JP7623583B2 - Inorganic fiber fabric for architectural membrane materials and architectural membrane materials - Google Patents

Description

The present invention relates to inorganic fiber fabrics for architectural membrane materials and architectural membrane materials.

Conventionally, a non-flammable sheet containing a glass fiber fabric and a coating resin that covers both the front and back sides of the glass fiber fabric has been known as a membrane material for buildings or structures (hereinafter referred to as architectural membrane material) (see, for example, Patent Document 1).

However, even if the conventional non-combustible sheets can be certified as non-combustible in terms of heat generation, there is a risk that the glass fiber fabric in the non-combustible sheet will be damaged if heated at high temperatures for a long period of time. For this reason, particularly when the non-combustible sheet is used as a ceiling material, there is a risk that the non-combustible sheet will fall due to damage to the glass fiber fabric in the event of a fire, and it cannot be said that the sheet necessarily has sufficient fire resistance.

On the other hand, refractory materials containing woven alumina fibers are known (see, for example, Patent Document 2).

JP 2018-84097 A JP 2000-331546 A

Therefore, it is believed that by using the above-mentioned alumina fiber fabric instead of the glass fiber fabric of the conventional non-combustible sheet, it is possible to obtain a building membrane material with sufficient fire resistance.

However, the alumina fiber fabric is inferior to glass fiber fabric in weaving properties, and a sheet material containing the alumina fiber fabric and a coating resin that covers both the front and back sides of the alumina fiber fabric has the disadvantage that it does not have sufficient strength to be used as a building membrane material.

The present invention aims to provide an inorganic fiber fabric for architectural membrane materials, which overcomes these disadvantages and has excellent heat resistance, excellent weaving properties, and high suitability for use as architectural membrane materials, and an architectural membrane material using the inorganic fiber fabric for architectural membrane materials.

In order to achieve this object, the present invention provides an inorganic fiber fabric for architectural membrane materials, characterized in that the average _Al2O3 content At of the warp yarns constituting the inorganic fiber fabric and the average _Al2O3 content Ay of the weft _yarns constituting the inorganic fiber fabric are each in the range of _17.5 mass% or more, the mass Tt per unit length of the warp yarns constituting the inorganic fiber fabric and the mass Ty per unit length of the weft yarns constituting the inorganic fiber fabric are each in the range of 100 to 600 g/1000 m, the weave density Wt of the warp yarns constituting the inorganic fiber fabric and the weave density Wy of the weft yarns constituting the inorganic fiber fabric are each in the range of 10.0 to 55.0 yarns/25 mm, the ratio of Tt to Ty (Tt/Ty) is in the range of 0.66 to 1.50, and the At, Ay, Tt, Ty, Wt and Wy satisfy the following formula (1).
316.5≦Wt ^1/3 ×Tt ^1/2 / (At/100) + Wy ^1/3 ×Ty ^1/2 / (Ay/100)≦550.0 ... (1)

The inorganic fiber fabric for architectural membrane materials of the present invention has excellent heat resistance, excellent weaving properties, and high suitability as architectural membrane materials because At, Ay, Tt, Ty, Wt, and Wy are within the above ranges and further satisfy formula (1).

Here, the term "excellent heat resistance" means that a sample carrying a 100 mm diameter 10 kg weight is placed in a muffle furnace, the temperature inside the furnace is raised to 800°C so that it follows the standard heating temperature curve of ISO 834, and the sample is not damaged when cooled down in three times the time required for the temperature rise. The term "excellent weaving property" means that no slack, fluff, or breakage of the thread occurs during warping or weft weaving. The term "high suitability for an inorganic fiber fabric as a building membrane material" means that a test piece cut to a width of 25 mm and a length of 150 mm in both the vertical and horizontal directions is prepared and evaluated by a tensile test conforming to JIS L 1096:2010, and the tensile strength is 2000 N/25 mm or more.

In the inorganic fiber fabric for architectural membrane material of the present invention, it is preferable that At, Ay, Tt, Ty, Wt and Wy satisfy the following formula (2).
346.0≦Wt ^1/3 ×Tt ^1/2 / (At/100) + Wy ^1/3 ×Ty ^1/2 / (Ay/100)≦464.0 ... (2)

The inorganic fiber fabric for architectural membrane materials of the present invention has even better heat breakage resistance, excellent weaving properties, and even higher suitability as architectural membrane materials because At, Ay, Tt, Ty, Wt, and Wy satisfy formula (2).

