JP2018039571A - Bottle can body, bottle can body with cap, method for capping bottle can body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bottle can body to which an easily openable cap having excellent sealing property can be attached without deforming a curl portion. SOLUTION: A body portion formed in a cylindrical shape centered on a can shaft, a bottom portion closing one end of the body portion, and a shoulder portion 23 extending from the other end portion of the body portion so as to reduce the diameter. A metal bottle can body 11 having a base portion 24 extending from the shoulder portion 23 toward the opening of the other end portion, wherein the base portion 24 winds the other end portion outward. A rotated curl portion 31, a neck portion 32 connected to the shoulder portion 23, and a connection portion 33 extending so as to connect between the curl portion 31 and the neck portion 32 are provided, and the connection portion 33 has a neck portion 32 side. A cap locking portion 34 that engages with a winding portion 44 formed at the edge of a cylindrical extension portion 43 extending so as to cover the connection portion 33 in the cap 12 that closes the opening of the base portion 24 is provided. Be done. [Selection diagram] Fig. 3

Description

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

  As a can body that is filled and sealed with contents such as beverages, a bottle can body having a can body (wall) and a can bottom (bottom) and having a shoulder portion with a reduced diameter on the opening side is known. At the tip of the shoulder portion of such a bottle can body, a base portion for attaching a cap that plugs the opening is formed. As a cap for plugging the bottle can body, a screw cap is known that is screwed into a screw groove formed in a base (see, for example, Patent Document 1).

  However, the screw cap type bottle can body needs to rotate the screw cap so as to break a cut portion called a bridge portion formed at the edge of the screw cap when opening the cap. Such pivoting may not be preferred, and bottles without screws may be required.

On the other hand, a pull-tab type cap (an easily openable cap) is known as a cap of a bottle can body that can be easily opened (see, for example, Patent Document 2). This pull tab type cap forms a curled portion in which the end portion of the cap portion of the bottle can body is curled outward, and the edge portion of the cap is bent so as to be wound around the curved surface of the curled portion. It is attached to the base of the can body.
When opening the cap, the cap can be easily opened simply by pulling the pull tab upward so as to cut off the edge of the cap engaged with the bottle can body.

Japanese Patent No. 4908544 Japanese Patent No. 5323757

  Since the bottle can body corresponding to the pull-tab type cap shown in Patent Document 2 winds and locks the edge portion of the cap around the curled portion forming the opening of the bottle can body, the winding diameter of the curled portion is set to the edge portion of the cap. Needs to be large enough to allow winding. However, when the winding diameter of the curled portion is increased, the strength of the curled portion is reduced. For this reason, there is a concern that the curled portion is deformed due to the stress when the edge portion of the cap is wound. Moreover, since it is difficult to squeeze the outer periphery of the cap when the curled portion is enlarged, there is also a concern that the sealing performance is lowered when a thin bottle can is plugged.

  This invention was made in view of the above-described circumstances, and without deforming the curl portion forming the opening of the bottle can body, a bottle can body that can be attached with an easily openable cap excellent in sealing performance, It aims at providing the bottle can body with a cap, and the capping method of a bottle can body.

  In order to solve the above-mentioned problems, a bottle can body according to the present invention includes a body portion formed in a cylindrical shape around a can shaft, a bottom portion that closes one end portion of the body portion, and the other of the body portions. A metal bottle can body having a shoulder portion extending so as to be reduced in diameter from an end portion thereof and a base portion extending from the shoulder portion toward an opening portion of the other end portion, A curl part in which the other end of the base part is wound outward, a neck part connected to the shoulder part, and a connection part extending so as to connect between the curl part and the neck part The connecting portion is engaged with a tightening portion formed on an edge portion of a cylindrical extension portion extending to cover the connecting portion in a cap that closes the opening of the base portion on the neck portion side. A cap locking portion is provided.

  According to the bottle can body of the present invention, the cap locking position is different from the curled portion separated from the curled portion of the bottle can body via the connecting portion with respect to the formation position of the tightening portion for engaging the cap with the bottle can body. By using the portion, it is not necessary to wrap and engage the edge portion of the cap around the curled portion, so that the winding diameter of the curled portion can be reduced.

  Therefore, by reducing the curled diameter of the curled portion in this way, the strength of the curled portion can be increased, and even if the base portion of the bottle can body is formed of a thin metal plate, the curled portion is deformed, It won't be crushed. Therefore, the outer periphery of the cap can be squeezed to improve the adhesion between the inner surface of the cap and the curled portion, and the liquid contained in the bottle can body can be reliably sealed.

