JP2023014486A - Sheet, fiber product and miscellaneous including the same and sheet manufacturing method - Google Patents

Abstract

To provide a sheet, fiber products, and miscellaneous that are excellent in cooling effect, and a manufacturing method of the sheet that has the excellent cooling effect when being exposed to wind in the cases of walking, jogging, running, bicycle riding, etc.SOLUTION: A sheet has a plurality of pores. X calculated by the following formula is 250 to 1000 and area of inscribed circle at least in one of the pores is 2.0 to 64 mm2 in the sheet. X=(A×B×L)/C, where A is 1.2, and C is 1.8×10-5. B is 0.50 to 7.5. L is a representative length (m) between the pore and the other pore and takes a value of 1-3 to 10-3.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a sheet excellent in cooling effect, textile products and miscellaneous goods containing the same, and a method for producing the sheet.

When the wind blows and the low temperature wind hits it, it produces a cooling effect. When there is no wind, the air stays and the cooling efficiency deteriorates. In the case of skin, the influence of moisture is also taken into consideration. For example, wind blows move moist air near the surface of the body and replace it with relatively dry air. This allows the moisture in your sweat to evaporate more easily, lowering your body temperature. By feeling the flow of wind in this way, a cooling effect can be obtained as a bodily sensation.

Taking advantage of such a phenomenon, it is being studied to obtain a cooling effect by utilizing a specific movement of the wearer to ventilate through clothing in which highly breathable fabric is partially arranged (see, for example, Patent Document 1). . In addition, attempts have been made to promote a feeling of cooling by airflow that utilizes movement during exercise by having mesh holes of a specific size exist at a specific area ratio (see, for example, Patent Document 2). Further, there has been proposed a garment provided with a suction port for taking in received wind into the garment, taking in a large amount of outside air during exercise, and improving ventilation and exhaust efficiency (see, for example, Patent Document 3).

Japanese Patent Application Laid-Open No. 2018-40080 Patent No. 5061873 Japanese Patent Publication No. 2017-528615

However, the above-mentioned Patent Documents 1 to 3 all aim to obtain a cooling effect by improving the airflow in the clothes flowing from the intake port to the exhaust port, and do not describe the cooling effect of the intake port itself. .

For example, in the technique described in Patent Document 1, the air intake itself provided for ventilation is simply a mesh material such as tricot with a defined airflow rate, and the cooling effect itself is not sufficient.

Similarly, in Patent Document 2, the cooling effect of the mesh hole portion itself is not sufficient.

Furthermore, Patent Document 3 is also characterized by the shape of the opening and its arrangement in clothing, and like Patent Document 1, the opening itself has room for improvement.

An object of the present invention is to impart a cooling effect to the opening itself, and to provide a sheet excellent in cooling effect and a manufacturing method thereof. Another object of the present invention is to provide textile products expected to have a cooling effect in windy scenes such as walking, jogging, running, and cycling, as well as sundries such as hats, bags, shoes, and electronic devices.

In order to solve the above problems, the present invention has the following configuration.
(1) A sheet having a plurality of holes, wherein X calculated by the following formula is 250 to 1000, and the area of the inscribed circle in at least one of the holes is 2.0 to 64 mm ² . .
・X=(A×B×L)/C (Formula 1)
In Equation 1 above, A is 1.2 and C is 1.8×10 ⁻⁵ . B takes a value of 0.50 to 7.5, and L is a representative length (m) between the hole and the other hole adjacent thereto and takes a value of 1 ⁻³ to 10 ⁻³ m. .
(2) The sheet according to (1), wherein at least one of the holes is a polygon with three or more corners.
(3) The sheet according to (1) or (2), in which the plurality of holes are arranged in parallel.
(4) The sheet according to any one of (1) to (3), wherein at least one of the holes has an area ratio of 7.0% or more.
(5) The sheet according to any one of (1) to (4), wherein a thread end face is present at the end of at least one of the holes.
(6) The sheet according to any one of (1) to (5), which has an air permeability of 90.0 cm ³ /cm ² ·s or more according to JIS L1096 (2010) A method.
(7) The sheet according to any one of (1) to (6), wherein the sheet is a fiber structure.
(8) The sheet according to any one of (1) to (7), wherein the sheet is a cooling sheet.
(9) The sheet according to any one of (1) to (8), wherein the sheet is worn and the distance between at least a portion of the sheet and the skin is 2.0 to 20.0 mm.
(10) A textile product at least partially comprising the sheet according to any one of (1) to (9).
(11) The textile product according to (10), which at least partially contains a portion having an elongation rate of 5% or more.
(12) Sundries containing at least a part of the sheet according to any one of (1) to (9).
(13) Any one of (1) to (9), wherein a sheet having an air permeability of 150.0 cm ³ /cm ² s or less according to JIS L1096 (2010) A method is used, and a plurality of holes are formed by perforation processing. A method for manufacturing the sheet according to .

The sheet of the present invention has an excellent cooling effect on objects on the opposite side of the swept surface. A textile product containing at least a part of the sheet of the present invention has an excellent cooling effect and is useful for sportswear such as running wear and clothes. Goods containing the sheet of the present invention as at least a part thereof, such as hats, storage parts and belt parts of bags, upper materials of shoes, etc., can obtain an excellent cooling effect. Furthermore, the miscellaneous goods of this invention have the outstanding effect also in cooling an electronic device.

