1.The traditional manufacturing method of metal can is as follows: firstly, the sheet metal blank is cut into a long square, then the blank is rolled into a cylinder (i.e., the cylinder body), and then the longitudinal joint line is soldered together to form a side seal. One end of the cylinder (i.e., the bottom of the metal can) and the round end cap are mechanically formed with flange and rolled (i.e. double crimping seam), so as to form the can body of the metal can; This kind of metal can is called three piece can because it is composed of three parts: the bottom, the body and the cover. In the past 150 years, the method has not changed much, but the degree of automation and processing accuracy have been greatly improved. In recent years, the welding seam of side seal has been changed to fusion welding.
2.In the early 1970s, a new can making principle appeared. According to this principle, the body and bottom of the can are a whole, which is formed by stamping a round plate blank, and sealed after being loaded into the product, There are two forming methods for this kind of metal can: stamping thinning drawing method and stamping re stamping method. These technologies are not new in themselves. The punching drawing method has been used to make shell shells as early as World War I. The difference between them is that ultra-thin metal is used and the production speed is high (the annual output can reach hundreds of millions).
Post time: Oct-29-2020