JP5376230B2 - Manufacturing method of industrial material sheet capable of rear projection - Google Patents

Description

  The present invention relates to an industrial material sheet capable of image projection by rear projection, and more specifically, a high-rise hotel, intelligent building, station building, airport, station building, underground shopping street, large commercial facility, amusement facility, wedding ceremony It relates to non-combustible industrial material sheets used for ceiling members and wall materials, wall signboards and construction materials for dome-shaped structures in funeral halls, general hospitals, and various public facilities, and in particular has a lighting shade function and a wide angle The present invention relates to a method for manufacturing a non-flammable flexible industrial material sheet having a rear projection screen function capable of being displayed in a transparent manner and conforming to the Building Standard Law.

  For lighting in commercial facilities, office buildings, schools, etc., the mainstream method is to keep the brightness and illuminance uniformity in the room by arranging a large number of fluorescent lamp units over and under the ceiling. However, the presence of fluorescent lamp units has become conspicuous, which has hindered the flexibility of facility space design. For this reason, although consideration has been given to cover the fluorescent lamp unit with a milky white acrylic resin light cover, or to protect the entire ceiling as a decorative color based on white, the fluorescent lamp unit itself still stands out. It was a difficult task to eliminate.

  Especially in high-rise hotels, intelligent buildings, station buildings, airports, large commercial facilities, amusement facilities, ceremonial occasions, general hospitals, and various public facilities, lighting designs that do not expose the lighting equipment itself are adopted. In recent newly built facilities, as a means of lighting that pursues more sophisticated and brighter spaces, almost all of the ceiling is made into a light shade, making the whole ceiling emit light, making the presence of fluorescent lamp units inconspicuous. Optical ceiling lighting is being introduced. The light ceiling is made by applying a long membrane material made of inorganic fiber fabric as the base material to the entire ceiling surface. In particular, it is compatible with the durability and workability of the building, and has excellent light diffusion as a lighting shade. Combines the effect and fluorescent lamp concealment effect.

  On the other hand, in various sales and service industries such as convenience stores, fast food stores, pubs, karaoke stores, gas stations, financial ATMs, etc., signboard display systems that display light both day and night are frequently used. The illuminated signage functions as night lighting as well as an effective display function for store names and advertisements. On the other hand, the walls of the stations, subway stations, underground shopping streets, and underground communication passages are filled with various advertising billboards. These advertising billboards are also indispensable for the underground space by combining lighting functions. There is no existence. It is also essential to display information such as evacuation guidance in buildings and underground facilities.

  As these internally illuminated advertising signs, the mainstream is a type that prints or marks on an acrylic resin plate with light diffusibility and obtains a rooster effect with a fluorescent lamp provided on the back side of the signboard. For high-sized signboard applications, high flameproof performance and impact strength are required. For example, a fiber-reinforced flexible membrane made of polyester fiber fabric and laminated on both sides with soft vinyl chloride resin film is internally illuminated. It is used for signboards, and in particular for indoor use, a flame-retardant flexible membrane material based on an inorganic fiber fabric is used.

  On the other hand, at amusement facilities, event venues, and amusement facilities, color and light entertainment are provided by directing the regular partition walls to guide visitors smoothly. A technique for enhancing is used. In addition, in the case of amusement facilities constructed in small to medium dome-shaped sealed spaces, such as tropical botanical gardens, heated pools, planetariums, aquariums, various theme buildings, etc., the shadows and colors of the external illumination transmitted light are extremely effective. It becomes a thing with high property.

  The light ceiling lighting is based on a simple white flat appearance and can provide a calm and calm space, so it is particularly suitable for waiting areas in public facilities and hotel entrances, and events in large halls. In symposiums and symposiums, it contributes to the effect of sustaining the interest and concentration of the audience and audience. For this reason, there are few examples of gorgeous prints and decorations on the light ceiling, but at the ceremonial occasions and party event venues, the possibility of using a white flat appearance like a light ceiling as a projection screen is possible. have.

  Also, in the underground streets and the crowded streets in the underground shopping streets, there is a high consciousness of requesting a destination display mark on the ceiling in the traveling direction, and thereby display plates such as exit guides and toilet positions are installed on the ceiling. Therefore, it is effective to attach design or advertisement display directly to the optical ceiling itself in the underground shopping area or underground shopping street, however, it is a tradeoff with the frequency of update cycle due to the diversity of advertisement display and the work of ceiling construction. For this reason, wall signs are generally used for advertisement display in station buildings, underground shopping streets, and underground shopping streets. However, the display of these internally illuminated signboards is mainly based on the combination of letters, symbols, and photographs, and the display function is largely removed. It was a presence.

  Recently, displays that display images and moving images by projecting digital data onto a glass show window or screen have become widespread. Projector projection for commercial use such as advertisements is mainly back projection with a projector placed on the back of the screen so that human shadows do not get in the way, and it has both translucency and light diffusibility as a rear projection screen By using a synthetic resin sheet, it is possible to display a clear image while hiding the projector light source. By applying such a transmissive screen and a projector to an optical ceiling or an internally illuminated advertising signboard, it is possible to freely switch and display an image or project a moving image. Further, for example, in Japanese Patent Application Laid-Open No. 2004-77634 (Patent Document 1), a display device is provided on the ceiling surface of an underground shopping mall or a large complex commercial building, and an actual outdoor scenery is projected on the wide-angle video on the underground shopping mall. In addition, navigation system devices that make it easy to grasp the current position and direction in a building have been proposed.

  Although several proposals have been made to display videos on the ceiling and interior lighting signs, images and videos are actually projected on the ceiling of underground shopping streets and underground shopping streets, or wall billboards in underground shopping streets It was difficult to use images and videos on the screen. The reason is the relationship between the visual field of the pedestrian (observer) and the clear image recognition. In the projection of images and videos, the viewpoint of the pedestrian faces the projector direction, and the field of view of 60 ° up, down, left and right is the most recognizable, but the viewer can clearly see the projection of images and videos. The line of sight when passing is directed forward. For this reason, it is rare to stop and look up at the ceiling or turn left and right when reaching the projection point of images and videos. In other words, in order to effectively produce images and videos on the ceiling and side walls of underground shopping streets and underground shopping streets, it is necessary to project images and videos that can be recognized from an extremely oblique direction. The reality is that the recognizability from an oblique direction is inferior, and in particular, in the projection on a ceiling or side wall having a curved surface, it is a problem that the recognizability of the projected image is further inferior.

  From such a viewpoint, a projection screen having both light diffusibility and anti-glare property has been developed. For example, in Japanese Patent Application Laid-Open No. 2005-24942 (Patent Document 2), a plastic film is used as a support, and a light diffusion layer is provided thereon. A transmissive screen having a haze of 80% or more, a total light transmittance of 60% or more, and a specular gloss of 10% or less is disclosed. On the other hand, proposals have been made to apply haze due to sea-island dispersion generated by blending incompatible thermoplastic resins to a light diffusion sheet. (Patent Documents 3 and 4) However, these light diffusing sheets have a defect that the image is blown out when a projector image is projected, and it is necessary to tighten the color contrast by using a black halftone or the like. By using such a projection screen, it is possible to recognize images and movies from a variety of positions. However, since this projection screen does not have nonflammability that complies with the Building Standards Law, ceiling members and wall materials It cannot be used as a building member. In other words, high-rise hotels, intelligent buildings, station buildings, airports, station buildings, underground shopping halls, large commercial facilities, amusement facilities, ceremonial occasions, Incombustibility that complies with the Building Standards Act is necessary as a fire countermeasure for use in building materials such as general hospitals and various public facilities.

  Therefore, it is an industrial material sheet that has nonflammability that complies with the Building Standards Act, and has light transmission and projection properties, and the projected image can be clearly recognized from an oblique direction, and also on the curved surface portion. If there are building materials that can be projected, they are used as light ceiling members, light wall materials, interior lighting signage materials, high-rise hotels, intelligent buildings, station buildings, airports, station buildings, underground shopping streets, large commercial facilities, amusement facilities, Widely used in ceremonial occasions, general hospitals, and various public facilities, and is also used as a lighting function to project digital images and videos, thereby adding entertainment to information transmission and directing in the amusement field. It can be expected to be used in various ways such as dramatically improving the effects. In addition, as a means for providing visual information in place of announcements, it is expected to be used for event holding guidance, news reporting, and emergency evacuation guidance in the event of a disaster.

