JP2001295173A - Method for producing refreshing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for producing a refreshing material having both excellent air permeability and a high shadowing property. SOLUTION: This method for producing the refreshing material comprises weaving woven fabric from multifilament yarns comprising conjugate filaments formed of at least two kinds of polymers different in solubility and convertible into an ultrafine state of 0.02-0.50 dtex used as warp yarns and/or weft yarns and having 600-1,500 cover factor, then dissolving and removing a part of the readily soluble polymer of the conjugate filaments and producing ultrafine filaments. Furthermore, the removal ratio of the readily soluble component of the conjugate filaments is preferably 20-80 wt.% and the maximum fineness of the filaments formed of the conjugate filaments by the dissolving and removing treatment is preferably >=1 dtex. The multifilament yarns are preferably uneven yarns. Thereby, the refreshing material for clothes having high air permeability and shadowing effects and prevented from becoming transparent to the skin while preventing twining around the skin is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a cooling material for summer clothing.

[0002]

2. Description of the Related Art In recent years, consumer demands have been diversified,
As a material for clothing, there is an increasing demand for a soft material for summer, which has a so-called refreshing sensation that has little contact with the skin and has excellent moisture absorption and breathability, and is soft to the touch.

As a natural material, hemp fabric has been used for a long time in the midsummer, and it has a unique hemp to prevent clinging, and has a hygroscopic property of hemp to promote the absorption and diffusion of moisture such as sweat. It has the best performance and is still used in many products.

[0004] On the other hand, since synthetic fibers have poor hygroscopicity, some of them have been developed as clothing materials for midsummer, such as those having a water-absorbing property and those having an ultraviolet cut function. It is far from natural fiber as a typical summer refreshing material. Therefore, in order to obtain a refreshing sensation, a method of increasing the air permeability by using a woven fabric having a small covering factor, suppressing the rise in body temperature, and prompting the diffusion of moisture is generally adopted. However, this method has a drawback that when the eyes are coarsened to increase the refreshing feeling, the skin and underwear can be seen through.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for producing a cooling material having both air permeability and shielding properties.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to provide a multifilament yarn comprising a composite fiber formed from at least two polymers having different solubilities and capable of being finely reduced to 0.02 to 0.50 dtex. Is used for the warp and / or the weft, and woven into a woven fabric having a cover factor of 600 to 1500, and then a part of the easily soluble polymer of the conjugate fiber is dissolved and removed to generate an ultrafine fiber.
Achieved. Further, it is desirable that the removal rate of the easily soluble component of the conjugate fiber is 20 to 80% by weight, and that a fiber having a fineness of 1 dtex or more is partially formed from the conjugate fiber by the dissolution removal treatment. Further, it is desirable that the multifilament yarn is a mottled yarn.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
As the ultrafine conjugate fiber used in the present invention, two or three or more polymers having different solubilities that can partially generate an ultrafine fiber by being partially dissolved in an alkaline solution, an acidic solution, an organic solvent or hot water are used. It was what was. Of these, the components that you want to dissolve as soon as possible
When the other component to be left is a hardly soluble component, the easily soluble component dissolves at a speed 1.5 times or more faster, and even if the easily soluble component is completely dissolved, the hardly soluble component retains the fiber shape, It is preferable that the material has an appropriate high elongation. In addition, a combination with a dissolving agent that can dissolve only the easily soluble component without the hardly soluble component becoming an insoluble component without dissolving at all is also preferable. Further, as long as the hardly soluble component satisfies the above-mentioned relationship with the easily soluble component, not only one kind but also a plurality of hardly soluble components may be used. This is also true for easily soluble components, and a plurality of components may be used instead of one.

Examples of the combination of the hardly soluble component / the easily soluble component include polyester / polyamide and polyester /
Examples include polyolefin, polyamide / polyolefin, modified polyester obtained by copolymerizing or blending polyester / third component, and modified polyamide obtained by copolymerizing or blending polyamide / third component. Further, a combination in which the hardly soluble component and the easily soluble component are not easily peeled off is desirable so that all the composite fibers do not become ultrafine fibers after dissolution and removal. Preferably, for example, in the case of dissolving and removing with an alkaline solution, a polyester that is relatively easy to be spun as a hardly soluble component, a polyalkylene glycol residue or a dicarboxylic acid residue having a sulfonic acid metal salt in a side chain as a readily soluble component. And a modified polyester obtained by copolymerizing or blending the third component.

