DEVICE FOR THE MEASUREMENT OF THE POWDERING BEHAVIOUR OF POWDERY AND GRANULAR MATERIALS

摘要

The dust producing properties of a pigment or dye are measured under conditions which close approximate those during handling. A vessel with baffles having pigment or dye therein is rotated for a specified time while air is drawn through the rotating vessel by a specified amount of vacuum applied downstream of the vessel. The baffles disturb the pigment or dye in the vessel, creating dust particles which are entrained in an airstream created by the vacuum. Larger particles trapped in this vacuum are removed by a separator, while the dust particles are trapped in the airstream are trapped by a filter. The dusting properties of the pigment or dye in the vessel may then be determined by weighing the filter.