Patent ID: 7842150

Claim:
A process for the adhesive connection of sheets in the book-binding field by perforating the sheets along a folding edge, folding the perforated sheets, applying adhesive onto the folding edge, and assembling the sheets into a book block, wherein the perforating process is performed along the folding edge so that two interrupted perforation lines extending a small distance from each other and staggered longitudinally from each other are punched in the shape of a double slit line forming a widened folding edge, the punched spots of the two perforation lines are staggered in view of each other by the length of one perforating tooth in the longitudinal direction relative to each other along the folding edge resulting in the absence of gaps between the punched spots of the staggered two perforation lines along the folded edge, the sheets are folded between the perforation lines for building double sheets forming a front and a rear sided sheet, the punched spots results in alternating recesses along the folding line, which are used as adhesive receiving areas, the double sheets are arranged joining each other and are applied with an adhesive on surfaces associated to each other, produced by double perforations between the recesses of the one perforation line and recesses of the other perforation line, and the double sheets processed in this manner lying one above the other are pressed with the recesses of the subsequent double sheets into a book block.