JP5835568B2 - Aerosol container, bead part forming tool thereof, and aerosol container manufacturing method - Google Patents

Description

  The present invention relates to an aerosol container, a bead part forming tool thereof, and an aerosol container manufacturing method, and in particular, an aerosol container capable of eliminating pseudo-leakage in hot water inspection after filling the aerosol container, its bead part forming tool, and a method of manufacturing the aerosol container About.

  Conventionally, in a manufacturing process of an aerosol product, a hot water inspection is performed as a leakage inspection of contents after filling and sealing a gas as a propellant in a can filled with the contents. In this hot water test, although it is not actually leaking, pseudo leak (when filling the aerosol container, the gas that entered the bead part escapes during the hot water test and is detected as a bubble, as if the clinch part (sealed part) In the production of aerosol products, there is a possibility that bubbles are generated due to a phenomenon that appears to have caused gas leakage) and erroneously detected as a leaked product. It is an important technical issue.

  Pseudo-leakage can be removed by the time the gas that has entered the bead portion during gas filling reaches the hot water inspection process (approximately 15 seconds after gas filling sealing in the normal manufacturing process). This can be eliminated by increasing the gap with respect to the surface so that gas can easily escape. However, if the gap at the bead portion is increased, deformation due to pressure during clinching of the mountain cup increases, which causes leakage due to bead deformation. Therefore, in order to prevent pseudo-leakage, it is required to increase the clearance between the outer peripheral surface of the lid lid and the bead portion while maintaining the pressure resistance and sealing performance of the bead portion during clinching. Conventionally, as means for eliminating pseudo leakage of an aerosol container, a gap is formed between the shoulder portion by forming the tip of the bead portion as a whole with a land and a valley portion (see Patent Document 1), or a bead. It has been proposed to intermittently form a concave portion in the radial direction at the outer peripheral position of the shoulder portion facing the curl tip of the portion (see Patent Document 2, particularly FIGS. 2 and 3).

Japanese Utility Model Publication No. 47-4796 JP-A-08-295377

  According to the above-mentioned conventionally proposed means, it is possible to eliminate the pseudo leakage, but there are problems to be solved as described below, which are not yet satisfied. That is, in Patent Document 1, the main purpose is to reinforce the curl so as not to cause distortion when the valve cap is wound. However, after the lid opening end is formed to be uneven in the radial direction, further curling is performed. Therefore, the number of steps increases and it is difficult to process into a stable shape, and the material is easily damaged by processing, and there is a possibility that the sealing performance by the clinch of the mountain cup is impaired. In addition, there is a problem that repetition of unevenness is conspicuous from the appearance. On the other hand, in the case of Patent Document 2, an outer tool and an inner tool that are displaced in the radial direction are required for forming the recess, which increases the cost of manufacturing equipment. It must be pushed in the central direction, or the part that becomes the shoulder part must be expanded radially outward, or both, and in any case, either by radial reduction or expansion There is a problem that the manufacturing process becomes complicated. In that case, when only one tool is used, it is difficult to form a complete recess, and in order to form a good recess, the recess or shoulder is corrected once after forming (reverse processing). Is required. As a result, since the shoulder portion of the eyelid lid is repeatedly processed by a tool to form a recess, there is a risk of damage to the metal material on the inner surface of the shoulder portion or damage to the painted paint. Moreover, since the uneven | corrugated processed part given to the curl part for the conventional pseudo-leak prevention is exposed outside, there existed a possibility of impairing appearance.

  Therefore, the present invention is intended to solve the above-mentioned problems, the gas from the bead portion can be completely removed before the hot water inspection, and the pseudo leak can be eliminated. Can be processed with simple tool changes, the burden on the coating material of the lid material is small, the degree of exposure of the uneven processing part to the outside is small, and the sealing tool has excellent sealing performance and a forming tool for bead processing And it aims at providing the manufacturing method of an aerosol container.

