Bulk flow moisture content

Wet masses produced at the same end-point (regardless of bowl and batch size, impeller speed, and moisture content) have been consistently shown to result in the same final dry granule size distribution, bulk density, flow, and mechanical strength. 

Grindability (in its many different definitions) is a composite material property, and depends on many primary material properties (e.g. particle hardness, bulk and shear moduli of elasticity) as well as its flow properties and other conditions like moisture content, humidity of the atmosphere or material composition (rank or ash content of coal, for example). It also depends on the type of mill used for its evaluation. There have been some attempts made by several authors to find correlations relating different measures of grindability the reader is referred to the literature for details of these54. 

After proving that whole egg powder with corn syrup and salt was more hygroscopic than whole egg powder alone (higher fat content and protein hydrophobicity), Lai et al. (1986) studied the effect of moisture content on compressibility (C2). Moisture content (3-14% dry basis) had almost no effect on the compressibility of whole egg powder, because a higher concentration of lipids was the dominant factor influencing flow properties. However, whole egg powder mixed with corn syrup and salt had a maximum compressibility of about 4.0% dry basis moisture. At this maximum, an increase in bulk density and a decrease in tensile strength were observed. 

Spray drying is by definition the transformation of feed from a fluid state into a dried particulate form by spraying the feed into a hot drying medium [Masters, 1985]. This is an ideal process where the end-product must comply with precise quality standards regarding particle size distribution, residual moisture content, bulk density, and particle shape. It involves the atomization of a liquid feedstock into a spray of droplets and contacting the droplets with hot air in a drying chamber. The sprays are produced by either rotary (wheel) or nozzle atomizers. Evaporation of solvent of matrix liquid from the droplets and formation of dry particles proceeds under controlled temperature and air flow conditions. 

The unit weight of the bulk solid indication of flow use for feeder and hopper sizing compressibility determination possible compressive strength. Usually decreases with increasing moisture content. 

The upper part of the reactor pressure vessel houses the water-steam separation facilities. In the moisture separator, the bulk of the water is removed from the steam flow by centrifugal forces down to a residual moisture content of < 10%. 

---