JP2001262439A - Crimped yarn and method for producing the same, and carpet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crimped yarn which can given a carpet having a good contrast and a moire-tone pattern, to provide a method for efficiently producing the crimped yarn, and to obtain a carpet which uses the crimped yarns and has a uniform and excellent moire-tone pattern. SOLUTION: This crimped yarn in which each of single filaments constituting the multi-filament is a crimped filament that irregularly and continuously changes into thick portions/thin potions in the filament axial direction, satisfies the following requirements (1) to (3). (1) The number of peaks having changed of >=5% read from a chart measured with a Uster irregularity tester is 1 to 20.0 peaks/m of the filament length. (2) The fineness of the single filament is 10 to 45 dtex. (3) The elongation of the filament is 5 to 30% after a 98 deg.C×5 min boiling water treatment under a non-loaded condition. The method for producing the same is also provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thick and thin crimped yarn for carpet, a method for producing the same, and a carpet using the crimped yarn. More specifically, a crimped yarn capable of providing a carpet having a heather-like pattern with a good contrast by changing the amount of dyeing by having a thickness / thickness in the fiber axis direction, an efficient production method thereof, and the crimping The present invention relates to a carpet made of yarn and having a uniform and excellent heather tone.

[0002]

2. Description of the Related Art In recent years, there has been an increasing demand for improved quality and cost reduction of carpets using crimped yarn.

[0003] In the field of tile and roll carpets in particular, there is a strong demand for cost reduction of raw yarns for carpets using heathered yarns.

[0004] Regarding the method of manufacturing heather yarn for carpet,
Conventionally, various proposals have been made.
Japanese Patent Publication No. -121632 discloses a method of obtaining a heat-treated yarn by randomly mixing and entangled two or more kinds of synthetic fiber multifilaments having different dyeing properties and dyeing rates.

However, in the above-described method, it is necessary to form two yarns because two colors of heat-treated yarns are formed. In order to prepare the two yarns, it is necessary to perform each raw material chip manufacturing process. It is necessary to treat the polymer with different dyeing properties, and it is necessary to adjust the terminal group of each raw material chip.
There was a disadvantage that the manufacturing cost was high. In addition, two yarns having different dyeing performances need to be entangled in order to make them heather-like, and the process becomes complicated, and the management is complicated to obtain stable quality. From this point as well, there is a disadvantage that the manufacturing cost is increased.

Further, in the above-described method, two yarns having different dyeing performances are combined to obtain a target yarn with a target fineness, so that it is necessary to reduce the fineness of one heterodyed yarn by half. For this reason, a decrease in productivity from this point was inevitable.

Japanese Patent Application Laid-Open No. 62-206041 discloses that contrast is improved by using a dyed polyester filament fiber and a crimped polyamide filament fiber and forming a mixed fiber portion and a non-mixed fiber portion. There has been proposed a mixed fiber yarn for carpet which can obtain a strong and wide hue.

[0008] However, in the above-mentioned method, it is inevitable to divide the process by mixing other material fibers, and in this respect, not only the process becomes complicated but also the cost increases. there were. In addition, the above-mentioned method has a problem that it is difficult to recycle the mixed fiber of other material fibers, so when considering reduction of industrial waste and efficient use of resources from the viewpoint of global environmental protection. However, it was a method that inevitable inconvenience.

Furthermore, Japanese Patent Application Laid-Open No. 63-213335 proposes a false twisted yarn obtained by false twisting a polyamide multifilament yarn having unevenness in thickness and a difference in dyeing ability in the longitudinal direction of the yarn. .

However, the above false twisted yarn does not satisfy the crimping performance required for a carpet, and it has been difficult to adopt it from the viewpoint of texture, settling, and covering properties when formed into a carpet. In addition, the technique related to the false twisted yarn relates to a thick and thin spot which can be achieved because the single fiber fineness is small, and it has been difficult to apply the technique to a fiber having a single fiber fineness with the use of this technique.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems in the prior art.
Has been achieved. Therefore, the object of the present invention is to
An object of the present invention is to provide a crimped yarn capable of providing a carpet having a heathered pattern with good contrast, an efficient production method thereof, and a carpet having a uniform and excellent heathered tone using the crimped yarn.

