Application fields of glass screen printing techno

Brief introduction to the application field of glass wire printing technology

as one of the important fields in the silk screen industry, how does glass screen printing play an important role in the silk screen industry

introduction to glass wire printing technology

glass wire printing is to use silk screen printing plate and glass glaze to carry out decorative printing on glass products. Glass glaze, also known as glass ink and glass printing material, is a paste printing material mixed and stirred by coloring material and binder. The coloring material is composed of inorganic pigments and low melting point flux (lead glass powder); Binders are commonly known as board oil in the glass screen printing industry. After printing, the glass products should have clear division of labor and time schedule requirements. They should be fired in the furnace at a temperature of 520~600 ℃, and the glaze printed on the glass surface can be consolidated on the glass to form colorful decorative patterns. If silk screen printing is used in combination with other methods, Jinan Shijin currently has more than 20 product series and more than 300 product processing methods, it will get a better effect. For example, using polishing, engraving, corrosion and other methods to process the glass surface before or after printing can double the printing effect

the application field of glass fiber printing technology

the application and market prospect of printing flat glass printing flat glass is widely used in every corner of people's life: you can easily find their figures in display windows, building space zoning, building appearance beautification, car windshields and inlaid glass. At the same time They are also widely used in furniture decoration and game tools, as well as countless decorative and artistic creation. Plate printing has also become part of the creative design of glass manufacturing. People can print color images directly onto the surface of glass through plate printing. In addition, it can also be used to temporarily cover the non graphic part of the glass surface, or print preservatives and other additives in some areas of the glass surface, so that it is not affected by the etching or sanding process. In contrast, you can also directly print special inks to create an etching or sanding effect. Sometimes. People will also take advantage of the strong covering ability of printing, such as printing a thin layer of conductive material on the glass to make anti ice (Frost) devices for windows

plate printing continues to expand in the field of flat glass decoration. In addition to being suitable for all kinds of substrate materials, another important factor is that it can meet different sizes and weights of flat glass substrate in a large range. Moreover, due to the absolute advantage of plate printing in large format image printing, it has strengthened its leading position in the development of the whole flat glass printing industry. Especially in recent years, the demand for large format flat glass printing has increased sharply. In fact, due to the rapid development of plate printing in the field of large format flat glass decoration, printing equipment manufacturers are also constantly improving to meet the increasingly stringent printing requirements, especially in areas such as flat glass, resulting in many of the world's most flexible equipment being widely used in the printing of building panels. The application of plate printing in flat glass decoration will continue to develop and expand its application field in glass decoration. The plate printing machine has a faster substrate material transmission system, a more advanced power supply system, and a powerful PLC (logic controllable device)

in addition, the automotive industry has a strong demand for glass wire printing technology. In addition to the pure optical color application of wire printing, various functional layers (such as the heat conductor on the rear window) have also been modified. The conductor channel and the best structure (such as the rear window heating device) must be embossed in a timely and stable manner to ensure excellent quality

glass detection technology has attracted much attention

at this Shanghai glass exhibition, we noticed that another prominent feature is that the glass detection technology and equipment have received extensive attention, especially for some high-tech value-added glass printing products, such as LED, touch screen and the above automotive glass, solar substrate and so on. These products have strict requirements for quality and yield. Therefore, with the development of science and technology, more and more glass screen printing enterprises begin to pay strict attention to and control the quality of glass products, which makes glass inspection technology become another hot field in the current glass industry

as far as glass screen printing technology is concerned, what quality problems often occur in its processing

glass screen printing process is prone to problems

paste plate

1. Paste plate is also called blocking plate, which refers to the phenomenon that the ink cannot be transferred to the substrate in the through-hole part of the silk screen printing plate during printing. The appearance of this phenomenon will affect the printing quality, and even fail to print normally in serious cases. The reasons for the paste phenomenon in the process of silk printing are complex

the reasons for plate pasting can be analyzed from the following aspects:

① reasons for glass: the glass surface is not cleaned, and there are still dirt such as watermark, paper print, mimeograph, handprint, dust particles, etc. Thus causing paste

② reasons for workshop temperature, humidity and ink properties. The silk printing workshop requires to maintain a certain temperature of about 20 ℃ and relative humidity of about 50%. If the temperature is high and the relative humidity is low, the volatile solvent in the ink will evaporate quickly, and the viscosity of the ink on the silk will become high, thus blocking the hole. Another point that should be noted is that if the downtime is too long, there will also be a paste phenomenon. The longer the time, the more serious the paste. Secondly, if the ambient temperature is low, the ink fluidity is poor, and it is easy to produce paste

③ reasons for silk screen printing. The prepared screen printing plate can be used only after it is washed with water and dried before use. If the plate is placed to protect the environment for too long after making, it is not printed in time. In the process of preservation, dust will adhere to it more or less. If it is not cleaned during printing, it will cause paste

