Turn-up method and a turn-up device for a reel-up for reeling of fiber webs

A turn-up method in a reel-up for reeling of fiber webs, comprising the steps of:

• cutting in a reel-up, a fiber web travelling in a machine direction, wherein the fiber web defines a first machine direction edge and a second opposed machine direction edge;
• wherein the cutting is performed with a first water jet nozzle connected to a first source of cutting pressure and a second water jet nozzle connected to a second source of cutting pressure;
• wherein the first water jet nozzle forms a first cut, starting at the first machine direction edge, and the second water jet nozzle forms a second cut starting at the second opposed machine direction edge;
• moving the first water jet nozzle and the second water jet nozzle toward each other in a cross-machine direction with respect to the fiber web toward a center area of the fiber web, which center area is about equally spaced between the first and second machine direction edges;
• causing the first and second cuts to meet or cross at the center area of the fiber web to form a convex shaped tail end to the fiber web which comes to a point;
• after forming the convex shaped tail end of the fiber web, pausing the movement of the first and second water jet nozzles and pausing cutting with the first and second water jet nozzles long enough to prevent formation of more than one reject part of the fiber web;
• after pausing the first and second water jet nozzles and the cutting action of the first and second water jets, restarting the movement of the first and second water jet nozzles from the center area of the fiber web and the cutting action of the first and second water jet nozzles from the center area of the fiber web;
• and
• moving the water jet nozzles from the center area of the fiber web to one of the opposed machine direction edges of the fiber web so that the fiber web is cut by a third cut and a fourth cut to form a convex shaped beginning end of the fiber web which begins with a point and between the cuts for the tail end and the cuts for the beginning end forming only one reject part of the fiber web.