JP2002242022A - Spinneret - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spinneret suitable for stably spinning a multifilament yarn for a crimped yarn which can give a carpet scarcely developing longitudinal lines. SOLUTION: In this spinneret which has two or more Y-shaped nozzles having different shapes, respectively, in the spinneret is the Y-shaped nozzles having the same shape are gathered in the spinneret and that the Y-shaped nozzle groups having different shapes, respectively, are divided with a line or with two lines which do not cross each other on the surface of the spinneret.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a spinneret,
Particularly, the present invention relates to a spinneret suitable for producing a crimped yarn for carpet. More specifically, a spinneret in which two or three types of Y-shaped cross-section yarns are mixed, which is suitable for stably spinning a multifilament for a crimped yarn capable of manufacturing a carpet with reduced generation of warpage. It relates to a spinneret.

[0002]

2. Description of the Related Art A crimped yarn represented by a carpet usually has an irregular cross section in order to make use of its bulky property. Mold hollow section, flat section, and star-shaped section.

[0003] In particular, the Y-shaped cross-section yarn has high bulky performance of the crimped yarn and also has high crimp fastness of the crimped yarn, so that the design of a discharge hole in a die is relatively easy, and Since it has advantages such as easy perforation, it is widely used as a crimped yarn for carpet. In particular, in cut-type carpets requiring a sense of volume, particularly in line mats, option mats, and rental mats, mainly Y-shaped crimped yarns are used.

On the other hand, the main purpose of using a carpet is to provide an atmosphere that is well adapted to the use as an interior. Therefore, various characteristics such as texture, touch, and volume, as well as colors and patterns, are used. Is required depending on the application.

In particular, carpets such as optional carpets, roll carpets, and line carpets are required to have excellent cushioning and high-grade feel, as well as excellent space effects as an interior, and particularly to have a uniform and calm atmosphere. As a result, these carpets are often made of light color that does not get tired. These carpet surfaces are required to be rich in uniformity, and it is said that it is preferable to eliminate defects on the carpet surface such as color, pattern, and spots on the pattern as much as possible.

[0006] Ordinary carpets are produced by tufting several hundred to nearly 2000 crimped yarns substantially parallel to the base cloth. Therefore, there is a difference in the characteristics of the adjacent crimped yarns on the carpet, and if a difference occurs in the color, it will be visually recognized as a vertical streak. This vertical streak is not preferable because it degrades the quality of the carpet. In particular, in the case of a cut pile using a single color, there is a disadvantage that a slight difference in the crimping characteristics of the pile used tends to be a vertical streak.

[0007] The causes of the above vertical muscles include:
There are mainly two types of factors: morphological differences and dyeing differences. The vertical streaks caused by the morphological difference referred to here means that, when the crimp level of the crimped yarn constituting the pile is different depending on the pile constituting the carpet, the height of the pile is different on the surface of the carpet, and It is a visible phenomenon. On the other hand, the vertical streaks caused by the difference in dyeing means that the fiber structure of the crimped yarns that compose the pile varies depending on the pile. It is. Of course, the combination of both the morphological difference and the dyeing difference often forms a vertical streak.

Conventionally, various proposals have been made to reduce the vertical streaks of the carpet. But,
In order to reduce warp, the manufacturer of tufts uses as much crimped yarn as possible for one carpet by using a crimped yarn manufactured by the same machine at almost the same time as possible. Complicated management, such as using crimped yarn and using only those having a certain degree of deformation or L value within the range of crimped yarn used, has been implemented, but this still causes warpage. Is not nothing.

Further, in order to reduce the difference in characteristics between the inner layer and the outer layer of the cheese of the wound crimped yarn, the winding tension may be reduced, or as described in, for example, Japanese Patent Publication No. 57-2627. Some proposals have been made to stabilize the yarn just before taking it by adding water, but none of them has solved the warp.

Japanese Patent Publication No. 58-51048 proposes an attempt to obtain a uniform crimped yarn by specifying a heat shrinkage rate and a preheating temperature at the time of crimping in a crimping nozzle. However, in this method, uniformity is limited, and a crimped yarn that can withstand subsequent process fluctuations cannot be obtained, and the warp of carpet has not been reduced.

