JPS6332893B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a special false-twisted yarn that can form a fabric that exhibits a texture similar to real twisted yarn and a light Kasuri pattern. More specifically, S-twisted yarn portions and Z-twisted yarn portions alternate in the yarn axis direction, and the yarn portion in one of the twisting directions has a tightly twisted yarn structure, and the yarn portion in the other twisting direction has a bulky yarn structure. The invention relates to a special false-twisted yarn with a twisted yarn structure. The present invention seeks to create a tight yarn structure in the so-called untwisted portion, where the twisted yarn structure of the yarn in the twisted area of the false twisting process remains in the yarn after the false twisting process, and in the twisted area of the false twisting process. This requires a bulky twisted yarn structure in the so-called over-untwisted portion, which is the untwisting of the yarn beyond a certain twist density.
Obtaining a real twist-like effect on the yarn in an alternately twisted state formed by the untwisted portion and the overtwisted portion,
The purpose is to find the effect of Kasuri on the difference in form between the untwisted part and the over-twisted part. Many techniques are known in the art for alternately forming untwisted portions and over-untwisted portions by false twisting. For example, Special Publication No. 50-25065, Special Publication No. 51-
No. 225, Japanese Patent Publication No. 51-42662, etc., using a spindle-type false twisting device to draw polyester-based drawn fibers or polyamide-based drawn fibers, there is an extremely high possibility that the fibers will partially fuse to each other. An example is described in which false twisting is performed at a heating temperature. However, with the above-mentioned conventional techniques, it has been impossible to obtain a fabric capable of forming a fabric that exhibits the texture of real twisted yarn and a light Kasuri pattern, which is the objective of the present invention. The reason for this is thought to be as follows. First, in order to obtain the texture of real twisted yarn,
It is important to increase the twist density of both the untwisted part and the over-untwisted part, which means that the untwisted part has a high twist density and a large proportion of the length of the yarn. It is. However, in the false twisting process, increasing the twist density of the yarn in the twisted region has the undesirable characteristic of reducing the occurrence of untwisted portions. On the other hand, increasing the heating temperature and increasing the fusion between fibers will increase the occurrence of untwisted parts, and although this is a positive thing, increasing the fusion between the fibers will also increase the number of untwisted yarns. This will inhibit the original effects of being soft, drapey, or having a high ability to develop grain. In other words, the melting point makes the yarn more similar to a monofilament yarn and makes the yarn more rigid. Secondly, the only way to obtain a pale Kasumi is to rely on the difference in yarn structure between the untwisted part and the over-twisted part.
Of course, since both are composed of the same fibers, fineness, and number of fibers, there must be a fairly clear difference in form. For this purpose, it is important to increase the tightness of the untwisted portion and to increase the bulkiness of the over-untwisted portion. The tightness of the untwisted portion only needs to maintain the twisted structure of the yarn in the twisted region of the false twisting process, that is, as long as the crimp of the fibers is not exposed, and the twist density has little effect. However, the bulkiness of the over-untwisted portion is better as the crimp of the fibers is higher, and it is necessary that the fiber has been subjected to a higher degree of false twisting. However, the untwisted portion and the over-untwisted portion undergo the same false twisting, and in order to increase the bulkiness of the over-untwisted portion, it is necessary to give a high degree of false twisting to the ununtwisted portion as well. In this case, as described above, on the one hand, the occurrence of untwisted portions is reduced. On the other hand, increasing the number of fibers fused together maintains the tightness of the untwisted portions, but this is not preferable because it impairs the bulkiness of the overly twisted portions. This is because it prevents the crimp from being exposed in the over-twisted portion. Thirdly, when it comes to Kasuri, its pattern is important and is closely related to the length, number, and amount of untwisted parts. If there is not much fusion between the fibers, the length, number, and amount of the untwisted portions are insufficient to create a Kasuri pattern. Fourth, to achieve this goal, the yarn needs high tensile strength. This is because it would be completely meaningless if the untwisted portions and over-untwisted portions formed in the yarn were to be destroyed as the twists were offset in the process of receiving tension during the process from yarn to fabric. be. If there is not much fusion between the fibers, the tensile strength is generally insufficient. As mentioned above, one of the reasons why the methods described in the three publications mentioned above cannot achieve the object of the present invention in terms of the texture of the actual twisted yarn, the clarity of the kasuri pattern, the pattern of the kasuri pattern, and the tensile strength of the yarn is that This is because the technical scope was limited to a method of false-twisting drawn yarn using a spindle-type false-twisting device. In other words, spindle-type false twisting is performed by winding the yarn around thin pegs, which creates a large strain on the yarn passing through the pegs, inhibiting the generation of untwisted parts, and lowering the tensile strength of the untwisted parts that occur. shall be taken as a thing. Furthermore, in the false twisting process of drawn yarn, it is possible to clearly distinguish between the heating temperature range where fibers fuse together and the heating temperature range where no melting occurs. There was an appropriate amount of fusion that did not significantly impede the bulkiness of the twisted part, and there was fusion that occurred, but in the over-untwisted part, the fusion was so mild that it peeled off due to the strain of untwisting. This is because the temperature range in which intermediate fusion occurs is extremely narrow, and it is difficult to use that temperature range. Also, JP-A-51-143746, JP-A-51-143746,
Publication No. 143749, Publication No. 53-15188, Publication No. 15188, Publication No. 15188, Special Publication No.
