Abstract: Apparatus for simultaneously laminating thin polymeric sheets onto at least one surface of a plurality of spacedly disposed substrates, such as photovoltaic modules. By simultaneously accommodating the lamination of a plurality of modules, the cost of the back-end fabrication of those modules is substantially reduced. The apparatus includes a plurality of diaphragms adapted to forcibly and simultaneously urge the polymeric sheets against at least one surface of each of the respective modules to be laminated. The force is preferably generated by a pump which creates a vacuum between the diaphragm and the substrate surface.