Abstract: Hollow bodies which are closed on one side and which are cylindrical are sorted by a sorting device. The hollow bodies have an end-side opening, a base surface situated opposite the opening and a shell surface extending between the base surface and the opening. The sorting device includes first nozzles arranged on an upper guide for conducting a first fluid flow in the direction of a lateral guide, and second nozzles arranged on a lower guide for conducting a second fluid flow in the direction of an outlet. Since the force of the fluid flow is several times greater if the fluid flow strikes a part of the shell surface of the hollow body through the end-side opening of the hollow body than if the fluid flow strikes the base surface of the hollow body from the outside, sorting of the hollow bodies is made possible.

Abstract: A device and method tests preforms that are rotationally symmetrical with respect to an axis of rotation during their conveyance along a conveyance path. The device and method tests only a statistically relevant number of produced preforms, thus allowing substantial reduction in the constructive complexity required for aligning the preforms prior to being tested. A certain number of preforms that have not been correctly aligned are allowed to continue along the conveyance path without being tested.

Abstract: Hollow bodies which are closed on one side and which are cylindrical are sorted by a sorting device. The hollow bodies have an end-side opening, a base surface situated opposite the opening and a shell surface extending between the base surface and the opening. The sorting device includes first nozzles arranged on an upper guide for conducting a first fluid flow in the direction of a lateral guide, and second nozzles arranged on a lower guide for conducting a second fluid flow in the direction of an outlet. Since the force of the fluid flow is several times greater if the fluid flow strikes a part of the shell surface of the hollow body through the end-side opening of the hollow body than if the fluid flow strikes the base surface of the hollow body from the outside, sorting of the hollow bodies is made possible.