JP4274871B2 - Aerosol double container - Google Patents

Description

  The present invention relates to an aerosol double container.

Conventionally, as this type of aerosol double container, there is one described in Japanese Patent No. 293248.
As shown in FIG. 7, the aerosol double container is schematically configured by an outer cylinder 1, an inner cylinder 2, and a mounting cup 3.

The outer cylinder 1 is made of a rigid material such as an aluminum alloy, and a curled portion 4 formed by wrapping the outer cylinder 1 is provided at an opening peripheral edge portion of the mouth portion. The inner cylinder 2 is made of a flexible material such as polyethylene, and a flange portion 5 formed by bending the inner peripheral edge portion of the mouth portion is provided.
The mounting cup 3 includes an injection valve 6 at the center thereof, and a curved peripheral portion 7 that is convex upward is formed on the outer peripheral portion thereof.

In manufacturing the aerosol double container, first, the inner cylinder 2 is inserted into the outer cylinder 1 and arranged so that the flange portion 5 of the inner cylinder 2 is positioned above the curled portion 4 of the outer cylinder 1. At this time, as shown in FIG. 7 , the central portion of the bottom of the inner cylinder 2 is in direct contact with the bottom of the outer cylinder 1. Next, after filling the contents in the inner cylinder 2, the mounting cup 3 is put on the mouth part of the inner cylinder 2, and the flange part 5 of the inner cylinder 2 is fitted into the curved peripheral part 7.

  In this state, after filling the gap between the inner and outer cylinders between the flange part 5 of the inner cylinder 2 and the curled part 4 of the outer cylinder 1 with an injection gas such as pressurized nitrogen gas, the mounting cup 3 is moved downward. It is manufactured by lowering and covering the curved peripheral portion 7 together with the flange portion 5 of the inner cylinder 2 on the curled portion 4 of the outer cylinder 1 and mechanically winding it.

  In the aerosol double container having such a structure, by pressing and opening the injection valve 6, the contents in the inner cylinder 2 are discharged at the pressure of the injection gas, and the injection gas is applied to the contents. There is an advantage that does not mix.

  And in this aerosol double container, since it has been in the state which put the center part of the bottom part of the inner cylinder 2 on the bottom part of the outer cylinder 1, the inner cylinder 2 is filled during the filling operation | work of the contents and the gas for injection. Does not fall into the outer cylinder 1 and the workability is improved.

  However, in this aerosol double container, even if the center part of the bottom of the inner cylinder 2 is in contact with the bottom of the outer cylinder 1, the flexible material forming the inner cylinder 2 does not have a certain degree of rigidity. Due to the weight of the contents and the pressure of the injection gas, the mouth portion of the inner cylinder 2 falls downward, making the subsequent injection gas filling operation and the caulking operation of the mounting cup 3 difficult.

For this reason, a material having a certain degree of rigidity is adopted as the material forming the inner cylinder 2, but in this case, the flexibility of the inner cylinder 2 is insufficient and the gas for discharging the contents is used. There is a problem that the pressure must be increased and the entire contents cannot be used up.
Furthermore, the outer diameter of the bottom part of the inner cylinder 2 is larger than the inner diameter of the mouth part of the outer cylinder 1, and it is difficult to insert the inner cylinder 2 into the outer cylinder 1. is there.
Japanese Patent No. 293248

  The problem in the present invention is that even when an inner cylinder made of a flexible material is used, when the contents are filled, the inner cylinder is not deformed, and the inner cylinder is easily attached to the outer cylinder. It is to be able to be inserted and to solve the above-mentioned disadvantages.

To solve this problem,
The invention according to claim 1 includes an outer can made of a rigid material, an inner bag made of a flexible material housed in the outer can, and the mouth of the outer can and the inner bag, and the inner bag Having a mounting cup with an injection valve for injecting the contents;
The bottom of the outer can is recessed in a bowl shape upwards,
The central portion of the bottom of the inner bag is upwardly has a recess recessed saddle, the outer edge of the recess is a convex two landing that is convex downward And
The aerosol double container is characterized in that only the two landing portions are in contact with a portion other than the central portion of the bottom portion of the outer can.

The invention according to claim 2 is the aerosol double container according to claim 1, wherein the lower portion of the body portion of the inner bag is tapered to form a tapered portion and continues to the bottom portion.
The invention according to claim 3 is the aerosol double container according to claim 1, wherein the outer diameter of the bottom portion of the inner bag is made smaller than the inner diameter of the mouth portion of the outer can.

The invention according to claim 4 is the aerosol double container according to claim 1, wherein the inner bag is gently curved from the shoulder to the neck.
The invention according to claim 5 is the aerosol double container according to claim 1, wherein one or more longitudinal grooves extending in the vertical direction are formed in the body portion of the inner bag.

  The invention according to claim 6 is the aerosol double container according to claim 5, wherein a lower end portion of the longitudinal groove is applied to the taper portion.

