RU2620046C1 - Combination yarn - Google Patents

Abstract

FIELD: textile, paper.

SUBSTANCE: invention relates to heat-resistant flame-proof heterogeneous high impact combination yarns for manufacturing protective clothes of fire-fighters, welders, metallurgists, oil workers and military uniforms. Combination yarn made of a core filament para-aramid folded yarn twisted with two polyoxadiazole folded yarns in opposite directions, first in the anticlockwise and then clockwise, with the core yarn tension of 55-180 cN, at a ratio of core yarn twists against the folded yarn of (0.5-0.6):(2.9-3.9), at the weight ratio, wt %: (17-34):(66-83), where the number of twists is equal to 220-390 twist/m and the core yarn twisted surface is at least 65%.

EFFECT: lowering of yarn stiffness when bending and twisting, while high physical, mechanical and performance properties are maintained and the yarns range of linear density of 65-95 tex is expanded.

3 cl, 2 dwg

Description

The invention relates to the textile industry, in particular to heat-resistant high-strength inhomogeneous combined yarns, and can be used for the manufacture of woven products operated in life-threatening conditions, in particular protective clothing of firefighters, welders, metallurgists, oil industry workers, military uniforms, etc. . This allows you to significantly expand the assortment group of heat-resistant combined threads, providing universal properties of protective clothing.

Known from the prior art is a textile yarn for the production of flame retardant products containing thermally oxidized polyacrylonitrile fibers or thermally oxidized polyacrylonitrile fibers and animal or vegetable fibers, or fire-resistant viscose, or aramid, or para-aramid, or polyoxadiazole, or their homogeneous mixtures, and thermo-oxidized poly the fibers make up at least 25% of the weight of the yarn, have a crimp of 3-7 twists per centimeter of length, a linear density of 0.11-0.5 tex, specific gravity 1.3-1.43 g / cm ³ and a length of 40-90 mm. The specified yarn contains a core in the form of a para-aramid or polyoxadiazole continuous thread (Patent RU 2286410, D02G 3/04, 10.27.2006).

However, the production of such a thread is complicated due to the number of transitions upon receipt, which, in turn, negatively affects the productivity and cost of the finished thread.

A composite thread is known consisting of 32 tex × 2 linear density yarn (Terlon) in combination with a complex thread with a step of 8: 1-2 (Terlon) or with a combined thread with a step of 30: 2 obtained from heat-resistant polyparaphenylene terephthalamide fibers (Patent RU 2103427 , D03D 15/00, 01/27/1998).

The disadvantages of this technical solution are an unsatisfactory indicator of disequilibrium, low resistance to tensile and abrasive loads, difficult coloring.

A composite yarn is known, the first component of which is a multifilament yarn or yarn of fiber based on aromatic copolyamide twisted with a second component of yarn consisting of fiber based on oxadiazole, single, double or triple fold, and the thread or yarn of the first component has a linear density in the range from 10 to 200 tex, and the yarn of the second component from 13 to 200 tex with the following ratio of the components of the thread wt.%: thread or yarn from fiber based on aromatic copolyamide 80-45, yarn of fiber-based oxadiazole 20-55 (Patent RU 2211263, D03D 15/12, 27.08.2003).

The disadvantages of this thread are an unsatisfactory indicator of disequilibrium, low resistance to abrasion, insufficiently high strength of the thread, uneven dyeing at low values of twist.

A composite yarn is known, the first component of which is an aramid yarn twisted with a second component of yarn consisting of oxadiazole-based fiber, the combined yarn is a bicomponent reinforced yarn in which a linear density aramid yarn 6.3- 200 tex, and the second component in the form of a braid of yarn based on oxadiazole with a linear density of 10-200 tex in the following ratio of the components of the thread, wt.%: Thread based on aromatic copolyami yes 10-50; fiber yarn based on oxadiazole 90-50 (Patent RU 2408748, D03D 15/12, 01/10/2011).

