Spiral Book Printing

It also be called YO binding, coil binding, which have 2 different materials. And also another structure to hide the coil. Please check as right side.

Metal Coil

The coil is made by 2 lines metal line. And need the hole is quare.

Plastic Coil

This coil is made by plastic line screwed as a snake.

Hided Coil

This bound will hide the plastic coil into the spine area.

Spiral Book Printing With Hidden Coil