53-30818, JP-A-51-19847, JP-A-53-98444, etc., the drawn fibers are false-twisted using a false-twisting device that applies fluid swirling flow under high excess supply. Examples of implementation are described. However, even with the above-mentioned conventional techniques, the object of the present invention could not be obtained. Especially in the Kasuri pattern, the length of the untwisted part is too short. The reason why the untwisted part cannot be made longer in the false twisting method using fluid swirl flow is that when the yarn undergoes false twisting,
The thread revolves on the fluid swirl flow (ballooning)
be affected. This revolution action also induces ballooning of the yarn in the untwisted region. The rotation of the yarn forced by the fluid swirl flow does not match the natural frequency of the yarn in the untwisting region, which is determined by the yarn and its tension, and the yarn is subjected to intermittent forces and untwisted. It is considered that the twisted portion is torn. This phenomenon is further aggravated when the excess supply amount is large and the yarn tension is low, and when the excess supply amount is small and the yarn tension is high, false twisting with a high twist density cannot be imparted at all. On the other hand, as a technique for forming a long untwisted portion, there is a technique of applying an active unsteady action to the yarn that is being subjected to the false twisting process. For example, as a technique for changing the contact state between the yarn and the heating device,
Publication No. 66928, Japanese Patent Application Laid-open No. 15017-1977, Japanese Patent Application Publication No. 1977-15017
-8119 Publication, Japanese Patent Publication No. 51-34016 as a technology for varying the twist propagating from the false twisting device toward the heating device
No. 49-554, Japanese Patent Application Laid-open No. 1973-
Japanese Patent Publication No. 121546, Japanese Patent Publication No. 1984-8414, Japanese Patent Application Laid-open No. 108353-1973, and Japanese Patent Application Laid-open No. 1983-61745 as a technique for varying the number of twists of yarn generated by a false twisting device.
JP-A-49-92337, JP-A-Sho 49-92337 as a technique for varying the speed of yarn passing through a false twisting device.
No. 49-92354, JP-A-52-66722, JP-A-53-81749, and JP-A-Sho. 49 as a technique for making yarns subjected to false twisting uneven in the length direction.
Publication No. 101654 is known. The common characteristics of the above-mentioned unsteady false twisting are that the number of twists changes gently along the yarn axis, and that staining irregularities, thickness irregularities, etc. are formed. If the number of twists changes gradually, the pattern of the Kasuri becomes unclear, and irregularities in dyeability and thickness have a strong visual impact, so it is difficult to create a light Kasuri effect that is intended to be expressed by the twisted structure of the yarn. inhibit. Furthermore, the technique of JP-A-49-133647 has also been proposed, but since this technique involves additionally twisting the false-twisted yarn with the actual twist, a tightly twisted yarn portion is not formed, and the twisted yarn portion in the opposite direction is A bulky twisted yarn portion with twist is also not formed. Furthermore, this technique has the disadvantage that production efficiency is poor because additional twisting is applied to the actual twisting. Since there is a large gap between the purpose of the present invention as described above and the conventional techniques as described above, in the process of completing the present invention, while referring to these conventional techniques, The present inventors have conducted extensive research on the equipment, processing conditions, the resulting yarn, and the fabrics using the yarn. As a result, in order to achieve the objectives of the present invention,
Compared to the yarn obtained by the above-mentioned conventional technique, the yarn does not have staining unevenness in the yarn axis direction, has minimal fusion between fibers, and has a higher twist density in the untwisted portion. We have reached the conclusion that it is necessary to increase the proportion of length in the yarn, increase the length of each individual yarn, and further increase the tensile strength of the yarn. The inventors have also found that the technical means described below is superior to the conventional techniques with respect to the yarn manufacturing technology for achieving the above-mentioned objects of the present invention. First, it is most important not to form staining spots in the yarn axis direction, and this means performing the false twisting process in a steady state. Second, to minimize the fusion between fibers, in addition to selecting the false twisting processing conditions, undrawn fibers that have a wide temperature range that causes intermediate fusion are used as raw yarn, and the undrawn fibers are The degree of molecular orientation is selected as necessary. Thirdly, as the false twisting device, a friction false twisting device is used which can reduce strain other than twisting applied to the yarn and can prevent ballooning from occurring to the yarn. The present invention has succeeded in achieving the object as a result of further intensive research regarding the above technical means,