④ causes of printing pressure. During the printing process, too much embossing force will bend the scraper. The scraper is not in line contact with the screen printing plate and glass, but in face contact. In this way, each scraping can scrape the ink clean, leaving residual ink, which will cause a paste after a certain period of time

⑤ reasons for improper gap between screen printing plate and glass. The gap between the screen printing plate and the glass should not be too small. If the gap is too small, the screen printing plate cannot be separated from the glass in time after scraping. When the screen printing plate is lifted, a certain amount of ink is stuck on the bottom of the printing plate, which is also easy to cause board pasting

⑥ the reason of ink is that when the pigment and other solid particles in silk printing ink are large, it is easy to block the hole. In addition, the number of wire mesh and through-hole area selected are smaller than the particle size of the ink, which makes it difficult for the ink with coarser particles to pass through the hole and seal. The paste caused by the larger particles of ink can be solved from the time of manufacturing ink. The main method is to strictly control the fineness of ink

in the printing process, the increase of ink viscosity causes plate pasting. The main reason is that the ink solvent on the screen printing plate evaporates, resulting in the increase of ink viscosity and sealing. If the printing area is relatively large, the ink consumption on the screen printing plate is more, and the paste phenomenon is less. If the image and text area is small and the ink consumption on the screen printing plate is small, it is easy to cause paste. The countermeasure is to adopt the principle of adding ink a few times. The poor fluidity of the ink will make the ink paste when it does not pass through the silk. This situation can be solved by reducing the viscosity of the ink and improving the fluidity of the ink without affecting the printing, which is expected to reach 4.439 million tons by 2016. In case of a paste failure, appropriate solvent can be used for scrubbing according to the nature of the ink on the plate. The key of scrubbing is to start from the printing surface and wipe gently from the middle to the periphery. Check the printing plate after wiping. If there is any defect, it should be repaired in time. After repairing, the printing can be restarted. It should be noted that the plate film becomes thinner every time it is wiped. If there is a major defect in the plate film during wiping, it has to be printed with a new version

2. The ink is not firmly fixed on the glass

① when printing the glass, it is very important to strictly degrease and pre-treatment the glass before printing. When the glass surface is attached with grease, adhesives, dust and other substances, it will cause poor adhesion between ink and glass

② insufficient adhesion of the ink itself causes the ink film to be unstable. It is best to replace other types of ink for printing. Improper selection of dilution solvent will also lead to the phenomenon of weak adhesion of ink film. When selecting dilution solvent, the nature of ink should be considered to avoid the phenomenon of weak adhesion between ink and substrate

3. Uneven inking and uneven ink film thickness are caused by various reasons. In terms of ink, it is the poor allocation of ink, or the normally allocated ink is mixed with the ink skin. During printing, due to the effect of solvent, it expands and softens, blocking the holes that should be through the ink, playing the role of plate film, so that the ink cannot pass through. In order to prevent this kind of failure, the blended ink (especially the old ink) should be filtered before use. When reusing the used printing plate, the old ink attached to the plate frame must be completely removed. When storing the printing plate after printing, it should be fully washed (including scraper). If the tip of the front end of the ink return plate is damaged, marks will appear along the moving direction of the scraper. When printing glass, there will be obvious uneven inking

therefore, the front end of the scraper must be well protected from damage. If it is damaged, it must be carefully ground with a grinder. Moreover, the unevenness of the printing table will also affect the uniformity of inking. The ink layer in the convex part is thin, and the ink layer in the concave part is thick. This phenomenon is also known as uneven inking. In addition, if there is dust on the back of the substrate or on the printing table, the above fault will also occur

pinhole phenomenon

pinhole phenomenon is the most headache for staff engaged in glass fiber printing. There are many reasons for pinholes, many of which are unexplained at present, and some are quality management problems. Pinhole is one of the most important inspection items in the inspection of printing products

① dust and foreign matters attached to the plate. During plate making, some sol will be mixed in during water washing and development. In addition, when the emulsion is coated, dust is also mixed, and pinholes will be generated when it is attached to the silk. These can be found and repaired in time if you pay attention to inspection during the test. If dust and foreign matters adhere to the plate, blocking the opening of the plate will also cause pinholes. Before the official printing, the edition should be carefully checked to remove the dirt on the edition

② cleaning of glass surface. The glass plate shall be printed immediately after its surface is cleaned by pretreatment before printing. If the glass is not printed immediately after treatment, it will be polluted again. After pretreatment, dirt such as grease can be removed, and dust attached to the surface can also be removed. Special attention should be paid to that when moving the glass by hand, the fingerprint of the hand will also adhere to the printing surface, and pinholes will be formed during printing

bubbles appear

bubbles sometimes appear on the ink after printing. The main reasons for bubbles are as follows:

① poor prepress treatment of substrate. Dust, oil stains and other substances are attached to the surface of the substrate

② bubbles in ink. In order to adjust the ink, some bubbles will be mixed in the ink when adding solvents and additives for stirring. If