JP2002339148A - Spinneret - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spinneret capable of stably giving, from single mouthpiece, multi-filaments which comprise a mixture of flat cross section multi- filaments with Y-type cross section multi-filaments and are used for a crimped yarn used for a carpet achieving a soft touch and sufficient impact resilience, bulkiness, and durability. SOLUTION: This spinneret having two kinds of nozzles for flat cross sections and Y-type cross sections in one spinneret is characterized in that the nozzles for the same cross sections are gathered, respectively, in the spinneret, wherein the two groups are divided with a line crossing the spinneret.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spinneret, and more particularly to a spinneret suitable for producing a crimped yarn for carpet. More specifically, the flat cross section multifilament and Y
The present invention relates to a spinneret for producing a crimped yarn in which multi-filaments having a mold section are mixed.

[0002]

2. Description of the Related Art The main purpose of use of carpets is to provide functions and atmospheres that are well suited to interior use. Various characteristics such as texture and volume, as well as colors and patterns, are required according to the application. Is done. Among these, carpets such as optional carpets, roll carpets, line carpets, and household carpets have been required to have excellent cushioning and high-grade feeling, as well as excellent interior space performance, particularly a uniform and calm atmosphere. Was.

[0003] Among these various properties, bulkiness, rebound resilience and durability have been sought first of all. Therefore, efforts have been made to increase bulkiness by using a modified cross-section yarn such as a Y-shaped cross-section yarn, and to increase rebound resilience by increasing a crimp level.

[0004] On the other hand, texture has not been given much importance so far. Rather, it can be said that the texture has been sacrificed in the process of pursuing bulkiness, resilience and durability. For example, in the above-mentioned method using a modified cross-section yarn to improve bulkiness, a carpet having a hard texture was obtained. In addition, the method of increasing the crimp level to increase the rebound resilience also results in a carpet having a hard texture, and in some cases a felt-like carpet.

[0005] Although carpets are basically stepped on by foot, in recent years, there has been a demand for improved texture, specifically, soft touch and good texture. For example, since a home carpet is placed in a living room or the like, it is assumed that the carpet may be laid down on the carpet, or the user may unconsciously stroke the surface of the mat while sitting on the carpet, and a soft texture is particularly strongly required.

Here, if only a soft feeling is to be pursued, a crimped yarn composed of a single yarn having a small secondary moment of area in the direction in which it is most bendable, such as a flat cross-section yarn, may be used. However, in that case, a carpet having insufficient bulkiness and rebound resilience will result.

Japanese Patent Application Laid-Open No. 2000-220050 discloses that a flat filament polyamide filament having a single-fiber fineness, flatness, and crimp elongation within a specific range is used. In addition, crimped yarns for carpets and carpets having excellent durability have been proposed. In this proposal, a soft texture is certainly obtained, and the single-fiber fineness, flatness, and crimp elongation are limited to a specific range, so that it is somewhat stiff and has some durability. The carpet was obtained. However, it was not satisfactory because it was composed only of the flat cross-section filaments.

[0008] Japanese Patent Publication No. 8-13287 and Japanese Patent No. 28
No. 53873 proposes a crimped yarn and a carpet for a carpet having a soft surface touch and a firm waist by combining multifilaments having different degrees of deformation and fineness. In the proposal, a certain degree of softening of the texture was recognized. However, since the cross-sectional shapes of the filament groups constituting the crimped yarn are all Y-shaped cross-sections, the soft feeling is limited, and further improvement is required.

Japanese Patent Application Laid-Open No. 9-157985 discloses a polyester for carpet obtained by mixing filaments having a cross section such as a triangular, irregular hollow, Y-shaped cross section, or square hollow with filaments having a cross section such as a flat cross section or a round cross section. A method for producing a fiber yarn has been proposed. From the fiber yarn obtained by the proposed method, a carpet having a softer feeling than that of the conventional carpet was obtained. However, since it is a crimped yarn made of polyester, the soft feeling was just one step away. In addition, since the fiber yarn is made of polyester, the carpet is unsatisfactory in terms of rebound resilience and durability.