The form of the composite of the easily soluble component and the hardly soluble component of the fiber-forming polymer component may be any of a radiation type, a sea-island type, and a parallel type, and is not particularly limited. Examples of the cross-sectional view include a sea-island composite fiber as shown in FIG. 2 and a radial composite fiber as shown in FIG. FIG. 2 shows a sea component (1) which is an easily soluble component, an island component (2) which is a hardly soluble component, and FIG. 3 shows an easily soluble component (3) and a hardly soluble component (4).

[0010] Further, if ultrafine fibers are generated, the ratio of the easily soluble component to the hardly soluble component is not particularly limited. However, the ratio of the conjugate fiber in the multifilament yarn is high, and particularly when only the conjugate fiber is used, the weight ratio of the easily soluble component: the hardly soluble component is in the range of 10:90 to 50:50, and furthermore, The range of 20:80 to 40:60 is preferred. If the amount of the easily soluble component is 10% by weight or less, the amount of the soluble component is small, and the removal rate of the easily soluble component in the dissolution removal treatment step tends to be uneven, so that the control tends to be difficult. On the other hand, when the amount of the easily soluble component is 50% by weight or more, the removal rate can be easily adjusted, but in order to generate ultrafine fibers, the amount of the component to be dissolved increases and the efficiency is poor. In addition, when there are many easily soluble components, there is a tendency that the degree of dissolution and removal between the ultrafine fibers located in the surface layer and the ultrafine fibers located in the center tends to be significantly different depending on the type of the dissolving agent. The ultrafine fibers in the surface layer having a high degree of strength cause a decrease in strength and tend to easily fall off the material.

Furthermore, the minimum fine fiber fineness generated after the dissolution removal treatment in the present invention is 0.02 to 0.50 dtex.
It is necessary to be. More preferably 0.04 to
A range of 0.30 dtex is preferred. 0.50dtex
If it is larger, the disturbance of the ultrafine fibers hardly occurs, and the effect of shielding the voids is weakened. On the other hand, when it is smaller than 0.02 dtex, although the shielding property is good, the strength of the ultrafine fibers is weak, and there are too many dropped-off fibers as a high-summer garment to be washed in a short cycle. In addition, since there are many dropped-off fibers, the shielding effect in the voids is weakened over time. The fineness of the composite fiber before the dissolution removal treatment is not particularly limited,
1 to 15 dtex, more preferably 2 to 10 dtex, is preferred.

As a method for spinning the conjugate fiber, a conventionally known method can be arbitrarily adopted. For example, using a spinneret having a plurality of polymer introduction portions, at least two
Polymers with different solubilities are introduced into the spinneret from different polymer inlets, combined with easily soluble components so that hardly soluble components can be separated into ultrafine fibers, and then discharged from the same discharge hole. And take it up.

In the present invention, a multifilament yarn containing the above-mentioned ultrafine conjugate fiber is used. A mixture of ordinary fibers and composite fibers made of a single polymer may be used,
A multifilament yarn consisting of only conjugate fibers may be used. It is preferable to mix a fiber having a fineness of 1 dtex or more, preferably 2 dtex or more in order to harden the multifilament yarn. It is possible to prevent the multifilament yarn from becoming too soft by increasing the single yarn fineness. Further, in order to obtain a firmness that does not stick to the skin as a refreshing material, the total fineness of the multifilament yarn is preferably 30 to 300 dtex, and more preferably 50 to 250 dtex. If the total fineness is low, the skin becomes too soft and tends to cling to the skin.

Further, by using the multifilament yarn as a mottled yarn (thick and thin yarn), a refreshing feeling can be increased. The thickness ratio of the single fiber is preferably 1.2 to 5 times, more preferably 1.5 to 3 times. If it is less than 1.2 times, the effect of the plaque is small. If it is more than 5 times, the thick portion and the small portion are each likely to be distributed intensively, so that the size of the void portion of the fabric becomes uneven, and the distribution of the ultrafine fibers after the dissolution removal treatment is also likely to be uneven. There is a tendency. U% representing the fineness unevenness is preferably 1.5% to 12%, more preferably 2 to 7%.
It is. If it is less than 1.5%, it is difficult to distinguish between the plaque and the ordinary yarn, and the dispersion of the ultrafine fibers is reduced, and the shielding effect is weakened. On the other hand, if it is larger than 12%, the dispersion of the ultrafine fibers becomes more uneven, and the quality of the woven product tends to decrease.

