JP2002069767A - 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 is the one comprising two groups with Y- shaped cross sections, obtained by mixing each group of single filament size having >=1.5 times difference in size to each other, or three groups with Y- shaped cross sections, obtained by mixing each group of single filament size having >=1.25 times difference in size from each other, and having the substantially same modified degree in the whole groups of the single filament sizes and <=20/m number of interlaces, and 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 difference in the fineness of single yarn constituting each of the multifilaments to be mixed is small, the texture of the obtained carpet is changed, but the effect of reducing the warp is small.

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. 1-2577 discloses no idea that crimped yarns made of the same polymer are mixed with crimped yarns having a certain single yarn fineness 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. Therefore, an object of the present invention is to provide a crimped yarn capable of suppressing the occurrence of warp streaks often seen in carpets, particularly carpets of a light-colored cut pile, without impairing the texture, and a warp streaks using this crimped yarn. There is no carpet to offer.

[0019]

In order to solve the above-mentioned problems, the crimped yarn for carpet of the present invention comprises two groups of Y-shaped cross sections made of the same polymer and having a single yarn fineness different by at least 1.5 times. Crimped yarn in which multifilaments are mixed or crimped yarn in which multifilaments having three groups of Y-shaped cross sections different from each other by 1.25 times or more are mixed, and each single yarn fineness group is deformed The degree is substantially the same, and the number of confounds is 20 pieces / m or less.

In the crimped yarn for carpet according to the present invention, the following (1) to (4) are each preferred 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.

[0022]

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,
A crimped yarn in which multifilaments having two groups of Y-shaped cross sections having single yarn finenesses differing by 1.5 times or more are mixed, or multifilaments having three groups of Y-shaped cross sections having single yarn finenesses differing by 1.25 times or more from each other It is a crimped yarn in which yarns are mixed, and is characterized in that the degree of deformation of each constituent single yarn fineness group is substantially the same. That is, by mixing two or three types of multifilaments having a specific cross-sectional shape and fineness configuration, the carpet pile becomes moderately uneven when it is constructed, and it is possible to obtain a carpet that does not easily become vertical streaks. .

Here, in the case of two groups of multifilament yarns, the difference in single yarn fineness needs to be 1.5 times or more, preferably 1.8 times or more. When the difference in single yarn fineness is less than the above range, the difference between the groups is small, and the effect of reducing the warp due to appropriate variation cannot be exhibited.
In the case of three groups of multifilament yarns, the difference in single yarn fineness is 1.25 times or more, preferably 1.5 times or more.
It needs to be more than double. When the difference in single yarn fineness is less than the above range, the difference between the groups is small similarly to 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 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 the cross section has a protrusion in the direction. For example, the cross section has a protrusion in three directions as shown in FIG. 1 of Japanese Patent Publication No. 2-8044. 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 single yarn fineness of the Y-shaped cross-section yarn needs to have a certain difference depending on the group as described above, and the single yarn fineness is preferably in the range of 6 to 60 decitex. If it is less than 6 decitex, it is too soft, has no waist, and the hair falls remarkably, and the carpet becomes weak in terms of durability and abrasion. On the other hand, if it is larger than 60 dtex, the durability is improved, but the texture of the carpet is coarse and the quality is inferior.

In the crimped yarn for carpet in the present invention, it is preferable that the total fineness of the single fineness group of the mixed multifilament yarns is substantially the same. Substantially the same
The difference between the total fineness (product of the average single-filament fineness and the number of filaments constituting the group) of each single-fiber fineness group is within 15%, more preferably within 10%. Difference in total fineness between groups is 15
%, The characteristic of the crimped yarn having a high total fineness becomes dominant on the surface of the carpet, and the effect of reducing the streak as a pile when the carpet is formed is low, and the effect of reducing the vertical streaks is not exhibited. In addition, the degree of mixing between the individual yarns varies,
The surface quality of the carpet also deteriorates.

