Resin transfer moulding is a profitable technique for natural fibre composites. In this technique, resin and hardener are pumped separately to the mixing head before injection into the mould. The required amount of resins injected into the prear­ranged fabrics. Pressure can be applied from the opposite direction of injected mould. The wastage of resin is very less and good shape of product is found by this method. Indira et al. (2013) studied the effect of fibre length and fibre loading on the properties of banana fibre-reinforced phenol formaldehyde resin (PFR) composites. They found greater tensile and flexural properties in resin transfer moulded compos­ites than in compression moulded composites. However, it needs big investment for large-scale production.

10.3.2.3 Bulk Moulding

A male-female combination of a closed mould is needed for bulk moulding. Short fibres are specially used in this process. Nowadays, thermoset bulk moulded product occupied the market of thermoplastic injection moulded compounds such as motor parts, electrical component and housing appliances. (Samivel and Babu 2013). The surface smoothness of finish product is good but contains some void portion which reduces composite strength.