Here, the inorganic fiber fabric for architectural membrane material has even better heat breakage resistance when a sample with a 10 kg weight and a diameter of 100 mm is placed in a muffle furnace, the temperature inside the furnace is raised to 800°C so that the temperature is in line with the standard heating temperature curve of ISO834, and the temperature is lowered in three times the time required for heating, the sample is not damaged, and when a test piece is cut to a width of 25 mm and a length of 150 mm in both the vertical and horizontal directions and evaluated in a tensile test conforming to JIS L 1096:2010, the tensile strength is 450 N/25 mm or more. In addition, the inorganic fiber fabric for architectural membrane material has even higher architectural membrane material suitability when a test piece is cut to a width of 25 mm and a length of 150 mm in both the vertical and horizontal directions and evaluated in a tensile test conforming to JIS L 1096:2010, the tensile strength is 3000 N/25 mm or more.

In the inorganic fiber fabric for architectural membrane material of the present invention, it is preferable that At, Ay, Tt, Ty, Wt and Wy satisfy the following formula (3).
316.5≦(Tt/Ty) {Wt ^1/3 ×Tt ^1/2 /(At/100)+Wy ^1/3 ×Ty ^1/2 /(Ay/100)}≦550.0...(3)

The inorganic fiber fabric for architectural membrane materials of the present invention has excellent heat resistance, excellent weaving properties, and high suitability as architectural membrane materials because At, Ay, Tt, Ty, Wt, and Wy satisfy formula (3).

In the inorganic fiber fabric for architectural membrane material of the present invention, it is preferable that At, Ay, Tt, Ty, Wt and Wy satisfy the following formula (4).
346.0≦(Tt/Ty) {Wt ^1/3 ×Tt ^1/2 / (At/100) + Wy ^1/3 ×Ty ^1/2 / (Ay/100)}≦464.0 ... (4)

The inorganic fiber fabric for architectural membrane materials of the present invention can have even better heat breakage resistance, excellent weaving properties, and even higher suitability as architectural membrane materials because At, Ay, Tt, Ty, Wt, and Wy satisfy formula (4).

The architectural membrane material of the present invention is characterized by comprising any one of the inorganic fiber fabrics for architectural membrane materials described above and a coating resin that coats both the front and back sides of the inorganic fiber fabric for architectural membrane materials.

Next, we will explain the embodiment of the present invention in more detail.

In this embodiment, the inorganic fiber fabric for architectural membrane materials has an average _Al2O3 content At of the warp yarns constituting _the inorganic fiber fabric and _an average _Al2O3 content Ay of the weft yarns constituting the inorganic fiber fabric, each in the range of 17.5 mass% or more, a mass Tt per unit length of the warp yarns constituting the inorganic fiber fabric and a mass Ty per unit length of the weft yarns constituting the inorganic fiber fabric, each in the range of 100 to 600 g/1000 m, a weave density Wt of the warp yarns constituting the inorganic fiber fabric and a weave density Wy of the weft yarns constituting the inorganic fiber fabric, each in the range of 10.0 to 55.0 yarns/25 mm, a ratio of Tt to Ty (Tt/Ty) in the range of 0.66 to 1.50, and the At, Ay, Tt, Ty, Wt and Wy satisfy the following formula (1).
316.5≦Wt ^1/3 ×Tt ^1/2 / (At/100) + Wy ^1/3 ×Ty ^1/2 / (Ay/100)≦550.0 ... (1)

Regarding the average _Al2O3 content At of the warp _yarns constituting the inorganic fiber fabric and the average _Al2O3 content Ay of the weft yarns constituting the inorganic _fiber fabric, for example, when the warp yarns are formed by combining or twisting together n types of inorganic _fiber yarns having different _Al2O3 contents, the average _Al2O3 content of the warp yarns can be calculated by At = ΣAti x _Tti /ΣTti (where i and n are integers of 1 or more, and i≦n), where Ati is the _Al3O3 content (mass %) of the i- _th type of inorganic fiber yarn and Tti is the mass per unit length (g/1000 m).