The mixed yarn described in Japanese Patent No. 2853873 described above has an area occupied by each single yarn fineness group by simultaneously changing the single yarn fineness and the deformation degree in order to obtain a deep color with a soft touch. The present invention is significantly different from these known examples in this point.

Further, the crimped yarn for carpet in the present invention is required to have the number of entanglements of 20 / m or less.
If the number of confounds exceeds 20 pieces / m, the convergence is so strong that the volume of the carpet is impaired. In particular, in the case of a cut pile, there is a problem that the confounding often remains, resulting in a carpet having a hard texture and being transparent.

In the crimped yarn for carpet in the present invention, it is necessary that two or three groups of multifilament yarns having different single yarn deniers are composed of the same polymer. The term "identical polymer" as used herein means that the polymers used in the spinning stage are identical. When the polymer type is changed for each group having a different single-filament fineness, the manufacturing process becomes complicated and the gloss and the dyeing property itself are different. The effect of reducing streaks diminishes.

In the crimped yarn for carpet in the present invention, it is necessary that the degree of deformation of the multifilament yarn in each group is substantially the same. Here, the degree of deformation means a numerical value (diameter of circumscribed circle / diameter of 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.
The fact that the degree of deformation of the Y-shaped section yarn is substantially the same means that the ratio of the degree of deformation of each group is a difference of 10% or less. If the degree of deformation of each group does not exceed 10%, the single yarn fineness differs 2
Alternatively, the characteristics of the three groups are averaged and appear on the surface of the carpet, and the warp reduction effect is more effectively exhibited.

The crimped yarn for carpet in the present invention preferably has a total fineness of 600 to 2500 dtex, more preferably 1000 to 2000 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 there is no need to adjust gauges and stitches, so that there is no breakage of single fibers or pile removal during tufting A stable carpet can be obtained.

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 has been applied, even if the elongation after boiling water treatment exceeds 28%, as described in JP-B-60-47949, for example, 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 after the boiling water treatment within the specified range of the present invention, a twist yarn setting treatment described later may be performed. 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 effect of reducing the vertical streaks is exhibited particularly in a carpet dyed with the above-described crimped yarns. 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 composed of a face yarn as a pile, a base fabric obtained by tufting the surface yarn, and a backing material adhered to the back of the base fabric, wherein the pile has the structure described above. It is characterized by including a crimped yarn.

In the carpet of the present invention, it is preferable to use the above-mentioned crimped yarn in a pile in an amount of 80% or more, 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,
Differences in the dyeing properties and the degree of crimping produced by two or three groups of multifilament yarns with different single yarn fineness are mixed as moderate variations, and even if microscopically, morphological differences and dyeing differences occur. Also, there is a feature of the present invention 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 a higher quality carpet as a whole, the above-mentioned crimped yarn for carpet of the present invention may include another filament as a part of the pile as long as its 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 the crimped yarn for carpet of 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, it is necessary that the crimped yarn for carpet of the present invention is 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 different single-filament finenesses of the group or the three groups are mixed. Specifically, two or three types of target single-holes having different Y-shaped cross-section discharge amounts are provided in one spinneret, and the target two or three groups of multi-units are aligned during spinning and cooling. A method of obtaining a filament yarn, a method of separately discharging two or three groups of multifilament yarns using separate spinnerets having different numbers of holes, and a method of obtaining the desired crimped yarn by aligning them by winding. And a method in which two or three groups of multifilament yarns having different single-filament finenesses are drawn together in a separate process to form one crimped yarn. In terms of simplicity of the process and excellent mixing at the single-yarn level, among others, one having a different single-hole discharge amount
A preferred method is to use a piece of die to obtain the desired crimped yarn. Needless to say, here, the mouthpiece discharge holes are designed to adjust the discharge amount so that the total fineness of each single yarn fineness group becomes substantially 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.

After the melt-spun yarn is cooled and 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, if 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 methods 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 of different single yarn fineness of the present invention are mixed,
By combining the difference in single-fiber fineness with the carpet tuft standard such as pile high, it is possible to obtain a material with a different texture than before.