JP 2004-77634 A JP 2005-24942 A JP 2001-272511 A JP 2001-31774 A

  The present invention is an industrial material sheet having good light transmission and clear projector projection, and the projected image can be clearly recognized even from an oblique direction, and in particular, an optical ceiling member having a curved surface portion It can be used for building materials such as light wall materials, interior lighting signage materials, dome-shaped structural materials, etc., and also has an incombustible industrial material sheet that conforms to the Building Standards Law, and a projector on the back of this industrial material sheet An optical ceiling system, a light wall system, an interior lighting signage system, and a dome-shaped structure system are provided.

In order to solve the above problems, the present inventor has provided a flexible resin layer having a sea-island structure in which either a sea component or an island component contains a colorant on one side or more of a woven fabric comprising a drawn filament. In a light diffusing and transmitting sheet including a composite base material formed by laminating, a sea-island structure is composed of two types of synthetic resins or two types of liquid synthetic resins and a synthetic resin incompatible couple. As a colorant-containing synthetic resin by coloring one synthetic resin in advance , 1) Volume ratio of 10: 1 to 10 of this colorant-containing synthetic resin and the other synthetic resin forming a synthetic resin incompatible pair : A sea-island structure composed of a colored sea component and a non-colored island component is formed by melt-mixing or stirring and mixing within the range of 7), or 2) or another synthetic resin-incompatible pair with a colorant-containing synthetic resin With synthetic resin Product ratio 1:10 to 7:10 melt mixed in the range of, or by forming a sea-island structure by coloring island component and non-colored sea component by stirring and mixing, exhibits a contrast adjustment function, the influence of the viewing direction thereby In addition, the present inventors have found that the recognizability of a projected image in observation from an oblique direction is dramatically improved and can be projected onto a curved surface portion, and the present invention has been completed.

That is, the method for producing an industrial material sheet capable of rear projection according to the present invention includes a flexible resin layer having a sea-island structure in which either a sea component or an island component contains a colorant, and a woven fabric comprising stretched filaments. In a light diffusing and transmitting sheet including a composite base material laminated on one side or more, the sea-island structure is composed of two types of synthetic resins or synthetic resins incompatible with two types of liquid synthetic resins. One synthetic resin forming an incompatible pair is colored in advance to form a colorant-containing synthetic resin. 1) Volume ratio of the colorant-containing synthetic resin and the other synthetic resin forming the synthetic resin incompatible pair The above-mentioned sea-island structure is formed by colored sea components and non-colored island components by melt-mixing or stirring and mixing in the range of 10: 1 to 10: 7, or 2) or the colorant-containing synthetic resin and the synthesis The other volume ratio and a synthetic resin forming the fat heterologous溶対1:10 to 7:10 melt mixed in the range of, or by stirring and mixing to form the sea-island structure by coloring island component and non-colored sea component Is preferred. In the method for manufacturing an industrial material sheet capable of rear projection according to the present invention, the island component preferably includes a colorant in the sea-island structure. In the method for manufacturing an industrial material sheet capable of rear projection according to the present invention, the colorant preferably contains either a white pigment or a black pigment. The method for producing an industrial material sheet capable of rear projection according to the present invention is a mixture of three or more pigments wherein the colorant is selected from blue (cyan), red (magenta), yellow (yellow), and black (black). It is preferable that In the manufacturing method of an industrial material sheet capable of rear projection according to the present invention, the drawn filament has a drawing direction a and a drawing vertical direction b with respect to the drawing direction a, and the refractive index n1 of the flexible resin layer. And the absolute value | n1-na | of the difference between the drawing filament and the refractive index na in the drawing direction satisfies the following formula 1, and the refractive index n1 of the flexible resin layer and the refractive index in the drawing vertical direction b It is preferable that the absolute value | n1−nb | of the difference from nb has an optical characteristic that satisfies the following formula 2.
0 <| n1-na | ≦ 0.2 Formula 1
| N1-nb | ≦ 0.2 Formula 2
The method for producing an industrial material sheet capable of rear projection according to the present invention is based on a radiant electric heater for the light diffusive transparent sheet in the cone calorimeter test method (ASTM-E1354). When radiant heat is applied at 50 kW / m ² , the total calorific value for 20 minutes after heating is 8 MJ / m ² or less, and 20 minutes after heating is started for 10 seconds or more, and the maximum heat generation rate is 200 kW / m. It preferably has nonflammable properties not exceeding ² .

  According to the present invention, it is possible to provide an industrial material sheet having good light transmission and clear projector projection, and the projected image can be clearly recognized even from an oblique direction. Can be used suitably for building materials such as optical ceiling members, optical wall materials, interior lighting signage materials, and dome-shaped structural materials. In addition, since the industrial material sheet of the present invention has non-combustibility particularly conforming to the Building Standard Law, an optical ceiling system, a light wall system, and an interior lighting signboard in which a projection device such as a projector is arranged on the back of the industrial material sheet. System, dome-like structure system, ceiling members and high-rise hotels, intelligent buildings, station buildings, airports, station buildings, underground shopping streets, large commercial facilities, amusement facilities, ceremonial occasions, general hospitals, and various public facilities It can be widely used for wall materials, wall signs, dome-shaped structural materials, etc., and it can be used as an illumination function to project digital images and moving images, to add entertainment to information transmission, and to produce effects in the amusement field. It can be used for various purposes such as dramatic improvement. Furthermore, as a means for providing visual information in place of announcements, it is also possible to use event holding guidance, news reporting, and emergency evacuation guidance in the event of a disaster.

Drawing showing drawing direction and drawing vertical direction of drawn filament (a) Drawing direction a (b) Drawing vertical direction b The figure which shows an example of the light-diffusion transparent sheet of this invention Diagram showing the state of projection from a wide-angle lens The figure which shows the state projected from the diagonal direction Diagram showing the difference in light diffusivity depending on the incident angle of light The figure which shows the state which was reflected and reflected in the mirror Diagram showing an example of a rear projection system used on the ceiling The figure which shows an example of the use of the rear projection system used for the ceiling Figure showing an example of a rear projection system used on a wall The figure which shows an example of the rear projection system used for the dome which projects toward the inside The figure which shows an example of the rear projection system used for the dome which projects toward the outside Diagram showing an example of a rear projection system used for a signboard In Example and Comparative Example, the image projected from the back side of the industrial material sheet installed on the optical ceiling is shown in a vertical direction and a state observed from an angle of 15 degrees with respect to the surface. (A) Plane construction (b) Curved surface Construction The figure which shows the positional relationship of an image projector and an observer at the time of evaluating a projection screen function in an Example and a comparative example. The figure which shows the sea island structure of a flexible resin layer, and shows the state in which an island component contains a coloring agent The figure which shows the sea island structure of a flexible resin layer, and shows the state in which a sea component contains a coloring agent The figure which shows the sea island structure of a flexible resin layer, and shows the state in which an island component contains a white pigment The figure which shows the sea island structure of a flexible resin layer, and shows the state in which a sea component contains a white pigment

  In the industrial material sheet of the present invention, the drawn filaments used for the knitted fabric include polypropylene fibers, polyethylene fibers, polyester fibers, nylon fibers, vinylon fibers, long fibers made of synthetic fibers such as acrylic fibers, diacetate fibers, triacetate fibers, etc. Long fibers made of semi-synthetic fibers, regenerated fibers such as rayon fibers and polynosic fibers, and long fibers made of inorganic fibers such as glass fibers, silica fibers, alumina fibers, etc., and these may be used alone or mixed and blended. . The drawn filament is preferably a multifilament yarn or a monofilament yarn. In the present invention, a multifilament yarn having 3 to 300 filaments and a fineness of 138 to 2223 dtex (decitex), particularly 277 to 1112 dtex is preferred. Stretched filaments are melt-spun unstretched long fiber spinning yarns that are stretched 3.0 to 5.0 times by heat stretching or cold stretching near room temperature, and the fiber microstructure is aligned and crystallized. It is. These stretched filaments have a stretching direction a as shown in FIG. 1A and a stretched vertical direction b with respect to the stretching direction as shown in FIG. Here, in the case of synthetic fiber, semi-synthetic fiber, and regenerated fiber as the drawn filament, the refractive index na in the drawing direction a and the refractive index nb in the drawing vertical direction b are obtained by arbitrarily orienting the crystal structure of the polymer by drawing. Can be adjusted as appropriate. When an amorphous inorganic material such as glass fiber is used, na and nb are equal.

