JPS6218650B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved method for producing bulky yarns by feeding a plurality of filament yarns at different speeds to a suction-type fluid nozzle with loop-forming capability.

Hitherto, as means for imparting bulkiness to filament yarns, crimping methods such as false twisting, pressing, and rubbing are widely known. However, in recent years, people have grown tired of crimped yarns that retain the uniformity of filament yarns and have a slimy feel, and there has been a demand for natural-looking yarns with the random mottled appearance of natural fiber spun yarns. It's here. In response to these demands, various methods have been proposed to give filament yarns a spun yarn-like appearance and texture.In particular, a suction-type fluid nozzle with loop-forming ability is used to create loops by a disturbance action in a fluid turbulent region. It is attracting attention for its ability to add bulk to threads by giving them tangles and tangles.

However, since the loops of the bulky yarn obtained by this method are held by intertwining single fibers, an unwinding process from the yarn package is required between the process of processing the yarn and the fabrication. There has been a problem in that during the preparation process for weaving, the weaving and weaving process, etc., the fibers are subjected to various tensions, and the entanglements between single fibers tend to loosen, resulting in an extremely low bulkiness.

In addition, multiple threads are supplied approximately parallel to each other at different speeds to a suction-type fluid nozzle capable of forming loops, and a fluid agitation process is performed to cause the effect threads to protrude in a loop shape mainly around the thread forming the core. A method of producing bulky yarn using the same method has also been proposed. According to this method, the yarn fed at a low speed, that is, the yarn with a small overfeed rate, provides support, prevents the loop from unraveling, and has the advantage of stabilizing it. In a mold fluid nozzle, when multiple threads are fed approximately parallel to the thread entrance passage at different speeds, the threads come into contact with each other, and the threads interfere with each other in the thread entrance passage until they reach the fluid disturbance area. The running of the yarn with a high speed is hindered by the running of the yarn with a low feeding speed, resulting in instability, and the yarn is distributed unevenly in the longitudinal direction and clumps together. Compared to the loop yarn obtained by feeding, the yarn tends to have many irregularities, and it is not possible to maintain a sufficient difference in the feeding speed to prevent this, and the yarn has disadvantages such as being less bulky. Ta. In other words, with conventional processing techniques, it has not always been possible to obtain bulky yarn with sufficient bulkiness and loop entanglement strength.

The present inventor has arrived at the present invention as a result of studies aimed at solving the drawbacks of the prior art.

That is, in the present invention, when forming a bulky yarn by supplying a plurality of filament yarns substantially in parallel at different speeds to a suction-type fluid nozzle having a loop-forming ability, the yarns are mutually connected at least to the yarn of the suction-type fluid nozzle. This is a method for manufacturing bulky yarn, characterized in that there is no contact in a part of the entrance passage.

Note that the suction type fluid nozzle having the ability to form a loop refers to a suction type fluid nozzle that allows the flow of air or other compressible fluid from a restricted space, such as that seen in Japanese Patent Publication No. 34-8969 or Japanese Patent Publication No. 53-7543, etc. A suction-type fluid nozzle that rapidly ejects to create a fluid disturbance zone and feeds the yarn to be treated into this fluid stream to open it into individual filaments and impart loops and entanglements. The yarn inlet passage of the fluid nozzle is provided separately from the fluid injection hole, and the yarn supplied to the yarn inlet passage is of a type in which the yarn is fed to the fluid disturbance area by receiving suction force when the yarn runs. means a fluid nozzle.

The present invention will be explained in detail below.

The filament yarn used in the present invention includes:
Various types of yarns such as thermoplastic synthetic fibers such as polyester and polyamide, semi-synthetic fibers such as acetate, promics protein fibers, processed yarns thereof, and mixed yarns thereof can be used. Since the knotting strength of the yarn with the lowest yarn feeding speed due to its structure makes a large contribution to the strength of the resulting yarn, it is desirable to use a thermoplastic synthetic fiber with high strength. It is preferable that the filament yarn is substantially untwisted so that it can be easily entangled.