The aerosol container of the present invention that solves the above problem is an aerosol container that is attached by clinching a mountain cup to a bead portion formed at an open end of an aerosol container body,
The bead portion includes a closed portion where the tip of the bead portion is in contact with the bead start portion in a state where the mountain cup is clinched, and a swell portion that partially forms a degassing gap between the closed portions. ,
The swell portion is recessed toward the inside of the bead portion, and forms a curl direction curve surface in which a cross-sectional shape of at least a circumferential central portion is a curved surface along a clothoid curve, and the curl direction curve surface It is characterized by having a shape that is connected to the closed portion by a circumferential curved surface that smoothly changes in the circumferential direction .
In the present invention, the opening end of the aerosol container body refers to an opening end that forms a bead portion for clinching the mountain cup, and is not limited to the case where the bead portion is formed directly on the opening end of the trunk portion. The opening end of the eyelid lid is also included in the case where the bead portion is formed at the opening end of the eyelid lid by winding the eyelid lid.

The swell portion is recessed by 5.0 μm or more toward the inside of the bead portion from the virtual circle drawn by the bead tip edge of the closed portion of the bead portion. The gas is surely released and the pseudo leak phenomenon can be prevented. 4. If the indentation of the bead tip edge to the inside of the bead portion is less than 5.0 μm or less, the outflow of gas from the inside of the bead portion is delayed, and the outgassing from the bead portion is not sufficient until the hot water inspection step. A dent of 0 μm or more is required. In addition, this dent becomes a clearance of 5.5 μm or more in a state where the mauten cup is clinched. Further, the upper limit of the dent is not particularly limited as long as the mountain cup is not conspicuous in the clinched state and the sealing performance due to deformation against the pressure at the time of clinching is not impaired, but practically 800 μm or less, preferably 400 μm or less is desirable. .
Further, the number and arrangement of the waviness portions are not particularly limited, but it is desirable to form 2 to 6 in the circumferential direction.

The bead part forming tool of the present invention that solves the above problems is a tool for forming a bead part of an aerosol container,
It has a curved molding surface for shaping the bead portion by pressing the upper end of the bead forming wall that rises vertically from the upper opening of the aerosol container and bending the bead forming wall.
The curved molding surface is composed of a closed molding surface in which a main molding surface in a curl direction cross section has an arc portion, and a waviness molding surface that is partially convex outward in the circumferential direction from the closed molding surface,
The swell portion molding surface is a clothoid curve surface in which at least the main molding surface in the curl direction section of the central section in the circumferential direction is a clothoid curve along the clothoid curve, and the circumferential center portion is most convex in the radial direction. The curvature radius of the central portion of the closed portion molding surface is the radius of curvature of the central portion of the closed portion molding surface. It is characterized by being consistent with .

Furthermore, the method for manufacturing an aerosol container of the present invention that solves the above-described problems is characterized in that a mountain cup is attached to a bead portion formed at an open end of an aerosol container body using the aerosol container bead portion forming tool according to claim 4. A method of manufacturing an aerosol container to be clinched and attached,
A bead forming step of forming the bead part by pressing the bead part forming tool against the upper end of the bead forming wall rising vertically from the upper opening of the aerosol container and curving and deforming the bead forming wall in a curled shape;
In the bead forming step, the bead forming wall is formed in a curled shape while forming a wavy part in which a part of the bead forming wall is recessed inward, and the bead forming wall is clinched in a mountain cup state. And forming the closing part that forms the closing part in which the tip of the contact part contacts the bead starting part in the same process,
In the swell portion molding, a curl direction curved surface having a cross-sectional shape that is a curved surface along a clothoid curve is formed at least in the central portion in the circumferential direction, and smooth in the circumferential direction from the curled direction curved surface to the closed portion. The swell portion is formed in a shape connected by a curved surface in the circumferential direction that changes to the shape, and is formed so that the radius of curvature of the central portion in the circumferential direction matches the radius of curvature of the central portion of the closed portion molding surface. It is characterized by this.

