Scraper for the roller surface at a machine for the production or finishing of paper or cardboard or tissue has a box with perforations at the cover to trap and catch separated dirt and debris

摘要

Scraper has a scraper beam (2) with a holder (3) for the scraper blade (5), which can be pressed against the roller (4) mantle surface against its direction of rotation (7). A generally enclosed collection box (8) is at the side of the scraper blade towards the web (1), to collect the debris and dirt detached from the roller (4) mantle surface by the scraper blade (5). The dirt collection box (8) is a hollow body axially along the roller (4), with a perforation (10) at the dirt pick-up zone at a removable cover (9). The perforation (10) is formed at least partially by drillings, or slits preferably on the line of the web travel direction (14) and/or at an angle to it, or the perforation openings are formed by a grid. The dirt collection box (8) acts as a guide for the web (1) on a web break and/or a web strip on transfer. The collection box (8) can also be fitted with guide units such as guide plates and/or blower jets (16).