Japanese Unexamined Patent Publication (Kokai) No. 63-120134 proposes a woven fabric using three or more kinds of cross-section yarns for a polyester-based multifilament. However, this proposal aims at bringing the texture closer to silk in the use of clothing, and there is no idea of improving the texture by applying it to a crimped yarn for carpet.

Japanese Patent Publication No. 1-2577 discloses an example of a carpet in which crimped yarns using polymers having different shrinkage characteristics are mixed to show the bulkiness and texture of a spun-like material. In the carpet, the production process is complicated because two kinds of polymers are used, and the durability of the crimped yarn is inferior because often a copolymer having a high copolymerization component is used as one kind of polymer. There was a problem. Although it was spun like, a soft texture was not obtained.

Further, the crimped yarn used for the tile carpet is obtained by mixing two or more kinds of crimped yarns having different dyeing properties by entanglement to create a carpet pattern. Here, crimped yarns in which the cross-sectional shape of a single fiber is different for each of the crimped yarns having different dyeing properties to be mixed are also proposed. However, in this example, the main purpose was to create a pattern thereby, and did not improve the texture. In addition, many confounds are given in order to express the handle, and although there is no problem as a loop, a converging portion remains in the cut pile, and the carpet has a poor volume feeling.

As described above, a crimped yarn for carpet and a carpet which can produce a new carpet having sufficient rebound resilience, bulkiness and durability while having a soft touch feeling have not been obtained.

On the other hand, Japanese Patent Application Laid-Open No. H08-113837 discloses a method for producing a polypropylene-based hetero-shrink mixed fiber.
There is a description that two kinds of polymers are introduced into a piece of base and the group of holes is discharged from the base. However, in that patent,
The purpose was to obtain a bulkier yarn, and the arrangement of the die holes was mainly in an annular arrangement, and there was no specific description about the die holes.

Japanese Unexamined Patent Publication (Kokai) No. 3-176005 proposes a crimped yarn in which two types of multifilaments having different degrees of deformation are combined.

[0016]

SUMMARY OF THE INVENTION The present inventors have found that by using a crimped yarn in which a flat cross-section multifilament and a Y-shaped cross-section multifilament are mixed, sufficient rebound resilience and bulkiness can be achieved while maintaining a soft touch feeling. A crimped yarn for carpet having good properties and durability was proposed first. This crimped yarn uses a flat cross-section multifilament having a flatness within a specific range, and a Y-shaped cross-section multifilament having a deformation degree within a specific range, and is made of polyamide, so that it has a soft touch feeling. Sufficient rebound resilience, bulkiness,
It achieves durability and achieves high effects.

Further, as a method of manufacturing the same, a die having a plurality of two types of discharge holes for a flat cross section and a Y type cross section in a single die is used. It is described that a crimped yarn can be obtained.
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 die discharge holes. It was found that there were many single yarn collisions at the time and the process became unstable.

In other words, when a plurality of types of filaments having different cross-sectional shapes and single fiber finenesses are simultaneously spun with a single die, it has been difficult to stably produce yarns up to now. No proposal for a spinneret to solve this problem has been made so far.

In the production method described in JP-A-3-176005, multifilaments are obtained by combining filaments produced by using different spinning machines, and
There is no specific description on a die for obtaining two kinds of filaments having different degrees of deformation with one die. Further, this proposal relates to a combination of two types of Y-shaped cross-section filaments having different degrees of deformation, and does not relate to a combination of a flat cross-section filament and a Y-shaped cross-section filament.

In any case, for a crimped yarn for a carpet to achieve sufficient rebound resilience, bulkiness, and durability while having a soft touch feeling, one base has a flat cross section,
A spinneret having two types of discharge holes for a Y-shaped cross section has not been proposed.

