Adding a spring to the cup can play a stirring role, which is very practical for people who like to drink solid drinks such as milk tea and soy milk powder. Because these powders need to be constantly stirred and shaken during the brewing process, they can be fully dissolved. These small springs can effectively prevent the beverage from caking and improve the drinking experience.
It is worth noting that this practice may have health problems, because the production and cleaning standards of springs are not clear. Therefore, when buying and using such cups, special attention should be paid to cleanliness and hygiene.
As for the specific action principle of the spring, you can refer to professional materials or related industry reports.