Chapter V Structural Design and Fabrication of Three-piece Metal Cans
One and three piece tank structure
The three-piece can consists of a can body, a can bottom and a can lid. The upper edge and the lower edge of the can body are respectively the joint parts of the can lid and the can body and the can body and the can bottom. To make the body edge of the can seal with the can cover of certain specifications, the can body can be designed as a shrinkage structure.
1, can body
1 can body seams. The can seam is a welded (adhesive) seam at both ends of the can body after the can body is formed.
2 ring ribs. When the can body diameter and height are large, the ring ribs may be rolled in the circumferential direction to prevent the can body from being concave and convex.
3 flanging. The body and the lower edge of the can are properly turned outwards so as to be crimped with the lid of the can or the bottom of the can. The part where the can body is turned out is the flanged part.
4 can body size design
2, tank bottom and tank lid
1 expansion ring. The function is to avoid the permanent deformation caused by the temperature change of the can body, to increase the mechanical strength of the can lid (bottom), to prevent the cans from breaking, to protect the sealing performance of the sealing structure, and to facilitate the identification of deteriorated foods.
2 round edges. It is a side hook formed by bending the edge of the can lid (bottom) inward so as to facilitate crimping of the can body.
3 tank cover (bottom) board size design
3, easy to open structure. The difference between the lid and the bottom of the can is that the lid has a deep burial head for fixing the can key.
1 roll open structure. The difference between the lid of the can and the bottom of the can is that the lid has a deep burial head so that the can opener can be fixed.
2 easy to open the lid structure
Second, three-piece can body manufacturing process and equipment
In the three-piece cans, if the can manufacturing process is different, they can be divided into tin solder cans, bonding cans, cans, cans, laser welding cans and fusion cans. The fusion cans are also commonly referred to as seam cans or resistors. Welding tank.
1, under the material
2, three-piece can body manufacturing process
1 Soldering can manufacturing process 2 Resistance welding can making process 3 Bonding process Can making process
Third, double curl
Double hemming is a widely used method for sealing metal can bodies and can ends (bottoms). It is not only suitable for high speed, large batch, and automatic production of cans, cans and cans, but also easy to guarantee metal cans. Hermeticity. Double curled structure
1 double curled internal structure. Including body hooks, cover hooks, splicing lengths, splice ratios, cover hook clearances, and hook clearances.
2 The outer structure of the double hemming includes the thickness of the hemming, the hemming width and the degree of burying.
2, double curling process
1 The role of the main components of the can closure machine 2 The formation process of the double hemming 3 The quality inspection and inspection method of the double hemming
4 Canning machine introduction (SBJ-120 canning machine)