JP2002161448A - Crimped yarn for carpet and carpet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain both a crimped yarn capable of creating a carpet having sufficient impact resilience, sufficient bulkiness and durability while having a soft touch feeling and the carpet using the crimped yarn. SOLUTION: This crimped yarn for the carpet is characterized in that a flat cross-section multifilament yarn having a flatness Rf and a Y-shaped cross- section multifilament yarn having a degree Rm of modified cross section and satisfying the formulas 2.0<=Rf<=7.0 and 2.0<=Rm<=6.0 are mixed therein, the number of tangles is <=20 tangles/m ad a polymer constituting the crimped yarn is a polyamide. The carpet uses the crimped yarn for the carpet as piles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a crimped yarn for carpet and a carpet using the crimped yarn. More specifically, a new carpet having sufficient rebound resilience, bulkiness, and durability while having a soft touch feeling because a multi-filament having a flat cross section and a multi-filament having a Y-shaped cross section are mixed and made of polyamide. The present invention relates to a crimped yarn for a carpet, and a carpet using the crimped yarn.

[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 excellent cushioning properties and high-grade feeling, as well as excellent interior space effects, and particularly a uniform and calm atmosphere. Has been requested.

[0004] 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.

[0005] On the other hand, the 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.

[0006] Although carpets are basically stepped on with feet, in recent years, improvement in texture, specifically, soft touch and good texture has been demanded. In a home carpet, since it is placed in a living room or the like, it is assumed that the carpet may be laid down on the carpet or unconsciously traced on the surface of the mat while sitting, and a soft texture is particularly strongly required.

Here, if only a soft feeling is pursued, a crimped yarn made of a single yarn having a small second moment of area 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 carpet, a soft texture is certainly obtained, and by limiting the single-fiber fineness, flatness, and crimp elongation within a specific range, a carpet that is somewhat stiff and has excellent durability is obtained. Obtained. However, it was not yet satisfactory because it was composed only of the flat cross-section filaments.

[0009] Japanese Patent Publication No. 8-13287 and Japanese Patent No. 2813287
No. 53873 proposes a crimped yarn and a carpet for a carpet having a soft surface touch and firm firmness by combining multifilaments having different degrees of deformation and fineness. In this proposal, although the softness of the texture was certainly recognized, the softness was small because the cross-sectional shapes of the filament groups constituting the crimped yarn were all Y-shaped cross-sections, and further improvement was required.

Japanese Patent Application Laid-Open No. 9-157985 discloses a polyester fiber for carpet obtained by mixing filaments having a cross section such as triangular, irregular hollow, Y-shaped cross section or square hollow with filaments having a flat cross section or round cross section. A method for producing a yarn has been proposed. From the fiber yarn obtained by this method, a carpet with a softer texture than before was obtained,
Because it is a crimped yarn made of polyester, its softness was just one step away. In addition, the carpet had satisfactory bulkiness and rebound resilience to some extent, but was still a carpet with dissatisfaction in terms of rebound resilience and durability because it was a fiber yarn made of polyester.

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, the proposal aims at bringing the texture closer to silk in apparel applications, and there is no idea of improving the texture by applying it to crimped yarn of a carpet.

Japanese Patent Publication No. 23577/1990 proposes an example of a carpet in which crimped yarns using polymers having different shrinkage characteristics are mixed to show the spun-like bulkiness and texture. 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, in the crimped yarn used for tile carpets, two or more types of crimped yarns having different dyeing properties are mixed and entangled to produce a carpet pattern. Here, a crimped yarn having a different single yarn cross section for each of the crimped yarns having different dyeing properties to be mixed is also proposed. However, in this example, the purpose is to create a pattern, and the texture is not improved. In addition, high confounding was applied in order to express the handle, and although there was no problem as a loop, a converging portion remained in the cut pile, and the carpet had a poor volume feeling.

[0014]

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

The present invention has been achieved as a result of studying the problem of the above-described conventional technique as a problem. Accordingly, an object of the present invention is to provide a carpet crimped yarn capable of producing a new carpet having sufficient rebound resilience, bulkiness and durability while having a soft touch feeling, and a carpet using the crimped yarn. Is to do.

