2002 Volume 75 Issue 12 Pages 586-591
At present, such mills that use small size beads are main dispersers in the production lines of electronic materials, paints, cosmetics, inks, etc. The desired additional functions for the conventional dispersers are as follows : higher dispensability ; prevention of contamination without using sand, beads, or balls ; broader manageable viscosity range ; one-path treatment instead of cyclic treatment ; lower power ; easier temperature control ; higher mechanical safety and educability with closed structure, simple structure, and compactness, etc. A new type disperser (Trade name : CLEAR SS 5) has been developed to meet the above demands.
The structural features of this disperser are that it consists of two ringlike disks facing against each other, either or both of which can rotate and one of the disks is at a fixed position while the other has a floating mechanism to absorb alignments. The disk with a floating mechanism can be set up so that the clearance of the dispersion mechanism is constant because it is pressed with air and a spring from the back. Adjustment in the clearance between the disks depends on the velocity of rotation, fluid viscosity, fluid feeding pressure, shape and depth of spiral groove and spring back pressure, and a pressure balance produced can hold clearances between several micrometers and several tens micrometers. Materials to be treated pass through the small clearance part in the tangential direction experiencing a large shear force.
