Barrier can prefill seal

Details Barrier can prefill seal Barrier can prefill seal

1990-01-12

1991-11-19

Shaver, Kevin P.

Dispensing

Processes of dispensing

222386, 222389, 277DIG6, B65D 8314

Patent

active

050659006

ABSTRACT:
A method for preparing and improving a container for dispensing a product under pressure, using a piston to separate gas and product. This piston is free to move along a can side wall. Free pistons, as they are usually called, have not been functional for many products, notably those which readily absorb gases. To prevent gas migration by passage of gas around the piston, a material or prefill is introduced through the top opening into the area of can above a piston. The prefill is then forced down under pressure along the margin of piston and can wall prior to the filling of the can. The amount of prefill depends on piston diameter and may vary from three grams for a 35MM piston up to ten grams for a 53MM size piston.

REFERENCES:
patent: 3233791 (1966-02-01), Miles
patent: 3354792 (1967-11-01), Fuchs
patent: 3381863 (1968-05-01), Towns
patent: 3563258 (1971-02-01), Hechler

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