JP2542017B2 - Wall twist false twist yarn - Google Patents

Description

TECHNICAL FIELD The present invention relates to a wall-twisted false-twisted yarn obtained by composite false-twisting.

(Prior Art) Conventionally, as a method of making a wall twisted yarn using a multifilament yarn, when twisting a yarn in which undertwisting has been previously performed and an untwisted yarn, The method of plying is well known.

However, according to the processing method (using an Italian twisting machine), the middle twist to the strong twist of the lower twist are added to the multifilament yarn, and the same number of twists as the lower twist and the reverse direction of the lower twist are applied. Since a real twisting step of twisting together with a non-twisted yarn while twisting is required, it has drawbacks such as low productivity and high processing cost.

Also, a method for obtaining a wall twisted yarn by subjecting a false twisting process under a predetermined condition using a core yarn and a sheath yarn also made of multifilament yarns is disclosed in, for example, Japanese Patent Publication No. 50-35147. There is.

However, when it was carried out under the conditions disclosed in the publication, the obtained yarn had the yarn form shown in FIGS. 3 and 4. That is, in the case of the yarn shown in FIG. 3, the core yarn 1 constitutes the core portion in the single winding portion 13 ', and the sheath yarn 2 is simply wound around the core yarn 1 and covered. The so-called sheath yarn 2 does not have a wall-twisted tone in which the core yarn 1 is wound in a wave shape, and in the case of the yarn shown in Fig. 4, the core yarn 1 and the sheath yarn 2 are formed in the single winding portion 13 '. Was the aligned and twisted shape, and the wall twist tone was not obtained as in the above. Further, the yarn obtained by the same method has a triple winding part 12 ', 1 as shown in Figs.
2 ″ had an obvious slab shape, which was far from the wall twist yarn in addition to the above structure.

Japanese Unexamined Patent Publication No. 61-102444 discloses a slab portion having a triple winding portion and a middle portion having a crimped structure having a single winding portion, and a converging portion having a wall twist structure between the slab portion and the middle portion. A formed slab yarn is disclosed. However, the false twisted yarn disclosed in the publication has a wall twist structure only between the triple winding part and the midway part, and as a wall twist tone, it is extremely unsatisfactory from the viewpoint of feeling and appearance effect. It was enough.

(Problems to be Solved by the Invention) Therefore, the conventional method for producing a wall twisted yarn has a high processing cost and has a limited productivity. Therefore, it is attempted to obtain a wall twisted yarn by a composite false twisting process. Although good ideas have been made, the fact is that no yarn having the desired shape has been obtained.

The present invention was developed in view of such problems, and by using a composite false-twisting method that is inexpensive and excellent in productivity, it is possible to provide a wall-twisted false-twisted yarn having excellent texture and appearance effects. It is what

(Means for Solving Problems) Therefore, the present invention was obtained by a composite false twisting method in which a sheath yarn is overfeed-supplied at a certain distance in a twisting region of a core yarn and traverse winding is performed. A false-twisted yarn in which a heavy winding portion and a triple winding portion are alternately mixed, and a fineness ratio D1 / D2 between the fineness of the core yarn and the fineness of the sheath yarn is 3 to 30, and the single winding portion is Indicates a wall-twisted pattern in which the core yarn is wound in a wavy shape on the peripheral surface of the sheath yarn, and the apparent thickness of the triple wound portion and the single wound portion is approximately the same. The wall-twisted false-twisted yarn is a matter that is indispensable for its construction.

(Operation) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic diagram showing an example of an apparatus used for carrying out the method of the present invention and an embodiment of the apparatus.

The core yarn 1 is tensioned by a magnet tensor 3 and twisted by a spindle 6. On the other hand, the sheath yarn 2 is over-fed by the feed roller 4, and is supplied from the sheath yarn supply guide 11 keeping a constant distance from the twisting region of the core yarn 1 and traversed around the core yarn 1 to form a single winding portion. And a triple winding part are alternately formed to be a wall twist false twisted yarn.

In the figure, 5 is a heat fixing heater, 7 is a delivery roller, 8 is a set heater, 9 is a second delivery roller, and 10 is a wall twist false twisted yarn package.

In the above method, the first condition for obtaining the target yarn is the fineness D1 (d / f) of the core yarn.
The ratio D1 / D2 of the fineness D2 (d / f) of the sheath yarn 2 must satisfy the relationship of 3 to 30. If the fineness ratio D1 / D2 is less than 3, the triple winding portion 12 becomes too thick, and the obtained yarn becomes slab-like as shown in FIGS. 3 and 4, and the single winding is in the middle of the road. The turning portion 13 does not have a wall twist tone and exhibits a straight state. When the fineness ratio D1 / D2 is larger than 30, the triple winding part 12 is inconspicuous, but the sheath yarn 2 is buried in the core yarn 1 at the single winding part 13 in the middle of the road, and the wall twist effect is obtained. I can't.

The second condition is that the false twist number TW is 25,000 ≦ {D1 + D2 × (1 + overfeed rate / 100}.
It is in the range of ^1/2 × TW ≦ 40,000. If the false twist number TW is 25,000 or less, the winding angle is too small to obtain a sufficient wall twist effect.
With the above, workability becomes unstable.

