When sourcing used corrugated machinery, you must prioritize mechanical integrity and production capacity. Key specs include the maximum machine speed (m/min), the effective width (e.g., 1800mm, 2200mm), and the flute profiles (A, B, C, E, or F) the machine is equipped to handle. Ensure the heating system (steam, electric, or oil) is compatible with your facility's infrastructure. Additionally, verify the PLC brand (e.g., Siemens, Mitsubishi) to ensure your local technicians can perform future maintenance and software troubleshooting.