Xinxiang Ceramic Mug Manufacturer,  For customised ceramic coffee mugs, we usually go through professional ceramic production factories. However, some customised ceramic mugs have problems, if the buyer can understand some of the reasons for the defects of the ceramic mugs, then the communication between the two sides will be more convenient and accurate.

1. Deformation

The shape of the ceramic mug presents a shape that does not conform to the specified design.

2.Falling slag

Ceramic mug glaze inside the cinder, mostly ceramic cups in the glaze into the kiln, adsorption of cinder. After firing, the grey residue is combined with the glaze, and there are obvious bumps and sharp edges when touched by hand.

3. Pores

Ceramic mug glaze appeared small holes, similar in shape to a pinhole. Ceramic cup pores formation reasons: a). Ceramic mug in the firing process there are carbon particles deposited in the glaze, in the high temperature firing, carbon particles are burned off, the glaze will leave a dent, this and the difference between falling slag is: carbon particles of small particles, burned out in the firing process. b). The surface quality of the blank is not good, the glaze Viscosity is too high, poor fluidity, can not make up for the defects on the surface of the blank, resulting in pinholes. c). Too fast heating during firing, the glaze is not fully fused will also cause the phenomenon of pores.

4.Spot

Coloured stains appearing on the surface of ceramic mugs, which also become black spots.

5. Colour dirty

Ceramic mugs appear on the surface of the phenomenon of miscellaneous colours that should not be there.

6. Bumps

Ceramic mug body with the hand can feel the obvious bumps, bumps part of the corners of the rounded, smooth surface. This situation is mainly billet in the production process left behind by the residual mud.

7. Billet bubble

Ceramic mugs appear under the glaze hollow bubble. This is the glaze or the air in the middle of the blank in the firing process, was sealed inside the glaze caused.

8. Mud slag at the bottom of the mug

Ceramic mugs have tiny slag particles sticking to the bottom of the cup. Ceramic mugs have a link in the production process, grinding the bottom. Grinding in order to remove the bottom of the mug slag. Caused by the ceramic mug slag is mostly: grinding the bottom is incomplete or blank in the drying, glazing process stained slag.

9. lack of glaze

Ceramic mug lack of glaze. This situation occurs in the handle and cup body connection, the bottom of the cup, the mouth of the mug. Appearance of the lack of glaze is mostly in the glaze process operation is not in place, the glaze viscosity is too high, caused by.

10. Cracks

Ceramic mugs appear cracked. The main reasons for this situation: a). Drying too fast: blanks in the drying process if the speed is too fast, it will lead to the internal and external shrinkage of the blank is not consistent, resulting in cracks. b). Uneven glazing: ceramic mugs in the glazing process, the glaze thickness varies too much, which will cause uneven humidity of the blank, which will produce cracks in the firing process. c). Secondary water absorption: after the blank is dried, because of the climate or the weather, causing the dried blank to absorb water twice. This causes inconsistency in the water content inside and outside the blank, which will produce cracks. d). Temperature difference is too large: this situation is likely to occur in the winter in northern China ceramic factory, winter temperature is low, the blank in the firing process, the need to elongate the heating process, otherwise, it will be because the blank temperature is too low, warming up too quickly, resulting in ceramic mug cracks.

11. Baked flowers sticky glaze

Ceramic mug baking flower sticky glaze.

12. lack of clay

Ceramic mug blank mutilated phenomenon, mostly in the billet system during the production process or move in the process of bumping caused.

13. Glaze scratches

Ceramic mug picture appears stripes or points of dark wounds. This situation is mostly ceramic cups in the movement or transport is caused by external bumps.

14. Smoke

Ceramic mugs appear on the body of the grey-black or brown, such as the shape of the smoke marks. Smoke phenomenon, mostly in the firing process caused by improper operation. Specific references, ceramic mug firing technology

15. Raw firing

Ceramic mugs do not reach the firing temperature, because the water content of ceramic mugs is too high, or improper control of kiln temperature and time, and caused. After raw firing, the colour of the mug is dark, the glaze is glossy and rough, and the sound is not brittle when it is knocked.

16. Over-fired

Ceramic mug firing temperature is too high, or too long. This situation will cause the ceramic mug deformation, size inconsistency, glaze blistering or glaze flow.

To sum up, these are 16 common defects of ceramic mugs. These ceramic coffee mugs often appear defects, as well as the causes of defects. After we understand them, we can be able to control the quality of ceramic mugs easily. This will also make it easier to pick the right ceramic mug production factory.