JP2012041647A - Loop yarn and method for producing the same, and woven or knitted fabric thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stretch fabric which has extremely excellent elasticity obtained by dissolving soluble fibers after knitting or weaving, and has a spun-like appearance and a peach skin-like feeling.SOLUTION: A loop yarn D includes a polyurethane-based elastic fiber A, a soluble fiber B and another filament fiber C, and has a core-sheath structure in which the polyurethane-based elastic fiber A is arranged in the core part, and the other filament fiber C is arranged in the sheath part. The loop yarn D is formed by intermittently interlacing the polyurethane-based elastic fiber A with the other filament fiber C in the longitudinal direction of the yarn while interposing the soluble fiber B therebetween, and has loops on the yarn surface.

Description

  The present invention relates to a loop yarn capable of providing a stretch fabric having excellent extensibility and an elegant appearance by dissolving soluble fibers after weaving and knitting when subjected to high-order processing and used for clothes and the like, and a method for producing the loop yarn And its woven or knitted fabric.

  Conventionally, in order to obtain a stretch material, polyurethane elastic fiber is used as the core yarn, and the coated elastic yarn with single or double coating of polyamide fiber or polyethylene terephthalate fiber as sheath yarn is stockings, socks, inner etc. It has been used for general clothing (see Patent Document 1). However, there is much room for improvement in the demand for further stretching.

  There is also a proposal for a sewing thread in which a soluble fiber is coated on an elastic thread for sewing a stretch fabric (see Patent Document 2). This reduces the frictional resistance generated between the thread and the sewing needle during sewing with the soluble fiber, and has the effect of simplifying the handling, and dissolves the soluble fiber after sewing, leaving only the elastic thread, The sewing part is provided with elasticity. However, in the fabric, only the elastic yarn remains, and there remains a problem in durability.

  In addition, a coated elastic yarn in which a soluble fiber is coated with a soluble fiber and a coarse yarn is coated in a spinning process has been proposed (see Patent Document 3). This proposal is intended to limit the extensibility of the coated elastic yarn, and the extensibility of the product is not different from the use of ordinary fine spinning and twisted yarn, and high extensibility can be obtained. could not.

  Therefore, a covered elastic yarn is proposed in which the elastic yarn and the soluble fiber are aligned in the covering step and then covered with another fiber (see Patent Document 4). In the proposal, the meaning of the soluble fiber is a role as a so-called spacer for increasing the sheath spiral diameter of the sheath yarn, and it is high by dissolving the soluble fiber after weaving and knitting using a sufficiently thick soluble fiber. An extensible product can be obtained. However, since the coated elastic yarn by this method is a covering yarn, it does not have loops and fluff on the yarn surface, and the woven or knitted fabric using this yarn has a very flat appearance, and has a feel of eyelash and peach skin tone. Can't get. In addition, the yarn path for covering is complicated, and it takes time and effort for threading, and the production speed is low, so there is room for improvement.

  On the other hand, a composite elastic yarn having an elastic yarn as a core yarn and having two types of filaments mixed in different feeds and having a span-like loop fluff has been proposed (see Patent Document 5). This method promotes blending with elastic yarns, and can form a large number of fine loop fluffs to create a loop yarn with a fine texture of span tone. It becomes a low stretch thing to reduce the nature.

JP 2000-178845 A JP-A-01-260030 JP 05-044130 A JP 2010-116641 A JP 2001-303375 A

  The present invention provides a loop yarn capable of providing a stretch fabric having extremely stretchability, a spun-like appearance, and a peach skin-like texture, a method for producing the same, and a woven or knitted fabric using the same. Objective.

