Learn Edge runner mill principle, construction, working, uses, merits and demerits. It is also known as a runner mill or roller stone mill.
What is Edge runner mill in pharmacy?
It is a type of equipment used for the mixing, grinding and homogenization of various pharmaceutical materials.
This mill commonly used for size reduction of particle.
Edge runner mill principle
The principle of edge runner mill is straightforward. It involves two large circular stones that rotate in opposite directions.
As these stones rotate, they crush, grind or mix materials that are placed between them. The gap between these stones is adjustable.
So, the size reduction is done by crushing or compression by the help of heavy weight stones. During the movement of the stones, shearing force is also applied.
Construction
- It consists of two heavy rollers.
- These rollers move on a stone or granite bed.
- Rollers are mounted horizontally and can move around the bed.
- Each roller rotates on a central shaft.
Working
- Material placed under the stone wheel using a scraper.
- Stone wheel rotates on its axis, reducing size by shearing and crushing.
- Material allowed to rest for a while.
- To achieve the desired powder size, pass it through a sieve and collect the result.
Uses
- Reducing the size of tough solid materials.
- Suitable for extracting medicinal plants.
Advantages of Edge Runner Mill
Low Maintenance: Requires minimal attention during processing, making it relatively easy to operate.
Versatile: Suitable for processing a variety of materials, including tough solids and medicinal plants.
Size Reduction: Effectively reduces the size of solid materials.
Disadvantages
Incompatibility with Sticky Materials: Not suitable for processing sticky or adhesive substances.
Time-Consuming: The operation can be slow, making it less efficient for high-volume production.
Space Requirements: Requires a relatively large amount of space, which may be a limitation in some settings.
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