 of the third embodiment, the cylindrical portion 72 of the connection portion 33 has an annular groove 82 into which the extension portion 43 of the cap 12 covering the connection portion 33 is partially fitted. , is formed so as to be connected around the can axis O.

In this embodiment, the annular groove 82 has a substantially V-shaped cross section along the can axis O as shown in FIG. , V-shaped wall surfaces 82b and the outer peripheral surface of the cylindrical portion 72 are connected to each other to form a convex curved cross section such as a convex circular arc. In a cross section along the can axis O, the groove depth d from the outer peripheral surface of the cylindrical portion 72 to the groove bottom portion 82a is, for example, in the range of 0.3 mm to 1.0 mm, and is V-shaped with the outer peripheral surface of the cylindrical portion 72. A groove width w between intersections Q of extension lines of the annular groove 82 and both wall surfaces is, for example, in the range of 2.0 mm to 4.0 mm. Further, the center of the annular groove 82 of this embodiment in the can axis O direction is slightly closer to the opening P side of the mouthpiece 24 than the position of 1/2 of the length L4 of the cylindrical portion 72 in the can axis O direction. are placed in

In the capped bottle can body 80 and the bottle can body 81 of the third embodiment, similarly to the second embodiment, when internal pressure is applied to the capped bottle can body 80, the pressure resistance and the mounting strength of the cap 12 are reduced. and prevent buckling and deformation during capping. Further, by partially fitting the extended portion 43 of the cap 12 covering the connecting portion 33 into the annular groove 82, an annular ridge portion 48 is formed and engaged with the annular groove 82, so that the cap is locked. Together with the engagement between the portion 34 and the winding portion 44 of the cap 12, the cap 12 can be attached to the base portion 24 more firmly, and the pressure resistance can be further improved. The annular groove 82 may have a U-shaped cross section or a semicircular cross section.

(Bottle can body capping method: Second embodiment)
Next, a second embodiment of the bottle-can capping method of the present invention for engaging a cap with the bottle-can body of the third embodiment will be described.
FIG. 9 is a cross-sectional view showing an example of a capping device 90 that engages the cap 12 with the bottle can body 81 of the third embodiment, and parts common to the capping device 60 shown in FIG. , and the explanation is omitted. Also, in the capping device 90 shown in FIG. 9, the parts for processing the top surface 41 of the cap 12, such as the pressure block 61 and the drawing die 62 of the capping device 60 shown in FIG. 4, are omitted from the illustration.

In other words, the capping device 90 used in the capping method for the bottle can body 81 of the second embodiment includes not only parts for processing the top surface 41 of the cap 12, such as the pressure block 61 and the draw die 62, which are not shown. , a seaming roller (forming roller) 63 for forming a seaming portion 44 on the cap engagement portion 34 (stepped portion 35) similar to the capping device 60 used in the capping method of the first embodiment; A grooving roller 91 is provided for partially fitting the extension 43 of the cap 12 into an annular groove 82 formed in the cylindrical portion 72 . As the grooving roller 91, a threading roller of a capping device used for manufacturing bottle can bodies with screw cap type caps can be used.

In the capping method of the second embodiment using such a capping device 90, similarly to the capping method of the first embodiment, while applying a load to the top surface 41 of the cap 12 using the pressure block 61, the drawing die is The edge of the top surface 41 is drawn by 62 to form a stepped portion 45, and the can is drawn along the periphery of the lower edge of the extension 43 of the cap 12 while a winding roller (forming roller) 63 is rotated. The lower edge portion is bent inward along the cap locking portion 34 of the mouthpiece portion 24 to form the seam portion 44 .