The loop yarn of the present invention has one of the following configurations in order to solve the above problems. That is,
(1) A loop yarn including a polyurethane-based elastic fiber, a soluble fiber, and other filament fibers, wherein the polyurethane-based elastic fiber is disposed in a core portion and the other filament fibers are disposed in a sheath portion. The polyurethane elastic fiber and the other filament fiber are intermittently entangled in the longitudinal direction of the yarn with a soluble fiber interposed therebetween, and the yarn surface has a loop. A characteristic loop yarn.
(2) The loop yarn according to (1), wherein the soluble fiber is a polyvinyl alcohol fiber.
(3) The loop yarn according to (1) or (2), wherein a yarn length ratio between the polyurethane elastic fiber and the other filament fiber satisfies the following formula.
(Thread length of other filament fiber) / (Thread length of polyurethane elastic fiber) ≧ 2.8
(4) The number of loops protruding from the yarn surface by 0.35 mm or more is 120 pieces / m or more, and the number of loops protruding from 2 mm or more is 10 pieces / m or less. The loop yarn according to any one of the above.
(5) A method for producing a loop yarn, characterized in that polyurethane-based elastic fibers drawn in advance by 2 to 4.5 times are aligned with soluble fibers and other filament fibers, and further entangled with a nozzle.
(6) The polyurethane-based elastic fiber and the soluble fiber are aligned, and the other filament fibers are aligned and arranged around them, and entangled by the nozzle (5) ) Loop yarn manufacturing method.
(7) The method for producing a loop yarn according to (5) or (6), wherein entanglement is performed using a fluid turbulent nozzle.
(8) A woven or knitted fabric using the loop yarn according to any one of (1) to (4) or the loop yarn produced by the method according to any one of (5) to (7).

The loop yarn of the present invention has a core-sheath structure in which polyurethane-based elastic fibers are arranged in the core and other filament fibers are arranged in the sheath, and the polyurethane-based elastic fibers and other filament fibers are interposed between them. It is entangled intermittently in the longitudinal direction of the yarn while interposing soluble fibers to form a loop on the surface of the yarn. By having many loops on the surface of the loop yarn, when a woven or knitted fabric is formed, it can have a spun-like appearance and a peach skin-like texture. In the loop yarn stage, polyurethane elastic fibers, soluble fibers and other filament fibers are entangled with each other. If soluble fibers are dissolved after weaving or the like, polyurethane elastic fibers and other filament fibers An air gap is formed between the elastic fibers and the soluble fibers, and the entanglement between the soluble fibers and other filament fibers can be released. Therefore, although it has a spun-like appearance as a loop yarn and a peach skin-like texture, the elongation resulting from the polyurethane-based elastic fiber can be sufficiently developed. Furthermore, a weight reduction effect of the fabric can be expected, and the degree of freedom of expansion and contraction of the polyurethane elastic fiber can be increased.

  Then, by using the loop yarn of the present invention and dissolving the soluble fiber after weaving and knitting, it is possible to provide a stretch fabric having extremely excellent stretchability.

It is a schematic diagram which shows an example of the loop yarn of this invention. It is a schematic diagram which shows an example of the manufacturing process of the loop yarn of this invention. It is a schematic diagram which shows an example of the manufacturing process of the loop yarn of this invention. It is a schematic diagram which shows the process of measuring the number of loops. It is a figure which shows an example of loop number distribution.

  Hereinafter, the loop yarn of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic side view showing an example of a loop yarn of the present invention. The loop yarn (d) has a core-sheath structure in which a polyurethane elastic fiber (b) is arranged in the core part and other filament fibers (c) are arranged in the sheath part. ) And other filament fibers (c) are intermittently entangled in the longitudinal direction of the yarn with a soluble fiber (b) interposed therebetween to form a loop on the yarn surface.

  The polyurethane elastic fiber used for the core yarn is preferably one obtained by spinning a polyurethane polymer obtained by reacting an isocyanate mainly composed of a polymer diol and an organic diisocyanate with a polyfunctional active hydrogen compound.

  Examples of the polymer diol include at least one of polyether glycols such as polytetramethylene glycol, polyethylene glycol, and propylene ether glycol, and glycols such as ethylene glycol, 1,6-hexanediol, 1,4-butanediol, and neopentyl glycol. Polyester glycols, polycaprolactone glycol, polyhexamethylene dicarbonate glycol obtained by reacting at least one dicarboxylic acid such as adipic acid, suberic acid, azelaic acid, sebacic acid, β-methyladipic acid, and isophthalic acid Examples thereof include one or a mixture or copolymer of two or more polymer diols.

  Examples of the organic diisocyanate include 4,4′-diphenylmethane diisocyanate, 1,5-naphthalene diisocyanate, 1,4-phenylene diisocyanate, 2,4-tolylene diisocyanate, hexamethylene diisocyanate, 1,4-cyclohexane diisocyanate, 4, Examples thereof include one or a mixture of two or more organic diisocyanates such as 4'-dicyclohexylmethane diisocyanate and isophorone diisocyanate. Further, a small amount of triisocyanate may be used in combination.