The At and Ay contents are preferably in the range of 17.5 to 35.0 mass%, more preferably in the range of 20.5 to 30.0 mass%, and even more preferably in the range of 23.5 to 28.0 mass%.

The inorganic fiber yarn _may contain, for example, SiO _{2 in} the range of 40.0 to 80.0 mass%, preferably in the range of 50.0 to 75.0 mass%, more preferably in the range of 60.0 to 70.0 mass%, even more preferably in the range of 61.0 to 69.0 mass%, and particularly preferably in the range of 63.5 to 66.5 mass%, in addition to Al 2 O 3. The inorganic fiber yarn may also contain CaO and MgO in the range of 5.0 to 20.0 mass%, preferably in the range of 7.5 to 15.0 mass%, and more preferably in the range of 8.5 to 11.5 mass% in total.

The mass per unit length Tt of the warp yarns constituting the inorganic fiber fabric and the mass per unit length Ty of the weft yarns constituting the inorganic fiber fabric are preferably in the range of 136 to 540 g/1000 m, more preferably in the range of 180 to 450 g/1000 m, even more preferably in the range of 226 to 425 g/1000 m, particularly preferably in the range of 250 to 420 g/1000 m, and most preferably in the range of 256 to 350 g/1000 m.

The weave density Wt of the warp yarns constituting the inorganic fiber woven fabric is preferably in the range of 12.0 to 36.0 threads/25 mm, more preferably in the range of 15.0 to 30.0 threads/25 mm, even more preferably in the range of 17.0 to 25.0 threads/25 mm, and particularly preferably in the range of 18.3 to 24.7 threads/25 mm. The weave density Wy of the weft yarns constituting the inorganic fiber woven fabric is preferably in the range of 12.0 to 36.0 threads/25 mm, more preferably in the range of 15.0 to 30.0 threads/25 mm, even more preferably in the range of 17.0 to 25.0 threads/25 mm, especially preferably in the range of 18.3 to 24.7 threads/25 mm, and most preferably in the range of 18.4 to 19.9 threads/25 mm.

The ratio of Tt to Ty (Tt/Ty) is preferably in the range of 0.75 to 1.34, more preferably in the range of 0.80 to 1.25, and even more preferably in the range of 0.90 to 1.12.

The inorganic fiber yarn constituting the inorganic fiber fabric for architectural membrane materials of this embodiment is preferably a ply yarn formed by twisting together 2 to 120 identical inorganic fiber yarns, more preferably a ply yarn formed by twisting together 5 to 90 identical inorganic fiber yarns, even more preferably a ply yarn formed by twisting together 8 to 50 identical inorganic fiber yarns, and particularly preferably a ply yarn formed by twisting together 10 to 20 identical inorganic fiber yarns.

It is also preferable that the inorganic fiber yarns constituting the inorganic fiber fabric are not bulky processed.

The inorganic fiber yarns constituting the inorganic fiber fabric for architectural membrane materials of this embodiment can include glass fiber yarns, glass fiber ply yarns (ply yarns formed by twisting the same glass fiber yarns together), ceramic fiber yarns, ceramic fiber ply yarns, ply yarns of multiple types of glass fiber yarns, ply yarns of multiple types of ceramic fiber yarns, ply yarns of glass fiber yarns and ceramic fiber yarns, ply yarns of glass fiber yarns and alumina fiber yarns, ply yarns of ceramic fiber yarns and alumina fiber yarns, etc., but glass fiber yarns or glass fiber ply yarns are preferred because of their excellent weaving properties, and glass fiber ply yarns are more preferred because of their excellent tensile strength and high suitability for architectural membrane material applications.

When the inorganic fiber yarns constituting the inorganic fiber fabric are glass fiber yarns or glass fiber twisted yarns, the filament diameter of the glass filaments constituting the glass fiber yarns or glass fiber twisted yarns is, for example, in the range of 2.5 to 21.0 μm, preferably in the range of 3.0 to 13.0 μm, and more preferably in the range of 3.0 to 9.0 μm.

