Method for producing a thermoplastic container having a ring-sha

Details Method for producing a thermoplastic container having a ring-sha Method for producing a thermoplastic container having a ring-sha

1985-03-06

1987-11-03

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264532, 264531, 264533, 264534, 264292, 264296, B29C 4900, B29C 4912, B29C 5522, B29C 5700

Patent

active

047042435

ABSTRACT:
A container (30d) of polyethylene terephthalate or similar thermoplastic material has a container body (32d), a mouth portion (37d) and a central bottom part (34d). The central bottom part consists of chiefly amorphous and/or thermocrystallized material and forms a bulge directed towards the interior of the container. A ring-shaped or band-shaped standing surface (36d) is arranged adjacent the transition of the bottom part into the container wall (32d). Adjacent to the standing surface the container has a circumferential area of material (35d) which by stretching and/or reshaping has undergone flow and by heating has acquired built-in stresses which tend to contract it. The surrounding circumferential area of material prevents the inward bulge of the central bottom part from straightening out and/or turning inside out when the pressure in the container is increased and/or when the temperature of the container material is raised.

REFERENCES:
patent: 3733309 (1973-05-01), Wyeth et al.
patent: 3981668 (1976-09-01), Farrell
patent: 4035455 (1977-07-01), Rosenkranz et al.
patent: 4177239 (1979-12-01), Gittner et al.
patent: 4412966 (1983-11-01), Yoshino et al.
patent: 4467929 (1984-08-01), Jakobsen et al.
patent: 4496517 (1985-01-01), Kinoshita et al.

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