  Examples of the polyfunctional active hydrogen compound used in the present invention include ethylenediamine, 1,2-propylenediamine, hexamethylenediamine, xylylenediamine, 4,4′-diphenylmethanediamine, hydrazine, 1,4-diaminopiperazine, ethylene glycol, 1 1, 4-butanediol, 1,6-hexanediol, water and the like, or a mixture of two or more of these.

  If desired, these compounds may be used in combination with a small amount of a terminator such as monoamine or monoalcohol. In addition, antioxidants such as 2,6-ditetrabutylparacresol and phosphite, light or ultraviolet absorbers such as hydroxybenzophenone or hydroxybenzothiazole, 1,1-dialkyl-substituted semicarbazide, dithiocarbamate, etc. Gas yellowing and deterioration preventing agents, and white pigments such as titanium oxide and zinc oxide may be used as appropriate.

  The fineness of the polyurethane-based elastic fiber used in the present invention is preferably in the range of 11 to 154 dtex, and more preferably in the range of 22 to 44 dtex. Further, the breaking elongation is preferably 300% or more. The cross-sectional shape of the polyurethane elastic fiber may be circular or flat.

  Next, the soluble fiber may be any fiber as long as it can be dissolved and removed with water, an aqueous solution, steam, an organic solvent, or the like. For example, a polyvinyl alcohol fiber that is easily dissolved in warm water is preferable. In addition, an alkylene glycol copolymer polyester fiber may be used as one that dissolves in warm water. Other soluble fibers include elastic 5-sodium sulfoisophthalic acid copolymerized polyester fibers that are hydrolyzed by an aqueous alkali solution.

  Next, other filament fibers used as the sheath in the loop yarn of the present invention include natural fibers such as silk, regenerated fibers such as rayon and cupra, semi-synthetic fibers such as acetate, nylon, polyester, acrylic, polypropylene, and the like. The filament fiber of a synthetic fiber can be illustrated, and any filament fiber may be used as long as it is not the above-mentioned polyurethane elastic fiber and soluble fiber.

  The loop yarn of the present invention configured as described above, for example, after weaving, dissolves soluble fibers to generate voids between the core and the sheath, and further entangles the polyurethane elastic fibers with other filament fibers. By greatly reducing the condition, the polyurethane elastic fiber is released from the restraining force from the sheath yarn, and can expand and contract more freely. Furthermore, a weight reduction effect of the fabric can be expected, and the degree of freedom of expansion and contraction of the polyurethane elastic fiber can be increased.

  By configuring the loop yarn of the present invention as described above, the yarn length ratio between the polyurethane elastic fiber in the core and the other filament fibers in the sheath can satisfy the following formula. .

(Thread length of other filament fiber) / (Thread length of polyurethane elastic fiber) ≧ 2.8
If the above relational expression is satisfied, dissolving the soluble fiber not only greatly reduces the degree of entanglement and expresses stretchability, but also the polyurethane-based elastic fiber is equivalent to the yarn length of the other filament fiber. Therefore, it is possible to exhibit even higher stretchability as a loop yarn. The upper limit of the yarn length ratio is not particularly limited, but is actually about 5.5.

  The loop yarn of the present invention has 120 loops / m or more protruding from the surface of the yarn by 0.35 mm or more, so that a spun-like appearance and a peach skin tone texture can be more easily reproduced when a woven or knitted fabric is formed. Can do. On the other hand, if there are more than 10 mm / m projecting loops, the loops may be entangled with each other when the loop yarn is released from the yarn package, and may be released due to abnormal tension or may cause yarn breakage ( Zipper phenomenon). Therefore, it is preferable that the number of loops protruding 0.35 mm or more from the yarn surface is 120 / m or more and the number of loops protruding 2 mm or more is 10 / m or less. Of course, the loop protruding 2 mm or more may not exist at all.

  Next, the manufacturing method of the loop yarn of this invention is demonstrated using drawing.

  In the loop yarn manufacturing method of the present invention, a stretched polyurethane elastic fiber is aligned with a soluble fiber and other filament fibers and entangled with a nozzle to form a loop.

  Specifically, for example, as shown in FIG. 2, polyurethane-based elastic fibers and soluble fibers previously stretched by 2 to 4.5 times are aligned, and other filament fibers are aligned around these. Arranged as sheath yarn and entangled with a nozzle. In FIG. 2, the polyurethane-based elastic fiber 1 is pre-drafted (elongated) between the feed rollers 4 and 5, and then aligned with the soluble fiber 2 by the feed roller 5. On the other hand, the other filament fibers 3 are fed out by the feed roller 6 and entangled with the polyurethane elastic fibers 1 and the soluble fibers 2 at the nozzle 7 to form a loop.

