JP2010191129A - Industrial material sheet capable of performing rear projection and its projection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a flexible industrial material sheet having a rear projection screen function capable of performing wide-angle display, and to provide a rear projection system using the flexible industrial material sheet. <P>SOLUTION: The industrial material sheet (3) includes a composite base material configured in such a manner that a flexible resin layer (2) is laminated on one surface of a knitted fabric (1) composed of a stretched filament wherein visible light transmittance is 40-90%, and at least one layer of the flexible resin layer includes particles composed of light diffusion materials. The industrial material sheet has such an optical characteristic that the absolute value ¾n1-na¾ of the difference between the refractive index n1 of the flexible resin and the refractive index na in the stretching direction of the stretched filament satisfies the following expression 1: 0.02<¾n1-na¾≤0.07 (expression 1) and the absolute value ¾n1-nb¾ of the difference between the refractive index n1 of the flexible resin layer and the refractive index nb in the stretching (vertical) direction b of the stretched filament satisfies the following expression 2;¾n1-nb¾≤0.07 (expression 2). Furthermore, the rear projection system capable of recognizing a sharp image even in observation from an oblique direction by arranging an image projection device behind the industrial material sheet is provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an industrial material sheet capable of image projection by rear projection and a projection system thereof, and more specifically, a high-rise hotel, an intelligent building, a station building, an airport, a station building, an underground shopping street, a large commercial facility, It is related to non-combustible industrial material sheets used for ceiling members and wall materials, wall signboards and dome-like structure construction materials in amusement facilities, ceremonial occasions, general hospitals, and various public facilities, especially with lighting shade function The present invention relates to a light-transmissive and non-combustible flexible industrial material sheet having a rear-projection screen function that can be displayed in a wide angle and a rear-projection system thereof. .

  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 will be highly prone.

  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, a method of displaying images and moving images by projecting digital data onto a wall surface or a screen has 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 center or a large complex commercial building, and an actual outdoor landscape is projected on the wide-angle video on the underground shopping center. 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. 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-A-2004-77634 JP-A-2005-24942

  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 inventors have intensively studied,
1. In a composite base material formed by laminating a flexible resin layer on one side or more of a woven fabric including stretched filaments, the stretched filaments are stretched in the stretching direction a and in the stretched vertical direction b with respect to the stretching direction a , The absolute value | n1-na | of the difference between the refractive index n1 of the flexible resin and the refractive index na in the drawing direction of the drawn filament satisfies the following formula 1, and the refractive index n1 of the flexible resin: Absolute value of the difference between the refractive index nb in the vertical direction b and the stretching direction | n1-nb |
By making the optical properties satisfy the following formula 2, a highly translucent and highly powerful industrial material sheet that is not affected by the shadow of the woven fabric when viewed from the surface direction can be obtained.
0.02 <| n1-na | ≦ 0.07 Formula 1
| N1-nb | ≦ 0.07 Formula 2
2. At least one of the flexible resin layers includes a white pigment, metal flakes, metal powder,
Light diffusive and transmissive industrial material with sharp projection by including particles made of at least one kind of light diffusing material selected from pearl pigments, glass beads, glass particles, resin beads, and resin particles A sheet is obtained.
3. The light diffusive sheet has a visible light transmittance (JISZ8722) of 40 to 90%, so that the light diffusable sheet has excellent rear projection brightness and also conceals the light source of the video projector. In addition to these,
4. Refractive index n1 of the flexible resin and refractive index na in the drawing direction a of the drawn filament
By making the optical characteristics satisfy the above formula 1, the difference between the luminance at the center of the image and the luminance at the periphery of the image is minimized, and the recognizability of the projected image, especially when viewed from an oblique direction, is dramatically improved. And it can be projected on the curved surface.
As a result, the present invention has been completed.

That is, the industrial material sheet capable of rear projection according to the present invention includes a composite base material formed by laminating a flexible resin layer on one side or more of a woven fabric including a stretched filament, and has a visible light transmittance (JISZ8722) 40. -90% light diffusive and permeable sheet, wherein at least one layer of the flexible resin layer includes particles made of a light diffusing substance, and the drawn filaments are drawn in the drawing direction a and the drawing direction a The absolute value | n1-na | of the difference between the refractive index n1 of the flexible resin and the refractive index na of the drawn filament in the drawing direction satisfies the following formula 1; 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 preferably has an optical characteristic satisfying the following formula 2.
0.02 <| n1-na | ≦ 0.07 Formula 1
| N1-nb | ≦ 0.07 Formula 2
In the industrial material sheet capable of rear projection according to the present invention, the particles made of the light diffusing substance are selected from white pigments, metal flakes, metal powders, pearl pigments, glass beads, glass particles, resin beads, and resin particles. At least one kind is preferred. In the industrial material sheet capable of rear projection according to the present invention, the drawn filament is made of glass fiber or silica fiber, and in the cone calorimeter test method (ASTM-E1354), radiant electric heat is applied to the light diffusive transparent sheet. When radiant heat from a heater is applied at 50 kW / m ² , the total calorific value for 20 minutes after the start of heating is 8 MJ / m ² or less, and for 20 minutes after the start of heating, the maximum heat generation rate continues for 10 seconds or more. It preferably has non-flammable properties that do not exceed 200 kW / m ² .
The rear projection system for an industrial material structure according to the present invention includes a composite base material formed by laminating a flexible resin layer on one side or more of a woven fabric including stretched filaments, and has a visible light transmittance (JISZ8722) of 40. An image projection device is disposed on the back surface of the light diffusive and transparent sheet having ˜90%, at least one of the flexible resin layers includes particles made of a light diffusing substance, and the drawn filament Has a stretching direction a and a stretching vertical direction b with respect to the stretching direction a, and the absolute value | n1 of the difference between the refractive index n1 of the flexible resin and the refractive index na of the stretching filament in the stretching direction −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 satisfies the following formula 2. It preferably has optical properties.
0.02 <| n1-na | ≦ 0.07 Formula 1
| N1-nb | ≦ 0.07 Formula 2
In the rear projection system of the present invention, the particles made of the light diffusing substance are at least one selected from white pigments, metal flakes, metal powders, pearl pigments, glass beads, glass particles, resin beads, and resin particles. It is preferable. In the rear projection system of the present invention, the industrial material structure has a radiation heat of 50 kW / m ² by a radiant electric heater for the light diffusive transparent sheet in a cone calorimeter test method (ASTM-E1354). When irradiated, the total calorific value for 20 minutes after the start of heating is 8 MJ / m ² or less, and the maximum heat generation rate does not exceed 200 kW / m ² for 20 minutes after the start of heating for 10 seconds or more. It is preferably a ceiling, a wall, a dome, or a sign.

