Coated glass for architectural glass are generally coated film. We called the film thickness which is less than 1um film, the film thickness is higher than 1um thick film coating process is called with different materials on the substrate surface to form a new surface method. Many coating methods, vacuum evaporation, vacuum sputtering, chemical reduction, sol-gel method. It requires to have a very strong film adhesion, adhesion is not strong is called coverage. To obtain strong adhesion, it is necessary to clean the glass surface.
During coating the substrate before they must be cleaned, the coating line, this is a very small thing, but for off-line coating is quite important, but also more difficult to operate, for a large area of coating, the glass substrate will be completely clean is impossible, therefore, necessary to achieve the required coating cleanliness becomes very important. Level high enough to keep clean, if cleanliness is not enough, the film is easy to aging, Zinc oxide even stripping and so on. Different purposes, different processing of the film on the cleanliness of the requirements is not the same, for the current production of glass, Low-E glass glass required cleanliness as a high heat-reflective glass. Now ready for coating large areas of coated glass substrates, primarily used in a wet cleaning technology, which consists of three parts: the loose glass surface impurities; removal has been loose, and the separation of impurities; drying has been clean glass surface.
For the loose impurities, we put this call pre-cleaning, brushing methods are generally used, scrub with a brush mechanical principle is the separation of the glass surface of the dust, re-use the nozzle to spray water or other liquid to clean the glass up to In addition to large particles of dust. In the pre-cleaning process, the basic use relatively coarse hair brush for cleaning the disc, a number of small-cap brush attached to a bearing on the composition of a group, a washing machine has multiple sets. During cleaning, the plate itself is rotating brush, brush the elastic loose use of the glass surface impurities, Magnesia while the left-right move to connect the bearing to ensure that every part of the glass clean. In this section, the general use of tap water. If the glass substrate kept too long, or long on the damp environment, the glass is easy to mold, mildew mold glass is difficult to scrub clean out by the general, tend to be polished. Polishing brush using the disk to thick brush, often adding cerium oxide polishing or citric acid in the tank. Cerium oxide is a sticky substance that can increase the disk friction between the brush and the glass, citric acid decomposition of organic matter may be appropriate. Cerium oxide is easily contaminated with washing machine rollers, washing machine is not easy to clean and maintain, under normal circumstances do not use. Brush each disk in between multiple nozzles are installed to a certain point of a certain pressure on the glass surface to spray water, cleaning of large loose particles of impurities, the use of the water, tiny impurities can not be removed.
Separation of small particles to remove impurities in some parts we call it cleaning, washing and cleaning in the pre-tend to have a spacing between the parts, in this, only water, no brush, nozzle direction is towards the pre-wash part of the The purpose is to pre-clean or dirty the large particles into the clean part of the material is not conducive to cleaning machine maintenance. In the cleaning section, most of the use of roller brushes, Nickel oxide also uses a set or two sets of disk brush, roller brush can only clean the impurities have been loose and the glass surface or a combination of solid impurities is not in use this brush to further loosen with a solid plate impurities, and then use the roller brush clean. By the same token, there are nozzles spray cleaning section, washing section is to use a different water, pure water is sprayed from the nozzle to the last row of the glass surface, and then returned to the tank, then the low recovery of pure water from the penultimate row jet to the glass surface, and so on.
For actual mass production of coated glass production line is generally used air knife drying the glass substrate surface. It uses compressed air blown through the slit nozzle wet glass surface, the wind blowing out from the slit as the blade, as the glass substrate can be immediately separated from the surface of the water film and its atomization, and finally discharged together with air to go. Compressed air must be very clean, which means it must go through a special filter to filter. Air Knife Drying has many advantages; that can quickly remove the water film can keep the glass substrate has been in a low temperature. This reduces the effects of precipitation, and cleaned the glass material to form the point of precipitation will fall to the lowest or stripes. Wind angle and wind blade knives are generally the size of fixed and can not easily change, so when maintenance can not be easily demolished and the house is always dirty air knife, resulting in contamination of the glass in the dry, clean air knife when maintenance it is very important, and has a certain degree of difficulty. Source: