WO2021250891A1

WO2021250891A1 - Sheet material

Info

Publication number: WO2021250891A1
Application number: PCT/JP2020/023219
Authority: WO
Inventors: 秀明内冨
Original assignee: 株式会社アイ・セラミック・テクノロジー
Priority date: 2020-06-12
Filing date: 2020-06-12
Publication date: 2021-12-16

Abstract

The present invention addresses the problem of providing a sheet material which is capable of imparting a heat insulation property while ensuring air permeability. A sheet material 10 comprises: a sheet-like substrate 1 in which voids are distributed over the entire surface thereof; and a plurality of particulate members 2 which are made of a ceramic material which is formed hollow. The particulate members 2 are retained in the sheet-like substrate 1 without closing off the voids. Since the particulate members 2 are formed by a hollow ceramic material with relatively low heat conductivity, the heat insulation property of the sheet material 10 can be improved. Further, since the particulate members 2 are retained in the sheet-like substrate 1 without closing off the voids which are distributed over the entire surface of the sheet-like substrate 1, air permeability can be ensured across the entire surface of the sheet material 10.

Description

Sheet material

This disclosure relates to sheet materials.

For example, sheet materials used for various purposes such as construction, civil engineering, and packaging with improved heat insulation are known. In order to improve the heat insulating property, it is conceivable to simply make the sheet material thicker. However, if the sheet material becomes too thick, problems such as deterioration of usability may occur. Therefore, as a technique for improving the heat insulating property while suppressing the thickness of the sheet material as much as possible, for example, in Patent Document 1, a sheet member is formed by applying hollow ceramic beads and an acrylic resin to a resin film, and the sheet is concerned. A functional sheet produced by laminating a member to a rubber sheet is disclosed. In this functional sheet, the heat insulating property is improved by hollow ceramic beads having low thermal conductivity.

In addition, in this functional sheet, hollow ceramic beads cover the resin film without gaps, so that water resistance is improved in addition to heat insulation. Moreover, by providing a rubber sheet, further water resistance is added, and even if the rubber sheet is pierced by a nail or the like, the holes are closed by the expansion and contraction of the rubber sheet, and the water resistance is maintained. There is.

Japanese Unexamined Patent Publication No. 2004-25791

By the way, in the functional sheet as described above, since the rubber sheet and the resin film are used as the base material for holding the hollow ceramic beads, it is difficult to secure the air permeability. Moreover, in this functional sheet, the hollow ceramic beads cover the resin film without gaps, so that the air permeability is more likely to decrease.

Therefore, in order to improve the air permeability of the functional sheet as described above, it is conceivable to form a through hole in the functional sheet after the fact by, for example, punching. However, in this case, if the diameter of the through hole is not sufficiently large, the rubber sheet expands and contracts, and the through hole is closed. On the other hand, even if the diameter of the through hole is sufficiently large, the air permeability can be improved in the region directly under the through hole, but the air permeability tends to be insufficient in the region other than the region directly under the through hole.

Therefore, it is an object of the present disclosure to provide a sheet material that can have heat insulating properties while ensuring breathability.

The sheet material (10) according to one aspect of the present disclosure includes a sheet-like base material (1) in which voids (G) are distributed over the entire surface, and a plurality of granular members (2) made of hollow ceramic. , And the granular member (2) is held in the sheet-like base material (1) without closing the voids (G).

According to this sheet material (10), a plurality of granular members (2) held on the sheet-like base material (1) are formed of a hollow ceramic having a relatively low thermal conductivity. Therefore, the heat insulating property of the sheet material (10) can be improved. Further, since the voids (G) are distributed over the entire surface of the sheet-like substrate (1), the sheet-like substrate (1) itself has air permeability, and the granular member is in such a manner that the voids (G) are not closed. (2) is held on the sheet-like base material (1). Therefore, air permeability can be ensured over the entire surface of the sheet material (10). Therefore, this sheet material (10) can have heat insulating properties while ensuring air permeability.

