Method for blow molding a container having a concave bottom

Details Method for blow molding a container having a concave bottom Method for blow molding a container having a concave bottom

1975-06-16

1977-07-19

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264296, 425525, 425526, B29C 1707

Patent

active

040369269

ABSTRACT:
A method of making a concave bottom on a blown thermoplastic container. A blowable pre-form is initially expanded against a composite mold surface defined by the end faces of a plurality of concentric tubes surrounding a central actuating rod. The rod and the tubes are initially telescopically positioned to define a composite concave surface, so that a first convex bottom is blown. Subsequently, the rod and tubes are actuated telescopically to progressively invert the convex bottom to a concave shape. The end faces of the tubes may be grooved to define reinforcing ribs in the concave bottom wall, if desired.

REFERENCES:
patent: 1967245 (1934-07-01), Hothersall
patent: 2188365 (1940-01-01), Lent et al.
patent: 2372418 (1945-03-01), Forbes et al.
patent: 3692454 (1972-09-01), Kruger
patent: 3764644 (1973-10-01), Robinson
patent: 3819789 (1974-06-01), Parker
patent: 3865530 (1975-02-01), Jesselallee et al.

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