  As the knitted fabric used in the present invention, a woven fabric or a knitted fabric is used. Examples of the woven fabric include known woven fabrics such as plain weave, twill weave, satin weave and imitation weave. It is preferable because it is excellent in the balance of the physical properties of the industrial material sheet. As the knitted fabric, Russell knitted weft insertion tricot is preferably used. These knitted fabrics are coarse knitted fabrics comprising a plurality of warp yarns in which a large number of inter-gap gaps are arranged in parallel and a weft in which a large number of inter-gap gaps are arranged in parallel in a uniform manner (porosity 5-50%). And non-coarse knitted fabric (porosity less than 5%). Among these, a high-density knitted fabric having a porosity of 0 to 5% formed between the interlaces of the warp and weft yarns is particularly preferably used from the viewpoints of the reinforcing effect and the light diffusion effect. The knitted fabric may be subjected to scouring or heat treatment to remove the oil or paste, and corona discharge treatment for the purpose of making it easy to get wet with the flexible resin processing liquid and improving the adhesion with the flexible fat layer. Plasma discharge treatment, silane coupling agent treatment, or the like may be performed.

  In the industrial material sheet of the present invention, the flexible resin layer is a synthetic resin immiscible pair composed of a melt of two types of synthetic resins or a stirred mixture of two types of liquid synthetic resins. Synthetic resins preferably used in the present invention include, for example, vinyl chloride resins, vinyl chloride copolymer resins, olefin resins (PE, PP, etc.), olefin copolymer resins, urethane resins, urethane copolymer resins. , Acrylic resin, acrylic copolymer resin, vinyl acetate resin, vinyl acetate copolymer resin, styrene resin, styrene copolymer resin, polyester resin (PET, PEN, PBT, etc.), polyester copolymer resin , Fluorine-containing copolymer resins, silicone resins, silicone rubbers, polycarbonates, polyamides, polyethers, polyester amides, polyphenylene sulfides, polyether esters and other thermoplastic resins, and vinyl ester resins.

  In the present invention, the flexible resin layer has a cloudy appearance made of an incompatible mixture of two types of synthetic resins, and there is no limitation on the combination of synthetic resins as long as they are incompatible. Examples of incompatible combinations include vinyl chloride resin and polyethylene, vinyl chloride resin and polypropylene, vinyl chloride resin and polystyrene, vinyl chloride resin and silicone resin, vinyl chloride resin and fluorine-containing copolymer resin, polystyrene and polyethylene, polystyrene And polypropylene, urethane resin and polyethylene, urethane resin and polypropylene, polyester resin and polyethylene, polyester resin and polypropylene, polyamide and polycarbonate, acrylic resin and polystyrene, acrylic resin and polycarbonate, polyamide and polystyrene, polyamide and polypropylene, and the like. Another type of thermoplastic resin can also be contained with respect to these incompatible thermoplastic resin pairs.

  A mixture of these synthetic resin incompatible pairs shows a phase separation structure, and a sea-island structure is particularly preferable. In this sea-island structure, the sea component and the island component are composed of different types of resins. For example, in an incompatible mixture composed of the thermoplastic resin A and the thermoplastic resin B, the ratio of the thermoplastic resin A and the thermoplastic resin B is set. The sea component can be composed of the thermoplastic resin A, the island component can be composed of the thermoplastic resin B, the sea component can be composed of the thermoplastic resin B, and the island component can be composed of the thermoplastic resin A. it can. The ratio of the resin constituting the island component is 10 to 70% by volume (preferably 20 to 50% by volume) with respect to the volume of the resin constituting the sea component, and the island component content is 9 to 9% with respect to the entire flexible resin layer. 41.1% by volume (preferably 16.6 to 33.3% by volume). In addition, when another type of thermoplastic resin C is contained with respect to the incompatible thermoplastic resin pair AB, the island component is an island component by the thermoplastic resin B and an island component by the thermoplastic resin C in the sea-island structure. Similarly, the island component may be composed of an island component made of the thermoplastic resin A and an island component made of the thermoplastic resin C.

  The shape of the island component is spherical, distorted spherical, meteorite, rugby ball or the like. The average particle size of the island component is 0.1 to 50 μm, and particularly preferably 0.1 to 30 μm. By making the size of the island component larger than 0.1 μm, a good light diffusion effect can be obtained while maintaining the total light transmittance in the flexible resin layer. In the present invention, the flexible resin layer preferably has a difference in refractive index between the synthetic resin constituting the sea component and the synthetic resin constituting the island component. If the refractive indexes are the same, the refractive scattering phenomenon does not occur at the interface between the sea component and the island component, and a sufficient light diffusion effect cannot be obtained. The refractive index difference for obtaining good light diffusibility is 0.01 or more, more preferably 0.05 or more, and the condition constituting the refractive index difference is the refractive index on either side of the sea component and the island component. Can be high. The refractive index can be obtained by an Abbe refractometer using the D line as a light source.

  In the present invention, the flexible resin layer has a sea-island structure composed of an incompatible mixture of two types of synthetic resins, and in the sea-island structure, either the sea component or the island component contains a colorant. Yes. In order to color either the sea component or the island component including a colorant, one of the two types of synthetic resins constituting the incompatible mixture is colored in advance, and the non-colored synthetic resin and the colored synthetic resin By the melt mixing, a configuration with a colored sea component and a non-colored island component or a configuration with a non-colored sea component and a colored island component can be obtained. In the mixture of the present invention, the colored synthetic resin component does not mix with the non-compatible non-colored synthetic resin component, so the non-colored synthetic resin component is not colored by the colorant contained in the colored synthetic resin component. . In the present invention, the sea-island structure may be colored with a different colorant between the sea component and the island component. The colorant that colors the sea component or the island component has a function of displaying the image projected from the image projection device (projector) more vividly and vividly. In the industrial material sheet of the present invention, the island component is preferably colored in the flexible resin layer. Further, in the industrial material sheet of the present invention, the flexible resin layer is colored with either the sea component or the island component, so that the light diffusion effect of the image projected from the back surface is improved and at the same time good. Since light transmittance can be ensured, it is possible to display images with higher brightness and vivid colors.

  It is indispensable for the colorant used for coloring the sea component or the island component to display a colorful image that contains either a white pigment or a black pigment. In order to use the industrial material sheet of the present invention as a rear projection film material in a relatively bright place, it is particularly preferable to use a black pigment. Further, when the main use is usually as a light ceiling, a light wall, or a backlit signboard, it is particularly preferable to use a white pigment. As the black pigment, known black pigments such as carbon black, aniline black and titanium black can be used. The colorant is preferably light-transmitting black, and organic pigments such as blue, red and yellow can be used in combination as required. Also, without using known black pigments such as carbon black, aniline black, titanium black, etc., black coloration may be achieved by mixing three primary colors of organic pigments of blue (cyan), red (magenta), and yellow (yellow), Black can be adjusted by using black (carbon black, aniline black, titanium black) in combination with the three primary colors.

  Examples of white pigments include metal oxides, metal hydroxides, metal composite oxides, metal composite hydroxides, and the like. Specifically, these include aluminum oxide, magnesium oxide, barium oxide, titanium oxide, zinc oxide, and oxide. Metal oxides such as tin, zirconium oxide, molybdenum oxide, antimony oxide, silicon oxide (silica), and metal composites such as zinc borate, zinc metaborate, barium metaborate, aluminum borate, potassium titanate, zirconium-antimony An oxide etc. are mentioned. Also, metal hydroxides such as aluminum hydroxide, magnesium hydroxide, calcium hydroxide, barium hydroxide, zirconium hydroxide, basic magnesium carbonate, and hydrates of dolomite, hydrotalcite, zinc hydroxystannate, tin oxide And metal composite hydroxides such as borax, and other white fine particles include barium sulfate, calcium carbonate, talc, clay, montmorillonite, and bentonite. The particle diameter of these white pigments is preferably 0.25 to 10 μm.

  In the present invention, the flexible resin layer has a uniform overall thickness of 0.05 to 1.0 mm, preferably 0.1 to 0.5 mm, and the colorant content contained in the sea component and the island component is 0. 0.01 to 10% by mass, preferably 0.05 to 5.0% by mass. In particular, when the island component contains a colorant, the ratio of the island component is 10 to 70% by volume (preferably 20 to 50% by volume) with respect to the sea component, and the island component content with respect to the entire flexible resin layer is It is 9-41.1 volume% (preferably 16.6-33.3 volume%).

