JPH028052B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a spunlike yarn and a method for producing the same.

Filament yarn can be produced in fewer steps than spun yarn, so it has the advantage of being more productive, but on the other hand, the yarn surface is smooth and does not have the bulkiness of spun yarn. Therefore, it has the disadvantage of lacking diversity.
For this reason, various techniques have been proposed for giving spun-like bulkiness to the filament yarn by crimping it, but most of these techniques involve so-called morphological bulkiness, in which the tension is applied in the longitudinal direction of the yarn. It was an unstable substance that easily lost its bulk when added to it.

In view of the above-mentioned problems, the object of the present invention is to
It is an object of the present invention to provide a spun-like yarn having a so-called structural bulk that is stable against tension and has a spun-like texture and appearance, and a method for producing the same.

In the spunlike yarn of the present invention that achieves the above object, the filaments constituting the multifilament form protruding fibers and are intertwined with each other.
and the multifilament has alternating twists in the longitudinal direction and is bundled to form a constituent unit yarn, and is a spun-like yarn consisting of a plurality of the constituent unit yarns, which are also twisted alternately in the plying direction. The spunlike yarn forms a twist, and the spunlike yarn is
It is characterized by a substantially reversible change in alternating twist in which the alternating twist of the ply twist decreases in a tensioned state, but increases in the alternating twist of the ply twist in a relaxed state.

In addition, a method for producing a spunlike yarn that achieves the above object involves treating a multifilament in a relaxed state in a turbulent gas, so that each filament of the multifilament has protruding fibers and is a bulky yarn that is intertwined with each other. The method is characterized in that the bulky yarns are formed into a yarn, alternately twisted, and then aligned and self-twisted.

In the present invention, the structural unit thread is composed of a multifilament, and is preferably composed of a thermoplastic polymer such as polyester or polyamide.
Each of the filaments constituting the multifilament forms protruding fibers that are partially composed of loops, sag, and/or snarls, and the filaments are formed so as to be intertwined with each other. Moreover, in such a configuration, the entire multifilament is bundled with alternating S twists and Z twists applied periodically or randomly along its longitudinal direction. Naturally, a non-twisted portion may exist between the alternate twists.

This multifilament may be composed only of filaments made of the same material and having the same properties, or may be composed of a mixture of filaments made of different materials or having different properties. That is,
In the latter case, it may be a mixed fiber yarn consisting of a combination of different polymers, or a combination of different heat shrinkage, strength, elongation, dyeing, fineness, cross-sectional shape, etc. Furthermore, the filament may be subjected to false twisting or other crimp processing, and the filament may be non-uniform in the longitudinal direction.

Two or more constituent unit yarns having the above-mentioned configuration are aligned and self-twisted to equalize uneven turning properties in the longitudinal direction of the yarn due to alternating twist torque of each constituent unit yarn. is,
Convergence is imparted by forming a ply twist. In terms of productivity, it is most preferable to use two constituent unit yarns, that is, double yarns. In a typical self-twisted condensed part, the twist (first twist) of the constituent unit yarn is S twist, and the twist becomes Z twist, and the part where the twist (first twist) of the constituent unit yarn is Z twist. S-twist ply twists are formed, and the ply-twist portions thereof are arranged periodically or randomly along the longitudinal direction of the yarn. In such self-twisting, the filaments constituting each constituent yarn are not entangled in any meaningful way with each other and are independent of each other.

The spunlike yarn configured as described above has a bulky form that is stable against tension in the longitudinal direction. When tension is applied to this spun-like yarn, the multiple constituent unit yarns appear to change in the direction of separation from each other, but when the tension is released, the spun-like yarn returns to its original state with stable bulk. Return to article. That is, when tension is applied, the protruding fibers on the surface of the constituent yarn act to prevent the alternate twist from untwisting, and when the tension is released, the yarn self-twists again and returns to its original state. , it has a reversibly stable focusing property against tension.

FIG. 1 shows a spunlike yarn according to an embodiment of the present invention in a relaxed state with no tension applied (FIG. 1A) and in a tensioned state with tension applied (FIG. 1B). are shown respectively.

In a state where no tension is applied, the spunlike yarn 1 has a constituent unit yarn 2, as shown in FIG. 1A.
a, 2b are alternately and randomly arranged in the longitudinal direction with S-twisted ply-twisted portions 3 and Z-twisted ply-twisted portions 4 with non-twisted portions 5 interposed therebetween. In the S twist part 3, the first twist of the constituent unit yarns 2a, 2b is Z twist, and in the Z twist part 4, the first twist of the constituent unit yarns 2a, 2b is S twist.
It is twisted. Here, the constituent unit threads 2a, 2b
The multifilament constituting the multifilament has a large number of protruding fibers 6 such as loops, snarls, and snarls protruding outward, and each filament is intertwined with each other.

On the other hand, when tension is applied, the constituent unit yarns 2a and 2b appear to be separated, as shown in FIG. It acts to prevent untwisting. Therefore, even when tension is applied, the alternating twists imparted to the constituent yarns hardly disappear, and when the tension is released, the state as shown in FIG. 1A is restored. Therefore, the spunlike yarn has stable cohesiveness that is reversible against tension.

Therefore, even if tension is repeatedly applied and released, the spun-like yarn 1 maintains a stable spun-like feel and appearance, and can form a preferable fabric.

FIG. 2 schematically shows the steps for manufacturing the spunlike yarn of the present invention described above.

