JP7656345B2 - Light-gathering and soundproofing sheet - Google Patents

Description

The present invention relates to a light-transmitting, soundproofing sheet with excellent visibility. More specifically, it relates to a light-transmitting, soundproofing sheet that is used as a safety sheet to enclose the entire construction site for the construction or demolition of buildings, condominiums, houses, and other structures, a privacy sheet to enclose noise-generating equipment inside and outside factories, a sheet shutter at the entrances and exits of factories, a partition sheet within a factory, etc. In particular, it relates to a light-transmitting, soundproofing sheet that has excellent visibility of people's shadows on the other side of the sheet and also blends in well with the landscape.

During the construction, large-scale repair, and even demolition of buildings and condominiums, a large-scale scaffolding is set up and the entire building is enclosed with architectural protection mesh sheets, architectural protection sheets, etc., for the purpose of work safety (Industrial Safety and Health Regulations: Scaffolding, etc.), for the purpose of safety of surroundings and passersby such as preventing falling objects (Building Standards Act Enforcement Order, Industrial Safety and Health Regulations), and to prevent dust scattering and odor diffusion in the neighborhood. The architectural protection mesh sheets (e.g., Hiraoka Ori-sen Co., Ltd. "Tarpo Screen" trademark, Class 1 and Class 2) and architectural protection sheets (e.g., Hiraoka Ori-sen Co., Ltd. "Tarpo Canvas" trademark, Class 1 and Class 2) used for this enclosure are generally lightweight and strong flame-retardant standard certified products (Fire Service Act Enforcement Order) and JIS A8952 "Construction Work Sheet" compliant products made by processing polyester fiber fabric with soft polyvinyl chloride resin, and are easy to handle at construction sites because they are freely foldable. In particular, in demolition work of buildings, etc., the operating noise of heavy machinery and demolition noise are loud and the noise is often continuous, so it is necessary to surround the entire building with soundproof sheets, soundproof panels, etc. This soundproof sheet is a type of architectural curing sheet, and is a heavy tarpaulin (for example, Hiraoka Ori-sen Co., Ltd.'s "Trademark: Sound Shutter") that has an areal density of 1 to ³ kg/ ^m2 and is several times the mass of general architectural curing sheets. The higher the areal density of the sheet (mass per m2), the higher the sound transmission loss (soundproofing) can be obtained, so in early soundproof sheets, a large amount of high-specific gravity powder such as iron powder and iron oxide was filled to increase the areal density, but the excessive weight of the sheet caused an excessive load to be applied to the eyelet connection parts of the connection body of many sheets installed on site, resulting in the problem of the eyelet parts being destroyed. In addition, while general-purpose architectural curing sheets have a certain degree of light-gathering properties and a sense of openness, a work site surrounded by heavy, light-blocking soundproof sheets was a dim and claustrophobic environment.

The applicant previously proposed a sheet (Patent Document 1) with surface density of 0.8 to 3.5 kg/m2, which is made by using a mesh sheet as a base material, which is covered with a high-specific gravity resin layer containing a high-specific gravity inorganic filler, and forming a transparent resin layer of a flexible polymer material (preferably containing a flame retardant) on the surface, as a soundproof sheet with consideration for ^daylighting . This invention of a daylighting soundproof sheet ensures a certain degree of sound transmission loss (soundproofing) in the mesh sheet area covered with the high-specific gravity resin layer, and at the same time ensures a certain degree of daylighting with the transparent resin layer that covers and fills the voids in the mesh sheet. After the standardization of daylighting soundproof sheets (for example, Hiraoka Ori-sen Co., Ltd.'s "Trademark: Sound Shutter" daylighting), the demand at construction sites these days is for daylighting soundproof sheets with added visibility that allows the state of the work site and people's shadows to be confirmed from outside the enclosure, from the viewpoint of crime prevention and safety management. In order to design an architectural protection mesh sheet that satisfies the need for improved visibility to grasp from the outside the actions and safety conditions of construction personnel and others within the enclosure of such a construction site, the applicant has disclosed that the thermoplastic resin layer on the front side of the mesh sheet has a substantially arc-shaped cross section with a hue of Munsell lightness 4 or less (Patent Document 2), and in paragraph [0017] lists as examples of hues with Munsell lightness 4 or less: black, black-gray, black-brown, black-green, black-blue, black-purple, dark navy blue, dark green, maroon, blue, green, red, gray, etc. In addition, the applicant has disclosed a design for a film material for sheet shutters, partitions, and sheet structures that has excellent visibility to enable identification of the indoor environment, facial features, and objects through the sheet when looking into a dimly lit room from the bright outdoors through the sheet, by using a mesh sheet with a Munsell brightness of 4 or less as a base, providing transparent resin layers on the front and back sides of the sheet, making the through holes of the mesh into transparent resin mirror parts with an area of 25 ^mm2 to 225 ^mm2 (haze value of 10 or less), and setting the total occupancy rate of the transparent resin mirror parts to 35 to 75% (Patent Document 3), and citing the same colors as in Patent Document 2 as examples of dark colors with a Munsell brightness of 4 or less.

It is true that the architectural protection mesh sheet of Patent Document 2 and the membrane material for sheet shutters of Patent Document 3 improve the visibility of the inside by creating a visual effect in which the hue of the mesh sheet is Munsell value 4 or less. However, the drawback is that the absolute requirement of using a sheet (membrane material) that is entirely dark (black) makes it too noticeable and difficult to harmonize with the surrounding environment. Therefore, in recent years, there has been a demand for a light-transmitting soundproof sheet that allows visibility of people's shadows and the like, and that also blends in appropriately with the scenery.

JP 2003-221888 A JP 2015-004215 A JP 2018-167498 A

The objective of the present invention is to provide a soundproof sheet that provides a good balance between visibility of people's shadows, lighting, and harmony with the landscape.

In order to solve the above problems, we discovered that a flexible sheet made by providing a chlorine atom-containing resin coating layer on both sides of fabric A (a fabric using yarns of a specific Munsell lightness for the warp or weft and yarns of a different Munsell lightness for the other direction) or fabric B (a fabric using yarns of a specific Munsell lightness and yarns of a different Munsell lightness mixed in a specific ratio for the warp and weft) that satisfies certain requirements has a good balance of visibility of people's shadows, lighting, and harmony with the landscape, and also has excellent soundproofing properties, which led to the completion of the present invention.

