JP2007219534A - Diffusion/reflection type screen and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a diffusion/reflection type screen made of a cloth and a method for manufacturing the screen that can be easily and inexpensively manufactured while preventing curling. <P>SOLUTION: The diffusion/reflection type screen is manufactured by separately weaving a crepe weave surface cloth and a both-side satin weave lining by using a multifilament thread (for instance, 84 d tex/72 or 36 filaments) of polyethylene terephthalate and then just laminating with an adhesive. The obtained screen does not include a resin layer except for the adhesive. The surface cloth as a diffusion/reflection layer is woven into a thickness of, for instance, 150 to 200 μm by the density of about 100 threads/inch by using a thread in which titanium oxide, a white pigment or a fluorescent dye is mixed, and shows a surface roughness (SMD) by a KES (Kawabata's evaluation system) method of, for instance, 0.4 to 0.5 μm. The light shielding layer of the lining is woven into a thickness of, for instance, 300 to 400 μm by using a black source thread, by the warp density of about 300 threads/inch and the warp density of about 100 threads/inch. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a reflective screen for projecting an image projected from a projector such as a projector, a slide, or an overhead projector as reflected light, and more particularly to a diffuse reflective screen that diffuses reflected light in all directions.

  Reflective screens for projection have (1) diffuse reflection type close to perfect diffusion, (2) retroreflective type reflecting in the same direction as incident light, and (3) opposite direction to incident light, depending on the characteristics of the reflecting surface. It is divided into the regular reflection type that reflects light. These generally have a structure in which a white vinyl chloride resin sheet is laminated on one side of a dimensionally stable base sheet made of glass fiber or the like, and a dark vinyl chloride resin sheet is laminated on the other side, Provide fine irregularities on the surface of the white vinyl chloride resin sheet (diffuse reflection type), arrange glass beads (regression reflection type), apply pearl pigment (regular reflection type), and combine these Thus, the reflection angle is adjusted.

  The diffuse reflection type screen diffuses reflected light in all directions, so it has a wide viewing angle, excellent image uniformity, and natural color reproducibility. There is a problem that the image cannot be clearly seen unless the image is darkened.

  Since conventional projectors did not provide sufficient output, a high-brightness type screen was required even at the expense of viewing angle. For this reason, a retro-reflective screen or a regular reflection with increased reflection brightness by concentrating the reflected light. Development of mold screens was mainstream. However, in recent years, as the development of projectors has progressed and projectors with abundant light intensity and sufficient brightness have been manufactured, diffuse reflection type screens that can see natural images with a wide viewing angle are reviewed. It became so.

  As described above, some of the conventional diffuse reflection type screen members are made of vinyl chloride resin (for example, Patent Document 1), and toxicity is a problem at the time of disposal. In particular, harmful dioxins are generated at the time of low-temperature incineration disposal. It has a serious drawback of occurring. For this reason, the development of screens using materials that do not use vinyl chloride resin has been eagerly desired for the purpose of environmental conservation from the global environmental scale. Moreover, in order to improve the diffusibility of a vinyl chloride resin sheet, the process of providing an unevenness | corrugation by embossing etc. was required and there also existed a problem that a manufacturing process was complicated.

On the other hand, a diffuse reflection type screen made of polyester special woven fabric (a double woven fabric in which the texture on the front side of the reflective surface is satin weave and the texture on the back side is satin weave) is commercially available. However, because of the woven structure, there is a drawback that light from the back surface is transmitted and the image quality is impaired. In order to solve this problem, the polyester special woven fabric having a resin processing for shading on the back surface is also commercially available. However, there is a problem in that curling (curled deformation) is likely to occur because shrinkage occurs due to processing stress and fluctuations in the outside air temperature, and the shrinkage rate differs between the polyester special fabric and the resin layer.
JP-A-5-45735

  The present invention has been made in view of such a current situation, and an object of the present invention is to provide curling in a diffuse reflection type screen having a configuration in which a cloth is used instead of a vinyl chloride resin sheet that may cause environmental pollution. It is an object of the present invention to provide a diffuse reflection type screen that does not occur and a manufacturing method thereof.

  The diffuse reflection type screen of the present invention is a diffuse reflection type screen made of a cloth, comprising a diffuse reflection layer made of cloth and having random fine irregularities formed on the surface by weaving or knitting itself, and at least one piece of cloth. Adhering the light-shielding layer, the diffusive reflection layer, and the light-shielding layer to each other by suppressing the adverse effect on image quality due to stray light from the back by realizing a light-shielding rate of 90.0% or more by itself It consists of an agent layer.

