Closing plastics containers
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United States of America Patent
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-
Jun 13, 1989
Grant Date -
N/A
app pub date -
Sep 9, 1987
filing date -
Sep 12, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Thermally processable plastics tubs (10) filled with a liquid or semi-liquid product so as to leave a headspace are closed by preformed lids (12) which are heat-sealed to their peripheral flanges when the headspace is filled with steam. In order to prevent the steam from affecting the heat-sealing operation, the lid flanges are wider than the container flanges, and their projecting annular parts (29) are engaged so as to form a barrier separating the steam from the heated heat-sealing head.
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