Sarp continuous spiral conveyor belts are the ideal system for the heat treatment of packed or unpacked products, for drying, sterilizing, pasteurizing, cooling, freezing or proofing different types of food products. The spiral is based on a coil-shape conveyor belt developed in heigh and dragged by one or more motors. Thus space occupied by the machine is reduced to the minimum and the devices for heat treatment can be placed in strategic locations to optimize the efficiency of heat exchange between air and product. Particular needs of the customer in the connections between various machineries, various departments and working sites can be easily met by our tailor-made solutions that allow the development of machineries in various shapes and sizes. Depending on the type of product treated the spiral can be placed inside an insulated room in combination with devices that enable the optimal treatment process for the product. Each solution is designed paying particular attention to energy saving and operating efficiency, while minimizing plant stoppage and maintenance needed.