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When operating a twin-screw pelletizer, special attention must be given to the main machine to ensure stable performance. Key precautions include maintaining proper current levels, monitoring pressure sensors, and checking lubrication oil pressure. Shutdown operations fall into two categories: normal shutdown and emergency shutdown. Normal shutdown involves gradually stopping feeding, reducing screw speed, and turning off auxiliary equipment. In case of an emergency, the operator should press the emergency stop button and cut off power immediately before troubleshooting the issue.