Binding specification refers to the maximum punching width and punch area, that is, the maximum width and the area of a pinhole in the binding process of a binding process. The measurement of this index is like mm, and the hole area is expressed as 3mm*8mm.
The thickness of binding is the thickness of the binding documents, which is generally measured in millimeter (mm). But some products are measured by the number of binding pages (Zhang Shu). The thickness of a regular bookbinding machine is between 20mm and 50mm, with a special requirement of 70mm, or from page 400 to page 700. Common applications can choose 20mm products. A product with a special need to choose a larger thickness.
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