Package making – Closing packages and filled receptacles – Separate closure applying
Patent
1980-06-13
1982-08-24
Culver, Horace M.
Package making
Closing packages and filled receptacles
Separate closure applying
53298, 53373, B67B 304, B65B 5114, B65B 728
Patent
active
043454127
ABSTRACT:
Apparatus is provided for automatically applying and heat-sealing a lid of thermoplastic film to the top of a cup. The film is supplied in a roll and the leading end is fed into a position between the top of the cup and a heat-sealing head. When the apparatus is run through an operating cycle, the cup and the head are brought together to seal a section of film to the rim of the cup and sever the section from the roll. The head is characterized by an annular heated cushion and a slitting device to from a slit in the center of the lid which enhances the seal, particularly if the cup contains a hot liquid. In an alternative arrangement, the slitting mechanism is located along the path of the film and the center of the head is constructed to prevent exposing the center of the lid to high temperature. A leakproof cup is provided in which a disposable cup is closed by a heat-sealed section of film that is relatively tight in the vicinity of the rim and relatively slack in the center in which a short, straight slit is formed.
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Balzer Winton E.
Knobel Kenneth M.
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