JP2005023495A - Doubled and twisted yarn for carpet and carpet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a doubled and twisted yarn for forming a carpet that has both aesthetic appearance of the pencil point-like pattern and high cushioning properties with soft feeling and compression recovery, light resistance, antifouling properties, and provide the carpet by using the doubled and twisted yarn. <P>SOLUTION: (1) The doubled and twisted yarn for carpet comprises two or more filament yarns that are twisted or more filament yarns where the doubled and twisted yarn contains false-twisted yarns including polytrimethylene terephthalate fiber. (2) The doubled and twisted yarn for carpet contains the false twisted yarn including the polytrimethylene terephthalate fiber in an amount of 20 to 80 wt.%. (3) The doubled and twisted yarn for carpet comprises at least one filament yarn that is false-twisted and includes at least polytrimethylene terephthalate fiber and the others are polyethylene terephthalate fibers. (4) In the carpet, the doubled and twisted yarn is used as a pile yarn. (5) In the carpet, the pile yarn is used in the form of cut pile. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a carpet twisted yarn and a carpet, and more specifically, a carpet twisted yarn in which two or more fiber yarns including a false twisted yarn of polytrimethylene terephthalate fiber are twisted, and this is used as a pile yarn. The present invention relates to a carpet that has a pencil point-like aesthetic appearance and high cushioning properties, and has a soft texture and excellent compression recovery, light resistance, and antifouling properties.

Conventionally, as synthetic fiber filaments used for carpet pile yarns, nylon fibers that have been crimped by a BCF (Bulked Continuous Filament) method have been used. In particular, cut pile tufted carpets using twisted yarns such as saxony and hard twist are characterized by a unique appearance and texture due to the pencil point-like pile.
However, because these piles are twisted, they are inferior to the bulky nature of the piles, feel the bottom when you step on the carpet, and cushioning (walking comfort) is one of the important performance requirements of tufted carpets. ) Was insufficient. In order to improve the bulkiness, a method using false twisted yarn instead of BCF may be considered. However, conventional nylon fibers and polyethylene terephthalate fibers have a weak crimping ability in the twisted state, and the bulkiness is insufficient. .
Nylon fibers are excellent in hair fall resistance and color developability, but have the disadvantages that they are hydrophilic, so that they are difficult to remove stains from foods such as ketchup, sauce and juice, and are inferior in light resistance.

Polyethylene terephthalate fibers, on the other hand, have inferior resistance to hair fall, have the disadvantage that piles fall over and do not recover after a short period of use, and because the texture is hard, they are rarely used as carpet pile yarns. Absent.
Patent Document 1 discloses a carpet made of BCF yarn of polytrimethylene terephthalate fiber, and describes that it is excellent in antifouling property, texture retention, and resistance to crushing, but is insufficient in cushioning properties. It was something.
As described above, a carpet having a pencil point-like aesthetic appearance and excellent cushioning property (walking comfort), antifouling property and durability has not been proposed yet.
Japanese National Patent Publication No. 10-502139

  The object of the present invention is to solve the above-mentioned problems of the prior art, and to obtain a carpet having a pencil point-like aesthetic appearance and high cushioning properties, and has a soft texture and excellent compression recovery, light resistance and antifouling properties. An object of the present invention is to provide a carpet twisted yarn and a carpet using the same.

As a result of intensive studies on the above problems, the present inventors have used the above-mentioned problems by using, as pile yarn, a twisted yarn obtained by twisting two or more fiber yarns including a false twisted yarn of polytrimethylene terephthalate fiber. The inventors have found that this can be achieved and have completed the present invention.
That is, the invention claimed in the present application is as follows.

(1) A carpet twisted yarn in which two or more fiber yarns are twisted, and the twisted yarn contains a false twisted yarn containing polytrimethylene terephthalate fiber.
(2) The carpet twisted yarn according to (1), wherein a content of the false twisted yarn containing polytrimethylene terephthalate fiber in the twisted yarn is 20 to 80% by weight.
(3) The fiber yarn is at least one false twisted yarn containing polytrimethylene terephthalate fiber, and the other is a false twisted yarn containing polyethylene terephthalate fiber (1) or (2) Synthetic yarn for carpet.
(4) A carpet, wherein the carpet twisted yarn according to any one of (1), (2) and (3) is used as a pile yarn.
(5) The carpet according to (4), wherein the pile yarn is a cut pile.

Since the false twisted yarn containing polytrimethylene terephthalate fiber is used for the carpet twisted yarn according to claims 1 to 3 of the present application, the twisted yarn exhibits a large bulkiness by heat treatment such as dyeing. Can do. Therefore, by using this twisted yarn for carpet pile yarn, it has a pencil point-like aesthetic appearance and high cushioning (walking comfort), and has a soft texture and excellent compression recovery, light resistance, and antifouling properties. Can get a carpet.
Further, since the bulkiness of the pile yarn is greatly expressed after dyeing, an effect that the pile yarn is difficult to come off from the base fabric particularly in the cut pile can be obtained.
Furthermore, by mixing with false twisted yarn containing polyethylene terephthalate fiber, etc., greater bulkiness can be obtained, and a differently colored carpet or a deeply colored carpet utilizing the different dyeing property can be obtained.

