The emergence of ceramic inkjet printing technology makes the homogenization of products easier and easier. A single inkjet tile product is easy to imitate, and it takes a certain time for the polished tile or microcrystal to be copied. The polishing in Foshan area Bricks have been famous all over the world. With the positioning of the Foshan headquarters economy, a large number of ceramic factories have moved out, and polished brick technology has also developed in other production areas. As a porcelain piece, especially some relatively high-end products, basically based on the zirconium white glaze roller products, now the addition of ceramic inkjet technology makes the product grade further improved, and some manufacturers are traditional On the basis of the screen technology, the addition of the inkjet process also brings new life to the old products.
In Shandong and Sichuan producing areas, there are often quality problems similar to the yellowing of zirconium white glazed tiles, but it is rare in Foshan production areas. The reasons are as follows: First, the Foshan production area is high-grade in antique and polished tiles. The main factors are the floor tiles; secondly, the hard indicators of technical accumulation and production technology in Foshan production area are better than other production areas, especially some enterprises have done a good job in raw material standardization. Using dialectical methods to analyze, if under the same conditions, the technical parameters have not changed, the quality problems in the production of ceramic products are mostly caused by unqualified raw materials.
At present, most of the newly built kiln and production line equipment have been automated, but the various mineral raw materials required for ceramic production are constantly changing. Ceramic tile production is a complex system engineering, each link will have an impact on the final quality of the product, from the crushing of the raw materials to the forming, to the later glaze firing, as long as one condition changes in each link, It may cause quality problems to occur.
In my opinion, the problem of yellowing around the white glazed white brick can be solved from the following aspects.
(1) Kiln:
There is a proverb in the ceramic industry: "born in the kiln, died in raw materials." Calcination is a complex physical and chemical change process that requires strict control. The influence of kiln atmosphere on ceramic tiles is mainly manifested by partial immature glaze, or the color tone is not pure; the temperature of the kiln is not normal, which easily leads to glaze defects, such as burning, pinholes, and non-coloring. When the slab is not sufficiently oxidized, serious problems such as glazed air bubbles, pinholes, and even brick surface deformation may occur.
The yellowing around the white brick has a certain relationship with the atmosphere of the kiln. Nowadays, most ceramic manufacturers use water or natural gas as fuel. Water gas or natural gas is cleaner than heavy oil, and the fuel source is very stable, which is beneficial to the control of furnace temperature and atmosphere. Secondly, the use of white glaze is very small, especially the roller process is very thin, and many manufacturers' products are directly white glaze without any flower glaze, so the yellowing is more obvious.
(2) Glaze:
Glaze is one of the most common sources of quality accidents in the daily production of ceramics manufacturers. Quality problems caused by unqualified chemical raw materials often occur in production. For example, if the water reducing agent fails, the slurry pool is gelled, and the color material is unqualified, resulting in black hearts. Unqualified printing powder leads to sticky stencils and the like. Under the premise of not changing the process, the white bricks appear in the surrounding yellowing phenomenon at different time periods, which is likely to be a problem of glaze slurry. For example, in the zirconium white frit, since the raw material contains iron too high, a yellow tone is generated after calcination. Therefore, the bottom glaze and the glaze should be separated for comparative tests to find out the quality problems of the two glazes. Secondly, the fineness of the glaze will have an effect on the glaze, and it is necessary to find out whether there is a quality hazard in the glaze ball milling.
It is worth noting that if there is a quality problem with the glaze, it usually shows that the entire brick surface is yellowed, or the middle surface is not obvious, and there is a tendency to increase in the surrounding area, and the same phenomenon occurs in the entire batch of products.
(3) Production process:
Since the process links are generally fixed, they are easily overlooked in production. At one ceramic manufacturer, there was a quality problem caused by the misplacement of the stencils. The white glazed surface is yellowed, and there is a case where the glaze on the edge of the brick is thick. The specific gravity and flow rate of the glaze directly affect the covering effect of the glaze of the brick. When the process between the bottom glaze and the glaze does not match, it is easy to accumulate the glaze or the bottom glaze to the edge of the brick, resulting in the edge of the white brick. The center position is yellowish. At this time, it is recommended to increase the specific gravity and flow rate of the glaze slurry to speed up the drying process of the brick, and the production is generally adjusted by adding clay. [Follow the WeChat public number "Jiuzheng Ceramics Network" ; pay attention to surprises, scan the code to read "Amazing social laws, no time to watch several times" wonderful content! Jiuzheng Ceramics Network Exchange Group: 80123558 】
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