16 Flaws in the Making of Ceramic Coffee Mugs

Xin xiang ceramic mug manufacturer, for customised ceramic coffee mugs, we usually go through professional ceramic mug 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 coffee mugs 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:

3.1. 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.

3.2. 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.

3.3. 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:

10.1. 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.

10.2. 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.

10.3. 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.

10.4. 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 factory.

Factors to Consider for Custom Ceramic Coffee Mugs

Xinxiang ceramic mug manufacturer, ceramic coffee mugs are a kind of daily drinking utensils. Ceramic coffee mugs can be divided into many types according to raw materials, glaze, flower paper, firing, capacity, shape and colour. So, what factors should we consider when we want to customise a ceramic coffee mug? If you want to find a more suitable ceramic coffee mug for yourself, then you should understand the difference between the various factors of ceramic coffee mugs. For example, the raw materials of ceramic mugs: stoneware, ceramic, bone china and rough pottery. The flower paper and firing of the ceramic mug: low, medium and high temperature. It also affects whether this ceramic mug is dishwasher and microwave safe.

1. Raw material of ceramic mugs

The raw material for ceramic mugs is china clay. The composition of china clay is mainly kaolin, and contains feldspar, quartzite and mullite components. Knead the clay into a ceramic mug - billet.

2. Ceramic mug glaze

Glaze is attached to the surface of the ceramic blank a continuous vitreous layer, or a mixture of vitreous and crystalline layer. Modern ceramic mug production glaze is divided into lime glaze and long ancient glaze. Lime glaze is used to glaze fruit (similar to porcelain stone of a natural mineral raw materials) and grey glaze (the main ingredient of calcium oxide) formulated, feldspar glaze is mainly composed of quartz, feldspar, marble, kaolin and so on. In the lime glaze and feldspar glaze to add metal oxides, or infiltration of other chemical ingredients, it will become a variety of glaze colours.

The general thickness of the glaze is only 1-3% of the thickness of the blank, but after kiln firing, it is tightly adhered to the porcelain tyre, so that the porcelain densification, soft luster and impermeable to water and gas, giving a person the feeling of bright as a mirror. At the same time can improve the use of strength, to prevent pollution, easy to clean and so on.

There are many kinds of ceramic glaze, according to the billet class points, there are porcelain glaze, pottery glaze and flintware glaze; according to the firing temperature points, 1100 ° C below the glaze is known as low-temperature glaze, 1100 ° C-1250 ° C between the glaze fired into the glaze for the medium-temperature glaze, 1250 ° C above the glaze fired into the glaze for high-temperature glaze; glaze features classified by white glaze is probably out of the love of the silverware, the colour of the glaze is colourful with its colourful by the people! Welcome, crystalline glaze pattern variation beautiful and moving, kiln-variable pattern glaze dazzling, beautiful, crackle glaze clear and simple, elegant and chic. In addition to the above, there are no light glaze, milky glaze, salt glaze and so on.

3. Ceramic mug flower paper

Ceramic flower paper is the carrier of ceramic ink, divided into ceramic glaze decal paper and ceramic glaze under the glaze decal paper, flower paper types due to the composition of the difference.

Water shift decal paper the most basic material is a small film backing paper, it is a particularly strong water absorption, the surface is coated with a water-soluble adhesive film paper, printed flower paper soaked in water, the paper absorbs water, dissolve the surface of the water-soluble adhesive, you can make the pattern of the oil agent by the surface of the paper sliding separation, the separation of the pattern is also with a small amount of water-soluble adhesive, you can stick it on the porcelain pieces, as the name suggests, known as the water shift decal.

High-temperature paper firing temperature, generally controlled at 600 ℃ - 1000 ℃. According to the position of the glaze where the flower paper, set a different firing temperature. This firing temperature is much higher than the low temperature flower paper. Therefore, ceramic coffee mugs with high temperature floral paper are not afraid of high temperature. The firing temperature of low-temperature flower paper is around 150℃. Therefore, it can be seen that the ceramic coffee mug with low temperature flower paper is not adaptable to high temperature. If it is put into the microwave oven and heated at a high temperature, the colour of its pattern will fade or even disappear. The evaporation of the ink of the flower paper is not good for the health of our body.