  The diffuse reflection layer is formed substantially only from the fabric, and a sufficient light-shielding property is imparted by the light-shielding layer consisting essentially of the fabric. In addition, as the light-shielding layer made of a fabric, a fabric that is substantially free from contraction due to variations in processing stress and outside air temperature is employed. If it occurs, it shrinks at substantially the same shrinkage rate as the fabric forming the diffuse reflection layer, and has dimensional stability with respect to the diffuse reflection layer.

  Furthermore, such a diffuse reflection layer and a light shielding layer are bonded together with an adhesive layer therebetween, and no other resin layer is laminated.

  Therefore, a curling rate of 10% or less can be easily realized. Moreover, compared with the case where special textiles are manufactured, it can manufacture remarkably easily and cheaply.

  The surface roughness (SMD) of the diffuse reflection layer is preferably 0.1 to 2.0 micron (reading value of surface roughness tester by KES method (KES-FB evaluation system) described later). The light shielding rate realized by the fabric itself forming the light shielding layer is preferably 95.0% or more.

  The diffuse reflection layer is preferably a satin texture knitted fabric (that is, a satin fabric or a satin knitted fabric) using a multifilament yarn kneaded with titanium oxide, a white pigment, or a fluorescent dye. On the other hand, the light shielding layer is preferably a woven or knitted fabric having a double-faced satin structure using a multifilament yarn of black original (that is, a double-faced satin woven fabric or a double-faced satin knitted fabric). By using these knitted and knitted fabrics, necessary diffuse reflection performance and light shielding properties, and dimensional stability between them can be easily realized.

  In the production of the diffuse reflection type screen of the present invention, the diffuse reflection layer and the light shielding layer are produced and then bonded together with an adhesive. The adhesive for bonding is not limited to a specific type.

  In the diffuse reflection type screen of the present invention, the resin layer is not laminated on any surface, and the structure of the outer surface forming the diffuse reflection layer and the structure of the lining forming the light shielding layer are bonded with an adhesive. Therefore, curling can be prevented while producing easily and inexpensively.

  The diffuse reflection type screen of the present invention comprises a fabric in which random fine irregularities are formed on the fabric surface by weaving (weaving or knitting) as a diffuse reflection layer. The term “fabric” is not limited to a woven fabric, but is used to mean a fiber sheet body including a knitted fabric and a non-woven fabric.

  In the present invention, it is important that the fine unevenness formed on the surface of the fabric is random, thereby obtaining diffusibility, and moire (interference fringes due to synchronization of the period of the projector pixel and the period of the fine unevenness). The occurrence is prevented. In the present invention, such fine irregularities are formed by weaving. The weaving structure and the knitting structure are not particularly limited, and among them, the satin texture (the satin weaving or the satin weaving) is excellent in the randomness of the fine unevenness and is preferably used in the present invention.

  The surface roughness (SMD) of the fabric is preferably 0.1 to 2.0 microns (μm), more preferably 0.3 to 1.0 microns in both the vertical and horizontal directions. When the surface roughness is less than 0.1 micron, it is not preferable because the diffusibility becomes insufficient when an image is projected on a diffuse reflection type screen using the surface roughness. On the other hand, when the surface roughness exceeds 2.0 microns, it is not preferable because the image lacks sharpness when projected on a diffuse reflection type screen using the surface roughness.

  Although the fiber raw material which comprises a fabric is not specifically limited, It is preferable that it is a chemical fiber because it is excellent in wrinkle resistance, light resistance, and heat resistance. Chemical fibers include polyamide (nylon 6, nylon 66, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, etc.), polyolefin (polyethylene, polypropylene, etc.), polyacrylonitrile, polyvinyl alcohol and other synthetic fibers, cellulose Semi-synthetic fibers such as diacetates and triacetates (such as diacetate and triacetate), regenerated fibers such as cellulose (such as rayon and cupra), and proteins (such as casein fibers), etc. Furthermore, these may be combined. Of these, polyethylene terephthalate, which is superior in terms of price and strength, is preferable.