That is, the light-receiving, sound-proof sheet of the present invention is a flexible sheet having a surface density of 1.0 to 2.5 kg/m ² and a total light transmittance (JIS K7105) of 35 to 65%, which comprises a coarse-grained substrate and chlorine-atom-containing resin coating layers on both sides thereof, and the coarse-grained substrate is a woven fabric having a void ratio of 20 to 45% due to entanglement of warp threads (5 to 15 threads/inch) and weft threads (5 to 15 threads/inch), and this woven fabric has: A) the warp threads or weft threads have a Munsell value of V (JIS Z8721) Fabric A, which contains at least half of yarns ranked 1, 2, 3, or 4, and yarns in the other direction having a Munsell value V (same as above) of 8 or 9, or B) Fabric B, which is composed of a mixture of warp yarns and weft yarns ranked 1, 2, 3, or 4, and yarns having a Munsell value V (same as above) of 8 or 9, with the ratio of the number of the mixed yarns being regularly alternated at a ratio of 1:1 to 1:2. This makes it possible to obtain a soundproof sheet with a good balance between visibility, lighting, and harmony with the landscape.

In the light-transmitting, sound-proofing sheet of the present invention, it is preferable that the yarn having a Munsell value V (JIS Z8721) rank of 1, 2, 3, or 4 is a dope-dyed yarn, a pre-dyed yarn, or a colored yarn. This improves visibility on the other side of the light-transmitting, sound-proofing sheet.

In the light-transmitting, soundproofing sheet of the present invention, the colored yarn is preferably a yarn having a coating layer mainly composed of a vinyl chloride resin, a plasticizer, and a colorant. This improves visibility on the other side of the light-transmitting, soundproofing sheet.

In the light-transmitting, soundproofing sheet of the present invention, the chlorine atom-containing resin coating layer is preferably composed mainly of a chlorine atom-containing resin having a chlorine atom content of 56.7 to 73.1% by mass, chlorinated paraffin having a chlorine atom content of 29 to 49% by mass, and a plasticizer. By making the chlorine atom-containing resin coating layer heavier, a higher sound transmission loss (soundproofing) can be obtained.

According to the present invention, it is possible to obtain a sheet that has a good balance between visibility of people's shadows, lighting, and harmony with the landscape, and also has excellent soundproofing properties. Therefore, the light-receiving and soundproofing sheet of the present invention can be used as a safety sheet to be stretched over the entire construction site for the construction or demolition of buildings, condominiums, houses, and other structures, a privacy sheet to be stretched around noise-generating equipment inside and outside a factory, a sheet shutter at the entrances and exits of a factory, a partition sheet within a factory, etc.

FIG. 1 shows an example of the light-transmitting, sound-proof sheet (fabric A) of the present invention. FIG. 1 shows an example of the light-transmitting, sound-proof sheet (fabric A) of the present invention. FIG. 1 shows an example of the light-transmitting, soundproof sheet (woven fabric B) of the present invention. FIG. 1 shows an example of the light-transmitting, soundproof sheet (woven fabric B) of the present invention.

The light-transmitting, sound-proof sheet of the present invention is a flexible sheet having a surface density of 1.0-2.5 kg/ ^m2 and a total light transmittance (JIS K7105) of 35-65%, which comprises a coarse-grained substrate and chlorine-atom-containing resin coating layers on both sides of the substrate. The chlorine-atom-containing resin coating layers are mainly composed of a chlorine-atom-containing resin having a chlorine atom content of 56.7-73.1% by mass, chlorinated paraffin having a chlorine atom content of 29-49% by mass, and a plasticizer. The coarse-grained substrate is woven fabric A or woven fabric B having a void ratio of 20-45% due to entanglement of warp threads (5-15 threads/inch) and weft threads (5-15 threads/inch). Fabric A is composed of warp yarns or weft yarns containing more than half of yarns having a Munsell value V (JIS Z8721) rank of 1, 2, 3, or 4, and yarns in the other direction having a Munsell value V (JIS Z8721) rank of 8 or 9. Fabric B is composed of warp yarns and weft yarns containing a mixture of yarns having a Munsell value V (JIS Z8721) rank of 1, 2, 3, or 4 and yarns having a Munsell value V (JIS Z8721) rank of 8 or 9, and the ratio of the number of the mixed yarns is regularly alternated at 1:1 to 1:2. The yarns having a Munsell value V (JIS Z8721) rank of 1, 2, 3, or 4 are dope-dyed yarns, pre-dyed yarns, or colored yarns. The colored yarns are yarns having a coating layer mainly composed of a vinyl chloride resin, a plasticizer, and a colorant.

The coarse-grained substrate used in the light-transmitting, sound-proof sheet of the present invention is Fabric A or Fabric B. Fabric ^A is a fabric having a void ratio of 20-45% and a mass of 75-250 g/m2 due to the entanglement of warp threads (5-15 threads/inch) and weft threads (5-15 threads/inch), in which more than half of the warp threads or weft threads have a Munsell value V (JIS Z8721) rank of 1, 2, 3, or 4, and the threads in the other direction have a Munsell value V (JIS Z8721) rank of 8 or 9. Fabric B is a fabric with a void ratio of 20 to 45% due to the entanglement of warp yarns (5 to 15 yarns/inch) and weft yarns (5 to 15 yarns/inch), and is composed of a mixture of warp yarns and weft yarns with a Munsell value of V (same as above) of 1, 2, 3, or 4 and a mixture of yarns with a Munsell value of V (same as above) of 8 or 9, with the ratio of the number of the mixed yarns being regularly alternated at 1:1 to 1:2. These coarse-textured base materials are composed of solid parts occupied by yarns and void parts formed between the yarns, with the number of void parts being 16 to 225 per square inch, and the total occupancy rate of the solid parts relative to the unit area (1 square inch) of the coarse-textured base material being 55 to 80% (the total occupancy rate of the void parts being 20 to 45%). The weave structure of Fabric A and Fabric B is preferably a plain weave, a gauze weave, a basket weave, or a leopard weave (gauze, or ro, or lattice), with the plain weave being particularly excellent in the balance of warp and weft properties of the resulting soundproof sheet, and the gauze weave being excellent in the shape stability of the coarse substrate (Fabric A or Fabric B) and less likely to cause misalignment, resulting in a stable appearance quality of the light-receiving, soundproof sheet. The fiber type of Fabric A and Fabric B is preferably a synthetic fiber such as polypropylene, polyethylene, vinylon, polyester (polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, polytrimethylene terephthalate, polynaphthalene terephthalate, etc.), aromatic polyester, nylon, aromatic polyamide, or carbon fiber, with polyethylene terephthalate (PET) being particularly preferred, and one having a phosphate ester component copolymerized in the polymer main chain being preferred as it has high flame retardancy. PET fibers may be derived from petrochemical resources (conventional petrochemical products), biomass (using bioethanol produced by fermenting sugarcane waste molasses as the starting material for monomer synthesis), recycled (recycled PET bottles), or depolymerized. Depolymerized PET fibers are regenerated fibers obtained from regenerated polyester obtained by polymerization of regenerated monomers (terephthalic acid, dimethyl terephthalate, bis 2-hydroxyethyl terephthalate) obtained by depolymerizing polyester fibers.

