JPH07207538A - Combined filament yarn - Google Patents

Abstract

PURPOSE:To obtain a combined filament yarn having swelling feeling, not losing softness of a viscose rayon filament itself by uniformly combining the viscose rayon filament with a polyester filament and to obtain a woven and a knitted fabric consisting of the yarn. CONSTITUTION:This combined filament yarn is composed of a viscose rayon filament yarn irregularly and each independently changing the cross-sectional shape of single yarn in the yarn length direction and a polyester filament which exists in such range that a temperature (Tmax) at which dynamic loss tangent (tan delta)max in 110Hz frequency measured in 60-100g/d initial modulus exhibits maximum and maximum value of tan delta (tan delta)max satisfy either item of (1): 105 deg.C<Tmax<=115 deg.C and 0.135<(tan delta)max<=0.190 or (2): 110 deg.C<Tmax <=115 deg.C and 0.110<(tan delta)max<=0.135. This woven fabric contains at least a part of the combined filament yarn.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Intertwisted and mixed yarns of synthetic fibers typified by polyester fibers and natural fibers or regenerated cellulose fibers are interwoven and woven and widely used for clothing and the like. However, in such a composite, the characteristics of natural fibers / regenerated cellulose fibers and synthetic fibers are significantly different,
Uniform compounding is extremely difficult.

Particularly, in the case of a mixed filament yarn of a normal polyester filament and a regenerated cellulose filament, the former has a higher heat shrinkage stress and a higher initial modulus. However, there is a problem in that the feeling of swelling is insufficient, the fibers are separated, and the soft texture peculiar to the regenerated cellulose fiber is impaired. Proposals to solve such problems are already known.

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

[0005]

That is, the present invention provides a mixture of polyester long fibers and regenerated cellulose fibers which are uniformly mixed, have a feeling of swelling, and do not lose the flexibility peculiar to regenerated cellulose fibers. The purpose is to provide yarn.

[0006]

DISCLOSURE OF THE INVENTION The inventors of the present invention have studied from the fact that, in order to achieve the object of the present invention, that is, uniform fiber mixture, polyester fiber filaments and regenerated cellulose fibers are mixed with a high-speed air flow. As a result of repeated intensive studies including the above, it is very important to disperse the regenerated cellulose long fibers to the level of single yarn in order to obtain a uniform mixed fiber, and to disperse the single yarn of the cellulose fibers. The cross-sectional shape at the level is closely related and plays an important role, and the cross-sectional shape is better than the round cross-section, and even if it is the cross-section, the chrysanthemum peculiar to viscose rayon The present inventors have completed the present invention by finding that the uniformity of the obtained mixed yarn 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. 1. The invention claimed in the present invention is as follows.

The viscose rayon filaments in which the cross-sectional shape of each single filament independently changes irregularly in the filament length direction, and the initial modulus is 60 to 100 g / d, and the mechanical loss tangent at a measurement frequency of 110 Hz. (Tanδ) _max is the maximum temperature (Tmax) and the maximum value of tanδ (t).
A mixed filament yarn comprising an polyester long fiber having an δ) _max satisfying either of the following formulas 1 and 2.

105 ° C. <Tmax ≦ 115 ° C. and 0.
135 <(tan δ) _max ≦ 0.190 Formula 1 110 ° C. <Tmax ≦ 115 ° C. and 0.110 ≦ (t
an δ) _max ≦ 0.135 Formula 2 2. A woven or knitted fabric comprising at least a part of the mixed fiber according to the above 1. 3. A mixed fiber prepared by further twisting the mixed fiber according to the above 1 at 100 times / m or more.

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

Since each single yarn constituting the viscose rayon continuous filaments of the present invention has an independent variation in the cross-sectional shape, a non-twisted yarn in which each yarn has a different cross-section at each position Is. This is because the cross-sectional shape is changed over a short distance, so that single yarns of various shapes are naturally mixed at any yarn position. When entangled and mixed with polyester filaments due to turbulent air due to such a cross-sectional shape, air is blown randomly on each single-yarn cross-section, and the single-yarns disperse very uniformly, resulting in uniform distribution. The present inventors have found that they can be mixed.

The term "mutation of 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 any one or more of C is different. Furthermore, this "differs" means the index A. The difference of B is 10% or more, and the difference of C is 1 or more.

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

[0013]

[Equation 1]

Here, L is the maximum length between any two points on the same cross section of the single yarn, and S is the area of the cross section. Index B: A scale representing the degree of unevenness according to the equation 2

[0015]

[Equation 2]

Here, M is the circumference of the cross section, and S is the area of the cross section. Index C: A scale that represents the degree of unevenness, and is a scale that is represented by the number of straight lines that form the 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 (circumferential length), using an enlarged photograph of a single yarn cross-section, image processing it, converting the cross-section as a set of points and displaying it, and displaying each point on the coordinate plane. Thus, the morphology of the cross section can be quantitatively measured. Such image processing can be performed using, for example, Model E-100 manufactured by Eiko Sangyo Co., Ltd.

Further, 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 taken as the rate of change of the index A. If this value is 90 or less or 110 or more, it is determined to have changed. If the value exceeds 90 and less than 110, it is determined that the value has not changed. Similarly, the index B is determined according to the same criteria as above. Next, the index C is also observed in the same manner, and when the absolute values of the difference between the numbers of the constituent straight lines are different by 1 or more, it is determined that the change has occurred, and when the absolute numbers are the same, it is determined that the index does not change. .

Next, three indices A. It is determined that the cross-sectional shape is not mutated when it is determined that B and C are not changed, and that the cross-sectional shape is mutated otherwise. It was shown in FIGS. 2 to 4 that the cross-sectional shape of a part of the yarn was enlarged and traced to indicate that each of the above single yarns had a cross-sectional shape that was substantially irregularly varied. FIG. 2 is an enlarged trace of the shape of a single yarn fault of viscose rayon fiber used in the present invention. Further, FIG. 3 is an enlarged trace of the shape of a single yarn cross section of a conventional viscose rayon fiber.