Hereinafter, the present invention will be described in detail.
The carpet twisted yarn of the present invention is obtained by twisting two or more fiber yarns, and false twist yarns containing polytrimethylene terephthalate fibers are used for the fiber yarns.
The polytrimethylene terephthalate fiber used in the present invention refers to a polyester fiber having a trimethylene terephthalate unit as a main repeating unit. The trimethylene terephthalate unit is about 50 mol% or more, preferably 70 mol% or more, and more preferably 80 mol. % Or more, more preferably 90 mol% or more. Accordingly, the total amount of the other acid component and / or glycol component as the third component is in the range of about 50 mol% or less, preferably 30 mol% or less, more preferably 20 mol% or less, and even more preferably 10 mol% or less. Includes included polytrimethylene terephthalate.
The strength of the polytrimethylene terephthalate fiber is preferably 2 to 5 cN / dtex, more preferably 2.5 to 4.5 cN / dtex, still more preferably 3 to 4.5 cN / dtex. Further, the elongation is preferably 30 to 60%, more preferably 35 to 55%, and still more preferably 40 to 55%. The initial tensile resistance is preferably 30 cN / dtex or less, more preferably 10 to 30 cN / dtex, still more preferably 12 to 28 cN / dtex, and particularly preferably 15 to 25 cN / dtex. Further, the elastic recovery rate at 10% elongation is preferably 70% or more, more preferably 80% or more, still more preferably 90% or more, and most preferably 95% or more.

Polytrimethylene terephthalate is synthesized by the polycondensation of terephthalic acid or a functional derivative thereof such as dimethyl terephthalate with trimethylene glycol or a functional derivative thereof in the presence of a catalyst under suitable reaction conditions. Is done. In this synthesis process, a suitable one or two or more third components may be added to form a copolyester. Polyesters other than polytrimethylene terephthalate such as polyethylene terephthalate and polybutylene terephthalate, nylon and polytrimethylene. After methylene terephthalate is synthesized separately, it may be blended or composite spun (sheath core, side-by-side, etc.).
Third components that can be added include aliphatic dicarboxylic acids (oxalic acid, adipic acid, etc.), alicyclic dicarboxylic acids (cyclohexanedicarboxylic acid, etc.), aromatic dicarboxylic acids (isophthalic acid, sodium sulfoisophthalic acid, etc.) ), Aliphatic glycols (ethylene glycol, 1,2-propylene glycol, tetramethylene glycol, etc.), alicyclic glycols (cyclohexanedimethanol, etc.), and aliphatic glycols containing aromatics (1,4-bis (β-hydroxy) Ethoxy) benzene, etc.), polyether glycol (polyethylene glycol, polypropylene glycol etc.), aliphatic oxycarboxylic acid (ω-oxycaproic acid etc.), aromatic oxycarboxylic acid (P-oxybenzoic acid etc.) and the like. In addition, compounds having one or three or more ester-forming functional groups (such as benzoic acid or glycerin) can also be used within the range where the polymer is substantially linear.
Further, polytrimethylene terephthalate fibers include matting agents such as titanium dioxide, stabilizers such as phosphoric acid, ultraviolet absorbers such as hydroxybenzophenone derivatives, crystallization nucleating agents such as talc, lubricants such as aerosil, and hindered phenols. Antioxidants such as derivatives, flame retardants, antistatic agents, pigments, fluorescent brighteners, infrared absorbers, antifoaming agents, and other modifying agents may be added.

As the polytrimethylene terephthalate fiber, latent crimp-expressing polyester fiber compositely spun into a sheath core type or a side-by-side type may be used. In the present invention, the latent crimp-expressing polyester fiber is composed of at least two kinds of polyester components (specifically, many are joined to a side-by-side type or an eccentric core-sheath type), The one that develops crimp by heat treatment. There are no particular limitations on the composite ratio of the two polyester components (generally many are in the range of 70/30 to 30/70 by mass%) and the joint surface shape (there is a straight or curved shape). The total fineness is preferably 20 to 300 dtex, and the single yarn fineness is preferably 0.5 to 20 dtex, but is not limited thereto.
When using a latent crimp-expressing polyester fiber, polytrimethylene terephthalate is used as at least one component.
Specific examples thereof include polytrimethylene terephthalate as one component as disclosed in JP-A-2001-40537. For example, it is a composite fiber in which two types of polyester polymers are joined in a side-by-side type or an eccentric core-sheath type, and in the case of a side-by-side type, the melt viscosity ratio of the two types of polyester polymers is preferably 1.00 to 2.00, In the case of the eccentric core-sheath type, it is preferable that the sheath polymer and the core polymer have an alkali weight loss rate ratio of 3 times or more and the sheath polymer is fast.

  Specific polymer combinations include polytrimethylene terephthalate (polyester having terephthalic acid as the main dicarboxylic acid and 1,3-propanediol as the main glycol component, glycols such as ethylene glycol and butanediol, and isophthalic acid. , Dicarboxylic acids such as 2,6-naphthalenedicarboxylic acid, etc. may also be copolymerized, and other polymers, matting agents, flame retardants, antistatic agents, pigments and other additives may be included.) And polyethylene terephthalate (polyester containing terephthalic acid as the main dicarboxylic acid and ethylene glycol as the main glycol component, copolymerized with glycols such as butanediol, isophthalic acid, and dicarboxylic acids such as 2,6-naphthalenedicarboxylic acid) Also, other polymers, matte , Flame retardants, antistatic agents, pigments and other additives), polytrimethylene terephthalate and polybutylene terephthalate (terephthalic acid as the main dicarboxylic acid, and 1.4-butanediol Polyester as the main glycol component, which may be copolymerized with glycols such as ethylene glycol, diphthalic acid such as isophthalic acid, 2.6-naphthalenedicarboxylic acid, etc. Other polymers, matting agents, flame retardants In addition, an additive such as an antistatic agent and a pigment may be contained.) In particular, it is preferable that polytrimethylene terephthalate is disposed inside the crimp.

