Production method of fine-denier porous POY black yarn

Abstract

The invention discloses a production method of a fine-denier porous POY black yarn. The method comprises the following steps of: drying semi-dull slices, drying black masterbatch, adding the slices and the black masterbatch material into a screw extruder, fusing the added materials in the screw extruder, respectively processing the fused materials in a metering pump and a spinning beam, spinning on a pack, cooling the materials by lateral blowing, applying oil on strands, processing the strands in draw-off godets GR1 and GR2, winding and shaping, and inspecting products. The method is characterized in that the step of drying the black masterbatch comprises the following sub-steps of: based on a continuous drying mode, firstly, adding the black masterbatch into a crystallization and drying tank, introducing heated dry air from the lower part of the crystallization and drying tank, and blowing out the heated dry air from the top of the crystallization and drying tank so as to dry the black masterbatch, wherein the drying time is 2 hours, the dried black masterbatch falls into an intermediate material storage bin for storage under the crystallization and drying tank, and the black masterbatch is further injected by a masterbatch injector under the intermediate material storage bin. The production method of the fine-denier porous POY black yarn has high masterbatch spinnability and better cooling effect, and can improve the oil application uniformity of spinning cakes and the productivity.

Description

technical field [0001] The invention relates to a production method of fine denier porous POY black silk. Background technique [0002] Polyester fine denier porous POY black silk is a special modified fiber. This variety is made by adding color masterbatch on the basis of the original POY white silk, and processed by special technology, which can save the dyeing process. At present, the output of the chemical fiber market has risen sharply, resulting in an increasingly prominent situation of oversupply of polyester products. In addition, the country's requirements for environmental protection are getting higher and higher, and the competition for chemical fiber products in the domestic sales market is becoming more and more fierce. To achieve further development under the current situation, it is necessary to develop differentiated and functional fibers. [0003] The existing masterbatch is dried in the raw material hopper type. Because the hopper dryer uses a blower to ex...

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Problems solved by technology

[0003] The existing masterbatch is dried in the raw material hopper type. Because the hopper dryer uses a blower to expand the heat to the middle of the masterbatch, the wind force is small, the heat is insufficient, and the drying effect is poor, and the ideal masterbatch moisture content (below 200ppm) cannot be achieved. Poor spinnability of masterbatch

[0004] In addition, with the further development of the chemical fiber industry, the technical and quality requirements of chemical fiber products are getting higher and higher. Especially at present, most melt direct spinning enterprises have adopted the ring blowing cooling method to produce fine or ultrafine porous filaments. It has been unanimously recognized by customers, and the market demand is increasing, but at present, most of the traditional chip spinning enterprises adopt the side air cooling method, which cannot produce porous fine or ultra-fine denier fibers. The main reason is that fine denier or ultra-fine denier fibers The denier product has low monofilament fineness and a large number of holes, and the cooling air cannot penetrate the tow smoothly when the tow is cooling, resulting in uneven cooling of the tow. The tow on one side of the blowing wire window cannot be cooled sufficiently; in addition, the wind on the upper part of the side blowing wire window is easily distorted (downwardly) by the tow moving downwards, thus greatly reducing the cooling effect of this part of the side blowing , and eventually formed wool or doubling, the products produced could not be woven on the machine, and the product quality could not be recognized by customers. Therefore, the fine-denier porous yarn can only be cooled by ring blowing, and the fine-denier porous yarn can be produced by side blowing has always been a bottleneck in the industry

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