Screen Printing and Packaging

Screen Printing and Packaging
Metal packaging products, many different types, different physical properties, uses a different surface, different requirements will, therefore, metal packaging products in screen printing to be different before the pre-press processing.
Pre-treatment methods are mainly degreasing, polishing, mechanical oxidation treatment, spray painting, surface coating, etc.. Pre-press deal with the main role is to remove the metal packaging products processing defects and improve the aesthetic effect of the surface and at the same time to change the metal surface finish and improve Printability.
Degreasing of metal packaging products in the screen printing of a pre-treatment process. The main purpose is to remove the surface of metal products oil, gray trace. Apart from the basic approach is, according to oil type, choose the appropriate solvent or cleaning fluid, metal packaging products for surface cleaning. Commonly used solvents are organic solvents or alkaline solution. Cleaning fluid mainly by the sodium phosphate, sodium carbonate, such as the composition of liquid soap.
Polishing is also a metal packaging products in front of a screen printing process. The main purpose is to remove metal surface rough, uneven, scratches, bumps and other defects, to improve metal surface brightness.
Pre-polishing is commonly used methods of treatment. Polishing can be divided into mechanical polishing, chemical polishing and electropolishing.
Pre-oxidation process is the production of aluminum plate surface treatment methods commonly used.
Oxidation is defined as a certain concentration of the acid solution, current density through the adjustment of the metal as the anode oxidation treatment process. By the oxidation treatment of metal materials can generate a hard texture, chemical properties of a stable oxide layer. Generated oxide layer is characterized by: dense oxide layer with pores, an increase of the adhesion of the ink; oxide layer with better insulation, suitable for the production of a variety of sign occasions charged; oxide layer can improve the surface hardness of metallic materials , an increase of wear resistance. Oxidation treatment in general the use of sulfuric acid solution, chromic acid solution and oxalic acid solution. The use of oxalic acid oxidation solution available to handle more of the oxide layer caused by encryption.
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