There are two types of decals: trademark decals and porcelain decals. The trademark decals are printed by ordinary ink or tinplate gold ink, which is used to paste on the surface of wood or metal products. Porcelain decals are printed with ink prepared with special pigments, and pasted on glass, porcelain, and enamelware, and then kiln, according to the requirements of different materials, after 400 ~ 500 ℃, or even 800 ℃ calcination, there is a need colour.
1. Decal printing process
The decal printing process flow is: mounting paper → plate making → printing.
Mounting paper is the first process of the decal printing operation. If this process is not done well, it will cause the paper to be difficult to uncover, or the shell will stick to the paper and the pattern will not be transferred to the utensils.
There are two methods of laminating paper: laminating paper and mechanical laminating paper. After laminating the paper, the paper is coated.
Plate making, the plate making method adopts photo plate making.
Printing, generally lithographic printing. The image and text printed on the decals are required to be reverse images, so that the image and text become positive images when they are attached to the utensils. At the same time, according to the different uses and methods of use, when printing color graphics, the color stacking sequence is opposite to the general printing method, that is, printing high transparency ink first, and then printing opaque ink with greater hiding power. After pasting, the graphics and text are consistent with the general printed graphics and text, and the transparent ink layer is on the surface. In order to transfer the image and text to the surface of other special bodies, the color level of the image and text will not be affected by the color of the object itself, and one or two extremely opaque white inks are printed on the last layer of ink on the decal level as the bottom layer.
Printing ceramic decals, usually printed in dark color first, then printed in light color. The key to the ink used is pigments, most of which use metal oxides and a few sulfides and selenides. Such as yellow lead oxygen, antimony oxide and cadmium sulfide, blue with cobalt blue, white with titanium dioxide, bright red with aluminum oxide, rose and purple with tin oxide, green with nickel monoxide, gray ink with nickel trioxide , Copper monoxide used for brown and black, these are high hardness inorganic pigments, therefore, their particle size has become a key in the application process. The main components of the medium melting agent are aluminum dan, quartz, borax, etc .; the ratio changes with the color of the metal oxide, the function is to use the metal oxide to melt uniformly, produce gloss and reduce the melting point; when printing ceramic pigments, similar colors can be overprinted Different colors cannot be overprinted, only overprinted. Otherwise, it will cause chemical changes under high temperature, causing discoloration and popping. Therefore, spot colors are generally used, and the principle of mixing three primary colors is not suitable for printing on ceramic decals.
Second, the transfer method
The trademark decal transfer is to apply a layer of vanilla water to the surface of the transferred objects such as woodware and metal products. After a little drying, apply the decal moistened with water or boric acid to the surface and apply it. Certain pressure, and then Xiaobei can peel off the paper.
For the transfer of ceramic decals, first apply a layer of gelatin solution to the surface of the porcelain, then paste the decal on the porcelain, massage it by hand to make the printing closely contact with the surface of the porcelain, then apply sponge to the decal On the back, make the surface of the paper and the porcelain close to each other. After the gelatin dries, immerse the porcelain in water to dissolve the glue on the paper. The graphics containing metal oxides leave the paper and attach to the porcelain. Remove the paper and use The brush is dipped in water to wash off the residual gum on the surface of the porcelain. After drying, it can be calcined in the kiln.
At present, decal printing is widely used. The trademarks of machine tools, instruments, bicycles, furniture, and porcelain patterns are all made by decal printing.
Decal printing is a printing method that prints transferable graphics on paper or plastic film coated with adhesive film, becomes decal paper or decal film, and then transfers on the surface of various materials.
There are two types of decals: trademark decals and porcelain decals. The trademark decals are printed by ordinary ink or tinplate gold ink, which is used to paste on the surface of wood or metal products. Porcelain decals are printed with ink prepared with special pigments, and pasted on glass, porcelain, and enamelware, and then kiln, according to the requirements of different materials, after 400 ~ 500 ℃, or even 800 ℃ calcination, there is a need colour.
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