When the inorganic fiber yarn constituting the inorganic fiber fabric is a glass fiber yarn or a glass fiber twisted yarn, the number of glass filaments constituting the glass fiber yarn or the glass fiber twisted yarn is, for example, in the range of 150 to 20,000, preferably in the range of 600 to 18,000, more preferably in the range of 1,000 to 15,000, even more preferably in the range of 1,500 to 10,000, particularly preferably in the range of 1,800 to 9,000, especially preferably in the range of 2,000 to 8,000, and most preferably in the range of 2,200 to 7,500.

The mass per unit area of the inorganic fiber fabric for architectural membrane materials of this embodiment is, for example, in the range of 310 to 750 g/ ^m2 , preferably in the range of 410 to 650 g/ ^m2 , more preferably in the range of 420 to 550 g/ ^m2 , and particularly preferably in the range of 425 to 490 g/ ^m2 .

Examples of weave patterns of the inorganic fiber fabric include plain weave, twill weave, satin weave, basket weave, and rib weave.

In the inorganic fiber fabric for architectural membrane materials of this embodiment, it is preferable that At, Ay, Tt, Ty, Wt and Wy satisfy the following formula (2), and it is more preferable that they satisfy the following formula (5).
346.0≦Wt ^1/3 ×Tt ^1/2 / (At/100) + Wy ^1/3 ×Ty ^1/2 / (Ay/100)≦464.0 ... (2)
358.0≦Wt ^1/3 ×Tt ^1/2 / (At/100) + Wy ^1/3 ×Ty ^1/2 / (Ay/100)≦418.0 (5)

In addition, in the inorganic fiber fabric for architectural membrane materials of this embodiment, it is more preferable that At, Ay, Tt, Ty, Wt, and Wy satisfy the following formula (3), particularly preferably the following formula (4), and most preferably the following formula (6).
316.5≦(Tt/Ty) {Wt ^1/3 ×Tt ^1/2 /(At/100)+Wy ^1/3 ×Ty ^1/2 /(Ay/100)}≦550.0...(3)
346.0≦(Tt/Ty) {Wt ^1/3 ×Tt ^1/2 / (At/100) + Wy ^1/3 ×Ty ^1/2 / (Ay/100)}≦464.0 ... (4)
358.0≦(Tt/Ty) {Wt ^1/3 ×Tt ^1/2 / (At/100) + Wy ^1/3 ×Ty ^1/2 / (Ay/100)}≦418.0 (6)

The inorganic fiber fabric for architectural membrane materials of this embodiment may have a surface treatment agent of a silane coupling agent, starch, or lubricant attached to its surface in a proportion of 0.3 to 2.5 mass % relative to the mass of the inorganic fiber fabric for architectural membrane materials of this embodiment that includes the surface treatment agent.

Silane coupling agents include aminosilanes (γ-aminopropyltriethoxysilane, N-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, N-β-(aminoethyl)-N'-β-(aminoethyl)-γ-aminopropyltrimethoxysilane, γ-anilinopropyltrimethoxysilane, etc.), chlorosilanes (γ-chloropropyltrimethoxysilane, etc.), epoxysilanes (γ-glycidoxypropyltrimethoxysilane, β-(3,4-epoxycyclohexyl)ethyltrimethoxysilane, Examples of the silane coupling agent include silanes such as mercaptosilanes (γ-mercaptotrimethoxysilane, etc.), vinylsilanes (vinyltrimethoxysilane, N-β-(N-vinylbenzylaminoethyl)-γ-aminopropyltrimethoxysilane, etc.), acrylsilanes (γ-methacryloxypropyltrimethoxysilane, etc.), and cationic silanes (N-(vinylbenzyl)-2-aminoethyl-3-aminopropyltrimethoxysilane hydrochloride, N-phenyl-3-aminopropyltrimethoxysilane hydrochloride, etc.). These compounds can be used alone as the silane coupling agent, or two or more of them can be used in combination.

Examples of starches include corn starch, potato starch, rice starch, tapioca starch, wheat starch, sweet potato starch, high amylose corn starch, sago starch, and starches that have been subjected to processing such as etherification, esterification, grafting, crosslinking, etc. These starches can be used alone or in combination of two or more types.