  In general, it is known that a chemical fiber is kneaded with a small amount of titanium oxide as a matting agent in a polymer or spinning solution in order to adjust gloss and whiteness. While the gloss decreases substantially in proportion to the amount of titanium oxide kneaded, the whiteness increases. Depending on its degree, the chemical fibers are bright and low whiteness bright (titanium oxide content 0.01 to 0.1% by weight), non-glossy and whiteness fuller (titanium oxide content 1.0 to 3). 0.0% by weight) and a semi-dial that is slightly glossy between these (titanium oxide content 0.1 to 1.0% by weight).

  In the present invention, any of bright, semidal, and fullal can be used, but when projecting an image, the whiteness of the diffuse reflection layer affects the contrast, so it is preferable to use semidal or fullal. More preferred.

  For the same reason as described above, a fiber in which a white pigment (metal oxide such as zinc oxide, magnesium oxide or calcium oxide) or a fluorescent dye is kneaded can also be preferably used.

  The yarn used in the present invention may be a spun yarn, a filament yarn, a processed yarn made of them (for example, a bulky processed yarn, a wooly yarn, etc.), and a composite yarn, but the filament yarn is used because of its excellent contrast. Preferably, a multifilament yarn that easily causes irregular reflection of light is more preferable. For the same reason, fibers having random irregularities on the surface (such as microcrater fibers) and yarns made of irregular cross-section fibers can also be preferably used.

  The total fineness of the multifilament yarn is preferably 20 to 1000 dtex, more preferably 50 to 170 dtex. When the total fineness is less than 20 dtex, the fabric and the diffuse reflection type screen using the fineness are not preferred because the fabric weight and the thickness are insufficient, and there is a disadvantage that the fabric flutters in the wind. On the other hand, if the total fineness exceeds 1000 dtex, the fabric weight and diffuse reflection type screen using the same will be excessive, and the fabric weight and thickness will be excessive.

  Moreover, it is preferable that the fineness of the single yarn which comprises a multifilament yarn is 0.1-15 decitex, More preferably, it is 1-4 decitex. When the single yarn fineness is less than 0.1 dtex, it is not preferable because a sufficient strength and elongation cannot be obtained in a fabric using the same, and when the single yarn fineness exceeds 15 dtex, the irregular reflection of light is insufficient.

  When the fabric is a woven fabric, the weaving density is preferably 30 to 450 yarns / inch, and more preferably 50 to 175 yarns / inch. When the warp density is less than 30 yarns / inch, it is not preferable because an image is projected on a diffuse reflection type screen using the warp density. On the other hand, when the warp density exceeds 450 yarns / inch, the fabric and the diffuse reflection type screen using the fabric have an excessive weight per unit area and thickness, which is not preferable because it is difficult to wind and the handling property is inferior.

  For the same reason as described above, the weft density is preferably 25 to 450 yarns / inch, more preferably 40 to 150 yarns / inch.

  When the fabric is a knitted fabric, the course direction is preferably 10 to 200 courses / inch in the course direction, and more preferably 25 to 100 courses / inch. When the number of courses is less than 10 courses / inch, it is not preferable because images are not sharp when projected onto a diffuse reflection type screen using the number of courses. On the other hand, when the number of courses exceeds 200 courses / inch, the fabric and the diffuse reflection type screen using the same are excessively large in weight and thickness, and are not preferable because they are difficult to wind and have poor handleability.

  For the same reason as described above, the knitting density in the well direction is preferably 10 to 100 well / inch, and more preferably 18 to 50 well / inch.

The fabric weight is preferably 20 to 1000 g / m ² , more preferably 50 to 500 g / m ² . When the basis weight is less than 20 g / m ² , a diffuse reflection type screen using the basis weight is not preferable because it has a drawback of flying in the wind. On the other hand, if the basis weight exceeds 1000 g / m ² , it is not preferable because it is difficult to wind up and the handleability is poor in a diffuse reflection type screen using the same. In addition, a burden is applied to the winding device, which may cause a problem in commercialization.

  The thickness of the fabric is preferably 50 to 1000 μm, more preferably 100 to 600 μm. When the thickness is less than 50 μm, a diffuse reflection type screen using the thickness is not preferable because it has a defect of flying in the wind at the time of use. On the other hand, when the thickness exceeds 1000 μm, it is difficult to wind the diffuse reflection type screen using this, and the handling property is inferior, which is not preferable.