[0016]

Means for Solving the Problems In order to solve the above problems, a crimped yarn for carpet of the present invention mainly has the following constitution. That is, it is a crimped yarn in which a flat cross-section multifilament satisfying the following equation and a Y-shaped cross-section multifilament having a deformation degree Rm are mixed, and the number of entanglements is 2
A crimped yarn for carpet, characterized in that the polymer constituting the crimped yarn is 0 polyamide / m or less and is polyamide. (1) 2.0 ≦ Rf ≦ 7.0 (2) 2.0 ≦ Rm ≦ 6.0 In the present invention, the single fiber fineness Am of the flat cross-section multifilament, the number of single yarn An, and the single fiber of the Y-shaped cross section multifilament It is preferable that the fineness Bm and the number of single yarns Bn satisfy the following relationship. (3) 1 / 1.15 ≦ (Bm × Bn) / (Am × A
n) ≦ 1.15 (4) 1.5 ≦ Bm / Am In the present invention, the total fineness of the crimped yarn is 600 to 20.
It is also preferable that the content is not more than 00 dtex and the crimp elongation after the boiling water treatment is 5 to 28%, respectively.

The carpet of the present invention mainly has the following construction. That is, a carpet characterized in that the crimped yarn for a carpet is used in 80% or more of the pile constituting the carpet. In the carpet of the present invention, the carpet is preferably any of an optional carpet, a roll carpet, a line carpet, and a household carpet. It is also preferred that the pile be non-twisted and cut pile.

[0018]

Next, the present invention will be described in more detail. In the present invention, the flat cross-section multifilament is a multifilament composed of a single fiber having a cross section substantially in a rectangular shape in a cross section perpendicular to the longitudinal direction of the single fiber as shown in FIG. For example, it is described in JP-A-2000-22050. Here, when the length of the long side of the rectangle is a and the length of the short side is b, the flatness Rf is defined as Rf = a / b. The side of the flat cross section may have irregularities as shown in FIG. 2 or may have a hollow portion. In this case, the smallest rectangle covering the cross section of the single yarn including the irregularities is assumed, and the lengths of the long side and the short side are a and b, respectively.

In the present invention, the Y-shaped cross-section multifilament has a convex portion in three directions in a cross section perpendicular to the longitudinal direction of the single fiber as shown in FIG. It is a multifilament consisting of a single fiber connected by smooth concave portions. For example, it is described in FIG. 1 of Japanese Patent Publication No. 2-8044. The three protruding parts give the pile a bulky and bulky feel and create excellent cushioning. The fiber may have one or more hollow portions. When compared with the same fineness having a hollow portion, a carpet having high bulkiness can be obtained because the apparent occupied volume is higher. This is described in a yarn called a Y-type hollow fiber, for example, in US Pat. No. 2,945,739. Here, when the radius of the circumscribed circle of the Y section is c and the radius of the inscribed circle is d, the degree of deformation Rm is defined as Rm = c / d.

The reason why the crimped yarn for carpet of the present invention can produce a new carpet having sufficient rebound resilience, bulkiness and durability while having a soft touch feeling will be described.

In the crimped yarn of the present invention, a filament having a flat cross section and a filament having a Y-shaped cross section are mixed. Flat cross-section filaments are particularly difficult to crimp among filaments of various cross-sections. Therefore, the crimped yarn of the present invention has a flat cross-section filament having a low crimp level and a Y filament having a high crimp level.
It will be composed of a mold cross section filament. When this crimped yarn is used for a carpet, the following results are obtained. For example, in a cut pile carpet, on the cut pile surface, a single fiber having a flat cross section with a low crimp level relatively appears on the surface of the cut surface, and a single fiber with a high crimp level has a relatively low cut surface. Sinks from. Thus, a carpet having a soft touch feeling is obtained by the effect of the single fiber having a flat section having a small second moment of area which appears on the surface. On the other hand, a carpet having sufficient rebound resilience and bulkiness is obtained by the effect of a single fiber having a Y-shaped cross section that is sunk and has a large second moment of area and a high crimp level.

In the crimped yarn for carpet of the present invention,
It is essential that multi-filaments with a flat section Rf satisfying the following relationship be mixed. (1) 2.0 ≦ Rf ≦ 7.0 Here, if the flatness is less than 2.0, the carpet will have a weak soft touch feeling. When the flatness exceeds 7.0, a carpet having low abrasion resistance is obtained, and at the same time, it becomes difficult to form a flat yarn.

