JP3286447B2 - Mixed yarn - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mixed yarn comprising cellulose fibers and polyester filaments and a woven or knitted fabric using such a mixed yarn.

[0002]

2. Description of the Related Art Twisted / blended yarns of synthetic fibers typified by polyester fibers and natural fibers or regenerated cellulose fibers are knitted and woven and widely used for clothing and the like. However, in the case of such a composite, since the characteristics of natural fibers / regenerated cellulose fibers and synthetic fibers are considerably different,
It is very difficult to make a uniform composite.

[0003] In particular, in the case of a blended yarn of a regular drawn polyester filament and a regenerated cellulose filament, uniform blending is extremely difficult because the former has a higher heat shrinkage stress and a higher initial modulus. In addition, there is a problem that the feeling of swelling is insufficient, both fibers are separated, and the soft feeling peculiar to regenerated cellulose fibers is impaired. Proposals for solving such problems are already known.

For example, Japanese Utility Model Publication No. Sho 62-23818 discloses a mixed yarn of a polyester filament and a recycled fiber such as rayon, cupra, or acetate.
A proposal focusing on the yarn density, birefringence, and boiling water shrinkage of a polyester filament is disclosed. However, even with such a proposal, it is difficult to obtain a homogeneous mixed fiber, and a mixed fiber excellent in swelling feeling and excellent in flexibility has not been obtained.

[0005]

That is, the present invention relates to a blend of a polyester filament and a regenerated cellulose fiber which is uniformly mixed, has a swelling feeling, and does not lose the flexibility inherent in the regenerated cellulose fiber. The purpose is to provide a fine yarn.

[0006]

Means for Solving the Problems The inventors of the present invention have studied from attempts to blend polyester long fibers and regenerated cellulose fibers by high-speed air flow in order to achieve the uniform blending aimed at by the present invention. As a result of intensive studies, it is very important to disperse regenerated cellulose filaments at the level of single yarns for uniform blending. The cross-sectional shape at the level is closely related and plays an important role, and the cross-sectional shape of the irregular cross section is better than that of the round cross section. The inventors have found that the uniformity of the obtained mixed fiber is still insufficient in the mold cross section, and that there is a cross-sectional shape that can achieve the object of the present invention, thereby completing the present invention. 1. The invention claimed in the present invention is as follows.

The viscose rayon filaments in which the cross-sections of the single yarns are independently irregularly varied in the yarn length direction, the initial modulus is 60 to 100 g / d, and the mechanical loss tangent at a measurement frequency of 110 Hz. (Tan δ) The temperature at which _max shows the maximum (Tmax) and the maximum value of tan δ (t
anδ) A mixed fiber comprising polyester filaments having a _max satisfying any one of the following formulas (1) and (2).

105 ° C. <Tmax ≦ 115 ° C.
135 <(tan δ) _max ≦ 0.190 Expression 1 110 ° C. <Tmax ≦ 115 ° C. and 0.110 ≦ (t
an δ) _max ≦ 0.135 Equation 2 A woven or knitted fabric comprising at least a part of the mixed fiber according to the above item 1. 3. 2. A mixed yarn obtained by twisting the mixed yarn according to the above 1 in 100 times / m or more.

Hereinafter, the present invention will be described in more detail. The cellulose fibers used in the present invention are viscose rayon filaments. However, the cross-sectional shape of the single yarn is a viscose rayon long fiber having a shape significantly different from the conventionally well-known chrysanthemum-shaped cross-sectional shape, and the cross-sectional shape of the single yarn is used in the present invention. It is limited to viscose rayon filaments that are independently irregularly varied in the yarn length direction. Such rayon fiber is disclosed in JP-A-2-29.
It is disclosed in Japanese Patent Publication No. 3405.

In the present invention, the single yarns constituting the viscose rayon filaments are non-twisted yarns in which the cross-section at each position of the yarn is different for each single yarn because the cross-sectional shape varies independently. It is. This is because, since the cross-sectional shape is varied within a short distance, single yarns of various shapes are naturally mixed at any yarn position. Due to such a cross-sectional shape, when entangled and mixed with polyester filaments by turbulent air, air is randomly blown to each single yarn cross section, and the single yarns are dispersed very uniformly, and as a result, uniform The present inventors have found that fibers can be mixed.

The “mutation of the cross-sectional shape” in the present invention means
Index A, which is an index characterizing three types of cross-sectional shapes measured by the method described below. B. It means that one or more indices of C are different. Further, this “different” means that the index A. B means 10% or more difference, and C means 1 or more difference.

Index A: A scale representing the degree of roundness according to Equation 1.

[0013]

(Equation 1)

Here, L: maximum length between any two points in the same section of the single yarn and S: area of the section. Index B: Scale representing the degree of unevenness according to Equation 2.