FIG. 1 is a schematic diagram showing an example of a sheet according to an embodiment. FIG. 2 is a schematic diagram showing an example of a sheet according to the embodiment. FIG. 3 is a schematic diagram showing an example of the sheet according to the embodiment. FIG. 4 is a diagram explaining an experiment using a hot plate and an air blower. FIG. 5 is a schematic diagram of a sheet according to Example 1. FIG. FIG. 6 is a schematic diagram of a sheet according to Example 2. FIG. FIG. 7 is a schematic diagram of a sheet according to Example 3. FIG. FIG. 8 is a schematic diagram of a sheet according to Example 4. FIG. FIG. 9 is a schematic diagram of a sheet according to Example 5. FIG. FIG. 10 is a schematic diagram of a sheet according to Example 7. FIG. FIG. 11 is a schematic diagram of a sheet according to Example 8. FIG. 12 is a schematic diagram of a sheet according to Comparative Example 1. FIG. 13 is a schematic diagram of a sheet according to Comparative Example 2. FIG. 14 is a schematic diagram of a sheet according to Comparative Example 3. FIG. 15 is a schematic diagram of a sheet according to Comparative Example 4. FIG. 16 is a schematic diagram of a sheet according to Comparative Example 5. FIG.

The present invention will be described in detail below.

The sheet of the present invention is suitable for use in cooling an object on the opposite side of the sheet to the wind receiving surface, and is preferably a cooling sheet.

The form of the sheet is not particularly limited, and examples thereof include sheet-like fiber structures containing fibers at least in part, such as woven fabrics, knitted fabrics, and non-woven fabrics, as well as paper, films, resin boards, fiber composite materials, and the like. Among them, a fiber structure is preferable in that it has versatility and the tissue can be used as a method for producing the present sheet.

The fiber structure in the present invention is not particularly limited as long as it is a structure containing fibers, but the fiber content in the structure is preferably 50% by weight or more, more preferably 70% by weight or more. The upper limit is 100% by weight. Resins such as polyurethane and epoxy, and particles may be included in addition to the fibers. In addition, materials other than fibers, such as films, may be laminated.

The material constituting the sheet in the present invention is not particularly limited, but polyesters such as polyethylene terephthalate, polyethylene naphthalate, polytrimethylene terephthalate and polybutylene terephthalate, polyamides such as nylon 6 and nylon 66, acrylics, polyurethanes, polyimides and the like. Resin etc. can be illustrated. Of these, thermoplastic resins are preferred because the shape of the holes can be easily controlled.

When the sheet of the present invention is a fiber structure, the fibers include natural fibers such as cotton and silk, chemical fibers such as rayon and triacetate, and polyester fibers such as polyethylene terephthalate, polyethylene naphthalate, polytrimethylene terephthalate, and polybutylene terephthalate. , polyamide fibers such as nylon 6 and nylon 66, polyurethane fibers, polyphenylene sulfide fibers, synthetic fibers such as polyimide fibers, and the like, but are not particularly limited. Among them, polyester fiber is preferable because it does not wrinkle easily and the pore shape tends to be stable. In addition, it is preferable that the wall surface of the hole is smooth with few fluffs and irregularities from the viewpoint of easy formation of airflow turbulence, which will be described later. A crimped yarn is preferred. In the case of short fibers, twisted yarns are preferable in order to obtain a smooth wall surface with fluff or the like.

In the present invention, the fiber fineness of the fiber structure is preferably 50 decitex (dtex) or more, more preferably 70 dtex or more, from the viewpoint of strength and the like when used for clothing. In addition, from the viewpoint of feeling and the like, it is preferably 300 dtex or less, more preferably 200 dtex or less. For applications other than clothing, for example, when used for hats, shoes, parts of bags, etc., the range of 300 to 1000 dtex is preferable from the viewpoint of stiffness and strength.

In the present invention, when the fiber structure is a knitted fabric, the structure is not particularly limited as long as the holes in the present invention are formed. Also, any machine such as a warp knitting machine or a circular knitting machine may be used. Preferred knitting structures include a mesh structure, a power net structure, a jacquard structure, and the like, in that the holes in the present invention can be formed more easily. When using a single knitting machine, the holes and non-holes are alternately arranged at regular intervals in the wale direction, and the holes in the course direction may be in the same row as in the wale direction, or may be staggered. Absent. In a two-layer structure or a three-layer structure using a double knitting machine or the like, a plurality of layers may be used to configure the hole portion, and the holes may overlap to form a thick hole. Also, in double-sided knitting such as milling knitting, holes may be formed on either the cylinder side or the dial side. In the case of milling knitting, for example, in which the structure is the same when viewed from either the front or back side, either side may be the front side. In the case of a multi-layered structure, it is more preferable that holes penetrate from the front surface to the back surface.

Also in the case of woven fabric, the texture is not particularly limited as long as the holes in the present invention are formed. For example, plain weave, twill weave, satin weave and the like can be exemplified, and preferred woven weaves include imitation weave and leno weave in that the holes in the present invention can be easily formed. A method of interweaving eluted yarns and non-eluted yarns is also a preferred embodiment. For example, by using an elution thread in the portion that will become the pore and eluting it during processing after dyeing, it is possible to create a hole at an arbitrary position and size.

The nonwoven fabric is not particularly limited, and may be spunbond nonwoven fabric, meltblown nonwoven fabric, needle-punched nonwoven fabric, paper-made nonwoven fabric, or the like, as long as the holes are formed in the nonwoven fabric of the present invention. Non-woven fabric is a preferred embodiment in that holes are not easily frayed when holes are formed by a hole-opening process or the like, which will be described later.

Further, as the sheet of the present invention, a resin board, a film, a composite material, or the like is also a preferred embodiment in that holes can be easily formed by a hole punching process or the like. The manufacturing method can also be appropriately selected from injection molding, extrusion, and the like. When a sheet is formed by extrusion, it is also possible to form desired ventilation holes by punching to form holes, or by partially compressing such as thermal compression to form a thin-walled portion. .

