| 摘要 |
<p>A form-fill-seal type packaging machine with a transverse sealer (10) having a pair of seal jaws (12,14) is initially operated for a number of cycles without introducing any articles to be packaged into bags which are being formed from an elongated thermoplastic film (W), and values of a selected physical variable indicative of the separation between the seal jaws are detected. From an average of these detected values and known variations in the thickness of the film, a standard range is determined for the selected physical variable. When the packaging machine is operated thereafter with articles introduced into the bags, the same physical variable is measured as each bag is transversely sealed and, if the measured value is outside the standard range, a warning is outputted or the film is not cut across the sealed position into two separated packages. The physical variable to be selected may be the torque on the motor which serves to move the seal jaws towards each other. <IMAGE></p> |
