Capping of test cup refers to the use of capping machine to tightly install the cap on the test cup to ensure that the liquid in the test cup will not overflow or be polluted by the outside.Working principle of test cup capping machine: 1. Prepare the test cup and lid: put the test cup and lid respectively into the feeding port of the machine, and the machine will send them into the capping work area respectively.2. Gland: the machine will adjust the appropriate pressure