JP2011068011A - Composite fabric for cool feeling material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composite fabric for cool feeling material having a cooling effect. <P>SOLUTION: The composite fabric for cool feeling material is made by laminating a nanofiber nonwoven fabric comprising fiber having a diameter of 50 nm or more and less than 2.5 μm, and at least one layer of knitted texture on each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a composite fabric for cooling material composed of a nanofiber nonwoven fabric and a knitted fabric.

  In recent years, in clothing, particularly sports clothing, underwear, and the like, fabrics that suppress a hot feeling in summer and are excellent in a cool contact feeling have been provided. As such a fabric, for example, a fabric using a fiber excellent in contact cooling obtained by a method of improving the water absorption of the fiber or improving the thermal conductivity of the fiber is known. However, in the fabric, when a sensory test was actually performed by humans, there was almost no difference from the untreated fabric, and it was not possible to realize a cold feeling of contact.

  By the way, Patent Document 1 discloses a composite fabric composed of a nanofiber nonwoven fabric and a knitted fabric. According to Patent Document 1, a comfortable composite fabric having moderate moisture permeability while suppressing air permeability can be provided, but no consideration has been given to using the fabric as a cooling sensation material.

JP 2009-191435 A

  The main object of the present invention is to provide a composite fabric for a cooling material having a cooling effect.

  As a result of intensive studies to solve the above problems, the present inventors have found that a cooling effect can be obtained by superimposing a nanofiber nonwoven fabric and a knitted fabric. The present invention has been completed as a result of further studies based on these findings.

The present invention provides the following composite fabric for cooling material.
Item 1. A composite fabric for cooling sensation material, in which a nanofiber nonwoven fabric composed of fibers having a diameter of 50 nm or more and less than 2.5 μm and at least one layer of knitted fabric are laminated.
Item 2. The composite fabric for cooling sensation material according to Item 1, wherein the nanofiber nonwoven fabric is laminated on the knitted fabric through an adhesive.
Item 3. Item 3. The composite fabric for cooling sensation material according to Item 1 or 2, wherein the knitted fabric is a mesh-shaped knitted fabric.
Item 4. Item 4. The composite fabric according to any one of Items 1 to 3, wherein the adhesive is a mesh heat-sealing film.
Item 5. Item 3. The composite fabric for cooling sensation material according to Item 2, wherein the composite fabric is a nanofiber nonwoven fabric composed of fibers having a diameter of 50 nm or more and less than 2.5 μm, an adhesive layer and a knitted fabric.
Item 6. The cooling sensation material which consists of a composite fabric in any one of said items 1-5.

  ADVANTAGE OF THE INVENTION According to this invention, the composite fabric for cooling materials which has a cooling effect can be provided.

It is a knitting | organization organization chart of the knitted fabric used in the Example. It is a knitting | organization organization chart of the knitted fabric used in the Example. It is a cross-sectional scanning electron microscope (SEM) photograph (300 times) of the composite fabric of Example 1. It is the result of the contact cool feeling test measured from the nanofiber nonwoven fabric side of the composite fabric of Example 1. It is a result of the heat of vaporization test of the composite fabric of Example 1.

1. Composite fabric for cooling sensation material The composite fabric for cooling sensation material of the present invention is formed by laminating a nanofiber nonwoven fabric made of fibers having a diameter of 50 nm or more and less than 2.5 μm and at least one knitted fabric. The configuration of the present invention will be described in detail below.

(1) Nanofiber nonwoven fabric The diameter of the nanofiber constituting the nanofiber nonwoven fabric used in the present invention is 50 nm or more and less than 2.5 μm, preferably 100 nm to 2.2 μm, more preferably 500 nm to 2.0 μm. is there. Here, the diameter of the nanofiber was photographed with a scanning electron microscope (SEM), magnification: 10,000 to 50,000 times, and the thickness of the randomly selected fiber (fiber axis perpendicular) The diameter of the direction cross section) is measured at 30 points, and is represented by the average value.