We have now provided this technology. The gist of the present invention is as follows. That is, the present invention provides a multifilament yarn consisting of long fibers having false twist crimp, the yarn having a twist density of 21000/(number of twists/m) or more along the yarn axis direction,
and a tightly twisted yarn portion in which the crimped form of the fibers matches the twisted structure of the yarn, and a bulky twisted yarn portion having a twist in the opposite direction to the tightly twisted yarn portion and in which the crimped form of the fibers is exposed. are present alternately at irregular lengths, and the length ratio of the tightly twisted yarn portion to the entire yarn is
10% or more, and furthermore, the sum of squares of each length (unit: mm) of the tightly twisted yarn portion is 3000 or more per meter of yarn (however, D is the denier number of the yarn). In the present invention, preferably the tensile strength of the yarn is 0.3 g/
D or above, and furthermore, the yarn is characterized by having substantially no stainable spots in the yarn axis direction, and furthermore, the fibers constituting the yarn are fused to each other. This is a special false-twisted processed yarn characterized in that either there is no fiber, or even if the fiber is fused, the fusion is such that it can be peeled off without cutting the fibers. The "tightly twisted yarn portion" mentioned above is a yarn portion in which the twist density is 21000/√ (number of twists/m) or more and the crimp form of the fibers matches the twisted structure of the yarn. In other words, it is a yarn portion that is like a non-crimped multifilament yarn twisted and heat-set. The above-mentioned "bulky twisted yarn portion" refers to a yarn portion that is twisted and in which the crimped form of the fibers is exposed. In other words, the yarn portion is like a twisted multifilament yarn that is untwisted and has crimps. In the above, "yarn having alternating tightly twisted yarn portions and bulky twisted yarn portions" refers to a state in which the yarn does not substantially have any yarn portion that does not correspond to either the tightly twisted yarn portion or the bulky twisted yarn portion. It is the thread of However, strictly speaking, there is a non-twisted yarn part that does not belong to either of the two yarn parts at the boundary between the tightly twisted yarn part and the bulky twisted yarn part, but the non-twisted yarn part does not have a meaningful length. In fact, there is nothing larger than 1mm. "D" in the above is the denier number of the yarn. In the above, "tensile strength of 0.3 g/D or more" means
When the yarn is subjected to tension running treatment at a tension of 0.3 g/D and a yarn speed of 200 m/min, even a small amount of the tightly twisted yarn portion remains, preferably 10% or more in terms of length ratio to the yarn. It is to remain. The present invention will be explained in more detail. As mentioned above, the ultimate objective of the present invention is to obtain a fabric that exhibits a texture similar to that of real twisted yarn and a light splashed pattern, and the direct objective of the present invention is to obtain a raw thread of the fabric. The higher the twist density of the untwisted portion is, the more preferable it is for the texture effect similar to real twisted yarn, and the upper limit to which the twist density of the untwisted portion can be increased is determined depending on the embodiment. The tightness of the untwisted portion is perfect, with the twisted yarn structure of the yarn in the twisted region of the false twisting process remaining intact. However, in spindle-type false twisting, when strong fusion is not occurring, the twist density of the untwisted portion is much lower than the twist density of the yarn in the twisted region of false twisting, and this difference is due to untwisting. The action of untwisting partially destroys the structure of the untwisted parts, creating cracks in the twisted wires and impairing their tightness. This tendency is stronger when the twist density of the yarn in the twisted region of the false twisting process is higher, and becomes more noticeable when the twist density