In the present invention, holes can be formed in the texture of the woven or knitted fabric, etc. However, even if there are no holes in the present invention, the sheet of the present invention can be obtained by forming a plurality of holes by perforating. is also possible. For example, the manufacturing method is not particularly limited in the present invention, such as a method of forming holes in the fabric using punching or laser cutting, or a method of forming holes by opal processing. These methods are preferable to the formation of holes by the above-described woven or knitted fabric in that holes can be easily formed in any shape and the degree of freedom is increased. When the holes are formed by these methods, it is preferable that the apparent density or the density of the woven or knitted fabric is high because the threads are less likely to fray from the cut surface. In the present invention, the knitted fabric preferably has 40 or more wales and 50 or more courses, and preferably has 50 or more wales and 60 or more courses. On the other hand, a wale of 60 or less and a course of 100 or less are preferable in terms of high air permeability. The woven fabric preferably has a cover factor of 1700 or more, more preferably 2000 or more. On the other hand, it is preferably 2,600 or less, more preferably 2,200 or less, in terms of high air permeability. In addition, it is more preferable to use a material that is difficult to unravel, such as a free-cut material. Note that the cover factor (Cf) is obtained by the following formula.
Cf=N _W ×(D _W ) ^1/2 +N _F ×(D _F ) ^1/2
N _W : warp weave density (number/2.54 cm)
N _F : weft weave density (thread/2.54 cm)
_DW : warp total fineness (dtex)
D _F : Weft total fineness (dtex).

Further, in the present invention, it is preferable that the end face of the yarn is present at the end of at least one hole because the cooling effect due to turbulence of the airflow described below is excellent. Among the holes in the sheet of the present invention, more preferably 1/2 or more of the holes have thread ends, and more preferably 2/3 or more of the holes have thread ends. The end face of the thread is a cross section or the like formed by cutting the thread or the like, and can be obtained, for example, by the above-described perforating process.

In the sheet of the present invention, X is 250 to 1000 as calculated by Equation 1 below.
・X=(A×B×L)/C (Formula 1)
In Equation 1 above, A is 1.2, which approximates the density of the atmosphere (1.165 g/cm ³ ) in the present invention. Also, C is 1.8×10 ⁻⁵ which approximates the viscosity coefficient of the atmosphere (1.83×10 ⁻⁵ ). B takes a value of 0.50 to 7.5 assuming a flow velocity (m/sec) corresponding to the usage environment in which the cooling effect of the sheet of the present invention is expected. For example, as shown in Table 1, it is preferably 0.50 to 2.0 for miscellaneous goods. For textile products, it is preferably 1.0 to 7.5. Table 1 lists preferred values of B according to applications. Further, when the intended use of the sheet is not determined, it is preferable to set B to 2.0 from the viewpoint of versatility and being able to exhibit the effects of the present invention more. L is a representative length (m) between one hole and another hole in the sheet of the present invention, and is 1 ⁻³ to 10 ⁻³ in the present invention.

If X is less than 250, the expected cooling effect cannot be obtained. As will be described later, this is thought to be due to the fact that the turbulence of the airflow is small and the replacement of the air on the surface of the object to be cooled is insufficient. It is preferably 400 or more, more preferably 500 or more. Even if X exceeds 1000, the expected cooling effect cannot be obtained. The reason for this is also considered to be that the turbulence of the airflow is lost and the replacement of the air on the surface of the object to be cooled becomes insufficient. It is preferably 900 or less, more preferably 800 or less.

Here, it is not clear why the above X in the present invention is within the range of the present invention so that cooling can be performed effectively. One possible reason is the viewpoint of the Reynolds (hereinafter sometimes abbreviated as “Re”) number. The wind hits the sheet having the holes, and the wind may be rectified or turbulent as it passes through the holes. At this time, turbulence in the airflow may affect the cooling effect.

In general, it is known to use the Re number to organize how airflow passes through an object. The Re number is one of dimensionless quantities without a unit, and is defined by the ratio of inertial force and viscous force (inertial force/viscous force) in fluid dynamics. As an example, in a model in which an airflow hits the side surface of a cylinder and flows, the state of the flow passing through can be represented by the following Equation 2.

Re = (atmospheric density x flow velocity x representative length)/atmospheric viscosity coefficient (Formula 2)
Since the Re number is the ratio of inertia and viscosity, the Re number increases when the momentum is large and the inertia is dominant. Conversely, if the flow is predominantly viscous, the Re number will be small. As the Re number increases, for example, in the cylinder model described above, when an axis passing through the cross-sectional center of the cylinder and perpendicular to the flow direction is drawn, the vertical axis serves as a boundary between the upstream and downstream airflows. It becomes asymmetrical, and vortices are formed alternately on the downstream side. As the Re number increases, a Karman vortex street in which vortices with opposite directions of rotation are arranged in a zigzag pattern is formed on the downstream side. As the Re number increases further, the vortices are generated more regularly, and when the Re number exceeds a certain value, the vortices are no longer generated.

Although the relationship between the cooling effect of the sheet of the present invention and the Re number is not clear, X in the present invention is similar to the formula of the cylindrical model, and both the cooling effect and the turbulence of the airflow are within a specific range. It is also similar in that it is expressed in For example, the Karman vortex street occurs in the range of approximately 200 to 1000 in the case of the cylinder model, which approximately matches the range of X in the present invention. It is thought that when the turbulence of the airflow increases and the change in the airflow increases due to the Karman vortex street, the replacement of the air stagnating on the surface of the object to be cooled is accelerated, making it easier to feel cool. Although it is not clear whether the Karman vortex street is generated in the present invention, it is possible to obtain a cooling effect by setting X within the range of the present invention.

