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Manual PP&PET strapping tool

Process production of baked blue packing steel belt

by:Hongmei     2021-03-15
The key point of the bake blue packing steel strip is the word 'bake blue'. Generally, bake blue is called oxidation or bluing. It is the process of immersing the packing steel strip in an oxidizing solution to form a blue-black oxide film on the surface.
  The main process of oxidation of the blue-clad steel strip is: firstly remove the grease, oil film and impurities on the surface of the steel strip, remove rust spots in 100~180g/L H2SO4 solution, and then rinse with clean water. Oxidation. The oxidation of the baling steel strip is usually carried out in a solution of 550-700g/L NaOH and 100-250g/L NaNO2, the solution temperature is 140-145℃, and the oxidation is 60-120min. Rinse it with clean water after oxidation, and then soak it in 30-50g/L soap, a saponification solution with a pH of 7-8.5 and a temperature of 80-90°C for 5-10 minutes to improve the corrosion resistance of the oxide film in a humid medium.
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