  Examples of the method for providing the flexible resin layer on the woven fabric in the present invention include a resin incompatible mixture dispersed in an organic solvent, a resin emulsion (latex) incompatible mixture, a resin dispersion incompatible mixture, a soft Using a paste sol incompatible mixture mainly composed of polyvinyl chloride resin, an incompatible mixture mainly composed of thermosetting resin, etc., known coating methods such as dipping (double-sided processing on woven fabric), coating Examples of the coating include (single-sided processing or double-sided processing on a fiber fabric). Also, a method of laminating a 0.05-1.0 mm film or sheet made of an incompatible thermoplastic mixture, formed by calender molding, T-die extrusion method on a woven fabric, through an adhesive or by thermal lamination, And the combination of these coating and lamination can be illustrated. At this time, the absolute value | n1-na | of the difference between the refractive index n1 of at least the flexible resin layer directly laminated on the woven fabric and the refractive index na in the drawing direction of the drawn filament is 0 <| n1-na | ≦ 0.2, and the absolute value | n1-nb | of the difference between the refractive index n1 of the flexible resin layer and the refractive index nb in the drawing vertical direction of the drawn filament is | n1-nb | ≦ 0.2 It is preferable to appropriately select the flexible resin and the drawn filament so as to satisfy the above.

  The industrial material sheet of the present invention is preferably a light diffusive and transparent sheet having a visible light transmittance (JIS Z8722) of 40 to 90%. If the visible light transmittance is less than 40%, it will not be able to perform a sufficient lighting function when used in an optical ceiling, light wall, interior lighting signboard, or dome-shaped structure, and at the same time, the image projected from the back will be dark and sufficient. Luminance may not be obtained, and if it exceeds 90%, there may be a problem that the reproducibility of the contrast and hue of the image projected from the front and back is insufficient.

  With respect to the industrial material sheet of the present invention, the light diffusive and transparent sheet of FIG. 2 will be described as an example. 2 uses a plain woven fabric as the knitted fabric (1), and the flexible resin layer (2-1) is formed on both sides of the woven fabric by dipping the incompatible resin processing liquid. The flexible resin layer (2-2) is formed by coating an incompatible resin processing liquid on one surface thereof. At this time, if the combination of the resin constituting the flexible resin layer (2-1) and the drawn filament is selected such that | n1-nb | Since the difference between the refractive index nb, that is, the refractive index nb of the drawn filament in the direction perpendicular to the front and back surfaces of the woven fabric and the refractive index n1 of the flexible resin, light is refracted at the interface between the drawn filament and the flexible resin. There is little or no occurrence, and the woven fabric contained in the industrial material sheet is hardly visible. When projected from the front side with either side of this light diffusive transmissive sheet as the front side, light is diffused by the sea-island structure (island component contains colorant) contained in the flexible resin layer, and viewed from the front side. Even when projected from the back and viewed from the front, the woven fabric is hardly visible, so there is no shadow due to stretched filaments and the same vividness as when projected from the front. Video can be projected.

When projected from the back in actual use, the distance between the image projection device and the screen cannot be sufficient, and projection is performed from a wide-angle projection lens as shown in FIG. 3, or as shown in FIG. Sometimes it is projected from an oblique direction. At this time, for example, when using a diffusion plate having isotropic diffusivity simply kneaded with light diffusing particles, the central portion is bright when projected from a video projection device having a wide-angle projection lens. When the part is dark and projected from an angle, there may be a brightness difference in the projected image, for example, the part near the video projector is bright and the part far away is dark, but this is not the case with the industrial material sheet of the present invention. An image with almost uniform brightness can be obtained with little difference in brightness. The reason why such an effect is obtained is not clear, but is presumed as follows.
1, for example, in FIG. 5, when a light diffusion / transmission sheet is assumed in which the refractive index nb in the extending vertical direction of the drawn filament is substantially equal to the refractive index n <b> 1 of the flexible resin layer, Light (Lv) incident from the vertical direction is a flexible resin and a drawn filament α.
(1-a) At either the interface between the flexible resin and the drawn filament β (1-b), it enters from the drawing vertical direction of the drawn filament and is not refracted and diffused.
2. On the other hand, the light (Ls) incident from the oblique direction of the light diffusive transmissive sheet is incident on the stretched filament α (1-a) from the stretch direction a, and the bending rate of the stretched filament in the stretch direction a. Absolute value | n1-n of the difference between na and the refractive index n1 of the flexible resin layer laminated on the woven fabric
Since a | exceeds 0 and is 0.2 or less, a | is slightly refracted and diffused moderately at the interface between the flexible resin and the stretched filament α, and the brightness increases at the part where the light is incident obliquely.
3. At the interface between the flexible resin and the stretched filament, there is little diffusion in the portion where light is incident at an angle close to vertical, and light incident from an oblique angle is diffused. For this reason, there is less variation in brightness due to the incident angle of light compared to a screen that only incorporates a light diffusing substance, so that the projected image can be recognized even by observation from an oblique direction. Can also be projected. In FIG. 5, the expression of particles made of a light diffusing substance is omitted.

  If any one or both of | n1-na | and | n1-nb | exceeds 0.2 in the industrial material sheet of the present invention, the light diffusion at the interface between the flexible resin and the drawn filament becomes excessive, and the industrial material The light transmittance of the sheet decreases, and the shadow of the stretched filament becomes conspicuous when projected from the back, and it may be impossible to view a clear image from the front of the sheet when projected from the back of the sheet. If | n1-na | is 0, moderate light diffusion cannot be obtained at the interface between the flexible resin and the drawn filament, and when projected from a wide-angle video projector, the central portion is bright and the peripheral portion is When it is dark and projected from an oblique direction, a portion close to the image projection device is bright and a far portion is dark, resulting in a difference in brightness, and the recognizability may be inferior when viewed from an oblique direction.

  In the industrial material sheet of the present invention, the above-mentioned light diffusive transparent sheet is a protective resin on one or both surfaces for the purpose of preventing scratches on the surface, adhesion of dirt, migration of various additives to the surface, etc. It is preferable to have a layer. The protective resin layer is preferably a resin layer having antifouling properties. These include, for example, acrylic resins, fluorine copolymer resins, acrylic-silicon copolymer resins, acrylic-fluorine copolymer resins, and acrylic-urethane copolymer resins. And a resin layer comprising a blend of an acrylic resin and a fluorine-based copolymer resin, and silica fine particles, colloidal silica, and organosilicate. Examples of forming this protective resin layer include applying a coating solution such as spray coating, gravure coating, bar coating, etc. with a solution of a resin soluble in a solvent or water, or an emulsion liquid in which a resin is dispersed in a dispersion medium such as water. Formation by drying, formation by laminating a film having a fluorine-containing resin or a fluorine-containing copolymer resin on the outermost surface by an adhesive or hot melt processing. Further, it is preferable to provide a photocatalytic layer containing a photocatalytic inorganic material (for example, photocatalytic titanium oxide / photocatalytic tungsten oxide) on these protective resin layers from the viewpoint of imparting antifouling properties. Especially in indoor applications such as light ceilings, light walls and signboards with fluorescent lamps, it is possible to form a photocatalyst layer containing a visible light active photocatalytic inorganic material from the viewpoint of imparting antifouling properties by self-cleaning. preferable.

  In the industrial material sheet of the present invention, the flexible resin layer may contain a known additive as required. Examples of the additive include an antistatic agent, a flame retardant, a plasticizer, a flexibility imparting agent, a filler, an adhesive, a crosslinking agent, an ultraviolet absorber, an antioxidant, a stabilizer, a leveling agent, an antifoaming agent, Antibacterial agents, antifungal agents, colorants, fluorescent whitening agents, fluorescent pigments, phosphorescent pigments and the like can be mentioned.

The industrial material sheet of the present invention is preferably a light diffusive and permeable sheet having flame retardancy or incombustibility as defined by the Fire Service Law or the Building Standards Law. For this reason, the industrial material sheet and the rear projection system are mounted. In an exothermic test (ASTM-E1354: corn calorimeter test method) in which an industrial material structure is irradiated with radiant heat of 50 kW / m ² using a radiant electric heater, the total calorific value for 20 minutes after the start of heating is 8 MJ / m ² or less, and the heating start after 20 minutes, it is preferable maximum heat generation rate is a light diffusing transparent sheet having a non-flammable satisfying that does not exceed 200 kW / m ² continued for more than 10 seconds. Such an incombustible industrial material sheet is made of a glass fiber woven fabric (non-sealed plain weave with a basis weight of 200 to 300 g / m ² and a porosity of 1% or less) as a base material, and a flexible resin on one or more sides thereof. Obtained by providing a layer.