In the crimped yarn for carpet of the present invention,
It is essential that Y-shaped multifilaments having a deformation degree Rm satisfying the following relationship are mixed. (2) 2.0 ≦ Rm ≦ 6.0 Here, if the degree of deformation is less than 2.0, a carpet having low bulkiness will result. When the degree of deformation exceeds 6.0, the carpet becomes less durable, and at the same time, it becomes difficult to form a Y-type yarn.

It is essential that the crimped yarn for carpet in the present invention has an entanglement number of 20 / m or less. If the number of entanglements exceeds 20 pieces / m, the convergence is strong and the voluminous feel, that is, the bulkiness of a carpet is impaired. Especially in the case of a cut pile, confounding often remains, resulting in a carpet that is hard and transparent.

In the crimped yarn for carpet in the present invention, it is essential that the polymer constituting the crimped yarn is polyamide. When the crimped yarn is made of polyamide, a part of the crimped yarn is a flat cross-section multifilament having low rebound resilience, but makes up a carpet having sufficient rebound resilience. In addition, the carpet has sufficient durability.

The polyamide used in the present invention includes polycapramide, polyhexamethylene adipamide and the like. Polycapramide is more advantageous from the viewpoints of versatility and coloring. Polyhexamethylene adipamide is more advantageous in terms of rebound resilience and durability.

A polyamide copolymer containing a copolymer component to the extent that the effects of the present invention are not impaired may be used.
Furthermore, in order to improve the spinning properties and the quality of the final product,
Aggressive addition of a copolymer component or addition of particles such as a matting agent does not matter at all. Specific copolymerization components include ε-caproamide, tetramethylene adipamide, hexamethylene sebacamide, hexamethylene isophthalamide, tetramethylene terephthalamide, xylylene phthalamide, and the like. As the matting agent, titanium oxide is preferably used. Further, in order to improve the stainability, a sulfonated copolymer polyamide containing an alkali metal salt as described in JP-A-3-137221 may be used.

Polyamides colored with pigments can also be used. As the pigment, any of an organic substance and an inorganic substance may be used, but generally, carbon black, red iron oxide, and phthalocyanine pigments are preferably used.
Further, if necessary, 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.

In the crimped yarn for carpet of the present invention, the single fiber fineness Am of the multifilament having a flat cross section and the number of single yarns A
It is preferable that n, the single fiber fineness Bm of the Y-shaped cross-section multifilament, and the single yarn number Bn satisfy the following relationship. (3) 1 / 1.15 ≦ (Bm × Bn) / (Am × A
n) ≦ 1.15 (4) When 1.5 ≦ Bm / Am (Bm × Bn) / (Am × An) is in such a range, that is, the fineness of each of the cross-sectional types of the flat cross section and the Y-shaped cross section is almost the same. When the ratio is 1: 1, a carpet with a more balanced feeling can be obtained without being biased to one of the characteristics of the soft touch feeling of the single yarn having the flat cross section and the resilience and bulkiness of the single yarn having the Y-shaped cross section. Bm / A
When m satisfies such a relationship, a carpet having both a soft touch feeling, rebound resilience and bulkiness at a high level can be obtained.

In the crimped yarn for carpet of the present invention, the total fineness is preferably from 600 to 2,000 dtex, more preferably from 1,000 to 1,800 dtex.

When the total fineness is lower than 600 dtex, it is necessary to carry out an unnecessarily multiplying step in order to maintain the basis weight of the carpet, and it is necessary to increase the gauge and stitches. And pile missing are frequent and are likely to lack process stability. Also 2000
When dtex is exceeded, the roll carpet or the line carpet needs to reduce the gauge and stitch on the contrary, and it is too thick to make the tuft difficult, and it is necessary to devise the tuft condition.

In the crimped yarn for carpet of the present invention, the single fiber fineness is not particularly limited, but is preferably 5 to 40 dt.
ex. Here, it is preferable that the single yarn fineness of the flat cross section single yarn and the Y-shaped cross section single yarn satisfy the relationship described above.

If the single fiber fineness is smaller than 5 dtex, not only the durability is reduced in terms of abrasion, but also a stable yarn is likely to be difficult, for example, a single yarn collision occurs in the yarn making process. On the other hand, if the single fiber fineness exceeds 40 dtex, the surface of the carpet becomes too hard, and cooling during spinning is difficult, and stable spinning tends to be difficult.

