Hydraulic atomization

Liquid-Sheet Breakup The basic principle of most hydraulic atomizers is to form a thin sheet that breaks via a variety of mechanisms to form ligaments of liquid which in turn yield chains of droplets. See Fig. 14-86. 

Hydration antifouling coatings, 7 158 Hydraulic atomizers, 23 175 Hydraulic cements, 5 467, 500-501 Hydraulic-centrifugal classifiers, 22 275 Hydraulic classifiers, 76 619 Hydraulic conductivity, of landfill liners, 25 878... 

Safety. The minimum explosive concentration for sulfur is 35 g/cu m of air. The heaviest dust loading measured in the sulfur-coating drum while using hydraulic atomizing nozzles was 3.2 g/cu m of air, well below the explosive range. 

Table 3 shows the effect of the hydraulic atomization on the particle formation. No clear difference in particle morphology was observed for different atomization pressures (Patom-) The obtained powder consists of agglomerated particles (Fig. 8.b). The particles tend to stick together and are distorted. Further, the size of the particles is for each experiment in the range of 10 to 50 microns. The bulk density of the particles did not change considerably (Fig. 8a). 

Table 3 The effect of the hydraulic atomization on the particle morphology...

Suitable for special-effect paints Airless (hydraulic) atomization ... 

In airless hydraulic) atomization the paint is forced through a slit nozzle of hard metal under high pressure (8-40 MPa). On account of the high degree of turbulence, the paint stream disintegrates immediately after leaving the fluid tip. A similar atomization process occurs in spray cans where the paint pressure is produced by the propellant gas. 

Recent Developments. A completely new process for the manufacture of coating powders has been recently developed by the Ferro Corp. It involves solvating resinous components in supercritical gas, typically carbon dioxide (CO2), and dispersing the pigments and other solid ingredients with an impeller or dispersion blade. After dispersion is completed, the material is hydraulically atomized... 

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