  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 The figure which shows the state which observed the image | video projected from the back of the industrial material sheet | seat constructed in the optical ceiling in the Example and the comparative example from the perpendicular direction and the angle of 15 degrees with respect to the surface (a) Plane construction (b) Curved surface Construction The figure which shows the positional relationship of the image projector and observer at the time of evaluating a projection screen function in an Example and a comparative example.

  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. The drawn filament has a drawing direction a as shown in FIG. 1A, and has a drawing vertical direction b with respect to the drawing 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.

  A woven fabric or a knitted fabric is used for the knitted fabric used in the present invention, and examples of the woven fabric include known woven fabrics such as plain weave, twill weave, satin weave and imitation weave. This is preferable because of excellent balance of 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 woven fabric may be subjected to scouring or heat treatment to remove the adhering oil or glue, in order to make it easy to get wet with the flexible resin processing liquid and to improve the adhesion with the flexible fat layer. Corona discharge treatment, plasma discharge treatment, silane coupling agent treatment, and the like may be performed.

In the industrial material sheet of the present invention, as the flexible resin layer, vinyl chloride resin, vinyl chloride copolymer resin, olefin resin, olefin copolymer resin, urethane resin, urethane copolymer resin, acrylic resin, Acrylic copolymer resin, vinyl acetate resin, vinyl acetate copolymer resin, styrene resin, styrene copolymer resin, polyester resin, polyester copolymer resin, fluorine-containing copolymer resin, silicone thermoplastic Thermoplastic resins such as elastomers, silicone resins, silicone rubbers, vinyl ester resins, unsaturated polyester resins, epoxy resins, and the like can also be used. As a method of laminating the flexible resin layer on the woven fabric, for example, a thermoplastic resin solubilized in an organic solvent, a thermoplastic resin emulsion (latex) emulsion-polymerized in water, or a thermoplastic resin is forcibly dispersed in water. Dipping process (double-sided processing on woven fabric) and coating process (fiber) using water dispersion resin such as dispersion resin stabilized, soft polyvinyl chloride resin paste sol, uncured thermosetting resin composition liquid, etc. Examples thereof include single-sided processing or double-sided processing on a fabric. On this flexible resin layer, another flexible resin layer may be laminated, and in particular, a film or sheet formed by a calender molding method or a T-die extrusion method is used via an adhesive or A method of laminating by thermal lamination is exemplified. The basis weight of the flexible resin layer is 30 to 600 g / m ² , and the flexible resin layer includes a portion impregnated with the woven fabric. Here, at least the absolute value | n1−na | of the difference between the refractive index n1 of the flexible resin directly laminated on the woven fabric and the refractive index na of the drawn filament in the drawing direction satisfies the above-mentioned formula 1 and is acceptable. The flexible resin and the drawn filament are appropriately selected so that the absolute value | n1-nb | of the difference between the refractive index n1 of the flexible resin and the refractive index nb in the drawing vertical direction of the drawn filament satisfies the above formula 2. It is preferable.

  Further, at least one layer of the flexible resin layer includes particles made of at least one light diffusing substance selected from white pigment, metal flakes, metal powder, pearl pigment, glass beads, glass particles, resin beads, and resin particles. Is included. The white pigment includes white inorganic particles such as calcium carbonate, magnesium carbonate, barium sulfate, silica, aluminum hydroxide, magnesium hydroxide, and magnesium oxide in addition to white pigments such as titanium dioxide and zinc oxide. Metal flakes and metal powders include aluminum flakes and aluminum powders, as well as flakes and powders in which metals such as aluminum, silver, nickel, tin, and indium are coated on resin or glass flakes and powders by plating. To do. The pearl pigment is exemplified by a pigment obtained by coating natural mica with a metal oxide having a high refractive index. Examples of the glass beads include hollow glass beads and solid glass beads, and examples of the glass particles include glass powder and a broken glass bead. Examples of the resin beads include resin beads made of acrylic resin, silicone resin, polystyrene resin, polyurethane resin, polyethylene resin, benzoguanamine resin, epoxy resin, and the like, and particularly incompatible with the flexible resin layer. Resin is used. In addition, these resin beads may have a core-shell multilayer structure or a crosslinked structure. Resin particles are irregular particles obtained by crushing these resin beads.

  The average particle size of these light diffusing substances is preferably 0.1 to 50 μm, and the aspect ratio of white pigment, metal powder, glass beads, glass particles, resin beads, and resin particles is preferably 1 to 6, particularly The aspect ratio of metal flakes and pearl pigments is preferably 6 to 60. Moreover, the addition amount with respect to a flexible resin layer is 0.1-100 mass parts with respect to 100 mass parts of flexible resins, and 0.1-50 mass parts especially particle | grains which consist of a light diffusable substance are preferable. If the addition amount is less than 0.1 parts by mass, the light diffusibility is insufficient, and the sharpness of the image projected on the back surface is insufficient, or the presence of the light source of the image projection device installed on the back surface is too conspicuous. Further, when the addition amount exceeds 100 parts by mass, the visible light transmittance is lowered, and when used for an optical ceiling, a light wall, an interior lighting signboard, a dome-shaped structure, a sufficient illumination function cannot be exhibited and at the same time In some cases, sufficient brightness may not be obtained even if images are projected from.

  The industrial material sheet of the present invention is a light diffusive transmissive sheet having a visible light transmittance (JISZ8722) 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. The light diffusion / transmission sheet of FIG. 2 uses a plain woven fabric as the knitted fabric (1), and dip processing a resin processing liquid that does not contain particles of the light diffusing material, thereby forming particles of the light diffusing material. A flexible resin layer (2-1) not included may be formed on both sides of the woven fabric, and further coated with a resin processing liquid containing a light diffusing material on one side thereof to include particles made of a light diffusing substance. A flexible resin layer (2-2) is formed. 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. If one of the surfaces of this light diffusive transmissive sheet is projected from the front side, light is diffused by particles made of a light diffusing substance contained in the flexible resin layer, and is clear from the front side. Can project images, and even when viewed from the back and viewed from the front, almost no woven fabric is visible, so there is no shadow due to stretched filaments, and the same clear image as projected from the front is projected can do.