Further, as latent crimp-expressing polyester fibers, JP-B No. 43-19108, JP-A No. 11-189923, JP-A No. 2000-239927, JP-A No. 2000-256918, JP-A No. 2000-328382, For example, the first component is polytrimethylene terephthalate, and the second component is a polyester such as polytrimethylene terephthalate, polyethylene terephthalate, or polybutylene terephthalate described in Japanese Patent Application Laid-Open No. 2001-81640. Alternatively, a fiber that is compound-spun into a side-by-side type or an eccentric sheath-core type may be used. In particular, a combination of polytrimethylene terephthalate and copolymerized polytrimethylene terephthalate, or a combination of two types of polytrimethylene terephthalate having different intrinsic viscosities is preferable.
The initial crimp resistance of the latently crimpable polyester fiber is preferably 10 to 30 cN / dtex, more preferably 20 to 30 cN / dtex, and still more preferably 20 to 27 cN / dtex. In addition, it is difficult to manufacture a material having a density of less than 10 cN / dtex.

Moreover, it is preferable that the heat shrink stress in 100 degreeC is 0.1-0.5 cN / dtex, 0.1-0.4 cN / dtex is more preferable, 0.1-0.3 cN / dtex is further more preferable. Production of fibers exceeding 0.5 cN / dtex is difficult.
The expansion / contraction elongation rate of the actual crimp is preferably 10 to 100%, more preferably 10 to 80%, and further preferably 10 to 60%. The elastic modulus of the actual crimp is preferably 80 to 100%, more preferably 85 to 100%, and still more preferably 85 to 97%.
Furthermore, the expansion / contraction elongation after the hot water treatment is preferably 100 to 250%, more preferably 150 to 250%, and further preferably 180 to 250%. Production of more than 250% fiber is difficult. The elastic modulus after the hot water treatment is preferably 90 to 100%, more preferably 95 to 100%.
Here, the expansion / contraction elongation rate and the expansion / contraction elastic modulus are measured according to JIS-L-1090, a stretchability test method (Method A). As a treatment method before measurement, the stretch elongation and elastic modulus of the actual crimp are those obtained by immediately measuring the yarn unwound from the winding package, and the stretch elongation and elastic modulus after the hot water treatment are: The yarn was measured after being dipped in hot water at 98 ° C. for 20 minutes under no load and then dried for 24 hours under no load.

Examples of latently crimpable polyester fibers having such characteristics include composite fibers composed of single yarns in which two types of polytrimethylene terephthalates having different intrinsic viscosities are combined in a side-by-side manner.
The difference in intrinsic viscosity between the two types of polytrimethylene terephthalate is preferably 0.05 to 0.4 (dl / g), particularly 0.1 to 0.35 (dl / g), and further 0.15 to 0. .35 (dl / g) is preferable. For example, when the intrinsic viscosity on the high viscosity side is selected from 0.7 to 1.3 (dl / g), the intrinsic viscosity on the low viscosity side is selected from 0.5 to 1.1 (dl / g). Is preferred. The intrinsic viscosity on the low viscosity side is preferably 0.8 (dl / g) or more, particularly preferably 0.85 to 1.0 (dl / g), more preferably 0.9 to 1.0 (dl / g). Is preferred.
The average intrinsic viscosity of the composite fiber is preferably 0.7 to 1.2 (dl / g), and more preferably 0.8 to 1.2 (dl / g). In particular, 0.85 to 1.15 (dl / g) is preferable, and 0.9 to 1.1 (dl / g) is more preferable.

In addition, the value of the intrinsic viscosity as used in the present invention refers to the viscosity of the yarn being spun, not the polymer used. This is because polytrimethylene terephthalate is more susceptible to thermal decomposition than polyethylene terephthalate and the like, and even if a polymer with a high intrinsic viscosity is used, the intrinsic viscosity is significantly reduced by thermal decomposition. This is because it is difficult to maintain a large difference in intrinsic viscosity.
In the present invention, the polytrimethylene terephthalate fiber yarn is produced by melt spinning the above polyester having an intrinsic viscosity of 0.7 to 1.5, preferably 0.8 to 1.2, to 2000 m / min. It is preferable to use partially oriented undrawn yarn (POY) obtained by taking up at a winding speed of 2500 to 4000 m / min. In this case, the false false twisting method is naturally applied for false twisting. POY is generally called a partially oriented yarn, a partially oriented undrawn yarn, or a highly oriented undrawn yarn.

