Spray-up - Covers a number
of techniques in which a spray gun is used as the
processing tool. In reinforced plastics, for example,
fibrous glass and resin can be simultaneously deposited
in a mold. In essence, roving is fed through a chopper
and ejected into a resin stream which is directed
at the mold by either of two spray systems. In foamed
plastics, very fast-reacting urethane foams or epoxy
foams are used in liquid streams to the gun are sprayed
on the surface. On contact, the liquid starts to foam.
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