DOUBLE SEAMING - THE SAFE WAY Consumers associate cans with quality. This is an important fact to keep in mind throughout the entire process of canmaking and canning. Leaks must not occur. Effective quality control of the seaming operation keeps you on the safe side. The METOP systems are developed in close contact with the users. The instruments are therefore easy to handle and the software for the computerised systems is customised. They are designed to allow quick installation and minimal training time.