What are the conditions for cracks in bone china cups?

Bone china cracks refer to stripe defects formed by cracks in the product’s carcass, below the location where the crack occurs.

1. Splitting is the layering of the carcass, and the middle layer of the grout-like blank is also called heavy leather.

1. The blank itself contains air and there are interlayers.

2. Improper molding operation.

2. Mouth crack refers to the mouth crack of the product.

1. The clay has poor plasticity and adhesion; the moisture is too low or uneven.

2. During hot rolling forming, the temperature of the roller is too high; the spinning pressure is 100%, and the cutting edge is uneven and unclean during roll forming, which sticks to the remaining edge of the blank, making the blank dry and shrink unevenly.

3. After the grouting is formed, the mud performance is poor; the plaster mold is too dry or the water along the mouth is too fast.

4. Demolding is too dry or too late, and the double mold operation is improper, thus damaging the edge of the blank.

5. When decorating, glazing, underglaze decoration, and removing glaze, the edge of the blank is too thin. , not dry, placed unevenly, improper operation, excessive force, injury or damage.

6. The mechanical equipment is imperfect. The vibration is loud.

3. Bottom cracking refers to cracking at the bottom of the product.

1. When rotating or rolling, the mud is too hard or the water is uneven. After insufficient feeding, the material is added and the mud is incorrect; the pressing action is too strong.

2. During the processing of semi-finished products, the blank is too wet, the area of the suction blank used is too small, and the suction blank is too strong when placing the blank.

3. When digging the bottom, the mechanical equipment vibrates and the force of the billet is unbalanced, resulting in cracks on the inner surface of the billet, or cracks appear in the form of short inner surfaces, and the billet body is sunken inward.

4. Shoulder cleft is a crack in the shoulder of the product.

1. The billet has poor plasticity and adhesion, making the dry strength of the billet low; the moisture content of the billet is too low; the position of the sludge during the molding process is incorrect.

2. During the processing of semi-finished products, placing the blank on the blank will hit the blank; the diameter of the blank is too large, too small or its shape does not fit the blank.

3. When using a vacuum cleaner to suck up the blank, if the pressing force is too large or the blank is not sucked, the blank will accidentally fall and the shoulder will be damaged.

Tangshan win-win Ceramics is a company specializing in the production and processing of dinnerware, cups, water sets, tea sets, coffee sets and other products. It has a complete and scientific quality management system. We have always adhered to the tenet of “customer first, quality first, credibility first” and the development concept of “quality is the life of the enterprise, culture is the corporate brand”, and attaches great importance to the innovative combination of traditional ceramic culture inheritance and modern ceramic culture.


Post time: Sep-15-2023


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