The ceramic tableware manufacturer tells you the main cause of the edge cracking caused by the ceramic embryo body

The ceramic tableware manufacturer tells you that the main reasons for the edge cracking of the ceramic body include the following. 1. The drying speed is too fast. 2. The rim of the vessel is too thin to withstand external forces. 3. If a ceramic vessel has just been made and cracks begin to appear before it has experienced any important drying stage, then the mud may be used too much. It is also possible that the additional filling (clinker or sand) in the mud guessing is excessive. For some time, the mud that is recycled or re-used or re-allocated from scratch will become unusable because it has been used too many times, for example, The mud that has been repeatedly drawn on the drawing machine. 4. When glazing the ceramic body, when encountering a thick joint part with too large distance, it is easy to cause the thin part (general mouth edge) to get wet, and these parts will be affected by external forces in the later boring process. 5. When the dry body is placed in a humid environment, the body will absorb water again. This phenomenon is very special. I saw with my own eyes a semi-dry body absorbing water again. When the body softened to a certain extent, it was crushed by its own weight. When a dry billet is placed in a humid environment, the billet will expand while absorbing moisture again, which will form a tensile force in the part where the thickness is larger during the later drying process. Those ceramic blanks with relatively low clay content, such as some low-temperature white pottery clay and porcelain white porcelin dinnerware clay, have too low green strength to withstand the tensile force generated in the process of re-absorption, and many small cracks appear, and these small cracks are only in It can only be seen after unbaked. 6. One of the common reasons is improper trimming. The trimming tool needs to be very sharp and can only be cut or scraped after the body is half-dry. When the body is too dry, its strength is very weak. In this case, the body is easily torn by repaired things. As mentioned in the previous article, small cracks on the outer surface of the blank will double the pressure. Generally speaking, after the blank is repaired, the outer surface of the blank is wiped smoothly with a wet sponge, which can effectively prevent cracking. 7. In the field of ceramic industrial production, the cracking method of the beak on the handicap is called the cracking method of the bird's beak, and the reason is improper repair of the blank. Put the dry or nearly dry plate body on the electric turntable, and use an 'L'-shaped trimming knife to trim the edge of the plate from an appropriate point of view. If the view point of the contact position between the trimming knife and the blank body is not appropriate, the knife edge will jump quickly and bump or strain the outer surface of the vessel, and the resulting cracking will appear after firing.

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