JP2002069766A - Crimped yarn for carpet and carpet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crimped yarn for a carpet, capable of suppressing the formation of wale streaks in a carpet, especially a cut-pile carpet with a light color without damaging the feeling. SOLUTION: This crimped yarn comprises mixed two kinds of multifilament yarns with Y-shaped cross sections having >=1.5 times differences in modified degrees, or three kinds of the multi-filament yarns with the Y-shaped cross sections having >=1.2 times differences from each other, and has the substantially same single filament size and <=20/m number of interlaces. Further the crimped yarn is made from the same polymer. The carpet is obtained by using the crimped yarn for the carpet as a pile.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a crimped yarn used for a carpet and a carpet using the crimped yarn. More specifically, a crimped yarn for a carpet, which can suppress the occurrence of warping lines often seen in a carpet, particularly a light-colored cut pile carpet, without impairing the texture, and a carpet having no warping line using the crimped yarn It is about.

[0002]

2. Description of the Related Art The main purpose of using carpets is to provide an atmosphere that is well suited for interior use. Therefore, various characteristics such as texture, touch, and volume, as well as colors and patterns, are used. Is required depending on the application.

[0003] In particular, carpets such as optional carpets, roll carpets and line carpets are required to have excellent cushioning and high-grade feeling, as well as to produce a good interior space, and in particular to have a uniform and calm atmosphere. As a result, these carpets are often made of light color that does not get tired.

[0004] On the other hand, carpets are manufactured by tufting several hundred to 2,000 crimped yarns substantially parallel to a 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.

[0005] The causes of the above vertical muscles are as follows.
There are mainly two types of factors: morphological differences and dyeing differences. The vertical streaks caused by the morphological difference is a phenomenon in which, 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 the streaks are visible. . On the other hand, the vertical streaks caused by the difference in dyeing are different in the degree of dye adsorption when carpet is dyed, because the fiber structure of the crimped yarns constituting the pile differs depending on the pile, and this is recognized as streaks. is there. 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 warp 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 the properties of the wound crimped yarn between the inner layer and the outer layer of the cheese, the winding tension may be reduced, or as described in Japanese Patent Publication No. 57-2627, for example. 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 defining a heat shrinkage rate and a preheating temperature at the time of applying a crimp in a crimp 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.

[0009] Even if the crimped yarn once formed is subjected to some abnormal tension on a part of the crimped yarn in the processing step of rewinding or dyeing and the crimped yarn is partially expanded, 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.

Japanese Patent Publication No. 63-16487 discloses a method of 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.

Although various improvement proposals as described above have been made, all of these proposals are intended to reduce the warp by making a more uniform crimped yarn. However, the improvement effect was limited.

Further, Japanese Patent Publication No. 8-132287 and Japanese Patent No. 2853873 disclose a crimped yarn for a carpet having a soft surface touch and a firm waist by combining multifilaments having different degrees of deformation and fineness. In addition, a method for obtaining a carpet has been proposed. However, in this proposal, since the fineness of the single yarn constituting each of the multifilaments to be mixed is greatly different, the texture of the obtained carpet is changed, but the effect of reducing the vertical streak was not recognized.

Further, not only one color but also similar two colors of piles are used to form a pile or twisted saxony to reduce vertical streak. However, all of these methods can be used only in a limited range in terms of required quality and standards.

On the other hand, Japanese Patent Application Laid-Open No. 63-120134 proposes a woven fabric using three or more kinds of cross-section yarns for polyester-based multifilaments. The purpose is to bring the fiber closer to silk, and there is no mention of the idea of applying this fiber to a crimped yarn for carpet to reduce warp.

In Japanese Patent Publication No. 23577/1990,
There has been proposed an example in which crimped yarns using polymers having different shrinkage properties are mixed to form a carpet exhibiting bulkiness and texture of spunlike.

[0016]

In this carpet, since the tip of the pile is oriented in various directions, the effect is also recognized to a certain extent in terms of reducing vertical streaks. The production process is complicated, and the use of a copolymer having a high copolymerization component as one kind of polymer has a problem that the durability of the crimped yarn is poor.

