JPH0797734A - Conjugate yarn having excellent stiffness, toughness and springiness - Google Patents

Abstract

PURPOSE:To obtain conjugate yarn having excellent stiffness, toughness end springiness by preparing a fiber bundle containing a filament having a specific rigidity coefficient as the core and a short fiber as the sheath and a fiber bundle composed exclusively of short fibers and applying real twist to the fiber bundles to twine the bundles with each other. CONSTITUTION:A uniform conjugate fiber having excellent short fiber coverage and little fluffs can be produced by providing a fiber bundle A containing a polyethylene terephthalate filament F having a rigidity coefficient G satisfying the formula {(n) is number of filaments; I is moment of area of the filament (diameter mu); M is filament modulus (2% elongation stress g/d)} as the core part and a polynosic short fiber SA as the sheath and a fiber bundle B composed exclusively of polynosic short fiber as the sheath, doubling both fiber bundles at a weight ratio (A/B) of 0.4-2.3 and applying real twist to the obtained yarn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite yarn for clothing, which comprises a fiber bundle having a core-sheath structure and a fiber bundle consisting only of short fibers. More specifically, filaments are stably covered with short fibers. The present invention also relates to a composite yarn excellent in tension, waist and elasticity.

[0002]

2. Description of the Related Art Heretofore, there has been known a core yarn in which a filament of a core portion is coated with staple fibers of a sheath portion, so-called staple, as a coating yarn used for a woven or knitted fabric for clothing. This core yarn has an inadequate coating of short fibers in the sheath, and has a drawback that the irritability due to the difference in physical properties between the filament of the core and the short fibers of the sheath is noticeable, which reduces the commercial value. In addition, the filaments and short fibers are poorly entangled with each other, and the filaments and short fibers are separated from each other, so-called sheath can be easily removed. Also, using a ring spinning machine, using two roving yarns and one long fiber yarn, first covering with one short fiber fleece in the form of cross-twisted yarns, and then covering this with another one short fiber. Japanese Patent Laid-Open No. 58-104236 has also proposed a coated yarn which is twist-coated with a fleece. The coated yarn has improved abrasion resistance, but the twisting point is constantly changed due to the tension balance that the long fiber yarn receives from the two short fiber fleeces, and it is difficult to obtain a uniform yarn. It has a drawback that the covering property is not sufficient due to the yarn structure covered with the above, and the stable covering property cannot be obtained due to the change of the intertwisting point. Thus, the ability of the long fiber yarn to be stably covered and to have a texture excellent in tension, elasticity and elasticity has not been obtained by the composite yarns so far.

[0003]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks and stably coats the core fiber, and
It is another object of the present invention to provide a uniform composite yarn which has a texture excellent in tension, waist, and elasticity and has less fluff.

[0004]

The present invention adopts the following means in order to solve the above problems. That is, in the present invention, the filament is formed by actually twisting a fiber bundle A having a core-sheath structure in which short fibers are arranged in a core and a fiber bundle B made of only short fibers and wound around each other. A composite yarn, wherein the composition ratio A / B of the fiber bundle A and the fiber bundle B is in the range of 0.4 to 2.3 in weight ratio, and the rigidity coefficient of the filament existing in the core of the fiber bundle A. G is a composite yarn excellent in tension, waist, and elasticity characterized by satisfying the following expression 2.

[Equation 2] Where n in the equation 2 is the number of filaments, I is the second moment of area of the filament (diameter μm), M is the modulus of the filament (stress g / d at 2% elongation), and G is the rigidity coefficient.

The present invention will be described in detail below with reference to the drawings. The drawings are for illustration purposes only, and the present invention is not limited thereto. In FIG. 1, the fiber bundle A has filaments F at the core and short fibers SA around it, while the fiber bundle B has short fibers S.
Composed of B. Filament F has a rigidity coefficient G of 172
It is necessary to be × 10 ³ or more. Stiffness coefficient G is 1
When it is less than 72 × 10 ³ , a texture excellent in tension, waist and elasticity cannot be obtained. In particular, when short fibers such as fine denier rayon and polyester are used as the short fibers, it is possible to obtain softness, but it is not possible to obtain tension, waist, and elasticity.

As filaments, in addition to synthetic fibers such as polyester, polyamide and polyacryl, semi-synthetic fibers such as promix are generally used for clothing.

The rigidity coefficient G is obtained by adding the second moment of area of the filament × the modulus of the filament for the number of constituent filaments. Moment of inertia of area I of the filament is obtained by 2d ^4/64 When the diameter of the filaments and d ([mu] m). The modulus of filament is the value obtained by reading the stress (g / d) at 2% elongation from the strength-elongation curve with Tensor rapid. The measurement conditions are as follows: measurement yarn length 50 cm, pulling speed 30 cm / min
Is.