  The material of the nanofiber is not particularly limited as long as it is a material having an elongation enough to follow the stretchability of the knitted fabric, and a conventionally known material can be used. Specific examples include polyurethane (for example, spandex), elastomeric polymer (for example, thermoplastic elastomer fiber such as urethane-based elastomer, polyester-based elastomer, and polyamide-based elastomer). Among these, polyurethane and urethane-based elastomer are preferable from the viewpoint that the obtained composite fabric is excellent in cooling sensitivity. A water-absorbing or moisture-permeable polyurethane resin can also be suitably used.

Basis weight of the nanofiber nonwoven fabric is preferably less than 300 g / ^{m 2,} more preferably from 4~200g / ^{m 2,} further preferably 4~50g / ^{m 2.} The basis weight is a value obtained by measuring the weight of a 10 cm × 10 cm sample and calculating the weight per unit area. It is preferable to use a nanofiber nonwoven fabric having such a weight per unit area because an appropriate amount of water retention contributing to vaporization can be maintained, so that a cooling effect is high and flexibility and strength following the stretch deformation of the fabric can be exhibited. If it is 300 g / m ² or more, the cooling efficiency tends to decrease, and if it is less than 4 g / m ² , the strength and the ability to follow elastic deformation tend to deteriorate.

  The total thickness of the nanofiber nonwoven fabric used in the present invention is preferably 5 to 300 μm, and more preferably 10 to 200 μm. The total thickness of the nanofiber nonwoven fabric is a value measured with a dial thickness gauge H-0.4N (manufactured by Ozaki Mfg. Co., Ltd.). In addition, the thickness of the nanofiber nonwoven fabric in the Example mentioned later is also based on the said measuring method.

  Although the manufacturing method of the nanofiber nonwoven fabric used in this invention is not specifically limited, It is preferable to form by the electrospinning method (ElectroSpinning Deposition (ESD)). The electrospinning method will be described later.

(2) Knitted fabric The composite fabric of the present invention has a form in which at least one layer of knitted fabric is laminated on a nanofiber nonwoven fabric. From the point that a higher cooling effect can be obtained, a form in which the knitted fabric is laminated on one surface of the nanofiber nonwoven fabric is preferable, and in particular, two layers of the knitted fabric and the nanofiber nonwoven fabric (three layers when an adhesive layer is interposed) ) Is preferred. In the composite fabric of the present invention, an excellent cooling feeling can be obtained by using the surface made of the nanofiber nonwoven fabric so as to contact the skin. Therefore, as described above, it is preferable that one side of the composite fabric is a nanofiber nonwoven fabric side.

  In addition, when laminating the nanofiber nonwoven fabric and the knitted fabric, it is preferable to laminate the nanofiber nonwoven fabric and the knitted fabric via an adhesive (or adhesive layer) from the viewpoint of the strength of the resulting composite fabric.

  The material constituting the knitted fabric may be a hydrophilic material or a hydrophobic material, or a combination thereof may constitute the knitted fabric.

  As the hydrophilic material, a conventionally known material can be used. For example, cotton (official moisture content: 8.5%), hemp (official moisture content: 12.0%), silk (official moisture content: And natural fibers such as animal fibers such as wool (official moisture content: 15.0%). Among these, cotton and wool are preferable from the viewpoints of touch and heat retention. Also, cupra (official moisture content: 11.0%), rayon (official moisture content: 11.0%), polynosic (official moisture content: 11.0%), acetate (official moisture content: 6.5%), Regenerated fibers such as triacetate (official moisture content: 3.5%) and lyocell can also be used. In addition, acrylic (official moisture content: 2%), polyclar (registered trademark) (official moisture content: 3.0%), Promix (registered trademark) (official moisture content: 5.0%); nylon-6, nylon Polyamides (official moisture content 4.5%) such as nylon fibers such as -66 can be suitably used, and vinylon (official moisture content: 5.0%) can also be exemplified. These materials can be used alone or in combination of two or more.

  As the hydrophobic material, conventionally known materials can be appropriately selected. For example, polyethylene terephthalate (PET), polyester (official moisture content: 0.4%); polyvinyl chloride (official moisture content: 0.0 Polyvinylidene chloride (official moisture content: 0.0%); Polyurethanes such as spandex (official moisture content: 1.0%); Polyolefins such as polypropylene; Styrene elastomers, olefin elastomers, urethane elastomers, chlorides Examples thereof include thermoplastic elastomer fibers such as vinyl elastomers, polyester elastomers, polyamide elastomers (official moisture content 0.9%), and fluorine fibers (official moisture content: 0%). In the present invention, these materials can be used alone or in combination of two or more.

