JPS6115169B2 - - Google Patents

Description

[Detailed description of the invention]

In the present invention, polyethylene terephthalate polymers with different intrinsic viscosities [η]f are discharged independently, and they are joined at one point immediately behind the mouth surface.
Composite spinning is performed side-by-side using a separate composite spinneret that forms bi-side composite fibers, and after drawing and heat treatment, the fibers are directly connected and introduced into a high-temperature heating fluid push nozzle to develop crimp. At the same time,
Regarding the manufacturing method of non-torque crimped yarn, in which the developed crimps are heat-fixed, cooled, taken out from a nozzle, and wound, high-performance crimped yarn particularly suitable for clothing applications can be produced directly by spinning and at high speed. The aim is to provide a continuous processing method (so-called SDTY). Conventionally, the mainstream processing method for crimped yarn has been the so-called false twisting method, in which the drawn yarn is actually twisted, heated and set, then cooled and untwisted. With the advent of high-speed friction false twisting units, it became possible to run faster than previous spindle false twisting machines, and the so-called POY-DTY entered the processing speed range of 1000 m/mm. However, since this method is a mechanical processing method, there is a natural limit to its speed, and for example, there is almost no commercial benefit in continuous direct spinning. On the other hand, various methods have been proposed in which the drawn yarn is preheated and then subjected to heating = air processing (Special Publications Act 1973-
35175; USP 3729831; USP 3852857), although these methods are good in terms of speeding up, they are inferior in bulk as processed yarn used for clothing.
Furthermore, since the processing method is a method that causes the fibers to have an excessive heat shrinkage rate, the processed yarn has the drawbacks of uneven dyeing and poor mechanical properties (the yarn is easy to stretch). Therefore, the scope of these applications is carpet tufted yarn.
Currently, it is used in the method of manufacturing BCF. On the other hand, there is a method (Japanese Unexamined Patent Publication No. 2001-120100) of false twisting with a friction unit and then heat setting with an air forced nozzle.
53-119348; Japanese Patent Application Laid-open No. 54-68433), but these also cannot achieve processing speeds (2000 m/mm or more) suitable for direct spinning processing.
In addition, threading properties are complicated. Therefore, in accordance with the same concept as the present invention, in contrast to these methods, there is a method in which different types or different polymers are composite-spun during spinning, and heated air processing is performed after drawing heat treatment (USP 4115989; USP 4118534; Utility Model Publication No. 46-9535;
JP-A-45-37576; JP-A-54-42441) has been proposed. However, although these methods are suitable in terms of speed, the bulk and mechanical properties of crimped yarn are considerably lower than those of false twisted yarn, making them unsuitable for clothing applications. It is still not suitable. It is therefore an object of the present invention to eliminate such drawbacks and to
Processed yarn with high crimp performance suitable for clothing applications
Highly productive processing method (so-called SDTY) that allows continuous processing with direct spinning at speeds of over 2000m/mm
Our goal is to provide the following. The gist of the present invention is as follows: (1) A side film with a difference in intrinsic viscosity [η]f between the components.
When manufacturing by-side type composite polyester crimped fibers by direct spinning continuous processing, the aforementioned polyethylene terephthalate polymers with different intrinsic viscosities [η]f are separately discharged and joined at one point immediately after the spinneret. , side by
Using a separate type composite spinneret that forms side-type composite fibers, the intrinsic viscosity [η] f of the low [η] f side component is 0.33 to 0.45, and the difference in intrinsic viscosity △ [η] f between the components is 0.20 to 0.20. Side by side which is 0.30
Side-type composite fibers are melt-spun at a spinning speed of 500 to 1300 m/mm, directly connected, drawn, and heat treated to adjust the yarn elongation to a range of 13 to 23%, followed by crimp processing using a heated fluid forcing nozzle. A method for producing a non-torque crimped yarn is characterized by the following. The present invention will be explained in more detail. side by
The method described above (USP4115989;
USP4118534; Actual Publication Showa 46-9535; Special Publication Showa 45-
37576; Japanese Patent Application Laid-open No. 54-42441), these methods cannot produce high-quality processed yarn suitable for clothing applications. The inventors of the present invention have conducted extensive studies, and as a result, have arrived at the present invention. First, the words and symbols used in the present invention will be explained here. (a) Intrinsic viscosity [η] f is the intrinsic viscosity measured with a free-hole (free-falling) filament, and free-hole filaments are used under side-by-side composite spinning conditions, with one side of the polymer stopped and the other side It is measured from a free hole filament spun with only polymer. In this case, [η]f is determined by the following equation. [(ηrel) is the ratio of the viscosity of a dilute solution of polyester in a mixture of 60% phenol and 40% carbon tetrachloride to the viscosity of the solvent mixture measured at the same temperature and in the same units, and C is 100 c.c. .The number of grams of polyester in the mixture. ] (B) △[η] f] High [η] f - Low [η] f (C) The elongation after drawing heat treatment refers to the elongation of the composite spun yarn from 80 to
After stretching at a predetermined stretching ratio at 95℃, the film is stretched to 140 to 220 degrees using a hot roller or hot plate instead.
This refers to the elongation at break of a filament that has been subjected to tension heat treatment at ℃ and then wound. The elongation at break is the elongation at the break point when a sample length of 20 cm is pulled at a tensile rate of 100%/min, and the test is expressed as the average of 5 tests. The first important thing in the present invention is that, as a side-by-side composite spinneret, polymers with different intrinsic viscosities [η]f are discharged independently, and the separation is performed by joining them at one point immediately behind the spinneret surface. The reason is that a type composite spinneret, for example, a spinneret as shown in FIG. 1 is employed. Merging polymers with different intrinsic viscosities [η]f in the nozzle, which has been studied in the past,