The warp and weft yarns of Fabric A and Fabric B can be in any form, such as multifilament, staple fiber spun, monofilament, split yarn, tape yarn, etc., but multifilament yarns are preferred because they have the best strength. In particular, yarns that have been treated with a water repellent agent such as a silicon compound, paraffin compound, or fluorine compound to prevent water absorption are preferred, as the water absorption prevention treatment prevents rainwater from entering the light-gathering soundproofing sheet through its cross section due to capillary action and prevents mold from growing inside the sheet. In addition, multifilament yarns that have been treated with a cyclic phosphonic acid ester for flame retardancy are preferred, as this improves the flame retardancy of the light-gathering soundproofing sheet and makes it easier to comply with the flame retardant standards of the Fire Service Act. The multifilament yarn preferably has a large diameter of 500 (555 dtex) to 2000 (2222 dtex) denier, particularly 750 (834 dtex) to 1500 (1666 dtex) denier, and the thread density (threads/inch) of the warp and weft is preferably 5 to 15 threads/inch (2.54 cm) of these multifilament yarns to form a plain weave or a mosaic weave. Mosaic weave yarns are woven in a (3 threads)/1 thread entanglement, so that one apparent thread is actually made up of three threads, but the number of threads in the mosaic weave is counted as one thread, with three threads counted together as the appearance. When the yarn density in plain weave is 5 yarns/inch, the yarn is preferably 1500 (1665 dtex) to 2000 (2222 dtex) denier, and when it is 18 yarns/inch, the yarn is preferably 500 (555 dtex) to 1000 (1111 dtex) denier. When the yarn density in mosaic weave is 5 yarns/inch, one apparent yarn is preferably composed of three yarns of 500 (555 dtex) to 1000 (1111 dtex) denier. The maximum apparent yarn density in mosaic weave using three yarns of 500 (555 dtex) to 1000 (1111 dtex) denier is about 8 yarns/inch. If the yarn density exceeds 10 yarns/inch, the void ratio to ensure light collection and visibility may be insufficient. The void ratio of Fabric A and Fabric B must be 20-45% to ensure lighting and visibility. If the void ratio is less than 20%, it tends to be difficult to ensure lighting and visibility, and if the void ratio exceeds 45%, soundproofing tends to decrease. The void ratio (degree of opening) is calculated by subtracting the total area of the threads in a unit area of Fabric A and Fabric B (for example, a square of 1 inch vertical x 1 inch horizontal) as a percentage from 100 (x 100%), and can be measured from an enlarged copy or calculated from the thickness of the threads.

The woven fabric A uses warp or weft yarns that at least have a Munsell value V (JIS Z8721) rank of 1, 2, 3, or 4 (the closer to 1, the darker the color) and a hue of black or black-gray, or a Munsell value V rank of 1, 2, 3, or 4 and a Munsell chroma (JIS Z8721) rank of 6, 7, or 8 (the closer to 8, the brighter the color), with hues such as black-brown, black-green, black-blue, gray-purple, navy gray, gray-green, and gray-orange. Specifically, when a yarn with a Munsell value V of 1 (or 2, or 3, or 4) is used for the warp (weft), this yarn may constitute all of the warp yarns, or may constitute a part of the warp (weft). Examples of the latter are a 1:1 alternating arrangement with a Munsell value V of 8 (or 9), a regular alternating arrangement with 2:1, a regular alternating arrangement with 3:2, etc. And the yarn in the other direction has a Munsell value V (same as above) of rank 8 or 9 (the closer to 9, the whiter it is) and a white hue (including white due to diffuse reflection). In the case of Fabric A, the ratio of the weft density to the warp yarn is 5:4 to 4:5, and the contrast effect within this ratio allows for both the sheet's harmony with the scenery and the visibility of people's shadows behind the sheet. Fabric B uses yarns for the warp and weft, which are regularly alternately arranged in a ratio of 1:1 to 1:2, with a Munsell value V (JIS Z8721) of 1, 2, 3, or 4 (the closer to 1, the darker the color), with a hue ranging from black to dark gray, yarns for Munsell value V of 1, 2, 3, or 4 and Munsell chroma (JIS Z8721) of 6, 7, or 8, with a hue ranging from black-brown, black-green, black-blue, gray-purple, gray-navy, gray-green, gray-orange, etc., and yarns for Munsell value V (JIS Z8721) of 8 or 9, with a hue ranging from white (including white due to diffuse reflection). The contrast effect within this ratio allows for both the appearance harmony of the sheet and visibility behind the sheet. The regular alternating arrangement of dark (black) and white colors in a ratio of 1:1 to 1:2 that produces such an effect is preferably "1:1", "2:3", or "1:2" in plain weave or Mosaic weave, and particularly in the case of "1:2" in Mosaic weave, the three threads that make up one yarn may be one dark (black) thread and two white threads. In Fabric A and Fabric B, "white" refers to uncolored (semi)transparent multifilaments that appear white as a whole due to diffuse reflection, as well as coloring with white pigment only and pastel colors obtained by adding a small amount of pigment to a white pigment. Furthermore, yarns with hues of black, black-gray, black-brown, black-green, black-blue, gray-purple, gray-navy, gray-green, gray-orange, etc. can be dyed yarns (melt-spun from a colored resin), pre-dyed yarns (melt-spun from an uncolored resin and dyed with a dye), or colored yarns (coated yarns impregnated with a liquid colored resin composition), but in any case, black made only with a black pigment or black dye is particularly preferred.

