The aperture of the pellet mill die used for cat litter pellet is usually between 1.3 to 3.0mm, because cat litter is cold pelleting ,so compression ratio is low (it’s about 1:3 – 1:5). Hanpai ring die holes are arranged neatly, the hole surface is smooth as a mirror, the discharge is smooth and full, the production efficiency is increased by more than 30% compared with peers. In order to control the uniformity of blank internal material