A plurality of such filament yarns are supplied to a suction-type fluid nozzle capable of forming loops at different speeds, and the yarns are not brought into contact with each other in at least a part of the yarn entrance passage when forming bulky yarns. is necessary. If multiple yarns with different yarn speeds are fed while being in contact with each other at least in a part of the yarn entrance passage, as described above, the yarns will interfere with each other, making the running of the yarn especially the one fed at a higher speed unstable. , a constant difference in feeding speed is not maintained in the longitudinal direction of the yarn, which tends to clump asymmetrically, resulting in yarn with many irregularities.In addition, the yarn fed on the high speed side becomes slack and wraps around the feed roller, resulting in poor operability. This is because it becomes significantly worse. By feeding the yarns without contacting each other at least in a part of the yarn entrance passage, for example, at the yarn entrance section, and then merging them together after getting sufficiently close to the fluid disturbance area, mutual interference between the yarns is reduced and the running of the yarn is stabilized. , uniform yarns with less unevenness can be obtained. When feeding multiple filament yarns at different speeds to a suction-type fluid nozzle with loop-forming ability, the feeding speed and speed difference are as follows. In order to improve entanglement with the bulky yarn, it is desirable that the bulky yarn be fed at a higher speed than the suction-type fluid nozzle, that is, overfeed, and particularly preferably 3 to 20% of the bulky yarn take-up speed. is 5~
It is fed at a speed of about 15% faster. The feeding speed of the feeding yarn on the highest speed side is 10 to 40 times higher than the feeding speed on the lowest speed side.
It is preferable to feed the yarn at a high speed in order to impart appropriate bulk to the yarn. If the speed difference is less than 10%, it becomes difficult to impart sufficient bulk to the yarn.
If it exceeds 40%, the loop formed becomes larger,
This not only significantly impairs the ease of unrolling from the packaging, but also increases the so-called Velcro effect, in which the fabric is stuck together by the loops on the fabric surface when it is made into fabric.
This is not preferable because it impairs the feeling of wearing it.

By the way, although there is a method in which the yarns are not brought into contact with each other in the yarn inlet passage according to the present invention, there is a method in which a separator is provided in the yarn inlet passage so that a plurality of yarns fed at different speeds are guided separately, or a fluid disturbance area is provided. The method of increasing the hole diameter of the thread entrance passage and providing a thread guide so that the threads do not come into contact with each other prevents oversupplied threads from coming into contact with each other. It is not possible. Among these, it is particularly effective to provide a plurality of yarn entrance passages according to the number of yarns supplied at different speeds, and this case will be described in detail based on an embodiment shown in the drawings.

FIG. 1 is a diagram showing the main parts of a suction-type fluid nozzle having a loop-forming ability. Reference numeral 1 is a needle portion disposed approximately in the center of the fluid nozzle, and the tip of the needle portion 1 is connected to a conical side surface 2. It further has a cylindrical portion 3 that is slightly thinner than the diameter near the center of the needle portion 1. A thread inlet passage 4 passes through the center of the needle part 1. Two thread introduction hole pipes 5 and 6 are inserted into the thread inlet passage 4, and a thread guide 7 is inserted into the thread inlet at the tip. It is provided. 15 is a partition plate. 8 is a constriction part of the yarn entrance passage 4;
The constriction part 8 is located slightly inside the tip of the needle part 1 and forms a recessed space 9. Fluid is supplied to the concave space 9 from a high-pressure fluid supply source (not shown), and the conical side surface 2 at the tip of the needle portion 1
The fluid is injected from the fluid injection hole 10 opened at the bottom of the conical side surface 2 at approximately the same angle as the conical side surface 2 at the tip of the needle portion 1, and has a conical shape on the bench lily side having approximately the same slope as the conical side surface 2 at the tip of the needle portion 1. A fluid disturbance space is formed by high-speed fluid blown almost straight into the minute gap with the side surface 11.

Note that the recessed space 9 of the yarn entrance passage 4 may not be cylindrical as shown in the figure, but may have a structure that expands toward the end. The conical side surface 11 is further connected to an outlet orifice 12 with a cylindrical opening. A plurality of filament yarns (not shown) supplied at different speeds in a suction-type fluid nozzle having a loop-forming ability as shown in the figure are introduced from a yarn guide 7 on the right side of the figure, and are introduced through mutually partitioned yarn introduction holes. pipes 5 and 6
It is guided to the left side through the inside of the tube and merges near the constriction section 8. At this time, a vortex is formed in the concave space 9 by the high-speed fluid injected from the fluid injection hole 10, and the two filament yarns exiting the constriction part 8 are instantaneously opened by this vortex, and are subjected to a disturbance effect. As a result, a loop or tangle is formed and is led out through the exit orifice 12 and the exit passage 13. Therefore, multiple yarns fed at different speeds do not interfere with each other in the process of reaching the fluid disturbance region, and the feeding speed is extremely stable even during high-speed processing, making it possible to create bulky yarns with uniform loops and entanglements. is obtained.