  Further, as shown in FIG. 3, the other filament fibers 3 may be aligned with the polyurethane elastic fibers 1 and the soluble fibers 2 by the feed roller 5 without the feed roller 6 interposed therebetween.

  The nozzle 7 is preferably a fluid turbulent nozzle represented by a Taslan nozzle, but may be an interlace nozzle. The yarn entangled by the nozzle 7 is wound around the package 10 by the winder 9 via the delivery roller 8.

  Here, as described above, in order to set the loop protruding from the yarn surface by 0.35 mm or more to 120 pieces / m or more and the loop protruding from 2 mm or more to 10 pieces / m or less, the polyurethane elastic fiber and other filament fibers are used. It is preferable that the number of the soluble fiber filaments interposed between the two is 5 or more, and more preferably 10 or more. By increasing the number of filaments of the soluble fiber, the entanglement at the entanglement is improved, and it becomes easy to increase the number of loops protruding 0.35 mm or more and to decrease the number of loops protruding 2 mm or more. The pre-draft of the polyurethane-based elastic fiber is also preferably set to 4.5 or less, and if it is greater than 4.5, yarn slack is less likely to occur in the entanglement nozzle, resulting in a loop protruding more than 0.35 mm. In many cases, it is difficult to reduce the number of loops protruding by 2 mm or more.

  The loop yarn of the present invention obtained in this way is used for woven and knitted fabrics, and the woven and knitted fabrics are particularly excellent in stretchability, and are suitable as stretch materials such as legwear such as stockings and tights, innerwear, and sports clothing. Can be used.

  Hereinafter, the present invention will be described more specifically with reference to examples. However, the present invention is not limited to these examples.

[Yarn length ratio]
Under a load of 1.8 × 10 ⁻³ cN / dtex, make 10 sets of casserole with a hand-held measuring instrument with a circumference of 1 m and apply a load of 1.8 × 10 ⁻³ cN / dtex. In this state, it is treated with hot water at 90 ° C. for 20 minutes (this dissolves the soluble fiber when soluble fiber is present). Next, the load was removed, and air drying was performed for one day and night.

The obtained five samples were untwisted and separated into polyurethane-based elastic fibers and other filament fibers, and the yarn length of each sample under a load of 1.8 × 10 ⁻³ cN / dtex was measured. The average value of the casserole was obtained. Then, the yarn length ratio is calculated by the following formula.
Yarn length ratio = (yarn length of other filament fiber) / (yarn length of polyurethane elastic fiber).

[Elongation(%)]
Under a load of 1.8 × 10 ⁻³ cN / dtex, make 10 sets of casserole with a hand-held measuring instrument with a circumference of 1 m and apply a load of 1.8 × 10 ⁻³ cN / dtex. In this state, it is treated with hot water at 90 ° C. for 20 minutes (this dissolves the soluble fiber when soluble fiber is present). Next, the load is removed and air-dried for one day and night. About the obtained five samples, using a constant-speed extension type tensile tester with a self-recording device, the sample was attached at an interval of 10 cm with an initial load of 1.8 × 10 ⁻³ cN / dtex. Was 10 cm / min, stretched until it broke, and the grip interval L1 (cm) when it broke was measured, the elongation rate until fracture was calculated by the following formula, and the average of the five values was taken as the elongation rate.
Elongation rate (%) = (L1−10) / 10 × 100.

[Number of loops (pieces / m)]
In the process shown in FIG. 4, the number of loops protruding 0.5 mm or more and 2 mm or more from the yarn surface of the air processed yarn was measured using a photoelectric fluff measuring machine (TORAYFRAY COUNTER), the yarn speed was 60 m / min, and the running yarn tension was 0. It measured on the conditions of 0883cN / dtex. The thread surface referred to here is a peak value of the number of loops when the number of loops is measured while shifting the photoelectric tube sensor by 0.01 mm in the above process and the loop distribution graph shown in FIG. 5 is created. The position of the photoelectric tube sensor was defined as the yarn surface.