In the crimped yarn for carpet of the present invention,
The crimp elongation after boiling water treatment is preferably from 5 to 28%, more preferably from 10 to 24%.

If the crimp elongation rate after the boiling water treatment is less than 5%, the appearance of crimp is insufficient and the carpet tends to be poor in volume feeling. On the other hand, the crimp elongation after boiling water treatment was 2
If it exceeds 8%, since the appearance of crimp is large when the carpet is finished after dyeing and backing, the tip of the single fiber is remarkably bent, the texture becomes hard, and the carpet tends to become a felt-like carpet.

Even if the crimped yarn with crimping has a crimp elongation after boiling water treatment of more than 28%, for example, as described in JP-B-60-47949, Heat treatment under low tension while unwinding the original yarn in a separate step, or heat treatment in the state of cheese to reduce the crimp elongation after boiling water treatment to 28% or less is preferable for the present invention. A crimped yarn can be obtained. This heat treatment under low tension may be performed in the state of cheese or bobbin, or may be set while releasing the wound crimped yarn. The tension applied here is for keeping the crimp moderate while leaving fine fine crimp, and it depends on the crimp level and the cross-sectional structure of the crimped yarn.
0.135 g / dtex (0.01 to 0.15 g / dtex
The tension of d) is selected. The heat treatment temperature is 80-130
C is preferred. As the heat treatment, 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 such an atmosphere is employed.

Further, as another means for adjusting the crimp elongation after the boiling water treatment to a preferable range of the present invention, a twist setting treatment may be performed.

The carpet of the present invention is a carpet using the above-mentioned crimped yarn in 80% or more, preferably 90% or more of the constituting pile.

By using the above-described crimped yarn for carpet in an amount of 80% or more, a carpet having sufficient rebound resilience, bulkiness and durability can be obtained while having a soft touch feeling. A typical carpet form is a carpet composed of a face yarn which is a pile, a base fabric obtained by tufting the surface yarn, and a backing material adhered to the back of the base fabric.

The carpet of the present invention is particularly effective for use in optional carpets, roll carpets, line carpets, and household carpets, which require a high-class feel. In particular, a particularly high effect can be obtained with a non-twisted cut pile whose texture is easily exposed.

As described above, a twisted yarn set may be applied to the crimped yarn of the present invention. In this case, since the space containing the air in the pile becomes smaller, there is a preferable effect that the rebound resilience is improved. On the other hand, on the other hand, the bulkiness is reduced due to the smaller space, but it can be compensated for by taking measures such as increasing the basis weight of the carpet in consideration of the required bulkiness in some cases.

As the form of the twisted yarn, only single twisting may be applied, or two or three twisted yarns may be combined and subjected to various twists of lower twisting and upper twisting.

In order to obtain an overall higher quality carpet in the present invention, the above-described crimped yarn for carpet of the present invention is combined with other filaments as a part of a pile within a range not to impair the effect. You can use it at all. For example, in order to lower the frictional charged voltage of the carpet, it is possible to mix fibers having antistatic properties.

Next, a typical method for producing the crimped yarn for carpet of the present invention will be described. First, the crimped yarn for carpet of the present invention is basically manufactured by a known spinning method. In particular, the molten polymer is obtained by melt spinning, and is subsequently produced by a usual method comprising the steps of cooling, oiling, stretching and crimping. Here, the crimped yarn for carpet of the present invention needs to be composed of polyamide.

In order to obtain a crimped yarn in which a flat section filament and a Y-shaped section filament are mixed, which is the greatest feature of the present invention, various methods can be adopted. A method in which holes for a target flat cross section and a Y-shaped cross section are provided in one spinneret to obtain two kinds of target multifilaments by spinning and cooling, and the flat cross section and the Y-shaped cross section are separately separated. A method of ejecting two types of multifilaments separately and aligning them by winding to obtain a desired crimped yarn; There is a method in which they are aligned in another step to form one crimped yarn. In terms of simplicity of the process and excellent mixing at the single yarn level,
It is preferable to use a die having two types of discharge holes for a flat cross section and a Y-shaped cross section in one die to obtain a target crimped yarn. Needless to say, here, the base discharge hole is designed so that the flatness and the degree of deformation fall within the above-mentioned ranges. Also a flat cross section, Y
It is preferable to design so that the fineness of each filament and the number of single yarns in each of the mold sections are within the above-mentioned ranges. Furthermore, spinning conditions such as the discharge amount, cooling conditions immediately after discharge, and take-up speed may be adjusted according to the purpose.

