JP6583912B2 - Sound absorbing film material - Google Patents

Description

  The present invention is an indoor stadium, gymnasium, indoor pool, event hall, public hall, ceremonial hall, station building, airport, shopping mall, etc. The present invention relates to a nonflammable film material as a ceiling accessory (aerial film).

  Patent Document 1 discloses an open knitted fiber twist formed by weaving a coated yarn as a fiber twist capable of absorbing sound waves and having an opening capable of capturing sound waves, and a “parallel” opening as an opening. By providing two types of openings with different shapes and angular directions, the incident direction and angle are effective in absorbing various sound waves. However, Patent Document 1 does not describe the specific shape, size, depth, distribution density, angle, and the like of the “parallel” opening and the “intersection” opening, and the known 2/2 diagonal weave is an example. It has only been done. In addition, Patent Document 1 does not disclose the use or usage of the fiber twist, but the building materials used in Japan are flameproof as stipulated in the Fire Service Act or non-combustible according to the Building Standards Act (ASTM-E1354: corn). Many require a calorimeter burning test method). However, since the fiber twisted article of Patent Document 1 has a large number of openings, there is a problem that flames and smoke are likely to leak during a fire, and safety of evacuation guidance cannot be ensured. Currently, there is a demand for a membrane material for ceiling materials having light weight and flexibility, which has a sound absorbing effect and is particularly nonflammable.

Special table 2014-518338 gazette

  Although the present invention has a void portion related to air permeability and sound absorption as a ceiling area constituting membrane material (membrane ceiling) and a sound absorbing membrane material installed on a ceiling of a building or a ceiling accessory (aerial membrane) It is an object of the present invention to provide a sound-absorbing film material that is excellent in the effect of blocking the leakage of flammable gas and toxic gas, and that ensures the safety of evacuation because the voids of the fabric are almost closed during a fire.

  In order to solve the above problems, in a woven fabric having a porosity of 1 to 5% including a thermally expandable core-sheath yarn in a woven or knitted element, the core portion of the thermally expandable core-sheath yarn is a multifilament yarn and the sheath portion is layered As the thermoplastic resin composition layer containing an inorganic compound, the porosity of the woven fabric is closed to less than 1% by thermal expansion of the thermally expandable core-sheath yarn, the woven fabric is a single-layered fabric, or a double-woven fabric, or By making the aspect of the triple woven fabric, and further by flattening the cross section of the thermally expandable core-sheath yarn, the resulting ceiling area constituting membrane material (membrane ceiling) or the fabric membrane material as an accessory to the ceiling area constituting member is obtained. It has sufficient strength as a membrane ceiling, has lightness and flexibility that is unlikely to cause serious human damage even if the ceiling collapses, and has anti-reflection and sound absorption effects That non-combustible film materials with excellent resistance can be obtained This has led to the completion of the present invention.

That is, the sound-absorbing membrane material of the present invention is a woven fabric having a porosity of 1 to 5% including a heat-expandable core-sheath yarn in a woven or knitted element, and the core portion of the heat-expandable core-sheath yarn is a multifilament yarn. It is preferable that the sheath part is a thermoplastic resin composition layer containing a layered inorganic compound, and the porosity of the woven fabric is closed to less than 1% by thermal expansion of the sheath part of the thermally expandable core-sheath yarn. The sound absorption effect is exhibited by the total pores with a porosity of 1 to 5%, and at the same time, the heat absorption film material is irradiated with radiant heat of 50 kW / m ² by a flame heat (simulated by a cone calorimeter test (ASTM-E1354)). The heat-expandable core-sheath yarn expands in volume, and the effect causes the sound-absorbing membrane material with a porosity of 1 to 5% to be clogged, closing the porosity to less than 1% (including 0%). By blocking the penetration of flame and leakage of toxic gas by the action, nonflammability according to the Building Standard Law can be provided.

In the sound-absorbing film material of the present invention, the layered inorganic compound is preferably at least one selected from smectite clay minerals, synthetic smectites, sericite, fluorine mica, and expanded graphite. By containing these layered inorganic compounds in the sheath part, the heat-expandable core sheath with flame heat due to fire (simulated when radiant heat of 50 kW / m ² is applied by cone calorimeter test (ASTM-E1354)) The sheath of the yarn expands in volume, and the effect causes clogging of the woven fabric having a porosity of 1 to 5%, and the effect of blocking the porosity of the sound absorbing film material to less than 1% (including 0%) It can be provided with non-flammability according to the Building Standards Law by blocking the penetration of gas and leakage of toxic gas.

  In the sound-absorbing film material of the present invention, it is preferable that the thermoplastic resin composition layer contains a soft vinyl chloride resin and molybdenum compound particles. Residue layer (chlorine-molybdenum composite oxide) that strengthens the combustion carbide of these chlorine-containing resins by using chlorine compound resins such as vinyl chloride resin, soft vinyl chloride resin, vinylidene chloride resin, chlorinated polyethylene and molybdenum compound particles together ) To keep the interruption of flame penetration and toxic gas leakage for a long time, so that the sound-absorbing film material has nonflammability according to the Building Standards Act.

  In the sound-absorbing membrane material of the present invention, the woven or knitted element is 1) a warp group and a weft group, or 2) a warp group and a left-upper / right-upward bias yarn group, and the woven fabric is a single layer. Any one selected from a woven fabric, a double woven fabric, and a triple woven fabric is preferable. As a result, a sound absorption effect is manifested by complex interspersed texture units (random arrangement or regular arrangement) having different sound absorption properties over the entire sound-absorbing film material of the present invention, and at the same time sufficient strength as a membrane ceiling, It shall have both light weight and flexibility.

  In the sound-absorbing film material of the present invention, it is preferable that the thermally expandable core-sheath yarn has a flat elliptical cross section, and the ratio of height: width in the flat elliptical cross section is from 3: 4 to 1: 4. This can effectively block the porosity of the fabric during thermal expansion.

  According to the present invention, a ceiling area constituting membrane material (membrane ceiling) and a sound-absorbing membrane material installed on the ceiling of a building, or a ceiling accessory (aerial membrane) having a void portion related to air permeability and sound absorption Regardless, in the event of a fire, the fabric voids are almost blocked, and a sound-absorbing film material that has an excellent shielding effect against flames and toxic gas leaks and ensures safety for evacuation can be obtained. As well as indoor ceiling stadiums, gymnasiums, indoor pools, event halls, public halls, ceremonial occasions, station buildings, airports, shopping malls and other membrane ceiling constructions, optical ceiling membrane constructions, as well as partitions, blinds, awnings It can also be applied to tents.

The figure which shows typically an example of the woven / knitting element of the sound-absorbing film material of this invention The figure which shows typically an example of the cross section of the sound-absorbing film material of this invention

  The sound-absorbing membrane material of the present invention is a woven fabric having a porosity of 1 to 5% including a heat-expandable core-sheath yarn in a woven or knitted element, wherein the core portion of the heat-expandable core-sheath yarn is a multifilament yarn, Single layer fabric, or double layer, wherein the portion is a thermoplastic resin composition layer containing a layered inorganic compound, and the porosity of the fabric can be closed to less than 1% by thermal expansion of the thermally expandable core-sheath yarn Woven or triple woven. A heat-expandable core-sheath yarn has a multifilament yarn as a core material and is provided with a thermoplastic resin composition layer on the entire surface thereof. The multifilament yarn is impregnated with a resin, or one of the multifilament yarns. This includes embodiments in which the part is impregnated with resin. In order to make the sound-expandable core-sheath yarn sufficiently incombustible of the sound-absorbing membrane material of the present invention, inorganic fibers such as glass fiber, silica fiber, alumina fiber, silica-alumina fiber, basalt fiber, carbon fiber, And non-flammable fibers such as metal fibers such as stainless steel fibers, etc., but part of the yarn is poly pphenylene terephthalamide fiber, poly p benzamide fiber, p phenylene 3,4 oxydiphenylene terephthalamide copolymer fiber You may select and use from heat resistant fibers, such as an aramid fiber, poly p phenylene benzimidazole fiber, poly p phenylene benzoxazole fiber, poly p phenylene benzthiazole fiber, polyether ether ketone fiber, polysulfone fiber. Similarly, the above-mentioned noncombustible fiber or heat-resistant fiber may be used in combination with a synthetic fiber such as polypropylene fiber, polyethylene fiber, polyester fiber, nylon fiber, or vinylon fiber. In addition, a short fiber spun yarn such as non-combustible cotton or non-combustible kenaf obtained by boric acid esterification, phosphoric acid esterification, or silicic acid esterification of the hydroxyl group of cellulose, or the above-mentioned noncombustible fiber or heat resistant fiber It is also effective to use a part of a yarn blended with a short fiber spun yarn made of synthetic fiber or the like.

