So as one of the important areas of the screen printing industry, glass screen printing in the screen printing industry plays an important role?
Introduction of glass screen printing technology
Glass screen printing, is the use of screen printing plate, the use of vitreous enamel, decorative printing on glass products. Vitreous enamel, also known as glass ink, glass printing material, it is by the coloring material, linking material mixed and stirred from the paste printing material. The coloring material by inorganic pigments, low melting point flux (lead glass powder) composition; linker in the glass screen printing industry is commonly known as Lee plate oil. Printed glass products, to be put in the furnace, with a temperature of 520 ~ 600 ℃ for firing, printing to the glass surface of the glaze in order to solidify in the glass, the formation of colorful decorative patterns. If the screen printing and other processing methods and use, will get more ideal results. For example, the use of polishing, engraving, corrosion and other methods before or after printing on the surface of the glass processing, can double to improve the printing effect.
The application of glass screen printing technology
The application of screen printing flat glass and its market prospects screen printing flat glass is widely used in all corners of people's lives: you can easily find them in the display window, architectural space zoning, building exterior beautification, automobile windshields and inlaid glass and other places. At the same time . They are also widely used in furniture decoration and game tools, as well as in countless decorative and artistic creations. With this, screen printing has become a part of the creative design work of glass manufacturing. Screen printing allows one to print color images directly onto the glass surface. Alternatively, it can be used to temporarily cover unillustrated portions of the glass surface, or to print additives such as preservatives on portions of the glass surface to make it unaffected by the etching or frosting process. Comparatively, it is also possible to directly screen print specialized inks to create an etched or frosted effect. Sometimes. People also take advantage of the strong masking ability of screen printing, such as printing a thin layer of conductive material on glass for making anti-icing (frost) devices for windows.
Screen printing is expanding in the field of flat glass decoration. In addition to its applicability to a variety of substrates, another important factor is that it can meet a wide range of different sizes and weights of flat glass substrates. Moreover, due to screen printing in the ultra-large format image printing absolute advantage, more firmly it leads the whole flat glass printing industry development of the dominant position. Especially in recent years the demand for large format flat glass printing has risen sharply under the trend. In fact, due to the rapid development of screen printing in the field of large-format flat glass decoration, printing equipment manufacturers are also constantly improving to adapt to the more demanding printing requirements, especially such as flat glass and other fields, resulting in many of the world's most flexible equipment is used in a large number of architectural panels of the printing. The use of screen printing in flat glass decoration will continue to grow and expand its application areas in glass decoration. Screen printing machines have faster substrate delivery systems, as well as more advanced power delivery systems, combined with powerful PLC (logic controllable device)
In addition, the automotive industry has a strong demand for glass screen printing technology In addition to the use of screen printing of purely optical color applications, a variety of functional layers (such as the heat conductor on the rear window) have also been modified conductor pathways and optimal structures (e.g. rear window heaters) must be embossed in a consistent manner in a timely manner and in a way that ensures excellent quality.
Glass Inspection Technology Gets Attention
Another prominent feature we noticed at this year's Glass Shanghai was the extensive attention paid to glass inspection technology and equipment, especially for high-tech value-added glass screen-printed products, such as LEDs, touchscreens, and the aforementioned automotive glass, solar panels, and so on. These products have strict requirements for quality and yield, so with the development of science and technology, more and more glass screen printing enterprises began to pay strict attention to and control the quality of the finished glass products, thus making the glass inspection technology has become the glass industry and a popular field.
So on the glass screen printing technology, its processing process often appear what quality problems?
Glass screen printing process is prone to problems
Paste
1. Paste, also known as blocking the plate, refers to the screen printing plate graphic through-hole part of the printing can not be transferred to the substrate ink phenomenon. The appearance of this phenomenon will affect the quality of printing, and in serious cases will not even be able to carry out normal printing. Screen printing process of the paste phenomenon is the cause of the complexity of the phenomenon. Paste can be analyzed from the following aspects: ① glass reasons: glass surface is not clean, there are watermarks, paper prints, grease marks, handprints, dust particles and other dirt. Thus causing paste; ② workshop temperature, humidity and ink nature of the reason. Screen printing workshop requirements to maintain a certain temperature of about 20 ℃ and relative humidity of about 50%, if the temperature is high, low relative humidity, the volatile solvents in the ink will quickly evaporate, the viscosity of the ink on the screen becomes high, thus blocking the mesh. Another point that should be noted is that if the downtime is too long, will also produce paste phenomenon, the longer the paste the more serious. Secondly, if the ambient temperature is low, poor ink fluidity is also prone to paste; ③ screen printing plate reasons. The made screen printing plate before use, rinse with water and dry before use. If the plate is made and placed too long without timely printing. In the preservation process more or less will be adhering to the dust, printing, if not cleaned, will cause paste. ④ The reason of printing pressure. Printing process is too large, will make the squeegee bending, squeegee and screen printing plate and glass is not a line contact, but surface contact, so that each squeegee can scrape the ink clean, leaving the residual ink, after a certain period of time will be the film caused by the paste plate. ⑤ The reason of improper gap between screen printing plate and glass. Screen printing plate and the gap between the glass can not be too small, the gap is too small after scraping the screen plate can not be detached from the glass in a timely manner, screen printing plate lifted, the bottom of the printing plate stuck on a certain amount of ink, which is also prone to cause paste plate. (6) the reason for the ink, in the screen printing ink in the pigment and other solid particles are larger, it is easy to block the mesh phenomenon. In addition, the selection of screen mesh and through-hole area and ink particles compared to the small, so that the coarser particles of ink is not easy to pass through the mesh and the phenomenon of screen sealing is also one of the reasons. The ink particles caused by the larger paste, can start from the manufacture of ink to solve the problem, the main method is to strictly control the fineness of the ink.
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