JPS62268838A - False twisted processed yarn - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a false-twisted yarn that can impart excellent dry feel, soft texture and fluffy texture to woven or knitted fabrics.

(Prior art) Conventionally, in order to give a dry feel and a fluffy feel to woven or knitted fabrics made of false-twisted yarns of synthetic fibers, in the old days, the cross-sectional shape of the single yarns was made into an irregular cross-section, or the fineness between the single yarns was changed. Various attempts have been made to make them different. For example, a false-twisting system consisting of yarn with irregular cross-sections, such as single yarns with triangular cross-sections or star-shaped protrusions, has been put into practical use as a material that eliminates the slimy feel and imparts the feel of natural fibers. .

Recently, various attempts have been made to give woven or knitted fabrics a dry feel or a fluffy feel by using false twisted yarns consisting of a plurality of yarns having different elongations or single filament finenesses. For example, if a drawn yarn with a low elongation and a highly oriented undrawn yarn or an undrawn yarn with a high elongation are simultaneously supplied during false twisting, when false twisting is heated, the drawn yarn and semi-drawn yarn or A difference in tension occurs due to the difference in elongation between undrawn yarns, resulting in a difference in yarn length.

False-twisted yarn is formed in the form of a so-called core yarn, but in such a false-twisted yarn, long single yarns, that is, high elongation yarns are entwined with low elongation yarns, so that the surface of the woven or knitted fabric is It becomes an extremely loose form and stands out. Therefore, it can be said that a woven or knitted fabric made of such false twisted yarn has a texture similar to that of natural fibers.

Furthermore, it is known that false twisted yarn obtained by simultaneously false twisting yarns having different single yarn finenesses can impart firmness, stiffness, or drape properties to woven or knitted fabrics.

(Problems to be Solved by the Invention) However, the above-mentioned false-twisted yarn consisting of a plurality of yarns with different elongations has a large difference in yarn length between the yarns, so it is difficult to make it into a woven or knitted fabric at the preparatory stage. When the false-twisted yarn is run, yarn breakage occurs and loops accumulate in the guide or tension adjustment guide, causing neps or breaks, which seriously impairs operability. In order to suppress such neps or breakage due to loop accumulation, the supply system threads are pre-paired or false-twisted without plying, and then entangled with air. The presence of interlaced points in these air-entangled yarns has the effect of suppressing the formation of loops in the guide or tension adjustment guide during running, but the difference in yarn length that occurs during false twist heating is The entanglement disappears during the interlacing treatment, and the woven or knitted fabric has a texture that lacks the illusion of fullness, or there are an extremely large number of interlaced points (when the woven or knitted fabric is seen through the fabric, the interlaced points appear thin, resulting in a so-called moth-eaten condition, which significantly reduces the quality) do.

In addition, the false twisted yarn obtained by simultaneously false twisting yarns with different single yarn finenesses can impart firmness, stiffness, or drapability to m-knitted fabrics, as described above.
When it is desired to impart a dry feel in addition to stiffness, a yarn having a relatively large proportion of single yarns with a relatively large fineness is used. however.

Since thick yarn is predominant, it has the disadvantage of exhibiting a rigid texture lacking drapability or soft feel.

In addition, if a large number of fine-grained single yarns are used in order to obtain a woven or knitted fabric with drapability or softness, the drapeability or softness will be too emphasized, resulting in a lack of firmness and elasticity, and even sliminess. It becomes a woven or knitted fabric, which is still not desirable. In other words, it has the drapability or soft feel that is characteristic of natural silk and wool, but is firm.

It has been difficult to obtain a woven or knitted fabric with a rustic feel that is both stiff and dry, from synthetic fibers.

The present invention was made in view of this situation, and
The purpose is to provide a false twisted yarn for woven or knitted fabrics that has both a dry feel and a soft fluffiness.

(Means for Solving the Problem) In order to obtain a woven or knitted fabric made of false-twisted yarn that is excellent in dry feel, soft and fluffy feel, and rich in rustic character, the present inventors have devised As a result of intensive research focusing on the properties of the yarn, we found that by selecting an appropriate mixing ratio of the large fineness component and fineness component that make up the yarn, and satisfying a specific yarn length distribution between single yarns, The present inventors have discovered that it is possible to obtain an extremely useful false-twisted yarn that has contradictory properties such as firmness, stiffness, dry feel, drapability, soft feel, and fluffy feeling, and has thus arrived at the present invention.

