JP3509160B2 - Exhibit surface resin plate - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin plate for mounting an exhibit such as a work of art. 2. Description of the Related Art Conventionally, exhibits such as paintings, calligraphy works, photographs, posters, and other art objects have to be put in a forehead or a frame and covered with a transparent glass or transparent resin plate as a measure to prevent dirt and damage. Generally done. [0003] However, in the above-described display method, the display is difficult to see due to the dazzling of the light source due to sunlight or ambient lighting, and the shape and surroundings of the illumination device of the light source are difficult to see. In many cases, the scenery is reflected, and the exhibits, especially artworks, are unclear and difficult to appreciate. Accordingly, the present invention is to provide a resin plate for a display article display which eliminates the adverse effects on the display due to the display display and sufficiently expresses the original beauty of the display article. [0005] The present invention provides (1) a total light transmittance (Tt) of 50% or more, (2) a haze of 20% or less,
And (3) In an image sharpness test according to JIS K7105-1981 (a method for testing the optical properties of plastic), the image sharpness measured by applying an optical comb having a width of 1 mm is 10 to 100% in transmitted light. 3-50% in reflected light,
The present invention provides a resin plate for surface mounting of an exhibit. The exhibit of the present invention is a picture, a calligraphy work, a photograph, and a copy of these, a printed matter, a poster, and a plane drawing such as a panel drawing, which can be viewed or viewed by the public or a specific person. Can be done. [0007] The dressing of the present invention protects the above-mentioned display goods in a state of being substantially in close contact with or very close to the above-mentioned display goods. Generally, a frame and a frame are used together. Not necessarily required. As the synthetic resin forming the resin plate of the present invention, for example, polyethylene, polypropylene, ethylene-
Polyolefin resin such as vinyl acetate copolymer and ethylene-methyl methacrylate copolymer; acrylic resin containing polymethyl methacrylate as a main component; styrene resin containing styrene as a main component; vinyl chloride resin; polyester resin; polyacetal resin; Resins; polyamide resins; polycarbonate resins; epoxy resins; polyimide resins and the like. These synthetic resins are used alone or as a mixture, with high transparency. Among them, acrylic resin, styrene resin, vinyl chloride resin, polyester resin, polyolefin resin, polycarbonate resin, epoxy resin and the like are desirable. The total light transmittance of the present invention is a well-known value representing the light transmission characteristic of a resin plate. The higher this value, the brighter the display will look, which is desirable.
Preferably, it is at least 80%. The total light transmittance is largely determined by the type of the resin used, but is slightly lowered by the addition of a light diffusion treatment, an ultraviolet absorber, a dye or the like as described later. In the present invention, the total light transmittance is:
It shall be measured in accordance with ASTM D1003-61. [0010] The smaller the haze of the resin plate of the present invention, the clearer the display, that is, the higher the sharpness. Therefore, the haze of the resin plate of the present invention is 20%.
Or less, preferably 10% or less. The haze in the present invention is measured according to ASTM D1003-61. The haze of the resin plate of the present invention is largely determined by the type of resin used, and is slightly increased by light diffusion treatment or addition of a dye or pigment, as described later. The characteristics of transmitted light and reflected light of the resin plate of the present invention are represented by image clarity. The image clarity of transmitted light is
The larger the size, the clearer the display, without blurring, that is, the sharper. However, the sharpness when viewed visually is affected not only by the sharpness of the image of the transmitted light, but also by the distance between the exhibit and the resin plate. In other words, as the distance increases, the same image sharpness is blurred, that is, the image becomes unclear, and conversely, if the exhibit and the resin plate are in close contact, the image can be seen clearly even if the image sharpness is low. Can be. Therefore, the image sharpness of the transmitted light of the present invention is in the range of 10 to 100%.
The choice can be made according to the form of use. Regarding the image clarity of the reflected light from the resin plate, the larger the value is, the more clearly the light source and the background appear, making it difficult to see the displayed product. If the value is too small, the clearer the image of the transmitted light is. Reduce the degree or increase the haze. Therefore, about 3-50% is suitable. The image clarity of the transmitted light and the image clarity of the reflected light according to the present invention are determined based on the transmission method and the reflection method of the image clarity measuring method of JIS K 7105-1981. It was obtained by measuring using. In the resin plate of the present invention, the image sharpness of the reflected light is adjusted by a light diffusion process for forming irregularities on the surface of the resin plate. The method for forming the irregularities on the surface of the resin plate may be a known method, and is not particularly limited. For example,
As described in JP-B-50-2178 or JP-A-57-14650, at the temperature at which the synthetic resin constituting the resin plate is melted and kneaded, by mixing resin fine particles and inorganic fine particles that do not melt. It can be carried out. These fine particles, the closer the refractive index to the refractive index of the synthetic resin,
