Dispensing – Collapsible wall-type container – With wall-collapsing means
Patent
1998-04-13
2000-02-01
Quinalty, Keats
Dispensing
Collapsible wall-type container
With wall-collapsing means
222105, 2223865, B65D 3528
Patent
active
060192526
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
Field of the Invention
This invention relates to aerosol cans containing compositions which are not compatible with ordinary aerosol cans formed from normal steel plate. Typically such compositions require that very expensive structures be used to avoid any contact between the composition and the can. Typical compositions are those that are highly acidic. Although the cans can be coated, it is difficult to assure that the coating is completely without holes. Solutions to the problem have included using liners that are used to contain only the composition, with the propellant being outside the liner. However, detergent compositions, especially acidic compositions that are useful in cleaning bathroom soils. benefit from having the propellant in the composition. The aerosol propellant expands to provide improved distribution and/or foam for improved visibility of the treated portions of the surface. Such consumer products also require that the individual articles be made quickly and inexpensively.
SUMMARY OF THE INVENTION
The invention relates to the use of a plastic container (liner) that fits closely inside a conventional aerosol can to provide protection for the can. The completed liner/container and can assembly is filled with, e.g., an acidic detergent composition and aerosol propellant. In order to manufacture the assembled container/can. inwardly curved channels are provided linearly down the sides of the plastic container to allow air to escape when the plastic liner/container is inserted into the body of the aerosol can before the top is added to the can. The plastic container is molded into a collar around the valve opening in the top of the can after the top is attached to the body. This "pre-assembly" container is then filled with the active composition to the desired amount. An acid compatible valve assembly is attached through the valve opening to seal the can, and propellant is added in a typical through-the-valve operation.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is an elevational view of the complete assembly, partially sectional, with the valve being not in section since it is any conventional valve that is resistant to acid attack. The plastic container is shown before pressurization, to display the air flow channels as they appear before the aerosol propellant is added.
FIG. 2 is a close up sectional view of the seals between the base and top of the can and the valve assembly and top of the pre-assembly.
FIG. 3 is an exploded view of the "pre-assembly" with the liner/container before assembly.
FIG. 4 is a cross section of the liner/container along the section line AA.
FIG. 5 is a view of a typical valve assembly.
FIG. 6 is an exploded view of the top of the pre-assembly after the liner/container is trimmed.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
The aerosol can is a conventional can, preferably metal, either aluminum or tin plate steel, more preferably tin plate. The base of the can comprises a cylinder wall 10, a bottom 11, and a top 12 that are either integral with the cylinder 10 (bottom only), or attached thereto by crimping, welding, gluing, and/or clamping. The essence of the invention is to provide a plastic liner/container 13 that is independently able to contain the composition, e.g., acidic detergent composition, that will ordinarily attack the can.
The liner/container 13 is relatively heavy, having a thickness of from about 0.006 in. to about 0.035 in., preferably from about 0.015 in. to about 0.020 in. The liner/container is made of plastic, preferably polyolefin, more preferably polyethylene (preferably high density) or polypropylene, more preferably oriented high density polyethylene. The liner, or container, is relatively stiff, providing resistance to bending collapse, etc., when subjected to the force required to insert the liner into the can body. The air channels 14 in the liner/container provide both improved structural resistance to premature collapse of the liner/container and an egress for the air that would otherwise be trapp
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patent: 3097766 (1963-07-01), Biehl et al.
patent: 3731854 (1973-05-01), Casey
patent: 4387833 (1983-06-01), Venus, Jr.
patent: 4964540 (1990-10-01), Katz
patent: 5111971 (1992-05-01), Winer
patent: 5232126 (1993-08-01), Winer
patent: 5265765 (1993-11-01), Maier
Benecke Arnold George
Carrier Frank Leslie
Woo Ricky Ah-Man
Camp Jason J.
Quinalty Keats
The Procter & Gamble & Company
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