What is the reason for the cracking of the ceramic cup embryo body?

Reasons for the cracking of the ceramic cup embryo body There are 7 main reasons for the cracking of the ceramic cup embryo body edge as follows: 1. The drying speed is too fast. 2. The rim of the vessel is too thin to withstand external forces. 3. If a ceramic cup has just been made and cracks begin to appear before any important drying stage, it may be that the mud has been used too many times. It is also possible that the additional filler (clinker or sand) in the mud is excessive. Sometimes, the recycled or re-allocated mud may become unusable because it has been used too many times, for example Mud that has been repeatedly drawn on a drawing machine. 4. When glazing the ceramic cup body, when it encounters the bonding part with too large thickness gap, it is easy to cause the thinner part (usually the mouth edge of the booklet) to be too wet, and these parts will be dried later in the process Withstand the intrusion of external forces. 5. When the dried body is placed in a humid environment, the body will absorb water again. This phenomenon is quite special. I have personally seen an example in which a semi-dry body absorbs water again, and when the body softens to a certain degree, it is crushed by its own weight. When a dry body is placed in a humid environment, the body will expand while absorbing moisture again, which will form a tensile force in the part with a large thickness difference in the later drying process. Those ceramic cup blanks with relatively small clay content, such as some low-temperature white clay and porcelain white porcelin dinnerware clay, have too low green strength to withstand the tensile force generated during the re-absorption process, and many small cracks appear, and these small cracks are only It can only be seen after unbaked. 6. One of the most common reasons is improper trimming. The trimming tool must be very sharp and can only be cut or shaved after the blank is half-dry. When the green body is too dry, its strength is very weak. In this case, when the green body is repaired, the green body is easily cracked by the repair tool. As mentioned in the previous article, small cracks on the outer surface of the blank will double the pressure. Generally speaking, after the trimming is completed, the outer surface of the billet is wiped smooth with a wet sponge, which can effectively prevent cracking. 7. In the field of ceramic industrial production, the cracking method on the edge of the plate is called 'bird's beakPut the dry or nearly dry plate on the electric turntable, and trim the edge of the plate at an appropriate angle with the help of an 'L'-shaped trimming knife. If the angle of the contact part between the trimming knife and the blank body is not appropriate, the knife edge will jump quickly and collide or strain the outer surface of the vessel, and the resulting cracking will appear after firing.

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