JP5846349B2 - Method for manufacturing aerosol container - Google Patents

Description

  The present invention relates to an aerosol container and a method for manufacturing the same, and more particularly to an aerosol container capable of eliminating pseudo-leakage in a hot water inspection after filling the aerosol container and a method for manufacturing the same.

  Conventionally, in a manufacturing process of an aerosol container, a hot water inspection is performed as a leakage inspection of a content after high-pressure filling and sealing of a gas as a propellant into a can filled with the content. In the hot water inspection, the aerosol container filled and sealed with the contents is transported while submerged in the warm water in the hot water tank. If there is a leak, bubbles are generated in the water from the aerosol container. It is a method to do. By the way, in the hot water inspection, there is a phenomenon in which bubbles are generated due to pseudo leakage even though it is not actually leaking, and in the hot water inspection of the aerosol container, it is a technical problem to eliminate the pseudo leakage phenomenon. Pseudo-leakage is a phenomenon in which when gas is filled into an aerosol container, the gas that has entered the bead part is detected as a bubble through the hot water test and appears as if it has leaked from the clinch part (sealed part).

  The pseudo-leakage may be released until the gas that has entered the bead portion at the time of gas filling reaches the hot water inspection process (about 15 seconds after gas filling sealing in a normal manufacturing process). This can be solved by increasing the gap so that the gas can easily escape. However, if the gap in the bead portion is increased, the deformation due to the pressure during clinching of the mountain cup increases, causing leakage due to bead deformation. Therefore, in order to prevent pseudo leakage, it is required to increase the gap between the outer surface of the canopy and the bead part while maintaining the pressure resistance and sealing performance of the bead part 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 conventionally proposed means, it is possible to eliminate the pseudo-leakage, but the conventional technique has the following problems to be solved and is not yet satisfied. In other words, the former needs to be further curled after forming the lid opening end in the radial direction in a wavy shape, so that it is difficult to process the shape into a stable shape, and the problem of impairing the sealing performance by the clinch of the mountain cup is lost. is there. In the latter case, 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 the manufacturing equipment. Must be pushed into the shoulder, or the shoulder portion must be expanded radially outwardly, or both, and in any case, not reduced radially or expanded However, there is a problem that the manufacturing process becomes complicated. In that case, when only one of the tools is used, it is difficult to form a complete recess. Therefore, in order to form a favorable recess, correction processing (returning) of the recess or shoulder is required at the time of sealing. As a result, the shoulder portion of the canopy is repeatedly processed by a tool in order to form a concave portion, which may cause damage to the metal material on the inner surface of the shoulder portion or damage to the painted paint.
Therefore, the present invention is intended to solve the above-mentioned problems, and gas leakage from the bead portion can be completely eliminated until the hot water inspection is completed, and pseudo leakage can be eliminated. It can be processed in a simple change of the line, and an object thereof is to provide a method for manufacturing an aerosol container burden excellent small sealed against paint and the like of the lid.

The method for manufacturing an aerosol container according to the present invention for solving the above-described problem is a method for manufacturing an aerosol container that is attached to a bead portion formed at an open end of an aerosol container body by clinching a mountain cup, the shoulder of the aerosol container body One or more axial recesses are formed by a lower die and an upper die at a connection base with the shoulder end of the bead forming wall in a state where a cylindrical bead forming wall is vertically extended from the end of the portion. A step of curling the bead forming wall to form a bead portion, a step of clinching a mountain cup to the bead portion with a crimper,
The upper mold has an opening having a diameter substantially the same as the outer diameter of the bead-forming wall at the center, and an annular recess for forming a bead start portion of the canopy is formed at an opening edge of the upper mold. An annular convex portion corresponding to the annular concave portion of the mold, and at least one groove is formed in the annular convex portion, and the connecting base portion of the bead forming wall is axially disposed between the lower die and the upper die. By pressurizing from above, the inner peripheral edge of the connection base is pushed up by the annular convex portion to form a bead start portion of the canopy, and an axial concave portion for venting is formed at a position corresponding to the groove of the lower mold. It is characterized by becoming like this.

  According to a fourth aspect of the present invention, in the method for manufacturing an aerosol container according to the third aspect, the upper mold has an opening having a diameter substantially equal to the outer diameter of the bead-forming wall at the center, and the opening edge thereof. An annular recess for forming a bead start portion of the canopy is formed, and the lower mold has an annular projection corresponding to the annular recess of the upper mold, and the annular projection has one or more grooves crossing it. The lower base and the upper mold pressurize the connection base of the bead forming wall from the axial direction to push up the inner peripheral edge of the connection base with the annular protrusion, thereby forming the bead start of the canopy. In addition, an axial recess for venting gas is formed at a position corresponding to the lower groove.