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, as a screen, for example, if a diffusion plate having an isotropic diffusivity simply kneaded with particles made of a light diffusive substance is used, the center of the screen when projected from a video projection device having a wide-angle projection lens is used. When the projection is performed obliquely, the portion near the image projection device is bright and the portion far from the image projection device is dark. In the sheet, such a luminance difference is hardly confirmed, and an image with substantially uniform luminance can be obtained. The reason why such an effect is obtained is not clear, but is presumed as follows.
1. For example, in FIG. 5, assuming a light diffusion / transmission sheet in which the refractive index nb in the drawing vertical direction of the drawn filament is substantially equal to the refractive index n1 of the flexible resin, the vertical direction of the light diffusion / transmission sheet The light (Lv) incident from the flexible resin and the drawn filament α (
1-a) At either the interface between the flexible resin and the drawn filament β (1-b), it is not refracted and diffused because it is incident from the drawing vertical direction of the drawn filament.
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 stretched direction a of the stretched filament is a.
Absolute value of the difference between the refractive index na of the resin and the refractive index n1 of the flexible resin laminated on the woven fabric | n1-
Since na | is more than 0.02 and 0.07 or less, the light is slightly refracted and diffused moderately at the interface between the flexible resin and the drawn filament α, and the luminance increases at the part where the light is incident obliquely. There is.
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.

When one or both of | n1-na | and | n1-nb | exceed 0.07, light diffusion at the interface between the flexible resin and the drawn filament becomes excessive, and the light transmittance of the industrial material sheet is increased. When the projection is performed from the back side, the stretched filament becomes more noticeable, and it may be impossible to view a clear image from the front side of the sheet when projected from the back side of the sheet. If | n1-na | is less than 0.02, 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 projection device, the central portion is bright, When the image becomes dark and the image is projected from an oblique direction, a difference in luminance occurs, for example, a portion close to the image projection device is bright and a distant portion is dark, and the recognizability may be inferior in observation from an oblique direction.

  In the industrial material sheet of the present invention, the light diffusive transparent sheet is a protective resin on one side or both sides for the purpose of preventing scratches on the surface, adhesion of dirt, migration of various additives to the surface, etc. It may 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.

The rear projection system of the present invention includes a composite base material formed by laminating a flexible resin layer on one side or more of a woven fabric including stretched filaments, and has a visible light transmittance (JISZ8722) of 40 to 90%. This is an industrial material structure in which a video projection device is mounted on the back surface of the light diffusive and transparent sheet. At least one layer of the flexible resin layer includes particles made of at least one light diffusing substance selected from white pigments, metal flakes, metal powders, pearl pigments, glass beads, glass particles, resin beads, and resin particles. And the drawn filament has a drawing direction a and a drawing vertical direction b with respect to the drawing direction a, and the absolute difference between the refractive index n1 of the flexible resin and the refractive index na in the drawing direction of the drawn filament The 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 following formula 2. When the image projected from the back side is viewed from the front, the woven fabric contained in the light diffusive and transparent sheet is hardly noticeable, has excellent color reproducibility, and is clear when viewed from an oblique direction. The It is possible to identify the possible projection also in the ceiling and walls having a curved surface portion.
0.02 <| n1-na | ≦ 0.07 Formula 1
| N1-nb | ≦ 0.07 Formula 2
Further, since the light diffusive and permeable sheet is a light diffusible and permeable sheet reinforced with a woven fabric containing stretched filaments, it has sufficient strength and durability as an industrial material structure. In the rear projection system of the present invention, the industrial material sheet (3) is used as a projection screen, and a video projection device (4) is arranged on the rear side thereof, and the image projected from the video projection device is transmitted through the industrial material sheet. And have a configuration to appreciate. 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 the present invention, 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 of the present invention can be applied to uses that require nonflammability as stipulated in the Building Standard Law.

  In the present invention, the video projection device is appropriately 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, or 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 images from a computer 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. It is possible to build a rear projection system that is rich and expressive

  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 light 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 a plurality of observers observe from different positions, the same image is observed from different angles, but the industrial material structure of the present invention projects the angle. 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 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 filament diameter 9μm / 750dtex (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)
Nylon 333 dtex multifilament (na: 1.578, nb: 1.522)
Density Warp (warp) 40 / inch Weft (weft) 30 / inch (Base fabric 3)
Plain woven fabric using 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 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 / 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. Projected vertically toward the center of the industrial material sheet. From the bottom of the projected image,
The observation was made from the 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. Next, the curved surface construction as shown in FIG. 13B was similarly evaluated. 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 luminance at the periphery of the image, and it is 5m at an angle of 15 degrees from the vertical
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,
3. Not suitable for projection from the back 3: Neither front projection nor rear projection can be used as a projection screen <Visible light transmittance>
The visible light transmittance of the industrial material sheet was measured according to JISZ8722 using a spectroscopic color meter CM-3600d (manufactured by Konica Minolta Co., Ltd.).
<Tensile strength>
A strip of 30 cm in the warp direction and 3 cm in the weft direction (a sample in the warp direction), a strip of 3 cm in the warp direction and a sample in the width direction of 30 cm (a sample in the weft direction) are collected from the industrial material sheet along the line of the base fabric. 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]
The thermosetting vinyl ester resin composition of the following formulation 1 was stirred for 20 minutes, and then allowed to stand and degas under reduced pressure to obtain an uncured resin composition liquid 1. In addition, a thermosetting vinyl ester resin composition containing particles composed of a light diffusing substance of the following formulation 2 is stirred for 20 minutes, and then left to degas under reduced pressure to obtain an uncured resin composition liquid 2. It was. The obtained resin composition liquid 1 is placed in a 150 cm × wide 150 cm vat so that the depth is 2 cm, the base cloth 1 is spread and immersed in the resin liquid tank, and left under reduced pressure for 10 minutes. The base fabric 1 was completely impregnated with the resin composition liquid 1. Next, pull out the base fabric 1 from the bat under normal pressure, scrape off the excess resin composition liquid 1 on both sides with a doctor blade, heat cure in an oven purged with nitrogen at 100 ° C. for 30 minutes, by dipping, A sheet in which a flexible resin composed of the following composition 1 was laminated on both surfaces of the base fabric 1 was obtained. Next, prepare a polyester film with a thickness of 50 μm, a length of 150 cm and a width of 150 cm, coat the resin composition liquid 2 on one side with a clearance of 0.2 mm, and be careful not to let air in between. , Superimpose on the previously prepared sheet, heat in a nitrogen-substituted oven at 80 ° C. for 30 minutes, further heat at 100 ° C. for 10 minutes to solidify the resin, peel off the polyester film, and remove from the light diffusing substance A flexible resin layer containing the resulting particles was formed to obtain an industrial material sheet. The refractive index n1 of the cured flexible resin was 1.592, and the absolute value of the difference between the refractive index na and nb of the glass fiber of the base fabric 1 was 0.036 (n1> na = nb).
<Formulation 1> Thermosetting vinyl ester resin composition 100 parts by mass of vinyl ester resin (Nippon Iupika Co., Ltd., trade name: Neopole 8319)
1 part by weight of curing agent (di- (4-tert-butylcyclohexyl) peroxydicarbonate)
<Formulation 2> Thermosetting vinyl ester resin composition containing particles made of a light diffusing substance Vinyl ester resin 100 parts by mass (Nippon Iupika Co., Ltd., trade name: Neopole 8319)
1 part by weight of curing agent (di- (4-tert-butylcyclohexyl) peroxydicarbonate)
Cross-linked polymethyl methacrylate particles (particles made of a light diffusing substance) 20 parts by mass (manufactured by Sekisui Plastics Co., Ltd .: MBX-5: average particle diameter 5 μm: aspect ratio 1.0)
The obtained industrial material sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 1. In addition, since the industrial material sheet of Example 1 has a structural difference between the front and back sides, the side on which the flexible resin layer containing particles made of the light diffusing material of Formulation 2 is laminated is the A side, and the opposite side. When the evaluation was performed on the projected image, the evaluation was performed when the A surface was the front surface and when the B surface was the front surface.

