When selecting a pocket spring making machine, the most critical technical factor is the production speed (springs per minute), which typically ranges from 60 to 120 ppm. You must also verify the wire diameter range (usually 1.6mm - 2.4mm) and the spring height/diameter compatibility to ensure it meets your mattress specifications. High-end models should feature ultrasonic welding technology for fabric bonding, as it provides superior strength and durability compared to traditional heat sealing. Additionally, look for machines equipped with Servo motor control systems (such as Delta or Mitsubishi) to ensure high precision and lower maintenance costs.