JPH034373Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel dual aerosol container.
More specifically, the present invention relates to a double aerosol container that has a small number of parts and can be easily assembled.

Conventionally, double aerosol containers have been used in which the contents to be ejected and the compressed gas for pressurizing the contents are separately housed in the container.

Such double aerosol containers are usually made of a pressure-resistant outer cylinder made of a metal such as aluminum or iron, and an inner cylinder made of a thin aluminum plate so that it can be easily crushed by the pressure of compressed gas. The contents are housed in the cylinder, and the compressed gas is housed in the space between the inner cylinder and the outer cylinder.

Recently, attempts have been made to use various types of soft synthetic resin inner cylinders as such inner cylinders, but for example, the inner cylinders formed by blow molding as shown in FIG. There are some drawbacks. That is, the flange 51 formed at the mouth of the inner cylinder 2 and brought into close contact with the curl of the outer cylinder is usually cut after blow molding the inner cylinder 2, but the work of cutting the flange 51 that expands radially outward into a circular shape is necessary. is extremely difficult. Furthermore, the outer diameter of the flange 51 varies or is eccentric, and the seal between the inner cylinder 2 and the curl 4 or between the inner cylinder and the mount member is insufficient. Furthermore, since there is variation in the wall thickness of the flange (for example, in the case of a flange with a wall thickness of 0.4 mm, there is a variation of about ±0.1 mm in blow molding), the packing effect is insufficient. Therefore, when conventionally using a soft synthetic resin blow molded product as the inner cylinder, it is necessary to insert a seal between the flange of the inner cylinder and the mount member and between the flange and the curl of the outer cylinder, which reduces the number of parts. However, there are disadvantages in that the manufacturing process is complicated and the manufacturing cost is high.

Therefore, the inventor of the present invention made extensive studies to eliminate the above-mentioned drawbacks, and found that an outer cylinder, an inner cylinder that is a blow-molded product made of soft synthetic resin that is inserted into the outer cylinder,
a mount member that is attached to a mouth formed by overlapping the inner cylinder and the outer cylinder, a curl is formed at the mouth of the outer cylinder, and the outer diameter of the curl is once formed at the mouth of the inner cylinder. When using a double aerosol container, which is characterized by a packing flange that is expanded outward to a smaller outer diameter and then folded back inward, cutting the packing flange is easy. In addition, we discovered the new fact that the outer diameter of the packing flange is highly accurate, and the double packing flange functions as a packing as it is, so there is no need to use a seal ring. I've come to the point where I can complete it.

Next, the double aerosol container of the present invention will be explained with reference to the drawings.

Fig. 1 is a partially cutaway front view showing an embodiment of the double aerosol container of the present invention, Fig. 2 is an enlarged vertical sectional view showing the main parts of Fig. 1, and Figs. A partially cutaway front view showing an embodiment of the inner cylinder in the invention, and FIGS. 5 and 6 are bottom views of the inner cylinder shown in FIGS. 3 and 4, respectively.

As shown in Fig. 1, an inner cylinder 2 is inserted into the outer cylinder 1, and a valve mount is installed as a mount member at the portion where the openings of the outer cylinder 1 and the inner cylinder 2 overlap. Cap 3 is crowned. The outer cylinder 1 is made of a pressure-resistant material such as aluminum or iron.
The inner cylinder 2 is made of blow moldable soft thermoplastic resin such as polyethylene, nylon, ethylene-vinyl alcohol copolymer, polyethylene terephthalate, etc., depending on the type of contents, either singly or in combination in a laminated form. You can use the

Although the valve mount cap 9 is shown as the mounting member in the above embodiment, other mounting members may be used, such as the shoulder of a double aerosol container in which the body and shoulder are manufactured separately.

As shown in detail in FIG. 2, a curl 4 is formed at the mouth of the outer cylinder 1. A packing flange 5 is formed at the mouth of the inner cylinder 2, which is expanded outward to have an outer diameter smaller than the outer diameter of the curl 4, and then folded back inward. An annular recess 6 is formed in the valve mount cap 3 so as to enclose the curl 4 and the packing flange 5. After the outer cylinder 1, inner cylinder 2, and valve mount cap 3 are stacked on top of each other as shown in FIG. 2, the inner wall bottom 3a of the valve mount cap 3 is extended outward, so that
It is caulked. Therefore, the inner cylinder 2 is fixed by being inserted between the outer cylinder 1 and the valve mount cap 3.

In the double aerosol container configured as described above, the outer cylinder 1, the inner cylinder 2, and the valve mount cap 3 are securely fixed at the inner wall bottom 3a, but are sealed against each other at that position. Rather, the elasticity of the packing flange 5 confined within the annular recess 6 ensures a secure seal. That is, since the outer surface of the packing flange 5 is in contact with the mold during blow molding, it is finished in an accurate shape and size. Therefore, there is almost no eccentricity or variation. Further, since the packing flange 5 is formed in double layers, variations in wall thickness are alleviated, and the sealing effect based on elastic force is high. Therefore, there is no need to use any special packing, which simplifies the manufacturing process and reduces manufacturing costs.

However, if a particularly strict sealing performance is required due to the pressure of the compressed gas, etc., it is of course possible to use a thin rubber packing together with the packing flange if desired.

Furthermore, since the packing flange 5 of the inner cylinder 2 in the present invention is once expanded outward and then folded back inward, cutting after blow molding is easy. In particular, when the inner edge of the folded portion of the packing flange 5 is made to protrude in the axial direction as shown in FIG. 1, the protruding portion 52 may be cut in a direction perpendicular to the axis. This makes cutting work easier.

In addition, the shape of the inner cylinder 2 in the present invention may be, for example, as shown in FIGS. 3 and 5, where the bottom part 21 is formed flat so as to be easily crushed starting from the bottom part 21, or as shown in FIGS. 4 and 6. As shown in FIG. 2, there are various types of pipes, including one having a groove 22 extending in the longitudinal direction, in order to ensure a ventilation path for compressed gas from the bottom part 21 to the mouth part 24 side even if the center part 23 of the inner cylinder 2 collapses first. shape can be adopted.

As mentioned above, the double aerosol container of the present invention has a simple manufacturing process and low manufacturing cost, so its practical value is extremely high.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view showing an embodiment of the double aerosol container of the present invention, Fig. 2 is an enlarged vertical sectional view showing the main parts of Fig. 1, and Figs. 5 and 6 are bottom views of the inner cylinder shown in FIGS. 3 and 4, respectively. FIG. 7 is a conventional double aerosol container. FIG. Main symbols in the drawing: 1...outer cylinder, 2...inner cylinder, 3
... Valve mount cap, 4 ... Curl, 5
...Patzkin flange.

Claims (1)

[Scope of utility model registration request] An outer cylinder, an inner cylinder that is a blow molded product made of soft synthetic resin that is inserted into the outer cylinder, and a mount member that is attached to the mouth formed by overlapping the inner cylinder and the outer cylinder. A curl is formed at the mouth of the outer cylinder, and a packing flange is formed at the mouth of the inner cylinder by expanding outward to an outer diameter smaller than the outer diameter of the curl and then folding back inward. A double aerosol container characterized by: