Abstract: A continuous line for chemical treatment and irradiation of a textile web has an irradiation station provided with an outer protective jacket which has elongated openings for passing through the upper and lower runs of the conveyor. The ray exit window in the range of the outer protective jacket is enclosed by an inner protective jacket defining openings for the upper run of the conveyor supporting the web. To reduce leakage, the inner openings are vertically offset relative to the openings in the outer jacket, and the chains in the upper and lower runs of the conveyor are enclosed in protective casings, of which the upper-run casing is provided with slots for guiding the web. Ray-screening means in the form of displaceable screening blocks are provided in the range of the inner and outer openings and are movable together with the guiding channels.