Incidentally, even one filament F,
It may be two or more. 1-5 are preferable and 1 is more preferable. The thickness of filament is 10
-30d is preferable. As an example, 15d / 1f, 20d
/ 1f, 30d / 2f, 40d / 2f are mentioned. The filament is 2% by weight to 80% with respect to the fiber bundle A.
%, More preferably 20% to 70% by weight. Further, it is preferable that the filament is present as a single yarn in the fiber bundle A from the viewpoint of imparting elasticity.

On the other hand, as the short fiber SA and the short fiber SB,
There is no particular limitation as long as it can be used in a normal spinning process. The short fibers SA and the short fibers SB are preferably the same, but they may be different. For example, a mixture of short fibers SA and SB, such as a mixture of polynosic fibers and cotton fibers, and short fibers SA and SB.
As an example, it is possible to use cotton on one side and polynosic on the other side.

The weight ratio of the fiber bundle A and the fiber bundle B is A /
B is preferably 0.4 to 2.3. When it is less than 0.4, it is difficult to stably coat the filament with the short fiber, and when it exceeds 2.3, the operability is remarkably lowered, which is not preferable.

Further, the twisting coefficient (inch system) of the real twist applied in the same direction as the twisting direction of the fiber bundles A and B is 1.5 to 2. to obtain a soft and elastic texture. 8 is preferable. When it is less than 1.5, the strength is lowered, which is not preferable, and when it exceeds 2.8, the soft and swelling feeling cannot be obtained due to the binding force of the twist, which is not preferable. Here, the twist coefficient K (inch system) is T = K · Ne.
Expressed as ^1/2 . T is the number of twists (t / inch), and Ne is an English cotton count. A twist coefficient of 3.0 to 8.0 is preferable in order to exert tension, waist and elasticity. The composite yarn of the present invention, having such a structure, has a fluff index of 1 mm or more of 7 when measured with an F-index tester.
When it is 00 or less, the uniformity (U%) is 10% (Ne30) or less, which is excellent.

Next, the manufacturing method will be described. In FIG. 2, two rovings a are attached to the back roller 1 of the ring spinning machine,
b at the same time, where D is the distance from the center of the roving a to the center of the roving b, 3 mm ≦ D ≦ 12 mm
The range D is adopted. When the distance D becomes less than 3 mm,
The yarn strength and abrasion resistance are reduced, and more fluff is generated, and the yarn uniformity is also reduced. Further, if D exceeds 12 mm, the operability is remarkably reduced, which is not preferable. Then, the two rovings a and b are
It is supplied to the front roller 2 after receiving a predetermined draft. At this time, the filament yarn M is supplied to the center of the drafted roving a while being tensioned through the guides 4 and 5. . The fiber bundles A and B that have passed through the front roller 2 are subjected to a predetermined twist number, and the snare wire 7
It is wound up on the bobbin 8 through. 3 is a second roller.

[0013]

【Example】

Examples 1 and 2 Monofilament (20d / 1f) made of polyethylene terephthalate was used as filament yarn M, and roving a was used.
(90 gels / 15 yds), roving b (90 gels / 1
5yds) as polynosic fiber (1d × 38mm)
2 by using the staple of FIG.
0'S (English cotton count) was manufactured. The rigidity coefficient of the filament was 946 × 10 ³ . At this time, the distance between the fiber bundle A and the fiber bundle B is adjusted to be 6 mm, and the roving a (fleece) drafted before the front roller 2 is formed.
The monofilament was superposed on the center of the composite filament to produce a real yarn having a twist coefficient of 3.6 (Example 1) and a real yarn having a real twist of 2.2 (Example 2). The physical properties of these composite yarns were measured and shown in Table 1. Further, using these composite yarns, knitting was performed on a plain cloth using a 28-gauge circular knitting machine, and then the short fiber side was dyed and finished, and the knitted fabric physical properties are shown in Table 1.

[0014]

[Table 1]

As Comparative Example 1, filament yarn 3
Using 0d / 18f multifilament yarn (rigidity rigidity coefficient 118 × 10 ³ ), a composite yarn was produced in the same manner as in Example 1 with a twisting coefficient of 3.6, and a similar knitted fabric was produced, and its physical properties are shown in Table 1. It was shown to. Further, the composite yarn (Comparative Example 2) made with a twisting coefficient of 2.2 in Comparative Example 1 was also made into the same knitted fabric, and its physical properties are shown in Table 1. Further, a core yarn 30'S / 1 having a polyester multifilament yarn (30d / 18f) as a core and a polynosic fiber (1d × 38 mm) as a sheath was manufactured with a twist coefficient of 3.6, and a knitted fabric similar to Example 1 was prepared. The dyed products are evaluated and shown in Table 1.

