Double-loop wire binding is a kind of double-wire metal ring formed by bending beforehand, which is put through the square or round holes made beforehand on the loose page, and is pressed by special equipment to complete the binding. Double-wire ring binding is the preferred ring binding, beautiful appearance, strong and durable, can accommodate different materials, different shapes of pages, suitable for less than 1 inch thickness of books, widely used in technical manuals, cooking books, product design manuals and other products. The disadvantage is that after the metal ring is pressed, no more pages can be added.
There are two types of double coil binding: 3: 1 and 2: 1.
3: 1 refers to the number of holes distributed on the length of each inch, which is 3.
2: 1 means 2 holes per inch in length, and the metal ring has better durability and stability.
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