  According to the aerosol container of claim 1, in the aerosol product in which the mountain cup is clinched and sealed after filling the contents, the undulation portion of the bead portion is surely vented between the bead start portions facing the bead tip portion. A gap for use is formed, so that the gas in the bead portion can be surely removed before the hot water inspection, and pseudo leakage can be eliminated. The wavy portion from which the gas escapes is easy to mold and is located inside the bead portion, so that it does not stand out in appearance and has substantially the same appearance as the closed portion, and a good appearance can be obtained.

Aerosol container according to claim 1, further added to the above effects, undulation unit, because the cross-sectional shape of a circle circumferentially central portion main section is in the curved surface along the clothoid curve, largely bent gently Since the undulation portion forms a gap, the undulation portion can be reliably formed without fear of damaging the bead portion during molding.
According to the configuration of claim 2 , the gas venting gap is surely formed in the undulating portion, the gas in the bead portion can be surely vented before the hot water inspection, and the pseudo leak can be more effectively eliminated. it can.
According to the aerosol container of the third aspect , by forming 2 to 6 swell portions in the circumferential direction, the gas escape gap can be formed with almost no swell portion conspicuous.

According to the bead part forming tool according to claim 4, it is possible to reliably form a bead part composed of a gently continuous closed part and a swell part having a gas venting gap without an extreme step in the circumferential direction. In addition, it can be easily molded in one step, and productivity can be improved.

According to the method for manufacturing an aerosol container of claim 5 , following the step of forming the bead forming wall that rises vertically from the upper opening of the aerosol container, the bead part forming tool is relatively stroked at the upper end of the bead forming wall. Since the bead forming wall can be formed almost simultaneously in one step by bending and deforming the bead forming wall by pressure contact, it can be easily formed in one operation and manufactured at low cost. Can do. And according to the manufacturing method of the present invention, since there is no deformation of the shoulder portion, the clinching of the mountain cup can be stably performed and high sealing performance is obtained, and damage to the metal material of the bead portion or the shoulder portion, Or there is no damage of the painted paint.

(A) is principal part sectional drawing in the state which attached the mountain cup to the bead part of the aerosol container which concerns on embodiment of this invention, (b) is an expanded sectional view of the axial direction cross section in the center position of a wave | undulation part. It is. It is sectional drawing of the eyelid lid in the AA arrow cross section in FIG. (A) is the BB sectional drawing in the same (b) of the bead part forming tool of the present invention, and (b) is the bottom view. (A) is sectional drawing of the waviness part shaping | molding surface of the bead part shaping | molding tool which concerns on embodiment of this invention shown in FIG. 3, (b) is sectional drawing of the obstruction | occlusion part shaping | molding surface. (A) is explanatory drawing of the curve of the waviness part shaping | molding surface of the tool shown to Fig.4 (a) based on embodiment of this invention, (b) is the curve of the obstruction | occlusion part shaping | molding surface shown in FIG.4 (b). It is explanatory drawing, (c) is the schematic diagram which overlapped both and compared the cross-sectional shape. (A)-(c) is a schematic diagram which shows the bead molding process in the manufacturing method of the aerosol container which concerns on embodiment of this invention.

Embodiments of an aerosol container, a bead part forming tool thereof, and a method for manufacturing the aerosol container according to the present invention will be described below in detail with reference to the drawings.
FIG. 1 is a cross-sectional view of a main part in a state where a mountain cup is attached to a bead portion of a lid of an eyepiece lid according to the aerosol container of the present invention. In this drawing, a valve member attached to the mountain cup is omitted. FIG. 2 is a state diagram of the bead portion from which the mountain cup is removed in the cross-section taken along the line AA in FIG.

