Abstract:
The invention relates to a classification process for superabsorbent polymer particles, comprising classifying the water-absorbent polymer particles in a screen machine under reduced pressure wherein the pressure above the uppermost sieve is from 0 to 4.0 mbar per sieve higher than below the undermost sieve.
Abstract:
The invention relates to a process for producing water-absorbing polymer particles, comprising the steps of: •—processing an aqueous polymer gel from polymerization of a monomer solution or suspension, •—drying the aqueous polymer gel in a conveyer dryer, in particular in a forced air conveyer dryer, wherein •—the conveyer dryer has a circulating conveyer belt and the aqueous polymer gel is conveyed on the circulating conveyer belt, and wherein •—the circulating conveyer belt is formed as a circulating plate conveyer belt, comprising a number of belt plates separated by a hinge line of a hinge assembly and each belt plate having a surface for receiving the aqueous polymer gel, wherein said hinge assembly comprises a knuckle joint (301) with the hinge line in form of a straight hinge line.
Abstract:
The present invention relates to a process for producing fluid-absorbent cores, comprising mixing a fibrous material and fluid-absorbent polymer particles having low moisture content and low apparent density and pressing the obtained mixture under specific conditions.
Abstract:
The present invention relates to a fluid-absorbent article, comprising a water-absorbent core with a basis weight of the fluid-absorbent core at the insult zone of at least 500 gsm, comprising 10 to 100% by weight water-absorbent polymer particles, wherein the water-absorbent polymer particles having a mean sphericity (SPHT) from 0.8 to 0.95 and satisfying the following conditions: (a) the sum of centrifuge retention capacity (CRC) and absorbency under high load (AUHL) being at least 60 g/g, and/or (b) the log10(SFC)>5.7−0.138×CRC, with SFC being not less than 5, wherein the CRC is given in g/g and the SFC in 10−7 cm3−s/g.
Abstract:
A process for continuously preparing water-absorbing polymer beads, comprising the drying of a polymer gel on a forced-air belt dryer, the water content of the polymer gel being used to control the forced-air belt dryer during or after the drying.
Abstract:
The invention relates to a belt drier arrangement for drying an aqueous polymer gel and for comminuting the dried polymer gel to give dried polymer particles, comprising: a drier setup for drying an aqueous polymer gel, a comminuting arrangement downstream of the drier setup relative to the product flow direction, for comminuting the dried polymer gel to give dried polymer particles. In accordance with the invention the comminuting arrangement comprises at least a first comminutor and a second comminutor, each having a rotatable shaft with functional tools, the second comminutor being disposed downstream of the first comminutor relative to the product flow direction.
Abstract:
Filling process for superabsorbent polymer particles The invention relates to a filling process for superabsorbent polymer particles, comprising discharging the superabsorbent polymer particles out of a silo into bulk container for shipping, wherein the filling level of the silo during filling of the bulk container is never less than 20%, in order to avoid particle segregation.
Abstract:
A production process for production of water absorbing polymer particles, including drying an aqueous polymer gel in a belt drier with a conveyor belt having a drier setup in the interior, in which drying air in the interior of the drier setup is conducted in countercurrent counter to the conveying direction and the interior of the drier setup is kept substantially at a reduced pressure relative to the ambient pressure outside the drier setup, and the interior has and/or forms a pressure zone, and is especially divided into a number of pressure zones.
Abstract:
A process for classifying water-absorbing polymer particles, wherein screens having different mesh sizes are used before and after surface postcrosslinking to remove the undersize (fines).
Abstract:
The present invention relates to a process for producing fluid-absorbent cores, comprising mixing a fibrous material and fluid-absorbent polymer particles having low moisture content and low apparent density and pressing the obtained mixture under specific conditions.