Once The two substrates are bonded, either an ultraviolet (UV) beam is directed, or warmth or a tension is partly used the sealant concerning the 1st and 2nd substrates 510 and 520, for location the sealant to fix the main and next substrates 510 and 520 (action 5S in FIG. https://jiutustore.com/collections/optical-bonding-machine/Optical-Bonding-Machine