first guide roll 7 of the second wire sieve 5 the operation zone of the formed between the first and second guide rolls 3 4 of the second wire sieve 1 a nozzle 9 is positioned at the beginning of the operation zone of the apparatus over the open space of the first wire sieve 1 for feeding a pulp fibre suspension 13 on the first wire sieve 1 on the opposite end of the operation zone is winder roll 11 or corresponding winding apparatus for collecting the manufactured yarn the second guide roll 8 of the second wire sieve 5 and the second guide roll 4 of the first wire sieve 1 are spaced apart so that open space is formed on the first wire sieve 1 between these guide rolls 4 8 over this space optional heaters 12 can be placed suitable heaters are infrared heaters hot air dryers or other known dryers or heaters used for example in paper pulp and board industry a suction box 14 for removing water and moisture from the yarn through the wire sieve can be placed on opposite side of each wire sieve 1 5 in relation to the yarn to be formed in this example one suction box 14 is placed under the first wire sieve the wire sieves 1 5 and winder roll are rotated by driven guide rolls for example by means of electric motors or corresponding actuatiors yarn is manufactured by the above described apparatus by feeding pulp fibre suspension over the first wire sieve 1 so that the running.