is 21000/√ (number of twists/m) or more. On the other hand, the bulkiness of the over-untwisted portion is higher when the twist density of the yarn in the twisted region of the false twisting process is higher, and when it exceeds 21000/√ (number of twists/m), the crimping of the fibers that contributes to bulkiness increases. will be obtained. It is also an interesting phenomenon that the twist densities of the two cases are the same. According to the method for obtaining yarn of the present invention, the twist density of the yarn in the twisted region of the false twisting process can be left almost unchanged in the untwisted part, and by the false twisting process with a high twist density, a high We were able to obtain a yarn with an untwisted part with a high twist density, and we were able to obtain a fabric using this yarn. In order for the Kasuri pattern on the fabric to become clear, the twist density in the twisted area of the false twisting process must be 21000/√ (number of twists/m) or higher. In the yarn of the present invention in which untwisted portions are partially present in the length direction of the false twisted yarn, the presence of the untwisted portions must be in an amount sufficient to fully exhibit the effect. First, regarding the texture of a real twisted yarn, as the amount of untwisted portions increases, the twist density of overly twisted portions also increases, which tends to increase the effect of twisting. On the other hand, when twisting is added to the false twisted yarn and the relationship between twist density and texture is investigated, the effect of twisting is felt when the twist density exceeds the range of 2300/√ to 2400/√ (number of twists/m). Become. In addition, various types of false twisted yarns containing untwisted portions were made as prototypes, and further twisting was applied to adjust the twist density of the over-twisted portions to 2300/√ to 2400/√ (number of twists/m). When comparing the amount and effect of untwisted parts, it was found that when the amount of untwisted parts exceeds 10%, its presence can be felt by touch. If there is 10% or more of the untwisted part with a twist density of 21000/√ (number of twists/m) or more, the twist density of the over-twisted part is in the range of 2300/√ to 2400/√ (number of twists/m). It exceeds. Next is the relationship between the Kasuri pattern and the amount of untwisted parts, which has a close relationship with the length of the untwisted parts and is also related to people's preferences, but in general What can be said is that if the amount of untwisted parts is small, there will be only scattered thin lines in the fabric, but if the amount of untwisted parts exceeds 10%, the probability that untwisted parts will be adjacent to each other increases, The lines become wider and the pattern appears more clearly. Strictly speaking, the length and amount of the untwisted part are related to the Kasuri pattern. For example, if the length of the untwisted portion is about 5 mm, even if the length is increased, it will only show spots and will not give a Kasuri pattern. The length of the untwisted part is 10
When the size is about mm, the pattern becomes somewhat longer, and when the amount is extremely large (more than 30%), it begins to take on a kasuri pattern. Also, the length of the untwisted part is 40
When it is about 2 mm, it is about 2 pieces per meter of thread (the amount is 8
%), the appearance of kasuri appears. Combining various experiments, the sum of squares of the length (mm) of the untwisted portion is 1
If it exceeds 3,000 per meter, it will be recognized as having a Kasuri pattern. Table 1 shows the results of examining and testing the relationship between the sum of squares of the length (mm) of the untwisted portion (tightly twisted yarn portion) per meter of yarn and the effect of producing a good Kasuri pattern. I will explain using The test results shown in Table 1 were obtained by using the same undrawn multifilament yarn and equipment as those described in the examples below, and by variously changing the twist density, heating temperature, stretching ratio, etc. of false twisting. We created various processed yarns (nine types) with different length ratios and average lengths of the tightly twisted yarn structure to the whole yarn, and used the processed yarns as the wefts of textiles to create a Kasuri pattern. These are the results of a sensory evaluation. In addition, polyester multifilament yarn (50 denier, 36 filaments) is used for the warp, and the warp density is 110 threads/inch.
The weft density was 85 threads/inch. In the same table, in the evaluation column, the mark ◯ indicates ``those with a good kasuri pattern appearance effect'', and the cross mark indicates ``the kasuri pattern appearance does not appear well''.

