JP3286797B2 - Aerosol can and manufacturing method thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aerosol can and a method of manufacturing the same, and more particularly, to reducing the thickness of a can bottom of an aerosol can to reduce the amount of metal material, and to provide a protective seal and a protective cap for a valve body. The present invention relates to an aerosol can that can be stuck and attached securely and easily, and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, aerosol cans in which a propellant such as chlorofluorocarbon and liquefied natural gas is supplied to an aerosol can or a valve element for exhausting the propellant to the outside when the propellant is abandoned are mounted on the bottom of the can. Sold in. FIG. 4 shows an example of such an aerosol can. In FIG. 4, reference numeral 50 denotes an aerosol can. A valve body 53 is attached to a valve hole 52 of a can bottom 51 of the aerosol can 50, and a protective seal 55 is attached to a horizontal surface 54 of the can bottom 51.

[0003]

However, in the can bottom 51 of such a conventional aerosol can 50, a valve body 53 having a certain height must be mounted on the can bottom 51. In this case, the valve body 53 is mounted in a state where the thickness of the can bottom 51 is increased, but there is a disadvantage that the production cost is increased because a large amount of metal material is consumed. In addition, the aerosol can having a small can diameter has a disadvantage that, in addition to the above-mentioned disadvantages, the area of the horizontal surface 54 for attaching the protective seal cannot be sufficiently secured, so that it is difficult to attach the protective seal 55, and the protective cap is attached. It was difficult.

The present invention has been made in view of such conventional problems, and aims to reduce the amount of metal material on the bottom of an aerosol can and to allow a protective seal or a protective cap to be stuck or attached with a margin. An object of the present invention is to provide an aerosol can and a method for producing the same.

[0005]

Means for Solving the Problems In order to solve this problem, a first invention is an aerosol can in which a metal body is impact-molded and a can body and a can bottom are integrally formed. A can bottom base that rises at a fixed angle from a ground contact part that is continuous with the can body is formed, and on the lower surface of the can bottom base,
An annular bulge surrounded by a horizontal portion and a peripheral wall exhibiting an undercut is formed, and a recess surrounded by the bulge is formed in the center of the lower surface of the bottom of the can, and the top surface of the recess is formed. The second invention is characterized in that a body portion, a substantially horizontal annular can bottom base continuous with the body portion, and the can portion are formed by impact molding. Forming a can bottom having an annular bulge protruding downward from the bottom base and a recess at the center of the bottom surface surrounded by the bulge, and then raising the can bottom base at a certain angle. The outer surface side of the bulging portion is made a horizontal portion, and the peripheral wall on the inner surface side of the bulging portion has an undercut having a fixed inclination angle. A method for producing an aerosol can characterized by forming a valve hole in a surface A.

[0006]

The operation of the present invention having the above configuration will be described. In this aerosol can, when the bottom of the thin wall formed by impact molding is raised to a height at which the valve body can be mounted, the base of the can bottom is located at an angle θ inward with respect to the can body. Then, the bulging portion and the concave portion are lifted inward of the can, and at the same time, a horizontal portion is formed in the bulging portion, and an undercut is formed on the peripheral wall at an angle θ.

[0007]

FIG. 1 is a sectional view showing an aerosol can 1 according to a first embodiment of the present invention. The first invention is an invention of the aerosol can 1 itself having a can bottom 5 shape as shown in FIG. In the first invention, a can bottom base 4 is set up at an angle θ from the ground portion 3 continuous to the can body 2 to the inside of the can.
The angle θ is preferably 10 ° to 45 °, and θ can be freely determined depending on the can diameter, the height and size of the valve body to be mounted.