In addition, in the fluid nozzle structure as shown in FIG.
The yarn inlet passages, which are made into multiple numbers according to the number of yarns supplied at different speeds, do not need to be completely separated over the entire length from the yarn inlet to the vicinity of the constriction part 8 or to the fluid disturbance area, but at least It is desirable that at least 1/2 of the length from the yarn entrance section to the constriction section 8 is separated. Furthermore, when the yarn inlet passage is complicated, the arrangement of the yarn inlet passage with respect to the fluid injection hole and the direction in which the yarn is taken out from the fluid nozzle outlet have a subtle influence on the loop forming property. For example, Figure 2 A,
B and C are diagrams showing the positional relationship when two yarn introduction hole pipes are arranged in the yarn entrance passage 4, and arrow A
The position of indicates the position of the fluid injection hole, and the position of A indicates the case where the thread introduction hole pipes 5 and 6 are arranged vertically with respect to the fluid injection hole, which corresponds to the arrangement shown in FIG.

Figures B and C in the same figure show the case where they are arranged horizontally and at 45 degrees with respect to the fluid injection hole. FIG. 2D shows the yarn take-out direction B as an angle θ with respect to the fluid injection hole position A when the yarn is pulled out from the outlet guide 14 of the fluid nozzle in a plane perpendicular to the traveling direction. Position 5 of each pipe for yarn introduction hole,
6, 5', 6' and 5'', 6'' at different high and low speeds, and by varying the direction θ of taking it out from the fluid nozzle outlet, we investigated the loop formation property. The position of the pipe for use is as shown in FIG.
It was found that loop formation is best when the yarn is taken out at 0°, that is, in the direction of the position of the fluid injection hole.

The reason for this is not clear, but in the fluid disturbance region that contributes to the formation of loops and entanglements, higher-speed vortices are formed on the side closer to the fluid injection hole position, and on the side farther from the fluid injection hole position. Therefore, it is considered that the flow velocity gradient in the fluid disturbance region, which becomes a low-speed eddy flow, influences the positional relationship of the yarns fed at different speeds. On the other hand, the fluid injection hole 10 may be arranged parallel to the yarn entrance passage 4 instead of being inclined with respect to the yarn entrance passage 4 as shown in FIG.

The bulky yarn of the present invention can be manufactured by installing a suction type fluid nozzle capable of forming a loop as described above in a winder having a feed device and a delivery device capable of supplying a plurality of yarns at different speeds. When thermoplastic synthetic fibers are used, it is reasonable to attach the fluid nozzle to a drawing machine for drawing undrawn yarns, or to a drawing machine when false twisted yarns are used as loop yarns. Next, the fluid nozzle is attached to a machine equipped with a drawing device, and after drawing the undrawn thermoplastic synthetic fiber yarn, a fluid agitation treatment is performed using the fluid nozzle to obtain a bulky yarn.
This will be explained in detail based on the figures. In FIG. 3, yarns 22, 22' pulled out from a plurality of undrawn yarn packages 20, 21 are stretched at a predetermined drawing ratio between hot rollers 23, 23' and feed rollers 25, 25' at different speeds. Stretched. 24, 24' are hot plates for smooth stretching. The yarns 22, 22' drawn at different speeds and predetermined draw ratios are then supplied to a suction-type fluid nozzle 26 having a loop-forming ability, but the supplied yarns at different speeds almost contact each other in the yarn inlet passage. Not supplied.
Reference numeral 28 denotes a lubricator, which adds an appropriate amount of moisture to fluid, such as air, supplied from a high-pressure fluid supply source (not shown) in order to improve the loop and entanglement effects. The yarn is supplied from the fluid injection hole 10, and the supplied yarn is subjected to fluid agitation treatment to form loops and entanglements.

