Firstly, the substrates tin plate sheet printed are various metal sheets. At present, tin plate sheet printed substrates are usually tin plated steel sheet (also known as tinplate), chrome-plated sheet steel, ordinary sheet steel, and aluminum alloy sheet.
According to the different hardness of these metal sheets, the adjustment of the roller pressure is the key to operation. In addition to printing, it can be divided into three types: hard iron, neutral iron, and soft iron. Aluminum alloy sheet is soft, ordinary sheet steel is neutral, and chrome-plated sheet steel is rigid. In the printing process, it is necessary to adjust the cylinder pressure and select the appropriate lining material depending on the hardness of the substrate.
Secondly, Coatings play a decisive role in the quality of printing on tin plates. The coating can increase the adhesion between the tin plated steel sheet and the ink layer and protect the ink film layer.
Thirdly, use special printing ink. As the surface of printing on tin plates substrates is smooth and does not have the ability to absorb, printing on tin plates inks rely on oxidized conjunctiva and volatilization to dry.
At the same time, tin plate sheet printed is ofen used in cans after printing, which requires that the tin plate sheet printed inks are resistant to high temperatures and cooking, and non-toxic.
Fourth, the operation of printing on tin plates is different from general offset printing. When manufacturing the printing machine, the blowing force of the blowing nozzle and the suction force of the mouthpiece should be considered, and a horseshoe magnet should be added at the feed to overcome the adsorption force between the tin plated steel sheet .
