JPH0351332A - Covered elastic yarn - Google Patents

Abstract

PURPOSE:To obtain covered elastic yarn, having hand similar to that of silk, excellent in transparency and level dyeing properties and useful for lady's stockings by covering core yarn having a specific size with heat-set yarn, prepared by dry heat-treating yarn at a specified number of twists, setting the twists and having a specific torque. CONSTITUTION:The objective covered elastic yarn 3 obtained by helically wrapping covering yarn 2 (e.g. nylon 66) of 5-15 denier size composed of heat-set yarn, prepared by setting twists at 1580-15800/D<1/2> number of twists (T/m) according to dry heat treatment and having 8-200 T/m torque around core yarn 1 composed of elastic fiber (e.g. polyurethane-based elastic yarn) of 10-40 denier size.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a covered elastic yarn formed by spirally wrapping a covered yarn made of thermoplastic synthetic fiber such as polyamide around a core yarn made of elastic fiber such as polyurethane. In particular, the present invention relates to a coated elastic yarn of ultra-fine fineness used for women's long socks.

Conventional technology In general, textile materials used for women's socks, etc. are required to have moderate stretchability, high transparency, and uniform dyeing, and furthermore, the economic efficiency of high-speed production of these textile materials is required. Usually, a core yarn made of elastic yarn such as polyurethane is wrapped with thermoplastic synthetic fiber filament yarn such as polyamide as a covering yarn, and in this case, the covering yarn is untwisted or has a slight twist of 20 T/m or less. So-called flant yarns (drawn yarns that are not subjected to various types of first twisting) have been used.

However, in recent years, the market for women's long socks has become highly fashion-oriented, and there is a demand for products with an even more luxurious feel.For this reason, natural fiber silk thread is used as the covering thread that covers the elastic thread. It has become popular.

Problem to be Solved by the Invention However, when coated elastic yarn using natural fiber silk yarn as the covering yarn is used for women's long socks, it has a natural luster in appearance and is extremely supple to the touch. Although it has excellent characteristics, compared to the conventional coated elastic yarn using flat yarn, the product as a whole is somewhat less transparent, and the dyeing uniformity is also somewhat inferior. The problem was that it was expensive.

Therefore, the present invention aims to solve the above-mentioned difficulties, and its purpose is to create a texture similar to that of silk, a natural fiber, by using a covered elastic yarn using thermoplastic synthetic fiber as the covering yarn. It is an object of the present invention to provide a covered elastic yarn for women's long socks that has excellent transparency and level dyeing properties.

Means for Solving the Problems A covered elastic yarn is provided in which a covered yarn made of thermoplastic synthetic fiber is wound around a core yarn made of elastic fiber.

The fineness of the core yarn of the elastic yarn is 10D or more and 40D or less (hereinafter referred to as denier), and the covering yarn covering this core yarn is an ultra-fine fineness yarn of 5D to 15D.
1580 force D T/m or more 15800/, /fi T/
It is characterized by using a strong-twist machine-heat-sensed yarn 1~ that has a torque of 8 T/m or more and 200 T/m or less after being imparted with a strong twist of not more than m or more and immediately subjected to dry heat treatment to stop the twist. It is something.

A core yarn made of elastic fibers with an action of 10D to 40D,
The coated elastic yarn is made by applying a predetermined strong twist to the ultra-fine fineness yarn of D, and then winding the coated yarn in a spiral shape after dry heat setting and fixing the twist.The appearance of the coated elastic yarn is that the coated yarn is highly twisted. This twist causes diffuse reflection.

This diffused reflection gives it an appearance similar to silk. Here, it is preferable that the fineness of the core yarn of one elastic yarn is 10D to 40D, and the fineness of the covering yarn is an ultrafine fineness of 5D to 15D, in order to obtain a luxurious silky luster as long socks for women. Anything other than this is undesirable because the product value decreases. Further, when the twist of the covered yarn is 1580/J5 T/II+ or less, the appearance is not affected by the twist so much that it approaches the appearance of the synthetic fiber material of the covered yarn itself.

In other words, the appearance is similar to that of flat yarn, which is not desirable. On the other hand, the twist of the covered yarn is 15800/J 77
If it is more than m, the diffused reflection caused by twisting will be too strong, resulting in a result that is far from silk-like luster, and the unevenness will also become too large, which is undesirable as it will lose its silk-like suppleness. .

Furthermore, since the covered yarn is heat set on the machine using a dry heat heater, a natural luster closer to that of silk can be obtained compared to steam heat set.

By the way, if the coated yarn is twisted, the twist causes diffuse reflection, so the transparency of one coated elastic yarn itself as shown in Figure 1 is compared to when the coated yarn is a flat yarn as shown in Figure 6. and somewhat inferior. However, the appearance of this covered elastic yarn itself is somewhat rounded compared to flat yarn due to twisting, so when this rounded yarn is knitted on a knitting machine, the stitches are As shown in Fig. 7, which was photographed under magnification using a microscope, the voids between adjacent stitches are larger than in the case of the conventional flat yarn shown in Fig. 8, and as a result, the porosity increases. The transparency of the product as a whole is significantly improved.

