Thermoplastic container having a ring-shaped reinforcing zone at

Details Thermoplastic container having a ring-shaped reinforcing zone at Thermoplastic container having a ring-shaped reinforcing zone at

1989-08-03

1991-02-12

Pollard, Steven M.

Receptacles

End wall structure

One-piece side and end wall

220623, 215 1C, B65D 100

Patent

active

049917340

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 through stretching and/or reshaping has undergone flow and through 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.
The invention also relates to a method and a device for achieving the container.

REFERENCES:
patent: 3043461 (1962-07-01), Glassco
patent: 3434629 (1969-03-01), Kinslow, Jr.
patent: 4125632 (1978-11-01), Vosti et al.
patent: 4228911 (1980-10-01), Hammes
patent: 4231483 (1980-11-01), Dechenne et al.
patent: 4334627 (1982-06-01), Krishnakumar et al.
patent: 4402419 (1983-09-01), MacPherson
patent: 4403706 (1983-09-01), Mahajan
patent: 4465199 (1984-08-01), Aoki
patent: 4467929 (1984-08-01), Jakobsen et al.
patent: 4525401 (1985-06-01), Pocock et al.

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