Black pigments used for dyed and colored yarns include carbon black, aniline black, titanium black, etc., with carbon black being the most preferred. The black pigment is used at a concentration of 1 to 10% by mass, preferably 1 to 5% by mass, based on the mass of the thermoplastic resin that is the base of the dyed yarn, or at a concentration of 1 to 10% by mass, preferably 1 to 5% by mass, based on the mass of the thermoplastic resin that is the base of the colored resin composition that colors the yarn. At this time, within the range of ranks 1, 2, 3, and 4 of Munsell value V (JIS Z8721), any pigment other than black pigment can be used in combination, or a combination of pigments other than black can be used to design black-gray, black-brown, black-green, black-blue, gray-purple, gray-navy, gray-green, gray-orange, etc. Examples of carbon black include furnace black, channel black, thermal black, acetylene black, and lamp black. Furnace black obtained by the incomplete combustion method is particularly preferred. Furnace black is easy to control the small particle size structure and has excellent spinnability for black spun yarn. Furnace black obtained by the oil furnace method is preferable for producing furnace black. On the other hand, hues such as black gray, black brown, black green, black blue, gray purple, gray navy blue, gray green, and gray orange can be toned by using a known organic pigment or inorganic pigment in combination with a black pigment. Organic pigments include azo pigments (insoluble monoazo, insoluble disazo, azo lake, condensed azo, and metal complex azo), phthalocyanine pigments (phthalocyanine blue, phthalocyanine green), dye lake pigments (acid dye lake, basic dye lake), condensed polycyclic pigments (anthraquinone pigments, thioindigo pigments, perinone pigments, perylene pigments, quinacridone pigments, dioxazine pigments, isoindolinone pigments, quinophthalone pigments, and isoindoline pigments), and others such as nitroso pigments, alizarin lake pigments, and aniline pigments. Inorganic pigments include metal oxides, metal sulfides, metal sulfates, metal carbonates, metal hydroxides, metal chromates, spinel-type oxides, and rutile-type oxides. For yarn-dyed yarns, black dyes such as Color Index International: C.I. Acid Black 2, 7, 24, 26, 31, 52, 63, 112, and 118, C.I. Direct Black 17, 19, 32, 51, 71, 108, 146, 154, and 168, C.I. Basic Black 2, and C.I. Food Black 1 and 2 are used to dye yarns melt-spun from uncolored resin. In addition, black dyes can be used in combination with any dye, or in combination with dyes other than black, to design black-gray, black-brown, black-green, black-blue, gray-purple, gray-navy, gray-green, gray-orange, and other colors.

Among these, the colored yarn is a yarn having a coating layer mainly composed of a vinyl chloride resin, a plasticizer, and a colorant (paragraph [0018]), and the coating layer is impregnated into all or part of the gaps between the filaments of the multifilament yarn and fixed thereto. Examples of vinyl chloride resins include vinyl chloride resin, chlorinated vinyl chloride resin, vinyl chloride-vinyl acetate copolymer, acrylic craft vinyl chloride resin, and urethane graft vinyl chloride resin, and vinyl chloride resin having a degree of polymerization of 1000 to 2000 by emulsion polymerization is preferred for use in paste sol compositions. Examples of the plasticizer include adipic acid dialkyl ester compounds, sebacic acid dialkyl ester compounds, phthalic acid (1,2-, 1,3-, or 1,4-) dialkyl ester compounds (DHP, DEHP, DINP, DNP, etc.), cyclohexane (1,2-, 1,3-, or 1,4-) dicarboxylate compounds, 4-cyclohexene (1,2-, 1,3-, or 1,4-) dialkyl ester compounds, trimellitic acid ester compounds, phosphate triester compounds, polyester compounds, chlorinated paraffin having a chlorine atom content of 29 to 49% by mass, and epoxidized soybean oil. A paste sol is prepared by blending 40 to 100 parts by mass of the vinyl chloride resin with 100 parts by mass of the vinyl chloride resin. This coating layer is formed by coating or dipping the yarn with a paste sol mainly composed of a vinyl chloride resin, a plasticizer, and a colorant, and is turned into a film by heat gelation. The coating layer may contain known additives such as stabilizers (metal soaps such as barium and zinc, tin mercapto, etc.), flame retardants (bromine compounds, metal hydroxides, metal oxides, phosphate compounds, etc.), UV absorbers (benzodenone compounds, triazine compounds, benzotriazole compounds, etc.), and fillers (barium sulfate, antimony trioxide). The mass ratio of the yarn to the coating layer is 1:2 to 1:5, and the coating layer contains particularly high specific gravity barium sulfate (specific gravity 4.4), antimony trioxide (specific gravity 5.7), zinc oxide (specific gravity 5.4), iron oxide (specific gravity 5.2), lead oxide (specific gravity 9.35), etc., and the sound transmission loss of the light-receiving, sound-proofing sheet can be improved by using a high specific gravity coating layer with a mass ratio close to 1:5. When the unit mass (g/m ² ) of the multifilament yarn is taken as 100, the mass of the coating layer is 200 to 500% of the mass of the multifilament yarn. At this time, a part of the coating layer penetrates into the voids in the multifilament yarn and fills them partially or entirely.

The chlorine atom-containing resin coating layer used in the light-receiving, sound-proof sheet of the present invention is mainly composed of a chlorine atom-containing resin having a chlorine atom content of 56.7 to 73.1% by mass, chlorinated paraffin having a chlorine atom content of 29 to 49% by mass, and a plasticizer (paragraph [0019]). The chlorine atom-containing resin having a chlorine atom content of 56.7% is vinyl chloride resin (suspension polymerization with a polymerization degree of 800 to 1500): -[CH ₂ -CHCl] _n -, the chlorine atom-containing resin having a chlorine atom content of 73.1% by mass is chlorinated vinyl chloride resin having a chlorination degree of 100%: -[CHCl-CHCl] n - or vinylidene chloride: -[CH ₂ -CCl ₂ ] n -, and the chlorine atom-containing resin having a chlorine atom content of 68.1 to 72.2% by mass also includes a combination of vinyl chloride resin and chlorinated vinyl chloride resin in a mass ratio of 10:1 to 1:3. The chlorinated polyvinyl chloride resin can be controlled to a chlorination degree of 1 to 100% (chlorine atom content of 73.1% by mass) by adjusting the conditions for blowing chlorine into the polyvinyl chloride resin. In particular, in order to obtain a higher sound transmission loss by making the specific gravity of the chlorine atom-containing resin coating layer large, it is preferable to use a large amount of chlorinated polyvinyl chloride resin with a chlorination degree of 50% or more (chlorine atom content of 64.9% by mass or more) -[CH ₂ -CHCl]m-[CHCl-CHCl]n-, particularly one with a high specific gravity of a chlorination degree of 70 to 95% (chlorine atom content of 68.2 to 72.3% by mass). Here, in all the above chemical formulas, m and n are integers representing the degree of polymerization. The chlorine atom-containing resin coating layer may include a composition containing a chlorine atom-containing resin, 1 to 30 parts by mass of chlorinated paraffin having a chlorine atom content of 29 to 49% by mass, and 20 to 60 parts by mass of a plasticizer (paragraph [0019]) per 100 parts by mass of the chlorine atom-containing resin as essential components, and further containing the stabilizer and ultraviolet absorber described in paragraph [0019]. The chlorinated paraffin acts as a flame retardant plasticizer, and has a higher specific gravity than general-purpose plasticizers, making the chlorine atom-containing resin coating layer heavier, thereby obtaining a higher sound transmission loss. The composition is formed by calendar rolling or T-die extrusion to obtain a (film) sheet having a thickness of 0.15 to 0.75 mm and a total light transmittance (JIS K7105) of 80% or more, and is used as the chlorine atom-containing resin coating layer. The (film) sheet is laminated on at least one side, preferably both sides, of the coarse-grained substrate (woven fabric A, woven fabric B) to completely cover the coarse-grained substrate. When the unit mass (g/m ² ) of the coarse-grained substrate is taken as 100, the mass of the chlorine-atom-containing resin coating layer is 250 to 500% of the mass of the coarse-grained substrate. At this time, a part of the chlorine-atom-containing resin coating layer penetrates into the voids of the coarse-grained substrate, filling them partially or entirely.

