Patent ID: 8709190

Claim:
A method for producing book blocks, of which each is formed from a stack of sheets which are printed on both sides in a digital printing station, the method comprising; laying the sheets which are printed on both sides on one another to form stacks, each stack forming a book block; folding the individual sheets which belong to the same book block once or multiple times about folded edges into folded sheets of two or more leaves including an uppermost and a lowermost leaf, respectively; applying an adhesive to only one leaf of the folded sheets adjacent to the folded edge of the folded sheets which comes to lie in the spine of the book block before or while the folded sheets are placed on one another to form a stack, wherein each adhesive application connects the uppermost leaf of a folded sheet with the lowermost leaf of the next higher folded sheet in the stack, and wherein the adhesive is applied to an area of the folded sheets which is cut away in a further processing step after placing the folded sheets on one another.