JPH0345733A - Composite elastic yarn - Google Patents

Abstract

PURPOSE:To provide a composite yarn having large bulkiness, soft touch and good dyeability, reduced in the generation of pillings and free from the partial exposure of a core yarn and also from the incomplete covering of a sheath yarn by covering an elastic yarn with a polyester fiber bundle spun at a specific spinning, winding rate. CONSTITUTION:An elastic yarn preferably drafted is wound and covered with a polyester fiber bundle to provide a composite elastic yarn. The polyester fiber bundle is prepared by subjecting polyester fibers spun at a spinning winding rate of >=6000m/min, preferably 6000-7500m/min, preferably to a twisting treatment, cutting the twisted fibers into a length of 2-5 inches, spinning the prepared staple fibers and subsequently drafting the prepared rovings.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a composite elastic yarn, and particularly relates to a composite elastic yarn that is supplied in a drafted state and coats a polyester fiber bundle in the drafted state. be.

[Conventional technology]

Conventionally, known polyester fiber slivers have been used as coating fibers for composite elastic yarns formed by covering elastic yarns with polyester fiber bundles. This is the spinning winding speed of 100
The polyester tow spun at a speed of 0 m/min or less is crimped by the stretching-pushing method, and then 2 to 5
It was cut into inch lengths and formed into rovings by worsted spinning in a conventional manner.

[Problem to be solved by the invention]

Figure 2 (
As shown in C), a so-called ``meki J'' phenomenon occurs in which the elastic yarn is not concentrated in the core of the yarn structure, but a portion 1 located at the outer periphery of the yarn structure is partially observed in the yarn length direction. The obtained composite elastic yarn is processed in the preparation process such as the knitting and weaving process.
As shown in FIG. 3(e), a so-called "snuke" phenomenon occurs in which the covering fibers are squeezed and moved by a guide or the like, and the elastic yarn 2 used in the core is partially exposed. Furthermore, when the composite elastic yarn shrinks, that is, when the elastic yarn shrinks, the bulk is small, and if the number of twists is reduced to increase the bulk, the snaking phenomenon occurs frequently in the subsequent process. As a result, the snuke became smaller, but the texture became harder and there were problems such as a lack of bulkiness.

An object of the present invention is to eliminate the drawbacks of the conventional composite elastic yarns, and to provide a composite elastic yarn that has a high bulk, a soft feel, and less pilling.

[Means to solve the problem]

The present inventors have arrived at the present invention as a result of intensive studies to solve the problems of the prior art.

That is, the present invention provides a composite elastic yarn formed by covering an elastic yarn with a polyester fiber bundle, in which the polyester fibers constituting the polyester fiber bundle are spun at a winding speed of 6000 m/min.
It is characterized by being spun in minutes or more.

[Effect]

By using the polyester fiber bundle manufactured at the above-mentioned winding speed as the covering yarn, the elastic yarn is likely to concentrate in the core of the yarn, and the covering fiber is difficult to move during post-processing.
It is possible to obtain a composite elastic yarn that prevents the above-mentioned eye peeling and snag phenomena, has high bulkiness, and has a soft texture.

The polyester fiber bundle used for coating in the present invention includes:
Spinning winding speed of 6,000 m/min or more, preferably 6,000 m/min
A typical example is a sliver made of short polyester fibers obtained by crimping a polyester fiber bundle spun at ~7,500 m/min and cutting it into an appropriate length. If the spinning winding speed does not reach 6000 m/min, the bulkiness and texture of the obtained composite elastic yarn will be poor, and the above-mentioned eye spots and spots will easily occur.

Such a sliver is obtained by crimping a polyester fiber bundle spun at the above-mentioned take-up speed using the indentation method, then cutting it into a length of 2 to 5 inches using, for example, a Guruguru cutter, and subjecting it to the spinning process by a conventional method. It is manufactured by making roving by using the same method and drafting it. The composite elastic yarn of the present invention is obtained by supplying the elastic yarn used for the core in a drafted state, winding the aforementioned fiber sliver around the core, and spinning the yarn. The composite elastic yarn of the present invention is not limited to the above method as long as it can be obtained by combining and twisting a polyester spun yarn and an elastic yarn or by covering an elastic yarn with a polyester spun yarn, and the fiber bundle is not limited to a sliver. .

The elastic yarn used in the present invention may be any type of elastic yarn, such as polyurethane or polyolefin, and the polyester fiber obtained at a winding speed of 6000 m/min or higher for use in the skin may be any type of fiber. A spinning method may be used, for example, one obtained by Japanese Patent Application Laid-Open No. 58-208415. Any spinning method may be used for spinning and spinning the polyester fibers used in the present invention, and the single yarn denier, cut length, blending rate, spinning draft, and draft rate of the elastic yarn can be adjusted to meet desired requirements. can be determined.

The table below shows polyester fiber yarns with different spinning and winding speeds that have been subjected to stretching treatment as necessary to obtain a single yarn denier of 2 deniers, which are then processed into rovings in a conventional spinning process through a spinning process. This shows the crimp characteristics of the single filament that was created (indentation processing conditions Nisteam pressure 0.2 k
g/cffl, yarn speed 110 m/min, roll presser pressure 2
．． 0 kg, doctor blade pressure 2.6 kg/c+
a).