According to the aerosol container manufactured by the manufacturing method of the present invention , the bead start portion is formed with an axial recess for degassing, so that the bead end end facing the bead start portion at the closest distance, A gap is formed between the bead start portion and the gas easily escapes, and the gas accumulated in the bead portion before the hot water test is released, so that pseudo leakage does not occur. Since the degassing recess is an axial recess at the bead starting portion, it can be easily formed in one step, can be manufactured at low cost, and does not involve deformation of the shoulder portion. The clinching can be stably performed, and high sealing performance can be obtained, and there is no damage to the paint metal material in the bead portion or the shoulder portion or damage to the painted paint. Moreover, since the said axial direction recessed part is formed in the bead start part in a bead part, it does not stand out on an external appearance and does not impair an external appearance.
Further, the gas from the bead portion can be more efficiently removed, and the mountain cup clinches can be made uniform in the circumferential direction, thereby obtaining a more stable one.

According to the method for manufacturing an aerosol container according to the present invention, a cylindrical bead forming wall is formed to extend vertically from the shoulder end of the aerosol container body, and the shoulder end of the bead forming wall is formed. Since one or more axial recesses can be formed in the connection base by the lower mold and the upper mold, the upper mold and the lower mold can be manufactured at low cost by simply remodeling the conventional shoulder container remodeling mold. be able to. Further, the axial recess can be easily formed by only one stroke of the lower mold and the upper mold.
Furthermore, since the axial concave portion of the bead start portion is formed by a groove formed in the upper annular convex portion, it can be easily set by the width / depth of the groove and the way of taking the radius, and the clearance dimension Can be set more optimally.

(A) is principal part sectional drawing in the state which mounted | wore the bead part of the aerosol container which concerns on embodiment of this invention with the valve mountain cup, (b) is an expanded sectional view of the axial recessed part position. (A)-(c) is process drawing which forms an axial recessed part in a canopy. The lower type | mold for axial direction recessed part formation which concerns on embodiment of this invention is shown, (a) is a top view, (b) is the AA cross-sectional arrow view. It is a process figure which clinches a mountain cup to a bead part concerning an embodiment of the present invention with a collet nail, (a) is a state of a BB section position in Drawing 5 (a) before clinching start, (b) is a clinching. The state after the end is shown. It is a schematic diagram which shows the arrangement | positioning of the clearance gap of a bead part and the collet nail | claw tip part in the aerosol container which concerns on embodiment of this invention, (a) is a case where there are six collet claws, and (b) is a case where there are eight. Show.

Embodiments of an aerosol container manufacturing method 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 mounted on a bead portion of an aerosol container manufactured by the method for manufacturing an aerosol container of the present invention. In this drawing, a valve member attached to the mountain cup is omitted. The aerosol container according to the present embodiment may be either a two-piece can in which the body portion and the bottom portion are integrated, or a three-piece can in which the bottom portion is wound around the body portion, and is attached to the opening. The mountain cup may have any form in which the mountain cup is clinched to the bead portion formed at the opening end of the canopy (eye lid) or the bead portion directly formed to the opening portion of the drawn body portion. . In the following embodiment, a case where a mountain cup is clinched to a bead portion formed on a canopy will be described, but when a mountain cup is clinched to a bead portion formed at a throttle portion at the opening end of a can body, In the description, it is assumed that the canopy is read as the body throttle part.

  The aerosol container 1 of the embodiment shown in FIG. 1 shows a case where a canopy 2 is double-rolled around a three-piece can having a trunk (not shown) having a seam portion in the axial direction, and is formed at the open end of the canopy. A mauten cup 10 is clinched and attached to the bead portion 3 by a method described later. The above structure is the same as that of the prior art. However, in this embodiment, in order to eliminate the above-described pseudo leakage during the hot water inspection, the gas that has entered the bead portion from the gas filling to the hot water inspection is removed. It is characterized in that the concave portion formed so as to be automatically pulled out is devised as follows.

  The bead part 3 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 part 5 continuing from the shoulder part 4 of the canopy 2 to the bead end end 6, The curl portion 11 of the mountain cup is in close contact so that gas does not escape from the inside when the mountain cup is clinched. In the present invention, as shown in an enlarged view in FIG. 1 (b), the bead start portion 5 and the position facing the bead end portion 6 located at the closest distance in the axial direction to the bead start portion 5 By forming one or more, preferably a plurality of axial recesses 7 at regular intervals in the shape, and providing gaps t in the axial direction, gas can be easily released from the bead portion 3 while maintaining hermeticity. It is a thing. In the figure, reference numeral 15 denotes a sealing material for sealing the clinch portion.