The present invention has been achieved as a result of studying the problem of solving the above-mentioned problems in the prior art. Therefore, an object of the present invention is to provide a flat cross-section multifilament and a Y-shaped cross-section multifilament for a carpet crimped yarn that achieve sufficient rebound resilience, bulkiness, and durability while having a soft touch feeling. An object of the present invention is to provide a spinneret for obtaining a multifilament from a single spinneret.

[0022]

In order to solve the above problems, the spinneret of the present invention mainly has the following constitution.
That is, a spinneret having a plurality of two types of discharge holes for a flat cross section and a Y-shaped cross section in a single die, and the discharge holes for the same cross section are gathered in the die. Is a spinneret which is divided by a line crossing the spinneret.

In the present invention, the discharge hole for flat cross section is
A base formed in a shape in which a plurality of equal circles arranged at equal intervals are connected by a slit, the number Na of circles of the flat-section discharge holes, the circle diameter φa, the interval La between the circles, the slit width Wa, It is preferable that the slit length Lb and the slit width Wb of the discharge hole for the Y-shaped section satisfy the following expressions (1) to (4). (1) 3 ≦ Na ≦ 8 (2) 1.25 ≦ La / φa ≦ 2.0 (3) 0.25 ≦ Wa / φa ≦ 0.5 (4) 0.6 ≦ Lb / Wb ≦ 12.

Further, in the present invention, the number Na of circles, the diameter φa, the interval La between the circles, the slit width Wa, the slit depth Da, the slit length Lb of the discharge hole for the Y-shaped section, the slit width It is also preferable that Wb and the slit depth Db satisfy the following expression (5). (5) 1.5 [{Naφa ⁴ / (10 Da)} + ｛(N
a-1) Wa ³ (La−φa) / (3Da)｝] ≦ Wb ³
Lb / Db

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the drawings. FIG. 1 is a front view showing an example of the spinneret of the present invention, FIGS. 2 to 4 are front views showing another example of the spinneret of the present invention, and FIG. 5 is an example of a spinneret as a comparative example different from the present invention. FIG. 6 is an explanatory view showing an example of a discharge hole for a flat section in the spinneret of the present invention, and FIG. 7 is an explanatory view showing an example of a discharge hole for a Y-shaped section.

In the spinneret shown in FIG. 1, a single die A has a plurality of discharge holes B for a flat cross section and a plurality of discharge holes C for a Y-shaped cross section. The holes are gathered, and these two sets are separated by one straight line D. Here, the spinneret shown in FIG. 1 has a spinneret arrangement in which the direction of the cooling air and the straight line D are perpendicular.

In the spinneret shown in FIGS. 2 to 4, similarly to FIG. 1, a single die A has a plurality of discharge holes B for a flat cross section and a plurality of discharge holes C for a Y-shaped cross section. Yes,
Also, discharge holes for the same cross section are gathered, and these two gatherings are separated by a line D crossing the base.
Here, the spinneret shown in FIG. 2 has a spinneret arrangement in which the direction of the cooling air and the straight line D are parallel. The spinnerets shown in FIGS. 3 and 4 are separated by a line D crossing the spinneret.

In the drawing, all the discharge holes B for the flat cross section and the discharge holes C for the Y-shaped cross section in the spinneret A are not shown, and are not shown. In the figure, a straight line D that divides a set of two discharge holes is shown by a solid line.
This is written for clarity, and there is no straight line in the actual base.

In the spinneret of the present invention, it is necessary that one spinneret has a plurality of two types of discharge holes for a flat cross section and a Y-shaped cross section, respectively. By mixing flat section filaments and Y-shaped section filaments, sufficient rebound resilience, bulkiness,
A multifilament which becomes a crimped yarn for carpet for achieving durability can be obtained. The shape of the base surface is arbitrary such as a circle, a square, and a rectangle, but is generally a circle.