  The diffuse reflection type screen of the present invention is a light shielding material comprising at least one fabric having dimensional stability via an adhesive on a diffuse reflection layer made of a fabric in which random fine irregularities are formed on the fabric surface by the weaving and knitting. It has a structure in which layers are laminated. The light shielding layer is for shielding external light from the back surface (back surface) of the screen so that it does not pass through. The light shielding ratio is 90.0% or more, preferably 95.0% or more, more preferably 98.0%. As described above, it is particularly preferably 99.4% or more. If the light shielding ratio is less than 90.0%, external light is excessively transmitted, which adversely affects the image. The light shielding rate of the diffuse reflection type screen is realized by the contribution of only the light shielding layer. That is, the light shielding layer alone is required to have a similar light shielding rate.

  In the present invention, by using a fabric having dimensional stability as a light-shielding layer, it effectively prevents the occurrence of curling, which has been a problem in conventional diffuse reflection type screens in which the back surface of a special polyester fabric is resin-treated. To do.

  The light shielding layer may be composed of a single fabric having dimensional stability and light shielding properties, or may exhibit light shielding properties by laminating a plurality of fabrics having dimensional stability, In short, it is sufficient that the numerical value of the light shielding rate is satisfied as a whole, but considering simplification of the manufacturing process, cost, thickness, etc., it is preferable that a single fabric has both dimensional stability and light shielding properties.

  Hereinafter, a case where the light shielding layer is made of a single fabric having dimensional stability and light shielding properties will be described. When a plurality of fabrics are laminated to form a light-shielding layer, an appropriate selection may be made in consideration of the overall weight and thickness.

  The fabric constituting the light shielding layer is preferably colored so as not to transmit light, and particularly preferably colored dark. As a coloring method, any of a method of kneading a pigment or the like in a high molecular polymer or spinning dope before forming a fiber or fabric, or a method of coloring with a dye after forming a fiber or fabric is possible. Considering the production cost, it is preferable to use the former, that is, the original yarn. In addition, the cloth should just be colored to such an extent that the said light-shielding property is satisfied, and the whole does not necessarily need to be colored.

  The form of the fabric forming the light shielding layer is not particularly limited, and may be any one of woven fabric, knitted fabric, and nonwoven fabric. The type of the woven structure, the knitted structure, and the nonwoven fabric is not particularly limited, but among them, a double-sided satin texture (double-sided satin weave or double-faced satin knitting) is preferable because of excellent light shielding properties.

  The fiber material constituting the light shielding layer fabric is not particularly limited, but is preferably a chemical fiber for the same reason as in the case of the fabric forming the diffuse reflection layer. The types are exactly the same. The same is true in that polyethylene terephthalate, which is advantageous in terms of price and strength, is preferable.

  When the light-shielding layer fabric is a woven fabric or a knitted fabric, the yarn used may be a spun yarn, a filament yarn, a processed yarn (for example, a bulky processed yarn or a wooly yarn), and a composite yarn. Filament yarns are preferred and multifilament yarns are more preferred because uniform light-shielding properties can be easily obtained over the entire surface.

  Here, the total fineness and single yarn fineness of the multifilament yarn are exactly the same as those of the fabric for forming the diffuse reflection surface. That is, the total fineness is preferably 20 to 1000 dtex, more preferably 50 to 170 dtex, and the single yarn fineness is preferably 0.1 to 15 dtex, more preferably 1 to 4 dtex. It is. The reason why less than 0.1 dtex is not preferable is that sufficient strength and elongation cannot be obtained as in the case of the diffuse reflection layer. On the other hand, if it exceeds 15 dtex, the fabric weight and the diffuse reflection screen forming the light-shielding layer are excessive, and the fabric weight and thickness are excessive.

  When the light-shielding layer fabric is a woven fabric, the weaving density is preferably 30 to 2000 yarns / inch, and more preferably 50 to 500 yarns / inch. If the warp density is less than 30 yarns / inch, the target light shielding rate cannot be obtained, which is not preferable. On the other hand, if the warp density exceeds 2000 yarns / inch, the fabric and the diffuse reflection type screen using the fabric have an excessive weight per unit area and thickness, which is not preferable because it is difficult to wind and inferior handling properties.

  For the same reason as described above, the weft density is preferably 25 to 2000 / inch, more preferably 40 to 200 / inch.

