How to calculate the hard cover size for a book block ?

After the book block is prepared, measure the size of the book block.

Suppose Book block size:

Length: X mm

Width(book thickness): Y mm

Height: Z mm

Grey board thickness: A mm





Material used: Plastic printable tacking paper + Grey board

Hard Cover Data Result :

Spine height: Z + 3mmX2 ( Note 1: hard cover size is usually 3mm larger than the book block. Then, the hard cover can protect the book block)

Spine width: Y + A x 2 -0.5mm

Gap beside spine:  10mm each(We usually use 10mm for each gap)

Cover height: Z + 3mmX2

Cover width: X - 3.5mm

(Note 2: 3.5 means the cover width is usually 3.5mm smaller than the book block width)

Tacking paper height: Z+3mmx2+17mmX2

(Note 3：17 means the folding edge width of the tacking paper is 17mm.)

Tacking paper width: (cover width+10mm) x 2 + spine width + 17mmx2