| 摘要 |
An elastic ping-pong ball is provided to lower pressure resistance by reducing a region of a back current and pulling a ball body in the opposite direction to a flying direction of the ball body by the back current. Plural dimples(2) are formed on the surface of the elastic ping-pong ball(1) to increase strength and elasticity. Turbulence is generated by making the surface of the ball uneven and the ball is greatly curved and moved irregularly in spinning the ball. Two half-circular ping-pong balls are injected into two molds. Joints of two half-circular balls are bonded by using heat or an adhesive agent. Or, the molds come into contact with each other in a sphere form and then materials for the ping-pong ball are injected by blowing gas.
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