Annealing of Degreased Reed Blades
After the process of degreasing and cleaning, reed blades have to be put through an annealing process that removes any magnetic remanence and also softens the blades that were hardened during the pressing process. Reed blades are loaded into a furnace and flushed with a special gas that help the annealing process. The surface of the reed blades are also burnt off at the high temperatures inside the furnace. The blades are then cooled over several hours inside the furnace, unloaded and then inspected for grain structure and surface smoothness. A few samples of blades are then coated and sealed into glass tubes to check for magnetic remanence levels, after which the entire batch is sent for sputtering.