| 摘要 |
PURPOSE: A spin or hairline processing method of a key pad surface is provided to perform a surface processing without damage to an engraved side. CONSTITUTION: In a spin or hairline processing method of a key pad surface, a number or a pattern(2) is engraved on a plane sheet. A water-soluble paper tape(4) is attached to an engrave board. The board is cut in secondary and is dipped into hot water. An ultrasonic wave is applied the board.
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