  The multifilament yarn used as the core is a yarn having a filament diameter of 3 to 10 μm and a fineness of 69 to 2223 dtex, particularly 138 to 1112 dtex, and a number of filaments of 50 to 500, particularly 100 to 300, are bundled to be untwisted or twisted. In the sound absorbing film material of the present invention, a multifilament yarn having a flat elliptical cross section is particularly preferable in which the cross-sectional shape thereof is circular, elliptical, and flat (ellipse crushed horizontally). Similarly, a thermally expandable core-sheath yarn using a multifilament yarn having a flat elliptical cross section as a core yarn has a flat elliptical cross section, and the ratio of the height: width in the flat elliptical cross section of the thermally expandable core-sheath yarn is 3 : 4 to 1: 4, especially 2: 3 to 2: 5, a flat ellipse is superior in sound absorption by JIS A1405 (vertical incidence method), and is excellent in the efficiency of closing the voids of the fabric due to thermal expansion. The safety measures at the time of evacuation can be secured by easily blocking the penetration of the flame and leakage of toxic gas. Further, the core yarn multifilament yarn may include a gap that converges 50 to 500 filaments, such as a taslan yarn, an interlace yarn, a wooly yarn, etc. in which the filaments are intertwined with a gap. Specifically, when producing multifilament yarns, filament opening (defibration) is performed by air jet entanglement with a Taslan nozzle, and entrainment and entanglement are forced in a turbulent vortex to make it random and loose It is a bulky yarn that is bulky by forming a large number of entanglements, loops, spiral coils, and knots. Alternatively, it may be a crimped (core-sheath) filament, or a (core-sheath) bulky yarn obtained by entanglement between crimped (core-sheath) filaments. Like these bulky yarns, when sound is incident on a fibrous material with a continuous space (material with a large surface area), the sound diffuses in the small space, causing friction and resistance with the filament, and vibration of the filament. For example, part of sound energy is consumed as heat energy.

  When the core portion of the thermally expandable core-sheath yarn is a multifilament yarn made of glass fiber in particular, the glass fiber is E (non-alkali) glass, C (containing alkali) glass, G glass, A glass, S glass, D glass. Any glass composition such as DE glass may be used, and the glass fiber is subjected to a surface modification treatment with a silane coupling agent. The adhesion with the resin coating layer constituting the thermally expandable core-sheath yarn It is preferable in terms of improvement. Specific examples of the silane coupling agent include vinyltrimethoxysilane, vinyltriethoxysilane, 3-methacryloxypropyltrimethoxysilane, 3-methacryloxypropylmethyldiethoxysilane, 3-acryloxypropyltrimethoxysilane, and 3-amino. One or more selected from propyltrimethoxysilane, 3-triethoxysilyl-N- (1,3-dimethyl-butylidene) propylamine, 3-glycidoxypropyltrimethoxysilane, 3-mercaptopropylmethyldimethoxysilane and the like In addition, organic titanate compounds may be used.

The sheath part of the heat-expandable core-sheath yarn (thermoplastic resin composition layer containing a layered inorganic compound) has thermal expansibility, and flame heat due to fire (simulated corn calorimeter test (ASTM-E1354)) The volume of the sound-absorbing film material is expanded by a radiant heat of 50 kW / m ² ), and the effect causes clogging of the woven fabric having a porosity of 1 to 5%, and the porosity of the sound-absorbing film material is less than 1% ( It is possible to have nonflammability according to the Building Standards Act by blocking the penetration of the flame and the leakage of toxic gas by the action of blocking (including 0%). In order to make the sheath portion of the thermally expandable core-sheath yarn thermally expandable,
One or more layered inorganic compounds selected from smectite clay mineral, synthetic smectite, sericite, fluorine mica, and expanded graphite are contained in the thermoplastic resin composition layer as a sheath part in an amount of 1.5 to 10% by mass. To. The thermoplastic resin component constituting the thermoplastic resin composition layer is a vinyl chloride resin (a soft composition containing a plasticizer in an amount of 30 to 100 parts by mass with respect to 100 parts by mass of the vinyl chloride resin), vinyl chloride copolymer Polymer resin, olefin resin, olefin copolymer resin, urethane resin, urethane copolymer resin, acrylic resin, acrylic copolymer resin, vinyl acetate resin, vinyl acetate copolymer resin, styrene resin, styrene resin A copolymer resin, a polyester resin, a polyester copolymer resin, a fluororesin (polytetrafluoroethylene), a fluorocopolymer resin, and the like can be used.

  Among the layered inorganic compounds, the smectite clay mineral is 2: 1 type smectite, and a layer composed of silicon and oxygen (silica tetrahedral layer) sandwiches a layer composed of aluminum and oxygen (aluminum octahedral layer). The “silica tetrahedral layer / aluminum octahedral layer / silica tetrahedral layer” structural layer is a unit, and the structural layers are stacked. Specific examples of dioctahedral smectite include montmorillonite, beidellite, nontronite, and specific examples of trioctahedral smectite include saponite, hectorite, soconite, and stevensite. The synthetic smectite has a structure in which a silica tetrahedral (tetracoordinate) layer and an aluminum octahedral (hexacoordinate) layer are alternately stacked, and a mass ratio of silica / aluminum is preferably 2: 1. Sericite (sericite) is fine muscovite and has an average particle diameter of 1 to 20 μm. As the fluorine mica, fluorine tetrasilicon mica having an average particle diameter of 1 to 20 μm obtained by organic exchange treatment of Na tetrasilicon mica can be used. Further, an intercalation type layered compound in which a quaternary ammonium compound is substituted and modified between layers of a smectite clay mineral (such as montmorillonite) can also be used. For expanded graphite, natural graphite can be treated with concentrated sulfuric acid, nitric acid, selenic acid, etc. and concentrated nitric acid, perchlorate, permanganate, dichromate, etc., and these have a graphite-like layer structure. Since it is a crystalline compound, it expands with a gas generated by heat to form a nonflammable carbonized layer.

  The sheath portion of the thermally expandable core-sheath yarn (the thermoplastic resin composition layer containing a layered inorganic compound) preferably includes a soft vinyl chloride resin and molybdenum compound particles. Specifically, a vinyl chloride resin is used. (Soft composition containing 30 to 100 parts by mass of plasticizer with respect to 100 parts by mass of vinyl chloride resin) 1.5 to 10 parts by mass of layered inorganic compound and 1.5 to 1.5 parts of molybdenum compound particles with respect to 100 parts by mass A composition containing 10 parts by mass is preferred. As molybdenum compound particles, molybdenum trioxide, molybdic acid, phosphomolybdic acid, molybdenum disulfide, sodium molybdate, hexaammonium molybdate, diammonium molybdate, calcium molybdate, zinc zinc molybdate, potassium molybdate, molybdic acid Residue layer (chlorine) that strengthens the combustion carbide of these chlorine-containing resins, especially when used in combination with chlorine-containing resins (vinyl chloride resin, soft vinyl chloride resin, vinylidene chloride resin, chlorinated polyethylene), etc. -Molybdenum composite oxide) can be provided with nonflammability according to the Building Standards Act by maintaining a blocking effect such as penetration of flame and leakage of toxic gas for a long time.

