JPH09111568A - Water absorbing bulky conjugate spun yarn - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain spun yarn superior in appearance and handle, lightweight, excellent in bulkiness, proper in tension, texture and elasticity, having superior water absorbing/sweat absorbing properties and rapidly drying properties, permanently maintaining high water absorbing properties and extremely slightly causing reduction in bulkiness in wearing. SOLUTION: This water absorbing bulky conjugate spun yarn is constituted by combining a filament having two or more octopus trap-shaped recessed channels having inlet width smaller than the maximum width of an interior cavity part communicating with in the fiber axis direction of a filament having 5dpf-30dpf, the inlet width of the recessed channel smaller than 0.9 the fiber diameter of staple fiber as a conjugate component and >=10%, and <40% total hollow ratio when the inlet of the recessed channel is closed by the tangential line of the outer periphery with a staple fiber.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is lightweight, bulky and stretchable.
The present invention relates to a water-absorbent bulky composite spun yarn suitable for clothing which is rich in waist and excellent in water-absorbing property. More specifically, it relates to a water-absorbent bulky composite spine of a filament having a large single fiber fineness and an open hollow portion and a staple fiber. It is about yarn.

[0002]

2. Description of the Related Art Conventionally, spun yarn has been used as a fiber for woven and knitted clothes.
Due to its structural spots and fluff present on the surface, a fabric having a unique texture that is slightly different from the fabric obtained from the filament due to its natural appearance and warm touch is obtained, and it is useful as a fiber for clothing. Came. However,
In order to satisfy the demands for the advanced functions required for the recent woven and knitted fabrics and the enhancement of the product competitiveness by specializing the product functions, only the existing staple fiber for spinning has been targeted and the existing spinning process has been performed. In spun yarn created using only
In terms of card passing in the spinning process, operation stability in the pre-spinning process / spinning process, yarn unevenness, etc., there is a limit applicable to the fiber length, single fiber fineness, single fiber shape, and single fiber physical properties of the fiber used. Chemically modified filaments and atypical cross-section filaments with special functions that cannot meet the new required functions such as weight reduction, bulkiness, rigidity such as tension and waist, water absorption / quick drying, antistatic property, and delicate texture demand. It has become essential to meet the above-mentioned required functions and consumption needs through the development of a composite spun yarn with, and many attempts have been made.

That is, for example, as disclosed in Japanese Patent Laid-Open No. 7-42039, as a method for improving elasticity by tensioning a cloth, the filament of one component constituting the composite spun yarn is made high denier. As a method for improving the bending rigidity of a composite spun yarn and a method for imparting a lightweight and bulky feeling to a fabric while having a texture similar to a fabric made of a natural fiber spun yarn, JP-B-61-69189 and JP-B-63- As proposed in Japanese Patent No. 12189, etc., a composite mixed yarn for clothes, in which hollow multifilaments and non-hollow multifilaments are mixed, has been developed. Furthermore, with this improvement, a natural fiber-like texture and a lightweight and bulky feeling have been achieved. As a measure to add tension and waist, as shown in JP-A-7-118987, the hollow ratio is 10% or more and the fineness is 8 to 70.
A composite mixed yarn in which a denier monofilament is mixed with a multifilament having a fineness of 3 denier or less to satisfy both weight reduction and elasticity is proposed and proposed.

Further, in addition to these, in addition to these, a multifilament of thermoplastic synthetic fiber is arranged in the core portion as in the method disclosed in JP-A-62-28426 as a method for imparting sweat absorption / water absorption performance, A composite spun yarn in which staple fibers of thermoplastic synthetic fiber are arranged in the middle part and staple fibers of natural fiber are arranged in the outer part has been developed and proposed, but since these developed products are still inferior in quick drying property, In order to improve this defect, as disclosed in JP-A-7-97745, a core yarn in which staple fibers are wound around the outer peripheral portion of a hollow fiber (C-shaped cross-section yarn) having an opening has been developed and proposed. ing.