  The aerosol container according to the present embodiment is either a can body in which a seamless body portion and a bottom portion are integrated, or a can body in which a bottom lid is wound around a body portion in which a side seam portion is joined by welding or bonding. The mountain cup to be attached to the opening may be a bead formed at the opening end of the eye lid that is wound around the opening of the body of the can body, or a neck-in processed opening of the can body. Any form clinched to the directly formed bead portion may be used. In the following embodiment, a case where the mountain cup is clinched to the bead portion formed on the eyelid lid will be described, but when the mountain cup is clinched to the bead portion formed on the narrowed portion of the opening end of the can body, In the following description, the lid of the eyepiece is replaced with the body throttle part. In addition, the main body of the aerosol container including the eye lid is called.

  The aerosol container 1 according to the embodiment shown in FIG. 1 shows a case where a lid (not shown) has a metal lid 2 wound around a welding can having a seam portion in the axial direction. A mountain cup 20 is clinched and attached to a bead portion 10 formed at an end. The above structure is the same as that of the prior art, but in the present embodiment, in order to eliminate the above-described pseudo leakage at the time of the hot water inspection, the gas enters the bead unit 10 from the gas filling to the hot water inspection. It is characterized in that the gap is formed as follows so that the gas automatically escapes to the outside.

  The bead portion 10 is an important part for clinching the mountain cup, and is formed to have a substantially arc cross section of one or more rounds from the bead start portion 11 continuing from the shoulder portion 3 of the eye lid 2 to the bead tip portion 12. The curl portion 21 of the mountain cup is in close contact with the compound 6 so that the gas does not escape from the inside of the container when the mountain cup 20 is clinched. The bead portion 10 in the present invention is substantially in contact with the bead start portion 12 or the bead start portion 11 facing the bead tip portion 12 in a state where the mountain cup 20 is clinched as shown in FIG. And a swell portion that is partially lifted on the circumference (three places at intervals of 120 ° in the illustrated embodiment) to form a degassing gap t. 14 is formed. The waviness portions 14 are desirably formed at 2 to 6 locations in the circumferential direction, and are preferably equally spaced, but not necessarily equally spaced.

The closed portion 13 is formed by curving the main portion of the cross section in the curl direction into an arc shape in which one or several curves of curvature radius are joined. The waviness portion 14 can form a gap once by using a smaller radius of curvature or by shifting its center position to form a stepped portion, but in that case, the gap between the closing portion and the waviness portion can be formed. The level difference becomes large, and it becomes difficult for the bead forming part at the opening end of the lid lid to completely follow the processing surface of the forming tool at the time of forming, resulting in problems such as forming distortion and causing cracks and processing flaws. Easy and poor appearance. As a result, the fitting with the mountain cup may be poor and the contents may leak, which is disadvantageous for practical use.
On the other hand, in order to press the mountain cup to the bead part well, the curvature radius of the step part is also blocked due to the dimensional restriction that the curvature radius of the bead part must match the curvature radius of the curl part of the mountain cup. It is necessary to have the same radius of curvature as the part.

  As a result of various researches to solve this problem, the present inventor has divided the molding surface for forming the step portion of the bead portion forming tool into 3 to 4 by curves having different curvature radii, and the central portion is divided into the blocking portion. Match with the radius of curvature, and make the curvature curve of the curve connected to it different to make a curved surface where the inflection point is gentle at the joint R. As an ideal form, a clothoid curve with the central part matched with the radius of curvature of the closed part By realizing the curved surface along the line, it was perceived that an uneven “undulation” can be generated in the bead portion to be molded that is difficult to visually distinguish, and the present invention has been achieved. As a result, no processing flaws were generated, and at least the central portion of the bead portion could be reliably degassed before reaching the hot water test.

