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Humidity Control for Pneumatic Powder Conveying Humidity / Moisture Control is a critical element for various forms of powders such as fine salt, detergents, flour, powdery foods, calcium phosphate, baking powder, wheat starch, plastics resin etc. Pneumatic conveying as a means of powder conveying system is widely used in many powder processing operations such as in handling transfer of food powders, flour in a mill, bakery or confectionery. Due to the stickiness nature of the hygroscopic powders, they get stuck into nozzles, conveying belts and mixing machines leading to increased maintenance time and bad hygiene. Stickiness – Powder gains properties of adhering or sticking to a surface and get stuck into conveying belts causing bad hygiene which ultimately leads to deteriorating of product quality. Cluster formation – Due to excess moisture similar particles of powder gather closely together forming buildups inside the mixing machine and causing blockages in free flow of powder. Lump formation – A large piece of powder sticks together without a definite shape causing obstruction in the nozzle passage and increasing the maintenance time. Caking – Moist environment forces powder to change into a solid mass which leads to increase in product wastage and slowing down of production process. Food powder processing In order to retain quality of powdery foods, they need to be dried at low temperatures. Applications Temperature (°C) Humidity (% RH) Instant Coffee Processing 26 25 Flour 24 10 Starch 24 20 Gelatin 24 10-30 Milk Powder Storage 21-36 15-30 Confectionary-Chocolate Covering 21-32 45 Coffee Packaging 18 40 Dry Spice Conveying <48 12-16 Gr/Lb Hygro Tech Engineers having a complete solution to treat the moisture problems with Hygro Dehumidifiers & drying chambers for all powder conveying, packing, storage
Moisture Control in Powder Food Powdered foods like juice concentrates, whey powder, protein supplements, soup powders, cocoa, gelatin, dehydrated soft drink concentrates, instant coffee powders and milk powders are gaining popularity in the growing world. The presence of moisture during processing of food powders and beverage powders causes: Stickiness, Lumping and caking, Cluster formation, Reduce shelf life Recommended RH for Powdered Foods Food Powder Temperature in ºC RH % Instant Coffee Processing 26ºC 20% RH Fruit Powder Handling 20°C – 22°C 35% RH Tomato Powder Production 19°C – 23°C 25% – 35% RH Dry Soup Packaging 21°C 20% RH Powdered Drink Mix Packaging 21°C 20% RH Cooling of Spray Dried Milk Powder 10°C 35%- 40% RH Milk Powder Packaging 22°C– 25°C 35% – 40% RH Whey Powder Manufacturing/Storage 21°C – 26°C 15% – 30% RH Hygro Tech Engineers has a complete turnkey solution in treating moisture problems for powdery products. for more details please contact www.hygrotechindia.com / 9886144100
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