Further, in the capping method of the second embodiment, in addition to the processing of the top surface 41 of the cap 12 and the formation of the seam portion 44, the grooving roller 91 is rotated and rotated around the can axis O, The extended portion 43 of the cap 12 is approached at the position where the annular groove 82 of the bottle can body 81 is formed and pressed inward, and the extended portion 43 at this position is convex so as to partially follow the cross section of the annular groove 82 . , and fitted into the annular groove 82, the above-described annular protrusion 48 is formed. In the manufacturing process of a capped bottle can body of the screw cap type, since the mouthpiece is formed with a helical external thread, the threading roller moves in the can axis direction while revolving around the can axis. However, since the annular groove 82 is connected around the can axis O, the grooving roller 91 does not move in the can axis O direction.

Therefore, in the capping method of the second embodiment as well, a capping device used for capping a bottle can body with a screw-type cap is used, and the winding roller (bottom winding roller) 63 is used as a forming roller to form a winding portion. 44 can be molded, and a ridge 48 partially fitted in the annular groove 82 can be molded into the extension 43 by using a threaded roller as a grooving roller 91 for capping. Therefore, like the capping method of the first embodiment, it can be easily applied to the process of manufacturing screw-type capped bottle cans equipped with such a capping device, and is efficient.

Although embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and modifications can be made without departing from the scope of the invention. These embodiments and their modifications are included in the scope and spirit of the invention, as well as the scope of the invention described in the claims and equivalents thereof.

Next, the effects of the bottle can body and the capped bottle can body of the first, second and third embodiments will be described with reference to examples of the present invention. In this embodiment, based on these first, second, and third embodiments, a can axis from the bottom 22 to the opening P with a body portion 21 having a diameter of 66 mm and an aluminum alloy plate material having an original plate thickness of 0.345 mm was used. The height in the O direction is 133 mm, the diameter φ1 of the neck portion 32 is 36 mm, the inner diameter of the opening P is 31 mm, the width W1 of the cap engaging portion 34 in the horizontal direction perpendicular to the can axis O is 1.2 mm, and the inclination angle α is 1.2 mm. Ten 47° 300 ml bottle can bodies 11, 71, and 81 were manufactured. These are referred to as Examples 1 to 3 in order.

In Example 1, the inclination angle θ of the tapered portion 33a was 45°, and the length in the direction along the can axis O from the opening portion P to the intersection ridgeline between the cap engaging portion 34 and the neck portion 32 was 9 mm. . On the other hand, in Examples 2 and 3, the length in the direction along the can axis O from the opening P to the intersection ridgeline between the cap locking portion 34 and the neck portion 32 was 17 mm, and the direction along the can axis O of the cylindrical portion 72 was 17 mm. was 10 mm. In Example 3, the groove depth d of the annular groove 82 was 0.7 mm, and the groove width w was 3.5 mm.

Next, on the caps 24 of the bottle can bodies 11, 71, and 81 of Examples 1 to 3, a plate thickness t of 0.25 mm, which is also formed from an aluminum alloy plate material, and the top surface 41 and the seam portion 44 The cap 12 having a length (height) h of 17.7 mm and an outer diameter of the extension portion 43 of 38 mm was capped based on the capping method of the above-described first and second embodiments, and Examples 1 to 1 10 each of capped bottle can bodies 10, 70 and 80 of No. 3 were manufactured.

Then, when compressed air is supplied by opening holes in the bottom portions 22 of the bottle can bodies 11, 71, and 81 of the capped bottle can bodies 10, 70, and 80 of Examples 1 to 3, and the cap 12 comes off due to the internal pressure. were measured, and the compressive strength was compared by calculating the average value for each of 10 Examples 1-3.

As a result, while the average value of Example 1 based on the first embodiment was 0.42 MPa, the compressive strength of Example 2 based on the second embodiment was 0.88 MPa, which was approximately doubled. Further, in Example 3 based on the third embodiment, a compressive strength of 1.23 MPa, which is approximately three times that of Example 1, was obtained. As a result, as described above, the cylindrical portion 72 has higher pressure resistance than the tapered portion 33a on the side of the curl portion 31 of the connecting portion 33 from the cap locking portion 34. It has been demonstrated that the pressure resistance is even higher when the portion 72 is formed with an annular groove 82 into which the extended portion 43 of the cap 12 is partially fitted.

