Mesh sheet excellent in dimensional stability balance between warp and weft

Abstract

To provide a mesh sheet which is used as a sheet or the like for use in a liftable sheet shutter device installed at an entrance of a factory or a warehouse, and which is excellent in dimensional stability balance between warp and weft.SOLUTION: The mesh sheet has a void ratio of 10 to 33% and a mass of 350 to 10mm2 / 650g, has a large number of voids (area: 1 to m2), and has an air permeability corresponding to a wind pressure resistance of 9 to 10m / 12kg at a wind speed of m2 / sec, and a 10% tensile stress in a widthwise direction of the mesh sheet (according to the JISL1096A method) is 90 to 110% of a 10% tensile stress in a longitudinal direction of the mesh sheet (according to the JISL1096A method).SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a mesh sheet used for a lift-up / opening / closing sheet shutter device installed at the entrances and exits of factories and warehouses, as well as safety enclosures and facade enclosures at construction sites for building construction, renovation, demolition, etc., pergolas (opening / closing ceiling accordion or slat-opening sunshades), furling shades (opening / closing swivel-rolling sunshades), etc. [Background technology]

[0002] Sensor-activated automatic lifting and closing sheet shutter devices are installed at the entrances and exits of factories, warehouses, and other facilities for forklifts, transport robots, and transport drones. Recently, a type of shutter with a highly visible black mesh core and transparent thermoplastic resin sheets laminated on both sides, with the coarse mesh serving as a viewing window, has become increasingly popular as it is highly effective in preventing head-on collisions. Sheet shutters are also expected to prevent rain from blowing into factories and warehouses, prevent the intrusion of small flying insects (phototactic pests), insects, and other foreign objects, and to prevent the adhesion of dust and debris by controlling static electricity generated by the lifting and lowering (rolling / unrolling) of the shutter. The applicant has proposed sheet shutters with the functions described in Patent Document 1 (visibility), Patent Document 2 (insect repellent), and Patent Document 3 (antistatic). Meanwhile, factories and warehouses can become accustomed to conditions where sufficient ventilation cannot be maintained due to the accumulation of distinctive odors (volatilized chemical substances) resulting from manufacturing and other products. Depending on the chemicals that cause this odor, it can cause health problems such as dizziness, headaches, asthma, allergies, rashes, and poor physical condition, so adequate ventilation measures are necessary. However, ventilation equipment mainly consists of fans installed on the walls near the ceiling of the factory, which only allow the odors that circulate and rise within the factory to escape from a position close to the ceiling, and the larger the factory, the more fans are required. The most efficient ventilation for humans is to roll up sheet shutters in two or more places and leave the entrances and exits open to create an air flow path, but this ventilation method is inadequate because it allows small flying insects, and at night, phototactic pests, insects, and mice to enter and cause foreign objects to get into the product.

[0003] The openings of these sheet shutters are about 1m to 10m wide and 2m to 6m high. For openings with particularly large widths and heights, a long sheet of about 1m to 2m wide (for example, "Tomei Tarpo (trademark) ET-1600H" manufactured by Hiraoka Ori Sen Co., Ltd., 204cm wide x 30m long, 0.86mm thick, 900g / m) is used. 2 : A white PVC coated mesh (4mm x 4mm gap section with transparent PVC film laminated on both sides) is used, and the length direction of the original sheet is tailored to the width of the opening, and the height of the opening is tailored to the width of the original sheet, so multiple original sheets are joined with lap joints according to the height of the opening to expand the size. The width direction of the opening of the sheet shutter made by this expansion is the length direction of the original sheet, and the warp threads of the original sheet are aligned, and the height direction of the opening is the width direction of the original sheet, and the weft threads of the original sheet are aligned. Generally, the warp threads are aligned 、 In continuous processing of raw sheets containing fabrics consisting of weft yarns and weft yarns, tension is applied in the processing direction (winding direction), resulting in a tendency for the raw sheets to shrink in width due to stretching. Therefore, after processing, raw sheets tend to shrink in length and expand in width, resulting in a tendency for the shutter to return to its original shape. Repeated opening, closing, and raising / lowering of the sheet shutter gradually increases the length of the shutter beyond its initial design, causing problems with sagging when closed. To address this issue, the width direction of the opening is aligned with the length direction of the raw sheet, and the warp yarns are aligned along the height direction of the opening, ensuring dimensional stability in the raising / lowering direction. However, with this method, the longer the opening width, the greater the number of width joints in the raw sheet. The thicker width joints (where the ends of two raw sheets overlap) increase the winding diameter during winding and protrude beyond the opening / closing device, making them unsuitable for storage. On the other hand, in the case of specifications where the width direction of the opening is the length direction of the original roll, the number of width joints is small and the width joints are also in the width direction of the opening, so they do not have much effect on the roll diameter when wound up, but sagging over time due to dimensional changes in the lifting direction is a difficult issue.This sagging is more noticeable and appears as a serious problem in mesh sheets, so large-sized sheet shutter devices with a mesh base were not practical.

[0004] On the other hand, for sheet materials used for soundproofing at construction sites such as building construction, renovation and demolition, and for facades that conceal the front of buildings (print decoration), a woven fabric core is laminated on both sides with thermoplastic resin sheets, integrating them into a single sheet with a mass of 800 to 1300 g / m. 2 Soundproofing sheets (for example, Hiraoka Ori Sen Co., Ltd.'s "Sound Shutter (trademark) series, 190cm wide) are used, and for example, one piece is a 180cm wide x 340cm long sewn product with grommets, and these are expanded up, down, left, and right by connecting the grommets to create a large enclosure. In order to ensure soundproofing, the inside of the enclosure is an enclosed environment cut off from the outside world at construction sites such as building construction and demolition, except for the open part at the top, and the closer to the ground, the worse the ventilation, and in addition to dust, heat and chemicals (paint, resin building materials) are trapped. Since odors from buildings such as these can build up, there is a demand for entrances and exits that lower the ambient temperature at the site and allow for effective ventilation in the summer. On the other hand, for sunshade structures such as pergolas (opening and closing bellows ceiling or slat-opening sunshades) and furling shades (opening and closing swivel winding sunshades), mesh sheets made of resin-treated coarse woven fabric (for example, Hiraoka Ori-sen Co., Ltd.'s "Light Screen (trademark) series, shading rate 73-85%, 200cm width") are used. These mesh sheets also Like the raw sheet for sheet shutters, mesh sheets are tensioned longitudinally for manufacturing reasons, which can lead to dimensional changes after use. This raises concerns about sagging over time in pergolas, furling shades, and other applications that are repeatedly opened and closed in a specific direction. Furthermore, in outdoor applications, the texture of the mesh sheet hardens in winter, making it bulky when folded and stored, making it difficult to open and close. Furthermore, the resin layer covering the mesh sheet can become brittle and crack at temperatures below freezing, creating a need for mesh sheets with cold-resistant flexibility. The applicant has proposed a mesh shade (Patent Document 4) for use on glass windows and balconies, which provides adequate lighting and breathability, heat insulation, and excellent dust and dirt removal. Furthermore, a mesh sheet (Patent Document 5) for use as a protective mesh, balcony shade, or indoor window sunshade screen, which has a repellent effect against flying pests, but these proposals do not consider the balance of longitudinal and longitudinal dimensional stability. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-167498 [Patent Document 2] Japanese Patent Application Laid-Open No. 2018-166454 [Patent Document 3] Japanese Patent Application Laid-Open No. 2018-167499 [Patent Document 4] Japanese Patent Application Laid-Open No. 2015-093392 [Patent Document 5] Japanese Patent Application Laid-Open No. 2015-071838 Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention addresses the need to provide a mesh sheet that has excellent balance of longitudinal dimensional stability and is used in lift-up and open / close type sheet shutter devices installed at the entrances and exits of factories and warehouses, as well as in entrances and exits of safety enclosures at construction sites such as building construction, renovation and demolition, facade enclosures, pergolas (opening and closing ceiling accordion type or opening and closing slat type shade shelves), furling shades (opening and closing swivel roll-up type sunshades), etc. [Means for solving the problem]

[0007] As a result of extensive research and consideration of the above points, the present invention has been developed to provide a flame-retardant ... 2 ) with a porosity of 10 to 33% and a mass of 350 to 650 g / m 2 A mesh sheet with a wind resistance of 9 to 12 kg / m at a wind speed of 10 m / s. 2and the stress (based on JIS L1096A) when the mesh sheet is tensile at 10% in the width direction is 90 to 110% of the stress (based on JIS L1096A) when the mesh sheet is tensile at 10% in the longitudinal direction, which led to the completion of the present invention. 2 This prevents flying pests from entering through gaps, while at the same time ensuring sufficient breathability for ventilation with a porosity of 10-33%. Therefore, this mesh sheet can be used for lift-up and retractable sheet shutter devices, entrances and exits of safety enclosures for building construction, renovation, demolition, and other construction work, facade enclosures, pergolas (ceiling accordion-opening or slat-opening sunshades), furling shades (swivel-opening sunshades), etc.

[0008] The mesh sheet of the present invention preferably has a flame-retardant resin coating layer containing a near-infrared reflective metal oxide, which provides a heat-shielding effect. In particular, a heat-shielding coefficient pf of 40% or more can provide heat-shielding properties of about 1 to 3°C for sheet shutters, construction site safety enclosures, facade enclosures, pergolas, furling shades, etc., and can be used as a measure against heatstroke in factories, construction sites, under pergolas, furling shades, etc.

[0009] In the mesh sheet of the present invention, the flame-retardant resin coating layer contains an antistatic substance, and the surface resistivity (in accordance with JIS K7194) is 10 9 It is preferable to set the resistance to Ω / □ or less to provide an added dust adhesion prevention effect. This prevents static electricity from building up when the sheet is wound up and unwound when the sheet shutter is opened and closed, preventing foreign matter such as dust and dirt from adhering (and entering the facility). It also improves the removal of dust that accumulates on the inner walls of gaps caused by ventilation in sheet shutters, construction site safety enclosures, facade enclosures, pergolas, swivel-opening furling shades, etc.