[0052]

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 yarn fineness] The total fineness measured according to JIS L 1090 was obtained by dividing by the number of single yarns.

[Crimp elongation rate after boiling water treatment] Room temperature (25
-35 ° C.), a crimped flat yarn unwound from a package that has been left for at least 20 hours in an atmosphere having a relative humidity of 50 to 75% is immersed in boiling water for 30 minutes without load,
After drying to an equilibrium moisture content, this is used as a crimped yarn sample after boiling water treatment. An initial load of 2 mg / d is applied to this sample yarn for 30 minutes.
After a lapse of seconds, a mark is made 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 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.

[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 there is no vertical streak. Δ: There is no clear vertical streak, but there are spots in each pile. ×: Looks muscle-like. 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] A nylon 6 chip having a relative viscosity of sulfuric acid of 2.8 was extruded by using a die having two groups (thick fineness and fine fineness) of discharge holes having different single yarn fineness in one die. Melt spinning with a ruder type spinning machine.
A cross section yarn was obtained. Here, the two discharge hole groups have a discharge hole shape and a discharge hole depth such that the discharge amount per single hole after spinning is 1.7 times larger in the fine fineness group (A) than in the fine fineness group (C). Designed. The number of discharge holes in each of the two groups was 20 for the fine fineness group (A).
The number of fine fineness groups (C) was 34, and the product was designed so that the product of single hole discharge amount × number of holes was the same. The two groups of spun yarns are drawn together immediately after cooling and solidification, then refueled, stretched, and subsequently crimped without winding using a jet nozzle (JN) described in JP-B-58-1214. After the application, winding was performed to obtain a crimped polyamide multifilament yarn having a total fineness of 1170 dtex and 54 filaments.
Before winding, slight confounding was applied. The single yarn fineness of the obtained crimped yarn was 29.3 decitex for the single yarn obtained from the large fineness group, and 17.2 decitex for the single yarn obtained from the fine fineness group. The crimp elongation of the crimped yarn after the boiling water treatment was 20.0% on average.

Then, 400 obtained crimped yarns were aligned, and the tufts were adjusted by adjusting the stitches so as to obtain 1/10 gauge, pile height of 6 mm, and basis weight of 600 g / m ² by ordinary level cut. . Then, dye according to the usual method,
Backing was implemented. 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 shows the results of evaluating the "vertical streaks" and "volume feeling" of the carpet thus obtained.

Example 2 Using a single die having two groups of Y-shaped discharge holes, a nylon 6 chip having a relative viscosity of sulfuric acid of 2.8 was produced by an extruder type spinning machine in the same manner as in Example 1. By melt spinning, a single yarn was obtained as a Y-shaped cross-section yarn.
Here, the discharge hole shape and the discharge hole depth of the two kinds of discharge holes were designed such that the discharge amount per single hole during spinning was twice as large in the fine fineness group (A) as in the fine fineness group (C). . The number of discharge holes in each of the two groups is 32 in the fine fineness group (A) and 32 in the fine fineness group (C).
The number was set to four, and the product was designed so that the product of the single hole discharge amount × the number of holes was the same. The two groups of spun yarns are drawn together immediately after cooling and solidifying, then refueled, stretched, and subsequently crimped without winding using a jet nozzle (JN) described in JP-B-58-1214. Winding after applying, total fineness 1
A polyamide multifilament crimped yarn of 560 dtex and 96 filaments was obtained. The single yarn fineness of the crimped yarn obtained at this time is 2 single yarns obtained from the thick fineness group (A).
The single yarn obtained from 4.4 dtex and the fineness group (C) had 12.2 dtex. The crimp elongation of the crimped yarn after the boiling water treatment was 18.5%.

The crimped yarn is wound on a plastic cylindrical tube at a tension of about 0.035 g / d, and dyed in an as-wound form with an acidic dye at 90 ° C. for 20 minutes in a water bath. did. Next, 400 pieces of the crimped yarns are aligned and cut by a normal level cut to obtain a 1/10 gauge, pile high 6 mm,
The stitch was adjusted so that the basis weight was 600 g / m 2, tufting was performed, and backing was performed. Table 1 shows the results of evaluating the "vertical streaks" and "volume feeling" of the cheese-dyed carpet thus obtained.