[Example 2]
The thermosetting vinyl ester resin composition of the following formulation 3 was stirred for 20 minutes, and then allowed to stand and defoam under reduced pressure to obtain an uncured resin composition liquid 3. Further, a thermosetting vinyl ester resin composition containing particles composed of a light diffusing substance of the following formulation 4 is stirred for 20 minutes, and then left to degas under reduced pressure to obtain an uncured resin composition liquid 4. It was. The obtained resin composition liquid 3 is placed in a 150 cm × width 150 cm vat so that the depth is 2 cm, and the base fabric 2 is spread and immersed in the resin liquid tank, and left to stand for 10 minutes under reduced pressure. The base fabric 2 was completely impregnated with the resin composition liquid 3. Next, the base fabric 2 is pulled out from the bat under normal pressure, the excess resin composition liquid on both sides is scraped off with a doctor blade, and heated and cured in an oven purged with nitrogen at 100 ° C. for 30 minutes. A sheet in which a flexible resin composed of the following composition 3 was laminated on both surfaces of 2 was obtained. Next, prepare a polyester film having a thickness of 50 μm, a length of 150 cm and a width of 150 cm, and coat the resin composition liquid 4 on one surface with a clearance of 0.2 mm so that air does not enter between them. , Superimpose on the previously prepared sheet, heat in a nitrogen-substituted oven at 80 ° C. for 30 minutes, further heat at 100 ° C. for 10 minutes to solidify the resin, peel off the polyester film, and remove from the light diffusing substance A flexible resin layer containing the resulting particles was formed to obtain an industrial material sheet of the present invention. The refractive index n1 of the cured flexible resin is 1.554, the absolute value of the difference from the refractive index na in the stretching direction of the nylon fiber of the base fabric 2 is 0.024 (n1 <na), The absolute value of the difference from the refractive index nb was 0.032 (n1> nb).
<Formulation 3> Thermosetting vinyl ester resin composition 100 parts by mass of vinyl ester resin (SSP50-C06, Showa Polymer Co., Ltd.)
1 part by weight of curing agent (di- (4-tert-butylcyclohexyl) peroxydicarbonate)
<Formulation 4> Thermosetting vinyl ester resin composition containing particles made of a light diffusing substance Vinyl ester resin 100 parts by mass (SSP50-C06 manufactured by Showa Polymer Co., Ltd.)
1 part by weight of curing agent (di- (4-tert-butylcyclohexyl) peroxydicarbonate)
Titanium oxide particles (particles made of a light diffusing substance) 0.2 parts by mass (average particle size 0.4 μm: amorphous particles having an aspect ratio of 1.0 to 4.0)
The obtained industrial material sheet was applied to the optical ceiling and subjected to various evaluations. The results are shown in Table 1. In addition, since the industrial material sheet of Example 2 has a structural difference between the front and back sides, the side on which the flexible resin layer containing particles made of the light diffusing material of Formulation 4 is laminated is the A side, and the opposite side is the side. When evaluating the projected image with respect to the B surface, the evaluation was performed when the A surface was the front surface and when the B surface was the front surface.

[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 refractive index n1 of the cured flexible resin is 1.554, the absolute value of the difference from the refractive index na in the drawing direction of the polypropylene fiber constituting the base fabric is 0.024 (n1> n21), and the drawing vertical direction The absolute value of the difference from the refractive index nb was 0.058 (n1> n22). The obtained industrial material sheet was applied to the optical ceiling and subjected to various evaluations. The results are shown in Table 1. In addition, since the industrial material sheet of Example 3 has a structural difference between the front and back sides, the side on which the flexible resin layer containing particles made of the light diffusing material of Formulation 4 is laminated is the A side, and the opposite side is the side. When evaluating the projected image with respect to the B surface, the evaluation was performed when the A surface was the front surface and when the B surface was the front surface.