Further, in the crimped yarn used for tile carpets, two or more kinds of crimped yarns having different dyeing properties are mixed and entangled to create a carpet pattern. Here, there is also proposed one in which the cross section of the single yarn is different for each of the crimped yarns having different dyeability to be mixed. However, in this example, the polymer used itself was different, and the purpose was to create a pattern by using the polymer, and the vertical streak was not reduced. In addition, high confounding is applied in order to express the handle, and although there is no problem as a loop, a converging portion remains in the cut pile, resulting in a carpet with a poor volume feeling. In addition, Japanese Patent Publication No. 2-3577 has no idea that crimped yarns made of the same polymer are mixed with crimped yarns having a certain degree of deformation to reduce the warp.

The present invention has been achieved as a result of studying solving the problems in the prior art described above as a problem.

Accordingly, an object of the present invention is to use a crimped yarn capable of suppressing the occurrence of warp streaks which are often seen in carpets, particularly light-colored cut pile carpets, without impairing the feeling and a crimped yarn. It is to provide a carpet without a vertical line.

[0020]

In order to solve the above-mentioned problems, a crimped yarn for carpet of the present invention has two groups of Y-shaped cross sections having the same polymer and different in the degree of deformation by 1.5 times or more. A crimped yarn in which filament yarns are mixed, or a multi-filament yarn in which three groups of Y-shaped cross sections which are made of the same polymer and have different degrees of deformation from each other by 1.2 times or more are mixed, wherein each of the multifilaments is The fineness of the single yarn constituting the yarn is substantially the same, and the number of entanglements is 2
0 / m or less.

In the crimped yarn for carpet of the present invention, the following (1) to (4) are each preferable embodiments. (1) The fineness of the multifilaments in each group is substantially the same. (2) The total fineness of the crimped yarn is 600 to 2500 decitex. (3) The crimp elongation of the crimped yarn after boiling water treatment is 5 to 28%.
That. (4) The polymer constituting the crimped yarn is polyamide.

In the carpet of the present invention, the above-mentioned crimped yarn for carpet is 80% of the pile constituting the carpet.
It is characterized by using the above. And in the carpet of this invention, the following (5)-(6) are each mentioned as a preferable aspect. (5) The carpet is one of an optional carpet, a roll carpet and a line carpet. (6) The pile is non-twisted and cut pile.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in more detail. The crimped yarn for carpet in the present invention,
It is a crimped yarn in which two groups of Y-shaped cross-section yarns whose deformation degrees differ by 1.5 times or more, or three groups of Y-shaped cross-section yarns whose mutual deformation degrees differ by 1.2 times or more are mixed. Each group is characterized in that it is an aggregate of filament yarns having the same single yarn cross section, and is a multifilament yarn in which the fineness of the constituent single yarns is substantially the same. That is, by mixing two or three types of multifilament yarns having a specific cross-sectional shape or fineness configuration, the carpet pile can be appropriately dispersed when formed into a pile, and the carpet can be made less likely to be vertical streaks. is there.

Here, in the case of two groups of multifilament yarns, the difference in the degree of deformation is 1.5 or more, preferably 1.
It needs to be 8 or more. If the difference in the degree of deformation is less than the above range, the difference between the groups is small, and the effect of reducing the vertical streaks due to appropriate variation cannot be exhibited. Also,
In the case of three groups of multifilament yarns, the difference in the degree of deformation must be 1.2 or more, preferably 1.5 or more. When the difference in the degree of deformation is less than the above range, the difference between the groups is small as in the case of the two groups, and the effect of reducing the vertical streaks due to moderate variation is not exhibited.

As described above, the crimped yarn for a carpet in the present invention needs to include a multifilament yarn having a Y-shaped single yarn cross section. Here, the Y-shaped cross section is 3
There is no particular limitation as long as it is a cross section having a protrusion in the direction. For example, a cross section having a protrusion in three directions as shown in FIG. 1 of Japanese Patent Publication No. 2-8044 is similar without particular limitation. Can be used. The three protrusions create a volume and bulkiness as a pile and create excellent cushioning. In the case of a Y-shaped cross section, the fiber may have one or more hollow portions. When compared with the same fineness as having a hollow portion, it is possible to occupy an apparent occupied volume in the carpet, and a carpet with high bulkiness can be obtained.

