Method and apparatus for producing sealed and filled containers
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United States of America Patent
Stats
-
Feb 25, 1992
Grant Date -
N/A
app pub date -
Oct 3, 1990
filing date -
Dec 29, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus for producing a sealed and filled container in which a preform of crystallizable plastic material having a body, a closed bottom portion and an open mouth portion is filled with the goods to be sealed therein whereafter a mechanical forming and thermocrystallizing tool is applied against the closed bottom of the preform, with pressure, to reshape the bottom of the preform by displacing at least a portion of the bottom of the preform inwardly of the body towards the open mouth of the preform. The tool is heated so that the temperature of the bottom portion is greater than the glass transition temperature (Tg) of the plastic material and the tool is maintained in contact with the bottom portion during its reshaping for a length of time sufficient for the plastic material to obtain a total crystallization of at least 15%. The open mouth portion is sealed to produce a sealed and filled container.
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