4. Ceramic mug firing

Ceramic mugs can actually be divided into three kinds in the firing process. One is a single firing. That is, from the blank mud to our commonly used ceramic coffee mugs, only through the kiln calcination once on the shape. The second type is secondary firing. As the name suggests, ceramic mug blanks need to enter the kiln twice for calcination. The first is unglazed firing, usually become ‘plain firing’, the purpose is to increase the mechanical strength of the blank, not easy to damage. Often larger or thinner bone china mugs are often fired twice. After the first firing, a glaze is applied (for information on glazes, please refer to previous issues of our factory), and then a second firing is carried out. Depending on the type of mug, the material and the glaze, the temperatures of the two firings before and after are different. The third type is the triple firing, which requires three trips into the kiln. It is often required for more complex ceramic pieces. The first time is a plain firing, the second time is a glaze firing, and the third time is a decal or hand-painting followed by a firing.

5. Ceramic mug capacity

According to the different needs of use, the capacity of ceramic mugs is also different, the common capacity of 12oz, 14oz, 16oz and so on. The capacity of espresso cups is 2oz, 3oz, 4oz; the capacity of coffee cups and saucers is 6oz, 8oz; the capacity of mugs is 11oz, 12oz, 14oz; the capacity of soup cups is 20oz, 30oz.

6. Ceramic mug shape

Ceramic mugs come in a variety of shapes, the most common are cylindrical straight mugs, drum coffee mugs, tulip coffee mugs, wide-mouth coffee mugs and a variety of special shapes of coffee mugs.

7. Ceramic mug colour

Colour glaze: in the glaze with some kind of oxidation metal, after baking, it will show some kind of inherent colour, so called ‘colour glaze’. Glaze material to add different metal oxides as a colouring agent, in a certain temperature and air temperature in the firing, will show a different colour of the glaze, become a colour glaze. Traditional colour glazes include: blue glaze with iron as the colouring agent; red glaze with copper as the colouring agent; and blue glaze with cobalt as the colouring agent. Historically, there are outstanding masterpieces of colour glazes in many eras, such as the green glaze and jun red in the Song Dynasty, the ji red in the Ming Dynasty, and the Lang kiln red, wu jin glaze, and tea leaf powder glaze in the Qing Dynasty. The difference between colour glaze and ordinary colour glaze lies in the special firing process and formula of colour glaze. Colour glaze glaze, must be calcined at a high temperature of more than 1250 degrees Celsius, in order to show its light as oil, colour as rainbow haze, texture as the unique charm of the waterfall clouds.

8. Ceramic mug packaging

Ceramic mug packaging is divided into two kinds: one is a gift box packaging, more colourful boxes; the other is a security package. Gift box can not choose, however, safety packaging is a must. Because the ceramic mug from the ceramic factory production, need to be transported to the port or airport, for long-distance transport. Safety packaging is used to ensure the safety of ceramic mugs. The outer packaging is an effective way to protect ceramic mugs from damage. Usually requires the outer packaging of ceramic mugs should have a certain compressive strength and resistance to breakage strength. It can protect the whole box of ceramic mugs in the process of transport and storage, without damage.

A small amount of ceramic mugs in the packaging, and a large number of ceramic mugs packaging is not the same. A small amount of ceramic cups are mostly sample packaging. Because the samples are mostly courier channels, in the packaging of ceramic mugs, the use of high-foam polyethylene and corrugated cardboard. First of all, with high-foam polyethylene (bubble wrap) wrapped ceramic mugs, fixed with tape. The thickness of the bubble bag is required to be not less than 1 CM. multiple ceramic mugs packaging is completed, into the corrugated cardboard box.

In summary, after understanding the basics of the various factors of ceramic coffee mugs, we can determine the characteristics of custom ceramic mugs more precisely according to our needs. So that in the custom ceramic coffee mug, the more accurate and detailed information to the ceramic factory (for example: china ceramic mug factory), to facilitate the two sides with a shorter time, lower cost, to solve your custom needs.