  The preferred range of knitting density when the light shielding layer fabric is a knitted fabric is exactly the same as that of the fabric for forming the diffuse reflection surface described above. That is, the knitting density in the course direction is preferably 10 to 200 course / inch, more preferably 25 to 100 course / inch, and the knitting density in the well direction is preferably 10 to 100 well / inch, More preferably, it is 18-50 wells / inch. If the number of courses is less than 10 courses / inch or the number of wells is less than 10 wells / inch, the target light shielding rate cannot be obtained, which is not preferable. The disadvantages when the number of courses exceeds 200 courses / inch or when the number of wells exceeds 100 wells / inch are exactly the same as those of the fabric for forming the diffuse reflection surface.

  Moreover, the preferable range about the fabric weight and thickness which make a light shielding layer, and the reason are also the same as the case of the fabric for making the above-mentioned diffuse reflection surface.

  Next, the adhesive used in the present invention will be described. Adhesives are classified into solution (solvent) type adhesives, aqueous solution type adhesives, emulsion type adhesives, liquid reaction type adhesives, hot melt type adhesives, etc., depending on how fluidity is given during bonding. Is done. In the present invention, any of the above adhesives can be used. However, it is preferable to select an adhesive that does not cause yellowing even when exposed to ultraviolet rays.

The application amount of the adhesive is preferably 1 to 50 g / m ² , more preferably 5 to 25 g / m ² . If the coating amount is less than 1 g / m ² , sufficient adhesive strength cannot be obtained, and if the coating amount exceeds 50 g / m ² , the adhesive may ooze out on the fabric surface.

  The fabric to which the adhesive is applied can be either a fabric that serves as a diffuse reflection layer or a fabric that serves as a light shielding layer. That is, the diffuse reflection type screen of the present invention adheres to the cloth to be the light shielding layer even if it is manufactured by applying an adhesive to the cloth to be the diffuse reflection layer and then bonding the cloth to be the light shielding layer. After applying the agent, it may be manufactured by pasting a fabric to be a diffuse reflection layer. From the viewpoint of preventing the bleeding of the adhesive, it is recommended to apply the adhesive to a fabric having a large thickness, usually a fabric serving as a light shielding layer.

The basis weight of the entire diffuse reflection type screen formed by laminating the diffuse reflection layer, the adhesive layer and the light shielding layer is preferably 45 to 1500 g / m ² , more preferably 100 to 600 g / m ² . When the basis weight is less than 45 g / m ² , the diffuse reflection type screen using the basis weight is not preferable because it has a drawback of flying in the wind. On the other hand, if the basis weight exceeds 1500 g / m ² , it is not preferable because it is difficult to wind up and the handleability is poor in a diffuse reflection type screen using the same. In addition, a burden is applied to the winding device, which may cause a problem in commercialization.

  The thickness of the diffuse reflection type screen as a whole is preferably 100 to 1500 μm, and more preferably 200 to 600 μm. When the thickness is less than 100 μm, a diffuse reflection type screen using the thickness is not preferable because it has a defect of flying in the wind at the time of use, and also has a defect of deteriorating image quality due to stray light from the back. On the other hand, if the thickness exceeds 1500 μm, it is difficult to wind up and the handling property is inferior in a diffuse reflection type screen using the thickness. In addition, a burden is applied to the winding device, which may cause a problem in commercialization.

  The diffuse reflection type screen of the present invention thus obtained is free from curling which has been a problem in the conventional diffuse reflection type screen in which the back surface of the polyester special fabric is processed with resin, and the diffuse reflection type screen. It is possible to sufficiently satisfy many conditions to be provided as, for example, whiteness, screen gain, contrast and the like.

  The curling rate of the diffuse reflection type screen is preferably 10% or less, more preferably 5% or less in both the vertical and horizontal directions. If the curling rate exceeds 10%, image distortion occurs, which is not preferable.

  The whiteness of the diffuse reflection type screen largely depends on the whiteness of the diffuse reflection layer, but is also affected by the degree of coloring of the light shielding layer. The whiteness of the diffuse reflection type screen is preferably 50 to 200%, more preferably 80 to 120%. If the whiteness is less than 50%, the image is dark and the contrast is lowered, which is not preferable. If the whiteness exceeds 200%, the image is unclear, which is not preferable.

  The peak gain of the diffuse reflection type screen is preferably 0.5 to 1.5, more preferably 0.7 to 1.2. If the peak gain is less than 0.5, it is not preferable because the image is dark and the contrast is lowered, and if the peak gain exceeds 1.5, the viewing angle is narrowed and cannot be said to be a diffuse reflection type screen. End up.

