Importance

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Abstract

A method of manufacturing and using a plastic bottle for dispensing thick, viscous liquids while preventing the drying and thickening thereof. The bottle is manufactured by attaching a top edge of a thin-walled, plastic, liquid-containing bag to a cylindrical collar; rolling the bag on the collar to form the bag into a long, thin roll extending from the collar; inserting the rolled bag through the neck portion of a closed hollow bottle body having sidewalls of a squeezable, self-restoring plastic and a cylindrical neck portion extending therefrom; attaching the collar to the top of the neck portion of the bottle body; and, providing a one way valve in the bottle to allow air into the space between the inside of the bottle body and the bag but not allow it out. After filling the bag with the liquid, the bottle is used by periodically, repeatedly squeezing the bottle body to pressurize air thereby pumped through the valve into the space between the inside of the bottle body and the bag and thereby force the bag against the liquid in the bag under pressure whereby the area of the liquid exposed to air in the bag is minimized and the liquid if forced out of the bag under pressure. The valve is a duckbill valve disposed in a tube extending from the collar or in a bore through the bottle body.

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First Claim