[0015] Such a mottled yarn is obtained, for example, by multiply spinning a polymer having a different solubility and winding it up with a winder, by mottle stretching between the rollers via a plurality of rollers upstream of the winder. can get. Also,
After winding once, it can also be obtained by spot stretching using another stretching machine.

In the present invention, the multifilament yarn is used for warp and / or weft, preferably for both warp and weaving with 100% use. At this time, the multifilament yarn is twisted at 200 to 3000 turns / m. When twisting is severe, the dissolution and removal at the central part of the multifilament yarn are suppressed, and the ultrafine fibers are hardly dispersed, and the effect of the present invention tends to be hardly obtained. In addition, when the twist is sweet, the finished woven fabric becomes flat and soft, and the refreshing feeling tends to decrease.

The total cover factor of the woven fabric must be in the range of 600 to 1500. If the total cover factor is smaller than 600, even if the method of the present invention is employed, the fabric cannot be completely shielded and the gap between the fabrics is large, so that the skin can be seen through. On the other hand, if it is larger than 1500, the shielding effect is large, but the air permeability is reduced, and it cannot be used as a material for midsummer.

However, the calculation method of the total cover factor (TCF) in the present invention is as follows. CF = density × √ (yarn fineness · 9/10) (the unit of yarn fineness is dtex) Density = number of warps or wefts / (2.54 cm) TCF = warp CF + weft CF

Next, the easily soluble component of the conjugate fiber in the woven fabric is dissolved and removed to make it ultrafine. In the present invention, an ultrafine fiber having a single fiber fineness of 0.02 to 0.50 dtex is generated from a part of the conjugate fiber. It is important that some of the undissolved parts remain. Furthermore, it is preferable that the maximum fineness of the portion of the fiber formed from the conjugate fiber where the dissolution has not progressed due to the dissolving and removing process of the easily soluble component is 1 dtex or more. This is obtained because the fineness of the conjugate fiber before the dissolution removal treatment is large, and after the dissolution removal treatment, a part of the large fineness fiber remains in a part of the center portion of the multifilament yarn or the like. The undissolved portion that is not the ultrafine fiber in the multifilament yarn is distributed in the length direction of the multifilament yarn, so that the ultrafine fiber is fixed by the undissolved portion, and in addition to the twisting effect, It is regulated that it is unraveled. Further, the distribution of the fine fibers is uneven, and the texture and the refreshing feeling are excellent as hemp.

In order to increase the rigidity of the warp or weft, it is preferable to use a composite fiber in which a fiber having a fineness of 1 dtex or more is partially formed by a dissolution removal treatment.
In addition, multifilament yarns may contain ordinary fibers of 1 dtex or more that are not ultrafine by the treatment. However, in the case of the same fineness, a thick fiber derived from a conjugate fiber having an irregular cross-section or a fiber in the middle of dissolving and removing easily soluble components is more effective for rigidity than a fiber having a generally round cross-section. .

In the woven fabric after the dissolution removal treatment as described above,
In addition to ultrafine fibers, fibers with thick fineness and 1 dte
In the case of using a multifilament yarn having fibers having a fineness of x or more, the stiffness of the warp and the weft is increased, and the fabric structure is less likely to collapse. For this reason, when the dyeing process is at the level of the firs, the fibers are hardly disturbed, the interval between the warps and wefts can be sufficiently maintained, and the deformation and bending hardness of the woven fabric can be kept at an appropriate level. As a result, it does not cling to the human body like hemp,
The gap between the skin and the fabric is kept moderate, and the effect of increasing the air permeability is created. In the present invention, by maintaining the inter-fiber gap without breaking the woven fabric structure, the light shielding effect by the ultrafine fibers is obtained while ensuring the air permeability.

In the present invention, in order to obtain a fiber in which the ultrafine fibers are present and the easily soluble component and the hardly soluble component are partially unseparated, the processing conditions under which the easily soluble component of the conjugate fiber is dissolved in the middle stage. adopt. At that time, the removal rate of easily soluble components of the conjugate fiber by the dissolution removal treatment is 20 to 80% by weight, particularly 40% by weight.
Conditions that are in the range of ６０60% by weight are preferred. in this case,
In some parts, the easily soluble components of the conjugate fiber are completely dissolved and removed, leaving only the ultra-fine fibers of the hardly soluble components, and in other parts, only part of the conjugate fibers are removed, and the removal of the ultra-fine fibers and the easily soluble components is in progress. The conjugate fiber is mixed with the conjugate fiber, and most of the easily soluble components are not removed in other portions, and the conjugate fiber maintains the fineness as it is.