The crimpability of the yarn spun at a high speed of 6000 m/min or more in Table 1 shows the number of crimps: 14! The shrinkage/elongation ratio is low, and the crimp shape has a rounded crimp as shown in Figure 1 (b), which is similar to the zigzag crimp (Figure 1 (a)), which is unique to other yarn-like pressing processes. )).

Using the roving obtained with Nα4 in Table 1, composite spinning was performed with polyurethane fiber using a ring spinning machine to obtain a composite elastic yarn. The results are shown in Table 2.

As a result of dyeing only the polyurethane fibers and visually judging the graininess, it was found that all the fibers using rovings that had been hot-stretched and then subjected to a fluffing process at a spinning winding speed of 5000 m/min or less had graininess. In addition, evaluation of snooking by repeatedly using guides showed that the snooking was easy. Furthermore, when the bulk height of the composite elastic yarn using conventionally known polyester roving is set to 1, the bulk height is also 6000.
Approximately 10% uses polyester roving of m/min or more.
It has a high bulk level and a soft texture, and surprisingly, it has been found that although it has a high bulk level and a soft texture, it is difficult to chew.

Furthermore, even if the twist coefficient is lowered and the number of twists is reduced, there will be less eye strain, snags and pilling, and the bulkiness will be higher.
It was found that a composite elastic yarn with a soft texture could be obtained.

As mentioned above, the composite elastic yarn coated with roving using polyester fiber with a spinning winding speed of 6,000 m/min or more has a soft texture, has a high bulkiness, but has little pilling, and has a smooth texture. , resulting in a good composite elastic yarn with no snags.

Examples of the method for manufacturing the composite elastic yarn of the present invention are as follows.

Polyester fibers (single yarn denier 2.Od, 4B filament yarn) obtained at a spinning winding speed of 6000 m/min were bundled and crimped by a pressing method while applying steam heating (110°C), and then crimped for 2~ A 5 inch unequal length fiber stable was produced.

Four slivers of 40 g/m each made of this stable were given a draft of 8 times using an ink sexting gill.
A roving yarn of 0.3 g/m was passed through a gill, a roper, etc., and a draft of 16 times was applied using a spinning machine to produce a yarn of 1152 Nm. A core draft device applies an appropriate draft to the core polyurethane fiber, which is then guided to the front roller of a spinning machine, aligned with the skin yarn, and twisted to spin a composite elastic yarn.

Another method is to draw polyester fibers of 1152 Nm spun by the above-mentioned spinning machine and polyurethane fibers while applying a draft using a core draft device, supply them to a twisting machine, and twist them to form a composite elastic yarn. Alternatively, at this time, two polyester fibers of 1152 Nm may be aligned and twisted together with a drafted polyurethane fiber using a twisting machine to obtain a composite elastic fiber. Furthermore, as another method, it is also possible to form a so-called covering type composite elastic yarn in which polyester fibers of 1152 Nm are covered with polyurethane fibers using polyurethane fibers as a core thread.

〔Example〕

A fiber yarn whose main repeating unit is ethylene terephthalate, spun at a take-up speed of 7000 m/min, has an initial Young's modulus of 95 g/d, a cutting elongation of 40%, and a cutting strength of 4.2 g/d is bundled into 3000. Make it denier and add 40
After doubling to 10,000 denier yarn, preheating to 120"C and applying I4! shrinkage, cut length 76~102m.
The fibers were bias-cut, and rovings were prepared by conventional worsted spinning (roving yarn 0.5 g/m). This was set on a ring spinning machine with a spinning draft of 21 times. This spun yarn and polyurethane fibers of 30 denier were guided to a front roll at a draft rate of 3.0 times, and twisted at a twist coefficient α=60 to obtain a composite elastic yarn of 1/4 ONm of the present invention.

As a result of dyeing and dyeing the obtained composite elastic yarn into a knitted fabric, a good knitted fabric was obtained, which had no blemishes or snags, had a soft texture, was bulky, and had little pilling.

〔Effect of the invention〕

According to the present invention, by covering the elastic yarn with a fiber bundle made of polyester fibers at a spinning winding speed of 6000 m/min, the elastic yarn is easily concentrated in the core of the yarn structure, and it is also easy to concentrate in the preparation process for weaving and weaving. It is possible to obtain a composite elastic yarn or its fabric that does not easily move skin fibers even when squeezed with guides, etc., has a high bulk when contracted, has a soft texture, and is resistant to pilling. It will be done. Further, in the composite elastic yarn of the present invention, the coating fiber has good coloring property when dyed under normal pressure, the elastic yarn does not deteriorate, and a fabric exhibiting good elasticity even after dyeing can be obtained.

[Brief explanation of drawings]

FIG. 1(a) is a diagram showing the crimp structure of a conventional skin sliver, FIG. 1(b) is a diagram showing the crimp structure of a skin sliver used in the present invention, and FIG. 2(c) is a diagram showing the crimp structure of a conventional skin sliver. FIG. 2(d) is a conceptual diagram of the composite elastic yarn of the present invention, and FIG. 3(e) is a diagram showing the snaking portion of the conventional composite elastic yarn.

Claims (1)

[Claims] A composite elastic yarn formed by covering an elastic yarn with a polyester fiber bundle, characterized in that the polyester fibers constituting the polyester fiber bundle are spun at a winding speed of 6000 m/min or more.