Transmission screen sheet and transmission screen comprising the same

摘要

A transmission screen sheet which is given a large number of lens-like forms on the surface like ridges and has a thickness of 0.1 to 2.0 mm, wherein (i) the sheet is formed from a thermoplastic resin whose inclination (W) obtained from the relationship between melt viscosity (Y) and load (X) satisfies the following expression (1) when the melt viscosity is in the range of 10<2 >to 10<3 >Pa.s, and (ii) the lens-like forms change in height substantially non-stepwise from the center portion or a portion near the center portion to the end portions of the sheet in a direction perpendicular to the ridges: 2x10<-2><=W<=6X10<-2> (1) wherein W is represented by the following equation: W=-(logY/X) wherein X is a load (MPa) and Y is the melt viscosity (Pa.s) of the resin.