In the sheet material (10) according to one aspect of the present disclosure, the granular member (2) may be formed in a spherical shape. According to this, since the granular member (2) can be held at a high density with respect to the sheet-shaped base material (1), the heat insulating property can be further improved.

In the sheet material (10) according to one aspect of the present disclosure, the granular member (2) may be formed to have a major axis of 5 μm or more and 50 μm or less. According to this, the effect of the present disclosure of providing heat insulating property while ensuring air permeability is more preferably achieved.

In the sheet material (10) according to one aspect of the present disclosure, the granular member (2) may be made of a non-porous member. According to this, it is possible to prevent the internal space of the hollow granular member (2) from communicating with the outside of the granular member (2) through the pores, so that the heat insulating property is more reliably improved. Can be made to.

The sheet material (10) according to one aspect of the present disclosure may include a binder (3) that disperses the granular member (2) inside and holds it on the sheet-like base material (1). According to this, the granular member (2) can be suitably held on the sheet-like base material (1) while achieving both breathability and heat insulating properties.

In the sheet material (10) according to one aspect of the present disclosure, the binder (3) may have a film structure in which the granular member (2) is dispersed inside. As a result, the effect of the present disclosure of imparting heat insulating properties to the sheet material (10) is more preferably achieved.

In the sheet material (10) according to one aspect of the present disclosure, the sheet-like base material (1) may be made of a fiber (F). According to this, it becomes easy to secure the air permeability over the entire surface of the sheet material (10). Further, since the surface area of the fiber (F) is large, it is possible to hold a sufficient amount of the granular member (2) in the fiber (F).

In the sheet material (10) according to one aspect of the present disclosure, the sheet-like base material (1) may be made of a non-woven fabric. According to this, the effect of the present disclosure of providing heat insulating property while ensuring air permeability is more preferably achieved.

In the sheet material (10) according to one aspect of the present disclosure, the granular member (2) is a base material internal region (1c) which is a region corresponding to the inside of the sheet-like base material (1) on the surface of the fiber (F). ), The fiber (F) is held at a higher density in the base material surface region (1d), which is a region corresponding to the surface of the sheet-like base material (1) on the surface of the fiber (F). May be good. According to this, since the granular member (2) is intensively arranged in the substrate surface region (1d), the void (G) in the substrate internal region (1c) is less likely to be occupied by the granular member (2). Therefore, it becomes easier to secure the air permeability.

In the sheet material (10) according to one aspect of the present disclosure, the granular member (2) is a base material internal region (1c) which is a region corresponding to the inside of the sheet-like base material (1) on the surface of the fiber (F). ) And the base material surface region (1d), which is a region corresponding to the surface of the sheet-like base material (1) on the surface of the fiber (F), held on the fiber (F) so as to have the same density. It may have been done. According to this, the granular member (2) is evenly arranged in the base material surface region (1d) and the base material internal region (1c), so that the base material surface region (1d) is formed by contact with other members, for example. Even when the granular member (2) arranged in the base material is scraped off, a sufficient amount of the granular member (2) remains in the substrate internal region (1c). Therefore, it is possible to suppress the deterioration of the heat insulating property.

Note that the reference numerals in the above parentheses indicate the reference numerals of the components in the embodiments described later as an example of the present disclosure, and the present disclosure is not limited to the embodiment of the present disclosure.

As described above, the sheet material according to the present disclosure can have heat insulating properties while ensuring breathability.

FIG. 1 is a perspective view showing the appearance of the sheet material according to the present embodiment. FIG. 2 is an enlarged view showing a non-woven fabric as a sheet-like base material. FIG. 3 is a diagram showing a microscope image of a granular member. FIG. 4 is a diagram showing a microscope image of a granular member. FIG. 5 is a diagram schematically showing a state in which granular members are dispersed inside a binder having a film structure. FIG. 6 is a cross-sectional view showing a sheet material.

