JPH0413455B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to spun yarns such as cotton yarns and woolen yarns, elastic yarns such as spandex (registered trademark) yarns, and crimped yarns such as woolly nylon yarns. The present invention relates to a method for manufacturing yarns that are made to have elasticity by doubling yarns.

Prior Art Conventionally, one of the methods for producing the above-mentioned composite yarn of spun yarn and stretchable yarn is to simultaneously insert stretchable yarn into the spun yarn during the spinning stage to form a so-called core yarn. It is well known that another method is to combine ready-made spun yarn and elastic yarn by covering or twisting.

The former method, in which the core yarn is made into a core yarn at the spinning stage, allows the spun yarn to become a sheath yarn that covers the elastic yarn well, but it can only be used for large lots, and post-processing is difficult. Therefore, it is a method of low practical value. In particular, this method is not used at all in the case of animal hair spun yarn because it is produced in small quantities in a wide variety of products. In addition, even in the case of cotton spun yarn, this method is only used in extremely limited applications such as underwear and some tights. The reason is that fluffing is difficult and gas yarn cannot be used, nor can yarn-dyed yarn be used. Therefore, the method of making core yarn at this spinning stage is advantageous in that it can be carried out freely even in small lots, and that post-processing such as using gas yarn or yarn-dyed yarn can be carried out without problems. There is a tendency to temporarily shift to the latter method, in which spun yarn and elastic yarn are combined by covering or twisting.

However, when a method of combining ready-made spun yarn and elastic yarn by covering or twisting is carried out, the twist of the spun yarn is increased or decreased, resulting in poor texture of the yarn. Not only is there a risk of fraying and weakening of the strength, but it is also difficult to create something in which a spun yarn such as a core yarn becomes a sheath yarn and elastic yarn is inserted into it. is exposed on the outside of the spun yarn, which is not only unsightly but also causes the elastic yarn to be easily damaged by friction.No effective method to solve this problem has yet been realized.

That is, using a covering machine, a stretchable yarn such as an elastic yarn such as Spandex (registered trademark) is used as a core yarn, and in a stretched state, a spun yarn is wound around this in the twisting direction of the spun yarn. According to this covering method, the spun yarn is twisted too much, which makes it stiff and has a poor texture, and the torque increases, resulting in inferior quality yarn. Therefore, in this case, if the covering direction of winding the spun yarn around the core yarn is opposite to the twisting direction of the spun yarn, even if the texture is improved, the spun yarn will be untwisted and the tensile strength will be weakened. It will have to be reinforced with reinforcing thread such as nylon thread. In any case, in this covering method, the thin elastic yarn is used as the core yarn, and the spun yarn, in which the fibers are bundled and twisted, is wrapped around it, so the elastic yarn is on the outside of the spun yarn. It is impossible to avoid exposure to.

In addition, by twisting the spun yarn and the stretched stretchable yarn in the twisting direction of the spun yarn or in the opposite direction, the twist of the spun yarn can be enhanced by simply twisting the stretchable yarn. The result is almost the same as in the covering method described above, in that the stretch yarn is exposed on the outside of the spun yarn.

In addition, according to a method in which, contrary to the previous case, the spun yarn is made into a core yarn using a covering machine, and the stretchable yarn is wound around this in the stretched direction in the twist direction of the spun yarn or in the opposite direction to the twist. Since there is no change in the twist of the spun yarn, there is no risk of loss of texture or strength, which is a good thing, but in this case, the elastic yarn is wrapped over the spun yarn, so it will not change in the previous case as well. Furthermore, it is unavoidable that the elastic yarn is exposed on the front side of the spun yarn.

Purpose of the Invention In view of the above circumstances, the present invention combines ready-made spun yarn and elastic yarn without impairing the texture and strength of the original spun yarn.
The purpose of this method is to enable the elastic yarn to be folded into a spun yarn so that it is tightly integrated in a manner that it is wrapped around the spun yarn.

Structure of the Invention The present invention involves untwisting a ready-made spun yarn so that it is untwisted or nearly untwisted, and then adding stretched elastic yarn to the untwisted or almost untwisted state. This was developed based on the fact that when the elastic yarn is twisted to return to its original twist, the elastic yarn shrinks and becomes wrapped in a fiber bundle of spun yarn. In other words, the gist of the present invention is to untwist spun yarn using a false twisting device to make it untwisted or nearly untwisted, and then add stretchable yarn such as stretched elastic yarn or crimped yarn to this. After passing through a false twisting device, the spun yarn is restored to its twist, and the stretchable yarn is apparently covered with the spun yarn due to contraction of the stretchable yarn.

According to this method, the spun yarn is apparently covered with the stretchable yarn, and the stretchable yarn is tightly integrated with the spun yarn so that it is wrapped around the spun yarn, and the stretchable yarn is almost never exposed outside the spun yarn. By restoring the twist of the yarn, the original texture and strength are not impaired, and thus a good double yarn with the desired elasticity can be obtained.

