Abstract: A method and a device for further processing of sheets to produce multi-page printed products, several initial sheets (19) are each folded into a folded sheet (20) and subsequently collated one on top of the other such that the fold areas lie at the top and the folded sheets (20) open downwardly. A grooved line (30) is formed in each initial sheet (19) before folding, around which grooved line (30) the initial sheet (19) is subsequently folded, the depth and the width of the grooved line (30) being increased, initial sheet (19) by initial sheet (19), by a predetermined amount.

Abstract: A method and a device for further processing of sheets to produce multi-page printed products, several initial sheets (19) are each folded into a folded sheet (20) and subsequently collated one on top of the other such that the fold areas lie at the top and the folded sheets (20) open downwardly. A grooved line (30) is formed in each initial sheet (19) before folding, around which grooved line (30) the initial sheet (19) is subsequently folded, the depth and the width of the grooved line (30) being increased, initial sheet (19) by initial sheet (19), by a predetermined amount.

Abstract: A folding device comprises a sheet transporting device (52) for transporting sheets (22) in a sheet support plane (BE) and a stationary folding knife (26) arranged opposite the sheet support plane (BE) in a sheet running direction (BL), the folding knife (26) comprising, at the side facing the sheet support plane (BE), folding edge means contacting a sheet (22) during the transport for forming a folding line in the sheet (22). In order to avoid a set-off of the printing color or the toner during the folding of sheets that are hot off the press or digitally printed, the folding edge means (28) comprises several folding rollers (30) being arranged one after the other in the sheet running direction (BL) and each being supported rotatably about a rotation axis (50) extending perpendicularly to the sheet running direction (BL).