The present invention has a secondary configuration to achieve the above object.

20% by weight or more of fine yarn with a single yarn fineness of 3 denier or more, and 5% by weight of fine yarn with a single yarn fineness of 1.5 denier or less
A false twisted processed yarn of a blended yarn of thermoplastic synthetic fibers containing the above, characterized in that it satisfies the following formulas (1) and (2) at the same time.

1.10≦R11−・・−1−−・−・−(111,0
7≧Rtr−−−−1・−・−・・−・・(2) Here.

The yarn length of the single yarn with the maximum yarn length (I
lmax) and the yarn length (Hmin) of the single yarn with the minimum yarn length constituting the false-twisted yarn (I1max/l(min) Rh; the yarn length of any single yarn constituting the false-twisted yarn ( hi)
and the thread length is longer than (hi).

and the ratio (hi+1/hi) of the single yarn length hi+1) closest to (hi).

Hereinafter, one aspect of the present invention will be explained in detail.

In the false twisted yarn of the present invention, the fineness distribution of the single yarns constituting it is important, and the fineness yarn of 3 denier or more and the fineness yarn of 1.5 denier or less are mixed.

It is necessary that they are mixed together. The presence of such yarns of this fineness provides a feeling of firmness, stiffness, or dryness, and the presence of yarns of fineness of fineness provides a mi product having a soft feeling, a fluffy feeling, or drape performance. here.

If the fineness of the yarn is less than 3 denier, the cross-sectional area of the single yarn is small, so it is difficult to expect a repulsive force against lateral force, bending, or twisting applied to the single yarn, resulting in a decrease in stiffness and firmness. Since there is little difference in fineness from the fineness yarn, there is no unevenness and the result is a woven or knitted fabric with a slimy feel. Therefore, in order to obtain a woven or knitted fabric that has firmness, stiffness, or dryness.

The single yarn fineness is 3 deniers or more, preferably in the range of 4 to 7 deniers. It is not preferable to make a woven or knitted fabric using a yarn composed only of yarns of this fineness, since the soft feel or drape performance will be slightly lacking and the fabric will have a stiff texture.

In the single yarn fineness structure of the mixed yarn of different fineness constituting the false twisted yarn of the present invention, it is necessary that the yarn of this fineness exists in an amount of 20% by weight or more. If the composition ratio of the yarn of this fineness is less than 20% by weight, it is not preferable because the dry feel and swelling will be poor.

Furthermore, in order to impart a soft feel in addition to a dry feel and fullness, it is necessary that at least 5% by weight of fine yarn having a single yarn fineness of 1.5 denier or less be present.

When 5% by weight of fine-grained yarns with a single yarn fineness of 1.5 denier or less are ungrooved, the influence of the fine-grained yarns becomes stronger.

This is still undesirable because it lacks a soft feel and tends to result in a woven or knitted fabric with some open windows.

In the present invention, the mixing ratio of the regular fineness yarn and fine fineness yarn can be changed as appropriate depending on the desired texture as long as it is within the above range.

In the present invention, as long as the single yarn fineness configuration of the present fineness yarn and fine fineness yarn is satisfied, the single yarns constituting the yarn have a single yarn fineness of more than 1.5 denier and less than 3.0 denier. Then, the effects of the present invention can be further enhanced. In other words,
A woven or knitted fabric made of such false-twisted yarn can produce a texture extremely similar to that of natural fibers, which are characterized by uneven fineness of single filaments.

Although the cross-sectional shapes of the single yarns of the thick yarn and the fine yarn are not particularly limited, it is preferable that at least some or all of the fine yarns have an irregular cross-section. As examples of irregularly shaped cross sections, well-known multilobal or flat cross sections, or special cross sections that are a combination of these, are suitably used. In particular, when part or all of the fineness yarn is made into a special flat cross-section yarn with a rotationally asymmetric shape having a substantially linear flat trunk and a protrusion protruding from the flat trunk, the so-called woven proboscis can be improved. The twisting force that acts on the yarn during the process up to the process of weaving and impact during weaving and knitting causes the single yarns to roll and adhere to each other, thereby suppressing the reduction of the voids between the single yarns.