  In addition, flame retardant particles can be used in combination with the sheath portion of the thermally expandable core-sheath yarn (the thermoplastic resin composition layer containing a layered inorganic compound), and the flame retardant particles are a). Phosphorus atom-containing compounds such as metal phosphates, metal organic phosphates, phosphoric acid derivatives, ammonium polyphosphates, and ammonium polyphosphate derivatives (such as melamine-modified products), b). Nitrogen-containing compounds such as (iso) cyanurate compounds, (iso) cyanuric acid compounds, guanidine compounds (such as dicyandiamide), urea compounds (such as dimethylolurea), and derivative compounds thereof (eg, melamine cyanurate) C). Metal hydroxide (such as aluminum hydroxide), metal oxide (such as antimony oxide), metal carbonate compound (such as basic magnesium carbonate), metal sulfate compound (such as barium sulfate), boric acid compound (such as zinc borate) ), And inorganic compounds such as inorganic compound composites (hydrotalcite, etc.), d). One or more selected from a bromine-substituted organic compound and a chlorine-substituted organic compound.

  In the heat-expandable core-sheath yarn, the thickness of the sheath portion (thermoplastic resin composition layer containing a layered inorganic compound) is preferably 0.03 mm to 0.5 mm, particularly preferably 0.05 mm to 0.3 mm. On the other hand, the heat-expandable core-sheath yarn is provided with a thermoplastic resin composition layer (sheath portion) on the entire circumference of the multifilament yarn core material, and the entire multifilament yarn core material is impregnated with resin, or the multifilament yarn. It includes an embodiment in which a part of the core yarn is impregnated with resin. In this embodiment, the mass ratio of the multifilament yarn core material to the thermoplastic resin composition layer (sheath portion) is 3: 1 to 1: 2, preferably 3: 2 to 2: 3. Particularly preferred thermoplastic resin composition layer (sheath portion) in the present invention is a vinyl chloride resin (including soft to semi-rigid vinyl chloride resin containing a plasticizer, a stabilizer, a flame retardant, etc.), a styrene copolymer. It is a thermoplastic resin such as a resin (containing a flame retardant), a urethane copolymer resin (containing a flame retardant, etc.), and a fluorine copolymer resin. These thermoplastic resins are used in an extrusion molding machine in which a multifilament yarn is cored through a coating die die. By extruding the thermoplastic resin in a hot melt state from the nozzle nozzle hole of a coating die, A thermally expandable core-sheath yarn is obtained by continuously coating the surface of the multifilament yarn core material with a thermoplastic resin composition layer (sheath portion). In addition, a multifilament yarn core material is dipped in a viscous liquid such as a vinyl chloride resin paste sol, a flame retardant resin solution solubilized in an organic solvent, an aqueous resin-based flame retardant composition such as an emulsion or latex, You may obtain a thermally expansible core-sheath thread by heat-drying this. In these thermoplastic resin composition layers (sheath portions), organic pigments, inorganic pigments, pearl powder pigments, aluminum powder pigments, bright pigments, phosphorescent pigments, fillers, ultraviolet absorbers, deterioration inhibitors, as necessary Known additives such as adhesives, fungicides, antibacterial agents, insect repellents, antistatic agents, and perfumes can be included.

Examples of the woven and knitted elements of the sound-absorbing membrane material of the present invention are 1) warp yarn group and weft yarn group, or 2) warp yarn group and left oblique upper and right oblique upper bias yarn group, and the woven fabric is a single layer. It is one embodiment selected from a woven fabric, a double woven fabric, and a triple woven fabric. In the case where the knitting element is 1) a warp yarn group and a weft yarn group, either of the groups includes a thermally expandable core-sheath yarn in a regular alternating arrangement or a random arrangement, or a warp yarn group or a weft yarn group. Examples of the proper use can be given as examples, each of which is a single-layer woven fabric, a double woven fabric, or a triple woven fabric. Similarly, in the case of a triaxial woven element with 2) warp yarn group and left diagonally upper / right diagonally biased yarn group, thermally expandable core-sheath yarns are regularly arranged alternately or randomly in both groups. Examples of the mode included in the arrangement, or the mode used properly for either the warp yarn group or the bias yarn group can be exemplified, and each of these is a single layer woven fabric, a double woven fabric, or a triple woven fabric. The value when the sum of the pore-shaped gaps at the woven / knitting intersections of elements 1) and 2) is defined as the porosity is preferably 5% or less, particularly preferably 2.5% or less. When sound enters the hole gap, resonance vibration occurs at a specific frequency, air vibrates in the hole gap, and sound energy is attenuated. Therefore, the hole diameter of the hole gap is in the range of 0.05 to 1.0 mm. Preferably, the number of hole gaps is in the range of (vertical 8 × horizontal 8) to (vertical 60 × horizontal 60) /25.4 mm ² , especially ( vertical 12 × horizontal 12) and - (33 × width 33 length) of 25.4 mm ² peak higher the sound absorbing effect.

Single-layer fabrics are plain fabrics, 2/2 Nanako (basket) fabrics, 2/2 cocoon fabrics, twill fabrics: 2/1 twill fabrics, 2/2 twill fabrics, 3/1 obliques (four sheets twill), 3 / 1 Torn text (4 sheets Aya), 3/2 Text (5 sheets Aya), 4/1 Text (5 sheets Aya), 5/1 Text (6 sheets Aya), 4/2 Text ( 6 sheets Aya), 1/3/1, 1 Oblique (6 sheets Aya), etc. Ako fabric: 2 jump 4/1 Auko (5 sheets Ako), 3 jump 4/1 Auko (5 sheets Auko), 2 jumps 3/2 Auko (5 sheets Auko), 3 Jump 3/2 Auko (5 sheets Auko), etc., and these changed plain fabrics, changed twill fabrics, changed satin fabrics, honeycomb fabric, pear fabrics, tearing obliques textile, day and night satin product, twisting the fabric (gauze fabric, Roori thereof), Nuito fabrics, such as Russell knitting can be used, they are mass 0.2~1.2kg / ^{m 2,} void ratio of 5% or less (textile intersection Of hole-like gaps Occupancy of the sum), preferably 2.5% or less, and an air permeability (JIS L1096: the Frazier method) 3~50cc / cm ² / sec, preferably exemplified those satisfying 10~25cc / cm ² / sec .