In a spinneret that is bonded together for composite spinning, such as the one shown in Figure 2, △[η]f
If the value is increased, the mechanical interaction of both components within the spindle causes the spun yarn to bend significantly and adhere to the spindle surface, a so-called kneeling phenomenon, which often makes stable spinning impossible. . Therefore △ [η]
It is difficult to stably obtain a composite spun yarn with excellent bulkiness because f cannot be made large. On this point, in a separate type composite spinneret as shown in Figure 1, the two components within the spinneret do not undergo mechanical interaction, which prevents knealing and produces a composite spun yarn with excellent bulk. High △ required to obtain
Stable spinning is possible even under [η] f conditions,
The effect is extremely large in direct spinning continuous processing. In addition, to explain a little about FIG. 1 and FIG. 2, both are partial vertical side views showing an example of a spinneret. In the case of Fig. 1, the high viscosity component A and the low viscosity component B are separately provided at the introduction holes 2, 3 and the discharge holes 4, 5.
At that time, each of the discharge holes 4 and 5 is equally inclined with respect to the perpendicular to the mouthpiece surface 6, and the mouthpiece surface is aligned so that the extension lines of both discharge holes intersect at a point immediately after the mouthpiece surface 6. 6 at appropriate intervals, the high viscosity component A and low viscosity component B can be joined at one point immediately behind the mouthpiece surface 6 after exiting the respective discharge holes 4 and 5. . On the other hand, in the case of Fig. 2, the high viscosity component A and the low viscosity component B are introduced into the introduction holes 2 and 3 individually, and are combined and bonded together in the mouthpiece 1 and discharged from the discharge hole 4. 3 has a smaller hole diameter than the introduction hole 2 and is bored so as to intersect with the introduction hole 2, so the high viscosity component A and the low viscosity component B are merged and bonded together in the mouthpiece and are discharged from the discharge hole 4. be done. Secondly, it is important that [η]f on the low [η]f side is 0.33 to 0.45. If this [η] f is smaller than 0.33, the yarn will break during melt spinning and the spinneret surface will become dirty, making spinning impossible. On the other hand, if it exceeds 0.45, spinnability will improve, but [η]f becomes too high, and sufficient molecular orientation and heat treatment cannot be performed at high speed (200 m/mm or more) in the next stretching heat treatment step. Therefore, strength and bulk suitable for clothing cannot be obtained. Thirdly, it is necessary that Δ[η]f be between 0.20 and 0.30. If this Δ[η]f is less than 0.20, it will not be possible to provide sufficient latent crimp performance and it will not be possible to obtain a highly crimped yarn suitable for clothing. Moreover, if it exceeds 0.30, a sufficiently highly oriented drawn yarn cannot be obtained at high speed, and as a result, a highly crimped yarn cannot be obtained. Furthermore, if such a spun yarn is made to have a high degree of orientation, the yarn will break frequently at high speeds, which will greatly impair productivity. Fourthly, it is important that the yarn elongation after drawing heat treatment is 13 to 23%. This is because if the elongation exceeds 23% before entering the next air-pushing nozzle, the orientation on the high [η]f side is not sufficiently raised, so high-temperature heated gas (or heated steam) is heated in the air-pushing nozzle. ), when crimp occurs, thermal stress is insufficient and the degree of crimp does not increase. On the other hand, when stretched to an elongation of less than 13%, the stretchability is poor at 2000 m/mm or more, and a lot of fuzz lapping occurs, which poses operational problems. Fifth, the spinning speed is preferably in the range of 500 to 1300 m/mm. Regarding the relationship between the spinning speed and the crimp performance of the composite spun yarn, as [η]f increases, the spinning speed at which the crimp ratio reaches the maximum value shifts to a lower speed side. On the other hand, high [η] f
When [η]f on the side becomes lower, the spinning speed at which the crimp ratio reaches the highest value shifts to a higher speed side, and the level of the crimp ratio becomes lower. However, satisfying the range of [η]f and the range of △[η]f on the low [η]f side,
Furthermore, yarn spun at a spinning speed of 500 to 1300 m/mm can result in highly crimped processed yarn. This spinning speed is 500
If it is less than m/mm, not only will the crimp performance deteriorate, but the processing speed will also decrease, and there will be no merit in terms of high-speed processing. On the other hand, spun yarn exceeding 1300 m/mm not only does not become a highly crimped yarn, but also has a large decrease in strength and is not suitable for high-speed processing. As described above, the present invention provides a non-torque crimping method that can stably produce processed yarn with high crimping performance suitable for clothing use under high efficiency. The present invention will be described below with reference to Examples. In the present invention, TC, which represents the crimp rate, was measured by the following measuring method. TC = ₀ - ₁ / ₀ × 100 (%) ₀ is treated in boiling water for 20 minutes with a load of 2 mg per de, and after drying in this state at below 40 ° C for 1 day and night.
This is the length after 1 minute after applying a load of 200 mg per de. ₁ is the length after ₁ minute after applying a load of 2 mg per DE 3 minutes after 0 measurement. Example In this example, yarn was spun using the spinneret shown in Figure 1, and the yarn output was controlled so that the final processed yarn was 48 filaments of 145 to 170 deniers. After knitting and dyeing, the texture, sink marks, and spots were visually judged. These results are shown in Table-1. In this example, the weight ratio of the low [η] f-side component and the high [η] f-side component was adjusted to 50%:50% for spinning.

