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Nanofluid colled Injection Moulded Products

S.M. Mohamed Nainar, H.A. Mohamed, Md.A.M. Nainar
Universiti Tenaga Nasional, MY

Keywords: nanofluid


Products made from plastics contribute strongly to the global economy in terms of performance, reliability, cost-effectiveness and high added value. Among the many reasons why plastics are widely used, two stand out. First, plastics can be operated in a variety of environments and they have useful ranges of deformability and durability which can be exploited by careful design. Second, plastics can often be readily, rapidly and at an acceptable (optimal) cost be transformed into usable products having complicated shapes and reproducible dimensions [1]. A modern injection-molding machine operation uses a reciprocating screw to melt a measured volume of feed introduced through the hopper. After a sufficient time has elapsed to form a homogeneous melt, the rotation of the screw ceases, and melt is rammed into a mould under high pressure by a hydraulically driven thrust of the screw. The amount of resin that can be moulded may vary with a particular machine from a few grams to few kilograms, with a clamping forces up to 5000 tons [2]. The plastic injection molding process is a cyclic process. There are four significant stages in the process. These stages are filling, packing, cooling and ejection. The plastic injection molding process begins with feeding the resin and the appropriate additives from the hopper to the heating/injection system of the injection plastic injection molding machine [3]. It is very important to control the time for forming polymer articles in injection moulding because the cooling time directly affects the productivity of the process and the quality of the product [5]. Modern technology such as nanotechnology makes it possible to produce ultra fine metallic or non-metallic particles of nanometer dimensions, which makes a revolution in heat transfer enhancement methods. Considering very small particle size and their small volume fraction, problems such as clogging and pressure drop increasing become insignificant for nanofluids. Also the relative large surface area of nanoparticles increases the stability and reduces the sedimentation of nanoparticles. A more dramatic improvement in heat transfer efficiency is expected as a result of decreasing the particle size in a suspension because heat transfer takes place at the surface of the particles[6]. This method of cooling design in injection moulding processes may be expected to achieve better efficiency and better quality of the products manufactured.
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