The double woven fabric is a woven fabric that overlaps the upper and lower two sheets using the front and back warp yarns and the front and back weft yarns, and the upper fabric has a porosity of 10 between the front warp yarn and the front weft yarn. % Or less (occupation ratio of the total pore clearance generated at the weaving and knitting intersection), and the lower woven fabric has a porosity of 10% or less between the back warp and the back weft (total of the pore clearance generated at the weaving and knitting intersection) ² ), a mass of 0.4 to 2.4 kg / m ² , a common void ratio of 5% or less (occupation ratio of the sum of overlapping portions of pore-shaped gaps generated in the stacked fabrics), preferably 2. Examples are those satisfying 5% or less and air permeability (JIS L1096: Fragil method) of 3 to 50 cc / cm ² / sec, preferably 10 to 25 cc / cm ² / sec. Similarly, the upper and lower fabrics are overlapped using upper / lower warp and front / back warp bias yarns, and the upper fabric has a porosity of 10% between the front warp and the front warp yarn. The following is made up (occupation ratio of the sum of the hole gaps generated at the weaving and knitting intersections), and the lower fabric has a void ratio of 10% or less between the back warp and the back diagonal threads (the sum of the hole gaps occurring at the weaving and knitting intersections) ² ), a mass of 0.4 to 2.4 kg / m ² , a common void ratio of 5% or less (occupation ratio of the sum of overlapping portions of pore-shaped gaps generated in the stacked fabrics), preferably 2. Examples are those satisfying 5% or less and air permeability (JIS L1096: Fragil method) of 3 to 50 cc / cm ² / sec, preferably 10 to 25 cc / cm ² / sec. When the air permeability is less than 3 cc / cm ² / second, the echo suppression effect may be deteriorated, and when it exceeds 50 cc / cm ² / second, the sound absorption effect may be deteriorated. The common void ratio is that the sound-absorbing membrane material is placed horizontally, and when this is observed from the vertical direction, the void portion of the upper fabric and the void portion of the lower fabric overlap each other and pass through the two fabrics. Is the occupancy rate per unit area. In other words, the upper woven yarn is arranged to overlap the lower woven fabric gap, or the lower woven yarn is arranged to overlap the upper woven void, and the shared porosity becomes a small value, Apparently 0 depending on the degree of overlap. A warp double woven fabric is composed of a set of weft and warp warps and warp warps, and an extra warp thread is woven on the back of a single woven fabric. 2: 1, 3: 1, etc. A weft double woven fabric consists of a set of warps and wefts with a weft and back weaving and a single weaving with another weft, and the arrangement of wefts and wefts is 1: 1, 2: 1, 3: 1 and so on. The background double woven fabric is obtained by weaving two woven fabrics with the same loom, and connecting the upper and lower two woven fabrics (with a mass of 0.4 to 1.2 kg / m ² ) with the yarns.

Similarly, a triple woven fabric is a woven fabric in which three upper, middle, and lower fabrics are stacked using front, middle, and back warp yarns and front, middle, and back weft yarns. Each of the woven fabric and the lower woven fabric is composed of a void of 10% or less (occupation ratio of the total pore-shaped gap generated at the knitting intersection), and a mass of 0.2 to 1.0 kg / m ² , and a mass of 0.6 to 3. 0 kg / m ² shared porosity 5% or less (occupation ratio of the sum of overlapping portions of the pore-shaped gaps generated in the stacked fabric), preferably 2.5% or less, and air permeability (JIS L1096: Frazier method) 3 50 cc / cm ² / sec, preferably those satisfying 10~25cc / cm ² / sec, likewise through triple fabric (a set of tissue Omotekei, medium through-Urakei weft strip), weft triple fabric ( A set of warps, wefts, middle wefts, and back weaves)), weft triple woven fabrics: a) Weaving three woven fabrics with the same loom, and lower weaving with the woven yarns From the middle fabric to the upper fabric, b) from the upper fabric to the middle fabric, from the middle fabric to the lower fabric, c) from the upper fabric to the middle fabric Examples are those that are connected and connected from the lower fabric to the middle fabric, and d) only the ears of the upper, middle, and lower three fabrics are connected. When the air permeability is less than 3 cc / cm ² / second, the echo suppression effect may be deteriorated, and when it exceeds 50 cc / cm ² / second, the sound absorption effect may be deteriorated.

Specifically, double woven fabrics use fly shuttle looms, air jet looms, slewer looms, rapier looms, water jet looms, etc. 2/1 obliquely weaved (twill) weave structure consisting of an upper woven fabric having a 2/1 oblique (weave) weave structure, a heat-expandable core-sheath yarn and a weft-heat-expandable core-sheath yarn The lower woven fabric having the heat-expandable core-sheath yarns of the lower fabric are joined to the weft-heat-expandable core-sheath yarns of the upper fabric every predetermined number at the connection point, and at the same time, A double woven fabric in which weft-heat-expandable core-sheath yarns are floated on the heat-expandable core-sheath yarns of the upper fabric every predetermined number and joined at the connection point. It is preferable to provide 8 to 50 points per square inch area. In the sound-absorbing membrane material using such a double woven fabric, the woven fabric has an upper fabric having a 2/1 oblique (twill) weave structure and a 2/1 oblique (weave) weave fabric. By forming a double woven fabric composed of a lower woven fabric having the structure of the upper fabric and the lower woven fabric, it is possible that the texture of the upper woven fabric and the lower woven fabric intersect and the voids of the respective woven fabrics do not completely overlap each other. Satisfying a shared porosity of 5% or less. This double woven fabric has a common porosity of 5% or less, and can satisfy an air permeability (JIS L1096: Frazier method) of 3 to 50 cc / cm ² / sec even when the apparent porosity is 0%. This is because the gap at the interface between the upper fabric and the lower fabric functions as a ventilation portion, and the space between the upper fabric and the lower fabric is three-dimensionally connected. Such a three-dimensional continuous ventilation portion effectively contributes to acoustic diffusion absorption. In addition, the woven intersection of the heat-expandable core-sheath yarn and the weft-heat-expandable core-sheath yarn fixed to each other by thermal adhesion is excellent in the form stability of the sound-absorbing membrane material, and is particularly heat-melt-fixed at the woven intersection If it is not done at all or heat adhesion is slight, the sound-absorbing membrane material is made flexible. The fixing of the woven intersections by thermal adhesion may extend over the entire double woven fabric, or may be performed at equal intervals vertically or horizontally or at random partial woven intersections.

Similarly, in the triple woven fabric, each fabric's oblique line intersects with the adjacent fabric's oblique line because each fabric's oblique line intersects with the adjacent fabric's oblique line. Since they do not completely overlap each other, the shared porosity is 5% or less. Such a triple woven fabric has a common porosity of 5% or less, and can satisfy an air permeability (JIS L1096: Frazier method) of 3 to 50 cc / cm ² / sec even when the apparent porosity is 0%. This is because the gap between the interface between the upper fabric and the middle fabric, and the interface between the middle fabric and the lower fabric functions as a ventilation part, and three-dimensionally connects the voids of the upper fabric, the middle fabric, and the lower fabric. By action. Such a three-dimensional continuous ventilation portion effectively contributes to acoustic diffusion absorption. In addition, the double woven fabric and the triple woven fabric structure are an upper woven fabric having an M / N oblique (twill) weave structure and a lower woven fabric having an M / N oblique (twill) weave structure. A double woven fabric (M = 2 to 5, an integer of N = 1) or (M = 1, an integer of N to 2 to 5), and an M / N oblique (twill) weave structure A triple woven fabric (M = 2 to 5 integers, N = 1) or (M = 1,) consisting of an upper woven fabric and a lower woven fabric, and a middle woven fabric having an M / N oblique (twill) weave structure N is an integer of 2 to 5. Similarly, even if the sound-absorbing film material of the present invention is a quadruple woven fabric or a five-fold woven fabric, a corresponding sound absorbing effect is obtained.