[0010] The mesh sheet of the present invention preferably has an insect repellent effect in which the flame-retardant resin coating layer contains a pyrethroid compound and the KT50 knockdown time (the time required for 50% of the test insects to be suppressed and unable to get up regardless of whether they are dead or alive) against flying pests is within 30 minutes at room temperature. 2 Although flying pests cannot physically pass through the gaps in the mesh sheet, they may be attracted by the light and land in large numbers on the mesh sheet. In such cases, the presence of pyrethroid compounds knocks down and eliminates flying pests, or acts as a shield that keeps them away from the mesh sheet due to its repellent effect.

[0011] The mesh sheet of the present invention contains rubber crosslinks throughout the flame-retardant resin coating layer, imparting cold-flexibility. The rubber crosslinks are preferably condensates of a liquid synthetic rubber having either a -COOH group or an -OH group at the molecular end with a polyisocyanate compound, and the liquid synthetic rubber is preferably one or more selected from butadiene-based, isoprene-based, and farnesene-based rubbers. The composite formation of these rubber crosslinks enhances the flex resistance of the sheet when it is wound up and unwound during opening and closing of the sheet shutter, as well as its cold-flexibility. Furthermore, in pergolas, swivel-open furling shades, and the like, the mesh sheet is smoother when folded and stored, particularly in winter, and its cold-flexibility is enhanced.

[0012] In the mesh sheet of the present invention, the base fabric is preferably made of multifilament yarns spun from a synthetic resin, and the synthetic resin is preferably one of the following: 1) synthesized from a monomer that does not contain the radioactive carbon atom C14, 2) synthesized from a monomer that contains the radioactive carbon atom C14, 3) obtained by repolymerizing monomers recovered from the depolymerization of a synthetic resin molded product, or 4) obtained by melting a synthetic resin molded product. 1) is a base fabric made from a synthetic resin obtained by polymerizing monomers synthesized from petroleum-derived raw materials, 2) is a carbon-neutral base fabric made from a synthetic resin obtained by polymerizing monomers derived from biomass, 3) is a chemically recycled base fabric made from a synthetic resin obtained by repolymerizing monomers recovered from the depolymerization of recycled products, and 4) is a base fabric made from a synthetic resin recycled by melting one or more of 1) to 3). [Effects of the Invention]

[0013] The present invention makes it possible to obtain a mesh sheet with excellent balance of dimensional stability in the warp and weft directions, which can be used as a sheet material for lift-up and open-close sheet shutter devices installed at the entrances and exits of factories and warehouses, as well as for safety enclosures and facade enclosures at construction sites such as building construction, renovation and demolition, as well as for pergolas (open-close shade shelves) and swivel-open furling shades, and can also be used in combination with conventional sheet materials as a partial replacement for the above-mentioned conventional uses. DETAILED DESCRIPTION OF THE INVENTION

[0014] The mesh sheet of the present invention has a plain weave, twill weave, or imitation weave fabric as a base fabric, and a flame-retardant resin coating layer is provided on the entire surface of this base fabric, and has a large number of voids (area 1 to 10 mm 2 ) with a porosity of 10 to 33% and a mass of 350 to 650 g / m 2 A mesh sheet with a wind resistance of 9 to 12 kg / m at a wind speed of 10 m / s. 2and the stress (based on JIS L1096A) at 10% tension in the width direction of the mesh sheet is 90 to 110% of the stress (based on JIS L1096A) at 10% tension in the longitudinal direction; particularly an embodiment in which the flame-retardant resin coating layer contains a near-infrared reflective metal oxide to impart a heat-shielding effect; particularly an embodiment in which the flame-retardant resin coating layer contains an antistatic substance to impart a soot and dust adhesion prevention effect; particularly an embodiment in which the flame-retardant resin coating layer contains a pyrethroid compound to impart an insect repellent effect; particularly an embodiment in which rubber crosslinks are contained throughout the flame-retardant resin coating layer to impart cold-resistant flexibility; particularly an embodiment in which the base fabric is made of multifilament yarn obtained by spinning a synthetic resin, and is any one of: 1) not containing the radioactive carbon atom C14; 2) containing the radioactive carbon atom C14; 3) obtained by repolymerizing a depolymerized monomer; and 4) obtained by melting a synthetic resin molding.

[0015] In the mesh sheet of the present invention, the base fabric is composed of multifilament yarns spun from synthetic resin, and the synthetic resin is either 1) synthesized from a monomer that does not contain the radioactive carbon atom C14, 2) synthesized from a monomer that contains the radioactive carbon atom C14, 3) synthesized by repolymerizing monomers recovered from the depolymerization of a synthetic resin molded product, or 4) synthesized by melting a synthetic resin molded product. Examples of suitable synthetic resins include thermoplastic resins such as polypropylene, polyethylene, polyvinyl alcohol, nylon (e.g., 6-nylon, 6,6-nylon, 610-nylon), and polyester (e.g., polyethylene terephthalate, polynaphthalene terephthalate, and polyethylene furanoate). Polyester (e.g., polyethylene terephthalate, polynaphthalene terephthalate, and polyethylene furanoate) is particularly preferred, as it has excellent load creep properties as a fiber. The multifilament yarn is a bundle of 50 to 500 filaments and may be a staple spun yarn or a (colored or uncolored) resin-coated yarn. The multifilament yarn can be uncolored (natural) or a colored, solution-dyed yarn, or a combination of these. To prevent holes caused by collisions with equipment or objects, particularly in sheet shutter devices and construction site enclosures for construction and demolition work, a high-strength base fabric can be used in which part or all of the yarn constituting the base fabric is replaced with multifilament yarns such as wholly aromatic polyester, wholly aromatic polyamide, or aromatic heterocyclic polymers (polybenzimidazole, polybenzoxazole, polybenzothiazole, and copolymers thereof).

[0016] 1) is a base fabric made of synthetic resin obtained by polymerization of monomers synthesized from petroleum-derived raw materials. Specifically, it is a petroleum-derived base fabric woven from multifilament yarns melt-spun from polyethylene terephthalate obtained by polycondensation of dimethyl terephthalate (petroleum-derived) or terephthalic acid (petroleum-derived) with ethylene glycol (petroleum-derived). 2) is a carbon-neutral base fabric made of synthetic resin obtained by polymerization of biomass-derived monomers. Specifically, it is a plant-derived base fabric woven from multifilament yarns melt-spun from polyethylene terephthalate obtained by polycondensation of dimethyl terephthalate (plant-derived) or terephthalic acid (plant-derived) with ethylene glycol (plant-derived). C-14 is a radioactive carbon atom with a mass number of 14 and a half-life of 5,370 years, formed by the conversion of nitrogen by cosmic rays. It is found in nature (especially in plants and animals) with a C-14C / C-12 = 1.2 x 10 -12 It is always present in equilibrium and cannot be contained in fossil fuels that are already hundreds of millions of years old. -12 Fabrics made from fibers with detectable concentrations are certified as biomass (plant-derived). Plant-derived refers to chemicals synthesized using sugars and fats as starting materials. The concentration of the carbon isotope C-14 (the ratio of C-14 to C-12 in the polymer) contained in the total carbon atoms that make up the fiber is measured using an accelerator mass spectrometry, and the biomass content is determined by the C-14 detection ratio. 3) is a chemically recycled fabric made from synthetic resins obtained by repolymerizing monomers from depolymerized recycled products. Specifically, it is a fabric woven from multifilament yarns melt-spun from polyethylene terephthalate, which is made by repolymerizing ethylene glycol with terephthalic acid recovered from depolymerized polyethylene terephthalate products. 4) is a fabric made from synthetic resins recycled by melting one or more of 1) to 3).

[0017] Multifilament yarn is a plain weave fabric (two-strand basket weave) made by using yarns (uncolored or dyed) with a fineness of 125 to 2000 denier (139 to 2222 dtex) as warp and weft yarns, which are made by stretching 3 to 5 times the length of long fiber spun yarns (50 to 500 filaments) made by extruding and spinning thermoplastic resins such as nylon and polyester (uncolored or dyed) from a spinneret, and twisting the resulting yarns 0 to 200 times / m. It has a void ratio of 12-35% and a mass of 75-300g / m2, and has many voids (approximately square in shape) woven by either a twill weave (a basic weave in which the warp threads cross over two or three weft threads and pass under one weft thread), or a twill weave (a basic weave in which the left, center, and right three parallel weft threads are intertwined as a warp and weft strip, and at this time, the "left and right" of the warp and weft threads are intertwined in sync with each other, and the "center" of the warp and weft threads are intertwined with each other, and the intertwined parts form a woven fabric). 2 The base fabric has an area of ​​voids of 1 to 10 mm 2 It is preferable that the stress at 10% tension in the weft direction (based on JIS L1096A) is 90 to 110% of the stress at 10% tension in the warp direction (based on JIS L1096A), as this provides an excellent balance of dimensional stability in the warp and weft directions of the resulting mesh sheet. The base fabric may be a satin weave, but if the number of crossing yarns is large, it is prone to mesh misalignment in an open weave, making it difficult to achieve a range of 90 to 110%. The area of ​​the voids in the base fabric is 1 mm 2 If the gap area is smaller than 10mm, the air permeability will be poor. 2 If the gap exceeds 10mm, flying pests and other insects can easily invade the interior, and insect and foreign object control measures become insufficient. Rain droplets can also get in. 2In this range, raindrops form a water film on the inner wall of the gap, which is effective in preventing rainwater from entering the interior of applications such as sheet shutter devices, construction and demolition site enclosures (entrances and exits), facades, pergolas, furling shades, etc. For such sheet shutter devices, construction and demolition site enclosures (entrances and exits), facades, pergolas, furling shades, etc., a twill fabric with a void ratio of 18 to 30%, made by warp-and-warp entanglement of three strands of 750 (833 dtex) to 1000 denier (1111 dtex) yarn, and an area of ​​the gap of 1 to 5 mm is used. 2 These multifilament yarns include bulky processed yarns such as taslan yarns and wooly yarns, and covering yarns in which short fibers are wound around the outer periphery of the multifilament yarn bundles can also be used.