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. In particular, an extruder-type spinning machine is 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. In the case of polyamide, a certain degree of orientation and crystallization is required in order to impart a high crimp in a later step, and therefore 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 for example, various crimping methods such as a jet nozzle type, a jet stuffer type, and a gear system may be adopted. The jet nozzle method is preferable in order to achieve the conversion. U.S. Pat. No. 3,781,949
The crimping nozzle described in the specification 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 is
Confounding can be imparted as necessary for improving the passability in a subsequent step. The confounding can be given by a known method. However, if too much confounding is imparted to the crimped yarn,
As described above, in order to impair the characteristics of the crimped yarn and impair the bulky property and the like, it is necessary to reduce the number to 20 yarns / m or less.

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. The crimped yarn for a carpet of the present invention particularly exhibits an effect 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 3 to 20 m.
m, preferably in the range of 8 to 15 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,
In the case where 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 preferable to apply an antifouling agent to the carpet of the present invention in order to enhance the antifouling property.

[0056]

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] A cross-sectional photograph of the crimped yarn was taken and enlarged to about A3 size. Next, all the single yarns printed on the copy paper were cut with scissors, and the weight of all the single yarns 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 yarn group is A, the number of single yarns is D, the weight of the Y-shaped cross section single yarn group is B, the number of single yarns is E, and the total fineness of the crimped yarn is C, the single fineness of the flat cross section = C × A / {(A + B) × D} Single fiber fineness of Y-shaped section = C × B / {(A + B) × E}.

[Crimp development rate after boiling water treatment] Room temperature 25
A crimped yarn unwound from a package left for 24 hours in an atmosphere at 60 ° C. and a relative humidity of 60% is subjected to 30
After immersion treatment in boiling water for minutes, dry to equilibrium moisture content,
This is used as a sample of the crimped yarn after the boiling water treatment. An initial load of 1.8 mg / dtex (2 mg / d) is applied to this sample yarn,
After a lapse of 0 seconds, a mark is made on a sample length of 50 cm (L ₁ ). Next, 90 mg / dtex (10
After applying a constant load of 0 mg / d) for 30 seconds, the length of the elongated sample (L ₂ ) is measured. Next, the crimp elongation rate (%) is determined by the following equation. 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. 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] The photograph of the cross-section of the 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 each radius 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.

[Rebound resilience of carpet] A carpet was prepared, and the resilience was evaluated by four ranks of 、, △, Δ, and × in descending order of evaluation by pushing with hand or stepping on. . △ or more is a pass.

[Hand of Carpet] A carpet was prepared, and the softness of the hand was relatively evaluated by touching with a hand. △ or more is a pass.

[Carpet bulkiness] The carpet was allowed to stand still on a sunny day outdoors in a place exposed to direct sunlight.
、, × were evaluated in four stages. △ or more is a pass.

[Durability of Carpet] The carpet was installed at the entrance of a general office, and after one week of use, the durability of the carpet was evaluated according to the degree of sagging.
△, △, and × were evaluated on a 4-point scale. △ or more is a pass.

[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 An extruder-type spinning of nylon 6 chips having a sulfuric acid relative viscosity of 2.8 was performed using a single die having two types of discharge holes for a flat cross section and a Y-shaped cross section. The filament was melt-spun with a machine to obtain a flat-section filament and a Y-section filament simultaneously. Here, two kinds of discharge holes were designed such that the flatness of the flat cross-section yarn became 4.5 and the deformation degree of the Y-shaped cross-section yarn became 4.0 by cooling after spinning. In addition, the shape of the discharge hole, the depth of the discharge hole, and the number of discharge holes were designed so that the discharge amount per single hole was almost the same. The number of discharge holes was 54 in a flat cross section and 34 in a Y-shaped cross section.

The two groups of spun yarns are aligned immediately after cooling and solidification, then refueled, stretched, and subsequently rolled without being wound up using a jet nozzle (JN), and then wound up. A polyamide multifilament crimped yarn having a total fineness of 1300 dtex and 88 filaments was obtained. Before winding, mild confounding shown in Table 1 was applied. The average crimp elongation of the obtained crimped yarn after boiling water treatment was 23%.
Met.

