Bottles and jars – Ejecting – Siphon type
Patent
1976-01-02
1977-05-24
Norton, Donald F.
Bottles and jars
Ejecting
Siphon type
B65D 102
Patent
active
040249751
ABSTRACT:
Plastic containers having internal reinforcing ribs are formed by a molding operation including pre-blow and final-blow steps. The pre-blow step includes inflating a blowable plastic parison into contact with the cavity walls of a first blow mold to form a blown pre-form, the cavity walls of the first blow mold including a plurality of concave grooves to form a pattern of convex or protuberant ribs on the outer-periphery of the pre-form. The final-blow step includes positioning the blown, ribbed pre-form within a second or final blow mold having a cavity defined by substantially smooth wall surfaces conforming to the exterior configuration of the desired container. Next, the pre-form is blown to stretch and expand against the cavity walls of the second mold, during which step the convex ribs on the exterior of the pre-form are flattened, forming concave portions intermediate convex reinforcing ribs on the internal wall surface of the container.
REFERENCES:
patent: 3029963 (1962-04-01), Evers
patent: 3114932 (1963-12-01), Donnelly
patent: 3137748 (1964-06-01), Makowski
patent: 3536500 (1970-10-01), Cleereman
patent: 3944124 (1976-03-01), Hexel
Heberling Richard D.
Holler E. J.
Norton Donald F.
Owens--Illinois, Inc.
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