Below is a list of Conveyor Ovens manufacturers from Castalia, Ohio. A conveyor oven is a type of thermal processing machinery that heats a product on a conveyor belt. A wide range of industries require a means of heat treating products. In the manufacturing industry, heat treatment as an annealing, drying and melting process is very common. In the food service and food production industries, machinery that can operate on an industrial scale is required. In the case of the manufacturing industry, large batch ovens produce simultaneous, uniform application of heat for the large scale products being produced.