An example of the industrial material sheet of the present invention is a rear projection system in which a video projection device is arranged on the rear surface of the industrial material sheet of the present invention. In this system, the flexible resin layer has a sea-island structure made of an incompatible mixture of two or more kinds of thermoplastic resins. In this sea-island structure, either the sea component or the island component contains a colorant. Yes. Further, in this system, the absolute value | n1-na | of the difference between the refractive index n1 of the flexible resin layer and the refractive index na in the drawing direction of the drawn filament satisfies the following formula 1, and the refraction of the flexible resin layer: The absolute value | n1-nb | of the difference between the refractive index n1 and the refractive index nb in the stretched vertical direction b satisfies the following formula 2 so that when the image projected from the back is viewed from the front, The included woven fabric is hardly conspicuous, has excellent color reproducibility, and can recognize a clear image even when observed from an oblique direction, so that it can be projected onto a ceiling or wall having a curved surface.
0 <| n1-na | ≦ 0.2 Formula 1
| N1-nb | ≦ 0.2 Formula 2
Moreover, since the industrial material sheet is a light diffusive and permeable sheet reinforced with a woven fabric containing stretched filaments, it has sufficient strength and durability as an industrial material structure. The rear projection system of this example uses an industrial material sheet (3) as a projection screen, and a video projection device (4) is placed on the rear side of the projection screen, allowing the image projected from the video projection device to be viewed through the industrial material sheet. It has the composition to do. If there is not enough space on the back, use a video projection device with a wide-angle lens as shown in FIG. 3, or project diagonally from a video projection device arranged in either the top, bottom, left, or right direction as shown in FIG. As shown in FIG. 6, it is possible to use a method of projecting the image by reflecting it from the image projection device arranged in either the top, bottom, left or right direction to the mirror (5).

In the rear projection system of this example, the light diffusive transparent sheet is irradiated with radiant heat by a radiant electric heater at 50 kW / m ² with respect to the light diffusive transmissive sheet in the cone calorimeter test method (ASTM-E1354). An industrial material sheet that has a total heat generation amount of 20 MJ / m ² or less for 20 minutes after the start of heating and that has a maximum heat generation rate of not exceeding 200 kW / m ² for 20 minutes after the start of heating for 10 seconds or longer when irradiated. By doing so, the rear projection system can be applied to uses that require nonflammability as stipulated in the Building Standards Act.

  In this example, the video projection device is selected from conventionally known video projection devices such as a slide projector, a film projector, a planetarium projector, a laser projector, an overhead projector, and a video projector, and used alone or in combination of two or more. be able to. Among these, a video projector is preferably used because it can support projection of various video sources such as television, video, DVD, Blu-ray, and computer images. In particular, when projecting computer-processed images via a video projector, still images and movies stored on the computer's hard disk, information delivered to the computer via a LAN, still images, movies, live camera images, TV images received by the built-in receiver can be selected at any time and combined display can be performed as necessary. The image projection device does not need to be fixed, can be installed so that the projection angle can be controlled, can be moved linearly by running on the rail, can be installed so that the plane can be moved by an XY stage, and a crane, etc. By installing the 3D so as to be movable, the projection position can be freely changed. The rear projection system according to the present invention can be combined with audio information, sound effects, background music, and the like in combination with an audio device. The timing and combination of video display, control of the projection position by changing the projection angle and position of the video projection device, and audio control can be set by a computer program or directly controlled by the operator. A rear projection system with a high degree of freedom and rich expressiveness can be constructed.

  FIG. 7 shows an example of a rear projection system using the industrial material sheet of the present invention on the ceiling. As the industrial material sheet, a light diffusive and transparent sheet that satisfies the nonflammability required for the ceiling material and has sufficient strength and durability is used. Therefore, it can be used suitably for large area ceilings in high-rise hotels, intelligent buildings, station buildings, airports, station buildings, underground shopping streets, large commercial facilities, amusement facilities, ceremonial occasions, general hospitals, and various public facilities. It can be used for ceilings in elevator cars and railcars. The light diffusing and transmitting sheet may be used on the entire surface of the ceiling, or may be used only on a desired part. When simultaneously projecting on a large area, a plurality of video projection devices may be arranged. By placing the lighting device (6) on the back of the light diffusing and permeable sheet (3), it can be used as an optical ceiling system when the projection system is not used, and at the same time with a part of the ceiling in the state of lighting. It can also be used to project images. Further, if monochromatic light is projected from the video projection device and used as a substitute for the lighting device, the projection system and the optical ceiling system can be used only by the video projection device. The shape of the ceiling is not limited to a flat shape as shown in FIG. 7, but may be a curved shape such as an arch shape or a dome shape, and a clear image can be obtained regardless of the image projection angle or the angle viewed by the observer. it can. FIG. 8 shows an example in which the rear projection system of FIG. 7 is used for the ceiling of an underground shopping street passage. A light diffusive and transparent sheet (3) is used on the entire surface of the ceiling, and it normally functions as an optical ceiling by turning on the lighting device (6). However, an image is projected at an arbitrary position at an arbitrary timing. Thus, for example, it is possible to use information such as posting information prompting underground passers-by to visit the store (9) in a timely manner.

  FIG. 9 shows an example of a rear projection system using the industrial material sheet of the present invention on a wall. As the industrial material sheet, a light diffusive and transparent sheet that satisfies the non-combustibility standards required for wall materials and has sufficient strength and durability is used. As in the case of use on the ceiling, it may be used on the entire wall surface, or may be used on only a desired part. If the illuminating device (6) is arranged on the back of the light diffusive permeable sheet (3), it can be used as a wall surface having an illumination function, and the image can be projected onto a part of the wall surface at the same time with the illumination turned on. Is possible. As in the case of the ceiling, the shape of the wall is not limited to a flat shape as shown in FIG. 9, but may be a curved shape, and a clear image can be obtained regardless of the image projection angle or the angle viewed by the observer.

  FIG. 10 shows an example of a rear projection system using the industrial material sheet of the present invention as a dome. As an industrial material sheet, a light diffusive and transparent sheet that satisfies the flame retardant standard and non-flammable standard required for a dome material and has sufficient strength and durability is used. The light diffusion / transmission sheet (3) has a two-layer structure in which a dome for projection is formed as an inner film, and a dome using a light-shielding industrial material sheet (7) is formed as an outer film on the outer side. The projection device (4) is disposed between the inner curtain and the outer membrane. By arranging a light-shielding outer membrane, the projected image can be viewed inside the dome even in the daytime. When simultaneously projecting on a large area, a plurality of video projection devices may be arranged. In addition, as shown in FIG. 11, by arranging the image projection device (4) inside the dome as a one-layer dome structure, an industrial material structure that displays an image toward the outside of the dome can be obtained. These projection domes may be entirely constituted by the industrial material sheet of the present invention, or only a part of the industrial material sheet of the present invention may be used. In the dome-shaped industrial material structure, since the light diffusing and transmitting sheet (3) is installed in a curved surface, the light diffusing and transmitting sheet (3) is formed by the portion of the image projected from one image projection device (4). ), And when multiple observers observe from different positions, the same image will be observed from different angles, but the industrial material structure in this example projects A clear image can be obtained regardless of the viewing angle.

  FIG. 12 shows an example of a rear projection system using the industrial material sheet of the present invention as a signboard. As the industrial material sheet, a light diffusive and permeable sheet that satisfies the incombustible standard required as a signboard material in a fire prevention area and has sufficient strength and durability because it includes a woven fabric is used. The image is projected from the image projection device arranged at the lower part to the mirror (5) and projected onto the light diffusive and transmissive sheet (3) spread on the display unit. Unlike ordinary internally-lit signboards, it is possible to project arbitrary still images and moving images sequentially, and the range of use can be greatly expanded as a multipurpose display system such as signboards, displays, and guide boards. The shape of the signboard is not limited to a flat shape as in the case of the ceiling, but may be a three-dimensional shape having a curved surface, and a clear image can be obtained regardless of the image projection angle or the angle viewed by the observer.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated concretely, this invention is not limited to these.

