pre-folder

The inline pre-folder consists of two folding devices. The folding devices can simultaneously perform two folds on the web in full width or (after a center cut) one fold each on the two strands. Each folding device can be moved individually sideways, across the web width. The devices on the operating and drive side are adjusted by motor from the operating side to achieve the desired folding width.

The folding device consists of a three-part, air-flushed bar system. All elements are geometrically arranged to each other. The device is adjusted crosswise to the web via spindle drives. The devices can be mounted in such a way that the web is folded upwards or downwards. Conversion is possible very quickly with just a few screws. Each part of the device is designed for low pressure air. The web runs over an air cushion, allowing higher speeds and a wide paper quality range. The ILF pre-folder is prepared for installation of two electronically controlled drives by the printing press manufacturer.

The production speed is 7-12 m/s, but this depends on the paper, the conditions in the printing room and the operating crew.