[0011] Even if the crimped yarn once formed is subjected to some abnormal tension in a part of the crimped yarn in the processing step of rewinding and dyeing, and the crimp is partially elongated, the warp due to the difference in form is also caused. Muscles are thought to develop. For this reason, there has been an attempt to reduce the warp by increasing the crimp level of the crimped yarn to make the crimped yarn resistant to process fluctuations in the processing step. However, this method cannot completely absorb the effects of process variations, so that the effect of reducing the warp is small, and the average crimp level of the crimped yarn is high, so that the texture as a carpet Is firm,
There was a disadvantage that it became a felt strike.

JP-B-63-16487 discloses a method for obtaining a stable low-crimped yarn by steam-setting the crimped yarn. However, in this method, it is not possible to set the roll to withstand the fluctuation of the winding tension after the setting, and it is difficult to completely solve the warp, and also to pass the crimped yarn through the steam pipe. However, there is a drawback that the process passing property is poor and a stable crimped yarn cannot be obtained.

[0013]

Although various improvements have been proposed as described above, all of these proposals are intended to reduce warp by producing a more uniform crimped yarn. However, in any of the proposals, the improvement effect has a limit.

The present inventors have previously proposed a crimped yarn capable of reducing the warp of a carpet by forming a multifilament from a combination of two or three types of single yarns having different degrees of deformation. did. This method is not a concept of reducing warp by using a more uniform crimped yarn of the related art, and it is visually recognized as warped even if there is a factor of warp in a crimped yarn having a certain degree of variation. This is based on the principle of becoming difficult, and the obtained effect of reducing the vertical streak is very high.

However, according to the subsequent studies by the present inventors, in the method proposed by the present inventors, special measures are required for the dimensions and arrangement of the base discharge holes. It was found that there were many single yarn collisions during spinning and the process became unstable. In other words, when a plurality of types of yarns having different degrees of deformation are simultaneously drawn and spun, the cooling state is different due to the difference in the surface area of each single yarn, which makes it difficult to stably produce yarn. It was.

On the other hand, Japanese Patent Application Laid-Open No. H08-113837 discloses that in order to produce a polypropylene-based hetero-shrink mixed fiber,
A method is disclosed in which two types of polymers are introduced into one die and the group of holes is discharged from the die. However, this method is intended to obtain a polypropylene-based odor-shrinkable shrinkable mixed fiber without making air entanglement indispensable, and is not intended to obtain a bulky crimped yarn. In addition, the arrangement of the base holes to be used is mainly in an annular arrangement, and no specific disclosure about the base holes is provided, and the polymer to be used is limited to the polypropylene copolymer.

Further, Japanese Patent Application Laid-Open No. Hei 3-176005 proposes a method for obtaining a crimped yarn obtained by combining two kinds of multifilaments having different degrees of deformation. However, this method is a method of obtaining multifilaments by combining filaments formed by using different spinning machines, and specifically discloses obtaining filaments of two types of deformation with one die. There was no.

In any case, a plurality of Y-shaped discharge holes having two or more kinds of deformation degrees are formed in one die for a crimped yarn for the purpose of reducing vertical streaks in a die for producing a crimped yarn for carpet. Conventionally, no proposal has been made for using a spinneret having a spinneret.

The present invention has been achieved as a result of studying solving the above-mentioned problems in the conventional technology as a problem. Therefore, an object of the present invention is to stably spin a multifilament for a crimped yarn, which is a spinneret in which two or three types of Y-shaped cross-section yarns are mixed and can produce a carpet with reduced generation of warpage. The object of the present invention is to provide a spinneret suitable for the above.

[0020]

In order to solve the above-mentioned problems, a spinneret of the present invention has two different shapes in one spinneret.
A spinneret having a plurality of types or three types of Y-type discharge holes. In this die, Y-type discharge holes having the same shape are gathered, and the arrangement of each group of Y-type discharge holes having different shapes is determined. It is characterized by being divided by one straight line or a straight line that does not intersect on two bases.

