Page 355 - Plastics Engineering

338 Processing of Plastics

Rotating mandrel

Fig. 4.75 Filament winding of fibre composites

Fig. 4.76 'bo types of filament winding

as illustrated in Fig. 4.77). The profiled shape emerges from the die and then
passes through a tunnel oven to accelerate the curing of the resin. The pultruded
composite is eventually cut to length for storage. A wide range of pultruded
shapes may be produced - U channels, I beams, aerofoil shapes, etc.
(d) Injection Moulding: The injection moulding process can also be used for
fibre reinforced thermoplastics and thermosets, for example DMC materials.
This offers considerable advantages over compression moulding due to the
higher production speeds, more accurate metering and lower product costs
which can be achieved. The injection moulding process for thermosets has