RESIN TRANSFER MOULDING: (RTM):
It
is an adaptation of Marco process.
Reinforcing
material used is commonly continuous strand, glass fiber mat.
Process:
The
reinforcing mat is clamped between the two halves of a male and female mould.
The room temperature cured and catalyzed resin is injected through the
injection ports, displacing the air through the other ports. Usually the resin
is injected at the bottom and the air is ejected (exits) through the top ports
which have transparent tubing inserts. So that when resin is seen in the
tubing, injection can be stopped.
COLD
PRESS MOULDING: (Variation in RTM)
Here
the reinforcement is placed in the female half and the
catalyzed resin is poured into the reinforcement. The mould is then closed so
that the resin is distributed. The male and the female mould tightly fits in
each other. Most uniform resin distribution is determined empirically and then
consistency is accomplished easily.
Advantage
(of both RTM and cold press moulding):
a.
Smooth
surfaces on both sides of the part.
b.
Fast
cycles.
c.
Lower
part cost.
d.
Uniform
wall thickness.
e.
Good
dimensional control.
f.
Low
cost plastic moulds can be used because high pressures are not involved.
g.
Process
is particularly adaptable for moderate quantities of large parts.
Up to 100 lb or ft2
in area.
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