Hereinafter, an exemplary embodiment will be described with reference to the drawings. The same or corresponding parts in each figure are designated by the same reference numerals, and duplicate description will be omitted.

[First Embodiment]
FIG. 1 is a perspective view showing the appearance of the sheet material 10 according to the present embodiment. FIG. 2 is an enlarged view showing a non-woven fabric as a sheet-shaped base material 1. 3 and 4 are views showing microscopic images of the granular member 2. FIG. 5 is a diagram schematically showing a state in which the granular members 2 are dispersed inside the binder 3 having a film structure. As shown in FIGS. 1 to 5, the sheet material 10 is a sheet having high heat insulating properties, and has breathability over the entire surface thereof. Further, the sheet material 10 has flexibility.

Here, "having high heat insulating property" tends to have high heat insulating property (that is, low thermal conductivity) as compared with, for example, cloth, paper, resin film, non-woven fabric, etc., which are general sheet materials. It means that. "Having breathability" means that it is breathable (that is, air can flow) through the sheet material 10. In addition, "air" may mean gas in general, and may contain water vapor. Further, "having flexibility" means that it can be easily bent in any direction at any position. The sheet material 10 is used here as wallpaper for construction. The use of the sheet material 10 is not limited to the wallpaper for construction, and can be applied to various uses as described later.

The sheet material 10 is a thin sheet-like member having a substantially constant thickness over the entire surface thereof. The sheet material 10 has a first surface 10a and a second surface 10b on the opposite side of the first surface 10a. The sheet material 10 may have a thickness of, for example, 0.1 mm or more and 2 mm or less over the entire surface thereof. With such a thickness, it becomes easy to achieve a suitable balance in functions such as heat insulation, breathability, flexibility, durability, and ease of manufacture of the sheet material 10. Although the sheet material 10 has a rectangular shape as a whole here, the shape is not limited to the rectangular shape, and the sheet material 10 can be appropriately cut or preformed into a shape suitable for the intended use.

The sheet material 10 includes a sheet-like base material 1, a granular member 2, and a binder 3. The sheet material 10 may further have a separate configuration in addition to the sheet-like base material 1, the granular member 2, and the binder 3. For example, the sheet material 10 may further include a separate sheet having breathability so as to cover the first surface 10a or the second surface 10b. Alternatively, the sheet material 10 may further comprise a separate mixture present dispersed within the binder 3.

The sheet-shaped base material 1 is a member that serves as a base material for the sheet material 10, and has an outer shape that substantially matches the outer shape of the sheet material 10. That is, the sheet-like base material 1 is a thin sheet-like member having a substantially constant thickness over the entire surface thereof. The sheet-shaped substrate 1 has a first surface 1a and a second surface 1b opposite to the first surface 1a. The first surface 1a of the sheet-shaped base material 1 is a surface corresponding to the first surface 10a of the sheet material 10. Further, the second surface 1b of the sheet-shaped base material 1 is a surface corresponding to the second surface 10b of the sheet material 10. The sheet-like base material 1 may have a thickness of, for example, 0.1 mm or more and 2 mm or less over the entire surface thereof, and this thickness substantially coincides with the thickness of the sheet material 10. The sheet-shaped base material 1 has a rectangular shape as a whole here, but the shape is not limited to the rectangular shape, and the sheet-shaped base material 1 can be appropriately cut or preformed into a shape suitable for the intended use.

The sheet-like base material 1 has air permeability over the entire surface thereof. That is, the sheet-shaped base material 1 is formed with a gap G that communicates the first surface 1a and the second surface 1b. The voids G are formed so as to be distributed over the entire surface of the sheet-like base material 1. The void G is formed to have a size that allows ventilation between the first surface 1a and the second surface 1b of the sheet-like base material 1. The gap G may have a width of, for example, 0.1 mm or more and 1 mm or less. The fact that water vapor can flow through the void G as air means that the sheet-like base material 1 has a moisture permeability to allow moisture to escape.

