These voids inevitably generate the weak zones where the load bearing capacity tends to gradually diminish leading to the lower strength levels. Furthermore, the void size is comparatively small for treated fibre biocomposites as opposed to untreated fibre counterparts. At the higher fibre content of 20 wt%, saturated fibre bundles were mainly observed in the morphology of untreated fibre biocomposites, which become stress-concentration initiators prone to the crack failure, Fig. 2(e). By contrast, a majority of treated fibres within biocomposites are fractured along PLA matrix planes, and very strong interfacial bonding is presented with little sign of fibre pull-out, Fig. 2(f). When the maximum 30 wt% coir fibres were used in this study, considerably large fibre bundles are demonstrated in Fig. 2(g and h) and separated from PLA matrices to form the non-uniform and poor fibre distribution. The actual fabrication of relevant biocomposite laminates appears to be very difficult for the good control of bulk material using compression moulding technique due to the excessive fibre layout.