Examples of lubricants include modified silicone oils, animal oils (beef tallow, etc.) and their hydrogenated products, vegetable oils (soybean oil, coconut oil, rapeseed oil, palm oil, castor oil, etc.) and their hydrogenated products, animal waxes (beeswax, lanolin, etc.), vegetable waxes (candelilla wax, carnauba wax, etc.), mineral waxes (paraffin wax, montan wax, etc.), condensates of higher saturated fatty acids and higher saturated alcohols (stearic acid esters such as lauryl stearate, etc.), polyethyleneimine, polyalkylpolyamine alkylamide derivatives, fatty acid amides (for example, dehydration condensates of polyethylene polyamines such as diethylenetriamine, triethylenetetramine, tetraethylenepentamine, etc., and fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, etc.), and quaternary ammonium salts (alkyltrimethylammonium salts such as lauryltrimethylammonium chloride, etc.). The lubricants can be used alone or in combination of two or more types.

The architectural membrane material of this embodiment includes any one of the inorganic fiber fabrics for architectural membrane materials described above and a coating resin that coats both the front and back sides of the inorganic fiber fabric for architectural membrane materials.

Examples of the coating resin include fluorine-based resins and silicone resins. Examples of the fluorine-based resins include polytetrafluoroethylene (PTFE), perfluoroalkoxyalkane (PFA), tetrafluoroethylene-hexafluoropropylene copolymer (FEP), tetrafluoroethylene-ethylene copolymer (ETFE), polyvinylidene fluoride (PVDF), polychlorotrifluoroethylene (PCTFE), tetrafluoroethylene-perfluorodioxysol copolymer (TFE/PDD), polyvinyl fluoride (PVF), etc.

The coating resin may be a resin composition containing additives such as a coating agent in addition to the resin. Also, a portion of the coating resin may be impregnated into the inorganic fiber fabric.

Applications of the architectural membrane material of this embodiment include, for example, membrane ceilings, tent warehouses, and roofs of fire-resistant buildings.

Next, examples of the present invention and comparative examples are shown.

[Example 1]
The inorganic fiber fabric of Example ₁ was produced by plain weaving the warp and weft yarns made of glass fiber twisted yarns having a composition of _Al2O3 content of 25.0 mass%, _SiO2 content of 65.0 mass%, and a total content of MgO and CaO of 10.0 mass%, which were composed of 2,400 glass filaments with a diameter of 7.4 μm and had a mass of 270 g/1000 m, with the warp and weft yarns having a warp weave density of 24.6 threads/25 mm and a weft weave density of 19.7 threads/25 mm.

[Example 2]
The inorganic fiber fabric of Example ₂ was produced by plain weaving a warp and weft made of glass fiber twisted yarn having a composition of 25.0 mass% _Al2O3 , 65.0 mass% _SiO2 , and 10.0 mass% combined content of MgO and CaO, and consisting of 3,600 glass filaments with a diameter of 7.4 μm and a mass of 405 g/1000 m, with a warp weave density of 18.5 threads/25 mm and a weft weave density of 19.0 threads/25 mm.

[Example 3]
The inorganic fiber fabric of Example ₃ was produced by plain weaving a warp and weft made of glass fiber twisted yarn having a composition of 25.0 mass% _Al2O3 , 65.0 mass% _SiO2 , and 10.0 mass% combined content of MgO and CaO, and consisting of 1,800 glass filaments with a diameter of 7.4 μm and a mass of 202 g/1000 m, with a warp weave density of 24.5 threads/25 mm and a weft weave density of 21.0 threads/25 mm.

[Example 4]
The inorganic fiber fabric of Example ₄ was produced by plain weaving a warp yarn and a weft yarn using a first glass fiber twisted yarn having a composition of 25.0 mass% _Al2O3 , 65.0 mass% _SiO2 , and a total content of 10.0 mass% MgO and _CaO , which is composed of 2,400 glass filaments having a diameter of 7.4 μm and has a mass of 270 g/1000 m, and a second glass fiber twisted yarn having a composition of 14.0 mass% _Al2O3 , 54.5 mass% _SiO2 , a total content of 23.5 mass% MgO and CaO, and a total content of 8.0 mass% other components, which is composed of 1,200 glass filaments having a diameter of 7.4 μm and has a mass of 135 g/1000 m. The warp yarn and the weft yarn were plain woven with a warp weave density of 18.5 threads/25 mm and a weft weave density of 19.0 threads/25 mm.

