Heatable roller for laminators and laminator with the heatable roller

A heatable roller for laminators, the heatable roller comprising:

• a roller body including a cylindrical outer surface and defining a longitudinal axis;
• an elastic roller cover which is supported at the outer surface of the roller body;
• and
• a rod-shaped heating module which is arranged in a central axial pass-through opening of the roller body and which is connected with the roller body, torque-proof,
• wherein the roller body includes a cylindrical roller tube which defines the central axial pass-through opening in which the rod-shaped heating module is arranged,
• wherein the rod-shaped heating module includes a PTC heating rod which is enveloped by a heat-conducting electrically insulating foil,
• wherein the PTC heating rod includes a plurality of cuboid PTC heating elements that are arranged behind one another along the longitudinal axis and which are enveloped on both longitudinal sides by metal electrodes,
• wherein the metal electrodes have a trapezoid cross section so that the PTC heating rod is essentially shaped overall as a cuboid whose longitudinal edges are beveled and contact an inner surface of the roller tube.