The horizontal portion 6 is formed on the bottom surface of the bulging portion 10 formed below the can bottom base 4, so that the valve body 1
After mounting 1, the horizontal portion 6 can secure a sufficient area on which the protective seal 12 can be attached (see FIG. 3A). Further, the recess 8 is located above the ground contact portion 3, and the peripheral wall 9 forms an undercut at an inclination of the angle θ. Then, after the valve body 11 is mounted, the protective cap 13 can be securely mounted in the recess 8 using the undercut 9 (see FIG. 3B). Note that the depth of the recess 8 is determined by the valve body 11.
The skirt portion 11a is formed in consideration of the height of the valve body 11 so as not to protrude downward from the horizontal portion 6 of the bulging portion 10.

FIG. 2 is a sectional view showing a second invention which is a method for manufacturing an aerosol can according to the present invention. FIG.
(A) and (b) are sectional views showing an embodiment of the second invention. FIG. 2A is a sectional view showing a can bottom 5 of the aerosol can 1 obtained by impact-molding aluminum slag. As shown in FIG.
And the can bottom 5 are formed so as to form a substantially right angle, and at the same time, a bulging portion 10 protruding downward and a recess 8 surrounded by the bulging portion 10 are formed simultaneously on the lower surface 5a of the can bottom base 4. . The bulging portion 10 projects outward at an angle θ.

Next, using a bottom-up mold (not shown),
As shown in FIG. 2B, the can bottom 5 is pressed in the direction of the arrow to raise the bottom. By this raising process, the can bottom base 4 is tilted inward from the horizontal state by an angle θ. Thereby, the horizontal portion 6 is formed on the bottom surface of the bulging portion 10, and the undercut is formed on the peripheral wall 9 surrounded by the bulging portion 10 at an angle θ. At the time of impact molding or raising the bottom, a valve hole 7 is formed in the top surface of the recess 8.

As shown in FIGS. 3 (a) and 3 (b), a valve body 11 is mounted in the valve hole 7 in the can bottom 5 of the aerosol can 1 manufactured by such a manufacturing method. A protection seal 12 for protecting the valve element 11 is attached to the lower horizontal portion 6 (FIG. 3A) or the undercut peripheral wall 9.
The protective cap 13 is attached to the peripheral wall 9 by using (FIG. 3B).

[0012]

As described above, according to the present invention, the amount of metal material at the bottom of the aerosol can can be reduced, and a protective seal can be applied to an aerosol can having a small can diameter. A sufficient horizontal portion can be secured at the bottom of the can, and an effect that secure and easy mounting of the protective cap can be ensured.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a first invention of an aerosol can according to the present invention.

FIG. 2 is a sectional view showing a second invention which is a method for manufacturing an aerosol can according to the present invention.

FIG. 3 is a cross-sectional view of a case where a valve body is mounted on the bottom of the aerosol can according to the present invention and a protective seal or a protective cap is mounted.

FIG. 4 is a sectional view showing a can bottom of a conventional aerosol can.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Aerosol can 2 Can body 3 Ground part 4 Can bottom base 5 Can bottom 6 Horizontal part 7 Valve hole 8 Depression 9 Peripheral wall 10 Swelling part

Claims (2)

(57) [Claims] 1. An aerosol can in which a metal body is subjected to impact molding to form a can body and a can bottom integrally, wherein the can bottom rises at a predetermined angle from a ground contact portion continuous with the can body. A base portion is formed, and on the lower surface of the can bottom base portion, an annular bulged portion surrounded by a horizontal portion and a peripheral wall exhibiting an undercut is formed, and at the center of the lower surface of the can bottom is surrounded by the bulged portion. An aerosol can having a recess formed therein, and a valve hole formed in a top surface of the recess. 2. A body, a substantially horizontal annular can bottom base continuous with the body, an annular bulge protruding downward from the can bottom base, and a bulge formed by the impact molding. Forming a can bottom with a recess at the center of the bottom that is enclosed, and then subjecting the bottom of the can to raising the base at a certain angle,
The outer surface of the bulging portion is made a horizontal portion, and the inner peripheral wall of the bulging portion has an undercut having a constant inclination angle, and a valve hole is formed in the top surface of the recess at the time of impact molding or raising the bottom. A method for producing an aerosol can.