This passage will introduce the screen printing process of glass. According to the principle of screen printing, the ink is printed on the surface of the glass, and then the curing method of the ink is used, and the printed pattern is firm and durable. The process flow of glass screen printing is as follows:
Stretching net→sizing→drying→printing→developing→drying→Flat glass → cutting → edging → cleaning and drying → printing→Sintering
1. Suitable printing glass
Cut the glass according to the user's requirements, it can be regular shape, or it can be irregular shape, then it can be edged and ground, then cleaned and dried for use. Special care should be taken here that there should be no water marks on the glass surface.
2. Screen selection
The screen printing plate for glass printing is the same as the general screen printing plate, and the glass screen printing plate is made of synthetic fiber mesh, stainless steel wire mesh and natural fiber mesh. The specifications of the wire mesh are generally 270 to 300 mesh.
3. Frame selection
At present, the frame that is relatively regular and has little deformation is an aluminum alloy frame, and its size should be larger than the pattern. The specific size should be that the outer edge of the pattern should be between 70 and 100 mm from the frame.
4. The mesh and the mesh frame are selected in the stretch net, and the two are combined. This is the stretch net. At present, the more advanced, high-quality screen version is a pneumatic stretcher. The requirement of the stretch net is that the tension is uniform, the web warp and weft are kept vertical, and the adhesive mesh is firm and cannot be slack.
5. Select photosensitive adhesive
Currently, commercially available photosensitive adhesives are dichromate, diazonium, and iron salts. Silk screen printing requires the photosensitive adhesive: good plate making performance and easy coating. The sensitizing spectrum ranges from 340 to 440 nm, with good developing performance, high resolution, good stability, easy storage, economical, non-toxic and pollution-free.
6. Printing version
The printing plate is required to be exposed on a cold light source printing machine, and the exposure time is determined according to the pattern, generally between 12 and 30 minutes. Screen printing screens are produced after exposure and development.
7. print
There are several types of flat glass printers: manual, semi-automatic and fully automatic.
8. Ink
Inorganic glass screen printing uses two kinds of inks, one of which is that the inorganic pigments are ground to a certain degree of fineness.
9. sintering
The glass glaze is decorated on the surface of the glass by silk screen printing, and needs to be fixed to the glass surface by high temperature sintering, but the sintering temperature must be lower than the softening temperature of the decorative glass to ensure that the decorative glass is not deformed. Generally, the glass glaze has a sintering temperature of not higher than 520℃, and is usually controlled at 480 to 520℃.
Hope this passage will be helpful for you when printing glass.
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