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Till early 1990’s fiber reinforced polymer composites were based mainly on thermosetting polymers. In recent years, a rapid growth has occurred in fiber reinforced thermoplastics (FRTP) composites because of their higher toughness, impact resistance, damage tolerance and recyclability. High melt viscosity of thermoplastics presents many challenges to its processing. Newer technological developments have made thermoplastics composites viable. In the present work, glass-polypropylene, glass-polystyrene and jute-polypropylene composite laminates are fabricated by film stacking process. Film stacking is a technique for plying thermoplastics film/ sheet and fibrous reinforcement using heat and pressure. Selection of processing parameters (pressure, temperature and dwell time) for achieving optimum properties is required. Pressures applied were 4.0, 6.0, 7.5, 10.0, 15.0, 20.0 MPa and temperatures used were 200 and 210 deg C for polypropylene matrix composites; 255 and 260 deg C for polystyrene matrix composite laminates. FRTP laminates produced were characterized for various mechanical properties. Further work to arrive at optimum process parameters for different FRTP materials is in progress. In recent years, a rapid growth has occurred in fiber reinforced thermoplastics (FRTP) composites. The emergence of thermoplastics composites for a wide range of applications is driven by technological advantages such as higher toughness, impact resistance, damage tolerance and recyclability. They also offer faster processing cycles and high potential for automation because of absence of curing reaction. The most difficult problem in manufacturing thermoplastics composites is to achieve complete and homogeneous impregnation of a large number of slender and sensitive fiber networks with highly viscous and gelatinous thermoplastics melt [1]. To overcome the difficulties involved in the production of composites, both pre-impregnated and in-situ impregnated concepts have been developed. The degree of impregnation is the most critical point in production and has great impact on the resulting mechanical properties of the composite material [2]. Processing of glass mat thermoplastics by hot compression molding represents a complex physical process with nonisothermal and non-Newtonian conditions [3]. Processing models were generated using regression techniques describing the effect of processing variables on void content and laminate mechanical properties. Mitschang etal [4] have investigated the processing technologies and impregnation/consolidation behavior occurring inthelaminationprocess. In the present work, woven fabric reinforcements (glass and jute) with polypropylene and polystyrene matrices (in film/sheet form) are used. The effect of processing temperature and pressure on mechanical properties of glass/polypropylene, glass/polystyrene and jute/polypropylene composites fabricated by film stacking followed by compression molding is being studied. Experimental Work: The composite laminates were fabricated by the process of film stacking and hot pressing in a hydraulic compression molding press. Details of materials used for fabrication of FRTP composite laminates are given in Table 1.

Some Studies on Fiber Reinforced Thermoplastics Laminates Fabricated by Film Stacking Method