Dual-chamber package

Details Dual-chamber package Dual-chamber package

1991-10-14

1993-05-18

Kashnikow, Andres

Dispensing

With discharge assistant

Container with follower

22240216, B65D 2518

Patent

active

052113167

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE PRESENT INVENTION

The invention is directed to a dual-chamber package comprising a substantially dimensionally stable outer container (1) for receiving liquid or pasty contents and provided with a dispensing valve (2), and an inner container disposed within the outer container (1) for receiving a pressurized gas such as pressurized air, nitrogen or the like, wherein the inner container (3) is designed as a flexible bag and wherein the dispensing valve (2) comprises a dispensing tube (17) disposed within a valve body (14) for movement from a closed position to an open position, and vice versa.
Such dual-chamber packages are generally known, for example from EP-A-0181116, EP-A-0033377 or GB-B-1425854.
The known dual-chamber packages exhibit the common feature that the inner bag includes chemical agents for producing pressurized gas which are activated when a predetermined period of time has elapsed. To this end, for instance in accordance with the proposal of EP-A-0033377, the inner bag includes means for delaying the chemical reaction for producing pressurized gas.
It appears obvious that the mentioned proposals require a considerable design effort. Furthermore, the operational safety is not all that could be desired. Finally, the expenses are additionally increased by the use of chemical agents for producing an adequate quantity of pressurized gas within the inner bag. Due to this fact the ecological compatibility of these known designs is extremely doubtful. Therefore the dual-chamber packages of the specified kind have not been widely accepted for practical use.


SUMMARY OF THE INVENTION

The present invention is based on the object of providing a dual-chamber package of the kind specified in the introductory part which has a simple design, operates safely over prolonged periods of time and is highly compatible in ecological respect.
The above-specified object is solved in accordance with the invention by the characterizing features wherein a dual-chamber package of the invention features a multi-functional dispensing valve. The valve is used, on the one hand, for filling an inner bag with pressurized gas, preferably pressurized air or nitrogen. On the other hand, this dispensing valve may be used to dispense therethrough the contents from the outer container. Due to this dual function of the dispensing valve the design effort is considerably facilitated as compared with the prior art. Furthermore, no separate chemical agents are required for producing pressurized gas. The ecological compatibility of the dual-chamber package according to the invention is extremely good due to the use of pressurized air or nitrogen as the pressurized medium. Since there are no chemical substances for producing pressurized gas and no means for delaying the start of the reaction, the operational safety of the dual-chamber package according to the invention is also far superior to the prior art. Thus, the dual-chamber package according to the invention represents a self-contained, particularly simple and operationally safe design which is considerably less harmful to the environment than the known proposals.
Other features of advantage include when the free space which is bounded by the contents, on the one hand, and by the walls of the outer container and the inner bag, on the other hand, is evacuated as far as possible so as to prevent the formation of an air cushion in the vicinity of the part of the dispensing valve which is inside the container and upstream of the access to the dispensing tube, because such an air cushion would interfere with the dispensing of the contents. Evacuation is preferably effected prior to crimping of the container cover.
Moreover, the configuration of the inner bag is important. It is ensured that the bag expands progressively from bottom to top or from the bottom towards the dispensing valve, respectively, with corresponding dispensing of contents from the outer container. The discharge of the contents is therefore not inhibited by any uncontrolled expansion in the upper

REFERENCES:
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patent: 3389833 (1968-06-01), Ramis
patent: 3490651 (1970-01-01), Abplanalp
patent: 3581941 (1971-06-01), Bruce et al.
patent: 3731854 (1973-05-01), Casey
patent: 3896991 (1975-07-01), Kozlowski et al.
patent: 4032064 (1977-06-01), Giggard
patent: 4265373 (1981-05-01), Stoody
patent: 4350272 (1982-09-01), Petterson
patent: 4896794 (1990-01-01), Banks et al.

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