Center sealing device for a plastic film in a packaging apparatu

Details Center sealing device for a plastic film in a packaging apparatu Center sealing device for a plastic film in a packaging apparatu

1979-11-30

1981-09-15

Culver, Horace M.

Package making

Progressively seamed cover web or web folds

With closing of web between package units

53373, 1565831, 219326, B65B 5126, B65B 906, B65B 5128

Patent

active

042889677

ABSTRACT:
A heat sealing device in a packaging apparatus utilizing a plastic film for continuously seal an overlapped axial portion of the plastic film. The device comprises a pair of heating rollers which are rotatably and oppositely placed to hold the overlapped portion of the film between them. Each of the heating rollers has a heating surface in its outer periphery which is pressed against the film and a coaxial and annular sealed chamber which is formed inside the heating surface and contains working liquid as a heat medium. A heat source is provided to be opposite at least to a portion of the sealed chamber to heat the working liquid. The working liquid generates vaporized gas upon heating by the heat source, and the pressure and the temperature in the sealed chamber are maintained at a predetermined degree so that the vaporized gas is condensed substantially at the temperature for fusing the film.

REFERENCES:
patent: 2803100 (1957-08-01), Aalseth
patent: 2882662 (1959-04-01), Campbell
patent: 3198683 (1965-08-01), Lee
patent: 3298430 (1967-01-01), Kodaira
patent: 3603767 (1971-09-01), Scicchitano
patent: 3677329 (1972-07-01), Kirkpatrick
patent: 3728518 (1973-04-01), Kodaira
patent: 3902046 (1975-08-01), Oi
patent: 3943686 (1976-03-01), Crawford et al.

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