[0012]

Means for Solving the Problems In order to solve the above problems, the crimped yarn of the present invention mainly has the following constitution. That is, the single fiber constituting the multifilament is a crimped yarn which changes irregularly and continuously in a fiber axis direction in a thick / fine manner, and satisfies the following requirements (1) to (3). It is a crimped yarn. (1) The number of fluctuating peaks of 5% or more read from the Worcester spot measurement chart is 1 to 20.0 per 1 m of yarn length, (2) the single fiber fineness is 10 to 45 dtex, (3) Elongation rate after boiling water treatment at 98 ° C. for 5 minutes under no load is 5 to 30%.

[0013] In the crimped yarn of the present invention, the following (a) to (c) are preferred embodiments, respectively, and by applying these conditions, it is expected that a more excellent effect can be obtained. it can. (A) The thickness / thickness ratio of the single fiber constituting the multifilament in the fiber axis direction is in the range of 1.2 to 5.0. (B) The total fineness of the multifilament is 550 to 22
00dtex. (C) The polymer component constituting the crimped yarn is polycapramide (N6) and / or polyhexamethylene adipamide (N66).

The method for producing a crimped yarn of the present invention mainly has the following constitution. That is, in a method for producing a crimped yarn, which comprises applying a crimp after melt-spinning, cooling, and stretching a polymer, a traveling yarn is provided by a fluid swirling air guide provided between a supply roller and a stretching roller in a stretching section. By randomly controlling contact / non-contact of the traveling yarn with a hot plate installed near the fluid swirling air guide, thereby making the traveling yarn thicker / longer in the longitudinal direction of the traveling yarn. A method for producing a crimped yarn, characterized by imparting fine spots.

Further, in the method for producing a crimped yarn of the present invention, the following (d) to (e) are preferred embodiments, respectively, and by applying these conditions, it is expected to obtain a further excellent effect. can do. (D) The air pressure of the fluid swirling air guide is set to 0.0
5 to 0.80 MPa. (E) The temperature of the hot plate is 50 ° C to 280 ° C.

Further, the carpet of the present invention mainly has the following configuration. That is, a carpet characterized by using the crimped yarn.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The crimped yarn of the present invention is characterized in that the single fiber constituting the multifilament is a crimped yarn that changes irregularly and continuously in a fiber axis direction in a thick / fine manner. The number of fluctuation peaks of 5% or more read is 1.0 to 20 per 1 m of yarn length, the single fiber fineness is 10 to 45 dtex, and 9 under no load.
The elongation rate after boiling water treatment at 8 ° C for 5 minutes is 5.0 to 30.
By satisfying the condition of 0% or less, a crimped yarn capable of providing a carpet having a mottled pattern with better contrast can be obtained.

In the present invention, "irregularly and continuously in the fiber axis direction" means that the multifilament 1 taken arbitrarily is taken out.
A continuous crimped yarn in which 0-5 m has a fluctuation peak number of 5% or more read from a Wooster speckle measurement chart defined later, 1.0 to 20.0 per 1 m of yarn length, and has no periodicity Means that It should be noted that if the thick / thin period occurs regularly, the carpet cannot have a natural mosaic tone, and the carpet has an artificial pattern, which is not preferable.

In the crimped yarn of the present invention, the fluctuation peak number of 5% or more read from the Worcester spot measurement chart has a yarn length of 1 m.
It is essential that the number is 1.0 or more.

If the number of fluctuation peaks of 5% or more is less than 1.0, the period of the dyeing difference due to the thick / fine spots becomes long, so that a carpet having a natural heather pattern cannot be obtained. When the number of fluctuation peaks exceeds 20.0,
The period of the dyeing difference due to the thick / fine spots becomes short, and the pattern becomes nearly uniform, making it impossible to obtain a carpet having a natural heather pattern.