Similarly, in the case of layered woven fabrics of plain fabric, imitation weave, five-sheet satin weave (2 jump 4/1 Auko, 3 jump 4/1 Auko, 2 jump 3/2 Auko, 3 jump 3/2 Auko) A fabric in which the tissue misalignment of the upper / lower or upper / middle / lower) is shifted by one complete structure vertically and horizontally so that the texture misalignment of the weaving structure does not overlap the same part. And Since the gap is shifted from the front, the common porosity is 5% or less, but even if the apparent porosity is 0%, the air permeability (JIS L1096: Frazier method) can be 3 to 50 cc / cm ² / sec. This is because the gap between one or two interfaces of the fabrics (upper / lower, or upper / middle / lower) functions as a ventilation portion and connects the voids of each fabric in a three-dimensional manner. Such a three-dimensional continuous ventilation portion effectively contributes to acoustic diffusion absorption. Further, it is a triaxial woven fabric in which two or three woven fabrics using warp yarns and bias yarns on the left oblique upper and right oblique upper portions are overlapped, each having a void ratio of 10% or less and a mass of 0.8 to 3.0 kg / m ² , shared porosity 5% or less (preferably 2.5% or less), and air permeability (JIS L1096: Frazier method) 3 to 50 cc / cm ² / sec, preferably 10 to 25 cc / cm ² 2 or 3 fabrics using warp yarns, weft yarns, and upper left and upper right bias yarns, such as triaxial flat fabrics satisfying / sec, triaxial basket fabrics or triaxial mimetic fabrics A four-ply woven fabric that overlaps and has a porosity of 10% or less for each portion of fabric, a mass of 0.8 to 3.0 kg / m ² , a shared porosity of 5% or less (preferably 2.5% or less), and ventilation Degree (JIS L1096: Frazier method) 3-50 cc / cm ² / sec, preferably It may be a four-axis flat woven fabric satisfying 10 to 25 cc / cm ² / sec, a four-axis basket woven fabric, a four-axis mimic woven fabric, or the like. In the above-mentioned woven fabric, the woven intersections of the thermally expandable core-sheath yarns fixed to each other by thermal adhesion are excellent in the form stability of the sound-absorbing membrane material, and those that are not thermally fused and fixed at the woven intersections or have thermal adhesion. Minor things make the sound absorbing film material more flexible. The fixing of the woven intersections by thermal adhesion may extend over the entire woven fabric, or may be performed at equal intervals vertically or horizontally, or at random partial woven intersections.

In the aspect of the sound-absorbing film material of the present invention, a bubble-containing resin layer having a density of 0.35 to 0.75 g / cm ³ is formed on one side of the fabric, and a part of the bubble-containing resin layer enters the fabric structure, The depth may be 1 to 35% with respect to the thickness of the fabric. The cell-containing resin layer is formed by coating with a foam-like composition and solidification treatment, whereby a part of the cell-containing resin layer penetrates into the woven fabric structure so that the air permeability (JIS L1096: Frazier method) is 3 to 50 cc. / Cm < ² > / sec, preferably 10 to 25 cc / cm < ² > / sec, further improving the echo attenuation effect. The sound energy is converted into heat energy and consumed by viscous friction caused by diffused reflection and vibration caused by the air vibration caused by the sound propagation to the bubble part included in the bubble-containing resin layer. For example, the foam composition is a two-pack type silicone elastomer paste (an organic solvent can be included in the viscosity modifier), a resin composition (paint) using a silicone resin emulsion, a paste sol mainly composed of a soft polyvinyl chloride resin ( For example, containing 1 to 5 parts by mass of silicone oil as a foam stabilizer), and mechanically stirring them with a stirrer (equipped with a blade made of a combination of several stainless steels and metals) to force bubbles. The wound whip is directly knife coated on one side of the fabric and solidified to simultaneously impregnate and coat the fabric. A part of the bubble-containing resin layer formed thereby is impregnated in the fabric. The maximum depth of the impregnated portion is 1 to 35% with respect to the thickness of the fabric, so that the inside of the fabric substantially contains bubbles. Further improve the sound absorption characteristics of echo attenuation effect by forming a formation. If the density of the bubble-containing resin layer exceeds 0.75 g / cm ³ , the sound absorption characteristics due to the echo attenuation effect may be insufficient. If the density is less than 0.35 g / cm ³ , the wear strength of the bubble-containing resin layer may be reduced. May be wrong.

  In particular, the bubble-containing resin layer preferably includes a vinyl chloride resin, a layered inorganic compound, and molybdenum compound particles as a main component, and a vinyl chloride resin (30-100 parts by mass of a plasticizer with respect to 100 parts by mass of the vinyl chloride resin). It is preferable that 1.5 to 10 parts by mass of the layered inorganic compound and 1.5 to 10 parts by mass of the molybdenum compound particles with respect to 100 parts by mass of the soft composition contained. As the layered inorganic compound, those described in paragraph [0017] can be used, and similarly, the molybdenum compound particles described in paragraph [0018] can be used. As a result, the sound absorption effect is improved, and at the same time, the layered inorganic compound expands in volume due to the heat of the flame during a fire, blocking the penetration of the flame and the leakage of toxic gas, and the residue of the combustion compound is strengthened by the action of the molybdenum compound particles. By forming a layer (chlorine-molybdenum composite oxide), it has nonflammability in accordance with the Building Standards Law by maintaining the interruption of flame penetration and toxic gas leakage for a long time.

  The construction of the sound absorbing film material of the present invention is performed by freely combining arbitrary standard sheets having a width of 1 m to 3 m and an arbitrary length of 1 m to 50 m, and mounting the fabric surface side of the sound absorbing film material as an acoustic incident surface. Especially 1). One sheet is about 1m to 3m in width and about 1m to 5m in length, and the sound absorbing film material is a square, rectangle, triangle, rhombus, etc. It can be used for flat ceilings and geometric 3D ceilings by fixing to the ceiling beam system or by hanging 2). In addition, a long sound-absorbing film material with a width of about 1m to 3m and a length of about 1m to 10m is fixed to the ceiling beam or aluminum pressing material on the two sides in the width direction, and the sound-absorbing film material is weighted without applying tension. It can be used for design art ceilings that are suspended in a loose semicircular arc state and express the arrangement of semicircular arcs with a number of sound-absorbing film materials 3). In addition, a single sound absorbing film material having a width of about 1 m to 3 m and a length of about 1 m to 5 m is in the form of a square, a rectangle, a triangle, a rhombus, etc. It can be used for design art ceilings that use drapes obtained by controlling tension by providing suspension nuts to the ceiling beam system using ropes and springs. 4). By applying the above construction, it can be used for purposes other than the ceiling, for example, for partitions, blinds, awning tents, etc., to ensure a corresponding sound absorbing effect.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not limited to these. First, a method for evaluating the sound absorbing film material of the present invention will be described.
<Sound absorption rate>
Using the fabric surface side of the membrane material as the sound incident surface, the noise reduction coefficient (NRC value) according to JIS A1405 (normal incidence method) was determined as the arithmetic average value of each sound absorption coefficient of 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz.
<Shared porosity>
When the sound-absorbing film material is placed horizontally and observed from the vertical direction, the upper fabric gap and the lower fabric gap overlap each other, and the shared gap that penetrates two or three fabrics is formed. The total occupancy rate per unit area was calculated from a monitor image obtained by digital microscope observation, assuming that the light transmitting portion was a shared porosity, and calculated by a computer.
<Air permeability>
JIS L1096 8.27.1 Determined by the Frazier method defined in the A method.
<Nonflammable test> (ASTM-E1354: Corn calorimeter test method)
The surface of the film material was irradiated with 50 kW / m ² of radiant heat from a radiant electric heater for 20 minutes. In this exothermic test, the total heat generation amount and the heat generation rate for 20 minutes were measured, and the appearance of the film material after the test was observed.
(A) Total calorific value: 8 MJ / m ² or less was regarded as suitable.
(B) heating speed: 10 seconds or more continuously to the Relevant not exceed 200 kW / ^{m 2.}
(C) Appearance observation: Applicable to those with no pinhole depression exceeding 0.5 mm in diameter.