As another attempt to improve sweat absorption and water absorption, as disclosed in Japanese Patent Laid-Open No. 52-18918, a method of using a modified cross-section yarn having a special cross-section shape having open capillaries on the fiber surface is also available. Although proposed, these modified cross-section yarns are easily crushed and crushed due to external stress,
There was a defect that the open capillaries were crushed and the durability of sweat absorbency and water absorbency was inferior. There is also proposed the one disclosed in Japanese Patent Publication No. 62-53605, which has a specific atypical cross-section that makes it difficult to fit even when the filaments are in contact with each other.

[0006]

However, although the prior art discloses a technique for satisfying the specific required function recognized as necessary at that time, all the required functions currently required are disclosed. There is no disclosure of comprehensive technology and measures to satisfy it. Therefore, due to structural yarn spots and fluff present on the surface, which have recently been highly demanded, while maintaining the texture unique to the fabric, weight reduction, bulkiness, rigidity such as tension and waist, water absorption, quick drying, antistatic property, etc. It is a problem to be solved in the present invention to develop and provide a spun yarn for a woven or knitted fabric having all of the required functions of 1.

The technical problems to be overcome by the present invention include:
In the course of increasing the required functions, the conventional technology is merely a proposal of a means for giving only a specific function that was considered necessary at that time, and thus is insufficient for achieving the purpose as described below. In the method using core yarn using denier filament (Japanese Patent Laid-Open No. HEI 7-), it is necessary to simply give the woven and knitted product tension and stiffness, and (2) a composite mixed fiber in which hollow multifilaments and non-hollow multifilaments are mixed. In the method using yarn (Japanese Patent Publication No. 61-69189 and Japanese Patent Publication No. 63-12189), the woven and knitted products are not merely bulky and lightweight, and both techniques of (3) (1) and (2) are defined. A method using a core yarn composed of a thick denier hollow monofilament and a fine denier multifilament, which was developed as an improved technique of Japanese Patent Application Laid-Open No. 7-11898.
No. 7 publication) succeeded in imparting both required functions of making bulky and lightweight and imparting tension and waist, but imparting water-absorbing and sweat-absorbing properties and quick-drying properties were not sufficient at all.

(4) A composite spun yarn in which synthetic fiber multifilaments are arranged in the core portion, thermoplastic synthetic fiber staple fibers are arranged in the middle portion, and natural fibers are arranged in the outer peripheral portion in order to impart water absorption and sweat absorption. According to the method (Japanese Patent Laid-Open No. 62-28426), although the texture and the water-absorbing and sweat-absorbing properties are satisfied, the quick-drying property is poor and other required functions are insufficient. In the method using a modified cross-section yarn having an open capillary path on the surface (Japanese Patent Laid-Open No. 52-18918), the open capillary path is easily crushed by external pressure, and there is no permanent durability of water supply and sweat absorption. (4), (5)
In the method (corresponding to Japanese Patent Laid-Open No. 7-97745) in which a C-shaped cross-section filament yarn is arranged in the core part and a yarn is wound around the outer peripheral part, which is an improved technique of JP-A-7-97745,
Securing the number of capillaries for sweat absorption, maintaining crush resistance due to external pressure, and preventing water absorption and sweat absorption and bulkiness deterioration due to disappearance of capillaries by entering (fitting) fibers wound around the outer circumference into the capillaries. Therefore, the denier of the C-shaped cross-section yarn cannot be made very thick, and defects that are inferior in lightness and bulkiness cannot be avoided, and the permanent durability of water absorption and sweat absorption due to the inclusion of the peripheral constituent fibers into the capillary can be sufficiently avoided. There was a difficult point that I could not achieve the purpose.

(7) In order to prevent a decrease in water absorption / perspiration due to the disappearance of the capillary due to the entry (fitting) of the adjacent fibers into the water absorption / perspiration capillary, the opening of the recess has a maximum diameter of 1
Application of a modified cross-section filament yarn having a specific cross-section of ½ or less (Japanese Patent Publication No. 62-53605).
However, since the fiber composition is a synthetic fiber filament yarn having an atypical cross section, it is impossible to avoid the defect that the texture peculiar to the spun yarn cannot be obtained. Therefore, it is a problem to be solved by the present invention to solve the technical problems that cannot be achieved by such conventional techniques and to develop and provide means and techniques for providing fibers for a woven or knitted fabric satisfying all required functions. .

