| 摘要 |
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 (S 1 ) to the voltage (V) applied to the belt ( 5 ), and a second signal (S 2 ) 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 (S 1 , S 2 ); the electric resistance (R) of the belt ( 5 ) being related to the temperature (T) of the belt ( 5 ).
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