In the spinneret of the present invention, it is necessary that discharge holes for the same cross section are gathered. In the case where one die has two types of discharge holes, there is a difference in the cooling state due to a difference in the single hole discharge amount and shape in each cross section, and a difference in spinning tension in each discharged cross section. That is, in the cooling process immediately after the spinning, the state of the yarn swaying or the extent of the overhang of the yarn due to the cooling air differs for each cross section. Here, when discharge holes for the same cross section are aggregated, a plurality of single fibers exhibit the same behavior in each aggregate, so that stable spinning becomes possible. On the other hand, as shown in FIG. 5 which is a comparative example different from the present invention, in the case of a die in which discharge holes having different discharge hole shapes are arranged randomly or interleaved without being gathered, yarn sway and yarn Stable spinning is difficult because of the frequent overhang of single yarns.

Further, in the spinneret of the present invention, it is necessary that a set of discharge holes for each of the cross section for the flat cross section and the Y-shaped cross section is separated by a line crossing the spinneret. That is, even if the ejection holes for the same cross section are gathered as described above, if the arrangement is, for example, concentric, the interference of the yarn at the boundary between the two ejection hole groups cannot be suppressed so much. .

However, by dividing the set of ejection holes for the same cross section by lines as in the present invention, it is possible to more effectively suppress the yarn interference at the boundary between the two ejection hole groups. It becomes.

In the spinneret as an example of the present invention shown in FIGS. 3 and 4, the line D is a curved or meandering curve. Thus, the line D may be a curve or a straight line.

In the spinneret of the present invention, the discharge hole for flat cross section is a die formed by connecting a plurality of equal circles arranged at equal intervals by slits, and the discharge hole for flat cross section is formed. Number of circles Na, circle diameter φa, distance L between circles
a, slit width Wa, slit length L of discharge hole for Y-shaped section
b, the slit width Wb preferably satisfies the following expressions (1) to (4). (1) 3 ≦ Na ≦ 8 (2) 1.25 ≦ La / φa ≦ 2.0 (3) 0.25 ≦ Wa / φa ≦ 0.5 (4) 0.6 ≦ Lb / Wb ≦ 12 The circular diameter φa of the flat-hole discharge hole, the interval La between the circles,
The slit width Wa, the slit length Lb of the discharge hole for the Y-shaped section,
The slit width Wb is a length parameter indicating each part of the discharge hole shown in FIG. 6 or FIG. The number of circles Na of the flat-section discharge holes is the number of circles forming the flat-section discharge holes.

In the spinneret of the present invention, the shape of the discharge hole for forming a flat cross-section single fiber is arbitrary. However, it is not a flat cross section of a lens type with a raised center, but a flat cross section with a stable thickness, a die can be manufactured relatively inexpensively, and the spinning is stable. It is preferable that a plurality of equal circles arranged at equal intervals are connected by a slit.

When the number of circles, the circle diameter, the interval between circles, and the slit width of the flat section discharge holes satisfy the formulas (1) to (3),
The flatness of the flat cross section single fiber is about 2.0 or more and 7.0 or less. When the slit length and slit width of the Y-shaped cross section discharge hole satisfy the formula (4), the degree of deformation of the Y-shaped cross section single fiber is about 2.0 or more and 6.0 or less. In a crimped yarn of a multifilament spun using this die, a difference in the crimp level occurs between a flat cross-section single fiber and a Y-shaped cross-section single fiber. Then, single fibers having a flat section having a low crimp level appear on the cut pile surface of the carpet, and single fibers having a Y-shaped section having a high crimp level sink in the cut pile. Therefore, a soft touch feeling can be obtained, which is preferable.

In the spinneret of the present invention, the number Na of circles, the diameter φa, the distance La between the circles of the discharge holes for flat cross section,
Slit width Wa, slit depth Da, slit length Lb of Y-shaped section discharge hole, slit width Wb, slit depth Db
However, it is also preferable that the following formula (5) is satisfied. (5) 1.5 [{Naφa ⁴ / (10 Da)} + ｛(N
a-1) Wa ³ (La−φa) / (3Da)｝] ≦ Wb ³
Lb / Db Here, the slit depth Da of the discharge hole for the flat cross section and the slit depth Db of the discharge hole for the Y-shaped cross section respectively indicate the thickness of the slit of the discharge hole.

