Once The two substrates are bonded, both an ultraviolet (UV) beam is directed, or heat or a tension is partly used the sealant involving the main and second substrates 510 and 520, for setting the sealant to fix the first and second substrates 510 and 520 (step 5S in FIG. https://jiutustore.com/collections/optical-bonding-machine/Optical-Bonding-Machine