Sand mill

Sandarac [9000-57-1] Sandblasting Sand casting Sand cores Sander Cramer test Sandimmun(e) Sand-lime brick Sand mills Sandofan... 

Leuco dye and coreactant are individually milled in an aqueous solution of binder such as poly(vinyl alcohol) or hydroxyethylcellulose by means of an attrition or sand mill until the particle size of the solid materials is about 1 pm or less in diameter. Smaller particles provide superior performance. 

All ball, pebble, rod and cone mills, edge runner mills, tube mills, vibration mills and some ring ball mills may be used wet or dry except where stated. The perl mills, sand mills and colloid mills may be used for wet milling only. 

Binder Absorption, Smear Point, and Yield Point [1.78]. Smear point and yield point are used to determine the binder needed to formulate a suitable millbase for grinding by dissolvers, roll mills, ball mills, attritors, sand mills, and pearl mills. The amount of binder is given in volume or mass units. Apparatus rough glass plate, spatula with steel blade. 

The eventual dispersion process consists of grinding the moist dye, generally in a ball, bead, or sand mill, in the presence of dispersing agents. Since the dyeing rate depends on particle size, the aim is to reduce the particle size to <1 qm. A narrow particle-size distribution is important to minimize recrystallization during storage and application. 

All small media mills or sand mills have water cooling jackets to carry away process heat. In practice, a 50 degree F. temperature difference is desirable between coolant temperature and product temperature at 10 m/sec. 

Stirred media mills (batch and continuous) Stirred ball mills Stirred sand mills... 

Because of their small particle size and their resulting large surface area, pigment blacks are classed as pigments, which are more difficult to disperse. Depending on the supplied form, pigment blacks can be dispersed with all grinding machines, for example sand mill, pearl mill, ball mill, triple roll mill and others. 

Ball, pebble and cone mills Tube mills Sand mills Perl mills Vibration and... 

Impact breakers Ring roll mills Sand mills ... 

Peg and disc mills Sand mills Tends to clog ( )... 

The starting materials in the manufacture of mixed-metal oxide pigments (as a rule carbonates, hydroxides, oxides and oxide-hydrates) are intimately mixed and heated, if necessary with added flux, at temperatures of 1000 to 1300°C. The particle size can be controlled, and thus the coloristic properties influenced, by varying the calcination temperature and the added flux. The 0.2 to 2 pm particles required for the pigment sector are obtained by intensive grinding of the calcined clinker in ball or sand mills. 

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