  Among the above materials, polyester, cupra / polyester, and polyamide elastomer are preferable because a high cooling effect can be obtained.

  The knitted fabric used in the present invention preferably contains a material having an official moisture content of 0.0 to 1.9%, and the content is preferably 50% by weight or more based on the total weight of the knitted fabric, More preferably, it is 60-100 weight%, It is more preferable that it is 65-100 weight%, It is especially preferable that it is 70-100 weight%.

  Moreover, it is preferable that the material whose official moisture content is 2.0 to 15% is less than 30% by weight with respect to the total weight of the knitted fabric.

  The knitted fabric used in the present invention has a total fineness of usually 50 dtex or more, preferably 60 to 300 dtex, more preferably 70 to 200 dtex. Within such a range, the strength of the composite fabric of the present invention can be maintained.

  These knitted fabrics are not particularly limited in terms of tissue type (type of knitting method), fiber length (filament (long fiber), staple (short fiber)), etc., but it is preferable that the fabric be as thin and light as possible. Further, in the present invention, in order to promote the movement of moisture by vaporization from the skin side to the outside air, the moisture movement by capillary action and the moisture movement by direct vaporization from the pores of the nanofiber layer function synergistically. And it is preferable that it is a mesh-like knitted fabric. Examples of the mesh shape include a milled mesh structure and a tack mesh structure, and can be knitted according to a conventional method. Further, for example, a flat knitting structure composed of weft knitting and circular knitting, a rubber knitting structure, a double-sided knitting structure and the like can be suitably employed in the present invention. These structures can also be knitted according to a conventionally known method. Further, a structure based on rubber knitting or the like can be adopted, and examples thereof include a structure (sinter knitted) manufactured by the method described in Japanese Patent Application Laid-Open No. 2004-036051. For example, using a circular knitting machine suitable for a knitted structure, the yarn length and loop length, yarn feeding tension, fabric tension, etc. can be set and knitted within the range of 16 to 40 G gauge.

  In the composite fabric of the present invention, the total thickness of the knitted fabric is usually 100 to 1,200 μm, preferably 200 to 1,100 μm, more preferably 200 to 1,000 μm.

(3) Adhesive In the composite fabric of the present invention, the nanofiber nonwoven fabric and the knitted fabric are preferably laminated via an adhesive. This is because the nanofiber nonwoven fabric and the knitted fabric are firmly bonded to each other through the adhesive, and a composite fabric having high strength can be obtained.

  The adhesive used in the present invention is not particularly limited as long as the nanofiber nonwoven fabric and the knitted fabric can be bonded together, and conventionally known materials can be used as long as the effects of the present invention are not impaired. However, when adhering the nanofiber nonwoven fabric and the knitted fabric, if the pores of the nanofiber nonwoven fabric are blocked, the moisture permeability may be impaired. For example, a mesh-like heat fusion film, a nonwoven-like heat fusion film, etc. It is preferable to adopt a method of spraying a hot press, a highly moisture-permeable adhesive, or the like. Alternatively, an adhesive may be applied between the nanofiber nonwoven fabric and the knitted fabric, and a method such as point bonding (dot bonding) may be used.

  Examples of the material of the heat-sealing film include polyamide-based, polyester-based, butadiene rubber-based, polyurethane-based, and the like, and polyurethane is particularly preferable from the viewpoint of adhesiveness and stretchability. Specifically, for example, as a urethane-based heat fusion film, Tokai Thermo Co., Ltd. FUSEC C6J5, and as a polyamide-based heat fusion nonwoven fabric, Tokai Thermo Co., Ltd. FUSEC 1G8 D8 can be mentioned. Not. When using a heat sealing film, an adhesive layer is formed between the nanofiber nonwoven fabric and the knitted fabric. Moreover, as a highly moisture-permeable adhesive agent, the polyurethane etc. which introduce | transduced the hydrophilic group are mentioned, for example.