In FIG. 2, a and b are multifilaments that serve as raw materials, and each multifilament a and b is fed in a largely relaxed state between the first rollers 10a and 10b and the second rollers 11a and 11b. , compressed air injection disturbance nozzles 12a, 12b
Disturbance processing is performed at Due to this disturbance treatment, the constituent filaments of each of the multifilaments a and b become entangled with each other, and a large number of protruding fibers such as loops, sag, and snarls are formed in a part of the filaments. The multifilament in which the filaments are intertwined with each other to form protruding fibers is then transferred to the second rollers 11a, 11b and the third roller.
Between it and the roller 13, it is processed by compressed air injection false twisting nozzles 14a and 14b under a slightly tensioned condition to impart alternate twists. Compressed air injection false twisting nozzle 14
In a and 14b, the S twist is applied to the upstream side, and compressed air is intermittently supplied to both nozzles at the same time. Therefore, upon exiting the compressed air injection false twisting nozzles 14a, 14b,
The multifilaments a and b become the alternatingly twisted constituent unit yarns 2a and 2b described above, and when both the constituent unit yarns are pulled together by the third roller 13 and relaxed behind them, both become self-twisted. The spun-like yarn of the present invention is formed by

As the above-mentioned compressed air jetting disturbance nozzle and compressed air jetting false twisting nozzle, known ones can be effectively applied. Furthermore, the false twisting direction of the false twisting nozzle and the timing of compressed air supply are not limited to the above.

As mentioned above, the spunlike yarn of the present invention is
Each filament constituting the multifilament forms protruding fibers and is intertwined with each other, and the multifilament is bundled with alternating twists along the longitudinal direction to form a constituent unit thread, and the constituent unit thread is It is a spun-like yarn consisting of a plurality of strands, which forms an alternating twist even as a ply twist, and the spun-like yarn reduces the alternating twist of the ply twist in a tensioned state, but in a relaxed state. Then, since the structure exhibits a substantially reversible alternating twist change that increases the alternating twist of the first twist, it exhibits a span-like texture and appearance that is bulky and stable against tension, even though it is bulky and is made of filaments. It becomes possible to do so. In addition, since it is a spunlike yarn composed of filaments, unlike spun yarn from staples, there is no pilling or loose yarn, and it can maintain a new look for a long period of time. Further, such excellent spunlike yarn can be efficiently produced by the above-mentioned production method according to the present invention.

Example 1 Two yarns of polyethylene terephthalate multifilaments a and b of 30 denier and 16 filaments were prepared, and a spunlike alternately twisted twin yarn was produced using the apparatus shown in FIG.

In the apparatus shown in FIG. 2, the first rollers 10a, 1
0b, second rollers 11a, 11b, third roller 1
The surface speed of 3 is 250m/min, 200m/min, respectively.
Set at 205 m/min, pressurized air injection disturbance nozzle 12a,
The compressed air pressure of 12b is set to 4Kg/cm ² G, and the compressed air injection false twisting nozzles 14a and 14b are set to a compressed air pressure of 4Kg/cm ² G.
The S twist was introduced on the upstream side, and compressed air was intermittently supplied to both nozzles at the same time at 0.4 second intervals.

The produced spun-like alternately twisted double yarn has a good spun-like texture and appearance, and even when tension is applied, it returns to its original spun-like bulk when the tension is released, and has stable structural bulk. was.

Example 2 As the raw material multifilaments a and b, a mixed yarn consisting of a polyethylene terephthalate multifilament of 30 denier and 12 filaments and a polyethylene terephthalate multifilament of 50 denier and 36 filaments was used, and the above embodiment was carried out using the apparatus shown in Fig. 2. A spunlike alternately twisted twin yarn was produced under the same conditions as in Example 1.

As in the case of Example 1, the produced spun-like alternately twisted double yarn exhibited a good spun-like texture and appearance, and even when tension was applied, it returned to its original spun-like bulk when the tension was released. However, it had stable structural bulk.

[Brief explanation of drawings]

1A and 1B respectively show spunlike yarns according to the present invention, FIG. 1A is a side view in a relaxed state, FIG. 1B is a side view when tension is applied, and FIG. 2 is a spunlike yarn according to the present invention. FIG. 2 is a schematic diagram of the process of manufacturing spunlike yarn. DESCRIPTION OF SYMBOLS 1... Spunlike yarn, 2a, 2b... Constituent unit yarn, 3... S twist part, 4... Z twist part, 6... Protruding fiber, 12a, 12b... Compressed air injection disturbance nozzle,
14a, 14b... Compressed air injection false twisting nozzle.

Claims (1)

[Claims] 1. Each filament constituting the multifilament forms protruding fibers and is intertwined with each other,
and the multifilament has alternating twists in the longitudinal direction and is bundled to form a constituent unit yarn, and is a spun-like yarn consisting of a plurality of the constituent unit yarns, which are also twisted alternately in the plying direction. The spunlike yarn forms a twist, and the spunlike yarn is
A spunlike yarn characterized by exhibiting a substantially reversible change in alternating twist in which the alternating twist of the ply twist decreases in a tensioned state, but increases in the alternating twist of the ply twist in a relaxed state. 2. By treating the multifilament in a relaxed state in a turbulent gas, each filament of the multifilament is formed into a bulky yarn having protruding fibers and intertwined with each other, and after imparting alternating twist to the bulky yarn, A method for producing spunlike yarn, which comprises aligning a plurality of bulky yarns and self-twisting them.