The polytrimethylene terephthalate fiber yarn was wound at a winding speed of about 1500 m / min to obtain an undrawn yarn, and then the method of spinning at about 2 to 3.5 times, and the spinning-twisting step were directly connected. It can also be produced by a known method such as a straight rolling method (spin draw method) or a high speed spinning method (spin take-up method) with a winding speed of 5000 m / min or more.
The form of the polytrimethylene terephthalate fiber is not particularly limited, but typically, a continuous filament yarn (long fiber) composed of a plurality of single yarns is used. Further, the fiber may have a single yarn whose cross section is uniform or thick in the length direction, and its cross-sectional shape is round, triangular, L-shaped, T-shaped, Y-shaped, W-shaped, Yaba-shaped. It may be a polygonal shape such as a flat shape or a dogbone shape, a multi-leaf shape, a hollow shape, or an irregular shape.
The thickness of the single yarn is preferably about 0.1 to 10 dtex, and more preferably 2 to 10 dtex in order to obtain high elongation recovery.

In the present invention, the false twisted yarn containing polytrimethylene terephthalate fiber (hereinafter referred to as polytrimethylene terephthalate false twisted yarn) has a stretch elongation ratio of 40% or more after heat treatment under a load of 1.76 × 10 ⁻³ cN / dtex. Preferably, it is 50% or more, more preferably 60% or more. The larger the stretch / extension rate, the higher the bulkiness of the twisted yarn containing the false twisted yarn. However, if the false twisting temperature or the number of false twists is too high and the crimp becomes excessively large, the strength and elongation of the false twisted yarn will decrease, causing problems in the strength of the fabric. Is preferably 200% or less.
The elastic modulus is preferably 70% or more, more preferably 80 to 90%, and still more preferably 90 to 100%.
Here, the stretch elongation rate and elastic modulus of the false twisted yarn were subjected to a dry heat treatment at 90 ° C. for 15 minutes under a load of 1.764 × 10 ⁻³ cN / dtex, and left for 24 hours under no load. -L-1090, the value measured according to the elasticity test method (Method A).

In the present invention, the polytrimethylene terephthalate false twisted yarn preferably has a crimp number satisfying a crimp coefficient of 100 to 200, preferably 110 to 160 defined by the following formula.
Crimp coefficient = crimp number (pieces / cm) × [fineness of false twisted yarn (dtex)] ^1/2
The number of crimps is determined by the following measurement method.
The sample is treated with a dry heat of 90 ° C. for 15 minutes under a load of 2.6 × 10 ⁻⁴ cN / dtex and left undisturbed for a whole day and night. Thereafter, the single yarn filament was taken out without extending the crimp, and an initial load of 1.764 × 10 ⁻³ cN / dtex (2 mg / d) per unit fineness of the sample was applied to reduce the crimp per 25 mm of the sample length. The total number of peaks and valleys is counted, and the value divided by 2 is defined as the number of crimps and converted to the number of crimps per unit length (pieces / cm). The measurement is performed 10 times, and the average value is calculated.

A false twisted yarn having a sufficient number of crimps obtained by false twisting a polytrimethylene terephthalate fiber alone has a sufficiently large number of crimps, so that the crimp coefficient satisfies 100 or more, and the composite yarn has high crimpability. . On the other hand, yarns that have been false twisted after compounding other fibers have to be reduced in the number of false twists as much as the total fineness of the yarn to be falsely twisted. In some cases, the number of crimps is reduced and the crimp coefficient is less than 100.
The false twisting can be performed by a known method such as a general pin type, friction type, nip belt type, and air twist type. Either one heater false twist or two heater false twist may be used, but one heater false twist is preferable in order to obtain high crimpability.

The false twist heater temperature is such that the yarn temperature immediately after the exit of the first heater is preferably in the range of 100 ° C. to 200 ° C., more preferably 120 ° C. to 180 ° C., and even more preferably 130 ° C. to 170 ° C. It is preferable to set the heater temperature.
If necessary, a two-heater false twisted yarn may be used, and the second heater temperature in that case is preferably 100 ° C. or higher and 210 ° C. or lower, more preferably −30 ° C. with respect to the yarn temperature immediately after the outlet of the first heater. The temperature is preferably in the range of + 50 ° C. or lower. The overfeed rate (second overfeed rate) in the second heater is preferably + 3% or more and + 30% or less.
The false twist number T may be in a range normally used in false twisting of polyethylene terephthalate-based polyester fibers, and is calculated by the following formula. In this case, the value of the false twist coefficient K is preferably in the range of 18500 to 37000, and the preferred false twist number T is determined by the thickness of the false twist yarn.
T (T / m) = K / [fineness of false twisted yarn (dtex)] ^1/2

The twisted yarn for carpet of the present invention is a twisted yarn in which two or more fiber yarns are twisted, and needs to contain a polytrimethylene terephthalate false twisted yarn. That is, all the fiber yarns constituting the twisted yarn may be polytrimethylene terephthalate false twisted yarn, or may be a twisted yarn of polytrimethylene terephthalate false twisted yarn and other fibers.
Polytrimethylene terephthalate false twisted yarn has a strong crimping ability under high load, so that it can be wound in a restrained state like a yarn in which multiple yarns are twisted together for carpet pile. The amount of contraction is large, and high bulkiness can be expressed. Instead of polytrimethylene terephthalate false twisted yarn, when using crimped yarn made of other fibers (for example, BCF yarn or false twisted yarn made of polyethylene terephthalate fiber or nylon fiber) or polytrimethylene terephthalate fiber BCF yarn, Since the crimp development force under load is weak, it is not possible to obtain the carpet twisted yarn targeted by the present invention.