[0018] Area of ​​ventilation holes in the base fabric: 1 to 10 mm 2The gaps (which are roughly rectangular in shape) function not only as ventilation holes, but also as exhaust holes to relieve wind pressure in strong winds, and as windows to ensure visibility inside. The base fabric is, for example, a plain weave fabric (including basket weave) with a void ratio of 31% in which 250 (278 dtex) denier yarns are used as warp and weft threads and each thread is woven at a thread density of 26 per inch, a twill weave fabric with a void ratio of 28% in which 500 (555 dtex) denier yarns are used as warp and weft threads and each thread is woven at a thread density of 14 per inch, or a warp and weft threads with a 750 (832 dtex) denier yarns as one unit, Examples include a 32% porosity imitation woven fabric, each woven at a yarn density of 7 units per inch; a 20% porosity imitation woven fabric, each woven at a yarn density of 9 units per inch using warp and weft yarns, each consisting of three 500 (555 dtex) denier yarns; and a 32% porosity imitation woven fabric, each woven at a yarn density of 13 units per inch using warp and weft yarns, each consisting of three 250 (278 dtex) denier yarns. The most preferred number of threads per inch for warp and weft yarns is equal, as this provides excellent warp and weft dimensional balance, with a difference in the number of threads per inch of 1 or 2 threads being next most preferred. Under these conditions, the stress at 10% tension in the width direction of the mesh sheet (based on JIS L1096A) being 90 to 110% of the stress at 10% tension in the length direction (based on JIS L1096A), resulting in the most stable warp and weft dimensional balance. The void ratio, expressed as the total area ratio of voids per unit area of ​​the base fabric, is preferably 10 to 33%. A void ratio of less than 10% results in poor breathability and insufficient ventilation. Conversely, a void ratio of more than 33% facilitates the entry of flying pests, resulting in insufficient insect and foreign body control. In addition, a lack of solid areas to which stress is applied can impair dimensional stability in the warp and weft directions. The total void area is calculated by subtracting the total area of ​​the yarn bodies present in a unit area from the unit area. Specifically, a 1-inch square digital image can be imported into a computer, enlarged to an arbitrary magnification, and the area of ​​the yarn bodies and voids calculated as an image. Alternatively, the area may be calculated theoretically from the yarn width and yarn density design.These examples of yarn density and void ratio also apply to the yarn density and void ratio of coated yarns in which a continuous fiber spun bundle is passed through a molten flame-retardant resin liquid bath and the entire periphery is coated with a thermoplastic resin.

[0019] The mesh sheet of the present invention is a mesh sheet having a base fabric of either plain weave, twill or imitation weave, and a flame-retardant resin coating layer provided on the entire surface of the base fabric, with a porosity of 10 to 33% and a mass of 350 to 650 g / m 2The mesh sheet is a mesh sheet of the type described above. The flame-retardant resin coating layer contains at least a thermoplastic resin and a flame retardant. If necessary, known plastic additives such as plasticizers, heat stabilizers, light stabilizers, UV absorbers, antioxidants, antistatic agents, crosslinking agents, mildewproofing agents, antiviral agents, insect repellents, rodent repellents, deodorizers, lubricants, and colorants can be blended in any combination and amount. The flame-retardant resin coating layer is preferably formed on both sides of the base fabric by coating with a liquid flame-retardant resin composition and then heat-treating and drying, or by dipping the entire surface of the base fabric and then heat-treating and drying. Alternatively, a coated yarn may be obtained by spinning a multifilament yarn, passing it through a liquid bath containing a heat-molten flame-retardant resin composition, drawing it out through a nozzle with a specific diameter, and cooling and solidifying it. In the former case, since the thermoplastic resin must be in a liquid state, a soft vinyl chloride resin paste composition is most preferred, as it has low volatile components during processing, has excellent liquid viscosity stability, and contains halogen atoms in its molecular chain, resulting in excellent flame retardancy. Other thermoplastic resins that can be used include water-based resins such as ethylene-vinyl acetate copolymer resin emulsion compositions, (meth)acrylic ester copolymer resin emulsion compositions, crosslinkable acrylic resin emulsion compositions having (meth)acryloyl groups, urethane resin emulsion compositions (combined with an isocyanate compound), and ionomer resin (an ethylene-unsaturated carboxylic acid copolymer as a base, with metal ions such as Na, Ca, and Zn coordinated to the carboxylic acid groups) emulsion compositions. These may be used in combination with multiple grades of the same resin, or different resins. The latter is most preferred for flexible vinyl chloride resin compositions containing halogen atoms in the molecular chain and offering excellent flame retardancy. Other thermoplastic resins that can be used include ethylene-vinyl acetate copolymer resin compositions, acrylic resin compositions, polyethylene compositions, polypropylene compositions, polyurethane elastomer compositions, polystyrene elastomer compositions, polyester elastomer compositions, and fluorine-based elastomer compositions. These may be used in combination with multiple grades of the same resin, or different resins as compatible blends. As the flame retardant, fine particles of one or more known flame retardants such as antimony oxide, aluminum hydroxide, magnesium hydroxide, bromine compounds, and chlorine compounds can be used.When the amount of flame retardant particles used is the same, the smaller the particle size, the larger the surface area, resulting in improved flame retardancy. Therefore, flame retardancy can be achieved with less flame retardant. Furthermore, to increase the surface area, the flame retardant particles must be highly dispersible. To improve dispersibility in resins and emulsions, it is preferable for them to be surface-treated with fatty acid esters or other agents, making them less likely to aggregate. From a disaster prevention perspective, it is preferable for mesh sheets using this flame-retardant resin coating to comply with the 45° microburner or Meckel burner flame retardancy test (for tents and sheets) established by the Japan Fire Retardant Association.

[0020] In particular, the flame-retardant resin coating layer contains near-infrared reflective metal oxide, and in particular, has a heat-shielding coefficient pf of 40% or more, which allows the flame-retardant resin coating layer to efficiently reflect infrared rays and provide heat-shielding properties of about 1 to 3°C to sheet shutters, construction site safety enclosures, facade enclosures, pergolas, furring shades, etc., making it one way to prevent heatstroke in factories, construction sites, under pergolas, furring shades, etc. Near-infrared reflective metal oxides include: 1) white metal oxide particles such as titanium oxide (surface-treated with silica or alumina having an average particle size of 0.7 to 1.2 μm), zinc oxide, and antimony oxide; 2) red metal oxide particles such as zinc-iron-chromium composite oxide and zinc-iron-chromium-aluminum composite oxide; and 3) blue metal oxide particles such as cobalt-aluminum composite oxide, cobalt-aluminum-chromium composite oxide, cobalt-aluminum-magnesium composite oxide, cobalt-aluminum-zinc composite oxide, cobalt-tin composite oxide, cobalt-nickel-zinc composite oxide, cobalt-nickel-titanium-zinc composite oxide, cobalt-zinc-magnesium composite oxide, cobalt-zinc-chromium-titanium composite oxide, and cobalt-zinc-nickel-titanium composite oxide. 4) yellowish metal oxide particles such as bismuth-vanadium-aluminum composite oxide, nickel-barium-titanium composite oxide, nickel-titanium composite oxide, nickel-antimony-titanium composite oxide, chromium-antimony-titanium composite oxide, and lead-antimony-titanium composite oxide; and 5) blackish metal oxide particles such as iron-chromium composite oxide, iron-chromium-cobalt composite oxide, iron-chromium-cobalt-manganese composite oxide, copper-chromium composite oxide, copper-magnesium composite oxide, copper-chromium-manganese composite oxide, copper-bismuth composite oxide, and manganese-bismuth composite oxide. These can be combined in any combination depending on the application and color appearance of the mesh sheet. The content of the flame-retardant resin coating layer is approximately 2.5 to 20% by mass, and the higher the content, the greater the heat-shielding effect. In the case of soft polyvinyl chloride resin, the content is approximately 2.5 to 10% by mass. These particles are surface-treated with fatty acid esters or the like, making them less likely to agglomerate and providing excellent dispersibility and efficient heat-shielding effect.For hue adjustment, red pigments such as azo lake red, monoazo red, condensed azo red, quinacridone red, diketopyrrolopyrrole red, thioindigomagenta, perylene red, perinone red, anthraquinonyl red, and quinacridone violet, blue pigments such as phthalocyanine blue, anthraquinone blue, cobalt blue, ultramarine blue, dioxazine violet, quinacridone violet, indanthrene blue, indigo blue, perylene blue, and phthalocyanine green, yellow pigments such as monoazo yellow, disazo yellow, condensed azo yellow, nickel azo yellow, isoindoline yellow, isoindolinone yellow, naphthol yellow, quinophthalone yellow, and iron oxide, and black pigments such as carbon black, aniline black, carbon graphite, and titanium oxynitride can also be used in combination.

