Method and apparatus for the end-testing of preforms

Abstract

The invention relates to a method and a device for testing the openings of identical preforms that are rotationally symmetrical about an axis of rotation and have an annular rim surrounding the opening, which has a reflective surface. The testing of the identical preforms is carried out during transport along a transport track by means of a transport device, wherein the transport track lies in a transport plane. Different types of identical preforms are transported at a uniform angle of inclination, other than 0°, between the reflective surface of the opening rim and the transport plane due to the design of the transport device.In order to detect and reliably evaluate the orifice defects of the preforms to be tested with high contrast, the reflective properties of the annular orifice rim are used for orifice testing to trigger the camera during transport.