Infiltration of ink in the production of polished tiles

2018-05-18 00:10 admin
This year's Guangzhou Ceramics Industry Exhibition, the penetration of ink is in full swing. In addition, the production of polished tile products using the penetrating ink infiltration process has become increasingly mature. In view of the current recession in the ceramic tile market, the competition between polished glazed tiles and polished tiles has also intensified. From the perspective of market prospects, the author believes that the sudden emergence of ink-soaked polished bricks will inevitably surpass polished glazed bricks and micro-polished tiles as the domestic ceramic tile consumer lead.
Glazed tiles are sought after because of their simple production process, low investment costs for the entire line, and relatively low production costs. The color of the product is also welcomed by the market due to the colorful design of inkjet printers. The disadvantages are: the hardness of the product is low (below 5 degrees Mohs), the wear resistance is low, and the service life is 5-8 years. At present, the reason why polycrystalline fine-powder polished tile still occupies a certain market is due to its simple and smooth color tone, high product hardness (more than 7 degrees Mohs), good wear resistance, service life is as clean as 20 years; its Disadvantages are: large investment area, large investment in equipment, complicated production process, and difficulty in production control. Due to a serious surplus in output and a substantial reduction in profitability, investors have also greatly reduced their interest in investment; polycrystalline micro-powder polished tiles are on the market. The variety of colors is mainly light, and retro architecture and heavy art decoration are difficult to exert. The rise of the ink-soaked polishing bricks just resolved the defects of the polished glazed tiles and the polished tiles, inheriting the absolute advantages of the two series of products: First, the penetration of ink is suitable for the production of inkjet machines, the status of multi-channel, multi-spray head equipment , To solve the manufacturing defects of the polished brick dark products, enriched the types of color of the polished tile; Second, the product's Mohs hardness ≥ 6 degrees, to solve the low hardness of the polished glazed tiles, poor wear resistance defects, the service life of up to 10 More than three years; Third, the use of a cloth, to improve the product press molding speed, reduce the cost of large-scale, ultra-multi-press investment; Fourth, because of its rich colors, three-dimensional sense, adapt to the requirements of many types of decorative effects Enhance market resilience.
Although inkjet tile is the development trend of the tile market in the future, it is the mainstream, but many problems in actual production and application are required to be solved:
First, the penetration depth of penetrating ink.
1. The average vertical penetration depth of penetrating ink currently developed by the market is 0.6-1.0 mm. According to the specific requirements of the polishing process of the polished tile--smoothing and polishing, the polishing depth of the polished 800x800mm tile product is 0.8-1.2mm. Due to a variety of factors, the kiln is subject to certain fluctuations during the actual production management and control process. The flatness of batch products will also vary with the fluctuation of the kiln. If the polishing depth of the immersion polishing bricks is controlled according to the processing technology standards of the polishing bricks, then there will be batches of defective flowers and poor bleedout. , or the quality of products such as bleed yin and yang.
2. In order to stabilize the flatness of the product in the firing process, such as the kiln flatness of the ink jet polishing tile is controlled according to the standard of the polished glazed brick, that is, the flatness of the 800x800mm product is controlled at the diagonal lower bend ≤ 0.8mm, unilateral bending ≤ 0.5mm, warping angle, concave edges are not allowed. So in order to obtain the corresponding control standards, the necessary means is: a thicker blank thickness, increase the density of the blank to ensure product flatness, but the increase in the density of the blank after the penetration of the penetration of the ink further difficult Large, the penetration effect is still not ideal.
3. There are ink-jet ink business proposed that its penetration depth in foreign production experiments reaches 3mm, but when the penetration depth is too large, the ink will produce a certain degree of penetration gradient at different levels, and the polished product will still be at a certain degree. There are defects such as uneven pattern. In addition, China's polished brick kiln production line in the current design Jun to the direction of more than 400 meters, then in the case of high output, fast, the original ink penetration depth will be greatly reduced.
Therefore, in the actual production management and control, the vertical penetration depth of the penetrating ink should still be 1.2-1.5mm as the control standard, and its surface expansion force is also maintained within the range of uniform pattern diffusion to maintain stable product quality under high yield. In my opinion, in order to maintain the good permeability of penetrating ink, it is recommended that a certain amount of penetration aid be added to the production to solve the penetration depth problem.
Second, the body crack problem.
In recent years, several companies have started to try to produce inkjet polishing bricks. According to the feedback from the production frontline, the cracks in the blanks of this type of product are relatively common, sometimes up to 40% of the batch product. Such cracks are filament cracks that are difficult to see with the naked eye. Only after finishing the polishing, are they met at the product level division? The glare on the side of the thin tubes can be found, and the filaments are cracked on more than a dozen places on one tile.
The objective analysis of the cause of the crack of the blank: First, the penetration of the penetrating ink in the penetrating process is poor in uniformity, the surface diffusion force is not very even, resulting in fine cracking when the drainage is inconsistent in the firing process; Second, firing The water content of the kiln entering the kiln is relatively large: Under normal circumstances, the water content of the blank entering the kiln is controlled below 1.2%. If it is too large, cracks will occur. In order to solve this crack in the production process control, it is still necessary to add an appropriate amount of penetration aid to the glaze line to enhance the vertical penetration depth of the infiltrated ink and the uniformity of the surface diffusion force. In addition, in order to ensure that the moisture entering the kiln meets the production process requirements To completely solve the fissure of the filament, it is recommended to add a dryer before the kiln.
Third, production quality and production costs.
The reality of the ceramic industry in China is that the current product inventory is large, and all kinds of products are highly competitive. With the increasingly mature production technology and increasingly advanced production equipment, large-scale production is an inevitable trend in China's ceramic production, and raw material costs, fuel costs, production control costs, etc. must be included in the basic tasks of new product development. Although the ink seepage polished tile products have good market prospects and attractive profit margins, with the surging production of such products, the market competition will remain fierce. Therefore, all kinds of cost control problems have to be in actual production. Consider comprehensively.
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