It is preferable for haze and image clarity of transmitted light. Further, as the amount of the fine particles increases, the image sharpness of the reflected light becomes smaller, which is preferable. However, the haze and the image sharpness of the transmitted light are adversely affected. Therefore, an appropriate amount of the mixed amount of the fine particles is determined by evaluating the amount and these characteristics in advance through several trials. For forming the irregularities directly on the surface of the resin plate, a processing method called so-called matting or embossing is used. This method is a method in which a resin in a soft state is pressed and transferred to a hard material having unevenness, and the resin is cured. For example, the resin is extruded from a T-die into a plate shape,
This is a method of manufacturing a resin plate by so-called extrusion molding in which it is sandwiched between rolls and cooled, and is disclosed in Japanese Patent Publication No. 47-24475, plastics material course [12] acrylic resin (published by Nikkan Kogyo Shimbun, March 25, 1970, As described in Japanese Patent Publication No. 60-1185, there is a method using a mold roll, so-called sivolol. In addition, there is a method of superimposing a thin transparent film having irregularities as a method of forming irregularities on the surface of the resin plate. For example, as described in Japanese Patent Application Laid-Open No. 4-53839, a mask pattern that partially transmits ultraviolet rays is covered on an ultraviolet-curable resin, partially cured by ultraviolet rays, and uncured portions are removed by an alkali treatment to remove uneven patterns. How to give
There is a method in which a liquid containing a matting agent is applied to the plate surface and cured. According to the method of forming irregularities on the surface of the resin plate as described above, the fineness of the irregularities and the depth of the irregularities can be arbitrarily selected. The light transmittance, the haze, and the image clarity of the transmitted light are also affected, and a balanced one can be obtained by several trials so that these values fall within the specified ranges. The resin plate of the present invention may contain a well-known ultraviolet absorber such as benzotriazole, benzophenone, or hindered amine in order to prevent the display product from being discolored and deteriorated by ultraviolet rays among rays. . Further, a well-known antistatic agent may be added to prevent dust from adhering to the surface of the resin plate. The use of the resin plate for covering an exhibit according to the present invention not only protects the exhibit but also reduces the reflection of the shape of the light source and the surrounding scene when viewing the exhibit. In addition, the display items can be seen clearly without glare. The present invention will be described in more detail with reference to the following Examples, which should not be construed as limiting the present invention. The evaluation method is as follows.・ Total light transmittance and haze: Poic integrating sphere haze meter (SEP-Nippon Seimitsu Optics) in accordance with ASTM D 1003-61.
HS-30D).・ Surface roughness: 10 points average roughness was measured with a surface roughness profile measuring instrument (Surfcom 550A manufactured by Tokyo Seimitsu) in accordance with JIS-B0601. Image clarity of transmitted light and reflected light: Measured using an optical comb having a width of 1 mm by an image clarity measuring device (ICM-1DP manufactured by Suga Test Instruments) in accordance with JIS K 7105-1981. Visual judgment: A sample of a resin plate was placed on a Tyler standard sieve 100 mesh at a horizontal interval of 5 mm, a 15-w fluorescent lamp was turned on from a distance of 3 m in a direction of 75 ° from the horizontal, and a 105 ° The sieves were visually observed from a distance of 30 cm in the direction, and the case where the sieves could be identified was evaluated as ○, and the case where the sieves were blurred or dazzling and could not be identified was evaluated as ×. Examples 1 to 4 and Comparative Examples 1 to 2 100 parts by weight of methacrylic resin beads (Sumipex EX manufactured by Sumitomo Chemical Co., Ltd.) were mixed with crosslinked methacrylic resin beads (average particle size: 30 μm) in the amounts shown in Table 1 and ultraviolet light. After adding 0.02 parts by weight of an absorbent (Tinuvin P manufactured by Ciba Geigy Co., Ltd.) and mixing with a Henschel mixer, an extruder (single screw, screw diameter 40 mm, Tanabe Plastic Co., Ltd.)
The molten resin sheet is extruded at a resin temperature of 265 ° C. at the exit of the T-die at a temperature of 265 ° C., and has a thickness of 2 mm through three polishing rolls.
It was processed into a 27 cm wide sheet. Table 1 shows the evaluation results of the obtained sheets. Examples 5 and 6 100 parts by weight of methacrylic resin beads and 3 parts of an ultraviolet absorber
After adding 00 ppm and mixing with a Henschel mixer, the resin temperature at the outlet was 265 ° C. by the same extruder as in Example 1.
Then, the molten resin sheet was extruded and processed into a sheet having a thickness of 2 mm through three rolls composed of a combination of a polishing roll, a texture roll, and a polishing roll (10-point average roughness of the texture roll; two types of 15 μm and 5 μm). At this time, the surface temperature of the civolol was set to 130 ° C. Table 1 shows the evaluation results of the obtained sheets. Example 7 100 parts by weight of a methylmethacrylate partial weight (syrup) containing 20% by weight of solids were mixed with 0.1% by weight of azobisisobutyronitrile and 250 ppm of an ultraviolet absorber, and then the pressure was reduced. Remove the dissolved air below and remove it by 3mm
Was poured into a cell formed by two pieces of tempered glass with a grain of 30 cm × 30 cm (10-point average roughness: 5 μm) sandwiching a gasket. Polymerization was performed at 56 ° C. for 15 hours, then at 80 ° C. for 3 hours, and further at 100 ° C. for 2 hours to obtain a sheet having a thickness of 3 mm. Table 1 shows the evaluation results of the obtained sheets. [Table 1]

Claims (1)

(57) [Claims] [Claim 1] (1) Total light transmittance is 50% or more, (2) Haze is 20% or less, and (3) JIS K7105-1981 (Test method for optical properties of plastics) The width of the optical comb is 1 in the image sharpness test
An image display resin plate having an image clarity of 10 to 100% for transmitted light and 3 to 50% for reflected light, as measured by applying a diameter of mm.