Hammer Mill || pharmaceutics || working principle || Trekpharma || Advantages and Disadvantages

                                                                       HAMMER MILL

 Method of size reduction: Impact

 Construction and working principle:


Hammer mill consists of a steel casing, enclosing a central shaft to which four or more hammers are attached.

These are mounted with swivel joints, so that the hammers swing out to a radial position when the shaft is rotated.

The lower part of the casing consists of screen through which materials can escape, when sufficiently size reduced.

The material is collected in a container placed below the screen.

The screen can be changed according to the particle size required.

According to the purpose of operation the hammers may be square-faced, tapered to a cutting form or have a stepped-form.

The interior of the casing may be undulating in shape, instead of smooth circular form for better impact.

The rotor operates at a speed of 80cycles per second.

 ADVANTAGES:

It is rapid in action, and is capable of grinding many different types of materials.

The product can be controlled by variation of rotor speed, hammer type and size and shape of mesh.

Operation is continuous.

No surface moves against each other so very little problem of contamination of mill materials.

DISADVANTAGES:

High speed of operation generates heat that may affect thermolabile materials or drugs containing gum, fat or resin.

The rate of feed should be controlled otherwise the mill may be choked.

Because of high speed of operation, the hammer mill may be damaged if some foreign materials like stone, metal pieces etc. are present in the feed.

APPLICATIONS:

Powdering of crystals and filter cakes.

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