Reason:
1. Poor quality of raw materials: If the double-layer fabric used is of poor quality and one side lacks elasticity, wrinkles are prone to occur.
2. The distance between the ultrasonic sensor and the pressure roller is not appropriate: The distance between the ultrasonic sensor and the pressure roller is a crucial step when welding double-layer fabrics, and if the distance is not appropriate, wrinkles can also occur.
3. Excessive welding speed: Excessive welding speed is also one of the reasons for wrinkles, because when the welding speed is too fast, ultrasonic energy cannot be evenly transmitted to the entire fabric.

Solution:
1. Choose high-quality raw materials: In order to avoid wrinkles caused by insufficient elasticity of the fabric, it is best to choose high-quality and elastic double-layer fabric.
2. Adjustment of the distance between the ultrasonic sensor and the pressure roller: When adjusting the distance between the ultrasonic sensor and the pressure roller, it is necessary to accurately grasp. If the distance is appropriate, the welding will not only be wrinkle free, but also have a more beautiful lace effect.
3. Control welding speed: Reasonably control the welding speed to fully transmit ultrasonic energy, thereby avoiding wrinkles and other unattractive effects.

In short, as an efficient, environmentally friendly, and energy-saving welding machine, the use and adjustment of ultrasonic lace machines are very important for welding quality. As long as you pay attention to the above three points, as well as keep the machine clean, regularly maintained, and maintained, you can effectively avoid wrinkles and other unattractive situations.