In the spinneret of the present invention, the following conditions (1) to (3) are preferable conditions, and further excellent effects can be expected by applying these conditions. (1) Of the two or three types of Y-type discharge holes, the slit length L in the Y-type discharge hole a having the longest peripheral length of the discharge hole.
a, a slit width Wa, a slit depth Da, and a slit length Lb, a slit width Wb, a slit depth Db of a Y-type discharge hole b having the shortest peripheral length of the discharge hole, and a Y-type discharge hole having a peripheral length of the intermediate discharge hole. slit length Lc and slit width W at c
The spinneret according to claim 1, wherein c and the slit depth Dc are in the relationship of the following formulas (1) and (2). 0.85 ≦ (Dj × Li × Wi ³ ) / (Di × Lj × Wj ³ ) ≦ 1.15 (1) (where (i, j) indicates any two combinations of abc, where Of the two combinations, the longer one of the circumferences of the discharge holes is i and the shorter one is j.) 1.3 ≦ La / Lb (2) (2) (2) Slit width in each of the Y-type discharge holes W is 0.1
3 to 0.3 mm, slit depth D is 0.2
0.8 mm. (3) The respective Y-shaped discharge holes are arranged at intervals of 10 mm or more.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings. FIG. 1 is a front view showing an example of the spinneret of the present invention, FIG. 2 is a front view showing another example of the spinneret of the present invention, and FIG. 3 is an illustration showing an example of a Y-type discharge hole in the spinneret of the present invention. FIG. The spinneret in the present invention is a spinneret having two or three types of Y-shaped discharge holes B having different discharge shapes in one die A.

That is, in the spinneret shown in FIG. 1, one die A has a plurality of two types of Y-type discharge holes B having different shapes, and the Y-type discharge holes having the same shape are gathered. The arrangement of the groups a and b of each group of Y-shaped ejection holes having different shapes is divided by one straight line b. Not all Y-shaped discharge holes in the spinneret A are described, and description is omitted by.

In the spinneret shown in FIG. 2,
A single die A has a plurality of three types of Y-type discharge holes B each having a different shape, and the Y-type discharge holes having the same shape are gathered together. Gathering a,
The arrangement of b and c is separated by two parallel lines b. That is, the discharge hole group c having the middle slit length is arranged at the middle position between the discharge hole group a having the longest slit length and the discharge hole group b having the shortest slit length, and the arrangement of the groups a, b, and c is set. However, they are separated by straight lines that do not intersect on the two base surfaces, preferably parallel lines b. In FIG. 2, as in FIG. 1, all of the Y-shaped discharge holes in the spinneret A are not described, and description is omitted by.

In FIGS. 1 and 2, a straight line A or a parallel line B for separating each group is shown by a solid line.
This is written in an easy-to-understand manner, and there is no straight line or curve in the actual base itself.

In the spinneret of the present invention, as described above, it is necessary that the Y-shaped discharge holes having the same shape are gathered. The discharged single yarn has a different discharge amount and a different cooling state in each of the two or three types of Y-shaped discharge holes having different discharge shapes as described above, so that the spinning tension is also different and the yarn at the time of cooling immediately after spinning is different. The shaking states are also different from each other. Here, if two or three types of Y-shaped discharge holes having different discharge shapes are arranged randomly or interleaved, the degree of occurrence of single yarn collision due to yarn sway becomes large and stable spinning becomes difficult. Become.

However, in the spinneret of the present invention, among the two or three types of Y-shaped ejection holes having different ejection shapes, the same-shaped Y-shaped ejection holes are gathered. Since the same yarn swaying state occurs, spinning can be stably performed.

In the spinneret of the present invention, among the two or three types of Y-shaped discharge holes having different shapes, the group of the Y-shaped discharge holes having the same shape is arranged in one straight line. Alternatively, it is necessary to be separated by two non-intersecting straight lines, preferably parallel lines. That is, even if Y-shaped discharge holes having the same shape are gathered as described above, for example, if they are arranged in a concentric shape, it is possible to suppress the buffer with the yarns of the other discharge holes so much. Can not.

However, the arrangement of the groups of the Y-shaped discharge holes having the same shape is divided by one straight line or two straight lines which do not intersect on the base surface, preferably parallel lines. The buffer between the yarns of the group can be more effectively suppressed. And 2 different in shape
If there are two groups of Y-type discharge holes of one kind, it is one straight line, and if there are three groups of three kinds of Y-type discharge holes having different shapes, two straight lines do not intersect on the base surface. It is preferable that each is divided.

