A4 paper usually requires how many loop coils.

A4 paper usually requires how many loop coils.
A4 size paper is the most common and extensive book paper, usually used for children's books and notebooks. According to American standards and international standards, A4 paper is bound with double coils. 3 / 16-5 / 8 3: 1 pitch usually requires 34 loops or 32 loops, 5 / 8-1-3 / 4size 2: 1 pitch usually requires 23 loops Or 23loops
Of course you can decide the loops you need based on the holes in your book