Web guide roller with frontal radiation shield and irradiation device

摘要

A roller (2) for an irradiation device, the roller (2) being designed to guide a material web (1) to be irradiated past at least one electron gun (8), the roller (2) having: a first end-face area ( 14) of the roller, the diameter of the first end-face area (14) being smaller than the diameter of the roller (2), a jacket surface (16) of the roller, which is designed as a jacket surface (16) of a straight circular cylinder, the jacket surface ( 16) extends in the axial direction from a first axial position (45) to a second axial position (49) of the roller (2), the first axial position (45) being an axial distance (46) from the edge of the first end-face area ( 14), which is between 3% and 25% of the length of the roller, and wherein the second axial position (49) is further away from the first end-face region (14) than the first axial position (45), wherein the roller (2 ) a first arched transition be rich (15), which extends from the edge of the first end-face region (14) in an annular manner in a continuous course to the first axial position (45) of the roller (2), in a longitudinal plane through the central axis (3) of the roller (2) considers a curvature of the contour of the roller (2) at the transition from the first frontal area (14) to the first curved transition area (15), within the first curved transition area (15) and at the transition from the first curved transition area (15) to the lateral surface (16) is in each case smaller than a maximum curvature, which corresponds to a minimum radius of curvature of 5% of the diameter of the roller (2), characterized in that a radiation shield made of lead for shielding on the jacket surface (16) or within the jacket surface (16) is arranged by high-energy radiation.