It is preferable that the shape of the fine-grained yarn that coexists with the main fineness yarn is generally similar to that of the thick-gained yarn.

Note that this is true for both thick yarns and fine yarns, but if the cross-sectional shape of the single yarn is varied by using two or three types, a woven or knitted fabric with an extremely good texture can be obtained. It will be done.

Next, one important thing in the present invention is that the yarn length distribution of each single yarn constituting the false twisted yarn satisfies the above-mentioned conditions 2 (1) and (2) at the same time.

That is, for a yarn with a constant yarn length, the yarn length of the single yarn with the maximum yarn length (Hmax) constituting the false twisted yarn and the yarn length of the single yarn with the minimum yarn length (Ilmin) constituting the false twisted yarn. By setting the yarn length ratio to 1.1 or more, it is possible to give the woven or knitted fabric a sense of fullness, and the protruding single yarns on the surface of the woven or knitted fabric have an irregular shape due to the difference in yarn length, so that when you slide it with your fingertips, The texture is similar to natural fibers.

In addition, the yarn length (hi) of any single yarn constituting the false twisted yarn
and the yarn length (hi+1) of a single yarn whose yarn length is longer than (hi) and closest to (hi) (hi+1/hi) is 1.
．． By making the yarn length relatively small to 07 or less, three or more types of yarn length differences exist between the single yarn with the maximum yarn length (Hmax) and the single yarn with the minimum yarn length (1 min). Namely.

Due to the yarn length difference between single yarns that occurs during false twisting,
Longer than a single yarn (hi) of any yarn length (, the single yarn (hi + 1) of the yarn length closest to this covers (hi), and furthermore, the length < (hi + 1) is closest to (hi + 1)) A yarn covered in multiple layers is formed such that a single yarn of yarn length covers yarns of (hi) and (hi + 1).

Such a false twisted yarn has many voids inside the woven or knitted fabric, giving it an excellent sense of fullness. The false-twisted yarn of the present invention contains 20% by weight or more of fineness yarns with a single yarn fineness of 3 deniers or more, which gives it a strong dry feel and tends to give a coarse/stiffness window. Regulation will curb this trend.

When the yarn length ratio Rh in the above formula exceeds 1607.

This is undesirable because it causes neps or thread breakage.

Further, the yarn length ratio R11 needs to be 1.1 or more, and preferably in the range of 1.2 to 1.3 to obtain favorable results in terms of passability in processing steps and the texture of the woven or knitted fabric. RH is 1.
If it is less than 1, the yarn length difference is short.

This results in a woven fabric that lacks fullness and softness.

Undesirable.

As the thermoplastic synthetic fiber in the present invention, polyester, polyamide, etc. are preferably used, but polyester fiber is suitable if further improvement in texture is to be achieved through alkali weight loss processing.

Moreover, additives for the purpose of imparting functionality, such as antistatic agents and flame retardants, may be added to the synthetic fibers.

Two methods for producing the false twisted yarn of the present invention will be described below.

For example, the false twisted yarn having a yarn length difference according to the present invention is as follows.

It can be obtained as follows. A method of false-twisting by feeding multiple yarns with different single yarn finenesses at different feeding speeds during false-twisting, and then intertwining the yarns with the lowest feeding speed by the amount of the feeding speed difference to give a yarn length difference. Alternatively, during spinning or drawing, a single yarn or yarn with a difference in elongation between the yarns is supplied to the false twisting process, and a single yarn or yarn with a low elongation is replaced with a single yarn or yarn with a high elongation. It can be obtained by a method of intertwining yarns to give a difference in yarn length.

In particular, in the latter method, during spinning, the yarn spun from a spinneret consisting of a plurality of orifices with different discharge hole areas, undrawn yarns or highly oriented undrawn yarns with different finenesses and elongations of single filaments. Therefore, it is suitably adopted.

When undrawn yarn or highly oriented undrawn yarn obtained by such a method is drawn and then fed to false twisting, the difference between the maximum elongation and the minimum elongation of a single yarn of the drawn yarn is 20% or more and 100% or more. %
It is preferable to set the limit to .

Particularly preferably 30% to 60%.

In this case, it is preferable that the elongation difference between each single yarn is 20% or less, and when the elongation difference is 20% or less, the generation of loops and neps can be effectively prevented during false twisting and knitting. can be suppressed.