In addition, the representative length (L) in the present invention is the shortest distance between a hole and another hole adjacent thereto in a plurality of holes in the sheet of the present invention (hereinafter referred to as "closest distance" sometimes). Although there may be a plurality of holes adjacent to one hole, the shortest closest distance among them is defined as the representative length (L) in the present invention. It is a preferred embodiment to make X within the range of the present invention by controlling the representative length (L). As shown in Table 1, the preferred value of B in Formula 1 differs depending on the application, and the preferred value of L also varies accordingly. For example, in the case of clothes worn as everyday wear, the thickness is preferably 5.0×10 ⁻³ m (5.0 mm) or more, more preferably 7.0×10 ⁻³ m (7.0 mm) or more. Also, it is preferably 10×10 ⁻³ m (10 mm) or less. For clothing worn for sports, the thickness is preferably 2.0×10 ⁻³ m (2.0 mm) or more, and preferably 7.0×10 ⁻³ m (7.0 mm) or less.

Here, the representative length (L) will be described more specifically with reference to FIG. 1, which is an example of the sheet of the present invention. In the sheet of the present invention, the sheet 11 has a plurality of holes 12, and the closest distance 13 between an arbitrarily selected hole and the laterally adjacent hole is the representative length (L) in the present invention. In FIG. 1, a closest distance 14a (or 14b, where 14a and 14b are assumed to be equal) between the hole 12 and the adjacent hole below can also occur. or 14b), the shorter one is the representative length (L) in the present invention. Also, in the case where the sheet has a sheet 21 and a diamond-shaped hole 22 as shown in FIG. 2, the shorter of the closest distance 23 and the closest distance 24 in the hole 22 is defined as the representative length (L) in the present invention. . In addition, when there are three or more holes and a plurality of representative lengths (L) are obtained, the average value of the representative lengths (L) in the three randomly selected holes is taken as the representative length (L) in the sheet. . The values of the closest distance and representative length (L) are determined by the method described in Examples. If the holes are not evenly arranged and the hole density is uneven, the parts with the same hole density are regarded as one sheet, and the parts with different hole densities are regarded as separate sheets, and each sheet is randomly selected. Pick 3 holes. Here, the portion having the same hole density is a portion within a range of 20% above and below the average value of the area ratio of the holes, which will be described later.

In the present invention, the shape of the holes is not particularly limited, and can be appropriately selected from round, elliptical, polygonal, etc. However, in terms of excellent cooling effect, at least one hole should be polygonal with three or more corners. Preferred are squares, rhombuses, triangles, for example. In the present invention, it is not strictly necessary to have these shapes, and it is only necessary to have substantially those shapes. Specifically, the length of one side and the base angle do not need to be exactly equal, and distortion and unevenness may be present within the range that does not impair the effects of the present invention. Also, corners such as vertical angles may be rounded as long as they do not impair the effects of the present invention. More preferably, 1/2 or more of the holes in the sheet of the present invention have the above shape, and more preferably 2/3 or more of the holes have the above shape. Further, the holes may face in the same direction, may be horizontally or vertically symmetrical, or may face randomly.

In the sheet of the present invention, the arrangement of the holes is not particularly limited, such as parallel or zigzag, but parallel arrangement is preferable because of excellent cooling effect. In addition, as a preferable arrangement of the holes, two starting points of the closest distance that becomes the representative length (L) between an arbitrary hole and an adjacent hole can be set at a distance of 1 mm or more. The maximum distance (D) between points is 1 mm or more. It is more preferably 2 mm or more, and even more preferably 3 mm or more. For example, in a sheet in which diamond-shaped holes are regularly arranged as shown in FIG. 2, if the representative length (L) is the closest distance 24, it is one of the starting points 31 of the closest distance. This portion is presumed to be a portion where turbulence of the airflow is likely to occur. On the other hand, in the arrangement as shown in FIG. 1, since one side of one hole and one side of the adjacent hole are long, two or more points of closest distance 14a and closest distance 14b can be taken. Here, when the closest distance 14a and the closest distance 14b are equal, both have a representative length (L), and two starting points can be taken. At this time, like the distance 32 between the starting points shown in FIG. 1, the distance (D) between these two points is preferably 1 mm or more. 1 is more preferable than FIG. 2 in the present invention because airflow turbulence is likely to occur along this one side. Even if the area is the same size, the longest one side is an equilateral triangle with few corners. If the holes are not evenly arranged and the hole density is uneven, the part with the same hole density is regarded as one sheet, and the part with the different hole density is regarded as another sheet. Here, the portion having the same pore density is the portion within the range of the upper and lower standard deviation of the average value, or the portion within the range of 20% above and below the average value, when the standard deviation of the area ratio of the holes to be described later is obtained. is. In the present invention, the maximum distance (D) between two points is determined by the method described in Examples.

In the present invention, the area of the inscribed circle in at least one hole is 2.0 mm ² or more. It is preferably 9.0 mm ² or more, more preferably 20 mm ² or more. By being 2.0 mm ² or more, it is possible to enhance the cooling effect and improve the air permeability. Moreover, an upper limit is 64 mm< ² > or less. It is preferably 50 mm ² or less, more preferably 30 mm ² or less. By setting it to 64 mm ² or less, the holes can be made small while maintaining the cooling effect and air permeability, and foreign matter can be prevented from entering through the holes. It is preferable that there are a plurality of holes having such an area, and in the holes in the sheet of the present invention, it is more preferable that 1/2 or more of the holes have the above area, and 2/3 or more of the holes have the above area. is more preferred. For the area of the inscribed circle in the present invention, the value obtained by the method described in Examples is used.

In the present invention, in order to improve the cooling effect, the air permeability of the sheet is 90.0 cm ³ /cm ² · in terms of excellent cooling effect when measured by the A method (Fragile method) specified in JIS 1096:2010. s or more, and more preferably 150.0 cm ³ /cm ² ·s or more. Moreover, it is preferable that it is 500.0 cm ³ /cm ² ·s or less because the cooling effect is excellent. The reason for this is not clear, but it is conceivable that the more wind passing through the sheet, the less wind turbulence generated by passing through the perforations.

