WET
LAY UP TECHNIQUE:
It
is the simplest method, where continuous lengths of mats, fabrics or rovings
are passed through a resin bath and through squeeze rolls. This process is used
where material are required for immediate use or only in small or moderate
quantities. The final product is usually quite tacky and somewhat difficult to
handle especially when stored as rolls.
PREPEGS
OR B-STAGED MATERIALS:
Here
the fibers are drawn through a bath, squeeze rolls and then through one or more
heating zones. In the heaters the laminate is stripped off solvents and other
volatiles and then the resin is advanced to the B-stage so that relatively dry
and only slightly tacky material results. The degree of B-staging achieved is a
function of the temperature, speed of travel, resin content, and the resin
type.
This
process is used for laminates to be cured at high temperature or by UV
radiation and usually result in material having relatively long shelf lives and
can be easily handled and stored. The final product is known as a pre
impregnated fabric or roving.
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