[0015]

(Equation 2)

Here, M: perimeter of the cross section, S: area of the cross section. Index C: a scale representing the degree of unevenness, and a scale represented by the number of straight lines constituting a shape when the shape is represented by a straight line as illustrated in FIG. Note that S (cross-sectional area) and L in the above indexes A and B
(Maximum length), M (perimeter), using an enlarged photo of the cross section of a single yarn, image processing it, convert the cross section as a set of points and display it, and display each point on the coordinate plane With this, the shape of the cross section can be quantitatively measured. Such image processing can be performed using, for example, a model E-100 manufactured by Eiko Sangyo Co., Ltd.

The value of A measured at an arbitrary point Pn of one single yarn is A (Pn), and the value of A measured at a point Pn '100 mm away from Pn is A (Pn'). When the ratio

[0018]

(Equation 3)

Is calculated, and this value is used as the rate of change of the index A. If this value is 90 or less or 110 or more, it is determined that it has changed. If the value exceeds 90 and is less than 110, it is determined that there is no change. Similarly, the index B is determined based on the same criteria as described above. Next, the index C is similarly observed, and it is determined that the index has changed if the absolute value of the difference between the numbers of the constituent straight lines differs by one or more. .

Next, the three indexes A. If it is determined that B and C have not changed, then it is determined that the cross-sectional shape has not changed, and the others are determined to have changed the cross-sectional shape. The fact that each of the single yarns has a substantially irregularly varied cross-sectional shape is shown in FIGS. 2 to 4 by enlarging the cross-sectional shape of a part of the yarn and tracing it. FIG. 2 is a diagram obtained by enlarging and tracing the shape of a single thread slice of viscose rayon fiber used in the present invention. FIG. 3 is an enlarged and traced cross-sectional shape of a single thread of conventional viscose rayon fiber.

FIG. 4 is a cross-sectional view of the single yarn of the viscose rayon fiber used in the present invention taken at intervals of 100 mm in the yarn length direction, showing the variation in the yarn length direction.
As is clear from these figures, the viscose rayon filaments used in the present invention are such that one single yarn randomly changes its cross-sectional shape in the yarn length direction, and each single yarn has its cross-section independently. The shape is mutated. Therefore, in the cross section of the yarn composed of a plurality of yarns observed at an arbitrary point, single yarns having various cross-sectional shapes are mixed.

In the present invention, the viscose rayon filament used has a boiling water shrinkage of 4% or less and an initial modulus of 60 to 10
A more favorable result can be obtained when it is 0 g / d. The polyester filament used in the present invention must have an initial modulus of 60 to 100 g / d. 60
If it is less than g / d, it is weak and has a problem in strength.
If it exceeds g / d, the hand becomes hard, which is not desirable. A more preferred range for the initial modulus is 70-1.
00 g / d. Such a polyester continuous fiber is disclosed, for example, in Japanese Patent Publication No. 4-33887.

The polyester long fiber according to the present invention has a mechanical loss tangent (tan) at a measurement frequency of 110 Hz.
[delta]) and _max, the mechanical loss tangent and a Tmax is a temperature showing a maximum must be polyester long fibers present in the range that satisfies any of the following Equations 1 and 2. 105 ° C. <Tmax ≦ 115 ° C. and 0.135 <(t
an δ) _max ≦ 0.190... Equation 1 110 ° C. <Tmax ≦ 115 ° C. and 0.110 ≦ (t
an δ) _max ≦ 0.135 Formula 2 In such a polyester continuous fiber, the crystalline portion and the amorphous portion constituting the fine structure of the fiber are well-balanced, and as a result, as shown in FIG. (Tan δ)
_It exhibits a unique fine structure in which _max occupies a specific range of area.

[0024] In the case of a mixed yarn of polyester filaments outside the range of the above formulas 1 and 2, yarn breakage occurs in the false twisting step, or elongation occurs at a relatively low load, and crimp disappears. It is not preferable. The boiling water shrinkage of the polyester filament used in the present invention is preferably 4% or less.

The single denier of the viscose rayon filament used in the present invention is 0.8 to 5 denier, preferably 1 to 5 denier.
3 denier, 10 to 100 filaments,
Preferably, the number is 20 to 70. The single yarn denier of the polyester continuous fiber is 0.5 to 3 denier, preferably 1 to
2.5 denier, 10 to 100 filaments
And preferably 20 to 70. In addition, the ratio of the total denier of both long fiber yarns is preferably 2/1 to 1/1 for viscose rayon long fiber yarn / polyester long fiber yarn.

The viscose rayon filament yarn and polyester filament yarn are entangled and mixed by turbulent air.
The feed rate of both long fiber yarns in the blended fiber is preferably 0 to 10%, and may be interlace blended or Taslan blended fiber.
If necessary, a slight amount of water may be imparted to the viscose rayon filament yarn to make the yarn easy to fly.
The number of confounds is 20 to 100 pieces / m, preferably 30 to 80 pieces / m. If it is less than 20 pcs / m, the weaving property is poor, and
If it exceeds 0 / m, the feeling of swelling is insufficient, which is not preferable.

In the present invention, the twist is reduced by twisting the mixed fiber. Therefore, it is more preferable to twist the mixed fiber at 100 times / m or more. The mixed fiber of the present invention is given a swelling feeling in a scouring step or the like after usually being knitted and woven. In knitting and weaving, it may be mixed with other fiber yarns within a range that does not impair the object of the present invention.