In addition, the coated yarn can be dry heat treated to achieve 87/m or more 200
To have a torque of T/m or less.

First, if the torque is 87/m or less, when dry heat treatment is performed,
If the heat setting is more effective than necessary, the texture will be poor, and the product value will decrease due to the loss of heat capacity during the finishing process.

Furthermore, when packaged.

This is not preferable because the winding shape deteriorates and the yarn layer collapses easily. On the other hand, if the length is 20,077 m or more, troubles due to snarls are likely to occur in the seventh step and the unwinding property of the package is also poor, causing problems in the drying industry.

EXAMPLE An example of a covered elastic yarn for carrying out the present invention will be explained in detail with reference to the drawings. FIG. 1 shows an example of a single covering yarn, and 1 is a core yarn made of polyurethane elastic yarn. A covered yarn 2 made of thermoplastic synthetic fiber is spirally wound around the elastic yarn 3 to form a covered elastic yarn 3.

Figure 2 shows an example of a double covering yarn, in which the inner covering yarn 4 and the outer covering yarn 2 are wound around a core yarn 1 made of elastic yarn so that the twist directions are opposite. The relationship is such that the torque caused by these coverings alone cancels each other out on the inside and outside.

These coated elastic yarns are manufactured on a covering machine shown in FIG. That is, first, the elastic yarn 1 serving as the core yarn is pulled out by the feed roller 5 and fed into the hollow spindle 6. On the outside of this hollow spindle 6, there is a covered yarn 4.
A bobbin 7 on which is wound is attached, and as the hollow spindle 6 rotates, the covered yarn 4 unwound from the bobbin 7 is wound around the core yarn 1 which is pulled up through the hollow part.

Next, the core yarn 1 around which the covered yarn 4 is wound is fed into the hollow spindle 8, and here the core yarn 1 is fed into the hollow spindle 8 again.
The covered thread 2 is wound around a bobbin 9 attached to the outside of the
is wound around this core yarn 1, and further passed through a top roller 10 and wound up as a package 12 by a take-up roller 11. The above explanation refers to the case of manufacturing the double covering yarn 7 (D) shown in FIG. 2, and in the case of a single covering yarn, the hollow spindle 6 is not shown in FIG. 3.

This is the case where there is one hollow spindle 8.

Here, the core yarn 1 is preferably a polyurethane elastic yarn that is generally referred to as spandex fiber.
Other types of elastic fibers may also be used.

However, the fineness is 10D or more for women's long socks.
A value of 0D or less is preferable, and values other than this are not preferable because the commercial value decreases.

The covering yarn 2 is made of thermoplastic synthetic fibers such as nylon 6 (glassy transition point: about 40°C, softening temperature: about 180°C) or nylon 66 (glassy transition point: about 50°C).

Polyamide fibers with a softening temperature of approximately 210°C,
Polyethylene terephthalate (glass transition point near 0)
~80°C, softening temperature: approximately 220°C), and is not limited to the type of fiber, but has dyeing properties, elastic recovery rate, strength, elongation, abrasion resistance, etc. Superior nylon 66 is preferred.

The coated yarn needs to have an ultrafine fineness of 5D to 15D. This is because, in any other case, the transparency of the knitted fabric will be lost.

In addition, the covered yarn 2 must have a twist number (T/m) of 1580//15''T/m or more.
5800/J577m or less, and the torque must be in the range of 8 T/m or more and 20077 m or less after dry heat treatment. That is, in this case, the twist of the covered yarn 2 is tsaoz
, /i15" If it is less than 77m, it will not be affected by twisting much and the appearance will be close to that of the synthetic fiber material of the covered yarn itself,
In other words, the appearance is similar to that of flat yarn, which is not desirable. On the other hand, the twist of the covered yarn is 15800//i5"
When T/m or more, the diffused reflection caused by twisting is too strong, resulting in a result that is far from silk-like luster.

The unevenness becomes too large and the silk-like suppleness is lost, which is not desirable. The most preferable heating number is 15
80/J5 T/m or more 15800/, gf;
It was below T/m.

In addition, dry heat treatment is applied to the coated yarn to obtain 87/m or more 2007
To have a torque of 7m or less.

First, if the torque is 87/m or less, when dry heat treatment is performed,
Heat setting is more effective than necessary, resulting in poor texture and loss of heat setting capacity in the finishing process, resulting in a decrease in product value.

Furthermore, if it is made into a pancage, the shape of the first roll becomes poor and the yarn layer collapses easily, which is not preferable. On the other hand, 200 T/
m or more, the unwinding property of the flanged bobbin 9 on which the covered yarn 2 is wound is poor on the covering machine shown in FIG. This is because elastic threads are formed, which is undesirable.

