Package making – Progressively seamed cover web or web folds – With closing of web between package units
Patent
1979-12-03
1981-09-15
Culver, Horace M.
Package making
Progressively seamed cover web or web folds
With closing of web between package units
53373, 53552, 1565831, 219326, B65B 5130, B65B 5128, B65B 906
Patent
active
042889685
ABSTRACT:
A heat sealing device in a packaging apparatus utilizing a plastic film for continuously seal both ends of a plurality of cylindrical bags made from the plastic film. The device comprises a pair of heat sealing members provided separatably and oppositely against each end portion of each cylindrical bag which is to be sealed transversely across the film. Each heat sealing member has a heat sealing surface which is to be pressed against the film and at least a pair of sealed chambers inside the heat sealing surface containing working liquid as a heat medium. A heat source is provided to heat at least a portion of the sealed chamber so that the working liquid generates vaporized gas by the heat. The sealed chamber is controlled to be kept at a pressure and a temperature so that the vaporized gas is condensed substantially at a temperature under which the film is sealed.
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Ichikawa Mamoru
Seko Kiyoshi
Benoit John E.
Culver Horace M.
Fuji Machinery Co. Ltd.
Japan Packaging Machinery Manu. Assn.
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