In the present invention, the degree of deformation of the Y-shaped section yarn is a numerical value (diameter of circumscribed circle / inscribed circle) calculated from the ratio of the diameter of the circumscribed circle to the diameter of the inscribed circle by sketching the cross section of the single yarn. Diameter). As described above, the Y-shaped cross-section yarn needs to have a certain difference depending on each group.
A range from 5 to 5.0 is preferred. By setting the degree of deformation in this range, a crimped yarn having an even more voluminous feel can be stably produced.

In the crimped yarn for carpet of the present invention, it is necessary that the fineness of the single yarn of the mixed multifilament yarn is substantially the same. The term “substantially the same” as used herein means that the variation in single yarn fineness, particularly the difference in single yarn fineness between groups having different degrees of deformation is within 15%, more preferably within 10%. When the difference in single yarn fineness between each group is more than 15%, the characteristics of the crimped yarn having high single yarn fineness become dominant on the surface of the carpet, and the dispersion effect as a pile when formed into a carpet is low. , No vertical muscle reduction effect is exhibited. The texture is also dominated by high-fineness filaments, often resulting in a hard texture.

The mixed yarn disclosed in Japanese Patent No. 2853873 described above greatly changes the fineness of a single yarn in each group for the purpose of producing a deep color with a soft touch. In this respect, they are significantly different from those known examples.

It is an essential requirement that the crimped yarn for carpet of the present invention has an entanglement number of 20 / m or less.
If the number of confounds exceeds 20 pieces / m, the convergence is so strong that the volume feeling of a carpet is impaired, which is not preferable. In particular, in the case of a cut pile, there is a problem that entanglement often remains, resulting in a carpet having a hard texture and being transparent through the ground.

The essential requirement of the crimped yarn for carpet of the present invention is that two or three groups of multifilament yarns having different degrees of deformation are composed of the same polymer. Here, the same polymer means that the polymers used in the spinning stage are the same. If the polymer type is changed for each group having a different degree of deformation, the manufacturing process becomes complicated, and the gloss and the dyeability of each group are different. In this case, the effect of reducing the vertical streaks, which is caused by the presence of the surface, is reduced.

In the crimped yarn for carpet of the present invention, it is preferable that the fineness of the multifilament yarn in each group is substantially the same. The term "substantially the same" as used herein means that the ratio of the fineness of the multifilament yarns of each group is within 10%. When the ratio of the fineness of the multifilament yarns in each group does not exceed 10%, the characteristics of the two or three groups having different degrees of deformation are averaged and appear on the surface of the carpet, and the effect of reducing the vertical streaks is more effectively achieved. Will be expressed.

The total fineness of the crimped yarn for carpet of the present invention is as follows:
Preferably it is 600-2000 dtex, more preferably 1000-1800 dtex. By setting the total fineness in this range, there is no need to provide a threading step necessary to maintain the basis weight of the carpet, and it is not necessary to adjust gauges and stitches. Not a stable carpet can be obtained.

The single fiber fineness of the crimped yarn for carpet of the present invention is not particularly limited, but is preferably 5 to 30 dtex, more preferably 10 to 20 dtex. By setting the single fiber fineness to the above range, stable yarn production without collision of single yarns in the yarn production process can be obtained, and a pile with good waist can be obtained without pile pile breakage and durability. It is possible to obtain a carpet excellent in wear and abrasion.

Further, the crimped yarn for carpet of the present invention comprises:
The crimp elongation after boiling water treatment is 5 to 28%, especially 10 to 2
Preferably it is in the range of 4%. By setting the crimp elongation in such a range, it is possible to obtain a carpet having a better volume feeling and a better texture as the crimping property is enhanced.

In the crimped yarn to which crimping is applied, even if the elongation after boiling water treatment exceeds 28%, for example, as described in JP-B-60-47949, the crimped material The yarn may be heat-treated under a low tension while being unwound in a separate process, or may be heat-treated in a cheese state to reduce the crimp rate after boiling water treatment to 28% or less. become able to. This heat treatment under low tension may be performed in the state of cheese or bobbin, or may be performed while releasing the wound crimped yarn. The tension applied here, while leaving fine crimps,
It is intended to moderately crimp, and although it depends on the crimp level and cross-sectional structure of the crimped yarn, it is usually 0.01 g / d or more.
A tension of 0.15 g / d is selected. Heat treatment temperature is 8
0-130 ° C is preferred. As the heat treatment conditions, a method such as a treatment in a bath at a corresponding temperature, a treatment in an atmosphere of dry heat or steam, or a method of passing through these atmospheres is adopted.