[Comparative Example 1]
The inorganic fiber fabric of Comparative Example ₁ was produced by plain weaving alumina fiber yarns having a composition with an _Al2O3 content of 72.0 mass% and a _SiO2 content of 28.0 mass% and a mass of 100 g/1000 m as warp and weft threads, with a warp weave density of 19.8 threads/25 mm and a weft weave density of 16.8 threads/25 mm.

[Comparative Example 2]
An inorganic fiber fabric of Comparative _{Example 2} was produced by plain weaving alumina fiber yarns having a composition of 62.5 mass% _Al2O3 , 24.5 mass% _SiO2 , and 13.0 mass% total content of other components, and having a mass of 100 g/1000 m, as warp and weft yarns, with a warp weave density of 19.8 threads/25 mm and a weft weave density of 16.8 threads/25 mm.

[Comparative Example 3]
An inorganic fiber fabric of Comparative Example ₃ was produced by plain weaving a warp and weft yarns consisting of an _alumina fiber twisted _yarn having a composition with an _Al2O3 content of 72.0 mass% and a _SiO2 content of 28.0 mass% and having a mass of 300 g/1000 m, and a glass fiber twisted yarn having a glass composition with an Al2O3 content of 14.0 mass%, a _SiO2 content of 54.5 mass%, a total content of MgO and CaO of 23.5 mass%, and a total content of other components of 8.0 mass%, which is composed of 1,200 glass filaments with a diameter of 7.4 μm and has a mass of 135 g/1000 m. The warp and weft yarns had a warp weave density of 17.5 threads/25 mm and a weft weave density of 16.5 threads/25 mm.

[Comparative Example 4]
An inorganic fiber fabric of Comparative _{Example 4} was produced by plain weaving a warp and weft yarn consisting of an alumina fiber twisted yarn having a composition with _{an Al2O3} content of 62.5 mass%, a _SiO2 content of 24.5 mass%, and a total content of other components of 13.0 mass%, and having a mass of 300 g/1000 m, and a glass fiber twisted yarn having a glass composition with an _Al2O3 content of 14.0 mass%, a _SiO2 content of 54.5 mass%, a total content of MgO and CaO of 23.5 mass%, and a total content of other components of 8.0 mass%, which is composed of 1,200 glass filaments with a diameter of 7.4 μm and has a mass of 135 g/1000 m. The warp and weft yarns were plain woven with a warp weave density of 17.5 threads/25 mm and a weft weave density of 16.5 threads/25 mm.

[Comparative Example 5]
A first glass fiber twisted yarn having a composition with _{an Al2O3} content of 25.0 mass%, a _SiO2 content of 65.0 mass%, a total content of MgO and CaO of 10.0 mass%, composed of 1,200 glass filaments having a diameter of 7.4 μm and a mass of 135 g/1000 m, and a second glass fiber twisted yarn having a composition with _{an Al2O3} content of 14.0 mass%, a _SiO2 content of 54.5 mass%, a total content of MgO and CaO of 23.5 mass%, and a total content of other components of 8.0 mass%, composed of 2,400 glass filaments having a diameter of 7.4 μm and a mass of 270/1000 m were used as warp and weft yarns, and the warp weave density was 18.5 threads/25 mm and the weft weave density was 19.0 threads/25 mm, and the twisted yarn was plain woven to produce an inorganic fiber fabric of Comparative Example 5.

[Comparative Example 6]
The inorganic fiber fabric of Comparative Example ₆ was produced by plain weaving the warp and weft yarns made of glass fiber twisted yarns having a composition of _Al2O3 content of 25.0 mass%, _SiO2 content of 65.0 mass%, and a total content of MgO and CaO of 10.0 mass%, which were composed of 1,200 glass filaments with a diameter of 7.4 μm and had a mass of 135 g/1000 m, with the warp and weft yarns having a warp weave density of 19.0 threads/25 mm and a weft weave density of 18.5 threads/25 mm.