[0030] In particular, the cooling air for cooling the yarn is made into a uni-float chimney style from one direction, and the one or two parallel straight lines are arranged perpendicular to the direction of the wind, so that the yarns of the groups of each other are formed. The vibration damping can be minimized. Here, the arrangement of the ejection holes in the group where the spinning tension is low and the yaw of the yarn is relatively large is arranged on the farthest side from the chimney side so as not to buffer the other yarn groups even if the yarn overhangs by the chimney yarn. Is a preferred method.

The Y-shaped discharge hole in the spinneret of the present invention is:
As shown in FIG. 3, it indicates a shape of a discharge portion determined by a slit length L, a slit width W, and a slit depth D of a Y-shaped shape on a discharge surface. Although the slit depth D is not shown in FIG. 3, the vertical depth of the discharge hole portion from the surface of the die is D.

In other words, if any one of these values differs in the Y-shaped discharge hole of the die, the cross-sectional shape of the yarn immediately after the discharge and the discharge amount per single hole of the polymer will change. Are different, and the degree of deformation as a yarn can be different.

In the spinneret of the present invention, the slit length La, the slit width Wa, and the slit depth of the Y-type discharge hole a having the longest peripheral length of the two or three types of Y-type discharge holes having different shapes. It is preferable that the length Da, the slit length Lb, the slit width Wb, and the slit depth Db of the Y-shaped discharge hole b having the shortest discharge hole peripheral length satisfy the following expressions (1) and (2). 0.85 ≦ (Dj × Li × Wi ³ ) / (Di × Lj × Wj ³ ) ≦ 1.15 (1) (where (i, j) indicates any two combinations of abc, where Of the two combinations, the longer one of the discharge hole circumferential lengths is i, and the shorter one is j.) 1.3 ≦ La / Lb (2).

When the base is constituted by three different discharge holes, the combination of i and j in the above equation is (a,
There are three types, b), (a, c), and (b, c), and it is preferable that any of the values be 0.85 or more and 1.15 or less.

When the value of the above-mentioned formula (1) is in the range of 0.85 to 1.15, each yarn spun from each group consisting of two or three types of Y-shaped discharge holes having different shapes. The single yarn fineness can be made substantially the same. Two or three different shapes
Since the single yarn fineness of each yarn spun from each group of the Y-type discharge holes is approximately the same, when the resulting yarn crimped yarn is applied to a carpet, Due to the mixed effect, the warp can be reduced while maintaining the overall texture and crimp level. When the value of X is out of the above range, although there are two or three groups of Y-shaped cross-section yarns having different degrees of deformation, the characteristics of the yarn having a large total fineness become dominant, resulting in moderate variation. You will not be able to do it. Conversely, in order to maximize the effect of reducing the vertical streaks of the present invention, it is preferable to adopt a die design that makes the single yarn fineness between groups substantially the same. More preferably, the number of filaments in each group is made the same, and the total fineness of each group is made substantially the same, which is more effective for the effect of reducing the vertical streaks of the present invention.

In the spinneret of the present invention, in order to more clearly show the difference in the degree of deformation of the Y-shaped cross-section yarns having different degrees of deformation in the second or third group, the ratio of the slit length L in each Y-type discharge hole is determined. In the discharge hole having the longest circumference of the discharge hole and the discharge hole having the shortest circumference of the discharge hole, the ratio is preferably 1.3 or more, more preferably 1.5 or more. That is, by setting the ratio to 1.3 or more, the difference in the degree of deformation between the groups can be made sufficiently large, and the effect of reducing the vertical streak becomes greater.

Further, in the spinneret of the present invention, the slit width W of each of the two or three groups of Y-type discharge holes having different degrees of deformation is preferably 0.13 mm or more and 0.3 or more.
mm or less, more preferably 0.16 mm or more and 0.25 m
m or less. If the slit width is smaller than the above range, not only is processing of the die difficult, but also the ejection of the polymer becomes unstable, and the die tends to be clogged. On the other hand, if it exceeds the above range, the back pressure of the die becomes low, the variation in single yarn becomes large, and the yarn production becomes difficult.

