RU2107760C1 - Method of production of twist thread - Google Patents

Abstract

FIELD: methods of production of twist thread on ring-spinning machine. SUBSTANCE: the offered method for production of twist thread on ring-spinning machine provides for passing of two separate flows of semifinished product through drawing mechanism and upon passing, formed components are joined together, and imparted twisting to twist thread is extended to the components to lend them twist of same direction and value. Supplied to each separated flow of semifinished product passed through drawing mechanism are core threads, and upon leaving the drawing mechanism, prior to joining together, reinforced components are formed by web winding on core threads. Web fibers prior to their winding on threads are treated with compounds to reduce friction and to increase conductivity. Core threads are preliminarily twisted with twist opposite in direction to that imparted to twist thread and with value less than that of twist thread by a factor of 1.3-1.5. EFFECT: higher efficiency. 2 cl, 3 tbl

Description

 The invention relates to the textile industry, in particular to methods for producing twisted yarn, which can be used, for example, in the clothing and footwear industries.

 There is a method of producing a composite sewing thread on a ring spinning machine [1], according to which the core complex thread and roving are fed to a fume hood, and the complex framing is fed into a fume hood with an offset relative to the spinning plane.

 The disadvantage of this method [1] is to obtain a nonequilibrium thread, which is explained by the use of a twisted multifilament thread as a core, glossy threads - due to the surface location of the complex binding thread, moreover, the strength of the thread is reduced due to the increased non-simultaneous rupture of the core and binding thread .

 There is a method of producing a component thread on a spinning and spinning machine [2], according to which the component of the thread coming from the package installed on the spindle is carried out through the spindle in the form of two or more additions, and the component of the thread coming from the exhaust device is straightened simultaneously of two slippers.

 A disadvantage of the known method [2] is the breakage of the slippers due to their small twist, equal in magnitude to the twist of the component twisted yarn, the difficulty of refueling two slippers at once, the gloss of the filament between the turns of the spun component, if the component installed on the spindle is constructed with complex yarns.

 A known method of producing a twisted thread on a ring spinning machine [3] (a method of combining spinning, trimming and torsion processes, in which slivers of fibers of finite length are used as components) by separately passing two or more semi-finished product streams through an exhaust device and connecting them together at the exit from it, and the twist imparted by the twisted thread extends to the components, giving them a twist of the same direction and magnitude.

 The disadvantage of this method [3] is the production of defective threads "thin pass" due to the breakage of one of the slippers.

 The technical result of the proposed method is to eliminate these drawbacks, namely, reducing the breakage of components upon receipt of a twisted thread by supplying each of the two separate streams of the semi-finished product, passed through an exhaust device, rod complex yarns while expanding the technological capabilities of using natural fibers of small length in the braid, staple chemical fibers and their mixtures due to the fact that the fibers before applying them to the threads are treated with compositions to reduce the increase and electrical conductivity, which contributes to better cleaning of the fibers and stabilization of the spinning process by reducing the electrification of the fibers, and as a result, a decrease in the coefficient of variation in the breaking load of twisted yarns is 1.5 - 5.5 times and smooth, matte, dense and soft sewing threads with good piercing properties, especially multilayer bags - up to 10 layers of starched coarse calico, which indicates the strength of braiding on core complex threads.

 The problem is solved in that in a method for producing a twisted thread on a ring spinning machine, according to which two separate streams of the semifinished product are passed through an exhaust device and, upon exit from it, the formed components are connected together, and the twist imparted by the twisted thread extends to the components, giving them a twist in the same direction and quantities, moreover, in each of the two separate streams of the semifinished product passed through the exhaust device, rod complex filaments are fed, and upon leaving it, before forming cosiness reinforced components, wrapping the complex yarns with a sliver, the fibers of which are applied to the yarns to be treated with compositions to reduce friction and increase electrical conductivity, while the complex yarns are preliminarily twisted in the opposite direction to twisted twisted yarns and are 1.3-1.5 times less than twisting twisted yarn.

 The authors are not known in the prior art methods for producing a twisted thread, which together would have features similar to those that differ from the prototype of the proposed method.

 The implementation of the proposed method is confirmed by examples of the production of twisted yarns (see Table 1), which are sewing threads, in the conditions of the Sovetskaya Zvezda spin-and-thinned combine, where polyester core yarns of 2 and 3 types were used ( instead of the 1st) and lavsan staple fiber.

 Cotton rovings were made using a combed spinning system, dacron rovings were made using carded rovings, and cotton and dacron ribbons were mixed using tape machines to produce cotton lavsan rovings. The fiber was emulsified during pneumatic transport and oiled on a carding machine using the “inside the tape” method [4]. Both for the preparation of the composition of the emulsion, and for the composition of the sizing used a mixture of surface-active substances (surfactants) known sizing [5]. The percentage of application of the water emulsion was 2-4, and the sizing was 0.25-0.35 by weight of the fiber.

