JP2685516B2 - Flat manufacturing method and flattening device - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a flat yarn manufacturing method and a flattening apparatus suitable for the flat yarn, which have an unprecedented uniform appearance effect and further excellent productivity.

(Prior Art) A method is already known in which a twisted yarn is pressed by a pair of rollers to deform the cross section thereof and generate a special effect such as gloss. For example, Japanese Utility Model Publication No. 60-18440 discloses imparting strong gloss by flattening a yarn in which light is diffusely reflected by a twisted yarn and gloss is lost.
However, although this method can certainly give a strong gloss, it has a drawback that horizontal streaks run on the woven and knitted fabric and the appearance tends to be dull.

In addition, the method of pressing and flattening the yarn with the roller in this way is such that if the yarn has thickness irregularities, kinks, knots, strong twists, etc., it is difficult for the portion to pass through the roller and the yarn is easily cut. There was also a problem in terms of sex.

(Object of the invention) The main object of the present invention is to solve such problems, to provide a flat yarn product with less horizontal streaky spots, and to achieve excellent production without yarn breakage during processing. To provide a flat yarn manufacturing process having properties.

(Structure / Operation of the Invention) (1) Twisted state between a surface that reciprocates at least 15 times per second in a direction substantially perpendicular to the running direction of the yarn and a surface that faces the surface with the running yarn interposed therebetween. Flattening the cross section of the yarn with an oblateness of at least 30% by passing the yarn of the above and intermittently pressurizing the yarn between the both sides to crush it. Thread manufacturing method, and (2) A stationary plane and a moving surface that reciprocates at least 15 times per second in a direction substantially perpendicular to the surface, and intermittently presses the yarn running between the two surfaces. There is provided a flattening device characterized by being crushed.

FIG. 1 shows a known roller flattening method in which a yarn (1) is pressed by rollers (2) and (3) to form a flat yarn (1) '. Here, the yarn in the state (1) (circular cross section) has a dull gloss by diffusing light as shown in FIG. 2 (a), but as shown in FIG. 2 (b).
In the state (1) '(flat state), light is totally reflected,
It becomes a glittering thread that shines well.

However, in the case of this method, there is no problem during normal processing, but as shown in Fig. 3 (a), the thread (1) has a thick thickness (4), snare (4) ', and knot (4) ". It was found that there is a problem that if there is a part, that part is difficult to get caught between the rollers (2) and (3) as shown in (b), and the thread is easily broken at that part. Even if the roller (2) is pressed by the spring (5) and the space between the rollers (2) and (3) is opened at that moment as shown in (c), the mass of the roller (2) is suddenly large. In many cases, the yarn did not respond and was cut with a large force before the roller gap opened, which was not a fundamental solution.

As a result of various studies on this point, the present inventors have arrived at the flattening method and apparatus of the present invention shown in FIG. 4 and the flat yarn obtained thereby.

That is, the thread (1) runs between the pedestal (6) (still image) and the hammer (7) [reciprocating surface], and the hammer (7) is connected to the iron core (8). Further iron core (8)
Has a shape that is half thrust into the solenoid coil (9). The solenoid coil (8) is violently affected by the drop force due to its own weight and the continuous attraction force due to the alternating magnetic field of the solenoid coil (9). The movement is repeated up and down, so that the hammer (7) also moves up and down to beat the thread (1) on the pedestal (6) many times, and as a result, the thread (1) is crushed and flattened by its action.

According to the method of the present invention, even if the thread (1) has a thick portion (4) as shown in FIG. However, there is no problem at all, and there is no chance that the thread will get stuck in the roller and cut like the roller method in the previous term. Therefore, even if there is an irregular portion such as a kink or a knot as well as the thickness irregularity of the thread, the thread is not broken,
Stable processing is possible to enable unmanned operation.

Furthermore, as another feature, it was found that streaky spots were hard to run on the obtained product. That is, although the flat yarn woven fabric produced by the roller method described above has sharp streaks on the woven fabric, it is reduced by the method of the present invention.
Examining this point in detail, (a) since the flat surface of the flat yarn made by the roller method is too straight,
When it is made into a woven fabric, if the orientation of the flat surface is slightly deviated as shown in FIG. 6, the reflection of light is changed and streaky spots are likely to appear.

