No abstract

No abstract

No abstract

No abstract

Particulate powders and particle morphologies produced by spray drying are discussed, along with factors that afJect powder quality, e.g. process conditions, and particle properties. Structural categories of spray-dried particles are demonstrated and related to various drying mechanisms. The methodr of studying particle morphology are also outlined with particular reference to the single droplet drying method, reportedly analogous to industrial spray drying and possibly other particulate formation processes. The advantages and disadvantages of the method are discussed and the importance of particle morphology to powder technology emphasised.Particulate powders, as opposed to powders produced by crushing or grinding of a solid after drying or processing, are beneficial to both the manufacturer and the consumer alike. From the manufacturers point of view, particulate powders can be produced continuously, have high throughputs, large surface areas and therefore high drying rates. They are convenient to transport and package both on and off the manufacturing site, and are ready to use without further preparation. They can also be moulded and machined (usually with the incorporation of a binder) into any shape or form. But most importantly, the specifications of a particulate powder can be rapidly altered at the manufacturing stage to suit customer taste, fashion or market demand.