In addition, the air permeability of the portion between the holes in the sheet of the present invention and/or the sheet before perforation processing is preferably 150.0 cm ³ /cm ² ·s or less, and 100.0 cm ³ /cm ² . ·s or less is more preferable, and 50.0 cm ³ /cm ² ·s or less is more preferable. In the present invention, by setting the air permeability to the range described above, the ventilation of the holes defined in the present invention increases, and the cooling effect can be improved. As the air permeability in the present invention, the value obtained by the method described in Examples is used.

Further, the area ratio of at least one of the holes in the present invention is preferably 7.0% or more, more preferably 10% or more, and more preferably 15% or more in terms of excellent cooling effect. It is even more preferable to have Although the upper limit is not particularly limited, if it is 50% or less, it is possible to reduce the sense of sheerness in textile products, and to prevent foreign matter from entering through the holes in miscellaneous goods. Here, the area ratio of the holes in the present invention means the ratio obtained by dividing the area of the holes by the area of the sheet containing the holes, expressed as a percentage. Also, the area of the sheet including the holes is the measurement of the largest area square containing only one hole. Specifically, with reference to FIG. 1, the area ratio of the sheet 11 is a value obtained by dividing the hole area 12s by the sheet area 11s including the hole. Therefore, the ratio of the area of the holes to the sheet is expressed as a percentage by calculating the hole area 12s/the sheet area 11s. Similarly, the sheet area 21s is used in FIG. Specifically, the values obtained by the methods described in Examples are used. More preferably, 1/2 or more of the holes in the sheet of the present invention have the above area ratio, and more preferably 2/3 or more of the holes have the above area ratio.

The textile product of the present invention contains at least a part of the sheet of the present invention. Textile products are not particularly limited and include clothes, curtains, blinds, towels, handkerchiefs, sheets and the like, with clothes being a preferred embodiment. In the case of clothing, the sheet of the present invention may be used alone, but the sheet of the present invention is used as an intake port to obtain a cooling effect at the intake port, and an exhaust port is provided separately to improve the breathability of the clothing. Obtaining a synergistic effect is also a preferred aspect. As clothes, sportswear such as running wear and cycling wear is preferable in that the cooling effect of the wind can be exhibited more effectively. When walking or running while wearing sportswear, by arranging the seat of the present invention in a portion receiving wind, it is possible to receive more wind and obtain a higher cooling effect. Needless to say, clothing other than sportswear can also efficiently cool the body heat generated according to the amount of exercise during walking and running, and a similar effect can be obtained.

The miscellaneous goods of the present invention contain at least a part of the sheet of the present invention. Examples of miscellaneous goods include not only items to be worn such as hats, belts, bags, shoes, and gloves, but also electronic devices such as batteries, personal computers, telephones, etc., and household appliances such as televisions, stereos, and refrigerators. is not particularly limited as long as it is preferable. In the present invention, miscellaneous goods made of fibers can also be classified as textile products.

For example, it is also a preferred embodiment to include the sheet of the present invention on the sides or top of a cap. When going out, especially in hot weather such as summer, a hat is worn to prevent heatstroke, but the inside of the hat tends to get stuffy due to perspiration from the scalp. Occasionally, the hat is removed to reduce the feeling of stuffiness, but the effect is quickly lost after the hat is put back on. By arranging the sheet of the present invention on the side or upper part where the wind is received during walking or running, it is possible to obtain a stronger cooling sensation and suppress the feeling of stuffiness due to sweat.

It is also preferable that the belt portion of the bag includes the sheet of the present invention. Bags are frequently used on a daily basis, regardless of age or gender, such as commuting to school or work. A bag equipped with a shoulder belt and/or a shoulder belt is often used, but especially in the summer, stuffiness occurs between the belt portion and the body, making the user feel uncomfortable. When the sheet of the present invention is included in the belt portion, it is possible to suppress stuffiness due to the cooling effect.

It is also preferred to include the sheet of the present invention in the shoe upper material. Generally, commercially available running shoes have a mesh-like fabric to suppress discomfort caused by stuffiness. By including the sheet of the present invention, it is possible to further enhance the cooling effect and further suppress the damp feeling inside the shoe.

It is also a preferred embodiment to include the sheet of the present invention in an electronic device. The internal battery heats up when the electronic devices that are widely used in general companies and homes are used for a long time, so a part of the housing is provided with a hole for cooling. By including the sheet of the present invention, the cooling effect can be further enhanced.

In the present invention, it is desirable to have a gap between the sheet of the present invention and the object to be cooled because the cooling effect is excellent. It is presumed that this is because the turbulence of the airflow from the holes is effectively utilized. By setting the distance between at least part of the sheet and the object to be cooled to preferably 2.0 mm or more, more preferably 5.0 mm or more, the cooling effect is improved. On the other hand, it is preferably 20.0 mm or less, more preferably 10.0 mm or less, in terms of excellent cooling effect. It is presumed that the generated vortex hits the object to be cooled effectively. These distances need not always be constant. When the sheet of the present invention is an article to be worn such as clothes, hats, shoes, belts, etc., it is preferable that the distance between at least a part of the sheet of the present invention and the skin be within the above range. It should be noted that not all items to be worn need to be the sheet of the present invention, and at least a portion thereof may be the sheet of the present invention. Here, the above distance may be generated temporarily by moving the body, for example. In addition, the sheet of the present invention is placed on the sides, hem, and around the neck where gaps are likely to occur due to sagging of clothes, and the flanks where gaps are likely to occur between the skin and the fabric due to movements of the human body such as walking and running. From the standpoint of cooling the human body, it is more preferable to use the armpits or the front neck area where the thermal sensation is likely to be felt. It is a preferable aspect that the surface of the sheet on the side to be cooled has an uneven shape by a woven or knitted fabric structure, a spacer, or the like, from the viewpoint of effectively creating a gap.