[Evaluation of inner stretch, support, peach skin tone, and fabric tension]
A sensory evaluation was conducted on five stretched female monitors in their 20s to 50s about the stretchability, support, peach skin tone, and fabric tension of the finished inner. The average score of the evaluation score results for stretchability, support power, peach skin tone, and fabric tension is shown as each evaluation score.
<Stretchability evaluation point>
3: Excellent stretch properties 2: Slightly lacking stretch properties 1: Lack of stretch properties <Evaluation point for support power>
3: Excellent support power 2: Slight lack of support power 1: Fabric shift occurs <Peach skin texture>
3: The fabric surface texture is soft.

  2: The surface of the fabric is slightly soft.

1: The fabric surface is flat and does not feel soft.
<Evaluation point for fabric tension>
3: There is no feeling of fabric tension at all times 2: A feeling of fabric tension is felt only during exercise 1: A feeling of fabric tension is always felt.

[Example 1]
In the air processing step shown in FIG. 2, 22 dtex polyurethane elastic fiber, 31 dtex 12 filament polyvinyl alcohol fiber (soluble fiber), and 10 dtex 5 filament polyamide filament as the other filament fiber, the following conditions And air processed to obtain a loop yarn.

[Air processing conditions]
Processing speed (delivery roller 8 surface speed): 350 m / min
Predraft of polyurethane elastic fiber: 3.0
Nozzle: Heslaline Taslan nozzle Hema-Jet T-311
Entangled feed of polyurethane elastic fiber and soluble fiber (relaxation rate between feed roller 5 and deliberry roller 8): + 2%
Entanglement feed of other filament fibers (relaxation rate between the feed roller 6 and the delivery roller 8): + 10%
Entanglement pressure: 0.20 MPa
Table 1 shows the yarn length ratio and elongation rate of the obtained loop yarn after dissolving the soluble fiber together with the number of loops.

  The obtained loop yarn was knitted with a Santony milling garment length circular knitting machine Santony SM88 (8-port yarn feed, 13 inches (≈33 cm), 28 gauge) as a ladies inner, and soluble fiber in a bath at 80 ° C. After dissolving, dyeing with a normal acid dye was performed with a paddle dyeing machine.

  The inner knitted fabric obtained was subjected to sensory evaluation on the stretchability, support, peach skin tone, and fabric tension. The results are shown in Table 2.

[Example 2]
As in Example 1, a 33 dtex polyurethane elastic fiber, a 31 dtex 12 filament polyvinyl alcohol fiber, and a 56 dtex 40 filament polyamide wooly processed yarn as the other filament fiber as shown in FIG. Air processing was carried out under the conditions described above to obtain a loop yarn.

[Air processing conditions]
Processing speed (delivery roller 8 surface speed): 350 m / min
Predraft of polyurethane elastic fiber: 3.0
Nozzle: Entangled nozzle made by Hebaline Slide-Jet P-312
Confounding feed of polyurethane elastic fiber and soluble fiber: + 3%
Interlaced feed of other filament fibers: + 18%
Entanglement pressure: 0.32 MPa
About the obtained loop yarn, the yarn length ratio and elongation rate of the loop yarn after dissolving the soluble fiber were determined together with the number of loops. The results are shown in Table 1.

  Further, the obtained loop yarn was knitted with a Santony company's milling garment length circular knitting machine Santony SM88 (8-neck yarn, 13 inches, 28 gauge) as a ladies inner, and after dissolving solubility in a bath at 80 ° C, It dye | stained with the normal acid dye with the paddle dyeing machine.

  The inner knitted fabric obtained was subjected to sensory evaluation on the stretchability, support, peach skin tone, and fabric tension. The results are shown in Table 2.

[Example 3]
A loop yarn was obtained by using the same yarn as in Example 2 and performing air processing under the following conditions on the air processing step shown in FIG.

[Air processing conditions]
Processing speed (delivery roller 8 surface speed): 350 m / min
Predraft of polyurethane-based elastic fiber: 4.2
Nozzle: Hebaline Taslan nozzle Hema-Jet T-311
Confounding feed of polyurethane elastic fiber and soluble fiber: + 3%
Entanglement feed of other filament fibers: + 8%
Entanglement pressure: 0.32 MPa
About the obtained loop yarn, the yarn length ratio and elongation rate of the loop yarn after dissolving the soluble fiber were determined together with the number of loops. The results are shown in Table 1.

  The obtained loop yarn was knitted with a Santony milling garment length circular knitting machine Santony SM88 (8-neck yarn, 13 inches, 28 gauge) as a ladies inner, and soluble fibers were dissolved in a bath at 80 ° C. Then, dyeing with a normal acid dye was performed with a paddle dyeing machine.

