Method and apparatus for threading a fibrous material web in a winder

An apparatus for adhesive-free threading of a thick fibrous material web, especially a pulp web, for winding around a winding body, comprising:

• a winding body;
• a first bearer drum;
• a second bearer drum;
• wherein the first bearer drum is spaced from the second bearer drum to define a gap therebetween, the winding body being held over the gap;
• wherein the winding body forms a first nip with the first bearer drum, and a second nip with the second bearer drum, the first nip defining a first side of the winding body, and the second nip defining a second side of the winding body;
• wherein the fibrous material web is wrapped over the first bearer drum and extends downwardly through the first nip;
• a diverting device below the winding body and extending into the gap, the diverting device arranged to guide the fibrous material web upwardly through the second nip;
• a threading device arranged to extend in a first direction from the second side toward the first side of the winding body;
• a diverting device forming a part of the threading device and arranged to divert the fibrous material web in a circumferential direction defined by the winding body toward the first nip, and
• a guiding device forming a part of the threading device, the guiding device for guiding the fibrous material web with an unfolded leading edge ahead in a direction toward the first nip, so that the leading edge of the fibrous material web is caught in the first nip by an interaction with the fibrous material web as it wraps the first bearer drum.

An apparatus for adhesive-free threading of a thick fibrous material web, for winding around a winding body, comprising:

• a first winding drum;
• a second winding drum forming a winding bed with the first winding drum;
• wherein the thick fibrous material web has an unfolded leading edge and is at least 0.7 mm thick;
• wherein the winding body is adhesive-free and is arranged to rotate in the winding bed and wherein a first nip is formed between the winding body and the first drum, and a second nip is formed between the winding body and the second drum and wherein the fibrous material web wraps a portion of the first drum and extends through the first nip and extends under the winding body to the second nip, and from the second nip the fibrous material web extends over the winding body so that the unfolded leading edge enters the first nip from above;
• a diverting devise including a diverting roll in driven relation to a drive, the diverting roll engaging the thick fibrous material web against the winding body so that the drive applies tension to the thick fibrous material web in a circumferential direction defined by the winding body, wherein the diverting roll is arranged to divert the fibrous material web in the circumferential direction after the fibrous material web passes through the second nip;
• at least one guide plate disposed in a running direction of the fibrous material web with respect to the diverting device, the at least one guide plate being bent in parallel to the circumferential shape of the winding body, wherein the at least one guide plate has a comb-like shape including teeth extending in the running direction of the web and rolls are arranged between the teeth;
• and
• wherein the guiding plate is for guiding the fibrous material web with the unfolded leading edge toward the first nip, so that the unfolded leading edge of the fibrous material web is caught in the nip by an interaction with the fibrous material web wrapping the first drum and in nipping engagement with the winding body.