In the following examples and comparative examples, the following base fabric was used as the woven fabric. The dimensions of the base fabric were all warp (warp direction) 150 cm × weft (weft direction) 150 cm.
(Base fabric 1)
Glass fiber plain woven fabric using melt-drawn filament diameter 9 μm / 750 dtex (na and nb: 1.556) Woven density Warp (warp) 40 / inch Weft (weft) 30 / inch Scouring (heat cleaning)
Silane coupling treatment Methacryloxypropyltrimethoxysilane (Toray Dow Corning Z6030)
(Base fabric 2)
Stretched nylon 333 dtex multifilament (na: 1.578,
Plain weave fabric using nb: 1.522) Density Warp (warp) 40 / inch Weft (weft) 30 / inch (Base fabric 3)
Plain weave fabric using stretched polypropylene 278 dtex multifilament (na: 1.530, nb: 1.496) Density Warp (warp) 40 / inch Weft (weft) 30 / inch (base 4)
Glass fiber plain woven fabric using glass fibers (na and nb: 1.524) having a melt-drawn filament diameter of 9 μm / 750 dtex and a refractive index different from that of the base fabric 1 Density warp (warp) 40 / inch weft (weft) 30 Book / inch Scouring (heat cleaning)
Silane coupling treatment Methacryloxypropyltrimethoxysilane (Toray Dow Corning Z6030)

The optical ceiling model was produced about the industrial material sheet created by the Example and the comparative example, and the following evaluation was performed. The size of the industrial material sheet used for the optical ceiling is 1.5m long x 1.5m wide, and two types of industrial material sheet, flat construction and gentle curved construction, are produced, and 30 watts and 40 types on the back. The four fluorescent lamps were equally arranged. In addition, a liquid crystal video projector (EMP-400W manufactured by Seiko Epson Corporation) was used as a video projector.
<Brightness uniformity of rear projection and visibility from oblique direction>
As shown in Fig. 13 (a), an industrial material sheet (3) 1.5m long by 1.5m wide is installed on the ceiling, and a video projector is placed as a video projection device (4) 1m above it. And projected vertically toward the center of the industrial material sheet. The projected image was observed from below from a position 5 m away from the sheet at an angle perpendicular to the surface of the sheet and at an angle of 15 degrees with respect to the surface, and evaluated according to the following criteria. Next, for curved surface construction as shown in FIG.
Evaluation was performed in the same manner. In addition, in FIG. 13 (a) and (b), the expression of the fluorescent lamp was abbreviate | omitted.
1: There is almost no difference in brightness between the center of the image and the periphery of the image, and even when viewed from a position 5 m away from the vertical direction at an angle of 15 degrees, there is little decrease in luminance and a clear image can be obtained. 2: Clearly there is a difference in brightness between the center of the image and the periphery of the image, and the brightness is lower in the observation from a position 5 m away at an angle of 15 degrees compared to the observation from the vertical direction. There is little difference in brightness at the periphery of the image, and it is 5m at an angle of 15 degrees from the vertical direction.
Although there is no significant difference in brightness when viewed from a distance, the overall brightness and contrast are low and the image is unclear.
When the projection from the video projector placed above the industrial material sheet was observed from below the industrial material sheet, the presence or absence of shadows due to the drawn filament was evaluated as follows.
1: The shadow of the drawn filament is almost invisible. 2: The shadow of the drawn filament hinders the clearness of the image. <Projection screen function>
As shown in Fig. 14, a video projector is arranged as the industrial material sheet (3) and the video projection device (4), and observed from the opposite side to the video projector side (front projection) and the video projector, respectively, from the front and back sides. The function as a projection screen for the projection was evaluated as follows from the viewpoints of image clarity, color development, and brightness.
1: Excellent as a projection screen for projection from the front and back
2: Can be used as a projection screen for projection from the front,
Inappropriate for projection from the rear 3: Inadequate as a projection screen for both front projection and rear projection <Visible light transmittance>
The visible light transmittance of the industrial material sheet was measured according to JISZ 8722 using a spectroscopic color meter CM-3600d (manufactured by Konica Minolta Co., Ltd.).
<Munsell brightness>
Munsell lightness (JIS Z8721) of the flexible resin layer of the industrial material sheet,
Matched to the MUNSELL BOOK OF COLOR standard color swatch.
<Tensile strength>
A strip of warp direction 30 cm and weft direction 3 cm (warp direction sample), warp direction 3 cm and width direction 30 cm strip (weft direction sample) were taken from the industrial material sheet along the yarns of the base fabric and pulled by the JISL1096 strip method. A test was conducted to determine the breaking strength (N / 3 cm).
<Combustion test> (ASTM-E1354: Corn calorimeter test method)
Irradiate 50 kW / m ² of radiant heat from a radiant electric heater onto an industrial material structure for 20 minutes,
In this exothermic test, the total calorific value and rate of heat generation for 20 minutes were measured, and the appearance of the film material after the test was observed.
(A) Total calorific value: 8 MJ / m ² or less was regarded as suitable.
(B) heating speed: 10 seconds or more continuously to the Relevant not exceed 200 kW / ^{m 2.}
(C) Appearance observation: Applicable to those with no pinhole depression exceeding 0.5 mm in diameter.

[Example 1]
Add the black colored vinyl ester resin stirred mixture of the following formulation 2 to the stirred mixture of the soft vinyl chloride resin paste of the following formulation 1 with respect to the mass of the vinyl chloride resin alone and stir to obtain the black colored vinyl ester resin. It was made to disperse | distribute uniformly and the incompatible resin mixture liquid 1 was obtained. The base fabric 1 was immersed in a bath filled with the resin mixture liquid 1, and the base mixture 1 was completely impregnated with the resin mixture liquid 1. Next, the excess resin mixture liquid 1 on both sides of the base cloth 1 was scraped off with a doctor blade, and heated in an electric furnace at 180 ° C. for 5 minutes to obtain a sheet in which both sides of the base cloth 1 were coated with a flexible resin. Next, on one surface of the PET film, the resin mixture liquid 1 is coated with a thickness of 0.12 mm, and this is overlaid on one side of the previously prepared sheet and heated in an electric furnace at 180 ° C. for 5 minutes to obtain the resin mixture liquid 1 After solidifying, the PET film was removed to form a smooth flexible resin layer. When this flexible resin layer was observed with a microscope, the vinyl ester resin constituted a black island component, and the soft vinyl chloride resin constituted a colorless sea component. This sheet had a visible light transmittance of 66% and a refractive index n1 of 1.548.
<Formulation 1>
Emulsion polymerization polyvinyl chloride resin (degree of polymerization 1700) 100 parts by mass tricresyl phosphate (plasticizer) 50 parts by mass cresylphenyl phosphate (plasticizer) 46 parts by mass zinc stearate (stabilizer) 2 parts by mass barium stearate ( Stabilizer) 2 parts by mass

<Formulation 2>
100 parts by mass of vinyl ester resin (trade name: Neopole 8319, manufactured by Nippon Iupika Co., Ltd.)
1 part by weight of curing agent (di- (4-tert-butylcyclohexyl) peroxydicarbonate)
Colorant (aniline black) 1 part by mass The obtained sheet was applied to an optical ceiling for various evaluations. The results are shown in Table 1.

[Example 2]
Add the white colored vinyl ester resin stirred mixture of the following formulation 3 to the stirred mixture of the soft vinyl chloride resin paste of the following formulation 1 with respect to the mass of the vinyl chloride resin alone and stir to obtain the white colored vinyl ester resin. It was made to disperse | distribute uniformly and the incompatible resin mixture liquid 2 was obtained. The base fabric 2 was dipped in a bath filled with the resin mixture liquid 2, and the base mixture 2 was completely impregnated with the resin mixture liquid 2. Next, the excess resin mixture liquid 2 on both surfaces of the base fabric 2 was scraped off with a doctor blade and heated in an electric furnace at 180 ° C. for 5 minutes to obtain a sheet having both surfaces of the base fabric 2 coated with a flexible resin. Next, the resin mixture liquid 1 is coated on one surface of the PET film at a thickness of 0.12 mm, and this is overlaid on one side of the previously prepared sheet and heated in an electric furnace at 180 ° C. for 5 minutes to obtain the resin mixture liquid 2 After solidifying, the PET film was removed to form a smooth flexible resin layer. When this flexible resin layer was observed with a microscope, the vinyl ester resin constituted a white island component and the soft vinyl chloride resin constituted a colorless sea component. This sheet had a visible light transmittance of 65% and a refractive index n1 of 1.548.
<Formulation 3>
100 parts by mass of vinyl ester resin (SSP50-C06 manufactured by Showa Polymer Co., Ltd.)
1 part by weight of curing agent (di- (4-tert-butylcyclohexyl) peroxydicarbonate)
Colorant: Titanium oxide particles (average particle size 0.4 μm) 3 parts by mass
The obtained sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 1.

[Example 3]
An industrial material sheet was prepared in the same manner as in Example 2 except that the base fabric 3 was used. The visible light transmittance of this sheet was 67%, and the refractive index n1 of the cured flexible resin was 1.548. The obtained sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 1.