  Here, the cap locking portion may be formed of a stepped portion that is widened outwardly with the neck portion side of the connection portion facing the curl portion side. Furthermore, the curl portion may have a flat portion parallel to the can shaft.

  Further, the connecting portion may include a tapered portion having a diameter reduced toward the curled portion side closer to the curled portion side than the cap locking portion. When providing such a tapered portion by making the formation position of the tightening portion for engaging the cap with the bottle can body different from the curled portion of the bottle can body as described above, The inclination angle of the tapered portion with respect to the can axis can be reduced, that is, it can be made more parallel to the can axis. As a result, for example, the strength in the direction along the can axis of the tapered portion can be increased as compared with a screw cap type bottle can, so that the die portion is seated along the can axis when the die portion is molded. It is possible to prevent problems such as bending. The tapered portion is preferably inclined at an inclination angle in a range of 30 ° to 50 ° with respect to the can shaft.

  Furthermore, the connection part may include a cylindrical part centered on the can shaft on the curl part side of the cap locking part. By forming such a cylindrical portion, when an internal pressure is applied to the bottle can body as a bottle can body with a cap, it engages with the vicinity of the top surface of the cap deformed by the internal pressure and the cap locking portion. Since the winding portion can be separated, the pressure strength can be effectively increased. It is also possible to more reliably prevent buckling of the base portion by setting the inclination angle of the cylindrical portion of the connecting portion with respect to the can axis to 0 °.

  Furthermore, when such a cylindrical portion is provided in the connection portion, an annular groove into which the extension portion of the cap covering the connection portion is partially fitted is provided around the can shaft. You may form so that it may wrap around and may be connected. When the extended portion of the cap is partially fitted in such an annular groove, the cap is strongly engaged with the cap portion together with the tightening portion that engages with the cap locking portion, and the bottle can body with the cap It is possible to further increase the pressure resistance strength and the mounting strength of the cap.

  Moreover, the bottle can body with a cap of the present invention includes the bottle can body as described above, and the cap that closes the opening of the base portion by engaging the winding fastening portion with the cap locking portion. It is characterized by that.

  In particular, the connecting portion of the bottle can body includes a cylindrical portion centered on the can shaft, and an annular groove into which the extension portion covering the connecting portion of the cap is partially fitted, When formed so as to be connected around the can shaft, the winding fastening portion engages with the cap locking portion and the extension portion is partially fitted into the annular groove. By providing the cap that closes the opening of the cap portion, it is possible to further increase the pressure resistance of the bottle can with cap 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.

  Furthermore, the bottle can body capping method of the present invention is a bottle can body capping method for attaching a cap to the bottle can body as described above, and applying a load toward the top surface of the cap using a pressure block. While the drawing die is used to draw the edge of the top surface, the forming roller is used to form a winding fastening portion that winds up the edge of the cap and is locked to the cap locking portion. It is characterized by that.

  According to such a bottle can capping method, for example, a cap can be used by using a winding roller (hem winding roller) of a capping device used for manufacturing a bottle cap body with a screw cap type cap as the forming roller. A bottle fastening body can be capped with a cap by forming a tightening portion to be engaged with the body in a cap locking portion below the curl portion.

  Furthermore, also in such a capping method, the connection part of the bottle can body includes a cylindrical part centering on the can axis, and an extension part that covers the connection part of the cap is a part of the cylindrical part. When the annular groove to be fitted is formed so as to circulate and connect around the can axis, a drawing die is used while applying a load toward the top surface of the cap using a pressure block. Then, the edge portion of the top surface is drawn and formed, and a tightening portion is formed by tightening the edge portion of the cap with a forming roller to be engaged with the cap engagement portion, and a grooving roller is further used. The extension of the cap may be partially fitted into the annular groove.

  According to such a capping method, for example, a winding roller (hem winding roller) of a capping device used for manufacturing a bottle cap body with a screw cap type cap is used as the forming roller, and a thread cutting roller is used as the grooving roller. As a result, the cap can be engaged by the cap locking portion and the annular groove to further improve the pressure resistance strength of the bottle can body with the cap and the mounting strength of the cap.

  As described above, according to the present invention, a bottle can body that can be attached with an easily openable cap having excellent sealing performance without deforming a curled portion that forms an opening of the bottle can body, and a bottle can with a cap A body and a method for capping a bottle can body can be provided.