The number of fluctuating peaks of 5% or more of the worcester spots referred to herein means the measurement and chart recording in a normal mode using a woster tester, and an arbitrary 10 m
The difference between the upper end and the lower end of the peak is read in the range of, and the difference is 5% or more.

The crimped yarn of the present invention has a single fiber fineness of 1
It is essential that it is in the range of 0 to 45 dtex, preferably 12 to 40 dtex. Single fiber fineness is 10 dte
If it is less than x, sufficient crimp cannot be obtained in the fluid crimping process, and the texture of the carpet obtained from this crimped yarn is not only too soft, it is also easily worn, and pilling occurs during use of the carpet. It is not preferable because a so-called thread ball easily occurs. In addition, the single fiber fineness is 45 dte
If the value exceeds x, the texture of the obtained carpet becomes hard, which is not suitable.

Further, the thick / thin crimped yarn of the present invention has a crimp elongation after boiling water treatment of 5.0 to 30.0%, preferably 10.0 to 25, as measured by the method described later. .0
It is essential to be in the% range. If the elongation after boiling water treatment is less than 5.0%, the bulkiness characteristic of the crimped yarn will be insufficient, and if the elongation after boiling water treatment exceeds 30.0%, the texture of the crimped yarn will be insufficient. Is undesirably hard and loses flexibility.

In addition, the thickness / thickness ratio of the multifilament in the fiber axis direction is preferably 1.2 or more, more preferably 1.3 to 5.0 or less. By setting the thickness / thickness ratio of the multifilament in the fiber axis direction in such a preferable range, a carpet having a deeper heather tone can be obtained while maintaining the yarn formability and operability.

The term "thickness / fineness ratio in the fiber axis direction" as used herein means that after multifilaments are sampled at 10 points every 50 cm, all the cross-sectional areas of individual filaments of each sample are measured using an optical microscope. The integral number of thick sections and details that are the closest to 15% of the total single fiber number are selected for each, and the average value of each cross-sectional area is calculated, and calculated from the formula [average value of cross-sectional area of thick section / average value of detailed cross-sectional area]. This is the maximum value of the values.

Further, the crimped yarn of the present invention has a total fineness of 550 to 2200 dtex, particularly 800 to 2000 dtex.
It is preferably dtex. By setting the total fineness in such a preferable range, it is possible to easily obtain desired required characteristics of the crimped yarn and the carpet while maintaining the productivity in the yarn making process and the tufting process.

The polymer component constituting the crimped yarn of the present invention comprises:
There is no particular limitation as long as the object of the present invention can be achieved, and polycapramide (N6), polyhexamethylene adipamide (N66), polyethylene terephthalate, polybutylene terephthalate, polyethylene and polypropylene can be applied. However, polycapramide (N6) and / or polyhexamethylene adipamide (N66) are preferably used from the viewpoints of texture, covering property, durability and easy dyeing which are requirements for carpet applications. Can be

The polymer component used can contain a copolymer component and a well-known additive as long as the effects of the present invention are not impaired.

Next, a method for producing a crimped yarn of the present invention will be described with reference to FIGS. FIG. 1 is a process chart showing an example of the method for producing a crimped yarn of the present invention, and FIG.
FIG. 3 is a sectional view showing an example of a fluid swirling air guide used in the present invention.

As shown in FIG. 1, when producing the crimped yarn of the present invention, first, a polymer is melted by an extruder type spinning machine (not shown) and spun from a die 1. Next, an oil agent is adhered to the yarn f obtained from the spinning section by the oil supply device 2, subsequently taken up by the supply roller 3, and drawn by the heating drawing roller 6.

At this time, the running yarn f is given a burl by a fluid swirling air guide 4 provided between the supply roller 3 and the stretching roller 6 of the stretching section, and is installed near the fluid swirling air guide 4. By randomly controlling the contact / non-contact of the traveling yarn f with the heated plate 5, the unevenness in the stretching in the length direction of the traveling yarn f is made obvious, and the length direction of the traveling yarn and the cross-sectional direction In the above, thick / fine spots having different cross-sectional areas are provided.