[Example 4]
A soft polyvinyl chloride resin composition of the following formulation 5 was mixed and stirred for 20 minutes, and then allowed to stand for 30 minutes for defoaming to obtain a resin composition liquid 5. Moreover, after mixing and stirring the soft vinyl chloride resin composition containing the particle | grains which consist of a light diffusable substance of the following mixing | blending 6 for 20 minutes, it left still for 30 minutes and defoamed, and the resin composition liquid 6 was obtained. Put the obtained resin composition liquid 5 into a 150 cm × 150 cm wide bat so that the depth is 2 cm, spread the base cloth 4 in the resin liquid tank, immerse it, pull it up and squeeze it with a mangle roll, The base fabric 4 was completely impregnated with the resin composition liquid 5. Subsequently, the sheet | seat which laminated | stacked the flexible resin of the mixing | blending 5 on both surfaces of the base fabric 4 by the dipping process was obtained by heating 160 degreeC * 2 minute (s) in oven, and gelatinizing resin. Next, the resin composition liquid 6 was coated on one surface of the obtained sheet with a clearance of 0.2 mm, heated in an oven at 160 ° C. for 1 minute, and further heated at 180 ° C. for 2 minutes for curing. The refractive index n1 of the flexible resin was 1.548, and the absolute value of the difference between the refractive index na and nb of the glass fiber of the base fabric 4 was 0.024 (n1> na = nb). Next, a protective layer composed of an additive migration preventing layer and an adhesive / protective layer was provided on both the 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 7 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 formulation 8 using a gravure coater, drying at 100 ° C. for 1 minute and then cooling. The photocatalyst layer was formed by applying a processing liquid having the following formulation 9 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 .
<Formulation 5> Soft PVC resin composition Emulsion polymerization polyvinyl chloride resin 100 parts by mass Tricresyl phosphate (plasticizer) 30 parts by mass Cresylphenyl phosphate (plasticizer) 40 parts by mass Zinc stearate (stabilizer) 2 parts by mass Barium stearate (stabilizer) 2 parts by mass <Formulation 6> Soft vinyl resin composition containing particles made of a light diffusing substance Emulsion-polymerized polyvinyl chloride resin 100 parts by mass Tricresyl phosphate (plasticizer) 30 parts by mass Phosphoric acid Cresylphenyl (plasticizer) 40 parts by mass Zinc stearate (stabilizer) 2 parts by mass Barium stearate (stabilizer) 2 parts by mass
Cross-linked polymethyl methacrylate particles (particles made of a light diffusing substance) 30 parts by mass (manufactured by Sekisui Plastics Co., Ltd .: MBX-5: average particle diameter 5 μm: aspect ratio 1.0)
<Formulation 7> Additive migration prevention layer composition Vinylidene fluoride-tetrafluoroethylene copolymer resin 20 parts by mass (Trademark: Kyner 7201: Elf Atchem Japan Co., Ltd.)
MEK (solvent) 80 parts by mass <Formulation 8> Adhesive / protective layer treatment solution composition Ethanol-ethyl acetate (50/50 mass ratio) solution containing 8% by mass (solid content) of an acrylic silicone resin having a silicon content of 3 mol% 100 Part by mass 20% ethanol solution of methyl silicate MS51 (Colcoat Co., Ltd.) (polysiloxane) 8 parts by mass γ-glycidoxypropyltrimethoxysilane (silane coupling agent) 1 part by mass <Formulation 9> 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% by mass is dispersed 50 parts by mass Water in which a nitric acid acidic silica sol corresponding to a silicon oxide content of 10% by mass is dispersed -Ethanol (50/50 mass ratio) solution 50 mass parts of the obtained industrial material sheet was applied to the optical ceiling, each Evaluation was carried out. The results are shown in Table 1. In addition, since the industrial material sheet of Example 4 has a structural difference between the front and back sides, the side on which the flexible resin layer containing particles made of the light diffusing substance of Formulation 6 is laminated is the A side, and the opposite side is the side. When evaluating the projected image with respect to the B surface, the evaluation was performed when the A surface was the front surface and when the B surface was the front surface.

The industrial material sheets of Examples 1 to 4 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 flat construction and curved construction There is almost no difference in brightness, and a clear image with the same brightness as that observed from the vertical direction is obtained even at an angle of 15 degrees, and the shadow of the stretched filament when the image projected from the back is observed from the front Was hardly visible. In addition, Examples 1 and 4 were suitable for nonflammability as a result of the combustion test.

[Example 5]
The resin composition liquid 5 prepared in the same manner as in Example 4 was placed in a 150 cm × wide 150 cm bat so that the depth was 2 cm, and the base cloth 4 was spread and immersed in the resin liquid tank. The base fabric 4 was completely impregnated with the resin composition liquid 5 by pressing with a roll. Subsequently, the sheet | seat which laminated | stacked the flexible resin of the mixing | blending 5 on both surfaces of the base fabric 4 by the dipping process was obtained by heating 160 degreeC * 2 minute (s) in oven, and gelatinizing resin. Next, the resin composition liquid 5 was coated on one surface of the sheet with a clearance of 0.1 mm, and the resin composition liquid 6 prepared in the same manner as in Example 4 was coated on the other surface with a clearance of 0.1 mm. And then heated in an oven at 160 ° C. for 1 minute, and further heated at 180 ° C. for 2 minutes for curing. The refractive index n1 of the flexible resin was 1.548, and the absolute value of the difference between the refractive index na and nb of the glass fiber of the base fabric 4 was 0.024 (n1> n21 = n22). Furthermore, a protective layer was formed on the flexible resin layers on both the front and back surfaces to obtain the industrial material sheet of the present invention. The protective layer was formed by applying a solvent dilution of an acrylic resin composition having the following composition 10 using a gravure coater and drying at 120 ° C. for 1 minute. The obtained protective layer was 5 g / m ² on both the front and back surfaces.
<Formulation 10> Acrylic resin composition Acrylic resin 20 parts by mass (Mitsubishi Rayon Co., Ltd .: Acryprene pellet HBS001)
Dilution solvent (toluene-MEK 50:50 mass ratio) 80 mass parts The obtained industrial material sheet was applied to the optical ceiling, and various evaluations were performed. The results are shown in Table 1. In addition, since the industrial material sheet of Example 5 has a structural difference between the front and back sides, the side on which the flexible resin layer containing particles made of the light diffusing material of Formulation 6 is laminated is the A side, and the opposite side is the side. When evaluating the projected image with respect to the B surface, the evaluation was performed when the A surface was the front surface and when the B surface was the front surface.

[Example 6]
A particle-containing soft polyvinyl chloride resin composition composed of a light diffusing substance of the following formulation 11 was mixed and stirred for 20 minutes, and then allowed to stand for 30 minutes for defoaming to obtain a resin composition liquid 11. The obtained resin composition liquid 11 is placed in a 150 cm × wide 150 cm vat so that the depth is 2 cm, the base fabric 2 is spread and immersed in the resin liquid tank, and simultaneously lifted and compressed with a mangle roll, The base fabric 2 was completely impregnated with the resin composition liquid 11. Next, the sheet was heated in an oven at 160 ° C. for 2 minutes, further heated at 180 ° C. for 2 minutes, and cured to obtain a sheet in which the flexible resin of Formula 11 was laminated on both surfaces of the base fabric 2 by dipping. The refractive index n1 of the flexible resin is 1.520, the absolute value of the difference from the refractive index na in the stretching direction of the nylon fiber of the base fabric 2 is 0.058 (n1 <na), and the refractive index nb in the stretching vertical direction The absolute value of the difference was 0.002 (n1 <nb). Furthermore, a protective layer was formed on the flexible resin layers on both the front and back surfaces to obtain the industrial material sheet of the present invention. As in Example 5, the protective layer was formed by applying a solvent diluted solution of the acrylic resin composition of Formulation 10 using a gravure coater and drying at 120 ° C. for 1 minute. The obtained protective layer was 5 g / m ² on both the front and back surfaces.
<Formulation 11> Soft PVC resin composition containing particles made of light diffusing substance Emulsion-polymerized polyvinyl chloride resin 100 parts by mass Tricresyl phosphate (plasticizer) 100 parts by mass Di-2-ethylhexyl phthalate (plasticizer) 120 Mass parts Zinc stearate (stabilizer) 2 parts by mass Barium stearate (stabilizer) 2 parts by mass Cross-linked polymethyl methacrylate particles (particles made of a light diffusing substance) 50 parts by mass (manufactured by Sekisui Plastics Co., Ltd.) MBX-5: average particle diameter 5 μm: aspect ratio 1.0)
The obtained industrial material sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 1. In addition, since the industrial material sheet of Example 6 has no structural difference between the front and back, when evaluating the projected image, the evaluation is performed with one side as the front without distinguishing between the A side and the B side. went.

