Dispensing – With discharge assistant – Container with follower
Reexamination Certificate
1998-08-03
2002-02-12
Jacyna, J. Casimer (Department: 3751)
Dispensing
With discharge assistant
Container with follower
C222S386500, C222S387000, C141S003000, C141S020000, C053S266100, C053S470000
Reexamination Certificate
active
06345739
ABSTRACT:
FIELD OF ART
The present invention relates to a process for producing a double dispensing device like an aerosol device and a container therefor, and more particularly, to a process for producing a double dispensing device characterized in steps of loading stock solution or concentrate and pressurized gas, and to a double dispensing container adapted to the process.
BACKGROUND ART
Generally, as known dispensing devices, there are two types of devices, that is, a general type in which stock solution is loaded into a container together with propellant, and a so called “double dispensing device” in which stock solution is loaded into a container, and the stock solution is separated from the propellant by means of a barrier wall such as a piston or an inner bag such that the stock solution is pressurized by the propellant through the barrier wall. The latter is used for loading liquid food or the like which is not preferable to be blended with propellant, or stock solution which might react with propellant when they are blended with each other. As the barrier, a collapsible inner bag or a piston that is movable up and down in the container is used generally. In some devices in which a piston is used as a barrier wall, the upper chamber is loaded with stock solution, and the lower chamber is loaded with propellant (liquefied gas or compressed gas). In another case, the upper chamber is loaded with a pressurized gas and the lower chamber is loaded with a stock solution. The latter case is reasonable, since the pressurized gas is low in specific gravity. However, such type of device needs a tube extending bellow from a dispensing valve (aerosol valve) through the piston. In this case, the piston moves by sliding along the tube and an inner wall of the container.
Further, when a stock solution and propellant are loaded into a container, stock solution which can be loaded under atmospheric pressure is loaded fore in a general case, and pressurized gas is thereafter loaded through a gas-loading-valve or by so-called under-cup-loading. The gas-loading-valve might be provided in a bottom of the container or a mounting cup of the dispensing valve. However, the gas-loading-valve attached separately provides excess cost, and the loading process is troublesome. For example, the above-mentioned passing through the piston is produced by the following steps. That is to say, a pipe-like nozzle is inserted through a tube-inserting hole of a piston, and a stock solution is loaded below the piston thereby lifting the piston by means of pressure or buoyancy. Then, under an unstable state that the piston lifts on the way, a tube fixed to the dispensing valve is inserted through the tube-inserting hole of the piston. Then, a pressurized gas is loaded with under-cup-loading through a gap between the dispensing valve and an opening of the container, and immediately after the gas-loading, the dispensing valve is crimped, or the pressurized gas is loaded through a gas-loading-valve separately provided on the container. Therefore, some gap is required between the tube-inserting hole and the tube, and the propellant might leak through the gap.
Therefore, in such type of dispensing device that propellant is loaded in the lower side of the piston, a gas-loading-valve is necessary to be provided in the bottom of the container. Therefore, high cost is required, the loading work is troublesome, and production efficiency is low. In addition, there is probability of leak through the propellant-loading-valve.
In a case of double dispensing device using an inner bag, the loading process is troublesome when under-cup-loading is employed. Specifically, when a loading valve is attached at a bottom of container, cost is high, and there is probability of leak of propellant.
Further, when compressed gas is employed as propellant, the gas-leak problem among the above-mentioned problems becomes important especially, since the loaded amount of the pressurized gas depends on the volume and the upper bound of pressure, and the propellant cannot be loaded in excess. That is to say, when compressed gas is used, the device is very sensitive to leak of gas not similar to the case of liquefied gas.
The object of the present invention is to provide a process for producing a double dispensing device which is easily loaded and propellant does not easily leak. Another object of the present invention is to provide a double dispensing container to be used go for the process.
DISCLOSURE OF INVENTION
According to the present invention, there is provided a process for producing a double dispensing device, by providing a pressure-transmittable barrier wall to separate an inside of a vessel (or body of container) into a first chamber and a second chamber, a dispensing valve, a passage to connect the dispensing valve with the first chamber, and a check valve means capable of flowing liquid from the first chamber to the second chamber in a pressure vessel; loading pressurized gas substantially insoluble to stock solution into the first chamber from the valve through the passage, and further bringing the pressurized gas to the second chamber through the check valve means; and loading stock solution into the first chamber through the passage from the valve.
At the step of loading a stock solution from the valve, the gas remaining in the first chamber might be forcibly brought to the second chamber by means of a stock solution loaded into the first chamber. The gas remaining in the first chamber might also be discharged through the valve after the step of loading the gas and before the first chamber is loaded with the stock solution. In the step of loading stock solution in the first chamber, it is preferable to load the stock solution so sufficiently that some stock solution overflow the first chamber to the second chamber.
The double dispensing container of the present invention comprises a pressure vessel; a dispensing valve mounted on a top opening of the vessel; a pressure-transmittable barrier wall for separating an inside of the vessel with airtight manner into a first chamber to be loaded with stock solution and a second chamber to be loaded with pressurized gas; a passage for connecting the valve with the first chamber; and a check valve means for enabling movement of gas from first chamber to the second chamber when pressure in the first chamber is higher than that of the second chamber and for preventing movement of gas from the second chamber to the first chamber when pressure in the second chamber is higher than that of the first chamber. However, it is not necessary to seal perfectly the movement in the reverse direction.
The above-mentioned barrier wall might be a piston which separates the inside of the vessel and is slidable in an up-down direction. The piston might be constructed so as to function as the check valve means for enabling gas movement from the first chamber to the second chamber and for preventing reverse movement. In this case, when the lower side is the first chamber, the above-mentioned passage might be a tube for connecting the valve with the first chamber. When the upper side is the first chamber, the valve might be directly connected with the first chamber.
When the piston functions as a check valve means, it is preferable that the periphery of the piston is yieldable elastically toward inside so that the piston can function as a check valve. Further, a stopper is preferably interposed between the vessel or valve and the piston so as to secure some space for the second chamber with a predetermined volume when the piston moves to decrease the volume of the second chamber. The above-mentioned predetermined volume is preferably 30 to 50% of the volume of the vessel. The stopper can be obtained by an inner face of the vessel or a lower face of the valve to be abutted against the piston.
The above-mentioned barrier wall can be made of a collapsible or deformable inner bag of which inside becomes the first chamber. In this case, the inner bag is preferably provided with a check valve at the bottom of the inner bag or
Daizo Co., Ltd.
Jacyna J. Casimer
LandOfFree
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