Method and device for classifying superabsorbent particles

US10928291B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Oskar Stephan · Hockenheim, DE
• Norbert Eugen Voll · Worms, DE
• Rüdiger Funk · Niedernhausen, DE

Key dates

• Filing date: Jun 29, 2016
• Grant date: Feb 23, 2021
• Expiry date: Jun 29, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2015/0288
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for the classification of superabsorber particles is disclosed, in which the superabsorber particles are put onto a top screen deck of a screening machine having at least two screen decks with a different hole size, the superabsorber particles which are smaller than the holes of the respective screen deck respectively falling through the holes and the superabsorber particles remaining on the screen deck being removed via an extraction point. Balls are positioned on each perforated plate, which balls are propelled upward by the movement of the perforated plate and strike from below the screen deck respectively lying above, wherein the balls have a stiffness in the range from 40 to 100 N/mm and a damping in the range from 1 to 4%. A machine for carrying out the method also is disclosed.