Printing new process decal operation process
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The decals are divided into two categories: trademark decals and porcelain decals. The trademark decals are printed by ordinary ink or tinplate ink, which is used to attach to the surface of wood or metal products. Porcelain decal paper is printed with ink prepared with special pigments, attached to glass, porcelain, enamelware, and then kiln, according to the requirements of different materials, after 400 ~ 500 ° C, or even 800 ° C temperature of calcination, the need colour.
First, the decal printing process
The process of decal printing is: crepe paper → plate making → printing.
The crepe paper is the first process of the decal printing operation process. If this process is not completed, the paper will not be easily uncovered, or the shelling, the pattern sticking to the paper, and the whole can not be transferred to the vessel.
The method of picking paper is divided into two types: paper cutting and mechanical creping. After creping, the paper is coated.
Plate making and plate making methods use photoengraving.
Printing, generally using lithography. The graphic requirements printed on the decal paper are reverse images, so that the image is erected on the object. At the same time, according to the use and the method of use, when printing color graphics, the order of color matching is opposite to the general printing method, that is, the ink with high transparency is printed first, and the opaque ink with large hiding power is printed. After being applied, the graphic is consistent with the general printed image, and the transparent ink layer is on the surface. In order to transfer the graphic to other special surfaces, the color of the image itself is not affected by the color of the object itself, and the first and second extremely opaque white inks are printed on the final layer of the decal level.
Printed ceramic decals, usually dark first, light after printing. The key to the ink used is the pigment, most of which uses metal oxides and a few sulfides and selenides. For example, yellow is oxygen lead, strontium oxide and cadmium sulfide, blue is cobalt blue, white is titanium dioxide, bright red is made of aluminum oxide, rose and purple are tin oxide, green is nickel oxide, and gray ink is nickel oxide. , brown black with copper oxide, etc., these are high hardness inorganic pigments, therefore, their particle fineness has become a key in the application process. The main components of the mediator are aluminum, quartz, borax, etc.; the proportion varies with the color of the metal oxide, and the effect is to use the metal oxide to melt uniformly, produce gloss, and lower the melting point; when the ceramic pigment is printed, the same color can be overprinted. Different colors cannot be overprinted and can only be overprinted. Otherwise, it will cause chemical changes at high temperatures, causing discoloration and bursting. Therefore, the spot color is generally used, and the principle of the three primary colors is not applicable to the printing of ceramic decals.
Second, the transfer method
The trademark decal paper transfer is to apply a layer of varnished water to the surface of the object to be transferred, such as wood, metal products, etc., and then dry it, then apply the applique with water or boric acid paste on it and apply it. Under a certain pressure, then you must remove the paper.
For the transfer of ceramic decal paper, first coat the surface of the porcelain with a layer of gelatin solution, then attach the decal paper to the porcelain, massage it by hand, so that the printing is in close contact with the surface of the porcelain, and then apply the sponge to the decal On the back side, the surface of the paper and the porcelain are tightly attached. After the gelatin is dried, the porcelain is immersed in water to dissolve the glue on the paper. The graphic containing the metal oxide leaves the paper, and is attached to the porcelain to remove the paper. The brush is washed with water to remove the residual gelatin on the surface of the porcelain. After drying, it can be calcined in the kiln.
At present, decal printing is widely used, and the trademarks of machine tools, instruments, bicycles, trademarks on furniture, and patterns on porcelain are all made by decal printing methods.
Decal printing is a printing method in which a transferable graphic is printed on a paper or plastic film coated with a film to become a decal or decal film and then transferred onto the surface of various materials.
The decals are divided into two categories: trademark decals and porcelain decals. The trademark decals are printed by ordinary ink or tinplate ink, which is used to attach to the surface of wood or metal products. Porcelain decal paper is printed with ink prepared with special pigments, attached to glass, porcelain, enamelware, and then kiln, according to the requirements of different materials, after 400 ~ 500 ° C, or even 800 ° C temperature of calcination, the need colour.