... stable. (3)ultrasonic quilting machine of mattress bed cover Technical parameter Model NK-JM2012Frequency 15KHZ,Output ... 6800KG (4)ultrasonic quilting machine of mattress bed coverApplied range Car tarpaulin, Car seat covers, luggage handbags, footwear shoes, ... clothing coat, children jacket, pillow, quilt, mattress bed cover, ...