[0021] In particular, the flame-retardant resin coating layer contains an antistatic substance, and the surface resistivity (JIS K7194 compliant) is 10 9By providing a resistance of Ω / □ or less to prevent dust adhesion, static electricity buildup during winding and unwinding of sheet shutters can be suppressed, preventing the adhesion of dust and other foreign matter. It also improves the removal of dust that accumulates on the inner walls of ventilation gaps in sheet shutters, construction site safety enclosures, facade enclosures, pergolas, and retractable furling shades. Antistatic substances include surfactants, conductive plasticizers, ionic liquids, carbons, and π-electron conjugated polymers. Examples of surfactants include anionic (carboxylates, sulfates, sulfonates, phosphates), cationic (amine salts, quaternary ammonium), amphoteric (amino acid, betaine), and nonionic (polyethylene glycol, polyhydric alcohol), and are contained in an amount of 0.3 to 5% by mass relative to the mass of the flame-retardant resin coating layer. Examples of polymeric plasticizers include quaternary ammonium salt polymers such as polyvinylbenzyl, poly(meth)acrylate, styrene-(meth)acrylate, styrene-maleimide, and methacrylate-methacrylimide. The conductive plasticizer is a liquid phthalate compound, a liquid adipate compound, or a liquid sebacate compound having 2 to 4 alkyl chains with ether bonds, specifically, dicarboxylic acid alkyl cellosolve ester compounds such as diethyl phthalate cellosolve, dibutyl phthalate cellosolve, diethyl adipate cellosolve, dibutyl adipate cellosolve, diethyl azelate cellosolve, dibutyl azelate cellosolve, diethyl sebacate, and dibutyl sebacate, as well as adipic acid, phthalic acid, and the like. Examples of such plasticizers include reaction products of dicarboxylic acids with mono- and poly-alkylene glycol monoalkyl ethers, caprylic acid esters of triethylene glycol, octylic acid esters of tetraethylene glycol, diesters of polyethylene glycol and 2-ethylacetic acid, and diesters of polyester glycol and 2-ethylhexyl acid. These are mainly used as plasticizers for vinyl chloride resins in amounts of 30 to 80 parts by mass, and can also be used in combination with 30 to 75 parts by mass of a general-purpose plasticizer such as DOP, DINP, or DOA in amounts of 5 to 50 parts by mass, and can also be used in combination with a surfactant.Ionic liquids are formed by ion pairs of cations and anions, where the cations are imidazolium, imidazolinium, pyridinium, pyrazolium, pyrrolidinium, piperidinium, ammonium, phosphonium, sulfonium, etc., and the anion is BF4. - , PF6 - , TaF6 - , NbF6 - , SiF6 - , AlF4 - , AlCl4 - , NO2 - , NO3 - , F - , Cl - , Br - , I - , C.N. - , AsF6 - , SbF6 - , NbF6 - , TaF6 - , CF3SO2 - , (CF3SO2)2N - , p-CH3PhSO3 - , CH3CO2 - , CH3SO3 - , CF3SO3 - , (CF3SO2)3C - , C3F7CO2 - , C4F9SO3 - , (C2F5SO2)2N - , (CF3SO2)(CF3CO)N - , (CN)2N -, etc., and are contained in an amount of 0.3 to 5 mass% relative to the mass of the flame-retardant resin coating layer. The ionic liquid can also be used in combination with a surfactant, a conductive plasticizer, etc. Carbons include carbon nanotubes, fullerenes, graphene, graphite, carbon black, acetylene black, cut carbon fiber, etc., and are contained in an amount of 0.5 to 7.5 mass% relative to the mass of the flame-retardant resin coating layer. They can also be used in combination with a surfactant, a conductive plasticizer, an ionic liquid, an electronically conjugated conductive polymer, etc. Electronically conjugated conductive polymers include polypyrroles, polythiophenes, polyacetylenes, polyphenylenes, polyphenylene vinylenes, polyanilines, polyacenes, polythiophene vinylenes, and copolymers and derivative polymers thereof. These are preferably unevenly distributed on the surface of the flame-retardant resin coating layer, and this uneven distribution is achieved by a surface treatment to form an electronically conjugated conductive polymer thin film layer.

[0022] In particular, it is preferable that the flame-retardant resin coating layer contains a pyrethroid compound and has an insect repellent effect against flying pests with a KT50 knockdown time (the time required for 50% of the test insects to be suppressed and become unable to get up, regardless of whether they are dead or alive) of 30 minutes or less at room temperature. 2 Although flying pests cannot physically pass through the gaps, they may be attracted by the light and land in large numbers on the mesh sheet. In such cases, the presence of pyrethroid compounds knocks down and eliminates the flying pests, or has a repellent effect that acts as a shield to keep them away from the mesh sheet. The pyrethroid compound contained in the flame-retardant resin coating layer is Empenthrin (also known as Vaporthrin: C 18 H 26 O2: molecular weight 274.4 (chemical name: 1-ethynyl-2-methyl-2-pentenyl = 2,2-dimethyl-3-(2-methyl-1-propenyl)-1-cyclopropanecarboxylate), furametrin (also known as pynamin D:C) 18 H 22O3: molecular weight 286.4 (chemical name: 2,2-dimethyl-3-(2-methyl-1-propenyl)cyclopropanecarboxylic acid 5-propargylfuran-2-ylmethyl), prallethrin (also known as Ethoc: C 19 H 24 O3: molecular weight 300.4 (chemical name: (+)-2-methyl-4-oxo-3-(2-propynyl)(±)-2-cyclopentenyl(+)-cis / trans chrysanthemate), allethrin (also known as pynamine: C 19 H 26 O3: molecular weight 302.4 (chemical name: Dl-3-allyl-2-methylcyclopent-2-en-4-one-1-yl-DL-cis,trans chrysanthemate), imiprothrin (also known as Pral: C 17 H 22 N2O4: molecular weight 318.3 (chemical name: 2,5-dioxo-3-prop-2-ynyl imidazolidin-1-ylmethyl (1RS,3RS;1RS,3SR)-2,2-dimethyl-3-(2-methylprop-1-enyl)cyclopropanecarboxylate), pyrethrins (C 21 H 28 O3: molecular weight 328.4 (chemical name: mixture of pyrethrin I, II, cinerin I, II, and jasmolin I, II) and phthalthrin (also known as neopynamin: C 19 H 25 NO4: molecular weight 331.4 (chemical name: N-(3,4,5,6-tetrahydrophthalimido)methyl-D,L-cis,trans chrysanthemate), resmethrin (also known as Chryslon: C 22 H 26 O3: molecular weight 338.5 (chemical name: (5-benzyl-3-furyl)methyl d-cis, trans chrysanthemate), fenothrin (also known as sumithrin: C 23 H 26 O3: molecular weight 350.4 (chemical name: 3-phenoxybenzyl d-cis, trans chrysanthemate), metofluthrin (also known as Eminence: C 18 H 20 F4O3: molecular weight 360.3), cinerin II (C 21 H 26 O5: molecular weight 360.4), transfluthrin (also known as Biothrin: C 15 H12 Cl2F4O2: molecular weight 371.1 (chemical name: 2,3,5,6-tetrafluorobenzyl (1R,3S)-3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate), Jasmolin II (C 22 H 30 O5: molecular weight 374.5), cyphenothrin (also known as Gokirate: C 24 H 25 NO3: Molecular weight 375.5 (Chemical name: cyano(3-phenoxyphenyl)methyl 2,2-dimethyl-3-(2-methylprop-1-en-1-yl)cyclopropanecarboxylate), Peratorin (C 18 H 21 ClO4: molecular weight 375.5), etofenprox (C 25 H 28 O3: molecular weight 376.5 (chemical name: 2-(4-ethoxyphenyl)-2-methylpropyl 3-phenoxybenzyl ether), Momfluorotrin (C 19 H 19 F4O3: molecular weight 385.3), permethrin (also known as Exmin: C 21 H 20 Cl2O3: molecular weight 391.3 (chemical name: 3-phenoxybenzyl 3-(2,2-dichlorovinyl)-2,2-dimethylcyclopropanecarboxylate), silafluofen (C 25 H 29 FO2Si: molecular weight 408.6), tefluthrin (C 17 H 17 ClF7O2: molecular weight 418.7), bifenthrin (C 23 H 22 ClF3O2: molecular weight 422.9 (chemical name: 2-methyl-1,1'-biphenyl-3-ylmethyl (Z)-3-(2-chloro-3,3,3-trifluoro-1-propenyl)-2,2-dimethylcyclopropanecarboxylate), and cyfluthrin (also known as Baythroid: C 22 H 18Cl2FNO3: molecular weight 434.3 (chemical name: α-cyano(4-fluoro-3-phenoxy)benzyl 2-(2,2-dichlorovinyl)-3,3-dimethylcyclopropane-1-carboxylate) and one or more selected from the above, and it is particularly preferable to use two types in combination, with the difference in molecular weight between them being 40 to 160. Most of these pyrethroid compounds have a chrysanthemic acid structure in their molecular structure, which provides insect repellent effects (killing, repellent, knocking down).

[0023] When two pyrethroid compounds are used in combination, their combined mass ratio is 1:3 to 3:1, the molecular weight difference is 40 to 160, especially 60 to 140, and the ratio is 0.25 to 5.0 mass% relative to the flame-retardant resin coating layer. A lower amount fails to provide long-term insect control, while a higher amount leaves the mesh sheet surface sticky due to bleeding of the pyrethroid compound. By combining two compounds that meet these formulation requirements, insect control (killing, repellent, or knockdown) can be achieved with a time-delayed effect, ranging from immediate (fast onset) to persistent (long-lasting) efficacy. When two pyrethroid compounds are used in combination, the molecular weight difference is 40 to 160, and the mass ratio of the lower molecular weight pyrethroid compound to the higher molecular weight pyrethroid compound is 3:1 or close to this (approximately 3:1 to 5:3), resulting in a formulation that is primarily rapid-acting yet also has excellent persistent efficacy. On the other hand, if the mass ratio of the pyrethroid compound with the lower molecular weight to the pyrethroid compound with the higher molecular weight is 1:3 or close to this (approximately 1:3 to 3:5), the formulation will be primarily residually effective, yet also have excellent immediate action. If the molecular weight difference is less than 40, the difference between immediate and residual action may become unclear. The combined effect of these two pyrethroid compounds is particularly pronounced in flame-retardant resin coating layers containing 20 to 40 mass% of plasticizer (molecular weight 370 to 475). As synergists that enhance the effects of pyrethroid compounds, 5-[2-(2-butoxyethoxy)]-6-propyl 1,3-benzodioxole, N-(2-ethylhexyl)bicyclo[2.2.1]hept-5-ene-2,3-dicarboximide, N-(2-ethylhexyl)-1-isopropyl-4-methylbicyclo[2.2.2]oct-5-ene-2,3-dicarboximide, octachlorodipropyl ether, etc., are used in amounts 1 to 10 times the pyrethroid compound (total). These inhibitors act as microsomal complex oxidases that metabolize and decompose insecticides in the body, suppressing the decomposition of pyrethroid compounds in the insect's body. This has the effect of enhancing the efficacy of insecticides.