  The polytrimethylene terephthalate false twisted yarn used in the present invention is a false twisted yarn composed of 100% polytrimethylene terephthalate fiber (compounding polytrimethylene terephthalate fibers having different physical properties such as Young's modulus, elongation and dyeability, for example, The so-called elongation difference false twist, feed difference, and phase difference false twist of polytrimethylene terephthalate fibers having different elongations are optimal. However, if necessary, the mixing ratio is 50% or less, preferably 30%. In the following range, it may be combined with other fibers (fibers exemplified as the following other fibers) and known composite means (compositing method exemplified as the following other fibers).

  There are no particular restrictions on the type of other fibers to be twisted with the polytrimethylene terephthalate false twisted yarn, for example, polyesters such as nylon, polyethylene terephthalate, polybutylene terephthalate, synthetic fibers such as acrylic and polypropylene, rayon, cupra, acetate, etc. Any of chemical fibers or natural fibers such as cotton, hemp, wool and silk may be used. Either short fibers or long fibers may be used. In the case of long fibers, bulky processed yarns such as using original yarns, BCF yarns, stuffing yarns, false twisting yarns and fluid jetting yarns, design yarns such as slab yarns, etc. Any of these may be used, and these fibers may be used in combination. Of these, the use of false twisted yarn containing polyethylene terephthalate fiber is most preferred. As for the composite method, various conventionally known composite methods can be used. For example, twisted twist, mixed fiber, mixed spinning (including silo span, silofil), composite false twist (elongation difference, feed difference, phase difference false twist) ), Simultaneous feed or feed differential fluid injection processing.

  As the carpet twisted yarn of the present invention, a twisted yarn composed of 100% polytrimethylene terephthalate false twisted yarn is optimal in terms of functionality such as cushioning and compression recovery when used in carpet pile yarn. However, the polytrimethylene terephthalate false twisted yarn is finer than the polyethylene terephthalate false twisted yarn or nylon false twisted yarn, and the single fibers are easily entangled with each other. Although the degree of yarn opening is small and the crimp expression is large, the bulkiness tends not to be so large. Therefore, a method of increasing the bulkiness due to a difference in crimp form or heat shrinkability by combining with other fibers is effective. Further, by combining with other fibers, it is possible to make a carpet of different colors that take advantage of the different dyeing properties.

In the present invention, the content of the polytrimethylene terephthalate false twisted yarn in the composite yarn when composited with other fibers is preferably 20 to 80% by mass, and more preferably 30 to 70% by mass. If the content is less than 20% by mass, the cushioning properties and compression recoverability may be inferior when used for carpet pile yarn.
Polytrimethylene terephthalate false twisted yarn and other fibers are manufactured separately, and then both fibers are arranged in an appropriate number and mixed by the interlace method, and then twisted (including the lower twist and the upper twist). It is preferable to make a twisted yarn for carpet with a desired fineness, but after aligning the polytrimethylene terephthalate fiber and other fibers, interlaced if necessary and simultaneously false twisting, then align the appropriate number A method of twisting may be used.
The former method is preferred in order to increase the bulkiness by utilizing the high crimpability of the polytrimethylene terephthalate false twisted yarn. The reason for this is that when polytrimethylene terephthalate fiber and other fibers are combined first and then false twisted compared to the case where polytrimethylene terephthalate fiber is falsely twisted alone, the total fineness of false twisted yarn This is because the number of false twists must be reduced by the amount of increase in the thickness of the polytrimethylene terephthalate fiber, so that the crimp of the polytrimethylene terephthalate fiber becomes relatively sweet and the bulkiness tends to decrease.

As for the number of twisted yarns for carpets of the present invention, it is preferable to twist so that the twist coefficient K ′ calculated by the following formula is in the range of 2500 to 18000, more preferably 5000 to 15000, and 7500 to 12000. Further preferred.
Number of twisted yarns (T / m) = K ′ / (Fineness of double twisted yarn (dtex)) ^1/2
In addition, in the case of applying the upper twist by further aligning the twisted yarns with the lower twist, the ratio of the upper twist number / the lower twist number is 0.5 to 1.5 in the opposite direction to the lower twist. It is preferable to apply an upper twist, 0.7 to 1.3 is more preferable, and 0.8 to 1.0 is more preferable.

When interlace blending polytrimethylene terephthalate false twisted yarn and other fibers, if the number of entanglement is too large, it may inhibit the expression of crimp of polytrimethylene terephthalate false twisted yarn, so the number of entanglement is 50 / m or less. Is preferably 40 pieces / m or less, more preferably 30 pieces / m or less.
The carpet twisted yarn of the present invention is preferably heat-set for twisting and pre-bulkying before being tufted onto the carpet by a tufting machine or the like. The heat setting method may be a known method such as a continuous heat setting method (a method in which steam setting and dry heat setting are continuously performed in a relaxed state) or an autoclave, which is usually used for carpet yarn sets. 60-160 degreeC is preferable, 80-150 degreeC is more preferable, and 100-140 degreeC is further more preferable.

