During the dry granulation process, you may encounter some problems and it may fail to make high-quality particles. Then, there’re some points you need to pay attention to before starting to make pellets.
Successful compression depends on the compatibility of the raw material. If the materials are not fully granulated, the roller may contain too many fines. Such conditions can contribute to coverage, cutting, weight, and hardness problems.
It is common to sift large amounts of fines in roller compaction and how well you can manage this depends on the nature of the raw material.
Since you need to use powder to make particles, the process may be heavily dusty. Therefore, be sure to choose a dry granulation machine that adheres to international requirements.
Whether you can make pellets or not depends on the moisture of your powder. For the moisture will influence its flowability. Mostly, moisture between 2% and 5% is appropriate. If the moisture is too low, particles are hard to form. If the moisture is too high, it tends to cling to the roller or form slugging.