  According to the present invention, the mechanical strength of the lower portion and bottom portion of the body portion of the inner bag is partially high, and this portion does not bend and deform when the contents are filled in the inner bag. For this reason, before and after filling the contents into the inner bag, the position of the mouth portion of the inner bag does not move downward, and there is no inconvenience in filling the contents and the injection gas. For this reason, the inner bag can be made of a highly flexible material, requires less pressure to discharge the contents, and does not leave the contents.

  In addition, the lower part of the inner bag body is tapered to reduce the diameter, and the outer diameter of the bottom is made smaller than the inner diameter of the mouth of the outer can 21, so that the inner bag is inserted into the outer can. Becomes easy.

  Furthermore, since the inner bag is in contact with the bottom of the outer can at the edge formed at the bottom, the inner bag is stabilized. In addition, since the bottom portion is recessed in a bowl shape, the bottom portion is easily crushed when the contents are discharged, and the bottom portion is neatly folded, so that the amount remaining without being discharged is reduced.

  Further, since the entire bag is gently curved from the shoulder portion to the neck portion, the injection gas can be filled smoothly and easily without resistance. Furthermore, since the longitudinal groove is formed in the body portion of the inner bag 31, the center portion of the body portion is crushed first when discharging the contents, but even if the body portion is crushed, a gap is formed by the longitudinal groove. A passage through which the content at the bottom discharges can be secured, and the content does not remain at the bottom.

Hereinafter, the present invention will be described in detail.
FIGS. 1 to 6 show an example of the aerosol double container of the present invention. In these drawings, reference numeral 21 denotes an outer can. The outer can 21 has a cylindrical cylindrical shape, and is made of a material that has rigidity such as a metal such as an aluminum alloy and does not transmit the injection gas. Those made of metal are manufactured by impact molding, deep drawing molding, press molding or the like.

The upper portion of the outer can 21 is reduced in a tapered shape to form a shoulder portion 22, the upper portion of the shoulder portion 22 is opened to form a mouth portion 23, and the opening peripheral portion of the mouth portion 23 is The curled portion 24 is formed by being caught.
Further, the bottom portion 25 of the outer can 21 is recessed in a bowl shape upward.

An inner bag 31 is accommodated in the outer can 21. As shown in FIGS. 1 and 3, the inner bag 31 has a bottomed cylindrical shape made of a highly flexible resin such as polyethylene, polypropylene, and nylon (registered trademark). As shown in FIG. 5, the upper portion of the body portion 32 of the inner bag 31 is gradually reduced in diameter to a tapered portion to form a shoulder portion 33, and the upper portion of the shoulder portion 33 is a neck portion 34. The neck portion 34 is curved outward and is expanded and continues to the mouth portion 35, and the opening peripheral portion of the mouth portion 35 is folded back to form a flange portion 36.
Further, the lower portion of the body portion 32 of the inner bag 31 is reduced in a taper shape to become a tapered portion 37 and continues to the bottom portion 38.

Further, as shown in FIGS. 3 and 4, a plurality of vertical grooves 39, 39... Extending in the vertical direction are formed on the outer peripheral surface of the body portion 32 of the inner bag 31. The vertical groove 39 is a V-shaped groove having a shallow bottom and has a depth of about 1 mm. Further, as shown in FIG. 6 , the vertical grooves 39 are evenly arranged on the outer peripheral surface of the body portion 32. In this example, four vertical grooves 39, 39,... Are arranged every 90 degrees. Further, as shown in FIGS. 3 and 4, the vertical groove 39 has a lower end portion extending to the taper portion 37.

Further, as shown in FIG. 6, the central portion of the bottom portion 38 of the inner bag 31 is concaved in a bowl shape upward. The outer edge of the recess is two convex landing portions 40, 40 that protrude downward. The two landing portions 40, 40 are in contact with peripheral portions other than the central portion (top portion) of the bottom portion 25 of the outer can 21.
2 is a cross-sectional view at a cross-sectional position rotated 90 degrees from the cross-sectional position of FIG. 1, and FIG. 4 is a cross-sectional view at a cross-sectional position similarly rotated 90 degrees from the cross-sectional position of FIG.

  Further, the curled portion 24 of the mouth portion 23 of the outer can 21 and the flange portion 36 of the mouth portion 35 of the inner bag 31 are overlapped, and this portion is covered with the curved peripheral portion 42 of the mounting cup 41, and these are integrated. It is mechanically squeezed. An O-ring 44 is attached to the lower surface of the flange portion 36 of the inner bag 31, and the flange portion 36 is brought into contact with the curled portion 24 of the outer can 21 via the O-ring 44 so that it is crimped in an airtight manner. It has become. An injection valve 43 is attached to the center of the mounting cup 41, and the contents in the inner bag 31 are jetted to the outside by pressing this.

  In such an aerosol double container, the inner bag 31 is filled with contents such as cosmetics and hair styling, and a liquefied gas such as liquefied petroleum gas that becomes a jetting gas in the gap between the outer can 21 and the inner bag 31. The inner bag 31 is compressed by the pressure of the jetting gas, and the contents in the inner bag 31 are jetted to the outside from the jet nozzle 43. ing.