The disadvantage of this combined thread is a slight corkscrew effect in the structure of the thread, which complicates the process of further processing of the thread on a loom.

Closest to the claimed yarn is a combined yarn consisting of a complex para-aramid yarn and an yarn made of oxadiazole fibers wrapping it with a core component of 10-25 cN (EV Blagushina, VA Rodionov. Structure optimization and technologies for producing combined wrapped threads // University News. Technology of the textile industry, No. 5, 2013).

The disadvantage of this thread is that when the specified tension does not provide a linear arrangement of the core thread and, as a result, there is no symmetrical arrangement of the components relative to the axis, and the quality of the combined thread is not always satisfactory.

The task of the invention is the creation of a new combined yarn with a set of properties necessary in the conditions of its use.

The technical result of this invention is to obtain a combined yarn with a reduced rate of bending stiffness and torsional stiffness while maintaining high physical, mechanical and operational properties and expanding the range of threads of linear density 65-95 tex.

This technical result is achieved due to the development of a combined thread made of a complex core para-aramid twisted yarn twisted with two polyoxadiazole twisted yarns in opposite directions with an equal number of wraps, first counterclockwise, then clockwise, when the core thread is tensioned equal to 55-180 SN, while the ratio of the twist values of the core thread and the wrapping yarn is (0.5-0.6) :( 2.9-3.9), and their mass ratio is in the range, wt.%: s 17-34, 66-83 obkrutochnaya yarn; the number of turns is 220-390 obkr / m, and the wrapped surface of the core thread is at least 65% of the total area.

The structure of the inventive combination thread is shown in FIG. 1 and 2,

Where:

1 - core para-aramid thread;

2 - the first wrapping yarn (inner layer of the winding);

3 - second wrapping yarn (outer layer of the winding).

A heat-resistant high-strength composite thread has been developed, in which twisted complex para-aramid yarns and polyoxadiazole yarns are used as components as the most promising and economical combination for woven products based on them, operating in life-threatening conditions. The resulting plain weave fabric has a high strength: 1870.4 and 1311.1 N on the warp and weft, respectively, and a high resistance to abrasion along the plane: within 21252-27518 cycles.

One of the most important characteristics of the combined yarns used in fabrics for the manufacture of protective clothing is bending stiffness and torsional stiffness. A decrease in these indicators leads to an improvement in the processing ability of the combined yarn into fabric. These properties have a significant impact on the production of woven fabrics and the further operation of products from them. The specified indicator of the tension of the core thread determines the structure of the wrapped threads with a rectilinear arrangement of the core thread.

The core thread is made of a complex para-aramid yarn of linear density from 14 to 30 tex, which consists of at least 100 filaments with a decomposition temperature of more than 500 ° C, with a tensile elongation of at least 2.5% and a strength of at least 270 cN / tex.

Two wrapping yarns made of polyoxadiazole Arselon light-stabilized fibers have a linear density of 15 to 30 tex, a decomposition temperature of more than 300 ° C, a tensile elongation of not more than 17% and a strength of at least 13 cN / tex.

The claimed structure of the combined yarn ensures the achievement of a technical result, and the separation or introduction of changes to reduce or increase these indicators does not lead to the achievement of a technical result of the invention.

A combined thread has been developed in which all the indicators characterizing it are not functionally independent, but are interconnected, and only when they are performed together the technical result increases quantitatively: the stiffness of the thread during bending and torsion decreases significantly, as well as physical and mechanical and performance properties of the thread.

A decrease in the disequilibrium index of the composite yarn leads to an improvement in its processing ability at an economical expense for fabric manufacturing.

The choice of the number of wraps in the range of 220-390 rpm / m results in lower linear density of the finished thread and lower consumption of constituent components.

The claimed combined thread was developed on domestic equipment in the production conditions of MGUDT (Moscow).

