High-viscosity melt spinning spinneret plate

Abstract

The invention relates to a spinneret plate and particularly relates to a high-viscosity polyester melt spinning spinneret plate with the intrinsic viscosity ranging between 0.74dL / g-0.78dL / g. The overall shape of the spinneret plate is in a cylindrical shape, a plurality of spinneret orifices are arranged evenly on the spinneret plate in a circular mode, each of the spinneret orifice comprises a guide hole and a micro hole, the guide hole is connected with the micro hole, the shape of a cross section of the micro hole is a circular ring with three openings, the three openings are distributed on the circular ring evenly, the outer diameter d1of the circular ring ranges between 2.25mm and 2.45mm, the inner diameter d2 ranges between 1.5mm and 2.0mm, the width of the openings is 0.70-0.90 time of the width w of the circular ring, the length L of the micro hole ranges between 1.5mm and 2.0mm, the diameter d3 of the guide hole ranges between 4.0mm and 5.5mm, and the thickness Delta of the spinneret plate ranges between 35mm and 40mm. The spinneret plate has the advantages that coarse denier three-dimensional crimp polyester produced by the spinneret plate is low in spinning speed, good in spinnability, high in filling power, sufficient in stiffness and good in compression elasticity.

Description

technical field [0001] The invention relates to a spinneret, in particular to a spinneret for high-viscosity polyester melt spinning with an intrinsic viscosity of 0.74dL / g-0.78dL / g. Background technique [0002] At present, it has become a trend (trend) in the development of recycled polyester to produce differentiated fibers using liquid phase viscosification technology as raw materials, but the traditional spinneret spinning technology is based on the intrinsic viscosity of 0.625 dL / g~0.635 dL / g of polyester melt, and the application of liquid phase viscosification technology makes the intrinsic viscosity of polyester melt using recycled polyester melt as raw material can reach more than 0.680, compared with 0.635 dL of traditional spinning The most ideal intrinsic viscosity per g is higher than 0.045. In order to ensure the spinnability of the fiber, most enterprises adopt the method of increasing the spinning temperature to properly reduce the intrinsic viscosity of th...

AI Technical Summary

Problems solved by technology

In this way, the original spinneret has been applied, but the liquid phase viscosity increase has not only solved the uniformity of the melt and the removal of low molecular impurities in the melt, but the characteristics of the high-quality melt have not given full play to its due performance. out, resulting in single-function processed fiber products, increasing the intensity of market competition

[0003] Most of the spinnerets used for the existing three-dimensional crimped hollow polyester staple fiber are 3 "C" hollow spinnerets, and the intrinsic viscosity of the suitable spinning melt is about 0.630dL / g, and the produced three-dimensional crimped hollow polyester staple fiber has a The linear density is generally below 16.6dtex, and usually in order to meet the requirements of fiber crimp, the final hollowness of the fiber is between 25% and 33%. Although the fiber hollowness is too high, the fiber forms a good crimp, but the high hollowness The resulting fiber compression elasticity is greatly affected, the fiber is easily deformed after being stressed in the later use process, and the rigidity and elasticity of the fiber lose quickly

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