SCREEN FOR PROJECTION AND ITS MANUFACTURE

PURPOSE:To obtain screens for projection having a high surface hardness without increasing their weight, by using a foamed forming body whose surface density is higher than that of the core, for making the supporting body. CONSTITUTION:This screen is formed of a supporting body composed of a outer s...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	GOTOU MASAO, TSUZUKI SUSUMU, YOKONO ATARU, HIYOSHI YASUO, HOSOE YOSHIHISA
Format:	Patent
Sprache:	eng
Schlagworte:	ACCESSORIES THEREFOR AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM CHEMISTRY CINEMATOGRAPHY COMPOSITIONS BASED THEREON ELECTROGRAPHY GENERAL PROCESSES OF COMPOUNDING HOLOGRAPHY LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS PHOTOGRAPHY PHYSICS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL WORKING-UP
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Beschreibung
Zusammenfassung:	PURPOSE:To obtain screens for projection having a high surface hardness without increasing their weight, by using a foamed forming body whose surface density is higher than that of the core, for making the supporting body. CONSTITUTION:This screen is formed of a supporting body composed of a outer skins 6 and 6 and a core 7 and an aluminum foil stuck to the supporting body, and manufactured in such ways that a top mold 1 is pressed against a bottom mold 2 to which the aluminum foil 3 to be used as a reflecting film is fitted by means of a fixing plate 4, and a foaming reaction mixture containing polyisocyanate, polyhydroxy compound, low boiling point solvent and additives is charged into the molds through an inlet 5, and then the formed body formed after reaction of about 10min is taken out and the end parts are cut off. Since the density of the core part 7 is lower than that of the outer skin 6, the surface is hardly scratched and the weight of this screen is lighter than that of conventional ones.