It is a perspective view of the appearance which shows the bottle can body with a cap of a 1st embodiment of the present invention. It is sectional drawing along the can axis | shaft of the bottle can body of embodiment shown in FIG. It is sectional drawing which expanded the nozzle | cap | die part periphery of the bottle can body with a cap of embodiment shown in FIG. It is sectional drawing which shows an example of the capping apparatus which engages a cap with the bottle can body of embodiment shown in FIG. It is a side view of the bottle can body of 2nd Embodiment of this invention. It is sectional drawing to which the cap part periphery of the bottle can body with a cap of 3rd Embodiment of this invention which attached the cap to the cap part of the bottle can body of embodiment shown in FIG. 5 was expanded. It is a side view of the bottle can body of 3rd Embodiment of this invention. It is sectional drawing which expanded the nozzle | cap | die part periphery of the bottle can body with a cap of 4th Embodiment of this invention which attached the cap to the nozzle | cap | die part of the bottle can body of embodiment shown in FIG. It is sectional drawing which shows an example of the capping apparatus which engages a cap with the bottle can body of embodiment shown in FIG.

  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. Each embodiment described below is specifically described for better understanding of the gist of the invention, and does not limit the present invention unless otherwise specified. In addition, in the drawings used in the following description, in order to make the features of the present invention easier to understand, there is a case where a main part is shown in an enlarged manner 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)
Drawing 1 is an appearance perspective view showing a bottle can with a cap of a 1st embodiment. Moreover, FIG. 2 is sectional drawing along the can axis | shaft of the bottle can body of 1st Embodiment.
A bottle can body 10 with a cap according to the first embodiment includes a bottle can body 11 according to the first embodiment and a pull tab type cap 12 capable of plugging an opening P of the bottle can body 11.

  The bottle can body 11 is entirely made of a metal, for example, an aluminum alloy, and has a body portion 21 formed in a cylindrical shape having a circular cross section around the can axis O, and one end portion (lower end portion) of the body portion 21. A bottom 22 that closes the shoulder, a shoulder 23 that extends from the other end (upper end) of the body 21, and an opening P at the other end of the bottle can body 11 from the shoulder 23. And a base portion 24 extending in a vertical direction.

  In the present embodiment, the body portion 21, the bottom portion 22, the shoulder portion 23, and the base portion 24 are integrally formed from a single aluminum alloy plate. For example, a bottomed cylindrical body in which a body portion 21 and a bottom portion 22 are formed by subjecting a plate material of aluminum alloy having a plate thickness of 0.270 mm to 0.370 mm to cupping processing by a cupping press and then performing drawing ironing processing (DI processing). (DI can) is formed, and then the shoulder part 23 and the base part 24 are formed by a necking machine equipped with a die processing tool (neck forming mold).

  The bottom portion 22 is reduced in diameter so that the outer peripheral portion is directed downward toward the inner peripheral side, and the bottom surface 22 a of the inner peripheral portion is curved in a dome shape toward the inside of the bottle can body 11. Further, the shoulder portion 23 is connected to the other end portion of the body portion 21, and is centered on the can shaft O that is continuously reduced in diameter along the can shaft O toward the other end portion of the bottle can body 11. It has a truncated cone shape and is formed in a constricted shape so as to incline smoothly.

FIG. 3 is an enlarged cross-sectional view of the periphery of the cap portion 24 of the bottle can body 10 with a cap according to the first embodiment.
The base portion 24 is a portion connected to the other end portion of the shoulder portion 23, and a pull tab type cap 12 described later is engaged therewith. The base part 24 includes a curl part 31 in which the other end part of the base part 24 is wound outward by curling, and a straight shape (can shaft connected to the shoulder part 23 and parallel to the can axis O. And a neck portion 32 having a cylindrical shape centered on O and a connecting portion 33 extending so as to connect the curled portion 31 and the neck portion 32. The connecting portion 33 is formed by winding the lower edge portion of the extending portion 43 extending so as to cover the connecting portion 33 in the cap 12 that closes the opening portion P of the base portion 24 on the neck portion 32 side. A cap locking portion 34 that engages with 44 is provided.

The straight neck portion 32 parallel to the can axis O has one end connected 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. The length L1 has a cylindrical shape of, for example, about 5.0 mm to 50.0 mm.
The neck portion 32 may have a tapered shape that is inclined at 0 ° to 10 ° in the vertical direction. Furthermore, it is not limited to a linear taper, but may be a curved shape, or a tapered shape combining a curved line and a straight line.

The curled portion 31 has a lateral radius (winding diameter) φ2 perpendicular to the can axis O of, for example, about 1.0 mm to 3.0 mm, and a longitudinal radius (winding diameter) φ3 parallel to the can axis O of, for example, 1. It has a substantially oval shape of about 5 mm to 5.0 mm. Further, the curvature radius r1 of the upper end portion 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 periphery of the curled portion 31 by throttle processing. The length L2 parallel to the can axis O of the flat portion 31f is formed to be approximately 1.0 mm to 3.5 mm, for example.