Next, a gauge,
The stitch was adjusted so that the basis weight was 1100 g / m ^2, and tufting was performed. Thereafter, staining and backing were performed according to a conventional method. Table 1 shows the evaluation results of the "rebound resilience", "feel", "bulkiness" and "durability" of the carpet thus obtained.

Example 2 An extruder-type spinning of nylon 6 chips having a sulfuric acid relative viscosity of 2.8 was performed using a single die having two types of discharge holes for a flat cross section and a Y-shaped cross section. The filament was melt-spun with a machine to obtain a flat-section filament and a Y-section filament simultaneously. Here, two kinds of discharge holes were designed such that the flatness of the flat cross-section yarn became 4.5 and the deformation degree of the Y-shaped cross-section yarn became 4.0 by cooling after spinning. In addition, the shape of the discharge hole, the depth of the discharge hole, and the number of discharge holes were designed so that the discharge amount per single hole was almost the same. The number of discharge holes was 54 in a flat cross section and 68 in a Y-shaped cross section.

The two groups of spun yarns are drawn together immediately after cooling and solidifying, then refueled, stretched, and subsequently rolled without being wound up using a jet nozzle (JN), and then wound up. A polyamide multifilament crimped yarn having a total fineness of 1800 dtex and 122 filaments was obtained.
Before winding, mild confounding shown in Table 1 was applied. The crimp elongation of the obtained crimped yarn after the boiling water treatment was 20 on average.
%Met.

Next, a gauge,
The stitch was adjusted so that the basis weight was 1100 g / m ^2, and tufting was performed. Thereafter, staining and backing were performed according to a conventional method. Table 1 shows the evaluation results of the "rebound resilience", "feel", "bulkiness" and "durability" of the carpet thus obtained.

Example 3 An extruder-type spinning of nylon 6 chips having a sulfuric acid relative viscosity of 2.8 was performed using a single die having two types of discharge holes for a flat cross section and a Y-shaped cross section. Melt spinning was performed by a machine to obtain a flat-section filament and a Y-section filament simultaneously. Here, two kinds of discharge holes were designed such that the flatness of the flat cross-section yarn became 4.5 and the deformation degree of the Y-shaped cross-section yarn became 4.0 by cooling after spinning. The fineness of the flat filament and the fineness of the Y-shaped cross-section filament are the same, and the number of single fibers in the flat cross-section is Y.
The shape of the discharge hole, the depth of the discharge hole, and the number of discharge holes were designed so as to be twice the number of single fibers in the mold cross section. The number of discharge holes is 6 for a flat cross section.
There were four pieces and 32 Y-shaped cross sections.

The two groups of spun yarns are drawn together immediately after cooling and solidifying, then refueled, stretched, and subsequently rolled without being wound up using a jet nozzle (JN) and then wound up. A polyamide multifilament crimped yarn having a total fineness of 1300 dtex and 96 filaments was obtained. Before winding, slight confounding was applied. The crimp elongation of the obtained crimped yarn after the boiling water treatment was 16% on average.

Next, a gauge,
The stitch was adjusted so that the basis weight was 1100 g / m ^2, and tufting was performed. Thereafter, staining and backing were performed according to a conventional method. Table 1 shows the evaluation results of the "rebound resilience", "feel", "bulkiness" and "durability" of the carpet thus obtained.

Example 4 A crimped polyamide multifilament yarn of 96 filaments having a total fineness of 1300 dtex and an average elongation of 4.5% was obtained by reducing the degree of crimping in Example 3. . Before winding, slight confounding was applied. Then, the tuft was adjusted by a normal level cut by adjusting the stitch so that the gauge and the basis weight became 1100 g / m ² . Thereafter, staining and backing were performed according to a conventional method. The “rebound resilience”, “feel”, “bulkyness” of the carpet thus obtained,
Table 1 shows the results of evaluating “durability”.

