  We introduce a macroscopic model for a network of conveyor belts with various
speeds and capacities. In a different way from traffic flow models, the product
densities are forced to move with a constant velocity unless they reach a
maximal capacity and start to queue. This kind of dynamics is governed by
scalar conservation laws consisting of a discontinuous flux function. We define
appropriate coupling conditions to get well-posed solutions at intersections
and provide a detailed description of the solution. Some numerical simulations
are presented to illustrate and confirm the theoretical results for different
network configurations.
