1, improper adjustment or operation of packaging machine leads to uneven packaging. Inaccurate setting of sealing time, temperature or pressure leads to unstable or uneven sealing. In addition, the mechanical parts of the machine, such as conveyor belt or sealing machine, are faulty or worn, which will also affect the cleanliness of the packaging.

2. The quality or size of the packaging bag is inconsistent, resulting in uneven packaging. The size of the packaging bag is not suitable, or the material of the bag is uneven, which will affect the beauty of the packaging.