[Example 1]
<Thermal expandable core-sheath yarn (1)>
A non-alkali glass multifilament yarn (filament diameter 9 μm, 400 filaments: 75 count: 687 dtex) is used as a core yarn and dipped in a liquid bath of a paste sol composition made of a soft vinyl chloride resin of the following composition 1. A soft vinyl chloride resin paste sol composition is coated on the entire circumference of the multifilament yarn and then gelled at 180 ° C. to form a resin coating layer. The ratio of height to width in the yarn cross section is 3: A thermally expandable core-sheath yarn (1) having a flat elliptical cross section of 5 was obtained.
[Formulation 1] Soft vinyl chloride resin paste sol composition Emulsion polymerization polyvinyl chloride resin (degree of polymerization 1700) 100 parts by mass 1,2-cyclohexanedicarboxylic acid diisononyl (plasticizer) 70 parts by mass * Product name: Hexamol DINCH (BASF (Made by company)
Epoxidized soybean oil (plasticizer) 5 parts by weight Barium / zinc composite compound (stabilizer) 2 parts by weight Antimony trioxide (flame retardant) 30 parts by weight Layered inorganic compound (montmorillonite: average particle size 8 μm) 10 parts by weight calcium molybdate Zinc (molybdenum compound particles) 5 parts by mass Silane coupling agent 2 parts by mass * γ-aminopropyltrimethoxysilane (100% active ingredient)
Benzotriazole (UV absorber) 0.3 part by mass Titanium oxide (white pigment) 2 parts by mass
<Weaving (1)>
Both the warp and weft yarn groups are single layer fabrics made of 2/2 Nanako (basket) fabrics with two heat-expandable core-sheath yarns (1), and the warp yarn groups are 28 per inch. [Weaving 1] having a weaving density of 30 yarns per inch and a porosity of 2%, an air permeability of 45 cc / cm ² / sec, and a mass of 860 g / m ² was obtained.

[Example 2]
<Weaving (2)>
A double woven fabric in which the driving density of the heat-expandable core-sheath yarn (1) is 42 yarns / inch as the warp group and the driving density of the heat-expandable core-sheath yarn (1) is 36 yarns / inch as the weft yarn group, Weaving the upper layer fabric structure with a 2/1 diagonal weave, the lower layer fabric structure with a 2/1 upward weaving, and connecting the upper layer fabric and the lower layer fabric with a five-line connection, weaving and sharing [Fabric 2] having a porosity of 1.2%, an air permeability of 16 cc / cm ² / sec, and a mass of 1160 g / m ² was obtained.

Example 3
<Woven (3)>
As the warp group, the driving density of the thermally expandable core-sheath yarn (1) is 28 yarns / inch, and as the bias yarn group of the left oblique upper and right oblique upper bias yarns, the driving density of the thermally expandable core sheath yarn (1) is 20 yarns / inch. The upper-layer triaxial woven fabric and the heat-expandable core-sheath yarn (1) have a driving density of 28 yarns / inch as the warp group, and the heat-expandable core-sheath yarn (1) as the upper left oblique / right oblique upper bias yarn group. A lower triaxial woven fabric having a driving density of 20 yarns / inch is connected to a lower triaxial woven fabric with a thermally expandable core-sheath yarn (1) straddling five, and a thermally expandable core-sheath yarn of the upper triaxial woven fabric. The thermal expansion core-sheath yarn (1) of the lower triaxial woven fabric is connected to the thermal expansion core-sheath yarn (1) of the upper triaxial woven fabric by connecting five wires. A woven triaxial double woven fabric [woven fabric 3] having a shared porosity of 0.5%, an air permeability of 6 cc / cm ² / sec, and a mass of 2020 g / m ² was obtained.

Example 4
<Fabric (4)>
The upper layer is a triple woven fabric in which the heat-expandable core-sheath yarn (1) has a driving density of 60 yarns / inch and the warp-expandable core-sheath yarn (1) has a drive-in number of 45 yarns / inch. 3/1 diagonal weaving with a fabric structure rising to the right, 3/1 diagonal weaving with a middle layer fabric structure, 3/1 oblique weaving with a lower layer fabric structure, upper layer fabric and middle layer fabric Are connected by a five-wire connection, and the middle layer fabric and the lower layer fabric are connected by a five-wire connection, and are woven. The common porosity is 0.1%, the air permeability is ² cc / cm ² / second, and the mass is 1555 g / m. ² [Fabric 4] was obtained.

Example 5
<Thermal expandable core-sheath yarn (2)>
The core material of the heat-expandable core-sheath yarn (1) was changed to a flat yarn of polyparaphenylene terephthalamide fiber (aramid fiber: filament diameter 12 μm, 843 dtex), and a paste sol made of a soft vinyl chloride resin with the following composition 2 After dipping into the liquid bath of the composition and coating the soft vinyl chloride resin paste sol composition on the entire circumference of the multifilament yarn, gelation treatment is performed at 180 ° C. to form a resin coating layer. A thermally expandable core-sheath yarn (2) having a flat elliptical cross section with a height: width ratio of 2: 5 was obtained.
[Formulation 2] Soft vinyl chloride resin paste sol composition Emulsion polymerization polyvinyl chloride resin (degree of polymerization 1700) 100 parts by mass 1,2-cyclohexanedicarboxylic acid diisononyl (plasticizer) 70 parts by mass * Product name: Hexamol DINCH (BASF (Made by company)
Epoxidized soybean oil (plasticizer) 5 parts by weight Barium / zinc composite compound (stabilizer) 2 parts by weight Antimony trioxide (flame retardant) 30 parts by weight Layered inorganic compound (synthetic smectite)
* Silica tetrahedron (tetracoordinate) layer and aluminum octahedron (hexacoordinate) layer are stacked alternately,
Silica / aluminum 2: 1: average particle diameter 16 μm) 10 parts by mass Calcium molybdate (molybdenum compound particles) 5 parts by mass Silane coupling agent 2 parts by mass * γ-aminopropyltrimethoxysilane (active ingredient 100%)
Benzotriazole (UV absorber) 0.3 part by mass Titanium oxide (white pigment) 2 parts by mass
<Weaving (5)>
Both the warp and weft groups are single-layered fabrics made of 2/2 Nanako (basket) fabrics with two heat-expandable core-sheath yarns (2). The warp groups consist of 28 yarns per inch. [Weaving 5] having a weaving density of 30 yarns per inch and a porosity of 2%, an air permeability of 45 cc / cm ² / sec, and a mass of 780 g / m ² was obtained.

Example 6
<Fabric (6)>
A double woven fabric in which the driving density of the heat-expandable core-sheath yarn (2) is 42 yarns / inch as the warp group and the driving density of the heat-expandable core-sheath yarn (2) is 36 yarns / inch as the weft group, Weaving the upper layer fabric structure with a 2/1 diagonal weave, the lower layer fabric structure with a 2/1 upward weaving, and connecting the upper layer fabric and the lower layer fabric with a five-line connection, weaving and sharing [Fabric 6] having a porosity of 1.2%, an air permeability of 16 cc / cm ² / sec, and a mass of 1050 g / m ² was obtained.

Example 7
<Weaving (7)>
The warp density of the thermally expandable core-sheath yarn (2) is 28 yarns / inch as the warp group, and the strike density of the thermally expandable core-sheath yarn (2) is 20 yarns / inch as the upper left oblique and right oblique upper bias yarn group. The upper layer triaxial woven fabric, and the warp density of the heat-expandable core-sheath yarn (2) is 28 yarns / inch, and the heat-expandable core-sheath yarn (2) is used as the upper left oblique / right oblique upper bias yarn group. A lower triaxial woven fabric having a density of 20 yarns / inch is connected to a lower triaxial woven fabric with a thermal expansion core / sheath yarn (2) straddling five, and the upper layer triaxial woven fabric has a thermally expandable core / sheath yarn. The thermal expansion core-sheath yarn (2) of the lower triaxial fabric is connected to the thermal expansion core-sheath yarn (2) of the upper triaxial fabric by connecting five wires. A woven triaxial double woven fabric having [woven fabric 7] having a shared porosity of 0.5%, an air permeability of 6 cc / cm ² / second, and a mass of 1820 g / m ² was obtained.

Example 8
<Woven (8)>
The upper layer is a triple woven fabric in which the density of the heat-expandable core-sheath yarn (2) is 60 yarns / inch as the warp group and the number of the heat-expandable core-sheath yarns (2) is 45 yarns / inch as the warp group. 3/1 diagonal weaving with a fabric structure rising to the right, 3/1 diagonal weaving with a middle layer fabric structure, 3/1 oblique weaving with a lower layer fabric structure, upper layer fabric and middle layer fabric Are connected by a five-wire connection, and the middle layer fabric and the lower layer fabric are connected by a five-wire connection, and are woven. The common porosity is 0.1%, the air permeability is ² cc / cm ² / second, and the mass is 1400 g / m. ² [Fabric 8] was obtained.