Since the bead part of the shape of the aerosol container of the present invention is formed by a bead part forming tool, an embodiment of the bead part forming tool according to the present invention for realizing the above shape will be described based on the drawings. To do.
3 to 5 show a bead part forming tool according to an embodiment of the present invention, FIG. 3 (a) is a front sectional view thereof (BB sectional view of (b)), and FIG. It is a bottom view. FIG. 4 is an enlarged cross-sectional view of a bead portion molding surface, where (a) represents a swell portion molding surface and (b) represents a closed portion molding surface. Fig.5 (a) is explanatory drawing of the curve of the waviness part shaping | molding surface of the tool shown to Fig.4 (a) based on embodiment of this invention, (b) is the obstruction | occlusion part shaping | molding surface shown in FIG.4 (b). It is explanatory drawing of a curve, (c) is the schematic diagram which overlapped both and compared cross-sectional shape.

  The basic technical idea of forming a gas escape gap in the bead portion of the present invention is to change the diameter of the bead forming path of the bead portion forming tool in the radial direction with a plurality of circumferential portions as waviness forming portions. By using a gentle curved path having an inflection point where the center of the direction change portion is changed in the curl direction, a difference occurs between the material flow in the swell portion forming portion and the material flow in the closed portion forming portion. In this case, the bead tip is raised and the tip of the bead is raised to automatically form a gas escape gap in the bead forming step. The bead part forming tool is specifically configured as follows.

  The bead part forming tool 30 of the present embodiment has an annular curved forming surface 32 serving as a bead forming path at a lower end portion of a cylindrical tool body 31, and from an upper opening of an aerosol container (eye lid). The bead portion 10 is formed by bending and deforming the bead forming wall 5 in pressure contact with the upper end of the bead forming wall 5 (see FIG. 6) rising vertically. The curved molding surface 32 includes a closed portion molding surface 33 and a wavy portion molding surface 34 partially formed between the closed portion molding surface in the circumferential direction. The molding surface of the closing portion molding surface 33 is composed of a main molding surface in a cross section in the curl direction having an arc portion (in this embodiment, a connecting arc of R1 and R4, but only a single R1 may be used). It is connected to an introduction surface and a flank surface having different predetermined curvatures. The curvature radius R1 varies depending on the product. In addition, although the center part of the wave | undulation part shaping | molding surface mentioned later is also formed with the same curvature radius R1, as shown in FIG.5 (c), the shaping | molding surface of the obstruction | occlusion part shaping | molding surface 33 is dented rather than the wave | undulation part shaping | molding surface 34. To do.

On the other hand, curve molding surface of the undulation portion forming surface 34, which has at least a main molding surface of the curl direction cross section of the main section of the circle circumferentially central portion, the inflection point where the curvature radius is gently connected to different arcs It is formed on a curved surface, specifically a clothoid curved surface, which will be described later, and the curved surface before and after the curling direction is connected by different Rs which become the introduction surface and the flank surface in the same manner as the closed portion. Then, the circular circumferential cross-sectional shape of the curved shaping surface 32, the most projected central portion in the radial direction of the undulation portion forming surface 34, smoothly so as to connect the closed portion forming surface 33 gently changes from the central portion It is connected with a curved surface.

In order to obtain a curve having a gentle inflection point by connecting the arcs having different curvatures, it can be obtained more favorably by using a clothoid curve as a base. For example, in the case of 3 divisions R, the clothoid curve is enlarged and reduced in a similar manner, and dimensionless in the equation of the clothoid curve so that R1 having the same curvature as R1 of the closed portion forming surface is aligned with the bead portion forming tool. The clothoid curve is obtained by setting the Y1 value with the converted coordinates (X, Y). At that time, it is important that the curvature of the central portion of the undulation portion molding surface is the same as the curvature of the central portion of the closing portion molding surface. In accordance with the clothoid curve obtained in this way, the main section of the waviness forming surface is divided into three parts, the center part is set to R1, and the center part and the other two places are set to the curvature radii R2 and R3 along the clothoid curve. Set. The circumferential width of the curled surface along the clothoid curve of the waviness forming surface may be linear, but a certain width is preferable for securing the product shape.

