What is pneumatic conveying? Describe positive pressure conveying and negative pressure conveying of granular materials.

Pneumatic conveying is a widely used method in food processing and engineering for transporting granular or powdered materials from one location to another through a closed pipeline system using gas (typically air) as the conveying medium. It offers several advantages, such as minimizing contamination risks, reducing product loss, and enabling automation. There are two primary methods of pneumatic conveying: positive pressure conveying and negative pressure _______ ____ ________ __________ __________.
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