Package making – Closing packages and filled receptacles – Separate closure applying
Patent
1988-10-07
1990-07-17
Culver, Horace M.
Package making
Closing packages and filled receptacles
Separate closure applying
53329, 53373, 53DIG2, 53510, 1563797, 156 69, B65B 5122, B65B 5114, B65B 728
Patent
active
049413066
ABSTRACT:
A method and apparatus for sealing a flat lid with a lower layer of heat bondable material onto the upper, generally flat surface of a flange extending around the periphery of an access opening in a container of the type used to store a substance susceptible to deterioration when exposed to atmosphere for a prolonged time such as prepared foods, which method and apparatus moves a separate and distinct heating unit with a downwardly facing heating ring in a preselected path, preferably circular in shape, between first and second positions, includes a generally fixed high frequency power supply for energizing said heating ring, connects this fixed high frequency power supply to the individual heating rings of the moving heating unit only when the unit is moving between the first and second positions, and energizes the power supply only while the heating unit is moving between the first and second positions. The ring is forced against the lid as the power supply is energized and is released from the ring from the lid after the power supply has been de-energized and before the moving heating unit reaches the second position. Preferably the ring is an inductor and the plurality of heating units are carried by a turret to define individual heating stations on the turret which stations rotate to selectively energize the individual heating units by the single fixed high frequency power supply whereby single power supply energizes a plurality of separate heating stations.
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Adams Graham R.
Balzer Norbert R.
Currie John P.
Kubis Charles S.
Pfaffmann George D.
Continental Can Company Inc.
Culver Horace M.
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