  Hereinafter, the present invention will be described in more detail with reference to examples.

<Measurement method>
(1) Surface roughness (SMD)
Measurement was performed using a surface tester KES-FB4 manufactured by Kautotech Co., Ltd.

(2) Light shielding rate It measured by A method of JISL1055-1987.

(3) Whiteness Measured according to JIS Z 8715-1999.

(4) Screen gain A perfect diffusion plate (showing a substantially constant reflectivity in any direction within the range of 180 ° up / down / left / right) is irradiated with a constant light, and its reflection luminance is set to 1, and the sample ( The ratio of the reflected luminance when the screen was irradiated with light was determined. The measurement is performed using “GP200” of Murakami Color Research Laboratory Co., Ltd. at a point that moves on the same arc from the center point to the left and right every 85 ° to 85 °, and the highest screen gain is the peak gain. did.

(5) Curling After a sample (screen) of 10 cm × 10 cm was maintained in an atmosphere of 20 ° C. and 65% RH for 4 hours, the curling rate was determined by the following formula.

Curling rate (%) = (L0−L1) / L0X100
L0: the length of the flat sample before curling, ie,
The length of the sample in the stretched state (here 10 cm).

L1: The length of the sample when curled ears (for example, 1 cm each on the left and right edges) are removed after curling. That is, the length of the flat part which is not curled (for example, 8 cm excluding the curled part of 1 cm on the left and right).

(6) Contrast Using Cue Tick Co., Ltd. video software “The Light Explores”, white, black and skin color were subjected to relative evaluation based on Comparative Example 1. This evaluation was performed by sensory evaluation, and three-level evaluation was performed as follows.

  ○: The color sensation of the color of interest (that is, whiteness in the evaluation for white, blackness in the evaluation for black, and color sensation close to human skin in the evaluation for skin color) is higher than Comparative Example 1.

  (Triangle | delta): The color feeling of the color to notice is the same as the comparative example 1.

  X: The color sensation of the color of interest is inferior to that of Comparative Example 1.

[Example 1]
As a diffuse reflection layer, both warp and weft are woven into a satin weave using 84 dtex / 72 filament polyethylene terephthalate full thread, and after scouring and drying, weft density is 116 / inch, weft density is 100 / inch, basis weight A fabric (A) having a thickness of 70 g / m ² and a thickness of 170 μm was obtained.

On the other hand, as a light-shielding layer, we woven into a double-faced satin weave using 84 dtex / 72 filament polyethylene terephthalate full dull yarn for warp and 84 dtex / 36 filament polyethylene terephthalate black original yarn for weft to obtain scouring and drying A fabric (B) having a warp density of 350 / inch, a weft density of 114 / inch, a basis weight of 160 g / m ² , a thickness of 300 μm, and a light shielding ratio of 99.74% was obtained.

A solvent-based polyurethane adhesive (solid content: 40%) was applied to the fabric (B) by a gravure coating method at a solid content base of 15 g / m ² . Then, it dried at 100 degreeC and volatilized the organic solvent. After laminating the fabric (A), the fabric (A) was pressed with a pair of rotating cylinders (60 ° C.), and further aged at room temperature for 48 hours. In this way, the diffuse reflection type screen of the present invention having an overall basis weight of 245 g / m ² and an overall thickness of 440 μm was obtained.

[Example 2]
As a diffuse reflection layer, weaved into a satin weave using 84 dtex / 72 filament polyethylene terephthalate full dull yarn as the warp yarn and 84 dtex / 72 filament polyethylene terephthalate white pigment kneaded semidal yarn as the weft yarn, scoured and dried A fabric (C) having a warp density of 116 / inch, a weft density of 100 / inch, a basis weight of 70 g / m ² , and a thickness of 170 μm was obtained.

On the other hand, as a light-shielding layer, an 84 dtex / 36 filament polyethylene terephthalate semi-dal yarn and an 84 dtex / 36 filament polyethylene terephthalate black original yarn are used as the warp yarn, and a 165 dtex / 48 filament polyethylene terephthalate black original yarn is used as the weft yarn. Weaving into a double-faced satin weave using scouring, drying, and obtaining a fabric (D) having a warp density of 280 / inch, a weft density of 100 / inch, a basis weight of 185 g / m ² , a thickness of 400 μm, and a light shielding rate of 100% Obtained. In addition, many semi-dal yarns (warps) appear on one side of the fabric, and many black original yarns (warps) appear on the other side.