  In the cross-sectional view of FIG. 1A, the left bead portion 3 has an axial recess 7 formed in a portion facing the bead end end 6 side, and a distance t between the bead end end 6 and the axial recess 7. A gap is formed, and on the right side, there is no axial recess 7 and a cross-sectional state of a portion where the bead end 6 and the bead start 5 are in contact with each other is shown. In the present embodiment, five axial recesses 7 are formed at equal intervals in the circumferential direction. And since the axial direction dent 7 is a fine dent and is in the position which opposes the bead end 6, it is hardly conspicuous in appearance.

  In the illustrated embodiment, the bead end 6 is the shortest axial distance from the bead start 5, and the bead end 6 and the shortest axial position of the bead start 5 are aligned. However, the present invention is not necessarily limited thereto, and when the bead portion 3 is formed by curling multiple times and the end end 6 is positioned inside the bead portion 3, the bead having the shortest axial distance from the bead end end 6 is provided. This is different from the position at the end 6 side.

Next, the manufacturing method of the aerosol container of the above structures is demonstrated based on FIGS.
FIG. 2 is a process diagram for forming the axial recess 7 in the canopy 2. In this embodiment, the process is performed simultaneously with the opening forming process for the top of the canopy 2. The canopy 2 in the state of FIG. 2 (a) is a metal disk press-molded into a cross-sectional shape as shown in the figure. A bead-forming wall 8 rises vertically from a shoulder 4 in a cylindrical shape, and has an upper end surface. Is in a blocked state. The mold for forming the axial recess 7 includes an upper mold 20, a lower mold 30, and a support member 40, and has an outer diameter equal to the inner diameter of the punch 41 for punching the upper end surface and the bead forming wall 8. And a die member 42 having the same.

  The upper mold 20 has an opening surface 21 having an inner diameter equal to the outer diameter of the bead forming wall 8 of the canopy 2 at the center, and an annular recess 22 for forming the bead start portion 5 is formed on the lower end surface thereof. The annular recess 22 is formed deeper than at least the axial recess 7 formed in the canopy 2 and is located at a position corresponding to the connection base 9 between the lower end of the bead forming wall 8 and the shoulder 4 of the canopy 2. Below the annular recess 22 is an upper mold side shaping surface 23 having a shape along the shoulder of the canopy, and the lower mold side shaping surface 34 and the canopy 2 which will be described later are also reformed at the same time.

On the other hand, details of the lower mold 30 are shown in FIG. FIG. 3A is a plan view, and FIG. 3B is a cross-sectional view taken along the line AA.
The lower die 30 has a through hole 31 having an inner diameter substantially equal to the inner diameter of the bead forming wall 8 at the center thereof, and an annular convex portion 32 that faces the annular concave portion 22 of the upper die 20 is formed on the opening end surface of the top portion. Has been. A plurality of grooves 33 (shown by hatching in FIG. 3A) are formed in the annular convex portion 32 so as to cross the portion in the radial direction. In the present embodiment, five grooves 33 are formed in the annular convex portion 32 at equal intervals, but at least one groove is sufficient, and the number is arbitrary. The depth T and the circumferential length L of the groove 33 define the shape of the axial recess 7 formed in the bead portion 3 and are designed corresponding to the axial recess 7 formed.

  As shown in FIG. 2A, the canopy 2 is set in the mold having the above-described structure, and the upper mold 20 and the punch 41 are relatively lowered from this state. 21 moves along the outer peripheral surface of the bead forming wall 8, and the shaping surface 23 comes into contact with the shoulder 4 of the canopy 2 ((b) in the figure). At the same time, the upper end surface of the canopy 2 is punched out with the punch 41 and the die member 42. In addition, in order to make it easy to punch the upper end surface of the canopy 2, the punched portion is score processed in the previous process. The upper mold 20 is further lowered so that the annular recess 22 of the upper mold 20 presses the connection base 9 against the annular protrusion 32 of the lower mold 30, so that the annular protrusion 32 of the lower mold 30 becomes the bead start portion 5 of the canopy 2. Is pushed up and shaped (FIG. 2 (c)). At that time, as a result of the material of the curled portion starting portion 5 not subjected to plastic deformation entering the groove 33 formed in the annular convex portion 32 of the lower mold 30, minute axial dents 7 having a predetermined interval are formed in the bead starting portion 5. Is done. At the same time, the shoulder 4 is reformed by the upper mold 20 and the lower mold 30. In FIG. 2C, reference numeral 35 denotes a punched piece.

