The dry material under the bulking machine has been flowering and not forming, and no sugar is added. According to the relevant data, the dry material under the expander has been blooming and not forming because the matching diameter of the pressure ring is too small or the amount of steam added is insufficient, the tempering temperature is too low or the pressure ring or screw head is worn. It is necessary to replace a larger pressure ring or raise the quenching and tempering temperature, and the temperature of quenching and tempering materials should be between 80-90 degrees. Maintain the oil degree in the expansion cavity jacket.