[Table] In Table 1, Nos. 1 and 2 are studies of the spinneret structure, and No. 1 is an example using the separate type composite spinneret shown in Fig. 1, which does not cause any kneeling phenomenon. Stable spinning was possible. On the other hand, in No. 2 using the conventional type nozzle shown in FIG. 2, knealing occurred, the spun yarn adhered to the nozzle surface, and spinning could not be performed. No. 3 to 6 are side-by-side low [η] f
This is a study of [η] f on the side, and No. 3
If this [η] f is as low as 0.30, spinning cannot be performed. Also, if this [η] f is too high, such as 0.50, sufficient stretching cannot be achieved as in No. 6,
Also, since the heat treatment effect was low, only products with low TC could be produced, and the "sink" and spots were not very good either. No. 7 to 12 are △ between side-by-side components
Considering [η]f, No. 7 shows that △[η]f
Since it is low at 0.18, the TC is low and the texture is poor. No.8 to 11 with △[η]f of 0.23 to 0.30
The TC is high and the texture is good, and Nos. 9 to 11 are particularly satisfactory as crimped yarns for clothing. Furthermore, when Δ[η]f was as large as 0.32, as in No. 12, thread breakage occurred frequently. Nos. 13 to 16 are studies of yarn elongation after drawing, but in No. 13, which has a low elongation of 10%, fluff and
Wraps occur frequently, and the processed yarn contains a large amount of fuzz. Also, when the elongation exceeded 23%, the TC became low as in No. 16, and the "sink" dyeing was not very good. Nos. 17 to 21 are studies on spinning speed,
If the spinning speed is less than 500 m/mm, the TC will decrease slightly, but the processing speed will be low and the benefits of high-speed processing will not be realized. On the other hand, No. 21, which is high at 1500m/mm, not only has low strength but also low TC and poor texture. As is clear from the above examples, when the separable composite spinneret of the present invention is used, the low [η] f is 0.33 to
0.45, spinning speed 500~1300m/mm, elongation after stretching 13~
If the 23% condition is satisfied, it is possible to continuously process high-performance crimped yarn suitable for clothing applications directly and at high speed.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional side view showing a separate type composite spinneret used in the present invention, and FIG. 2 is a longitudinal sectional side view showing a conventional composite spinneret. A... High viscosity polymer component, B... Low viscosity polymer component, 1... Mouthpiece body, 2, 3... Introduction hole, 4, 5...
Discharge hole, 6... mouthpiece surface.

Claims (1)

[Claims] 1. A side film with a difference in intrinsic viscosity [η]f between the components.
When manufacturing by-side type composite polyester crimped fibers by direct spinning continuous processing, the aforementioned polyethylene terephthalate polymers with different intrinsic viscosities [η]f are individually discharged and joined at one point immediately behind the spinneret surface. However, using a separate type composite spinneret that forms side-by-side type composite fibers, the low [η] f is 0.33 to 0.45, and the difference in intrinsic viscosity △ [η] f between the components is 0.20 to 0.30. side by
Side-type composite fibers are melt-spun at a spinning speed of 500 to 1300 m/mm, directly connected, drawn, and heat-treated to achieve a yarn elongation of 13
A method for producing a non-torque crimped yarn, which comprises adjusting the yarn to a range of ~23%, and subsequently crimping it using a heated fluid pushing nozzle.