[Example 4]
The black-colored vinyl ester resin stirring mixture of Formulation 2 in Example 1 was replaced with the black-colored silicone resin of Formulation 4 below, added to 20% by mass with respect to the mass of the vinyl chloride resin alone, and stirred to uniformly distribute the black-colored silicone resin. Dispersed to obtain an incompatible resin mixture liquid 3. The base fabric 4 was immersed in a bath filled with the resin mixture liquid 3, and the base mixture 4 was completely impregnated with the resin mixture liquid 3. Next, the excess resin mixture liquid 3 on both surfaces of the base fabric 4 was scraped off with a doctor blade and heated in an electric furnace at 180 ° C. for 5 minutes to obtain a sheet in which both surfaces of the base fabric 4 were coated with a flexible resin. Next, the resin mixture liquid 3 is coated on one surface of the PET film at a thickness of 0.12 mm, and this is overlaid on one side of the previously prepared sheet and heated in an electric furnace at 180 ° C. for 5 minutes to obtain the resin mixture liquid 3 After solidifying, the PET film was removed to form a smooth flexible resin layer. When the flexible resin layer was observed with a microscope, the silicone resin constituted a black island component, and the soft vinyl chloride resin constituted a colorless sea component. The refractive index n1 of the flexible resin layer was 1.529. Next, a protective layer comprising an additive migration preventing layer and an adhesive / protective layer was sequentially provided on both front and back surfaces, and a photocatalyst layer was further provided on the protective layers on both sides. The additive migration prevention layer was formed by applying a processing liquid comprising the following formulation 5 using a gravure coater, drying at 120 ° C. for 1 minute and then cooling. The adhesive / protective layer was formed by applying a processing liquid having the following composition 6 using a gravure coater, drying at 100 ° C. for 1 minute and then cooling. The photocatalyst layer was formed by applying a processing liquid comprising the following formulation 7 with a gravure coater, drying at 100 ° C. for 1 minute, and then cooling. The resulting additive migration prevention layer was 5 g / m ² , the adhesion / protection layer was 1.5 g / m ² , and the photocatalyst antifouling layer was 1.5 g / m ² . The visible light transmittance of this sheet was 69%.
<Formulation 4>
Trademark: Shirasukon RTV4086A
(2-component addition reaction curable silicone resin: active ingredient 100%: manufactured by Dow Corning Asia)
50 parts by mass Trademark: Shirasukon RTV4086B
(2-component addition reaction curable silicone resin: active ingredient 100%: manufactured by Dow Corning Asia)
50 parts by mass Colorant (carbon black) 1 part by mass <Formulation 5> Additive migration prevention layer composition Vinylidene fluoride-tetrafluoroethylene copolymer resin 20 parts by mass (Trademark: Kainer 7201: Elf Atchem Japan Co., Ltd.) )
MEK (solvent) 80 parts by mass

<Formulation 6> Adhesive / protective layer treatment solution composition Ethanol-ethyl acetate (50/50 mass ratio) solution containing 8 mass% (solid content) of acrylic silicon resin having a silicon content of 3 mol% 100 mass parts Methyl silicate MS51 (Colcoat) 20% ethanol solution (polysiloxane) 8 parts by mass γ-glycidoxypropyltrimethoxysilane (silane coupling agent) 1 part by mass

<Formulation 7> Photocatalyst layer treatment liquid composition Water-ethanol (50/50 mass ratio) solution in which a nitric acid acidic titanium oxide sol corresponding to a titanium oxide content of 10 mass% is dispersed 50 mass parts Corresponding to a silicon oxide content of 10 mass% 50 mass parts of water-ethanol (50/50 mass ratio) solution in which nitric acid acidic silica sol was dispersed was applied to the optical ceiling for various evaluations. The results are shown in Table 1.

[Example 5]
In Example 4, the black colored silicone resin of Formulation 4 was replaced with the black colored silicone resin of Formulation 8 below, and 20% by mass was added to the mass of the vinyl chloride resin alone and stirred to uniformly disperse the black colored silicone resin. A compatible resin mixture liquid 4 was obtained. Other than that was carried out similarly to Example 4, and obtained the industrial material sheet | seat which provided the photocatalyst layer on both surfaces. This sheet had a visible light transmittance of 54% and a refractive index n1 of 1.529. The obtained industrial material sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 1.
<Formulation 8>
Trademark: Shirasukon RTV4086A
(2-component addition reaction curable silicone resin: active ingredient 100%: manufactured by Dow Corning Asia)
50 parts by mass Trademark: Shirasukon RTV4086B
(2-component addition reaction curable silicone resin: active ingredient 100%: manufactured by Dow Corning Asia)
50 parts by mass Colorant: Black pigment obtained by mixing phthalocyanine blue, quinacridone magenta and Hansa Yellow Medium in a 2: 4: 3 mass ratio 1 part by mass

[Example 6]
Add 20% by mass of the black colored vinyl chloride resin stirred mixture of the following formulation 10 to the silicone resin stirred mixture of the following formulation 9 with respect to the mass of the silicone resin alone and stir to uniformly disperse the black colored vinyl chloride resin. A compatible resin mixture liquid 5 was obtained. The base fabric 1 was immersed in a bath filled with the resin mixture liquid 5, and the base mixture 1 was completely impregnated with the resin mixture liquid 5. Next, the excess resin mixture liquid 5 on both surfaces of the base fabric 1 was scraped off with a doctor blade and heated in an electric furnace at 180 ° C. for 10 minutes to obtain a sheet having both surfaces of the base fabric 1 coated with a flexible resin. Next, on one surface of the PET film, the resin mixture liquid 1 is coated with a thickness of 0.12 mm, and this is overlaid on one side of the previously prepared sheet and heated in an electric furnace at 180 ° C. for 10 minutes to obtain the resin mixture liquid 5 After solidifying, the PET film was removed to form a smooth flexible resin layer. When this flexible resin layer was observed with a microscope, the vinyl chloride resin constituted a black island component and the silicone resin constituted a colorless sea component. This sheet had a visible light transmittance of 54% and a refractive index n1 of 1.419.
<Formulation 9>
Trademark: Shirasukon RTV4086A
(2-component addition reaction curable silicone resin: active ingredient 100%: manufactured by Dow Corning Asia)
50 parts by mass Trademark: Shirasukon RTV4086B
(2-component addition reaction curable silicone resin: active ingredient 100%: manufactured by Dow Corning Asia)
50 parts by weight

<Formulation 10>
Emulsion polymerization polyvinyl chloride resin (degree of polymerization 1700) 100 parts by mass tricresyl phosphate (plasticizer) 50 parts by mass cresylphenyl phosphate (plasticizer) 46 parts by mass zinc stearate (stabilizer) 2 parts by mass barium stearate ( Stabilizer) 2 parts by mass
Colorant (aniline black) 1 part by mass The obtained sheet was applied to an optical ceiling for various evaluations. The results are shown in Table 1.

[Example 7]
Add 20% by mass of the hot-melt kneaded product of the black colored polyethylene resin of the following formulation 12 to the hot-melt kneaded product of the soft vinyl chloride resin of the following formulation 11 with respect to the mass of the vinyl chloride resin alone, and heat-melt knead with a Banbury mixer. Then, the black colored polyethylene resin was uniformly dispersed to obtain an incompatible resin mixture 6. This resin mixture 6 was passed through four calendar rolls set at 180 ° C. and molded into a film having a thickness of 0.12 mm. This film was laminated on both surfaces of the base fabric 1 as a flexible resin layer to obtain an industrial material sheet. When this flexible resin layer was observed with a microscope, the polyethylene resin constituted a black island component and the soft vinyl chloride resin constituted a colorless sea component. This sheet had a visible light transmittance of 63% and a refractive index n1 of 1.540.
<Formulation 11>
Polyvinyl chloride resin (degree of polymerization 1300) 100 parts by mass Tricresyl phosphate (plasticizer) 50 parts by mass Cresylphenyl phosphate (plasticizer) 46 parts by mass Zinc stearate (stabilizer) 2 parts by mass Barium stearate (stabilizer) 2 parts by mass

<Formulation 12>
Low-density polyethylene resin (density 0.945) 100 parts by mass Colorant (aniline black) 1 part by mass The obtained sheet was applied to an optical ceiling and subjected to various evaluations. The results are shown in Table 1.