Further, the connecting portion 33 includes a taper portion 33a that is reduced in diameter from the cap locking portion 34 toward the curl portion 31 in the first embodiment. .
The taper portion 33a is inclined outwardly toward the cap locking portion 34 side at a constant angle in the range of 30 ° to 50 ° with respect to the can axis O. The inclination angle θ of the tapered portion 33a is more preferably in the range of 43 ° to 48 °. Further, the length L3 in the direction along the can axis O of the tapered portion 33a from the lower end of the curled portion 31 is formed to be, for example, about 2.0 mm to 10.0 mm.

The cap locking portion 34 according to the first embodiment includes a step portion 35 in which an end portion on the neck portion 32 side of the connection portion 33 is widened outwardly toward the curl portion 31 side.
Such a step portion 35 is formed such that a lateral width W1 perpendicular to the can axis O is, for example, about 1.5 mm to 3.5 mm. Further, the stepped portion 35 has a tapered shape that is slightly inclined toward the curled portion 31 side (upper end side) from the end portion of the neck portion 32 toward the end portion of the tapered portion 33a.
The lower edge portion of the cylindrical extension 43 of the cap 12 is wound along the stepped portion 35 (cap locking portion 34) having such a shape, so that a wound portion 44 is formed.

The cap 12 plugs the opening P of the base portion 24 of the bottle can body 11, and is entirely made of metal, for example, an aluminum alloy.
The cap 12 includes a disk-shaped top surface 41 that covers the opening P of the base portion 24, a bent portion 42 that extends from the outer edge of the top surface 41 and bends in contact with the curled portion 31, and a connection portion 33 (taper portion 33a). ) And a cylindrical extension 43 extending downward (cap locking part 34 side) parallel to the can axis O, and a tightening part 44 that tightens the lower edge of the extension 43. . Further, a step 45 having a step along the can axis O direction is formed between the top surface 41 of the cap 12 and the bent portion 42 and narrows the outer periphery of the top surface 41 of the cap 12.

The thickness t of the cap 12 is, for example, about 0.22 mm to 0.30 mm. Further, the length (height) h between the top surface 41 of the cap 12 and the tightening portion 44 is, for example, about 3.5 mm to 15.0 mm, or about 10.0 mm to 18.0 mm.
Further, the winding portion 44 of the cap 12 is formed when the opening P of the bottle can body 11 is plugged, and the cap 12 before forming the winding fastening portion 44 is put on the base portion 24 of the bottle can body 11. Then, the lower edge part of the extension part 43 of the cap 12 is wound around the step part 35 (cap locking part 34) using a capping device. In addition, the capping method of a bottle can body is mentioned later.

  In addition, a pull tab 46 (see FIG. 1) is formed on a part of the cap 12 in the circumferential direction so as to protrude downward from the winding portion 44. By pulling up the ring portion 46 a, the pull tab 46 opens a part of the winding fastening portion 44 to release the engagement between the winding fastening portion 44 and the cap locking portion 34, and further from the extension 43 to the bending portion 42. As a result, the cap 12 is broken, so that the cap 12 can be removed from the base 24 and the opening P can be exposed. Such a pull tab 46 is formed along the grooves 46b and 46b by forming a pair of linear grooves 46b and 46b in the winding portion 44 and the extension 43 connected to the pull tab 46 and thinning the portions. A part of the winding part 44 and the extension part 43 is cut open by the width.

  Further, a cap liner 47 is sandwiched between the inner surface of the top surface 41 of the cap 12 and the curled portion 31. Such a cap liner 47 is a packing that keeps the gap between the cap 24 and the cap 12 in the vicinity of the opening P liquid-tight. The cap liner 47 is made of a resin sheet, for example. Such a cap liner 47 is disposed on the inner surface of the cap 12 before capping, which will be described later, or is bonded by thermal fusion or adhesive, and is crimped by capping. 45 and the flat portion 31 f of the curled portion 31.

  According to the bottle can body 11 and the bottle can body 10 with the cap configured as described above, the formation position of the winding fastening portion 44 that engages the cap 12 with the bottle can body 11 is determined from the curled portion 31 of the bottle can body 11. By making the step portion 35 (cap locking portion 34) different from the curled portion 31 separated via the connecting portion 33, it is not necessary to wrap and engage the edge portion of the cap 12 around the curled portion 31. 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, and even if the base portion 24 of the bottle can body 11 is formed of a thin aluminum alloy plate material, The part 31 is not deformed or crushed. For this reason, the outer periphery of the cap 12 can be squeezed with a predetermined load to improve 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 do.