(B) On the other hand, in the case of the crushing method, the flat surface is twisted and crushed by the twisting torque of the yarn (1) itself at the time of crushing as shown in FIG. 7, resulting in the woven fabric. It is difficult for the phenomenon that the flat surface of the thread twists little by little as shown in FIG.
(C) A new fact has been found that it is particularly effective when twisting 4 times or more per m.

In this case, in order to impart such a gloss effect to the woven fabric by flattening the yarn, it is necessary that the yarn is flattened at an oblateness of at least 30% or more.

Here, the flatness of the yarn means that when the major axis and the minor axis in the cross section of the thread are d ₁ and d ₂ , respectively, Is represented by

Further, when the yarn is untwisted, even if it is flattened in this way, its shape easily returns to its original shape, and it is difficult to maintain the shape. Therefore, the yarn must be twisted at least 200 times per m.

To describe the details of the beating process, at least 15 reciprocating movements per second are required to effectively beat the yarn. The most convenient method is to use a commercial AC power supply through a solenoid coil to generate an intermittent magnetic force. With this method, the reciprocating motion is 100 times per second in eastern Japan and 60 hertz in western Japan. Can easily generate reciprocating movements of 120 times per second. To further increase the number of times of crushing, for example, an inverter may be used to generate an alternating current of a higher frequency and supply the alternating current to the solenoid coil. Alternatively, in addition to the reciprocating motion by such an electromagnet, various methods such as a rotating cam (10) intermittently pushing an arm (11) to move a hammer (8) up and down as shown in FIG. 9 are used. To be

Also, when the thread is crushed, the thread may fluff.
As shown in FIG. 10, the hammer (7) 'is not directly connected to the iron core (8) but is separated to form a separate member, and vibration of the iron core (8) is transmitted through the hammer (7)' so that fluffing and damage to the yarn are reduced. That is, when the thread is hit, the fluff may occur when the thread is touched or separated to hit the thread. As in this example, the hammer (7) '
This is because, if it is always placed (contacted) on the thread as a separate member and the hammer (7) 'is hit to change only the pressure for pushing the thread (1), the thread is pushed without damage.

Further, in order to effectively crush the thread, it is better to heat the thread and soften it and hit it, for example, by heating the pedestal (6) 'and hitting the thread (1) as shown in FIG. Or the 11th
It is advisable to preheat the yarn (1) using a heater (12) as shown in FIG. In addition, such heating is also effective in that a flattened yarn shape is set and the shape is maintained.

Further, as a means for flattening the yarn while twisting it little by little, it is also possible to use twisting the yarn to be supplied in advance and twist the surface little by little when it is beaten by the twisting torque. However, in order to do this more aggressively, for example, as shown in Fig. 12, this crushing device is attached to the up twister, and the thread (1) is pulled out while rotating at high speed with the spindle (13), and the thread is still rotated by this rotation. If it is hit with a hammer (7) and a pedestal (6) while doing, a twisted flat yarn can be made more effectively.

Here, regarding the relationship between the traveling speed of the yarn and the number of times of beating, the length of the beating surface (in the traveling direction of the yarn) is longer than the length of movement of the yarn during one beating motion. Then, there are parts that are repeatedly beaten, so the crushing effect increases. In order to expect a sufficient crushing effect, it is necessary to properly combine the three relationships of the moving speed of the thread, the number of crushing movements, and the length of the crushing member so that the same place is struck many times. is there.

As the material used in the present invention, any yarn can be applied, but thermoplastic synthetic fiber is more suitable because it is easy to stabilize the flat structure or easily deformed by crushing, and polyester having particularly good settability Is the best. In particular, polyester fibers having a low orientation, for example, a birefringence index of 0.11 or less, are very well crushed and deformed. Alternatively, when a yarn in which a fully stretched polyester yarn and a low orientation undrawn yarn are twisted together is crushed, the low orientation undrawn yarn is crushed and largely deformed, and the fully drawn yarn becomes a core and It can be applied in various ways, such as making it a very fancy thread to support.

(Effect of the Invention) Generally, as the yarn is twisted more strongly, light diffusely reflects and loses gloss. Conversely speaking, the stronger twisted yarn has a greater effect of flattening and recovering the gloss. For example, it is difficult to make a glossy woven or knitted fabric with a yarn subjected to a strong twist of 800 t / m or more, but the present invention is used. As a result, it is possible to obtain a cloth having a luster even with a strong twist and having a uniform appearance.

