Abstract

Dr. Malavika V. S.*, Dr. Malavi Shayan and Dr. Vikram S.

ABSTRACT

Size reduction is a fundamental unit operation widely utilized in pharmaceutical, chemical, and food industries to enhance material processing, improve bioavailability, and ensure uniformity of formulations. This paper provides a comprehensive overview of milling devices used for size reduction, detailing their principles, construction, working mechanisms, advantages, and limitations. Theoretical aspects including Kick’s, Rittinger’s, and Bond’s laws are discussed to elucidate the energy requirements of comminution. Various milling techniques—such as cutting, compression, impact, and attrition—are analyzed with representative equipment like the ball mill, hammer mill, roller mill, and fluid energy mill. The paper also highlights the Ayurvedic correlation through traditional instruments like the Khalva Yantra and Ullukala Yantra, emphasizing their role in the preparation of fine powders and formulations. Factors influencing milling efficiency - such as material properties, moisture content, temperature, and polymorphism - are examined to optimize the process. Overall, milling devices are indispensable in modern and traditional pharmaceutical practices, ensuring controlled particle size, improved therapeutic efficacy, and consistent product quality.