| 摘要 |
PURPOSE: A sheet ring is provided to generate a little waste materials as possible or not to generate at all, and not to generate a projection around a ring. CONSTITUTION: The production method of the sheet ring having at least two side faces each in the opposite side comprises by:a process of molding a continuous starting material(3) by a ring(5); a process of cutting in a regular length; a process of welding ends(6, 7) areas of the ring(5) facing each other; a process of making in a sheet ring(1) shape by a burning transformation; by forming the ring(5); by using a roll device and a cutting device to cut it in a regular length; the completed sheet ring(1) having the form having surfaces(9, 10) horizontally extending each other.
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