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Dalian Synthetic Fiber Research & Design Institute Co., Ltd. has kept researching and developing efficient multi-end yarn spinning from 2000, which introduced technology of 16-ends spinning, 20-ends spinning, 24-ends spinning, and 32-ends spinning in succession. That increases the output and reduces energy consumption greatly. In the production of micro fiber, there are significant technological advantages of high efficiency and low consumption. The technology is efficient, mainly applied to spinning long low denier yarn under 75D. 1 filament in l spinneret technology is used for the spinning machine. The spinning technology of 20 ends and 24 ends were developed in succession.