Further, as another means for keeping the elongation rate after the boiling water treatment within the range specified in the present invention, a twist yarn setting treatment described later may be applied. In the crimped yarn for carpet of the present invention, the point is that the crimping ratio after the boiling water treatment of the crimped yarn for carpet before the tuft is applied is 10 to 2
It may be 8%. The polymer constituting the crimped yarn for carpet of the present invention can be used without any particular limitation as long as it can be processed into a thread and can impart crimp. Specific examples of polymers that can be used include polyethylene, polyolefins such as polypropylene, polyethylene terephthalate,
Polybutylene terephthalate, polyesters such as polypropylene terephthalate, polycapramids, polyamides such as polyhexamethylene adipamide, and further include polyacrylonitrile, etc., from the viewpoint of high crimp and crimp durability described above. Particularly, polyamide is preferably used.

The polyamide may be a polyamide copolymer containing a copolymer component to such an extent that the effects of the present invention are not impaired. Furthermore, addition of a copolymer component, addition of particles such as a matting agent, etc. for improving the spinning property and the quality of the final product may be performed without any problem.
Specific examples of the copolymerization component include ε-caproamide, tetramethylene adipamide, hexamethylene sebacamide, hexamethylene isophthalamide, tetramethylene terephthalamide, and xylylene phthalamide.
As the matting agent, titanium oxide is preferably used.
Further, in order to improve the contamination property, Japanese Patent Application Laid-Open No. Hei.
No. 1, a sulfonated copolymerized polyamide containing an alkali metal salt may be used.

In the present invention, the above-described crimped yarn is particularly effective in reducing the warp in a carpet dyed with the above-described crimped yarn. Applicable. As the pigment, any of an organic substance and an inorganic substance can be used without any problem, but generally, carbon black, red iron oxide, and phthalocyanine pigments are preferably used.

Further, if necessary, conventional additives such as a weathering agent, a heat-resistant agent and an antioxidant may be added to the raw material polyamide as long as the effects of the present invention are not impaired.

The carpet of the present invention is a carpet comprising a pile yarn, a tuft of the tuft, and a backing material stuck to the back of the pile. It is characterized by including a crimped yarn.

In the carpet of the present invention, the crimped yarn is preferably used in a pile in an amount of 80% or more, and more preferably 90% or more. By using the above-described crimped yarn for carpet of the present invention as a cut pile at 80% or more,
The subtle differences in the degree of crimping produced by two or three groups of multifilament yarns with different cross-sectional shapes were mixed as moderate variations, and even though microscopic differences in form and dyeing occurred, The feature of the present invention is that the carpet surface does not become vertical streaks.

The carpet using the crimped yarn for carpet of the present invention is an optional carpet that is particularly strict on the vertical streaks,
Useful in roll and line carpet applications. Particularly, it is useful in a non-twisted cut pile in which the vertical streaks are more conspicuous.

In the present invention, in order to obtain an overall higher quality carpet, other filaments may be used as part of the pile in the above-described crimped yarn for carpet according to the present invention as long as the effect is not impaired. There is no harm in using them in combination. For example, in order to lower the frictional charge voltage of a carpet, it is not a problem to mix fibers having antistatic properties.

Next, a typical method for producing a crimped yarn for carpet according to the present invention, in which the warp is less noticeable, will be described.
First, the crimped yarn for carpet of the present invention is basically manufactured by a known spinning method. That is, it is produced by a usual method comprising melt-spinning a molten polymer and continuously passing the spun yarn through cooling, oiling, stretching and crimping steps.

