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Grouting process in the Hot Pressing Grouting Mold

May 04, 2018

The Hot Pressing Grouting Mold is the first step in the grouting process:


When the Hot Pressing Grouting Mold is in this stage, because of the water-absorbing effect of the plaster mould, a thin mud layer will be formed on the working surface near the model first, and then the mud layer will gradually thicken to the required thickness of the blank. At the beginning of this process, the forming power is the capillary action of the Hot Pressing Grouting Mold model. Water close to the mold wall, solute points dissolved in water, and granules smaller than microns are sucked into the capillary in the mold.


Because the water is sucked away, the mud particles come close to each other, relying on the model of the Hot Pressing Grouting Mold to attract the particles and particles to the particles, so as to form the initial thin mud layer. In addition, during the initial stage of casting, Ca2+ in the plaster mold is exchanged with Na+ in the mud, which also promotes solidification of the mud into a mud layer.


In the shaping process after the formation of a thin mud layer, in addition to the capillary force of the model, the forming power also acts to diffuse the water in the mud through the thin mud layer into the mold. Its diffusion power is the concentration difference and pressure difference of moisture on both sides of the mud. The mud layer looks like a strainer. As the mud thickens, the moisture diffusion resistance gradually increases. When the mud thickens to a predetermined billet thickness, the slurry is poured out.


The Hot Pressing Grouting Mold should also pay attention to the consolidation demoulding stage during the grouting process:


After the hot-press grouting mold realizes blank forming, it is not possible to immediately realize demoulding, it is necessary to pay attention to the need to continue to place in the mold, so that the moisture of the blank is further reduced. In general, we will actually call this process the consolidation phase.


In this process, as the model of the Hot Pressing Grouting Mold continues to absorb water and water evaporates on the surface of the green body, the water content of the green body decreases continuously, with a certain drying shrinkage. When moisture is reduced to a certain point, the rate of moisture reduction in the body will be rapidly reduced. At this point, due to the shrinkage of the blank and a certain strength, the demolding operation can be performed. The Hot Pressing Grouting Mold model was almost completed.