Example 5 A crimped polyamide multifilament yarn having a total fineness of 1300 dtex and 96 filaments having an average crimp elongation of 30% was obtained by tightening the crimp in Example 3. Before winding, slight confounding was applied. Then, the tuft was adjusted by a normal level cut by adjusting the stitch so that the gauge and the basis weight became 1100 g / m ² . Thereafter, staining and backing were performed according to a conventional method. The “rebound resilience”, “feel”, “bulkyness” of the carpet thus obtained,
Table 1 shows the results of evaluating “durability”. As is clear from the results in Table 1, in the examples of the present invention,
In each case, the resilience, texture, bulkiness and durability of the carpet were all satisfactory levels.

[Comparative Examples 1 to 5] In Example 3, the case where the flatness of the flat cross-section yarn was 1.5 was compared with Comparative Example 1, and the case where the flatness was 7.5 was compared. Example 2,
The case where the degree of deformation of the Y-shaped section yarn was set to 1.8 was set as Comparative Example 3, and the case where the degree of deformation was set to 6.5 was set as Comparative Example 4. In Example 4, the number of confounds was 23 pieces / m.
Comparative Example 5 was a case where the confounding treatment was so tight that

These were tufted in the same manner as in Example 3 by adjusting the stitch so that the gauge and the basis weight became 1100 g / m ² by ordinary level cut. Thereafter, staining and backing were performed according to a conventional method. Table 1 shows the evaluation results of the "rebound resilience", "feel", "bulkiness" and "durability" of the carpet thus obtained.

In Comparative Example 1, since the flatness was small,
I couldn't feel the soft touch. Further, in Comparative Example 2, durability was impossible due to the large flatness. In Comparative Example 3, since the degree of deformation was small, the bulkiness was insufficient. In Comparative Example 4, the degree of deformation was large, so that durability was not possible. In Comparative Example 5, the carpet was transparent through the ground because the number of confounds was too large, and the bulkiness was insufficient.

[0082]

[Table 1]

[0083]

The crimped yarn for carpet of the present invention can provide a carpet having sufficient rebound resilience, bulkiness and durability while having a soft touch 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, a line carpet, and a household carpet.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a flat cross-section multifilament constituting a crimped yarn of the present invention.

FIG. 2 is a cross-sectional view showing another example of the flat cross-section multifilament constituting the crimped yarn of the present invention.

FIG. 3 is a cross-sectional view showing an example of a Y-shaped cross-section multifilament constituting a crimped yarn of the present invention.

[Explanation of symbols]

 a Long side of flat cross section single yarn b Short side of flat cross section single yarn c Radius of circumscribed circle of Y cross section yarn d Radius of inscribed circle of Y cross section thread

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) D01F 6/60 321 D01F 6/60 321A // D02G 1/16 D02G 1/16 F term (reference) 3B120 AA15 AA34 AA35 BA15 DB03 EB15 4L035 BB31 BB65 DD02 DD18 EE20 FF08 4L036 MA06 MA20 MA33 PA12 PA33 PA41 PA42 RA04 UA01 UA07 UA08 UA30 4L045 AA05 BA03 BA12 BA14 BA36 BA43 BA60 CA29 CB09 CB19 DA09

Claims (7)

[Claims] 1. A crimped yarn comprising a mixture of a flat multifilament having a flatness Rf satisfying the following formula and a Y-shaped multifilament having a deformation degree Rm, wherein the number of entanglements is 20 /
m, and the polymer constituting the crimped yarn is polyamide. (1) 2.0 ≦ Rf ≦ 7.0 (2) 2.0 ≦ Rm ≦ 6.0 2. The monofilament fineness Am of a flat cross section multifilament, the number of single yarns An, the single fiber fineness Bm of a Y-shaped multifilament multifilament, and the number of single yarns Bn satisfy the following relationship. Crimped yarn for carpet. (3) 1 / 1.15 ≦ (Bm × Bn) / (Am × A
n) ≦ 1.15 (4) 1.5 ≦ Bm / Am 3. The crimped yarn has a total fineness of 600 to 2000 dte.
3. The crimped yarn for carpet according to claim 1, wherein x is equal to or less than x. 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, which is 28% or less. 5. A carpet, wherein the crimped yarn for carpet according to any one of claims 1 to 4 is used in at least 80% of a pile constituting the carpet. 6. The carpet according to claim 5, wherein the carpet is an optional carpet, a roll carpet, a line carpet, or a household carpet. 7. The carpet according to claim 5, wherein the pile is non-twisted and is a cut pile.