Here, the crimped yarn for carpet of the present invention needs to be composed of the same polymer.
The main feature of the present invention is that the crimped yarn constituting the pile is 2
Various methods can be adopted to obtain a crimped yarn in which multifilament yarns having a group or three groups in cross section are mixed. Specifically, two or three types of target Y-shaped cross-section holes having different degrees of deformation are provided in one spinneret, and spinning and spinning are performed.
A method of obtaining the desired two or three groups of multifilament yarns by aligning at the time of cooling, and separately discharging two or three groups of multifilament yarns using separate bases having discharge holes having different discharge shapes, and winding. A method of obtaining the desired crimped yarn by pulling it up by taking, and a process in which two or three groups of multifilament yarns having different cross-sectional shapes, which have been separately wound up, are drawn up in a separate process to form one crimped yarn And the like. From the standpoint of simplicity of the process and excellent mixing at the single-yarn level, a method of obtaining a target crimped yarn using a single die having different discharge holes is preferable. Needless to say, here, the mouthpiece ejection holes are designed to adjust the ejection amount so that the fineness of the single yarn is substantially the same. If necessary, it is more preferable to design such that the total fineness of each group is almost the same. Further, in order to make the yarn cross section of the Y-shaped cross-section yarn the desired degree of deformation, the spinning conditions such as the shape and amount of the discharge hole of the die at the time of melt discharge, the cooling condition immediately after discharge, and the take-up speed are taken into account. It should be adjusted accordingly.

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. Extruder-type spinning machines are particularly advantageous when a soaked polymer is used.

The melt-spun yarn is cooled, refueled,
Stretching and heat setting are performed as necessary. At the time of stretching, a steam processing device or the like may be used in combination for the purpose of fixing the stretching point. When the raw material polymer is polyamide, in order to impart high crimp in a later step,
Since a certain degree of orientation and crystallization are required, it is usually preferable to perform stretching by 2 to 4 times.

Next, the obtained drawn yarn is crimped by a crimping device. The crimp may be applied by ordinary heating fluid processing, and various crimping methods such as a jet nozzle type, a jet stuffer type, and a gear system may be adopted. In order to achieve the above, a jet nozzle system is preferable. Among them, a crimping nozzle described in U.S. Pat. No. 3,781,949 is preferably used. Further, for the purpose of fixing the crimp, Japanese Unexamined Patent Application Publication No.
The cooling device described in Japanese Patent No. 21058 or a rotary filter may be combined.

The obtained crimped yarn for carpet of the present invention can be entangled as necessary for the purpose of improving the passability in a subsequent step. The confounding can be applied by a known method, but if too much confounding is applied to the crimped yarn, the characteristics of the crimped yarn are impaired as described above, and the bulky property is impaired. It is necessary.

The obtained crimped yarn for carpet of the present invention is subjected to twisting and heat treatment according to the purpose, and any known method can be employed.

Tufting can be performed by a known method. As described above, the crimped yarn for a carpet of the present invention exhibits an effect particularly when it is tufted as a cut pile, but can be used in various forms such as a cut pile, a loop pile, and a cut and loop pile. The pile height of the carpet of the present invention may be appropriately set depending on the application, but is usually selected in the range of 3 mm to 20 mm, preferably 4 mm to 10 mm.

Subsequently, dyeing and backing are performed by a known method. As the dyeing method, continuous dyeing, Winth dyeing, and rope dyeing can be used without any particular limitation. Of course, when the original yarn is used or when the cheese is dyed before the tuft, the dyeing after the tuft can be omitted, and the backing is directly performed. In this case, it is recommended to perform shearing or hair splitting as necessary as a more preferable technique.

It is also preferable to apply an antifouling agent to the carpet of the present invention in order to enhance the antifouling property. In the carpet using a multifilament filament yarn in which filaments having different degrees of deformation of the present invention are mixed, a texture that is not changed conventionally can be obtained by combining the difference in the degree of deformation with the carpet tuft standard such as pile high. be able to.

[0054]

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 ₂ ] × 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. 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 each diameter of the circumscribed circle and the inscribed circle is defined as the degree of deformation.
The average value of five single fibers is measured.

[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.

