a plastic closure having a lower part attachable to a container , and a cap which is connected with the lower part by a main film hinge . a spring element engages the lower part and the cap , and also bridges an axis of rotation of the main film hinge and thus generates a snap effect . the main film hinge extends continuously through an area in which the main film hinge is bridged by the spring element . in a closed state of the plastic closure , each spring element is hidden completely within the closed closure .