The coagulation effect of soybean milk made from different angles is different. A small amount of soybean milk and gypsum solution used for pulp washing should be washed down at the angle of15 ~ 35 under the wall of the container for soybean milk (wide-mouth glazed tile cylinder). Gypsum solution can accurately flow down the cylinder wall and rush into the bottom of the cylinder, so that the washed soybean milk can be reversed, all of which can be reversed and mixed evenly with gypsum. When the stopping time of turning soybean milk is basically equal to the time of coagulating soybean milk with gypsum, the coagulation effect is the best.

Part of the gypsum solution washed at an angle less than15 will rush out of the container, the impulse will be weakened, the dosage of gypsum will be reduced, and the curing will be incomplete. Gypsum rushed in at an angle of 40 ~ 50 degrees splashed around due to the reaction force of the wall, and most of it was knocked back and swayed in the middle and upper layers of soybean milk. Only a small amount of gypsum solution rushed into the bottom, and the impulse was too small to turn up the soybean milk at the bottom, so the gypsum mixed unevenly and sank, the bottom layer was too high, the middle layer was moderate and the upper layer was incomplete.

When washing the pulp at an angle of about 60, the gypsum solution is completely distributed on the surface of soybean milk after hitting the wall, and there is no impulse at all. Soymilk does not turn over, gypsum is partially concentrated, forming a paste, partially caking, and most of it is completely coagulated, and the effect is very bad. If the angle is larger, the pulp won't come up. At the beginning of slurry flushing, the angle should not be greater than 35, and finally gradually decrease to not less than15.