Thermoplastic container having a ring-shaped reinforcing zone at its bottom
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United States of America Patent
Stats
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Feb 12, 1991
Issued Date -
N/A
app pub date -
Aug 3, 1989
filing date -
Nov 26, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
First Claim
Other Claims data not available
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International Classification(s)
Cited Art Landscape
Patent Citation Ranking
- 11 Citation Count
- B65D Class
- 0 % this patent is cited more than
- 34 Age