  Next, although not shown, a bead process is performed on the curl forming wall 8 of the canopy 2 to form a bead part 3 and a double curling process is performed on the outer peripheral flange part to double-tighten the container body. A curling portion for winding is formed. Conventional methods can be used for the beading and curling.

  As described above, the mountain cup 10 is attached to the canopy 2 having the curl start portion 5 formed with the axial recess 7 by the method shown in FIGS. FIG. 5 schematically shows a planar arrangement relationship between the collet claw tip 51 and the gap area of the bead 3 of the canopy 2, and an axial recess 7 is formed in the gap area. As the collet claw 50, a crimper having an arbitrary number of collet claws 50 such as six claws as shown in FIG. 5A or eight claws shown in FIG. 5B can be adopted. In the present invention, since the axial concave portion 7 is formed in the bead starting portion 5, the concave portion remains after clinching no matter where the collet claw 50 is located. I can do it.

  As shown in FIG. 4A, the clinch of the mountain cup 10 is expanded by inserting and expanding the collet claw 50 on the inner peripheral surface of the mountain cup 10 with the mountain cup 10 covered on the bead portion 3. As shown in FIG. 2B, the collet claw tip 51 pushes and expands the lower position of the curl portion 11 of the mountain cup 10 corresponding to the curl start portion 5 to clinch the mountain cup 10 to the bead portion 3 of the canopy 2. . At this time, since the corresponding wall of the mountain cup 10 is pushed into the curl start portion 5 by the collet claw tip 51, the axial recess 7 is slightly displaced in the axial direction, and the gap between the bead end 6 and the axial recess 7 is In the portion where the collet claw tip 51 does not contact, as shown on the left side of FIGS. 4A and 4B, the gap t after clinching is smaller than the gap t1 in the state before clinching, and the collet claw tip 51 As shown on the right side of the figure, the bead end 6 and the bead start portion 5 are substantially in contact with each other on the side where the bead contacts. Therefore, after clinching, the end end 6 of the bead portion 3 and the bead start portion 5 are in contact with each other except where the axial recess 7 is formed, so that a good bead shape can be obtained. As a result, an aerosol container having good gas escape and high sealing performance can be obtained.

  As described above, in this embodiment, the gap for degassing from the bead portion is formed as an axial dent in the bead start portion, so that the formation of the upper mold and the lower mold for reforming the canopy is simple. It can be made by remodeling and can be manufactured easily and inexpensively. In addition, mountain cup clinch to the canopy's axial recess can be ensured by simply expanding the collet claw, and without repeated deformation, the bead and shoulder metal materials are damaged or painted. Little effect on paints.

  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 Canopy 3 Bead part 4 Shoulder part 5 Bead start part 6 Bead end end 7 Axial direction dent 8 Bead formation wall 9 Connection base 10 Mountain cup 11 Curl part 15 Sealing material 20 Upper mold | type 21 Opening surface 22 Annular recessed part 23 Above Mold side shaping surface 30 Lower mold 31 Through hole 32 Annular convex 33 Groove 34 Lower mold side molding surface 35 Punched piece 40 Support member 41 Punch 42 Die member

Claims (1)

A method for manufacturing an aerosol container, wherein a mountain cup is clinched and attached to a bead portion formed at an open end of an aerosol container body, and a cylindrical bead forming wall is vertically extended from a shoulder end of the aerosol container body. A step of forming one or more axial recesses by a lower die and an upper die at a connection base portion with the shoulder end of the bead forming wall, and a step of curling the bead forming wall to form a bead portion. , Consisting of a step of clinching the mountain cup with a crimper to the bead part,
The upper mold has an opening having a diameter substantially the same as the outer diameter of the bead-forming wall at the center, and an annular recess for forming a bead start portion of the canopy is formed at an opening edge of the upper mold. An annular convex portion corresponding to the annular concave portion of the mold, and at least one groove is formed in the annular convex portion, and the connecting base portion of the bead forming wall is axially disposed between the lower die and the upper die. By pressurizing from above, the inner peripheral edge of the connection base is pushed up by the annular convex portion to form a bead start portion of the canopy, and an axial concave portion for venting is formed at a position corresponding to the groove of the lower mold. A method for producing an aerosol container, characterized by comprising:

Images