[0010]

[Means for Solving the Problems] The fiber for woven or knitted fabric provided and developed in the present invention has at least (a) appropriate strength and elongation (b) fluff present on the surface retains a texture unique to a fabric (C) It is lightweight and bulky, and its long-lasting retention is high. (D) It has appropriate rigidity such as tension and waist. (E) It has excellent water absorption and sweat absorption. Its long-term retention is high, and (f) it has quick-drying properties,
(G) It is necessary to combine all the functions of having antistatic property, and in selecting any required function giving means / measures, a combination of means / measures that do not interfere with other required functions is performed. Is an essential requirement.

Summarizing the means and measures effective for imparting the required functions, which have been earnestly studied from such viewpoints, the basic constitutional requirements for obtaining fibers satisfying (a) required functions (a) to (d) are summarized as follows. , Thick denier (5 dpf ~ 30 dp
It is necessary to apply a so-called core yarn, which is a composite spun yarn in which a hollow fine denier thermoplastic synthetic fiber is wound around the outer periphery of the filament of the thermoplastic synthetic fiber having the hole groove of f), and (b) required function (c) In order to obtain a fiber satisfying both (a) to (f) and having a high permanent retention of the functions of (c) and (e), the filament of the thermoplastic synthetic fiber forming the core of the core yarn is The outer circumference of the fiber cross section has a plurality of octopus-shaped hollow grooves along the fiber axis direction, and the groove width of the entrance of the medium-wide octopus-shaped hollow groove is a thermoplastic material wound around the outer circumference of the core yarn. The diameter is less than 0.9 times the diameter of the synthetic fiber staple fiber, and the hollow ratio of the octopus-shaped hollow grooved filament forming the core portion of the core yarn when closed at the circumscribed tangent to the groove portion is 10% or more and less than 40%. Necessary In order to obtain the best effect, the staple roving of thermoplastic synthetic fiber of hollow fine denier and the octopus-shaped hollow grooved filament are combined and twisted in the opposite directions of the filament twisting direction and the staple fiber roving twisting direction. Needed for.

(C) Since the required function (g) is imparted, as defined in (a) and (b), the constituent fibers essential for achieving the purpose are the filaments of the thermoplastic synthetic fiber and the staple fibers. By blending a known antistatic agent with the thermoplastic synthetic fiber, the object can be achieved without impairing all other required functions. I reached the conclusion.

That is, the constituent requirements of the fiber satisfying all the required functions and satisfying the above constituent elements are, as defined in the claims, as essential constituent elements (claim 1) [requirement 1] ] Composite filaments and staple fibers are combined to form a composite spun yarn, [Requirement 2] The filaments constituting the spun yarn have a fineness of 5d.
PF or more and 30 dpf or less, and having two or more octopus-shaped concave grooves communicating with the outer peripheral surface of the filament in the longitudinal direction of the filament and having an entrance width smaller than the maximum width of the internal void portion, and the entrance widths of the concave grooves are complex. A composite spun yarn that is smaller than 0.9 times the fiber diameter of the counterpart staple fiber and has a total hollow ratio of 10% or more and less than 40% when the entrance of the concave groove is closed by an outer peripheral tangent. Can achieve the purpose.

As more preferable additional requirements, (claims 2 and 3) [Requirement 3] In the composite spun yarn defined in claim 1, the staple fiber of the composite partner is a polyester staple fiber having a hollow ratio of 10 to 40%. [Requirement 4] The composite spun yarn according to claim 1, wherein the filament twisting direction and the staple fiber twisting direction are opposite to each other. By doing so, it is possible to obtain a product having a performance that achieves a sufficiently high degree of purpose.