The amount of the adhesive used is not particularly limited as long as it can sufficiently bond the knitted fabric and the nanofiber nonwoven fabric, but in order not to impair the texture of the composite fabric, the basis weight is preferably 5 to 100 g / m ² , more Preferably it is 8-30 g / m < ² >.

  Since the composite fabric for cooling sensation material of the present invention has a high cooling effect, it is useful as a cooling sensation material. Here, examples of the cold sensation material include materials such as a cooling patch and the like, and cold sensation underwear (preferably sportswear).

  Specifically, it can be used as a cooling agent for hot flashes, an emergency coolant for bruises and sprains, and an analgesic / sedative aid for muscle pain. In addition, examples of clothes, particularly cool underwear (preferably sportswear) include shirts, briefs, stomach wraps, steco, patches, shorts, girdles, petticoats, leggings, socks, tights, and the like. When manufacturing underwear etc. using the composite fabric of this invention, what is necessary is just to follow a conventionally well-known method, and a cutting method, a sewing method, etc. are not specifically limited.

2. Production Method The production method of the composite fabric of the present invention is not particularly limited, but as described above, the nanofiber nonwoven fabric is preferably produced by an electrospinning method. Below, it describes about a manufacturing method.

(1) Manufacturing method of nanofiber nonwoven fabric The nanofiber nonwoven fabric used in the present invention is formed by electrospinning deposition (ESD) using a solution in which a material constituting the nanofiber nonwoven fabric is dissolved in a solvent. It is preferred that

  Examples of the solvent include N, N-dimethylformamide (DMF), tetrahydrofuran, dimethylacetamide, hexafluoroisopropanol, methyl ethyl ketone, copper ammonia aqueous solution, and the like. These may be used alone or in combination of two or more. Can do.

  Typical examples of production conditions in the electrospinning method include a voltage of −70 to 70 kV, a nozzle diameter of 14 to 32 G, and a distance of 5 to 30 cm from the nozzle tip to the collector. Moreover, although it changes suitably according to the polymer raw material used, for example, in the case of a polyurethane resin, it is desirable to dissolve in the solvent at a concentration of 3 to 40% by weight, preferably 5 to 30% by weight. When other polymer materials are used, conventionally known solvents suitable for various polymers can be used, and the dissolution concentration can be appropriately set with reference to the above concentration.

(2) Manufacturing method of composite fabric The manufacturing method of the composite fabric of the present invention includes a step of laminating a knitted fabric on one surface of the nanofiber nonwoven fabric described above. As the knitted fabric, those described above can be used.

  The method for adhering the nanofiber nonwoven fabric and the knitted fabric is not particularly limited, and a hot pressing method using a heat fusion film such as a mesh-like heat fusion film or a nonwoven-like heat fusion film, A method of spraying an adhesive such as a moisture permeable adhesive, a method of applying point adhesive (dot adhesion), etc. by applying some adhesive between the nanofiber nonwoven fabric and the sheet-shaped body can be employed. As the adhesive, those described above can be used as appropriate.

  Among these, the method of hot pressing using a heat fusion film is preferable.

  The hot press conditions are not particularly limited and can be appropriately changed depending on the type of the heat-sealing film to be used. For example, 100 to 180 ° C., 0.001 to 2 MPa, and 5 Hot pressing is preferably performed under conditions of about 2 to 1 minute.

  The total thickness of the composite fabric of the present invention obtained as described above is not particularly limited, but is preferably 100 to 1,220 μm, and more preferably 200 to 1,220 μm.

  EXAMPLES Hereinafter, although an Example is shown and this invention is demonstrated in detail, this invention is not limited to these.

  The nanofiber nonwoven fabric and knitted fabric used in the following examples were produced according to the following method.

