... frequency : 20KHzWorking temperature : -10-28CWorking speed : 0-20m/minEquipped pattern mould : 0-80 mmSize of machine ( L * W * H ) ... directly, without loose edge and hole.4.This machine use ultrasonic for cover sewing, pressing and embossing, the design ... Pillowcase/Pillow Slip, Automobile Cover, Packing string, Knapsack, Travelling Bag, Portable Shopping Bags, Curtains, Raincoat, Wind Coat, Snow ...