Fiber attrition is a major problem while dealing with natural fiber reinforced com­posites during the melt mixing process.28 The strength of the natural fiber reinforced composites depends on the amount of applied load transmitted to the fibers. The extent of load transmitted depends upon the length of the fiber and the fiber matrix interfacial bonding. The load sharing capacity of the fiber in short fiber reinforced composites (as in case of injection molded composites) depends upon the critical fiber length (CFL). If the fiber length is less than the CFL, debonding of matrix and fiber takes place resulting in failure at low load. If the fiber length is more than the CFL, a failure due to breaking of fibers takes place indicating high composite strength. In case of injection molding process, a significant amount of fiber attrition is found in the molded part due to high shear rates during plasticizing, injection and passage through narrow gates and openings of the mold.26 Fiber attrition also takes place during precompounding process employing a melt mixer, kneader or twin screw extruder. Reduction of the fiber length below the CFL would lead to degra­dation of the composite properties as the short fibers would not be able to bear the load for which the composites are designed. Hence, the determination of the CFL of fibers is important prior to injection molding of fiber-reinforced composites. Al­though, increasing the fiber content would lead to better mechanical properties but the injection molding process limits the amount of fibers that can be injected due to increased viscosity of the mixture and narrow gate and sprue of the mold. To over­come this problem of fiber attrition during processing of NFCs by injection mold­ing, the process parameters and mold dimensions should be adjusted according to the fiber load and viscosity of the melt. The process parameters should be adjusted to cause minimum shear rate during processing of NFCs. Also the gate and sprue dimensions should be increased in order to accommodate the fibers and reduce the shear rate. Better precompounding techniques should be developed to reduce the fiber attrition during precompounding of fiber and polymer. In a study regarding incorporation of a counter rotating extruder for compounding of biopolymer-wood composites, it was reported that a higher aspect ratio of the fibers was achieved due to the use of counter rotating extruder which acts more likely as a refiner and the fiber breakage, compared to other mixing techniques was reduced.6