Dispensing – With discharge assistant – Container with follower
Patent
1978-11-30
1981-06-09
Tollberg, Stanley H.
Dispensing
With discharge assistant
Container with follower
222387, B67D 104
Patent
active
042719917
ABSTRACT:
A low pressure container for dispensing a product, even products of high viscosity, namely about 10,000 cps. or higher, at pressures of only about 6-40 lbs. per sq. in. gauge (psig). The low pressure reduces the safety hazard to practically zero, reduces the cost of the container very substantially and minimizes the use of metals, plastics and other scarce container materials. The container is provided with an internal barrier in the form of a piston, bag, disc, or the like, to separate the product from the propellant.
The container side wall is thinner than the container ends and may be relatively thin, for example in the order of 0.0015" to 0.0045" times the diameter in the case of aluminum or steel cans. The necessary thickness of other materials (such as plastic, paperboard or laminates of metal, plastic and paper) will depend on their relative tensile strengths. The use of such thin-walled containers lowers the cost of the package and at the same time renders the side wall so flexible that the side wall conforms to the piston or other barrier which helps to prevent by-pass or escape of propellant gas and also allows the internal pressure to smooth out any dents occurring during transportation. The conformation of the wall to the barrier also permits almost complete expulsion of the product. Preferably a tilt type valve is used for speedily uncovering a dispensing outlet capable of discharging the product at a flow rate of at least 0.8 grams per second.
REFERENCES:
patent: 2953284 (1960-09-01), Prussin et al.
patent: 3137416 (1964-06-01), Shepherd et al.
patent: 3245591 (1966-04-01), Kneusel et al.
patent: 3344961 (1967-10-01), Graham
patent: 3581941 (1969-09-01), Bruce et al.
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