The bulky yarn 29 provided with loops and entanglements passes through a delivery roller 30 and is wound onto a package cage 32 by a winding roll 31. 16, 17, 18
and 19 are guides. 27 is a pipe.

In the present invention, since a plurality of threads are fed at different speeds to the suction type fluid nozzle capable of forming a loop without substantially touching each other, interference between the threads is eliminated, and the running of the threads is reduced. This makes it possible to obtain a bulky yarn that is stabilized and has uniform loops and entanglements in the longitudinal direction. Furthermore, according to the method of the present invention, the yarns fed at different speeds do not interfere with each other, so the feeding of each yarn fed at different speeds can be controlled independently. By supplying the yarn while changing the yarn speed periodically or non-periodically, there is an advantage that it is possible to produce fancy yarn having uneven thickness in the yarn longitudinal direction. Furthermore, the plurality of threads supplied to the suction type fluid nozzle at different speeds are not limited to threads of the same type, but may be arbitrary threads such as foreign material threads, threads with different dyeability, or combinations of threads with different cross-sectional shapes. A combination of yarns can be applied, and bulky yarns with a wide variety of textures and appearances can be manufactured.

Above, for convenience of explanation, we have specifically limited the number of yarns to two, but if more yarns are passed through the yarn entrance passage by changing the feeding speed so that they do not come in contact with each other, the number is equal to the number of yarns supplied. It is possible to provide several yarn inlet passages, but in some cases the difference in feeding speed may
There is no problem even if less than 10% of the threads are aligned and guided to the same thread entrance passage. Further, the thread may not be supplied to all of the plurality of thread entry passages, and there may be a thread entry passage in which the thread is not threaded.

Hereinafter, the present invention will be explained in detail with reference to Examples.

Example 1 Using the manufacturing process shown in Figure 3, undrawn polyester yarn (212 denier, 24 filaments)
Same as polyester undrawn yarn (213 denier 36
The filaments were drawn at different speeds and subsequently fed into a suction-type fluid nozzle with loop-forming ability to form bulky yarns.

The suction type fluid nozzle used had a structure in which the yarn inlet passage was divided by two introduction hole pipes as shown in FIG. 1, and the details of the manufacturing conditions were as follows.

Drawing conditions for undrawn polyester yarn (both) Drawing ratio...2.82 Hot roller temperature...85℃ Hot plate temperature...115℃ Supply speed of suction type nozzle 212 denier 24 filament side 440 m/min 213 denier 36 filament side 540 m/min min Speed at which the thread is taken up from the suction type nozzle
400m/min Air pressure supplied to suction type nozzle 6Kg/cm ² G Amount of water applied by lubricator (relative to air flow rate) 20c.c./Nm ^3Take -up overfeed ratio -1% Machining status under the above conditions Both the filament yarns fed at different speeds exhibited stable running conditions, and the operability was good. Furthermore, the obtained yarn was a bulky yarn with sufficient entanglement strength against tension and high bulkiness with uniform loops and entanglements in the longitudinal direction.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical cross-sectional view of a suction type fluid nozzle according to the present invention in which a plurality of yarn inlet passages are provided so that the yarns are not connected to each other when feeding a plurality of filament yarns, and FIG. B and C are diagrams showing the positional relationship when two yarn introduction holes are inserted into the yarn entrance passage, and D is the fluid injection when the yarn is pulled out from the suction type fluid nozzle outlet in a direction perpendicular to the direction of travel. It is a figure which shows the thread take-out direction with respect to a hole position. FIG. 3 is a schematic side view of an apparatus for manufacturing bulky yarn, in which a suction-type fluid nozzle having a loop-forming ability is attached to a machine having a drawing device. 1... Needle part, 5, 6... Pipe for thread introduction hole,
8... Throttle part, 12... Exit orifice, 21, 2
1'... Yarn package, 25, 25'... Feed roller, 26... Suction type fluid nozzle having loop forming ability, 30... Delivery roller.

Claims (1)

[Claims] 1. When supplying a plurality of filament yarns approximately parallel to each other at different speeds to a suction-type fluid nozzle having a loop-forming ability to form a bulky yarn, the yarns are connected to each other at least in a portion of the yarn entrance passage of the suction-type fluid nozzle. A method for producing bulky yarn, characterized in that no contact is made between the two.