By laminating a (film) sheet having a thickness of 0.15 to 0.75 mm and a total light transmittance (JIS K7105) of 80% or more on one or more sides, preferably both sides, of the coarse-grained substrate (woven fabric A, woven fabric B), a light-receiving, sound-proof sheet having voids with an area of 1.0 mm ² to 10 mm ² each, in which each through-hole of the coarse-grained substrate is filled with a part of the (film) sheet, is obtained. The total light transmittance (JIS K7105) of this void is 70 to 96%, and the total occupancy rate of the voids is 20% (placement density 15 strands/inch) to 45% (placement density 5 strands/inch). The surface density of the light-receiving, sound-proof sheet is preferably 1.0 to 2.5 kg/m ² and the total light transmittance (JIS K7105) is 35 to 65%. In this light-receiving and soundproofing sheet, the solid part occupied by the threads of the coarse substrate is configured as "chlorine atom-containing resin coating layer/coarse substrate" or "chlorine atom-containing resin coating layer/coarse substrate/chlorine atom-containing resin coating layer", and the voids formed between the threads are "chlorine atom-containing resin coating layer" or "chlorine atom-containing resin coating layer/chlorine atom-containing resin coating layer". The sum of the total light transmittance of this solid part and the total light transmittance of the voids is the total light transmittance of the light-receiving and soundproofing sheet of the present invention. If the total light transmittance (JIS K7105) of the sheet is less than 35%, the light-receiving property is poor and the visibility of the shadow of a person on the other side of the sheet is also poor. Similarly, if the total occupancy rate of the voids of the soundproofing sheet is less than 20%, the light-receiving property is poor and the visibility of the shadow of a person on the other side of the sheet tends to be poor. On the other hand, if the total light transmittance of the sheet exceeds 65%, the soundproofing property is poor, and similarly, if the total occupancy rate of the voids of the sheet exceeds 45%, the soundproofing property tends to be poor. Also, if the surface density of the sheet is less than 1.0 kg/ ^m2 , the soundproofing property is poor, while if it exceeds 2.5 kg/ ^m2 , the sheet becomes excessively heavy, and transportation and handling of the sheet during installation may be difficult.

The light-transmitting soundproof sheet of the present invention is preferably a rectangle with a width of 1.5 to 2.4 m and a length of 3 to 6 m per unit, and is particularly preferable for its excellent handling properties, with a width of 1.5 to 2.1 m and a length of 3.4 to 5.1 m. The light-transmitting soundproof sheet of the present invention can be used in combination with a conventional soundproof sheet (not having light-transmitting properties) to enclose a construction site as necessary, and the combination method can be an alternating vertical line enclosing, an alternating horizontal line enclosing, or a checkered pattern. When enclosing the light-transmitting soundproof sheet alone or in combination with a conventional product, it is preferable to detachably connect the eyelet holes with tools such as strings, connecting clips, or polyethylene cable ties, and further detachably fix the ends of adjacent soundproof sheets with hook-and-loop fasteners or the like to fill the gaps between the sheets. The light-transmitting soundproof sheet of the present invention can be printed with a "soundproof" mark, just like a conventional soundproof sheet. Conventional soundproofing sheets are printed with light-blocking black ink, but the light-transmitting soundproofing sheet of the present invention uses light-transmitting colored semi-transparent ink or colored transparent ink, which is preferable so as not to impair light transmission. The purpose of printing the "soundproofing" mark is to prevent noise caused by the printed marking, to notify the site, and to avoid confusion with general construction curing sheets and misuse.

The light-receiving soundproof sheet of the present invention can be provided with an antifouling layer on the surface in order to prevent the image of the sheet from being negatively affected by the adhesion and dirt of dust that flies around at demolition sites, and to prevent the light-receiving property of the light-receiving soundproof sheet from being reduced. There are no limitations on the method of formation or material of this antifouling layer, so long as it does not impair the light-receiving property and landscape harmony of the sheet. For example, a coating film formed by applying and drying a resin solution such as an acrylic resin or a fluorine-based copolymer resin, a coating film containing silica fine particles or colloidal silica in these, a sol-gel coating film containing an organosilicate and/or its condensate, a sol-gel coating film containing a photocatalytic inorganic material (e.g., photocatalytic titanium oxide), a multilayer film whose outermost surface is formed of a fluorine-based resin and laminated by adhesive or heat melt processing, etc. can be appropriately selected and used.

The light-receiving, soundproof sheet of the present invention will be described with reference to Figures 1 to 4. Figure 1 shows a light-receiving, soundproof sheet (1) made of yarn (2) with a Munsell value V (JIS Z8721) rank of 1, 2, 3, or 4 as the warp yarn, and yarn (3) with a Munsell value V (JIS Z8721) rank of 8 or 9 as the weft yarn. Figure 2 shows a light-receiving, soundproof sheet (1) made of the above yarn (3) as the warp yarn and the above yarn (2) as the weft yarn. Figure 3 shows a light-receiving, soundproof sheet (1) made of the above yarns (2) and (3) as the weft yarn in a 1:1 ratio and alternately used, and the above yarns (2) and (3) as the weft yarn in a 1:1 ratio and alternately used. FIG. 4 shows a light-transmitting, sound-proof sheet (1) in which the weft yarns are made of the above yarns (2) and (3) in a ratio of 1:2 and in a repeating unit of "(2)(3)(3)" and the weft yarns are made of the above yarns (2) and (3) in a ratio of 1:2 and in a repeating unit of "(2)(3)(3)". Here, the yarns (2) are either dope-dyed yarns (2-1), pre-dyed yarns (2-2), or colored yarns (2-3). Note that the chlorine-containing resin coating layer (4) is omitted in FIGS. 1 to 4.

