The term glass frosted refers to a method of using chemical methods to obtain the effect of glass frit. Chemical Frosted is essentially the matte etching method, glass frosted glass etching is also a type. The difference between it and etching is that the sand is a shallow layer of etching, the surface was mist; and the etching of the deeper etching, the etching of the picture was transparent. The matte etching is limited to the part of the glass product, while the matte is the dull matte surface formed by the erosion of the entire glass product surface. The resulting sparingly soluble reactants become small-grained crystals firmly attached to the surface of the glass. The degree of contact between the lower surface of the particles and the glass surface of the particle gap and the acid solution is different and the degree of erosion is also different, leaving the surface uneven. By controlling the size and number of crystals attached to the glass surface, rough matte or delicate matte surfaces can be obtained. Frosted glass products because of its uniform and delicate surface, feel smooth, beautiful and beautiful appearance, light transmission and other characteristics of the widespread consumer favorite. In recent years, some alcoholic drinks, cosmetics bottle packaging is also a large number of Frosted bottle dress. The pursuit of diversification in the home decoration, luxury flat glass frosted decorative glass applications are more and more common, the more extensive. Chemical Frosting use Frosting fluid (powder) or Frosting plaster as materials, using immersion method, screen printing method, spraying method and flat placement technique.
Frosted glass screen printing production
1. The manuscript
The manuscript (film, original) is the basis of screen printing, printing plate is the first part. Select the appropriate manuscript, monochrome original (text, lines) to have enough contrast, the draft of the high resolution. The general graphic can be hand-painted on sulfuric acid paper, graphic part of the blackness is high, not transparent. For fine text, geometric patterns and other manuscripts can be applied to computerized photo, and then use the laser photo shoot according to Frosting chart Yin, Yang version made of silk screen printing.
2. Plate selection of materials
Screen is the production of the screen of the skeleton is to support the photosensitive film matrix, determine the quality of the plate is good or bad. Therefore, the choice of good screen and screen frame material is very important, on the glass frosted print adaptability and graphic detail, usually use 160 mesh ~ 250 mesh polyester mesh, mesh selection should take into account the mesh size and Frosting paste in the diameter of the match, such as the mesh is too large (ie, the mesh is too small), the particles in the print material is difficult to get through the screen, will result in printing Frosting paste version, affecting the normal screen printing ; If the mesh is too small (ie, the mesh is too large), print out the accumulation of printed material on the graphic too much, printed graphic edge is not fine, difficult to clear the graphic, not only waste of printed materials and increase costs. The shape and size of the cross section of the screen frame is one of the important factors to be considered in the selection. The size of the cross section of the screen frame may be determined according to the size of the screen frame. The cross section of the screen frame can resist the tension of the screen and be stable. Such as the screen width (1.7 ~ 2.2) m, the frame should be made of aluminum or hard-to-deform wood material.
Stretch before the first screen size in accordance with the selection of the corresponding screen frame, screen mesh and screen bonding side of the clean, in order to improve the screen and screen frame adhesion fastness. The size of the screen frame is generally 1.5m × 2.0m. The two long sides of the screen frame can be slightly curved to the inside (the center of the screen frame) according to the tension condition. The purpose of the screen frame is to make the screen frame resist the tension of the screen to keep it stable Sex. Stretching the network is best to use Stretching Stretching, and tension gauges used to measure the tension of the screen, because the screen required to be uniform when frosted, so that the printing quality is guaranteed, to grasp a certain degree of tension and tension, the screen has a good The uniform tension and excellent operating performance. For large-format glass-screen printing Frosting, monochrome plates should be printed according to the screen at right angles to the net, every effort to ensure the warp and weft yarns perpendicular to each other. If multi-color overprinting, Stretching angle should be 22.5 ° is appropriate, so inclined stretch net will waste some screen, but to ensure the quality of printing. After the network is stretched, it should generally be placed 1 to 2 days and then scraped and dried. In this way, the tension can be maintained uniformly and for a long time.
Stretching the net after the light on the plastic before, in order to enhance the adhesion with the screen, but also on the empty version of the positive and negative sides were cleaned with detergent or soda ash composition of the degreasing cleaner rubbing, the screen surface Degreasing and coarsening treatment, and then rinse with water or high pressure water gun rinse, if the screen is also stained with water droplets, compressed air gun can be used to remove, and use a clean, soft cloth to dry and put aside.
Plate-making, to be clean and dry in the empty network coated with light-sensitive adhesive in the squeegee gluing process should be in a dark room environment with safe lighting (red or yellow light conditions), the general first in the front and back of the screen With a plastic device (scraping bucket) coating a layer of photosensitive plastic, the general use of solvent-resistant photosensitive plastic. Large-format screen with manual scraping gum more difficult, you can use SHCM type photosensitive glue coating machine or MS type photosensitive glue coating machine. Squeegee manually in the yellow light, select the scraper size should be slightly smaller net frame, the net frame can be run smoothly. During the specific operation, the screen frame may be slightly tilted, so that the squeegee tilts toward the mesh surface. The screen is moved smoothly and slowly from bottom to top so that the photoresist contacts the mesh surface. Scrape the excess light sensitive plastic, the thickness of the screen film according to the printing needs to determine the number of plastic scraping, the more the number of thick film on the plate. After gluing, the printing surface of the printing plate will be placed horizontally facing upwards for natural drying or heating and drying. After the thickness is insufficient, it can be further scraped (positive and negative) several times. Scratch the thickness to be uniform, do not run too fast, to reduce the bubble. Thicker film can increase the clarity of the picture, but will extend the drying time, increase the amount of printed material, but also must extend the exposure curing time. The printing process should pay attention to the manuscript, copy machine glass countertops may not have dust and dirt, if the drying out of the page appear blisters and the wrong version of the phenomenon. The preservation of large plates in the constant temperature and humidity conditions more difficult to do, generally take the glue in the backlight after the full drying timely plate, will not occur dark reaction. In the process of printing, the screen, the bottom plate and the plate-making machine table should be three compaction (if someone with sand bag compaction), there should be no gap or move, or sunburn plate will appear shadow, resulting in Graphic deformation. It is best to use a vacuum shaver, evacuated before the exposure, the three are both compacted and difficult to slip. Exposure light exposure distance of the diagonal of the screen frame, the exposure of the screen in the water flow after the development, and then use the spray gun spray out a certain pressure of the water flow to the graphic part of the photosensitive rubber (unexposed part) washed through, Until the rinse clean foam and no openings in the graphic office so far. But also do not flush too long, water pressure over the General Assembly undermine the graphic outline. After washing with absorbent paper or hygroscopic cloth to absorb the water on the screen. Check the integrity of the plate, if the printing plate drying well, you can spray boric hardener, so that the screen hardening, and then place the level of natural drying, if the print is too high, can be placed on the drying plate (machine) again Second exposure, to enhance the screen printing capacity. Finally, with a photo-sensitive adhesive or seal plastic version and the tape or the closure of the mesh screen mesh with the transfer of the edge seal, to prevent the loss of print printing and cleaning difficulties.
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