Example 3 A nylon 6 having a relative viscosity of 2.8 sulfuric acid was prepared by using a die having three groups (thick fine, medium fine, and fine fine) of discharge holes having different single-filament fineness in one die. The chips were melt-spun by an extruder-type spinning machine to obtain a single yarn having a Y-shaped cross section. Here, the three discharge hole groups have the largest fineness group (A) in the discharge amount per single hole after spinning.
The ejection hole shape and the ejection hole depth were designed so as to be 1.5 times the medium fineness group (B) and 1.5 times the fineness group (B). The number of holes in each of the three discharge hole groups was 24 for the fine size group (A), 36 for the medium size group (B), and 54 for the fine size group (C). The products were designed to have the same number. The three groups of spun yarns are immediately aligned after cooling and solidifying, are refueled and stretched in the same manner as in Example 1, are continuously crimped using a jet nozzle (JN), and are wound up. , Total fineness 1560 dtex, 1
A 14 filament polyamide multifilament crimped yarn was obtained. At this time, the single yarn fineness obtained from the large fineness group (A) was 21.7 decitex, the single yarn obtained from the medium fineness group (B) was 14.4 decitex, and the single yarn fineness was obtained from the fine fineness group (C). The obtained single yarn was 9.6 dtex. The crimp elongation of this crimped yarn after boiling water treatment was 14.0.
%Met. Next, the obtained crimped yarns were aligned and stitched so as to obtain 1/8 gauge, a pile height of 5 mm, and a basis weight of 450 g / m ² by ordinary level cutting, and tufted. Thereafter, dyeing is performed in the same manner as in Example 1,
Backing was implemented. Table 1 shows the results of evaluating the "vertical streaks" and "volume feeling" of the carpet thus obtained.

As is clear from the results shown in Table 1, in the examples of the present invention, the carpet was satisfactory in both the vertical streaks and the volume.

[Comparative Examples 1 and 2] In Example 1, the single group fineness of the second group was 24.4 dtex and 19.5 dtex, and the ratio of both was 1.25. The case where the number was increased to 25 was set as Comparative Example 2, and the carpets obtained by performing tufting, dyeing and backing in the same manner as in the examples were evaluated for "vertical streaks" and "volume feeling". It is described together.

In Comparative Example 1, since the difference in single yarn fineness was small, the effect of reducing vertical streaks was small, and vertical streaks occurred on the carpet surface. Further, in Comparative Example 2, when the carpet was used as a carpet due to a high number of confounds, the see-through occurred, and the volume feeling was poor.

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[Table 1]

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EFFECT OF THE INVENTION The crimped yarn for carpet of the present invention is a crimped yarn capable of suppressing the occurrence of warp lines which are often seen in carpets, particularly light-color cut pile carpets, without impairing the feeling, and the crimped yarn. Can provide a carpet without vertical streaks. 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.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) D02J 1/22 D02J 1/22 P Q // D01D 5/08 D01D 5/08 GF term (Reference) 3B120 AA08 AA14 AA41 BA02 BA28 DB03 EB15 EB16 EB19 4L036 MA06 MA20 MA33 PA01 PA03 PA33 PA41 RA04 UA07 UA21 4L045 AA05 BA03 BA14 BA36 BA43 BA44 BA60 DA09 DA42

Claims (8)

[Claims] (1) The same polymer has a single yarn fineness of 1.5.
A crimped yarn in which two groups of multifilament yarns having a Y-shaped cross section different by at least two times or a single yarn fineness of 1.2
A crimped yarn in which three groups of multifilament yarns having Y-shaped cross sections different by 5 times or more are mixed, wherein the single yarns constituting each of the multifilament yarns have substantially the same degree of deformation, and the number of entanglements is A crimped yarn for a carpet, wherein the number is 20 yarns / 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 claim 1 is used in 80% or more of piles 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.