The sheet-like base material 1 is composed of a member made of fibers here. More specifically, the sheet-like base material 1 is made of a non-woven fabric. The "nonwoven fabric" is formed into a sheet without weaving fibers, and is formed by, for example, entwining the fibers with each other. In the non-woven fabric as the sheet-like base material 1, the gaps between the fibers entwined with each other are voids G.

The fibers used as the material of the non-woven fabric constituting the sheet-shaped base material 1 are not particularly limited. For example, the fiber used as the material of the non-woven fabric constituting the sheet-shaped base material 1 may be any fiber such as aramid fiber, glass fiber, nylon fiber, vinylon fiber, polypropylene fiber, polyethylene fiber, polyester fiber, cellulose fiber and the like. .. Further, the sheet-like base material 1 is not limited to the non-woven fabric as long as it is a sheet-like member in which the voids G are distributed over the entire surface. That is, the sheet-like base material 1 may be a member other than the non-woven fabric and may be made of a member made of fibers, or may be made of a member other than the fibers.

The granular member 2 is a fine grain made of a hollow ceramic. Since the granular member 2 is formed hollow, the heat capacity per unit volume (that is, the volume specific heat) is close to that of air. A plurality (many) of the granular members 2 are included in the sheet material 10. The granular member 2 has a spherical outer shape. Here, the "spherical shape" is exemplified by a true spherical shape, but the spherical shape is not necessarily limited to the true spherical shape, and may be, for example, an oblate spherical shape. Further, the granular member 2 may have a more distorted shape. The granular member 2 is formed so that the major axis of the outer shape is preferably 1 μm or more, more preferably 5 μm or more. Further, the granular member 2 is formed so that the major axis of the outer shape is preferably 100 μm or less, more preferably 50 μm or less.

The type of ceramic constituting the granular member 2 is not particularly limited, but may be, for example, a ceramic made of sodium aluminosilicate glass. Further, the granular member 2 may be made of a non-porous member. By forming the granular member 2 with such a ceramic, the sheet material 10 can particularly preferably suppress the growth of fungi, mold and the like. That is, the sheet material 10 provided with the granular member 2 is expected to have antibacterial, antifungal, and deodorant effects. Further, by forming the granular member 2 with the inorganic ceramic, the sheet material 10 is suppressed from being charged with static electricity, and as a result, dust, pollen and the like are less likely to adhere. Further, by forming the granular member 2 with ceramic, the temperature environment in the vicinity of the sheet material 10 is stabilized by the heat storage function of the ceramic, and for example, the growth of plants placed in the vicinity of the sheet material 10 can be promoted.

The binder 3 is for binding the plurality of granular members 2 to each other, and the granular members 2 and the sheet-like base material 1 to each other (that is, a binder). The binder 3 thinly intervenes between the plurality of granular members 2 and adheres them to each other. Further, the binder 3 is thinly interposed between the granular member 2 and the sheet-like base material 1, and adheres them to each other. That is, the binder 3 disperses the granular member 2 inside and holds it on the sheet-shaped base material 1. In other words, the granular member 2 is held on the sheet-like base material 1 via the binder 3. Here, "retention" means, for example, a state in which the granular member 2 is firmly bonded to the sheet-like base material 1, a state in which the sheet-like base material 1 is adhered to the granular member 2, or a state in which the sheet-like base material 1 is adhered to the granular member 2. May mean various aspects such as a state in which the granular member 2 is attached to the granular member 2 via another member.