[Example 7]
The thermosetting vinyl ester resin composition containing particles composed of the light diffusing substance of Formulation 2 was stirred for 20 minutes, and then allowed to stand and degas under reduced pressure to obtain an uncured resin composition liquid 2. The obtained resin composition liquid 2 is placed in a 150 cm × wide 150 cm vat so that the depth is 2 cm, and the base cloth 1 is spread and immersed in the resin liquid tank, and left to stand for 10 minutes under reduced pressure. The base fabric 1 was completely impregnated with the resin composition liquid 2. Next, pull out the base fabric 1 from the bat under normal pressure, scrape off the excess resin composition liquid 2 on both sides with a doctor blade, heat cure in an oven purged with nitrogen at 100 ° C. for 30 minutes, by dipping, An industrial material sheet of the present invention was obtained in which a flexible resin composed of Formulation 2 was laminated on both surfaces of the base fabric 1. The refractive index n1 of the cured flexible resin was 1.592, and the absolute value of the difference between the refractive index na and nb of the glass fiber of the base fabric 1 was 0.036 (n1> na = nb). The obtained sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 1. In addition, since the industrial material sheet of Example 7 has no structural difference between the front and back, when evaluating the projected image, the evaluation is performed with one side as the front without distinguishing between the A side and the B side. went.

The industrial material sheets of Examples 5 to 7 have high visible light transmissivity, have sufficient strength as industrial materials, and have a central portion of the image and a peripheral portion of the image with respect to the projection from the back for both planar construction and curved construction. There is almost no difference in brightness, and a clear image with the same brightness as that observed from the vertical direction is obtained even at an angle of 15 degrees, and the shadow of the stretched filament when the image projected from the back is observed from the front Was hardly visible. In addition, Examples 5 and 7 were suitable for incombustibility as a result of the combustion test.

[Comparative Example 1]
An industrial material sheet was prepared in the same manner as in Example 2 except that the base fabric 1 was used. The refractive index n1 of the flexible resin layer was 1.554, and the absolute value of the difference between the refractive index na and nb of the glass fiber of the base fabric 1 was 0.002 (n1 <na = nb). The obtained industrial material sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 2. In addition, since the industrial material sheet of Comparative Example 1 has a structural difference between the front and back sides, the side on which the flexible resin layer containing particles made of the light diffusing substance of Formulation 2 is laminated is the A side, and the opposite side is the side. When evaluating the projected image with respect to the B surface, the evaluation was performed when the A surface was the front surface and when the B surface was the front surface.

[Comparative Example 2]
An industrial material sheet was prepared in the same manner as in Example 6 except that the base fabric 4 was used. The refractive index n1 of the flexible resin layer was 1.520, and the absolute value of the difference between the refractive index na and nb of the glass fiber of the base fabric 4 was 0.004 (n1 <na = nb). The obtained industrial material sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 2. In addition, since the industrial material sheet of Comparative Example 2 has no structural difference between the front and back sides, when evaluating the projected image, the evaluation is performed with one side as the front without distinguishing between the A side and the B side. went.

In the industrial material sheets of Comparative Examples 1 and 2, | n1-na | is less than 0.02, and both the flat construction and the curved construction are moderate at the interface between the stretched filament and the flexible resin. Light diffusion could not be obtained, the luminance at the periphery of the image was slightly darker than the luminance at the center of the image, and the image observed from an oblique angle of 15 degrees was low in brightness and was unclear with no contrast.

[Comparative Example 3]
The resin composition liquid 3 of Formulation 3 prepared in the same manner as in Example 2 was placed in a 150 cm × width 150 cm vat to a depth of 2 cm, the base fabric 1 was spread and immersed in the resin liquid tank, and the pressure was reduced. The base fabric 1 was completely impregnated with the resin composition liquid 3 by being left still for 10 minutes. Next, the base fabric 1 is pulled out from the bat under normal pressure, the excess resin composition liquid on both sides is scraped off with a doctor blade, and heated and cured in an oven purged with nitrogen at 100 ° C. for 30 minutes. A sheet in which a flexible resin composed of Formulation 3 was laminated on both sides of 1 was obtained. Next, prepare a polyester film having a thickness of 50 μm, a length of 150 cm and a width of 150 cm, and coat the resin composition liquid 3 on one surface with a clearance of 0.2 mm so that air does not enter between them. , Superimpose on the previously prepared sheet, heat in a nitrogen-substituted oven at 80 ° C. for 30 minutes, further heat at 100 ° C. for 10 minutes to solidify the resin, peel off the polyester film, and remove from the light diffusing substance A flexible resin layer containing no particles was formed to obtain an industrial material sheet. The refractive index n1 of the cured flexible resin was 1.554, and the absolute value of the difference between the refractive index na and nb of the glass fiber of the base fabric 1 was 0.002 (n1 <na = nb). The obtained industrial material sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 2. In addition, since the industrial material sheet of Comparative Example 3 has a structural difference between the front and back sides, the side on which the flexible resin layer not containing particles of the light diffusing substance of Formulation 3 is further laminated after dipping is the A side, When the opposite surface was the B surface and the evaluation on the projected image was performed, the evaluation was performed for each of the cases where the A surface was the front surface and the B surface was the front surface.

  Since the industrial material sheet of Comparative Example 3 has | n1-na | of less than 0.02 and does not contain particles made of a light diffusing substance, there is almost no light diffusion on the sheet, and projection from the front and back sides is possible. On the other hand, it was a sheet that could hardly be used as a projection screen with almost no video. In particular, since the light transmittance is high and the transparency is high, the video projector can be clearly seen from the opposite side when projected from the back for both flat construction and curved construction, and the sheet cannot be used as a lighting cover.

