A kind of production method of high-strength fine denier bright polyester staple fiber

Abstract

The invention discloses a production method of high-strength fine-denier lustrous polyester fiber staple fibers. The method is that the esterification reaction is performed for terephthalic acid and ethylene glycol polyester to obtain a terephthalate melt; after being processed by pre-polycondensation, final polycondensation and spinning intersection, the terephthalate melt is fed into a melt pipeline of a spinning device under a certain pressure; the melt passes through a booster pump and a filter to enter a spinning box body and then is extruded from a fine hole in a spinning plate, and the extruded melt is cooled through circular blowing air of a circular blowing barrel and then is gradually slimed and solidified and formed under the coiling and stretching tension force effect; strands from a spinning machine passes through a coiling machine and then is fed into a storing barrel for back draft. The method is specifically characterized in that 1200 to 3000ppm nucleating agents, namely, nano barium sulfate are added to the melt; the viscosity of the spinning melt is 0.7 to 1.0dl / g; a 10 to 30mm slow cooling circular blowing device is additionally arranged between the spinning plate and a circular blowing barrel; the back draft rate is 3.5 to 3.8 times. The polyester fiber staple fibers special for sewing threads has the fineness of 0.7 to 0.9dtex, and the breaking strength is more than 6.40cn / dtex.

Description

technical field [0001] The invention relates to the technical field of polyester staple fiber production and processing, in particular to a production method of high-strength fine denier glossy polyester staple fiber. Background technique [0002] In recent years, domestic bright polyester staple fiber has been developed due to its rapid growth in demand. The total demand has increased from 200,000 tons in 2004 to 500,000 tons in 2010, of which 70% are used for processing garment sewing threads , 30% is used to process sewing thread for bags, embroidery thread, woven and knitted fabrics, etc. According to data, China's polyester glossy sewing thread industry has a comparative advantage in the world. At present, the specification of bright polyester staple fiber is 1.33dtex, and the fiber strength index is ≥6.20cN / dtex. According to the survey, there are 9 items that users pay attention to the raw material fiber indicators and performance, among which the attention to fiber s...

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Problems solved by technology

[0004] After retrieving relevant domestic and foreign literature, there is no report that the strength can reach more than 6.40cN / dtex, and the fineness is 0.7-0.9dtex.

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