[Table] As can be seen from the results in Table 1, the above-mentioned sum of squares value is 3000 or more (thread numbers 6, 8, 9)
All of them show a good Kasuri pattern appearance effect. To explain the point where such an effect can be obtained using a more specific example, for example, even if the average length is the same, that is, for example,
Even if we assume that threads have the same average length of 20 mm, there are actually a variety of threads, for example, threads that are all 20 mm long. Although it can show the striped pattern effect, it cannot show the effect of a good kasuri pattern, and on the other hand, the average length is 20 mm, but most of it is about 5 mm, and sometimes it is about 5 mm long. Such threads can produce a good Kasuri effect. Thus, a long tightly twisted yarn section (50 in the example above)
mm) runs as long stripes, so even a small number of them can play a major role in producing a good Kasuri pattern effect. On the other hand, unless there are a very large number of short pieces, and unless they are concentrated in a certain area, they cannot produce a good Kasuri pattern. , the first condition required is that there be a large number of short ones. In the end, long patterns are a prominent and effective element for the appearance of Kasuri patterns, and even if it is not just long patterns, long patterns can be appropriately mixed among short patterns to create an average effect. Even if the value is low, as long as it is long, the effect can be high. Therefore, in investigating the relationship between the length of the tightly twisted yarn portion and the effect of Kasuri pattern appearance, it is effective to give weight to the presence of long yarns. The present inventors have obtained this knowledge. Here, as the means, using a sum of squares value that multiplies certain length data by that length data and totals those values,
As mentioned above, it was possible to quantify the weight by giving weight to the length, and it was also found to be consistent with the Kasuri pattern appearance effect.
It has been found that this is the most suitable factor for quantification, and as shown in Table 1 and as specified in the present invention, if the value of the sum of squares is 3000 or more, it is considered to be a good factor. It is possible to show the appearance effect of Kasuri pattern. The tensile strength of a yarn is related to the deformation of the yarn during the process of manufacturing fabric from the yarn. In order to prevent yarn deformation, it is preferable that the yarn has high tensile strength, and it is also desirable to pass through the process with low tension. But 0.3
Passing through the process with a thread tension of less than g/D means
A tensile strength of at least 0.3 g/D is necessary because it impedes workability and the quality of the resulting fabric. When used with increased tensile strength by twisting or applying glue, the original yarn is not limited to this. In order to obtain the special false twisted yarn of the present invention, the first important requirement is to feed the undrawn yarn as a supply yarn to a friction false twisting device and to perform false twisting during stretching in a steady state. The stretching ratio is set to a low stretching ratio that is lower than the natural stretching ratio of the undrawn yarn, and the friction false twisting device is not particularly limited to an internal type or a circumscribed type, but it has a sufficient yarn feeding function as well as a twisting function. The stretch and false twist is applied in such a way that substantially no ballooning occurs. In addition, the number of false twists is
21000/√ (number of twists/m) to a value that is slightly smaller than the false twisting value used to obtain normal false twisted crimped yarn called Wooly yarn, and The higher the temperature, the more effective it is, but it is necessary to avoid a temperature that would cause the degree of fusion to such a degree that if the fibers are fused together, they cannot be separated unless the fused fibers are cut. According to the findings of the present inventors, the temperature is generally 210 to 240 for polyethylene terephthalate fiber.
The optimum temperature range is approximately 175 to 190°C for polyamide fibers and nylon 6 fibers. Of course, it is possible to obtain the special false-twisted yarn of the present invention outside of this range, and it is preferable to set the value according to the supplied yarn, desired textured yarn, other processing conditions, etc. as appropriate. Furthermore, in the present invention, since it is possible to produce by a false twisting method, it has the remarkable effect that it can be produced at high speed and with good production efficiency, and that it is possible to obtain a processed yarn at low cost. Example Melt spinning polyethylene terephthalate,
The yarn was drawn at a speed of 3000 m/min to obtain an undrawn multifilament yarn with a thickness of 126D and 36 filaments. The natural draw ratio of the undrawn yarn was 1.62. While this yarn was stretched by 1.4 times, false twisting was applied to that region, and a part of the false twisting region was heated with a hot plate heated to 225°C. The false twisting method uses a circumscribed friction false twisting device and is as described in Japanese Patent Application Laid-Open No. 50-69343. When the twist density of false twisting was set in the range of 1800 to 3200 (number of twists/m), untwisted portions were generated in all cases, and the twist density was almost equal to that of false twisting. Katta. That is, this yarn has an untwisted portion of a tightly twisted yarn structure in which the crimp form of the fibers matches the twist structure of the yarn, and a twist in the opposite direction to the tightly twisted yarn structure portion, and the fibers are twisted in the opposite direction. It had over-untwisted parts of a bulky yarn structure in which the crimped form was exposed, alternating with irregular length parts, and almost no untwisted yarn structure parts other than these two structures were observed. . The obtained yarn is approximately 90D (denier), and this yarn is used for the weft (85 pieces/inch), and polyester multifilament yarn 50D-24fil (135 pieces/inch) is used for the warp.
A plain weave was used for evaluation. Comparing the twist density of the untwisted part and the Kasuri fabric, it is 2000.
(number of twists/m), the Kasuri pattern is unclear, and 2400 (number of twists/m).