In the spinneret of the present invention, the slit depth D of the Y-type discharge holes of each of two or three groups having different degrees of deformation is usually 0.2 mm to 0.8 mm, more preferably 0.35 mm. When the thickness is in the range of 0.6 mm, stable processing of the die discharge hole is possible, and an appropriate back pressure is easily obtained, so that stable yarn production becomes possible.

In the spinneret of the present invention, each Y-shaped discharge hole is arranged at intervals of 10 mm or more, more preferably 12 mm or more, in order to suppress buffering and collision of the single yarn during spinning. Is desirable.

According to the spinneret of the present invention having the above-described structure, a multifilament for a crimped yarn capable of producing a carpet with reduced generation of warpage is used for two or three types of Y-shaped cross sections having different discharge shapes. The spinning can be stably performed without causing the occurrence of single yarn collision due to the yaw of the yarn.

[0041]

The present invention will be described in more detail with reference to the following examples. Each physical property value in the above description and in the following examples is specifically a value measured by the following method.

[Sulfuric acid relative viscosity] A polymer sample was dissolved in 98% sulfuric acid at a concentration of 1% by weight, and measured at 25 ° C using an Ostwald viscometer.

[Total fineness] Measured according to JIS L 1090.

[Single fiber fineness] The total fineness measured according to JIS L 1090 was divided by the number of single fibers.

[Crimp elongation rate after boiling water treatment] Room temperature (25
The crimped yarn unwound from a package that has been left in an atmosphere at a relative humidity of 50 to 75% for 20 hours or more is immersed in boiling water for 30 minutes under no load, and then to an equilibrium moisture content. After drying, this is used as a crimped yarn sample after boiling water treatment. After an initial load of 2 mg / d is applied to this sample yarn and 30 seconds have elapsed, marking is performed on a sample length of 50 cm (L ₁ ). Next, a constant load of 100 mg / d is applied to the sample, and after elapse of 30 seconds, the elongated sample length (L ₂ ) is measured.
Next, the crimp elongation rate (%) is determined by the following equation. The crimp elongation rate (%) = [(L ₂ −L ₁ ) / L ₁ ] × 100 The atmosphere conditions when leaving the yarn before the boiling water treatment are the same as those used in the actual carpet manufacturing process. Crimped yarn state, that is, a state in which the crimping property reaches an equilibrium state due to moisture absorption, selected from the point that it does not take too much time to reach the equilibrium state and does not cause condensation. It is.

[Degree of Deformation of Y-Shaped Yarn] The cross section is enlarged with a microscope, and the ratio of the diameters of the circumscribed circle and the inscribed circle is defined as the degree of deformation.
The average value of five single fibers is measured.

[Yarn-forming property (yarn breakage)] The state of yarn breakage during yarn-making was observed, and the overall evaluation was made relatively as follows. ◎: No thread break occurs at all ○: Little thread break occurs ×: Thread breaks occur frequently.

[Carpet vertical streaks]
It was left under a fluorescent lamp of W, and the carpet surface was observed along the tuft direction of the pile from a distance of about 3 m, and the occurrence of warping was evaluated relatively as follows. …: No vertical streaks, uniform and clean surface ○: The uniformity of the surface is slightly inferior to the level of ◎, but no vertical streaks △: No clear vertical streaks, but there are spots in each pile × × Looks muscular. Or there are vertical streaks.

Example 1 Using the spinneret shown in FIG. 1, two groups of Y having different shapes consisting of a slit length L, a slit width W, a slit depth D and the number of holes shown in Table 1 were used.
Using a spinneret having a mold discharge hole, sulfuric acid relative viscosity 2.8
The nylon 6 chips were melt-spun by an extruder-type spinning machine at a discharge rate of 280 g / min to obtain two groups of Y-shaped cross-section yarns having different degrees of deformation with a single die. here,
In order to minimize the effects of yarn sway and yarn collision, a discharge hole that becomes a multifilament with a high degree of deformation is installed on the Uniflo Chimney side, and a straight line that separates each group of two groups of Y-shaped discharge holes with different shapes, It was made vertical to the cooling air.