According to this method, it is most effective to impart elasticity to spun yarn using single yarns such as cotton yarn or woolen yarn, especially spun single yarns of short fibers such as cotton yarn. It can also be used. When using double yarn, the stretched elastic yarn is attached to the untwisted part of the two single yarns that make up the double yarn, and the twist is restored later. The shape is similar to that of twisted single yarn and stretched elastic yarn, but it is effective and good for imparting elasticity to yarns that cannot be achieved with single yarns, such as fine-count mercerized cotton yarn. You can get thread. In addition, the stretchable yarn may be a single Spandex (registered trademark) yarn, or an elastic yarn such as Spandex (registered trademark) yarn combined with a suitable yarn such as nylon yarn in the form of a covering or splint, or nylon or Tetron yarn. It is possible to freely use various elastic or stretchable elastic yarns, such as crimped yarns made of materials such as, crimped yarns that are stronger than woolly nylon, etc.

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

First, in the example shown in FIG. 1, the spun yarn T ₁ is
From a supply source (not shown), the elastic yarn passes through a supply roller 1, inside a hollow bobbin spindle 3 supporting a elastic yarn bobbin 2 on which the elastic yarn is wound, then through a false twisting device 4, and then through a take-up roller 5. The film is then wound up by a winding section (not shown). Then, the stretchable yarn T ₂ is fed out from the stretchable yarn bobbin 2 through a flyer 6 provided coaxially with the bobbin spindle 3, and is combined into the spun yarn T ₁ at the false twisting device 4. That is, the false twisting device 4 is
A hollow false twisting spindle 4a is equipped with a false twisting pin 4b, and the spun yarn passing through the bobbin spindle 3
T ₁ and the elastic yarn T ₂ that is fed out from the bobbin 2 through the flyer 6 are passed through the false twisting spindle 4a so that they are aligned and engaged with the false twisting pin 4b, and then reach the take-up roller 5. do.

Here, the bobbin spindle 3 is rotated by a drive belt 7 or the like. and bobbin spindle 3
The rotation of the shaft 11 is transmitted to the shaft 11 via the timing pulleys 8, 9 and the timing belt 10, and the rotation of the shaft 11 is transmitted to the false twist spindle 4a via the timing pulleys 12, 13 and the timing belt 14, and the timing pulley 15 , 16 and to the flyer 6 via the timing belt 17, the flyer 6 is actively rotated together with the false twist spindle 4a in conjunction with the bobbin spindle 3 in the same direction as the bobbin spindle 3. to regulate. And in this case, bobbin spindle 3
A suitable constant difference is provided between the rotation of the flyer 6 and the rotation of the flyer 6, so that the rotation of the flyer 6 and the rotation of the false twisting spindle 4a are substantially the same. For example, while the bobbin spindle 3 rotates 10,000 times, the flyer 6 and the false twisting spindle 4a rotate 10,050 times.
It is assumed that the rotation is approximately 10,100 times. Further, the elastic yarn bobbin 2 is made by winding elastic yarn to a constant length per round from beginning to end.

By doing this, the spun yarn T ₁ is untwisted by the rotation of the false twisting device 4 and becomes a non-twisted or almost non-twisted fiber bundle, which reaches the false twisting pin 4b, and this The elastic yarn T ₂ is tied together at the twisted place. At this time, the elastic thread T ₂ is attached to the bobbin spindle 3.
Due to the difference in rotation between the flyer 6 and the flyer 6, it is actively fed out while maintaining a constant elongated state, and since the rotation of the flyer 6 and the rotation of the false-twisting spindle 4a are almost the same, it reaches the false-twisting pin 4b. The false twisting pin 4a is attached to the untwisted fiber bundle of the spun yarn T ₁ in an aligned manner without almost wrapping it around the fiber bundle.
pass through. Spun yarn untwisted in this way
After T ₁ passes through the false twisting pin 4a with the elastic thread T ₂ attached and doubled, the original twist is restored by its rotation, and it passes through the take-up roller 5 and becomes the desired twisted yarn. It is wound up by the winding section. Here, the spun yarn
T ₁ is untwisted throughout the false twisting device 4 and becomes a non-twisted or nearly non-twisted fiber bundle with almost no tensile strength, but there is a risk of it being cut due to being actively fed by the co-feed roller 1. There is no.

