Non woven fabric is a widely used material in daily life, which is widely used due to its soft, comfortable, breathable and other characteristics. Ultrasonic lace machine is a commonly used welding tool for non-woven materials. During the production process, if the welding of non-woven fabrics is not firm and they will rot upon tearing, there may be several reasons:

1. Unqualified raw materials: Firstly, it is necessary to check whether the non-woven fabric materials used comply with relevant national standards, such as fiber quality, density, thickness, and other indicators that meet the requirements. If the quality of non-woven fabric is poor, it will lead to unstable welding.

2. Inappropriate ultrasonic frequency: The working frequency of the ultrasonic lace machine determines the size of welding energy. If the frequency is too low, the welding quality is poor and the welding points cannot be fully bonded. If the frequency is too high, the welding point is prone to burning. Therefore, it is necessary to adjust the ultrasonic frequency based on the non-woven fabric material used.

3. Insufficient welding time: If the welding time is insufficient, the melting of the welding points is not sufficient, resulting in unstable welding and easy tearing. Therefore, when welding, it is necessary to extend the welding time appropriately to ensure that sufficient melting state is reached.

4. Welding temperature too high: If the welding temperature is too high, the non-woven fabric is prone to melting and deformation, resulting in unstable welding points. Therefore, when welding, it is necessary to reduce the welding temperature appropriately to ensure that the solder joints achieve sufficient adhesion.

We can take the following measures to address the above issues:
1. Quality supervision: Strengthen the quality inspection of raw materials to ensure the use of non woven materials that meet standards.

2. Adjust the ultrasonic frequency: Adjust the ultrasonic frequency based on the non-woven fabric material used to achieve the best welding effect.

3. Extend welding time: According to the thickness and hardness of the non-woven fabric material, extend the welding time appropriately to ensure sufficient melting state is reached.

4. Reduce welding temperature: According to the characteristics of non-woven materials, reduce the welding temperature appropriately to ensure the firmness of the welding points.