These modified cross-section yarns having a specific cross-sectional structure can be easily manufactured by utilizing publicly known / existing techniques by the development of synthetic fiber manufacturing technology (spinning nozzle design / manufacturing technology for modified cross-section, spinning technology). I can. Further, as shown in FIG. 3, the core yarn in the present invention is produced by supplying a roving yarn of staple fibers forming an outer peripheral portion to a draft zone under a proper tension using a spinning machine to form a core portion. Can be manufactured by supplying just before the front roller and plying yarn. In FIG. 3, A is a filament forming a core portion, and B is a roving yarn made of staple fibers forming an outer peripheral portion.

The twisting conditions for producing the intended core yarn are preferably selected so that the twisting coefficient is K = 3.0 to 4.7, and is defined in [Requirement 4]. In order to produce a composite spun yarn in which the twisting direction of the formed filament (the spiral direction of the octopus-shaped concave groove on the outer periphery of the filament) and the twisting direction of the staple fiber bundle are opposite to each other, the twisting applied to the filament yarn during twisting is performed. Twisting in the opposite direction is twisted in advance by a certain number or more, and the yarn is combined with a roving made of staple fibers forming the outer peripheral portion by the spinning machine to form a plied yarn. In the thus obtained composite spun yarn, since the spiral direction of the octopus-shaped concave groove on the outer peripheral portion of the filament and the twisting direction of the roving yarn of the staple fiber are opposite to each other, the staple fiber wound around the concave groove on the outer peripheral portion of the filament is A composite spun yarn that is difficult to fit.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The significance, necessity and effect of each constituent element of the present invention will be described in more detail below. As defined in [Requirement 1], the significance of forming the basic structure of the fiber for a woven or knitted fabric of the present invention by a composite spun yarn in which a filament and a staple fiber are combined, a so-called core yarn, is important.・ It is effective to make the denier of the constituent fibers thicker to have a firmer waist, but if the denier is increased enough to give sufficient tension and waist in a spun yarn composed of conventional staple fibers, it will pass the card. And problems such as operational stability in the pre-spinning process and spinning process and securing of yarn unevenness occurred, and the strength and elongation physical properties of the resulting fiber also became problematic, making it impossible to achieve sufficient thick denier. However, in the core yarn in which the core-constituting fiber is a filament yarn, it is possible to select a filament of any wide range of thickness, and the above-mentioned problems in the conventional spun yarn are solved all at once. It can be. Thus, the strength and elongation of the woven or knitted fabric, elasticity and stiffness can be imparted by the core filament, and the staple fiber wrapped around the outer periphery of the core yarn is dedicated to achieving the improvement objectives such as appearance and texture. The fibers can be arbitrarily selected, and the most appropriate product design can be achieved very effectively.

The definition of the denier range (5 dpf or more and 30 dpf or less) of the core-constituting filament of the core yarn defined in [Requirement 2] is such that an appropriate fiber denier is applied to impart appropriate tension, waist and texture to the woven or knitted fabric. The core width of the core-constituting filament is specified, and the shape and shape of the core-constituting filament are specified, that is, the inlet width communicating with the outer peripheral surface of the core-constituting filament in the longitudinal direction of the filament is smaller than the maximum width of the internal void portion. Octopus-shaped concave groove (capillary)
2 or more, the entrance width of the recessed groove is smaller than 0.9 times the fiber diameter of the staple fiber of the composite partner, and the total hollow ratio when the entrance of the recessed groove is closed by the outer peripheral tangent is 10% or more. A cross-sectional shape of less than 40% is a very important and effective regulatory requirement for imparting lightweight and bulkiness and water absorption / perspiration absorption that are highly durable to the woven / knitted fabric and do not change over the course of use. .

Therefore, the significance of the specification of the porosity range and the shape and form of the core-constituting filament will be described in more detail below. The specific shape and form of the core-constituting filament defined in [Requirement 2] is that the outer periphery of the filament has an octopus-shaped concave void with an inlet width smaller than the internal pore width, and the concave void is in the fiber axis direction. A core yarn composed of core filaments having such a shape and shape because it is a filament having a shape and shape connected as a continuous concave groove (capillary path) and having an octopus-shaped concave communication groove (capillary path) on the outer periphery of the filament. The woven or knitted fabric produced by using, when water or sweat is wet,
The filament is rapidly sucked and held in the octopus-shaped concave communication groove (capillary path) by a capillary phenomenon. When this woven or knitted fabric in a wet state is placed in an atmosphere where it is dried, the water (sweat) retained by the fibers is retained only by the capillary lanes of the hydrophobic synthetic fiber and has no affinity. Since it is not adsorbed with a high adsorption power, it can be easily diffused and evaporated. That is, it has excellent water-absorbing and sweat-absorbing properties and also has a quick-drying property.

