SU870517A1 - Method of producing complex rayon yarn - Google Patents

Description

(54) METHOD FOR OBTAINING VISCOSE COMPLEX THREADS

This invention relates to the production of artificial fibers, in particular to the methods of obtaining viscose fibers - complex:; strands. We know the simultaneous method of shaping, which is the main method of producing all types of viscose fibers — a stylish and cord thread, a staple fiber f 11.. Viscose prepared in the chemical workshop is fed to the spinning machine through the viscose lines through the spinning pumps and filter boots from the spinners. The spinning screws are applied to the viscose of the formative agents mounted on the end of the screws and immersed in the precipitation vannus. The streams of viscose flowing out of the orifice former are coagulated under the influence of the seed bath reagents and then washed to the cellulose hydrate. Each of the viscose streams forms an elementary filament, which is part of the bundle of a multifilament yarn. The disadvantage of this method is VLG. That the viscose, the passage through the screw, immersed in the precipitation bath, is heated. The standard, generally accepted parameters of the precipitation bath, for example, in the molding of viscose textile fabric, 49 i 1 ° C, and the temperature of the viscose entering the molding, 16 - 1 € gS. The amount of viscose heating in a screw depends on which assortment the thread forms. The thicker the kokosheksna thread, the greater the consumption of viscose, the shorter the time it stays in the worm, as a result of which the viscose has less time to heat up. Depending on the assortment being obtained, the average temperature of the viscose at the exit from the thread dispenser is 34-45) C. The lower the average temperature of the viscose flowing from the thread former, the greater the temperature difference between the precipitating medium and viscose. Heating of viscose in the screw is HC-uniform: closer to the walls of the screw, its temperature is higher, closer to the temperature of the bath, in the center of it is lower, Sledsivatelio, streams of viscose (there are as many as holes in the filament former) j having different temperatures at the moment of contact with the precipitation bath. Taking into account the fact that with increasing temperature viscosity of viscose decreases, takes place during the formation of separate streams of viscose and then elementary :; yarns unevenness of one of the important parameters of viscose viscosity. One such developer of the uneven viscosity of viscose is the formation of streams and then filaments of various thickness with different physicomechanical characteristics. The part of the fibers, which has a lower stitchiness, is most susceptible to breakage and is the cause of lint formation and a decrease in the quality of the yarn as a whole. Biscale.,% 8.30-8.40 NaOH,% 6.25-6.35 Viscosity, s37-45 Maturity, ml 1 n. solution of MN, Cf17, 8-18 The temperature of the viscose flowing from the thread former on the worms with the kneader and the usual worms remains the same and corresponds to 34 +; 0 ,. To clarify the effect of the proposed method on the properties of filaments, batches of viscose complex yarns have been developed and then certain characteristics obtained by a known method 21.0 are studied.

Thread received by

invention25,6

Table 1

3.0

3.0

No No The purpose of the invention is to obtain iti with increased rupture elongation. The goal is achieved by the method of forming viscose complex yarns, including the preparation of viscose, heating it in the worm e and forks for yarn, viscose in the shaken before molding is further mixed, for example. Getting viscose complex yarn linear density of 16.6 Tex on. 4O of the filaments are carried out as follows. Viscose is fed to the molding according to the scheme: pump-filter-wake-up worm with a mixer built into it - thread former. In parallel, on the same machine, the formation of thread i is carried out according to the following scheme: pump-f11-bump-worm to-forger. The parameters of viscose and precipitation baths are as follows: Precipitant bath П25О4, g / l136-138 Zvv90, g / l12-13 Specific weight 1,278-1,279 1 bath 49 + pins: the tensile elongation and load of the filaments were determined according to the standard method on the FOF device 1e (GDR) Complex thread, according to this and the known methods, is sorted according to GOST 8871-74. Test data yarn summarized in table. 1. 5870 Example 2. The molding of a viscose complex yarn with a linear density of 6.7 tex per 18 fipaments is carried out as described in example 1. In contrast to example 1, the temperature of the viscose flowing from the thread former on worms

How viano from tabl. 1 and 2, the additional mixing of viscose in a screw before molding allows an increase in the rate of rupture elongation of filaments in a multifilament yarn, which in turn leads to an improvement in its quality.

The use of the proposed method in the production of artificial fibers poses: 1 ols one of the main defects - the hairiness of a viscose multifilament yarn by 1.5-2,%, affecting the quality (grade) of the finished product.

When processing yarn with reduced hairiness, labor productivity in enterprises processing these yarns increases.

Claims (2)

1. Rogovin 3. A. Fundamentals of chemistry and chemical fiber technology, M., Himn 1.974, t. 1, p. ZOZ. 17 with a mixer in the ordinary remains the same and corresponds to 45 + 0 ,. Subsequent tests of the e-k and the initial yarns and the sorting of the complex ICPs are carried out analogously to Example 1. The data are given in Table. 2. Table 2