Title: Pressurized barrier pack

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Abstract: The invention provides a low pressure package or packaging system for dispensing a product of high viscosity, namely, 10,000 cps. or above at a pressure 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 materials. The container is preferably provided with a barrier in the form of a piston, bag, disc or the like, to separate the product from the propellant. By reason of the low pressure, the wall of the container can be relatively thin, of the order of 0.005 inch or less in the case of aluminum in 2-inch diameter containers. The necessary thickness of materials other than aluminum (such as steel, plastic, paper board or laminates of metal, plastic and paper) will depend on their relative strengths. The use of such thin-walled containers lowers the cost of the package and at the same time renders the wall so flexible and pliable that the wall conforms to the piston or disc barrier which helps to prevent by-pass or escape of propellant gas and also allows the pressure inside to smooth out any dents occurring during transportation. The conformation of the wall to the barrier also permits almost complete expulsion of the product. The valve is provided with a sealing disc or head secured to a tiltable stem. The sealing disc is of considerably larger diameter than those of prior valves, and maybe three or four or more times the internal diameter of the stem. The disc hinges on a small portion of its perimeter to provide a passageway for the product extending throughout 360.degree..


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