Method and unit for wrapping an article in a sheet of...

Details Method and unit for wrapping an article in a sheet of... Method and unit for wrapping an article in a sheet of...

2005-06-07

2005-06-07

Leung, Philip H. (Department: 3742)

Electric heating

Inductive heating

With heat exchange

C219S663000, C219S667000, C219S653000, C053S463000, C053S557000, C156S272400, C156S379600

Reexamination Certificate

active

06903315

ABSTRACT:
In a method for wrapping an article in a sheet of thermoplastic wrapping material, the temperature of an at least partly metal belt (5) looped and induction heated to seal wrapping material (4) is detected by detecting a first signal (S1) to the voltage (V) applied to the belt (5), and a second signal (S2) related to the current (I) circulating along the belt (5); and by calculating the electric resistance (R) of the belt (5) as a function of the first and second signal (S1, S2); the electric resistance (R) of the belt (5) being related to the temperature (T) of the belt (5).

REFERENCES:
patent: 2989691 (1961-06-01), Cook
patent: 3883386 (1975-05-01), Garbini et al.
patent: 4317979 (1982-03-01), Frank et al.
patent: 4474825 (1984-10-01), Schmidt
patent: 4668851 (1987-05-01), Küpper
patent: 16 48 200 (1971-05-01), None
patent: 2 665 535 (1992-02-01), None

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