[Comparative Example 7]
The inorganic fiber fabric of Comparative Example ₇ was produced by plain weaving a warp yarn made of glass fiber twisted yarn having a composition with an _Al2O3 content of 25.0 mass%, a _SiO2 content of 65.0 mass%, and a total content of MgO and CaO of 10.0 mass%, which is made up of _{1,200 glass} filaments having a diameter of 7.4 μm and has a mass of 135 g/1000 m, and a weft yarn made of glass fiber twisted yarn having a composition with an _Al2O3 content of 25.0 mass%, a SiO2 content of 65.0 mass%, and a total content of MgO and CaO of 10.0 mass%, which is made up of 3,600 glass filaments having a diameter of 7.4 μm and has a mass of 405 g/1000 m.

[Comparative Example 8]
The inorganic fiber fabric of Comparative _{Example 8} was produced by plain weaving a warp and weft made of glass fiber twisted yarn having a composition of 14.0 mass% _Al2O3 , 54.5 mass% _SiO2 , 23.5 mass% combined content of MgO and CaO, and 8.0 mass% combined content of other components, and consisting of 1,780 glass filaments with a diameter of 7.4 μm and a mass of 200 g/1000 m, with a warp weave density of 19.8 threads/25 mm and a weft weave density of 19.7 threads/25 mm.

The mass per unit area of the inorganic fiber fabric for each example and comparative example, the value of Wt1 ^/3 ×Tt1 ^/2 /(At/100) + Wy1 ^/3 ×Ty1 ^/2 /(Ay/100), and the value of (Tt/Ty) {Wt1 ^/3 ×Tt1 ^/2 /(At/100) + Wy1 ^/3 ×Ty1 ^/2 /(Ay/100)} are shown in Table 1.

The inorganic fiber fabrics of each Example and Comparative Example were evaluated for heat damage resistance, suitability as a building membrane material, and weaving ability as follows. The results are shown in Table 1.

[Heat resistance]
A sample with a 10 kg weight and a diameter of 100 mm is placed in a muffle furnace, and the temperature in the furnace is raised to 800°C so that the temperature is in accordance with the standard heating temperature curve of ISO834. After the temperature is lowered for three times the time required for the temperature rise, the sample is removed and checked for damage. Next, a test piece is cut into a width of 25 mm and a length of 150 mm in both the vertical and horizontal directions, and evaluated by a tensile test in accordance with JIS L 1096:2010. If there is no damage and the tensile strength is 450 N/25 mm or more, it is evaluated as "A", if there is no damage and the tensile strength is less than 450 N/25 mm, it is evaluated as "B", and if there is damage, it is evaluated as "C".

[Suitability for architectural membrane materials]
Test pieces were cut to a width of 25 mm and a length of 150 mm in both the vertical and horizontal directions and evaluated by a tensile test in accordance with JIS L 1096: 2010. A tensile strength of 3000 N/25 mm or more was evaluated as "A", a tensile strength of 2000 N/25 mm or more but less than 3000 N/25 mm was evaluated as "B", and a tensile strength of less than 2000 N/25 mm was evaluated as "C".

[Weaving ability]
When warping and weft weaving are performed, if no slack, fluff or breakage of the yarn occurs, it is evaluated as "OK", and if slack, fluff or breakage of the yarn occurs, it is evaluated as "NG".

From Table 1, it is clear that the inorganic fiber fabrics of Examples 1 to 4 have excellent heat breakage resistance, excellent weaving properties, and high suitability as architectural membrane materials.

On the other hand, the inorganic fiber fabrics of Comparative Examples 1 and 2, in which the average Al ₂ O ₃ content At of the warp yarns constituting the inorganic fiber fabric and the average Al ₂ O ₃ content Ay of the weft yarns constituting the inorganic fiber fabric are higher than those of Examples 1 to 4 and the value of Wt ^1/3 × Tt ^1/2 / (At/100) + Wy ^1/3 × Ty ^1/2 / (Ay/100) is less than 316.5, clearly have low suitability as architectural membrane materials and poor weaving properties.