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

[Example 1] In a discharge hole similar to the die discharge hole described in Fig. 1 of Japanese Patent Publication No. 2-8044, two types of discharge holes having different widths and lengths were replaced with one die. Was melt-spun using an extruder type spinning machine to obtain a single yarn having a Y-shaped cross section. Here, the two types of discharge holes are formed so that the degree of deformation becomes 4.0 and 2.0 upon cooling after spinning, and the discharge amount per single hole is the same.
The discharge hole depth was designed. Further, the number of holes of each of the two types of discharge holes was set to the same number as 34. Immediately after cooling and solidifying the two groups of spun yarns, they are aligned, then refueled, stretched, and subsequently crimped using a jet nozzle (JN) described in JP-B-58-1214 without winding. After winding, a polyamide multifilament crimped yarn having a total fineness of 1200 dtex and 68 filaments was obtained. Before winding, slight confounding was applied. The resulting crimped yarn is
The single fiber fineness was 17.6 dtex. The crimp elongation of the crimped yarn after the boiling water treatment was 20.0% on average.

Next, in a normal level cut, 1/1
The tuft was adjusted by adjusting the stitch so that the weight was 0 gauge and the basis weight was 750 g / m ² . At this time, the pile height was set to 5 mm. Thereafter, staining 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./m.
in. Table 1 shows the results of evaluation of the "vertical streaks" and "volume feeling" of the carpet thus obtained.
Shown in

Example 2 In the same manner as in Example 1, a nylon 6 chip having a sulfuric acid relative viscosity of 2.8 was used with an extruder type spinning machine using a single die having two types of Y-type discharge holes. By melt spinning, a single yarn having a Y-shaped cross section was obtained.
Here, the two types of discharge holes have a deformation degree of 5.0 after cooling after spinning.
And the discharge hole shape and the discharge hole depth were designed so that the discharge amount per single hole was the same. In addition, the number of holes of each of the two types of discharge holes was the same as 54. The jet yarns (JN) described in JP-B-58-1214 are drawn out of the two groups of spun yarns immediately after cooling and solidifying in the same manner as in Example 1, without oiling, stretching, and subsequently winding. And then wound to give a polyamide multifilament crimped yarn having a total fineness of 1700 dtex and 108 filaments. At this time, the single fiber fineness was 15.7 dtex. The crimp elongation of the crimped yarn after the boiling water treatment was 18.5%.

The thus obtained crimped yarn is wound around a plastic cylindrical tube and has a tension of about 0.035 g / d.
Take up with acid dye
Dyeing was carried out in a water bath at 0 ° C. for 20 minutes. Then, with a normal level cut, 1/10 gauge, the basis weight is 800 g /
The backing was performed by adjusting the stitch so as to obtain m ² and tufting. Table 1 shows the results of evaluating the "vertical streaks" and "volume feeling" of the cheese-dyed carpet thus obtained.

Example 3 In Example 1, the number of filaments having a degree of deformation of 4.0 was 34, and the degree of deformation was 2.0.
Was set to 54. However, in order to make the single yarn fineness almost the same, the shape of the discharge hole was designed so that the discharge amount would be the same. The two groups of spun yarns were drawn out immediately after cooling and solidifying in the same manner as in Example 1, then refueled, stretched and continuously wound up without winding.
JP-A No. 6-205, a jet nozzle (JN) is used to impart crimping and then take up, a total fineness of 1200 dtex, 5
A 4-filament polyamide multifilament crimped yarn was obtained. At this time, the single fiber fineness was 1 for a single yarn having a deformation degree of 4.0.
The single yarn having a 7.6 dtex and a deformation degree of 2.0 was 19.1 dtex, and the difference was about 8.5%. The crimp elongation of this crimped yarn after the boiling water treatment was 22.5%.

Next, as in Example 1, tufting was performed by adjusting the stitches so that the gauge and the basis weight were 750 g / m ² by ordinary level cutting. Thereafter, dyeing and backing were performed in the same manner as in Example 1. Table 1 shows the results of evaluating the "vertical streaks" and "volume feeling" of the carpet thus obtained in the same manner as in Example 1.

