Effect of injection parameters of engineering plastics on flow lenght

Plastics resistant as steel were obtained by putting additives to main monomer of plastics or mixing them with different monomers at certain ratios and also flexible plastic, soft as naturel sponge were obtained. These plastics are defined as engineering plastics and their uf usage fields increase day by bay. It is important to know the flow lenght of engineering plastics at mould design. Runner, distributor canal with and injection parameters should be known well for filling mould effectively. For this purpose, mould having different canal wideness ( determined according to ASTM D 3123 standards ) were made and the flow lenght of widely used Acrylonitrile Butadiene Styrene (ABS), Polycarbonate (PC), Polyamide 6 (PA6), Polyamide 6.6 (PA6.6), Polioksimetilen (POM) engineering plastics were studied. Experiments were carried out by fixing two values from the heat, pressure and screw speed of injection parameters and changing one of them and making injection impression in plaques having different spiral canal wideness. It was determined that flow lenght of PA6.6, PA6, POM, PC and ABS engineering plastics were 941, 900, 811, 665, 627 respectively. It was determined that flow lenght increases with the increasing values of injection parameters. Key Words : Mouldability, Spiral flow, Melt flow lenght.