The false twisted yarn of the present invention can also be obtained by drawing and false twisting. In this case, it is possible to use highly oriented undrawn yarn or semi-drawn yarn, which is obtained by high-speed spinning or the like and is highly oriented.

In this case as well, it is preferable that the difference between the maximum elongation and the minimum elongation of the single yarn be in the range of 30% to 60%, as described above.

Conditions such as the number of false twists or heat treatment temperature during the false twisting process vary depending on the type of synthetic fiber, the intended texture, the fineness of the yarn to be supplied, etc.9 For example, the following conditions are adopted.

The heat treatment temperature during false twisting is 180°C to 220°C.
Grade C is used.

Further, the number of false twists T (times/m) is usually set according to the Hechlein formula shown in 2 below.

T = (275000/D +60) +800 where D is the fineness of the yarn to be false twisted, (denier) Next, the method for producing the false twisted yarn of the present invention will be explained in more detail based on illustrated examples. do.

FIG. 3 is a schematic diagram of a drawing/twisting machine that draws undrawn yarn or highly oriented undrawn yarn obtained by spinning prior to false twisting. In FIG. 3, undrawn yarn or highly oriented undrawn yarn spools LA, IB.

The thread pulled out from IC and LD is guide 2A.

2B, and then heated roller 3 and stretching roller 5.
The yarn is drawn while being in contact with a heater 4 such as a heat treatment plate, passes through a guide 6, and is wound up as a mixed yarn pirn 7. This mixed yarn pirn 7 is supplied to a false twisting process as shown in FIG. 4, for example, and subjected to a false twisting process.

FIG. 4 is a schematic diagram of a false twisting machine that false-twists the mixed yarn obtained by the drawing-twisting machine shown in FIG. 3 or the highly oriented undrawn yarn that has been considerably oriented in the spinning process.

In FIG. 4, the yarn pulled out from the mixed yarn pirn or spool 8 is bundled by tension guides 9A and 9B, and then sent to a heater 11 such as a heat treatment plate provided between an apron roller 10 and an apron roller 13. Without contact, false twisting is applied by the false twisting spindle 12, and the yarn is wound up as a false twisted yarn package 16 by the winding roller 15 while being traversed by the traverse guide 14.

In the present invention, the yarn length difference is measured as follows.

60 cm of the false twisted yarn is sampled under a load of yarn fineness/30 g, and marks are placed at 5 cm from the top and bottom ends of the yarn. Next, after separating each single yarn, while checking the cross-sectional shape of the single yarn, measure the distance between the marks under a load of single yarn fineness/30g (limited to 0.05g), and measure the yarn of each constituent single yarn. Seek length.

The yarn length values obtained in this way are arranged in order (Hmax).

(Ilmin) or (hi), (hi + 1
), find the yarn length ratio R11, Rh.

In addition, the single yarn fineness of the false twisted yarn is determined by the cross-sectional shape of the single yarn.
After separating the fibers into each constituent single yarn while checking the
Measured using Denicon (manufactured by Asahiko Seiko Co., Ltd.).

Furthermore, the elongation of the single yarn was determined by checking the cross-sectional shape of the single yarn, separating it into each constituent single yarn, and then using an Instron type tensile tester to determine the elongation of the single yarn at a sample length of 10c+n and a tensile speed of 10c.
Measured under conditions of m/min.

(Example) Next, one embodiment of the present invention will be specifically explained using examples.

Examples 1-4. Comparative Examples 1 to 4 Polyethylene terephthalate containing 0.02% by weight of titanium oxide and having an intrinsic viscosity [η] of 0.65 had an orifice shape as shown in FIG. 1, and the dimensions of the orifice were such that La was 0. 12mm, Lb is 0.30mm, the angle θ of each slit is 12o°, and the spinning temperature is set to 285° using a spinneret consisting of 6 holes x 2 groups - 12 holes.
°c, discharge amount 10.2, 12.1.15.0 respectively
．． 19.9.24.8 and 30.1 g/min,
At a constant spinning speed of 1400 m/min, the single yarn fineness was 5.5, 6.5°, 8.1.10.7.13.3 and 1, respectively.
6.1 denier undrawn yarn A.

Each of 6 filaments B, C, D, E, and F was wound in two strands.

