Stock material or miscellaneous articles – Structurally defined web or sheet – Continuous and nonuniform or irregular surface on layer or...
Patent
1993-09-29
1995-10-10
Watkins, III, William P.
Stock material or miscellaneous articles
Structurally defined web or sheet
Continuous and nonuniform or irregular surface on layer or...
428142, 428143, 428148, 428220, 428323, 428324, 428328, 4289122, 428913, 359459, 359452, 359461, G03B 2158
Patent
active
054569672
ABSTRACT:
A reflection-type screen that is free from uneven formation attributable to a weave pattern of a ground fabric as a constituent material, can be wound up in a roll form and unwound at need and is less likely to cause deformation, such as buckling, elongation and sagging, and is easy to handle. The reflection-type screen includes a dimensionally stable substrate sheet having an elastic limit of 60 kg/cm.sup.2 or more, a Young's modulus of elasticity of 2.5.times.10.sup.4 kg/cm.sup.2 or more, a bending modulus of elasticity of 3.5.times.10.sup.4 kg/cm.sup.2 or less, a thickness of 35 to 200 .mu.m and a center line average height and a waviness of 100 .mu.m or less each. Laminated on the substrate sheet in the following order is a high-density light diffusion-reflection layer and a translucent light diffusion layer including a soft vinyl chloride sheet, the translucent light diffusion layer having a surface provided with a light-diffusing fine uneven pattern. If necessary, a white or dark-color pigment may be added to the dimensionally stable substrate sheet. Further, in some cases, a white opaque resin layer or both a white opaque resin layer and a dark-color opaque resin layer are laminated in that order on the surface of the dimensionally stable substrate sheet remote from the high-density light diffusion-reflection layer.
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patent: 3811750 (1974-05-01), Coulthard
patent: 4190320 (1980-02-01), Ferro
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Dai Nippon Printing Co. Ltd.
Watkins III William P.
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