7 situations and causes of cracks in daily ceramic tableware

7 situations and causes of cracks in daily ceramic white porcelin dinnerware. Cracks refer to the pattern defects formed by the cracks of the product tires and glaze. The following is the location where the crack occurred. Describe the main causes of various cracks. 1. Spalling Spalling refers to the delamination phenomenon of the carcass to produce cracks. The middle layer of the green body formed by grouting is also called heavy skin. ① The blank itself contains air and there is an interlayer. ②Improper forming operation. 2. A crack in the mouth refers to a crack in the mouth of the product. ① The plasticity and bonding of the mud are poor; the moisture content is too low or uneven. ②The temperature of the roller head is too high during hot rolling forming; the cutting edge is not smooth and clean during spinning and rolling forming, and there is residual mud adhered to the edge of the green body, which makes the edge of the green body dry and shrink unevenly. ③During grouting, the performance of the mud is poor; the plaster mold is too dry or the mouth part absorbs water too fast. ④The demoulding is too dry or too late, and the doubling operation is improper, causing damage to the edge of the green body. ⑤ When trimming, applying glaze, decorating under the glaze, and taking the glaze, the edge of the body is too thin, not dry, not placed smoothly, improperly operated, and excessive force is used to damage or damage the body. When loading the blank, take the blank with one hand and break the blank with your thumb. ⑥The machinery and equipment are not well-developed. The vibration is large. 3. Bottom crack Bottom crack refers to the bottom crack of the product. ①During spinning and rolling forming, the mud material is too hard or the moisture is uneven; the material is added after the material is not enough; the mud is not correctly poured; the pressing action is too strong. ②In the process of semi-finished product processing, the blank body is too wet, the area of u200bu200bthe blank suction device used is too small, and excessive force is used when sucking and placing the blank. ③When digging the bottom, the mechanical equipment vibrates and the green body is unbalanced in force, causing cracks on the inner surface of the green body, or the cracks are long in the inner surface and short in the outer surface, and the green body is sunken inward. 4. Shoulder cracks Shoulder cracks refer to the cracks on the shoulders of the product. ①The blank has poor plasticity and bonding, which makes the body low in dry strength; the moisture content of the blank is too low; the mud throwing position is not correct during forming. ②In the process of semi-finished product processing, when the blank is placed on the blank holder, the shoulder of the blank is bumped; the diameter of the blank holder is too large, too small or its shape is not suitable for the blank ③When the blank is sucked by the suction device, the pressing force is too strong Or the blank is not firmly sucked, and the blank falls accidentally, damaging its shoulder. 5. Cleft sole refers to the cracked sole of the product. ① The water content of the mud is too low, and the plasticity and bonding are poor; when forming, the diameter of the mud cake is too small, the mud throwing position is not correct, and the forming pressure is too large. ②The drying time of the belt mold is too long, and the demolding is too late, and the green body cracks in the bottom foot of the model; during demolding, the foot is sticked to the residual mud in the vent hole of the model, causing the bottom foot to crack. ③Improper operation of digging the bottom and taking glaze; the knife is not sharp; the force is too strong or uneven; the mechanical equipment used vibrates, causing the bottom of the body to be hit and injured. ④ When grinding the grey cloth, improper technique, too much force on the base plate of the finger will damage the body, and the cracks are generally from the bottom of the foot to the shoulder. ⑤There is too little bottom burning powder for large products, which will affect the shrinkage of the green body during firing, and make the green body sinter and shrink unevenly. 6. Mouth and ear cracks. Ear cracks refer to the cracks at the joints of the mouth, ears, and attachments with the main body. ① The main body of the bonding part is too thin or too wet; the moisture content of the mouth, ears, and the main body is too different, or the shape of the joint does not match; or the biscuits of the accessory and the main body are different , The water absorption rate is different. ②The bonding mud formula is improper and the viscosity is poor; the bonding mud is not well prepared and the moisture is too low. ③Unskilled bonding technology, too strong or too light when bonding, so that the bonding mud around the mouth, ears, and handles will be sprayed unevenly or not sprayed out, resulting in insecure bonding; bonding the spout , Excessive force when applying mud, etc. will damage the bonding parts; during bonding operation, the green body is incorrectly taken and placed, causing the body to be affected. 7. Eye cracks Eye cracks refer to the partial formation of cracks around the leaking holes of pot products, or the cracks on the edges of the delicate eyes. ① The mud has poor plasticity and bonding, and the dry strength of the green body is low. ②Punch holes when the water content of the body is too low; the punching machine itself is defective, the punching tube does not meet the requirements, the punching equipment is not sharp, and the punching is too strong

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