Example 4 As a die used in Example 1, one die having three types of Y-type discharge holes having different widths and lengths was used. As in Example 1, chips of nylon 6 having a sulfuric acid relative viscosity of 2.8 were melt-spun by an extruder-type spinning machine, and the degree of deformation was 5.0, 3.4, and 2.0 by cooling after spinning. So that
The shape and the depth of the discharge hole were designed so that the discharge amount per single hole was the same. In addition, the number of holes of each of the two types of discharge holes was the same as 30. Immediately after cooling and solidifying, the three groups of spun yarns were aligned, refueled and stretched in the same manner as in Example 1, continuously crimped using a jet nozzle (JN), and then wound. A polyamide multifilament crimped yarn having a total fineness of 1350 dtex and 90 filaments was obtained. At this time, the single fiber fineness was calculated to be 15.0 dtex. The crimp elongation of the crimped yarn after the boiling water treatment was 21.0%.

Next, two crimped yarns obtained in the same manner as in Example 1 were alternately arranged, and gauges and
The stitch was adjusted so that the basis weight was 750 g / m ^2, and tufting was performed. Thereafter, dyeing and backing were performed in the same manner as in Example 1. Table 1 shows the results of evaluating the "vertical streaks" and "volume feeling" of the carpet thus obtained.

As is evident from the results in Table 1, in each of the examples of the present invention, the carpet's vertical streaks and voluminous feel were at satisfactory levels.

[Comparative Examples 1 to 3] In Example 1, the case where the degree of deformation of the second group was designed to be 3.0 and 2.8 and the ratio of both was 1.07 was compared to the case of the first and second groups. The yarn fineness of 17.6 decitex and 11.1 decitex differed by 50% or more as Comparative Example 2 and the one with the number of confounds increased to 25 as Comparative Example 3, respectively. Table 1 also shows the results of evaluation of "vertical streaks" and "volume feeling" of the carpet obtained by performing the backing.

In Comparative Example 1, since the difference in the degree of deformation was small, the effect of reducing vertical streaks was small, and vertical streaks occurred on the carpet surface. Further, in Comparative Example 2, since the single yarn fineness between the groups was greatly different, the effect of the variation was small, and the vertical streaks were also generated. Further, in Comparative Example 3, since the number of confounds was high, the carpet was seen through the ground when formed into a carpet, and the volume was poor.

[0073]

[Table 1]

[0074]

The crimped yarn for carpets of the present invention can suppress the formation of warp lines which are often seen in carpets, particularly light-color cut pile carpets, without impairing the feeling. Further, the carpet of the present invention utilizes the characteristics of the above-described crimped yarn for carpet as it is, and is particularly suitable as an optional carpet, a roll carpet, and a line carpet.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification FI theme coat テ ー マ (Reference) D02J 1/22 D02J 1/22 PQ F term (Reference) 3B120 AA35 BA30 DB03 EB16 EB30 4L036 MA06 MA20 MA33 PA01 PA03 PA33 PA41 RA04 UA07 UA21 4L045 AA05 BA03 BA14 BA36 BA43 BA60 DA09 DA25 DA42

Claims (8)

[Claims] 1. A crimped yarn in which two groups of multifilament yarns having a Y-shaped cross section and different in the degree of deformation differing by 1.5 times or more from the same polymer are mixed, or the same polymer is deformed by 1.2 times each other. A crimped yarn in which three different groups of multifilament yarns having a Y-shaped cross section are mixed, wherein the fineness of the single yarn constituting each of the multifilament yarns is substantially the same, and the number of entanglements is 20 / m or less. 2. The crimped yarn for carpet according to claim 1, wherein the fineness of the multifilament yarn of each group is substantially the same. 3. The crimped yarn for carpet according to claim 1, wherein the total fineness of the crimped yarn is 600 to 2500 decitex. 4. The crimp elongation of the crimped yarn after the boiling water treatment is 5 to 5.
The crimped yarn for carpet according to any one of claims 1 to 3, wherein the amount is 28%. 5. The crimped yarn for carpet according to claim 1, wherein the polymer constituting the crimped yarn is polyamide. 6. A carpet, wherein the crimped yarn for carpet according to any one of claims 1 to 5 is used in at least 80% of a pile constituting the carpet. 7. The carpet according to claim 6, wherein the carpet is one of an optional carpet, a roll carpet and a line carpet. 8. The carpet according to claim 6, wherein the pile is non-twisted and cut pile.