In addition, the elongation rate of at least a portion of products such as textiles and miscellaneous goods containing the sheet of the present invention, particularly textiles, is 5% or more, more preferably 10% or more, and still more preferably 20% or more. This is a preferred embodiment in that the preferred distance of is easily formed. The sheet of the present invention does not necessarily need to have the above elongation rate as long as it is present in at least a part thereof, but in terms of easy control of the above distance, the elongation rate of at least one of the sheet of the present invention or the portion adjacent to the sheet is The above range is a preferred embodiment. The upper limit of the elongation rate is not particularly limited, but if the elongation rate is too large, it tends to be difficult to maintain an appropriate gap. The adjacent portion means a portion directly or indirectly connected to the sheet of the present invention. The elongation rate referred to in the present invention uses a value measured according to JIS L 1096 (low load method). In order to obtain the above elongation rate, a conventionally known method such as selecting a stretchable structure as the structure of the woven or knitted fabric or using stretchable yarn such as crimped yarn or elastic yarn is adopted. can do.

Examples will be described below in detail.

[Various tests and evaluation methods]
A. Cooling Effect of Sheet The cooling effect of the sheet was measured as follows. A heat retention tester ("KES-F7" manufactured by Kato Tech Co., Ltd.) was used for the measurement. evaluated. It can be said that the larger the power consumption for the hot plate to maintain the set temperature, the higher the cooling effect. A schematic diagram of the measurement is shown in FIG.

In an indoor environment of 20° C. and 65% RH, a hot plate 4d with a size of 10 cm square and adjusted to 40° C. is blown with air of 1.5 to 2.0 m/sec in the direction shown by the blowers 4a to 4b, power consumption. A(W) was observed. Next, the sample 4c was placed on the hot plate 4d, and the wind was applied to it in the same manner, and the power consumption B (W) was observed. Then, the cooling effect was calculated from the ratio (B/A) of the power consumption B when the power consumption A was 100%. At this time, the power consumption (W) was obtained as an average value for 60 seconds after starting the measurement with the air blowing. Also, the evaluation was performed with a gap of 5.0 mm to 15.0 mm provided between the hot plate and the sheet.

B. Calculation of X X was calculated by the following formula.
・X=(A×B×L)/C
- In the above formula, A is set to 1.2.
- In the above formula, B is the average flow velocity (m/sec) used when measuring the cooling effect described in A above. The flow velocity was measured by fixing a sample and an anemometer ("model 6501" manufactured by Nippon Kanomax Co., Ltd.) at a distance of 20 cm from the blower, and the average value for 15 seconds was used. Two significant digits were used, and the third digit was rounded off.
・In the above formula, C is set to 1.8×10 ⁻⁵ .
- L in the above formula is a representative length (m) between a hole in the sheet and another hole. The representative length was measured using a microscope (“VHX-2000” manufactured by KEYENCE Co., Ltd.) utilizing the image analysis function. Specifically, first, the sample was placed on the measuring table in a non-tensioned state. Three randomly selected holes were then measured in mm to 2 significant figures and rounded to the third digit. An average value was obtained from the obtained results, and the representative length (L) in the above formula was obtained in units of m.

C. Measurement of maximum distance (D) distance between two points A sample was placed in a non-tensioned state on a measuring table of a microscope (“VHX-2000” manufactured by KEYENCE Co., Ltd.). In three randomly selected holes, if there are two or more starting points where the closest distance is the same when the closest distance is rounded off to the first decimal place in units of mm, the two points where the starting points are the furthest apart. selected and the length of the distance was measured in millimeters to the first decimal place. The obtained results were averaged, rounded off to the first decimal place, and obtained as an integer to obtain the maximum distance (D) between two points.

D. Area of Inscribed Circle A sample was placed in a non-tensioned state on a measuring table of a microscope (“VHX-2000” manufactured by KEYENCE Co., Ltd.). In three randomly selected holes, the side length was measured in mm to one decimal place. The obtained results were averaged and rounded off to the first decimal place to obtain an integer. It was then calculated using the formula in plan view. The third digit was rounded off with two significant digits.

E. Perforation area ratio Using the image analysis function of the free software “GIMP”, the perforated and non-perforated areas are divided by brightness, and the area ratio of the perforations in the maximum area of a square containing one perforation (area of perforation/including perforation) square maximum area) was calculated. Three holes were randomly selected and measured, and the significant figure was rounded to the third digit with two digits.

F. Air Permeability Measured according to Method A (Fragile method: Differential pressure 125 Pa) described in Section 8.26 of JIS L 1096:2010 "Testing methods for woven and knitted fabrics".

G. Elongation rate Measured according to JIS L 1096 (low load method).

[Example 1]
A 3D printer was used to obtain the sheet of FIG. 5 with a plurality of triangular holes with a maximum distance (D) of 3 mm and an inscribed circle area of 2.4 mm ² . This sheet had a plurality of holes of the same shape arranged in parallel and symmetrical in the left-right and up-down directions, and the representative length (L) between the holes was 3.0×10 ⁻³ m. The area ratio of the holes in this sheet was 14%, and the permeability by the Frazier method was 201 cm ³ /cm ² ·s. A wind having an average flow rate of 2.0 m/sec was passed through this sheet to evaluate the cooling effect.