The portion of the conjugate fiber where the easily dissolvable portion is hardly removed is a portion of the dissolving liquid such as a crossing portion between the warp and the weft in the woven fabric and a central portion of the multifilament yarn where the single fibers are converged by the twist. Occurs frequently where penetration is not sufficient. On the other hand, in the surface layer portion of the woven fabric in which the easily soluble component is liable to be removed, even if the removal rate of the easily soluble component in the entire woven fabric is low, most of the composite fibers form ultrafine fibers. In the intermediate region, only a part of the conjugate fiber is removed, and the ultrafine fiber and the conjugate fiber whose removal of easily soluble components is in progress are mixed. Thus, it is preferable that the three different forms are mixed on the woven fabric. If all fibers are microfibers,
In the woven fabric having a small cover factor as in the present invention, the woven fabric structure is easily collapsed on the soft side, and the voids between the multifilament yarns are easily filled with the ultrafine fibers, so that the air permeability decreases, the warm feeling increases, and the refreshing feeling decreases. .

The specific method of the dissolution removal treatment is, for example, as follows. Using a dyeing machine, a woven fabric obtained from a conjugate fiber made of a modified polyester obtained by copolymerizing a polyester as a hardly soluble component and a third component which can be easily dissolved and removed with an alkaline solution as an easily soluble component, and using a dyeing machine to remove the fabric with hot water. After performing a normal pre-setting process to remove wrinkles, perform a wrinkle removal process, and then use an alkali solution having an appropriate concentration of caustic soda as a dissolution solution, and reduce the alkali as a dissolution removal process. There is a method of implementing. Alternatively, a method of performing a weight reduction process as a dissolving and removing process may be adopted, which is continuous with the step of removing and dirting before the presetting. At this time, the removal rate of the easily soluble component is 20 without dissolving and removing the entire amount of the easily soluble component.
It is advisable to adjust the weight loss rate of the fabric so as to be ~ 80% by weight.

The cooling material obtained by the production method of the present invention obtained as described above has both air permeability and shielding property that the skin is hardly transparent due to the appropriate dispersion of ultrafine fibers in the gaps between the multifilament yarns. This material is excellent as a material for midsummer with little clinging to.

[0026]

The cooling material of the present invention increases the air permeability by reducing the cover factor of the woven fabric and increasing the fiber void of the warp. In the case of ordinary woven fabrics, roughening of the woven fabric voids was a cause of sheer in order to increase air permeability, but in the present invention, as a method of preventing sheer, which is inconsistent with aeration, a space between multifilament yarns of warp yarns is used. Is covered with a single fiber that has been dissolved and removed after the weaving process and has been made finer, thereby achieving both ventilation and prevention of see-through.

As shown in FIG. 4, immediately after weaving, as shown in FIG. 4, there are large voids (5) between the multifilament yarns, and the air permeability is high but the see-through is large. Incidentally, FIG. 4 shows that, for example, after weaving a warp in which a plurality of single fibers of sea-island type microfine composite fibers are collected and a weft in which a plurality of single fibers of sea-island type microfine composite fibers are collected, glue and dirt are removed in a scouring process. In an enlarged view of the surface of the woven fabric after dropping and pre-setting for wrinkle removal, a multifilament yarn (6),
The multifilament yarn interstices (5) and the single fibers (7) before the dissolution removal treatment. The single fiber (7) here is
In addition to composite fibers that can be made ultrafine, ordinary fibers that do not become ultrafine fibers are included.

Next, after a part of the easily soluble component is dissolved and removed for the formation of ultrafine fibers, the ultrafine fibers (8) are dispersed as shown in FIG. It is located in the gap (5a) and appropriately shields the gap. Moreover, unlike the shielding by the thick fiber, the shielding by the ultrafine fiber (8) has the thinning of the ultrafine fiber, good air permeability,
It works to reduce the light like haze, so that even if the weave density of the multifilament yarn is low, the effect of preventing the skin from being seen through is brought about. This is because the ultra-fine fibers dispersed in the fiber voids are thin and can shield the light in the voids and allow sufficient air to pass therethrough. Furthermore, the microfibers (8) are ultrafine and moderately dispersed, so that they do not have a hemp-like ruffled feel and feel good, yet they do not converge densely, so there is no slimy feeling or warmth that is often associated with using microfibers. In addition, there is also an effect of absorbing moisture such as sweat on the skin surface by the capillary action of the ultrafine fibers, so that the material is comfortable as a material for midsummer and has a water absorbing function.