Next, by continuously performing a heating steam treatment in the crimping device 7, crimping is performed, and the resultant is wound around the package 10 through the rotary filter 8 and the take-up roller 9.

As shown in FIG. 2, the fluid swirling air guide 4 used in the present invention has, for example, a thread introduction hole 4a, a compressed air introduction hole 4b, and a compressed air chamber 4c. There is no particular limitation as long as the running yarn f is vibrated by the swirling compressed air, but a type in which a balloon is generated concentrically is preferably used.

The pressure of the compressed air at this time is such as to give a target thick / fine spot in consideration of the form of the fluid swirling air guide 4, the yarn production speed, the draw ratio, the total fineness, the single fiber fineness and the like. If so, there is no particular limitation, and usually a range of 0.05 to 0.80 MPa is preferable.

The temperature of the hot plate 5 is not particularly limited as long as the target thick / fine spots are imparted in consideration of the spinning speed, the draw ratio, the total fineness, the single fiber fineness and the like. Usually, the range of 50 ° C to 280 ° C is preferable.

Hereinafter, a typical method for producing a thick / thin crimped yarn capable of providing a carpet having a uniform and excellent heather tone according to the present invention will be described.

The thick / thin crimped yarn of the present invention can be obtained by adding the above-mentioned stretching point to the usual melt-spinning process, which is basically composed of the steps of melt spinning, cooling, oiling, stretching and crimping. Manufactured by using a fluid swirling air guide and hot plate to vary.

As the melt spinning apparatus used in the present invention, both an extruder type spinning machine and a pressure type spinning machine can be used, but the former is preferable in terms of product uniformity and yield in the spinning process.

The cross-sectional shape of the spinneret used in the present invention is not particularly limited, such as a round shape, a Y-type, a Y-type hollow, a rice-shaped hollow, and a flat type. Just adjust it. The melt-spun yarn is guided to a drawing step after cooling and refueling.

At the time of stretching, as described above, a balloon is given to the yarn by the fluid swirling air guide, and in addition, the contact / non-contact with the hot plate is controlled at random, so that the stretching unevenness of the yarn becomes apparent. Then, thick / fine spots having different cross-sectional areas in the length direction of the filament and in the cross-sectional direction are provided.

The stretching ratio is preferably in the range of 1.2 to 3.0 times, more preferably 1.4 to 2.8 times. By setting the draw ratio in such a preferable range, the required characteristics of the desired crimped yarn and carpet can be easily obtained.

Next, crimp is applied by a crimp applying device. The crimp may be applied by a normal heating fluid processing process. For example, various crimping methods such as a jet nozzle type, a jet stuffer type, and a gear system may be adopted. The jet nozzle method is preferable in order to achieve the formation, and for example, a crimp nozzle described in US Pat. No. 3,781,949 is preferably used. In this case, for the purpose of fixing the crimp, for example, as described in JP-A-5-31058, a cooling device and a rotary filter may be combined.

In the method for producing a crimped yarn of the present invention, the yarn introduced into the crimping nozzle may be preliminarily entangled for the purpose of controlling the processability and the crimping characteristics. Absent.

The thick / fine crimped yarn thus obtained is
It can be tufted by a known method, and is particularly suitably used for carpet applications.

The thick / thin crimped yarns of the present invention may be cut pile,
Although it can be applied to various carpet applications such as loop pile, cut and loop, and saxony tone, the most excellent effect is exhibited especially when cut pile and loop pile are tufted.

Further, in order to enhance the design of the carpet, standards such as cut and loop may be adopted. The pile length of the carpet may be appropriately set depending on the application, but is selected from 2 to 30 mm, preferably from 4 to 20 mm.

At this time, for the purpose of enhancing the antistatic property of the carpet and further improving the design, the antistatic yarn, the monofilament, and other yarns are mixed as long as the effect of the present invention is not impaired. Weaving is no problem.

