Conveying system, and use of a chamber extending inwardly with respect to a plastic module in a conveying system

A conveying system, comprising:

• a conveying track;
• an endless conveyor mat designed to circulate around the conveying track and suitable for conveying products in a conveying direction;
• a drive for driving the conveyor mat;
• and
• a non-driving return guide provided at the conveying track for guiding the conveyor mat upon circulation, which return guide extends substantially transversely to the conveying direction,
• wherein the conveyor mat comprises a number of plastic modules successive in the conveying direction, extending transversely to the conveying direction, which, each module viewed in the conveying direction having front and rear sides joined by a bottom side, are each provided at their front and rear sides with hinge loops, and wherein the hinge loops of modules successive in the conveying direction cooperate and are coupled with the aid of hinge pins extending transversely to the conveying direction, wherein the plastic modules, at their side located at their bottom side when the modules are guided over the track, are provided with a track guide surface, while at least a part of the plastic modules comprise at a location of the respective track guide surface at least one chamber extending inwardly with respect to the module for being in a contact with the return guide during circulation of the module around the return guide, the chamber being formed such that contact upon circulation consists of a first line contact and a second line contact.