Patent ID: 8789774

Claim:
A process for producing water-absorbing polymer particles by polymerizing an aqueous monomer solution or suspension comprising a) at least one ethylenically unsaturated monomer which bears an acid group and may be at least partly neutralized, b) at least one crosslinker, c) at least one initiator, d) optionally one or more ethylenically unsaturated monomer copolymerizable with the monomer mentioned under a) and e) optionally one or more water-soluble polymer, comprising drying the resulting aqueous polymer gel on a forced-air belt drier, grinding, classifying, and optionally thermal surface postcrosslinking, wherein the aqueous polymer gel is applied by means of a swivel belt to the conveyor belt of the forced-air belt drier, the swivel belt, proceeding from one end position, is accelerated through a first pivot angle β 1 where β 1 is from 8 to 24° to an angular speed v 1 , decelerated through a second pivot angle β 2 where β 2 is from 10 to 40° to an angular speed v 2 , and decelerated through a third pivot angle β 3 to the other end position, a quotient of angular speed v 2 and angular speed v 1 being from 0.3 to 0.9, and a quotient of length of the swivel belt and width of the conveyor belt of the forced-air belt drier being 0.7 to 1.9, the length of the swivel belt being the distance of the pivot axis from a discharge end.