The binder 3 has a film structure in which the granular member 2 is dispersed inside. In particular, the binder 3 may uniformly disperse the granular member 2 inside. The film structure composed of the binder 3 may have a thickness of, for example, about 0.5 mm. Of such films, 90% or more of the volume is composed of the granular member 2 (that is, less than 10% of the volume is composed of the binder 3). The binder 3 having a film structure covers, for example, the surface of the fiber F of the sheet-like substrate 1 as a film. The binder 3 is made of, for example, silicon acrylic or the like. When the binder 3 is composed of a material (inactivating component) that does not supply nutrients to microorganisms, long-term antibacterial and antifungal functions can be realized. In the manufacturing process of the sheet material 10 described later, the binder 3 is in a liquid or gel state before drying, and changes to a flexible solid state after drying.

Subsequently, an embodiment in which the granular member 2 is held by the sheet-shaped base material 1 will be described. The granular member 2 (and the binder 3) is held on at least a part of the surface of the fiber F constituting the sheet-like base material 1. That is, the granular member 2 may be held on the sheet-like base material 1 in an amount that at least the sheet material 10 can obtain sufficient heat insulating properties. The granular member 2 is held by the sheet-like base material 1 without closing the gap G. That is, the amount of the granular member 2 that fills all the gaps G between the fibers F constituting the sheet-shaped base material 1 is not held in the sheet-shaped base material 1. At this time, the binder 3 also covers the fibers F of the sheet-like base material 1 so as not to block the gap G.

For example, the granular member 2 may form a layer thinner than the width of the void G, which is the gap between the fibers F constituting the sheet-like base material 1 (that is, the film structure of the binder 3 is the width of the void G). May be thinner than.). Alternatively, the granular member 2 may be sparsely held on the surface of the fiber F constituting the sheet-like base material 1.

FIG. 6 is a cross-sectional view showing the sheet material 10. As shown in FIG. 6, in the sheet material 10, the granular members 2 are distributed at the following densities with respect to each portion of the sheet-like base material 1. The granular members 2 are distributed at a higher density in the base material surface region 1d than in the base material internal region 1c of the sheet-like base material 1. The “base material internal region 1c” means a region corresponding to the inside of the sheet-shaped base material 1 on the surface of the fiber F of the sheet-shaped base material 1. Further, the “base material surface region 1d” means a region corresponding to the surface of the sheet-like base material 1 in the surface of the fiber F of the sheet-like base material 1. Here, the "surface of the fiber F" means the outer surface of each fiber F. Further, the "surface of the sheet-like base material 1" is the outer surface of the sheet-like base material 1 when viewed as a whole of the sheet-like base material 1, and specifically, the first surface 1a of the sheet-like base material 1 is used. And the second surface 1b are exemplified.

In other words, the granular member 2 has a high density in the base material surface region 1d of the sheet-shaped base material 1 as compared with the base material internal region 1c of the sheet-shaped base material 1 on the surface of the fiber F. It is held in F. Here, "high density" may mean, for example, that the coverage ratio, which is the ratio of the area covered by the granular member 2 on the surface of the fiber F, is relatively high. Alternatively, "high density" means, for example, the granular member 2 held per unit area of the surface of the fiber F regardless of the coverage ratio, which is the ratio of the area covered by the granular member 2 on the surface of the fiber F. It may mean that the number is large. That is, in this case, if the coverage of the granular members 2 is the same, the higher the number of the granular members 2 overlapped and held (that is, held in multiple layers) on the surface of the fiber F, the higher the density. Become.

Subsequently, a method for manufacturing the sheet material 10 will be described. First, a ceramic paint in a wet state binder 3 containing a granular member 2 and a sheet-like base material 1 which is a roll-shaped base paper are prepared (raw material preparation step). Next, the ceramic paint is evenly applied to the first roller (roller coating step). At this time, the amount of the ceramic paint applied to the first roller may be, for example, about ^{120 g / m 2.} With this amount, when the ceramic paint is transferred to the sheet-shaped base material 1 in the step described later, the ceramic paint is less likely to close the void G of the sheet-shaped base material 1. Next, the sheet-shaped base material 1 wound in a roll shape is unwound, hung on the first roller coated with the ceramic paint, and then wound up by another second roller. As a result, the ceramic paint applied to the first roller is transferred to the sheet-like base material 1. When the ceramic paint is transferred to the sheet-like base material 1 in this way, the amount of the ceramic paint applied to the first roller is reduced, so that new ceramic paint is supplied (coated) to the first roller at any time. To. When the sheet-like base material 1 is wound around the second roller, for example, the sheet-like base material 1 is dried at a drying temperature of 60 degrees and wound up on the second roller at a speed of about 20 m / min, so that it is in a wet state. The existing ceramic paint is suitably dried in a state of being transferred to the sheet-like base material 1, and the sheet material 10 is completed. After that, the sheet material 10 may be cut into an appropriate shape and size.