Next, an example of a method for producing the aerosol double container will be briefly described.
First, the outer can 21 and the inner bag 31 are prepared in advance, the inner bag 31 is inserted into the outer can 21, and the landing portion 40 of the bottom 38 of the inner bag 31 is directly on the inner surface of the bottom 25 of the outer can 21. Arrange to touch. Next, after the inner bag 31 is filled with the contents, the mounting cup 41 is put on the mouth portion 35 of the inner bag 31.

  Next, after filling the injection gas from between the inner bag 31 and the curled portion 24 of the outer can 21, the mounting cup 41 is pushed down, and the curved peripheral portion 42 of the mounting cup 41 is moved to the flange portion 36 and the outer portion of the inner bag 31. The curl part 24 of the can 21 is put on, and this is wound and crimped to obtain a target aerosol double container.

  In the aerosol double container having such a structure, a plurality of vertical grooves 39 are formed in the body portion 32 of the inner bag 31, a taper portion 37 is formed in the lower portion of the body portion 32, and the center of the bottom portion 38 is formed. A recess recessed in a bowl shape is formed on the upper side, and the bottom of the body 32 of the inner bag 31 is in contact with the bottom 25 of the outer can 21 only at the convex landing portion 40 at the edge of the recess. Further, the mechanical strength of the bottom portion 38 is partially high, and when the contents are filled in the inner bag 31, this portion is not bent and deformed. For this reason, the position of the mouth portion 35 of the inner bag 31 does not move downward before and after the filling of the contents into the inner bag 31, and there is no inconvenience in the filling work of the contents and the injection gas.

  For this reason, the inner bag 31 can be made of a flexible material, requires less pressure to discharge the contents, and does not leave the contents.

  Further, the lower portion of the body portion 32 of the inner bag 31 is a tapered portion 37 and is reduced in diameter, and the outer diameter of the bottom portion 38 is made smaller than the inner diameter of the mouth portion 23 of the outer can 21. Insertion into the can 21 is facilitated. In particular, if the surface layer of the inner bag 31 is formed of a resin such as polyethylene to which a lubricant is added, the slipping is further improved and insertion becomes easier.

  Furthermore, since the inner bag 31 is in contact with the bottom 25 of the outer can 21 at the two landing portions 40 formed on the bottom 38, the inner bag 31 is stabilized. Moreover, since the bottom part 38 is dented in the shape of a bowl, the bottom part 38 is easily crushed when the contents are discharged, and the bottom part 38 is neatly folded, so that the amount remaining without being discharged is reduced.

  Further, since the entire bag is gently curved from the shoulder portion 33 to the neck portion 34, filling of the injection gas is performed smoothly and easily without resistance. Further, since the longitudinal groove 39 is formed in the body portion 32 of the inner bag 31, the central portion of the body portion 32 is crushed first when the contents are discharged, but even if the body portion 32 is crushed, the longitudinal groove 39 is crushed. Thus, a gap is formed, and a passage through which the content in the bottom 38 is discharged can be secured, so that the content does not remain in the bottom 38.

It is a partially exploded sectional view showing an example of the aerosol double container of the present invention. It is a fragmentary sectional view which shows the state which rotated 90 degree | times the aerosol double container shown in FIG. It is the side view which carried out the partial cross section which shows an example of the inner bag used for the aerosol double container of this invention. It is the side view which carried out the partial cross section which shows the state which rotated the inner bag shown in FIG. 3 90 degree | times. It is a perspective view which shows the bottom part of the inner bag used for the aerosol double container of this invention. It is sectional drawing which shows a mouth part from the shoulder part of the inner bag used for the aerosol double container of this invention. It is sectional drawing which shows the conventional aerosol double container.

Explanation of symbols

21 ... outer can, 23 ... mouth, 25 ... bottom, 31 ... inner bag, 37 ... taper, 38 ... bottom, 39 ... longitudinal groove, 40 ...・ Landing part, 41 ... Mounting cup

Claims (6)

An outer can made of a rigid material, an inner bag made of a flexible material housed in the outer can, and an injection valve for closing the mouth of the outer can and the inner bag and discharging the contents in the inner bag A mounting cup with
The bottom of the outer can is recessed in a bowl shape upwards,
The central portion of the bottom of the inner bag is upwardly has a recess recessed saddle, the outer edge of the recess is a convex two landing that is convex downward And
An aerosol double container, wherein only these two landing portions are in contact with a portion other than the central portion of the bottom portion of the outer can. The aerosol double container according to claim 1, wherein the lower portion of the body portion of the inner bag is tapered to form a tapered portion and continues to the bottom portion. 2. The aerosol double container according to claim 1, wherein the outer diameter of the bottom portion of the inner bag is made smaller than the inner diameter of the mouth portion of the outer can. The aerosol double container according to claim 1, wherein the inner bag is gently curved from the shoulder to the neck. The aerosol double container according to claim 1, wherein one or more longitudinal grooves extending in the vertical direction are formed in the body portion of the inner bag. 6. The aerosol double container according to claim 5, wherein a lower end portion of the longitudinal groove is applied to the taper portion.

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