Semi-automatic crimping Machine The semi-automatic crimping machine is a device equipped with a 1-inch spreading head, closing inch valves with the same quality and speed of tinplate and aluminum sheet on cans. The closure takes place by mechanical clamping of the valves (made of tinplate or aluminum). The supply of compressed air only prevents the risk of explosion in the production process. It supports containers with a diameter of Ø35-66 mm.