Fluent material handling – with receiver or receiver coacting mea – Processes – Filling dispensers
Reexamination Certificate
1998-12-21
2001-03-06
Douglas, Steven O. (Department: 3751)
Fluent material handling, with receiver or receiver coacting mea
Processes
Filling dispensers
C141S018000, C141S020000
Reexamination Certificate
active
06196275
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a manufacturing method of a double chamber aerosol container used where contents, such as hair care products, cosmetics, antiperspirant-deodorants, other human body treatment products, insecticides, coating materials, cleaners, and other products for household, industrial materials, automobile goods, medicines, foods, and so on, are filled in an inner sack and where a propellant is filled in an outer container below a mountain cup or container cap.
2. Description of Related Art
Containers in which an inner sack filled with contents is mounted within an outer container and its volume is reducible according to reduction of the contents, have been known previously. In a double-chamber aerosol container, any direct contact between the propellant and the aerosol contents is not favorable.
In such a conventional double chamber aerosol container, the inner sack is attached inside the aerosol container where an edge of an orifice of the inner sack is engaged with a bead portion of the aerosol container and where the lower end of the inner sack is in contact with the bottom of the aerosol container. Contents only, without any propellant, are filled within the inner sack thus mounted.
After those contents are filled, the container cap is fitted inside the inner sack. After an upper opening of the inner sack is disposed at a space between the container cap and the bead portion of the aerosol container, the inner sack and the container cap are lifted upward to form a filling gap for the propellant between the outer periphery of the opening of the inner sack and the bead portion of the aerosol container, and thereby the propellant is filled within the aerosol container via the filling gap.
With this conventional method, however, the exterior is in air communication with the inside of the inner sack, because the contents are placed in the inner sack where the inner sack before the container cap is fitted is mounted within the container. If the contents are filled in such a circumstance, the contents may be spilt out when the container cap is fitted where the contents are filled up closely to the opening of the inner sack. On the other hand, if the contents are filled in a smaller amount, air may remain in the inner sack, and as a result, the contents may be oxidized or deteriorated.
Where the contents are agent type using an isopentane in a gel form or the like, the contents may be deteriorated due to contacts with the open air, or the isopentane may evaporate and generate bubbles where the temperature of the isopentane increases due to contacts with the open air, and those raise problems during such filling work. In case the open air contacts with the contents, such contacts are not favorable for medicines, cosmetics, foods, and so on for which prevention of contamination is strongly demanded.
The inner sack is in a state that the bottom of the inner sack is in contact with the inner surface of the bottom wall of the aerosol container to endure the weight of the contents when the contents are filled where the inner sack is mounted within the aerosol container. The bottom end of the inner sack thus contacts with the bottom of the aerosol container, so that the inner sack is advantageously stably disposed within the aerosol container in opposing to the weight of the contents.
In case the inner sack extends longer than the standard size due to manufacturing deviations of the inner sack or extensions of the material, however, the bead portion of the aerosol container is not properly in contact with the outer peripheral surface of the inner sack, thereby frequently rendering the inner sack inclined or projected upward. In such a case, sealing may become inadequate during clinching between the container cap and the bead portion at the final process. In case the inner sack is formed shorter than the standard size, the inner sack may accidentally drop in the aerosol container, and disadvantageous problems for the manufacturing process may happen frequently.
SUMMARY OF THE INVENTION
It is an object of the invention, from a viewpoint to solve the problems above, to provide a manufacturing method of an aerosol container capable of preventing contents from contacting with open air during filling of the contents to keep the contents away from deterioration or the like due to oxidation of the contents.
It is another object of the invention to provide a manufacturing method of an aerosol container not subject to overfilling or shortage of filling of the contents and, even if subject to shortage of filling, not subject to oxidation due to contacts between the open air and the contents.
It is yet another object of the invention to provide a manufacturing method of an aerosol container in which a bead portion of the aerosol container and an outer peripheral edge of an opening of a container cap and an inner sack are surely engaged with each other and in which such an engagement secures the container cap by clinching it so as not to create leaks and prevents the contents from deteriorated due to oxidation.
The foregoing objects are accomplished with an aerosol container including: an outer container having a hollow interior and a bead portion formed on a surface of the outer container; an inner sack, whose volume is reducible according to reduction of contents, inserted in the hollow interior of the outer container to be mounted, the inner sack having an opening for containing the contents; and a container cap, to which a valve assembly is disposed, fitted in an inner periphery of the opening of the inner sack and engaged with the bead portion of the outer container for constituting, together with the inner sack, a liquid container, wherein a lower end of the inner sack is not in contact with a bottom of the hollow interior of the outer container.
In another aspect of the invention, a method for manufacturing a double chamber aerosol container has the steps of: inserting a container cap, to which a valve assembly is disposed, in an inner periphery of an opening of an inner sack, whose volume is reducible according to reduction of contents, to fit the container cap at the opening, the inner sack and the container cap constituting a liquid container; inserting the inner sack in an outer container upon temporarily fitting the container cap to a bead portion of the outer container without immovably securing the container cap to the bead portion; coupling the outer container with a filling head for a propellant where a lower end of the inner sack is not in contact with a bottom of a hollow interior of the outer container; lifting the container cap upward from the bead portion to form a filling gap between the container cap and the bead portion; introducing the propellant into the outer container via the filling gap; securing the container cap and the outer container to each other by way of the opening of the inner sack upon immobilizing the container cap by clinching the container cap to the bead portion; and filling the contents within the inner sack by way of the valve assembly.
According to a preferred embodiment, the container cap is fitted immovably in the opening of the inner sack. The container cap is preferably fitted by, while the inner sack is suspended, frictional force not making the inner sack drop due to the weight of the inner sack. A communication gap for a propellant in a size of 0.01 to 1.00 mm may be formed between an inner peripheral surface of the bead portion and an outer peripheral surface of the inner sack.
To manufacture the double chamber aerosol container thus constituted, first, the container cap is inserted as to fit to the inner sack in which the contents are filled before the contents are filed in the sack. The container cap is fitted to the inner periphery of the opening of the outer container. This fitted state can be an immobilized state such as adherence or welding between the container cap and the inner sack or be made by coupling with fitting force of a degree that the inner sack does not drop fro
Hachinohe Yukio
Maeda Kazuhide
Mitsui Toshiyuki
Yazawa Iwao
Douglas Steven O.
Huynh Khoa
Kanesaka & Takeuchi
Toyo Aerosol Industry Co. Ltd.
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