  Moreover, when the connection part 33 is provided with the taper part 33a diameter-reduced toward the curl part 31 side from the cap latching | locking part 34 side like this embodiment, the cap 12 is engaged with the bottle can body 11 in this way. By forming the winding portion 44 at a step 35 (cap engaging portion 34) different from the curled portion 31 of the bottle can body 11, the inclination angle of the tapered portion 33a with respect to the can axis O is reduced. That is, it can be made more parallel to the can axis O. This increases the strength of the tapered portion 33a in the direction along the can axis O as compared with, for example, a screw cap type bottle can, so that the cap portion 24 is connected to the can shaft O when the die portion 24 is molded. It is possible to prevent problems such as buckling along.

  In addition, when the connection part 33 is provided with the taper part 33a in this way, this taper part 33a inclines with the inclination | tilt angle (theta) of the range of 30 degrees-50 degrees with respect to the can axis | shaft O like this embodiment. It is desirable. If the inclination angle θ exceeds 50 °, buckling may occur when the base portion 24 is formed. On the other hand, if the inclination angle θ is less than 30 °, the length L3 along the can axis O of the tapered portion 33a is increased. Accordingly, the length (height) h of the cap 12 must be increased accordingly, which is uneconomical.

  Further, in the present embodiment, the cap locking portion 34 is formed by a stepped portion 35 that is widened outwardly with the neck portion 32 side of the connecting portion 33 facing toward the curled portion 31 side. Can be securely tightened and engaged with the cap locking portion 34 (step 35), and the cap 12 can be stably attached to the base portion 24.

  In addition, the taper shape which inclines slightly toward the other edge part (upper end part) side of the bottle can body 11 as the level | step-difference part 35 goes to the edge part of the connection part 33 from the edge part of the neck part 32 like this embodiment. In this case, 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 be difficult to ensure sufficient attachment strength and pressure resistance strength for the cap 12, while if the inclination angle α is smaller than this, the bottle can body 11 is formed. There is a risk of cracking.

  Furthermore, in the bottle can body 11 of the present embodiment, the curled portion 31 of the base portion 24 has a flat portion 31f parallel to the can axis O, and when the step portion 45 is formed on the cap 12, By inserting the cap liner 47 between the stepped portion 45, it becomes easy to ensure the sealing performance. In particular, in a positive pressure can in which an internal pressure is applied in the bottle can body 11, even if the internal pressure rises, the sealing performance is reliably ensured by the cap liner 47 sandwiched between the flat portion 31f and the step portion 45. be able to.

(Capping method for bottle can body: first embodiment)
Next, a first embodiment of a bottle can capping method for engaging a cap with a bottle can of the present invention will be described.
FIG. 4 is a cross-sectional view showing an example of a capping device for engaging a cap with a bottle can body.
When the cap 12 is wound and capped on the bottle can body 11 of the first embodiment shown in FIGS. 1 to 3, for example, a capping device 60 shown in FIG. 4 is used. The capping device 60 is formed around a pressure block 61 that presses the top surface 41 of the cap 12 that covers the bottle can body 11 downward, and around the pressure block 61, and narrows the outer periphery of the top surface 41 of the cap 12. A drawing die 62 for forming the stepped portion 45, and a winding roller (forming roller) 63 for winding the edge of the cap 12 to form the tightened portion 44 on the cap locking portion 34 (stepped portion 35). I have.

The pressure block 61 includes a pressing body 65 that presses the top surface 41 of the cap 12. The pressure block 61 is connected to the pressure shaft 67 through an urging spring 66. When the cap 12 is attached, the pressure block 61 covers the cap portion 24. The pressing load for pressing the twelve top surfaces 41 can be changed according to the size of the diameter of the base portion 24.
The winding roller 63 is rotatably supported by a support arm 68 and can be rotated 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, a cap liner 47 is first disposed on the inner surface of the base portion 24 of the bottle can body 11 in advance. The attached cap 12 (a cup-shaped cap material before the winding portion 44 is formed) is covered.

  Then, while applying a predetermined load toward the top surface 41 of the cap 12 using the pressure block 61, the edge portion 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 around the lower edge portion of the extension portion 43 of the cap 12 around the can axis O and brought into contact with the lower edge portion.