Example 9
<Thermal expandable core-sheath yarn (3)>
The core material of the heat-expandable core-sheath yarn (1) was changed to a flat fiber of carbon fiber (filament diameter 10 μm, 660 dtex), and the paste sol composition with a soft vinyl chloride resin of the following composition 3 was in a liquid bath After dipping and coating the soft vinyl chloride resin paste sol composition on the entire circumference of the multifilament yarn, gelation treatment is performed at 180 ° C. to form a resin coating layer. A thermally expandable core-sheath yarn (3) having a flat elliptical cross section of 2: 5 was obtained.
[Formulation 3] Soft vinyl chloride resin paste sol composition Emulsion polymerization polyvinyl chloride resin (degree of polymerization 1700) 100 parts by mass 1,2-cyclohexanedicarboxylic acid diisononyl (plasticizer) 70 parts by mass * Product name: Hexamol DINCH (BASF (Made by company)
Epoxidized soybean oil (plasticizer) 5 parts by weight Barium / zinc composite compound (stabilizer) 2 parts by weight Antimony trioxide (flame retardant) 30 parts by weight Layered inorganic compound (fluorotetrasilicon mica: 14 μm) 10 parts by weight Molybdate carbonate Calcium (molybdenum compound particles) 5 parts by mass Silane coupling agent 2 parts by mass * γ-aminopropyltrimethoxysilane (100% active ingredient)
Benzotriazole (UV absorber) 0.3 part by mass Titanium oxide (white pigment) 2 parts by mass
<Weaving (9)>
Both warp and weft yarn groups are single layer fabrics made of 2/2 Nanako (basket) fabrics with two heat-expandable core-sheath yarns (3). The warp groups are 30 weaves per inch. [Weaving 9] having a density of 32 yarns per inch and a porosity of 2.5%, an air permeability of 52 cc / cm ² / sec, and a mass of 820 g / m ² was obtained.

Example 10
<Woven (10)>
A double woven fabric in which the driving density of the heat-expandable core-sheath yarn (3) is 42 yarns / inch as the warp group and the driving density of the heat-expandable core-sheath yarn (3) is 36 yarns / inch as the weft group, Weaving the upper layer fabric structure with a 2/1 diagonal weave, the lower layer fabric structure with a 2/1 upward weaving, and connecting the upper layer fabric and the lower layer fabric with a five-line connection, weaving and sharing [Fabric 10] having a porosity of 1.4%, an air permeability of 18 cc / cm ² / sec, and a mass of 1100 g / m ² was obtained.

Example 11
<Weaving (11)>
The warp density of the thermally expandable core-sheath yarn (3) is 28 yarns / inch as the warp group, and the strike density of the thermally expandable core-sheath yarn (3) is 20 yarns / inch as the upper left oblique / right oblique upper bias yarn group. The upper-layer triaxial woven fabric and the heat-expandable core-sheath yarn (3) have a density of 28 yarns / inch as the warp group, and the heat-expandable core-sheath yarn (3) as the upper left and upper right bias yarn groups. The lower layer triaxial woven fabric having a density of 20 yarns / inch is connected to the lower layer triaxial woven fabric with the thermal expandable core-sheath yarn (3) straddling five, and the upper layer triaxial woven fabric has a thermally expandable core-sheath yarn. Connected to the line (3), and the heat-expandable core-sheath thread (3) of the lower triaxial woven fabric is connected to the heat-expandable core-sheath thread (3) of the upper triaxial woven fabric by connecting five wires. A woven triaxial double woven fabric having [woven fabric 11] having a shared porosity of 0.8%, an air permeability of 8 cc / cm ² / sec, and a mass of 1920 g / m ² was obtained. .

Example 12
<Woven (12)>
The upper layer is a triple woven fabric in which the density of the heat-expandable core-sheath yarn (3) is 60 yarns / inch as the warp group and the number of the heat-expandable core-sheath yarns (3) is 48 yarns / inch as the warp group. 3/1 diagonal weaving with a fabric structure rising to the right, 3/1 diagonal weaving with a middle layer fabric structure, 3/1 oblique weaving with a lower layer fabric structure, upper layer fabric and middle layer fabric Are connected by a five-wire connection, and the middle layer fabric and the lower layer fabric are connected by a five-wire connection, and are woven. The common porosity is 0.1%, the air permeability is ² cc / cm ² / second, and the mass is 1480 g / m. ² [woven fabric 12] was obtained.

[Examples 13 to 24]
<Formation of bubble-containing resin layer>
Whip (2 times) with soft vinyl chloride resin paste sol composition of the following formulation 4 mechanically stirred by a stirrer (equipped with a combination of 8 stainless steel wires into a teacup-shaped blade) and forcedly entrained bubbles (Foaming) is clearance-coated on one side of the 12 types of fabrics 1 to 12 obtained in Examples 1 to 12, uniformly forming a wet paint film with paste, and heated in an electric furnace at 180 ° C. for 3 minutes. Gelling treatment and adhesion treatment with the woven fabric are performed, and a bubble-containing resin layer (density 0.5 g / cm ³ ) is provided on one side of the woven fabrics 1 to 12 and 225 g / m ^{2 is} provided in the fabric structure. A membrane material of Examples 13 to 24, in which a part thereof penetrated and the depth thereof was 15 to 30% with respect to the thickness of the woven fabric, was obtained.
[Formulation 4] Paste sol composition with soft vinyl chloride resin Emulsion polymerization vinyl chloride resin (degree of polymerization 1700) 100 parts by mass 1,2-cyclohexanedicarboxylic acid diisononyl (plasticizer) 65 parts by mass * Product name: Hexamol DINCH ( (Made by BASF)
Epoxidized soybean oil (plasticizer) 5 parts by weight Barium / zinc composite compound (stabilizer) 2 parts by weight Antimony trioxide (flame retardant) 10 parts by weight Layered inorganic compound (montmorillonite: average particle size 8 μm) 10 parts by weight calcium molybdate Zinc (molybdenum compound particles) 5 parts by mass Silane coupling agent 2 parts by mass * γ-aminopropyltrimethoxysilane (100% active ingredient)
Benzotriazole (ultraviolet absorber) 0.3 part by mass Titanium oxide (white pigment) 2 parts by mass Dimethyl silicone oil (foam stabilizer) 2 parts by mass

All the woven fabrics 1 to 12 of Examples 1 to 12 have a membrane material strength that can be used for a ceiling membrane material, and are light in weight that are unlikely to cause serious human damage even in the event of a disaster. In particular, it has excellent sound absorption (JIS A1405: NRC value improvement by normal incidence method), and the NRC value is improved in comparison with the comparative example. In particular, in the case of a woven fabric having an opening of 1 to 5%, the yarn of the woven fabric undergoes volume expansion due to the heat of the ASTM-E1354: corn calorimeter test due to the effect of the present invention. Since it is closed to 1%, it is possible to close a gap through which a flame or combustion gas can leak, and to obtain a nonflammable sound absorbing film material according to the Building Standard Law. Further, in the fabrics 13 to 24 of Examples 13 to 24 in which the bubble-containing resin layer (density 0.5 g / cm ³ ) was formed on one side of the fabrics 1 to 12, the sound absorption effect (NRC value) was higher than that of the fabrics 1 to 12, respectively. ) Further improved by 0.9 to 1.3.