  The inner knitted fabric obtained was subjected to sensory evaluation on the stretchability, support, peach skin tone, and fabric tension. The results are shown in Table 2.

[Example 4]
A loop yarn was obtained by using the same thread as in Example 2 and performing air processing under the following conditions on the air processing step shown in FIG.

[Air processing conditions]
Processing speed (delivery roller 8 surface speed): 350 m / min Pre-draft of polyurethane elastic fiber: 4.2
Nozzle: Entangled nozzle made by Hebaline Slide-Jet P-312
Confounding feed of polyurethane elastic fiber and soluble fiber: + 3%
Interlaced feed of other filament fibers: + 3%
Entanglement pressure: 0.20 MPa
About the obtained loop yarn, the yarn length ratio and elongation rate of the loop yarn after dissolving the soluble fiber were determined together with the number of loops. The results are shown in Table 1.

  The obtained loop yarn was knitted with a Santony milling garment length circular knitting machine Santony SM88 (8-neck yarn, 13 inches, 28 gauge) as a ladies inner, and soluble fibers were dissolved in a bath at 80 ° C. Then, dyeing with a normal acid dye was performed with a paddle dyeing machine.

The inner knitted fabric obtained was subjected to sensory evaluation on the stretchability, support, peach skin tone, and fabric tension. The results are shown in Table 2.
[Example 5]
A loop yarn was obtained by using the same yarn as in Example 2 and performing air processing under the following conditions on the air processing step shown in FIG.

[Air processing conditions]
Processing speed (delivery roller 8 surface speed): 350 m / min
Predraft of polyurethane-based elastic fiber: 2.7
Nozzle: Hebaline Taslan nozzle Hema-Jet T-311
Confounding feed of polyurethane elastic fiber and soluble fiber: + 3%
Entanglement feed of other filament fibers: + 8%
Entanglement pressure: 0.32 MPa
About the obtained loop yarn, the yarn length ratio and elongation rate of the loop yarn after dissolving the soluble fiber were determined together with the number of loops. The results are shown in Table 1.

  The obtained loop yarn was knitted with a Santony milling garment length circular knitting machine Santony SM88 (8-neck yarn, 13 inches, 28 gauge) as a ladies inner, and soluble fibers were dissolved in a bath at 80 ° C. Then, dyeing with a normal acid dye was performed with a paddle dyeing machine.

The inner knitted fabric obtained was subjected to sensory evaluation on the stretchability, support, peach skin tone, and fabric tension. The results are shown in Table 2.
[Example 6]
A loop yarn was obtained by using the same yarn as in Example 2 and performing air processing under the following conditions on the air processing step shown in FIG.

[Air processing conditions]
Processing speed (delivery roller 8 surface speed): 350 m / min
Predraft of polyurethane-based elastic fiber: 4.6
Nozzle: Hebaline Taslan nozzle Hema-Jet T-311
Confounding feed of polyurethane elastic fiber and soluble fiber: + 3%
Entanglement feed of other filament fibers: + 8%
Entanglement pressure: 0.32 MPa
About the obtained loop yarn, the yarn length ratio and elongation rate of the loop yarn after dissolving the soluble fiber were determined together with the number of loops. The results are shown in Table 1.

  The obtained loop yarn was knitted with a Santony milling garment length circular knitting machine Santony SM88 (8-neck yarn, 13 inches, 28 gauge) as a ladies inner, and soluble fibers were dissolved in a bath at 80 ° C. Then, dyeing with a normal acid dye was performed with a paddle dyeing machine.

  The inner knitted fabric obtained was subjected to sensory evaluation on the stretchability, support, peach skin tone, and fabric tension. The results are shown in Table 2.

[Comparative Example 1]
Except not using a soluble fiber, the yarn was used under the same conditions as in Example 1 and processed with air to obtain a loop yarn.

  The yarn length ratio and elongation rate of the obtained loop yarn were determined. The results are shown in Table 1.

  In addition, this loop yarn was knitted on a Santony milling garment length circular knitting machine Santony SM88 (8-neck yarn, 13 inches, 28 gauge) as a ladies inner, and dyed with a normal acid dye with a paddle dyeing machine. .

  The inner knitted fabric obtained was subjected to sensory evaluation on the stretchability, support, peach skin tone, and fabric tension. The results are shown in Table 2.