  Thereby, the lower edge part of the extension part 43 of the cap 12 is bent inward along the cap engaging part 34 (step part 35) of the base part 24 of the bottle can body 11, and the winding part 44 is formed. Through the above steps, the cap 12 is wound around the base portion 24, and the bottle can body 10 with the cap in which the bottle can body 11 is plugged with the cap 12 can be obtained.

  According to the capping method of the bottle can body as described above, the winding tightening portion 44 for engaging the cap 12 with the bottle can body 11 is formed on the stepped portion 35 (cap locking portion 34) below the curled portion 31. Once formed, the bottle can body 11 can be capped (embedded) with the cap 12.

  In the capping method for the bottle can body 11 according to the present embodiment, the capping device used for capping the bottle can body with the screw cap can perform capping without using the thread cutting roller for forming the screw. It can be easily applied to the manufacturing process of a screw-type bottle with a cap provided with such a capping device, and is efficient. In addition, the capping method of the bottle can body of this 1st Embodiment is applicable also to the capping to the bottle can body of 2nd Embodiment described below.

(Bottle can body, bottle can body with cap: second embodiment)
FIG. 5 is a side view of the bottle can body according to the second embodiment of the present invention, and FIG. 6 is an enlarged cross-sectional view of the periphery of the cap portion of the bottle can body with a cap according to the second embodiment of the present invention.
In the second embodiment and the fourth embodiment to be described later, the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In the drawings of the second and third embodiments, the symbols for the dimensions and inclination angles shown in FIGS. 2 and 3 are omitted, but the numerical range of the first embodiment is applied when there is no description. Is done.
In the bottle can body 70 with cap and the bottle can body 71 of the second embodiment, the connecting portion 33 includes a cylindrical portion 72 centering on the can axis O on the curl portion 31 side of the cap locking portion 34. It is characterized by being.

  The cylindrical portion 72 has a length L4 in the direction along the can axis O of, for example, 5.0 mm to 15.0 mm, and has a constant inner and outer diameter within the range of the length L4. As shown in the figure, it occupies most of the length of the connecting portion 33 or more. In the second embodiment, the length from the opening portion P of the base portion 24 to the intersecting ridge line portion between the cap locking portion 34 and the neck portion 32 is also made 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. In the present embodiment, a tapered portion 33a having a diameter reduced toward the curled portion 31 is formed between the cylindrical portion 72 and the curled portion 31, and the tapered portion 33a is formed on the curled portion 31 side. A plurality of steps (in this embodiment, two steps) are formed in a taper shape in which the inclination angle θ with respect to the can axis O increases stepwise.

  In such a bottle can body 71 and a bottle can body 70 with a cap according to the second embodiment, as in the first embodiment, the winding diameter of the curled portion 31 is reduced to increase the strength, thereby preventing deformation and crushing. Of course, in the case of a positive pressure can in which an internal pressure is applied to the bottle can body 71 in the bottle can body 70 with a cap, the vicinity of the top surface 41 of the cap 12 deformed by the internal pressure and the cap locking portion 34. Since the space | interval can be ensured apart from the winding-up part 44 engaged with (the level | step difference part 35), a pressure | voltage resistant strength can be raised effectively.

  Further, since the cylindrical portion 72 has an inclination angle θ with respect to the can axis O of 0 °, the strength against the load in the direction along the can axis O is high, and the pressure in the capping device 60 during capping is high. It is possible to reliably prevent buckling or deformation of the base portion 24 due to the load by the block 61 or the drawing molding load by the drawing die 62.

(Bottle can body, bottle can body with cap: third embodiment)
FIG. 7 is a side view of the bottle can body according to the third embodiment of the present invention, and FIG. 8 is an enlarged cross-sectional view of the periphery of the cap portion of the bottle can body with a cap according to the third embodiment of the present invention.
This third embodiment should also be referred to as a modification of the above-described second embodiment, whereas the cylindrical portion 72 of the second embodiment has a constant inner and outer diameter in the range of its length L4. In the bottle can body 80 and the bottle can body 81 of the third embodiment, the annular groove 82 into which the extension portion 43 of the cap 12 covering the connection portion 33 is partially fitted in the cylindrical portion 72 of the connection portion 33. It is characterized by being formed so as to circulate around the can axis O.