Thus, if the spun yarn T ₁ is a single yarn, as shown in Figure 5, the single yarn T ₁ is untwisted and the stretchable yarn T ₂ is attached to A in a stretched state, and then the twisted yarn is By recovering and contracting the stretchable yarn _T2 , the stretchable yarn _T2 apparently covers the single spun yarn _T1 , and in this way, the stretchable yarn _T2 becomes the single spun yarn T1. The single spun yarn T 1 is tightly integrated in the form of being wrapped around _{the T 1} yarn, with almost no exposure to the outside, and the single spun yarn T ₁ is a good doubled yarn T that is given elasticity without losing its original texture and strength. is formed. In addition, when the spun yarn T ₁ is a double yarn, the 6th
As shown in the figure, when the twin yarn is untwisted from the two single yarns that make it up, the elastic yarn _T2 is attached to A in a stretched state, and then the original twisted state is restored. By shrinking the elastic thread T ₂ , the elastic thread T ₂
is covered with two single yarns in a twisted manner and tightly integrated, and in this way, a well-matched doubled yarn T with elasticity imparted to the double yarns is formed.

In the embodiment shown in FIG. 1 above, the flyer 6 is actively rotated, and the elastic yarn T ₂ is actively controlled to be stretched from the bobbin 2 to a constant state by the rotation difference between the flyer 6 and the rotation of the bobbin spindle 3. Spandex (registered trademark name) on elastic yarn T ₂ because it can be sent out.
This is advantageous when using a yarn that is highly stretchable and elastic and has a very high expansion and contraction ratio, such as a single yarn.

Next, in the embodiment shown in FIG. 2, the elastic yarn from bobbin 2 is
This embodiment differs from the embodiment shown in FIG. 1 in that the flyer 6 for guiding the delivery of _T2 is allowed to freely rotate without being actively rotated to restrict its rotation. In this case, the elastic yarn T ₂ is passively let out from the rotating bobbin 2 in a state where it is stretched almost to the limit due to the resistance of the flyer 6, and the rotation of the bobbin 2 by the bobbin spindle 3 is controlled by the false twisting spindle 4a.
The rotation of the fryer 6 can be maintained approximately the same as the rotation of the false twist spindle 4a by making a suitable setting such that the rotation is slightly less than the rotation of the false twisting spindle 4a. Therefore, we regulated the degree of elongation by adding or covering appropriate threads such as nylon to stretchable thread _T2 and crimped threads that could be stretched to the limit without causing any problems, or to Spandex (registered trademark) threads. This method is suitable when using something like elastic thread.

Next, in the embodiment shown in FIG. 3, a twist stop device 18 having a twist stop pin 18a is provided between the bobbin spindle 3 and the false twist device 4, and the spun yarn T ₁ and the elastic yarn T _{2 are}
The wires are connected to the twisting pins 18a and then passed through the false twisting device 4. In this case, the spun yarn T ₂ is untwisted between the twisting pin 18a and the false twisting device 4, and the stretchable yarn T ₁ is attached in an elongated state and twisted.
By making the distance between the false twisting device 4 as short as possible and setting it to be smaller than the fiber length of the spun yarn T ₁ , it is possible to prevent the spun yarn T ₁ from being cut due to untwisting.
This eliminates the need to provide the supply roller 1 as in the embodiments of FIGS. 1 and 2.

Next, in the embodiment shown in FIG. 4, when the fryer 6 is actively rotated, the rotation is directly linked to the false twisting device 4. Then, the rotation of the false twisting device 4 is controlled from the shaft 11 to the timing pulley 1.
2, 13 and a timing belt 14 to another intermediate shaft 19, and then from this shaft 19 to another timing pulley 20, 21 and a timing belt 23. By making it possible to replace the timing pulley 20 with a different number, the number of twists and draft rate can be adjusted by replacing the timing pulley 20 without adjusting the thickness of the bobbin 2.

Effects of the Invention As described above, according to the method of the present invention, the ready-made spun yarn and stretchable yarn are wrapped in the spun yarn without impairing the texture and strength of the original spun yarn. This is an excellent method that has made it possible for the first time and easily to combine the threads so that they are tightly integrated without being exposed.

[Brief explanation of drawings]

1 to 4 are perspective views showing different embodiments of an apparatus for carrying out the method of the present invention, and FIGS. 5 and 6 show different embodiments of doubling yarns produced by the method of the present invention, respectively. FIG. T ₁ ... Spun yarn, T ₂ ... Elastic yarn, T ... Doubling yarn,
1... Supply roller, 2... Elastic thread bobbin, 3...
Bobbin spindle, 4... false twisting device, 4a... false twisting spindle, 4b... false twisting pin, 5... take-up roller, 6... flyer, 18... twist stopper, 18a... twist stop pin.

Claims (1)

[Claims] 1 Untwist the spun yarn using a false twisting device to make it untwisted or nearly untwisted, add stretchable yarn such as elastic yarn or crimped yarn in a stretched state, and after passing through the false twisting device, A method for producing a composite yarn of a spun yarn and a stretchable yarn, which comprises restoring the twist in the spun yarn and contracting the stretchable yarn so that the stretchable yarn is apparently covered with the spun yarn.