Horizontal ring die is widely used in the feed industry. Materials can be fed in and out dryly, with high output. But for biomass pellets, biomass materials has a character of light specific gravity and it is difficult to press during compression molding.

Because of the horizontal ring mold rotates, the center line of the mold lies down, so the material can only be fed from the side, it will inevitably lead to unsmooth feeding and expanded material blocking.