Furthermore, although the average _Al2O3 content At of the warp _yarns constituting the inorganic fiber fabric and the average _Al2O3 content Ay of the weft yarns constituting the inorganic fiber fabric are lower than those of Comparative Examples 1 and 2, the inorganic fiber fabrics of Comparative Examples 3 and ₄ , in which the value of Wt1/ ³ × Tt1/ ² / (At/100) + Wy1 ^/3 × Ty1 ^/2 / (Ay/100) is less than 316.5, clearly have poor weaving properties.

Furthermore, the inorganic fiber fabric of Comparative Example 5, in which the value of Wt1 ^/3 ×Tt1/ ² /(At/100) + Wy1/ ³ ×Ty1 ^/2 /(Ay/100) is greater than 550.0, clearly has low heat breakage resistance, and the inorganic fiber fabric of Comparative Example 6, in which the value of Wt1 ^/3 ×Tt1/ ² /(At/100) + Wy1 ^/3 ×Ty1 ^/2 /(Ay/100) is less than 316.5 and lower than the inorganic fiber fabrics of Comparative Examples 3 and 4, clearly has low heat breakage resistance and suitability as an architectural membrane material.

Furthermore, the inorganic fiber fabric of Comparative Example 7, in which the ratio of Tt to Ty (Tt/Ty) is less than 0.66, clearly has poor weaving properties, and the inorganic fiber fabric of Comparative Example 8, in which the average _Al2O3 content _At of the warp yarns constituting the inorganic fiber fabric and the average _Al2O3 content _Ay of the weft yarns constituting the inorganic fiber fabric are less than 17.0 mass%, clearly has low heat breakage resistance.

Claims (5)

An inorganic fiber fabric for architectural membrane materials, comprising:
the average _Al2O3 content At of the warp _yarns constituting the inorganic fiber _woven fabric and the average _Al2O3 content Ay of the weft yarns constituting the inorganic fiber woven fabric are each in the range of 17.5 mass% or more;
a mass (Tt) per unit length of a warp yarn constituting the inorganic fiber woven fabric and a mass (Ty) per unit length of a weft yarn constituting the inorganic fiber woven fabric are each in the range of 100 to 600 g/1000 m;
a weave density Wt of a warp yarn constituting the inorganic fiber woven fabric and a weave density Wy of a weft yarn constituting the inorganic fiber woven fabric are each in the range of 10.0 to 55.0 yarns/25 mm;
a ratio of the Tt to the Ty (Tt/Ty) is in the range of 0.66 to 1.50;
The inorganic fiber fabric for architectural membrane materials, wherein At, Ay, Tt, Ty, Wt and Wy satisfy the following formula (1).
316.5≦Wt ^1/3 ×Tt ^1/2 / (At/100) + Wy ^1/3 ×Ty ^1/2 / (Ay/100)≦550.0 ... (1) 2. The inorganic fiber woven fabric for architectural membrane materials according to claim 1, wherein At, Ay, Tt, Ty, Wt and Wy satisfy the following formula (2).
346.0≦Wt ^1/3 ×Tt ^1/2 / (At/100) + Wy ^1/3 ×Ty ^1/2 / (Ay/100)≦464.0 ... (2) 3. The inorganic fiber woven fabric for architectural membrane materials according to claim 1 or 2, wherein At, Ay, Tt, Ty, Wt and Wy satisfy the following formula (3).
316.5≦(Tt/Ty) {Wt ^1/3 ×Tt ^1/2 /(At/100)+Wy ^1/3 ×Ty ^1/2 /(Ay/100)}≦550.0...(3) The inorganic fiber fabric for architectural membrane materials according to any one of claims 1 to 3, characterized in that At, Ay, Tt, Ty, Wt and Wy satisfy the following formula (4).
346.0≦(Tt/Ty) {Wt ^1/3 ×Tt ^1/2 / (At/100) + Wy ^1/3 ×Ty ^1/2 / (Ay/100)}≦464.0 ... (4) An architectural membrane material comprising the inorganic fiber fabric for architectural membrane materials according to any one of claims 1 to 4 and a coating resin that coats both the front and back sides of the inorganic fiber fabric for architectural membrane materials.