Production Example 1 ( Manufacture of nanofiber nonwoven fabric made of urethane resin)
A thermoplastic polyurethane resin (urethane elastomer, trade name: Pandex 1185, manufactured by DIC Bayer Ltd.) was dissolved in DMF to obtain a 23 wt% DMF solution. This was filled in a solution filling portion of an electrospinning apparatus (ES-2300 (device name), manufactured by Huence Co., Ltd.) and subjected to electrospinning by applying a voltage of 55 kV to produce a nanofiber nonwoven fabric. The diameter of the metal nozzle used at this time was 26 G (inner diameter: 0.23 mm), and the distance to the collector was 15 cm. The obtained nanofiber nonwoven fabric had a thickness of 50 μm, a basis weight of 13.7 g / m ² , and an average fiber diameter of 1108 nm. Hereinafter, the nonwoven fabric obtained in Production Example 1 is referred to as a PU electrospun nonwoven fabric.

Production Example 2 ( Manufacture of nanofiber nonwoven fabric made of moisture-permeable urethane resin)
One-component polyether-based polyurethane resin solution (moisture-permeable polyurethane, trade name: Heimlen Y-210B, nonvolatile content 30%, manufactured by Dainichi Seika Kogyo Co., Ltd.) is mixed with DMF and MEK mixed solvent (1: 1 (volume ratio)) ) Was diluted so that the nonvolatile content would be 24% by weight, and this was filled in the solution filling part of the same electrospinning apparatus as described above, and electrospinning was performed by applying a voltage of 55 kV. The diameter of the metal nozzle used at this time was 21 G (inner diameter: 0.51 mm), and the distance to the collector was 15 cm. The obtained nanofiber nonwoven fabric had a thickness of 70 μm, a basis weight of 23.7 g / m ² , and an average fiber diameter of 1415 nm. Hereinafter, the nonwoven fabric obtained in Production Example 2 is referred to as a moisture-permeable PU electrospun nonwoven fabric.

Production Example 3 ( Manufacture of nanofiber nonwoven fabric made of nylon resin)
6 Nylon resin (average molecular weight: 30,000, manufactured by Ube Industries, Ltd.) was diluted with formic acid so that the non-volatile content would be 25% by weight, and this was added to the solution filling part of the same electrospinning apparatus as described above The nanofiber nonwoven fabric was manufactured by filling and performing electrospinning by applying a voltage of 40 kV. The diameter of the metal nozzle used at this time was 24G (inner diameter: 0.30 mm), and the distance to the collector was 26 cm. The obtained nanofiber nonwoven fabric had a thickness of 70 μm, a basis weight of 4.7 g / m ² , and an average fiber diameter of 925 nm. The nonwoven fabric obtained in Production Example 3 is hereinafter referred to as NY electrospun nonwoven fabric.

Production Example 4 ( Manufacture of nanofiber nonwoven fabric made of cellulose)
Cellulose fiber ARBOCEL BE600-10 (manufactured by RETTENMAIER) 5 parts by weight, copper hydroxide (chemical, manufactured by Kishida Chemical Co., Ltd.) 3 parts by weight, 28% ammonia water (special grade, manufactured by Kishida Chemical Co., Ltd.) 68 parts by weight Then, 24 parts by weight of distilled water was mixed at room temperature, and the cellulose fiber was dissolved to prepare a spinning solution having a cellulose concentration of 5% by weight. The spinning solution was filled in a solution filling portion of the same electrospinning apparatus as described above, and electrospinning was performed by applying a voltage of 60 kV to produce a nanofiber nonwoven fabric. The diameter of the metal nozzle used at this time was 21 G (inner diameter: 0.51 mm), and the distance to the collector was 25 cm. The obtained nanofiber nonwoven fabric had a thickness of 180 μm, a basis weight of 21.7 g / m ² , and an average fiber diameter of 644 nm. The nonwoven fabric obtained in Production Example 4 is referred to as a cellulose electrospun nonwoven fabric.

Production Example 5 ( Production of polyester mesh knitted fabric)
Using an 18G, 30-inch knitting machine, a circular knitted fabric was produced with the milled knitted fabric of FIG. A mesh knitted fabric of 100% polyester was obtained using all the 1-8 course yarns of polyester 84T72 (84 dtex, 72 filaments). The thickness of the 100% polyester mesh knitted fabric was 550 μm and the basis weight was 77 g / m ² .

  In the 8 course repeat, the transfer was made from the lower needle to the upper needle between the first course and the second course and between the fifth course and the sixth course.