The face of the person who Semidaru yarn in fabric (D) (warp) has appeared most, solvent-based polyurethane adhesive (40% solids) by a gravure coating method, and 15 g / m ² coated on a solids basis. Then, it dried at 100 degreeC and volatilized the organic solvent. After laminating the fabric (C), the fabric (C) was pressed with a pair of rotating cylinders (60 ° C.), and further aged at room temperature for 48 hours. Thus, the diffuse reflection type screen of the present invention having an overall basis weight of 270 g / m ² and an overall thickness of 470 μm was obtained.

[Comparative Example 1]
A commercially available diffuse reflection type screen having a resin processed on the back side of a polyester special fabric was used. Here, the polyester special woven fabric is a double woven fabric in which the front side texture forming the reflective surface is satin weave and the back side texture is satin weave, and the diffuse reflection type screen has a basis weight of 290 g / m ² and a thickness of 430 μm.

[Comparative Example 2]
A commercially available diffuse reflection type screen in which a white vinyl chloride resin sheet was laminated on one surface of a plain woven fabric made of glass fibers and a black vinyl chloride resin sheet was laminated on the other surface was used. Here, the diffuse reflection type screen has a basis weight of 450 g / m ² and a thickness of 350 μm.

The measurement results for the above Examples and Comparative Examples are summarized in the following table.

  As can be seen from the table, the diffuse reflection type screens of Examples 1 and 2 had a very low curling rate of 1 to 4%. On the other hand, in Comparative Examples 1 and 2 using commercially available products, the curling rate was 11 to 25%, which was a very large value.

  Moreover, the diffuse reflection type screens of Examples 1 and 2 had a surface roughness (SMD) as low as 0.42 to 0.44 μm, and no anisotropy (depending on the weaving direction) was observed. On the other hand, in Comparative Examples 1 and 2 using commercially available products, not only was it quite large as 0.50 to 0.94 μm, but also anisotropy was noticeable.

  The diffuse reflection type screens of Examples 1 and 2 were not inferior at all in comparison with Comparative Examples 1 and 2 with respect to the light blocking ratio and the whiteness. The peak gain in the front direction (near 0 °) was 0.76, and the difference from the gain at + 80 ° was 0.07 to 0.10. That is, the screen gain bias was sufficiently small.

  On the other hand, in Comparative Example 2, the difference between the peak gain and the gain at + 80 ° was 0.34, and the deviation of reflectance in the front direction was large, which was not preferable.

  The diffuse reflection type screens of Examples 1 and 2 are superior to the diffuse reflection type screens of Comparative Examples 1 and 2 in that black is reflected with a high contrast, and also superior in overall image contrast. It was.

Claims (7)

In the diffuse reflection type screen made of fabric,
A diffuse reflection layer made of fabric and having random fine irregularities formed on the surface by weaving or knitting itself;
A light-shielding layer comprising at least one fabric, realizing a light-shielding rate of 90.0% or more with the fabric itself, and having dimensional stability;
A diffuse reflection type screen comprising an adhesive layer for bonding the diffuse reflection layer and the light shielding layer to each other. 2. The diffuse reflection type screen according to claim 1, wherein the surface roughness (SMD) due to the fine irregularities is 0.1 to 2.0 microns in both the vertical and horizontal directions. The diffuse reflection type screen according to claim 1 or 2, wherein the diffuse reflection layer is a woven or knitted fabric of a satin texture using a multifilament yarn kneaded with titanium oxide, a white pigment or a fluorescent dye. The diffuse reflection type screen according to any one of claims 1 to 3, wherein the light shielding layer is a woven or knitted fabric having a double-faced satin structure using a multi-filament yarn attached to black. 2. The diffuse reflection type screen according to claim 1, wherein the curling rate is 10% or less due to dimensional stability of the light shielding layer with respect to the diffuse reflection layer. The diffuse reflection type screen according to claim 1, wherein the light shielding ratio is 95.0% or more. In the method of manufacturing a diffuse reflection type screen made of a fabric,
A diffuse reflection layer made of fabric and having random fine irregularities formed on the surface by weaving or knitting itself;
After producing at least one piece of fabric, and producing a light shielding layer that achieves a light shielding rate of 90.0% or more and dimensional stability with respect to the diffusive reflective layer by the fabric itself,
A manufacturing method of a diffuse reflection type screen, characterized in that these fabrics are bonded together.