The fineness of the fiber yarn (that is, the fiber yarn before twisting) constituting the carpet twisted yarn of the present invention is preferably 40 to 400 dtex, more preferably 80 to 350 dtex, still more preferably 150 to 350 detex. The total fineness of the twisted yarn is preferably 400 to 5000 dtex, more preferably 600 to 400 dtex, and still more preferably 1500 to 3000 dtex.
In the carpet of the present invention, the above-described twisted yarn is used as a pile yarn. The pile yarn is preferably a cut pile. In this case, the amount of the twisted yarn used is preferably 30 to 100% of the total pile amount, more preferably 50 to 100%, and still more preferably 70 to 100%.

The pile shape of the carpet is not particularly limited. For example, any of cut types such as plush, velor, saxony, hard twist, shaggy, hair, loop type such as level loop, multi-level loop, hi-lo loop, and cut and loop type It may be. The carpet of the present invention may be a carpet using a twisted yarn as a pile yarn, and may be any of Wilton carpet, tufted carpet, tile carpet, hook drag, Akisminster carpet, and the like.
The carpet of the present invention may use pre-dyed yarn (koji dyeing, cheese dyeing, muff dyeing, etc.), or product dyeing (anti-dyeing, print dyeing, etc.) after the carpet is manufactured.

  The carpet twisted yarn and carpet of the present invention have, for example, a pencil point-like aesthetic appearance and high cushioning properties, and have a soft texture and excellent compression recovery, light resistance, and antifouling properties. It is useful as an indoor / outdoor carpet.

Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited thereto. The evaluation in the examples was performed by the following method.
1) Intrinsic viscosity [η]: determined based on the definition of the following formula.
[Η] = lim (ηr−1) / C
C → 0
Ηr in the definition is a value obtained by dividing the viscosity at 35 ° C. of a diluted polymer solution dissolved in an o-chlorophenol solvent with a purity of 98% or more by the viscosity of the solvent measured at the same temperature, and is defined as a relative viscosity. It is what has been. C is the polymer concentration expressed in g / 100 ml.
2) Strength, elongation, and initial tensile resistance: Measured according to JIS-L-1013, a test method for tensile strength, elongation, and initial tensile resistance of the chemical fiber filament yarn test method. The measurement was performed 10 times for each sample, and the average value was calculated.
3) Elastic recovery rate at 10% elongation: An initial load of 8.82 × 10 ⁻² cN / dtex was applied to the sample, the sample was stretched at a constant rate of 20% per minute, and immediately when the elongation reached 10%. Shrink at the same speed to draw a stress-strain curve. During shrinkage, the residual elongation when the stress decreased to 8.82 × 10 ⁻² cN / dtex equal to the initial load was defined as L (%) and calculated by the following formula.
Elastic recovery rate at 10% elongation (%) = [(10−L) / 10] × 100
The measurement was performed 10 times for each sample, and the average value was calculated.

4) Bulkiness of plied yarn: Measured according to JIS-L-1095, the bulkiness evaluation method (Method A) of the general spun yarn test method, with 100 yarns arranged in parallel. The sample was subjected to hydrothermal treatment (98 ° C. × 30 minutes) with no load, dehydrated and dried, and a twisted yarn left for 24 hours was used.
5) Thickness retention and recovery by static load: JIS-L-1022, Test method for thickness reduction by short-time / medium static load in test method for thickness reduction by load of fiber floor covering The test was conducted according to the above. However, the pressurizer had a diameter of 43 mm (area 1452 mm ² ) and a load of 312.8 N (31.9 kgf). The measurement is to measure the initial thickness when an initial load of 1.96 kPa is applied, the thickness after 2 hours in the loaded state, and the thickness after a predetermined time after dewetting. Calculated.
Thickness retention (%) = [(t ₀ −tn) / t ₀ ] × 100
t ₀ : initial thickness (mm)
tn: Thickness after 2 hours under load or thickness after a predetermined time after dewetting
(Mm)

6) Cushioning property (walking comfort): Using a compression tester (servo pulsar manufactured by Shimadzu Corporation) that can pressurize and depressurize at a constant speed, attach a pressurizer with a diameter of 100 mm and compress the carpet at a speed of 10 mm / sec. When the load of 1.69 kN (stress is 215 kPa) is applied, it is immediately restored at the same speed. Compressive energy and degeneracy energy were calculated from the obtained load-displacement curve, and linearity and hysteresis loss were calculated by the following equations. However, the linear energy in the equation is an area surrounded by a straight line drawn from the stress rising point to the maximum stress point, a perpendicular passing through the maximum stress point, and the x-axis.
Linearity = Compression energy / Linear energy Hysteresis loss (%) = [(Compression energy−Deweight energy) / Compression energy] × 100
The higher the degree of linearity, the lower the feeling of bottoming when stepping on the carpet, and the smaller the hysteresis loss, the greater the repulsive force after stepping on the carpet, so the cushioning property is higher (ie walking comfort is higher).