As described above, in the sheet material 10, the granular member 2 made of a hollow spherical ceramic is uniformly dispersed inside the binder 3 having a film structure, and is a breathable sheet-like group. It is processed into the material 1 (that is, it is held on the surface of the fiber F constituting the sheet-like base material 1). Since the granular member 2 is formed hollow, the heat capacity per unit volume (that is, the volume specific heat) is close to that of air. Therefore, the sheet material 10 in which the granular member 2 is processed into the sheet-like base material 1 tends to have the same temperature as the surrounding air, and as a result, dew condensation (water droplets) is less likely to occur on the sheet material 10.

Further, in the sheet material 10, since the granular member 2 is made of an inorganic ceramic, static electricity is suppressed. Therefore, it is difficult for fine foreign substances such as dust and pollen to adhere to the sheet material 10.

The sheet material 10 includes a sheet-like base material 1 in which voids G are distributed over the entire surface, and a plurality of granular members 2 made of ceramics formed in the hollow, and the granular members 2 are formed on the sheet-like base material 1. , The void G is held without being blocked.

According to the sheet material 10, the plurality of granular members 2 held on the sheet-like base material 1 are formed of a hollow ceramic having a relatively low thermal conductivity. Therefore, the heat insulating property of the sheet material 10 can be improved. Further, since the voids G are distributed over the entire surface of the sheet-like substrate 1, the sheet-like substrate 1 itself has air permeability, and the granular member 2 is attached to the sheet-like substrate 1 in such a manner that the voids G are not blocked. It is being held. Therefore, air permeability can be ensured over the entire surface of the sheet material 10. Therefore, the sheet material 10 can be provided with heat insulating properties while ensuring air permeability.

In the sheet material 10, the granular member 2 is formed in a spherical shape. As a result, the granular member 2 can be held at a high density with respect to the sheet-shaped base material 1, so that the heat insulating property can be further improved.

In the sheet material 10, the granular member 2 is formed to have a major axis of 5 μm or more and 50 μm or less. As a result, the effect of the present disclosure of providing heat insulating properties while ensuring air permeability is more preferably achieved.

In the sheet material 10, the granular member 2 is made of a non-porous member. As a result, it is possible to prevent the internal space of the granular member 2 formed in the hollow from communicating with the outside of the granular member 2 through the pores, so that the heat insulating property can be improved more reliably.

The sheet material 10 is provided with a binder that disperses the granular member 2 inside and holds it on the sheet-like base material 1. As a result, the granular member 2 can be suitably held on the sheet-like base material 1 while achieving both breathability and heat insulating properties.

The binder 3 has a film structure in which the granular member 2 is dispersed inside. As a result, the effect of the present disclosure of imparting heat insulating properties to the sheet material 10 is more preferably achieved.

In the sheet material 10, the sheet-like base material 1 is made of fiber F. This makes it easy to ensure air permeability over the entire surface of the sheet material 10. Further, since the surface area of the fiber F is large, it is possible to hold a sufficient amount of the granular member 2 in the fiber F.

In the sheet material 10, the sheet-like base material 1 is made of a non-woven fabric. As a result, the effect of the present disclosure of providing heat insulating properties while ensuring air permeability is more preferably achieved.

