RU2286412C1 - Method for manufacture of twisted reinforced thread - Google Patents

Abstract

FIELD: textile industry, in particular, manufacture of twisted reinforced thread.

SUBSTANCE: method involves introducing two non-twisted complex threads into fibrous flow of semi-finished product obtained in the process of drawing by means of drawer of ring spinning machine; determining distance between threads by multiplying empiric coefficient of 0.7-1.3 by partial of dividing the value of linear density of joining thread (tex) by value of linear density of joining thread fiber (tex), said values being multiplied by diameter of joining thread fiber (mm); in formed twisting triangle, twisting threads together with joining thread while dividing joining thread fibers into two parts to produce reinforced components, which are in their turn twisted together with each other.

EFFECT: improved physico-mechanical properties of threads owing to creating homogeneous elastoplastic composition, and increased wear-resistance of thread.

5 tbl

Description

The invention relates to the textile industry and is intended to obtain a twisted reinforced bicomplex thread.

It is known that reinforced yarn is formed from a core, which is a complex, for example, polyester thread, consists of 30-96 filaments and, for example, cotton or polyester staple fibers, wrapped around the core as a result of spinning and formed in the form of the so-called braid.

Loose braiding around the core leads to a shift of the fibers from the core, the formation of defects in the yarn in the form of gaps and cones, which affects the quality of the sewing threads and leads to their breakage during use.

There are various ways to increase the strength of the thread, improve braiding, including by applying to the core of various important adhesives. However, this circumstance significantly complicates both the process and the design of the spinning machine due to the location of the preparation devices on the machine frame; even if there is one for each spindle, there are hundreds of additional devices for the spinning machine, which will complicate the maintenance of the machine.

The prior art method for producing a twisted reinforced thread according to US Pat. RF 2107760, IPC 7 D 02 G 3/38, 03/27/1998, according to which, on a ring spinning machine, twisted fiber threads are fed into two separate fiber streams of the semi-finished product, which, upon exiting the fume hood, form reinforced components by wrapping the bar-shaped complex threads with a small ball.

A significant drawback of the method known from the aforementioned source of information is that the fibers of each of the fibrous streams are not twisted with a twisted multifilament thread introduced into the stream, but are in a free state, which leads to subsequent sheathing of the braid. In addition, the connection by twisting two fibrous structures - a fibrous stream and a twisted core thread, which differ sharply in their physicomechanical properties, cannot provide an equilibrium and equal strength yarn.

Moreover, when winding the twisted multifilament yarn from the package on the segment between the package and the exhaust roller of the exhaust device, periodic succrutins are formed, which leads to the appearance of a periodic unevenness in the twisted yarn at the outlet of the exhaust device. The frequency of formation of succrutin is caused by changes in the tension of the twisted multifilament yarn depending on the place where the yarn comes off the package installed on the frame of the spinning machine — nose, body or nest.

The objective of the present invention is to eliminate the above disadvantages with the achievement of the technical result, which consists in improving the physico-mechanical properties of the thread by creating a homogeneous elastic composition and, as a result, increasing the wear resistance of the thread.

This object is achieved by the fact that in the method for producing a twisted reinforced thread on a ring spinning machine, characterized in that two non-twisted multifilament yarns are introduced into the fibrous stream of the semi-finished product formed during drawing on the exhaust device, spaced apart from each other by a distance equal to

S = ρ × Tm / Tw × d, mm,

where ρ = (0.7-1.3) is the coefficient, the value of which is determined by the tortuosity of the processed fibers;

Tm - linear density of sliver, tex;

Tv - linear density of sliver fiber, tex;

d - fiber diameter of sliver, mm

and in the resulting triangle, torsion is twisted together with the sliver, while dividing the fibers of the sliver into two parts, with the formation of reinforced components, which, in turn, twist together.

As a result of this method, the sliver fibers are twisted with complex yarns, and between two twisted reinforced strands (components).

This ensures a strong bond of the fibers of the sliver and the multifilament yarn to obtain a homogeneous elastic structure that is devoid of such defects as a “brace”.

A method of obtaining a twisted reinforced thread is as follows. In the frame of the spinning machine, cops with a polyester complex thread and roving spools with rovings made, for example, of polyester staple fibers, are installed. The roving is stretched on a fume hood and is discharged in the form of a sliver by the front fume pair. Two complex polyester filaments are introduced between the exhaust cylinder and the exhaust roller and are located on the sliver fibers at a distance S from each other and are twisted together with the sliver in the resulting torsion triangle, splitting the sliver fibers into two parts with the formation of reinforced components, which, in turn, are twisted together.

