So in order to feed puffer can be a long period of stable production, it is recommended that the formula does not contain fluff, hair, skin, cotton raw materials and other raw materials containing special fibers that are not easy to meet the requirements of crushing, and crushing fineness of raw materials to reach 100% over 80 mesh sieve is better, the minimum should also be up to 98% and sieve on the largest particles of the material particle size shall not exceed 0.3mm.