| 摘要 |
The integrity of a seal in packaging film is monitored during packaging of loose, free flowing product and adaptive control of the packaging method/apparatus is provided in response to the determination made. The pressure being exerted between the sealing jaws upon reaching a closed position and the seal being formed is monitored and analyzed to evaluate the seal integrity in a dedicated microprocessor. An adaptive, real time signal is provided to a CPU/controller to adjust the relative product flow and packaging film movement. During the operation routine, a design torque threshold is determined with the start-up of the operation or the machine, the input torque signal from the microprocessor is compared to the torque threshold and a good seal is indicated if the torque is less than the design torque threshold and as a result a good seal is indicated and the packaging operation is allowed to continue. If the torque of the servo motor is within a first range above the threshold a marginal, but acceptable seal is indicated and the operation continues, unless the marginal seal is noted three consecutive times, in which case the operation is interrupted by a pause. When a torque in a second range above the first is denoted, interruption of the operation occurs. Adaptive control is provided through a CPU/controller in response to the level of torque and/or a separate product charge sensor positioned along the transitional flow path of the product. <IMAGE> |
