Palomar has developed in-situ ultraviolet curing on its automated precision assembly die bonding equipment. With in-situ UV curing, parts that are too delicate to move are set in place immediately and cured with UV epoxy to avoid drifting out of position. When there are tight tolerances, moving an uncured part into an oven can cause part shifting or swimming. With Palomar’s system, the bond tool is in contact with the part during the entire process and does not releaseit until the adhesive has a-chieved a minimal „tack“ cure. This ensures that the part will not swim from its original placement. The in-situ cell avoids problems inherent with snap- cure methods such as out gassing, very small batch sizes and short adhesive potting times. Snap-cures are two-part epoxies that can produce heat. Such heat can cause outgassing, producing fumes which can cloud a lens that needs to be optically transparent, or it can cause cracking.
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