INDUSTRIAL JP

The process begins with a slitter—a cutting machine that slices a steel sheet into three parts: the body, lid, and bottom of the can. The material is set into the machine, dimensions are carefully checked, and the blade width is manually adjusted to match the required cut. It’s a precise task, with adjustments made in increments as small as 0.01mm.

Sent down the assembly line, the cut metal is pressed from below by a specialized tool, forming the body of the can. No glue is used—just precision folds that bond the metal together, seamlessly and securely.

In a square can production, there’s a process called “seaming” that tightly joins the body and the bottom. The bottom piece is placed onto the body, then a rotating pressure machine called a “seamer” presses around the edges—curling and locking the two parts together with precision.

Cylindrical cans go through a similar process to join the body and bottom. Since they have no corners, the can itself rotates while pressure is applied from a single point on the outside, completing the seam. Because of the high-speed rotation, precise setup is essential.

The lid is formed using a technique called “deep drawing,” which shapes a single flat sheet into a seamless three-dimensional form. Depending on the material and type of printing, the stretchability can vary. To ensure consistency during the drawing process, the automatic machines are carefully calibrated. At the factory, more than 20 press machines ranging from 25 to 80 tons of pressure line the floor.

Once the bottom and body are sealed together, the main body of the can is complete. A lid is then placed on top and the can is packaged, ready for shipment. In this manufacturing process, approximately 600 to 1,200 cans are produced per hour.