[0028]

EXAMPLES The present invention will be described below in detail with reference to examples, but the present invention is not limited to these examples. The methods for measuring and evaluating properties such as initial modulus and boiling water shrinkage in the present invention are described below. Initial modulus: According to JIS-L-1013 method,
The tensile strength (g / d) at 1% elongation is calculated. Mechanical loss tangent (tan δ): JP-B-4-3388
According to the measuring method described in Japanese Patent Publication No. Boiling water shrinkage: According to JIS-L-1095A method. Number of entangled yarns: According to JIS-L-1013 method. Bulkiness: Using a plate winding machine, apply a load of 50 g to the spindle, set Western paper on the plate in advance, and wind six layers of test yarn thereon. Subsequently, the thickness of the test yarn wound on the plate was measured using an upright dial gauge type R1-1B manufactured by Shimadzu Corporation, and the bulkiness was calculated as described below.

Sample thickness average (mm) = measured value (n =
5) Average value (mm) -Plate thickness (mm) Bulkiness = average thickness of sample (test yarn) / average thickness of comparative yarn As a comparative yarn, viscose rayon filament 1
20d / 50f was used.

[0030]

Examples 1 and 2 and Comparative Examples 1 to 3 Various viscose rayon filaments (75d / 33f) shown in Table 1 and various polyester filaments (50d / 24f) shown in Table 3 were subjected to high-speed fluid (turbulent air). The fibers were entangled and blended under the conditions of an air pressure of 5 kg / cm ² G, an overfeed rate of 0.8%, and a yarn speed of 200 m / min. Plain fabrics were woven using warp yarns and weft yarns (87 warps / inch, 78 wefts / inch).

Subsequently, scouring, dyeing, and finishing were performed according to a conventional method (102 wires / inch, 85 wires / inch). Table 2 shows the degree of variation of the cross-sectional shape of the various viscose rayon filaments shown in Table 1, and Table 4 shows the performance evaluation results of the mixed fiber and the plain fabric using the same. From Table 4, it is apparent that Examples 1 and 2 are uniformly mixed as compared with Comparative Examples 1, 2 and 3, and the woven fabric has a swelling feeling and is excellent in flexibility.

The bulkiness of the mixed fiber was 2.4 in Example 1, 2.7 in Example 2, 2.7 in Comparative Example 1, 1.4 in Comparative Example 2, and 1.3 in Comparative Example 3. 1.3 and Examples 1 and 2
As for Comparative Examples 1, 2 and 3, mixed yarns having a swelling feeling were obtained.

[0033]

Example 3 and Comparative Example 4 Using the mixed fiber obtained in Example 1 and Comparative Example 1, a 28GG parchment was made and knitted, followed by scouring, dyeing and finishing by a conventional method. The results are shown in Table 5. As is clear from Table 5, Example 3 has a feeling of swelling and is excellent in flexibility as compared with Comparative Example 4.

[0034]

[Table 1]

[0035]

[Table 2]

[0036]

[Table 3]

[0037]

[Table 4]

[0038]

[Table 5]

[0039]

According to the present invention, a viscose rayon filament and a polyester filament are uniformly blended, a swollen feeling, a blended fiber which does not degrade the flexibility of viscose rayon, and such a yarn. A woven or knitted fabric consisting of strips can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram exemplifying an index for judging a variation in a cross section of a viscose rayon long fiber used in the present invention.

FIG. 2 is an enlarged and traced cross-sectional shape of a single yarn of viscose rayon fiber used in the present invention.

FIG. 3 is an enlarged and traced cross-sectional shape of a single thread of a conventional viscose rayon fiber.

FIG. 4 is a view showing a variation in a yarn length direction of a cross section of a single viscose rayon fiber used in the present invention.

FIG. 5 is a graph showing Tmax of a polyester filament used in the present invention.
And (tan δ) _max (shaded area).

[Explanation of symbols]

 1 Straight lines 2, 3, 4 viscose rayon fiber single yarn representing the cross-sectional shape of fiber

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) D02G D03D D01F

Claims (3)

(57) [Claims] 1. A viscose rayon long fiber in which the cross-sectional shapes of single yarns independently vary irregularly in the yarn length direction;
The initial modulus is 60 to 100 g / d, and the mechanical loss tangent (tan δ) _{max at} a measurement frequency of 110 Hz.
A maximum value of the temperature (Tmax) and the maximum value of the tan δ (tan δ) _max . 105 ° C <Tmax ≦ 115 ° C and 0.135 <(t
an δ) _max ≦ 0.190 Formula 1 110 ° C. <Tmax ≦ 115 ° C. and 0.110 ≦ (t
an δ) _max ≤ 0.135 ...... Equation 2 2. A woven or knitted fabric comprising at least a part of the mixed fiber according to claim 1. 3. A mixed fiber obtained by twisting the mixed fiber according to claim 1 at 100 times / m or more.