Tin cans are traditional three-piece cans Tin solder ca […]
Tin cans are traditional three-piece cans
Tin solder can is a traditional three-piece can, which is to cut the tin plate (paint iron or plain iron) according to the size of the can body, cut, round, round, hook, flat, solder, flange After the can body is formed, and then sealed with the bottom of the can. This can making method currently has a top speed of about 40 cans per minute. The electric resistance welding can is a major innovation in the production of three-piece cans. It uses a large current (~5000A) with a frequency of 50-300 Hz on the welding machine, and produces about 1000 °C through the welding wheel and the auxiliary copper wire at the overlapping portion of the can body. The high temperature, and re-crystallization by extrusion to complete the welding, so the welding strength can exceed the strength of the thin plate itself, and the weld width is only 0.3 ~ 0.6mm, commercially known as super-dimensional welding. Compared with soldering cans, the advantages of electric resistance welding cans are high production speed (100-600 cans/min), saving plates, eliminating the infiltration of toxic lead into the food in solder, and being suitable for chrome-plated sheets. The punching and drawing cans (DI cans) are the mainstream of today's two-piece cans. The can bodies are manufactured by roll-shaped tin-plated sheets or aluminum sheets through the production processes such as cupping, deep drawing, pot-shaped color printing, and can coating. In the high-speed stamping process, the tank wall is stretched, the wall thickness is only 0.12mm, and the current tank making speed can reach 1200 cans/min.