JPH0232374B2 - SUTOTSUKINGUYOKAKOITONOSEIZOHOHO - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for producing processed yarn for stockings with excellent transparency by doubling, friction twisting, and splitting. Many varieties have been produced as processed yarn for stockings. Some of these types include processed yarns with excellent transparency that are produced for women's stockings, and depending on the processing method, these processed yarns can be divided into torque type yarns (non-crimpable torque yarns) and kennel processed yarns. It is broadly divided into (In addition, with woolly processed yarn,
Processed yarn with excellent transparency has not been obtained. ) However, this torque type yarn has the disadvantage that it has poor fitting properties and is prone to cross-row unevenness. On the other hand, conventional kennel-processed yarn has the disadvantages of a poor knitting surface, which tends to cause stitch inversion unevenness and misalignment because the yarn torque is higher than that of ordinary woolly yarn, and the disadvantage of easily causing wrinkles. The disadvantage was that the texture of the stitches changed when the stitches changed. In order to improve this drawback of conventional kennel yarn,
Many improvements to the kennel processing method have been proposed.
Publication No. 46-20110, etc.). However, these improvements have only resulted in the addition of friction twisters to the twisting area during twisting and false twisting for auxiliary twisting and yarn feeding, and essentially the properties of the kennel processed yarn have not been improved. The current situation is that this has not been done. Therefore, the main object of the present invention is to provide a method for producing a textured yarn which has improved the above-described disadvantages of the textured kennel yarn and has excellent transparency. In other words, the object of the present invention is to produce processed yarn for stockings that has a good knitting surface, excellent transparency, and fitting properties, and is less likely to cause twitching, cross-stacking, fastening properties, loose stitches, or dropped stitches, and can be produced uniformly and with high productivity. The object of the present invention is to provide a method that allows production with stable operation. In order to achieve this object, the present invention uses a multifilament yarn having a total fineness of 7 to 20 deniers after pre-burning and having a single yarn count of 3 or less.
A plurality of yarns are supplied with a twist of 0.7 to 15 t/m, and the yarns are twisted together, and after being false-twisted and heat-set using a circumscribed friction twister having a feeding action, the circumscribed friction twister is The process consists of dividing the untwisted and plied yarn that has come out of the twister into multiple multifilament yarns, taking them off, and then winding them up. The main features of the method of the present invention are that after the multifilament yarns are combined, they are false twisted and heat-set using a circumscribed friction twister with a feeding function, and further,
After coming out of this friction twister, the thread is separated and taken off. As a result, it is virtually no longer necessary to wind the yarn using the yarn tension at the time of splitting, which is the case with the conventional method of improving kennel textured yarn. Therefore, it is possible to stably process the textured yarn at low tension and high speed. can be produced. In addition, there is no need to twist the strands several thousand to 10,000 times before processing, and when starting processing,
As with normal wool processing, the first reverse twist that occurs is simply discarded without being rolled up. Furthermore, according to the method of the present invention, restrictions on the number of false twists and yarn tension (which are disadvantages of the kennel processing method) are eliminated, so the disadvantages of kennel processing yarns can be overcome, and the transparency This makes it possible to produce excellent processed yarn. The multifilament yarn (supplied yarn) supplied for false twisting in the method of the present invention needs to have a total fineness of 7 to 20 deniers after false twisting. If the stocking is less than 7 denier, the strength of the stocking will be insufficient and the feeling of wearing will be poor, making it unsuitable. On the other hand, 20
If it is larger than the denier, the stockings will have poor transparency, be rough and hard, and have a thick base, making them uncomfortable to wear, so they are not suitable. Further, in order to obtain excellent transparency and wearing comfort, it is preferable that the denier is 16 denier or less. The number of single yarns needs to be 3 or less filaments, that is, 2 to 3 filaments. Monofilament is difficult to crimp and becomes coarse and hard, making it unsuitable. Moreover, if there are four or more filaments, the transparency of the stocking will be reduced and the crimped form and stitch form will resemble woolly yarn, so it is not suitable. Further, 2 to 3 filaments are preferably carried out on the yarn dividing work surface at the start of false twisting. When supplying such raw yarn, 0.7~
It is necessary to apply a twist of 15t/m.
If it is less than 0.7 t/m, it will be difficult to divide the yarn running at high speed at the start of false twisting without causing misplacement of single yarns into the original plural yarns, which is not suitable. On the other hand, if it is larger than 15 t/m, it is not suitable because it lowers the productivity of the supplied raw yarn and further gives unnecessary cohesiveness to the final processed yarn. As for multiple yarns that are fed at the same time and double-twisted, if the number of yarns is too large, the crimped coil will become coarse, the knitting surface and fit properties will deteriorate, and the winding machine space will become too large, making it difficult to install the equipment. Since there is also a problem in terms of productivity, it is preferable to limit the number to four or less. In addition, especially as the raw yarn supplied to the present invention,
Intermediately oriented nylon 6 or nylon drawn at a high speed of 3800 m/min or higher with an elongation of 50 to 75%
66 fibers are preferred. When carrying out the method of the present invention by using such an intermediately oriented yarn as the supplied raw yarn, stability and high speed during processing can be easily achieved.
Furthermore, the resulting processed yarn is made more uniform, the crimps are finer,