The third condition is to set the overfeed ratio of the sheath yarn 2 to the core yarn 1 in the range of 80% to 130%. Sheath thread 2
When the overfeed rate is 80% or less, the winding angle and spacing are widened, the wall twisting effect is not exhibited, and the yarn converging property is also poor. Further, when the overfeed rate is 130% or more, the sheath yarn 2 is not sufficiently absorbed and the workability becomes unstable.

The fourth condition is that the relationship between the heat setting temperature Te and the glass transition temperature Tg of the yarn is within the range of Tg + 10≤Te≤Tg + 55.

As described above, according to the present invention, since it is necessary to set a relatively high false twist number, crimping is likely to be applied, and the feeling of raw yarn (name yarn) such as wall twist yarn obtained by a normal actual twisting method. It is difficult to obtain gloss. This leads to fluffy fabric and lack of drape. Therefore, it is effective to keep the heat setting temperature in the twisting region as low as possible and keep the crimping low. However, if the heat setting temperature is too low, the yarn bundle focusing property deteriorates, making it impossible to pass the post-process as well as the processability. Then, as a result of various experiments, it was found that the effect of satisfying both of them can be obtained by setting the heat setting temperature within the range of the above equation. However, this is not the case when only the wall twisting shape effect is required.

The present invention is obtained by satisfying the above-mentioned first to fourth conditions, and further explained with reference to external views of yarns shown in FIGS. In the false twisting method, for example, in Japanese Patent Publication No. 50-35147, the single winding portion 13 has a shape in which the core yarn 1 is simply covered with the sheath yarn 2 as shown in FIG. 3, or As shown in FIG. 4, the core yarn 1 and the sheath yarn 2 are in the form of aligned and twisted. At the same time, the triple winding part 12 has an obvious slab shape, while the yarn obtained by the present invention has a single winding part 13 on the peripheral surface of the sheath yarn 2 as shown in FIG. Since 1 has a sharp wall twist shape in which it is wound in a wavy shape, and the triple winding portion 12 does not seem to be thicker than the single winding portion 13 apparently, a good wall twisted false twisted yarn can be obtained.

The reason for this is that, as shown in the first condition of the present invention, the difference in the fineness of the sheath yarn 2 is made larger than that of the core yarn 1, and the false twist number according to the third condition is set. Since a large difference in the twist shrinkage ratio with the sheath yarn 2 occurs, the core yarn 1 having a large fineness has a greater twist shrinkage than the sheath yarn 2 having a fineness, and therefore the sheath yarn 2 becomes the core yarn 1 during twisting. In spite of being wound on the other hand, in the single winding portion 13, the sheath yarn 2 having a fineness constitutes the core portion at the time of decombustion, and the core yarn 1 having a large fineness constitutes the sheath yarn 2.
This is because it has a wavy winding structure. Further, since the triple-wound portion 12 is composed of the sheath yarn 2 having a fineness, the apparent thickness can be reduced, and the wall twist effect is further emphasized.

The third condition is a well-known essential condition for obtaining a true twist structure by the false twist method, but the supply distance of the overfed sheath yarn 2 to the core yarn 1 is not particularly limited, but this is 100 mm. By the above, the single winding part 13 becomes long and the wall twist effect is sufficiently obtained.

(Example) When the present invention was carried out under the processing conditions shown below using the polyester filament yarn 300d / 96f as the core yarn and the same 30d / 12f as the sheath yarn, the triple wound portion was hardly noticeable,
A clear wall-twisted false-twisted yarn having a wavy shape was obtained in the single-twisted portion. Table 1 shows the effect of changing the processing conditions.

Spindle speed: 93,000 rpm False twist number: 1,550 t / m ・ Z Heater temperature: Heat fixed 120 ℃, set 160 ℃ Sheath thread overfeed rate: + 100% Sheath thread supply guide distance: 400 mm from core thread Tension to core thread supply: 14.5g (Effects of the Invention) As described in detail above, according to the method of the present invention, it is possible to provide a wall-twisted false-twisted yarn having excellent feeling and appearance effects with high productivity and low cost.

[Brief description of drawings]

FIG. 1 is an overall schematic view showing an embodiment of the present invention together with an apparatus, FIG. 2 is an external view of a wall twist false twisted yarn obtained by the present invention, and FIGS. 3 and 4 are conventional composite false twisting methods. It is an external view of the slab false twisted yarn obtained by. Description of main parts of the figure 1 ... Core yarn 2 ... Sheath yarn 5 ... Heat fixing heater 6 ... False twisting spindle 8 ... Set heater 12 ... Triple winding part 13 ... Single winding part

Claims (1)

(57) [Claims] 1. A single-winding portion and a triple-winding portion obtained by a composite false twisting method in which a sheath yarn is fed over a twisting region of a core yarn while keeping a constant distance and wound in a traverse manner. Is a false twisted yarn in which the fineness D1 of the core yarn and the fineness D2 of the sheath yarn are D3 to D30, and the single-winding portion has a core yarn on the peripheral surface of the sheath yarn. Shows a wall-twisted texture wound in a wavy shape, and the apparent thickness of the triple-twisted portion and the single-twisted portion is approximately the same, and the wall-twisted false-twisted yarn is characterized.