| 摘要 |
<p>A spray apparatus has first (14) and second (12) elongate ducts. The material to be sprayed, which may be solid or liquid, is delivered through the first elongate duct (14) to an elongate slot-shaped nozzle or other means for distributing it. To reduce disturbance by de-energizing ambient air currents, the second elongate duct (12) supplies air to first and second air distribution outlets (18, 20), each of which defines an elongate slot-shaped nozzle. The nozzle is directed outwardly, away from the air distribution mechanism and towards the surface on which the material is to be distributed, so as to form air curtains on either side of the elongate ducts. The elongate air distribution outlet can form an elongate slot-shaped nozzle having a convergent inlet section, a throat section and a diffuser section extending to an outlet port. It can also include fins (114) extending into the air duct, to deflect air from the air duct through the slot-shape nozzle.</p> |