7) Light resistance: According to JIS-L-0842, a dyeing fastness test method for ultraviolet carbon arc lamp light, a light resistance test was performed at 63 ° C. for 40 hours, and graded 1-5 with a faded gray scale. .
8) Antifouling property: A commercially available ketchup was dropped on the carpet surface, and the degree of contamination after wiping with a cotton towel was graded from 1 to 5.
5th grade: No dirt 4th grade: almost no dirt 3rd grade: Dirt remains a little 2nd grade: Dirt is noticeable 1st grade: Dirt is very noticeable

Polytrimethylene terephthalate having an intrinsic viscosity [η] = 0.9 was spun at a spinning temperature of 285 ° C. and a winding speed of 3000 m / min to obtain POY with 196 dtex / 72f and a breaking elongation of 90%. Next, using a nip belt type false twisting machine Mach 33H manufactured by Murata Machinery Co., Ltd., false twisting is performed under the following false twisting conditions, and two adjacent false twisted yarns are aligned and wound up before winding, 333 dtex / A 1-heater drawn false twisted yarn of 144 f was obtained.
Processing speed: 400 m / min Drawing ratio: 1.225 times False twisting heater temperature: 170 ° C (yarn temperature immediately after heater outlet: 168 ° C)
Twister belt angle: 115 degrees (number of false twists: 2500 T / m)
False twist direction: Z
The obtained false twisted yarn has a strength of 2.6 cN / dtex, an elongation of 55.2%, an initial tensile resistance of 17.8 cN / dtex, a stretch elongation of 62.1%, and a stretch elastic modulus of 88.6%. The number of crimps was 9.6 pieces / cm, and the crimp coefficient was 124 (the fineness of the false twisted yarn was calculated at 167 dtex).

Next, the three false twisted yarns obtained were aligned and subjected to air entanglement (number of entanglement 23 / m) with an interlace nozzle to combine them, and then two obtained combined yarns were obtained using a ring twisting machine. Were twisted at 180 T / m in the Z direction, and one twisted yarn was further aligned on the obtained twisted yarn, and 180 T / m was twisted in the Z direction. Furthermore, a continuous heat set machine (TVP-2S) manufactured by Superba Co., Ltd. was subjected to a normal pressure steam set followed by a relaxation heat set of 124 ° C. × 60 seconds to obtain a twisted yarn. The bulkiness after hot water treatment of the obtained twisted yarn was 18.1 cm ³ / g.
Using the obtained twisted yarn, tufting was performed on a needle punched nonwoven fabric under conditions of 5/32 gauge, stitches of 5.6 pieces / inch (22 pieces / 10 cm), and pile height of 25 mm. A cut pile tufted carpet was obtained. Then, dyeing | staining and the backing process were performed according to the conventional method, and the jute base fabric was bonded together on the back surface, and the carpet was obtained. Table 1 shows the characteristics of the obtained twisted yarn and carpet.
The obtained twisted yarn had high bulkiness, and the carpet had an excellent pencil point appearance, a high thickness retention immediately after dewetting, and high recoverability thereafter. Moreover, since the linearity at the time of compression is high and hysteresis loss is small, it can be said that it is excellent in cushioning properties (walking comfort). Furthermore, the light resistance and antifouling property were also excellent.

A carpet was obtained in the same manner as in Example 1 except that stitches using a twisted yarn were changed to 4.2 / inch (16.5 / 10/10 cm). Table 1 shows the characteristics of the obtained twisted yarn and carpet.
The resulting carpet has an excellent pencil point tone appearance, and although the basis weight is smaller than that of Example 1, the thickness retention immediately after dewetting and the recoverability thereafter are the same as in Example 1. It was expensive. Further, the linearity and hysteresis loss at the time of compression were the same level as in Example 1, the cushioning property (walking comfort) was excellent, and the light resistance and antifouling property were also excellent.

In Example 1, two 333 dtex / 144 f polytrimethylene terephthalate 1 heater stretched false twisted yarns and 1 333 dtex / 144 f polyethylene terephthalate 1 heater false twisted yarn (167 dtex / 36 f false twisted yarns were drawn and wound) A twisted yarn was obtained in the same manner as in Example 1 except that air entanglement was performed with an interlace nozzle, and the yarns were combined and both the numbers of the lower twists / upper twists were set to 200 T / m. The obtained twisted yarn was larger in bulk than Example 1.
A carpet was obtained in the same manner as in Example 1 by using this twisted yarn. Table 1 shows the characteristics of the obtained twisted yarn and carpet.
The obtained carpet has an excellent pencil point tone appearance, and although the content of polytrimethylene terephthalate false twisted yarn is smaller than that of Example 1, the thickness retention immediately after dewetting and the subsequent recovery The properties were as high as in Example 1. Further, the linearity and hysteresis loss at the time of compression were the same level as in Example 1, the cushioning property (walking comfort) was excellent, and the light resistance and antifouling property were also excellent.

In Example 3, one 333 dtex / 144 f polytrimethylene terephthalate 1 heater stretched false twisted yarn and 2 333 dtex / 144 f polyethylene terephthalate 1 heater false twisted yarns were aligned and air entangled with an interlace nozzle. A twisted yarn was obtained in the same manner as in Example 3 except that the yarn was used. The obtained twisted yarn was also bulkier than Example 1.
A carpet was obtained in the same manner as in Example 1 using the obtained twisted yarn. Table 1 shows the characteristics of the obtained twisted yarn and carpet.
The obtained carpet has an excellent appearance in pencil point tone, and the content ratio of the polytrimethylene terephthalate false twisted yarn is smaller than that in Example 3, so that the thickness retention immediately after dewetting and the subsequent recovery are reduced. Sex was somewhat small but still high. Further, the linearity and hysteresis loss during compression were still high, the cushioning property (walking comfort) was excellent, and the light resistance and antifouling property were also excellent.