In case m), the kasuri pattern was clear. At the middle level of 2200 (number of twists/m), clarity seemed to be somewhat insufficient. From these results, it can be seen that the effect of Kasuri is large when the twist density of the untwisted portion is 21000/√(number of twists/m) or more. In the above, the yarn of the present invention having a twist density of 2400 (number of twists/m) in the untwisted portion has a twist density of 2400 (number of twists/m) in the untwisted part.
This was obtained by setting the number of twists to 2430 (number of twists/m). In addition, when we investigated the structure of this yarn in more detail, we found that the ratio of the length of the tightly twisted yarn to the entire yarn was
17%, and the length of each part (mm
The sum of squares of the number) was 3400 per meter of thread. In addition, this yarn does not show any deformation due to tension that would cause any particular inconvenience during the fabric manufacturing process, and furthermore, in the sensory evaluation of the fabric, the yarn showed clear unevenness in dyeability in the yarn axis direction. The existence of fusion and adhesion was not recognized. In addition, the twist density of the untwisted part and the twist density of the over-untwisted part are calculated by taking appropriate lengths of the untwisted part and over-untwisting part, measuring the number of twists of each, and calculating the twist density of the untwisted part and the over-untwisted part. This is converted into the number of twists. Comparative Example Using the same undrawn yarn as in the example,
Air false twisting was performed using a method similar to that described in Publication No. 98444. The air false twisting nozzle had a yarn passing hole with a diameter of 2 mm and six air injection holes with a diameter of 0.4 mm in the tangential direction of the cross section of the yarn passing hole, and supplied compressed air with a gauge pressure of 3.5 Kg/cm ² . . The conditions and results are shown in Table 1.

[Table] As is clear from the results in Table 1, in Experiment Nos. 1 to 5, the higher the heating temperature, the more untwisted parts are formed. The sum of the squares of the lengths (mm) was far from over 3000. It is thought that strong ballooning occurs before and after the air false twisting nozzle, preventing the formation of long untwisted layers. In addition, at 240℃ (experiment number 5), there were many parts of the entire yarn where the fibers were fused together, the alternating twisting cycle was extremely short and the twist angle was small, and the crimp form in the over-twisted part was sufficient. The structure was completely different from that of the bulky twisted yarn portion of the present invention. Next, in experiment numbers 6 to 9, the heating temperature was set to 225°C.
Experiments were conducted by changing the stretching ratio. Stretching ratio
As the size was decreased from 1.4 times, the fibers began to fuse together and the untwisted portions increased, but ballooning also became stronger and the untwisted portions were fragmented and did not become too long. As the stretching ratio increases from 1.4 times, the untwisted portion decreases. This is thought to be due to the fact that when the fusion between fibers decreases, the tension of the thread increases. As is clear from the above experimental results, the yarn of the present invention could not be obtained by the processing method using air false twisting, no matter what conditions were adopted. Furthermore, when we made a plain woven fabric using 90 yarns per inch in the weft from the yarn obtained in the above experiment, the untwisted portions were expressed in dots, the Kasuri pattern did not appear, and the pattern itself was not beautiful. Ta. The untwisted part is short,
Moreover, since there were a large number of them, the moiré pattern was irritating and physiologically uncomfortable. Therefore, there was a significant difference in effectiveness.

Claims (1)

[Scope of Claims] 1. A multifilament yarn consisting of long fibers having false twist crimp, the yarn having a twist density along the yarn axis direction.
21000/√ (number of twists/m) or more, and has a tightly twisted yarn portion in which the crimp form of the fibers matches the twist structure of the yarn, and a twist in the opposite direction to the tightly twisted yarn portion, and Bulky twisted yarn portions in which the crimped form of the fibers is exposed are alternately present at irregular lengths, and the length ratio of the tightly twisted yarn portion to the entire yarn is 10% or more, and A real-twisted false-twisted yarn characterized in that the sum of the squares of the lengths (unit: mm) of each tightly twisted yarn portion is 3000 or more per meter of yarn (where D is the denier number). 2. The real-twist textured yarn according to claim 1, which has a tensile strength of 0.3 g/D or more. 3. The real-twisted false-twisted yarn according to claim 1, which has substantially no stainable unevenness in the yarn axis direction. 4. Claim 1, characterized in that the constituent fibers are not fused to each other, or even if they are fused, the fusion is such that they can be peeled off without cutting the fibers.
Actual twist-like false twisted yarn as described in section.