Production Example 6 ( Production of polyester / cupra mixed mesh knitted fabric)
In the knitting structure shown in FIG. 2, 1st and 5th courses are made of polyester 84T72 (84dtex, 72 filaments), 2nd, 4th, 6th and 8th courses are SCY3384 (single covered yarn, 33dtex polyurethane with 84dtex polyester. 3rd and 7th course Skycool UP118T (manufactured by Asahi Kasei Fibers Co., Ltd., polyester (34 dtex, 18 filaments) and cupra (84 dtex, 54 filaments)) 118 dtex multifilament yarn use With a repeat of 8 courses, the transfer was transferred from the lower needle to the upper needle between the first course and the second course and between the fifth course and the sixth course. The composition of the obtained mesh knitted fabric was 73.7% polyester, 21.6% cupra, and 4.7% polyurethane.

The polyester / cupra mixed mesh knitted fabric had a thickness of 720 μm and a basis weight of 127.2 g / m ² .

Production Example 7 ( Production of polyamide elastomer sheet fabric)
With reference to the description in Japanese Patent Application Laid-Open No. 2005-36361, a polyamide elastomer manufactured by Atofina Japan, Pebax MV1041SA01 and Pebax 6333SA01 was melt-mixed at a weight ratio of 8: 2, and pellets of a resin mixture were prepared using a pelletizer. . 3 Polyamide elastomer multifilaments of 140 dtex, 34 filaments were obtained by melt spinning using the pellets. It is known that this fiber has an excellent contact cooling feeling.

A knitted fabric was produced with a plain sheet structure using a 28G knitting machine with one type of raw yarn obtained. The thickness of the polyamide elastomer sheet fabric was 750 μm and the basis weight was 181 g / m ² .

Production Example 8 ( Production of polyester sheet fabric)
A knitted fabric was produced with a plain tengu structure using a 28G knitting machine with one type of 64 dtex, 36 filament polyester multifilament yarn. The thickness of the polyester sheet fabric was 230 μm, and the basis weight was 63.1 g / m ² .

Example 1
Obtained in Production Example 5 using a mesh-type urethane-based heat-sealing film (FUSEC C6J5 manufactured by Tokai Thermo Co., Ltd .; basis weight 28 g / m ² ) on one surface of the nanofiber nonwoven fabric obtained in Production Example 1. Using a heat press machine (TABLE TYPE TEST PRESS SA-302, manufactured by Tester Sangyo Co., Ltd.), the obtained polyester mesh fabric was heat-sealed at 125 ° C., a press pressure of 0.003 MPa, and a press time of 17 seconds. Got composite fabric.

Example 2
A composite fabric was obtained in the same manner as in Example 1 except that the nanofiber nonwoven fabric was changed to the moisture-permeable PU electrospun nonwoven fabric obtained in Production Example 2.

Example 3
A composite fabric was obtained in the same manner as in Example 1 except that the nanofiber nonwoven fabric was changed to the NY electrospun nonwoven fabric obtained in Production Example 3.

Example 4
A composite fabric was obtained in the same manner as in Example 2 except that the knitted fabric was changed to the polyester / cupra mixed mesh knitted fabric obtained in Production Example 6.

Example 5
A composite fabric was obtained in the same manner as in Example 2 except that the knitted fabric was changed to the polyamide elastomer sheet fabric obtained in Production Example 7.

Example 6
A composite fabric was obtained in the same manner as in Example 2 except that the knitted fabric was changed to the polyester sheet fabric obtained in Production Example 7.

Example 7
A composite fabric was obtained in the same manner as in Example 1 except that the nanofiber nonwoven fabric was changed to the cellulose electrospun nonwoven fabric obtained in Production Example 4.

Comparative Example 1
Only the PU electrospun nonwoven fabric was used without using the knitted fabric.

Comparative Example 2
Only the polyester mesh knitted fabric was used without using the nanofiber nonwoven fabric.

Comparative Example 3
A composite fabric was obtained in the same manner as in Example 1 except that a commercially available PU meltblown nonwoven fabric (UC0060F nonwoven fabric, manufactured by Kuraray Laflex Corp.) was used as the nanofiber nonwoven fabric.