The present invention will be described in detail below with reference to examples, but the present invention is not limited thereto. The test methods used in the examples and comparative examples of the present invention are as follows.
(1) Areal density (mass)
The mass (kg) per unit area (m ² ) was measured, and this value was taken as the areal density (kg/m ² ).
(2) Total Light Transmittance The total light transmittance was measured in accordance with JIS K7105.
(3) Soundproofing (sound transmission loss)
The soundproofing properties of the sheet were evaluated by the sound transmission loss at a center frequency of 1000 Hz according to JIS A 1416 "Laboratory sound transmission loss measurement method", and the effect was compared with that of a conventional soundproof sheet. The sound transmission loss of the conventional soundproof sheet (Comparative Example 1: surface density 1.32 kg/ ^m2 ) is 16 dB at 1000 Hz.
(4) Flame retardancy (JIS A8952)
(5) Visibility A test sheet was stretched over the second floor balcony of an apartment building (3 to 6 m above ground: indoor lighting OFF), and with the front side of the test sheet exposed to direct midday sunlight (October, Soka City, Saitama Prefecture), 1 to 5 adult males (wearing gray work clothes with Munsell value 6 and Munsell chroma 6) walked around on the balcony in random numbers. Five observers stood with their backs to the sun and evaluated the accuracy of the number of people visually identified from a distance of 10 m.
1: All five people saw the correct number of people. 2: One person saw the wrong number. 3: Two or more people saw the wrong number.

[Example 1]
Coarse substrate (1)
The coarse-grained substrate (1) used was a woven gauze fabric with a void ratio of 25% due to the entanglement of warp yarns (apparent 7 yarns/inch) and weft yarns (apparent 7 yarns/inch) and a mass of 205 g/ ^m2 , in which each warp yarn was composed of one apparent black yarn (Munsell value: 1) made of three black (furnace black) dyed polyester (PET) multifilament yarns (750 denier: 833 dtex) strands (Munsell value: 1), and each weft yarn was composed of one apparent white (diffuse reflection) yarn (Munsell value: 9) made of three uncolored polyester (PET) multifilament yarns (750 denier: 833 dtex) strands (Munsell value: 9).
Light-transmitting and soundproofing sheet (1)
The chlorine atom-containing resin composition of the following [Formulation 1] was kneaded at 180°C and calendar rolled to produce a transparent sheet with a thickness of 0.35 mm, a mass of 588 g/ ^m2 , and a total light transmittance (JIS K7105) of 88%. This was then hot-pressed laminated to both sides of a coarse-grained substrate (1) as a chlorine atom-containing resin coating layer (chlorine atom content 56.7%) to obtain a light-transmitting, soundproof sheet (1) with a thickness of 1.0 mm, an areal density of 1381 g/ ^m2 , and a total light transmittance (JIS K7105) of 44%.
[Formulation 1] <Chlorine atom-containing resin composition>
Vinyl chloride resin (degree of polymerization 1300: chlorine atom content 56.7%) 100 parts by weight Diisononyl phthalate (plasticizer) 40 parts by weight Chlorinated paraffin (chlorine atom content 41.2% by weight: specific gravity 1.16) 20 parts by weight Barium-zinc-based composite PVC stabilizer 4 parts by weight Triazine-based ultraviolet absorber 0.3 parts by weight

[Example 2]
Coarse substrate (2)
The coarse-grained substrate (2) used was a gauze fabric with a void ratio of 25% and a mass of 205 g/ ^m2 due to the entanglement of warp yarns (apparent 7 yarns/inch) and weft yarns (apparent 7 yarns/inch), in which each warp yarn was composed of one apparent white (diffuse reflection) yarn (Munsell value: 9) made of three uncolored polyester (PET) multifilament yarns (750 denier: 833 dtex) (Munsell value: 9), and each weft yarn was composed of one apparent black yarn (Munsell value: 1) made of three black (furnace black) dyed polyester (PET) multifilament yarns (750 denier: 833 dtex) (Munsell value: 1).
Light-transmitting and soundproofing sheet (2)
The chlorine atom-containing resin composition of the following [Formulation 2] was kneaded at 180°C and calendar rolled to produce a transparent sheet with a thickness of 0.35 mm, a mass of 640 g/ ^m2 , and a total light transmittance (JIS K7105) of 83%. This was then hot-pressed laminated to both sides of a coarse-grained substrate (2) as a chlorine atom-containing resin coating layer (chlorine atom content 64.1%) to obtain a light-transmitting, soundproof sheet (2) with a thickness of 1.0 mm, an areal density of 1484 g/ ^m2 , and a total light transmittance (JIS K7105) of 41%.
[Formulation 2] <Chlorine atom-containing resin composition>
Vinyl chloride resin (degree of polymerization 1300: chlorine atom content 56.7%) 50 parts by weight Chlorinated vinyl chloride resin (degree of chlorination 90%: chlorine atom content 71.5%) 50 parts by weight Diisononyl phthalate (plasticizer) 40 parts by weight Chlorinated paraffin (chlorine atom content 41.2% by weight: specific gravity 1.16) 20 parts by weight Barium-zinc-based composite PVC stabilizer 4 parts by weight Triazine-based ultraviolet absorber 0.3 parts by weight

[Example 3]
Coarse substrate (3)
The coarse-grained base material (3) used was a woven gauze fabric with a void ratio of 25% and a mass of 205 g/ ^m2 due to the entanglement of warp yarns (apparent 7 yarns/inch) and weft yarns (apparent 7 yarns/inch). The warp yarns and weft yarns were a mixture of one apparent black yarn (Munsell value: 1) consisting of three black (furnace black) dope-dyed polyester (PET) multifilament yarns (750 denier: 833 dtex) strands (Munsell value: 1), and one apparent white (diffuse reflection) yarn (Munsell value: 9) consisting of three uncolored polyester (PET) multifilament yarns (750 denier: 833 dtex) strands (Munsell value: 9), with the former black yarn and the latter white yarn being arranged in an alternating ratio of 1:1 in number.
Light-transmitting and soundproofing sheet (3)
A transparent sheet having a thickness of 0.35 mm, a mass of 588 g/ ^m2 , and a total light transmittance (JIS K7105) of 88% made from [Formulation 1] in Example 1 was used, and this was heat-pressurized laminated to both sides of a coarse-grained substrate (3) as a chlorine atom-containing resin coating layer (chlorine atom content: 56.7%) to obtain a light-transmitting, soundproofing sheet (3) having a thickness of 1.0 mm, an areal density of 1381 g/ ^m2 , and a total light transmittance (JIS K7105) of 44%.