In Example 3, one 167 detex / 36f polytrimethylene terephthalate 1 heater false twisted yarn and 5 167 dtex / 36f polyethylene terephthalate 1 heater false twisted yarns were aligned and air entangled with an interlace nozzle to form a combined yarn A twisted yarn was obtained in the same manner as in Example 3 except that. Since the obtained twisted yarn had a slightly lower polytrimethylene terephthalate false twist content, it was less bulky than Example 1, but had a greater bulkiness than the Comparative Example.
A carpet was obtained in the same manner as in Example 1 by using the obtained twisted yarn. Table 1 shows the characteristics of the obtained twisted yarn and carpet.
The resulting carpet has an excellent pencil point tone appearance, and the content of polytrimethylene terephthalate false twisted yarn is slightly small, so the thickness retention immediately after dewetting and the subsequent recoverability are comparatively small. It was more expensive. Moreover, the linearity at the time of compression was higher than that of the comparative example, the hysteresis loss was small, the cushioning property (walking comfort) was excellent, and the light resistance and antifouling property were also excellent.

Two types of polytrimethylene terephthalate having different intrinsic viscosities were extruded into a side-by-side mold at a ratio of 1: 1 to obtain an undrawn yarn at a spinning temperature of 265 ° C. and a spinning speed of 1500 m / min. Subsequently, the undrawn yarn obtained was hot-rolled at a temperature of 55 ° C., a hot plate temperature of 140 ° C., a drawing speed of 400 m / min, and the draw ratio was set so that the fineness after drawing was 167 dtex, and then twisted, 167 dtex / A 72f side-by-side type composite fiber was obtained.
The intrinsic viscosity of the obtained composite fiber was [η] = 0.90 on the high viscosity side and [η] = 0.70 on the low viscosity side. In addition, the initial tensile resistance, the expansion and contraction elastic modulus of the actual crimp, the expansion and contraction elastic modulus after the hydrothermal treatment, and the heat shrinkage stress at 100 ° C. are 22 cN / dtex, 23% and 90%, respectively. 195% and 98%, 0.21 cN / dtex.
Subsequently, this drawn yarn was false-twisted with an IVF-338 false twisting machine manufactured by Ishikawa Seisakusho under the following false twisting conditions, and two adjacent false twisted yarns were aligned and wound up before winding, 333 dtex / A 1-heater drawn false twisted yarn of 144 f was obtained.

Processing speed: 160 m / min Drawing ratio: 1.020 times False twist heater temperature: 175 ° C (yarn temperature immediately after heater outlet: 172 ° C)
Number of false twists: 2600 T / m
False twist pin: Sapphire φ2.0mm
False twist direction: Z
The strength of the obtained false twisted yarn is 2.4 cN / dtex, the elongation is 40.2%, the initial tensile resistance is 17.4 cN / dtex, the stretch elongation is 142.0%, and the stretch elastic modulus is 86.5%. The number of crimps was 12.7 / cm, and the crimp coefficient was 164 (the fineness of the false twisted yarn was calculated as 167 dtex).
Using the obtained false twisted yarn, a twisted yarn and a carpet were produced in the same manner as in Example 1. Table 1 shows the characteristics of the obtained twisted yarn and carpet.
Although the bulkiness of the obtained twisted yarn was smaller than that of Example 1, it was larger than that of the comparative example. The resulting carpet has an excellent pencil point appearance, high thickness retention immediately after dewetting, high recoverability and linearity during compression, low hysteresis loss and cushioning (walking comfort) ) And light resistance and antifouling properties were also excellent.
[Comparative Examples 1 and 2]

In Example 1, in place of the polytrimethylene terephthalate false twisted yarn, the polytrimethylene terephthalate crimped yarn produced by the BCF method and 66 nylon crimped yarn were used, and the twisted yarn and the carpet were the same as in Example 1. Each was manufactured. Table 1 shows the characteristics of the obtained twisted yarn and carpet.
In both Comparative Examples 1 and 2, the obtained twisted yarn had a low bulkiness. The obtained carpet had a pencil point-like appearance, but the thickness retention immediately after dewetting and the subsequent recoverability were small, and the compression recoverability was poor. Furthermore, since the linearity at the time of compression was low and the hysteresis loss was high, the cushioning properties (walking comfort) were inferior to those of the examples. Moreover, the comparative example 2 was inferior also in light resistance and antifouling property.

Claims (5)

A twisted yarn for carpet, which is a twisted yarn in which two or more fiber yarns are twisted, and the twisted yarn contains a false twisted yarn containing polytrimethylene terephthalate fiber. The carpet twisted yarn according to claim 1, wherein the content of false twisted yarn containing polytrimethylene terephthalate fiber in the twisted yarn is 20 to 80% by weight. 3. The carpet twisted yarn according to claim 1, wherein at least one of the fiber yarns is a false twisted yarn containing polytrimethylene terephthalate fibers, and the other is a false twisted yarn containing polyethylene terephthalate fibers. A carpet, wherein the carpet twisted yarn according to any one of claims 1, 2, and 3 is used as a pile yarn. The carpet according to claim 4, wherein the pile yarn is a cut pile.