With the bead part forming tool 30 having the molding surface as described above, the bead part of the lid is formed as follows by the process shown in FIG.
In the eyelid lid manufacturing process according to the embodiment of the method for manufacturing an aerosol container of the present invention, following the step of projecting and forming the bead forming wall 5 in a cylindrical shape at the opening end of the eyelid lid 2, the bead forming wall 5 is formed. A bead forming step of forming a bead portion with the bead portion forming tool 30 is provided. In the bead forming step, either or both of the lid lid 2 and the bead part forming tool 30 supported by the lower mold are relatively displaced (stroked) in the axial direction (pressure contact direction). A part (top end) of the upper end of 5 hits the undulation portion forming surface 34 of the forming tool, and only this portion is formed first, and the formation of the undulation portion forming surface 34 is started. The waviness forming surface is formed with the main section of the processed surface along the clothoid curve as described above, so that the bead is formed as compared with the closed portion formed of one R or a plurality of R simple combination curve surfaces. The formation path changes slowly. As a result, the material surely flows along the bead formation path and is pressed against the molding surface to be molded, and it is possible to suppress the occurrence of cracks and scratches on the material during processing. Further, as the stroke progresses, the opening end portion that becomes the closing portion of the eyelid lid hits the closing portion forming surface 33 of the forming tool, and bead forming of the closing portion starts, and the bead is formed while the inner recess is formed in the bead shape. The As a result, the bead is formed while the bead tip is waved, the bead tip is raised, and a gas escape gap is formed. Therefore, the bead portion including the closed portion and the swell portion can be formed only by the relative one-stroke displacement between the bead portion forming tool 30 and the bead forming wall 5 of the container body.

The tip of the bead portion of the eyelid lid 2 according to the present embodiment formed as described above forms a gap of 5.5 μm or more with the bead start portion even after the container is filled with the content liquid and clinched. Can prevent false leakage. In addition, since there is almost no gap between the bead tip and the bead start portion in the closed portion, the mountain cup is accurately clinched and a complete sealing property can be secured. Furthermore, since the undulation portion uses the division R along the clothoid curve, the cross section and the circumferential direction have a smooth shape, and there is an effect that it is difficult to be damaged.
Note that the mountain cup can be clinched to the lid of the eyepiece in the same manner as in the past. For example, the mountain cup is clinched with a collet claw of the crimper.

  The curved molding surface 32 of the bead portion molding tool 30 is set such that the central molding surface of the closing portion molding surface 33 has a curvature R1 = 1.44 mm, the upper side thereof has a curvature R4 = 1.75 mm, and the central molding surface of the undulation portion molding surface 34. The swell portion molding surface 34 is formed by a clothoid curve so that the central portion thereof has a different curvature of R1 = 1.44 mm, the upper side thereof has a curvature R3 = 1.24 mm, and the lower side thereof has a curvature R2 = 2.75 mm. A bead portion was formed on the bead forming wall of the lid of a tin side seam welded aerosol can having a can diameter of 60.2 mm using three bead portion forming tools 30 formed at intervals of °°. The obtained lid lid was wound around the can body to obtain an aerosol container body. After filling the contents and filling the gas, the mountain cup was clinched and sealed.

In the said Example, the maximum value was 10 micrometers as a result of measuring the level | step difference of the adjacent wave | undulation part and obstruction | occlusion part before a mountain cup clinching.
And after mountain cup clinching, as a result of measuring the level | step difference of the adjacent wave | undulation part and obstruction | occlusion part similarly to before clinching, the maximum value was 12 micrometers.
Since it has been confirmed that if the gap is 5.5 μm or more, it is possible to prevent the gas inspection pseudo-leakage from coming out of the bead portion before reaching the hot water inspection step, according to the above embodiment, the gap in the swell portion can be reliably ensured. It was confirmed that an aerosol container capable of preventing pseudo leakage can be obtained.
In addition, the waved portion of the obtained aerosol container (eyepiece lid) has a smooth shape in both the cross section and the circumferential direction, and is smoothly connected to the closed portion to obtain an aerosol container having a shape with almost no irregularities from the appearance. I was able to.