[0024] In particular, the flame-retardant resin coating layer contains rubber crosslinks throughout its entirety. This crosslinking imparts cold-flexibility to the flexible vinyl chloride resin composition, particularly when the flame-retardant resin coating layer is composed of a flexible vinyl chloride resin composition. The rubber crosslinks are a condensation product of a liquid synthetic rubber having either a -COOH group or an -OH group at the molecular end and a polyisocyanate compound, where the liquid synthetic rubber is at least one selected from butadiene-based, isoprene-based, and farnesene-based rubbers. This liquid synthetic rubber is compatible with the plasticizer contained in the flexible vinyl chloride resin composition and penetrates into the vinyl chloride resin particles together with the plasticizer. In this state, the flexible vinyl chloride resin composition is thermally gelled, and simultaneously the liquid synthetic rubber reacts with the polyisocyanate compound to form a hybrid rubber crosslink network entangled with the vinyl chloride resin main chain throughout the flame-retardant resin coating layer. This composite formation of rubber crosslinks enhances the flex resistance of the sheet shutter when it is wound and unwound, as well as cold-flexibility. It also enhances the smoothness of folding and storing pergolas, retractable furling shades, and other items, particularly in winter, and their cold-flexibility. The butadiene liquid rubber has a molecular weight (Mn) of 1,000 to 5,000 and a viscosity of 50 to 1,000 poise (25°C). It is a block copolymer containing 5 to 25% by mass of styrene and / or acrylonitrile, and a copolymer containing 10 to 50% by mass of isoprene or hydrogenated isoprene. When rubberized, it exhibits excellent rubber elasticity, particularly when it contains 75 to 80% of a 1,4-cis structure or a 1,4-trans structure and 20 to 25% of a 1,2-vinyl structure. The isoprene-based liquid rubber is a block copolymer containing 5 to 25% by mass of styrene and / or acrylonitrile, and a copolymer containing 10 to 50% by mass of butadiene or hydrogenated isoprene, with a molecular weight (Mn) of 3,000 to 25,000. Furthermore, the funnelthene-based liquid rubber is preferably a copolymer rubber of funnelthene and styrene, or a copolymer rubber of funnelthene and butadiene, with a molecular weight Mn of 3000 to 50000. The rubber crosslinking of these liquid synthetic rubbers can be formed by dehydration condensation of -COOH groups and -OH groups at (both) molecular terminals, but a rubber structure formed by reaction with a polyisocyanate compound is preferred.As a crosslinking aid, diamine, polyamine, diisocyanate, epoxyamine, aziridine, oxazoline, etc. can also be used in combination. Alternatively, diol, polyol, dicarboxylic acid, polycarboxylic acid, etc. can also be used in combination. Furthermore, as part of the rubber crosslinking, an organic-inorganic composite crosslinking containing silica can be used.

[0025] Polyisocyanate compounds include isocyanurate-modified triisocyanates, such as 1) trimer of tolylene diisocyanate (TDI), 2) trimer of 4,4-diphenylmethane diisocyanate (MDI), 3) trimer of xylylene diisocyanate (XDI), 4) trimer of tetramethyl xylylene diisocyanate (mTMXDI), 5) trimer of hexamethylene diisocyanate (HDI), 6) trimer of isophorone diisocyanate (IPDI), 7) trimer of hydrogenated xylylene diisocyanate (H6XDI), and biuret. Modified triisocyanates include 8) TDI trimer, 9) MDI trimer, 10) XDI trimer, 11) mTMXDI trimer, 12) HDI trimer, 13) IPDI trimer, and 14) H6XDI trimer. Trimethylol alkyl-modified triisocyanates include 15) TDI trimer, 16) MDI trimer, 17) XDI trimer, 18) mTMXDI trimer, 19) HDI trimer, 20) IPDI trimer, and 21) H6XDI trimer. These 21 types of trifunctional isocyanate compounds can be used alone or in any combination. It is particularly preferred to use one or more of the nine light-resistant, non-yellowing triisocyanates: HDI, IPDI, and H6XDI. These triisocyanate compounds are preferably used in the form of blocked isocyanate compounds to which a blocking agent has been temporarily added in order to control the reactivity of the isocyanate group.

[0026] The rubber crosslinking may be an organic-inorganic hybrid crosslinking in which silica particles are interposed as part of the rubber crosslinking. Silica is used in an amount of 1 to 25% by weight of the liquid synthetic rubber, and becomes part of the rubber crosslinking by forming chemical bonds between the silanol groups on the silica surface and the -COOH and -OH groups at (both) molecular terminals of the liquid synthetic rubber. Such crosslinking is formed by dehydration condensation between the -COOH and -OH groups at (both) molecular terminals of the liquid synthetic rubber and the silanol groups on the silica surface, and simultaneously by bonding the functional groups of the liquid synthetic rubber with the silanol groups of the silica particles using a polyisocyanate compound (paragraph

[0025] ). Crosslinking aids such as diamines, polyamines, diisocyanates, epoxyamines, aziridines, and oxazolines can also be used in combination. Diols, polyols, dicarboxylic acids, and polycarboxylic acids can also be used in combination. This rubber crosslinking is generated simultaneously with the gelling heat treatment of the soft vinyl chloride resin paste that forms the flame-retardant resin coating layer, resulting in the composite formation of uniform rubber crosslinks throughout the entire flame-retardant resin coating layer. This composite formation of rubber crosslinks strengthens the entire flame-retardant resin coating layer, making it suitable for use in lift-up sheet shutter devices, pergolas (openable shade shelves), openable furling shades, and other devices that require bending resistance (especially in cold climates). The inclusion of a silane coupling agent in the soft vinyl chloride resin paste composition further reinforces the chemical bond between the liquid synthetic rubber and silica. The silica has a BET specific surface area of ​​100 to 300 m. 2 / g, or synthetic amorphous silica with a secondary particle diameter of 1 to 40 μm. The surface of the silica has silanol (Si-OH groups), and the silanol groups react with -COOH groups, -OH groups at the molecular terminals (both terminals) of the liquid synthetic rubber, polyisocyanate compounds (paragraph

[0025] ), etc., and the silica particles become part of the rubber component.

[0027] In paragraphs

[0024] to

[0026] , the vinyl chloride resin used in the flexible vinyl chloride resin composition is a paste vinyl chloride resin (emulsion polymerization type) with a number-average molecular weight of 1000 to 2500, and the external gloss can be controlled to a matte finish by blending in a straight vinyl chloride resin (suspension polymerization type) with a number-average molecular weight of 1000 to 3500 as needed. The plasticizer is one or more selected from adipic acid ester compounds, phthalate ester compounds, cyclohexane dicarboxylic acid ester compounds, cyclohexene dicarboxylic acid ester compounds, phosphate ester compounds, chlorinated paraffin compounds, polyester compounds, and biomass plasticizers synthesized from plant-derived compounds (same chemical structure as the plasticizers but containing a radioactive carbon atom C14), and the total amount is 40 to 100 parts by mass per 100 parts by mass of the paste vinyl chloride resin. The stabilizer is one or more selected from barium-zinc complexes, calcium-zinc complexes, epoxidized soybean oil, etc., and is present in a total amount of 2 to 10 parts by mass per 100 parts by mass of the paste vinyl chloride resin. The flame retardant is one or more selected from antimony trioxide, antimony pentoxide, aluminum hydroxide, magnesium hydroxide, zinc borate, etc., and is present in a total amount of 10 to 30 parts by mass per 100 parts by mass of the paste vinyl chloride resin. The filler is one or more selected from calcium carbonate, barium sulfate, silica, talc, etc., and is present in a total amount of 10 to 50 parts by mass per 100 parts by mass of the paste vinyl chloride resin. The light resistance stabilizer is one or more selected from benzophenone tautomers, benzotriazole tautomers, triazine tautomers, hindered amine compounds, etc., and is present in a total amount of 1 to 3 parts by mass per 100 parts by mass of the paste vinyl chloride resin. The crosslinking agent is one or more selected from polyisocyanate compounds, silane coupling agents, etc., and is used in a total amount of 1 to 10 parts by mass per 100 parts by mass of the vinyl chloride resin paste. The antifungal agent is one or more selected from imidazole compounds, thiazole compounds, isothiazolinone compounds, pyridine compounds, N-haloalkylthio compounds, phenoxyarsine compounds, etc., and is used in a total amount of 0.1 to 3 parts by mass per 100 parts by mass of the vinyl chloride resin paste.The pigment is one or more selected from titanium oxide, carbon black, inorganic compounds, azo compounds, phthalocyanine compounds, anthraquinone compounds, quinacridone compounds, etc., and the total amount of the pigment is 0.01 to 10 parts by mass per 100 parts by mass of the paste vinyl chloride resin.

[0028] The mesh sheet of the present invention is produced by unwinding a long base fabric roll (1-3 m wide) and feeding it into the entrance of a dipping or coating machine. The entire surface of the base fabric is continuously coated with the flame-retardant resin coating composition described above by dipping or coating. The resulting mesh sheet is then passed through a heat treatment drying oven and continuously wound up at the exit. The flame-retardant resin coating can be formed by penetrating the inter-filament gaps of the multifilament yarn constituting the base fabric, impregnating the entire multifilament yarn, or by leaving the core of the yarn unimpregnated. During this processing sequence, the base fabric, intermediate product, and mesh sheet all flow through the machine at the same processing speed. Because the mesh sheet is wound under tension in the processing direction, all aspects of the base fabric, intermediate product, and mesh sheet elongate in the longitudinal direction and, conversely, lose width in the transverse direction, resulting in warp (processing direction) and weft (width direction) imbalance distortion. This weft / warp imbalance distortion persists in the mesh sheet as it is produced. Therefore, the resulting mesh sheet tends to stretch in the width direction to compensate for the width loss and shrink in the length direction to compensate for the expansion. In particular, in open-close sheet shutters with wide openings, the processing direction of the mesh sheet is used as the width direction of the opening. When tension (tension) is applied in the width direction of the sheet material during vertical movement, the sheet gradually expands to compensate for the width loss, causing the mesh sheet to sag and tend to hang in the width direction. To avoid this problem, it is effective to apply a tension in the width direction equivalent to the processing direction tension, at least for intermediate products and later. It is particularly preferable that the stress of the resulting mesh sheet at 10% tension in the width direction (according to JIS L1096A) be 90 to 110% of the stress at 10% tension in the longitudinal direction (according to JIS L1096A). Outside this range, the mesh sheet may sag and hang in the width direction. The tension in the width direction can be applied by pinning or clipping the left and right ends (edges) of the base fabric, intermediate product, and mesh sheet to prevent them from shrinking below their original width, or by expanding them beyond their original width.