[Comparative Example 4]
The silicone rubber composition of the following formulation 12 was stirred for 20 minutes, and then allowed to stand and degas under reduced pressure to obtain an uncured resin composition liquid 12. Moreover, the silicone rubber composition containing the particle | grains which consist of a light diffusable substance of the following mixing | blending 13 was stirred for 20 minutes, and it left still and deaerated under reduced pressure after that, and the uncured resin composition liquid 13 was obtained. The obtained resin composition liquid 12 is placed in a 150 cm × width 150 cm vat so that the depth is 2 cm, and the base cloth 4 is spread and immersed in the resin liquid tank, and left to stand for 10 minutes under reduced pressure. The base fabric 4 was completely impregnated with the resin composition liquid 12. Next, the base cloth 4 was pulled out from the bat under normal pressure, and the excess resin composition liquid on both sides was scraped off with a doctor blade to obtain a sheet in which the uncured flexible resin 12 was coated on both sides of the base cloth 4. Next, prepare a polyester film having a thickness of 50 μm, a length of 150 cm and a width of 150 cm, and coat the resin composition liquid 13 on one surface thereof with a clearance of 0.2 mm so that air does not enter between them. , Superposed on the previously prepared sheet, heated in an oven at 80 ° C. for 30 minutes, further heated at 100 ° C. for 10 minutes to solidify the resin and then peel off the polyester film and contain particles made of a light diffusing substance A flexible resin layer was formed to obtain an industrial material sheet. The refractive index n1 of the cured flexible resin was 1.401, and the absolute value of the difference between the refractive index na and nb of the glass fiber of the base fabric 4 was 0.123 (n1 <na = nb).
<Formulation 12> Silicone rubber composition CY52-110 (silicone rubber manufactured by Toray Dow Corning Silicone Co., Ltd.)
Liquid A 50 parts by mass Liquid B 50 parts by mass <Formulation 13> Silicone rubber composition CY52-110 (silicone rubber manufactured by Toray Dow Corning Silicone Co., Ltd.) containing particles made of a light diffusing substance
Liquid A 50 parts by mass Liquid B 50 parts by mass Cross-linked polystyrene resin particles 50 parts by mass (Sekisui Plastics Co., Ltd .: SBX-6: average particle diameter 6 μm: aspect ratio 1.0)
The obtained sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 2. In addition, since the industrial material sheet of Comparative Example 4 has a structural difference between the front and back sides, the side on which the flexible resin layer containing particles made of the light diffusing material of Formulation 13 is laminated is the A side, and the opposite side. When the evaluation was performed on the projected image, the evaluation was performed when the A surface was the front surface and when the B surface was the front surface.

  The industrial material sheet of Comparative Example 4 shows that there is no difference in brightness between the image peripheral part and the image center part when the projection from the back is observed from the front for both flat construction and curved surface construction. The brightness was similar to that observed, but the difference in the refractive index between the stretched filament and the flexible resin was large, the diffusion of light at the interface was excessive, and the shadow of the stretched filament was visually recognized. The clearness of the image was hindered, and the sheet was unsuitable as a rear projection screen.

[Comparative Example 5]
A polyester film having a thickness of 50 μm, a length of 150 cm and a width of 150 cm is prepared, and a resin composition solution 5 of Formulation 5 prepared in the same manner as in Example 4 is coated on one surface thereof with a clearance of 0.22 mm, and then in the oven. And gelled by heating at 160 ° C. for 1 minute. Next, the resin composition liquid 6 of the formulation 6 prepared in the same manner as in Example 4 was coated on the gelled composition of the formulation 5 with a clearance of 0.22 mm, and heated in an oven at 160 ° C. for 1 minute. Further, the sheet was heated at 180 ° C. for 2 minutes and cured to obtain a sheet containing no woven fabric. Furthermore, the additive migration preventing layer composition, the adhesion / protection layer, and the photocatalyst layer were formed on both sides in the same manner as in Example 4. The obtained sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 2. In addition, since the sheet of Comparative Example 5 has a structural difference between the front and back sides, the side on which the flexible resin layer containing particles made of the light diffusing material of Formulation 6 is laminated is the A side, and the opposite side is B. When evaluating the projected image, the evaluation was made for each of the cases where the A-side was the front and the B-side was the front.

  The sheet of Comparative Example 5 does not include a knitted fabric for projection from the back for both flat construction and curved construction, so that appropriate light diffusion at the interface between the stretched filament and the flexible resin cannot be obtained. The brightness is slightly darker than the brightness at the center of the image. In addition, the image observed from an oblique angle of 15 degrees was a low-brightness, unclear image with no contrast. Furthermore, since it is not reinforced by the knitted fabric, the strength is insufficient for use as an industrial material sheet.

[Comparative Example 6]
The resin composition liquid 1 of Formulation 1 prepared in the same manner as in Example 1 was placed in a 150 cm × width 150 cm vat to a depth of 2 cm, the base fabric 1 was spread and immersed in the resin liquid tank, and the pressure was reduced. The base fabric 1 was completely impregnated with the resin composition liquid 1 by being left still for 10 minutes. Next, the base fabric 1 is pulled out from the bat under normal pressure, the excess resin composition liquid on both sides is scraped off with a doctor blade, and heated and cured in an oven purged with nitrogen at 100 ° C. for 30 minutes. A sheet obtained by laminating a flexible resin composed of Formulation 1 on both surfaces of the cloth 1 was obtained. Next, a polyester film having a thickness of 50 μm, a length of 150 cm and a width of 150 cm is prepared, and the resin composition liquid 1 is coated on one surface thereof with a clearance of 0.2 mm. Superimpose on the prepared sheet, heat in a nitrogen-substituted oven at 80 ° C for 30 minutes, further heat at 100 ° C for 10 minutes to solidify the resin, peel off the polyester film, and diffuse light into the flexible resin layer The industrial material sheet which does not contain the particle | grains which consist of a property substance was obtained. The refractive index n1 of the cured flexible resin was 1.592, and the absolute value of the difference between the refractive index na and nb of the glass fiber of the base fabric 1 was 0.036 (n1> na = nb). The obtained sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 2. In addition, since the industrial material sheet of Comparative Example 6 has a structural difference between the front and back sides, the side on which the flexible resin layer not containing particles of the light diffusing material of Formulation 1 is further laminated after the dipping is the A side, When the opposite surface was the B surface and the evaluation on the projected image was performed, the evaluation was performed for each of the cases where the A surface was the front surface and the B surface was the front surface.

  Although the industrial material sheet of Comparative Example 6 has light diffusion at the interface between the drawn filament and the flexible resin, it does not have a flexible resin layer containing particles made of a light diffusing substance, and from the front and back surfaces. In all of these projections, it was possible to display only unclear images with low contrast, and the sheet could not be used as a projection screen.

