초록 ▼

A pressurized thin walled expandable can from which a fluent pressurized product is dispensed is made from an expandable can wall and a barrier, which may be a fully evertable bag having uniform thickness and flexibility and shaped to fit within the can wall. The open end of the bag is mounted to th

A pressurized thin walled expandable can from which a fluent pressurized product is dispensed is made from an expandable can wall and a barrier, which may be a fully evertable bag having uniform thickness and flexibility and shaped to fit within the can wall. The open end of the bag is mounted to the can wall by apparatus which maintain a seal as the can wall expands and returns to its unexpanded condition. As product to be dispensed is introduced into the product chamber, the flexible bag is extended down into the lower end of the can. As the product is later expelled through a discharge opening, the flexible bag, which may be plastic, is fully everted into the upper end of the can to expel all the product. The can is thin walled, so that when pressurized, the can diameter expands by at least one one-thousandth (1/1000) of its unexpanded value. In one embodiment, the bag is mounted by a ring inside the can. The ring includes a portion which expands to maintain the seal with the expanding can side wall. In another embodiment the ring is rigid, but of slightly larger diameter than the can. This ring stretches the can, so as to maintain the sealing contact with the can as the can expands. In other embodiments, the bag may be mounted by a stretchable adhesive and, if the bag is slightly elastic, it may be mounted by an adhesive or by a melt seal process such as heat sealing.

대표청구항 ▼

A pressurizable container for containing a fluent product under pressure and for dispensing the product through a discharge opening, said container comprising: a can wall surrounding and defining a can chamber and having an upper end with the discharge opening defined therein and an opposite lower e

A pressurizable container for containing a fluent product under pressure and for dispensing the product through a discharge opening, said container comprising: a can wall surrounding and defining a can chamber and having an upper end with the discharge opening defined therein and an opposite lower end; the can wall being resilient and expanding slightly when the can chamber is pressurized and returning to an unexpanded condition as the pressure in the can chamber is reduced to zero; the can wall having a dimension across the can chamber which increases by at least approximately one one-thousandth (1/1000) of its value in the unexpanded condition as the pressure in the can chamber goes from the unexpanded condition to a pressure of 100 psi; a flexible barrier having an edge mounted to the can wall in the can chamber, the barrier dividing the can chamber into a product chamber comprising a part of the can chamber between the barrier and the upper end of the can wall for containing a fluent product to be stored and dispensed and a propellant chamber comprising a part of the can chamber between the barrier and the upper end of the can wall for containing a propellant adapted to provide pressure upon the barrier to urge the barrier into the product chamber for expelling the product through the discharge opening; the barrier comprising material that is impervious both to the product and propellant; and means for mounting the edge of the flexible barrier to the can wall in a manner that seals the barrier to the can wall for preventing the product and propellant from leaking past the edge of the barrier as the can wall expands and returns to the unexpanded condition; the flexible barrier being extendible toward the lower end when the product chamber is initially filled with fluent product and being gradually extensible toward the upper end through pressure generated by propellant in the propellant chamber to expel the fluent product out of the can chamber through the discharge opening.