Selecting a biodegradable bag machine requires a deep understanding of material compatibility and mechanical precision. Unlike traditional plastic, biodegradable materials like PLA, PBAT, and cornstarch blends have lower melting points and different viscosity levels. You must ensure the machine features a specialized screw and barrel design to prevent material degradation. Additionally, prioritize machines with high-precision tension control systems and servo motor drives to maintain film stability, as biodegradable films are often more sensitive to stretching and heat during the sealing process.