SUPERABSORBENT PLEXIFIBRILS, FIBROUS SHEETS MADE OUT OF THEM AND PROCESS FOR THEIR MANUFACTURING

摘要

The invention relates to plexifibrils made by flash spinning of overheated aqueous gels of superabsorbent polymers based on polyacrylic acid. Due to a flash evaporating of solvent water from pressurised aqueous gels extruded through a spinneret, which occurs instantly after the mass left the pressure area the superabsorbent polymer will be disintegrated in plexifibrils. Plexifibrils have a particular form of a network with typical (macro-) length of 400 to 1000 mm and with a typical (micro-) thickness of less than 4 mu m. They can easily be laid in form of nonwoven sheets at a foraminous conveyer belt. Superabsorbent plexifibrils or nonwoven sheets made out of them can be used as constituents in absorption sheets or hygienic items like diapers or sanitary napkins.