[0029] The mesh sheet has a porosity of 10 to 33% and a mass of 350 to 650 g / m 2 In applications such as sheet materials for sheet shutters, entrances and exits of safety enclosures at construction sites for building construction, renovation and demolition, facade enclosures, pergolas (opening and closing ceiling accordion or opening and closing slat shade shelves), and furling shades (opening and closing swivel roll-up shades), the 45° microburner method (product mass 450 g / m) of the fire retardancy test (for tents and sheets) specified by the Japan Fire Retardant Association, a public interest incorporated foundation, is used. 2 or less), or Meckel burner method (product mass 450g / m 2 In terms of disaster prevention, it is preferable that the mesh sheet meets the safety certification of mechanical properties stipulated by the Temporary Construction Industry Association, especially for safety enclosures at construction sites and entrances / exits. In these applications, the mesh sheet should have a wind pressure resistance of 9 to 12 kg / m at a wind speed of 10 m / s. 2 It is preferable that the air permeability is 350 to 650 g / m 2 In the mesh sheet, the area of ​​the voids is 1 to 10 mm 2 This can be ensured by satisfying a void ratio of 10 to 33%. For example, if the area of ​​the void is 1 mm 2 , when the porosity is 18%, the wind pressure resistance is 11 kg / m 2 (wind speed 10 m / s) breathability, void area 1 mm 2 , when the porosity is 10%, the wind pressure resistance is 11.7 kg / m 2 (wind speed 10 m / s) breathability, void area 4 mm 2 , when the porosity is 30%, the wind pressure resistance is 9.8 kg / m 2 (wind speed 10 m / s). For comparison of breathability, when the porosity is 0%, the wind pressure resistance is 12.5 kg / m 2 (wind speed 10 m / s), and above this value the breathability is essentially zero, 12.5 kg / m 2 The smaller the wind speed is (10 m / s), the greater the breathability is considered to be.

[0030] Lift-opening sheet shutters can accommodate openings ranging from 1m to 10m wide and 2m to 6m high. For example, for an opening with a 6m wide and 3.6m high, four pieces of mesh sheet, each 1m wide and 6m long, are used, with the length adjusted to the opening width and the height adjusted to the width of the opening. The four pieces are then joined with a 2.5-5cm lap joint to accommodate the opening size. The lap joints are created by overlapping the original fabric by 2.5-5cm, increasing thickness and creating a beam that is robust against bending. In the example above, three horizontal beams are attached. These evenly spaced horizontal beams reduce the risk of wrinkles when the sheet shutter automatically opens and closes using a motion sensor, automatically rewinding at an electric speed (open 0.5-3m / s, close 0.5-1m / s), and are an essential measure for ensuring stable, repeated raising and lowering. In the above example, the entire surface of the sheet shutter with a width of 6 m and a height of 3.6 m is designed to be ventilated. The second and third rows from the top are made of mesh sheets, and the first and fourth rows from the top are made of regular shutter sheets (for example, "Tomei Tarpo (trademark) ET-1600H" manufactured by Hiraoka Ori Sen Co., Ltd., weight 900 g / m 2 : An impermeable, highly visible tarpaulin made by laminating transparent PVC film on both sides of a white PVC-coated mesh (4mm x 4mm gap) can be used, with only the second and third layers being ventilated. Other variations include arranging the mesh sheets in the following order: 1st layer, 2nd layer, 3rd layer, 4th layer, 1-2th layer, 1-3th layer, 1-4th layer, 2-4th layer, 3-4th layer, 1-2-3th layer, 1-2-4th layer, 1-3-4th layer, 2-3-4th layer, etc. Also, for soundproofing enclosures at construction sites such as building construction, renovation, and demolition, a woven fabric core with thermoplastic resin sheets laminated on both sides is used, with a mass of 800 to 1300 g / m. 2When soundproofing sheets (for example, the "Sound Shutter (trademark) series, 190cm wide" manufactured by Hiraoka Ori-sen Co., Ltd.) are used, and for example, a single piece of 180cm wide x 340cm long grommets is expanded vertically and horizontally by connecting the grommets, the inside of the enclosure becomes an environment that is isolated from the outside world, and the closer it is to the ground, the worse the ventilation becomes, and in addition to dust, hot air and the smell of chemicals (paint, resin building materials, etc.) become trapped. Therefore, by replacing some of these soundproofing sheets (at least two places, such as entrances and exits) with mesh sheets, it becomes possible to lower the ambient temperature of the site in the summer and to ventilate effectively. Also, a pergola is a square or rectangular sunshade shelf with a ceiling that is 3m to 10m on a side and has an open-close mesh sheet on the ceiling of an open frame (beam structure). The mesh sheet on the ceiling is opened and closed manually or electrically with bellows or slats, and by adding this sunshade shelf, it becomes possible to create an environment with a side of 25m to 30m. It can be used to build large pergolas. A furling shade is an open structure suitable for homes and public spaces, consisting of a 3- to 15-meter-per-side mesh (triangular or rectangular) on the ceiling, three or four support posts (two of the support posts can be replaced with two on the wall), and a swivel mechanism. The swivel mechanism's rope shaft is manually or electrically retracted and retracted, and by pulling and unwinding, the mesh is suspended and deployed from the top of the support post. By installing such furling shades, large, stylish shaded spaces can be created. The use of mesh sheets in these structures solves the problem of poor dimensional balance over time in the warp and weft directions (i.e., length and width) due to manufacturing factors, as with lift-open sheet shutters, which can lead to sagging. This problem is less likely to occur even with repeated opening and closing.

[0031] The mesh sheet of the present invention may also be provided with an anti-fouling layer, which may be formed on one or the entire surface of the flame-retardant resin coating layer. When the flame-retardant resin coating layer contains an antistatic substance, a pyrethroid compound, or the like, it is preferable to form the anti-fouling layer on only one surface. Examples of the anti-fouling layer include acrylic resins, fluorine-based copolymer resins, acrylic-silicone copolymer resins, acrylic-fluorine copolymer resins, acrylic-urethane copolymer resins, blends of acrylic resins and fluorine-based copolymer resins, and transparent layers containing these resins and silica particles, colloidal silica, organosilicates, silane coupling agents, UV absorbers (benzophenone tautomers, benzotriazole tautomers, triazine tautomers, etc.). These anti-fouling layers can be formed by coating both sides of the mesh sheet with the coating material by gravure coating or the like and drying to form a coating film, or by coating the entire surface of the mesh sheet with the coating material by dipping or the like and drying to form a coating film.

[0032] The present invention will now be described in more detail with reference to examples and comparative examples, but the present invention is not limited to the scope of these examples. The test methods used in the examples and comparative examples of the present invention are as follows. (1) Stress at 10% tension (JIS L1096A method) (2) Heat insulation (heat insulation rate%) An infrared lamp simulating sunlight was used, and the rate at which the sheet piece blocked radiant heat was measured as the heat blocking rate of the sheet according to the following test method. <Test environment> An infrared lamp (100V, 125W, i-R type: Iwasaki Electric Co., Ltd.) was attached to the center of the ceiling of a box-shaped structure with an inner diameter of 60cm high x 70cm wide x 70cm long, which had the ability to block outside air and was airtight, and a base (8cm high) with a heat flow meter (Shothrm HFM heat flow meter: Showa Denko K.K.) sensor attached was constructed in the center of the bottom of the test box. The distance from the ceiling to the tip of the infrared lamp was 22cm, and the distance from the tip of the infrared lamp to the sensor was 30cm. The lamp was turned on in an environment 60cm high inside the box-shaped structure, and the heat flow (kcal / m 2 h) every minute, and the heat flow rate qn (kcal / m2 After the temperature inside the box structure was returned to 20°C, a test sheet (10cm long x 10cm wide) was placed on the base to which the sensor was attached, and a 3.5mm thick transparent glass plate was placed on top of it. The lamp was then turned on, and the heat flow rate (kcal / m 2 h) every minute, and the heat flow rate qc (kcal / m 2 h) was measured, and the heat shielding coefficient pf (%) was calculated according to formula (1). Heat shielding rate pf (%) = [(qn-qc) / qn] × 100 (1) The higher the heat shielding rate pf (%), the higher the heat shielding effect. (3) Antistatic Surface resistivity (JIS K7194 compliant) After leaving the film material piece at 23°C and a relative humidity of 50%RH for 24 hours, the surface resistivity was measured three times using the resistivity meter described below (JIS K7194 compliant), and the average value was taken as the surface resistivity. The surface resistivity is affected by the amount of antistatic substance added, and the greater the amount added, the higher the antistatic properties. A) High resistance / resistivity meter Mitsubishi Chemical Analytech "Hi-Resta UP MCP-HT800 (Range 10 3 ~10 14 Ω) B) Low resistance / resistivity meter Mitsubishi Chemical Analytech "Loresta GX MCP-T700 (Range 10 -4 ~10 7 Ω)」 (4) Repellent effect against flying pests (KT50) A 6cm x 6cm square piece of partition sheet was placed in a glass petri dish 8.5cm in diameter and 2.5cm high, and left to acclimate to an environment of 25°C for 30 minutes with the lid on. Ten adult chironomids (midges) were released into the dish, and from this point onwards the number of midges knocked down was counted. The time (seconds) until the fifth midge was knocked down (half the number) was calculated as the "KT50 value", and the smaller this value (average of three tests) the higher the insect repellent effect was judged to be. *KT50 = Median knockdown time (the time required for 50% of test insects to become depressed (unable to stand up regardless of whether they are dead or alive)) (5) Dematcha cold bending fatigue endurance test (JIS K6301 compliant) A 50mm wide x 150mm long sample was taken from the mesh sheet and left to rest in a -10°C environment for 24 hours, after which it was folded in half, top and bottom, from the centre 25mm of the width, to form a 25mm wide x 150mm long folded test piece. This was then attached to a YSS Dematcha Flexing Tester (manufactured by Yasuda Seiki Seisakusho) and subjected to 100 cycles of repeated folding and unfolding of the mesh sheet in cold conditions in a constant temperature room at -10°C. The surface condition of the test piece was observed and the dynamic cold resistance was judged as follows: 1: No abnormalities are observed 2: Minor cracks observed in the flame-retardant resin coating layer 3: Large cracks were observed in the flame-retardant resin coating layer.

