Dispensing – Collapsible wall-type container – With casing or support
Reexamination Certificate
2000-04-03
2002-06-11
Bomberg, Kenneth (Department: 3754)
Dispensing
Collapsible wall-type container
With casing or support
C222S095000, C222S402000, C222S001000
Reexamination Certificate
active
06401979
ABSTRACT:
FIELD OF THE ART
The invention relates to a double pressurized container for under-cup charging and a double pressurized product using the same. More specifically, the present invention relates to improvements for facilitating under-cup charging in a double pressurized product which is equipped with a container main body with an opening at its upper end, an attached mounting cup for closing the opening, and an inner bag which has flexibility and which is interposed between the container main body and the mounting cup.
BACKGROUND ART
There has been known such a double pressurized product as a dispenser or aerosol product, which houses a flexible inner bag in its container main body and also which charges the inner bag with a content, i.e. concentrate to be discharged and also charges such a propellant as a pressurized gas between the inner bag and the container main body. The content housed in such a double pressurized product can be directly charged into the inner bag via an ejecting valve or through an opening in the inner bag. The propellant, on the other hand, is charged by either of two methods of charging it through a charging valve independently disposed at a bottom of the container main body or charged through a gap between a flange portion of a mounting cup and a bead portion of the container main body directly before the ejecting valve is crimped to the opening in the container main body using the mounting cup, which is so-called an under-cup charging method.
A double pressurized product equipped with a charging valve needs additional machining of its container main body and mounting of an independent charging valve, thus increasing its manufacturing cost. Therefore, an under-cup charging method has been proposed so far. This under-cup charging method, however, needs to charge a propellant through a gap between its inner bag and a container main body to be sealed in an air-tight manner finally. With this, in particular, in such a type of a double pressurized container that a flange portion of the inner bag is hung at bead portion disposed in an opening in the container main body, the inner bag needs various devices such as having vertical ribs for securing a passage for the passage (see, for example, Japanese Patent Application Laid-Open Nos. Sho-56-84270 and Sho-57-104571).
Also, since a propellant is charged with a high pressure of 0.3-5.0 Mpa, it may enter the inner bag at a gap between the inner bag (its flange portion) and the mounting cup (its curved flange portion) through between the neck portion of the inner bag and the rising wall of the mounting cup. Also, as mentioned above, the propellant (particularly in the case of a nitrogen gas, which has a lower solubility into the concentrate) is charged with a high pressure, part of the propellant which penetrated into the inner bag through the gap may cause a burst of the inner bag, which is a problem. The above-mentioned Japanese Patent Application Laid-Open Nos. Sho-56-84270 and Sho-57-104571 suggest that an adhesive agent or a sealant should be interposed between the inner bag and the mounting cup in order to prevent such penetration.
Japanese Patent Application Laid-Open No. Hei-9-2551, on the other hand, suggests such a method for manufacturing a double pressurized product that a propellant should be charged between the container main body and the inner bag beforehand and then part of the propellant leaked into the inner bag should be discharged by, for example, vacuum suction and then a content should be charged into the inner bag. With this method, no propellant may enter the inner bag. With this method, moreover, the inner bag, when empty, is engaged with and held at a bead portion of the main body, so that the engagement need not to be heavy, thus making it possible to disengage it easily. Also, Japanese Utility model Publication No. Hei-3-4373, though not relating to under-cup charging, discloses a method of folding back the flange portion of the inner bag 2-ply, to omit a gasket.
The above-mentioned method of interposing an adhesive agent or a sealant between the inner bag and the mounting cup is difficult to put into practice in the present-day assembly-line mass-production step portions whereby the inner bag and the mounting cup are manufactured independently of each other and then mounted at a charging step portion. In addition, the method by the above-mentioned Japanese Patent Application Laid-Open No. Hei-9-2551 of under-cup-charging a propellant beforehand and removing part of the propellant entered into the inner bag and then charging the inner bag with a content needs to charge the content against an inner pressure, thus being undesirable because of its double-step portion operations.
The present invention attempts technologically to minimize as much as possible the penetration of a propellant. into an inner bag without changing the conventional under-cup charging method as much as possible.
It has been found that such penetration of a propellant through a gap can be reduced to some extent by enhancing the strength of sealing between the inner bag and the mounting cup. The inner bag, however, has a flexibility and the flange portion of the inner bag cannot be prevented from being lifted, so that it is impossible to prevent penetration sufficiently. With this, the Inventor has analyzed and discussed about a mechanism of penetration into the inner bag at the time of under-cup charging with a conventional double pressurized product. As a result, the Inventor has found that in the case of a double pressurized container using a container main body having a bead portion, a gasket placed inside the curved flange portion of the mounting cup has a significant function on the penetration of a propellant into the inner bag.
That is, in such a double pressurized product, as shown in
FIG. 19
a
, in a curved flange portion
102
of a mounting cup
101
is housed a rubber-made ring-shaped gasket
104
for sealing a gap between the curved flange portion and a bead portion
103
of a container main body. Then, as shown in
FIG. 19
b
, after assembly, the gasket
104
is abutted against the bead portion
103
directly in order to provide a secure sealing function, so that an outer diameter of a flange portion
106
of an inner bag
105
is made a little smaller than that of the gasket
104
.
Therefore, when, during assembly, a valve assembly is once mounted on the upper part of the container main body and then lifted up for under-cup charging, as shown in
FIG. 20
, the gasket
104
is in close contact with the curved flange portion therein and, on the other hand, an outer periphery of the flange portion
106
of the inner bag is separate from the surface of the gasket
104
or only a slightly abutted against it. Therefore, it is considered that at the time of under-cup-charging, the outer periphery of the flange portion
106
is lifted up, thus permitting a propellant to enter the inner bag through a gap
107
.
With this, the Inventor has devised the present invention, considering that the above-mentioned problem of penetration of a propellant at the time of under-cup charging can be prevented significantly by enhancing a degree of contact between the inner bag and the mounting cup and also by employing a sealing structure between the mounting-cup and the container main body basically providing no gasket or, even if a gasket is provided, by employing such a sealing structure as not to give rise to the above-mentioned problem.
Disclosure of Invention
From the viewpoint of the above, a double pressurized container for under-cup charging according to the present invention comprises a container main body equipped with an opening at its upper end, a mounting cup attached for closing the opening, and an inner bag which has flexibility and also which is interposed between the container main body and the mounting cup, wherein the above-mentioned inner bag is equipped with a neck portion which is in close contact with an outer periphery of a rising wall of the mounting cup and also which abuts against that periphery wi
Mekata Satoshi
Tanaka Masazumi
Bomberg Kenneth
Browdy and Neimark
Nicolas Frederick C
Osaka Shipbuilding Co., Ltd.
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