A Good Paper Cup Usually Undergoes The Following Testing And Quality Inspection

Functional testing: Test whether the paper cup can hold liquids, such as water
Performance testing: testing whether the paper in the paper cup is thick enough and not easily deformed
Pressure test: Will the paper cup break when filled with liquid
Recoverability test: After filling the liquid and pouring it out, can the paper cup be restored to its original state
Strength test: Will the paper cup soften and damage after being filled with liquid for a period of time
Appearance test: Whether the shape of the paper cup is beautiful and whether the pattern is beautiful
Usability test: Check if the paper cup feels good, has a good taste, and does it prick the mouth when used
Safety test: Will the cup deform and spill liquid onto the user after being filled with water and picked up