Tinplate can production process

Manufacturing process of tinplate cans: production process of roll-jointed cans

As a widely used packaging material, the exquisiteness of the manufacturing process of tinplate cans directly affects the quality and market competitiveness of the products. Among the many types of tinplate cans, three-piece cans stand out with their unique structure and manufacturing process. This article will introduce the roll-jointed can manufacturing process in three-piece cans in detail, taking round cans as an example.

1. Cutting

The first step in the manufacturing process is cutting. Use a shearing machine to cut the tinplate into a blank of the can body plate or can cover and bottom according to the size required by the design drawing. This step is the basis of the entire production process and ensures the smooth progress of subsequent processes.

2. Cutting corners and cutting notches

Cut off the upper and lower corners at one end of the rectangular blank, and cut out the upper and lower notches at the corresponding positions of the other end. The purpose of this design is to make the upper and lower ends of the can body seam overlap with two layers of sheet material, which is convenient for the subsequent flanging and can sealing processes. The corner cut can be cut into a right angle, pagoda shape, or obtuse angle, while the notch can be cut into a V shape or a U shape.

3. Curling

The curling process requires the cooperation of a curling machine to roll the mouth of the can body inward into a small arc. The purpose of this step is to prevent the sharp edge of the mouth of the can body from hurting people and ensure the safety of the product.

4. End folding

The end folding process is to allow the can body to hook together when it is rounded. Use an end folding machine to fold the two ends in the opposite direction and the front side respectively, so as to facilitate the subsequent rounding process.

5. Rounding

The rounding process is carried out on a three-roller machine, and the upper roller rotates in the opposite direction to the lower two rollers. When the iron sheet passes through the middle, it is rolled into a cylindrical shape under the action of pressure and friction. This step is the key to the can body forming.

6. Flattening

After the end folds on both sides of the can body are hooked together, they are flattened by a flattening machine to form a firm sharp edge seam. This step ensures the structural stability and sealing of the can body.

7. Flanging

The flanging process includes spinning flanging, bending flanging, impact flanging and other methods, all of which are aimed at sealing the can and ensuring the quality of the roll seal. This step is crucial to the sealing performance of the can.

8. Bottom sealing

The bottom sealing process is carried out on the can sealing machine, so that the can body and the bottom of the can are sealed through double roll sealing. This step completes the overall structure of the can and ensures the integrity and sealing of the product.

9. Rib rolling

Finally, ribs are rolled out on the can body to enhance the structural strength and aesthetics of the can. This step not only improves the practicality of the product, but also increases the market appeal of the product.

In summary, the roll-to-can manufacturing process of tinplate cans is a complex and delicate process, and every step is crucial. This process not only ensures the high quality and safety of the product, but also makes tinplate cans more competitive in the market. With the continuous advancement of technology and the increasing diversification of consumer needs, the manufacturing process of tinplate cans will continue to develop and improve.