The increasing capacity of digital versatile discs (DVDs) means greater complexity in manufacturing and replication. Tighter tolerances and the added requirements associated with bonding two disks introduce new considerations into the development process.
"The dispensing and curing of the bonding adhesive must be critically controlled to ensure that DVDs meet exacting manufacturing standards set by the industry," says Scott Tremblay, senior engineer at Loctite Corp. (Rocky Hill, CT). To meet these new challenges, Loctite developed light-curing adhesives for high-speed, economical DVD bonding. Once cured, these adhesives offer high-strength adhesion to a wide array of DVD substrates, as well as environmental resistance.
The single-component no-mix adhesives comprise 100% solids (no solvents) and can be formulated for easy integration into a variety of application and dispensing systems, including the standard spin coating and capillary-flow applications.
LOCTITE(reg) 3002, 3003, and 3004 adhesives are primarily for bonding 0.6-mm single-sided, single-layer (DVD-5); dual-sided, single-layer (DVD-10); and single-sided dual-layer (DVD-9) digital versatile discs. None of the adhesives requires a lacquer coating prior to bonding. In addition, the adhesives cure rapidly and form a tack-free surface at the edges. LOCTITE 3002 and 3003 are suited for high-speed spin coating, while LOCTITE 3004 is suitable for high-speed capillary flow.