[Comparative Example 7]
A soft PVC resin composition containing particles made of a light diffusing substance of the following composition 14 instead of the composition 5, and a soft PVC resin composition containing particles made of a light diffusing substance of the following composition 15 instead of the composition 6. Were used in the same manner as in Example 4 except that each was used. The refractive index n1 of the flexible resin was 1.548, and the absolute value of the difference between the refractive index na and nb of the glass fiber of the base fabric 4 was 0.024 (n1> n21 = n22).
<Formulation 14> Soft PVC resin composition containing particles made of light diffusing substance Emulsion-polymerized polyvinyl chloride resin 100 parts by mass Tricresyl phosphate (plasticizer) 30 parts by mass Cresylphenyl phosphate (plasticizer) 40 parts by mass Zinc stearate (stabilizer) 2 parts by mass Barium stearate (stabilizer) 2 parts by mass Titanium oxide particles (particles made of a light diffusing substance) 2 parts by mass (average particle size 0.4 μm: aspect ratio 1.0 to 4) 0.0 irregularly shaped particles)
<Formulation 15> Soft PVC resin composition containing particles made of light diffusing substance Emulsion-polymerized polyvinyl chloride resin 100 parts by mass Tricresyl phosphate (plasticizer) 30 parts by mass Cresylphenyl phosphate (plasticizer) 40 parts by mass Zinc stearate (stabilizer) 2 parts by weight Barium stearate (stabilizer) 2 parts by weight
Cross-linked polymethyl methacrylate particles (particles made of a light diffusing substance) 120 parts by mass (manufactured by Sekisui Plastics Co., Ltd .: MBX-5: average particle diameter 5 μm: aspect ratio 1.0)
The obtained industrial material sheet was applied to the optical ceiling for various evaluations. The results are shown in Table 2. In addition, since the industrial material sheet of Comparative Example 7 has a structural difference between the front and back sides, the side on which the flexible resin layer containing particles made of the light diffusing material of Formulation 15 is laminated is the A side, and the opposite side. When the evaluation was performed on the projected image, the evaluation was performed when the A surface was the front surface and when the B surface was the front surface.

The industrial material sheet of Comparative Example 7 can project a clear image for the projection from the front, but the visible light transmittance is low, so it is unclear for the projection from the back for both flat construction and curved construction. In this case, only dark images can be projected, and the sheet is not suitable for use as a rear 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 2-1: Flexible resin layer not containing particles made of light diffusing substance 2-2: Flexible resin layer containing particles made of light diffusing substance 3: Industrial material sheet ( Light diffusion and transmission sheet)
4: Video projection device 5: Mirror 6: Lighting device 7: Light-shielding sheet 8: Housing 9: Store in underground shopping center a: Stretching direction of stretched filament b: Stretching vertical direction of stretched filament Lv: Incident perpendicular to light diffusion transmission sheet Light Ls: light obliquely incident on the light diffusion transmission sheet

Claims (9)

A light diffusive transparent sheet having a visible light transmittance (JIS Z8722) of 40 to 90%, comprising a composite base material formed by laminating a flexible resin layer on one side or more of a woven fabric comprising stretched filaments, At least one layer of the flexible resin layer includes particles made of a light diffusing substance, and the stretched filament has a stretching direction a and a stretching vertical direction b with respect to the stretching direction a, and The absolute value | n1-na | of the difference between the refractive index n1 of the flexible resin and the refractive index na in the drawing direction of the drawn filament satisfies the following formula 1, and the refractive index n1 of the flexible resin layer: An industrial material sheet capable of rear projection, wherein the absolute value | n1-nb | of the difference from the refractive index nb in the stretched vertical direction b has optical characteristics satisfying the following formula 2.
0.02 <| n1-na | ≦ 0.07 Formula 1
| N1-nb | ≦ 0.07 Formula 2   2. The rear projection according to claim 1, wherein the particles made of the light diffusing substance are at least one selected from white pigments, metal flakes, metal powders, pearl pigments, glass beads, glass particles, resin beads, and resin particles. Possible industrial material sheet. 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 3. An industrial material sheet capable of rear projection according to item 1 or 2. On the back side of a light diffusive transparent sheet having a visible light transmittance (JISZ8722) of 40 to 90%, including a composite base material obtained by laminating a flexible resin layer on one side or more of a woven fabric comprising stretched filaments , An industrial material structure in which a video projection device is disposed, wherein at least one of the flexible resin layers includes particles made of a light diffusing substance, and the drawn filament has a drawing direction a, and The absolute value | n1-na | of the difference between the refractive index n1 of the flexible resin and the refractive index na of the drawing filament in the drawing direction is expressed by 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 stretched vertical direction b has optical characteristics satisfying the following formula 2. The back of the industrial material structure Copy system.
0.02 <| n1-na | ≦ 0.07 Formula 1
| N1-nb | ≦ 0.07 Formula 2   5. The rear projection according to claim 4, wherein the particles made of the light diffusing substance are at least one selected from white pigments, metal flakes, metal powders, pearl pigments, glass beads, glass particles, resin beads, and resin particles. system. When the industrial material structure is irradiated with radiant heat by a radiant electric heater at 50 kW / m ² on the light diffusive and permeable sheet in the cone calorimeter test method (ASTM-E1354), 20 starts after heating is started. The ceiling having a non-flammable property, wherein the total calorific value per minute is 8 MJ / m ² or less and the maximum exothermic rate does not exceed 200 kW / m ² for 20 minutes after the start of heating for 10 seconds or more. 5. A rear projection system according to 5. When the industrial material structure is irradiated with radiant heat by a radiant electric heater at 50 kW / m ² on the light diffusive and permeable sheet in the cone calorimeter test method (ASTM-E1354), 20 starts after heating is started. The wall having a non-flammable property, wherein the total calorific value per minute is 8 MJ / m ² or less and the maximum exothermic rate does not exceed 200 kW / m ² for 20 minutes after the start of heating for 10 seconds or more. 5. A rear projection system according to 5. When the industrial material structure is irradiated with radiant heat by a radiant electric heater at 50 kW / m ² on the light diffusive and permeable sheet in the cone calorimeter test method (ASTM-E1354), 20 starts after heating is started. The dome having a non-flammable property, wherein the total heat generation amount per minute is 8 MJ / m ² or less and the maximum heat generation rate does not exceed 200 kW / m ² for 20 minutes after the start of heating for 10 seconds or more. 5. A rear projection system according to 5. When the industrial material structure is irradiated with radiant heat by a radiant electric heater at 50 kW / m ² on the light diffusive and permeable sheet in the cone calorimeter test method (ASTM-E1354), 20 starts after heating is started. The signboard having a non-flammable property, wherein the total calorific value per minute is 8 MJ / m ² or less and the maximum exothermic rate does not exceed 200 kW / m ² for 20 minutes after the start of heating for 10 seconds or more. 5. A rear projection system according to 5.