Further, as shown in FIG. 1, the core-constituting filament defined in [Requirement 2] is an octopus-shaped filament having an entrance width communicating with the outer peripheral surface of the filament in the filament longitudinal direction smaller than the internal cavity portion width. It has two or more concave grooves (capillary passages), the entrance width of the concave grooves is smaller than 0.9 times the fiber diameter of the staple fiber of the composite partner, and the total width when the entrance of the concave grooves is closed by an outer peripheral tangent line. Hollow rate is 10% or more 40
Since it is designed to have a cross-sectional morphology of less than%, adjacent staple fibers become octopus-shaped concave grooves (capillary paths) of the filament even during continuous use of the woven or knitted fabric made of the fiber. It is fitted to fill the water-absorbing / perspiring capillary path, and the water-absorbing / perspiring performance is not deteriorated, and the lightness / bulkyness is not deteriorated.

Further, the denier range of the core-constituting filament specified in [Requirement 2] (5 dpf or more 30
dpf or less), more fine octopus-shaped concave grooves (capillary passages) are provided to select the fineness necessary for maintaining appropriate texture and maintaining the strength and elongation properties of woven and knitted fabrics, and to provide water absorption and sweat absorption performance. This is the result of setting the proper range in consideration of the requirement for thick denier to increase the sweat absorption capacity.

The meaning and the basis for setting the total hollow ratio to be 10% or more and less than 40% when the entrance of the concave groove of the core-constituting filament specified in [Requirement 2] is closed by the outer peripheral tangent line are as follows:
An irregular cross-section is set by setting the upper limit of hollow ratio above the allowable limit where flattening and crushing of the hollow part do not occur due to the compression action due to external pressure during the manufacturing process and during use, and from the viewpoint of ensuring lightness and bulkiness. An appropriate hollow ratio range was set in consideration of the limit of yarn manufacturing technology.

(Claim 2) In the composite spun yarn as defined in claim 1 defined in [Requirement 3], the staple fiber of the composite partner is a polyester staple fiber having a hollow ratio of 10 to 40%. It provides the required functions such as light weight, bulkiness and quick drying, and stipulates specific conditions for obtaining the best performance.For example, the staple fiber of the composite partner is cotton or viscose rayon staple fiber, etc. Does not exclude the use of.

(Claim 3) The ply-twisting condition of the composite spun yarn in which the twisting direction of the filaments and the twisting direction of the staple fibers defined in [Requirement 4] are opposite to each other is as follows.
The spiral direction of the octopus-shaped concave groove communicating with the outer peripheral surface of the filament forming the core of the core yarn in the filament longitudinal direction, and the twist direction of the staple fiber bundle (fiber arrangement direction)
Since it can be in the opposite direction, it is possible to effectively prevent the staple fibers from fitting into the octopus-shaped concave groove of the filament, and the staple fibers are fitted into the concave groove of the filament. It is extremely effective in preventing deterioration of water absorption / dryness with time and deterioration of bulkiness with time. This method will be further described with reference to a specific example. For example, in the case of producing a composite spun yarn of 30th count single yarn with Z twist and a twist coefficient of 3.7, use a filament of S twist of 800 times / m or more. Good.

