A kind of manufacturing method of high strength and high dimensional stability hmls polyester industrial yarn

Abstract

The invention belongs to the technical field of polyester industrial yarn manufacturing, and in particular relates to a manufacturing method of high-strength and high-dimensional-stability HMLS polyester industrial yarn. In the present invention, conventional polyester chips are subjected to solid-phase polycondensation to form high-viscosity polyester chips, and then the high-viscosity polyester chips are passed through a spinning screw extruder to obtain a high-viscosity polyester melt, which is distributed to each melt through a melt main pipe. Body branch pipe, then enters the spinning assembly through the metering pump and extrudes from the spinneret of the assembly, heated by the heating cylinder, enters the blowing cooling, and then passes through the spinning tunnel; oils the surface of the silk, stretches at room temperature in the first stage, and stretches in the second stage Heat stretching, heat setting at high temperature and constant speed, and finally relaxation and setting, coiling and forming, the total stretching ratio is 1.75-2.20; and winding at 6400-7000 m / min, the polyester industrial yarn produced is strong It is 8.2‑8.5cN / dtex, and the dimensional stability is less than 8.0%. It can be widely used in the fields of light truck and car radial tires, V-belt hard cords, transmission belts, high-grade geogrids, high-end automobile tires, conveyor belts, hose tapes, etc. .

Description

technical field [0001] The invention belongs to the technical field of polyester industrial yarn manufacturing, and in particular relates to a manufacturing method of HMLS polyester industrial yarn with high strength and high dimensional stability. Background technique [0002] Since the development of polyester industrial yarn cords in the early 1960s, after years of development and improvement, the production technology, equipment and applications of polyester industrial yarns have become more and more mature. Due to the good performance of polyester industrial yarn, lower production cost and better production environment, it has become the four major rubber skeleton materials together with nylon, steel wire and viscose strong yarn; polyester industrial yarn is mainly used as rubber skeleton material , the driving force for its development first comes from the demand for tire radial development. [0003] With the development of high-grade highways and luxury cars, the spe...

AI Technical Summary

Problems solved by technology

[0004] As we all know, under the same melt conditions, when producing high-strength HMLS polyester industrial yarn, compared with conventional HMLS polyester industrial yarn and HMLS polyester industrial yarn with high dimensional stability, the draft ratio needs to be larger, within a certain range As the post-drawing ratio increases, the strength of the original yarn increases, the dry heat shrinkage increases, the elongation at constant load decreases, and the dimensional stability of the original yarn decreases.

In the production of HMLS polyester industrial yarn with high dimensional stability, under the same melt conditions, the subsequent draft ratio is equivalent to that of conventional polyester industrial yarn, but smaller than that of high-strength polyester HMLS industrial yarn, and its original filament size The stability is much better than high tenacity HMLS polyester industrial yarn, but its strength is far less than high tenacity HMLS polyester industrial yarn

High-strength HMLS polyester industrial yarn needs to prepare high-viscosity polyester chips, high oil-free silk viscosity and high draw ratio to obtain high-strength HMLS polyester industrial yarn. In the actual production process, under this condition The production stability of industrial yarns is generally poor, which brings a load to production stability. At the same time, the dimensional stability of the high-strength HMLS polyester industrial yarns produced is worse than that of conventional polyester HMLS industrial yarns.

[0005] The manufacture of HMLS polyester industrial yarn with high dimensional stability needs to increase the spinning speed, thereby increasing the spinning tension, increasing the degree of orientation and crystallinity of the as-drawn yarn, and the increase in spinning speed will bring about the loss of the strength of the original yarn, and its production The strength of the high dimensional stability HMLS polyester industrial yarn obtained is slightly lower than that of conventional HMLS polyester industrial yarn

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