Dispensing – With discharge assistant – Fluid pressure
Patent
1994-05-06
1995-11-21
Huson, Gregory L.
Dispensing
With discharge assistant
Fluid pressure
2224641, B65D 8300
Patent
active
054679028
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to an aerosol device for dispensing a composition with a relatively high viscosity, in particular a gel or an emulsion, of the type of those which comprise a can, intended to be used with the head upwards, containing the composition and a pressurized gaseous propellant agent acting directly on the composition, a dispensing valve being placed on an opening at the upper part of the can, while a dip-tube connected to the valve extends as far as the vicinity of the bottom of the can.
THE KNOWN PRIOR ART
U.S. Pat. No. 3,541,581 shows, in particular in FIG. 5, an aerosol device of this kind, in which no physical separation is provided between the pressurized gaseous propellant agent and the composition to be dispensed.
Such an aerosol device is not entirely satisfactory when the viscosity of the composition to be dispensed is relatively high. FR-A-2,223,452 emphasizes the difficulties and the problems of operation encountered in such a situation. The viscous composition does not flow evenly in the dip-tube and cavitation phenomena with loss of propellant gas through the dispensing valve occur. This results in a substantial decrease in the emptying ratio (ratio of the maximum quantity of composition dispensed by the device to the total mass of this composition introduced into the can).
In order to overcome such drawbacks, FR-A-2,223,452 proposes stable gel compositions with retarded foaming having a relatively low flow threshold, which corresponds to a viscosity which is also relatively low.
This solution, which rules out more viscous compositions, but nevertheless being of great interest, in particular as regards self-foaming shaving gels, aims to promote the flow of the composition in the dip-tube and in the valve in order to reduce the cavitation phenomena.
Such an approach is understandable because it is known that, in order to promote the flow of a product in a set of tubes and pipelines, it is generally suitable either to decrease the viscosity of the product while keeping the passage cross-sections constant, or to increase the passage cross-sections if the viscosity of the product cannot be altered.
OBJECT OF THE INVENTION
The object of the invention is above all to provide an aerosol device of the type previously defined which makes it possible to improve the flow of the composition while avoiding or at the very least while reducing the cavitation phenomena and while improving the emptying ratio without having to reduce the viscosity of the composition to be dispensed.
SUMMARY OF THE INVENTION
According to the invention, an aerosol device of the type defined previously is characterized in that the composition to be dispensed has a viscosity (measured on a Brookfield DV III viscometer, needle no. 7) lying in the range of 4000 to 10,000 millipascal.second, preferably of 6000 to 8000 millipascal.second, for a speed of 100 revolutions/minute and of 30,000 to 150,000 millipascal.second, preferably of 50,000 to 120,000 pascal.second, for a speed of 2.5 revolutions/minute, and in that the dip-tube consists of a semi-capillary tube whose internal diameter lies between 0.7 and 1.5 mm and preferably between 1.3 and 1.5 mm.
The invention, surprisingly and unexpectedly, makes it possible to improve the flow conditions of a viscous product, from the point of view of the evenness of this flow and of the decrease or even the elimination of cavitation phenomena, by providing a reduced passage cross-section, in contrast to what might be thought.
Tests carried out with an aerosol device according to this embodiment have made it possible to obtain, in certain cases, an emptying ratio of more than 80% during continuous dispensing, and the emptying ratio is improved in all cases, in comparison with a device equipped with a valve of the same type but with a normal dip-tube whose diameter is greater than the values indicated hereinabove, by at least 10% absolute.
The valve is fitted with a tail which includes a cylindrical housing in which the upper end of the semicapillary
REFERENCES:
patent: 2837375 (1958-06-01), Efford et al.
patent: 3541581 (1970-11-01), Monson
patent: 4019657 (1977-04-01), Spitzer et al.
patent: 4853430 (1989-08-01), Stuhler et al.
patent: 5032619 (1991-07-01), Frutin et al.
"L'Oreal"
Huson Gregory L.
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