[Comparative Example 2]
In the air processing step shown in FIG. 2 using the same yarn as in Example 1, air processing was performed under the following conditions, but the yarn was not entangled and the yarn was broken and a loop yarn could not be obtained.

[Air processing conditions]
Processing speed (delivery roller 8 surface speed): 350 m / min
Predraft of polyurethane elastic fiber: 4.8
Nozzle: Entangled nozzle made by Hebaline Slide-Jet P-312
Confounding feed of polyurethane elastic fiber and soluble fiber: + 3%
Interlaced feed of other filament fibers: + 18%
Entanglement pressure: 0.32 MPa
[Comparative Example 3]
In the air processing step shown in FIG. 3, without using soluble fibers, two polyamide wooly processed yarns of 56 dtex 40 filaments as 33 dtex polyurethane elastic fibers and other filament fibers are air processed under the following conditions: A loop yarn was obtained.

[Air processing conditions]
Processing speed (delivery roller 8 surface speed): 350 m / min
Predraft of polyurethane-based elastic fiber: 4.2
Nozzle: Entangled nozzle made by Hebaline Slide-Jet P-312
Entanglement feed of polyurethane elastic fiber: + 3%
Interlaced feed of other filament fibers: + 3%
Entanglement pressure: 0.20 MPa
About the obtained loop yarn, the yarn length ratio and elongation rate of the loop yarn after dissolving the soluble fiber were determined together with the number of loops. The results are shown in Table 1.

  The obtained loop yarn was knitted with a Santony milling garment length circular knitting machine Santony SM88 (8-neck yarn, 13 inches, 28 gauge) as a ladies inner, and soluble fibers were dissolved in a bath at 80 ° C. Then, dyeing with a normal acid dye was performed with a paddle dyeing machine.

  The inner knitted fabric obtained was subjected to sensory evaluation on the stretchability, support, peach skin tone, and fabric tension. The results are shown in Table 2.

  The loop yarn of the present invention can provide a stretch fabric having extremely excellent stretchability by dissolving soluble fibers after weaving and knitting, for example, and having a spun-like appearance and a peach skin-like texture. It can be particularly suitably used for innerwear, outerwear, sportswear, and the like that require properties, wearing feeling, texture, and appearance quality.

(A): polyurethane-based elastic fiber (b): soluble fiber (c): other filament fiber (d): loop yarn 1: polyurethane elastic fiber 2: soluble fiber 3: other filament fiber 4: feed roller 5: feed Roller 6: Feed roller 7: Nozzle 8: Delivery roller 9: Winder 10: Package 11 Air processed yarn 12 Washer tensor 13 Guide 14 Photoelectric tube sensor 15 Guide 16 Feed roller 17 Photoelectric fuzz measuring machine 18 Suction gun

Claims (8)

A loop yarn including a polyurethane-based elastic fiber, a soluble fiber, and other filament fibers, and having a core-sheath structure in which the polyurethane-based elastic fiber is disposed in a core portion and the other filament fibers are disposed in a sheath portion. The polyurethane elastic fiber and the other filament fiber are entangled intermittently in the longitudinal direction of the yarn with a soluble fiber interposed therebetween, and has a loop on the yarn surface. Loop yarn. The loop yarn according to claim 1, wherein the soluble fiber is a polyvinyl alcohol fiber. The loop yarn according to claim 1 or 2, wherein a yarn length ratio between the polyurethane elastic fiber and the other filament fiber satisfies the following formula.
(Thread length of other filament fiber) / (Thread length of polyurethane elastic fiber) ≧ 2.8 The loop yarn according to any one of claims 1 to 3, wherein the loop yarn having a length of 0.35 mm or more protruding from the yarn surface is 120 pieces / m or more and a loop of 2 mm or more is 10 pieces / m or less. . A process for producing a loop yarn, characterized in that polyurethane-based elastic fibers previously stretched by 2 to 4.5 times are aligned with soluble fibers and other filament fibers, and further entangled with a nozzle. 6. The loop according to claim 5, wherein after the polyurethane-based elastic fiber and the soluble fiber are aligned, the other filament fibers are aligned around the periphery and entangled by the nozzle. Yarn manufacturing method. The method for producing a loop yarn according to claim 5 or 6, wherein the entanglement is performed using a fluid turbulent nozzle. A woven or knitted fabric using the loop yarn according to any one of claims 1 to 4 or the loop yarn produced by the method according to any one of claims 5 to 7.

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