A pressure container comprising axially extending side walls formed of plastic extending between a top end and a bottom end. A metal top is attached at a top seam in pressure-containing relation to the top end of the side walls, and a metal bottom attached at a bottom seam in pressure-containing rel
A pressure container comprising axially extending side walls formed of plastic extending between a top end and a bottom end. A metal top is attached at a top seam in pressure-containing relation to the top end of the side walls, and a metal bottom attached at a bottom seam in pressure-containing relation to the bottom end of the side walls. Optional top and bottom beads are formed in the side walls to aid in sealingly securing the metal top and bottom to the side walls. A method for containing pressurized materials by providing and filling such a pressure container is also shown.
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The invention claimed is: 1. A pressure container comprising: a. axially extending side walls formed of plastic extending between a top end and a bottom end, wherein the side walls include at their top end a top bead that is thicker than the adjacent portion of the side walls and extends radially o
The invention claimed is: 1. A pressure container comprising: a. axially extending side walls formed of plastic extending between a top end and a bottom end, wherein the side walls include at their top end a top bead that is thicker than the adjacent portion of the side walls and extends radially outward therefrom; b. a metal top attached at a top seam in pressure-containing relation to the top end of the side walls, the top seam being between the metal top and top end of the side walls; and c. a metal bottom attached at a bottom seam in pressure-containing relation to the bottom end of the side walls; wherein the side walls have at their top end a necked-in portion contacting an end of the metal top and extending to the top seam and a side wall maximum diameter below the necked-in portion, the necked-in portion extending radially inwardly from the side wall maximum diameter sufficiently that the top seam is entirely inward of the side wall maximum diameter, and the end of the metal top is also entirely inward of the side wall maximum diameter and below the top bead; and wherein the side walls extend radially inwardly for no more than the amount that decreases the side wall diameter by 20 percent of the side wall maximum diameter. 2. The pressure container of claim 1, wherein the side walls are manufactured by an extrusion process. 3. The pressure container of claim 1, wherein the side walls are manufactured by an injection molding process. 4. The pressure container of claim 3, wherein the side walls include at their bottom end a bottom bead that is thicker than the adjacent portion of the side walls, and the metal bottom includes at its periphery a clamping rim that encloses and seals against the bottom bead to form the bottom seam. 5. The pressure container of claim 4, wherein the bottom bead extends radially outwardly from the side walls. 6. The pressure container of claim 3, wherein the metal top includes at its periphery a clamping rim that encloses and seals against the top bead to form the top seam. 7. The pressure container of claim 1, wherein the necked-in portion extends radially inwardly for no more than the amount that decreases the side wall diameter by 15 percent of the side wall maximum diameter. 8. The pressure container of claim 7, wherein the necked-in portion extends radially inwardly for no more than the amount that decreases the side wall diameter by 8 percent of the side wall maximum diameter. 9. The pressure container of claim 1, wherein, at the top end of the side walls, the top bead is provided forming a part of the necked-in portion that is thicker than the adjacent parts of the necked-in portion, and the metal top includes at its periphery a clamping rim that encloses and seals against the top bead to form the top seam. 10. The pressure container of claim 1, wherein the side walls include a primary pressure-containing layer that is made of a plastic selected from the group consisting of PET, PEN, polycarbonate, polyacrylamide, and mixtures thereof. 11. The pressure container of claim 10, wherein the side walls include, in addition to the primary pressure-containing layer, at least one modifying plastic layer made of a plastic different from that of the primary pressure-containing layer. 12. The pressure container of claim 11, wherein a modifying plastic layer is internal to the primary pressure-containing layer and is made of a plastic selected from the group consisting of PEN, nylon, EVOH, acrylonitrile methyl acrylate copolymers, and mixtures thereof. 13. The pressure container of claim 11, wherein the side walls are made by a co-extrusion process. 14. The pressure container of claim 1, wherein the side walls are cylindrical below the necked-in portion. 15. The pressure container of claim 14, wherein the side walls are without any radially inward extensions at the top or bottom ends that extend inwardly for more than the amount that decreases the side wall diameter by 15 percent of the side wall maximum diameter. 16. The pressure container of claim 15, wherein the side walls are without any radially inward extensions at the top or bottom ends that extend inwardly for more than the amount that decreases the side wall diameter by 8 percent of the side wall maximum diameter. 17. The pressure container of claim 1, wherein the container is an aerosol pressure container. 18. The aerosol pressure container of claim 17, wherein the side walls also have an enlarged bulbous bottom end.
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