The difference between ceramic rolling and grouting
2025-12-28
The core difference: The forming principles are different
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Rolling forming
It belongs to mechanical forming. By using a rotating roller head to "roll" and "press" the clay, the clay is formed in one go. It's like rolling dough into a thin pancake with a rolling pin, but the process is high-speed rotation.
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Grouting molding
It belongs to the grouting method of molding. By taking advantage of the water absorption of gypsum molds, flowing slurry is injected into the molds. After the water is absorbed by the gypsum, the slurry forms a blank on the inner wall of the mold. Just like "grouting" a plaster mold, the mold is removed after the slurry solidifies and takes shape.
The applicable products are different
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Rolling forming
It is suitable for making regular-shaped and symmetrical vessels, such as plates, bowls, cups and saucers, and other daily-use ceramics.
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Grouting molding
It is suitable for making complex-shaped, irregular, thin-walled or large-volume products, such as vases, teapot handles, sculptures and other handicrafts.
The characteristics of the finished products are different
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Roll forming
The finished product has a dense structure, precise dimensions, a smooth surface and uniform thickness. Because it is mechanically pressed, the regularity of the finished product is very high, achieving a "seamless fit" effect.
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Grouting molding
The green body structure is uniform, but the moisture content is relatively high and uneven, and the shrinkage is relatively large during drying and firing. There may be marks left on the inner wall due to the gypsum mold absorbing water, or there may be circular concave points on the inner wall of complex parts (such as the handle of the pot).
How to distinguish?
If you want to distinguish the craftsmanship when choosing a purple clay teapot or ceramic cup, you can take a look at these details:
Check the inner wall: The inner wall of a rolled or motorized pot is usually very clean and regular, and there may be no trace of handwork. However, the inner wall of the grouting pot may have circular concave points or inconsistent textures.
Look at the seams: The body of a pot formed by rolling is usually integrally formed, and the texture of the bottom and the inner wall of the pot will be relatively consistent. However, when the components formed by grouting (such as the spout and handle) are reassembled, there may be a difference in texture from the body of the teapot. Look at the regularity: The finished products formed by rolling have extremely high regularity. For instance, the cut lid teapot can achieve a perfect fit between the lid and the body, which is an advantage of mechanical craftsmanship.