The number, circle diameter, interval between circles, slit width, slit depth, slit length, slit width, and slit depth of the discharge hole for a Y-shaped section satisfy the formula (5). In this case, the single fiber fineness of the Y-shaped cross-sectional filament is about 1.5 times or more the single fiber fineness of the flat cross-sectional filament. In this case, both the soft touch feeling and the rebound resilience, the bulkiness, and the durability are at high levels, which is preferable.

In the present invention, a discharge hole for a cross section having a small single hole discharge amount such that a straight line dividing a set of discharge holes for a flat cross section and a discharge section for a Y-shaped cross section is perpendicular to the wind direction of the uniflow chimney. It is preferable that the spinneret is arranged and spinning is performed so that the set of the spinnerets is on the uniflow chimney side. By arranging and spinning such that the positional relationship between the die and the uniflow chimney is as described above, it is possible to realize a stable spinning in which the interference of the yarn at the boundary between the two discharge hole groups is most unlikely to occur.

When the discharge amount of the single hole is the same between the discharge holes of different cross sections, it is preferable to arrange a set of discharge holes of Y-shaped cross section on the uniflow chimney side and spin. Also in this case, the interference of the yarn at the boundary between the two ejection hole groups can be minimized.

The filament thus stably spun is supplied with oil, stretched and crimped by a known method, and then wound up to finally form a crimped yarn.

[0042]

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.

[Relative Viscosity of Sulfuric Acid] 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] A cross-sectional photograph of the crimped yarn was taken and enlarged and copied to about A3 size. Next, all the monofilaments printed on the copy paper were cut with scissors, and the weight of the cut paper for all the monofilaments for each of the cross-sectional types of the flat cross section and the Y-shaped cross section was measured with an electronic balance. Here, assuming that the weight of the flat cross section single fiber group is A, the number of holes is D, the weight of the Y-shaped cross section single fiber group is B, the number of holes is E, and the total fineness of the crimped yarn is C, the single fineness of the flat cross section is = C × A / {(A + B) × D} Single fiber fineness of Y-shaped section = C × B / {(A + B) × E}.

[Crimp elongation rate after boiling water treatment] Room temperature 25
A crimped yarn unwound from a package that had been left in an atmosphere at 60 ° C. and a relative humidity of 60% for 20 hours or more was immersed in boiling water for 30 minutes in a no-load state, and then dried to an equilibrium moisture content. After boiling water treatment, use as a sample of crimped yarn. An initial load of 1.8 mg / dtex (2 mg / d) is applied to this sample yarn, and after 30 seconds, marking is performed on a sample length of 50 cm (L ₁ ). Next, 90 mg / dtex was added to the sample.
(30 mg / d) after a constant load of 30 seconds.
The extended sample length (L ₂ ) is measured. Next, the crimp elongation rate (%) is determined by the following equation. Crimp elongation rate (%) = [(L ₂ −L ₁ ) / L ₁ ] × 100 The atmosphere conditions when leaving the yarn before the boiling water treatment are as follows when the yarn is used in the actual carpet manufacturing process. The crimped yarn state, that is, the 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.

[Flatness of Flat Cross-Section Yarn] A photograph of a cross-section of a crimped yarn is enlarged, and the ratio of the long side to the short side of the smallest rectangle covering the cross section is defined as flatness. It calculated as the average value of the measurement of five single fibers.

[Degree of Deformation of Y-Shaped Yarn] The cross-sectional photograph of the crimped yarn is enlarged, and the ratio of the diameters of the circumscribed circle and the inscribed circle is defined as the degree of deformation. It calculated as the average value of the measurement of five single fibers.

