Materials Handled

Bulk Solids Materials & Characteristics

Our original page had lists of the materials Trantec has successfully dosed going back to 1997. Over time this list has grown extensively and become difficult to utilise, primarily since some products are known by different names but are the same material.

Instead, we have produced an overview of typical material properties, including some of the popular bulk solids handling terms and powder characteristics which are the most useful when considering how a particular product will behave.

Here are some key material types which can be handled successfully in Trantec dry material feeders.

Bulk Density

Bulk density is the mass of bulk solid that that can be fitted into a defined volume. For example, how many Kgs can be accommodated in a hopper of one cubic metre.

The manner in which the product is loaded into such a hopper and what the material is subjected to, can have a significant bearing on the bulk density. In laboratory conditions, three classes of bulk density are widely recognised:

Aerated: Powder volume is increased by adding air to the point of almost destroying the bulk.

Poured: Powder is poured into the receiving vessel from a specific height and rate.

Tapped: Powder is densified by “tapping” the receiving vessel to reduce voids within the material.

Angle of Repose

The maximum angle from the horizontal, where a bulk solid remains in place. The angle formed when a bulk solid is “poured” steadily to create a “mountain shape.”  This angle is a good indicator of the degree of flowability in the material.

Free flowing products produce a small flat-shaped peak while cohesive materials create tall, sharp profiles with high angles of repose.