It mainly relies on the method of observing the appearance characteristics to identify the paper cup, and the good paper cup will generally be tested as follows:
Functional test: Test whether a paper cup can hold a liquid, such as water
Performance test: Test whether the paper of the cup is thick enough and not easy to deform
Pressure test: Liquid filled paper cup will not break
Recoverability test: Whether the paper cup can be restored to its original form after filling the liquid and pouring it out
Strength test: Whether the paper cup will soften and damage after holding the liquid for a period of time