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In this process the primary powder particles are compressed into large flat tablets or pallets using a tablet press or, more commonly, a large heavy-duty rotary press. The resulting compact is then milled using a hammer mill or other conventional milling equipment. Milled slugs are passed through a screen of desired mesh for sizing. Lubricant is added in the usual manner, and the granules are compressed into tablets.
Slugging produces substantial amounts of dust which poses a problem for good control and reduction of cross-contamination. Other major drawbacks of slugging include batch processing, low throughput (30-50 kg/hr), poor process control, frequent maintenance changes and poor economies of scale. The method is being replaced by the more modern, and better, roller compaction process.