[Example 4]
Coarse substrate (4)
The coarse-grained base material (4) used was a woven fabric having a void ratio of 25% and a mass of 205 g/ ^m2 due to the entanglement of warp yarns (apparent 7 yarns/inch) and weft yarns (apparent 7 yarns/inch). The warp yarns and weft yarns were a mixture of one apparent black yarn (Munsell value: 1) consisting of three black (furnace black) dope-dyed polyester (PET) multifilament yarns (750 denier: 833 dtex) strands (Munsell value: 1), and one apparent white (diffuse reflection) yarn (Munsell value: 9) consisting of three uncolored polyester (PET) multifilament yarns (750 denier: 833 dtex) strands (Munsell value: 9). The ratio of the number of the former black yarns to the latter white yarns was 1:2, and the base material (4) was configured in a repeating arrangement of "black yarns/white yarns/white yarns".
Light-transmitting and soundproofing sheet (4)
A transparent sheet having a thickness of 0.35 mm, a mass of 640 g/ ^m2 , and a total light transmittance (JIS K7105) of 83% made from [Formulation 2] in Example 2 was used, and this was heat-pressurized laminated to both sides of a coarse-grained substrate (4) as a chlorine atom-containing resin coating layer (chlorine atom content 64.1%) to obtain a light-transmitting, soundproof sheet (4) having a thickness of 1.0 mm, an areal density of 1484 g/ ^m2 , and a total light transmittance (JIS K7105) of 50%.

[Example 5]
Coarse substrate (5)
A coarse-grained substrate (5) was used in which the black yarn consisting of three black (furnace black) dyed polyester (PET) multifilament yarns (750 denier: 833 dtex) (Munsell lightness: 1) in the coarse-grained substrate (1) in Example 1 was replaced with a black yarn consisting of three black (furnace black) dyed polyester (PET) multifilament yarns (750 denier: 833 dtex) (Munsell lightness: 1). The coarse-grained substrate (5) is a twill fabric having a void ratio of 21% and a mass of 325 g/ ^m2 , which is entangled with black warp yarns (apparent 7 yarns/inch) and uncolored, non-resin-processed (diffuse reflection) white weft yarns (apparent 7 yarns/inch).
Black dyed polyester (PET) multifilament yarn Uncolored polyester (PET) multifilament yarn (750 denier: 833 dtex) was coated with the black paste vinyl chloride resin sol of the following [Recipe 3], and heated at 180°C for 1 minute to gel the paste sol, thereby obtaining a polyester (PET) multifilament yarn (750 denier: 833 dtex) having a black (furnace black) colored coating layer. The mass ratio of the uncolored polyester (PET) multifilament yarn to the black colored coating layer was 1:2.8.
[Formula 3] <Black paste polyvinyl chloride resin sol>
Vinyl chloride resin (degree of polymerization 1700: emulsion polymerization) 100 parts by weight Diisononyl phthalate (plasticizer: DINP) 45 parts by weight Chlorinated paraffin (chlorine atom content 41.2% by weight: specific gravity 1.16) 20 parts by weight Barium-zinc composite stabilizer 4 parts by weight Antimony trioxide (flame retardant: specific gravity 5.7) 5 parts by weight Barium sulfate (specific gravity 4.4) 10 parts by weight Furnace black (carbon black pigment) 5 parts by weight Benzotriazole ultraviolet absorber 0.2 parts by weight Light-receiving soundproof sheet (5)
A transparent sheet having a thickness of 0.35 mm, a mass of 588 g/ ^m2 and a total light transmittance (JIS K7105) of 88% made from [Formulation 1] in Example 1 was used, and this was heat-pressurized laminated onto both sides of a coarse-grained substrate (5) as a chlorine atom-containing resin coating layer (chlorine atom content: 56.7%) to obtain a light-transmitting, soundproof sheet (5) having a thickness of 1.0 mm, an areal density of 1501 g/ ^m2 and a total light transmittance (JIS K7105) of 42%.

[Example 6]
Coarse substrate (6)
A coarse-grained substrate (6) was used in which the black yarn consisting of three black (furnace black) dyed polyester (PET) multifilament yarns (750 denier: 833 dtex) (Munsell lightness: 1) in the coarse-grained substrate (3) of Example 3 was replaced with a black yarn consisting of three black (furnace black) dyed polyester (PET) multifilament yarns (750 denier: 833 dtex) (Munsell lightness: 1) in the form of one apparent yarn (Munsell lightness: 1) (Example 5). The coarse-grained substrate (6) is a gauze fabric having a void ratio of 23% and a mass of 325 g/ ^m2 , which is formed by intertwining warp threads (apparently 7 threads/inch) and weft threads (apparently 7 threads/inch). The warp threads and weft threads are a mixture of black-colored threads and white threads that are uncolored and non-resin-treated (diffuse reflection), with the number ratio of black threads to white threads being 1:1 and arranged alternately.
Light-transmitting and soundproofing sheet (6)
A transparent sheet having a thickness of 0.35 mm, a mass of 640 g/ ^m2 , and a total light transmittance (JIS K7105) of 83% made from [Formulation 2] in Example 2 was used, and this was heat-pressurized laminated to both sides of a coarse-grained substrate (6) as a chlorine atom-containing resin coating layer (chlorine atom content 64.1%) to obtain a light-transmitting, soundproof sheet (6) having a thickness of 1.0 mm, an areal density of 1605 g/ ^m2 , and a total light transmittance (JIS K7105) of 40%.

[Comparative Example 1]
Coarse substrate (7)
A 25% porosity, 205 g/m 2 woven fabric was used, in which all of the warp yarns of the coarse-grained substrate (1) of Example 1, consisting of three black dope-dyed (furnace black) polyester (PET) multifilament yarns (750 denier: 833 dtex) (Munsell value: 1) and one apparent black yarn (Munsell value: 1) consisting of three uncolored polyester (PET) multifilament yarns (750 denier: 833 dtex) (Munsell value: 9), were replaced with one apparent white yarn (Munsell value: 9) consisting of ^three uncolored polyester (PET) multifilament yarns (750 denier: 833 dtex). A light-receiving, sound-proof sheet (7) with a thickness of 1.0 mm, an areal density of 1381 g/m ² and a total light transmittance (JIS K7105) of 58% was obtained in the same manner as in Example 1, except that this coarse-grained substrate (7) was used. This light-receiving, sound-proof sheet (7) had excellent lighting properties and landscape harmony, but was poor in visibility.

