A jig has two winding rolls in two troughs which surround the winding rolls concentrically and contain treatment liquor, and a squeezing device for a web of material passing from the one to the other winding roll arranged between the winding rolls. The squeezing device is arranged high enough that the web of material runs from the squeezing device downward toward both sides. A partition extends upward between the troughs up to the squeezing device.