The degree of deformation of the two types of Y-shaped cross-section yarns obtained here was 4.0 and 2.1, and smooth yarn production was possible without single yarn collision. At this time, (Dj) in the spinneret
× Li × Wi ³ ) / (Di × Lj × Wj ³ ) value (X)
Is calculated to be 1.06. Each Y-shaped discharge hole is 20 m
m.

The aligned two groups of filaments having a Y-type degree of deformation are then supplied with oil, stretched, and subsequently wound without being wound on a jet nozzle (JN) described in JP-B-58-1214. And then wound to give a polyamide multifilament crimped yarn having a total fineness of 1270 dtex and 80 filaments.
The obtained crimped yarn had a single fiber fineness of 15.9 dtex. The crimp elongation of the crimped yarn after the boiling water treatment was 16.5% on average. Using the obtained crimped yarn, tufting was performed by adjusting the stitch so that the gauge basis weight was 1100 g / m ² by ordinary level cut, and dyeing and backing were performed according to a conventional method. At this time, in order to confirm the degree of the effect by forcibly generating vertical streaks, the heating rate of the dyeing bath was set to 10 ° C./min. Table 1 also shows the results of evaluation of the vertical streaks of the carpet thus obtained.

[Embodiment 2] Two groups of Y-shaped discharge holes having the configuration shown in FIG. 1 and having different shapes consisting of the slit length L, slit width W, slit depth D and the number of holes shown in Table 1. Using a spinneret having the following characteristics, a nylon 6 chip having a sulfuric acid relative viscosity of 2.8 is melt-spun by an extruder-type spinning machine at a discharge rate of 300 g / min. I got it. Here, Example 1
In order to minimize the effects of yarn sway and yarn collision as in the above, a discharge line that becomes a multifilament with a high degree of deformation is installed on the Uniflo Chimney side, and a straight line that separates each group of two groups of Y-shaped discharge holes with different shapes However, it was made to be perpendicular to the cooling air.

The degree of deformation of the two types of Y-shaped cross-section yarns obtained here was 4.0 and 2.1, and smooth yarn production was possible without single yarn collision. At this time, (Lj
× Ai × Wi ³ ) / (Li × Aj × Wj ³ ) value (X)
Is calculated to be 1.06.

It has two groups of Y-shaped deformation degrees aligned
The filament is then refueled, drawn, and subsequently wound.
Without removing it, this was published in JP-B-58-1214.
Using the described jet nozzle (JN) to impart crimp
, 1270 dtex, 80 filler
Thus, a crimped polyamide multifilament yarn was obtained.
The obtained crimped yarn has a single fiber fineness of 15.9 dtex.
Met. The crimp elongation of this crimped yarn after the boiling water treatment was flat.
The average was 16.5%. Using the obtained crimped yarn, usually
With a level cut of 1100 g / m ^TwoWhen
Adjust the stitch so that
Color and backing were implemented. At this time, force the vertical muscle
In order to confirm the degree of effect due to
The degree was 10 ° C./min. The mosquito obtained in this way
-Table 1 shows the results of the evaluation of the pet's "vertical muscle".
I will show you.

[Embodiment 3] Three groups of Y-shaped discharge holes having the configuration shown in FIG. 2 and having different shapes consisting of the slit length L, slit width W, slit depth D and the number of holes shown in Table 1. Using a spinneret having the following characteristics, a nylon 6 chip having a sulfuric acid relative viscosity of 2.8 is melt-spun by an extruder-type spinning machine at a discharge rate of 300 g / min. I got it. Here, in order to minimize the influence of the yarn sway and the collision of the yarn, the discharge hole of the base is located at an intermediate position between the discharge hole group (a) having the longest slit length and the discharge hole group (b) having the shortest slit length. A discharge hole group (k) having an intermediate slit length is arranged, and a discharge hole for obtaining a multifilament having the longest slit length, that is, a highly deformable multifilament is provided on the Uniflo chimney side in the case of yarn production. The parallel lines separating each group of the discharge holes were perpendicular to the cooling air.

