Dry Compaction

Dry granulation is commonly used in many industries to alter the particle size and bulk density of materials.  Alexanderwerk has the equipment focused on customer demands and industry requirements for the Pharmaceutical, Chemical and many other industries.

The theory of roller compactor technology takes the light small powder from a feed hopper and introduces it to a feeding system (feed screw). The feed screw precisely meters the material into a set of counter rotating rolls that compress the ribbon into a solid long flake.  The flakes are then gently milled to the required particle size.

Replacing traditional wet granulation methods, roller compaction technology has several advantages by using the dry process, including speed of processing, lack of moisture introduction, precise control of the particle size faster process times, considerable less capital investment and considerable savings in energy consumption and floor space.


The three major components to the base systems include:

Feeding System

The horizontally oriented feed system has the ability to de-aerate, pre-compress and precisely meter the feed material into the rolls.  


Two counter rotating rolls compress the powder into a solid flake.  This flake has a considerably higher bulk density than the starting material.  


The solid flakes are then gently granulated through a flake breaker and subsequently a set of gently granulators.  This multi-step process ensures a minimum amount of fines are generated in this process.