... . Characteristics 1. Built-in PC chips, multi-circuit ultrasonic protection system to make the machine run safely;2. ... machine reaches international level with automatic frequency tracking system and ultrasonic soft-starting technology;4. Variety of roller patterns, ... and fabric, nonwoven fabric, spun-bonded cotton, thermoplastic film, chemical plastic piece. such as nylon, polyster, ABC, PC, PVC, PE ...