[Comparative Example 2]
Coarse substrate (8)
A 25% porosity, 205 g/m 2 woven fabric was used, in which all of the weft yarns of the coarse-grained substrate (1) of Example 1, consisting of three uncolored polyester (PET) multifilament yarns (750 denier: 833 dtex) (Munsell value: 9) with an apparent white (diffuse reflection) yarn (Munsell value: 9), were replaced with one apparent black yarn (Munsell value: 1) consisting of three black dope-dyed (furnace black) polyester (PET) multifilament yarns (750 denier: 833 dtex) (Munsell value: 1). A light-receiving, sound-proof sheet (8) with a thickness of 1.0 mm, an areal density of 1381 g/m ² and a total light transmittance (JIS K7105) of 37%, was obtained in the same manner as in Example ¹ , except that this coarse-grained substrate (8) was used. This light-receiving, sound-proof sheet (8) had excellent visibility, but was poor in landscape harmony.

[Comparative Example 3]
Coarse substrate (9)
A light-receiving, sound-proof sheet (9) having a thickness of 1.0 mm, an areal density of 1501 g/m 2 and a total light transmittance (JIS K7105) of 43% was obtained in the same manner as in Example 5, except that all of the black yarns consisting of three black (furnace black)-colored polyester (PET) multifilament yarns (750 denier: 833 dtex) (Munsell lightness: 1) of the coarse-grained substrate (5) in Example 5 were replaced with a gray yarn consisting of three gray (furnace black/titanium oxide ⁾ -colored polyester (PET ⁾ multifilament yarns (750 denier: 833 dtex) (Munsell lightness: 6) of an apparent one (Munsell lightness: 6). This light-receiving, sound-proof sheet (9) had excellent landscape harmony, but poor visibility.

[Comparative Example 4]
Coarse substrate (10)
The same procedure as in Example 4 was used except that the ratio of the number of threads of the yarn group of one apparent black thread (Munsell value: 1) consisting of three black (furnace black) dyed polyester (PET) multifilament yarns (750 denier: 833 dtex) (Munsell value: 1) and the yarn group of one apparent white (diffuse reflection) thread (Munsell value: 9) consisting of three uncolored polyester (PET) multifilament yarns (750 denier: 833 dtex) (Munsell value: 9) in the coarse-grained substrate (4) in Example 4 was changed from 1:2 to 1:4, and a gauze fabric with a void ratio of 25% and a mass of 205 g/ ^m2 was used, which was configured in a repeating arrangement of "black thread/white thread/white thread/white thread/white thread". The thickness was 1.0 mm, the surface density was 1484 g/ ^m2 , and the total light transmittance (JIS This light-receiving, sound-proof sheet (10) was excellent in light-receiving property and harmony with the scenery, but was poor in visibility.

[Comparative Example 5]
Substrate (11)
A soundproof sheet (11) having a thickness of 1.0 mm, an areal density of 1442 g/m2 and a total light transmittance (JIS K7105) of 1.5% was obtained in the same manner as in Example 1, except that the warp yarns (apparently 7 yarns/inch ⁾ of the coarse-grained substrate (1) in Example 1 were changed to an apparent weave density of 9 yarns/inch and the weft yarns (apparently 7 yarns/inch ⁾ were changed to an apparent weave density of 9 yarns/inch. The soundproof sheet (11) had an excellent harmony with the landscape, but was poor in terms of lighting and visibility.

[Comparative Example 6]
A daylighting sheet (12) having a thickness of 1.0 mm, surface density of 921 g/ ^m2 and a total light transmittance (JIS K7105) of 36% was obtained in the same manner as in Example 1, except that the chlorine atom-containing resin coating layer (chlorine atom content 56.7%) having a thickness of 0.35 mm, mass of 588 g/m2 and total light transmittance (JIS K7105) of 88% in Example ¹ was replaced with a polyethylene resin coating layer (chlorine atom content 0%) having a thickness of 0.35 mm, mass of 358 g/ ^m2 and total light transmittance (JIS K7105) of 72%. This daylighting sheet (12) had excellent visibility and landscape harmony, but was poor in soundproofing and flame retardancy.

According to the present invention, it is possible to obtain a sheet that has a good balance between visibility of people's shadows, lighting, and harmony with the landscape, and also has excellent soundproofing properties. Therefore, the light-receiving and soundproofing sheet of the present invention can be used as a safety sheet to be stretched over the entire construction site for the construction or demolition of buildings, condominiums, houses, and other structures, a privacy sheet to be stretched around noise-generating equipment inside and outside a factory, a sheet shutter at the entrances and exits of a factory, a partition sheet within a factory, etc.

1: Light-transmitting, sound-proofing sheet 2: Yarn with a Munsell value V rank of 1, 2, 3, or 4 3: Yarn with a Munsell value V rank of 8 or 9 4: Coarse-grained substrate 5: Chlorine-containing resin coating layer (5 is omitted in the front views of Figures 1 to 4)

Claims (4)

A flexible sheet having a surface density of 1.0 to 2.5 kg/m ² and a total light transmittance (JIS K7105) of 35 to 65%, which comprises a coarse-grained substrate and chlorine-atom-containing resin coating layers on both sides thereof, said coarse-grained substrate being a woven fabric having a void ratio of 20 to 45% due to entanglement of warp threads (5 to 15 threads/inch) and weft threads (5 to 15 threads/inch), said woven fabric comprising: A) the warp threads or weft threads each having a Munsell value of V (JIS A light-receiving, sound-proofing sheet characterized in being either: 1) Fabric A, the majority of which is composed of yarns having a Munsell value V (same as above) of 1, 2, 3, or 4, and the yarns in the other direction having a Munsell value V (same as above) of 8 or 9; or B) Fabric B, the warp yarns and weft yarns of which are composed of a mixture of yarns having a Munsell value V (same as above) of 1, 2, 3, or 4, and yarns having a Munsell value V (same as above) of 8 or 9, the ratio of the numbers of the mixed yarns being regularly alternatingly arranged at a ratio of 1:1 to 1:2. The light-transmitting, sound-proofing sheet according to claim 1, wherein the yarn having a Munsell value V (JIS Z8721) rank of 1, 2, 3, or 4 is a dope-dyed yarn, a yarn-dyed yarn, or a colored yarn. 3. The light-receiving , sound-proof sheet according to claim 2, wherein the colored yarn is a yarn having a coating layer mainly composed of a vinyl chloride resin, a plasticizer, and a colorant. The light-transmitting, soundproofing sheet according to any one of claims 1 to 3, wherein the chlorine-atom-containing resin coating layer is mainly composed of a chlorine-atom-containing resin having a chlorine atom content of 56.7 to 73.1% by mass, a chlorinated paraffin having a chlorine atom content of 29 to 49% by mass, and a plasticizer.