Here, FIG. 1 shows, for example, an enlarged portion of the woven fabric surface which has been subjected to a weight reduction process as a dissolving and removing treatment for the woven fabric of FIG. The figure shows the dispersion state of single fibers (7a), voids (5a), and ultrafine fibers (8), which are hardly soluble components, of ordinary fibers and composite fibers that are not ultrafine even after the dissolution removal treatment. FIG. 5 is an enlarged view of the AA ′ cross section of FIG. 1 and shows the presence of non-fine single fibers (7a) and superfine fibers (8) in the surface layer, which are located in the tissue. The presence state of the single fiber (7a) and the microfiber (8) of the weft crossing the warp is shown.

Further, the effect of the present invention is remarkable when the multifilament yarn is mottled yarn. For example, when dissolving and dissolving components dissolve easily soluble components into ultrafine fibers of only the hardly soluble components, the ultrafine fibers are released from tension and restraint. The degree of freedom of the movement of the ultrafine fibers is increased by the mixture of. In addition to a rare effect in a bath such as a dyeing process, the fine fibers are not converged at one place, and the appropriate dispersion in the fiber voids is further promoted.

[0031]

The present invention will now be described in more detail with reference to Examples and Comparative Examples, which by no means limit the present invention.
The measured values in the examples and comparative examples were obtained according to the following methods. (1) U% (fineness unevenness) Worcester U% measuring device (UST
Using ER TESTER-3), the measurement is performed under normal conditions, a chart speed of 8 m / min, a chart range of 25%, and a measurement time of 5 minutes. (2) Thickness ratio An ultra-fine multifilament drawn yarn having a single spot collected at random is embedded in paraffin, a section is prepared with a microtome, and the slice is attached to a slide glass, and then the paraffin is dissolved. The smallest and largest diameters are read while observing the cross section remaining in the microscope with a microscope equipped with a measure. Repeat this work 5 times in total,
The minimum diameter and the maximum diameter are selected and expressed as maximum diameter / minimum diameter.

Example 1 Polymer A was a polyethylene compound having a number average molecular weight of 150,000% (composed of a phthalic acid residue and a polyoxyethylene glycol residue having a number average molecular weight of 20,000) of 4% by weight and a molecular weight of 20,000. Polyethylene terephthalate (intrinsic viscosity: 0.63, melting point: 253 ° C.) containing 4% by weight of glycol and 0.8% by weight of an alkylsulfonic acid sodium salt (the alkyl group is an aliphatic alkyl group having an average of 14 carbon atoms). . On the other hand, the polymer B was polyethylene terephthalate having an intrinsic viscosity of 0.64. The polymer A and the polymer B are discharged from the same discharge hole at a weight ratio of 40:60, and the polymer B forms a cross-section in which 37 islands are formed in the polymer A. FIG. ) Was spun and wound at a speed of 3000 m / min. The resulting ultrafine composite multifilament yarn had an elongation of 150% of 100 denier / 24 filament.

This ultra-fine composite multifilament yarn is drawn at a heating roller of 65 ° C., a drawing roller of 120 ° C. and a draw ratio of 1.3, and a 78% denier / 24 filament U% (density of fineness) of 5% and a thickness / thinness ratio of 2.5 Was obtained.

The mottled yarn of this ultra-fine composite multifilament yarn was twisted at 300 turns / m, and woven in a flat structure using warp and weft. The total cover factor during weaving is 800
Met. After scouring at 70 ° C. in the dyeing process, the pre-set temperature was set at 180 ° C. for 45 seconds, and the weight was reduced by 20% by weight in a 35 g / l caustic soda solution heated to 98 ° C. (removal rate of easily soluble components: 50%). %)
After neutralization and washing, and subsequently staining with a staining solution at 130 ° C. for 45 minutes, air-drying, and then final setting at 170 ° C.
For 45 seconds to finish the product. The microfibers were distributed on the surface of the woven fabric, and the skin did not penetrate through the voids of the woven fabric, and had an appropriate air permeability. The hardness of the woven fabric is also hemp-like due to partial weight loss, while the touch is comfortable, yet it has a strong cooling sensation with no stickiness at all.