[0025]

EXAMPLES The embodiments and effects thereof will be specifically described below with reference to Examples, which show preferred embodiments of the present invention and do not specify the configurations described in the claims. Absent. [Example 1] 2 having a cross-sectional shape shown in FIG.
A twisted yarn of a filament made of polyethylene terephthalate of 0d / 2f was put with S twist of 1200 times / m, and 85
Wet heat setting was performed to prevent twisting at ℃. The entrance width of the octopus-shaped concave groove (capillary path) communicating with the outer peripheral surface of the filament in the longitudinal direction of the filament was 11 μm. Separately, a staple fiber roving made of polyethylene terephthalate having a circular cross section of 1.5 d / f and a mean fiber length of 36 mm with a hollowness of 25% was prepared, and the twisted filament was introduced into the draft zone of the spinning machine shown in FIG. Was supplied from before the front roller, and was twisted in the Z direction together with the draft yarn of staple fibers having a twist coefficient of 3.7 to obtain a composite spun yarn of English count 30 count.

This composite spun yarn had a so-called core yarn of a two-layer structure in which staple fibers were wound around a filament having an S twist of about 400 turns / m on the core. Using this composite spun yarn as warp and weft, the warp density is 135 /
A plain weave having a weft density of 75 yarns / in was obtained. This plain woven fabric was finished through a usual finishing process, its characteristics were evaluated, and the evaluation results shown in Table 1 were obtained.

[0027]

[Table 1]

As shown in Table 1, this woven fabric had excellent bulge, bulkiness and elasticity, and was excellent in water absorption and sweat absorption. It was also excellent in bulk retention and water absorption retention. In addition, the warp and weft constituting the woven fabric
When the cross section was taken out from 0 places and observed by a scanning electron microscope, no fitting of one staple fiber was found in the octopus-shaped concave void of the filament.

The performance evaluation was performed according to the following method. (Measurement of Water Absorption) Improved Rollers Method [JIS L0217 103 Method] 10 g of a sample obtained by repeating drying 30 minutes at 130 ° C. for 30 minutes with a tumble dryer was sampled, immersed in ion-exchanged water for 3 minutes, and spread on a wire mesh. And leave for 1 minute (W
g) is calculated and the water absorption is calculated from the following formula. Water absorption rate (%) = {(W-10) / 10} × 100 (bulkness) The specific volume was obtained and evaluated from the fabric thickness and the basis weight (g / m ² ) measured with a measured load weight of 1 g / cm ² . . (Bulk retention rate / Water absorption retention rate) The bulkiness and water absorption after washing are measured by repeating selection and drying 50 times with a household washing machine and tumble dryer, and the bulkiness and water absorption before washing are respectively measured. The bulk retention rate / water absorption retention rate is calculated from the following equation. Bulk retention rate (%) = {(loftness after washing-loftness before washing) /
Bulkiness before washing} × 100 Water absorption retention rate (%) = {(Water absorption after washing-Water absorption before washing) / Water absorption before washing} × 100 (Tension, waist, elasticity) Five-level evaluation by sensory evaluation However, 5 was excellent, 1 was acceptable, and the evaluation opinion and the reason for not being good were added.

[Example 2] A composite spun yarn was obtained in the same manner as in Example 1 except that the number of twists of the filament used was 15 / m (S direction), and woven in the same manner to obtain a cloth. The characteristics were evaluated and the evaluation results shown in Table 1 were obtained. Like the cloth of Example 1, this cloth was also excellent in bulge, bulkiness, lightness, elasticity, and water absorption / perspiration. It was also excellent in bulk retention and water absorption retention. Further, when the warp yarns and the weft yarns constituting the woven fabric were extracted from arbitrary 20 places and the cross section thereof was observed by a scanning electron microscope, the spacing between the filaments was slightly larger than in the case of Example 1, and the octopus-shaped concave void of the filaments was found. One fit of staple fiber to the was found.

[Example 3] A composite spun yarn was produced in the same manner as in Example 2 except that the staple fiber used was a cotton fiber having an average fiber length of 27 mm. The characteristics evaluation results are shown in Table 1. Similar to Example 1, this woven fabric was also a fabric excellent in bulge, bulkiness, lightness, elasticity, and water absorption / perspiration absorption. Moreover, it was also excellent in bulk retention rate and water absorption retention rate. Further, the result of the similar observation with the scanning microscope revealed that the distance between the filaments was larger than that in Example 1, and the number of the staple fibers fitted in the octopus-shaped concave voids of the filaments was slightly large, that is, three.