On the other hand, spinnerets with a hole diameter of 0.2 mm and a circular cross section consisting of 12 holes x 2 groups of 24 holes were each attached to a separate spindle, the spinning temperature was 290°C, and the discharge rate was 5.8°7.
．． 8.10.7, 12.6 and 15.5 g/min,
At a constant spinning speed of 1400 m for 7 minutes, 12 filaments each of undrawn yarns a + b + C + d and e with single yarn fineness of 1.6° 2.1.2.9, 3.4 and 4.2 denier were prepared. It was rolled up in two piles. The 11 types of undrawn yarns obtained in this manner were tied together in various ways as shown in Table 1, and then twisted using the drawing/twisting machine shown in FIG. 3 to a drawing ratio of 2.6. The stretching roller temperature was 85°C, and the temperature was 115°C.
The fibers were drawn and blended by contacting with a hot plate heated to ℃.

These drawn yarns were drawn using the apparatus shown in FIG.

False twisting temperature is 195°C, number of false twists is 2810 T/m,
False twisting was performed at an overfeed rate of 2%.

The single yarn fineness (denier) of the drawn yarn obtained from the above-mentioned undrawn yarns AF and a''-e and the single yarn fineness (denier) of the false twisted yarn were as follows.

Single yarn fineness, mixing ratio and yarn length ratio obtained as above (
R1! and Rh) are warped, respectively.
After passing through a series of preparation processes such as sizing.

It was woven with a plain weave structure.

The texture of these fabrics is dry and full.

The firmness, firmness, and soft feeling were evaluated by sensory tests.

In addition, the passability of the post-processing process was ranked as ◎, ○, and × in terms of the number of times the machine was stopped due to fuzz, neps, or thread cutting caused by guides during warping and sizing. In other words, those that show almost the same process passability as conventional yarns are ranked ◎, and those that require slightly more machine stoppages than conventional yarns but can still be produced at an industrial level are ranked O. did.

Items that have extremely poor processability and are difficult to produce at an industrial level are ranked as ×.

Regarding the texture of the woven fabric, drawn yarns of 50 denier/12 filament and 30 denier/12 filament, both of which have circular cross-sections, were combined as comparative woven fabrics, and using the apparatus shown in FIG. 4, False twisting temperature is 195℃,
Number of false twists is 2810 times/m + overfeed rate is 2
Using a fabric made of threads that have been false-twisted under conditions of

The firmness, firmness, and soft feel were evaluated by sensory tests and ranked as ◎, ○, and ×.

◎: Significantly better fabric than the fabric used as the evaluation standard.

O: Better than the fabric used as the evaluation standard.

×: Equal or inferior to the fabric used as the evaluation standard.

The results obtained are shown in Table 1.

In addition, in the column of yarn length ratio Rh distribution between each single yarn in Table 5,
The third row shows the distribution of yarn length ratio Rh within a single line.

The fourth row shows the yarn length ratio Rh of single yarns between adjacent yarns.

As is clear from Table 1, all of the false twisted yarns of the present invention exhibited good process passability, and the texture of the resulting fabrics was good.

Comparative Examples 1 and 2 showed cases where the proportion of thick yarns with a single yarn fineness of 3 deniers or more was insufficient. Comparative Example 3 shows a case in which there is no fineness yarn with a single yarn fineness of 1.5 denier or less, but in this case, the texture of the fabric was too rigid and lacked fluffiness and softness. Also, comparative example 4
Since the maximum value of the yarn length ratio Rh of adjacent single yarns is as large as 1.12, a loop is generated between yarns D and C, so it is necessary to avoid cutting yarns or nep on the surface of the fabric during the preparation stage before weaving. As a result, the quality of the textiles had deteriorated significantly.

Comparative Example 5 The same polyethylene terephthalate as in Example 1 was prepared using the circular cross-section spinneret (12 holes x 2 with a hole diameter of 0.2 mm).
group = 24 holes), and the spinning temperature was 290°C.

The discharge amount was 11.6 and 5.8 g/min, the spinning speed was constant at 1200 m/min, and the single yarn fineness was 3.6 and 1.
8 denier undrawn yarns f and g were each wound with 12 filaments in two strands.

The obtained undrawn yarn f, g and the undrawn yarn B.

C was stretched and false-twisted under the same conditions as in Example 1, then made into a woven fabric, and the evaluation results are shown in Table 1.

