Method of making thermal-insulating module

摘要

A method of making a thermal-insulating panel for use in an electric furnace. A refractory fiber mat is formed in a felting box from a suspension of discrete refractory fibers plus an inorganic bonding agent. The modules have a hot face, a cold face and a plurality of side faces. A plurality of individual ceramic supports are partially embedded in said mat and protrude outward from the hot face. The embedded portions are shaped so as to be firmly anchored within the mat, and the protruding portions are shaped to support an electrical resistance heating ribbon in the interior of the furnace. The modules are preferably formed in a special felting box having a front wall that has a plurality of cavities from which the ceramic supports extend horizontally into the main portion of the box. The layers of fibers build up upon the bottom screen in planes perpendicular to the hot face of the module.