[Example 8]
Add 20% by mass of the hot-melt kneaded product of the white colored vinyl chloride resin of the following formulation 14 to the soft-melted kneaded product of the soft fluorine resin of the following formulation 13 with respect to the mass of the soft fluororesin alone, and heat-melt knead with a Banbury mixer. Then, the white colored vinyl chloride resin was uniformly dispersed to obtain an incompatible resin mixture 7. This resin mixture 7 was passed through four calendar rolls set at 180 ° C. to form a film having a thickness of 0.12 mm. This film was laminated on both surfaces of the base fabric 1 as a flexible resin layer to obtain an industrial material sheet. When this flexible resin layer was observed with a microscope, the vinyl chloride resin constituted a white island component, and the soft fluororesin constituted a colorless sea component. This sheet had a visible light transmittance of 58% and a refractive index n1 of 1.397.
<Formulation 13>
Soft fluororesin (ethylene tetrafluoride-propylene hexafluoride-vinylidene fluoride terpolymer resin)
100 parts by mass

<Formulation 14>
Polyvinyl chloride resin (degree of polymerization 1300) 100 parts by mass Tricresyl phosphate (plasticizer) 50 parts by mass Cresylphenyl phosphate (plasticizer) 46 parts by mass Zinc stearate (stabilizer) 2 parts by mass Barium stearate (stabilizer) 2 parts by mass
Titanium oxide particles (colorant: average particle size 0.4 μm) 3 parts by mass

  The industrial material sheets of Examples 1 to 8 have high visible light transmissivity, have sufficient strength as industrial materials, and the center of the image and the periphery of the image with respect to the projection from the back for both the flat construction and the curved construction There is almost no difference in brightness, and even when viewed from an angle of 15 degrees, a clear image with the same brightness as that observed from the vertical direction but with an excellent contrast-tightening effect can be obtained. When observed, the shade of the drawn filament was hardly visually recognized. In addition, Examples 1, 4, and 5 to 8 were suitable for incombustibility as a result of the combustion test.

[Comparative Example 1]
To the stirring mixture of the soft vinyl chloride resin paste of Formulation 1 of Example 1, 20% by mass of the vinyl ester resin stirring mixture of Formulation 15 shown below is added to the mass of the vinyl chloride resin alone and stirred to uniformly distribute the vinyl ester resin. Dispersed. To this resin mixture liquid, 0.2 part by mass of aniline black as a colorant was added and stirred to obtain a resin mixture liquid 8. The base fabric 1 was immersed in a bath filled with the resin mixture liquid 8, and the base mixture 1 was completely impregnated with the resin mixture liquid 1. Next, the excess resin mixture liquid 1 on both sides of the base cloth 1 was scraped off with a doctor blade, and heated in an electric furnace at 180 ° C. for 5 minutes to obtain a sheet in which both sides of the base cloth 1 were coated with a flexible resin. Next, on one surface of the PET film, the resin mixture liquid 1 is coated with a thickness of 0.12 mm, and this is overlaid on one side of the previously prepared sheet and heated in an electric furnace at 180 ° C. for 5 minutes to obtain the resin mixture liquid 1 After solidifying, the PET film was removed to form a smooth flexible resin layer. When this flexible resin layer was observed with a microscope, the sea component soft vinyl chloride resin and the island component vinyl ester resin were both colored black. This sheet had a visible light transmittance of 63% and a refractive index n1 of 1.548.
<Formulation 15>
100 parts by mass of vinyl ester resin (trade name: Neopole 8319, manufactured by Nippon Iupika Co., Ltd.)
1 part by weight of curing agent (di- (4-tert-butylcyclohexyl) peroxydicarbonate
The obtained sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 2.

[Comparative Example 2]
In Example 1, a sheet was obtained in the same manner as in Example 1 except that the combined use of the mixed mixture of the soft vinyl chloride resin paste of Formulation 1 was omitted. The obtained industrial material sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 2.

[Comparative Example 3]
In Example 1, a sheet was obtained in the same manner as in Example 1 except that the black colorant was omitted from the black colored vinyl ester resin stirring mixture of Formulation 2. The obtained industrial material sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 2.

  The sheet of Comparative Example 1 was unsuitable as a projection screen because the contrast tightening effect was not obtained, and the clarity of the image color due to projection from the back surface was insufficient. Further, since the sheet of Comparative Example 2 lacks the light diffusion effect and is monotonously black as a whole, the sharpness due to the contrast tightening effect of the image by projection from the back surface is insufficient. Moreover, the presence of the projector could be recognized from the opposite side when projecting from the back for both flat construction and curved construction. The sheet of Comparative Example 3 was satisfactory in the light diffusion effect and the level of the presence of the projector on the back was inconspicuous, but the image was in a state of being blurred and blurred and was inappropriate as a projection screen.

  The industrial material sheet capable of rear projection according to the present invention is a light diffusive and transmissive sheet that functions as a projection screen that projects from the front and rear surfaces, and has sufficient strength and durability as an industrial material sheet. Using this, it is possible to build a system that can project back to various industrial material structures such as ceilings, walls, interior lighting signs, domes, tents, sheet shutters, partitions, etc. Since it is excellent in recognizability when viewed and projected onto a curved surface portion, a back projection system with high recognizability to a pedestrian's natural line of sight can be obtained. Industrial material structures that use the industrial material sheet of the present invention, which has particularly non-combustible properties, as ceiling materials, wall materials, interior lighting signage materials, dome materials are high-rise hotels, intelligent buildings, station buildings, airports, station buildings, underground street passages It can be widely used in large commercial facilities, amusement facilities, ceremonial occasions, general hospitals, and various public facilities, and it is also an entertainment for information transmission by projecting digital images and videos together with lighting functions. In the amusement field, it can be expected to be used in various ways such as dramatically improving the production effect. In addition, it is expected to be used as an emergency evacuation guide in the event of a disaster as a quicker example of information provision.

1: Woven fabric 1-a: Stretched filament α
1-b: drawn filament β
2: Flexible resin layer having a sea-island structure
3: Industrial material sheet (light diffusion / transmission sheet)
4: Video projection device 5: Mirror 6: Lighting device 7: Light shielding sheet 8: Housing 9: Underground shopping center 10: Sea component 10-a: Sea component containing colorant 10-b: Sea component not containing colorant 10-c: sea component containing white pigment 11: island component 11-a: island component containing colorant 11-b: island component not containing colorant 11-c: island component containing white pigment a: stretched filament Stretching direction b: Stretching vertical direction of stretched filament Lv: Light incident perpendicularly to the light diffusing and transmitting sheet Ls: Light incident obliquely to the light diffusing and transmitting sheet

Claims (6)

Light diffusibility including a composite base material formed by laminating a flexible resin layer having a sea-island structure in which either a sea component or an island component contains a colorant on one side or more of a woven fabric including a drawn filament In the sheet, the sea-island structure is composed of two types of synthetic resins or two types of synthetic resin immiscible pairs of liquid synthetic resins, and one synthetic resin constituting the synthetic resin incompatible couple is colored in advance. As a colorant-containing synthetic resin, 1) this colorant-containing synthetic resin and the other synthetic resin forming the synthetic resin incompatible pair are melt-mixed or stirred and mixed in a volume ratio of 10: 1 to 10: 7. Or 2) or the colorant-containing synthetic resin and the other synthetic resin forming the synthetic resin incompatible pair by volume ratio 1 : 10 : Non-colored sea component and manufacturing method for the back projection can be industrial materials sheet characterized by forming the sea-island structure by coloring island component by melt mixing or stirring and mixing, in a range of 10.   The method for manufacturing an industrial material sheet capable of rear projection according to claim 1, wherein the island component includes a colorant in the sea-island structure.   The method for producing an industrial material sheet capable of rear projection according to claim 1 or 2, wherein the colorant contains either a white pigment or a black pigment.   The back projection is possible according to claim 1 or 2, wherein the colorant is a mixture of three or more pigments selected from blue (cyan), red (magenta), yellow (yellow), and black (black). Manufacturing method of industrial material sheet. The drawn filament has a drawing direction a and a drawing vertical direction b with respect to the drawing direction a, and the difference between the refractive index n1 of the flexible resin layer and the refractive index na in the drawing direction of the drawn filament. The absolute value | n1-na | satisfies the following formula 1, and the absolute value | n1-nb | of the difference between the refractive index n1 of the flexible resin layer and the refractive index nb in the extending vertical direction b is The method for producing an industrial material sheet capable of rear projection according to any one of claims 1 to 4, wherein the method has an optical characteristic satisfying Equation (2).
0 <| n1-na | ≦ 0.2 Formula 1
| N1-nb | ≦ 0.2 Formula 2 In the light diffusive and permeable sheet, after the start of heating when radiant heat from a radiant electric heater is applied to the light diffusable and permeable sheet in a cone calorimeter test method (ASTM-E1354) at 50 kW / m ^2. The total calorific value for 20 minutes is 8 MJ / m ² or less, and has a non-combustible characteristic that the maximum heat generation rate does not exceed 200 kW / m ² for 20 minutes after heating starts for 10 seconds or more. Item 6. A method for producing an industrial material sheet capable of rear projection according to any one of Items 1 to 5.