In the sheet material 10, the granular member 2 has a sheet-like base material 1 on the surface of the fiber F as compared with a base material internal region 1c, which is a region corresponding to the inside of the sheet-like base material 1 on the surface of the fiber F. It is held by the fiber F at a high density in the base material surface region 1d, which is a region corresponding to the surface of the above. As a result, the granular member 2 is centrally arranged in the base material surface region 1d, so that the void G in the base material internal region 1c is less likely to be occupied by the granular member 2, and thus it becomes easier to secure air permeability.

[Second Embodiment]
The sheet material 10A according to the second embodiment is different from the sheet material 10 according to the first embodiment in the density in which the granular member 2 is distributed in each part of the sheet-like base material 1, and other points. The same is true for. Hereinafter, the configuration of the sheet material 10A will be mainly described as being different from the sheet material 10.

In the sheet material 10A, the granular members 2 are distributed at a uniform density regardless of the region of the sheet-like base material 1. In other words, in the sheet material 10A, the granular member 2 has the same density in the base material internal region 1c of the sheet-like base material 1 and the base material surface region 1d of the sheet-like base material 1 on the surface of the fiber F. It is held by the fiber F so as to be. Here, "equal density" may mean, for example, that the coverage ratio, which is the ratio of the area covering the surface of the fiber F, is the same. Alternatively, "equal density" means, for example, the granular member 2 held per unit area of the surface of the fiber F regardless of the coverage ratio, which is the ratio of the area covered by the granular member 2 on the surface of the fiber F. It may mean that the number of is equal.

According to the sheet material 10A, the granular member 2 is evenly arranged in the base material surface region 1d and the base material internal region 1c, so that the granular member 2 is arranged in the base material surface region 1d by contact with another member, for example. Even when 2 is scraped off, a sufficient amount of granular member 2 remains in the substrate internal region 1c. Therefore, it is possible to suppress the deterioration of the heat insulating property.

[Modification example]
The above-described embodiments can be implemented in various embodiments that have been modified or improved based on the knowledge of those skilled in the art.

For example, in the above embodiment, the sheet materials 10 and 10A are applied to the wallpaper for construction. However, the sheet materials 10 and 10A are not limited to the wallpaper for construction, and may be applied to a large structure such as a ceiling of a building, an air conditioning duct, or a ceiling of an automobile. Alternatively, the sheet materials 10 and 10A may be applied to materials that support human health, such as helmets, hats, clothing, masks, shoe insoles, zafu, and bed sheets.

Claims

A sheet-like base material in which voids are distributed over the entire surface,
With a plurality of granular members made of ceramic formed in the air,
The granular member is a sheet material in which the gap is held by the sheet-like base material without closing the voids.
The sheet material according to claim 1, wherein the granular member is formed in a spherical shape.
The sheet material according to claim 1 or 2, wherein the granular member has a major axis of 5 μm or more and 50 μm or less.
The sheet material according to any one of claims 1 to 3, wherein the granular member is a non-porous member.
The sheet material according to any one of claims 1 to 4, further comprising a binder for dispersing the granular member inside and holding the granular member on the sheet-like substrate.
The sheet material according to claim 5, wherein the binder has a film structure in which the granular members are dispersed inside.
The sheet material according to any one of claims 1 to 6, wherein the sheet-like base material is made of fibers.
The sheet material according to claim 7, wherein the sheet-like base material is made of a non-woven fabric.
The granular member is a region of the surface of the fiber corresponding to the surface of the sheet-like base material as compared with a region of the surface of the fiber corresponding to the inside of the sheet-like base material. The sheet material according to claim 7 or 8, which is held by the fiber at a high density in the surface region of the base material.
The granular member is a group which is a region corresponding to the inside of the sheet-like base material on the surface of the fiber and a region corresponding to the surface of the sheet-like base material on the surface of the fiber. The sheet material according to claim 7 or 8, which is held by the fiber so that the density becomes equal to that of the material surface region.