Comparative Example 4
Without using a nanofiber nonwoven fabric, only a polyester sheet fabric was used.

Comparative Example 5
A composite fabric was obtained in the same manner as in Example 4 except that a commercially available PU meltblown nonwoven fabric (UC0060F nonwoven fabric, manufactured by Kuraray Laflex Corp.) was used as the nanofiber nonwoven fabric.

Comparative Example 6
A composite fabric was obtained in the same manner as in Example 1 except that a commercially available NY meltblown nonwoven fabric (NS0050H nonwoven fabric, manufactured by Clarek Laurex) was used as the nanofiber nonwoven fabric.

  The following evaluation tests were performed on the composite fabrics obtained in Examples 1 to 7 and the fabrics obtained in Comparative Examples 1 to 6.

<Evaluation Test 1: Contact Cooling and Endothermic Amount>
The composite fabrics obtained in Examples 1 to 7 and the fabrics obtained in Comparative Examples 1 to 6 were cut into 10 cm × 10 cm, and 4 ml of water (25 ° C.) was included in each fabric to obtain measurement samples. .

  The wet sample was measured for cold contact feeling using a KES-F7 Thermolab II precision rapid thermal property measuring device (manufactured by Kato Tech Co., Ltd.). The maximum value (W) of the protruding portion in the graph (FIG. 4) obtained by Thermolab II is a numerical value indicating the contact cooling sensation, and the larger this value, the greater the contact cooling sensation.

  The measurement was performed on the evaluation surface described in Table 2. In addition, about the composite fabric of Example 1, it measured from both the nanofiber nonwoven fabric side and the knitted fabric side.

  The time average value (W) of the graph shows a continuous cooling sensation, and was measured from immediately after the start to 30 minutes.

  Table 2 shows the results of contact cooling and continuous cooling.

<Evaluation Test 2: Vaporization Heat Test>
The composite fabric obtained in Example 1 was cut into 10 cm × 10 cm, and 4 ml of water (25 ° C.) was included to prepare a measurement sample. The nanofiber nonwoven fabric side of the measurement sample was attached to the upper arm of the subject, and the skin temperature of the part attached over time was measured (subject: ages 20-30s; 3 males and 3 females).

  Further, as a comparative experiment, a commercially available cooling sheet (Hotsama Sheet (registered trademark), manufactured by Kobayashi Pharmaceutical Co., Ltd.) was attached to the upper arm of the subject, and the skin temperature of the part attached over time was measured.

  The results are shown in Table 3 and FIG. In FIG. 5, the left side is a commercially available cooling sheet, and the right side is the composite fabric obtained in Example 1.

  From comparison between Comparative Examples 1 and 2 and Example 1, it can be seen that the contact cooling sensation when these are laminated is significantly improved from the contact cooling sensation obtained by the nanofiber nonwoven fabric alone and the knitted fabric alone.

  Further, it can be seen from Comparative Examples 3, 5, and 6 that the cold feeling of contact is inferior even when a melt blown nonwoven fabric is used.

  Furthermore, it can be seen from the heat of vaporization test that the composite fabric of the present invention has a feeling of cooling continuously for a certain period of time.

  That is, in the present invention, a very high cooling effect can be obtained only by combining the nanofiber nonwoven fabric and the knitted fabric.

Claims (6)

A composite fabric for a cooling sensation material, in which a nanofiber nonwoven fabric composed of fibers having a diameter of 50 nm or more and less than 2.5 μm and at least one layer of knitted fabric are laminated. The composite fabric for cooling sensation materials according to claim 1, wherein the nanofiber nonwoven fabric is laminated on the knitted fabric via an adhesive. The composite fabric for cooling sensation materials according to claim 1 or 2, wherein the knitted fabric is a mesh-shaped knitted fabric. The composite fabric according to any one of claims 1 to 3, wherein the adhesive is a mesh-like heat fusion film. The composite fabric for a cooling sensation material according to claim 2, wherein the composite fabric is a nanofiber nonwoven fabric composed of fibers having a diameter of 50 nm or more and less than 2.5 µm, an adhesive layer and a knitted fabric. A cooling sensation material comprising the composite fabric according to any one of claims 1 to 5.

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