Since the value of S depends on the value of ρ, we conducted studies to optimize it and identify the effect on the physical and mechanical properties of threads.

Table 1 presents the results of experimental studies of the influence of the coefficient ρ on the physicomechanical properties of the threads developed by the present method.

Table 1. No. p / p Name of indicator The value of the coefficient of crimp, ρ 0.48 1.12 1.47 one. Linear density tex 67.5 70.7 69.9 2. Breaking load, cN 3111 3352 3160 3. Relative breaking load, cN / tex 46.1 47.4 45,2 four. The coefficient of variation in breaking load,% 3.6 2,3 3,7 5. Elongation at break,% 23,2 20.1 22.1 6. The coefficient of variation in elongation,% 3.9 2,8 3.3 7. Nonequilibrium, turns / m 1.9 0.6 2,3

From an analysis of the data presented, it follows that both a decrease and an increase in the coefficient ρ below or above the stated limits leads to a deterioration in the quality index of the threads.

Table 2 shows the results of comparative tests of the quality of the threads produced by the claimed method and the method of the prototype, which indicate that the threads developed by the claimed method are more uniform in strength and elongation, balance and higher wear resistance, due to their structure and a method for fixing the braid during the spinning process.

Table 2. No. p / p Name of indicator According to the claimed method According to the prototype method one. Linear density tex 70.7 71.2 2. Breaking load, cN 3352 3239 3. Relative breaking load, cN / tex 47.4 45.5 four. The coefficient of variation in breaking load,% 2,3 8.3 5. Elongation at break,% 20.1 23,2 6. The coefficient of variation in elongation,% 2,8 7.4 7. Nonequilibrium, turns / m 0.6 3,5 8. Saving the strength of threads when sewing,% 94.0 83,2 9. Saving the strength of the thread in the loop after abrasion in the needle,% 67.6 52.9 10. The preservation of the strength of the thread after abrasion in the needle,% 77.3 61.3

Reinforced yarn for the production of reinforced yarns was produced on a P-76-5M4 spinning machine from 0.13 tex staple polyester fibers, 37.8 mm long and 11.3 tex polyester yarns. The fuel twist of the left yarn was 609 cr / m.

At the same time, yarn was produced with physico-mechanical indicators presented in table 3.

Table 3. No. p / p Name of indicator Value one. Linear density tex (number) 30.9 (32.4) 2. The coefficient of variation in linear density,% 1,0 3. Breaking load, gs 1708.2 four. Relative breaking load, gf / tex 55.3 5. The coefficient of variation in breaking load,% 2.6 6. Elongation at break,% 14.2 7. Twist direction S 8. Twist, cr / m 609 9. Twist coefficient 33.3 10. The percentage of slivers made of plastic staple fiber 0.13 tex 26.9 eleven. The percentage of polyethylene complex yarn 11.3 tex in the core 73.1

Table 4 presents the indicators of the physicomechanical properties of polyester fibers of 0.13 tex, and Table 5 presents the indicators of the physicomechanical properties of polyethylene complex yarns.

Table 4. No. p / p Name of indicator Value one. Linear density tex (number) 0.132 (7576) 2. Breaking load of elementary fiber, gf 8.3 3. Relative breaking load of elementary fiber, gf / tex 63 four. The elongation of the elementary fiber at break,% 18.0 5. Fiber length mm 37.8 6. The number of twists per 1 cm 4.1

Table 5. No. p / p Name of indicator Value one. Linear density tex 11.28 2. Breaking load, gs 667.0 3. Relative breaking load, gf / tex 59.1 four. The coefficient of variation in breaking load,% 4.3 5. Elongation at break,% 13.6 6. The coefficient of variation in elongation,% 7.0 7. The number of filaments in the complex thread 32

Claims (1)

A method for producing a twisted reinforced yarn on a ring spinning machine, characterized in that two non-twisted multifilament yarns are introduced into the fibrous stream of the semi-finished product formed during drawing on the exhaust device, spaced apart by a distance equal to S = ρ × Tm / Tw × d, mm, where ρ = (0.7-1.3) is the coefficient, the value of which is determined by the tortuosity of the processed fibers; Tm - linear density of sliver, tex; Tv - linear density of sliver fiber, tex; d is the fiber diameter of the sliver, mm, and in the resulting triangle, torsion is twisted together with the sliver, while dividing the fibers of the sliver into two parts, with the formation of reinforced components, which, in turn, twist together.