[0033] Example 1 <Base fabric (1) ~ Mesh sheet (1)> 1) Polyester (polyethylene terephthalate) fiber 1000 (1111 dtex) denier multifilament yarn (twist count 250 times / m) was used as warp and weft yarns, with 14 yarns woven per inch, for a mass of 126 g / m 2 A plain weave fabric with a void ratio of 32% was used as the base fabric (1). 2) Vinyl chloride resin composition for forming a flame-retardant resin coating layer A paste composition (formulation 1) was prepared. 3) Vinyl chloride resin composition: A base fabric (1) was immersed (dipped) in a liquid bath of the paste composition <Mixture 1>, and the paste composition of <Mixture 1> was impregnated into the base fabric (1) at normal pressure. After that, the base fabric (1) was pulled out of the liquid bath and simultaneously squeezed with a rubber mangle roll to remove excess paste composition, thereby forming an uncured flame-retardant resin coating layer. 4) Next, the film is subjected to a gelling heat treatment in an electric hot air oven at 180°C for 3 minutes (tension in the processing direction: 2 kgf / 10 cm x tension in the width direction: 2 kgf / 10 cm) to form a flame-retardant resin coating layer of 314 g / m2 made of soft vinyl chloride resin. 2 is formed on the entire base fabric (1), with a mass of 440 g / m 2, porosity 30% (having 196 voids in an area of ​​1 inch x 1 inch, the area of ​​the voids is approximately 1 mm 2 ), a pastel green mesh sheet (1) was obtained. The mesh sheet (1) obtained had a wind pressure resistance of 10.2 kg / m at a wind speed of 10 m / s. 2 Air permeability (void ratio 0%): Wind pressure resistance of 12.5 kg / m at a wind speed of 10 m / s 2 The stress when the mesh sheet (1) is tensile at 10% in the width direction (based on JIS L1096A method) is 98% of the stress when the mesh sheet (1) is tensile at 10% in the length direction (based on JIS L1096A method), which means that the mesh sheet has an excellent balance of dimensions in the warp and weft directions, a heat insulation coefficient pf of 56.3%, and flame retardancy that complies with the 45° microburner method of flame retardancy tests (for tents, sheets). <Formulation 1> Vinyl chloride resin composition paste composition for forming a flame-retardant resin coating layer Paste: vinyl chloride resin (degree of polymerization 1700) 100 parts by mass Diisononyl phthalate (DINP plasticizer) 60 parts by mass Chlorinated paraffin (flame retardant and plasticizer) 5 parts by mass Epoxidized soybean oil (stabilizer and plasticizer) 4 parts by mass Antimony trioxide (flame retardant) 20 parts by mass Zinc stearate (stabilizer: 2 parts by weight) UV absorber (triazine tautomer) 0.5 parts by mass Surface-treated titanium oxide (near-infrared reflective metal oxide) 10 parts by mass * Surface treatment with aluminum oxide (outermost layer stearic acid treatment) Heat-shielding titanium with an average primary particle size of 1 μm Cobalt-aluminum-chromium composite oxide (near-infrared reflective metal oxide) 6 parts by mass Trichloroethylene (dilution solvent) 20 parts by mass

[0034] Example 2 <Base fabric (2) ~ Mesh sheet (2)> Polyester (polyethylene terephthalate) fiber 1000 (1111 dtex) denier multifilament yarn (twist count 250 times / m) was used for the warp and weft, with 14 yarns woven per inch for a mass of 126 g / m 2 A twill fabric with a void ratio of 32% was used as the base fabric (2). In addition, the same procedure as in Example 1 was repeated except that 6 parts by mass of cobalt-aluminum-chromium composite oxide (near-infrared reflective metal oxide) in [Composition 1] of Example 1 was omitted and replaced with 6 parts by mass of copper-chromium-manganese composite oxide (near-infrared reflective metal oxide) [Composition 2] was used. 2 is formed on the entire base fabric (2), with a mass of 446 g / m 2 , porosity 26% (having 196 voids in a 1 inch x 1 inch area, with a void area of ​​approximately 1 mm 2 ), a gray mesh sheet (2) was obtained. The mesh sheet (2) obtained had a wind pressure resistance of 10.6 kg / m at a wind speed of 10 m / s. 2 Air permeability (void ratio 0%): Wind pressure resistance of 12.5 kg / m at a wind speed of 10 m / s 2 The stress when the mesh sheet (2) is tensile at 10% in the width direction (based on JIS L1096A method) is 99% of the stress when the mesh sheet (2) is tensile at 10% in the length direction (based on JIS L1096A method), which means that it has an excellent balance of dimensions in the warp and weft directions, a heat insulation coefficient pf of 54.6%, and flame retardancy that complies with the 45° microburner method of flame retardancy tests (for tents, sheets).

[0035] Example 3 <Base fabric (3) ~ Mesh sheet (3)> Three 500 (555 dtex) denier multifilament yarns (twist count 250 times / m) made of polyester (polyethylene terephthalate) fiber were used as warp and weft yarns, with seven units woven per inch, for a total weight of 108 g / m 2 A damask fabric with a void ratio of 32% was used as the base fabric (3). In addition, a flame-retardant resin coating layer of 292 g / m2 was prepared in the same manner as in Example 1, except that 10 parts by mass of surface-treated titanium oxide (near-infrared reflective metal oxide) and 6 parts by mass of cobalt-aluminum-chromium composite oxide (near-infrared reflective metal oxide) in [Composition 1] of Example 1 were omitted and replaced with 14 parts by mass of copper-chromium-manganese composite oxide (near-infrared reflective metal oxide) and 2 parts by mass of carbon black [Composition 3]. 2 is formed on the entire base fabric (3), with a mass of 400 g / m 2 , porosity 30% (having 49 voids in an area of ​​1 inch x 1 inch, the area of ​​the voids is approximately 4 mm 2 ), a black mesh sheet (3) was obtained. The mesh sheet (3) obtained had a wind pressure resistance of 9.6 kg / m at a wind speed of 10 m / s. 2 Air permeability (void ratio 0%): Wind pressure resistance of 12.5 kg / m at a wind speed of 10 m / s 2 The mesh sheet (3) has an excellent balance of dimensions in both directions, with a heat shielding coefficient pf of 53.5% and flame resistance conforming to the 45° microburner method for flame resistance tests (for tents and sheets). The use of black mesh sheet (3) for sheet shutters improves visibility inside, and has been recognized as an effective measure to prevent head-on collisions.

[0036] Example 4 <Base fabric (3) ~ Mesh sheet (4)> The same as in Example 3 except that [Mixture 3] in Example 3 was changed to [Mixture 4], and the mass was 400 g / m 2 , porosity 30% (having 49 voids in an area of ​​1 inch x 1 inch, the area of ​​the voids is approximately 4 mm 2 ), a black mesh sheet (4) was obtained. The obtained mesh sheet (4) had the same specifications as the mesh sheet (3) (breathability, visibility, longitudinal dimensional balance, heat insulation, and flame resistance), and further had a surface resistivity of 4×10 6The anti-static properties of the mesh sheet (3) provide an added dust adhesion prevention effect, which prevents static electricity from building up when the sheet is wound up and unwound when the sheet shutter is opened and closed, preventing foreign matter such as dust and dirt from adhering (entering the facility), and also improving the removal of dust that accumulates on the inner walls of gaps during ventilation. This effect is due to the surface resistivity of the mesh sheet (3) of Ω7.4 x 10 10 The advantages are clear when compared to / □. <Formulation 4> Vinyl chloride resin composition paste composition for forming flame-retardant resin coating layer Paste: vinyl chloride resin (degree of polymerization 1700) 100 parts by mass Diisononyl phthalate (DINP plasticizer) 30 parts by mass By the reaction of n-octanol with ethylene oxide and adipic acid Adipic acid diester (conductive plasticizer with two ether bonds) 30 parts by mass 1-Ethyl-3-methylimidazolium / bis(trifluoromethanesulfonyl)imidazolium Do(〔CF3SO2〕2N - ) (ionic liquid compound) 3 parts by mass Chlorinated paraffin (flame retardant and plasticizer) 5 parts by mass Epoxidized soybean oil (stabilizer and plasticizer) 4 parts by mass Antimony trioxide (flame retardant) 20 parts by mass Zinc stearate (stabilizer) 2 parts by mass UV absorber (triazine tautomer) 0.5 parts by mass Copper-chromium-manganese composite oxide (near-infrared reflective metal oxide) 14 parts by mass Conductive carbon black 2 parts by mass Trichloroethylene (dilution solvent) 20 parts by mass

[0037] Example 5 <Base fabric (3) ~ Mesh sheet (5)> The same as in Example 3 except that [Mixture 3] in Example 3 was changed to [Mixture 5], and the mass was 400 g / m 2 30% porosity (49 voids in a 1 inch x 1 inch area, each void having an area of ​​approximately 4 mm 2), and a black mesh sheet (5) was obtained. [Mixture 5] is obtained by adding 5 parts by mass of permethrin (pyrethroid compound: Mw 391.3) to [Mixture 3]. The obtained mesh sheet (5) has the same specifications as mesh sheet (3) (breathability, visibility, longitudinal dimensional balance, heat insulation, flame resistance), and furthermore, the knockdown result of flying pests (mosquitoes) with a KT50 time of 13 minutes confirmed its insect repellent effect (repellent effect). The mesh sheet has an area of ​​voids of 1 to 10 mm 2 This means that flying pests (mosquitoes) cannot physically pass through the gaps, but when flying pests (mosquitoes) are attracted to the light and land in large numbers on the mesh sheet, the permethrin (pyrethroid compound) is expected to knock down the flying pests (mosquitoes) and eliminate them, or to have a shielding effect that keeps them away from the mesh sheet due to its repellent effect. This effect is clearly superior when compared to the KT50 time of mesh sheet (3) (no knockdown).

[0038] Example 6 <Base fabric (3) ~ Mesh sheet (6)> The same as in Example 3 except that [Mixture 3] in Example 3 was changed to [Mixture 6], and the mass was 400 g / m 2 , porosity 30% (having 49 voids in an area of ​​1 inch x 1 inch, the area of ​​the voids is approximately 4 mm 2), resulting in a black mesh sheet (6). [Mixture 6] was prepared by adding 10 parts by mass of a butadiene-based liquid rubber with an average molecular weight of 3,000 and -COOH groups at both molecular ends (15% by mass of styrene as a block copolymer component) and 2 parts by mass of an isocyanurate trimer of hexamethylene diisocyanate (HDI) (NCO crosslinker) to [Mixture 3]. The resulting mesh sheet (6) had the same specifications as mesh sheet (3) (breathability, visibility, longitudinal dimensional balance, heat insulation, and flame resistance). Furthermore, due to the formation of a rubber crosslinked composite through an addition reaction between the butadiene-based liquid rubber and the NCO crosslinker, it was evaluated as "1. No abnormalities" in a simulated test of 100 cycles of repeated folding and unfolding at -10°C. Therefore, mesh sheet (6) is expected to improve the bending resistance of the sheet when it is wound and unwound during the opening and closing of a sheet shutter, as well as its cold bending resistance. Furthermore, in pergolas, swivel-opening furling shades, etc., it is expected to be easier to fold and store, especially in winter, and to have better cold-resistant flexibility in cold weather. This effect is clearly superior to that of mesh sheet (3), "2. Minor cracks were observed in the flame-retardant resin coating layer."