[Comparative Example 1] The cross-sectional shape of the filament used was changed to that of FIG. 2A, and the entrance width of the octopus-shaped concave groove (capillary path) communicating with the outer peripheral surface of the filament in the filament longitudinal direction was set to 15 μm. The staple fiber used is 1.5d / f of solid circular cross section, fiber length 36mm
A composite spun yarn was obtained and woven into fabric in the same manner as in Example 2 except for the above. The performance evaluation results of this woven fabric are shown in Table 1. Although the elasticity of this woven fabric was at a sufficient level, the woven fabric was inferior in lightness / bulkiness, water absorption / perspiration absorption and water absorption retention. In addition, the results of the same observation using a scanning microscope showed that the staple fibers were often fitted into the octopus-shaped concave voids of the filament, and 80% of them were filled with the fitting, resulting in little real space, lightness, bulkiness, and water absorption and sweat absorption. Was clearly inferior.

[Comparative Example 2] The cross-sectional shape of the filament used was changed as shown in FIG. 2B, the filament denier was also changed to 18d / 6f, and an octopus-shaped concave groove communicating with the filament longitudinal direction on the outer peripheral surface of this filament was used. A composite spun yarn was obtained and woven into a fabric in the same manner as in Comparative Example 2 except that the entrance width of the (capillary) was set to 6 μm. The performance evaluation results of this woven fabric are shown in Table 1.
The cloth was inferior in bulkiness, water absorption / perspiration absorption, and water absorption retention.

[Comparative Example 3] The cross-sectional shape of the filament used is as shown in FIG.
A composite spun yarn was obtained in exactly the same manner as in Comparative Example 1 except that the entrance width of the octopus-shaped concave groove (capillary path) communicating with the filament longitudinal direction on the outer peripheral surface of this filament was changed to 16 μm. Was woven to obtain a cloth. The results of performance evaluation of this woven fabric are shown in Table 1, and although the bulk retention rate and water absorption retention rate were excellent, the fabric was not suitable for clothing because of its high rigidity and rugged and rough texture.

[Comparative Example 4] The cross-sectional shape of the filament used was the same as the circular hollow fiber shown in FIG.
Inlet width was 0 μm], and a composite spun yarn was obtained and woven into fabric in the same manner as in Example 2. The results of performance evaluation of this woven fabric are shown in Table 1. The fabric was excellent in lightness, bulkiness, elasticity, bulk retention rate and water absorption retention rate, but had no water absorption / sweat absorption.

[0036]

Since the present invention is configured as described above, it has the following effects. That is, the water-absorbent bulky composite spun yarn of the present invention has excellent appearance and texture, is lightweight and has excellent bulkiness, has appropriate tension, waist, and elasticity, and has excellent water-absorption, sweat-absorption and quick-drying properties, It is possible to provide a fabric which has little bulkiness during use, changes with time in water absorption, has a high water absorption capacity permanently, and has extremely little loss in volume when worn.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a filament used in the present invention.

FIG. 2 is a cross-sectional view of a comparative filament outside the scope of the present invention.

FIG. 3 is a conceptual diagram showing an outline of an apparatus and a manufacturing process used for manufacturing the composite spun yarn (core yarn) of the present invention.

Claims (3)

[Claims] 1. A composite spun yarn composed of a filament and a staple fiber, wherein the filament has a fineness of 5 dpf or more and 30 dpf or less, and an entrance width communicating with the outer peripheral surface of the filament in the filament longitudinal direction is an internal void portion. It has two or more octopus-shaped concave grooves smaller than the maximum width, and the entrance width of the concave grooves is smaller than 0.9 times the fiber diameter of the staple fiber of the composite partner, and the entrance of the concave grooves is closed by an outer peripheral tangent. When the total hollow ratio is 10% or more 4
A water absorbent bulky composite spun yarn characterized by being less than 0%. 2. The staple fiber to be composited has a hollowness of 10 to 10.
The water absorbent bulky composite spun yarn according to claim 1, which is 40% polyester staple fiber. 3. The water absorbent bulky composite spun yarn according to claim 1, wherein the twisting direction of the filament and the twisting direction of the staple fiber are opposite to each other.