[Comprehensive Evaluation of Carpet] Compatibility as a carpet was relatively comprehensively evaluated as follows. …: Extremely good suitability…: good suitability △: slightly poor suitability ×: poor suitability

[Yarn-forming property (thread breakage)]
2,000 kg of spinning was performed, and the evaluation was made according to the state of yarn breakage during the spinning. △ or more is a pass. …: Extremely good ○: Excellent △: Occasionally thread breakage ×: Frequent thread breakage XX: Extremely frequent thread breakage.

Example 1 Each of the discharge holes for the flat cross section and the Y-shaped cross section uses a single die which is perforated in a set of arrangement as schematically shown in FIG. The base was arranged such that the cooling air of the Uniflow chimney hit in the same direction. Then, a chip of nylon 6 having a sulfuric acid relative viscosity of 2.8 was melt-spun with an extruder-type spinning machine, so that a flat-section filament and a Y-section filament were simultaneously obtained with a single die. Here, the number of circles, the diameter of the circle, the interval between the circles, the slit length, the slit width, the slit depth, the slit length, the slit width, and the slit depth for the discharge for the Y-shaped cross section are described in Table 1. As expected.

The two groups of spun yarns are cooled, solidified, and then immediately aligned, then refueled, stretched, and subsequently rolled without being wound using a jet nozzle (JN). Then, a polyamide multifilament crimped yarn having a total fineness of 1300 dtex and 96 filaments was obtained. Before winding, slight confounding was applied. The resulting crimped yarn has an average crimp elongation of 16.0 after boiling water treatment.
%, The number of confounds was 10 pieces / m.

The flat cross section filament has a flatness of 4.5, a fineness of 650 dtex, a single yarn number of 64, a single fiber fineness of 10.2 dtex, and a Y-shaped cross section filament has a deformation degree of 4.0, a fineness of 650 dtex, and a single yarn number of 32. The single fiber fineness was 20.3 dtex.

Next, the obtained crimped yarn was tufted by adjusting the stitches so as to obtain 1/10 gauge, pile height of 6 mm and basis weight of 1100 g / m ² by ordinary level cutting. Thereafter, staining and backing were performed according to a conventional method. Table 1 shows the overall evaluation of the carpet thus obtained and the results of the spinnability at the time of producing the crimped yarn.

Example 2 Each of the discharge holes for the flat cross section and the Y-shaped cross section uses a single die which is perforated in a set of arrangement as schematically shown in FIG. 2, and is shown in FIG. In the same manner as in Example 1 except that the base was arranged so that the cooling air of the
A crimped polyamide multifilament yarn of 0 dtex and 96 filaments was obtained. The resulting crimped yarn has an average crimp elongation of 16.0% after boiling water treatment, and the number of entanglements is 10 / m.
Met.

Here, the flat cross section filament has a flatness of 4.5, a fineness of 650 dtex, a single yarn number of 64, a single fiber fineness of 10.2 dtex, and a Y-shaped cross section filament has a deformation degree of 4.0, a fineness of 650 dtex, and a single yarn number of 32. The single fiber fineness was 20.3 dtex.

Next, the obtained crimped yarn was tufted by adjusting the stitch so that the level was 1/10 gauge, the pile height was 6 mm, and the basis weight was 1100 g / m ² by ordinary level cutting. Thereafter, staining and backing were performed according to a conventional method. Table 1 shows the overall evaluation of the carpet thus obtained and the results of the spinnability at the time of producing the crimped yarn.

[Embodiment 3] Each of the discharge holes for the flat cross section and the Y-shaped cross section uses one die which is perforated in a set of arrangement as schematically shown in FIG. In the same manner as in Example 1 except that the base was arranged so that the cooling air of the
A crimped polyamide multifilament yarn of 0 dtex and 96 filaments was obtained. The resulting crimped yarn has an average crimp elongation of 16.0% after boiling water treatment, and the number of entanglements is 10 / m.
Met.

Here, the flat cross section filament has a flatness of 4.5, a fineness of 650 dtex, a single yarn number of 64, a single fiber fineness of 10.2 dtex, and a Y-shaped cross section filament has a deformation degree of 4.0, a fineness of 650 dtex, and a single yarn number of 32. The single fiber fineness was 20.3 dtex.