Comparative Example 1 A product was finished through exactly the same method and process as in Example 1 except that the weight loss rate was 40% by weight (corresponding to 100% by weight of the easily soluble component removal rate). Although the product was thin, the voids of the woven fabric were covered with microfibers and the shielding effect was high, but it was damp and inferior in coolness as a material for midsummer.

Example 2 The ultrafine composite multifilament yarn spun in Example 1 was drawn at a heating roller of 85 ° C., a drawing roller of 120 ° C. and a draw ratio of 1.6, U% 0.8%, and thickness ratio 1. 1. 63 dale / 24 filament. This ultrafine composite multifilament yarn was finished from the twisted yarn to the final product under the same conditions as in Example 1. Although the obtained product had a little dispersion of ultrafine fibers, it had high air permeability and was prevented from being rid of skin due to a shielding effect, and thus was preferable as a refreshing material.

[Comparative Example 2] The same weaving process was performed by using the same yarn as that obtained in Example 1 except that the number of driving was increased, and only the total cover factor was 200.
A woven fabric changed to 0 was made. Thereafter, the same final dyeing process as in Example 1 was performed to finish the final product. As a result, in the obtained material, most of the voids were closed by dispersion of the ultrafine fibers, and there were almost no voids in the woven fabric.

[0038]

According to the method for producing a refreshing material of the present invention, there is provided a refreshing material for clothing which has a high air-permeable property, prevents clinging to the skin, has a high shielding effect and prevents the skin from being transparent.

[Brief description of the drawings]

FIG. 1 is an enlarged view of the fabric surface of the present invention with improved coolability.

FIG. 2 is a cross-sectional view of the sea-island composite fiber used in the present invention.

FIG. 3 is a cross-sectional view of a radial composite fiber used in the present invention.

FIG. 4 is an enlarged view of the fabric surface of the present invention before the dissolution removal treatment.

FIG. 5 is an enlarged view of a cross section taken along the line A-A ′ of the woven fabric of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 The sea component which is a soluble component of the sea-island composite fiber 2 The island component which is a hardly soluble component of the sea-island composite fiber 3 The easily soluble component of the radiation type composite fiber 4 The hardly soluble component of the radiation type composite fiber 5 Multifilament immediately after weaving Inter-gap space 5a Multi-filament inter-gap space after dissolution removal treatment 6 Multi-filament yarn 7 Single fiber before dissolution removal treatment 7a Non-fine single fiber after dissolution removal treatment 8a Ultrafine fiber after dissolution removal treatment

Continued on the front page (72) Inventor Masayuki Hayashi 77-77 Kitayoshida-cho, Matsuyama-shi, Ehime F-term in Teijin Limited Matsuyama Office (reference) 4L031 AA18 AB08 AB11 AB21 AB32 BA11 CA01 DA01 4L041 AA08 AA20 BA04 BA05 BA09 BA11 BA16 BA52 BD14 BD20 CA06 CA16 DD01 DD11 DD14 EE06 EE07 EE15 4L048 AA20 AA29 AA30 AA36 AA46 AB07 AB12 AC19 BA01 BA02 CA11 CA15 DA01 EB04 EB05

Claims (7)

[Claims] 1. A multifilament yarn formed from at least two polymers having different solubilities and comprising a conjugate fiber which can be ultrafinely reduced to 0.02 to 0.50 dtex is used for a warp and / or a weft. , Cover factor is 60
A method for producing a cooling material, comprising weaving into a woven fabric of 0 to 1500, and then dissolving and removing a part of the easily soluble polymer of the conjugate fiber to produce an ultrafine fiber. 2. The removal rate of easily soluble components of the conjugate fiber is 20 to 20.
The method for producing a cooling material according to claim 1, wherein the amount is 80% by weight. 3. A method for dissolving and removing 1 from the composite fiber.
A fiber having a fineness of dtex or more is partially formed.
Or the method for producing a cooling material according to 2. 4. The method according to claim 1, wherein the conjugate fiber is a sea-island conjugate fiber or a radial conjugate fiber. 5. The method according to claim 1, wherein the multifilament yarn is 30 to 30.
The method for producing a cooling material according to any one of claims 1 to 4, wherein the cooling material is 0 dtex. 6. The multifilament yarn has a fineness of 1 dt.
ex or fibers comprising a single polymer.
6. The method for producing a cooling material according to any one of the above items 5. 7. The method for producing a cooling material according to claim 1, wherein the multifilament yarn is a mottled yarn.