| 摘要 |
The invention provides a packaging container producing method and producing which is able to monitor the output state of a seal heating device so that sufficient cross sealing of a web can be secured. Sealing property of a tubular web by high frequency induction heating can not be maintained in a satisfactory state unless the the peak current value, mean current value, current supplying time, heating output integration value (the square of the mean current value multiplied by the current supplying time), interval of the current supplying time, and voltage value are as a preset value. The upper and lower limits are established with respect to all these values pertaining to the heating energy of a web, wherein if any one of these values exceeds the upper limit or does not reach the lower limit, an alarm is issued or the operation of the equipment is automatically stopped. Furthermore, the history of the values pertaining to the abovementioned heating energy, which covers an appointed number of times of the past sealing operations of a tubular web, is recorded and stored, wherein it is possible to control the point of time when any defective product is produced, or useful to search for the cause thereof. Thus, by locating the values pertaining to the abovementioned heating energy within the range of the set values, the sealing reliability of a web can be assured, and no defective product is produced in the final packaging containers. |