  In the present embodiment, the annular groove 82 has a substantially V-shaped cross section along the can axis O as shown in FIG. 8, except that the groove bottom portion 82a is formed in a concave curved section such as a concave arc. The connecting portion between the V-shaped wall surfaces 82b and the outer peripheral surface of the cylindrical portion 72 is formed in a convex curve shape such as a convex arc. In the 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 the outer peripheral surface of the cylindrical portion 72 is V-shaped. The groove width w between the intersection points Q of the extension lines with the both wall surfaces of the annular groove 82 that is formed in a range of, for example, 2.0 mm to 4.0 mm. Further, the annular groove 82 of the present embodiment has a center in the can axis O direction slightly closer to the opening P side of the base portion 24 than a position of 1/2 of the length L4 of the cylindrical portion 72 in the can axis O direction. Is arranged.

  In the bottle can body 80 with cap and the bottle can body 81 according to the third embodiment, as in the second embodiment, when the internal pressure is applied to the bottle can body 80 with cap, the pressure resistance strength and the attachment strength of the cap 12 are as follows. And can prevent buckling and deformation during capping. Further, the extended portion 43 of the cap 12 that covers the connecting portion 33 is partially fitted into the annular groove 82, so that the annular protrusion 48 is formed and engages with the annular groove 82. In combination with the engagement between the portion 34 and the tightening 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.

(Capping method for bottle can body: second embodiment)
Next, a second embodiment of the bottle can capping method of the present invention in which a cap is engaged 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 the same reference numerals are used for portions common to the capping device 60 shown in FIG. The explanation is omitted. Further, in the capping device 90 shown in FIG. 9, the portions of 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 not shown.

  That is, the capping device 90 used in the capping method for the bottle can body 81 of the second embodiment has a pressure block 61 (not shown) and a portion for processing the top surface 41 of the cap 12 such as a drawing die 62. A winding roller (molding roller) 63 that forms a tightening portion 44 on the cap locking portion 34 (step 35) similar to the capping device 60 used in the capping method of the first embodiment, and the bottle can body 81 A grooving roller 91 for partially fitting the extension 43 of the cap 12 into an annular groove 82 formed in the cylindrical portion 72 is provided. As the grooving roller 91, a threading roller of a capping device used for manufacturing a bottle cap body with a screw cap type cap can be used.

  In the capping method of the second embodiment using such a capping device 90 as well as 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, a drawing die is used. 62, the edge of the top surface 41 is drawn to form a step 45, and a can is formed along the periphery of the lower edge of the extension 43 of the cap 12 while rotating a winding roller (forming roller) 63. Around the axis O, it approaches and contacts, and this lower edge part is bent inward along the cap locking part 34 of the base part 24 to form a tightening part 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 tightening portion 44, while rotating the grooving roller 91 around the can axis O, In the position where the annular groove 82 of the bottle can 81 is formed, the cap 43 is made to approach the extension part 43 and press inward, and the extension part 43 at this position is convex so as to partially follow the cross section of the annular groove 82. The above-described annular protrusion 48 is formed by being deformed into the annular groove 82. In the manufacturing process of the bottle cap body with the screw cap type cap, since the spiral male screw portion is formed in the base portion, the thread cutting roller moves in the can axis direction while circling 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 direction of the can axis O.

  Therefore, also in the capping method of the second embodiment, the capping device used for capping the bottle can body with the screw type cap is used, and the winding roller (hem winding roller) 63 is used as a forming roller to form a winding portion. 44 is formed, and the threaded roller is used as a grooving roller 91, and a protrusion 48 that is partially fitted into the annular groove 82 is formed in the extension 43 to perform capping. For this reason, like the capping method of 1st Embodiment, it can be easily applied to the manufacturing process of a screw-type bottle can with a cap provided with such a capping device, and is efficient.

  As mentioned above, although embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof in the same manner as included in the scope and gist of the invention.

  Next, the effects of the bottle can body and the bottle can body with the cap of the first, second, and third embodiments will be described with reference to examples of the present invention. In this example, based on these first, second, and third embodiments, a can shaft from an aluminum alloy plate material having a base plate thickness of 0.345 mm to a diameter of the trunk portion 21 of 66 mm and from the bottom 22 to the opening P is 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 lateral width W1 perpendicular to the can axis O of the cap locking portion 34 is 1.2 mm, and the inclination angle α is Ten bottle cans 11, 71, 81 for 300 ml each having a 47 ° 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 P to the intersecting ridge line between the cap locking portion 34 and the neck portion 32 was 9 mm. . On the other hand, in Examples 2 and 3, the length along the can axis O from the opening P to the intersecting ridge line between the cap locking portion 34 and the neck portion 32 is 17 mm, and the direction along the can axis O of the cylindrical portion 72 The length L4 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, the base 24 of the bottle can bodies 11, 71, 81 of Examples 1 to 3 has a thickness t of 0.25 mm, which is formed from the same aluminum alloy plate material, and the top surface 41 and the tightening portion 44. A cap 12 having a length (height) h of 17.7 mm and an extension portion 43 having an outer diameter of 38 mm is capped based on the capping method according to the first and second embodiments described above. Ten bottled cans 10, 70 and 80 with 3 caps were manufactured.

