Method of making a blown bottle having a ribbed interior surface

Details Method of making a blown bottle having a ribbed interior surface Method of making a blown bottle having a ribbed interior surface

1974-09-16

1976-05-11

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Reactive gas or vapor treatment of work

Work is organic material

264 97, 264 98, 264296, 425DIG214, 425DIG215, B29C 1707

Patent

active

039564410

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 proturburent 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: 3114932 (1963-12-01), Donnelly
patent: 3420924 (1969-01-01), Mason et al.
patent: 3754851 (1973-08-01), Reilly et al.

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