The double loop binding is a double wire ring which is bent in advance, and is sheathed in the square hole or round hole which is pre pressed in the scattered page, and the metal ring is pressed by the special equipment, so as to complete the binding. Double ring is a ring of choice, beautiful appearance, durable, can accommodate different materials and different shapes of the page, for 1 inches below the thickness of the book, widely used in cooking books, technical manuals, product design manual and other products. The disadvantage is that after the metal ring is pressed, the page cannot be added.
There are two types of double coil binding: 3, 1 and 2: 1.
3: 1 refers to the number of holes per inch length is 3, this type of metal ring shape is more beautiful;
2: 1 refers to the distribution of 2 holes per inch length, the durability and stability of this type of metal ring is better.
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