The invention relates to a transport system for a plastics-processing joining system, to the joining system itself and to a method for operating a plastics-processing joining system. It is known to feed plastics components by means of transport systems for processing purposes to a main material transport means, for example moving film path, in order to produce bags for medical purposes. According to the invention, individually controlled movable workpiece carriers for the components are provided, or in addition to a work conveyor path for the workpiece carriers, a path for temporary parking is provided for a separate multitude of workpiece carriers.