LEAFLET Waste paper recycle by extrusion technology The Japan Steel Works, Ltd. Plastics Machinery Business Division Mixture of paper and polymer has low fluidity so the screw tip to the die plate is designed to make smooth polymer flow. Hot cutting unit prevents moisture adhesion after pelletize. Background Mixing and extrusion technology offers another opportunity to recycle wast papers to make different form of products. By mixing with plastic material, waste papers can be recycled as containers, wrapping materials or fuel instead of only recycled paper. The mixed product of papers and plastics are also efficient at disposal stage since it lowers side effects to the environment. Challenges of waste paper extrusion are properties such as low bulk density, variety form and fiber characteristic. These characteristics make it difficult to stabilize throughput rate and degree of dispersion. In addition, the extrusion temperature has to be kept low as paper is easy to burn out. cutter case cutter blades cutter unit cutter blades Figure ２. Cutting unit Pelletize result Mixing Technology ■ Stabilize throughput rate Enhanced feed rate by specialized hopper Applied high shear rate without lowering melt index Lowered screw rpm with high torque gear reducer and deep groove screw to mix at low temperature and high viscosity condition Photo １. PP ＋ crushed paper （50wt％） Multiple vacuum vents to remove moistures in paper Multiple vacuum vents Mixing at high viscosity condition with high shear rate Figure １. Mixing configuration for paper and polymer Japan Steel Works, Ltd. Tokyo Head Office Gate City Osaki West Tower 1-11-1, Osaki, Shinagawa-ku, Tokyo 141-0032, Japan Photo ２. PP ＋ compressed paper （51wt％） ＋ TiO2 Europe (Germany) China (Shanghai)