SPONGE SHEET USED IN RUBBER FOR TABLE TENNIS, RUBBER FOR TABLE TENNIS AND TABLE TENNIS RACKET

摘要

PROBLEM TO BE SOLVED: To provide a sponge sheet used in a rubber for table tennis, a rubber for table tennis and a table tennis racket, capable of improving ball bounce property and spin property in a table tennis racket, and improving return toss stability in a table tennis racket in various relative speeds when a ball contacts a table tennis racket which is assumed in table tennis playing.;SOLUTION: A sponge sheet used in a rubber for a table tennis has a loss coefficient tanδ₇₀₀ which is 0.02 or lower in a frequency 700 Hz, and a change ratio of the loss coefficient in a range of a frequency 500 Hz to a frequency 900 Hz is 1.08 or lower.;SELECTED DRAWING: None;COPYRIGHT: (C)2019,JPO&INPIT