The invention is illustrated by the following examples: 1-3, physical and mechanical properties are shown in the table.

Example 1

We developed a combined yarn consisting of a Rusar-S complex para-aramid yarn, consisting of at least 200 elementary yarns, a linear density of 29.4 tex as a core thread, and two twisted polyoxadiazole arselone yarns with a linear density of 29.4 tex. The wrapping was carried out in two opposite directions, respectively, crosswise: first in the counterclockwise direction, and then in a clockwise direction, the number of wrappings was 360 rev / m. The tension of the core thread is 158 cN, the ratio of the twist values of the core thread and the wrap yarn is (0.5: 2.9), with their mass ratio, wt.%: Core thread - 31, wrap yarn - 69; the wrapped surface of the core thread is 70%, the linear density of the composite thread is 95.0 tex.

Example 2

A composite yarn has been developed, consisting of Rusar-S complex para-aramid yarn, consisting of at least 100 elementary yarns, a linear density of 14.3 tex as a core thread, and two polyoxadiazole arselone wrap yarns with a linear density of 29.4 tex. The wrapping was carried out in two opposite directions, respectively, crosswise: first in the counterclockwise direction, and then in a clockwise direction, the number of wrappings was 290 rev / m. The tension of the core thread is 106 cN, the ratio of the twist values of the core thread and the wrap yarn is (0.6: 2.9), with their mass ratio, wt.%: The core thread - 17, the wrap yarn - 83; the wrapped surface of the core thread is 78%, the linear density of the combined thread is 82.0 tex.

Example 3

A composite yarn has been developed, consisting of a Rusar-S complex para-aramid yarn consisting of at least 100 elementary yarns, a linear density of 14.3 tex as a core thread, and two polyoxadiazole arselone wrap yarns with a linear density of 25.0 tex. The wrapping was carried out in two opposite directions, respectively, crosswise: first in a counterclockwise direction, and then in a clockwise direction, the number of wrappings was 390 rev / m. The tension of the core thread is 180 cN, the ratio of the twist values of the core thread and the wrap yarn is (0.6: 3.9), with their mass ratio, wt.%: The core thread - 21, the wrap yarn - 79, the wrapped surface of the core thread is 73%, linear density of the combined yarn - 68.0 tex.

Example 4

A composite yarn consisting of a complex para-aramid yarn, Rusar-S, consisting of at least 200 elementary yarns, a linear density of 29.4 tex as a core thread, and two wrapping polyoxadiazole arselone yarns of a linear density of 25.0 tex was developed. The wrapping was carried out respectively in two opposite directions crosswise: first in the counterclockwise direction, and then - clockwise, the number of wrapping - 390 obkr / m. The tension of the core thread is 168 cN, the ratio of the twist values of the core thread and the wrap yarn is (0.5: 3.9), with their mass ratio, wt.%: Core thread - 34, wrap yarn - 66; the wrapped surface of the core thread is 65%, the linear density of the composite thread is 85.0 tex.

A high-quality combined thread of linear density 65-95 tex was developed with unique properties, namely high strength, low nonequilibrium index, good dyeability, reduced bending and torsional stiffness.

The resulting thread can be used to produce a thermo-, fire-retardant fabric, which is suitable for the manufacture of clothing for employees of the Ministry of Emergencies and the military.

Claims (3)

1. A composite thread made of a core complex para-aramid twisted yarn wrapped in two polyoxadiazole twisted yarns in opposite directions with an equal number of wraps, first counterclockwise, then clockwise, with a core thread tension of 55-180 cN, the ratio the values of twist of the core thread and wrapping yarn is (0.5-0.6) :( 2.9-3.9), and their mass ratio is within, wt.%: core thread 17-34; wrapping yarn 66-83. 2. Combined thread according to claim 1, in which the number of wraps is 220-390 obkr / m. 3. Combined thread according to claim 1, in which the wrapped surface of the core thread is at least 65% of the total area.

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