 The roving for producing shoe threads 200 LHLSH of Example 7 was produced using a carded spinning system from cotton-lavsan waste instead of the 2nd comb, which was re-emulsified and oiled in the same way as in Examples 1-6.

 For examples 1 to 6, the core complex yarns were twisted on a TKI.

 The twisted yarns were produced on a P-76-5M6 ring spinning machine, which were severe sewing threads for Examples 1-6, so they were rewound on soft skein machines, dyed and wound into finished packages.

 In torsion example 7, a thread containing non-twisted core yarns on a ring spinning machine received a twist of the left direction and was a single-strand strand, which was then twisted into 2 folds, twisted with a twist of the right direction and received two-twisted severe shoe threads.

 The friction coefficient μ of cotton fibers for metal was determined on a TKI device with a torsion friction force meter manufactured by Metrimpex (Hungary). The correlation coefficient r was determined between ν and weediness of the carding from the carding machines — after emulsification and from combing machines — after oiling.

The electrical resistance R _v and the specific volume resistivity ρ _{v of the} fibers in the tape were measured using the capacitive method of measuring high electrical resistances (or the method of discharging a known capacitance through the required resistance), the electrification charge q _v and its sign were determined on a thermometer when winding the roving. The results of these measurements are given in table. 2, from which it can be seen that the combined double treatment with compositions with the same surfactant mixture reduces the coefficient of friction of cotton fibers on the teeth of the headsets of the combing and combing drums (Unikomb, Japan) of the combing machine and helps to remove weed impurities, since the correlation between μ and the contamination of both the carding and combing webs is straight, positive. Electrical measurements indicate an increase in the electrical conductivity of treated cotton fibers compared to untreated.

 Indicators of physical and mechanical properties and appearance of twisted yarns indicated in the table. 1 examples are given in table. 3, from which it can be seen that, in terms of linear density, breaking load, elongation and unevenness, the twisted yarns of Examples 1-6 correspond to the requirements of GOST 6309-93, and the coefficient of variation in their breaking load (especially for yarns with a staple dacron fiber braid, in which requirements on this indicator are reduced due to their increased electrification in spinning) 1.37-1.55 times for LH type threads and 3.1-5.5 times less for LH and LHLS threads, which is due to increased electrical conductivity fibers when static e charges are formed Electricity drains from the fibers faster and does not interfere with the spinning process.

 Given that the shoe thread 200 LH is used, in particular, for sewing container bags, and using the inventive method for producing twisted threads of example 7, you can create a waste-free technology spinning production.

 Thus, the proposed technical solution to feed the core complex yarns into each of two separate semifinished product streams passed through an exhaust device, upon exiting from it, form reinforced components before connecting the streams, whose braid fibers should be emulsified and oiled in the manufacture of rovings with the same interpenetrating structures surface-active substances, and for single-strand filaments, complex rod yarns must first be twisted in the opposite direction to 1.3–1.5 times smaller than a twist of a twisted yarn, the weft can reduce component breakage in the manufacture of twisted yarns and at the same time expand the technological capabilities of using small length fibers, chemical staple fibers and their mixtures in the braid, and create a waste-free technology spinning production due to better cleaning by reducing the friction of the fibers on the teeth of the headsets and increasing the electrical conductivity, which reduces the electrification of the fibers and as a result get smooth with good and sewing properties of the thread, especially when sewing multilayer bags.

Sources of information
1. Patent EPO (EP) N 0279756, publ. 88.08.24, N 34.

 2. A.S. USSR N 234902, publ. 1/17/73.

 3. A.S. USSR N 8006, 01/07/49 secret, prior. 03.20.47.

 4. A.S. USSR N 1390263, publ. B.I. N 5, 1988.

 5. A.S. USSR N 1086042, publ. BI N 14, 1984.1

Claims (2)

 1. A method of producing a twisted thread on a ring spinning machine, according to which two separate semi-finished product streams are passed through an exhaust device and, upon exiting from it, the formed components are joined together, and the twist imparted by the twisted thread extends to the components, giving them a twist of the same direction and magnitude, characterized in that in each of the two separate flows of the semifinished product passed through an exhaust device, rod complex threads are fed, and upon exiting from it, reinforced components are formed before connection enty, wrapping the core of the complex yarn with a sliver, the fibers of which before applying them to the yarn are treated with compounds to reduce friction and increase electrical conductivity.  2. The method according to p. 1, characterized in that the complex core yarns are preliminarily twisted in the opposite direction to twist the twisted yarn 1.3-1.5 times smaller than the twist of the twisted yarn.

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