Method of making a blown bottle with internal ribs

Details Method of making a blown bottle with internal ribs Method of making a blown bottle with internal ribs

1978-01-05

1979-04-24

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264521, 264535, 425526, B29C 1707

Patent

active

041512499

ABSTRACT:
A method of making blown plastic containers having internal ribs is disclosed. The first step of the disclosed method is to prepare a substantially amorphous blowable plastic parison such that a major portion thereof is at a temperature within the orientation temperature range of the plastic, and a strip portion has a higher modulus of elasticity than the major portion. The second step is to blow out the parison within a blow mold such that the major portion expands faster than the stiffer strip portions and interior folded ribs are formed by the strip portions and adjacent areas of the major portion. Various means of performing those steps are also disclosed.

REFERENCES:
patent: 2750625 (1956-06-01), Colombo
patent: 3125619 (1964-03-01), Miller
patent: 3256564 (1966-06-01), Welshon
patent: 3775524 (1973-11-01), Seefluth
patent: 3892830 (1975-07-01), Hudson et al.

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