The present invention includes the following modes, as is clear from the above description.

(A) At least one side that crushes the yarn is positively heated.

(B) By interposing another member between the reciprocating surface and the yarn, and indirectly transmitting the reciprocating motion through the member to be crushed.

(C) In the twisting process, the yarn should be crushed at the moment when the torque is applied to the yarn.

(D) Reciprocating motion is performed by changing the magnetic force of a magnet passed through a commercial AC power supply.

(E) Reciprocating motion is performed by changing the magnetic force of a magnet passed through an AC power source generated by an inverter.

(F) To preheat the yarn and then feed and crush it on the facing surface.

(G) The length of the beating surface in the yarn length direction is longer than the moving distance of the yarn during one beating movement.

(H) A twisted yarn with a twisting number of 800 t / m or more.

(I) The yarn is polyester.

(J) A low orientation polyester having a birefringence index of 0.11 or less.

(Example) A thread of 1000 t / m was applied to a polyester thread of 75 De / 36 F having a triangular cross section, and this was applied by the method shown in FIG.
As shown in (6) 'of Fig. (A), a heater was put therein, heated to 160 ° C, and passed through while being crushed with a hammer (7). The solenoid coil (9) was energized with a commercial AC current of 100 V 60 Hz, and as a result, the hammer (7) repeatedly moved up and down 120 times per second. At this time, the traveling speed of the yarn (1) is 7.2 m / min, that is, 12 cm / sec, whereas the hammer (7) drops 120 times / sec.
The thread will advance 1 mm during one hammering motion.
On the other hand, since the dimension of the hammer (7) in the length direction of the thread was 8 mm, the thread was struck 8 mm / 1 mm = 8 times repeatedly at the same place while passing through the crushing movement of the hammer (7). Was flattened.

FIG. 13 is a micrograph showing the structure of the yarn flattened in this way. The major axis of the yarn is 0.16 mm, the minor axis is 0.09 mm, and therefore the flattening rate is Met. On the other hand, the yarn structure before flattening had a neat circular cross section as shown in FIG.

In addition, the flattened yarn in this way was initially twisted at 1000 t / m, but the twist of the yarn itself decreased to 980 t / m, and the flat surface was twisted 20 times per m. It was changed.

When a poplin-like woven fabric was woven using the yarns thus produced as a background, the woven fabric that had been subjected to such a strong twist had almost no gloss, while this woven fabric had a strong twist. The fabric has a strong luster and has never been seen before. Moreover, the woven fabric did not have warp or weft-like spots, and had a high commercial value in terms of uniform surface.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a conventional flattening process, FIG. 2 is a perspective view showing how light is reflected before and after flattening of a strongly twisted yarn, and FIG. 3 is a yarn breakage phenomenon in the conventional flattening process. FIG. 4 is a side view including a partial cross section showing an example of the process of the present invention, FIG. 5 is a side view showing the passing state of the yarn spots in the process, and FIG. 6 is a conventional view. Fig. 7 is a schematic view showing how to arrange the flattened yarns in the woven fabric, Fig. 7 is a side view showing the state of twisting of the yarns in the process of the present invention, and Fig. 8 is a flattened obtained by the present invention. Schematic diagrams showing how the threads are arranged in the woven fabric, FIG. 9 to FIG. 12 are other example embodiments of the process of the present invention, and FIG. 13 and FIG. It is an electron micrograph (200 times) showing an example of the form of a twisted yarn. In Fig. 4, (1) ... thread, (6) ... pedestal (stationary surface) (7) ... hammer (reciprocating surface).

Claims (2)

(57) [Claims] 1. A twisted yarn passes between a surface that reciprocates at least 15 times per second in a direction substantially perpendicular to the running direction of the yarn and a surface that faces the surface with the running yarn interposed therebetween. A method for producing a flat yarn, characterized in that the yarn is intermittently pressed and crushed between the both faces to flatten the cross section of the yarn at an oblateness of at least 30%. 2. A stationary plane and 15 per second in a direction substantially perpendicular to the plane.
A flattening device comprising a surface which reciprocates more than once and which is adapted to intermittently press and crush the yarn running between both surfaces.