[Comparative Example 1]
<Woven (25)>
The woven structure of the woven fabric 1 of Example 1 was changed so that both the warp yarn group and the weft yarn group had two heat-expandable core-sheath yarns (1) as a single line. Layer fabric, warp group has a weaving density of 22 per inch, and weft group has a weaving density of 24 per inch, with a porosity of 12%, air permeability of 270 cc / cm ² / sec, and a mass of 565 g / m ² . [Fabric 25] was obtained. The [woven fabric 25] had a porosity of more than 5% and was reduced to 12%, so that the sound absorption effect was lowered, and it was not adapted to the nonflammability test. The reason is that ASTM-E1354: Although the yarn of the fabric expands in volume due to the heat of the corn calorimeter test, if the porosity of [Fabric 25] is 12%, the clogging of the fabric will not be in time due to thermal expansion. As a result, flames and combustion gases leaked from the voids that could not be closed during the combustion test.

[Comparative Example 2]
<Fabric (26)>
Except that the thermally expandable core-sheath yarn (1) of [Fabric 1] of Example 1 was changed to the core-sheath yarn (1), the woven / knitted structure was the same as that of Example 1, with a porosity of 2% and ventilation. A [woven fabric 26] having a degree of 45 cc / cm ² / sec and a mass of 860 g / m ² was obtained. [Fabric 26] had a sound-absorbing effect but did not conform to the nonflammability test. The reason for this is that the sheath part of the core-sheath thread does not contain a layered inorganic compound (montmorillonite). ASTM-E1354: The heat of the corn calorimeter test does not cause the yarn of the fabric to expand in volume. As the porosity of the [woven fabric 26] decreased and expanded 2% during the combustion test, the voids further expanded, and flames and combustion gases leaked from the voids.
<Core sheath yarn (1)>
An alkali-free glass multifilament yarn (filament diameter 9 μm, 400 filaments: 75 counts: 687 dtex) is used as a core yarn, and 10 parts by mass of layered inorganic compound (montmorillonite) from compound 1 and calcium zinc molybdate (molybdenum compound) Particles) Dipping into a liquid bath of paste sol composition according to formulation 5 with 5 parts by weight omitted, and covering the entire circumference of the multi-filament yarn with a soft vinyl chloride resin paste sol composition, followed by gelation at 180 ° C Then, a resin coating layer was formed to obtain a core-sheath yarn (1) having a flat elliptical cross section having a height: width ratio of 3: 5 in the yarn cross section.

[Comparative Example 3]
<Woven (27)>
Except for changing the thermally expandable core-sheath yarn (1) of [Fabric 2] of Example 2 to the core-sheath yarn (1), a shared porosity of 1.2 %, An air permeability of 16 cc / cm ² / sec, and a mass of 1160 g / m ² was obtained. [Fabric 27] had a sound-absorbing effect, but did not conform to the nonflammability test. The reason for this is that the sheath part of the core-sheath thread does not contain a layered inorganic compound (montmorillonite). ASTM-E1354: The heat of the corn calorimeter test does not cause the yarn of the fabric to expand in volume. As the porosity of the [woven fabric 27] increased to 1.2% during the combustion test, the void portion further expanded, and flame and combustion gas leaked from the void portion.

[Comparative Example 4]
<Woven (28)>
Except for changing the heat-expandable core-sheath yarn (1) of [Fabric 3] of Example 3 to the core-sheath yarn (1), a woven / knitted structure similar to that of Example 3 was obtained with a common porosity of 0. A triaxial double woven fabric [woven fabric 28] having 5% air permeability of 6 cc / cm ² / sec and a mass of 2020 g / m ² was obtained. [Fabric 28] had a sound-absorbing effect but did not conform to the nonflammability test. The reason for this is that the sheath part of the core-sheath thread does not contain a layered inorganic compound (montmorillonite). ASTM-E1354: The heat of the corn calorimeter test does not cause the yarn of the fabric to expand in volume. As the porosity of the [woven fabric 28] decreased to 0.5% during the combustion test, the void portion further expanded, and flame and combustion gas leaked from the void portion.

[Comparative Example 5]
<Weaving (29)>
Except for changing the thermally expandable core-sheath yarn (1) of [Fabric 4] of Example 4 to the core-sheath yarn (1), a woven / knitted structure similar to that of Example 4 was used. %, An air permeability of ² cc / cm ² / second, and a mass of 1555 g / m ² were obtained. [Fabric 29] had a sound-absorbing effect, but did not conform to the nonflammability test. The reason for this is that the sheath part of the core-sheath thread does not contain a layered inorganic compound (montmorillonite). ASTM-E1354: The heat of the corn calorimeter test does not cause the yarn of the fabric to expand in volume. As the porosity of 0.1% of [woven fabric 29] was increased during the combustion test, the voids further expanded, and flames and combustion gases leaked from the voids.

[Reference Example 1]
<Thermal expandable core-sheath yarn (4)>
A non-alkali glass multifilament yarn (filament diameter 9 μm, 400 filaments: 75 count: 687 dtex) is used as a core yarn, and dipped in a paste sol composition liquid bath of a soft vinyl chloride resin of compound 1 to make soft vinyl chloride The resin paste sol composition is coated on the entire circumference of the multifilament yarn, and then gelled at 180 ° C. to form a resin coating layer. A thermally expandable core-sheath yarn (4) having a cross section was obtained.
<Woven (30)>
As a woven or knitted structure similar to Example 1, except that the thermally expandable core-sheath yarn (1) of [Fabric 1] of Example 1 is changed to a thermally expandable core-sheath yarn (4), the porosity is 5 % [Woven fabric 30] having an air permeability of 90 cc / cm ² / sec and a mass of 860 g / m ² was obtained. The porosity was increased by the difference in the cross-sectional shape of the thermally expandable core-sheath yarn, and thereby the sound absorption effect was slightly lower than that of the fabric 1 of Example 1.

  According to the present invention, a ceiling area constituting membrane material (membrane ceiling) and a sound-absorbing membrane material installed on the ceiling of a building, or a ceiling accessory (aerial membrane) having a void portion related to air permeability and sound absorption Regardless, in the event of a fire, the fabric voids are almost blocked, and a sound-absorbing film material that has an excellent shielding effect against flames and toxic gas leaks and ensures safety for evacuation can be obtained. As well as indoor ceiling stadiums, gymnasiums, indoor pools, event halls, public halls, ceremonial occasions, station buildings, airports, shopping malls and other membrane ceiling constructions, optical ceiling membrane constructions, as well as partitions, blinds, awnings It can also be applied to tents.

1: Sound absorbing film material 2: Fabric 2-1: Single layer fabric 2-2: Double fabric 2-3: Triple fabric 2-4: Cavity 3: Thermally expandable core-sheath yarn 3-1: Multifilament yarn (Core yarn)
3-2: Resin coating layer (coating)

Claims (5)

It is a woven fabric having a porosity of 1 to 5% including a heat-expandable core-sheath yarn in a woven or knitted element, wherein the core portion of the heat-expandable core-sheath yarn is a multifilament yarn, and the sheath portion contains a layered inorganic compound A sound-absorbing film material, wherein the porosity of the woven fabric is closed to less than 1% by thermal expansion of a sheath portion of the thermally expandable core-sheath yarn.   The sound-absorbing film material according to claim 1, wherein the layered inorganic compound is at least one selected from a smectite clay mineral, a synthetic smectite, sericite, fluorine mica, and expanded graphite.   The sound-absorbing film material according to claim 1 or 2, wherein the thermoplastic resin composition layer includes a soft vinyl chloride resin and molybdenum compound particles.   The weaving and knitting elements are 1) a warp group and a weft group, or 2) a warp group and an upper left / upward bias yarn group, and the fabric is a single layer fabric, a double fabric, and a triple fabric. The sound-absorbing film material according to any one of claims 1 to 3, which is any one selected from woven fabrics. 5. The heat-expandable core-sheath yarn has a flat elliptical cross section, and the ratio of height: width in the flat elliptical cross section is 3: 4 to 1: 4. Sound absorbing film material.