The intermediate sheet, the cover of booklet, passport, and the manufacturing process of a sheet

摘要

The intermediate sheet, the cover of booklet, passport, and the manufacturing process of a leaf.The present invention relates to an additional sheet (5) to be inserted between two sheets of which at least one solidarity or belongs to the cover of a book, especially a cover of passport, the additional sheet (5) being intended to be folded in a predetermined zone (21) sec. Back at least a line of training of warp,The intermediate sheet characterized by the fact that it involves, in the zone (21), a means of weakening (20) to increase its capacity of deformation during the formation of the warp.