This results in a low torque and is suitably implemented. Intermediately oriented yarns obtained at a speed of less than 3800 m/min are inferior in uniformity and color fastness of processed yarns. Furthermore, if the elongation is less than 50%, the stability during processing will decrease and it will be difficult to make the crimp finer. Furthermore, if the elongation exceeds 75%, it is not preferable because the dyeing fastness of the resulting processed yarn will be reduced. In addition, nylon 6 and nylon 66 have appropriate Young's modulus and wet reversibility, so they have excellent stretchability, recovery properties, and texture for stockings, and also have good color development, making them ideal as materials for women's stockings. Generally, such raw yarn can be obtained by changing the spinning speed and the stretching during spinning. When supplying multiple multifilament yarns like this, doubling, false twisting, and later splitting them, the key is how to easily divide them into the original multifilament yarns and stably process the split yarns. It is at the point of
In order to do this, it is necessary to divide the plurality of supplied multifilament yarns until they leave the supply roller and enter the twisting zone, and after piling the yarns in the twisting zone, heat-fix them and untwist them. By taking such a measure, each multifilament yarn immediately before the yarn is subjected to a proper amount of false twist as a convergent twist, and the single yarns of each multifilament yarn after the yarn are twisted as a group, and each Migration due to twisting of single yarns between multifilament yarn groups is reduced, and subsequent yarn division is facilitated. The twister used in the method of the present invention must be a circumscribed friction twister because of its stable processing at high speeds (500 m/min to 1500 m/min) and ease of thread threading and thread separation. It is necessary to use a circumscribed friction twister that has a feeding function to optimize the dividing thread tension. For the above-mentioned reason, as the external twister, in addition to the 3-axis disk twister, the 2-axis "F-" manufactured by Toshiba Machine Co., Ltd.
5" twister etc. can be used. Next, the processing conditions in the processing method of the present invention are as follows: A K value of 15,000 or more is preferable from the quality of the stockings obtained, and if the K value exceeds 30,000, the migration of single yarns between each multifilament during twisting becomes excessive, making it difficult to split threads and reducing processing stability. Therefore, it is preferable to set the K value to 30,000 or less.Furthermore, considering the product texture and surface quality, the K value should be 17,000 or less.
A range of ˜27,000 is preferably implemented. Tension during processing is 0.3 to 0.8 g/d as twisting tension
(relative to the doubling denier) is preferable (the untwisting tension is a value measured by pulling all the split yarns together). When using a twister with a large circumscribed three-axis feed action, a processing tension ratio of 1.1 to 2.5 is suitable. Even when a twister with a large feeding action is used, if the tension ratio is less than 1.1, the untwisted state becomes unstable and alternating twists remain, which makes the split yarn unstable, which is not preferable. In addition, when using a twister with a relatively small feed effect, such as a circumscribed two-axis twister, the machining tension ratio is
It is suitable to take about 1.8 to 2.8. In carrying out the present invention, it is particularly preferable to use a circumscribed three-axis disk twister from the viewpoint of freedom in selecting processing tension and twisting level. The heat setting temperature during false twisting depends on the stability of the split threads,
In terms of stocking product quality, low temperatures are particularly preferred, with nylon 6 at 130-165℃ and nylon 66 at 130-165℃.
The temperature is preferably 140 to 190°C, and preferably 150 to 190°C for polytetramethylene terephthalate. Next, an embodiment of the present invention will be described according to FIG. The supplied raw yarn coming out of the supplied yarn package 1, 1' is supplied to the false twisting area via the supply roller 2, the two yarns are doubled by the yarn doubling guide 3, and then the circumscribed friction twister 5 A false twist is inserted at the rear of the yarn, heated by a heater 4, cooled and heat-set, untwisted by a circumscribed friction twister 5, and separated by a yarn dividing guide 6. The yarn is then separated by a take-up roller 7. The product is taken up, re-lubricated with the re-oil roller 8, and wound onto a winding package 9. FIG. 2 is an enlarged view showing the twisted state of the yarns at _the doubling section in FIG _.
are separated by a doubling guide 3 so that a light _converging twist is inserted by _the twisting torque in the twisting region Since the twisted yarn enters the twisting area X, it becomes easy to separate the yarn at the untwisting area. Figure 3 shows the thread splitting section (twister~) in Figure 1.
FIG. 3 is an enlarged view showing the twisted state of the yarn at the yarn splitter guide section), in which the untwisted yarn exits the twister disks 10, 10' and returns to its original plurality between the twister exit guide 11 and the yarn divider guide 6. The yarn is divided into processed yarns Y ₂ and Y ₂ ′. Example 1 Nylon 6 was spun at a take-up speed of 4100 m/min,
An intermediately oriented multifilament yarn consisting of three filaments was obtained. The elongation of this yarn at maximum strength was 63%. This yarn is twisted with a twist of approximately 2t/m.
After main feeding, the yarns were doubled after coming out from the supply roller, and after false twisting, heat fixing and untwisting, the yarns were split between a twister and a take-off roller, taken up, and wound into packages. The denier of each yarn after false twisting was adjusted to 15 denier. The false twisting conditions are processing speed 600m/min,
The processing feed rate was -21%, the twisting tension was 120 g/strand, the untwisting tension was 21.5 g/strand, the heater temperature was 165°C, and a circumscribed three-axis friction disk was used as the twister. The twister disk was composed of five metal surface disks, and the heater was a 2.5 m contact heater.
The number of false twists actually measured was 3850t/m. As for the yarn doubling method, two yarns are doubled in front of the supply roller, and two yarns are doubled at the exit from the supply roller, but the splitting workability at the start at the untwisting section and the stability of the splitting during processing are improved. Table 1 shows that the results are shown in Table 1, and in all cases, the yarns formed by doubling at the exit from the supply roller were superior.