[Example 2]
A 3D printer was used to obtain the sheet of FIG. 6 with a plurality of triangular holes with a maximum distance (D) of 6 mm and an inscribed circle area of 9.4 mm ² . This sheet had a plurality of holes of the same shape arranged in parallel and symmetrically in the left-right and up-down directions, and the representative length (L) between the holes was 3.1×10 ⁻³ m. The area ratio of the holes in this sheet was 29%, and the permeability by the Frazier method was 371 cm ³ /cm ² ·s. A wind having an average flow rate of 1.5 m/sec was passed through this sheet to evaluate the cooling effect.

[Example 3]
A 3D printer was used to obtain the sheet of FIG. 7 with a plurality of triangular holes with a maximum distance (D) of 3 mm and an average inscribed circle area of 2.4 mm ² . This sheet had a plurality of holes of the same shape arranged side by side symmetrically in the left-right and up-down directions, and the representative length (L) between the holes was 6.0×10 ⁻³ m on average. In addition, the area ratio of the holes in this sheet was 7.1%, and the permeability according to the Frazier method was 93 cm ³ /cm ² ·s. A wind having an average flow rate of 2.0 m/sec was passed through this sheet to evaluate the cooling effect.

[Example 4]
A 3D printer was used to obtain the sheet of FIG. 8 with a plurality of triangular holes with a maximum distance (D) of 6 mm and an inscribed circle area of 9.4 mm ² . This sheet had a plurality of holes of the same shape arranged in parallel and symmetrical in the horizontal and vertical directions, and the representative length (L) between the holes was 6.0×10 ⁻³ m. In addition, the area ratio of the holes in this sheet was 18%, and the permeability according to the Frazier method was 192 cm ³ /cm ² ·s. A wind having an average flow rate of 2.0 m/sec was passed through this sheet to evaluate the cooling effect.

[Example 5]
Using a single circular knitting machine with a needle density of 46 gauge, 100% polyester textured yarn (84 dtex) was used to knit a raw fabric with a jersey texture to obtain a fabric subjected to general dyeing finishing. This fabric had an elongation rate of 40% and an air permeability of 32.6 cm ³ /cm ² ·s. Thereafter, a laser cutting machine was used to obtain the sheet of FIG. 9 having a plurality of triangular holes 91 with a maximum distance (D) of 6 mm and an inscribed circle area of 9.4 mm ² . This sheet had a plurality of holes of the same shape arranged in parallel vertically and horizontally symmetrically, and the representative length (L) between the holes was 6.0×10 ⁻³ m on average. In addition, the area ratio of the holes in this sheet was 18%, the permeability by the Frazier method was 207 cm ³ /cm ² ·s, and the elongation rate was 45%. A wind having an average flow rate of 2.0 m/sec was passed through this sheet to evaluate the cooling effect.

[Example 6]
A wind having an average flow rate of 1.5 m/sec was passed through the sheet obtained in Example 5, and the cooling effect was evaluated.

[Example 7]
A cardboard with a thickness of 0.3 mm was cut out to obtain a sheet of FIG. 10 having a plurality of rhombic holes 101 with a maximum distance (D) of less than 1 mm and an inscribed circle area of 22 mm ² . The holes of this sheet are of the same shape and are arranged in a horizontal direction, and in a staggered arrangement in which they are arranged in staggered positions in the vertical direction, and the representative length (L) between the holes is 3.1. ×10 ⁻³ m. In addition, the area ratio of the holes in this sheet was 42%, and the permeability according to the Frazier method was 459 cm ³ /cm ² ·s. A wind having an average flow rate of 2.0 m/sec was passed through this sheet to evaluate the cooling effect.
[Example 8]
A cardboard with a thickness of 0.3 mm was cut out to obtain a sheet of FIG. 11 having a plurality of square holes with a maximum distance (D) of 6 mm and an inscribed circle area of 19 mm ² . This sheet had a plurality of holes of the same shape arranged in parallel vertically and horizontally symmetrically, and the representative length (L) between the holes was 6.0×10 ⁻³ m on average. In addition, the area ratio of the holes in this sheet was 8.7%, and the permeability according to the Frazier method was 190 cm ³ /cm ² ·s or more. A wind having an average flow rate of 2.0 m/sec was passed through this sheet to evaluate the cooling effect.

[Comparative Example 1]
A 3D printer was used to obtain the sheet of FIG. 12 with a plurality of triangular holes with a maximum distance (D) of 6 mm and an inscribed circle area of 9.4 mm ² . This sheet had a plurality of holes of the same shape arranged in parallel and symmetrically in the left-right and up-down directions, and the representative length (L) between the holes was 1.1×10 ⁻³ m. In addition, the area ratio of the holes in this sheet was 60%, and the permeability by the Frazier method was 700 cm ³ /cm ² ·s or more. A wind having an average flow rate of 2.0 m/sec was passed through this sheet to evaluate the cooling effect.

[Comparative Example 2]
A 3D printer was used to obtain the sheet of FIG. 13 with a plurality of triangular holes with a maximum length (D) of 9 mm and an inscribed circle area of 21 mm ² . This sheet had a plurality of holes of the same shape arranged in parallel and symmetrical in the left-right and up-down directions, and the representative length (L) between the holes was 1.0×10 ⁻³ m. In addition, the area ratio of the holes in this sheet was 72%, and the permeability according to the Frazier method was 700 cm ³ /cm ² ·s or more. A wind having an average flow rate of 2.0 m/sec was passed through this sheet to evaluate the cooling effect.

[Comparative Example 3]
A cardboard with a thickness of 0.3 mm was cut out to obtain a sheet of FIG. 14 having a plurality of rhombic holes 131 with a characteristic length (D) of less than 1 mm and an inscribed circle area of 227 mm ² . The holes in this sheet are of the same shape and are aligned in the horizontal direction, and in the vertical direction in a staggered arrangement, and the representative length (L) between the holes is 1.8. ×10 ⁻³ m. In addition, the area ratio of the holes in this sheet was 79%, and the permeability according to the Frazier method was 700 cm ³ /cm ² ·s or more. A wind having an average flow rate of 2.0 m/sec was passed through this sheet to evaluate the cooling effect.

