Screen Printing Of Metal Packaging Products In The Main To Be Carried Out Before Treatment - Metal

Many different types of metal packaging products

, with different physical properties, uses different surface requirement is different, so in the screen printing of metal packaging products for different pre-press before processing.

Prepress processing methods include degreasing, polishing, mechanical oxidation, paint, surface coatings. The main role of pre-press processing of metal packaging products, processed to remove defects and improve surface appearance results, while changing the surface finish of metal products to enhance printability.

Degreasing of metal packaging products in the screen printing of a pre-treatment process. The main purpose is to clear the metal surface of the oil, gray trace. The basic method of oil removal, according to oil type, choose the appropriate Solvent Or cleaning fluid on the surface of metal packaging products, cleaning. Commonly used solvents are organic solvents or alkaline solution. Cleaning fluid primarily by sodium phosphate, sodium carbonate soap etc..

Polishing is screen printing of metal packaging products in a pre-treatment process. The main purpose is to eliminate metal surface rough, uneven, scratches, bumps and other defects and improve the metal surface brightness.

Polishing is commonly used in pre-press treatment. Polishing can be divided into mechanical polishing, chemical polishing and electrolytic polishing.

body polish. Mechanical polishing cloth wheel is polished by machine or Polygonum posumbu uncle ray machines for metal surface treatment, the surface has a mirror effect. After polishing, but also to wash with soap and water, and air-dried to oxidation and printing purposes. Mechanical polishing are used for the production of aluminum plate.

chemical polishing. Chemical polishing is the use of polishing equipment, metal products immersed in phosphoric acid, sulfuric acid, nitric acid solution in the chemical composition of polishing, the metal surface to achieve beautiful, bright and smooth the effect of

electropolishing. Electropolishing is the electrolytic solution used in the polishing device for polishing. Fluid power solution primarily by phosphoric acid, sulfuric acid, water composition. Current density of 12 ~ 30A/dm2, the temperature between 70 ~ 90 , voltage 10 ~ 18V. Electropolishing is the use of the metal surface density greater than the recesses protruding point of the computer easily electrolysis current density and the principle of electrolysis to points raised faster speed than the recess so as to achieve the purpose of polishing. Electrolytic polishing is to obtain high brightness mirror finishing method.

Prepress oxidation process is the production of aluminum surface treatment method commonly used signs.

Oxidation refers to a certain concentration of acid solution, through the adjustment of current density on the metal as the anode for oxidation process method. The oxidation of metal materials can generate hard texture and chemical properties of a stable oxide. Generated oxide layer is characterized by: a dense oxide layer with pores, increased ink adhesion; oxide layer has good insulation, suitable for making various signs electrically charged occasions; oxide layer can increase the hardness of metal materials and increased wear resistance. General use sulfuric acid oxidation, chromic acid and oxalic acid solution. Using oxalic acid more available for oxidation caused by the oxide layer encryption.Xiaobian Recommended:by: gaga

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