We, at Jeong Seong Machinery Co., had started as a Screw/Cylinder manufacturer for Injection Mouding Machines and Extruders in 1981 and have been maintaining good reputation as a leading manufacturer in this field. As all the plastic processors clearly realize, the screw and cylinder is absolutely the most important factor on the Injection Moulinding M/C and Extruder, and almost of the defects and inferior products are caused by inappropriate match with basic resin`s character and screw design. Our company has developed advanced screw designs which are proper to virous characteristics, especially for the precise processing equipments handling recently developed new plastic resins. We first discuss on our customer′s exact requirements and necessary design and then manufacture custorm-made screws to meet the particular application for customer`s better products and saving. Owing to continuous and steady R & D on virous extruders, we expanded our business category to manufacture extruding line, and many lines are running in domestic and foreign markets. We are so proud of our leading capability on both Scerw/Cylinder and reliable extrusion line business based on Sincerity and continuous R & D under good harmony with all company members.