A preparing method of a polyethylene fine-denier moisture-conducting fiber

A preparing method of a polyethylene fine-denier moisture-conducting fiber is disclosed. The polyethylene fine-denier moisture-conductive fiber the fineness of which ranges from 22 dtex to 1776 dtex is obtained by swelling ultra-high-molecular-weight polyethylene used for fiber and having a molecular weight of 4-8 million in decalin to obtain a suspension, dissolving and shearing through a twin-screw extruder to allow polyethylene macromolecular chains to be fully untwisted to form a uniform spinning solution, spinning through a spinneret plat, removing the decalin in a silk bundle in a hot-wind circulation system, pre-stretching, performing one or more thermal stretch steps and performing one or more loosing steps. The hot-wind circulation system is a sealed heating chamber having nitrogen circulated therein. The polyethylene fine-denier moisture-conductive fiber is lighter, thinner and softer than conventional polyethylene fibers, maintains high-strength and high-modulus characters. The cross section of the fiber has an oval shape, an egg shape, a dog bone shape, a bean shape or other special shapes. The fiber is provided with micro grooves and slots at the axial direction. Moisture-conducting performance of the fiber is obviously improved than that of wet-process fibers. The fiber is obviously improved in wearability, and fabric of the fiber has moisture conducting and rapidly drying and refreshing properties.