How the spine is calculated
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Professional spine calculation formula
0.135 * grams / 100 * number of pages (special note: the number of pages is not the number of yards) = thickness of the spine (in mm)
Add: The number of grams is the weight of the paper, such as 128g copper plate, 157g copper plate, 60g offset plate, the number is the number of grams! ! !
Some numbers after the decimal point are basically rounded off.