Abstract
Resin transfer moulding ( rtm ) is now a widely used technique for manufacturing fibre-reinforced plastics. Often the rtm process is carried out with vacuum assistance (mould cavity evacuation) which leads to an improvement in composite quality, in terms of appearance and mechanical properties, not generally attainable with rtm alone. However, although the use of vacuum assistance in the rtm process is well established there is very little published work relating to the subject. In this paper we have attempted to identify and investigate some possible mechanisms of improvement brought about by vacuum assistance in the moulding of glass-reinforced polyester resin systems and we discuss the effects of the increased pressure differential, moisture contamination on the glass surface, changes in the behaviour of the volatile constituents in the resin, and the effect of reducing the pressure in air pockets between the tows of glass in the preform mat.
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