Double coil is the preset size and specifications of the two strands of steel coil, the common material is divided into two kinds of plastic steel ring and plastic coil.
Usually, a round hole or square hole is placed on the left or top of the printed matter. After the YO double loop passes, the YO binding machine is used to compress and fix the whole binding program.
In the choice of coil, it is necessary to pay attention to its quality, and some coils because the surface plating plastic layer is not strong enough, it will cause cracks when binding. The coil is too thin, there will be binding is not strong and other issues.
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