Note that the torque referred to here refers to the rotational twist of the yarn, and a yarn that has been sufficiently heat-set has less torque. This measurement method involves lowering a weight of 0.1 g/D to the center of a 1 m thread, aligning both ends at the center, rotating freely for 5 minutes, and then measuring 0.1 g/D at the center, excluding 0.125 m above and below. The number of turns of 25 m of yarn is measured. The average value of 10 samples is expressed as torque.

FIG. 5 shows the relationship between the fineness of the covered yarn and the torque it has after the covered yarn is heated and heat-treated to stop twisting.9 The present invention is directed to the shaded area.

In addition, the covered yarn 2 needs to be heat-set with a dry heat heater, but if this is done in a batch system that generally heat-safets highly twisted yarn, it will not be possible to obtain a natural luster similar to that of silk. .

This is because the gloss becomes somewhat dull.

Here, an example in which the covered yarn 2 is manufactured by dry heat setting is shown in FIG. 4.

That is, in FIG. 4, the yarn pulled out from the supply pirn 22 stationary at the center of the double-twisted yarn spindle 21 is controlled by a tension control device (not shown) installed at the head of the supply pirn 22. The eye guide 24. passes through the spindle center hole, exits from the edge of the spindle disk 23, and balloons the outside of the supply pirn 22. After being twisted through the overfeed roller 25, the guide roller 26
The guide bar 30. It is wound up on a flanged bobbin 32 via a traverse guide 31. In this case, when the heating device 27 applies heat to the twisted yarn, the twist imparted to the yarn is fixed.

Next, regarding the transparency of the covered elastic yarn, if the covered yarn is twisted, the transparency of one covered elastic yarn itself will be lower than that of a conventional flat yarn with almost no twist in the covered yarn. somewhat inferior in comparison. That is, if the covered yarn is twisted as shown in Figure 1, the single covered yarn itself is inferior to the case where the covered yarn is a flat yarn as shown in Figure 6 due to the diffused reflection caused by this twist. It is. However, because the coated elastic yarn itself is twisted, it has a somewhat rounded appearance compared to the coated elastic yarn when flat yarn is used, so this rounded yarn is knitted with a knitting machine. As shown in Fig. 7, the gap between adjacent stitches is the 8th stitch.
Compared to the case where the conventional flat yarn shown in the figure is used, the porosity increases, and as a result, the transparency of the product as a whole increases significantly.

Next, regarding the dyeability of the covered elastic yarn, there is not a very clear difference between the two yarn bodies of the present invention and the conventional case. However, due to the increased voids between adjacent stitches, the product as a whole has a rich, light tone with even dyeing and uniform dyeing, making it suitable for elegant and luxurious women's long socks. I got what I wanted.

Next, use polyurethane elastic thread as a core thread of 20 denier.

Table 1.2 shows the evaluation of knitted fabrics using coated elastic yarns produced by changing the fineness, heating number, and heat setting method of nylon 66 as the coated yarn.

The knitting machine conditions were a flat knitting structure, 400 needles, a cylinder diameter of 338 inches, and 4 yarn feeders. Covered elastic yarns and low elastic yarns were alternately knitted in each course in the wale direction. There is. Here, the low stretch yarn is a non-twisted flat yarn in the conventional example, but is a heat set yarn in both the present invention and the comparative example.

Table 1 Table 2 Site evaluation criteria ◎ Excellent ○ Good Δ Fairly good Compared to conventional products, we used products manufactured under A product with excellent transparency and level dyeing properties can be obtained, and furthermore, it can be provided at a lower cost than when silk is used as the covering thread.

[Brief explanation of drawings]

1 and 2 are perspective views of covered elastic yarns showing examples of the present invention, of which FIG. 1 shows the case of a single covering yarn, and FIG. 2 shows the case of a double covering yarn. FIG. 3 is a schematic explanatory diagram of the main parts of a covered elastic yarn manufacturing device, FIG. 4 is a schematic explanatory diagram of a covered yarn manufacturing device, and FIG. 5 is an explanatory diagram showing the relationship between the fineness of the covered yarn and torque. Fig. 6 is a perspective view of a conventional covered elastic yarn when the covered yarn is flant yarn, Fig. 7 is an enlarged photograph showing an example of a knitted fabric using the covered elastic yarn of the present invention, and Fig. 8 is a conventional covered elastic yarn. This is an enlarged photograph showing an example of a knitted fabric using. 1-・-11-- Core thread 2 ----------
- One-covered thread 3 - One-covered elastic thread

Claims (1)

[Claims] In a covered elastic yarn formed by wrapping a covered yarn made of thermoplastic synthetic fiber around a core yarn made of elastic fiber, the fineness of the core yarn of the elastic yarn is 10D or more and 40D or less (hereinafter D represents denier). and the covering yarn has a diameter of 5D or more and 1
1580/√DT/m or more for ultra-fine fineness of 5D or less 158
00/√DT/m or less twisting with dry heat treatment to 8T
1. A coated elastic yarn comprising a heat-set yarn having a torque of 200 T/m or more and 200 T/m or less.