[0039] Example 7 <Base fabric (3) ~ Mesh sheet (7)> The same as in Example 4 except that [Mixture 4] in Example 4 was changed to [Mixture 7], and the mass was 400 g / m 2 , porosity 30% (having 49 voids in an area of ​​1 inch x 1 inch, the area of ​​the voids is approximately 4 mm 2), a black mesh sheet (7) was obtained. [Blend 7] was prepared by adding 5 parts by mass of permethrin (a pyrethroid compound: Mw 391.3) to [Blend 4], 10 parts by mass of a butadiene-based liquid rubber containing 15% by mass of styrene as a block copolymer component and having -COOH groups at both molecular terminals and an average molecular weight of 3,000, and 2 parts by mass of an isocyanurate trimer (NCO crosslinker) of hexamethylene diisocyanate (HDI). Mesh sheet (7) had the same specifications (breathability, visibility, longitudinal dimensional balance, heat insulation, flame resistance, and antistatic properties) as mesh sheet (4), and further demonstrated the same insect repellent effect (repellent effect) as mesh sheet (5) of Example 5 and the same cold bending resistance as mesh sheet (6) of Example 6.

[0040] [Example 8] <Base fabric (4) ~ Mesh sheet (8)> Three 500 (555 dtex) denier multifilament yarns (twist count: 250 turns / m) made of polyester (polyethylene terephthalate) fiber obtained by polycondensation of terephthalic acid (containing radioactive carbon atom C14) and ethylene glycol (containing radioactive carbon atom C14) were used as warp and weft yarns, with seven units woven per inch for a total weight of 108 g / m. 2 The fabric used was a damask fabric with a void ratio of 32%. The rest of the fabric was the same as in Example 3, with a mass of 400 g / m 2 , porosity 30% (having 49 voids in an area of ​​1 inch x 1 inch, the area of ​​the voids is approximately 4 mm 2 ), a black mesh sheet (8) was obtained. The performance of this mesh sheet (8) is equivalent to that of the mesh sheet (3). Terephthalic acid contains the radioactive carbon atom C14 and is derived from plants, for example, by dehydrating isobutanol produced by fermenting corn sugar to form isobutylene, which is then dimerized and cyclized by a radical reaction to form orthoxylene, which is then converted into terephthalic acid. Similarly, ethylene glycol contains the radioactive carbon atom C14 and is derived from plants, for example, by dehydrating bioethanol produced by fermenting sugarcane molasses to form ethylene, which is then oxidized to ethylene oxide, which is then further hydrolyzed.

[0041] Example 9 The fluororesin paint of [Blend 8] below was applied to one side of the mesh sheet (4) of Example 4 using a 100-mesh gravure roll, and then heated and dried in a hot air oven at 120°C for 2 minutes to harden the fluororesin paint of [Blend 8] to form an antifouling layer (4 g / m 2 ) and weighs 404g / m 2 A mesh sheet (9) with an antifouling layer and a porosity of 30% was obtained. The obtained mesh sheet (9) was used for one year in a sheet shutter device at a factory entrance and exit, and when soot and dust accumulated on the surface and in the gaps was washed with water using a brush, it had such an antifouling effect that it was able to be washed back to an appearance close to that of the first time it was used, and it was superior to mesh sheet (3) in retaining its original appearance. This is thought to be due to the antistatic effect of mesh sheet (4), which reduces the accumulation of soot and dust, and the soot-releasing effect of the antifouling layer. [Formulation 8] Fluorine-based resin paint (for forming anti-fouling layer) Hydroxyl group-containing fluoroolefin vinyl ether copolymer (fluorine-based resin) 100 parts by mass Hexamethylene diisocyanate isocyanurate trimer (isocyanate) 10 parts by mass Colloidal silica (antistatic) 8 parts by weight Triazine tautomer (ultraviolet absorber) 5 parts by mass Curing catalyst: Dibutyltin dilaurate (approximately 10 ppm for fluororesin) Toluene / butyl acetate (diluent with a mass ratio of 1:1) 400 parts by mass

[0042] The lift-open / close type sheet shutter can be made of the same sheet selected from mesh sheets (1) to (9), or can be freely combined, but is not limited to these options. For example, four pieces of mesh sheet are used, and the length is tailored to the width of the opening, and the height of the opening is tailored to the width of the original fabric, and the four pieces of original fabric are joined with a 5cm lap joint to accommodate the size. The lap joint is where the original fabric is overlapped by a 5cm width, increasing the thickness and creating a beam that is strong against bending. Pieces 1 to 3 of these can be made of ordinary shutter sheet (for example, "Tomei Tarpo (trademark) ET-1600H" manufactured by Hiraoka Ori-sen Co., Ltd., mass 900g / m 2 : It may be a configuration that combines a white PVC coated mesh (4mm x 4mm gap) with a transparent PVC film laminated on both sides (impermeable, visible tarpaulin).

[0043] [Comparative Example 1] <Base fabric (5) ~ Mesh sheet (10)> 1) Polyester (polyethylene terephthalate) fiber 1000 (1111 dtex) denier multifilament yarn (twist count 250 times / m) was used as warp and weft yarns, with 14 yarns woven per inch, for a mass of 126 g / m 2 A four-strand interlaced satin fabric with a void ratio of 32% was used as the base fabric (5). 2) Using the same <Composition 1> as in Example 1, a mass of 440 g / m 2 , porosity 30% (having 196 voids in an area of ​​1 inch x 1 inch, the area of ​​the voids is approximately 1 mm 2 ), a pastel green mesh sheet (10) was obtained. The breathability, heat shielding rate, and flame resistance of the obtained mesh sheet (10) were equivalent to those of the mesh sheet (1), but the stress at 10% tension in the width direction (based on JIS L1096A) was 83% of the stress at 10% tension in the longitudinal direction (based on JIS L1096A), meaning that it was potentially prone to stretching in the width direction and had poor dimensional balance in the warp and weft directions. Therefore, when installed in a sheet shutter device, the repeated tension load during lifting and lowering caused relaxation (sagging) in the width direction, making it unsuitable for use in a sheet shutter device.

[0044] Comparative Example 2 <Base fabric (1) ~ Mesh sheet (11)> The tension during the gelation heat treatment in step 4) of Example 1 was changed to "machining direction tension 2 kgf / 10 cm × width direction tension 0.5 kgf / 10 cm" and the same as in Example 1 except that the mass was 440 g / m 2 , porosity 30% (having 196 voids in an area of ​​1 inch x 1 inch, the area of ​​the voids is approximately 1 mm 2 ), a pastel green mesh sheet (11) was obtained. The breathability, heat shielding rate, and flame resistance of the obtained mesh sheet (11) were equivalent to those of the mesh sheet (1). However, the stress at 10% tension in the width direction (based on JIS L1096A) was 74% of the stress at 10% tension in the longitudinal direction (based on JIS L1096A), which meant that the sheet was potentially prone to stretching in the width direction, and the dimensional balance between the warp and weft directions was poor. Therefore, when installed in a sheet shutter device, the repeated tension load during lifting and lowering caused relaxation (sagging) in the width direction. Therefore, it was not suitable for use in a sheet shutter device. [Industrial Applicability]

[0045] As is clear from the above examples and comparative examples, according to the present invention, a mesh sheet with excellent balance of dimensional stability in the warp and weft directions can be obtained, and therefore the sheet can be used for a lift-up open / close type sheet shutter device installed at the entrances and exits of factories and warehouses, as well as for safety enclosures and facade enclosures at construction sites such as building construction, renovation and demolition, as well as for pergolas (openable shade shelves) and swivel-openable furling shades, and can also be used in combination with conventional sheet materials as a partial replacement for sheets for the above uses.

Claims

1. A plain weave, twill, or imitation weave fabric is used as the base fabric, and a flame-retardant resin coating layer is provided on the entire surface of this base fabric, and a large number of voids (area 1 to 10 mm) are formed. ２ ) having a porosity of 10 to 33% and a mass of 350 to 650 g / m ２ A mesh sheet having a wind pressure resistance of 9 to 12 kg / m at a wind speed of 10 m / s. ２ and the stress (based on JIS L1096A) of the mesh sheet when tensile at 10% in the width direction is 90 to 110% of the stress (based on JIS L1096A) of the mesh sheet when tensile at 10% in the longitudinal direction.

2. 2. The mesh sheet according to claim 1, wherein the flame-retardant resin coating layer contains a near-infrared reflective metal oxide and has a heat-shielding effect.

3. The flame-retardant resin coating layer contains an antistatic substance, and the surface resistivity (in accordance with JIS K7194) is 10 9 3. The mesh sheet according to claim 1 or 2, which has a resistivity of Ω / □ or less and is effective in preventing soot and dust adhesion.

4. The mesh sheet according to any one of claims 1 to 3, wherein the flame-retardant resin coating layer contains a pyrethroid compound and has an insect repellent effect against flying pests with a KT50 knockdown time (the time required for 50% of test insects to be suppressed and unable to get up, regardless of whether they are dead or alive) of 30 minutes or less at room temperature.

5. 5. The mesh sheet according to claim 1, wherein the flame-retardant resin coating layer contains rubber crosslinks throughout the entire area, imparting cold-flexibility, the rubber crosslinks being a condensate of a liquid synthetic rubber having either a -COOH group or a -OH group at a molecular end with a polyisocyanate compound, and the liquid synthetic rubber is one or more selected from the group consisting of butadiene-based, isoprene-based, and farnesene-based rubbers.

6. The mesh sheet according to any one of claims 1 to 5, wherein the base fabric is made of multifilament yarns obtained by spinning a synthetic resin, and the synthetic resin is any one selected from the group consisting of 1) a synthetic resin synthesized from a monomer that does not contain the radioactive carbon atom C14, 2) a synthetic resin synthesized from a monomer that contains the radioactive carbon atom C14, 3) a synthetic resin molded product obtained by repolymerizing a monomer recovered from the depolymerization of the synthetic resin molded product, and 4) a synthetic resin molded product obtained by melting the synthetic resin molded product.