The degree of deformation of the three types of Y-shaped yarns obtained here was 5.0, 4.0, and 1.9, and smooth yarn production was possible without single yarn collision. At this time, there are three values (X) of (Dj × Li × Wi ³ ) / (Di × Lj × Wj ³ ) in the spinneret, and 0.97,
1.08, 1.12 are calculated.

The aligned three groups of filaments having a Y-type deformation degree are then supplied with oil, stretched, and continuously wound without jetting them. And crimped to give a polyamide multifilament crimped yarn having a total fineness of 1400 dtex and 90 filaments.
The obtained crimped yarn had a single fiber fineness of 15.5 dtex. The crimp elongation of the crimped yarn after the boiling water treatment was 13.5% on average. Using the obtained crimped yarn, the vertical streak was evaluated using a carpet in the same manner as in Example 1. The results are shown in Table 1.

[Comparative Examples 1 to 3] In Example 1, the two groups of discharge holes are arranged in an annular shape as shown in FIG. 4 and Comparative Examples 1 and 2 are arranged as shown in FIG. The staggered arrangement was referred to as Comparative Example 2, and the arrangement of the three ejection holes in Example 3 was arranged in a three-row annular arrangement as Comparative Example 3, and the yarn was formed in the same manner as in the examples. For the example in which the sample of the crimped yarn was obtained, tufting, dyeing, and backing were performed, and the obtained carpet was evaluated for "vertical streaks." The results are also shown in Table 1. In all of Comparative Examples 1 to 3, since the single yarns having different degrees of deformation were adjacent to each other immediately after the ejection, the single yarns often collided, causing fluff and breakage, making it difficult to produce yarn. Particularly, Comparative Example 3 could not be wound.

[0059]

[Table 1]

[0060]

As described above, according to the spinneret of the present invention, a multifilament for a crimped yarn capable of producing a carpet with reduced generation of warpage can be produced by using two or three kinds of multifilaments having different ejection shapes. The yarn can be stably spun without causing a single yarn collision due to the yaw of the Y-shaped section yarn.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a spinneret according to the present invention.

FIG. 2 is a front view showing another example of the spinneret of the present invention.

FIG. 3 is an explanatory view showing an example of a Y-shaped discharge hole in the spinneret of the present invention.

FIG. 4 is a front view showing a configuration of a spinneret used in Comparative Example 1.

FIG. 5 is a front view showing a configuration of a spinneret used in Comparative Example 2.

[Explanation of symbols]

 A spinneret B Y-shaped discharge hole W slit width L slit length a discharge hole group with the longest discharge hole circumference b discharge hole group with the shortest discharge hole circumference c discharge hole group with an intermediate discharge hole circumference parallel lines

Claims (4)

[Claims] A spinneret having a plurality of two or three types of Y-shaped discharge holes each having a different shape in a single die, wherein the Y-shaped discharge holes having the same shape are gathered in this die. The arrangement of the group of each group of Y-shaped discharge holes having different
A spinneret characterized by being divided by one straight line or two straight lines that do not intersect on the surface of the spinneret. 2. A slit length La, a slit width Wa and a slit depth Da of a Y-type discharge hole a having the longest peripheral length of the two or three types of Y-type discharge holes. Length L in Y-shaped discharge hole b having a short length
b, the slit width Wb, the slit depth Db, and the slit length Lc, the slit width Wc, and the slit depth Dc of the Y-shaped discharge hole c having an intermediate peripheral length of the discharge hole are represented by the following expressions (1) and (2). 2. The spinneret according to claim 1, wherein 0.85 ≦ (Dj × Li × Wi ³ ) / (Di × Lj × Wj ³ ) ≦ 1.15 (1) (where (i, j) indicates any two combinations of abc. Of the two combinations, the longer one of the circumferences of the discharge holes is i, and the shorter one is j.) 1.3 ≦ La / Lb (2) 3. A slit width W in each of the Y-shaped discharge holes is in a range of 0.13 to 0.3 mm, and a slit depth D is in a range of 0.2 to 0.8 mm. Item 6. The spinneret according to item 1 or 2. 4. The apparatus according to claim 1, wherein said Y-shaped discharge holes are arranged at intervals of 10 mm or more.
The spinneret according to any one of the above.