Design and Performance Evaluation of PLC Based Automation System for Strip Packaging Machine

Author (s):

  1. D. D. Vyas, Darshan Institute of Engineering & Technology, Rajkot,
  2. D. R. Bhojani, Government Engineering College, Rajkot, Rajkot
  3. P. C. Gohel, Darshan Institute of Engineering & Technology, Rajkot


Strip packaging machines are very common in pharmaceutical industries. In a conventional non-automated strip packaging machine the process of tablet drooping and strip cutting is performed using mechanical system based on cams. Basic drawback of such machines is that, mechanical parts have to be changed every time the product changes or the strip specification changes. This involves time and requires expertise. Also it involves lots of wastage in initial setting. This paper presents system automation of such strip packaging machine using programmable logic controller (PLC). As a part of solution the process of tablet dropping and strip cutting is automated. Main elements used in the proposed system include PLC, human machine interface (HMI), rotary encoders, proximity sensors and pneumatic system. Ladder diagram has been used to design system software. Field trial of proposed machine was taken for period of around two months and its performance is compared with the conventional machine. It is observed that for every new batch process as the proposed system do not need major change of mechanical parts it leads to saving of around 80% time in fitting and initial calibration. It also substantially reduces wastage of tablets and packing material and provides more precise operation compared to conventional machine.

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