[Table] S twist of processed yarn obtained by No. 2 in Table 1,
Two strands of each Z-twist were used and knitted on a Nagata "Super 4" knitting machine to create women's stockings. The obtained product had excellent transparency and texture, and had improved defects such as sagging, twitching, and change in texture compared to conventional kennel-type yarns. Example 2 Obtained by spinning and stretching at 600 to 700 m/min,
2 to 4 filaments with a total fineness of 15 denier, approx.
Using 12 t/m twisted nylon 66 yarn as the raw yarn, false twisting was performed in the same manner as No. 2 of Example 1, and stockings were finished and evaluated.

【table】

[Table] If the number of filaments in the supplied yarn is too large (No.
5, 8, 11, 14, 17), the transparency of the stocking was poor, and the thread splitting workability, thread splitting stability, and processing stability were also poor. Example 3 Spinning speed 4500 m/min, elongation 60%, 2 filaments with a fineness of 15 denier after false twisting, approximately 2 tons/min
As an intermediately oriented yarn with a twist of m, the heater temperature is 165
The same false twisting process as in Example 1 was carried out at ℃, but the processing speed was changed.

[Table] According to the method of the present invention, product stockings could be stably processed even when false-twisting was performed at a much higher speed than the conventional method, and had good transparency and a knitted surface. Example 4 The same yarn as in Example 3 was used, the number of yarns was 3, the processing speed was 600 m/min, and the actual number of false twists was 3720 t/min.
False twisting was performed at m. The yarn splitting workability and processing stability at the start were good, and the obtained product stockings had good transparency and a knitted surface. Example 5 When an intermediately oriented yarn consisting of 3 filaments of nylon 6 spun at a take-up speed of 4100 m/min was spun into two yarns and false twisted at 500 m/min, the number of twists of each yarn supplied was changed. The results of the start yarn separation test are shown in Table 4.

[Table] Shown as the rate of non-injury.
In this way, in the case of the present invention method (No. 23, 24)
In this case, the success rate of thread separation was high, but in the comparative example (No. 22), thread separation often failed at the start. According to the method of the present invention, processed yarn for stockings with excellent transparency can be stably produced at low tension and high speed, and the obtained processed yarn has improved the disadvantages of kennel processed yarn. It is possible to produce product stockings that have excellent knitted surfaces, transparency, and fit properties, and are resistant to twitching, horizontal fastening properties, loose stitches, and dropped stitches.

[Brief explanation of drawings]

FIG. 1 is a side view showing one embodiment of the method of the present invention. 2 is an enlarged view showing an outline of the thread doubling section in FIG. 1, and FIG. 3 is an enlarged view showing an outline of the thread dividing part in FIG. 1. Explanation of symbols, 1, 1': supply yarn package;
2: Supply roller, 3: Doubling guide, 4: Heater,
5: Circumscribed friction twister, 6: Thread dividing guide, 7: Take-up roller, 8: Adding oil roller, 9: Take-up package cage, 10, 10': Twister disc,
X: twisted area, Y ₁ , Y ₁ ′: supplied yarn, Y ₂ , Y ₂ ′: processed yarn.

Claims (1)

[Scope of Claims] 1. Supply of a plurality of multifilament yarns having a total fineness of 7 to 20 deniers after false twisting and having a single yarn count of 3 or less, with a twist of 0.7 to 15 t/m. After applying false twist to the yarn using a circumscribed friction twister having a feeding action and heat-setting it, the untwisted and plied yarns exiting the circumscribed friction twister are returned to the original plurality. A method for producing processed yarn for stockings, which comprises dividing the yarn into multifilament yarns, taking them off, and then winding them. 2. The multifilament yarn supplied to the false twisting process is characterized by being composed of intermediately oriented nylon 6 or nylon 66 fibers with an elongation of 50 to 75%, drawn at a high speed of 3800 m/min or more. , a method for producing processed yarn for stockings according to claim 1. 3. The processing for stockings according to claim 1, characterized in that the multifilament yarns supplied for false twisting are combined after leaving the supply roller and before reaching the heater. How to make yarn. 4. The method for producing processed yarn for stockings according to claim 1, wherein the circumscribed friction twister is a three-axis or two-axis disk twister.