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

In the present invention, the viscose rayon filaments used have a boiling water shrinkage of 4% or less and an initial modulus of 60 to 10.
More preferable results can be obtained when it is 0 g / d. The polyester long fibers 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 texture becomes stiff, which is not desirable. A more preferable range of the initial modulus is 70 to 1
It is 00 g / d. Such polyester filaments are disclosed in, for example, Japanese Patent Publication No. 4-33887.

The polyester filament in the present invention has a mechanical loss tangent (tan) at a measurement frequency of 110 Hz.
δ) _max and Tmax, which is the temperature at which the mechanical loss tangent shows the maximum, must be polyester filaments in a range satisfying either of the following formulas 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) Such polyester long fibers have a well-balanced crystalline portion and amorphous portion constituting the fine structure of the fiber. As a result, as shown in FIG. 5, Tmax, (Tan δ)
_It exhibits a unique fine structure in which _max occupies a specific range of area.

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

The single yarn denier of the viscose rayon filament used in the present invention is 0.8-5 denier, preferably 1-denier.
3 denier, 10-100 filaments,
The number is preferably 20 to 70. Single yarn denier of polyester filament is 0.5 to 3 denier, preferably 1 to
2.5 denier with 10-100 filaments
The number is preferably 20 to 70. Further, the total denier ratio of both long fiber yarns is preferably 2/1 to 1/1 of viscose rayon long fiber yarn / polyester long fiber yarn.

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

In the present invention, twisting of such a mixed fiber reduces irritability, so it is more preferable to perform additional twisting of 100 times / m or more. The mixed yarn of the present invention is usually knitted and woven and then given a swelling feeling in a scouring step and the like. When knitting or knitting, other fiber yarns may be mixed within a range not impairing the object of the present invention.

[0028]

EXAMPLES The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples. The methods for measuring and evaluating characteristics such as initial modulus and boiling water shrinkage ratio in the present invention are shown below. Initial modulus: According to JIS-L-1013 method,
The tensile strength (g / d) at 1% elongation is calculated. Mechanical loss tangent (tan δ): Japanese Patent Publication No. 4-3388
This is based on the measuring method described in JP-A-7. Shrinkage rate of boiling water: According to JIS-L-1095A method. Number of entanglement of mixed fiber: 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 6 layers of the test yarn on it. Subsequently, the thickness of the plate-wound test yarn was measured using Shimadzu's upright dial gauge type R1-1B, and the bulkiness was calculated as follows.

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

[0030]

Examples 1-2 and Comparative Examples 1-3 Various viscose rayon filaments (75d / 33f) shown in Table 1 and various polyester filaments (50d / 24f) shown in Table 3 were used as a high-speed fluid (turbulent air). At an air pressure of 5 kg / cm ² G, an overfeed rate of 0.8%, and a yarn speed of 200 m / min, entanglement and mixing were performed, and each level was subjected to additional twisting of 200 T / m, and the obtained mixture was obtained. A plain woven fabric was woven using warp and weft yarns (87 warps / inch, 78 wefts / inch).

Subsequently, scouring, dyeing, and finishing were carried out according to a conventional method (warp 102 pieces / inch, weft 85 pieces / inch). The degree of variation in the cross-sectional shape of the various viscose rayon continuous fibers shown in Table 1 is shown in Table 2, and the performance evaluation results of the above-mentioned mixed fiber and plain woven fabric using the same are shown in Table 4. From Table 4, it is clear that Examples 1 and 2 are mixed more uniformly than Comparative Examples 1, 2 and 3, and the woven fabric has a feeling of bulging and is excellent in flexibility.

The bulkiness of the above-mentioned mixed yarn is 2.4 in Example 1, 2.7 in Example 2, 1.4 in Comparative Example 1, 1.3 in Comparative Example 2, and 1.3 in Comparative Example 3. 1.3 and Examples 1 and 2
In comparison with Comparative Examples 1, 2 and 3, a mixed fiber having a bulging feeling was obtained.

[0033]

[Example 3 and Comparative Example 4] Using the mixed yarn obtained in Example 1 and Comparative Example 1, 28 GG tenjiku was knitted, and scouring, dyeing and finishing were carried out by a conventional method. The results are shown in Table 5. As is clear from Table 5, Example 3 has a swelling feeling 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]

INDUSTRIAL APPLICABILITY According to the present invention, a viscose rayon filament and a polyester filament are uniformly mixed and have a feeling of swelling, which does not impair the flexibility of viscose rayon and the yarn. It is possible to obtain a woven or knitted fabric made of strips.

[Brief description of drawings]

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

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

FIG. 3 is a diagram in which a shape of a single yarn cross section of a conventional viscose rayon fiber is enlarged and traced.

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

FIG. 5: Tmax of polyester filament used in the present invention
It is a figure which shows the range (hatched part) of and (tan (delta)) _max .

[Explanation of symbols]

 1 Straight line showing the cross-sectional shape of the fiber as a representative 2, 3, 4 Viscose rayon fiber single yarn

Claims (3)

[Claims] 1. A viscose rayon filament in which the cross-sectional shape of a single filament independently varies irregularly in the longitudinal direction,
The initial modulus is 60 to 100 g / d, and the mechanical loss tangent (tan δ) _{max at the} measurement frequency of 110 Hz.
Is a polyester filament having a maximum temperature (Tmax) and a maximum tan δ (tan δ) _max satisfying either of the following formulas 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 ...... 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 prepared by further twisting the mixed fiber according to claim 1 100 times / m or more.