Screen for projection and its manufacture

Abstract

Abstract 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.

Inventors

• 👤 Susumu Tsujiku
• 👤 Yasuo Hiyoshi
• 👤 Masao Goto
• 👤 Ataru Yokono
• 👤 Yoshihisa Hosoe

Bibliographic Details