The carpet is backed by a known method. In this case, it is recommended to perform shearing as necessary as a more preferable technique. Further, in order to enhance the antifouling property, application of an antifouling agent may be performed at all.

The carpet using the thick / thin crimped yarn of the present invention makes use of the uniform and excellent heather tone, and is particularly suitable as a household carpet. It can also be used for applications such as business carpets and carpets for vehicles.

[0050]

The present invention will be further described with reference to the following examples. The physical property values in the examples described above and below are values obtained by the following methods. [Total fineness] Measured according to JIS L 1090. [Single fiber fineness] The total fineness measured as described above was gradually obtained based on the number of single fibers. [Number of fluctuation peaks in Worcester spots] USTER TESTE
R MONITOR C (Zellweger UST
(Manufactured by ER Co., Ltd.) under the following conditions and recorded on a chart. Yarn speed: 25 m / min Measuring mode: Normal Measuring range: 50% Measuring tension: 5 Measuring time: 1 min Twist: Z2 Select any 10 m from the above chart, read the difference between the upper and lower ends of the peak and read the difference Was counted as 5% or more, and then determined as the number of fluctuation peaks per 1 m of yarn length. [Thickness / fineness ratio in the direction perpendicular to the fiber axis] 5 multifilaments
Sampling is performed at 10 points every 0 cm. Using an optical microscope, measure all the cross-sectional areas of the individual filaments of each sample, select the integral number of thick portions and details closest to 15% of the total number of single fibers for each sample, and average each cross-sectional area. The thickness / thickness ratio is calculated by calculating the values and applying the average value of each cross-sectional area to the following equation. Thick / thin ratio = thick section average area / fine section average value The maximum value of the thick / fine ratio for each sample calculated by the above method was used as data. [Crimp elongation rate after boiling water treatment] 98
After boiling water treatment for 5 min.
g / d) and the length (L2) measured with a constant load (100 mg / d), and then the formula [(L2-L1) / L1]. × 100
[Meat feeling] calculated by [Evaluation of natural heat feeling when made into a carpet, ◎ ‥ very good, ○ ‥ good, △ slightly poor, × ‥
It was classified into four stages of failure. [Stretching processability] The yarn breakage due to stretching was evaluated.
Very good, ○ ‥ good, △ slightly poor, × ‥ bad 4
It was divided into stages. [Hand feeling] Sensory evaluation of hand feeling when stepping on the carpet, ◎: extremely good, ○ △ good, △ slightly poor, ×
(4) Classified into the four worst stages.

Example 1 Polycapramide (N6) was melted by an extruder type spinning machine and spun from a trilobal die. First, an oil agent is applied to the yarn obtained from the spinning section by an oil supply device, and then the yarn is taken up by a supply roller.
2.0 times with a hot stretch roller of 140 ° C or more, 220 times
The film was stretched at 0 m / min. At that time, while giving a balloon to the running yarn at a pressure of 0.3 MPa with a fluid swirling air guide, and by randomly controlling contact / non-contact on a hot plate of 250 ° C., after applying stretch unevenness, Continuously, a heating steam treatment at 200 ° C. or more was performed by a crimping device to apply crimp. Then, the crimp is stretched to the extent that it does not settle, and finally wound up with a winding tension of about 0.09 g / dtex to obtain 1450 dte ×
A 68-filament polyamide crimped yarn was obtained. At this time, the yarn forming property was evaluated, and the thick and small spots in the fiber axis direction of the obtained crimped yarn were measured. Further, the thick / thin crimped yarn obtained above was tufted as a cut pile carpet, and the texture of the obtained carpet was evaluated. The results are shown in Table 1.

[0052]

[Table 1] As is clear from the results in Table 1, according to the first embodiment,
An excellent polyamide crimped yarn for carpet and a carpet having an excellent heather feeling and texture and having extremely excellent drawability were obtained.

