Method for producing a thermoplastic container having a ring-shaped reinforcing zone at its bottom
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United States of America Patent
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Nov 3, 1987
Issued Date -
N/A
app pub date -
Mar 6, 1985
filing date -
Nov 26, 1981
priority date (Note) -
Expired
status (Latency Note)
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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.
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