Then, the obtained crimped yarn was tufted by adjusting the stitch so that the level was 1/10 gauge, the pile height was 6 mm, and the basis weight was 1100 g / m ² by ordinary level cutting. Thereafter, staining and backing were performed according to a conventional method. Table 1 shows the overall evaluation of the carpet thus obtained and the results of the spinnability at the time of producing the crimped yarn.

[Embodiment 4] Each of the discharge holes for the flat cross section and the Y-shaped cross section uses a single die which is perforated in a set of arrangement as schematically shown in FIG. In the same manner as in Example 1 except that the base was arranged so that the cooling air of the
A crimped polyamide multifilament yarn of 0 dtex and 96 filaments was obtained. The resulting crimped yarn has an average crimp elongation of 16.0% after boiling water treatment, and the number of entanglements is 10 / m.
Met.

Here, the flat cross section filament has a flatness of 4.5, a fineness of 650 dtex, a single yarn number of 64, the single fiber fineness is 10.2 dtex, and the Y-shaped cross section filament has a deformation degree of 4.0, a fineness of 650 dtex, and a single yarn number of 32. The single fiber fineness was 20.3 dtex.

Next, the obtained crimped yarn was tufted by adjusting the stitches so that a 1/10 gauge, a pile height of 6 mm and a basis weight of 1100 g / m ² were obtained by ordinary level cutting. Thereafter, staining and backing were performed according to a conventional method. Table 1 shows the overall evaluation of the carpet thus obtained and the results of the spinnability at the time of producing the crimped yarn.

Example 5 A polyamide multifilament crimped yarn having a total fineness of 1300 dtex and 96 filaments was obtained in the same manner as in Example 1 except that the slit shape was changed as shown in Table 1. The resulting crimped yarn has an average crimp elongation after boiling water treatment of 23.0% and an entangling number of 12
Pieces / m.

Here, the flat cross section filament has a flatness of 4.5, a fineness of 800 dtex and a single yarn number of 54, the single fiber fineness is 14.8 dtex, and the Y-shaped cross section filament has a deformation degree of 4.0, a fineness of 500 dtex and a single yarn number of 34. The single fiber fineness was 14.7 dtex.

Next, the obtained crimped yarn was tufted by adjusting the stitches so as to obtain 1/10 gauge, pile height of 6 mm, and basis weight of 1100 g / m ² by ordinary level cutting. Thereafter, staining and backing were performed according to a conventional method. Table 1 shows the overall evaluation of the carpet thus obtained and the results of the spinnability at the time of producing the crimped yarn.

As is evident from the results shown in Table 1, in the examples of the present invention, all the spinnerets had good yarn-making properties.

[Comparative Example 1] Each of the discharge holes for the flat cross section and the Y-shaped cross section uses a single die which is perforated in a set of arrangement as schematically shown in FIG. 5, and is shown in FIG. In the same manner as in Example 1 except that the base was arranged so that the cooling air of the
A crimped polyamide multifilament yarn of 0 dtex and 96 filaments was obtained. The resulting crimped yarn has an average crimp elongation of 16.0% after boiling water treatment, and the number of entanglements is 10 / m.
Met.

Here, the flat cross section filament has a flatness of 4.5, a fineness of 650 dtex and a single yarn number of 64, the single fiber fineness is 10.2 dtex, and the Y-shaped cross section filament has a deformation degree of 4.0, a fineness of 650 dtex and a single yarn number of 32. The single fiber fineness was 20.3 dtex.

Next, the obtained crimped yarn was tufted by adjusting the stitches so as to obtain 1/10 gauge, pile height of 6 mm and basis weight of 1100 g / m ² by ordinary level cutting. Thereafter, staining and backing were performed according to a conventional method. Table 1 shows the overall evaluation of the carpet thus obtained and the results of the spinnability at the time of producing the crimped yarn.