[Comparative Example 4]
A 100% polyester drawn yarn (84 dtex) is knitted with a Raschel warp knitting machine, and has a representative length (D) of less than 1 mm and an inscribed circle area of 5.1 ^mm2 . A net-like sheet of The holes of this sheet are of the same shape and are arranged in a horizontal direction, and in a staggered arrangement in which they are arranged in staggered positions in the vertical direction, and the representative length (L) between the holes is 0.7. ×10 ⁻³ m. The area ratio of the holes in this fabric was 72%, and the air permeability measured by the Frazier method was 700 cm ³ /cm ² /sec or more. A wind having an average flow rate of 2.0 m/sec was passed through this sheet to evaluate the cooling effect.

[Comparative Example 5]
Knitting 100% polyester drawn yarn (56 dtex) with a Raschel warp knitting machine, having a representative length (D) of less than 1 mm, and having a plurality of rhombic holes with an inscribed circle area of 1.4 mm ² Figure 16 got a sheet of The holes of this sheet are of the same shape and are arranged in a horizontal direction, and in a staggered arrangement in which they are arranged in staggered positions in the vertical direction, and the representative length (L) between the holes is 13.0. ×10 ⁻³ m. The area ratio of the holes in this fabric was 2.0%, and the air permeability measured by the Frazier method was 603 cm ³ /cm ² ·s or more. A wind having an average flow rate of 2.0 m/sec was passed through this sheet to evaluate the cooling effect.

Table 2 summarizes the results of evaluating the performance of the sheets obtained in Examples 1 to 8 and Comparative Examples 1 to 5 above. X of Examples 1-8 was 250 or more, and 10%-37% higher power consumption was recorded. That is, it was found that the hot plate was cooled more strongly. In particular, in Examples 4, 5, and 8, X was 800, and the turbulence of the airflow was remarkable, so it was inferred that the hot plate was cooled strongly. Moreover, since the shape of these holes is triangular or square, the maximum distance (D) is relatively long at 6 mm. In addition, when the sheet obtained in Example 5 was applied to the entire surface of the front part of the body and the garment was applied to the flanks, the sheet was worn. I was able to confirm the effect.

On the other hand, in Comparative Examples 1 to 5, it was found that the cooling effect of the hot plate could not be expected, although the hole ratio and air permeability were higher than those in Examples 1 to 8. In Comparative Examples 1 to 4, X was small, and the airflow could not be disturbed, or even if the airflow could be disturbed, it was insufficient to cool the cooling object. Moreover, it was found that the cooling effect cannot be expected for the case where X exceeds 1000 as in Comparative Example 5. It was surmised that when X exceeded 1000, the turbulence of the airflow was lost, and it was insufficient to cool the object to be cooled. From these results, it was found that the sheet of the present invention is superior to the comparative example of the prior art in cooling the object to be cooled.

11 Sheet 11s having square holes Area of sheet having a plurality of holes 12s 12 Square holes 12s Area of holes 13 Closest hole to hole of sheet having square holes Distance (representative length)
14a... Closest distance (representative length) between holes of sheet having square holes
14b... Closest distance (representative length) between holes in a sheet having square holes
21 Sheet having rhombus holes 21s Area of sheet including holes 22 Rhombus holes 23 Closest distance (representative length) between holes of sheet having rhombus holes
24 ... Closest distance (representative length) between holes of a sheet having rhombic holes
31... Starting point of closest distance in hole of sheet 21 32... Distance 4a between starting points of closest distances 14a and 14b... Blower 4b... Blowing direction 4c... Cooling sheet 4d... Hot plate 91 Triangular hole 101 Diamond hole 131 Diamond hole

Claims (13)

A sheet having a plurality of holes, wherein X calculated by the following formula is 250 to 1000, and the area of the inscribed circle in at least one of the holes is 2.0 to 64 mm ² .
X=(A×B×L)/C (Formula 1)
In Equation 1 above, A is 1.2 and C is 1.8×10 ⁻⁵ . B takes a value of 0.50 to 7.5, and L is a representative length (m) between the hole and the other hole adjacent thereto and takes a value of 1 ⁻³ to 10 ⁻³ m. . 2. The sheet of claim 1, wherein at least one of said holes is a polygon with three or more corners. 3. The sheet according to claim 1, wherein said plurality of holes are arranged in parallel. The sheet according to any one of claims 1 to 3, wherein at least one of the holes has an area ratio of 7.0% or more. The sheet according to any one of claims 1 to 4, wherein a thread end face is present at the end of at least one of said holes. The sheet according to any one of claims 1 to 5, which has an air permeability of 90.0 cm ³ /cm ² ·s or more according to JIS L1096 (2010) A method. The sheet according to any one of claims 1 to 6, wherein the sheet is a fiber structure. The sheet according to any one of claims 1 to 7, wherein the sheet is a cooling sheet. 9. The sheet according to any one of claims 1 to 8, wherein the sheet is an object to be worn, and the distance between at least a part of the sheet and the skin is 2.0 to 20.0 mm. A textile product comprising at least a part of the sheet according to any one of claims 1 to 9. 11. The textile product according to claim 10, wherein at least a portion thereof contains a portion having an elongation rate of 5% or more. Sundries containing at least a part of the sheet according to any one of claims 1 to 9. The sheet according to any one of claims 1 to 9, wherein a sheet having an air permeability of 150.0 cm ³ /cm ² s or less according to JIS L1096 (2010) A method is used, and a plurality of holes are formed by hole punching. Production method.

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