A 90-degree bend with thread and plastic injection mold of design.
 The focus of the study is side parting core pulling. There was a thread on plastic pip. Uses a simple design patterns. So flap spotting is the better method. Because with avoid the complex the installation of the unscrewing. Witch gives a guiding significance for the products of thread. By selecting the right injection molding machine type.Using PROE determine the volume of the mold and parting line selection. It is to decide taking a mold with a four cavity. Which would rapidly increase the production capacity and production efficiency.successful design of this study will be for the future of plastic pipe classes provide a high reference value. and for the production of high economic efficiency.