When sourcing these machines, prioritize Flexographic or Rotogravure printing technologies, as they are most compatible with non-porous substrates like cellophane. Key specs include printing width (typically 600mm-1200mm), printing speed (aim for 50-150m/min for efficiency), and the number of colors (usually 2 to 8 colors). Ensure the machine features a high-precision tension control system and electronic web guiding to prevent the thin cellophane film from stretching or wrinkling during high-speed runs.