SHOCK ABSORBING RUBBER SHEET AND ITS MANUFACTURE

PROBLEM TO BE SOLVED: To prevent the malfunction in a reading operation by providing a rubber sheet which is cross-linked by electron beam radiation, superior in sliding resistance, and has a web texture with thickness of 0.1 to 0.4mm, thickness precision of less than 0.01mm and surface roughness of (Rz)=40 to 200μm. SOLUTION: The texture is formed by transferring a desired surface roughness to a rubber sheet. The desired surface roughness in ten point average roughness Rz is 40 to 200μm. If the Rz is less than 40μm, disks such as a CD has a tendency to be stuck. If the Rz exceeds 200μm, the resistance against sliding becomes insufficient. Moreover, if an average interval S of projecting and recessing parts is less than 150μm, the reduction preventive function of the static friction coefficient is disturbed by the roller effect of stuck dust and the sliding resistivity is reduced. If the interval S is more than 600μm, the static friction coefficient is reduced.