[Examples 2 and 3] Spinning, tufting, and the like were performed in the same manner as in Example 1 except that the pressure of the fluid swirling air guide was controlled so that the number of thick peaks of Worcester spots shown in Table 1 was obtained. An evaluation was performed, and the results are shown in Table 1. As is clear from the results in Table 1, according to Example 2, an excellent crimped polyamide yarn and carpet for a carpet having an extremely excellent heather feeling and having excellent stretchability and texture were obtained. Was. In the third embodiment,
Although the drawability was slightly inferior, a polyamide crimped yarn for carpet and a carpet having an extremely excellent heather feeling and an excellent texture were obtained.

Example 4 Spinning, tufting and evaluation were carried out in the same manner as in Example 1 except that the discharge rate was controlled so as to obtain the single fiber fineness and the total fineness shown in Table 1. Also shown in Table 1. As is apparent from the results in Table 1, according to Example 4, although the drawability was somewhat inferior, the polyamide crimped yarn for carpets had an excellent heather feeling and an excellent texture. And a carpet were obtained.

Example 5 Spinning, tufting, and the like were performed in the same manner as in Example 1 except that a 54-hole die was used so as to obtain the single fiber fineness and the total fineness shown in Table 1, and the discharge amount was controlled. An evaluation was performed, and the results are shown in Table 1. As is evident from the results in Table 1, according to Example 5, although the texture was slightly inferior in terms of rough and stiffness, it had excellent heather feeling and excellent stretchability. Thus, a thick polyamide thin crimped yarn for carpet and a carpet were obtained.

[Examples 6 and 7] Spinning, tufting and evaluation were carried out in the same manner as in Example 1 except that the elongation rate after the treatment with boiling water shown in Table 1 was controlled. Also described in 1. As is clear from the results in Table 1,
In Example 6, a crimped polyamide carpet yarn and a carpet having an excellent heather feeling and an extremely excellent drawability were obtained, although the softness was slightly inferior in terms of softness. Further, in Example 7, although the texture was slightly inferior in that the texture was hard, a polyamide crimped yarn for carpet and a carpet having excellent heather feeling and extremely excellent stretchability were obtained.

[Examples 8 and 9] Spinning, tufting and evaluation were performed in the same manner as in Example 1 except that the hot plate temperature was controlled so as to obtain the thickness ratio in the direction perpendicular to the fiber axis as shown in Table 1. The results are shown in Table 2.

[0058]

[Table 2] As is evident from the results in Table 2, according to Example 8, excellent polyamide crimped yarns and carpets for carpet having extremely excellent heather feeling and excellent stretchability and texture were obtained. Was. Further, according to Example 9, although the stretchability was somewhat inferior, a polyamide crimped yarn for carpet and a carpet having an extremely excellent heather feeling and an excellent texture were obtained.

Example 10 Spinning, tufting and evaluation were performed in the same manner as in Example 1 except that polyhexamethylene adipamide (N66) was used as a raw material polymer. The results are shown in Table 2. As is evident from the results in Table 2, according to Example 10, an excellent crimped polyamide yarn for carpet and a carpet having excellent heather feeling and texture and having extremely excellent drawability were obtained. Was done.

[Comparative Examples 1 and 2] Spinning, tufting, and the like were conducted in the same manner as in Example 1 except that the pressure of the fluid swirling air guide was controlled so that the number of thick peaks of Worcester spots shown in Table 1 was obtained. Evaluation was performed, and the results are shown in Table 3.

[0061]

[Table 3] As is evident from the results in Table 3, in Comparative Example 1, the heather feeling did not appear, and only a polyamide crimped yarn unsuitable for carpet applications was obtained. In Comparative Example 2, the heather pattern was fine, and only a crimped polyamide yarn unsuitable for carpet use was obtained.

[Comparative Example 3] Spinning, tufting, and the like were performed in the same manner as in Example 1 except that a 90-hole die was used and the discharge amount was controlled so that the single fiber fineness and the total fineness shown in Table 1 were obtained. Evaluation was performed, and the results are shown in Table 3. As is clear from the results in Table 3, in Comparative Example 3, the stretchability was inferior, and the texture was too soft, so that only a polyamide crimped yarn unsuitable for carpet applications was obtained.