The single yarn fineness of the drawn yarns obtained from the undrawn yarns f and g is 1.3 and 0.7, respectively. Also.

The single yarn fineness of the false twisted yarn was 1.4 and 0.7, respectively.

In this case, by lowering the spinning speed, the degree of orientation of the fine yarn decreases, so that the maximum value of the yarn length ratio rill is 1.
It had dropped to 0.7. As a result, although the process passability in post-processing has improved, the texture of the fabric is poor due to the low yarn length ratio.
It had a texture without a feeling of bulge.

Example 5 Various shapes and dimensions (in l) shown in FIG.
■) [Orifice (a) to (d) = 8
Holes, orifices (H) to (CH) = 4 holes total 4
8 holes], the same polyethylene terephthalate as in Example 1 was spun at a spinning temperature of 295°C and a spinning speed of 1400.
Spinning at a discharge rate of 35.6 g/min for 7 minutes, 229
An undrawn yarn of denier/48 filament was obtained.

The obtained undrawn yarn was drawn at a drawing ratio of 2.6 using the drawing/twisting machine shown in FIG. The stretching roller temperature was 85°C, and 1
It was stretched in contact with a hot plate heated to 15°C.

When the single yarn fineness was measured while checking the single yarn cross section of the obtained drawn yarn, A was 0.79 and 1.2. C is 1.4°, 2 is 1.6. Ho is 1.9. to 2.5. 3.4. The weight was 5.1 denier.

These drawn yarns were false-twisted using a false-twisting machine shown in FIG. 4 at a false-twisting temperature of 195° C., a false-twisting number of 2810 times/m, and an overfeed rate of 2%.

The obtained false twisted yarn was opened, and the fineness, elongation, and yarn length of all the filaments were measured while checking the cross-sectional shape at T11. The results are shown in Table 2.

Note that the yarn length ratio Rh of the single yarns between 2 and 5 was 1.01.

(Note): In the yarn length ratio distribution of single yarns in Table 2, the upper row shows the yarn length ratio of 1 within the single shape? The distribution of h, the lower row shows the yarn length ratio Rh of single yarns between adjacent shapes.

The yarn length ratio) 111 was 1.24, the proportion of thick yarn was 35.6% by weight, and the proportion of fineness yarn was 30.0% by weight.

After passing through a series of preparatory steps such as warping and sizing, these false twisted yarns having a plurality of shapes and single yarn finenesses were woven into a plain weave structure. Dry the texture of the resulting fabric,
As a result of evaluating the swelling, firmness, firmness, and soft feel, it was found to have an extremely good texture. In addition, compared to conventional yarns, the yarn could be handled without any problems in terms of processability during preparation or weaving.

(Effects of the Invention) As detailed above, the false twisted yarn made of mixed yarns of different fineness according to the present invention gives woven and knitted fabrics a fluffy and soft feel while providing excellent firmness and stiffness. be able to.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of the cross-sectional shape of the orifice of a spinneret for spinning yarn used in the false twisted yarn of the present invention, and FIG. A plan view showing another example of the cross-sectional shape of the orifice of the spinneret for spinning, FIG. 3 is a schematic diagram showing an example of the stretching machine used in the example, and FIG. 4 is a false twisting machine in the example. FIG.

Claims (3)

[Claims] (1) 20% by weight or more of fineness yarn with a single yarn fineness of 3 denier or more, and 5% by weight of fine yarn with a single yarn fineness of 1.5 denier or less
1. A false-twisted yarn of a blended yarn of thermoplastic synthetic fiber containing % by weight or more, characterized in that it satisfies the following formulas (1) and (2) at the same time. 1.10≦RH………………(1) 1.07≧Rh………………(2) Here, RH is the yarn length of the single yarn with the maximum yarn length constituting the false twisted yarn ( The yarn length ratio (H_
m_a_x/H_m_i_n)Rh: The yarn length (hi) of any single yarn constituting the false twisted yarn, and
The ratio (hi+1/hi) to the yarn length (hi +1) of the single yarn closest to i). (2) The false twisted yarn according to claim 1, wherein at least a part of the fineness yarn is a yarn with an irregular cross section. (3) The false twisted yarn according to claim 2, wherein the cross-sectional shape of at least a portion of the fineness yarn is a rotationally asymmetrical shape having a substantially linear flat trunk and a protrusion.