JPH028053B2 - - 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.

The spunlike yarn of the present invention that achieves the above object is composed of a multifilament having false twisted crimps, a part of which forms protruding fibers, and the multifilament has longitudinal crimps. It is a spunlike yarn consisting of a plurality of constituent unit yarns that are bundled so as to have alternating twists along the direction to form constituent unit yarns, and it also forms alternating twists even as a ply twist. , and the spunlike yarn is 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. be.

In addition, the method for manufacturing spunlike yarn that achieves the above purpose is to falsely twist a multifilament to make a curled yarn, give alternating twists to the false twisted curled yarn, and then twist the multiple filaments. The feature is that the curled yarns are 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.
The multifilament is a false-twisted yarn that is crimped by false-twisting, and has loops and sag on its surface due to the false-twisted crimping.
Moreover, in this form of false twisting and crimping, the entire multifilament has S along its longitudinal direction.
Alternating twists of twist and Z twist are randomly applied and bundled. Naturally, a non-twisted portion may exist between the alternate twists.

The 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 non-uniform in the longitudinal direction.

Two or more constituent unit yarns having the above-mentioned configuration are aligned and self-twisted to equalize the uneven turning properties in the longitudinal direction of the yarn due to the torque of alternate twisting of each constituent unit yarn. , forming a ply twist to impart convergence. In terms of productivity, it is most preferable to use two constituent unit yarns, that is, double yarns. In a curved self-twisted condensed part, the twist (first twist) of the constituent unit yarn is S twist, and the second twist is Z twist, and the second twist (first twist) of the constituent unit yarn is Z twist. A ply-twisted S twist is formed in the portions, and these ply-twisted portions are periodically or randomly arranged 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, protruding fibers such as loops and snarls caused by false twisting and crimping of the constituent yarns act to prevent the untwisting of the alternate twist, and therefore, when the tension is released, the thread returns to its original state. Therefore, 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 that constitutes the fiber has many protruding fibers such as loops and snarls due to crimping during temporary processing. In this state where no tension is applied, the spun-like yarn 1 has a stable spun-like texture and appearance.

On the other hand, when tension is applied, as shown in FIG. The fibers act to prevent the untwisting of adjacent constituent yarns. Therefore, even if tension is applied, the alternating twists imparted to the constituent yarns do not disappear, and when the tension is released, they self-twist again and return to the state shown in FIG. 1A. Therefore, the spunlike yarn has stable cohesiveness that is reversible against tension.

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, respectively, and each multifilament a and b is inserted into the false twisting device 13 between the first rollers 10a and 10b and the second rollers 11a and 11b.
While being twisted by the heaters 12a and 13b,
The twist is set by 12b and false twisting is applied. Next, the multifilaments a, b are moved to the second rollers 11a, 11b and the third rollers 14a, 14a, 14b.
4b, and the loops and snarls caused by the false twist curling appear here. The multifilament in which protruding fibers such as loops and snarls have emerged is then moved to the third roller 14a,
Between the roller 14b and the fourth roller 15, the fabric is processed by compressed air injection false twisting nozzles 16a and 16b under a slightly tensioned condition to impart alternate twists. The compressed air injection false twisting nozzles 16a and 16b are arranged so that the S twist enters the upstream side, and compressed air is intermittently supplied to both nozzles at the same time. Therefore, when exiting the compressed air injection false twisting nozzles 16a, 16b, the multifilaments a, b become the constituent unit yarns 2a, 2b to which the above-mentioned alternating twists have been applied,
Next, when both constituent unit yarns are pulled together and relaxed behind the fourth roller 15, they are self-twisted and formed into the spunlike yarn of the present invention.

Any known false twisting device or false twisting nozzle described above can be effectively applied. Furthermore, in the case of false twisting for alternate twisting, the direction of false twisting and the timing of compressed air supply are not limited to the above.

As mentioned above, the spunlike yarn of the present invention is
Consisting of a multifilament having false twisted crimps, some of the crimps forming protruding fibers, and the multifilaments are bundled to have alternating twists along the longitudinal direction. It forms a unit yarn, and is a spun-like yarn consisting of a plurality of constituent unit yarns, which forms an alternate twist even when twisted. The structure exhibits a nearly reversible change in alternating twist, which decreases the alternating twist of the twist, but increases the alternating twist of the first twist when it is in a relaxed state. It becomes possible to exhibit a stable span-like texture and appearance. In addition, since it is a spunlike yarn composed of filaments, it can maintain a new appearance for a long period of time without pilling or loose threads, unlike yarn spun from staples.
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 50 denier and 24 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
4a, 14b, and the surface speed of the fourth roller 15 are respectively 205 m/min, 200 m/min, 100 m/min, and 170 m/min.
The number of false twists is set in the false twisting devices 13a and 13b.
The temperature of heaters 12a and 12b is increased at 1500 times/m.
155°C, and pressurized air injection false twisting nozzles 16a, 1
6b had a compressed air pressure of 4 kg/cm ² G so that the S twist entered the upstream side, and compressed air was intermittently supplied to both nozzles at the same time at intervals of 0.4 seconds.

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 Raw material multifilaments a and b were undrawn polyethylene terephthalate multifilaments of 120 denier and 36 filaments (natural drawing ratio
1.55), a spun-like alternately twisted twin yarn was produced using the apparatus shown in Figure 2. In the device shown in Figure 2, the first
The surface speed of rollers 10a and 10b is 125 m/min,
The procedure was the same as in Example 1 except that the temperature of heaters 12a and 12b was set at 210°C.

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. 1... Spunlike yarn, 2a, 2b... Constituent unit yarn, 3... S twist part, 4... Z twist part, 12a, 1
2b... Heater, 13a, 13b... False twisting device,
16a, 16b... Compressed air injection false twisting nozzle.

Claims (1)

[Scope of Claims] 1. Consisting of a multifilament having crimps that have been subjected to a false twisting process, and a portion of the crimps forming protruding fibers, and the multifilament is twisted alternately along the longitudinal direction. The spun-like yarn is bundled to form a constituent unit yarn, and is a spun-like yarn consisting of a plurality of the constituent unit yarns, which forms an alternating twist even as a ply twist, and the spun-like yarn A spunlike yarn characterized in that the yarn exhibits 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 After false twisting the multifilament to make a curled yarn, and applying alternating twists to this false twisted curled yarn,
A method for producing spunlike yarn characterized by aligning a plurality of false twisted curled yarns and self-twisting them. 3. The method for producing spunlike yarn according to claim 2, wherein a relaxation treatment is performed between the false twisting process and the alternating twisting process.