As can be seen from Table 1, in Example 1, the surface touch of the knitted fabric exhibited a refreshing touch of polynosic fiber, and the filament was stably coated with excellent uniformity, which was extremely high. The texture was excellent in tension, waist, and elasticity. The sample of Example 2 had a softer texture than that of Example 1.

In Comparative Example 1, although the filament had a low rigidity coefficient and thus had a soft texture, it lacked tension, waist and elasticity. Comparative Example 2 had a softer texture than Comparative Example 1. The sample of Conventional Example 1 lacked tension, waist, elasticity and poor coverage.

The single yarn tenacity in Table 1 was measured by a constant speed elongation type tensile tester (Tenso Rapid, manufactured by Zellwegauster). The uniformity (U%) was measured with an Evenestester UT3 (manufactured by Zellweger Worster), and the number of fluffs (1 mm or more) was measured with an F-index tester. The uniformity, tension, waist, elasticity, softness, and covering property of the knitted fabric were evaluated by the following methods. The organoleptic evaluation was evaluated by ⊚ for good, ◯ for good, Δ for normal, and × for bad. In addition, abrasion resistance (pilling grade) is based on the ICI pilling tester (5
The value becomes larger as the pilling resistance increases.

[0019]

INDUSTRIAL APPLICABILITY The composite yarn of the present invention is excellent in tension, elasticity, elasticity and covering property.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of a composite yarn of the present invention.

FIG. 2 is a perspective view of an apparatus for producing a composite yarn according to the present invention.

[Explanation of symbols]

 a, b coarse thread M filament thread A, B fiber bundle 1 back roller 2 front roller 3 second roller 8 bobbin

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[Procedure amendment]

[Submission date] October 6, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

The stiffness coefficient G is obtained by adding the second moment of area of the filament × the modulus of the filament for the number of constituent filaments. Moment of inertia of area I of the filament when the round cross-section is calculated by [pi] d ^4/64 When the diameter of the filaments and d ([mu] m).
Further, the modulus of filament is a value obtained by reading the stress (g / d) at 2% elongation from the strength-elongation curve with Tensor rapid. The measurement conditions are a measurement yarn length of 50 cm and a pulling speed of 30 cm / min.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013]

Examples 1-2 As monofilament (20d / 1f round cross section, diameter 55.7 μm, modulus 2 g / d) made of polyethylene terephthalate as filament yarn M, roving a (90
Gelen / 15yds, roving b (90 gelen / 15yds)
As the s), staple of polynosic fiber (1d × 38 mm) is used, and the composite yarn 30'S is obtained by the method shown in FIG.
(English cotton count) was manufactured. The rigidity coefficient of the filament was 946 × 10 ³ . At this time, the distance between the fiber bundle A and the fiber bundle B was adjusted to be 6 mm, the monofilament was superposed on the center of the roving a (fleece) drafted before the front roller 2, and the twist coefficient was 3. 6
Table 1 shows the physical properties of the composite yarns produced by measuring the physical properties of the composite yarns. Further, using these composite yarns, knitting was performed on a plain cloth using a 28-gauge circular knitting machine, and then the short fiber side was dyed and finished, and the knitted fabric physical properties are shown in Table 1.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

As Comparative Example 1, the filament yarn was 30d / 18f (round cross section, monofilament diameter 1
Using multifilament yarn of 6.1 μm and modulus 2 g / d (rigidity rigidity coefficient of 118 × 10 ³ ), a composite yarn was produced in the same manner as in Example 1 with a twist coefficient of 3.6,
A similar knitted fabric was prepared, and its physical properties are shown in Table 1. In addition, the composite yarn (Comparative Example 2) made with a twist coefficient of 2.2 in Comparative Example 1 also
Table 1 shows the physical properties of the same knitted fabric. Further, a core yarn 30'S / 1 having a polyester multi-filament yarn (30d × 18f) as a core and a polynosic fiber (1d × 38 mm) as a sheath was produced with a twist coefficient of 3.6, and the same knitted fabric as in Example 1 was obtained. Table 1 was evaluated by making and dyeing
It was shown to.

Claims (1)

[Claims] 1. A composite in which a filament includes a fiber bundle A having a core-sheath structure in which short fibers are arranged in a core and a fiber bundle B composed of only short fibers and which are actually twisted so as to be wound around each other. The yarn has a constituent ratio A / B of the fiber bundle A and the fiber bundle B in the range of 0.4 to 2.3 in weight ratio, and the rigidity coefficient G of the filament existing in the core of the fiber bundle A. Satisfying the following formula 1 is a composite yarn excellent in tension, waist and elasticity. [Equation 1] Where n in the equation 1 is the number of filaments, I is the second moment of area of the filament (diameter μm), M is the modulus of the filament (stress g / d at 2% elongation), and G is the rigidity coefficient.