Gravure Printing Machine Tension Control System And A New Mitsubishi Technology
Intaglio Print Plates because of their characteristics printing process so named for its fine printing quality in soft Package Industry occupied an important position. Gravure printing machine ? As the unwinding device, feed traction, host traction, traction and rolling out the device materials, whose standard is a common seven-motor system (including the winding and rewinding the automatic exchange volume). Printed in the membrane, the need to use? Given tension the material into the printing unit tension, and start running, and parking for such volumes to ensure the process of tension and stability, so as to ensure the accuracy of various colors and beautiful patterns overlay. Therefore, gravure machine-driven tension control is the control of core technology, if the stable tension control, tension fluctuation is small, the machine overlay accuracy and printing speed is high.
Tension control system structure and status of
In the membrane of the printing process, the system should control the tension mainly unwinding tension, feed tension, the material tension and winding tension, it is our usual four paragraphs talking about the tension coil in general printing color groups increased tension control achieved through version. Shaft drive system is also useful to set different colors to achieve the motor speed difference.
Tension control system generally testing, operation control and drive components:
Test parts: the part of the floating roller by the tension sensor or the composition of recent years for the floating roll paper in the process of coil tension on the material absorption is better, so the industry peers who are using the floating roller test.
Operational control: by the PLC, IPC or DSP to complete. PLC recent years a large number of popular, good cost performance, processing speed has increased annually, so do the majority of tension control by PLC. Generally floating roller signal converted by the AD directly into the PLC, the PLC for coil diameter calculation, constant speed control and tension of the PID operation section, and the results the way through the analog transmission vector DA Inverter .
Inverter control system in the entire executive body that is as driven and as tension adjusting device. Therefore, the speed control system for frequency range and precision, accuracy and dynamic response of torque and other key technologies have higher requirements.
Limitations of the traditional program and our Reform
Tension control as traditional systems is completed by a PLC, with the increase of printing speed (100? 300m/min), the increase in volume than the diameter (600 ~ 1500mm), the increase in printing color groups (the original 6 colors to 13 colors), and the auxiliary control points of the increase (pressure roller, fans and ink viscosity control), the scanning cycle of the PLC’s CPU in terms of operation, gradually unbearable task, even if? some auxiliary control to move The other?-PLC to complete, but the four sections of the actual computation time required for tension with the more advanced PLC (such as Mitsubishi’s FX-3U or SIEMENS the S7-300) must be really close to 20ms scan cycle.
So we started trying to reform the traditional single-CPU structure of tension, the introduction of multi-CPU, single Jiang algorithm to calculate the direct control of the paragraphs of tension and adjust drive frequency Song tension, that is, according to the type of control or need for each CPU the his duties, an important link to improve processing performance. Mitsubishi launch own take-up function vector converter A740? A1, in the study of the Mitsubishi device information, we believe that the introduction of the take-up frequency after all? Worth a good program to test.
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