Spiral binding: a method of binding in which a continuous wire is threaded through holes punched in the binding edge of the pages. see mechanical binding.
螺旋装：把书页在装订边打孔，用连续的金属丝作螺纹式穿过的装订方法。参阅机械式装订。
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Ring binding: A form of loose leaf binding in which two or more rings pass through punched holes AT the edge of the paper.
铁环装：是活页装的一种。它用两个或以上的铁环，穿过在纸边打孔的纸张。
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The shape of the male die cutting edge was determined by experiment. The products punched had minimal burr and smooth section.