  Then, when the cap 12 is removed by the internal pressure by making a hole in the bottom portion 22 of the bottle can body 11, 71, 81 in the bottle can bodies 10, 70, 80 with caps of Examples 1 to 3, and supplying compressed air. The pressure strength was compared by measuring the pressure of each and calculating the average value for each of the ten Examples 1 to 3.

  As a result, the average value of Example 1 based on the first embodiment was 0.42 MPa, whereas in Example 2 based on the second embodiment, the compressive strength was approximately doubled to 0.88 MPa. Furthermore, in Example 3 based on the third embodiment, 1.23 MPa, which is approximately three times the pressure strength of Example 1, was obtained. As a result, as described above, the cylindrical portion 72 is higher in pressure resistance than the one having the tapered portion 33a on the curl portion 31 side than the cap locking portion 34 of the connection portion 33, and in particular, the cylindrical portion It has been proved that the pressure resistance is higher when the annular groove 82 in which the extension 43 of the cap 12 is partially fitted in the portion 72 is formed.

10, 70, 80 Bottle can body with cap 11, 71, 81 Bottle can body 12 Cap 21 Body portion 22 Bottom portion 23 Shoulder portion 24 Base portion 31 Curled portion 31f Flat portion 32 Neck portion 33 Connection portion 33a Taper portion 34 Cap locking portion 35 Stepped portion 41 Top surface 43 Extension portion 44 Winding portion 45 Step portion 46 Pull tab 47 Cap liner 48 Projection portion 60, 90 Capping device 61 Pressure block 62 Drawing die 63 Winding roller (molding roller)
72 Cylindrical part 82 Annular groove 91 Grooving roller O Can axis θ Inclination angle of taper part 33a with respect to can axis O

Claims (12)

A body part formed in a cylindrical shape centering on the can shaft, a bottom part that closes one end part of the body part, a shoulder part that extends from the other end part of the body part so as to reduce the diameter, and the shoulder part A metal bottle can body having a base portion extending from the portion toward the opening at the other end,
The base part connects the curl part in which the other end part of the base part is wound outward, the neck part connected to the shoulder part, and the curl part and the neck part. A connecting portion extending to
The connection portion includes a cap member that engages with a tightening portion formed at an edge portion of a cylindrical extension portion that extends to cover the connection portion in a cap that closes the opening of the base portion on the neck portion side. A bottle can having a stopper.   2. The bottle can body according to claim 1, wherein the cap locking portion includes a stepped portion that is widened outwardly with the neck portion side of the connection portion facing toward the curled portion side.   The bottle can body according to claim 1, wherein the curled portion has a flat portion parallel to the can shaft.   The said connection part is equipped with the taper part diameter-reduced toward this curl part side in the said curl part side rather than the said cap latching | locking part, The any one of Claims 1-3 characterized by the above-mentioned. The bottle can body according to one item.   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 shaft.   The said connection part is provided with the cylindrical part centering on the said can axis | shaft in the said curl part side rather than the said cap latching | locking part, The Claim 1 characterized by the above-mentioned. The described bottle can body.   The annular groove in which the extension part of the cap that covers the connection part is partially fitted is formed in the cylindrical part so as to circulate around the can shaft. The bottle can body described in 1.   A bottle can body according to any one of claims 1 to 6, and the cap that closes the opening of the base portion by engaging the winding fastening portion with the cap locking portion. A bottled can with a cap characterized by that.   The bottle can body according to claim 7 and the cap fastening portion engage with the tightening portion, and the extension portion is partially fitted into the annular groove to close the opening of the base portion. A bottle can body with a cap comprising the cap.   The cap can with a cap according to claim 8 or 9, wherein a cap liner is sandwiched between an 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 was drawn using a drawing die and the edge of the cap was wound using a forming roller. A capping method for a bottle can body, wherein a tightening portion is formed and engaged with the cap locking portion. A bottle can body capping method for attaching a cap to the bottle can body according to claim 7,
While applying a load toward the top surface of the cap using a pressure block, the edge of the top surface was drawn using a drawing die and the edge of the cap was wound using a forming roller. A capping method for a bottle can body comprising: forming a tightening portion to be engaged with the cap locking portion; and further using a grooving roller to partially fit the extension portion of the cap into the annular groove. .

Images