  INDUSTRIAL APPLICABILITY The present invention can be employed in aerosol containers filled with various contents, can eliminate pseudo-leakage, and can be manufactured at a low cost, and thus has high industrial applicability.

DESCRIPTION OF SYMBOLS 1 Aerosol container 2 Metal lid 3 Shoulder part 5 Bead formation wall 6 Compound 10 Bead part 11 Bead start part 12 Bead tip part 13 Closure part 14 Wave part 20 Mountain cup 21 Curl part 30 Bead part shaping tool 31 Tool main body 32 Curve molding Surface 33 Blocking portion molding surface 34 Waviness portion molding surface

Claims (5)

An aerosol container attached by clinching a mountain cup to a bead portion formed at an open end of an aerosol container body,
The bead portion includes a closed portion where the tip of the bead portion is in contact with the bead start portion in a state where the mountain cup is clinched, and a swell portion that partially forms a degassing gap between the closed portions. ,
The swell portion is recessed toward the inside of the bead portion, and forms a curl direction curve surface in which a cross-sectional shape of at least a circumferential central portion is a curved surface along a clothoid curve, and the curl direction curve surface An aerosol container having a shape that is connected to the closed portion by a circumferentially curved surface that smoothly changes in the circumferential direction .   2. The aerosol container according to claim 1, wherein the swell portion is recessed 5.0 μm or more toward the inside of the bead portion from a virtual circle drawn by a bead tip edge of the closed portion of the bead portion.   The aerosol container according to claim 1, wherein 2 to 6 swell portions are formed in a circumferential direction. A tool for forming a bead portion of an aerosol container,
It has a curved molding surface for shaping the bead portion by pressing the upper end of the bead forming wall that rises vertically from the upper opening of the aerosol container and bending the bead forming wall.
The curved molding surface is composed of a closed molding surface in which a main molding surface in a curl direction cross section has an arc portion, and a waviness molding surface that is partially convex outward in the circumferential direction from the closed molding surface,
The swell portion molding surface is a clothoid curve surface in which at least the main molding surface in the curl direction section of the central section in the circumferential direction is a clothoid curve along the clothoid curve, and the circumferential center portion is most convex in the radial direction. The curvature radius of the central portion of the closed portion molding surface is the radius of curvature of the central portion of the closed portion molding surface. A tool for forming a bead part of an aerosol container, characterized in that An aerosol container manufacturing method for clinch mounting a mountain cup on a bead part formed at an open end of an aerosol container body using the aerosol container bead part forming tool according to claim 4 ,
A bead forming step of forming the bead part by pressing the bead part forming tool against the upper end of the bead forming wall rising vertically from the upper opening of the aerosol container and curving and deforming the bead forming wall in a curled shape;
In the bead forming step, the bead forming wall is formed in a curled shape while forming a wavy part in which a part of the bead forming wall is recessed inward, and the bead forming wall is clinched in a mountain cup state. And forming the closing part that forms the closing part in which the tip of the contact part contacts the bead starting part in the same process ,
In the swell portion molding, a curl direction curved surface having a cross-sectional shape that is a curved surface along a clothoid curve is formed at least in the central portion in the circumferential direction, and smooth in the circumferential direction from the curled direction curved surface to the closed portion. The swell portion is formed in a shape connected by a curved surface in the circumferential direction that changes to the shape, and is formed so that the radius of curvature of the central portion in the circumferential direction matches the radius of curvature of the central portion of the closed portion molding surface. The manufacturing method of the aerosol container characterized by the above-mentioned .

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