The copper wire, having served its purpose, is ejected by the machine and returned to the factory for recycling. On cans intended for certain products, a protective enamel is sprayed on the welded seam inside and outside the cylinder. The cylinder must pass through an oven where the enamel is cured for a few seconds at high temperature. Most cans are formed individually, but some of the small cans start out two per cylinder. The cylinder must be divided at the parter.
Beading makes it possible to use slightly thinner tinplate.
The interior periphery of the end is coated with a latex material called seaming compound which helps form the seal. Tester rejects cans that do not have a tight seal. Click on the AnswerCan to return to the questions.