When evaluating tea bag machines, focus on the packaging speed (bags per minute), filling range (grams per bag), and sealing method. High-end models utilize ultrasonic sealing for pyramid bags to ensure a clean finish without adhesives. Ensure the machine supports PLC control systems (like Siemens or Delta) and touchscreen interfaces for precise adjustment of bag length and filling weight. Additionally, verify the material compatibility, such as the ability to handle filter paper, non-woven fabrics, or corn fiber (PLA) mesh.