Can seamers are the systems responsible for securing lids to their respective can bodies. The lid, also known as the “end,” is often constructed of tinplated steel for food items or aluminum for drinks, while the body can be made of metal, paperboard, or plastic.
This process results in a seam that is typically leak-proof, but its effectiveness depends on the contents of the can. The seamer creates the seam by mechanically overlapping the two layers and forming a hook.
To ensure the seam’s reliability, different parameters are continuously monitored and measured. The shape of the double seam is determined by the roll profile of the seamer and its relative position. During the seaming process, the can is held in place by the seamer chuck while the rolls rotate around it. First, the first operation roll folds the lid, then the second operation roll tightens the resulting seam.
The first operation seam is crucial for avoiding issues such as wrinkles and leaks. The shape and integrity of the seam is influenced by factors such as the shape of the rolls, their relative positions and distances, lifter height, and pressure. Any damage or malfunctions to the seamer or its tools can result in problems with the seam, including bumps, wrinkles, sharp seams, or open seams.