Grouting is a molding method widely used in sanitary ceramics technology. Today we will talk about its grouting method.
Conventional grouting method：
Single-sided grouting: The contact between the mud and the model is only one side, which is called single-sided grouting.
Double-sided grouting: The mud is in contact with both sides of the working surface of the model and the core, and both sides absorb water, which is called double-sided grouting.
Improved grouting method：
1. Pressure grouting. For large-scale products, because the product is large, the grouting time must be very long, and because of the thickness of the injection part, when the water absorption capacity of the plaster mold is not enough, it is not easy to dry up. After the excess mud is poured out, sometimes the inner wall of the injection part still remains. Very wet, the injection parts are easily damaged. In order to accelerate water diffusion, speed up slurry absorption, increase the density of injection parts, shorten grouting time, and avoid the phenomenon of material shortage in large or special-shaped injection parts, the slurry must be injected into the gypsum mold under pressure. The general pressurization method is to raise the grouting bucket, increase the grouting pressure, or press the mud into the model with compressed air.
2. Vacuum grouting. The mud generally contains a small amount of air, which will affect the density of the injection and the performance of the product (such as mechanical strength, electrical properties, etc.). For products with high quality requirements, the mud should be vacuum treated to remove the air contained, and sometimes the plaster mold can be poured in a vacuum chamber. These methods are called vacuum grouting, which can accelerate the formation of the green body and improve the quality of the green body. Density and strength.
3. Centrifugal grouting. To improve the density of the injection, remove the air in the mud. The mold is rotated, and after the slurry is injected into the cavity, a very dense dry layer can be formed due to the centrifugal force. For the air bubbles contained in the slurry, because of its lightness, when the mold rotates, it is concentrated in the center, and then bursts. The plaster mold is placed on the base of the centrifuge, and a layer of plastic cloth is lined between the plaster mold and the base to prevent the mud from leaking, and a layer of cloth is placed under the plastic cloth. There is a recess in the middle of the base to scoop out excess mud after pouring. It can speed up the suction speed and avoid mud sedimentation.