Reference Signs List 10, 70, 80 capped bottle body 11, 71, 81 bottle body 12 cap 21 body 22 bottom 23 shoulder 24 cap 31 curl 31f flat 32 neck 33 connection 33a taper 34 cap locking part 35 step portion 41 top surface 43 extension portion 44 winding portion 45 step portion 46 pull tab 47 cap liner 48 rib portion 60, 90 capping device 61 pressure block 62 drawing die 63 winding roller (forming roller)
72 Cylindrical portion 82 Annular groove 91 Grooving roller O Can axis θ Angle of inclination of tapered portion 33a with respect to can axis O

Claims (12)

A barrel formed in a cylindrical shape around the can axis, a bottom covering one end of the barrel, a shoulder extending from the other end of the barrel so as to reduce its diameter, and the shoulder A metal bottle can body having a mouthpiece extending from the part toward the opening at the other end,
The base portion includes a curl portion formed by winding the other end of the base portion outward, a neck portion connected to the shoulder portion, and a portion connecting the curl portion and the neck portion. and a connection extending to
The connecting portion has a perfect circular cross section perpendicular to the can axis at any position between the neck portion side and the curl portion side,
The connecting portion is provided with a cap engaging portion formed on the edge of a cylindrical extension of a cap that closes the opening of the mouthpiece and extends to cover the connecting portion. a stop portion and a cylindrical portion forming a peripheral surface parallel to the can axis on the curl portion side of the cap locking portion;
A bottle can body, wherein a lower end of said cylindrical portion is connected to said cap locking portion, and said cylindrical portion is a portion having a maximum diameter in said mouthpiece portion. 2. The bottle can body according to claim 1, wherein the cap engaging portion is formed of a stepped portion extending outward toward the curl portion side of the neck portion side of the connection portion. 3. The bottle can body according to claim 1, wherein the curled portion has a flat portion parallel to the can axis. 4. The connection portion includes a tapered portion closer to the curl portion than the cap engaging portion and having a diameter reduced toward the curl portion. 1. Bottle can body according to item 1. 5. The bottle can body according to claim 4, wherein the tapered portion is inclined in a range of 30° to 50° with respect to the can axis. 6. Any one of claims 1 to 5, wherein the length of the cylindrical portion along the can axis is 1/2 or more of the length of the connecting portion along the can axis. 1. The bottle can body according to claim 1. 6. An annular groove into which the extended portion of the cap covering the connecting portion is partially fitted is formed in the cylindrical portion so as to be connected around the can axis. The bottle can body described in . A bottle can body comprising: the bottle can body according to any one of claims 1 to 6; and the cap in which the seam tightening portion is engaged with the cap locking portion to close the opening of the mouthpiece. A bottle can body with a cap, characterized by: The bottle can body according to claim 7, wherein the seam tightening portion is engaged with the cap locking portion and the extension portion is partially fitted into the annular groove to close the opening of the mouthpiece. A bottle can body with a cap, comprising: the cap. 10. The capped bottle can body according to claim 8, wherein a cap liner is sandwiched between the inner surface of the cap and the curled portion. A bottle can body capping method for attaching a cap to the bottle can body according to any one of claims 1 to 6,
While applying a load toward the top surface of the cap using a pressure block, the edge of the top surface is drawn using a drawing die and the edge of the cap is tightened using a forming roller. A capping method for a bottle can, comprising forming a seam-fastening portion and engaging the cap engaging portion. A capping method for attaching a cap to the bottle can body according to claim 7, comprising:
While applying a load toward the top surface of the cap using a pressure block, the edge of the top surface is drawn using a drawing die and the edge of the cap is tightened using a forming roller. A method of capping a bottle can body, comprising forming a seam portion to engage with the cap engaging portion, and further fitting the extended portion of the cap partially into the annular groove using a groove roller. .

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