August 17, 1998 Design News
Adhesives address complex DVD needs
Deana Colucci, Associate Editor
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
LOCTITEr 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.