The can flange plays a key role in the double seam process, ensuring that the seam is formed correctly.
During the sewing operation of the first roller, which is considered the most crucial part of forming a good seam, the cover is threaded onto the body flange, creating the body hook on the finished seam. This operation is determined by the roller of the first operation and the pressure of the base plate. The pressure should be sufficient to force the lid right onto the mandrel and hold the can firmly. Any deficiencies in this first operation cannot be corrected during the sewing operation of the second roller. Therefore, the correct formation of the can flange is essential for a good seal.
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basic information on seaming in canmaking
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