Reel-up for receiving and winding into a roll a paper web that arrives from a drying cylinder in a paper making machine and a paper making machine using a reel-up

A reel-up (1) for receiving and winding into a roll (5) a paper web (W) that arrives from a drying cylinder (2) in a paper making machine, the reel-up (1) comprising:

• a rotatably mounted reel spool (4) onto which a paper web (W) is wound to create a paper roll (5) of increasing diameter;
• and
• an endless flexible belt (6) mounted for rotation along a predetermined path of travel such that the flexible belt (6) forms a loop, the flexible belt (6) being positioned adjacent to the reel spool (4) to engage the paper web (W) against the reel spool (4) during winding such that the flexible belt (6) is deflected from the predetermined path of travel when the paper roll (5) starts to build up on the reel spool (4),
• wherein:
• the flexible belt (6) is air permeable and at least two blow boxes (7, 8, 9) are arranged inside the loop of the flexible belt (6) such that an underpressure is generated that draws the paper web (W) against the flexible belt (6), the at least two blow boxes (7, 8, 9) each having at least one nozzle (10) shaped as a slot,
• air is blown out of the at least two blow boxes (7, 8, 9) through the at least one nozzle (10),
• the at least two blow boxes (7, 8, 9) each have an outer surface (11) that faces the flexible belt (6) and that is convexly curved such that dust which has been sucked through the flexible belt (6) and lands on the at least two blow boxes (7, 8, 9) is helped by gravity to glide along the outer surface (11) of each of the at least two blow boxes (7, 8, 9) and fall off each of the at least two blow boxes (7, 8, 9);
• the flexible belt (6) is guided in its path by at least a first guide roll (12), a second guide roll (13), and a third guide roll (14),
• a first of the at least two blow boxes (7) is arranged after the first guide roll (12) in the machine direction, such that the nozzle (10) of the first of the at least two blow boxes (7) is configured such that the air blown out of the first of the at least two blow boxes (7) exits the at least one nozzle (10) of the first of the at least two blow boxes (7) in a direction that substantially coincides with the machine direction,
• a second of the at least two blow boxes (9) is arranged before the second guide roll (13) in the machine direction, such that the nozzle (10) of the second of the at least two blow boxes (9) is configured such that the air blown out of the second of the at least two blow boxes (9) exits the at least one nozzle (10) of the second of the at least two blow boxes in a direction opposite the machine direction, and
• the nozzle (10) of each of first and the second of the at least two blow boxes (7, 9) is arranged to blow the air blown out of each of the first and the second of the at least two blow boxes (7, 9) into a space between the first and the second of the at least two blow boxes (7, 9).