[Comparative Example 2] A total fineness of 1 was obtained in the same manner as in Example 1 except that each of the discharge holes for the flat cross section and the Y-shaped cross section was formed of a single die which was annularly arranged and perforated.
A polyamide multifilament crimped yarn of 300 dtex and 96 filaments was obtained. The resulting crimped yarn had an average crimp elongation of 16.0% after boiling water treatment, and the number of entanglements was 10 / m.

Here, the flat cross section filament has a flatness of 4.5, a fineness of 650 dtex and a single yarn number of 64, the single fiber fineness is 10.2 dtex, and the Y-shaped cross section filament has a deformation degree of 4.0, a fineness of 650 dtex and a single yarn number of 32. The single fiber fineness was 20.3 dtex.

Next, the obtained crimped yarn was tufted by adjusting the stitches so as to obtain 1/10 gauge, pile height of 6 mm and basis weight of 1100 g / m ² by ordinary level cutting. Thereafter, staining and backing were performed according to a conventional method. Table 1 shows the overall evaluation of the carpet thus obtained and the results of the spinnability at the time of producing the crimped yarn.

In Comparative Example 1, the adjacent intermingled flat cross-section single fibers and Y-shaped cross-section single fibers interfered with each other, and the yarn-forming property was impossible. Further, in Comparative Example 2, since there was a part interfering between the single fiber group having a flat cross section and the single fiber group having a Y-shaped cross section arranged in a ring shape, it was impossible to form yarn.

[0075]

[Table 1]

[0076]

According to the present invention, a flat cross-section multi-filament and a Y-shaped cross-section multi-filament for a carpet crimped yarn which achieves sufficient rebound resilience, bulkiness and durability while having a soft touch feeling are provided. A spinneret capable of stably obtaining mixed multifilaments from one spinneret is obtained.

[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 a front view showing another example of the spinneret of the present invention.

FIG. 4 is a front view showing another example of the spinneret of the present invention.

FIG. 5 is a front view showing a configuration of a spinneret as a comparative example different from the present invention.

FIG. 6 is a front view showing an example of a discharge hole for a flat cross section in the spinneret of the present invention.

FIG. 7 is a front view showing an example of a discharge hole for a Y-shaped cross section in the spinneret of the present invention.

[Explanation of symbols]

 A spinneret B discharge hole for flat cross section C discharge hole for Y-shaped cross section D Straight line that separates a set of two discharge holes

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4L045 AA05 BA03 BA12 BA16 BA41 BA46

Claims (3)

[Claims] 1. A die having a flat base and a Y-shaped cross section.
This is a spinneret having a plurality of types of discharge holes, each having a plurality of discharge holes for the same cross section.
A spinneret, wherein two sets are separated by a line across the spinneret. 2. A die having a flat-section discharge hole formed in a shape in which a plurality of equal circles arranged at equal intervals are connected by a slit, wherein the number of circles of the flat-section discharge hole is Na,
2. The method according to claim 1, wherein a circle diameter φa, an interval between circles La, a slit width Wa, a slit length Lb and a slit width Wb of the discharge hole for the Y-shaped section satisfy the following expressions (1) to (4).
The spinneret according to 1. (1) 3 ≦ Na ≦ 8 (2) 1.25 ≦ La / φa ≦ 2.0 (3) 0.25 ≦ Wa / φa ≦ 0.5 (4) 0.6 ≦ Lb / Wb ≦ 12 3. The number of circles Na and the diameter φ of the discharge holes for a flat section.
a, spacing between circles La, slit width Wa, slit depth D
a, slit length Lb, slit width W of discharge hole for Y-shaped section
3. The spinneret according to claim 2, wherein b and the slit depth Db satisfy the following expression (5). (5) 1.5 [{Naφa ⁴ / (10 Da)} + ｛(N
a-1) Wa ³ (La−φa) / (3Da)｝] ≦ Wb ³
Lb / Db