Designed for low-impact blending, vertical blenders from Charles Ross & Son Co. feature a conical vessel and slow-turning screw that thoroughly agitates a wide range of materials, including powders, granules, pellets, fibers, slurries and pastes.

The screw turns on its own axis while being rotated around the vessel by an orbital arm. Batch materials are lifted to the uppermost level of the cone, then cascade slowly down in regions opposite the moving screw.

The blenders are available in sizes from 1 through 500 cubic feet.

The company is based in Hauppauge, N.Y.