[Comparative Example 4] Spinning, tufting, and the like were performed in the same manner as in Example 1 except that a 40-hole die was used and the discharge amount was controlled so that the single fiber fineness and the total fineness shown in Table 1 were obtained. Evaluation was performed, and the results are shown in Table 3. As is clear from the results in Table 3, in Comparative Example 4,
The texture was extremely coarse and rigid, and only a polyamide crimped yarn unsuitable for carpet applications was obtained.

[Comparative Examples 5 and 6] Spinning, tufting, and evaluation were performed in the same manner as in Example 1 except that the elongation ratio after boiling water treatment was controlled as shown in Table 1, except that control was performed. Also described in 1. As is clear from the results in Table 3,
In Comparative Example 5, the texture was soft and the bulkiness was insufficient, and only a polyamide crimped yarn unsuitable for carpet use was obtained. Further, in Comparative Example 6, only a polyamide crimped yarn, which was slightly hard and coarse and stiff, was unsuitable for carpet use.

[0065]

As described above, according to the crimped yarn of the present invention, it is possible to provide a carpet having a heather-like pattern with good contrast. Further, according to the method for producing a crimped yarn of the present invention, the above-described crimped yarn can be efficiently produced. Further, the carpet of the present invention has a uniform and excellent heather tone and feeling, and is particularly suitable as a household carpet.

[Brief description of the drawings]

FIG. 1 is a process chart showing an example of a method for producing a crimped yarn of the present invention.

FIG. 2 is a sectional view showing an example of a fluid swirling air guide used in the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cap 2 Lubricating device 3 Supply roller 4 Fluid swirling air guide 4a Thread introduction hole 4b Compressed air introduction hole 4c Compressed air chamber 5 Hot plate 6 Stretching roller 7 Crimp applying device 8 Rotary filter 9 Tick-up roller 10 Package f Thread

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3B120 AA15 AA35 BA02 DB03 EB19 4L036 MA06 MA33 PA17 PA41 RA03 RA04

Claims (8)

[Claims] 1. A single fiber constituting a multifilament is a crimped yarn which changes irregularly and continuously in a fiber axis direction in a thick / fine manner, and satisfies the following requirements (1) to (3). A crimped yarn characterized by the above-mentioned. (1) The number of fluctuating peaks of 5% or more read from the Worcester spot measurement chart is 1 to 20.0 per 1 m of yarn length, (2) the single fiber fineness is 10 to 45 dtex, (3) Elongation rate after boiling water treatment at 98 ° C. for 5 minutes under no load is 5 to 30%. 2. The crimped yarn according to claim 1, wherein a thickness / thin ratio in a fiber axis direction of a single fiber constituting the multifilament is in a range of 1.2 to 5.0. 3. The multifilament has a total fineness of 55.
2. The method according to claim 1, wherein the number is from 0 to 2200 dtex.
Or the crimped yarn according to 2. 4. The polymer component constituting the crimped yarn is polycapramide (N6) and / or polyhexamethylene adipamide (N66).
4. The crimped yarn according to any one of items 1 to 3. 5. A method for producing a crimped yarn, which comprises applying a crimp after melt-spinning, cooling and stretching a polymer, wherein a fluid swirling air guide provided between a supply roller and a stretching roller in a stretching section. By giving burl to the running yarn, and by randomly controlling the contact / non-contact of the running yarn with respect to the hot plate installed near the fluid swirling air guide, in the length direction of the running yarn A thick / fine spot is provided on the contrary.
The method for producing a crimped yarn according to any one of the above. 6. The method according to claim 5, wherein the air pressure of the fluid swirling air guide is set to 0.05 to 0.80 MPa. 7. The method according to claim 5, wherein the temperature of the hot plate is 50 ° C. to 280 ° C. 8. A carpet comprising the crimped yarn according to claim 1.