1. The inner membrane of the cup should not be uneven
The ideal paper cup, the inner layer of the film will be very uniform, the wax film or plastic film is very smooth. By means of the light, taking a proper angle and observing the spraying of the inner film of the paper cup can be judged with the naked eye.
2. The outside of the cup is within 15 mm from the cup mouth. It is strictly forbidden to print any pattern. The country has detailed regulations on the material, shape and additives of the paper cup. Among them, there is a printing standard for the cup body pattern.
According to the national standard, it is strictly forbidden to print any pattern on the outside of the cup body within 15 mm from the cup mouth.
3. Paper cups have no nose and smell
Sometimes the cup that I bought looks good, but it smells bad, and it is the sour taste of the femoral nose. There is a possibility that the paper material is moldy.
